Commit | Line | Data |
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dae5f0af | 1 | // SPDX-License-Identifier: GPL-2.0 |
923a654c | 2 | #include <linux/bitmap.h> |
d2876d08 DB |
3 | #include <linux/kernel.h> |
4 | #include <linux/module.h> | |
ff77c352 | 5 | #include <linux/interrupt.h> |
d2876d08 DB |
6 | #include <linux/irq.h> |
7 | #include <linux/spinlock.h> | |
1a989d0f | 8 | #include <linux/list.h> |
d8f388d8 DB |
9 | #include <linux/device.h> |
10 | #include <linux/err.h> | |
11 | #include <linux/debugfs.h> | |
12 | #include <linux/seq_file.h> | |
13 | #include <linux/gpio.h> | |
391c970c | 14 | #include <linux/of_gpio.h> |
ff77c352 | 15 | #include <linux/idr.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
7b199811 | 17 | #include <linux/acpi.h> |
53e7cac3 | 18 | #include <linux/gpio/driver.h> |
0a6d3158 | 19 | #include <linux/gpio/machine.h> |
c771c2f4 | 20 | #include <linux/pinctrl/consumer.h> |
3c702e99 LW |
21 | #include <linux/cdev.h> |
22 | #include <linux/fs.h> | |
23 | #include <linux/uaccess.h> | |
8b92e17e | 24 | #include <linux/compat.h> |
d7c51b47 | 25 | #include <linux/anon_inodes.h> |
953b956a | 26 | #include <linux/file.h> |
61f922db LW |
27 | #include <linux/kfifo.h> |
28 | #include <linux/poll.h> | |
29 | #include <linux/timekeeping.h> | |
3c702e99 | 30 | #include <uapi/linux/gpio.h> |
d2876d08 | 31 | |
664e3e5a MW |
32 | #include "gpiolib.h" |
33 | ||
3f397c21 UKK |
34 | #define CREATE_TRACE_POINTS |
35 | #include <trace/events/gpio.h> | |
d2876d08 | 36 | |
79a9becd | 37 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 38 | * |
79a9becd AC |
39 | * The GPIO programming interface allows for inlining speed-critical |
40 | * get/set operations for common cases, so that access to SOC-integrated | |
41 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
42 | */ |
43 | ||
44 | ||
45 | /* When debugging, extend minimal trust to callers and platform code. | |
46 | * Also emit diagnostic messages that may help initial bringup, when | |
47 | * board setup or driver bugs are most common. | |
48 | * | |
49 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
50 | */ | |
51 | #ifdef DEBUG | |
52 | #define extra_checks 1 | |
53 | #else | |
54 | #define extra_checks 0 | |
55 | #endif | |
56 | ||
ff2b1359 LW |
57 | /* Device and char device-related information */ |
58 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
59 | static dev_t gpio_devt; |
60 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
61 | static struct bus_type gpio_bus_type = { | |
62 | .name = "gpio", | |
63 | }; | |
ff2b1359 | 64 | |
3027743f LA |
65 | /* |
66 | * Number of GPIOs to use for the fast path in set array | |
67 | */ | |
68 | #define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT | |
69 | ||
d2876d08 DB |
70 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
71 | * While any GPIO is requested, its gpio_chip is not removable; | |
72 | * each GPIO's "requested" flag serves as a lock and refcount. | |
73 | */ | |
0eb4c6c2 | 74 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 75 | |
bae48da2 AC |
76 | static DEFINE_MUTEX(gpio_lookup_lock); |
77 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 78 | LIST_HEAD(gpio_devices); |
6d86750c | 79 | |
a411e81e BG |
80 | static DEFINE_MUTEX(gpio_machine_hogs_mutex); |
81 | static LIST_HEAD(gpio_machine_hogs); | |
82 | ||
6d86750c | 83 | static void gpiochip_free_hogs(struct gpio_chip *chip); |
959bc7b2 | 84 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
85 | struct lock_class_key *lock_key, |
86 | struct lock_class_key *request_key); | |
6d86750c | 87 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); |
79b804cb MW |
88 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); |
89 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); | |
6d86750c | 90 | |
159f3cd9 | 91 | static bool gpiolib_initialized; |
6d86750c | 92 | |
d2876d08 DB |
93 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
94 | { | |
d2876d08 | 95 | d->label = label; |
d2876d08 DB |
96 | } |
97 | ||
372e722e | 98 | /** |
950d55f5 TR |
99 | * gpio_to_desc - Convert a GPIO number to its descriptor |
100 | * @gpio: global GPIO number | |
101 | * | |
102 | * Returns: | |
103 | * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO | |
104 | * with the given number exists in the system. | |
372e722e | 105 | */ |
79a9becd | 106 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 107 | { |
ff2b1359 | 108 | struct gpio_device *gdev; |
14e85c0e AC |
109 | unsigned long flags; |
110 | ||
111 | spin_lock_irqsave(&gpio_lock, flags); | |
112 | ||
ff2b1359 | 113 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
114 | if (gdev->base <= gpio && |
115 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 116 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 117 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
118 | } |
119 | } | |
120 | ||
121 | spin_unlock_irqrestore(&gpio_lock, flags); | |
122 | ||
0e9a5edf AC |
123 | if (!gpio_is_valid(gpio)) |
124 | WARN(1, "invalid GPIO %d\n", gpio); | |
125 | ||
14e85c0e | 126 | return NULL; |
372e722e | 127 | } |
79a9becd | 128 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 129 | |
d468bf9e | 130 | /** |
950d55f5 TR |
131 | * gpiochip_get_desc - get the GPIO descriptor corresponding to the given |
132 | * hardware number for this chip | |
133 | * @chip: GPIO chip | |
134 | * @hwnum: hardware number of the GPIO for this chip | |
135 | * | |
136 | * Returns: | |
137 | * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists | |
138 | * in the given chip for the specified hardware number. | |
d468bf9e | 139 | */ |
bb1e88cc AC |
140 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
141 | u16 hwnum) | |
d468bf9e | 142 | { |
fdeb8e15 LW |
143 | struct gpio_device *gdev = chip->gpiodev; |
144 | ||
145 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 146 | return ERR_PTR(-EINVAL); |
d468bf9e | 147 | |
fdeb8e15 | 148 | return &gdev->descs[hwnum]; |
d468bf9e | 149 | } |
372e722e AC |
150 | |
151 | /** | |
950d55f5 TR |
152 | * desc_to_gpio - convert a GPIO descriptor to the integer namespace |
153 | * @desc: GPIO descriptor | |
154 | * | |
372e722e | 155 | * This should disappear in the future but is needed since we still |
950d55f5 TR |
156 | * use GPIO numbers for error messages and sysfs nodes. |
157 | * | |
158 | * Returns: | |
159 | * The global GPIO number for the GPIO specified by its descriptor. | |
372e722e | 160 | */ |
79a9becd | 161 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 162 | { |
fdeb8e15 | 163 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 164 | } |
79a9becd | 165 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
166 | |
167 | ||
79a9becd AC |
168 | /** |
169 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
170 | * @desc: descriptor to return the chip of | |
171 | */ | |
172 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 173 | { |
dd3b9a44 | 174 | if (!desc || !desc->gdev) |
fdeb8e15 LW |
175 | return NULL; |
176 | return desc->gdev->chip; | |
372e722e | 177 | } |
79a9becd | 178 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 179 | |
8d0aab2f AV |
180 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
181 | static int gpiochip_find_base(int ngpio) | |
182 | { | |
ff2b1359 | 183 | struct gpio_device *gdev; |
83cabe33 | 184 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 185 | |
ff2b1359 | 186 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 187 | /* found a free space? */ |
fdeb8e15 | 188 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
189 | break; |
190 | else | |
191 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 192 | base = gdev->base - ngpio; |
8d0aab2f AV |
193 | } |
194 | ||
83cabe33 | 195 | if (gpio_is_valid(base)) { |
8d0aab2f | 196 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
197 | return base; |
198 | } else { | |
199 | pr_err("%s: cannot find free range\n", __func__); | |
200 | return -ENOSPC; | |
169b6a7a | 201 | } |
169b6a7a AV |
202 | } |
203 | ||
79a9becd AC |
204 | /** |
205 | * gpiod_get_direction - return the current direction of a GPIO | |
206 | * @desc: GPIO to get the direction of | |
207 | * | |
94fc7309 | 208 | * Returns 0 for output, 1 for input, or an error code in case of error. |
79a9becd AC |
209 | * |
210 | * This function may sleep if gpiod_cansleep() is true. | |
211 | */ | |
8e53b0f1 | 212 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 | 213 | { |
d0121b85 WS |
214 | struct gpio_chip *chip; |
215 | unsigned offset; | |
216 | int status; | |
80b0a602 | 217 | |
372e722e AC |
218 | chip = gpiod_to_chip(desc); |
219 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
220 | |
221 | if (!chip->get_direction) | |
d0121b85 | 222 | return -ENOTSUPP; |
80b0a602 | 223 | |
372e722e | 224 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
225 | if (status > 0) { |
226 | /* GPIOF_DIR_IN, or other positive */ | |
227 | status = 1; | |
8e53b0f1 | 228 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
229 | } |
230 | if (status == 0) { | |
231 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 232 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
233 | } |
234 | return status; | |
235 | } | |
79a9becd | 236 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 237 | |
1a989d0f AC |
238 | /* |
239 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 240 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
241 | * |
242 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
243 | * space. | |
244 | */ | |
ff2b1359 | 245 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 246 | { |
a961f9b4 | 247 | struct gpio_device *prev, *next; |
1a989d0f | 248 | |
ff2b1359 | 249 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 250 | /* initial entry in list */ |
ff2b1359 | 251 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 252 | return 0; |
1a989d0f AC |
253 | } |
254 | ||
a961f9b4 BJZ |
255 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
256 | if (gdev->base + gdev->ngpio <= next->base) { | |
257 | /* add before first entry */ | |
258 | list_add(&gdev->list, &gpio_devices); | |
259 | return 0; | |
1a989d0f AC |
260 | } |
261 | ||
a961f9b4 BJZ |
262 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
263 | if (prev->base + prev->ngpio <= gdev->base) { | |
264 | /* add behind last entry */ | |
265 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 266 | return 0; |
1a989d0f AC |
267 | } |
268 | ||
a961f9b4 BJZ |
269 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
270 | /* at the end of the list */ | |
271 | if (&next->list == &gpio_devices) | |
272 | break; | |
1a989d0f | 273 | |
a961f9b4 BJZ |
274 | /* add between prev and next */ |
275 | if (prev->base + prev->ngpio <= gdev->base | |
276 | && gdev->base + gdev->ngpio <= next->base) { | |
277 | list_add(&gdev->list, &prev->list); | |
278 | return 0; | |
279 | } | |
280 | } | |
281 | ||
282 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
283 | return -EBUSY; | |
1a989d0f AC |
284 | } |
285 | ||
950d55f5 | 286 | /* |
f881bab0 LW |
287 | * Convert a GPIO name to its descriptor |
288 | */ | |
289 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
290 | { | |
ff2b1359 | 291 | struct gpio_device *gdev; |
f881bab0 LW |
292 | unsigned long flags; |
293 | ||
294 | spin_lock_irqsave(&gpio_lock, flags); | |
295 | ||
ff2b1359 | 296 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
297 | int i; |
298 | ||
fdeb8e15 LW |
299 | for (i = 0; i != gdev->ngpio; ++i) { |
300 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 301 | |
fdeb8e15 | 302 | if (!desc->name || !name) |
f881bab0 LW |
303 | continue; |
304 | ||
fdeb8e15 | 305 | if (!strcmp(desc->name, name)) { |
f881bab0 | 306 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 307 | return desc; |
f881bab0 LW |
308 | } |
309 | } | |
310 | } | |
311 | ||
312 | spin_unlock_irqrestore(&gpio_lock, flags); | |
313 | ||
314 | return NULL; | |
315 | } | |
316 | ||
5f3ca732 MP |
317 | /* |
318 | * Takes the names from gc->names and checks if they are all unique. If they | |
319 | * are, they are assigned to their gpio descriptors. | |
320 | * | |
ed37915c | 321 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
322 | */ |
323 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
324 | { | |
fdeb8e15 | 325 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
326 | int i; |
327 | ||
328 | if (!gc->names) | |
329 | return 0; | |
330 | ||
331 | /* First check all names if they are unique */ | |
332 | for (i = 0; i != gc->ngpio; ++i) { | |
333 | struct gpio_desc *gpio; | |
334 | ||
335 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 336 | if (gpio) |
fdeb8e15 | 337 | dev_warn(&gdev->dev, |
34ffd85d | 338 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 339 | gc->names[i]); |
5f3ca732 MP |
340 | } |
341 | ||
342 | /* Then add all names to the GPIO descriptors */ | |
343 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 344 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
345 | |
346 | return 0; | |
347 | } | |
348 | ||
e4371f6e SB |
349 | static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip) |
350 | { | |
351 | unsigned long *p; | |
352 | ||
ace56935 | 353 | p = kmalloc_array(BITS_TO_LONGS(chip->ngpio), sizeof(*p), GFP_KERNEL); |
e4371f6e SB |
354 | if (!p) |
355 | return NULL; | |
356 | ||
357 | /* Assume by default all GPIOs are valid */ | |
358 | bitmap_fill(p, chip->ngpio); | |
359 | ||
360 | return p; | |
361 | } | |
362 | ||
f8ec92a9 | 363 | static int gpiochip_alloc_valid_mask(struct gpio_chip *gpiochip) |
726cb3ba SB |
364 | { |
365 | #ifdef CONFIG_OF_GPIO | |
366 | int size; | |
367 | struct device_node *np = gpiochip->of_node; | |
368 | ||
369 | size = of_property_count_u32_elems(np, "gpio-reserved-ranges"); | |
370 | if (size > 0 && size % 2 == 0) | |
371 | gpiochip->need_valid_mask = true; | |
372 | #endif | |
373 | ||
374 | if (!gpiochip->need_valid_mask) | |
375 | return 0; | |
376 | ||
377 | gpiochip->valid_mask = gpiochip_allocate_mask(gpiochip); | |
378 | if (!gpiochip->valid_mask) | |
379 | return -ENOMEM; | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
f8ec92a9 RRD |
384 | static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip) |
385 | { | |
386 | if (gpiochip->init_valid_mask) | |
387 | return gpiochip->init_valid_mask(gpiochip); | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
726cb3ba SB |
392 | static void gpiochip_free_valid_mask(struct gpio_chip *gpiochip) |
393 | { | |
394 | kfree(gpiochip->valid_mask); | |
395 | gpiochip->valid_mask = NULL; | |
396 | } | |
397 | ||
398 | bool gpiochip_line_is_valid(const struct gpio_chip *gpiochip, | |
399 | unsigned int offset) | |
400 | { | |
401 | /* No mask means all valid */ | |
402 | if (likely(!gpiochip->valid_mask)) | |
403 | return true; | |
404 | return test_bit(offset, gpiochip->valid_mask); | |
405 | } | |
406 | EXPORT_SYMBOL_GPL(gpiochip_line_is_valid); | |
407 | ||
d7c51b47 LW |
408 | /* |
409 | * GPIO line handle management | |
410 | */ | |
411 | ||
412 | /** | |
413 | * struct linehandle_state - contains the state of a userspace handle | |
414 | * @gdev: the GPIO device the handle pertains to | |
415 | * @label: consumer label used to tag descriptors | |
416 | * @descs: the GPIO descriptors held by this handle | |
417 | * @numdescs: the number of descriptors held in the descs array | |
418 | */ | |
419 | struct linehandle_state { | |
420 | struct gpio_device *gdev; | |
421 | const char *label; | |
422 | struct gpio_desc *descs[GPIOHANDLES_MAX]; | |
423 | u32 numdescs; | |
424 | }; | |
425 | ||
e3e847c7 LPC |
426 | #define GPIOHANDLE_REQUEST_VALID_FLAGS \ |
427 | (GPIOHANDLE_REQUEST_INPUT | \ | |
428 | GPIOHANDLE_REQUEST_OUTPUT | \ | |
429 | GPIOHANDLE_REQUEST_ACTIVE_LOW | \ | |
430 | GPIOHANDLE_REQUEST_OPEN_DRAIN | \ | |
431 | GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
432 | ||
d7c51b47 LW |
433 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, |
434 | unsigned long arg) | |
435 | { | |
436 | struct linehandle_state *lh = filep->private_data; | |
437 | void __user *ip = (void __user *)arg; | |
438 | struct gpiohandle_data ghd; | |
b9762beb | 439 | DECLARE_BITMAP(vals, GPIOHANDLES_MAX); |
d7c51b47 LW |
440 | int i; |
441 | ||
442 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
2b955b34 | 443 | /* NOTE: It's ok to read values of output lines. */ |
eec1d566 LW |
444 | int ret = gpiod_get_array_value_complex(false, |
445 | true, | |
446 | lh->numdescs, | |
447 | lh->descs, | |
77588c14 | 448 | NULL, |
eec1d566 LW |
449 | vals); |
450 | if (ret) | |
451 | return ret; | |
d7c51b47 | 452 | |
3eded5d8 | 453 | memset(&ghd, 0, sizeof(ghd)); |
eec1d566 | 454 | for (i = 0; i < lh->numdescs; i++) |
b9762beb | 455 | ghd.values[i] = test_bit(i, vals); |
d7c51b47 LW |
456 | |
457 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
458 | return -EFAULT; | |
459 | ||
460 | return 0; | |
461 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { | |
e5332d54 BG |
462 | /* |
463 | * All line descriptors were created at once with the same | |
464 | * flags so just check if the first one is really output. | |
465 | */ | |
466 | if (!test_bit(FLAG_IS_OUT, &lh->descs[0]->flags)) | |
467 | return -EPERM; | |
468 | ||
d7c51b47 LW |
469 | if (copy_from_user(&ghd, ip, sizeof(ghd))) |
470 | return -EFAULT; | |
471 | ||
472 | /* Clamp all values to [0,1] */ | |
473 | for (i = 0; i < lh->numdescs; i++) | |
b9762beb | 474 | __assign_bit(i, vals, ghd.values[i]); |
d7c51b47 LW |
475 | |
476 | /* Reuse the array setting function */ | |
3027743f | 477 | return gpiod_set_array_value_complex(false, |
d7c51b47 LW |
478 | true, |
479 | lh->numdescs, | |
480 | lh->descs, | |
77588c14 | 481 | NULL, |
d7c51b47 | 482 | vals); |
d7c51b47 LW |
483 | } |
484 | return -EINVAL; | |
485 | } | |
486 | ||
487 | #ifdef CONFIG_COMPAT | |
488 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, | |
489 | unsigned long arg) | |
490 | { | |
491 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
492 | } | |
493 | #endif | |
494 | ||
495 | static int linehandle_release(struct inode *inode, struct file *filep) | |
496 | { | |
497 | struct linehandle_state *lh = filep->private_data; | |
498 | struct gpio_device *gdev = lh->gdev; | |
499 | int i; | |
500 | ||
501 | for (i = 0; i < lh->numdescs; i++) | |
502 | gpiod_free(lh->descs[i]); | |
503 | kfree(lh->label); | |
504 | kfree(lh); | |
505 | put_device(&gdev->dev); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static const struct file_operations linehandle_fileops = { | |
510 | .release = linehandle_release, | |
511 | .owner = THIS_MODULE, | |
512 | .llseek = noop_llseek, | |
513 | .unlocked_ioctl = linehandle_ioctl, | |
514 | #ifdef CONFIG_COMPAT | |
515 | .compat_ioctl = linehandle_ioctl_compat, | |
516 | #endif | |
517 | }; | |
518 | ||
519 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) | |
520 | { | |
521 | struct gpiohandle_request handlereq; | |
522 | struct linehandle_state *lh; | |
953b956a | 523 | struct file *file; |
ab3dbcf7 | 524 | int fd, i, count = 0, ret; |
418ee8e9 | 525 | u32 lflags; |
d7c51b47 LW |
526 | |
527 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) | |
528 | return -EFAULT; | |
529 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) | |
530 | return -EINVAL; | |
531 | ||
418ee8e9 BG |
532 | lflags = handlereq.flags; |
533 | ||
534 | /* Return an error if an unknown flag is set */ | |
535 | if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) | |
536 | return -EINVAL; | |
537 | ||
588fc3bc BG |
538 | /* |
539 | * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If | |
540 | * the hardware actually supports enabling both at the same time the | |
541 | * electrical result would be disastrous. | |
542 | */ | |
543 | if ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) && | |
544 | (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)) | |
545 | return -EINVAL; | |
546 | ||
609aaf6a BG |
547 | /* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */ |
548 | if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) && | |
549 | ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) || | |
550 | (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))) | |
551 | return -EINVAL; | |
552 | ||
d7c51b47 LW |
553 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); |
554 | if (!lh) | |
555 | return -ENOMEM; | |
556 | lh->gdev = gdev; | |
557 | get_device(&gdev->dev); | |
558 | ||
559 | /* Make sure this is terminated */ | |
560 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; | |
561 | if (strlen(handlereq.consumer_label)) { | |
562 | lh->label = kstrdup(handlereq.consumer_label, | |
563 | GFP_KERNEL); | |
564 | if (!lh->label) { | |
565 | ret = -ENOMEM; | |
566 | goto out_free_lh; | |
567 | } | |
568 | } | |
569 | ||
570 | /* Request each GPIO */ | |
571 | for (i = 0; i < handlereq.lines; i++) { | |
572 | u32 offset = handlereq.lineoffsets[i]; | |
d7c51b47 LW |
573 | struct gpio_desc *desc; |
574 | ||
e405f9fc LPC |
575 | if (offset >= gdev->ngpio) { |
576 | ret = -EINVAL; | |
577 | goto out_free_descs; | |
578 | } | |
579 | ||
d7c51b47 LW |
580 | desc = &gdev->descs[offset]; |
581 | ret = gpiod_request(desc, lh->label); | |
582 | if (ret) | |
583 | goto out_free_descs; | |
584 | lh->descs[i] = desc; | |
19a4fbff | 585 | count = i + 1; |
d7c51b47 LW |
586 | |
587 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
588 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
589 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
590 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
591 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
592 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
593 | ||
e10f72bf AJ |
594 | ret = gpiod_set_transitory(desc, false); |
595 | if (ret < 0) | |
596 | goto out_free_descs; | |
597 | ||
d7c51b47 LW |
598 | /* |
599 | * Lines have to be requested explicitly for input | |
600 | * or output, else the line will be treated "as is". | |
601 | */ | |
602 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
603 | int val = !!handlereq.default_values[i]; | |
604 | ||
605 | ret = gpiod_direction_output(desc, val); | |
606 | if (ret) | |
607 | goto out_free_descs; | |
608 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { | |
609 | ret = gpiod_direction_input(desc); | |
610 | if (ret) | |
611 | goto out_free_descs; | |
612 | } | |
613 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", | |
614 | offset); | |
615 | } | |
e2f608be LW |
616 | /* Let i point at the last handle */ |
617 | i--; | |
d7c51b47 LW |
618 | lh->numdescs = handlereq.lines; |
619 | ||
953b956a | 620 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
d7c51b47 LW |
621 | if (fd < 0) { |
622 | ret = fd; | |
623 | goto out_free_descs; | |
624 | } | |
625 | ||
953b956a LPC |
626 | file = anon_inode_getfile("gpio-linehandle", |
627 | &linehandle_fileops, | |
628 | lh, | |
629 | O_RDONLY | O_CLOEXEC); | |
630 | if (IS_ERR(file)) { | |
631 | ret = PTR_ERR(file); | |
632 | goto out_put_unused_fd; | |
633 | } | |
634 | ||
d7c51b47 | 635 | handlereq.fd = fd; |
d932cd49 | 636 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
953b956a LPC |
637 | /* |
638 | * fput() will trigger the release() callback, so do not go onto | |
639 | * the regular error cleanup path here. | |
640 | */ | |
641 | fput(file); | |
642 | put_unused_fd(fd); | |
643 | return -EFAULT; | |
d932cd49 | 644 | } |
d7c51b47 | 645 | |
953b956a LPC |
646 | fd_install(fd, file); |
647 | ||
d7c51b47 LW |
648 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", |
649 | lh->numdescs); | |
650 | ||
651 | return 0; | |
652 | ||
953b956a LPC |
653 | out_put_unused_fd: |
654 | put_unused_fd(fd); | |
d7c51b47 | 655 | out_free_descs: |
ab3dbcf7 | 656 | for (i = 0; i < count; i++) |
d7c51b47 LW |
657 | gpiod_free(lh->descs[i]); |
658 | kfree(lh->label); | |
659 | out_free_lh: | |
660 | kfree(lh); | |
661 | put_device(&gdev->dev); | |
662 | return ret; | |
663 | } | |
664 | ||
61f922db LW |
665 | /* |
666 | * GPIO line event management | |
667 | */ | |
668 | ||
669 | /** | |
670 | * struct lineevent_state - contains the state of a userspace event | |
671 | * @gdev: the GPIO device the event pertains to | |
672 | * @label: consumer label used to tag descriptors | |
673 | * @desc: the GPIO descriptor held by this event | |
674 | * @eflags: the event flags this line was requested with | |
675 | * @irq: the interrupt that trigger in response to events on this GPIO | |
676 | * @wait: wait queue that handles blocking reads of events | |
677 | * @events: KFIFO for the GPIO events | |
678 | * @read_lock: mutex lock to protect reads from colliding with adding | |
679 | * new events to the FIFO | |
d58f2bf2 LW |
680 | * @timestamp: cache for the timestamp storing it between hardirq |
681 | * and IRQ thread, used to bring the timestamp close to the actual | |
682 | * event | |
61f922db LW |
683 | */ |
684 | struct lineevent_state { | |
685 | struct gpio_device *gdev; | |
686 | const char *label; | |
687 | struct gpio_desc *desc; | |
688 | u32 eflags; | |
689 | int irq; | |
690 | wait_queue_head_t wait; | |
691 | DECLARE_KFIFO(events, struct gpioevent_data, 16); | |
692 | struct mutex read_lock; | |
d58f2bf2 | 693 | u64 timestamp; |
61f922db LW |
694 | }; |
695 | ||
ac7dbb99 LPC |
696 | #define GPIOEVENT_REQUEST_VALID_FLAGS \ |
697 | (GPIOEVENT_REQUEST_RISING_EDGE | \ | |
698 | GPIOEVENT_REQUEST_FALLING_EDGE) | |
699 | ||
afc9a42b | 700 | static __poll_t lineevent_poll(struct file *filep, |
61f922db LW |
701 | struct poll_table_struct *wait) |
702 | { | |
703 | struct lineevent_state *le = filep->private_data; | |
afc9a42b | 704 | __poll_t events = 0; |
61f922db LW |
705 | |
706 | poll_wait(filep, &le->wait, wait); | |
707 | ||
708 | if (!kfifo_is_empty(&le->events)) | |
a9a08845 | 709 | events = EPOLLIN | EPOLLRDNORM; |
61f922db LW |
710 | |
711 | return events; | |
712 | } | |
713 | ||
714 | ||
715 | static ssize_t lineevent_read(struct file *filep, | |
716 | char __user *buf, | |
717 | size_t count, | |
718 | loff_t *f_ps) | |
719 | { | |
720 | struct lineevent_state *le = filep->private_data; | |
721 | unsigned int copied; | |
722 | int ret; | |
723 | ||
724 | if (count < sizeof(struct gpioevent_data)) | |
725 | return -EINVAL; | |
726 | ||
727 | do { | |
728 | if (kfifo_is_empty(&le->events)) { | |
729 | if (filep->f_flags & O_NONBLOCK) | |
730 | return -EAGAIN; | |
731 | ||
732 | ret = wait_event_interruptible(le->wait, | |
733 | !kfifo_is_empty(&le->events)); | |
734 | if (ret) | |
735 | return ret; | |
736 | } | |
737 | ||
738 | if (mutex_lock_interruptible(&le->read_lock)) | |
739 | return -ERESTARTSYS; | |
740 | ret = kfifo_to_user(&le->events, buf, count, &copied); | |
741 | mutex_unlock(&le->read_lock); | |
742 | ||
743 | if (ret) | |
744 | return ret; | |
745 | ||
746 | /* | |
747 | * If we couldn't read anything from the fifo (a different | |
748 | * thread might have been faster) we either return -EAGAIN if | |
749 | * the file descriptor is non-blocking, otherwise we go back to | |
750 | * sleep and wait for more data to arrive. | |
751 | */ | |
752 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
753 | return -EAGAIN; | |
754 | ||
755 | } while (copied == 0); | |
756 | ||
757 | return copied; | |
758 | } | |
759 | ||
760 | static int lineevent_release(struct inode *inode, struct file *filep) | |
761 | { | |
762 | struct lineevent_state *le = filep->private_data; | |
763 | struct gpio_device *gdev = le->gdev; | |
764 | ||
765 | free_irq(le->irq, le); | |
766 | gpiod_free(le->desc); | |
767 | kfree(le->label); | |
768 | kfree(le); | |
769 | put_device(&gdev->dev); | |
770 | return 0; | |
771 | } | |
772 | ||
773 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, | |
774 | unsigned long arg) | |
775 | { | |
776 | struct lineevent_state *le = filep->private_data; | |
777 | void __user *ip = (void __user *)arg; | |
778 | struct gpiohandle_data ghd; | |
779 | ||
780 | /* | |
781 | * We can get the value for an event line but not set it, | |
782 | * because it is input by definition. | |
783 | */ | |
784 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
785 | int val; | |
786 | ||
d82aa4a8 LPC |
787 | memset(&ghd, 0, sizeof(ghd)); |
788 | ||
61f922db LW |
789 | val = gpiod_get_value_cansleep(le->desc); |
790 | if (val < 0) | |
791 | return val; | |
792 | ghd.values[0] = val; | |
793 | ||
794 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
795 | return -EFAULT; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | return -EINVAL; | |
800 | } | |
801 | ||
802 | #ifdef CONFIG_COMPAT | |
803 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, | |
804 | unsigned long arg) | |
805 | { | |
806 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
807 | } | |
808 | #endif | |
809 | ||
810 | static const struct file_operations lineevent_fileops = { | |
811 | .release = lineevent_release, | |
812 | .read = lineevent_read, | |
813 | .poll = lineevent_poll, | |
814 | .owner = THIS_MODULE, | |
815 | .llseek = noop_llseek, | |
816 | .unlocked_ioctl = lineevent_ioctl, | |
817 | #ifdef CONFIG_COMPAT | |
818 | .compat_ioctl = lineevent_ioctl_compat, | |
819 | #endif | |
820 | }; | |
821 | ||
33265b17 | 822 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
61f922db LW |
823 | { |
824 | struct lineevent_state *le = p; | |
825 | struct gpioevent_data ge; | |
fa38869b | 826 | int ret; |
61f922db | 827 | |
24bd3efc LW |
828 | /* Do not leak kernel stack to userspace */ |
829 | memset(&ge, 0, sizeof(ge)); | |
830 | ||
1033be58 BG |
831 | /* |
832 | * We may be running from a nested threaded interrupt in which case | |
833 | * we didn't get the timestamp from lineevent_irq_handler(). | |
834 | */ | |
835 | if (!le->timestamp) | |
836 | ge.timestamp = ktime_get_real_ns(); | |
837 | else | |
838 | ge.timestamp = le->timestamp; | |
61f922db | 839 | |
ad537b82 BG |
840 | if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE |
841 | && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { | |
fa38869b | 842 | int level = gpiod_get_value_cansleep(le->desc); |
61f922db LW |
843 | if (level) |
844 | /* Emit low-to-high event */ | |
845 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
846 | else | |
847 | /* Emit high-to-low event */ | |
848 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
fa38869b | 849 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) { |
61f922db LW |
850 | /* Emit low-to-high event */ |
851 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
fa38869b | 852 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { |
61f922db LW |
853 | /* Emit high-to-low event */ |
854 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
bc0207a5 AB |
855 | } else { |
856 | return IRQ_NONE; | |
61f922db LW |
857 | } |
858 | ||
859 | ret = kfifo_put(&le->events, ge); | |
860 | if (ret != 0) | |
a9a08845 | 861 | wake_up_poll(&le->wait, EPOLLIN); |
61f922db LW |
862 | |
863 | return IRQ_HANDLED; | |
864 | } | |
865 | ||
d58f2bf2 LW |
866 | static irqreturn_t lineevent_irq_handler(int irq, void *p) |
867 | { | |
868 | struct lineevent_state *le = p; | |
869 | ||
870 | /* | |
871 | * Just store the timestamp in hardirq context so we get it as | |
872 | * close in time as possible to the actual event. | |
873 | */ | |
874 | le->timestamp = ktime_get_real_ns(); | |
875 | ||
876 | return IRQ_WAKE_THREAD; | |
877 | } | |
878 | ||
61f922db LW |
879 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) |
880 | { | |
881 | struct gpioevent_request eventreq; | |
882 | struct lineevent_state *le; | |
883 | struct gpio_desc *desc; | |
953b956a | 884 | struct file *file; |
61f922db LW |
885 | u32 offset; |
886 | u32 lflags; | |
887 | u32 eflags; | |
888 | int fd; | |
889 | int ret; | |
890 | int irqflags = 0; | |
891 | ||
892 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) | |
893 | return -EFAULT; | |
894 | ||
895 | le = kzalloc(sizeof(*le), GFP_KERNEL); | |
896 | if (!le) | |
897 | return -ENOMEM; | |
898 | le->gdev = gdev; | |
899 | get_device(&gdev->dev); | |
900 | ||
901 | /* Make sure this is terminated */ | |
902 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; | |
903 | if (strlen(eventreq.consumer_label)) { | |
904 | le->label = kstrdup(eventreq.consumer_label, | |
905 | GFP_KERNEL); | |
906 | if (!le->label) { | |
907 | ret = -ENOMEM; | |
908 | goto out_free_le; | |
909 | } | |
910 | } | |
911 | ||
912 | offset = eventreq.lineoffset; | |
913 | lflags = eventreq.handleflags; | |
914 | eflags = eventreq.eventflags; | |
915 | ||
b8b0e3d3 LPC |
916 | if (offset >= gdev->ngpio) { |
917 | ret = -EINVAL; | |
918 | goto out_free_label; | |
919 | } | |
920 | ||
ac7dbb99 LPC |
921 | /* Return an error if a unknown flag is set */ |
922 | if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || | |
923 | (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) { | |
924 | ret = -EINVAL; | |
925 | goto out_free_label; | |
926 | } | |
927 | ||
61f922db LW |
928 | /* This is just wrong: we don't look for events on output lines */ |
929 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
930 | ret = -EINVAL; | |
931 | goto out_free_label; | |
932 | } | |
933 | ||
934 | desc = &gdev->descs[offset]; | |
935 | ret = gpiod_request(desc, le->label); | |
936 | if (ret) | |
f001cc35 | 937 | goto out_free_label; |
61f922db LW |
938 | le->desc = desc; |
939 | le->eflags = eflags; | |
940 | ||
941 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
942 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
943 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
944 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
945 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
946 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
947 | ||
948 | ret = gpiod_direction_input(desc); | |
949 | if (ret) | |
950 | goto out_free_desc; | |
951 | ||
952 | le->irq = gpiod_to_irq(desc); | |
953 | if (le->irq <= 0) { | |
954 | ret = -ENODEV; | |
955 | goto out_free_desc; | |
956 | } | |
957 | ||
958 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
223ecaf1 MW |
959 | irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? |
960 | IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING; | |
61f922db | 961 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) |
223ecaf1 MW |
962 | irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? |
963 | IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING; | |
61f922db | 964 | irqflags |= IRQF_ONESHOT; |
61f922db LW |
965 | |
966 | INIT_KFIFO(le->events); | |
967 | init_waitqueue_head(&le->wait); | |
968 | mutex_init(&le->read_lock); | |
969 | ||
970 | /* Request a thread to read the events */ | |
971 | ret = request_threaded_irq(le->irq, | |
d58f2bf2 | 972 | lineevent_irq_handler, |
61f922db LW |
973 | lineevent_irq_thread, |
974 | irqflags, | |
975 | le->label, | |
976 | le); | |
977 | if (ret) | |
978 | goto out_free_desc; | |
979 | ||
953b956a | 980 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
61f922db LW |
981 | if (fd < 0) { |
982 | ret = fd; | |
983 | goto out_free_irq; | |
984 | } | |
985 | ||
953b956a LPC |
986 | file = anon_inode_getfile("gpio-event", |
987 | &lineevent_fileops, | |
988 | le, | |
989 | O_RDONLY | O_CLOEXEC); | |
990 | if (IS_ERR(file)) { | |
991 | ret = PTR_ERR(file); | |
992 | goto out_put_unused_fd; | |
993 | } | |
994 | ||
61f922db | 995 | eventreq.fd = fd; |
d932cd49 | 996 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
953b956a LPC |
997 | /* |
998 | * fput() will trigger the release() callback, so do not go onto | |
999 | * the regular error cleanup path here. | |
1000 | */ | |
1001 | fput(file); | |
1002 | put_unused_fd(fd); | |
1003 | return -EFAULT; | |
d932cd49 | 1004 | } |
61f922db | 1005 | |
953b956a LPC |
1006 | fd_install(fd, file); |
1007 | ||
61f922db LW |
1008 | return 0; |
1009 | ||
953b956a LPC |
1010 | out_put_unused_fd: |
1011 | put_unused_fd(fd); | |
61f922db LW |
1012 | out_free_irq: |
1013 | free_irq(le->irq, le); | |
1014 | out_free_desc: | |
1015 | gpiod_free(le->desc); | |
1016 | out_free_label: | |
1017 | kfree(le->label); | |
1018 | out_free_le: | |
1019 | kfree(le); | |
1020 | put_device(&gdev->dev); | |
1021 | return ret; | |
1022 | } | |
1023 | ||
950d55f5 | 1024 | /* |
3c702e99 LW |
1025 | * gpio_ioctl() - ioctl handler for the GPIO chardev |
1026 | */ | |
1027 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1028 | { | |
1029 | struct gpio_device *gdev = filp->private_data; | |
1030 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 1031 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
1032 | |
1033 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
1034 | if (!chip) | |
1035 | return -ENODEV; | |
1036 | ||
521a2ad6 | 1037 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 1038 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
1039 | struct gpiochip_info chipinfo; |
1040 | ||
0f4bbb23 LPC |
1041 | memset(&chipinfo, 0, sizeof(chipinfo)); |
1042 | ||
3c702e99 LW |
1043 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
1044 | sizeof(chipinfo.name)); | |
1045 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
1046 | strncpy(chipinfo.label, gdev->label, |
1047 | sizeof(chipinfo.label)); | |
1048 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 1049 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
1050 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
1051 | return -EFAULT; | |
1052 | return 0; | |
521a2ad6 LW |
1053 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
1054 | struct gpioline_info lineinfo; | |
1055 | struct gpio_desc *desc; | |
1056 | ||
1057 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
1058 | return -EFAULT; | |
1f1cc456 | 1059 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
1060 | return -EINVAL; |
1061 | ||
1062 | desc = &gdev->descs[lineinfo.line_offset]; | |
1063 | if (desc->name) { | |
1064 | strncpy(lineinfo.name, desc->name, | |
1065 | sizeof(lineinfo.name)); | |
1066 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
1067 | } else { | |
1068 | lineinfo.name[0] = '\0'; | |
1069 | } | |
1070 | if (desc->label) { | |
214338e3 LW |
1071 | strncpy(lineinfo.consumer, desc->label, |
1072 | sizeof(lineinfo.consumer)); | |
1073 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 1074 | } else { |
214338e3 | 1075 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
1076 | } |
1077 | ||
1078 | /* | |
1079 | * Userspace only need to know that the kernel is using | |
1080 | * this GPIO so it can't use it. | |
1081 | */ | |
1082 | lineinfo.flags = 0; | |
9d8cc89c LW |
1083 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
1084 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
1085 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
1086 | test_bit(FLAG_EXPORT, &desc->flags) || | |
1087 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 1088 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 1089 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 1090 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 1091 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 1092 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 1093 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
2c60e6b5 BG |
1094 | lineinfo.flags |= (GPIOLINE_FLAG_OPEN_DRAIN | |
1095 | GPIOLINE_FLAG_IS_OUT); | |
9d8cc89c | 1096 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
2c60e6b5 BG |
1097 | lineinfo.flags |= (GPIOLINE_FLAG_OPEN_SOURCE | |
1098 | GPIOLINE_FLAG_IS_OUT); | |
521a2ad6 LW |
1099 | |
1100 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
1101 | return -EFAULT; | |
1102 | return 0; | |
d7c51b47 LW |
1103 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
1104 | return linehandle_create(gdev, ip); | |
61f922db LW |
1105 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
1106 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
1107 | } |
1108 | return -EINVAL; | |
1109 | } | |
1110 | ||
8b92e17e LW |
1111 | #ifdef CONFIG_COMPAT |
1112 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
1113 | unsigned long arg) | |
1114 | { | |
1115 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1116 | } | |
1117 | #endif | |
1118 | ||
3c702e99 LW |
1119 | /** |
1120 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
1121 | * @inode: inode for this chardev | |
1122 | * @filp: file struct for storing private data | |
1123 | * Returns 0 on success | |
1124 | */ | |
1125 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
1126 | { | |
1127 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1128 | struct gpio_device, chrdev); | |
1129 | ||
1130 | /* Fail on open if the backing gpiochip is gone */ | |
fb505747 | 1131 | if (!gdev->chip) |
3c702e99 LW |
1132 | return -ENODEV; |
1133 | get_device(&gdev->dev); | |
1134 | filp->private_data = gdev; | |
f4e81c52 LPC |
1135 | |
1136 | return nonseekable_open(inode, filp); | |
3c702e99 LW |
1137 | } |
1138 | ||
1139 | /** | |
1140 | * gpio_chrdev_release() - close chardev after ioctl operations | |
1141 | * @inode: inode for this chardev | |
1142 | * @filp: file struct for storing private data | |
1143 | * Returns 0 on success | |
1144 | */ | |
1145 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
1146 | { | |
1147 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1148 | struct gpio_device, chrdev); | |
1149 | ||
3c702e99 LW |
1150 | put_device(&gdev->dev); |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | ||
1155 | static const struct file_operations gpio_fileops = { | |
1156 | .release = gpio_chrdev_release, | |
1157 | .open = gpio_chrdev_open, | |
1158 | .owner = THIS_MODULE, | |
f4e81c52 | 1159 | .llseek = no_llseek, |
3c702e99 | 1160 | .unlocked_ioctl = gpio_ioctl, |
8b92e17e LW |
1161 | #ifdef CONFIG_COMPAT |
1162 | .compat_ioctl = gpio_ioctl_compat, | |
1163 | #endif | |
3c702e99 LW |
1164 | }; |
1165 | ||
ff2b1359 LW |
1166 | static void gpiodevice_release(struct device *dev) |
1167 | { | |
1168 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
1169 | ||
1170 | list_del(&gdev->list); | |
1171 | ida_simple_remove(&gpio_ida, gdev->id); | |
fcf273e5 | 1172 | kfree_const(gdev->label); |
476e2fc5 | 1173 | kfree(gdev->descs); |
9efd9e69 | 1174 | kfree(gdev); |
ff2b1359 LW |
1175 | } |
1176 | ||
159f3cd9 GR |
1177 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
1178 | { | |
1179 | int status; | |
1180 | ||
1181 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
1182 | gdev->chrdev.owner = THIS_MODULE; | |
159f3cd9 | 1183 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); |
111379dc LG |
1184 | |
1185 | status = cdev_device_add(&gdev->chrdev, &gdev->dev); | |
159f3cd9 | 1186 | if (status) |
111379dc LG |
1187 | return status; |
1188 | ||
1189 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
1190 | MAJOR(gpio_devt), gdev->id); | |
159f3cd9 GR |
1191 | |
1192 | status = gpiochip_sysfs_register(gdev); | |
1193 | if (status) | |
1194 | goto err_remove_device; | |
1195 | ||
1196 | /* From this point, the .release() function cleans up gpio_device */ | |
1197 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
1198 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
1199 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
1200 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
1201 | ||
1202 | return 0; | |
1203 | ||
1204 | err_remove_device: | |
111379dc | 1205 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
159f3cd9 GR |
1206 | return status; |
1207 | } | |
1208 | ||
a411e81e BG |
1209 | static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog) |
1210 | { | |
1211 | struct gpio_desc *desc; | |
1212 | int rv; | |
1213 | ||
1214 | desc = gpiochip_get_desc(chip, hog->chip_hwnum); | |
1215 | if (IS_ERR(desc)) { | |
1216 | pr_err("%s: unable to get GPIO desc: %ld\n", | |
1217 | __func__, PTR_ERR(desc)); | |
1218 | return; | |
1219 | } | |
1220 | ||
ba3efdff | 1221 | if (test_bit(FLAG_IS_HOGGED, &desc->flags)) |
a411e81e BG |
1222 | return; |
1223 | ||
1224 | rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags); | |
1225 | if (rv) | |
1226 | pr_err("%s: unable to hog GPIO line (%s:%u): %d\n", | |
1227 | __func__, chip->label, hog->chip_hwnum, rv); | |
1228 | } | |
1229 | ||
1230 | static void machine_gpiochip_add(struct gpio_chip *chip) | |
1231 | { | |
1232 | struct gpiod_hog *hog; | |
1233 | ||
1234 | mutex_lock(&gpio_machine_hogs_mutex); | |
1235 | ||
1236 | list_for_each_entry(hog, &gpio_machine_hogs, list) { | |
1237 | if (!strcmp(chip->label, hog->chip_label)) | |
1238 | gpiochip_machine_hog(chip, hog); | |
1239 | } | |
1240 | ||
1241 | mutex_unlock(&gpio_machine_hogs_mutex); | |
1242 | } | |
1243 | ||
159f3cd9 GR |
1244 | static void gpiochip_setup_devs(void) |
1245 | { | |
1246 | struct gpio_device *gdev; | |
1247 | int err; | |
1248 | ||
1249 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1250 | err = gpiochip_setup_dev(gdev); | |
1251 | if (err) | |
1252 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1253 | dev_name(&gdev->dev), err); | |
1254 | } | |
1255 | } | |
1256 | ||
959bc7b2 | 1257 | int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, |
39c3fd58 AL |
1258 | struct lock_class_key *lock_key, |
1259 | struct lock_class_key *request_key) | |
d2876d08 DB |
1260 | { |
1261 | unsigned long flags; | |
1262 | int status = 0; | |
ff2b1359 | 1263 | unsigned i; |
8d0aab2f | 1264 | int base = chip->base; |
ff2b1359 | 1265 | struct gpio_device *gdev; |
d2876d08 | 1266 | |
ff2b1359 LW |
1267 | /* |
1268 | * First: allocate and populate the internal stat container, and | |
1269 | * set up the struct device. | |
1270 | */ | |
969f07b4 | 1271 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1272 | if (!gdev) |
14e85c0e | 1273 | return -ENOMEM; |
3c702e99 | 1274 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1275 | gdev->chip = chip; |
1276 | chip->gpiodev = gdev; | |
1277 | if (chip->parent) { | |
1278 | gdev->dev.parent = chip->parent; | |
1279 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1280 | } |
1281 | ||
ff2b1359 LW |
1282 | #ifdef CONFIG_OF_GPIO |
1283 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1284 | if (chip->of_node) |
1285 | gdev->dev.of_node = chip->of_node; | |
6ff04974 BD |
1286 | else |
1287 | chip->of_node = gdev->dev.of_node; | |
ff2b1359 | 1288 | #endif |
acc6e331 | 1289 | |
ff2b1359 LW |
1290 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1291 | if (gdev->id < 0) { | |
1292 | status = gdev->id; | |
1293 | goto err_free_gdev; | |
1294 | } | |
1295 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1296 | device_initialize(&gdev->dev); | |
1297 | dev_set_drvdata(&gdev->dev, gdev); | |
1298 | if (chip->parent && chip->parent->driver) | |
1299 | gdev->owner = chip->parent->driver->owner; | |
1300 | else if (chip->owner) | |
1301 | /* TODO: remove chip->owner */ | |
1302 | gdev->owner = chip->owner; | |
1303 | else | |
1304 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1305 | |
476e2fc5 | 1306 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1307 | if (!gdev->descs) { |
ff2b1359 | 1308 | status = -ENOMEM; |
a05a1404 | 1309 | goto err_free_ida; |
ff2b1359 LW |
1310 | } |
1311 | ||
5ed41cc4 BJZ |
1312 | if (chip->ngpio == 0) { |
1313 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1314 | status = -EINVAL; |
159f3cd9 | 1315 | goto err_free_descs; |
5ed41cc4 | 1316 | } |
df4878e9 | 1317 | |
3027743f LA |
1318 | if (chip->ngpio > FASTPATH_NGPIO) |
1319 | chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n", | |
1320 | chip->ngpio, FASTPATH_NGPIO); | |
1321 | ||
fcf273e5 | 1322 | gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL); |
df4878e9 LW |
1323 | if (!gdev->label) { |
1324 | status = -ENOMEM; | |
476e2fc5 | 1325 | goto err_free_descs; |
df4878e9 LW |
1326 | } |
1327 | ||
fdeb8e15 | 1328 | gdev->ngpio = chip->ngpio; |
43c54eca | 1329 | gdev->data = data; |
5ed41cc4 | 1330 | |
d2876d08 DB |
1331 | spin_lock_irqsave(&gpio_lock, flags); |
1332 | ||
fdeb8e15 LW |
1333 | /* |
1334 | * TODO: this allocates a Linux GPIO number base in the global | |
1335 | * GPIO numberspace for this chip. In the long run we want to | |
1336 | * get *rid* of this numberspace and use only descriptors, but | |
1337 | * it may be a pipe dream. It will not happen before we get rid | |
1338 | * of the sysfs interface anyways. | |
1339 | */ | |
8d0aab2f AV |
1340 | if (base < 0) { |
1341 | base = gpiochip_find_base(chip->ngpio); | |
1342 | if (base < 0) { | |
1343 | status = base; | |
225fce83 | 1344 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1345 | goto err_free_label; |
8d0aab2f | 1346 | } |
fdeb8e15 LW |
1347 | /* |
1348 | * TODO: it should not be necessary to reflect the assigned | |
1349 | * base outside of the GPIO subsystem. Go over drivers and | |
1350 | * see if anyone makes use of this, else drop this and assign | |
1351 | * a poison instead. | |
1352 | */ | |
8d0aab2f AV |
1353 | chip->base = base; |
1354 | } | |
fdeb8e15 | 1355 | gdev->base = base; |
8d0aab2f | 1356 | |
ff2b1359 | 1357 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1358 | if (status) { |
1359 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1360 | goto err_free_label; |
05aa5203 | 1361 | } |
1a989d0f | 1362 | |
545ebd9a LW |
1363 | spin_unlock_irqrestore(&gpio_lock, flags); |
1364 | ||
767cd17a RRD |
1365 | for (i = 0; i < chip->ngpio; i++) |
1366 | gdev->descs[i].gdev = gdev; | |
14e85c0e | 1367 | |
f23f1516 | 1368 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1369 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1370 | #endif |
1371 | ||
5f3ca732 MP |
1372 | status = gpiochip_set_desc_names(chip); |
1373 | if (status) | |
1374 | goto err_remove_from_list; | |
1375 | ||
79b804cb MW |
1376 | status = gpiochip_irqchip_init_valid_mask(chip); |
1377 | if (status) | |
1378 | goto err_remove_from_list; | |
1379 | ||
f8ec92a9 | 1380 | status = gpiochip_alloc_valid_mask(chip); |
726cb3ba SB |
1381 | if (status) |
1382 | goto err_remove_irqchip_mask; | |
1383 | ||
39c3fd58 | 1384 | status = gpiochip_add_irqchip(chip, lock_key, request_key); |
e0d89728 | 1385 | if (status) |
35779890 | 1386 | goto err_free_gpiochip_mask; |
e0d89728 | 1387 | |
28355f81 TV |
1388 | status = of_gpiochip_add(chip); |
1389 | if (status) | |
1390 | goto err_remove_chip; | |
1391 | ||
f8ec92a9 RRD |
1392 | status = gpiochip_init_valid_mask(chip); |
1393 | if (status) | |
35779890 | 1394 | goto err_remove_of_chip; |
f8ec92a9 | 1395 | |
3edfb7bd RRD |
1396 | for (i = 0; i < chip->ngpio; i++) { |
1397 | struct gpio_desc *desc = &gdev->descs[i]; | |
1398 | ||
d95da993 CP |
1399 | if (chip->get_direction && gpiochip_line_is_valid(chip, i)) { |
1400 | if (!chip->get_direction(chip, i)) | |
1401 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1402 | else | |
1403 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
1404 | } else { | |
1405 | if (!chip->direction_input) | |
1406 | set_bit(FLAG_IS_OUT, &desc->flags); | |
1407 | else | |
1408 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
1409 | } | |
3edfb7bd RRD |
1410 | } |
1411 | ||
664e3e5a | 1412 | acpi_gpiochip_add(chip); |
391c970c | 1413 | |
a411e81e BG |
1414 | machine_gpiochip_add(chip); |
1415 | ||
3c702e99 LW |
1416 | /* |
1417 | * By first adding the chardev, and then adding the device, | |
1418 | * we get a device node entry in sysfs under | |
1419 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1420 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1421 | * We can do this only if gpiolib has been initialized. |
1422 | * Otherwise, defer until later. | |
3c702e99 | 1423 | */ |
159f3cd9 GR |
1424 | if (gpiolib_initialized) { |
1425 | status = gpiochip_setup_dev(gdev); | |
1426 | if (status) | |
35779890 | 1427 | goto err_remove_acpi_chip; |
159f3cd9 | 1428 | } |
cedb1881 | 1429 | return 0; |
3bae4811 | 1430 | |
35779890 | 1431 | err_remove_acpi_chip: |
225fce83 | 1432 | acpi_gpiochip_remove(chip); |
35779890 | 1433 | err_remove_of_chip: |
6d86750c | 1434 | gpiochip_free_hogs(chip); |
225fce83 | 1435 | of_gpiochip_remove(chip); |
35779890 GU |
1436 | err_remove_chip: |
1437 | gpiochip_irqchip_remove(chip); | |
1438 | err_free_gpiochip_mask: | |
726cb3ba SB |
1439 | gpiochip_free_valid_mask(chip); |
1440 | err_remove_irqchip_mask: | |
79b804cb | 1441 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1442 | err_remove_from_list: |
225fce83 | 1443 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1444 | list_del(&gdev->list); |
3bae4811 | 1445 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1446 | err_free_label: |
fcf273e5 | 1447 | kfree_const(gdev->label); |
476e2fc5 GR |
1448 | err_free_descs: |
1449 | kfree(gdev->descs); | |
a05a1404 | 1450 | err_free_ida: |
ff2b1359 | 1451 | ida_simple_remove(&gpio_ida, gdev->id); |
a05a1404 | 1452 | err_free_gdev: |
d2876d08 | 1453 | /* failures here can mean systems won't boot... */ |
1777fc97 | 1454 | pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__, |
fdeb8e15 | 1455 | gdev->base, gdev->base + gdev->ngpio - 1, |
1777fc97 | 1456 | chip->label ? : "generic", status); |
fdeb8e15 | 1457 | kfree(gdev); |
d2876d08 DB |
1458 | return status; |
1459 | } | |
959bc7b2 | 1460 | EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key); |
d2876d08 | 1461 | |
43c54eca LW |
1462 | /** |
1463 | * gpiochip_get_data() - get per-subdriver data for the chip | |
950d55f5 TR |
1464 | * @chip: GPIO chip |
1465 | * | |
1466 | * Returns: | |
1467 | * The per-subdriver data for the chip. | |
43c54eca LW |
1468 | */ |
1469 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1470 | { | |
1471 | return chip->gpiodev->data; | |
1472 | } | |
1473 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1474 | ||
d2876d08 DB |
1475 | /** |
1476 | * gpiochip_remove() - unregister a gpio_chip | |
1477 | * @chip: the chip to unregister | |
1478 | * | |
1479 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1480 | */ | |
e1db1706 | 1481 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1482 | { |
ff2b1359 | 1483 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1484 | struct gpio_desc *desc; |
d2876d08 | 1485 | unsigned long flags; |
1c3cdb18 | 1486 | unsigned i; |
fab28b89 | 1487 | bool requested = false; |
d2876d08 | 1488 | |
ff2b1359 | 1489 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1490 | gpiochip_sysfs_unregister(gdev); |
5018ada6 | 1491 | gpiochip_free_hogs(chip); |
bd203bd5 BJZ |
1492 | /* Numb the device, cancelling all outstanding operations */ |
1493 | gdev->chip = NULL; | |
00acc3dc | 1494 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1495 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1496 | gpiochip_remove_pin_ranges(chip); |
391c970c | 1497 | of_gpiochip_remove(chip); |
726cb3ba | 1498 | gpiochip_free_valid_mask(chip); |
43c54eca LW |
1499 | /* |
1500 | * We accept no more calls into the driver from this point, so | |
1501 | * NULL the driver data pointer | |
1502 | */ | |
1503 | gdev->data = NULL; | |
391c970c | 1504 | |
6798acaa | 1505 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1506 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1507 | desc = &gdev->descs[i]; |
fab28b89 JH |
1508 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1509 | requested = true; | |
d2876d08 | 1510 | } |
d2876d08 | 1511 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1512 | |
fab28b89 | 1513 | if (requested) |
fdeb8e15 | 1514 | dev_crit(&gdev->dev, |
58383c78 | 1515 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1516 | |
ff2b1359 LW |
1517 | /* |
1518 | * The gpiochip side puts its use of the device to rest here: | |
1519 | * if there are no userspace clients, the chardev and device will | |
1520 | * be removed, else it will be dangling until the last user is | |
1521 | * gone. | |
1522 | */ | |
111379dc | 1523 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
ff2b1359 | 1524 | put_device(&gdev->dev); |
d2876d08 DB |
1525 | } |
1526 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1527 | ||
0cf3292c LD |
1528 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1529 | { | |
1530 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1531 | ||
1532 | gpiochip_remove(chip); | |
1533 | } | |
1534 | ||
0cf3292c | 1535 | /** |
689fd02e | 1536 | * devm_gpiochip_add_data() - Resource manager gpiochip_add_data() |
3925b90f | 1537 | * @dev: pointer to the device that gpio_chip belongs to. |
0cf3292c | 1538 | * @chip: the chip to register, with chip->base initialized |
950d55f5 | 1539 | * @data: driver-private data associated with this chip |
0cf3292c | 1540 | * |
950d55f5 | 1541 | * Context: potentially before irqs will work |
0cf3292c LD |
1542 | * |
1543 | * The gpio chip automatically be released when the device is unbound. | |
950d55f5 TR |
1544 | * |
1545 | * Returns: | |
1546 | * A negative errno if the chip can't be registered, such as because the | |
1547 | * chip->base is invalid or already associated with a different chip. | |
1548 | * Otherwise it returns zero as a success code. | |
0cf3292c LD |
1549 | */ |
1550 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1551 | void *data) | |
1552 | { | |
1553 | struct gpio_chip **ptr; | |
1554 | int ret; | |
1555 | ||
1556 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1557 | GFP_KERNEL); | |
1558 | if (!ptr) | |
1559 | return -ENOMEM; | |
1560 | ||
1561 | ret = gpiochip_add_data(chip, data); | |
1562 | if (ret < 0) { | |
1563 | devres_free(ptr); | |
1564 | return ret; | |
1565 | } | |
1566 | ||
1567 | *ptr = chip; | |
1568 | devres_add(dev, ptr); | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1573 | ||
594fa265 GL |
1574 | /** |
1575 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1576 | * @data: data to pass to match function | |
950d55f5 | 1577 | * @match: Callback function to check gpio_chip |
594fa265 GL |
1578 | * |
1579 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1580 | * determined by a user supplied @match callback. The callback should return | |
1581 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1582 | * non-zero, this function will return to the caller and not iterate over any | |
1583 | * more gpio_chips. | |
1584 | */ | |
07ce8ec7 | 1585 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1586 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1587 | void *data)) |
594fa265 | 1588 | { |
ff2b1359 | 1589 | struct gpio_device *gdev; |
acf06ff7 | 1590 | struct gpio_chip *chip = NULL; |
594fa265 | 1591 | unsigned long flags; |
594fa265 GL |
1592 | |
1593 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1594 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1595 | if (gdev->chip && match(gdev->chip, data)) { |
1596 | chip = gdev->chip; | |
594fa265 | 1597 | break; |
acf06ff7 | 1598 | } |
ff2b1359 | 1599 | |
594fa265 GL |
1600 | spin_unlock_irqrestore(&gpio_lock, flags); |
1601 | ||
1602 | return chip; | |
1603 | } | |
8fa0c9bf | 1604 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1605 | |
79697ef9 AC |
1606 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1607 | { | |
1608 | const char *name = data; | |
1609 | ||
1610 | return !strcmp(chip->label, name); | |
1611 | } | |
1612 | ||
1613 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1614 | { | |
1615 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1616 | } | |
1617 | ||
14250520 LW |
1618 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1619 | ||
1620 | /* | |
1621 | * The following is irqchip helper code for gpiochips. | |
1622 | */ | |
1623 | ||
79b804cb MW |
1624 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1625 | { | |
dc7b0387 | 1626 | if (!gpiochip->irq.need_valid_mask) |
79b804cb MW |
1627 | return 0; |
1628 | ||
e4371f6e | 1629 | gpiochip->irq.valid_mask = gpiochip_allocate_mask(gpiochip); |
dc7b0387 | 1630 | if (!gpiochip->irq.valid_mask) |
79b804cb MW |
1631 | return -ENOMEM; |
1632 | ||
79b804cb MW |
1633 | return 0; |
1634 | } | |
1635 | ||
1636 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1637 | { | |
dc7b0387 TR |
1638 | kfree(gpiochip->irq.valid_mask); |
1639 | gpiochip->irq.valid_mask = NULL; | |
79b804cb MW |
1640 | } |
1641 | ||
64ff2c8e SB |
1642 | bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, |
1643 | unsigned int offset) | |
79b804cb | 1644 | { |
726cb3ba SB |
1645 | if (!gpiochip_line_is_valid(gpiochip, offset)) |
1646 | return false; | |
79b804cb | 1647 | /* No mask means all valid */ |
dc7b0387 | 1648 | if (likely(!gpiochip->irq.valid_mask)) |
79b804cb | 1649 | return true; |
dc7b0387 | 1650 | return test_bit(offset, gpiochip->irq.valid_mask); |
79b804cb | 1651 | } |
64ff2c8e | 1652 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid); |
79b804cb | 1653 | |
14250520 | 1654 | /** |
d245b3f9 | 1655 | * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip |
4892d3a6 | 1656 | * @gc: the gpiochip to set the irqchip chain to |
14250520 LW |
1657 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1658 | * chained irqchip | |
1659 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1660 | * coming out of the gpiochip. If the interrupt is nested rather than |
1661 | * cascaded, pass NULL in this handler argument | |
14250520 | 1662 | */ |
4892d3a6 | 1663 | static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gc, |
6f79309a | 1664 | unsigned int parent_irq, |
d245b3f9 | 1665 | irq_flow_handler_t parent_handler) |
14250520 | 1666 | { |
4892d3a6 LW |
1667 | struct gpio_irq_chip *girq = &gc->irq; |
1668 | struct device *dev = &gc->gpiodev->dev; | |
1669 | ||
1670 | if (!girq->domain) { | |
1671 | chip_err(gc, "called %s before setting up irqchip\n", | |
83141a77 | 1672 | __func__); |
1c8732bb LW |
1673 | return; |
1674 | } | |
1675 | ||
3f97d5fc | 1676 | if (parent_handler) { |
4892d3a6 LW |
1677 | if (gc->can_sleep) { |
1678 | chip_err(gc, | |
b1911710 | 1679 | "you cannot have chained interrupts on a chip that may sleep\n"); |
3f97d5fc LW |
1680 | return; |
1681 | } | |
4892d3a6 LW |
1682 | girq->parents = devm_kcalloc(dev, 1, |
1683 | sizeof(*girq->parents), | |
1684 | GFP_KERNEL); | |
1685 | if (!girq->parents) { | |
1686 | chip_err(gc, "out of memory allocating parent IRQ\n"); | |
1687 | return; | |
1688 | } | |
1689 | girq->parents[0] = parent_irq; | |
1690 | girq->num_parents = 1; | |
3f97d5fc LW |
1691 | /* |
1692 | * The parent irqchip is already using the chip_data for this | |
1693 | * irqchip, so our callbacks simply use the handler_data. | |
1694 | */ | |
f7f87753 | 1695 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
4892d3a6 | 1696 | gc); |
3f97d5fc | 1697 | } |
14250520 | 1698 | } |
d245b3f9 LW |
1699 | |
1700 | /** | |
1701 | * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip | |
1702 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1703 | * @irqchip: the irqchip to chain to the gpiochip | |
1704 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1705 | * chained irqchip | |
1706 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
40f5ff4f | 1707 | * coming out of the gpiochip. |
d245b3f9 LW |
1708 | */ |
1709 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1710 | struct irq_chip *irqchip, | |
6f79309a | 1711 | unsigned int parent_irq, |
d245b3f9 LW |
1712 | irq_flow_handler_t parent_handler) |
1713 | { | |
60ed54ca TR |
1714 | if (gpiochip->irq.threaded) { |
1715 | chip_err(gpiochip, "tried to chain a threaded gpiochip\n"); | |
1716 | return; | |
1717 | } | |
1718 | ||
3c1f6b2d | 1719 | gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, parent_handler); |
d245b3f9 | 1720 | } |
14250520 LW |
1721 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); |
1722 | ||
d245b3f9 LW |
1723 | /** |
1724 | * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip | |
1725 | * @gpiochip: the gpiochip to set the irqchip nested handler to | |
1726 | * @irqchip: the irqchip to nest to the gpiochip | |
1727 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1728 | * nested irqchip | |
1729 | */ | |
1730 | void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, | |
1731 | struct irq_chip *irqchip, | |
6f79309a | 1732 | unsigned int parent_irq) |
d245b3f9 | 1733 | { |
3c1f6b2d | 1734 | gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, NULL); |
d245b3f9 LW |
1735 | } |
1736 | EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); | |
1737 | ||
14250520 LW |
1738 | /** |
1739 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1740 | * @d: the irqdomain used by this irqchip | |
1741 | * @irq: the global irq number used by this GPIO irqchip irq | |
1742 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1743 | * | |
1744 | * This function will set up the mapping for a certain IRQ line on a | |
1745 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1746 | * stored inside the gpiochip. | |
1747 | */ | |
1b95b4eb TR |
1748 | int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, |
1749 | irq_hw_number_t hwirq) | |
14250520 LW |
1750 | { |
1751 | struct gpio_chip *chip = d->host_data; | |
e0d89728 | 1752 | int err = 0; |
14250520 | 1753 | |
dc749a09 GS |
1754 | if (!gpiochip_irqchip_irq_valid(chip, hwirq)) |
1755 | return -ENXIO; | |
1756 | ||
14250520 | 1757 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1758 | /* |
1759 | * This lock class tells lockdep that GPIO irqs are in a different | |
1760 | * category than their parents, so it won't report false recursion. | |
1761 | */ | |
39c3fd58 | 1762 | irq_set_lockdep_class(irq, chip->irq.lock_key, chip->irq.request_key); |
c7a0aa59 | 1763 | irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler); |
d245b3f9 | 1764 | /* Chips that use nested thread handlers have them marked */ |
60ed54ca | 1765 | if (chip->irq.threaded) |
1c8732bb | 1766 | irq_set_nested_thread(irq, 1); |
14250520 | 1767 | irq_set_noprobe(irq); |
23393d49 | 1768 | |
e0d89728 TR |
1769 | if (chip->irq.num_parents == 1) |
1770 | err = irq_set_parent(irq, chip->irq.parents[0]); | |
1771 | else if (chip->irq.map) | |
1772 | err = irq_set_parent(irq, chip->irq.map[hwirq]); | |
1773 | ||
1774 | if (err < 0) | |
1775 | return err; | |
1776 | ||
1333b90f LW |
1777 | /* |
1778 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1779 | * is passed as default type. | |
1780 | */ | |
3634eeb0 TR |
1781 | if (chip->irq.default_type != IRQ_TYPE_NONE) |
1782 | irq_set_irq_type(irq, chip->irq.default_type); | |
14250520 LW |
1783 | |
1784 | return 0; | |
1785 | } | |
1b95b4eb | 1786 | EXPORT_SYMBOL_GPL(gpiochip_irq_map); |
14250520 | 1787 | |
1b95b4eb | 1788 | void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
c3626fde | 1789 | { |
1c8732bb LW |
1790 | struct gpio_chip *chip = d->host_data; |
1791 | ||
60ed54ca | 1792 | if (chip->irq.threaded) |
1c8732bb | 1793 | irq_set_nested_thread(irq, 0); |
c3626fde LW |
1794 | irq_set_chip_and_handler(irq, NULL, NULL); |
1795 | irq_set_chip_data(irq, NULL); | |
1796 | } | |
1b95b4eb | 1797 | EXPORT_SYMBOL_GPL(gpiochip_irq_unmap); |
c3626fde | 1798 | |
14250520 LW |
1799 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1800 | .map = gpiochip_irq_map, | |
c3626fde | 1801 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1802 | /* Virtually all GPIO irqchips are twocell:ed */ |
1803 | .xlate = irq_domain_xlate_twocell, | |
1804 | }; | |
1805 | ||
ef74f70e BM |
1806 | /** |
1807 | * gpiochip_irq_domain_activate() - Lock a GPIO to be used as an IRQ | |
1808 | * @domain: The IRQ domain used by this IRQ chip | |
1809 | * @data: Outermost irq_data associated with the IRQ | |
1810 | * @reserve: If set, only reserve an interrupt vector instead of assigning one | |
1811 | * | |
1812 | * This function is a wrapper that calls gpiochip_lock_as_irq() and is to be | |
1813 | * used as the activate function for the &struct irq_domain_ops. The host_data | |
1814 | * for the IRQ domain must be the &struct gpio_chip. | |
1815 | */ | |
1816 | int gpiochip_irq_domain_activate(struct irq_domain *domain, | |
1817 | struct irq_data *data, bool reserve) | |
1818 | { | |
1819 | struct gpio_chip *chip = domain->host_data; | |
1820 | ||
1821 | return gpiochip_lock_as_irq(chip, data->hwirq); | |
1822 | } | |
1823 | EXPORT_SYMBOL_GPL(gpiochip_irq_domain_activate); | |
1824 | ||
1825 | /** | |
1826 | * gpiochip_irq_domain_deactivate() - Unlock a GPIO used as an IRQ | |
1827 | * @domain: The IRQ domain used by this IRQ chip | |
1828 | * @data: Outermost irq_data associated with the IRQ | |
1829 | * | |
1830 | * This function is a wrapper that will call gpiochip_unlock_as_irq() and is to | |
1831 | * be used as the deactivate function for the &struct irq_domain_ops. The | |
1832 | * host_data for the IRQ domain must be the &struct gpio_chip. | |
1833 | */ | |
1834 | void gpiochip_irq_domain_deactivate(struct irq_domain *domain, | |
1835 | struct irq_data *data) | |
1836 | { | |
1837 | struct gpio_chip *chip = domain->host_data; | |
1838 | ||
1839 | return gpiochip_unlock_as_irq(chip, data->hwirq); | |
1840 | } | |
1841 | EXPORT_SYMBOL_GPL(gpiochip_irq_domain_deactivate); | |
1842 | ||
4e6b8238 | 1843 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) |
14250520 | 1844 | { |
4e6b8238 HV |
1845 | if (!gpiochip_irqchip_irq_valid(chip, offset)) |
1846 | return -ENXIO; | |
5b76e79c | 1847 | |
4e6b8238 | 1848 | return irq_create_mapping(chip->irq.domain, offset); |
14250520 LW |
1849 | } |
1850 | ||
14250520 LW |
1851 | static int gpiochip_irq_reqres(struct irq_data *d) |
1852 | { | |
1853 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
5b76e79c | 1854 | |
4e6b8238 | 1855 | return gpiochip_reqres_irq(chip, d->hwirq); |
14250520 LW |
1856 | } |
1857 | ||
1858 | static void gpiochip_irq_relres(struct irq_data *d) | |
1859 | { | |
1860 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1861 | ||
4e6b8238 | 1862 | gpiochip_relres_irq(chip, d->hwirq); |
14250520 LW |
1863 | } |
1864 | ||
461c1a7d | 1865 | static void gpiochip_irq_enable(struct irq_data *d) |
14250520 | 1866 | { |
461c1a7d | 1867 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
e0d89728 | 1868 | |
461c1a7d HV |
1869 | gpiochip_enable_irq(chip, d->hwirq); |
1870 | if (chip->irq.irq_enable) | |
1871 | chip->irq.irq_enable(d); | |
1872 | else | |
1873 | chip->irq.chip->irq_unmask(d); | |
1874 | } | |
1875 | ||
1876 | static void gpiochip_irq_disable(struct irq_data *d) | |
1877 | { | |
1878 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1879 | ||
1880 | if (chip->irq.irq_disable) | |
1881 | chip->irq.irq_disable(d); | |
1882 | else | |
1883 | chip->irq.chip->irq_mask(d); | |
1884 | gpiochip_disable_irq(chip, d->hwirq); | |
1885 | } | |
1886 | ||
ca620f2d HV |
1887 | static void gpiochip_set_irq_hooks(struct gpio_chip *gpiochip) |
1888 | { | |
1889 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1890 | ||
1891 | if (!irqchip->irq_request_resources && | |
1892 | !irqchip->irq_release_resources) { | |
1893 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1894 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1895 | } | |
461c1a7d HV |
1896 | if (WARN_ON(gpiochip->irq.irq_enable)) |
1897 | return; | |
171948ea HV |
1898 | /* Check if the irqchip already has this hook... */ |
1899 | if (irqchip->irq_enable == gpiochip_irq_enable) { | |
1900 | /* | |
1901 | * ...and if so, give a gentle warning that this is bad | |
1902 | * practice. | |
1903 | */ | |
1904 | chip_info(gpiochip, | |
1905 | "detected irqchip that is shared with multiple gpiochips: please fix the driver.\n"); | |
1906 | return; | |
1907 | } | |
461c1a7d HV |
1908 | gpiochip->irq.irq_enable = irqchip->irq_enable; |
1909 | gpiochip->irq.irq_disable = irqchip->irq_disable; | |
1910 | irqchip->irq_enable = gpiochip_irq_enable; | |
1911 | irqchip->irq_disable = gpiochip_irq_disable; | |
14250520 LW |
1912 | } |
1913 | ||
e0d89728 TR |
1914 | /** |
1915 | * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip | |
1916 | * @gpiochip: the GPIO chip to add the IRQ chip to | |
39c3fd58 AL |
1917 | * @lock_key: lockdep class for IRQ lock |
1918 | * @request_key: lockdep class for IRQ request | |
e0d89728 | 1919 | */ |
959bc7b2 | 1920 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
1921 | struct lock_class_key *lock_key, |
1922 | struct lock_class_key *request_key) | |
e0d89728 TR |
1923 | { |
1924 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1925 | const struct irq_domain_ops *ops; | |
1926 | struct device_node *np; | |
1927 | unsigned int type; | |
1928 | unsigned int i; | |
1929 | ||
1930 | if (!irqchip) | |
1931 | return 0; | |
1932 | ||
1933 | if (gpiochip->irq.parent_handler && gpiochip->can_sleep) { | |
b1911710 | 1934 | chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n"); |
e0d89728 TR |
1935 | return -EINVAL; |
1936 | } | |
1937 | ||
1938 | np = gpiochip->gpiodev->dev.of_node; | |
1939 | type = gpiochip->irq.default_type; | |
1940 | ||
1941 | /* | |
1942 | * Specifying a default trigger is a terrible idea if DT or ACPI is | |
1943 | * used to configure the interrupts, as you may end up with | |
1944 | * conflicting triggers. Tell the user, and reset to NONE. | |
1945 | */ | |
1946 | if (WARN(np && type != IRQ_TYPE_NONE, | |
1947 | "%s: Ignoring %u default trigger\n", np->full_name, type)) | |
1948 | type = IRQ_TYPE_NONE; | |
1949 | ||
1950 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { | |
1951 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1952 | "Ignoring %u default trigger\n", type); | |
1953 | type = IRQ_TYPE_NONE; | |
1954 | } | |
1955 | ||
1956 | gpiochip->to_irq = gpiochip_to_irq; | |
1957 | gpiochip->irq.default_type = type; | |
959bc7b2 | 1958 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 1959 | gpiochip->irq.request_key = request_key; |
e0d89728 TR |
1960 | |
1961 | if (gpiochip->irq.domain_ops) | |
1962 | ops = gpiochip->irq.domain_ops; | |
1963 | else | |
1964 | ops = &gpiochip_domain_ops; | |
1965 | ||
1966 | gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio, | |
8302cf58 TR |
1967 | gpiochip->irq.first, |
1968 | ops, gpiochip); | |
e0d89728 TR |
1969 | if (!gpiochip->irq.domain) |
1970 | return -EINVAL; | |
1971 | ||
e0d89728 TR |
1972 | if (gpiochip->irq.parent_handler) { |
1973 | void *data = gpiochip->irq.parent_handler_data ?: gpiochip; | |
1974 | ||
1975 | for (i = 0; i < gpiochip->irq.num_parents; i++) { | |
1976 | /* | |
1977 | * The parent IRQ chip is already using the chip_data | |
1978 | * for this IRQ chip, so our callbacks simply use the | |
1979 | * handler_data. | |
1980 | */ | |
1981 | irq_set_chained_handler_and_data(gpiochip->irq.parents[i], | |
1982 | gpiochip->irq.parent_handler, | |
1983 | data); | |
1984 | } | |
e0d89728 TR |
1985 | } |
1986 | ||
ca620f2d HV |
1987 | gpiochip_set_irq_hooks(gpiochip); |
1988 | ||
e0d89728 TR |
1989 | acpi_gpiochip_request_interrupts(gpiochip); |
1990 | ||
1991 | return 0; | |
1992 | } | |
1993 | ||
14250520 LW |
1994 | /** |
1995 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1996 | * @gpiochip: the gpiochip to remove the irqchip from | |
1997 | * | |
1998 | * This is called only from gpiochip_remove() | |
1999 | */ | |
2000 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
2001 | { | |
ca620f2d | 2002 | struct irq_chip *irqchip = gpiochip->irq.chip; |
39e5f096 | 2003 | unsigned int offset; |
c3626fde | 2004 | |
afa82fab MW |
2005 | acpi_gpiochip_free_interrupts(gpiochip); |
2006 | ||
ca620f2d | 2007 | if (irqchip && gpiochip->irq.parent_handler) { |
39e5f096 TR |
2008 | struct gpio_irq_chip *irq = &gpiochip->irq; |
2009 | unsigned int i; | |
2010 | ||
2011 | for (i = 0; i < irq->num_parents; i++) | |
2012 | irq_set_chained_handler_and_data(irq->parents[i], | |
2013 | NULL, NULL); | |
25e4fe92 DES |
2014 | } |
2015 | ||
c3626fde | 2016 | /* Remove all IRQ mappings and delete the domain */ |
f0fbe7bc | 2017 | if (gpiochip->irq.domain) { |
39e5f096 TR |
2018 | unsigned int irq; |
2019 | ||
79b804cb MW |
2020 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
2021 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
2022 | continue; | |
f0fbe7bc TR |
2023 | |
2024 | irq = irq_find_mapping(gpiochip->irq.domain, offset); | |
2025 | irq_dispose_mapping(irq); | |
79b804cb | 2026 | } |
f0fbe7bc TR |
2027 | |
2028 | irq_domain_remove(gpiochip->irq.domain); | |
c3626fde | 2029 | } |
14250520 | 2030 | |
461c1a7d HV |
2031 | if (irqchip) { |
2032 | if (irqchip->irq_request_resources == gpiochip_irq_reqres) { | |
2033 | irqchip->irq_request_resources = NULL; | |
2034 | irqchip->irq_release_resources = NULL; | |
2035 | } | |
2036 | if (irqchip->irq_enable == gpiochip_irq_enable) { | |
2037 | irqchip->irq_enable = gpiochip->irq.irq_enable; | |
2038 | irqchip->irq_disable = gpiochip->irq.irq_disable; | |
2039 | } | |
14250520 | 2040 | } |
461c1a7d HV |
2041 | gpiochip->irq.irq_enable = NULL; |
2042 | gpiochip->irq.irq_disable = NULL; | |
ca620f2d | 2043 | gpiochip->irq.chip = NULL; |
79b804cb MW |
2044 | |
2045 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
2046 | } |
2047 | ||
2048 | /** | |
739e6f59 | 2049 | * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip |
14250520 LW |
2050 | * @gpiochip: the gpiochip to add the irqchip to |
2051 | * @irqchip: the irqchip to add to the gpiochip | |
2052 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
2053 | * allocate gpiochip irqs from | |
2054 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
2055 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
2056 | * to have the core avoid setting up any default type in the hardware. | |
60ed54ca | 2057 | * @threaded: whether this irqchip uses a nested thread handler |
39c3fd58 AL |
2058 | * @lock_key: lockdep class for IRQ lock |
2059 | * @request_key: lockdep class for IRQ request | |
14250520 LW |
2060 | * |
2061 | * This function closely associates a certain irqchip with a certain | |
2062 | * gpiochip, providing an irq domain to translate the local IRQs to | |
2063 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
2064 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 2065 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
2066 | * from the gpiochip passed as chip data. An irqdomain will be stored |
2067 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
2068 | * translation. The gpiochip will need to be initialized and registered | |
2069 | * before calling this function. | |
2070 | * | |
c3626fde LW |
2071 | * This function will handle two cell:ed simple IRQs and assumes all |
2072 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
2073 | * need to be open coded. |
2074 | */ | |
739e6f59 LW |
2075 | int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, |
2076 | struct irq_chip *irqchip, | |
2077 | unsigned int first_irq, | |
2078 | irq_flow_handler_t handler, | |
2079 | unsigned int type, | |
60ed54ca | 2080 | bool threaded, |
39c3fd58 AL |
2081 | struct lock_class_key *lock_key, |
2082 | struct lock_class_key *request_key) | |
14250520 LW |
2083 | { |
2084 | struct device_node *of_node; | |
14250520 LW |
2085 | |
2086 | if (!gpiochip || !irqchip) | |
2087 | return -EINVAL; | |
2088 | ||
58383c78 | 2089 | if (!gpiochip->parent) { |
14250520 LW |
2090 | pr_err("missing gpiochip .dev parent pointer\n"); |
2091 | return -EINVAL; | |
2092 | } | |
60ed54ca | 2093 | gpiochip->irq.threaded = threaded; |
58383c78 | 2094 | of_node = gpiochip->parent->of_node; |
14250520 LW |
2095 | #ifdef CONFIG_OF_GPIO |
2096 | /* | |
20a8a968 | 2097 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
2098 | * FIXME: get rid of this and use gpiochip->parent->of_node |
2099 | * everywhere | |
14250520 LW |
2100 | */ |
2101 | if (gpiochip->of_node) | |
2102 | of_node = gpiochip->of_node; | |
2103 | #endif | |
332e99d5 | 2104 | /* |
0a1e0053 | 2105 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
2106 | * used to configure the interrupts, as you may end-up with |
2107 | * conflicting triggers. Tell the user, and reset to NONE. | |
2108 | */ | |
2109 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
7eb6ce2f | 2110 | "%pOF: Ignoring %d default trigger\n", of_node, type)) |
332e99d5 | 2111 | type = IRQ_TYPE_NONE; |
0a1e0053 MW |
2112 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
2113 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
2114 | "Ignoring %d default trigger\n", type); | |
2115 | type = IRQ_TYPE_NONE; | |
2116 | } | |
332e99d5 | 2117 | |
da80ff81 | 2118 | gpiochip->irq.chip = irqchip; |
c7a0aa59 | 2119 | gpiochip->irq.handler = handler; |
3634eeb0 | 2120 | gpiochip->irq.default_type = type; |
14250520 | 2121 | gpiochip->to_irq = gpiochip_to_irq; |
ca9df053 | 2122 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 2123 | gpiochip->irq.request_key = request_key; |
f0fbe7bc | 2124 | gpiochip->irq.domain = irq_domain_add_simple(of_node, |
14250520 LW |
2125 | gpiochip->ngpio, first_irq, |
2126 | &gpiochip_domain_ops, gpiochip); | |
f0fbe7bc | 2127 | if (!gpiochip->irq.domain) { |
da80ff81 | 2128 | gpiochip->irq.chip = NULL; |
14250520 LW |
2129 | return -EINVAL; |
2130 | } | |
8b67a1f0 | 2131 | |
ca620f2d | 2132 | gpiochip_set_irq_hooks(gpiochip); |
14250520 | 2133 | |
afa82fab MW |
2134 | acpi_gpiochip_request_interrupts(gpiochip); |
2135 | ||
14250520 LW |
2136 | return 0; |
2137 | } | |
739e6f59 | 2138 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); |
14250520 LW |
2139 | |
2140 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
2141 | ||
959bc7b2 | 2142 | static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
2143 | struct lock_class_key *lock_key, |
2144 | struct lock_class_key *request_key) | |
e0d89728 TR |
2145 | { |
2146 | return 0; | |
2147 | } | |
2148 | ||
14250520 | 2149 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} |
79b804cb MW |
2150 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
2151 | { | |
2152 | return 0; | |
2153 | } | |
2154 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
2155 | { } | |
14250520 LW |
2156 | |
2157 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
2158 | ||
c771c2f4 JG |
2159 | /** |
2160 | * gpiochip_generic_request() - request the gpio function for a pin | |
2161 | * @chip: the gpiochip owning the GPIO | |
2162 | * @offset: the offset of the GPIO to request for GPIO function | |
2163 | */ | |
2164 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
2165 | { | |
a9a1d2a7 | 2166 | return pinctrl_gpio_request(chip->gpiodev->base + offset); |
c771c2f4 JG |
2167 | } |
2168 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
2169 | ||
2170 | /** | |
2171 | * gpiochip_generic_free() - free the gpio function from a pin | |
2172 | * @chip: the gpiochip to request the gpio function for | |
2173 | * @offset: the offset of the GPIO to free from GPIO function | |
2174 | */ | |
2175 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
2176 | { | |
a9a1d2a7 | 2177 | pinctrl_gpio_free(chip->gpiodev->base + offset); |
c771c2f4 JG |
2178 | } |
2179 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
2180 | ||
2956b5d9 MW |
2181 | /** |
2182 | * gpiochip_generic_config() - apply configuration for a pin | |
2183 | * @chip: the gpiochip owning the GPIO | |
2184 | * @offset: the offset of the GPIO to apply the configuration | |
2185 | * @config: the configuration to be applied | |
2186 | */ | |
2187 | int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, | |
2188 | unsigned long config) | |
2189 | { | |
2190 | return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); | |
2191 | } | |
2192 | EXPORT_SYMBOL_GPL(gpiochip_generic_config); | |
2193 | ||
f23f1516 | 2194 | #ifdef CONFIG_PINCTRL |
165adc9c | 2195 | |
586a87e6 CR |
2196 | /** |
2197 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
2198 | * @chip: the gpiochip to add the range for | |
d32651f6 | 2199 | * @pctldev: the pin controller to map to |
586a87e6 CR |
2200 | * @gpio_offset: the start offset in the current gpio_chip number space |
2201 | * @pin_group: name of the pin group inside the pin controller | |
973c1714 CL |
2202 | * |
2203 | * Calling this function directly from a DeviceTree-supported | |
2204 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2205 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2206 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
586a87e6 CR |
2207 | */ |
2208 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
2209 | struct pinctrl_dev *pctldev, | |
2210 | unsigned int gpio_offset, const char *pin_group) | |
2211 | { | |
2212 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2213 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
2214 | int ret; |
2215 | ||
2216 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
2217 | if (!pin_range) { | |
1a2a99c6 | 2218 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
2219 | return -ENOMEM; |
2220 | } | |
2221 | ||
2222 | /* Use local offset as range ID */ | |
2223 | pin_range->range.id = gpio_offset; | |
2224 | pin_range->range.gc = chip; | |
2225 | pin_range->range.name = chip->label; | |
fdeb8e15 | 2226 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
2227 | pin_range->pctldev = pctldev; |
2228 | ||
2229 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
2230 | &pin_range->range.pins, | |
2231 | &pin_range->range.npins); | |
61c6375d MN |
2232 | if (ret < 0) { |
2233 | kfree(pin_range); | |
586a87e6 | 2234 | return ret; |
61c6375d | 2235 | } |
586a87e6 CR |
2236 | |
2237 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
2238 | ||
1a2a99c6 AS |
2239 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
2240 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
2241 | pinctrl_dev_get_devname(pctldev), pin_group); |
2242 | ||
20ec3e39 | 2243 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
2244 | |
2245 | return 0; | |
2246 | } | |
2247 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
2248 | ||
3f0f8670 LW |
2249 | /** |
2250 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
2251 | * @chip: the gpiochip to add the range for | |
950d55f5 | 2252 | * @pinctl_name: the dev_name() of the pin controller to map to |
316511c0 LW |
2253 | * @gpio_offset: the start offset in the current gpio_chip number space |
2254 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
2255 | * @npins: the number of pins from the offset of each pin space (GPIO and |
2256 | * pin controller) to accumulate in this range | |
950d55f5 TR |
2257 | * |
2258 | * Returns: | |
2259 | * 0 on success, or a negative error-code on failure. | |
973c1714 CL |
2260 | * |
2261 | * Calling this function directly from a DeviceTree-supported | |
2262 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2263 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2264 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
3f0f8670 | 2265 | */ |
1e63d7b9 | 2266 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 2267 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 2268 | unsigned int npins) |
f23f1516 SH |
2269 | { |
2270 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2271 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 2272 | int ret; |
f23f1516 | 2273 | |
3f0f8670 | 2274 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 2275 | if (!pin_range) { |
1a2a99c6 | 2276 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 2277 | return -ENOMEM; |
f23f1516 SH |
2278 | } |
2279 | ||
3f0f8670 | 2280 | /* Use local offset as range ID */ |
316511c0 | 2281 | pin_range->range.id = gpio_offset; |
3f0f8670 | 2282 | pin_range->range.gc = chip; |
f23f1516 | 2283 | pin_range->range.name = chip->label; |
fdeb8e15 | 2284 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 2285 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 2286 | pin_range->range.npins = npins; |
192c369c | 2287 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 2288 | &pin_range->range); |
8f23ca1a | 2289 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 2290 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 2291 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 2292 | kfree(pin_range); |
b4d4b1f0 | 2293 | return ret; |
3f0f8670 | 2294 | } |
1a2a99c6 AS |
2295 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
2296 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
2297 | pinctl_name, |
2298 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 2299 | |
20ec3e39 | 2300 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
2301 | |
2302 | return 0; | |
f23f1516 | 2303 | } |
165adc9c | 2304 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 2305 | |
3f0f8670 LW |
2306 | /** |
2307 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
2308 | * @chip: the chip to remove all the mappings for | |
2309 | */ | |
f23f1516 SH |
2310 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
2311 | { | |
2312 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 2313 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 2314 | |
20ec3e39 | 2315 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
2316 | list_del(&pin_range->node); |
2317 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
2318 | &pin_range->range); | |
3f0f8670 | 2319 | kfree(pin_range); |
f23f1516 SH |
2320 | } |
2321 | } | |
165adc9c LW |
2322 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
2323 | ||
2324 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 2325 | |
d2876d08 DB |
2326 | /* These "optional" allocation calls help prevent drivers from stomping |
2327 | * on each other, and help provide better diagnostics in debugfs. | |
2328 | * They're called even less than the "set direction" calls. | |
2329 | */ | |
fac9d885 | 2330 | static int gpiod_request_commit(struct gpio_desc *desc, const char *label) |
d2876d08 | 2331 | { |
fdeb8e15 | 2332 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 2333 | int status; |
d2876d08 | 2334 | unsigned long flags; |
3789f5ac | 2335 | unsigned offset; |
d2876d08 | 2336 | |
18534df4 MS |
2337 | if (label) { |
2338 | label = kstrdup_const(label, GFP_KERNEL); | |
2339 | if (!label) | |
2340 | return -ENOMEM; | |
2341 | } | |
2342 | ||
bcabdef1 AC |
2343 | spin_lock_irqsave(&gpio_lock, flags); |
2344 | ||
d2876d08 | 2345 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 2346 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
2347 | */ |
2348 | ||
2349 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
2350 | desc_set_label(desc, label ? : "?"); | |
2351 | status = 0; | |
438d8908 | 2352 | } else { |
18534df4 | 2353 | kfree_const(label); |
d2876d08 | 2354 | status = -EBUSY; |
7460db56 | 2355 | goto done; |
35e8bb51 DB |
2356 | } |
2357 | ||
2358 | if (chip->request) { | |
2359 | /* chip->request may sleep */ | |
2360 | spin_unlock_irqrestore(&gpio_lock, flags); | |
3789f5ac BD |
2361 | offset = gpio_chip_hwgpio(desc); |
2362 | if (gpiochip_line_is_valid(chip, offset)) | |
2363 | status = chip->request(chip, offset); | |
2364 | else | |
2365 | status = -EINVAL; | |
35e8bb51 DB |
2366 | spin_lock_irqsave(&gpio_lock, flags); |
2367 | ||
2368 | if (status < 0) { | |
2369 | desc_set_label(desc, NULL); | |
18534df4 | 2370 | kfree_const(label); |
35e8bb51 | 2371 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 2372 | goto done; |
35e8bb51 | 2373 | } |
438d8908 | 2374 | } |
80b0a602 MN |
2375 | if (chip->get_direction) { |
2376 | /* chip->get_direction may sleep */ | |
2377 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2378 | gpiod_get_direction(desc); |
80b0a602 MN |
2379 | spin_lock_irqsave(&gpio_lock, flags); |
2380 | } | |
77c2d792 MW |
2381 | done: |
2382 | spin_unlock_irqrestore(&gpio_lock, flags); | |
2383 | return status; | |
2384 | } | |
2385 | ||
fdeb8e15 LW |
2386 | /* |
2387 | * This descriptor validation needs to be inserted verbatim into each | |
2388 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
2389 | * macro to avoid endless duplication. If the desc is NULL it is an |
2390 | * optional GPIO and calls should just bail out. | |
fdeb8e15 | 2391 | */ |
a746a232 RV |
2392 | static int validate_desc(const struct gpio_desc *desc, const char *func) |
2393 | { | |
2394 | if (!desc) | |
2395 | return 0; | |
2396 | if (IS_ERR(desc)) { | |
2397 | pr_warn("%s: invalid GPIO (errorpointer)\n", func); | |
2398 | return PTR_ERR(desc); | |
2399 | } | |
2400 | if (!desc->gdev) { | |
2401 | pr_warn("%s: invalid GPIO (no device)\n", func); | |
2402 | return -EINVAL; | |
2403 | } | |
2404 | if (!desc->gdev->chip) { | |
2405 | dev_warn(&desc->gdev->dev, | |
2406 | "%s: backing chip is gone\n", func); | |
2407 | return 0; | |
2408 | } | |
2409 | return 1; | |
2410 | } | |
2411 | ||
fdeb8e15 | 2412 | #define VALIDATE_DESC(desc) do { \ |
a746a232 RV |
2413 | int __valid = validate_desc(desc, __func__); \ |
2414 | if (__valid <= 0) \ | |
2415 | return __valid; \ | |
2416 | } while (0) | |
fdeb8e15 LW |
2417 | |
2418 | #define VALIDATE_DESC_VOID(desc) do { \ | |
a746a232 RV |
2419 | int __valid = validate_desc(desc, __func__); \ |
2420 | if (__valid <= 0) \ | |
fdeb8e15 | 2421 | return; \ |
a746a232 | 2422 | } while (0) |
fdeb8e15 | 2423 | |
0eb4c6c2 | 2424 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
2425 | { |
2426 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 2427 | struct gpio_device *gdev; |
77c2d792 | 2428 | |
fdeb8e15 LW |
2429 | VALIDATE_DESC(desc); |
2430 | gdev = desc->gdev; | |
77c2d792 | 2431 | |
fdeb8e15 | 2432 | if (try_module_get(gdev->owner)) { |
fac9d885 | 2433 | status = gpiod_request_commit(desc, label); |
77c2d792 | 2434 | if (status < 0) |
fdeb8e15 | 2435 | module_put(gdev->owner); |
33a68e86 LW |
2436 | else |
2437 | get_device(&gdev->dev); | |
77c2d792 MW |
2438 | } |
2439 | ||
d2876d08 | 2440 | if (status) |
7589e59f | 2441 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 2442 | |
d2876d08 DB |
2443 | return status; |
2444 | } | |
372e722e | 2445 | |
fac9d885 | 2446 | static bool gpiod_free_commit(struct gpio_desc *desc) |
d2876d08 | 2447 | { |
77c2d792 | 2448 | bool ret = false; |
d2876d08 | 2449 | unsigned long flags; |
35e8bb51 | 2450 | struct gpio_chip *chip; |
d2876d08 | 2451 | |
3d599d1c UKK |
2452 | might_sleep(); |
2453 | ||
372e722e | 2454 | gpiod_unexport(desc); |
d8f388d8 | 2455 | |
d2876d08 DB |
2456 | spin_lock_irqsave(&gpio_lock, flags); |
2457 | ||
fdeb8e15 | 2458 | chip = desc->gdev->chip; |
35e8bb51 DB |
2459 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2460 | if (chip->free) { | |
2461 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2462 | might_sleep_if(chip->can_sleep); |
372e722e | 2463 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2464 | spin_lock_irqsave(&gpio_lock, flags); |
2465 | } | |
18534df4 | 2466 | kfree_const(desc->label); |
d2876d08 | 2467 | desc_set_label(desc, NULL); |
07697461 | 2468 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2469 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2470 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2471 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2472 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2473 | ret = true; |
2474 | } | |
d2876d08 DB |
2475 | |
2476 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2477 | return ret; |
2478 | } | |
2479 | ||
0eb4c6c2 | 2480 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2481 | { |
fac9d885 | 2482 | if (desc && desc->gdev && gpiod_free_commit(desc)) { |
fdeb8e15 | 2483 | module_put(desc->gdev->owner); |
33a68e86 LW |
2484 | put_device(&desc->gdev->dev); |
2485 | } else { | |
77c2d792 | 2486 | WARN_ON(extra_checks); |
33a68e86 | 2487 | } |
d2876d08 | 2488 | } |
372e722e | 2489 | |
d2876d08 DB |
2490 | /** |
2491 | * gpiochip_is_requested - return string iff signal was requested | |
2492 | * @chip: controller managing the signal | |
2493 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2494 | * | |
2495 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2496 | * The string returned is the label passed to gpio_request(); if none has been |
2497 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2498 | * |
2499 | * This function is for use by GPIO controller drivers. The label can | |
2500 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2501 | * can help avoid accidentally multiplexing it to another controller. | |
2502 | */ | |
2503 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2504 | { | |
6c0b4e6c | 2505 | struct gpio_desc *desc; |
d2876d08 | 2506 | |
48b5953e | 2507 | if (offset >= chip->ngpio) |
d2876d08 | 2508 | return NULL; |
6c0b4e6c | 2509 | |
1c3cdb18 | 2510 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2511 | |
372e722e | 2512 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2513 | return NULL; |
372e722e | 2514 | return desc->label; |
d2876d08 DB |
2515 | } |
2516 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2517 | ||
77c2d792 MW |
2518 | /** |
2519 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
950d55f5 TR |
2520 | * @chip: GPIO chip |
2521 | * @hwnum: hardware number of the GPIO for which to request the descriptor | |
77c2d792 | 2522 | * @label: label for the GPIO |
5923ea6c LW |
2523 | * @lflags: lookup flags for this GPIO or 0 if default, this can be used to |
2524 | * specify things like line inversion semantics with the machine flags | |
2525 | * such as GPIO_OUT_LOW | |
2526 | * @dflags: descriptor request flags for this GPIO or 0 if default, this | |
2527 | * can be used to specify consumer semantics such as open drain | |
77c2d792 MW |
2528 | * |
2529 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2530 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2531 | * function will not increase reference count of the GPIO chip module. This | |
2532 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2533 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
950d55f5 TR |
2534 | * |
2535 | * Returns: | |
2536 | * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error | |
2537 | * code on failure. | |
77c2d792 | 2538 | */ |
abdc08a3 | 2539 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
21abf103 | 2540 | const char *label, |
5923ea6c LW |
2541 | enum gpio_lookup_flags lflags, |
2542 | enum gpiod_flags dflags) | |
77c2d792 | 2543 | { |
abdc08a3 AC |
2544 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2545 | int err; | |
77c2d792 | 2546 | |
abdc08a3 AC |
2547 | if (IS_ERR(desc)) { |
2548 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2549 | return desc; | |
2550 | } | |
2551 | ||
fac9d885 | 2552 | err = gpiod_request_commit(desc, label); |
abdc08a3 AC |
2553 | if (err < 0) |
2554 | return ERR_PTR(err); | |
77c2d792 | 2555 | |
5923ea6c | 2556 | err = gpiod_configure_flags(desc, label, lflags, dflags); |
21abf103 LW |
2557 | if (err) { |
2558 | chip_err(chip, "setup of own GPIO %s failed\n", label); | |
2559 | gpiod_free_commit(desc); | |
2560 | return ERR_PTR(err); | |
2561 | } | |
2562 | ||
abdc08a3 | 2563 | return desc; |
77c2d792 | 2564 | } |
f7d4ad98 | 2565 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2566 | |
2567 | /** | |
2568 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2569 | * @desc: GPIO descriptor to free | |
2570 | * | |
2571 | * Function frees the given GPIO requested previously with | |
2572 | * gpiochip_request_own_desc(). | |
2573 | */ | |
2574 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2575 | { | |
2576 | if (desc) | |
fac9d885 | 2577 | gpiod_free_commit(desc); |
77c2d792 | 2578 | } |
f7d4ad98 | 2579 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2580 | |
fdeb8e15 LW |
2581 | /* |
2582 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2583 | * some cases this is done in early boot, before IRQs are enabled. |
2584 | * | |
2585 | * As a rule these aren't called more than once (except for drivers | |
2586 | * using the open-drain emulation idiom) so these are natural places | |
2587 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2588 | * rely on gpio_request() having been called beforehand. | |
2589 | */ | |
2590 | ||
71479789 TP |
2591 | static int gpio_set_config(struct gpio_chip *gc, unsigned offset, |
2592 | enum pin_config_param mode) | |
2593 | { | |
542f3615 MR |
2594 | unsigned long config; |
2595 | unsigned arg; | |
71479789 | 2596 | |
542f3615 MR |
2597 | switch (mode) { |
2598 | case PIN_CONFIG_BIAS_PULL_DOWN: | |
2599 | case PIN_CONFIG_BIAS_PULL_UP: | |
2600 | arg = 1; | |
2601 | break; | |
2602 | ||
2603 | default: | |
2604 | arg = 0; | |
2605 | } | |
2606 | ||
2607 | config = PIN_CONF_PACKED(mode, arg); | |
71479789 TP |
2608 | return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP; |
2609 | } | |
2610 | ||
79a9becd AC |
2611 | /** |
2612 | * gpiod_direction_input - set the GPIO direction to input | |
2613 | * @desc: GPIO to set to input | |
2614 | * | |
2615 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2616 | * be called safely on it. | |
2617 | * | |
2618 | * Return 0 in case of success, else an error code. | |
2619 | */ | |
2620 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2621 | { |
d2876d08 | 2622 | struct gpio_chip *chip; |
ae9847f4 | 2623 | int status = 0; |
d2876d08 | 2624 | |
fdeb8e15 LW |
2625 | VALIDATE_DESC(desc); |
2626 | chip = desc->gdev->chip; | |
bcabdef1 | 2627 | |
e48d194d LW |
2628 | /* |
2629 | * It is legal to have no .get() and .direction_input() specified if | |
2630 | * the chip is output-only, but you can't specify .direction_input() | |
2631 | * and not support the .get() operation, that doesn't make sense. | |
2632 | */ | |
ae9847f4 | 2633 | if (!chip->get && chip->direction_input) { |
6424de5a | 2634 | gpiod_warn(desc, |
e48d194d LW |
2635 | "%s: missing get() but have direction_input()\n", |
2636 | __func__); | |
be1a4b13 LW |
2637 | return -EIO; |
2638 | } | |
2639 | ||
e48d194d LW |
2640 | /* |
2641 | * If we have a .direction_input() callback, things are simple, | |
2642 | * just call it. Else we are some input-only chip so try to check the | |
2643 | * direction (if .get_direction() is supported) else we silently | |
2644 | * assume we are in input mode after this. | |
2645 | */ | |
ae9847f4 RRD |
2646 | if (chip->direction_input) { |
2647 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); | |
2648 | } else if (chip->get_direction && | |
2649 | (chip->get_direction(chip, gpio_chip_hwgpio(desc)) != 1)) { | |
2650 | gpiod_warn(desc, | |
e48d194d LW |
2651 | "%s: missing direction_input() operation and line is output\n", |
2652 | __func__); | |
ae9847f4 RRD |
2653 | return -EIO; |
2654 | } | |
d2876d08 DB |
2655 | if (status == 0) |
2656 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2657 | |
d449991c TP |
2658 | if (test_bit(FLAG_PULL_UP, &desc->flags)) |
2659 | gpio_set_config(chip, gpio_chip_hwgpio(desc), | |
2660 | PIN_CONFIG_BIAS_PULL_UP); | |
2661 | else if (test_bit(FLAG_PULL_DOWN, &desc->flags)) | |
2662 | gpio_set_config(chip, gpio_chip_hwgpio(desc), | |
2663 | PIN_CONFIG_BIAS_PULL_DOWN); | |
2664 | ||
372e722e | 2665 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2666 | |
d2876d08 DB |
2667 | return status; |
2668 | } | |
79a9becd | 2669 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2670 | |
fac9d885 | 2671 | static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) |
d2876d08 | 2672 | { |
c663e5f5 | 2673 | struct gpio_chip *gc = desc->gdev->chip; |
ad17731d | 2674 | int val = !!value; |
ae9847f4 | 2675 | int ret = 0; |
d2876d08 | 2676 | |
e48d194d LW |
2677 | /* |
2678 | * It's OK not to specify .direction_output() if the gpiochip is | |
2679 | * output-only, but if there is then not even a .set() operation it | |
2680 | * is pretty tricky to drive the output line. | |
2681 | */ | |
ae9847f4 | 2682 | if (!gc->set && !gc->direction_output) { |
6424de5a | 2683 | gpiod_warn(desc, |
e48d194d LW |
2684 | "%s: missing set() and direction_output() operations\n", |
2685 | __func__); | |
be1a4b13 LW |
2686 | return -EIO; |
2687 | } | |
2688 | ||
ae9847f4 RRD |
2689 | if (gc->direction_output) { |
2690 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); | |
2691 | } else { | |
e48d194d | 2692 | /* Check that we are in output mode if we can */ |
ae9847f4 RRD |
2693 | if (gc->get_direction && |
2694 | gc->get_direction(gc, gpio_chip_hwgpio(desc))) { | |
2695 | gpiod_warn(desc, | |
2696 | "%s: missing direction_output() operation\n", | |
2697 | __func__); | |
2698 | return -EIO; | |
2699 | } | |
e48d194d LW |
2700 | /* |
2701 | * If we can't actively set the direction, we are some | |
2702 | * output-only chip, so just drive the output as desired. | |
2703 | */ | |
ae9847f4 RRD |
2704 | gc->set(gc, gpio_chip_hwgpio(desc), val); |
2705 | } | |
2706 | ||
c663e5f5 | 2707 | if (!ret) |
d2876d08 | 2708 | set_bit(FLAG_IS_OUT, &desc->flags); |
ad17731d | 2709 | trace_gpio_value(desc_to_gpio(desc), 0, val); |
c663e5f5 LW |
2710 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2711 | return ret; | |
d2876d08 | 2712 | } |
ef70bbe1 PZ |
2713 | |
2714 | /** | |
2715 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2716 | * @desc: GPIO to set to output | |
2717 | * @value: initial output value of the GPIO | |
2718 | * | |
2719 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2720 | * be called safely on it. The initial value of the output must be specified | |
2721 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2722 | * | |
2723 | * Return 0 in case of success, else an error code. | |
2724 | */ | |
2725 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2726 | { | |
fdeb8e15 | 2727 | VALIDATE_DESC(desc); |
fac9d885 | 2728 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 PZ |
2729 | } |
2730 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2731 | ||
2732 | /** | |
90df4fe0 | 2733 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2734 | * @desc: GPIO to set to output |
2735 | * @value: initial output value of the GPIO | |
2736 | * | |
2737 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2738 | * be called safely on it. The initial value of the output must be specified | |
2739 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2740 | * account. | |
2741 | * | |
2742 | * Return 0 in case of success, else an error code. | |
2743 | */ | |
2744 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2745 | { | |
30322bcf | 2746 | struct gpio_chip *gc; |
02e47980 LW |
2747 | int ret; |
2748 | ||
fdeb8e15 | 2749 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2750 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2751 | value = !value; | |
ad17731d LW |
2752 | else |
2753 | value = !!value; | |
02e47980 | 2754 | |
4e9439dd HV |
2755 | /* GPIOs used for enabled IRQs shall not be set as output */ |
2756 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) && | |
2757 | test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) { | |
02e47980 LW |
2758 | gpiod_err(desc, |
2759 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2760 | __func__); | |
2761 | return -EIO; | |
2762 | } | |
2763 | ||
30322bcf | 2764 | gc = desc->gdev->chip; |
02e47980 LW |
2765 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
2766 | /* First see if we can enable open drain in hardware */ | |
71479789 TP |
2767 | ret = gpio_set_config(gc, gpio_chip_hwgpio(desc), |
2768 | PIN_CONFIG_DRIVE_OPEN_DRAIN); | |
02e47980 LW |
2769 | if (!ret) |
2770 | goto set_output_value; | |
2771 | /* Emulate open drain by not actively driving the line high */ | |
2772 | if (value) | |
2773 | return gpiod_direction_input(desc); | |
2774 | } | |
2775 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
71479789 TP |
2776 | ret = gpio_set_config(gc, gpio_chip_hwgpio(desc), |
2777 | PIN_CONFIG_DRIVE_OPEN_SOURCE); | |
02e47980 LW |
2778 | if (!ret) |
2779 | goto set_output_value; | |
2780 | /* Emulate open source by not actively driving the line low */ | |
2781 | if (!value) | |
2782 | return gpiod_direction_input(desc); | |
2783 | } else { | |
71479789 TP |
2784 | gpio_set_config(gc, gpio_chip_hwgpio(desc), |
2785 | PIN_CONFIG_DRIVE_PUSH_PULL); | |
02e47980 LW |
2786 | } |
2787 | ||
2788 | set_output_value: | |
fac9d885 | 2789 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 | 2790 | } |
79a9becd | 2791 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2792 | |
c4b5be98 | 2793 | /** |
950d55f5 TR |
2794 | * gpiod_set_debounce - sets @debounce time for a GPIO |
2795 | * @desc: descriptor of the GPIO for which to set debounce time | |
2796 | * @debounce: debounce time in microseconds | |
65d87656 | 2797 | * |
950d55f5 TR |
2798 | * Returns: |
2799 | * 0 on success, %-ENOTSUPP if the controller doesn't support setting the | |
2800 | * debounce time. | |
c4b5be98 | 2801 | */ |
79a9becd | 2802 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2803 | { |
c4b5be98 | 2804 | struct gpio_chip *chip; |
2956b5d9 | 2805 | unsigned long config; |
c4b5be98 | 2806 | |
fdeb8e15 LW |
2807 | VALIDATE_DESC(desc); |
2808 | chip = desc->gdev->chip; | |
2956b5d9 | 2809 | if (!chip->set || !chip->set_config) { |
6424de5a | 2810 | gpiod_dbg(desc, |
2956b5d9 | 2811 | "%s: missing set() or set_config() operations\n", |
6424de5a | 2812 | __func__); |
65d87656 | 2813 | return -ENOTSUPP; |
be1a4b13 LW |
2814 | } |
2815 | ||
2956b5d9 | 2816 | config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
fa59dd23 | 2817 | return chip->set_config(chip, gpio_chip_hwgpio(desc), config); |
c4b5be98 | 2818 | } |
79a9becd | 2819 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2820 | |
e10f72bf AJ |
2821 | /** |
2822 | * gpiod_set_transitory - Lose or retain GPIO state on suspend or reset | |
2823 | * @desc: descriptor of the GPIO for which to configure persistence | |
2824 | * @transitory: True to lose state on suspend or reset, false for persistence | |
2825 | * | |
2826 | * Returns: | |
2827 | * 0 on success, otherwise a negative error code. | |
2828 | */ | |
2829 | int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) | |
2830 | { | |
2831 | struct gpio_chip *chip; | |
2832 | unsigned long packed; | |
2833 | int gpio; | |
2834 | int rc; | |
2835 | ||
156dd392 | 2836 | VALIDATE_DESC(desc); |
e10f72bf AJ |
2837 | /* |
2838 | * Handle FLAG_TRANSITORY first, enabling queries to gpiolib for | |
2839 | * persistence state. | |
2840 | */ | |
2841 | if (transitory) | |
2842 | set_bit(FLAG_TRANSITORY, &desc->flags); | |
2843 | else | |
2844 | clear_bit(FLAG_TRANSITORY, &desc->flags); | |
2845 | ||
2846 | /* If the driver supports it, set the persistence state now */ | |
2847 | chip = desc->gdev->chip; | |
2848 | if (!chip->set_config) | |
2849 | return 0; | |
2850 | ||
2851 | packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE, | |
2852 | !transitory); | |
2853 | gpio = gpio_chip_hwgpio(desc); | |
fa59dd23 | 2854 | rc = chip->set_config(chip, gpio, packed); |
e10f72bf AJ |
2855 | if (rc == -ENOTSUPP) { |
2856 | dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n", | |
2857 | gpio); | |
2858 | return 0; | |
2859 | } | |
2860 | ||
2861 | return rc; | |
2862 | } | |
2863 | EXPORT_SYMBOL_GPL(gpiod_set_transitory); | |
2864 | ||
79a9becd AC |
2865 | /** |
2866 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2867 | * @desc: the gpio descriptor to test | |
2868 | * | |
2869 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2870 | */ | |
2871 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2872 | { |
fdeb8e15 | 2873 | VALIDATE_DESC(desc); |
79a9becd | 2874 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2875 | } |
79a9becd | 2876 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2877 | |
2878 | /* I/O calls are only valid after configuration completed; the relevant | |
2879 | * "is this a valid GPIO" error checks should already have been done. | |
2880 | * | |
2881 | * "Get" operations are often inlinable as reading a pin value register, | |
2882 | * and masking the relevant bit in that register. | |
2883 | * | |
2884 | * When "set" operations are inlinable, they involve writing that mask to | |
2885 | * one register to set a low value, or a different register to set it high. | |
2886 | * Otherwise locking is needed, so there may be little value to inlining. | |
2887 | * | |
2888 | *------------------------------------------------------------------------ | |
2889 | * | |
2890 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2891 | * have requested the GPIO. That can include implicit requesting by | |
2892 | * a direction setting call. Marking a gpio as requested locks its chip | |
2893 | * in memory, guaranteeing that these table lookups need no more locking | |
2894 | * and that gpiochip_remove() will fail. | |
2895 | * | |
2896 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2897 | * that the GPIO was actually requested. | |
2898 | */ | |
2899 | ||
fac9d885 | 2900 | static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) |
d2876d08 DB |
2901 | { |
2902 | struct gpio_chip *chip; | |
372e722e | 2903 | int offset; |
e20538b8 | 2904 | int value; |
d2876d08 | 2905 | |
fdeb8e15 | 2906 | chip = desc->gdev->chip; |
372e722e | 2907 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2908 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2909 | value = value < 0 ? value : !!value; |
372e722e | 2910 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2911 | return value; |
d2876d08 | 2912 | } |
372e722e | 2913 | |
eec1d566 LW |
2914 | static int gpio_chip_get_multiple(struct gpio_chip *chip, |
2915 | unsigned long *mask, unsigned long *bits) | |
2916 | { | |
2917 | if (chip->get_multiple) { | |
2918 | return chip->get_multiple(chip, mask, bits); | |
2919 | } else if (chip->get) { | |
2920 | int i, value; | |
2921 | ||
2922 | for_each_set_bit(i, mask, chip->ngpio) { | |
2923 | value = chip->get(chip, i); | |
2924 | if (value < 0) | |
2925 | return value; | |
2926 | __assign_bit(i, bits, value); | |
2927 | } | |
2928 | return 0; | |
2929 | } | |
2930 | return -EIO; | |
2931 | } | |
2932 | ||
2933 | int gpiod_get_array_value_complex(bool raw, bool can_sleep, | |
2934 | unsigned int array_size, | |
2935 | struct gpio_desc **desc_array, | |
77588c14 | 2936 | struct gpio_array *array_info, |
b9762beb | 2937 | unsigned long *value_bitmap) |
eec1d566 | 2938 | { |
b17566a6 JK |
2939 | int err, i = 0; |
2940 | ||
2941 | /* | |
2942 | * Validate array_info against desc_array and its size. | |
2943 | * It should immediately follow desc_array if both | |
2944 | * have been obtained from the same gpiod_get_array() call. | |
2945 | */ | |
2946 | if (array_info && array_info->desc == desc_array && | |
2947 | array_size <= array_info->size && | |
2948 | (void *)array_info == desc_array + array_info->size) { | |
2949 | if (!can_sleep) | |
2950 | WARN_ON(array_info->chip->can_sleep); | |
2951 | ||
2952 | err = gpio_chip_get_multiple(array_info->chip, | |
2953 | array_info->get_mask, | |
2954 | value_bitmap); | |
2955 | if (err) | |
2956 | return err; | |
2957 | ||
2958 | if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) | |
2959 | bitmap_xor(value_bitmap, value_bitmap, | |
2960 | array_info->invert_mask, array_size); | |
2961 | ||
2962 | if (bitmap_full(array_info->get_mask, array_size)) | |
2963 | return 0; | |
2964 | ||
2965 | i = find_first_zero_bit(array_info->get_mask, array_size); | |
2966 | } else { | |
2967 | array_info = NULL; | |
2968 | } | |
eec1d566 LW |
2969 | |
2970 | while (i < array_size) { | |
2971 | struct gpio_chip *chip = desc_array[i]->gdev->chip; | |
3027743f LA |
2972 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
2973 | unsigned long *mask, *bits; | |
eec1d566 LW |
2974 | int first, j, ret; |
2975 | ||
3027743f LA |
2976 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
2977 | mask = fastpath; | |
2978 | } else { | |
2979 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
2980 | sizeof(*mask), | |
2981 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
2982 | if (!mask) | |
2983 | return -ENOMEM; | |
2984 | } | |
2985 | ||
2986 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
2987 | bitmap_zero(mask, chip->ngpio); | |
2988 | ||
eec1d566 LW |
2989 | if (!can_sleep) |
2990 | WARN_ON(chip->can_sleep); | |
2991 | ||
2992 | /* collect all inputs belonging to the same chip */ | |
2993 | first = i; | |
eec1d566 LW |
2994 | do { |
2995 | const struct gpio_desc *desc = desc_array[i]; | |
2996 | int hwgpio = gpio_chip_hwgpio(desc); | |
2997 | ||
2998 | __set_bit(hwgpio, mask); | |
2999 | i++; | |
b17566a6 JK |
3000 | |
3001 | if (array_info) | |
35ae7f96 JK |
3002 | i = find_next_zero_bit(array_info->get_mask, |
3003 | array_size, i); | |
eec1d566 LW |
3004 | } while ((i < array_size) && |
3005 | (desc_array[i]->gdev->chip == chip)); | |
3006 | ||
3007 | ret = gpio_chip_get_multiple(chip, mask, bits); | |
3027743f LA |
3008 | if (ret) { |
3009 | if (mask != fastpath) | |
3010 | kfree(mask); | |
eec1d566 | 3011 | return ret; |
3027743f | 3012 | } |
eec1d566 | 3013 | |
b17566a6 | 3014 | for (j = first; j < i; ) { |
eec1d566 LW |
3015 | const struct gpio_desc *desc = desc_array[j]; |
3016 | int hwgpio = gpio_chip_hwgpio(desc); | |
3017 | int value = test_bit(hwgpio, bits); | |
3018 | ||
3019 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
3020 | value = !value; | |
b9762beb | 3021 | __assign_bit(j, value_bitmap, value); |
eec1d566 | 3022 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
799d5eb4 | 3023 | j++; |
b17566a6 JK |
3024 | |
3025 | if (array_info) | |
35ae7f96 JK |
3026 | j = find_next_zero_bit(array_info->get_mask, i, |
3027 | j); | |
eec1d566 | 3028 | } |
3027743f LA |
3029 | |
3030 | if (mask != fastpath) | |
3031 | kfree(mask); | |
eec1d566 LW |
3032 | } |
3033 | return 0; | |
3034 | } | |
3035 | ||
d2876d08 | 3036 | /** |
79a9becd AC |
3037 | * gpiod_get_raw_value() - return a gpio's raw value |
3038 | * @desc: gpio whose value will be returned | |
d2876d08 | 3039 | * |
79a9becd | 3040 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 3041 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd | 3042 | * |
827a9b8b | 3043 | * This function can be called from contexts where we cannot sleep, and will |
79a9becd | 3044 | * complain if the GPIO chip functions potentially sleep. |
d2876d08 | 3045 | */ |
79a9becd | 3046 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 3047 | { |
fdeb8e15 | 3048 | VALIDATE_DESC(desc); |
3285170f | 3049 | /* Should be using gpiod_get_raw_value_cansleep() */ |
fdeb8e15 | 3050 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 3051 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 3052 | } |
79a9becd | 3053 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 3054 | |
79a9becd AC |
3055 | /** |
3056 | * gpiod_get_value() - return a gpio's value | |
3057 | * @desc: gpio whose value will be returned | |
3058 | * | |
3059 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 3060 | * account, or negative errno on failure. |
79a9becd | 3061 | * |
827a9b8b | 3062 | * This function can be called from contexts where we cannot sleep, and will |
79a9becd AC |
3063 | * complain if the GPIO chip functions potentially sleep. |
3064 | */ | |
3065 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 3066 | { |
79a9becd | 3067 | int value; |
fdeb8e15 LW |
3068 | |
3069 | VALIDATE_DESC(desc); | |
3285170f | 3070 | /* Should be using gpiod_get_value_cansleep() */ |
fdeb8e15 | 3071 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 3072 | |
fac9d885 | 3073 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
3074 | if (value < 0) |
3075 | return value; | |
3076 | ||
79a9becd AC |
3077 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3078 | value = !value; | |
3079 | ||
3080 | return value; | |
372e722e | 3081 | } |
79a9becd | 3082 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 3083 | |
eec1d566 LW |
3084 | /** |
3085 | * gpiod_get_raw_array_value() - read raw values from an array of GPIOs | |
b9762beb | 3086 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3087 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3088 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3089 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3090 | * |
3091 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
3092 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
3093 | * else an error code. | |
3094 | * | |
827a9b8b | 3095 | * This function can be called from contexts where we cannot sleep, |
eec1d566 LW |
3096 | * and it will complain if the GPIO chip functions potentially sleep. |
3097 | */ | |
3098 | int gpiod_get_raw_array_value(unsigned int array_size, | |
b9762beb | 3099 | struct gpio_desc **desc_array, |
77588c14 | 3100 | struct gpio_array *array_info, |
b9762beb | 3101 | unsigned long *value_bitmap) |
eec1d566 LW |
3102 | { |
3103 | if (!desc_array) | |
3104 | return -EINVAL; | |
3105 | return gpiod_get_array_value_complex(true, false, array_size, | |
77588c14 JK |
3106 | desc_array, array_info, |
3107 | value_bitmap); | |
eec1d566 LW |
3108 | } |
3109 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value); | |
3110 | ||
3111 | /** | |
3112 | * gpiod_get_array_value() - read values from an array of GPIOs | |
b9762beb | 3113 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3114 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3115 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3116 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3117 | * |
3118 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3119 | * into account. Return 0 in case of success, else an error code. | |
3120 | * | |
827a9b8b | 3121 | * This function can be called from contexts where we cannot sleep, |
eec1d566 LW |
3122 | * and it will complain if the GPIO chip functions potentially sleep. |
3123 | */ | |
3124 | int gpiod_get_array_value(unsigned int array_size, | |
b9762beb | 3125 | struct gpio_desc **desc_array, |
77588c14 | 3126 | struct gpio_array *array_info, |
b9762beb | 3127 | unsigned long *value_bitmap) |
eec1d566 LW |
3128 | { |
3129 | if (!desc_array) | |
3130 | return -EINVAL; | |
3131 | return gpiod_get_array_value_complex(false, false, array_size, | |
77588c14 JK |
3132 | desc_array, array_info, |
3133 | value_bitmap); | |
eec1d566 LW |
3134 | } |
3135 | EXPORT_SYMBOL_GPL(gpiod_get_array_value); | |
3136 | ||
aca5ce14 | 3137 | /* |
fac9d885 | 3138 | * gpio_set_open_drain_value_commit() - Set the open drain gpio's value. |
79a9becd | 3139 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 3140 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 3141 | */ |
fac9d885 | 3142 | static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
3143 | { |
3144 | int err = 0; | |
fdeb8e15 | 3145 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
3146 | int offset = gpio_chip_hwgpio(desc); |
3147 | ||
aca5ce14 | 3148 | if (value) { |
372e722e | 3149 | err = chip->direction_input(chip, offset); |
aca5ce14 | 3150 | if (!err) |
372e722e | 3151 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 3152 | } else { |
372e722e | 3153 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 3154 | if (!err) |
372e722e | 3155 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 3156 | } |
372e722e | 3157 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 3158 | if (err < 0) |
6424de5a MB |
3159 | gpiod_err(desc, |
3160 | "%s: Error in set_value for open drain err %d\n", | |
3161 | __func__, err); | |
aca5ce14 LD |
3162 | } |
3163 | ||
25553ff0 | 3164 | /* |
79a9becd AC |
3165 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
3166 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 3167 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 3168 | */ |
fac9d885 | 3169 | static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) |
25553ff0 LD |
3170 | { |
3171 | int err = 0; | |
fdeb8e15 | 3172 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
3173 | int offset = gpio_chip_hwgpio(desc); |
3174 | ||
25553ff0 | 3175 | if (value) { |
372e722e | 3176 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 3177 | if (!err) |
372e722e | 3178 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 3179 | } else { |
372e722e | 3180 | err = chip->direction_input(chip, offset); |
25553ff0 | 3181 | if (!err) |
372e722e | 3182 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 3183 | } |
372e722e | 3184 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 3185 | if (err < 0) |
6424de5a MB |
3186 | gpiod_err(desc, |
3187 | "%s: Error in set_value for open source err %d\n", | |
3188 | __func__, err); | |
25553ff0 LD |
3189 | } |
3190 | ||
fac9d885 | 3191 | static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) |
d2876d08 DB |
3192 | { |
3193 | struct gpio_chip *chip; | |
3194 | ||
fdeb8e15 | 3195 | chip = desc->gdev->chip; |
372e722e | 3196 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
02e47980 | 3197 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
372e722e AC |
3198 | } |
3199 | ||
5f424243 RI |
3200 | /* |
3201 | * set multiple outputs on the same chip; | |
3202 | * use the chip's set_multiple function if available; | |
3203 | * otherwise set the outputs sequentially; | |
3204 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
3205 | * defines which outputs are to be changed | |
3206 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
3207 | * defines the values the outputs specified by mask are to be set to | |
3208 | */ | |
3209 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
3210 | unsigned long *mask, unsigned long *bits) | |
3211 | { | |
3212 | if (chip->set_multiple) { | |
3213 | chip->set_multiple(chip, mask, bits); | |
3214 | } else { | |
5e4e6fb3 AS |
3215 | unsigned int i; |
3216 | ||
3217 | /* set outputs if the corresponding mask bit is set */ | |
3218 | for_each_set_bit(i, mask, chip->ngpio) | |
3219 | chip->set(chip, i, test_bit(i, bits)); | |
5f424243 RI |
3220 | } |
3221 | } | |
3222 | ||
3027743f | 3223 | int gpiod_set_array_value_complex(bool raw, bool can_sleep, |
3c940660 GU |
3224 | unsigned int array_size, |
3225 | struct gpio_desc **desc_array, | |
3226 | struct gpio_array *array_info, | |
3227 | unsigned long *value_bitmap) | |
5f424243 RI |
3228 | { |
3229 | int i = 0; | |
3230 | ||
b17566a6 JK |
3231 | /* |
3232 | * Validate array_info against desc_array and its size. | |
3233 | * It should immediately follow desc_array if both | |
3234 | * have been obtained from the same gpiod_get_array() call. | |
3235 | */ | |
3236 | if (array_info && array_info->desc == desc_array && | |
3237 | array_size <= array_info->size && | |
3238 | (void *)array_info == desc_array + array_info->size) { | |
3239 | if (!can_sleep) | |
3240 | WARN_ON(array_info->chip->can_sleep); | |
3241 | ||
3242 | if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) | |
3243 | bitmap_xor(value_bitmap, value_bitmap, | |
3244 | array_info->invert_mask, array_size); | |
3245 | ||
3246 | gpio_chip_set_multiple(array_info->chip, array_info->set_mask, | |
3247 | value_bitmap); | |
3248 | ||
3249 | if (bitmap_full(array_info->set_mask, array_size)) | |
3250 | return 0; | |
3251 | ||
3252 | i = find_first_zero_bit(array_info->set_mask, array_size); | |
3253 | } else { | |
3254 | array_info = NULL; | |
3255 | } | |
3256 | ||
5f424243 | 3257 | while (i < array_size) { |
fdeb8e15 | 3258 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
3027743f LA |
3259 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
3260 | unsigned long *mask, *bits; | |
5f424243 RI |
3261 | int count = 0; |
3262 | ||
3027743f LA |
3263 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
3264 | mask = fastpath; | |
3265 | } else { | |
3266 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
3267 | sizeof(*mask), | |
3268 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
3269 | if (!mask) | |
3270 | return -ENOMEM; | |
3271 | } | |
3272 | ||
3273 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
3274 | bitmap_zero(mask, chip->ngpio); | |
3275 | ||
38e003f4 | 3276 | if (!can_sleep) |
5f424243 | 3277 | WARN_ON(chip->can_sleep); |
38e003f4 | 3278 | |
5f424243 RI |
3279 | do { |
3280 | struct gpio_desc *desc = desc_array[i]; | |
3281 | int hwgpio = gpio_chip_hwgpio(desc); | |
b9762beb | 3282 | int value = test_bit(i, value_bitmap); |
5f424243 | 3283 | |
b17566a6 JK |
3284 | /* |
3285 | * Pins applicable for fast input but not for | |
3286 | * fast output processing may have been already | |
3287 | * inverted inside the fast path, skip them. | |
3288 | */ | |
3289 | if (!raw && !(array_info && | |
3290 | test_bit(i, array_info->invert_mask)) && | |
3291 | test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
5f424243 RI |
3292 | value = !value; |
3293 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
3294 | /* | |
3295 | * collect all normal outputs belonging to the same chip | |
3296 | * open drain and open source outputs are set individually | |
3297 | */ | |
02e47980 | 3298 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) { |
fac9d885 | 3299 | gpio_set_open_drain_value_commit(desc, value); |
02e47980 | 3300 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) { |
fac9d885 | 3301 | gpio_set_open_source_value_commit(desc, value); |
5f424243 RI |
3302 | } else { |
3303 | __set_bit(hwgpio, mask); | |
38e003f4 | 3304 | if (value) |
5f424243 | 3305 | __set_bit(hwgpio, bits); |
38e003f4 | 3306 | else |
5f424243 | 3307 | __clear_bit(hwgpio, bits); |
5f424243 RI |
3308 | count++; |
3309 | } | |
3310 | i++; | |
b17566a6 JK |
3311 | |
3312 | if (array_info) | |
35ae7f96 JK |
3313 | i = find_next_zero_bit(array_info->set_mask, |
3314 | array_size, i); | |
fdeb8e15 LW |
3315 | } while ((i < array_size) && |
3316 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 3317 | /* push collected bits to outputs */ |
38e003f4 | 3318 | if (count != 0) |
5f424243 | 3319 | gpio_chip_set_multiple(chip, mask, bits); |
3027743f LA |
3320 | |
3321 | if (mask != fastpath) | |
3322 | kfree(mask); | |
5f424243 | 3323 | } |
3027743f | 3324 | return 0; |
5f424243 RI |
3325 | } |
3326 | ||
d2876d08 | 3327 | /** |
79a9becd AC |
3328 | * gpiod_set_raw_value() - assign a gpio's raw value |
3329 | * @desc: gpio whose value will be assigned | |
d2876d08 | 3330 | * @value: value to assign |
d2876d08 | 3331 | * |
79a9becd AC |
3332 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
3333 | * regard for its ACTIVE_LOW status. | |
3334 | * | |
827a9b8b | 3335 | * This function can be called from contexts where we cannot sleep, and will |
79a9becd | 3336 | * complain if the GPIO chip functions potentially sleep. |
d2876d08 | 3337 | */ |
79a9becd | 3338 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 3339 | { |
fdeb8e15 | 3340 | VALIDATE_DESC_VOID(desc); |
3285170f | 3341 | /* Should be using gpiod_set_raw_value_cansleep() */ |
fdeb8e15 | 3342 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 3343 | gpiod_set_raw_value_commit(desc, value); |
d2876d08 | 3344 | } |
79a9becd | 3345 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 | 3346 | |
1e77fc82 GU |
3347 | /** |
3348 | * gpiod_set_value_nocheck() - set a GPIO line value without checking | |
3349 | * @desc: the descriptor to set the value on | |
3350 | * @value: value to set | |
3351 | * | |
3352 | * This sets the value of a GPIO line backing a descriptor, applying | |
3353 | * different semantic quirks like active low and open drain/source | |
3354 | * handling. | |
3355 | */ | |
3356 | static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value) | |
3357 | { | |
3358 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
3359 | value = !value; | |
3360 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
3361 | gpio_set_open_drain_value_commit(desc, value); | |
3362 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
3363 | gpio_set_open_source_value_commit(desc, value); | |
3364 | else | |
3365 | gpiod_set_raw_value_commit(desc, value); | |
3366 | } | |
3367 | ||
d2876d08 | 3368 | /** |
79a9becd AC |
3369 | * gpiod_set_value() - assign a gpio's value |
3370 | * @desc: gpio whose value will be assigned | |
3371 | * @value: value to assign | |
3372 | * | |
02e47980 LW |
3373 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW, |
3374 | * OPEN_DRAIN and OPEN_SOURCE flags into account. | |
d2876d08 | 3375 | * |
827a9b8b | 3376 | * This function can be called from contexts where we cannot sleep, and will |
79a9becd | 3377 | * complain if the GPIO chip functions potentially sleep. |
d2876d08 | 3378 | */ |
79a9becd | 3379 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 3380 | { |
fdeb8e15 | 3381 | VALIDATE_DESC_VOID(desc); |
3285170f | 3382 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 3383 | WARN_ON(desc->gdev->chip->can_sleep); |
1e77fc82 | 3384 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3385 | } |
79a9becd | 3386 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 3387 | |
5f424243 | 3388 | /** |
3fff99bc | 3389 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
b9762beb | 3390 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3391 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3392 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3393 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3394 | * |
3395 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3396 | * without regard for their ACTIVE_LOW status. | |
3397 | * | |
827a9b8b | 3398 | * This function can be called from contexts where we cannot sleep, and will |
5f424243 RI |
3399 | * complain if the GPIO chip functions potentially sleep. |
3400 | */ | |
3027743f | 3401 | int gpiod_set_raw_array_value(unsigned int array_size, |
3c940660 GU |
3402 | struct gpio_desc **desc_array, |
3403 | struct gpio_array *array_info, | |
3404 | unsigned long *value_bitmap) | |
5f424243 RI |
3405 | { |
3406 | if (!desc_array) | |
3027743f LA |
3407 | return -EINVAL; |
3408 | return gpiod_set_array_value_complex(true, false, array_size, | |
77588c14 | 3409 | desc_array, array_info, value_bitmap); |
5f424243 | 3410 | } |
3fff99bc | 3411 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
3412 | |
3413 | /** | |
3fff99bc | 3414 | * gpiod_set_array_value() - assign values to an array of GPIOs |
b9762beb | 3415 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3416 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3417 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3418 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3419 | * |
3420 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3421 | * into account. | |
3422 | * | |
827a9b8b | 3423 | * This function can be called from contexts where we cannot sleep, and will |
5f424243 RI |
3424 | * complain if the GPIO chip functions potentially sleep. |
3425 | */ | |
cf9af0d5 GU |
3426 | int gpiod_set_array_value(unsigned int array_size, |
3427 | struct gpio_desc **desc_array, | |
3428 | struct gpio_array *array_info, | |
3429 | unsigned long *value_bitmap) | |
5f424243 RI |
3430 | { |
3431 | if (!desc_array) | |
cf9af0d5 GU |
3432 | return -EINVAL; |
3433 | return gpiod_set_array_value_complex(false, false, array_size, | |
3434 | desc_array, array_info, | |
3435 | value_bitmap); | |
5f424243 | 3436 | } |
3fff99bc | 3437 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 3438 | |
d2876d08 | 3439 | /** |
79a9becd AC |
3440 | * gpiod_cansleep() - report whether gpio value access may sleep |
3441 | * @desc: gpio to check | |
d2876d08 | 3442 | * |
d2876d08 | 3443 | */ |
79a9becd | 3444 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 3445 | { |
fdeb8e15 LW |
3446 | VALIDATE_DESC(desc); |
3447 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 3448 | } |
79a9becd | 3449 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 3450 | |
90b39402 LW |
3451 | /** |
3452 | * gpiod_set_consumer_name() - set the consumer name for the descriptor | |
3453 | * @desc: gpio to set the consumer name on | |
3454 | * @name: the new consumer name | |
3455 | */ | |
18534df4 | 3456 | int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name) |
90b39402 | 3457 | { |
18534df4 MS |
3458 | VALIDATE_DESC(desc); |
3459 | if (name) { | |
3460 | name = kstrdup_const(name, GFP_KERNEL); | |
3461 | if (!name) | |
3462 | return -ENOMEM; | |
3463 | } | |
3464 | ||
3465 | kfree_const(desc->label); | |
3466 | desc_set_label(desc, name); | |
3467 | ||
3468 | return 0; | |
90b39402 LW |
3469 | } |
3470 | EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); | |
3471 | ||
0f6d504e | 3472 | /** |
79a9becd AC |
3473 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
3474 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 3475 | * |
79a9becd AC |
3476 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
3477 | * error. | |
0f6d504e | 3478 | */ |
79a9becd | 3479 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 3480 | { |
4c37ce86 LW |
3481 | struct gpio_chip *chip; |
3482 | int offset; | |
0f6d504e | 3483 | |
79bb71bd LW |
3484 | /* |
3485 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
3486 | * requires this function to not return zero on an invalid descriptor | |
3487 | * but rather a negative error number. | |
3488 | */ | |
bfbbe44d | 3489 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
3490 | return -EINVAL; |
3491 | ||
fdeb8e15 | 3492 | chip = desc->gdev->chip; |
372e722e | 3493 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
3494 | if (chip->to_irq) { |
3495 | int retirq = chip->to_irq(chip, offset); | |
3496 | ||
3497 | /* Zero means NO_IRQ */ | |
3498 | if (!retirq) | |
3499 | return -ENXIO; | |
3500 | ||
3501 | return retirq; | |
3502 | } | |
3503 | return -ENXIO; | |
0f6d504e | 3504 | } |
79a9becd | 3505 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 3506 | |
d468bf9e | 3507 | /** |
e3a2e878 | 3508 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
3509 | * @chip: the chip the GPIO to lock belongs to |
3510 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3511 | * |
3512 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 3513 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 3514 | */ |
e3a2e878 | 3515 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 3516 | { |
9c10280d LW |
3517 | struct gpio_desc *desc; |
3518 | ||
3519 | desc = gpiochip_get_desc(chip, offset); | |
3520 | if (IS_ERR(desc)) | |
3521 | return PTR_ERR(desc); | |
3522 | ||
60f8339e LW |
3523 | /* |
3524 | * If it's fast: flush the direction setting if something changed | |
3525 | * behind our back | |
3526 | */ | |
3527 | if (!chip->can_sleep && chip->get_direction) { | |
80956790 | 3528 | int dir = gpiod_get_direction(desc); |
9c10280d | 3529 | |
36b31279 AS |
3530 | if (dir < 0) { |
3531 | chip_err(chip, "%s: cannot get GPIO direction\n", | |
3532 | __func__); | |
3533 | return dir; | |
3534 | } | |
9c10280d | 3535 | } |
d468bf9e | 3536 | |
9c10280d | 3537 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 3538 | chip_err(chip, |
b1911710 AS |
3539 | "%s: tried to flag a GPIO set as output for IRQ\n", |
3540 | __func__); | |
d468bf9e LW |
3541 | return -EIO; |
3542 | } | |
3543 | ||
9c10280d | 3544 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
4e9439dd | 3545 | set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
3940c34a LW |
3546 | |
3547 | /* | |
3548 | * If the consumer has not set up a label (such as when the | |
3549 | * IRQ is referenced from .to_irq()) we set up a label here | |
3550 | * so it is clear this is used as an interrupt. | |
3551 | */ | |
3552 | if (!desc->label) | |
3553 | desc_set_label(desc, "interrupt"); | |
3554 | ||
d468bf9e | 3555 | return 0; |
372e722e | 3556 | } |
e3a2e878 | 3557 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 3558 | |
d468bf9e | 3559 | /** |
e3a2e878 | 3560 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
3561 | * @chip: the chip the GPIO to lock belongs to |
3562 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3563 | * |
3564 | * This is used directly by GPIO drivers that want to indicate | |
3565 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 3566 | */ |
e3a2e878 | 3567 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 3568 | { |
3940c34a LW |
3569 | struct gpio_desc *desc; |
3570 | ||
3571 | desc = gpiochip_get_desc(chip, offset); | |
3572 | if (IS_ERR(desc)) | |
d468bf9e | 3573 | return; |
d2876d08 | 3574 | |
3940c34a | 3575 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
4e9439dd | 3576 | clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
3940c34a LW |
3577 | |
3578 | /* If we only had this marking, erase it */ | |
3579 | if (desc->label && !strcmp(desc->label, "interrupt")) | |
3580 | desc_set_label(desc, NULL); | |
d468bf9e | 3581 | } |
e3a2e878 | 3582 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 3583 | |
4e9439dd HV |
3584 | void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset) |
3585 | { | |
3586 | struct gpio_desc *desc = gpiochip_get_desc(chip, offset); | |
3587 | ||
3588 | if (!IS_ERR(desc) && | |
3589 | !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) | |
3590 | clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); | |
3591 | } | |
3592 | EXPORT_SYMBOL_GPL(gpiochip_disable_irq); | |
3593 | ||
3594 | void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset) | |
3595 | { | |
3596 | struct gpio_desc *desc = gpiochip_get_desc(chip, offset); | |
3597 | ||
3598 | if (!IS_ERR(desc) && | |
3599 | !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) { | |
3600 | WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags)); | |
3601 | set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); | |
3602 | } | |
3603 | } | |
3604 | EXPORT_SYMBOL_GPL(gpiochip_enable_irq); | |
3605 | ||
6cee3821 LW |
3606 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
3607 | { | |
3608 | if (offset >= chip->ngpio) | |
3609 | return false; | |
3610 | ||
3611 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
3612 | } | |
3613 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
3614 | ||
4e6b8238 HV |
3615 | int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset) |
3616 | { | |
3617 | int ret; | |
3618 | ||
3619 | if (!try_module_get(chip->gpiodev->owner)) | |
3620 | return -ENODEV; | |
3621 | ||
3622 | ret = gpiochip_lock_as_irq(chip, offset); | |
3623 | if (ret) { | |
3624 | chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset); | |
3625 | module_put(chip->gpiodev->owner); | |
3626 | return ret; | |
3627 | } | |
3628 | return 0; | |
3629 | } | |
3630 | EXPORT_SYMBOL_GPL(gpiochip_reqres_irq); | |
3631 | ||
3632 | void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset) | |
3633 | { | |
3634 | gpiochip_unlock_as_irq(chip, offset); | |
3635 | module_put(chip->gpiodev->owner); | |
3636 | } | |
3637 | EXPORT_SYMBOL_GPL(gpiochip_relres_irq); | |
3638 | ||
143b65d6 LW |
3639 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
3640 | { | |
3641 | if (offset >= chip->ngpio) | |
3642 | return false; | |
3643 | ||
3644 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
3645 | } | |
3646 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
3647 | ||
3648 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
3649 | { | |
3650 | if (offset >= chip->ngpio) | |
3651 | return false; | |
3652 | ||
3653 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
3654 | } | |
3655 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
3656 | ||
05f479bf CK |
3657 | bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) |
3658 | { | |
3659 | if (offset >= chip->ngpio) | |
3660 | return false; | |
3661 | ||
e10f72bf | 3662 | return !test_bit(FLAG_TRANSITORY, &chip->gpiodev->descs[offset].flags); |
05f479bf CK |
3663 | } |
3664 | EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); | |
3665 | ||
79a9becd AC |
3666 | /** |
3667 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
3668 | * @desc: gpio whose value will be returned | |
3669 | * | |
3670 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 3671 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
3672 | * |
3673 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 3674 | */ |
79a9becd | 3675 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 3676 | { |
d2876d08 | 3677 | might_sleep_if(extra_checks); |
fdeb8e15 | 3678 | VALIDATE_DESC(desc); |
fac9d885 | 3679 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 3680 | } |
79a9becd | 3681 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 3682 | |
79a9becd AC |
3683 | /** |
3684 | * gpiod_get_value_cansleep() - return a gpio's value | |
3685 | * @desc: gpio whose value will be returned | |
3686 | * | |
3687 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 3688 | * account, or negative errno on failure. |
79a9becd AC |
3689 | * |
3690 | * This function is to be called from contexts that can sleep. | |
3691 | */ | |
3692 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 3693 | { |
3f397c21 | 3694 | int value; |
d2876d08 DB |
3695 | |
3696 | might_sleep_if(extra_checks); | |
fdeb8e15 | 3697 | VALIDATE_DESC(desc); |
fac9d885 | 3698 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
3699 | if (value < 0) |
3700 | return value; | |
3701 | ||
79a9becd AC |
3702 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3703 | value = !value; | |
3704 | ||
3f397c21 | 3705 | return value; |
d2876d08 | 3706 | } |
79a9becd | 3707 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 3708 | |
eec1d566 LW |
3709 | /** |
3710 | * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs | |
b9762beb | 3711 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3712 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3713 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3714 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3715 | * |
3716 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
3717 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
3718 | * else an error code. | |
3719 | * | |
3720 | * This function is to be called from contexts that can sleep. | |
3721 | */ | |
3722 | int gpiod_get_raw_array_value_cansleep(unsigned int array_size, | |
3723 | struct gpio_desc **desc_array, | |
77588c14 | 3724 | struct gpio_array *array_info, |
b9762beb | 3725 | unsigned long *value_bitmap) |
eec1d566 LW |
3726 | { |
3727 | might_sleep_if(extra_checks); | |
3728 | if (!desc_array) | |
3729 | return -EINVAL; | |
3730 | return gpiod_get_array_value_complex(true, true, array_size, | |
77588c14 JK |
3731 | desc_array, array_info, |
3732 | value_bitmap); | |
eec1d566 LW |
3733 | } |
3734 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep); | |
3735 | ||
3736 | /** | |
3737 | * gpiod_get_array_value_cansleep() - read values from an array of GPIOs | |
b9762beb | 3738 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3739 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3740 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3741 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3742 | * |
3743 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3744 | * into account. Return 0 in case of success, else an error code. | |
3745 | * | |
3746 | * This function is to be called from contexts that can sleep. | |
3747 | */ | |
3748 | int gpiod_get_array_value_cansleep(unsigned int array_size, | |
3749 | struct gpio_desc **desc_array, | |
77588c14 | 3750 | struct gpio_array *array_info, |
b9762beb | 3751 | unsigned long *value_bitmap) |
eec1d566 LW |
3752 | { |
3753 | might_sleep_if(extra_checks); | |
3754 | if (!desc_array) | |
3755 | return -EINVAL; | |
3756 | return gpiod_get_array_value_complex(false, true, array_size, | |
77588c14 JK |
3757 | desc_array, array_info, |
3758 | value_bitmap); | |
eec1d566 LW |
3759 | } |
3760 | EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep); | |
3761 | ||
79a9becd AC |
3762 | /** |
3763 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
3764 | * @desc: gpio whose value will be assigned | |
3765 | * @value: value to assign | |
3766 | * | |
3767 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
3768 | * regard for its ACTIVE_LOW status. | |
3769 | * | |
3770 | * This function is to be called from contexts that can sleep. | |
3771 | */ | |
3772 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 3773 | { |
d2876d08 | 3774 | might_sleep_if(extra_checks); |
fdeb8e15 | 3775 | VALIDATE_DESC_VOID(desc); |
fac9d885 | 3776 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 3777 | } |
79a9becd | 3778 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 3779 | |
79a9becd AC |
3780 | /** |
3781 | * gpiod_set_value_cansleep() - assign a gpio's value | |
3782 | * @desc: gpio whose value will be assigned | |
3783 | * @value: value to assign | |
3784 | * | |
3785 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
3786 | * account | |
3787 | * | |
3788 | * This function is to be called from contexts that can sleep. | |
3789 | */ | |
3790 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 3791 | { |
d2876d08 | 3792 | might_sleep_if(extra_checks); |
fdeb8e15 | 3793 | VALIDATE_DESC_VOID(desc); |
1e77fc82 | 3794 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3795 | } |
79a9becd | 3796 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 3797 | |
5f424243 | 3798 | /** |
3fff99bc | 3799 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
b9762beb | 3800 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3801 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3802 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3803 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3804 | * |
3805 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3806 | * without regard for their ACTIVE_LOW status. | |
3807 | * | |
3808 | * This function is to be called from contexts that can sleep. | |
3809 | */ | |
3027743f | 3810 | int gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
3c940660 GU |
3811 | struct gpio_desc **desc_array, |
3812 | struct gpio_array *array_info, | |
3813 | unsigned long *value_bitmap) | |
5f424243 RI |
3814 | { |
3815 | might_sleep_if(extra_checks); | |
3816 | if (!desc_array) | |
3027743f LA |
3817 | return -EINVAL; |
3818 | return gpiod_set_array_value_complex(true, true, array_size, desc_array, | |
77588c14 | 3819 | array_info, value_bitmap); |
5f424243 | 3820 | } |
3fff99bc | 3821 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 | 3822 | |
3946d187 DT |
3823 | /** |
3824 | * gpiod_add_lookup_tables() - register GPIO device consumers | |
3825 | * @tables: list of tables of consumers to register | |
3826 | * @n: number of tables in the list | |
3827 | */ | |
3828 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) | |
3829 | { | |
3830 | unsigned int i; | |
3831 | ||
3832 | mutex_lock(&gpio_lookup_lock); | |
3833 | ||
3834 | for (i = 0; i < n; i++) | |
3835 | list_add_tail(&tables[i]->list, &gpio_lookup_list); | |
3836 | ||
3837 | mutex_unlock(&gpio_lookup_lock); | |
3838 | } | |
3839 | ||
5f424243 | 3840 | /** |
3fff99bc | 3841 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
b9762beb | 3842 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3843 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3844 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3845 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3846 | * |
3847 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3848 | * into account. | |
3849 | * | |
3850 | * This function is to be called from contexts that can sleep. | |
3851 | */ | |
cf9af0d5 GU |
3852 | int gpiod_set_array_value_cansleep(unsigned int array_size, |
3853 | struct gpio_desc **desc_array, | |
3854 | struct gpio_array *array_info, | |
3855 | unsigned long *value_bitmap) | |
5f424243 RI |
3856 | { |
3857 | might_sleep_if(extra_checks); | |
3858 | if (!desc_array) | |
cf9af0d5 GU |
3859 | return -EINVAL; |
3860 | return gpiod_set_array_value_complex(false, true, array_size, | |
3861 | desc_array, array_info, | |
3862 | value_bitmap); | |
5f424243 | 3863 | } |
3fff99bc | 3864 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 3865 | |
bae48da2 | 3866 | /** |
ad824783 AC |
3867 | * gpiod_add_lookup_table() - register GPIO device consumers |
3868 | * @table: table of consumers to register | |
bae48da2 | 3869 | */ |
ad824783 | 3870 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
3871 | { |
3872 | mutex_lock(&gpio_lookup_lock); | |
3873 | ||
ad824783 | 3874 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
3875 | |
3876 | mutex_unlock(&gpio_lookup_lock); | |
3877 | } | |
226b2242 | 3878 | EXPORT_SYMBOL_GPL(gpiod_add_lookup_table); |
bae48da2 | 3879 | |
be9015ab SK |
3880 | /** |
3881 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
3882 | * @table: table of consumers to unregister | |
3883 | */ | |
3884 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
3885 | { | |
3886 | mutex_lock(&gpio_lookup_lock); | |
3887 | ||
3888 | list_del(&table->list); | |
3889 | ||
3890 | mutex_unlock(&gpio_lookup_lock); | |
3891 | } | |
226b2242 | 3892 | EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); |
be9015ab | 3893 | |
a411e81e BG |
3894 | /** |
3895 | * gpiod_add_hogs() - register a set of GPIO hogs from machine code | |
3896 | * @hogs: table of gpio hog entries with a zeroed sentinel at the end | |
3897 | */ | |
3898 | void gpiod_add_hogs(struct gpiod_hog *hogs) | |
3899 | { | |
3900 | struct gpio_chip *chip; | |
3901 | struct gpiod_hog *hog; | |
3902 | ||
3903 | mutex_lock(&gpio_machine_hogs_mutex); | |
3904 | ||
3905 | for (hog = &hogs[0]; hog->chip_label; hog++) { | |
3906 | list_add_tail(&hog->list, &gpio_machine_hogs); | |
3907 | ||
3908 | /* | |
3909 | * The chip may have been registered earlier, so check if it | |
3910 | * exists and, if so, try to hog the line now. | |
3911 | */ | |
3912 | chip = find_chip_by_name(hog->chip_label); | |
3913 | if (chip) | |
3914 | gpiochip_machine_hog(chip, hog); | |
3915 | } | |
3916 | ||
3917 | mutex_unlock(&gpio_machine_hogs_mutex); | |
3918 | } | |
3919 | EXPORT_SYMBOL_GPL(gpiod_add_hogs); | |
3920 | ||
ad824783 | 3921 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
3922 | { |
3923 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 3924 | struct gpiod_lookup_table *table; |
bae48da2 AC |
3925 | |
3926 | mutex_lock(&gpio_lookup_lock); | |
3927 | ||
ad824783 AC |
3928 | list_for_each_entry(table, &gpio_lookup_list, list) { |
3929 | if (table->dev_id && dev_id) { | |
3930 | /* | |
3931 | * Valid strings on both ends, must be identical to have | |
3932 | * a match | |
3933 | */ | |
3934 | if (!strcmp(table->dev_id, dev_id)) | |
3935 | goto found; | |
3936 | } else { | |
3937 | /* | |
3938 | * One of the pointers is NULL, so both must be to have | |
3939 | * a match | |
3940 | */ | |
3941 | if (dev_id == table->dev_id) | |
3942 | goto found; | |
3943 | } | |
3944 | } | |
3945 | table = NULL; | |
bae48da2 | 3946 | |
ad824783 AC |
3947 | found: |
3948 | mutex_unlock(&gpio_lookup_lock); | |
3949 | return table; | |
3950 | } | |
bae48da2 | 3951 | |
ad824783 | 3952 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
fed7026a | 3953 | unsigned int idx, unsigned long *flags) |
ad824783 | 3954 | { |
2a3cf6a3 | 3955 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
3956 | struct gpiod_lookup_table *table; |
3957 | struct gpiod_lookup *p; | |
bae48da2 | 3958 | |
ad824783 AC |
3959 | table = gpiod_find_lookup_table(dev); |
3960 | if (!table) | |
3961 | return desc; | |
bae48da2 | 3962 | |
ad824783 AC |
3963 | for (p = &table->table[0]; p->chip_label; p++) { |
3964 | struct gpio_chip *chip; | |
bae48da2 | 3965 | |
ad824783 | 3966 | /* idx must always match exactly */ |
bae48da2 AC |
3967 | if (p->idx != idx) |
3968 | continue; | |
3969 | ||
ad824783 AC |
3970 | /* If the lookup entry has a con_id, require exact match */ |
3971 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
3972 | continue; | |
bae48da2 | 3973 | |
ad824783 | 3974 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 3975 | |
ad824783 | 3976 | if (!chip) { |
8853daf3 JK |
3977 | /* |
3978 | * As the lookup table indicates a chip with | |
3979 | * p->chip_label should exist, assume it may | |
3980 | * still appear later and let the interested | |
3981 | * consumer be probed again or let the Deferred | |
3982 | * Probe infrastructure handle the error. | |
3983 | */ | |
3984 | dev_warn(dev, "cannot find GPIO chip %s, deferring\n", | |
3985 | p->chip_label); | |
3986 | return ERR_PTR(-EPROBE_DEFER); | |
ad824783 | 3987 | } |
bae48da2 | 3988 | |
ad824783 | 3989 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
3990 | dev_err(dev, |
3991 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
3992 | idx, chip->ngpio, chip->label); | |
3993 | return ERR_PTR(-EINVAL); | |
bae48da2 | 3994 | } |
bae48da2 | 3995 | |
bb1e88cc | 3996 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 3997 | *flags = p->flags; |
bae48da2 | 3998 | |
2a3cf6a3 | 3999 | return desc; |
bae48da2 AC |
4000 | } |
4001 | ||
bae48da2 AC |
4002 | return desc; |
4003 | } | |
4004 | ||
66858527 RI |
4005 | static int dt_gpio_count(struct device *dev, const char *con_id) |
4006 | { | |
4007 | int ret; | |
4008 | char propname[32]; | |
4009 | unsigned int i; | |
4010 | ||
4011 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
4012 | if (con_id) | |
4013 | snprintf(propname, sizeof(propname), "%s-%s", | |
4014 | con_id, gpio_suffixes[i]); | |
4015 | else | |
4016 | snprintf(propname, sizeof(propname), "%s", | |
4017 | gpio_suffixes[i]); | |
4018 | ||
4019 | ret = of_gpio_named_count(dev->of_node, propname); | |
4033d4a4 | 4020 | if (ret > 0) |
66858527 RI |
4021 | break; |
4022 | } | |
4033d4a4 | 4023 | return ret ? ret : -ENOENT; |
66858527 RI |
4024 | } |
4025 | ||
4026 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
4027 | { | |
4028 | struct gpiod_lookup_table *table; | |
4029 | struct gpiod_lookup *p; | |
4030 | unsigned int count = 0; | |
4031 | ||
4032 | table = gpiod_find_lookup_table(dev); | |
4033 | if (!table) | |
4034 | return -ENOENT; | |
4035 | ||
4036 | for (p = &table->table[0]; p->chip_label; p++) { | |
4037 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
4038 | (!con_id && !p->con_id)) | |
4039 | count++; | |
4040 | } | |
4041 | if (!count) | |
4042 | return -ENOENT; | |
4043 | ||
4044 | return count; | |
4045 | } | |
4046 | ||
4047 | /** | |
4048 | * gpiod_count - return the number of GPIOs associated with a device / function | |
4049 | * or -ENOENT if no GPIO has been assigned to the requested function | |
4050 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4051 | * @con_id: function within the GPIO consumer | |
4052 | */ | |
4053 | int gpiod_count(struct device *dev, const char *con_id) | |
4054 | { | |
4055 | int count = -ENOENT; | |
4056 | ||
4057 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
4058 | count = dt_gpio_count(dev, con_id); | |
4059 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
4060 | count = acpi_gpio_count(dev, con_id); | |
4061 | ||
4062 | if (count < 0) | |
4063 | count = platform_gpio_count(dev, con_id); | |
4064 | ||
4065 | return count; | |
4066 | } | |
4067 | EXPORT_SYMBOL_GPL(gpiod_count); | |
4068 | ||
bae48da2 | 4069 | /** |
0879162f | 4070 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 4071 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 4072 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 4073 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
4074 | * |
4075 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 4076 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 4077 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 4078 | */ |
b17d1bf1 | 4079 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 4080 | enum gpiod_flags flags) |
bae48da2 | 4081 | { |
39b2bbe3 | 4082 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 4083 | } |
b17d1bf1 | 4084 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 4085 | |
29a1f233 TR |
4086 | /** |
4087 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
4088 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4089 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 4090 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
4091 | * |
4092 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
4093 | * the requested function it will return NULL. This is convenient for drivers | |
4094 | * that need to handle optional GPIOs. | |
4095 | */ | |
b17d1bf1 | 4096 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
4097 | const char *con_id, |
4098 | enum gpiod_flags flags) | |
29a1f233 | 4099 | { |
39b2bbe3 | 4100 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 4101 | } |
b17d1bf1 | 4102 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 4103 | |
f625d460 BP |
4104 | |
4105 | /** | |
4106 | * gpiod_configure_flags - helper function to configure a given GPIO | |
4107 | * @desc: gpio whose value will be assigned | |
4108 | * @con_id: function within the GPIO consumer | |
fed7026a AS |
4109 | * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from |
4110 | * of_find_gpio() or of_get_gpio_hog() | |
f625d460 BP |
4111 | * @dflags: gpiod_flags - optional GPIO initialization flags |
4112 | * | |
4113 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
4114 | * requested function and/or index, or another IS_ERR() code if an error | |
4115 | * occurred while trying to acquire the GPIO. | |
4116 | */ | |
c29fd9eb | 4117 | int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
85b03b30 | 4118 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
4119 | { |
4120 | int status; | |
4121 | ||
85b03b30 JH |
4122 | if (lflags & GPIO_ACTIVE_LOW) |
4123 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
f926dfc1 | 4124 | |
85b03b30 JH |
4125 | if (lflags & GPIO_OPEN_DRAIN) |
4126 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
f926dfc1 LW |
4127 | else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) { |
4128 | /* | |
4129 | * This enforces open drain mode from the consumer side. | |
4130 | * This is necessary for some busses like I2C, but the lookup | |
4131 | * should *REALLY* have specified them as open drain in the | |
4132 | * first place, so print a little warning here. | |
4133 | */ | |
4134 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
4135 | gpiod_warn(desc, | |
4136 | "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n"); | |
4137 | } | |
4138 | ||
85b03b30 JH |
4139 | if (lflags & GPIO_OPEN_SOURCE) |
4140 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
e10f72bf | 4141 | |
d449991c TP |
4142 | if ((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DOWN)) { |
4143 | gpiod_err(desc, | |
4144 | "both pull-up and pull-down enabled, invalid configuration\n"); | |
4145 | return -EINVAL; | |
4146 | } | |
4147 | ||
4148 | if (lflags & GPIO_PULL_UP) | |
4149 | set_bit(FLAG_PULL_UP, &desc->flags); | |
4150 | else if (lflags & GPIO_PULL_DOWN) | |
4151 | set_bit(FLAG_PULL_DOWN, &desc->flags); | |
4152 | ||
e10f72bf AJ |
4153 | status = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY)); |
4154 | if (status < 0) | |
4155 | return status; | |
85b03b30 | 4156 | |
f625d460 BP |
4157 | /* No particular flag request, return here... */ |
4158 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
4159 | pr_debug("no flags found for %s\n", con_id); | |
4160 | return 0; | |
4161 | } | |
4162 | ||
4163 | /* Process flags */ | |
4164 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
4165 | status = gpiod_direction_output(desc, | |
ad17731d | 4166 | !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
f625d460 BP |
4167 | else |
4168 | status = gpiod_direction_input(desc); | |
4169 | ||
4170 | return status; | |
4171 | } | |
4172 | ||
bae48da2 AC |
4173 | /** |
4174 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 4175 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
4176 | * @con_id: function within the GPIO consumer |
4177 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 4178 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
4179 | * |
4180 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
4181 | * defined one for functions that define several GPIOs. | |
4182 | * | |
2a3cf6a3 AC |
4183 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
4184 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 4185 | * occurred while trying to acquire the GPIO. |
bae48da2 | 4186 | */ |
b17d1bf1 | 4187 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 4188 | const char *con_id, |
39b2bbe3 AC |
4189 | unsigned int idx, |
4190 | enum gpiod_flags flags) | |
bae48da2 | 4191 | { |
2d6c06f5 | 4192 | unsigned long lookupflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
35c5d7fd | 4193 | struct gpio_desc *desc = NULL; |
bae48da2 | 4194 | int status; |
7d18f0a1 LW |
4195 | /* Maybe we have a device name, maybe not */ |
4196 | const char *devname = dev ? dev_name(dev) : "?"; | |
bae48da2 AC |
4197 | |
4198 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
4199 | ||
4d8440b9 RW |
4200 | if (dev) { |
4201 | /* Using device tree? */ | |
4202 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
4203 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
4204 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
4205 | } else if (ACPI_COMPANION(dev)) { | |
4206 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
a31f5c3a | 4207 | desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); |
4d8440b9 | 4208 | } |
35c5d7fd AC |
4209 | } |
4210 | ||
4211 | /* | |
4212 | * Either we are not using DT or ACPI, or their lookup did not return | |
4213 | * a result. In that case, use platform lookup as a fallback. | |
4214 | */ | |
2a3cf6a3 | 4215 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 4216 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 4217 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
4218 | } |
4219 | ||
4220 | if (IS_ERR(desc)) { | |
9d5a1f2c | 4221 | dev_dbg(dev, "No GPIO consumer %s found\n", con_id); |
bae48da2 AC |
4222 | return desc; |
4223 | } | |
4224 | ||
7d18f0a1 LW |
4225 | /* |
4226 | * If a connection label was passed use that, else attempt to use | |
4227 | * the device name as label | |
4228 | */ | |
4229 | status = gpiod_request(desc, con_id ? con_id : devname); | |
b0ce7b29 LW |
4230 | if (status < 0) { |
4231 | if (status == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) { | |
4232 | /* | |
4233 | * This happens when there are several consumers for | |
4234 | * the same GPIO line: we just return here without | |
4235 | * further initialization. It is a bit if a hack. | |
4236 | * This is necessary to support fixed regulators. | |
4237 | * | |
4238 | * FIXME: Make this more sane and safe. | |
4239 | */ | |
4240 | dev_info(dev, "nonexclusive access to GPIO for %s\n", | |
4241 | con_id ? con_id : devname); | |
4242 | return desc; | |
4243 | } else { | |
4244 | return ERR_PTR(status); | |
4245 | } | |
4246 | } | |
bae48da2 | 4247 | |
85b03b30 | 4248 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
4249 | if (status < 0) { |
4250 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
4251 | gpiod_put(desc); | |
4252 | return ERR_PTR(status); | |
4253 | } | |
4254 | ||
bae48da2 AC |
4255 | return desc; |
4256 | } | |
b17d1bf1 | 4257 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 4258 | |
6392cca4 LW |
4259 | /** |
4260 | * gpiod_get_from_of_node() - obtain a GPIO from an OF node | |
4261 | * @node: handle of the OF node | |
4262 | * @propname: name of the DT property representing the GPIO | |
4263 | * @index: index of the GPIO to obtain for the consumer | |
4264 | * @dflags: GPIO initialization flags | |
4265 | * @label: label to attach to the requested GPIO | |
4266 | * | |
4267 | * Returns: | |
4268 | * On successful request the GPIO pin is configured in accordance with | |
025bf377 | 4269 | * provided @dflags. |
6392cca4 LW |
4270 | * |
4271 | * In case of error an ERR_PTR() is returned. | |
4272 | */ | |
92542edc LW |
4273 | struct gpio_desc *gpiod_get_from_of_node(struct device_node *node, |
4274 | const char *propname, int index, | |
4275 | enum gpiod_flags dflags, | |
4276 | const char *label) | |
6392cca4 | 4277 | { |
2d6c06f5 | 4278 | unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
40a3c9db | 4279 | struct gpio_desc *desc; |
6392cca4 LW |
4280 | enum of_gpio_flags flags; |
4281 | bool active_low = false; | |
4282 | bool single_ended = false; | |
4283 | bool open_drain = false; | |
4284 | bool transitory = false; | |
4285 | int ret; | |
4286 | ||
4287 | desc = of_get_named_gpiod_flags(node, propname, | |
4288 | index, &flags); | |
4289 | ||
4290 | if (!desc || IS_ERR(desc)) { | |
6392cca4 LW |
4291 | return desc; |
4292 | } | |
4293 | ||
4294 | active_low = flags & OF_GPIO_ACTIVE_LOW; | |
4295 | single_ended = flags & OF_GPIO_SINGLE_ENDED; | |
4296 | open_drain = flags & OF_GPIO_OPEN_DRAIN; | |
4297 | transitory = flags & OF_GPIO_TRANSITORY; | |
4298 | ||
4299 | ret = gpiod_request(desc, label); | |
ec757001 LW |
4300 | if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) |
4301 | return desc; | |
6392cca4 LW |
4302 | if (ret) |
4303 | return ERR_PTR(ret); | |
4304 | ||
4305 | if (active_low) | |
4306 | lflags |= GPIO_ACTIVE_LOW; | |
4307 | ||
4308 | if (single_ended) { | |
4309 | if (open_drain) | |
4310 | lflags |= GPIO_OPEN_DRAIN; | |
4311 | else | |
4312 | lflags |= GPIO_OPEN_SOURCE; | |
4313 | } | |
4314 | ||
4315 | if (transitory) | |
4316 | lflags |= GPIO_TRANSITORY; | |
4317 | ||
4318 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); | |
4319 | if (ret < 0) { | |
4320 | gpiod_put(desc); | |
4321 | return ERR_PTR(ret); | |
4322 | } | |
4323 | ||
4324 | return desc; | |
4325 | } | |
92542edc | 4326 | EXPORT_SYMBOL(gpiod_get_from_of_node); |
6392cca4 | 4327 | |
40b73183 MW |
4328 | /** |
4329 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
4330 | * @fwnode: handle of the firmware node | |
4331 | * @propname: name of the firmware property representing the GPIO | |
6392cca4 | 4332 | * @index: index of the GPIO to obtain for the consumer |
a264d10f | 4333 | * @dflags: GPIO initialization flags |
950d55f5 | 4334 | * @label: label to attach to the requested GPIO |
40b73183 MW |
4335 | * |
4336 | * This function can be used for drivers that get their configuration | |
6392cca4 | 4337 | * from opaque firmware. |
40b73183 | 4338 | * |
6392cca4 | 4339 | * The function properly finds the corresponding GPIO using whatever is the |
40b73183 MW |
4340 | * underlying firmware interface and then makes sure that the GPIO |
4341 | * descriptor is requested before it is returned to the caller. | |
4342 | * | |
950d55f5 | 4343 | * Returns: |
ff21378a | 4344 | * On successful request the GPIO pin is configured in accordance with |
a264d10f AS |
4345 | * provided @dflags. |
4346 | * | |
40b73183 MW |
4347 | * In case of error an ERR_PTR() is returned. |
4348 | */ | |
4349 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
537b94da | 4350 | const char *propname, int index, |
b2987d74 AS |
4351 | enum gpiod_flags dflags, |
4352 | const char *label) | |
40b73183 | 4353 | { |
2d6c06f5 | 4354 | unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
40b73183 | 4355 | struct gpio_desc *desc = ERR_PTR(-ENODEV); |
40b73183 MW |
4356 | int ret; |
4357 | ||
4358 | if (!fwnode) | |
4359 | return ERR_PTR(-EINVAL); | |
4360 | ||
4361 | if (is_of_node(fwnode)) { | |
6392cca4 LW |
4362 | desc = gpiod_get_from_of_node(to_of_node(fwnode), |
4363 | propname, index, | |
4364 | dflags, | |
4365 | label); | |
4366 | return desc; | |
40b73183 MW |
4367 | } else if (is_acpi_node(fwnode)) { |
4368 | struct acpi_gpio_info info; | |
4369 | ||
537b94da | 4370 | desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
6392cca4 LW |
4371 | if (IS_ERR(desc)) |
4372 | return desc; | |
40b73183 | 4373 | |
6392cca4 | 4374 | acpi_gpio_update_gpiod_flags(&dflags, &info); |
606be344 | 4375 | acpi_gpio_update_gpiod_lookup_flags(&lflags, &info); |
6392cca4 | 4376 | } |
40b73183 | 4377 | |
6392cca4 | 4378 | /* Currently only ACPI takes this path */ |
b2987d74 | 4379 | ret = gpiod_request(desc, label); |
85b03b30 JH |
4380 | if (ret) |
4381 | return ERR_PTR(ret); | |
4382 | ||
a264d10f AS |
4383 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
4384 | if (ret < 0) { | |
4385 | gpiod_put(desc); | |
4386 | return ERR_PTR(ret); | |
90b665f6 LP |
4387 | } |
4388 | ||
40b73183 MW |
4389 | return desc; |
4390 | } | |
4391 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
4392 | ||
29a1f233 TR |
4393 | /** |
4394 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
4395 | * function | |
4396 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4397 | * @con_id: function within the GPIO consumer | |
4398 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 4399 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
4400 | * |
4401 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
4402 | * specified index was assigned to the requested function it will return NULL. | |
4403 | * This is convenient for drivers that need to handle optional GPIOs. | |
4404 | */ | |
b17d1bf1 | 4405 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 4406 | const char *con_id, |
39b2bbe3 AC |
4407 | unsigned int index, |
4408 | enum gpiod_flags flags) | |
29a1f233 TR |
4409 | { |
4410 | struct gpio_desc *desc; | |
4411 | ||
39b2bbe3 | 4412 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
4413 | if (IS_ERR(desc)) { |
4414 | if (PTR_ERR(desc) == -ENOENT) | |
4415 | return NULL; | |
4416 | } | |
4417 | ||
4418 | return desc; | |
4419 | } | |
b17d1bf1 | 4420 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 4421 | |
f625d460 BP |
4422 | /** |
4423 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
4424 | * @desc: gpio whose value will be assigned | |
4425 | * @name: gpio line name | |
fed7026a AS |
4426 | * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from |
4427 | * of_find_gpio() or of_get_gpio_hog() | |
f625d460 BP |
4428 | * @dflags: gpiod_flags - optional GPIO initialization flags |
4429 | */ | |
4430 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
4431 | unsigned long lflags, enum gpiod_flags dflags) | |
4432 | { | |
4433 | struct gpio_chip *chip; | |
4434 | struct gpio_desc *local_desc; | |
4435 | int hwnum; | |
4436 | int status; | |
4437 | ||
4438 | chip = gpiod_to_chip(desc); | |
4439 | hwnum = gpio_chip_hwgpio(desc); | |
4440 | ||
5923ea6c LW |
4441 | local_desc = gpiochip_request_own_desc(chip, hwnum, name, |
4442 | lflags, dflags); | |
f625d460 | 4443 | if (IS_ERR(local_desc)) { |
c31a571d LD |
4444 | status = PTR_ERR(local_desc); |
4445 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
4446 | name, chip->label, hwnum, status); | |
4447 | return status; | |
f625d460 BP |
4448 | } |
4449 | ||
f625d460 BP |
4450 | /* Mark GPIO as hogged so it can be identified and removed later */ |
4451 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
4452 | ||
4453 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
4454 | desc_to_gpio(desc), name, | |
4455 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
4456 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
4457 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
4458 | ||
4459 | return 0; | |
4460 | } | |
4461 | ||
4462 | /** | |
4463 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
4464 | * @chip: gpio chip to act on | |
f625d460 BP |
4465 | */ |
4466 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
4467 | { | |
4468 | int id; | |
4469 | ||
4470 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
4471 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
4472 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
4473 | } |
4474 | } | |
4475 | ||
66858527 RI |
4476 | /** |
4477 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
4478 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4479 | * @con_id: function within the GPIO consumer | |
4480 | * @flags: optional GPIO initialization flags | |
4481 | * | |
4482 | * This function acquires all the GPIOs defined under a given function. | |
4483 | * | |
4484 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
4485 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
4486 | * code if an error occurred while trying to acquire the GPIOs. | |
4487 | */ | |
4488 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
4489 | const char *con_id, | |
4490 | enum gpiod_flags flags) | |
4491 | { | |
4492 | struct gpio_desc *desc; | |
4493 | struct gpio_descs *descs; | |
bf9346f5 JK |
4494 | struct gpio_array *array_info = NULL; |
4495 | struct gpio_chip *chip; | |
4496 | int count, bitmap_size; | |
66858527 RI |
4497 | |
4498 | count = gpiod_count(dev, con_id); | |
4499 | if (count < 0) | |
4500 | return ERR_PTR(count); | |
4501 | ||
acafe7e3 | 4502 | descs = kzalloc(struct_size(descs, desc, count), GFP_KERNEL); |
66858527 RI |
4503 | if (!descs) |
4504 | return ERR_PTR(-ENOMEM); | |
4505 | ||
4506 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
4507 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
4508 | if (IS_ERR(desc)) { | |
4509 | gpiod_put_array(descs); | |
4510 | return ERR_CAST(desc); | |
4511 | } | |
bf9346f5 | 4512 | |
66858527 | 4513 | descs->desc[descs->ndescs] = desc; |
bf9346f5 JK |
4514 | |
4515 | chip = gpiod_to_chip(desc); | |
4516 | /* | |
c4c958aa JK |
4517 | * If pin hardware number of array member 0 is also 0, select |
4518 | * its chip as a candidate for fast bitmap processing path. | |
bf9346f5 | 4519 | */ |
c4c958aa | 4520 | if (descs->ndescs == 0 && gpio_chip_hwgpio(desc) == 0) { |
bf9346f5 JK |
4521 | struct gpio_descs *array; |
4522 | ||
4523 | bitmap_size = BITS_TO_LONGS(chip->ngpio > count ? | |
4524 | chip->ngpio : count); | |
4525 | ||
4526 | array = kzalloc(struct_size(descs, desc, count) + | |
4527 | struct_size(array_info, invert_mask, | |
4528 | 3 * bitmap_size), GFP_KERNEL); | |
4529 | if (!array) { | |
4530 | gpiod_put_array(descs); | |
4531 | return ERR_PTR(-ENOMEM); | |
4532 | } | |
4533 | ||
4534 | memcpy(array, descs, | |
4535 | struct_size(descs, desc, descs->ndescs + 1)); | |
4536 | kfree(descs); | |
4537 | ||
4538 | descs = array; | |
4539 | array_info = (void *)(descs->desc + count); | |
4540 | array_info->get_mask = array_info->invert_mask + | |
4541 | bitmap_size; | |
4542 | array_info->set_mask = array_info->get_mask + | |
4543 | bitmap_size; | |
4544 | ||
4545 | array_info->desc = descs->desc; | |
4546 | array_info->size = count; | |
4547 | array_info->chip = chip; | |
4548 | bitmap_set(array_info->get_mask, descs->ndescs, | |
4549 | count - descs->ndescs); | |
4550 | bitmap_set(array_info->set_mask, descs->ndescs, | |
4551 | count - descs->ndescs); | |
4552 | descs->info = array_info; | |
4553 | } | |
c4c958aa JK |
4554 | /* Unmark array members which don't belong to the 'fast' chip */ |
4555 | if (array_info && array_info->chip != chip) { | |
bf9346f5 JK |
4556 | __clear_bit(descs->ndescs, array_info->get_mask); |
4557 | __clear_bit(descs->ndescs, array_info->set_mask); | |
c4c958aa JK |
4558 | } |
4559 | /* | |
4560 | * Detect array members which belong to the 'fast' chip | |
4561 | * but their pins are not in hardware order. | |
4562 | */ | |
4563 | else if (array_info && | |
4564 | gpio_chip_hwgpio(desc) != descs->ndescs) { | |
4565 | /* | |
4566 | * Don't use fast path if all array members processed so | |
4567 | * far belong to the same chip as this one but its pin | |
4568 | * hardware number is different from its array index. | |
4569 | */ | |
4570 | if (bitmap_full(array_info->get_mask, descs->ndescs)) { | |
4571 | array_info = NULL; | |
4572 | } else { | |
4573 | __clear_bit(descs->ndescs, | |
4574 | array_info->get_mask); | |
4575 | __clear_bit(descs->ndescs, | |
4576 | array_info->set_mask); | |
4577 | } | |
bf9346f5 JK |
4578 | } else if (array_info) { |
4579 | /* Exclude open drain or open source from fast output */ | |
4580 | if (gpiochip_line_is_open_drain(chip, descs->ndescs) || | |
4581 | gpiochip_line_is_open_source(chip, descs->ndescs)) | |
4582 | __clear_bit(descs->ndescs, | |
4583 | array_info->set_mask); | |
4584 | /* Identify 'fast' pins which require invertion */ | |
4585 | if (gpiod_is_active_low(desc)) | |
4586 | __set_bit(descs->ndescs, | |
4587 | array_info->invert_mask); | |
4588 | } | |
4589 | ||
66858527 RI |
4590 | descs->ndescs++; |
4591 | } | |
bf9346f5 JK |
4592 | if (array_info) |
4593 | dev_dbg(dev, | |
4594 | "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n", | |
4595 | array_info->chip->label, array_info->size, | |
4596 | *array_info->get_mask, *array_info->set_mask, | |
4597 | *array_info->invert_mask); | |
66858527 RI |
4598 | return descs; |
4599 | } | |
4600 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
4601 | ||
4602 | /** | |
4603 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
4604 | * function | |
4605 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4606 | * @con_id: function within the GPIO consumer | |
4607 | * @flags: optional GPIO initialization flags | |
4608 | * | |
4609 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
4610 | * assigned to the requested function it will return NULL. | |
4611 | */ | |
4612 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
4613 | const char *con_id, | |
4614 | enum gpiod_flags flags) | |
4615 | { | |
4616 | struct gpio_descs *descs; | |
4617 | ||
4618 | descs = gpiod_get_array(dev, con_id, flags); | |
4619 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
4620 | return NULL; | |
4621 | ||
4622 | return descs; | |
4623 | } | |
4624 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
4625 | ||
bae48da2 AC |
4626 | /** |
4627 | * gpiod_put - dispose of a GPIO descriptor | |
4628 | * @desc: GPIO descriptor to dispose of | |
4629 | * | |
4630 | * No descriptor can be used after gpiod_put() has been called on it. | |
4631 | */ | |
4632 | void gpiod_put(struct gpio_desc *desc) | |
4633 | { | |
1d7765ba AS |
4634 | if (desc) |
4635 | gpiod_free(desc); | |
372e722e | 4636 | } |
bae48da2 | 4637 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 4638 | |
66858527 RI |
4639 | /** |
4640 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
4641 | * @descs: struct gpio_descs containing an array of descriptors | |
4642 | */ | |
4643 | void gpiod_put_array(struct gpio_descs *descs) | |
4644 | { | |
4645 | unsigned int i; | |
4646 | ||
4647 | for (i = 0; i < descs->ndescs; i++) | |
4648 | gpiod_put(descs->desc[i]); | |
4649 | ||
4650 | kfree(descs); | |
4651 | } | |
4652 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
4653 | ||
3c702e99 LW |
4654 | static int __init gpiolib_dev_init(void) |
4655 | { | |
4656 | int ret; | |
4657 | ||
4658 | /* Register GPIO sysfs bus */ | |
b1911710 | 4659 | ret = bus_register(&gpio_bus_type); |
3c702e99 LW |
4660 | if (ret < 0) { |
4661 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
4662 | return ret; | |
4663 | } | |
4664 | ||
4665 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
4666 | if (ret < 0) { | |
4667 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
4668 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
4669 | } else { |
4670 | gpiolib_initialized = true; | |
4671 | gpiochip_setup_devs(); | |
3c702e99 LW |
4672 | } |
4673 | return ret; | |
4674 | } | |
4675 | core_initcall(gpiolib_dev_init); | |
4676 | ||
d2876d08 DB |
4677 | #ifdef CONFIG_DEBUG_FS |
4678 | ||
fdeb8e15 | 4679 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
4680 | { |
4681 | unsigned i; | |
fdeb8e15 LW |
4682 | struct gpio_chip *chip = gdev->chip; |
4683 | unsigned gpio = gdev->base; | |
4684 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
90fd2270 LW |
4685 | bool is_out; |
4686 | bool is_irq; | |
4687 | bool active_low; | |
d2876d08 | 4688 | |
fdeb8e15 | 4689 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
4690 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
4691 | if (gdesc->name) { | |
4692 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
4693 | gpio, gdesc->name); | |
4694 | } | |
d2876d08 | 4695 | continue; |
ced433e2 | 4696 | } |
d2876d08 | 4697 | |
372e722e | 4698 | gpiod_get_direction(gdesc); |
d2876d08 | 4699 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 4700 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
90fd2270 LW |
4701 | active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags); |
4702 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s", | |
ced433e2 | 4703 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, |
d2876d08 | 4704 | is_out ? "out" : "in ", |
1c22a252 | 4705 | chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "? ", |
90fd2270 LW |
4706 | is_irq ? "IRQ " : "", |
4707 | active_low ? "ACTIVE LOW" : ""); | |
d2876d08 DB |
4708 | seq_printf(s, "\n"); |
4709 | } | |
4710 | } | |
4711 | ||
f9c4a31f | 4712 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 4713 | { |
362432ae | 4714 | unsigned long flags; |
ff2b1359 | 4715 | struct gpio_device *gdev = NULL; |
cb1650d4 | 4716 | loff_t index = *pos; |
d2876d08 | 4717 | |
f9c4a31f | 4718 | s->private = ""; |
d2876d08 | 4719 | |
362432ae | 4720 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4721 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
4722 | if (index-- == 0) { |
4723 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 4724 | return gdev; |
f9c4a31f | 4725 | } |
362432ae | 4726 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 4727 | |
cb1650d4 | 4728 | return NULL; |
f9c4a31f TR |
4729 | } |
4730 | ||
4731 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
4732 | { | |
362432ae | 4733 | unsigned long flags; |
ff2b1359 | 4734 | struct gpio_device *gdev = v; |
f9c4a31f TR |
4735 | void *ret = NULL; |
4736 | ||
362432ae | 4737 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4738 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
4739 | ret = NULL; |
4740 | else | |
ff2b1359 | 4741 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 4742 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
4743 | |
4744 | s->private = "\n"; | |
4745 | ++*pos; | |
4746 | ||
4747 | return ret; | |
4748 | } | |
4749 | ||
4750 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
4751 | { | |
4752 | } | |
4753 | ||
4754 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
4755 | { | |
ff2b1359 LW |
4756 | struct gpio_device *gdev = v; |
4757 | struct gpio_chip *chip = gdev->chip; | |
4758 | struct device *parent; | |
4759 | ||
4760 | if (!chip) { | |
4761 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
4762 | dev_name(&gdev->dev)); | |
4763 | return 0; | |
4764 | } | |
f9c4a31f | 4765 | |
ff2b1359 LW |
4766 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
4767 | dev_name(&gdev->dev), | |
fdeb8e15 | 4768 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
4769 | parent = chip->parent; |
4770 | if (parent) | |
4771 | seq_printf(s, ", parent: %s/%s", | |
4772 | parent->bus ? parent->bus->name : "no-bus", | |
4773 | dev_name(parent)); | |
f9c4a31f TR |
4774 | if (chip->label) |
4775 | seq_printf(s, ", %s", chip->label); | |
4776 | if (chip->can_sleep) | |
4777 | seq_printf(s, ", can sleep"); | |
4778 | seq_printf(s, ":\n"); | |
4779 | ||
4780 | if (chip->dbg_show) | |
4781 | chip->dbg_show(s, chip); | |
4782 | else | |
fdeb8e15 | 4783 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 4784 | |
d2876d08 DB |
4785 | return 0; |
4786 | } | |
4787 | ||
f9c4a31f TR |
4788 | static const struct seq_operations gpiolib_seq_ops = { |
4789 | .start = gpiolib_seq_start, | |
4790 | .next = gpiolib_seq_next, | |
4791 | .stop = gpiolib_seq_stop, | |
4792 | .show = gpiolib_seq_show, | |
4793 | }; | |
4794 | ||
d2876d08 DB |
4795 | static int gpiolib_open(struct inode *inode, struct file *file) |
4796 | { | |
f9c4a31f | 4797 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
4798 | } |
4799 | ||
828c0950 | 4800 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 4801 | .owner = THIS_MODULE, |
d2876d08 DB |
4802 | .open = gpiolib_open, |
4803 | .read = seq_read, | |
4804 | .llseek = seq_lseek, | |
f9c4a31f | 4805 | .release = seq_release, |
d2876d08 DB |
4806 | }; |
4807 | ||
4808 | static int __init gpiolib_debugfs_init(void) | |
4809 | { | |
4810 | /* /sys/kernel/debug/gpio */ | |
acc68b0e GKH |
4811 | debugfs_create_file("gpio", S_IFREG | S_IRUGO, NULL, NULL, |
4812 | &gpiolib_operations); | |
d2876d08 DB |
4813 | return 0; |
4814 | } | |
4815 | subsys_initcall(gpiolib_debugfs_init); | |
4816 | ||
4817 | #endif /* DEBUG_FS */ |