Commit | Line | Data |
---|---|---|
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) | |
959 | irqflags |= IRQF_TRIGGER_RISING; | |
960 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
961 | irqflags |= IRQF_TRIGGER_FALLING; | |
962 | irqflags |= IRQF_ONESHOT; | |
61f922db LW |
963 | |
964 | INIT_KFIFO(le->events); | |
965 | init_waitqueue_head(&le->wait); | |
966 | mutex_init(&le->read_lock); | |
967 | ||
968 | /* Request a thread to read the events */ | |
969 | ret = request_threaded_irq(le->irq, | |
d58f2bf2 | 970 | lineevent_irq_handler, |
61f922db LW |
971 | lineevent_irq_thread, |
972 | irqflags, | |
973 | le->label, | |
974 | le); | |
975 | if (ret) | |
976 | goto out_free_desc; | |
977 | ||
953b956a | 978 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
61f922db LW |
979 | if (fd < 0) { |
980 | ret = fd; | |
981 | goto out_free_irq; | |
982 | } | |
983 | ||
953b956a LPC |
984 | file = anon_inode_getfile("gpio-event", |
985 | &lineevent_fileops, | |
986 | le, | |
987 | O_RDONLY | O_CLOEXEC); | |
988 | if (IS_ERR(file)) { | |
989 | ret = PTR_ERR(file); | |
990 | goto out_put_unused_fd; | |
991 | } | |
992 | ||
61f922db | 993 | eventreq.fd = fd; |
d932cd49 | 994 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
953b956a LPC |
995 | /* |
996 | * fput() will trigger the release() callback, so do not go onto | |
997 | * the regular error cleanup path here. | |
998 | */ | |
999 | fput(file); | |
1000 | put_unused_fd(fd); | |
1001 | return -EFAULT; | |
d932cd49 | 1002 | } |
61f922db | 1003 | |
953b956a LPC |
1004 | fd_install(fd, file); |
1005 | ||
61f922db LW |
1006 | return 0; |
1007 | ||
953b956a LPC |
1008 | out_put_unused_fd: |
1009 | put_unused_fd(fd); | |
61f922db LW |
1010 | out_free_irq: |
1011 | free_irq(le->irq, le); | |
1012 | out_free_desc: | |
1013 | gpiod_free(le->desc); | |
1014 | out_free_label: | |
1015 | kfree(le->label); | |
1016 | out_free_le: | |
1017 | kfree(le); | |
1018 | put_device(&gdev->dev); | |
1019 | return ret; | |
1020 | } | |
1021 | ||
950d55f5 | 1022 | /* |
3c702e99 LW |
1023 | * gpio_ioctl() - ioctl handler for the GPIO chardev |
1024 | */ | |
1025 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1026 | { | |
1027 | struct gpio_device *gdev = filp->private_data; | |
1028 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 1029 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
1030 | |
1031 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
1032 | if (!chip) | |
1033 | return -ENODEV; | |
1034 | ||
521a2ad6 | 1035 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 1036 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
1037 | struct gpiochip_info chipinfo; |
1038 | ||
0f4bbb23 LPC |
1039 | memset(&chipinfo, 0, sizeof(chipinfo)); |
1040 | ||
3c702e99 LW |
1041 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
1042 | sizeof(chipinfo.name)); | |
1043 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
1044 | strncpy(chipinfo.label, gdev->label, |
1045 | sizeof(chipinfo.label)); | |
1046 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 1047 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
1048 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
1049 | return -EFAULT; | |
1050 | return 0; | |
521a2ad6 LW |
1051 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
1052 | struct gpioline_info lineinfo; | |
1053 | struct gpio_desc *desc; | |
1054 | ||
1055 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
1056 | return -EFAULT; | |
1f1cc456 | 1057 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
1058 | return -EINVAL; |
1059 | ||
1060 | desc = &gdev->descs[lineinfo.line_offset]; | |
1061 | if (desc->name) { | |
1062 | strncpy(lineinfo.name, desc->name, | |
1063 | sizeof(lineinfo.name)); | |
1064 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
1065 | } else { | |
1066 | lineinfo.name[0] = '\0'; | |
1067 | } | |
1068 | if (desc->label) { | |
214338e3 LW |
1069 | strncpy(lineinfo.consumer, desc->label, |
1070 | sizeof(lineinfo.consumer)); | |
1071 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 1072 | } else { |
214338e3 | 1073 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
1074 | } |
1075 | ||
1076 | /* | |
1077 | * Userspace only need to know that the kernel is using | |
1078 | * this GPIO so it can't use it. | |
1079 | */ | |
1080 | lineinfo.flags = 0; | |
9d8cc89c LW |
1081 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
1082 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
1083 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
1084 | test_bit(FLAG_EXPORT, &desc->flags) || | |
1085 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 1086 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 1087 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 1088 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 1089 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 1090 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 1091 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 1092 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 1093 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
1094 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
1095 | ||
1096 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
1097 | return -EFAULT; | |
1098 | return 0; | |
d7c51b47 LW |
1099 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
1100 | return linehandle_create(gdev, ip); | |
61f922db LW |
1101 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
1102 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
1103 | } |
1104 | return -EINVAL; | |
1105 | } | |
1106 | ||
8b92e17e LW |
1107 | #ifdef CONFIG_COMPAT |
1108 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
1109 | unsigned long arg) | |
1110 | { | |
1111 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1112 | } | |
1113 | #endif | |
1114 | ||
3c702e99 LW |
1115 | /** |
1116 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
1117 | * @inode: inode for this chardev | |
1118 | * @filp: file struct for storing private data | |
1119 | * Returns 0 on success | |
1120 | */ | |
1121 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
1122 | { | |
1123 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1124 | struct gpio_device, chrdev); | |
1125 | ||
1126 | /* Fail on open if the backing gpiochip is gone */ | |
fb505747 | 1127 | if (!gdev->chip) |
3c702e99 LW |
1128 | return -ENODEV; |
1129 | get_device(&gdev->dev); | |
1130 | filp->private_data = gdev; | |
f4e81c52 LPC |
1131 | |
1132 | return nonseekable_open(inode, filp); | |
3c702e99 LW |
1133 | } |
1134 | ||
1135 | /** | |
1136 | * gpio_chrdev_release() - close chardev after ioctl operations | |
1137 | * @inode: inode for this chardev | |
1138 | * @filp: file struct for storing private data | |
1139 | * Returns 0 on success | |
1140 | */ | |
1141 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
1142 | { | |
1143 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1144 | struct gpio_device, chrdev); | |
1145 | ||
3c702e99 LW |
1146 | put_device(&gdev->dev); |
1147 | return 0; | |
1148 | } | |
1149 | ||
1150 | ||
1151 | static const struct file_operations gpio_fileops = { | |
1152 | .release = gpio_chrdev_release, | |
1153 | .open = gpio_chrdev_open, | |
1154 | .owner = THIS_MODULE, | |
f4e81c52 | 1155 | .llseek = no_llseek, |
3c702e99 | 1156 | .unlocked_ioctl = gpio_ioctl, |
8b92e17e LW |
1157 | #ifdef CONFIG_COMPAT |
1158 | .compat_ioctl = gpio_ioctl_compat, | |
1159 | #endif | |
3c702e99 LW |
1160 | }; |
1161 | ||
ff2b1359 LW |
1162 | static void gpiodevice_release(struct device *dev) |
1163 | { | |
1164 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
1165 | ||
1166 | list_del(&gdev->list); | |
1167 | ida_simple_remove(&gpio_ida, gdev->id); | |
fcf273e5 | 1168 | kfree_const(gdev->label); |
476e2fc5 | 1169 | kfree(gdev->descs); |
9efd9e69 | 1170 | kfree(gdev); |
ff2b1359 LW |
1171 | } |
1172 | ||
159f3cd9 GR |
1173 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
1174 | { | |
1175 | int status; | |
1176 | ||
1177 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
1178 | gdev->chrdev.owner = THIS_MODULE; | |
159f3cd9 | 1179 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); |
111379dc LG |
1180 | |
1181 | status = cdev_device_add(&gdev->chrdev, &gdev->dev); | |
159f3cd9 | 1182 | if (status) |
111379dc LG |
1183 | return status; |
1184 | ||
1185 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
1186 | MAJOR(gpio_devt), gdev->id); | |
159f3cd9 GR |
1187 | |
1188 | status = gpiochip_sysfs_register(gdev); | |
1189 | if (status) | |
1190 | goto err_remove_device; | |
1191 | ||
1192 | /* From this point, the .release() function cleans up gpio_device */ | |
1193 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
1194 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
1195 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
1196 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
1197 | ||
1198 | return 0; | |
1199 | ||
1200 | err_remove_device: | |
111379dc | 1201 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
159f3cd9 GR |
1202 | return status; |
1203 | } | |
1204 | ||
a411e81e BG |
1205 | static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog) |
1206 | { | |
1207 | struct gpio_desc *desc; | |
1208 | int rv; | |
1209 | ||
1210 | desc = gpiochip_get_desc(chip, hog->chip_hwnum); | |
1211 | if (IS_ERR(desc)) { | |
1212 | pr_err("%s: unable to get GPIO desc: %ld\n", | |
1213 | __func__, PTR_ERR(desc)); | |
1214 | return; | |
1215 | } | |
1216 | ||
ba3efdff | 1217 | if (test_bit(FLAG_IS_HOGGED, &desc->flags)) |
a411e81e BG |
1218 | return; |
1219 | ||
1220 | rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags); | |
1221 | if (rv) | |
1222 | pr_err("%s: unable to hog GPIO line (%s:%u): %d\n", | |
1223 | __func__, chip->label, hog->chip_hwnum, rv); | |
1224 | } | |
1225 | ||
1226 | static void machine_gpiochip_add(struct gpio_chip *chip) | |
1227 | { | |
1228 | struct gpiod_hog *hog; | |
1229 | ||
1230 | mutex_lock(&gpio_machine_hogs_mutex); | |
1231 | ||
1232 | list_for_each_entry(hog, &gpio_machine_hogs, list) { | |
1233 | if (!strcmp(chip->label, hog->chip_label)) | |
1234 | gpiochip_machine_hog(chip, hog); | |
1235 | } | |
1236 | ||
1237 | mutex_unlock(&gpio_machine_hogs_mutex); | |
1238 | } | |
1239 | ||
159f3cd9 GR |
1240 | static void gpiochip_setup_devs(void) |
1241 | { | |
1242 | struct gpio_device *gdev; | |
1243 | int err; | |
1244 | ||
1245 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1246 | err = gpiochip_setup_dev(gdev); | |
1247 | if (err) | |
1248 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1249 | dev_name(&gdev->dev), err); | |
1250 | } | |
1251 | } | |
1252 | ||
959bc7b2 | 1253 | int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, |
39c3fd58 AL |
1254 | struct lock_class_key *lock_key, |
1255 | struct lock_class_key *request_key) | |
d2876d08 DB |
1256 | { |
1257 | unsigned long flags; | |
1258 | int status = 0; | |
ff2b1359 | 1259 | unsigned i; |
8d0aab2f | 1260 | int base = chip->base; |
ff2b1359 | 1261 | struct gpio_device *gdev; |
d2876d08 | 1262 | |
ff2b1359 LW |
1263 | /* |
1264 | * First: allocate and populate the internal stat container, and | |
1265 | * set up the struct device. | |
1266 | */ | |
969f07b4 | 1267 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1268 | if (!gdev) |
14e85c0e | 1269 | return -ENOMEM; |
3c702e99 | 1270 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1271 | gdev->chip = chip; |
1272 | chip->gpiodev = gdev; | |
1273 | if (chip->parent) { | |
1274 | gdev->dev.parent = chip->parent; | |
1275 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1276 | } |
1277 | ||
ff2b1359 LW |
1278 | #ifdef CONFIG_OF_GPIO |
1279 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1280 | if (chip->of_node) |
1281 | gdev->dev.of_node = chip->of_node; | |
6ff04974 BD |
1282 | else |
1283 | chip->of_node = gdev->dev.of_node; | |
ff2b1359 | 1284 | #endif |
acc6e331 | 1285 | |
ff2b1359 LW |
1286 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1287 | if (gdev->id < 0) { | |
1288 | status = gdev->id; | |
1289 | goto err_free_gdev; | |
1290 | } | |
1291 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1292 | device_initialize(&gdev->dev); | |
1293 | dev_set_drvdata(&gdev->dev, gdev); | |
1294 | if (chip->parent && chip->parent->driver) | |
1295 | gdev->owner = chip->parent->driver->owner; | |
1296 | else if (chip->owner) | |
1297 | /* TODO: remove chip->owner */ | |
1298 | gdev->owner = chip->owner; | |
1299 | else | |
1300 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1301 | |
476e2fc5 | 1302 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1303 | if (!gdev->descs) { |
ff2b1359 | 1304 | status = -ENOMEM; |
a05a1404 | 1305 | goto err_free_ida; |
ff2b1359 LW |
1306 | } |
1307 | ||
5ed41cc4 BJZ |
1308 | if (chip->ngpio == 0) { |
1309 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1310 | status = -EINVAL; |
159f3cd9 | 1311 | goto err_free_descs; |
5ed41cc4 | 1312 | } |
df4878e9 | 1313 | |
3027743f LA |
1314 | if (chip->ngpio > FASTPATH_NGPIO) |
1315 | chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n", | |
1316 | chip->ngpio, FASTPATH_NGPIO); | |
1317 | ||
fcf273e5 | 1318 | gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL); |
df4878e9 LW |
1319 | if (!gdev->label) { |
1320 | status = -ENOMEM; | |
476e2fc5 | 1321 | goto err_free_descs; |
df4878e9 LW |
1322 | } |
1323 | ||
fdeb8e15 | 1324 | gdev->ngpio = chip->ngpio; |
43c54eca | 1325 | gdev->data = data; |
5ed41cc4 | 1326 | |
d2876d08 DB |
1327 | spin_lock_irqsave(&gpio_lock, flags); |
1328 | ||
fdeb8e15 LW |
1329 | /* |
1330 | * TODO: this allocates a Linux GPIO number base in the global | |
1331 | * GPIO numberspace for this chip. In the long run we want to | |
1332 | * get *rid* of this numberspace and use only descriptors, but | |
1333 | * it may be a pipe dream. It will not happen before we get rid | |
1334 | * of the sysfs interface anyways. | |
1335 | */ | |
8d0aab2f AV |
1336 | if (base < 0) { |
1337 | base = gpiochip_find_base(chip->ngpio); | |
1338 | if (base < 0) { | |
1339 | status = base; | |
225fce83 | 1340 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1341 | goto err_free_label; |
8d0aab2f | 1342 | } |
fdeb8e15 LW |
1343 | /* |
1344 | * TODO: it should not be necessary to reflect the assigned | |
1345 | * base outside of the GPIO subsystem. Go over drivers and | |
1346 | * see if anyone makes use of this, else drop this and assign | |
1347 | * a poison instead. | |
1348 | */ | |
8d0aab2f AV |
1349 | chip->base = base; |
1350 | } | |
fdeb8e15 | 1351 | gdev->base = base; |
8d0aab2f | 1352 | |
ff2b1359 | 1353 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1354 | if (status) { |
1355 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1356 | goto err_free_label; |
05aa5203 | 1357 | } |
1a989d0f | 1358 | |
545ebd9a LW |
1359 | spin_unlock_irqrestore(&gpio_lock, flags); |
1360 | ||
767cd17a RRD |
1361 | for (i = 0; i < chip->ngpio; i++) |
1362 | gdev->descs[i].gdev = gdev; | |
14e85c0e | 1363 | |
f23f1516 | 1364 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1365 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1366 | #endif |
1367 | ||
5f3ca732 MP |
1368 | status = gpiochip_set_desc_names(chip); |
1369 | if (status) | |
1370 | goto err_remove_from_list; | |
1371 | ||
79b804cb MW |
1372 | status = gpiochip_irqchip_init_valid_mask(chip); |
1373 | if (status) | |
1374 | goto err_remove_from_list; | |
1375 | ||
f8ec92a9 | 1376 | status = gpiochip_alloc_valid_mask(chip); |
726cb3ba SB |
1377 | if (status) |
1378 | goto err_remove_irqchip_mask; | |
1379 | ||
39c3fd58 | 1380 | status = gpiochip_add_irqchip(chip, lock_key, request_key); |
e0d89728 TR |
1381 | if (status) |
1382 | goto err_remove_chip; | |
1383 | ||
28355f81 TV |
1384 | status = of_gpiochip_add(chip); |
1385 | if (status) | |
1386 | goto err_remove_chip; | |
1387 | ||
f8ec92a9 RRD |
1388 | status = gpiochip_init_valid_mask(chip); |
1389 | if (status) | |
1390 | goto err_remove_chip; | |
1391 | ||
3edfb7bd RRD |
1392 | for (i = 0; i < chip->ngpio; i++) { |
1393 | struct gpio_desc *desc = &gdev->descs[i]; | |
1394 | ||
3edfb7bd RRD |
1395 | if (chip->get_direction && gpiochip_line_is_valid(chip, i)) |
1396 | desc->flags = !chip->get_direction(chip, i) ? | |
1397 | (1 << FLAG_IS_OUT) : 0; | |
1398 | else | |
1399 | desc->flags = !chip->direction_input ? | |
1400 | (1 << FLAG_IS_OUT) : 0; | |
1401 | } | |
1402 | ||
664e3e5a | 1403 | acpi_gpiochip_add(chip); |
391c970c | 1404 | |
a411e81e BG |
1405 | machine_gpiochip_add(chip); |
1406 | ||
3c702e99 LW |
1407 | /* |
1408 | * By first adding the chardev, and then adding the device, | |
1409 | * we get a device node entry in sysfs under | |
1410 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1411 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1412 | * We can do this only if gpiolib has been initialized. |
1413 | * Otherwise, defer until later. | |
3c702e99 | 1414 | */ |
159f3cd9 GR |
1415 | if (gpiolib_initialized) { |
1416 | status = gpiochip_setup_dev(gdev); | |
1417 | if (status) | |
1418 | goto err_remove_chip; | |
1419 | } | |
cedb1881 | 1420 | return 0; |
3bae4811 | 1421 | |
225fce83 JH |
1422 | err_remove_chip: |
1423 | acpi_gpiochip_remove(chip); | |
6d86750c | 1424 | gpiochip_free_hogs(chip); |
225fce83 | 1425 | of_gpiochip_remove(chip); |
726cb3ba SB |
1426 | gpiochip_free_valid_mask(chip); |
1427 | err_remove_irqchip_mask: | |
79b804cb | 1428 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1429 | err_remove_from_list: |
225fce83 | 1430 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1431 | list_del(&gdev->list); |
3bae4811 | 1432 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1433 | err_free_label: |
fcf273e5 | 1434 | kfree_const(gdev->label); |
476e2fc5 GR |
1435 | err_free_descs: |
1436 | kfree(gdev->descs); | |
a05a1404 | 1437 | err_free_ida: |
ff2b1359 | 1438 | ida_simple_remove(&gpio_ida, gdev->id); |
a05a1404 | 1439 | err_free_gdev: |
d2876d08 | 1440 | /* failures here can mean systems won't boot... */ |
1777fc97 | 1441 | pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__, |
fdeb8e15 | 1442 | gdev->base, gdev->base + gdev->ngpio - 1, |
1777fc97 | 1443 | chip->label ? : "generic", status); |
fdeb8e15 | 1444 | kfree(gdev); |
d2876d08 DB |
1445 | return status; |
1446 | } | |
959bc7b2 | 1447 | EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key); |
d2876d08 | 1448 | |
43c54eca LW |
1449 | /** |
1450 | * gpiochip_get_data() - get per-subdriver data for the chip | |
950d55f5 TR |
1451 | * @chip: GPIO chip |
1452 | * | |
1453 | * Returns: | |
1454 | * The per-subdriver data for the chip. | |
43c54eca LW |
1455 | */ |
1456 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1457 | { | |
1458 | return chip->gpiodev->data; | |
1459 | } | |
1460 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1461 | ||
d2876d08 DB |
1462 | /** |
1463 | * gpiochip_remove() - unregister a gpio_chip | |
1464 | * @chip: the chip to unregister | |
1465 | * | |
1466 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1467 | */ | |
e1db1706 | 1468 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1469 | { |
ff2b1359 | 1470 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1471 | struct gpio_desc *desc; |
d2876d08 | 1472 | unsigned long flags; |
1c3cdb18 | 1473 | unsigned i; |
fab28b89 | 1474 | bool requested = false; |
d2876d08 | 1475 | |
ff2b1359 | 1476 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1477 | gpiochip_sysfs_unregister(gdev); |
5018ada6 | 1478 | gpiochip_free_hogs(chip); |
bd203bd5 BJZ |
1479 | /* Numb the device, cancelling all outstanding operations */ |
1480 | gdev->chip = NULL; | |
00acc3dc | 1481 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1482 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1483 | gpiochip_remove_pin_ranges(chip); |
391c970c | 1484 | of_gpiochip_remove(chip); |
726cb3ba | 1485 | gpiochip_free_valid_mask(chip); |
43c54eca LW |
1486 | /* |
1487 | * We accept no more calls into the driver from this point, so | |
1488 | * NULL the driver data pointer | |
1489 | */ | |
1490 | gdev->data = NULL; | |
391c970c | 1491 | |
6798acaa | 1492 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1493 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1494 | desc = &gdev->descs[i]; |
fab28b89 JH |
1495 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1496 | requested = true; | |
d2876d08 | 1497 | } |
d2876d08 | 1498 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1499 | |
fab28b89 | 1500 | if (requested) |
fdeb8e15 | 1501 | dev_crit(&gdev->dev, |
58383c78 | 1502 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1503 | |
ff2b1359 LW |
1504 | /* |
1505 | * The gpiochip side puts its use of the device to rest here: | |
1506 | * if there are no userspace clients, the chardev and device will | |
1507 | * be removed, else it will be dangling until the last user is | |
1508 | * gone. | |
1509 | */ | |
111379dc | 1510 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
ff2b1359 | 1511 | put_device(&gdev->dev); |
d2876d08 DB |
1512 | } |
1513 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1514 | ||
0cf3292c LD |
1515 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1516 | { | |
1517 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1518 | ||
1519 | gpiochip_remove(chip); | |
1520 | } | |
1521 | ||
0cf3292c | 1522 | /** |
689fd02e | 1523 | * devm_gpiochip_add_data() - Resource manager gpiochip_add_data() |
3925b90f | 1524 | * @dev: pointer to the device that gpio_chip belongs to. |
0cf3292c | 1525 | * @chip: the chip to register, with chip->base initialized |
950d55f5 | 1526 | * @data: driver-private data associated with this chip |
0cf3292c | 1527 | * |
950d55f5 | 1528 | * Context: potentially before irqs will work |
0cf3292c LD |
1529 | * |
1530 | * The gpio chip automatically be released when the device is unbound. | |
950d55f5 TR |
1531 | * |
1532 | * Returns: | |
1533 | * A negative errno if the chip can't be registered, such as because the | |
1534 | * chip->base is invalid or already associated with a different chip. | |
1535 | * Otherwise it returns zero as a success code. | |
0cf3292c LD |
1536 | */ |
1537 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1538 | void *data) | |
1539 | { | |
1540 | struct gpio_chip **ptr; | |
1541 | int ret; | |
1542 | ||
1543 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1544 | GFP_KERNEL); | |
1545 | if (!ptr) | |
1546 | return -ENOMEM; | |
1547 | ||
1548 | ret = gpiochip_add_data(chip, data); | |
1549 | if (ret < 0) { | |
1550 | devres_free(ptr); | |
1551 | return ret; | |
1552 | } | |
1553 | ||
1554 | *ptr = chip; | |
1555 | devres_add(dev, ptr); | |
1556 | ||
1557 | return 0; | |
1558 | } | |
1559 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1560 | ||
594fa265 GL |
1561 | /** |
1562 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1563 | * @data: data to pass to match function | |
950d55f5 | 1564 | * @match: Callback function to check gpio_chip |
594fa265 GL |
1565 | * |
1566 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1567 | * determined by a user supplied @match callback. The callback should return | |
1568 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1569 | * non-zero, this function will return to the caller and not iterate over any | |
1570 | * more gpio_chips. | |
1571 | */ | |
07ce8ec7 | 1572 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1573 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1574 | void *data)) |
594fa265 | 1575 | { |
ff2b1359 | 1576 | struct gpio_device *gdev; |
acf06ff7 | 1577 | struct gpio_chip *chip = NULL; |
594fa265 | 1578 | unsigned long flags; |
594fa265 GL |
1579 | |
1580 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1581 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1582 | if (gdev->chip && match(gdev->chip, data)) { |
1583 | chip = gdev->chip; | |
594fa265 | 1584 | break; |
acf06ff7 | 1585 | } |
ff2b1359 | 1586 | |
594fa265 GL |
1587 | spin_unlock_irqrestore(&gpio_lock, flags); |
1588 | ||
1589 | return chip; | |
1590 | } | |
8fa0c9bf | 1591 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1592 | |
79697ef9 AC |
1593 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1594 | { | |
1595 | const char *name = data; | |
1596 | ||
1597 | return !strcmp(chip->label, name); | |
1598 | } | |
1599 | ||
1600 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1601 | { | |
1602 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1603 | } | |
1604 | ||
14250520 LW |
1605 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1606 | ||
1607 | /* | |
1608 | * The following is irqchip helper code for gpiochips. | |
1609 | */ | |
1610 | ||
79b804cb MW |
1611 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1612 | { | |
dc7b0387 | 1613 | if (!gpiochip->irq.need_valid_mask) |
79b804cb MW |
1614 | return 0; |
1615 | ||
e4371f6e | 1616 | gpiochip->irq.valid_mask = gpiochip_allocate_mask(gpiochip); |
dc7b0387 | 1617 | if (!gpiochip->irq.valid_mask) |
79b804cb MW |
1618 | return -ENOMEM; |
1619 | ||
79b804cb MW |
1620 | return 0; |
1621 | } | |
1622 | ||
1623 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1624 | { | |
dc7b0387 TR |
1625 | kfree(gpiochip->irq.valid_mask); |
1626 | gpiochip->irq.valid_mask = NULL; | |
79b804cb MW |
1627 | } |
1628 | ||
64ff2c8e SB |
1629 | bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, |
1630 | unsigned int offset) | |
79b804cb | 1631 | { |
726cb3ba SB |
1632 | if (!gpiochip_line_is_valid(gpiochip, offset)) |
1633 | return false; | |
79b804cb | 1634 | /* No mask means all valid */ |
dc7b0387 | 1635 | if (likely(!gpiochip->irq.valid_mask)) |
79b804cb | 1636 | return true; |
dc7b0387 | 1637 | return test_bit(offset, gpiochip->irq.valid_mask); |
79b804cb | 1638 | } |
64ff2c8e | 1639 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid); |
79b804cb | 1640 | |
14250520 | 1641 | /** |
d245b3f9 | 1642 | * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip |
3f97d5fc | 1643 | * @gpiochip: the gpiochip to set the irqchip chain to |
14250520 LW |
1644 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1645 | * chained irqchip | |
1646 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1647 | * coming out of the gpiochip. If the interrupt is nested rather than |
1648 | * cascaded, pass NULL in this handler argument | |
14250520 | 1649 | */ |
d245b3f9 | 1650 | static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, |
6f79309a | 1651 | unsigned int parent_irq, |
d245b3f9 | 1652 | irq_flow_handler_t parent_handler) |
14250520 | 1653 | { |
f0fbe7bc | 1654 | if (!gpiochip->irq.domain) { |
83141a77 LW |
1655 | chip_err(gpiochip, "called %s before setting up irqchip\n", |
1656 | __func__); | |
1c8732bb LW |
1657 | return; |
1658 | } | |
1659 | ||
3f97d5fc LW |
1660 | if (parent_handler) { |
1661 | if (gpiochip->can_sleep) { | |
1662 | chip_err(gpiochip, | |
b1911710 | 1663 | "you cannot have chained interrupts on a chip that may sleep\n"); |
3f97d5fc LW |
1664 | return; |
1665 | } | |
3f97d5fc LW |
1666 | /* |
1667 | * The parent irqchip is already using the chip_data for this | |
1668 | * irqchip, so our callbacks simply use the handler_data. | |
1669 | */ | |
f7f87753 TG |
1670 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1671 | gpiochip); | |
25e4fe92 | 1672 | |
3e779a2e SB |
1673 | gpiochip->irq.parent_irq = parent_irq; |
1674 | gpiochip->irq.parents = &gpiochip->irq.parent_irq; | |
39e5f096 | 1675 | gpiochip->irq.num_parents = 1; |
3f97d5fc | 1676 | } |
14250520 | 1677 | } |
d245b3f9 LW |
1678 | |
1679 | /** | |
1680 | * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip | |
1681 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1682 | * @irqchip: the irqchip to chain to the gpiochip | |
1683 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1684 | * chained irqchip | |
1685 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
40f5ff4f | 1686 | * coming out of the gpiochip. |
d245b3f9 LW |
1687 | */ |
1688 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1689 | struct irq_chip *irqchip, | |
6f79309a | 1690 | unsigned int parent_irq, |
d245b3f9 LW |
1691 | irq_flow_handler_t parent_handler) |
1692 | { | |
60ed54ca TR |
1693 | if (gpiochip->irq.threaded) { |
1694 | chip_err(gpiochip, "tried to chain a threaded gpiochip\n"); | |
1695 | return; | |
1696 | } | |
1697 | ||
3c1f6b2d | 1698 | gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, parent_handler); |
d245b3f9 | 1699 | } |
14250520 LW |
1700 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); |
1701 | ||
d245b3f9 LW |
1702 | /** |
1703 | * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip | |
1704 | * @gpiochip: the gpiochip to set the irqchip nested handler to | |
1705 | * @irqchip: the irqchip to nest to the gpiochip | |
1706 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1707 | * nested irqchip | |
1708 | */ | |
1709 | void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, | |
1710 | struct irq_chip *irqchip, | |
6f79309a | 1711 | unsigned int parent_irq) |
d245b3f9 | 1712 | { |
3c1f6b2d | 1713 | gpiochip_set_cascaded_irqchip(gpiochip, parent_irq, NULL); |
d245b3f9 LW |
1714 | } |
1715 | EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); | |
1716 | ||
14250520 LW |
1717 | /** |
1718 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1719 | * @d: the irqdomain used by this irqchip | |
1720 | * @irq: the global irq number used by this GPIO irqchip irq | |
1721 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1722 | * | |
1723 | * This function will set up the mapping for a certain IRQ line on a | |
1724 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1725 | * stored inside the gpiochip. | |
1726 | */ | |
1b95b4eb TR |
1727 | int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, |
1728 | irq_hw_number_t hwirq) | |
14250520 LW |
1729 | { |
1730 | struct gpio_chip *chip = d->host_data; | |
e0d89728 | 1731 | int err = 0; |
14250520 | 1732 | |
dc749a09 GS |
1733 | if (!gpiochip_irqchip_irq_valid(chip, hwirq)) |
1734 | return -ENXIO; | |
1735 | ||
14250520 | 1736 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1737 | /* |
1738 | * This lock class tells lockdep that GPIO irqs are in a different | |
1739 | * category than their parents, so it won't report false recursion. | |
1740 | */ | |
39c3fd58 | 1741 | irq_set_lockdep_class(irq, chip->irq.lock_key, chip->irq.request_key); |
c7a0aa59 | 1742 | irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler); |
d245b3f9 | 1743 | /* Chips that use nested thread handlers have them marked */ |
60ed54ca | 1744 | if (chip->irq.threaded) |
1c8732bb | 1745 | irq_set_nested_thread(irq, 1); |
14250520 | 1746 | irq_set_noprobe(irq); |
23393d49 | 1747 | |
e0d89728 TR |
1748 | if (chip->irq.num_parents == 1) |
1749 | err = irq_set_parent(irq, chip->irq.parents[0]); | |
1750 | else if (chip->irq.map) | |
1751 | err = irq_set_parent(irq, chip->irq.map[hwirq]); | |
1752 | ||
1753 | if (err < 0) | |
1754 | return err; | |
1755 | ||
1333b90f LW |
1756 | /* |
1757 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1758 | * is passed as default type. | |
1759 | */ | |
3634eeb0 TR |
1760 | if (chip->irq.default_type != IRQ_TYPE_NONE) |
1761 | irq_set_irq_type(irq, chip->irq.default_type); | |
14250520 LW |
1762 | |
1763 | return 0; | |
1764 | } | |
1b95b4eb | 1765 | EXPORT_SYMBOL_GPL(gpiochip_irq_map); |
14250520 | 1766 | |
1b95b4eb | 1767 | void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
c3626fde | 1768 | { |
1c8732bb LW |
1769 | struct gpio_chip *chip = d->host_data; |
1770 | ||
60ed54ca | 1771 | if (chip->irq.threaded) |
1c8732bb | 1772 | irq_set_nested_thread(irq, 0); |
c3626fde LW |
1773 | irq_set_chip_and_handler(irq, NULL, NULL); |
1774 | irq_set_chip_data(irq, NULL); | |
1775 | } | |
1b95b4eb | 1776 | EXPORT_SYMBOL_GPL(gpiochip_irq_unmap); |
c3626fde | 1777 | |
14250520 LW |
1778 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1779 | .map = gpiochip_irq_map, | |
c3626fde | 1780 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1781 | /* Virtually all GPIO irqchips are twocell:ed */ |
1782 | .xlate = irq_domain_xlate_twocell, | |
1783 | }; | |
1784 | ||
ef74f70e BM |
1785 | /** |
1786 | * gpiochip_irq_domain_activate() - Lock a GPIO to be used as an IRQ | |
1787 | * @domain: The IRQ domain used by this IRQ chip | |
1788 | * @data: Outermost irq_data associated with the IRQ | |
1789 | * @reserve: If set, only reserve an interrupt vector instead of assigning one | |
1790 | * | |
1791 | * This function is a wrapper that calls gpiochip_lock_as_irq() and is to be | |
1792 | * used as the activate function for the &struct irq_domain_ops. The host_data | |
1793 | * for the IRQ domain must be the &struct gpio_chip. | |
1794 | */ | |
1795 | int gpiochip_irq_domain_activate(struct irq_domain *domain, | |
1796 | struct irq_data *data, bool reserve) | |
1797 | { | |
1798 | struct gpio_chip *chip = domain->host_data; | |
1799 | ||
1800 | return gpiochip_lock_as_irq(chip, data->hwirq); | |
1801 | } | |
1802 | EXPORT_SYMBOL_GPL(gpiochip_irq_domain_activate); | |
1803 | ||
1804 | /** | |
1805 | * gpiochip_irq_domain_deactivate() - Unlock a GPIO used as an IRQ | |
1806 | * @domain: The IRQ domain used by this IRQ chip | |
1807 | * @data: Outermost irq_data associated with the IRQ | |
1808 | * | |
1809 | * This function is a wrapper that will call gpiochip_unlock_as_irq() and is to | |
1810 | * be used as the deactivate function for the &struct irq_domain_ops. The | |
1811 | * host_data for the IRQ domain must be the &struct gpio_chip. | |
1812 | */ | |
1813 | void gpiochip_irq_domain_deactivate(struct irq_domain *domain, | |
1814 | struct irq_data *data) | |
1815 | { | |
1816 | struct gpio_chip *chip = domain->host_data; | |
1817 | ||
1818 | return gpiochip_unlock_as_irq(chip, data->hwirq); | |
1819 | } | |
1820 | EXPORT_SYMBOL_GPL(gpiochip_irq_domain_deactivate); | |
1821 | ||
4e6b8238 | 1822 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) |
14250520 | 1823 | { |
4e6b8238 HV |
1824 | if (!gpiochip_irqchip_irq_valid(chip, offset)) |
1825 | return -ENXIO; | |
5b76e79c | 1826 | |
4e6b8238 | 1827 | return irq_create_mapping(chip->irq.domain, offset); |
14250520 LW |
1828 | } |
1829 | ||
14250520 LW |
1830 | static int gpiochip_irq_reqres(struct irq_data *d) |
1831 | { | |
1832 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
5b76e79c | 1833 | |
4e6b8238 | 1834 | return gpiochip_reqres_irq(chip, d->hwirq); |
14250520 LW |
1835 | } |
1836 | ||
1837 | static void gpiochip_irq_relres(struct irq_data *d) | |
1838 | { | |
1839 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1840 | ||
4e6b8238 | 1841 | gpiochip_relres_irq(chip, d->hwirq); |
14250520 LW |
1842 | } |
1843 | ||
461c1a7d | 1844 | static void gpiochip_irq_enable(struct irq_data *d) |
14250520 | 1845 | { |
461c1a7d | 1846 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
e0d89728 | 1847 | |
461c1a7d HV |
1848 | gpiochip_enable_irq(chip, d->hwirq); |
1849 | if (chip->irq.irq_enable) | |
1850 | chip->irq.irq_enable(d); | |
1851 | else | |
1852 | chip->irq.chip->irq_unmask(d); | |
1853 | } | |
1854 | ||
1855 | static void gpiochip_irq_disable(struct irq_data *d) | |
1856 | { | |
1857 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1858 | ||
1859 | if (chip->irq.irq_disable) | |
1860 | chip->irq.irq_disable(d); | |
1861 | else | |
1862 | chip->irq.chip->irq_mask(d); | |
1863 | gpiochip_disable_irq(chip, d->hwirq); | |
1864 | } | |
1865 | ||
ca620f2d HV |
1866 | static void gpiochip_set_irq_hooks(struct gpio_chip *gpiochip) |
1867 | { | |
1868 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1869 | ||
1870 | if (!irqchip->irq_request_resources && | |
1871 | !irqchip->irq_release_resources) { | |
1872 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1873 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1874 | } | |
461c1a7d HV |
1875 | if (WARN_ON(gpiochip->irq.irq_enable)) |
1876 | return; | |
171948ea HV |
1877 | /* Check if the irqchip already has this hook... */ |
1878 | if (irqchip->irq_enable == gpiochip_irq_enable) { | |
1879 | /* | |
1880 | * ...and if so, give a gentle warning that this is bad | |
1881 | * practice. | |
1882 | */ | |
1883 | chip_info(gpiochip, | |
1884 | "detected irqchip that is shared with multiple gpiochips: please fix the driver.\n"); | |
1885 | return; | |
1886 | } | |
461c1a7d HV |
1887 | gpiochip->irq.irq_enable = irqchip->irq_enable; |
1888 | gpiochip->irq.irq_disable = irqchip->irq_disable; | |
1889 | irqchip->irq_enable = gpiochip_irq_enable; | |
1890 | irqchip->irq_disable = gpiochip_irq_disable; | |
14250520 LW |
1891 | } |
1892 | ||
e0d89728 TR |
1893 | /** |
1894 | * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip | |
1895 | * @gpiochip: the GPIO chip to add the IRQ chip to | |
39c3fd58 AL |
1896 | * @lock_key: lockdep class for IRQ lock |
1897 | * @request_key: lockdep class for IRQ request | |
e0d89728 | 1898 | */ |
959bc7b2 | 1899 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
1900 | struct lock_class_key *lock_key, |
1901 | struct lock_class_key *request_key) | |
e0d89728 TR |
1902 | { |
1903 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1904 | const struct irq_domain_ops *ops; | |
1905 | struct device_node *np; | |
1906 | unsigned int type; | |
1907 | unsigned int i; | |
1908 | ||
1909 | if (!irqchip) | |
1910 | return 0; | |
1911 | ||
1912 | if (gpiochip->irq.parent_handler && gpiochip->can_sleep) { | |
b1911710 | 1913 | chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n"); |
e0d89728 TR |
1914 | return -EINVAL; |
1915 | } | |
1916 | ||
1917 | np = gpiochip->gpiodev->dev.of_node; | |
1918 | type = gpiochip->irq.default_type; | |
1919 | ||
1920 | /* | |
1921 | * Specifying a default trigger is a terrible idea if DT or ACPI is | |
1922 | * used to configure the interrupts, as you may end up with | |
1923 | * conflicting triggers. Tell the user, and reset to NONE. | |
1924 | */ | |
1925 | if (WARN(np && type != IRQ_TYPE_NONE, | |
1926 | "%s: Ignoring %u default trigger\n", np->full_name, type)) | |
1927 | type = IRQ_TYPE_NONE; | |
1928 | ||
1929 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { | |
1930 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1931 | "Ignoring %u default trigger\n", type); | |
1932 | type = IRQ_TYPE_NONE; | |
1933 | } | |
1934 | ||
1935 | gpiochip->to_irq = gpiochip_to_irq; | |
1936 | gpiochip->irq.default_type = type; | |
959bc7b2 | 1937 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 1938 | gpiochip->irq.request_key = request_key; |
e0d89728 TR |
1939 | |
1940 | if (gpiochip->irq.domain_ops) | |
1941 | ops = gpiochip->irq.domain_ops; | |
1942 | else | |
1943 | ops = &gpiochip_domain_ops; | |
1944 | ||
1945 | gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio, | |
8302cf58 TR |
1946 | gpiochip->irq.first, |
1947 | ops, gpiochip); | |
e0d89728 TR |
1948 | if (!gpiochip->irq.domain) |
1949 | return -EINVAL; | |
1950 | ||
e0d89728 TR |
1951 | if (gpiochip->irq.parent_handler) { |
1952 | void *data = gpiochip->irq.parent_handler_data ?: gpiochip; | |
1953 | ||
1954 | for (i = 0; i < gpiochip->irq.num_parents; i++) { | |
1955 | /* | |
1956 | * The parent IRQ chip is already using the chip_data | |
1957 | * for this IRQ chip, so our callbacks simply use the | |
1958 | * handler_data. | |
1959 | */ | |
1960 | irq_set_chained_handler_and_data(gpiochip->irq.parents[i], | |
1961 | gpiochip->irq.parent_handler, | |
1962 | data); | |
1963 | } | |
e0d89728 TR |
1964 | } |
1965 | ||
ca620f2d HV |
1966 | gpiochip_set_irq_hooks(gpiochip); |
1967 | ||
e0d89728 TR |
1968 | acpi_gpiochip_request_interrupts(gpiochip); |
1969 | ||
1970 | return 0; | |
1971 | } | |
1972 | ||
14250520 LW |
1973 | /** |
1974 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1975 | * @gpiochip: the gpiochip to remove the irqchip from | |
1976 | * | |
1977 | * This is called only from gpiochip_remove() | |
1978 | */ | |
1979 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1980 | { | |
ca620f2d | 1981 | struct irq_chip *irqchip = gpiochip->irq.chip; |
39e5f096 | 1982 | unsigned int offset; |
c3626fde | 1983 | |
afa82fab MW |
1984 | acpi_gpiochip_free_interrupts(gpiochip); |
1985 | ||
ca620f2d | 1986 | if (irqchip && gpiochip->irq.parent_handler) { |
39e5f096 TR |
1987 | struct gpio_irq_chip *irq = &gpiochip->irq; |
1988 | unsigned int i; | |
1989 | ||
1990 | for (i = 0; i < irq->num_parents; i++) | |
1991 | irq_set_chained_handler_and_data(irq->parents[i], | |
1992 | NULL, NULL); | |
25e4fe92 DES |
1993 | } |
1994 | ||
c3626fde | 1995 | /* Remove all IRQ mappings and delete the domain */ |
f0fbe7bc | 1996 | if (gpiochip->irq.domain) { |
39e5f096 TR |
1997 | unsigned int irq; |
1998 | ||
79b804cb MW |
1999 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
2000 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
2001 | continue; | |
f0fbe7bc TR |
2002 | |
2003 | irq = irq_find_mapping(gpiochip->irq.domain, offset); | |
2004 | irq_dispose_mapping(irq); | |
79b804cb | 2005 | } |
f0fbe7bc TR |
2006 | |
2007 | irq_domain_remove(gpiochip->irq.domain); | |
c3626fde | 2008 | } |
14250520 | 2009 | |
461c1a7d HV |
2010 | if (irqchip) { |
2011 | if (irqchip->irq_request_resources == gpiochip_irq_reqres) { | |
2012 | irqchip->irq_request_resources = NULL; | |
2013 | irqchip->irq_release_resources = NULL; | |
2014 | } | |
2015 | if (irqchip->irq_enable == gpiochip_irq_enable) { | |
2016 | irqchip->irq_enable = gpiochip->irq.irq_enable; | |
2017 | irqchip->irq_disable = gpiochip->irq.irq_disable; | |
2018 | } | |
14250520 | 2019 | } |
461c1a7d HV |
2020 | gpiochip->irq.irq_enable = NULL; |
2021 | gpiochip->irq.irq_disable = NULL; | |
ca620f2d | 2022 | gpiochip->irq.chip = NULL; |
79b804cb MW |
2023 | |
2024 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
2025 | } |
2026 | ||
2027 | /** | |
739e6f59 | 2028 | * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip |
14250520 LW |
2029 | * @gpiochip: the gpiochip to add the irqchip to |
2030 | * @irqchip: the irqchip to add to the gpiochip | |
2031 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
2032 | * allocate gpiochip irqs from | |
2033 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
2034 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
2035 | * to have the core avoid setting up any default type in the hardware. | |
60ed54ca | 2036 | * @threaded: whether this irqchip uses a nested thread handler |
39c3fd58 AL |
2037 | * @lock_key: lockdep class for IRQ lock |
2038 | * @request_key: lockdep class for IRQ request | |
14250520 LW |
2039 | * |
2040 | * This function closely associates a certain irqchip with a certain | |
2041 | * gpiochip, providing an irq domain to translate the local IRQs to | |
2042 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
2043 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 2044 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
2045 | * from the gpiochip passed as chip data. An irqdomain will be stored |
2046 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
2047 | * translation. The gpiochip will need to be initialized and registered | |
2048 | * before calling this function. | |
2049 | * | |
c3626fde LW |
2050 | * This function will handle two cell:ed simple IRQs and assumes all |
2051 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
2052 | * need to be open coded. |
2053 | */ | |
739e6f59 LW |
2054 | int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, |
2055 | struct irq_chip *irqchip, | |
2056 | unsigned int first_irq, | |
2057 | irq_flow_handler_t handler, | |
2058 | unsigned int type, | |
60ed54ca | 2059 | bool threaded, |
39c3fd58 AL |
2060 | struct lock_class_key *lock_key, |
2061 | struct lock_class_key *request_key) | |
14250520 LW |
2062 | { |
2063 | struct device_node *of_node; | |
14250520 LW |
2064 | |
2065 | if (!gpiochip || !irqchip) | |
2066 | return -EINVAL; | |
2067 | ||
58383c78 | 2068 | if (!gpiochip->parent) { |
14250520 LW |
2069 | pr_err("missing gpiochip .dev parent pointer\n"); |
2070 | return -EINVAL; | |
2071 | } | |
60ed54ca | 2072 | gpiochip->irq.threaded = threaded; |
58383c78 | 2073 | of_node = gpiochip->parent->of_node; |
14250520 LW |
2074 | #ifdef CONFIG_OF_GPIO |
2075 | /* | |
20a8a968 | 2076 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
2077 | * FIXME: get rid of this and use gpiochip->parent->of_node |
2078 | * everywhere | |
14250520 LW |
2079 | */ |
2080 | if (gpiochip->of_node) | |
2081 | of_node = gpiochip->of_node; | |
2082 | #endif | |
332e99d5 | 2083 | /* |
0a1e0053 | 2084 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
2085 | * used to configure the interrupts, as you may end-up with |
2086 | * conflicting triggers. Tell the user, and reset to NONE. | |
2087 | */ | |
2088 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
7eb6ce2f | 2089 | "%pOF: Ignoring %d default trigger\n", of_node, type)) |
332e99d5 | 2090 | type = IRQ_TYPE_NONE; |
0a1e0053 MW |
2091 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
2092 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
2093 | "Ignoring %d default trigger\n", type); | |
2094 | type = IRQ_TYPE_NONE; | |
2095 | } | |
332e99d5 | 2096 | |
da80ff81 | 2097 | gpiochip->irq.chip = irqchip; |
c7a0aa59 | 2098 | gpiochip->irq.handler = handler; |
3634eeb0 | 2099 | gpiochip->irq.default_type = type; |
14250520 | 2100 | gpiochip->to_irq = gpiochip_to_irq; |
ca9df053 | 2101 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 2102 | gpiochip->irq.request_key = request_key; |
f0fbe7bc | 2103 | gpiochip->irq.domain = irq_domain_add_simple(of_node, |
14250520 LW |
2104 | gpiochip->ngpio, first_irq, |
2105 | &gpiochip_domain_ops, gpiochip); | |
f0fbe7bc | 2106 | if (!gpiochip->irq.domain) { |
da80ff81 | 2107 | gpiochip->irq.chip = NULL; |
14250520 LW |
2108 | return -EINVAL; |
2109 | } | |
8b67a1f0 | 2110 | |
ca620f2d | 2111 | gpiochip_set_irq_hooks(gpiochip); |
14250520 | 2112 | |
afa82fab MW |
2113 | acpi_gpiochip_request_interrupts(gpiochip); |
2114 | ||
14250520 LW |
2115 | return 0; |
2116 | } | |
739e6f59 | 2117 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); |
14250520 LW |
2118 | |
2119 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
2120 | ||
959bc7b2 | 2121 | static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
2122 | struct lock_class_key *lock_key, |
2123 | struct lock_class_key *request_key) | |
e0d89728 TR |
2124 | { |
2125 | return 0; | |
2126 | } | |
2127 | ||
14250520 | 2128 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} |
79b804cb MW |
2129 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
2130 | { | |
2131 | return 0; | |
2132 | } | |
2133 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
2134 | { } | |
14250520 LW |
2135 | |
2136 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
2137 | ||
c771c2f4 JG |
2138 | /** |
2139 | * gpiochip_generic_request() - request the gpio function for a pin | |
2140 | * @chip: the gpiochip owning the GPIO | |
2141 | * @offset: the offset of the GPIO to request for GPIO function | |
2142 | */ | |
2143 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
2144 | { | |
a9a1d2a7 | 2145 | return pinctrl_gpio_request(chip->gpiodev->base + offset); |
c771c2f4 JG |
2146 | } |
2147 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
2148 | ||
2149 | /** | |
2150 | * gpiochip_generic_free() - free the gpio function from a pin | |
2151 | * @chip: the gpiochip to request the gpio function for | |
2152 | * @offset: the offset of the GPIO to free from GPIO function | |
2153 | */ | |
2154 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
2155 | { | |
a9a1d2a7 | 2156 | pinctrl_gpio_free(chip->gpiodev->base + offset); |
c771c2f4 JG |
2157 | } |
2158 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
2159 | ||
2956b5d9 MW |
2160 | /** |
2161 | * gpiochip_generic_config() - apply configuration for a pin | |
2162 | * @chip: the gpiochip owning the GPIO | |
2163 | * @offset: the offset of the GPIO to apply the configuration | |
2164 | * @config: the configuration to be applied | |
2165 | */ | |
2166 | int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, | |
2167 | unsigned long config) | |
2168 | { | |
2169 | return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); | |
2170 | } | |
2171 | EXPORT_SYMBOL_GPL(gpiochip_generic_config); | |
2172 | ||
f23f1516 | 2173 | #ifdef CONFIG_PINCTRL |
165adc9c | 2174 | |
586a87e6 CR |
2175 | /** |
2176 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
2177 | * @chip: the gpiochip to add the range for | |
d32651f6 | 2178 | * @pctldev: the pin controller to map to |
586a87e6 CR |
2179 | * @gpio_offset: the start offset in the current gpio_chip number space |
2180 | * @pin_group: name of the pin group inside the pin controller | |
973c1714 CL |
2181 | * |
2182 | * Calling this function directly from a DeviceTree-supported | |
2183 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2184 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2185 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
586a87e6 CR |
2186 | */ |
2187 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
2188 | struct pinctrl_dev *pctldev, | |
2189 | unsigned int gpio_offset, const char *pin_group) | |
2190 | { | |
2191 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2192 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
2193 | int ret; |
2194 | ||
2195 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
2196 | if (!pin_range) { | |
1a2a99c6 | 2197 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
2198 | return -ENOMEM; |
2199 | } | |
2200 | ||
2201 | /* Use local offset as range ID */ | |
2202 | pin_range->range.id = gpio_offset; | |
2203 | pin_range->range.gc = chip; | |
2204 | pin_range->range.name = chip->label; | |
fdeb8e15 | 2205 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
2206 | pin_range->pctldev = pctldev; |
2207 | ||
2208 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
2209 | &pin_range->range.pins, | |
2210 | &pin_range->range.npins); | |
61c6375d MN |
2211 | if (ret < 0) { |
2212 | kfree(pin_range); | |
586a87e6 | 2213 | return ret; |
61c6375d | 2214 | } |
586a87e6 CR |
2215 | |
2216 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
2217 | ||
1a2a99c6 AS |
2218 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
2219 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
2220 | pinctrl_dev_get_devname(pctldev), pin_group); |
2221 | ||
20ec3e39 | 2222 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
2223 | |
2224 | return 0; | |
2225 | } | |
2226 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
2227 | ||
3f0f8670 LW |
2228 | /** |
2229 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
2230 | * @chip: the gpiochip to add the range for | |
950d55f5 | 2231 | * @pinctl_name: the dev_name() of the pin controller to map to |
316511c0 LW |
2232 | * @gpio_offset: the start offset in the current gpio_chip number space |
2233 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
2234 | * @npins: the number of pins from the offset of each pin space (GPIO and |
2235 | * pin controller) to accumulate in this range | |
950d55f5 TR |
2236 | * |
2237 | * Returns: | |
2238 | * 0 on success, or a negative error-code on failure. | |
973c1714 CL |
2239 | * |
2240 | * Calling this function directly from a DeviceTree-supported | |
2241 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2242 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2243 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
3f0f8670 | 2244 | */ |
1e63d7b9 | 2245 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 2246 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 2247 | unsigned int npins) |
f23f1516 SH |
2248 | { |
2249 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2250 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 2251 | int ret; |
f23f1516 | 2252 | |
3f0f8670 | 2253 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 2254 | if (!pin_range) { |
1a2a99c6 | 2255 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 2256 | return -ENOMEM; |
f23f1516 SH |
2257 | } |
2258 | ||
3f0f8670 | 2259 | /* Use local offset as range ID */ |
316511c0 | 2260 | pin_range->range.id = gpio_offset; |
3f0f8670 | 2261 | pin_range->range.gc = chip; |
f23f1516 | 2262 | pin_range->range.name = chip->label; |
fdeb8e15 | 2263 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 2264 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 2265 | pin_range->range.npins = npins; |
192c369c | 2266 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 2267 | &pin_range->range); |
8f23ca1a | 2268 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 2269 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 2270 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 2271 | kfree(pin_range); |
b4d4b1f0 | 2272 | return ret; |
3f0f8670 | 2273 | } |
1a2a99c6 AS |
2274 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
2275 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
2276 | pinctl_name, |
2277 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 2278 | |
20ec3e39 | 2279 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
2280 | |
2281 | return 0; | |
f23f1516 | 2282 | } |
165adc9c | 2283 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 2284 | |
3f0f8670 LW |
2285 | /** |
2286 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
2287 | * @chip: the chip to remove all the mappings for | |
2288 | */ | |
f23f1516 SH |
2289 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
2290 | { | |
2291 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 2292 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 2293 | |
20ec3e39 | 2294 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
2295 | list_del(&pin_range->node); |
2296 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
2297 | &pin_range->range); | |
3f0f8670 | 2298 | kfree(pin_range); |
f23f1516 SH |
2299 | } |
2300 | } | |
165adc9c LW |
2301 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
2302 | ||
2303 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 2304 | |
d2876d08 DB |
2305 | /* These "optional" allocation calls help prevent drivers from stomping |
2306 | * on each other, and help provide better diagnostics in debugfs. | |
2307 | * They're called even less than the "set direction" calls. | |
2308 | */ | |
fac9d885 | 2309 | static int gpiod_request_commit(struct gpio_desc *desc, const char *label) |
d2876d08 | 2310 | { |
fdeb8e15 | 2311 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 2312 | int status; |
d2876d08 | 2313 | unsigned long flags; |
3789f5ac | 2314 | unsigned offset; |
d2876d08 | 2315 | |
18534df4 MS |
2316 | if (label) { |
2317 | label = kstrdup_const(label, GFP_KERNEL); | |
2318 | if (!label) | |
2319 | return -ENOMEM; | |
2320 | } | |
2321 | ||
bcabdef1 AC |
2322 | spin_lock_irqsave(&gpio_lock, flags); |
2323 | ||
d2876d08 | 2324 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 2325 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
2326 | */ |
2327 | ||
2328 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
2329 | desc_set_label(desc, label ? : "?"); | |
2330 | status = 0; | |
438d8908 | 2331 | } else { |
18534df4 | 2332 | kfree_const(label); |
d2876d08 | 2333 | status = -EBUSY; |
7460db56 | 2334 | goto done; |
35e8bb51 DB |
2335 | } |
2336 | ||
2337 | if (chip->request) { | |
2338 | /* chip->request may sleep */ | |
2339 | spin_unlock_irqrestore(&gpio_lock, flags); | |
3789f5ac BD |
2340 | offset = gpio_chip_hwgpio(desc); |
2341 | if (gpiochip_line_is_valid(chip, offset)) | |
2342 | status = chip->request(chip, offset); | |
2343 | else | |
2344 | status = -EINVAL; | |
35e8bb51 DB |
2345 | spin_lock_irqsave(&gpio_lock, flags); |
2346 | ||
2347 | if (status < 0) { | |
2348 | desc_set_label(desc, NULL); | |
18534df4 | 2349 | kfree_const(label); |
35e8bb51 | 2350 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 2351 | goto done; |
35e8bb51 | 2352 | } |
438d8908 | 2353 | } |
80b0a602 MN |
2354 | if (chip->get_direction) { |
2355 | /* chip->get_direction may sleep */ | |
2356 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2357 | gpiod_get_direction(desc); |
80b0a602 MN |
2358 | spin_lock_irqsave(&gpio_lock, flags); |
2359 | } | |
77c2d792 MW |
2360 | done: |
2361 | spin_unlock_irqrestore(&gpio_lock, flags); | |
2362 | return status; | |
2363 | } | |
2364 | ||
fdeb8e15 LW |
2365 | /* |
2366 | * This descriptor validation needs to be inserted verbatim into each | |
2367 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
2368 | * macro to avoid endless duplication. If the desc is NULL it is an |
2369 | * optional GPIO and calls should just bail out. | |
fdeb8e15 | 2370 | */ |
a746a232 RV |
2371 | static int validate_desc(const struct gpio_desc *desc, const char *func) |
2372 | { | |
2373 | if (!desc) | |
2374 | return 0; | |
2375 | if (IS_ERR(desc)) { | |
2376 | pr_warn("%s: invalid GPIO (errorpointer)\n", func); | |
2377 | return PTR_ERR(desc); | |
2378 | } | |
2379 | if (!desc->gdev) { | |
2380 | pr_warn("%s: invalid GPIO (no device)\n", func); | |
2381 | return -EINVAL; | |
2382 | } | |
2383 | if (!desc->gdev->chip) { | |
2384 | dev_warn(&desc->gdev->dev, | |
2385 | "%s: backing chip is gone\n", func); | |
2386 | return 0; | |
2387 | } | |
2388 | return 1; | |
2389 | } | |
2390 | ||
fdeb8e15 | 2391 | #define VALIDATE_DESC(desc) do { \ |
a746a232 RV |
2392 | int __valid = validate_desc(desc, __func__); \ |
2393 | if (__valid <= 0) \ | |
2394 | return __valid; \ | |
2395 | } while (0) | |
fdeb8e15 LW |
2396 | |
2397 | #define VALIDATE_DESC_VOID(desc) do { \ | |
a746a232 RV |
2398 | int __valid = validate_desc(desc, __func__); \ |
2399 | if (__valid <= 0) \ | |
fdeb8e15 | 2400 | return; \ |
a746a232 | 2401 | } while (0) |
fdeb8e15 | 2402 | |
0eb4c6c2 | 2403 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
2404 | { |
2405 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 2406 | struct gpio_device *gdev; |
77c2d792 | 2407 | |
fdeb8e15 LW |
2408 | VALIDATE_DESC(desc); |
2409 | gdev = desc->gdev; | |
77c2d792 | 2410 | |
fdeb8e15 | 2411 | if (try_module_get(gdev->owner)) { |
fac9d885 | 2412 | status = gpiod_request_commit(desc, label); |
77c2d792 | 2413 | if (status < 0) |
fdeb8e15 | 2414 | module_put(gdev->owner); |
33a68e86 LW |
2415 | else |
2416 | get_device(&gdev->dev); | |
77c2d792 MW |
2417 | } |
2418 | ||
d2876d08 | 2419 | if (status) |
7589e59f | 2420 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 2421 | |
d2876d08 DB |
2422 | return status; |
2423 | } | |
372e722e | 2424 | |
fac9d885 | 2425 | static bool gpiod_free_commit(struct gpio_desc *desc) |
d2876d08 | 2426 | { |
77c2d792 | 2427 | bool ret = false; |
d2876d08 | 2428 | unsigned long flags; |
35e8bb51 | 2429 | struct gpio_chip *chip; |
d2876d08 | 2430 | |
3d599d1c UKK |
2431 | might_sleep(); |
2432 | ||
372e722e | 2433 | gpiod_unexport(desc); |
d8f388d8 | 2434 | |
d2876d08 DB |
2435 | spin_lock_irqsave(&gpio_lock, flags); |
2436 | ||
fdeb8e15 | 2437 | chip = desc->gdev->chip; |
35e8bb51 DB |
2438 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2439 | if (chip->free) { | |
2440 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2441 | might_sleep_if(chip->can_sleep); |
372e722e | 2442 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2443 | spin_lock_irqsave(&gpio_lock, flags); |
2444 | } | |
18534df4 | 2445 | kfree_const(desc->label); |
d2876d08 | 2446 | desc_set_label(desc, NULL); |
07697461 | 2447 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2448 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2449 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2450 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2451 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2452 | ret = true; |
2453 | } | |
d2876d08 DB |
2454 | |
2455 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2456 | return ret; |
2457 | } | |
2458 | ||
0eb4c6c2 | 2459 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2460 | { |
fac9d885 | 2461 | if (desc && desc->gdev && gpiod_free_commit(desc)) { |
fdeb8e15 | 2462 | module_put(desc->gdev->owner); |
33a68e86 LW |
2463 | put_device(&desc->gdev->dev); |
2464 | } else { | |
77c2d792 | 2465 | WARN_ON(extra_checks); |
33a68e86 | 2466 | } |
d2876d08 | 2467 | } |
372e722e | 2468 | |
d2876d08 DB |
2469 | /** |
2470 | * gpiochip_is_requested - return string iff signal was requested | |
2471 | * @chip: controller managing the signal | |
2472 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2473 | * | |
2474 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2475 | * The string returned is the label passed to gpio_request(); if none has been |
2476 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2477 | * |
2478 | * This function is for use by GPIO controller drivers. The label can | |
2479 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2480 | * can help avoid accidentally multiplexing it to another controller. | |
2481 | */ | |
2482 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2483 | { | |
6c0b4e6c | 2484 | struct gpio_desc *desc; |
d2876d08 | 2485 | |
48b5953e | 2486 | if (offset >= chip->ngpio) |
d2876d08 | 2487 | return NULL; |
6c0b4e6c | 2488 | |
1c3cdb18 | 2489 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2490 | |
372e722e | 2491 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2492 | return NULL; |
372e722e | 2493 | return desc->label; |
d2876d08 DB |
2494 | } |
2495 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2496 | ||
77c2d792 MW |
2497 | /** |
2498 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
950d55f5 TR |
2499 | * @chip: GPIO chip |
2500 | * @hwnum: hardware number of the GPIO for which to request the descriptor | |
77c2d792 | 2501 | * @label: label for the GPIO |
21abf103 | 2502 | * @flags: flags for this GPIO or 0 if default |
77c2d792 MW |
2503 | * |
2504 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2505 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2506 | * function will not increase reference count of the GPIO chip module. This | |
2507 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2508 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
950d55f5 TR |
2509 | * |
2510 | * Returns: | |
2511 | * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error | |
2512 | * code on failure. | |
77c2d792 | 2513 | */ |
abdc08a3 | 2514 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
21abf103 LW |
2515 | const char *label, |
2516 | enum gpiod_flags flags) | |
77c2d792 | 2517 | { |
abdc08a3 AC |
2518 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2519 | int err; | |
77c2d792 | 2520 | |
abdc08a3 AC |
2521 | if (IS_ERR(desc)) { |
2522 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2523 | return desc; | |
2524 | } | |
2525 | ||
fac9d885 | 2526 | err = gpiod_request_commit(desc, label); |
abdc08a3 AC |
2527 | if (err < 0) |
2528 | return ERR_PTR(err); | |
77c2d792 | 2529 | |
21abf103 LW |
2530 | err = gpiod_configure_flags(desc, label, 0, flags); |
2531 | if (err) { | |
2532 | chip_err(chip, "setup of own GPIO %s failed\n", label); | |
2533 | gpiod_free_commit(desc); | |
2534 | return ERR_PTR(err); | |
2535 | } | |
2536 | ||
abdc08a3 | 2537 | return desc; |
77c2d792 | 2538 | } |
f7d4ad98 | 2539 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2540 | |
2541 | /** | |
2542 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2543 | * @desc: GPIO descriptor to free | |
2544 | * | |
2545 | * Function frees the given GPIO requested previously with | |
2546 | * gpiochip_request_own_desc(). | |
2547 | */ | |
2548 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2549 | { | |
2550 | if (desc) | |
fac9d885 | 2551 | gpiod_free_commit(desc); |
77c2d792 | 2552 | } |
f7d4ad98 | 2553 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2554 | |
fdeb8e15 LW |
2555 | /* |
2556 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2557 | * some cases this is done in early boot, before IRQs are enabled. |
2558 | * | |
2559 | * As a rule these aren't called more than once (except for drivers | |
2560 | * using the open-drain emulation idiom) so these are natural places | |
2561 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2562 | * rely on gpio_request() having been called beforehand. | |
2563 | */ | |
2564 | ||
71479789 TP |
2565 | static int gpio_set_config(struct gpio_chip *gc, unsigned offset, |
2566 | enum pin_config_param mode) | |
2567 | { | |
2568 | unsigned long config = { PIN_CONF_PACKED(mode, 0) }; | |
2569 | ||
2570 | return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP; | |
2571 | } | |
2572 | ||
79a9becd AC |
2573 | /** |
2574 | * gpiod_direction_input - set the GPIO direction to input | |
2575 | * @desc: GPIO to set to input | |
2576 | * | |
2577 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2578 | * be called safely on it. | |
2579 | * | |
2580 | * Return 0 in case of success, else an error code. | |
2581 | */ | |
2582 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2583 | { |
d2876d08 | 2584 | struct gpio_chip *chip; |
ae9847f4 | 2585 | int status = 0; |
d2876d08 | 2586 | |
fdeb8e15 LW |
2587 | VALIDATE_DESC(desc); |
2588 | chip = desc->gdev->chip; | |
bcabdef1 | 2589 | |
e48d194d LW |
2590 | /* |
2591 | * It is legal to have no .get() and .direction_input() specified if | |
2592 | * the chip is output-only, but you can't specify .direction_input() | |
2593 | * and not support the .get() operation, that doesn't make sense. | |
2594 | */ | |
ae9847f4 | 2595 | if (!chip->get && chip->direction_input) { |
6424de5a | 2596 | gpiod_warn(desc, |
e48d194d LW |
2597 | "%s: missing get() but have direction_input()\n", |
2598 | __func__); | |
be1a4b13 LW |
2599 | return -EIO; |
2600 | } | |
2601 | ||
e48d194d LW |
2602 | /* |
2603 | * If we have a .direction_input() callback, things are simple, | |
2604 | * just call it. Else we are some input-only chip so try to check the | |
2605 | * direction (if .get_direction() is supported) else we silently | |
2606 | * assume we are in input mode after this. | |
2607 | */ | |
ae9847f4 RRD |
2608 | if (chip->direction_input) { |
2609 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); | |
2610 | } else if (chip->get_direction && | |
2611 | (chip->get_direction(chip, gpio_chip_hwgpio(desc)) != 1)) { | |
2612 | gpiod_warn(desc, | |
e48d194d LW |
2613 | "%s: missing direction_input() operation and line is output\n", |
2614 | __func__); | |
ae9847f4 RRD |
2615 | return -EIO; |
2616 | } | |
d2876d08 DB |
2617 | if (status == 0) |
2618 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2619 | |
d449991c TP |
2620 | if (test_bit(FLAG_PULL_UP, &desc->flags)) |
2621 | gpio_set_config(chip, gpio_chip_hwgpio(desc), | |
2622 | PIN_CONFIG_BIAS_PULL_UP); | |
2623 | else if (test_bit(FLAG_PULL_DOWN, &desc->flags)) | |
2624 | gpio_set_config(chip, gpio_chip_hwgpio(desc), | |
2625 | PIN_CONFIG_BIAS_PULL_DOWN); | |
2626 | ||
372e722e | 2627 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2628 | |
d2876d08 DB |
2629 | return status; |
2630 | } | |
79a9becd | 2631 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2632 | |
fac9d885 | 2633 | static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) |
d2876d08 | 2634 | { |
c663e5f5 | 2635 | struct gpio_chip *gc = desc->gdev->chip; |
ad17731d | 2636 | int val = !!value; |
ae9847f4 | 2637 | int ret = 0; |
d2876d08 | 2638 | |
e48d194d LW |
2639 | /* |
2640 | * It's OK not to specify .direction_output() if the gpiochip is | |
2641 | * output-only, but if there is then not even a .set() operation it | |
2642 | * is pretty tricky to drive the output line. | |
2643 | */ | |
ae9847f4 | 2644 | if (!gc->set && !gc->direction_output) { |
6424de5a | 2645 | gpiod_warn(desc, |
e48d194d LW |
2646 | "%s: missing set() and direction_output() operations\n", |
2647 | __func__); | |
be1a4b13 LW |
2648 | return -EIO; |
2649 | } | |
2650 | ||
ae9847f4 RRD |
2651 | if (gc->direction_output) { |
2652 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); | |
2653 | } else { | |
e48d194d | 2654 | /* Check that we are in output mode if we can */ |
ae9847f4 RRD |
2655 | if (gc->get_direction && |
2656 | gc->get_direction(gc, gpio_chip_hwgpio(desc))) { | |
2657 | gpiod_warn(desc, | |
2658 | "%s: missing direction_output() operation\n", | |
2659 | __func__); | |
2660 | return -EIO; | |
2661 | } | |
e48d194d LW |
2662 | /* |
2663 | * If we can't actively set the direction, we are some | |
2664 | * output-only chip, so just drive the output as desired. | |
2665 | */ | |
ae9847f4 RRD |
2666 | gc->set(gc, gpio_chip_hwgpio(desc), val); |
2667 | } | |
2668 | ||
c663e5f5 | 2669 | if (!ret) |
d2876d08 | 2670 | set_bit(FLAG_IS_OUT, &desc->flags); |
ad17731d | 2671 | trace_gpio_value(desc_to_gpio(desc), 0, val); |
c663e5f5 LW |
2672 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2673 | return ret; | |
d2876d08 | 2674 | } |
ef70bbe1 PZ |
2675 | |
2676 | /** | |
2677 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2678 | * @desc: GPIO to set to output | |
2679 | * @value: initial output value of the GPIO | |
2680 | * | |
2681 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2682 | * be called safely on it. The initial value of the output must be specified | |
2683 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2684 | * | |
2685 | * Return 0 in case of success, else an error code. | |
2686 | */ | |
2687 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2688 | { | |
fdeb8e15 | 2689 | VALIDATE_DESC(desc); |
fac9d885 | 2690 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 PZ |
2691 | } |
2692 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2693 | ||
2694 | /** | |
90df4fe0 | 2695 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2696 | * @desc: GPIO to set to output |
2697 | * @value: initial output value of the GPIO | |
2698 | * | |
2699 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2700 | * be called safely on it. The initial value of the output must be specified | |
2701 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2702 | * account. | |
2703 | * | |
2704 | * Return 0 in case of success, else an error code. | |
2705 | */ | |
2706 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2707 | { | |
30322bcf | 2708 | struct gpio_chip *gc; |
02e47980 LW |
2709 | int ret; |
2710 | ||
fdeb8e15 | 2711 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2712 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2713 | value = !value; | |
ad17731d LW |
2714 | else |
2715 | value = !!value; | |
02e47980 | 2716 | |
4e9439dd HV |
2717 | /* GPIOs used for enabled IRQs shall not be set as output */ |
2718 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) && | |
2719 | test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) { | |
02e47980 LW |
2720 | gpiod_err(desc, |
2721 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2722 | __func__); | |
2723 | return -EIO; | |
2724 | } | |
2725 | ||
30322bcf | 2726 | gc = desc->gdev->chip; |
02e47980 LW |
2727 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
2728 | /* First see if we can enable open drain in hardware */ | |
71479789 TP |
2729 | ret = gpio_set_config(gc, gpio_chip_hwgpio(desc), |
2730 | PIN_CONFIG_DRIVE_OPEN_DRAIN); | |
02e47980 LW |
2731 | if (!ret) |
2732 | goto set_output_value; | |
2733 | /* Emulate open drain by not actively driving the line high */ | |
2734 | if (value) | |
2735 | return gpiod_direction_input(desc); | |
2736 | } | |
2737 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
71479789 TP |
2738 | ret = gpio_set_config(gc, gpio_chip_hwgpio(desc), |
2739 | PIN_CONFIG_DRIVE_OPEN_SOURCE); | |
02e47980 LW |
2740 | if (!ret) |
2741 | goto set_output_value; | |
2742 | /* Emulate open source by not actively driving the line low */ | |
2743 | if (!value) | |
2744 | return gpiod_direction_input(desc); | |
2745 | } else { | |
71479789 TP |
2746 | gpio_set_config(gc, gpio_chip_hwgpio(desc), |
2747 | PIN_CONFIG_DRIVE_PUSH_PULL); | |
02e47980 LW |
2748 | } |
2749 | ||
2750 | set_output_value: | |
fac9d885 | 2751 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 | 2752 | } |
79a9becd | 2753 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2754 | |
c4b5be98 | 2755 | /** |
950d55f5 TR |
2756 | * gpiod_set_debounce - sets @debounce time for a GPIO |
2757 | * @desc: descriptor of the GPIO for which to set debounce time | |
2758 | * @debounce: debounce time in microseconds | |
65d87656 | 2759 | * |
950d55f5 TR |
2760 | * Returns: |
2761 | * 0 on success, %-ENOTSUPP if the controller doesn't support setting the | |
2762 | * debounce time. | |
c4b5be98 | 2763 | */ |
79a9becd | 2764 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2765 | { |
c4b5be98 | 2766 | struct gpio_chip *chip; |
2956b5d9 | 2767 | unsigned long config; |
c4b5be98 | 2768 | |
fdeb8e15 LW |
2769 | VALIDATE_DESC(desc); |
2770 | chip = desc->gdev->chip; | |
2956b5d9 | 2771 | if (!chip->set || !chip->set_config) { |
6424de5a | 2772 | gpiod_dbg(desc, |
2956b5d9 | 2773 | "%s: missing set() or set_config() operations\n", |
6424de5a | 2774 | __func__); |
65d87656 | 2775 | return -ENOTSUPP; |
be1a4b13 LW |
2776 | } |
2777 | ||
2956b5d9 | 2778 | config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
6581eaf0 | 2779 | return gpio_set_config(chip, gpio_chip_hwgpio(desc), config); |
c4b5be98 | 2780 | } |
79a9becd | 2781 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2782 | |
e10f72bf AJ |
2783 | /** |
2784 | * gpiod_set_transitory - Lose or retain GPIO state on suspend or reset | |
2785 | * @desc: descriptor of the GPIO for which to configure persistence | |
2786 | * @transitory: True to lose state on suspend or reset, false for persistence | |
2787 | * | |
2788 | * Returns: | |
2789 | * 0 on success, otherwise a negative error code. | |
2790 | */ | |
2791 | int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) | |
2792 | { | |
2793 | struct gpio_chip *chip; | |
2794 | unsigned long packed; | |
2795 | int gpio; | |
2796 | int rc; | |
2797 | ||
156dd392 | 2798 | VALIDATE_DESC(desc); |
e10f72bf AJ |
2799 | /* |
2800 | * Handle FLAG_TRANSITORY first, enabling queries to gpiolib for | |
2801 | * persistence state. | |
2802 | */ | |
2803 | if (transitory) | |
2804 | set_bit(FLAG_TRANSITORY, &desc->flags); | |
2805 | else | |
2806 | clear_bit(FLAG_TRANSITORY, &desc->flags); | |
2807 | ||
2808 | /* If the driver supports it, set the persistence state now */ | |
2809 | chip = desc->gdev->chip; | |
2810 | if (!chip->set_config) | |
2811 | return 0; | |
2812 | ||
2813 | packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE, | |
2814 | !transitory); | |
2815 | gpio = gpio_chip_hwgpio(desc); | |
6581eaf0 | 2816 | rc = gpio_set_config(chip, gpio, packed); |
e10f72bf AJ |
2817 | if (rc == -ENOTSUPP) { |
2818 | dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n", | |
2819 | gpio); | |
2820 | return 0; | |
2821 | } | |
2822 | ||
2823 | return rc; | |
2824 | } | |
2825 | EXPORT_SYMBOL_GPL(gpiod_set_transitory); | |
2826 | ||
79a9becd AC |
2827 | /** |
2828 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2829 | * @desc: the gpio descriptor to test | |
2830 | * | |
2831 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2832 | */ | |
2833 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2834 | { |
fdeb8e15 | 2835 | VALIDATE_DESC(desc); |
79a9becd | 2836 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2837 | } |
79a9becd | 2838 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2839 | |
2840 | /* I/O calls are only valid after configuration completed; the relevant | |
2841 | * "is this a valid GPIO" error checks should already have been done. | |
2842 | * | |
2843 | * "Get" operations are often inlinable as reading a pin value register, | |
2844 | * and masking the relevant bit in that register. | |
2845 | * | |
2846 | * When "set" operations are inlinable, they involve writing that mask to | |
2847 | * one register to set a low value, or a different register to set it high. | |
2848 | * Otherwise locking is needed, so there may be little value to inlining. | |
2849 | * | |
2850 | *------------------------------------------------------------------------ | |
2851 | * | |
2852 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2853 | * have requested the GPIO. That can include implicit requesting by | |
2854 | * a direction setting call. Marking a gpio as requested locks its chip | |
2855 | * in memory, guaranteeing that these table lookups need no more locking | |
2856 | * and that gpiochip_remove() will fail. | |
2857 | * | |
2858 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2859 | * that the GPIO was actually requested. | |
2860 | */ | |
2861 | ||
fac9d885 | 2862 | static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) |
d2876d08 DB |
2863 | { |
2864 | struct gpio_chip *chip; | |
372e722e | 2865 | int offset; |
e20538b8 | 2866 | int value; |
d2876d08 | 2867 | |
fdeb8e15 | 2868 | chip = desc->gdev->chip; |
372e722e | 2869 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2870 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2871 | value = value < 0 ? value : !!value; |
372e722e | 2872 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2873 | return value; |
d2876d08 | 2874 | } |
372e722e | 2875 | |
eec1d566 LW |
2876 | static int gpio_chip_get_multiple(struct gpio_chip *chip, |
2877 | unsigned long *mask, unsigned long *bits) | |
2878 | { | |
2879 | if (chip->get_multiple) { | |
2880 | return chip->get_multiple(chip, mask, bits); | |
2881 | } else if (chip->get) { | |
2882 | int i, value; | |
2883 | ||
2884 | for_each_set_bit(i, mask, chip->ngpio) { | |
2885 | value = chip->get(chip, i); | |
2886 | if (value < 0) | |
2887 | return value; | |
2888 | __assign_bit(i, bits, value); | |
2889 | } | |
2890 | return 0; | |
2891 | } | |
2892 | return -EIO; | |
2893 | } | |
2894 | ||
2895 | int gpiod_get_array_value_complex(bool raw, bool can_sleep, | |
2896 | unsigned int array_size, | |
2897 | struct gpio_desc **desc_array, | |
77588c14 | 2898 | struct gpio_array *array_info, |
b9762beb | 2899 | unsigned long *value_bitmap) |
eec1d566 | 2900 | { |
b17566a6 JK |
2901 | int err, i = 0; |
2902 | ||
2903 | /* | |
2904 | * Validate array_info against desc_array and its size. | |
2905 | * It should immediately follow desc_array if both | |
2906 | * have been obtained from the same gpiod_get_array() call. | |
2907 | */ | |
2908 | if (array_info && array_info->desc == desc_array && | |
2909 | array_size <= array_info->size && | |
2910 | (void *)array_info == desc_array + array_info->size) { | |
2911 | if (!can_sleep) | |
2912 | WARN_ON(array_info->chip->can_sleep); | |
2913 | ||
2914 | err = gpio_chip_get_multiple(array_info->chip, | |
2915 | array_info->get_mask, | |
2916 | value_bitmap); | |
2917 | if (err) | |
2918 | return err; | |
2919 | ||
2920 | if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) | |
2921 | bitmap_xor(value_bitmap, value_bitmap, | |
2922 | array_info->invert_mask, array_size); | |
2923 | ||
2924 | if (bitmap_full(array_info->get_mask, array_size)) | |
2925 | return 0; | |
2926 | ||
2927 | i = find_first_zero_bit(array_info->get_mask, array_size); | |
2928 | } else { | |
2929 | array_info = NULL; | |
2930 | } | |
eec1d566 LW |
2931 | |
2932 | while (i < array_size) { | |
2933 | struct gpio_chip *chip = desc_array[i]->gdev->chip; | |
3027743f LA |
2934 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
2935 | unsigned long *mask, *bits; | |
eec1d566 LW |
2936 | int first, j, ret; |
2937 | ||
3027743f LA |
2938 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
2939 | mask = fastpath; | |
2940 | } else { | |
2941 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
2942 | sizeof(*mask), | |
2943 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
2944 | if (!mask) | |
2945 | return -ENOMEM; | |
2946 | } | |
2947 | ||
2948 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
2949 | bitmap_zero(mask, chip->ngpio); | |
2950 | ||
eec1d566 LW |
2951 | if (!can_sleep) |
2952 | WARN_ON(chip->can_sleep); | |
2953 | ||
2954 | /* collect all inputs belonging to the same chip */ | |
2955 | first = i; | |
eec1d566 LW |
2956 | do { |
2957 | const struct gpio_desc *desc = desc_array[i]; | |
2958 | int hwgpio = gpio_chip_hwgpio(desc); | |
2959 | ||
2960 | __set_bit(hwgpio, mask); | |
2961 | i++; | |
b17566a6 JK |
2962 | |
2963 | if (array_info) | |
35ae7f96 JK |
2964 | i = find_next_zero_bit(array_info->get_mask, |
2965 | array_size, i); | |
eec1d566 LW |
2966 | } while ((i < array_size) && |
2967 | (desc_array[i]->gdev->chip == chip)); | |
2968 | ||
2969 | ret = gpio_chip_get_multiple(chip, mask, bits); | |
3027743f LA |
2970 | if (ret) { |
2971 | if (mask != fastpath) | |
2972 | kfree(mask); | |
eec1d566 | 2973 | return ret; |
3027743f | 2974 | } |
eec1d566 | 2975 | |
b17566a6 | 2976 | for (j = first; j < i; ) { |
eec1d566 LW |
2977 | const struct gpio_desc *desc = desc_array[j]; |
2978 | int hwgpio = gpio_chip_hwgpio(desc); | |
2979 | int value = test_bit(hwgpio, bits); | |
2980 | ||
2981 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2982 | value = !value; | |
b9762beb | 2983 | __assign_bit(j, value_bitmap, value); |
eec1d566 | 2984 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
799d5eb4 | 2985 | j++; |
b17566a6 JK |
2986 | |
2987 | if (array_info) | |
35ae7f96 JK |
2988 | j = find_next_zero_bit(array_info->get_mask, i, |
2989 | j); | |
eec1d566 | 2990 | } |
3027743f LA |
2991 | |
2992 | if (mask != fastpath) | |
2993 | kfree(mask); | |
eec1d566 LW |
2994 | } |
2995 | return 0; | |
2996 | } | |
2997 | ||
d2876d08 | 2998 | /** |
79a9becd AC |
2999 | * gpiod_get_raw_value() - return a gpio's raw value |
3000 | * @desc: gpio whose value will be returned | |
d2876d08 | 3001 | * |
79a9becd | 3002 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 3003 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
3004 | * |
3005 | * This function should be called from contexts where we cannot sleep, and will | |
3006 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 3007 | */ |
79a9becd | 3008 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 3009 | { |
fdeb8e15 | 3010 | VALIDATE_DESC(desc); |
e4e449e8 | 3011 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 3012 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 3013 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 3014 | } |
79a9becd | 3015 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 3016 | |
79a9becd AC |
3017 | /** |
3018 | * gpiod_get_value() - return a gpio's value | |
3019 | * @desc: gpio whose value will be returned | |
3020 | * | |
3021 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 3022 | * account, or negative errno on failure. |
79a9becd AC |
3023 | * |
3024 | * This function should be called from contexts where we cannot sleep, and will | |
3025 | * complain if the GPIO chip functions potentially sleep. | |
3026 | */ | |
3027 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 3028 | { |
79a9becd | 3029 | int value; |
fdeb8e15 LW |
3030 | |
3031 | VALIDATE_DESC(desc); | |
79a9becd | 3032 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 3033 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 3034 | |
fac9d885 | 3035 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
3036 | if (value < 0) |
3037 | return value; | |
3038 | ||
79a9becd AC |
3039 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3040 | value = !value; | |
3041 | ||
3042 | return value; | |
372e722e | 3043 | } |
79a9becd | 3044 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 3045 | |
eec1d566 LW |
3046 | /** |
3047 | * gpiod_get_raw_array_value() - read raw values from an array of GPIOs | |
b9762beb | 3048 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3049 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3050 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3051 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3052 | * |
3053 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
3054 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
3055 | * else an error code. | |
3056 | * | |
3057 | * This function should be called from contexts where we cannot sleep, | |
3058 | * and it will complain if the GPIO chip functions potentially sleep. | |
3059 | */ | |
3060 | int gpiod_get_raw_array_value(unsigned int array_size, | |
b9762beb | 3061 | struct gpio_desc **desc_array, |
77588c14 | 3062 | struct gpio_array *array_info, |
b9762beb | 3063 | unsigned long *value_bitmap) |
eec1d566 LW |
3064 | { |
3065 | if (!desc_array) | |
3066 | return -EINVAL; | |
3067 | return gpiod_get_array_value_complex(true, false, array_size, | |
77588c14 JK |
3068 | desc_array, array_info, |
3069 | value_bitmap); | |
eec1d566 LW |
3070 | } |
3071 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value); | |
3072 | ||
3073 | /** | |
3074 | * gpiod_get_array_value() - read values from an array of GPIOs | |
b9762beb | 3075 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3076 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3077 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3078 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3079 | * |
3080 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3081 | * into account. Return 0 in case of success, else an error code. | |
3082 | * | |
3083 | * This function should be called from contexts where we cannot sleep, | |
3084 | * and it will complain if the GPIO chip functions potentially sleep. | |
3085 | */ | |
3086 | int gpiod_get_array_value(unsigned int array_size, | |
b9762beb | 3087 | struct gpio_desc **desc_array, |
77588c14 | 3088 | struct gpio_array *array_info, |
b9762beb | 3089 | unsigned long *value_bitmap) |
eec1d566 LW |
3090 | { |
3091 | if (!desc_array) | |
3092 | return -EINVAL; | |
3093 | return gpiod_get_array_value_complex(false, false, array_size, | |
77588c14 JK |
3094 | desc_array, array_info, |
3095 | value_bitmap); | |
eec1d566 LW |
3096 | } |
3097 | EXPORT_SYMBOL_GPL(gpiod_get_array_value); | |
3098 | ||
aca5ce14 | 3099 | /* |
fac9d885 | 3100 | * gpio_set_open_drain_value_commit() - Set the open drain gpio's value. |
79a9becd | 3101 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 3102 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 3103 | */ |
fac9d885 | 3104 | static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
3105 | { |
3106 | int err = 0; | |
fdeb8e15 | 3107 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
3108 | int offset = gpio_chip_hwgpio(desc); |
3109 | ||
aca5ce14 | 3110 | if (value) { |
372e722e | 3111 | err = chip->direction_input(chip, offset); |
aca5ce14 | 3112 | if (!err) |
372e722e | 3113 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 3114 | } else { |
372e722e | 3115 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 3116 | if (!err) |
372e722e | 3117 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 3118 | } |
372e722e | 3119 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 3120 | if (err < 0) |
6424de5a MB |
3121 | gpiod_err(desc, |
3122 | "%s: Error in set_value for open drain err %d\n", | |
3123 | __func__, err); | |
aca5ce14 LD |
3124 | } |
3125 | ||
25553ff0 | 3126 | /* |
79a9becd AC |
3127 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
3128 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 3129 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 3130 | */ |
fac9d885 | 3131 | static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) |
25553ff0 LD |
3132 | { |
3133 | int err = 0; | |
fdeb8e15 | 3134 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
3135 | int offset = gpio_chip_hwgpio(desc); |
3136 | ||
25553ff0 | 3137 | if (value) { |
372e722e | 3138 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 3139 | if (!err) |
372e722e | 3140 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 3141 | } else { |
372e722e | 3142 | err = chip->direction_input(chip, offset); |
25553ff0 | 3143 | if (!err) |
372e722e | 3144 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 3145 | } |
372e722e | 3146 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 3147 | if (err < 0) |
6424de5a MB |
3148 | gpiod_err(desc, |
3149 | "%s: Error in set_value for open source err %d\n", | |
3150 | __func__, err); | |
25553ff0 LD |
3151 | } |
3152 | ||
fac9d885 | 3153 | static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) |
d2876d08 DB |
3154 | { |
3155 | struct gpio_chip *chip; | |
3156 | ||
fdeb8e15 | 3157 | chip = desc->gdev->chip; |
372e722e | 3158 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
02e47980 | 3159 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
372e722e AC |
3160 | } |
3161 | ||
5f424243 RI |
3162 | /* |
3163 | * set multiple outputs on the same chip; | |
3164 | * use the chip's set_multiple function if available; | |
3165 | * otherwise set the outputs sequentially; | |
3166 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
3167 | * defines which outputs are to be changed | |
3168 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
3169 | * defines the values the outputs specified by mask are to be set to | |
3170 | */ | |
3171 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
3172 | unsigned long *mask, unsigned long *bits) | |
3173 | { | |
3174 | if (chip->set_multiple) { | |
3175 | chip->set_multiple(chip, mask, bits); | |
3176 | } else { | |
5e4e6fb3 AS |
3177 | unsigned int i; |
3178 | ||
3179 | /* set outputs if the corresponding mask bit is set */ | |
3180 | for_each_set_bit(i, mask, chip->ngpio) | |
3181 | chip->set(chip, i, test_bit(i, bits)); | |
5f424243 RI |
3182 | } |
3183 | } | |
3184 | ||
3027743f | 3185 | int gpiod_set_array_value_complex(bool raw, bool can_sleep, |
3c940660 GU |
3186 | unsigned int array_size, |
3187 | struct gpio_desc **desc_array, | |
3188 | struct gpio_array *array_info, | |
3189 | unsigned long *value_bitmap) | |
5f424243 RI |
3190 | { |
3191 | int i = 0; | |
3192 | ||
b17566a6 JK |
3193 | /* |
3194 | * Validate array_info against desc_array and its size. | |
3195 | * It should immediately follow desc_array if both | |
3196 | * have been obtained from the same gpiod_get_array() call. | |
3197 | */ | |
3198 | if (array_info && array_info->desc == desc_array && | |
3199 | array_size <= array_info->size && | |
3200 | (void *)array_info == desc_array + array_info->size) { | |
3201 | if (!can_sleep) | |
3202 | WARN_ON(array_info->chip->can_sleep); | |
3203 | ||
3204 | if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) | |
3205 | bitmap_xor(value_bitmap, value_bitmap, | |
3206 | array_info->invert_mask, array_size); | |
3207 | ||
3208 | gpio_chip_set_multiple(array_info->chip, array_info->set_mask, | |
3209 | value_bitmap); | |
3210 | ||
3211 | if (bitmap_full(array_info->set_mask, array_size)) | |
3212 | return 0; | |
3213 | ||
3214 | i = find_first_zero_bit(array_info->set_mask, array_size); | |
3215 | } else { | |
3216 | array_info = NULL; | |
3217 | } | |
3218 | ||
5f424243 | 3219 | while (i < array_size) { |
fdeb8e15 | 3220 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
3027743f LA |
3221 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
3222 | unsigned long *mask, *bits; | |
5f424243 RI |
3223 | int count = 0; |
3224 | ||
3027743f LA |
3225 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
3226 | mask = fastpath; | |
3227 | } else { | |
3228 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
3229 | sizeof(*mask), | |
3230 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
3231 | if (!mask) | |
3232 | return -ENOMEM; | |
3233 | } | |
3234 | ||
3235 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
3236 | bitmap_zero(mask, chip->ngpio); | |
3237 | ||
38e003f4 | 3238 | if (!can_sleep) |
5f424243 | 3239 | WARN_ON(chip->can_sleep); |
38e003f4 | 3240 | |
5f424243 RI |
3241 | do { |
3242 | struct gpio_desc *desc = desc_array[i]; | |
3243 | int hwgpio = gpio_chip_hwgpio(desc); | |
b9762beb | 3244 | int value = test_bit(i, value_bitmap); |
5f424243 | 3245 | |
b17566a6 JK |
3246 | /* |
3247 | * Pins applicable for fast input but not for | |
3248 | * fast output processing may have been already | |
3249 | * inverted inside the fast path, skip them. | |
3250 | */ | |
3251 | if (!raw && !(array_info && | |
3252 | test_bit(i, array_info->invert_mask)) && | |
3253 | test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
5f424243 RI |
3254 | value = !value; |
3255 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
3256 | /* | |
3257 | * collect all normal outputs belonging to the same chip | |
3258 | * open drain and open source outputs are set individually | |
3259 | */ | |
02e47980 | 3260 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) { |
fac9d885 | 3261 | gpio_set_open_drain_value_commit(desc, value); |
02e47980 | 3262 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) { |
fac9d885 | 3263 | gpio_set_open_source_value_commit(desc, value); |
5f424243 RI |
3264 | } else { |
3265 | __set_bit(hwgpio, mask); | |
38e003f4 | 3266 | if (value) |
5f424243 | 3267 | __set_bit(hwgpio, bits); |
38e003f4 | 3268 | else |
5f424243 | 3269 | __clear_bit(hwgpio, bits); |
5f424243 RI |
3270 | count++; |
3271 | } | |
3272 | i++; | |
b17566a6 JK |
3273 | |
3274 | if (array_info) | |
35ae7f96 JK |
3275 | i = find_next_zero_bit(array_info->set_mask, |
3276 | array_size, i); | |
fdeb8e15 LW |
3277 | } while ((i < array_size) && |
3278 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 3279 | /* push collected bits to outputs */ |
38e003f4 | 3280 | if (count != 0) |
5f424243 | 3281 | gpio_chip_set_multiple(chip, mask, bits); |
3027743f LA |
3282 | |
3283 | if (mask != fastpath) | |
3284 | kfree(mask); | |
5f424243 | 3285 | } |
3027743f | 3286 | return 0; |
5f424243 RI |
3287 | } |
3288 | ||
d2876d08 | 3289 | /** |
79a9becd AC |
3290 | * gpiod_set_raw_value() - assign a gpio's raw value |
3291 | * @desc: gpio whose value will be assigned | |
d2876d08 | 3292 | * @value: value to assign |
d2876d08 | 3293 | * |
79a9becd AC |
3294 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
3295 | * regard for its ACTIVE_LOW status. | |
3296 | * | |
3297 | * This function should be called from contexts where we cannot sleep, and will | |
3298 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 3299 | */ |
79a9becd | 3300 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 3301 | { |
fdeb8e15 | 3302 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 3303 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 3304 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 3305 | gpiod_set_raw_value_commit(desc, value); |
d2876d08 | 3306 | } |
79a9becd | 3307 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 | 3308 | |
1e77fc82 GU |
3309 | /** |
3310 | * gpiod_set_value_nocheck() - set a GPIO line value without checking | |
3311 | * @desc: the descriptor to set the value on | |
3312 | * @value: value to set | |
3313 | * | |
3314 | * This sets the value of a GPIO line backing a descriptor, applying | |
3315 | * different semantic quirks like active low and open drain/source | |
3316 | * handling. | |
3317 | */ | |
3318 | static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value) | |
3319 | { | |
3320 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
3321 | value = !value; | |
3322 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
3323 | gpio_set_open_drain_value_commit(desc, value); | |
3324 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
3325 | gpio_set_open_source_value_commit(desc, value); | |
3326 | else | |
3327 | gpiod_set_raw_value_commit(desc, value); | |
3328 | } | |
3329 | ||
d2876d08 | 3330 | /** |
79a9becd AC |
3331 | * gpiod_set_value() - assign a gpio's value |
3332 | * @desc: gpio whose value will be assigned | |
3333 | * @value: value to assign | |
3334 | * | |
02e47980 LW |
3335 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW, |
3336 | * OPEN_DRAIN and OPEN_SOURCE flags into account. | |
d2876d08 | 3337 | * |
79a9becd AC |
3338 | * This function should be called from contexts where we cannot sleep, and will |
3339 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 3340 | */ |
79a9becd | 3341 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 3342 | { |
fdeb8e15 | 3343 | VALIDATE_DESC_VOID(desc); |
fdeb8e15 | 3344 | WARN_ON(desc->gdev->chip->can_sleep); |
1e77fc82 | 3345 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3346 | } |
79a9becd | 3347 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 3348 | |
5f424243 | 3349 | /** |
3fff99bc | 3350 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
b9762beb | 3351 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3352 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3353 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3354 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3355 | * |
3356 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3357 | * without regard for their ACTIVE_LOW status. | |
3358 | * | |
3359 | * This function should be called from contexts where we cannot sleep, and will | |
3360 | * complain if the GPIO chip functions potentially sleep. | |
3361 | */ | |
3027743f | 3362 | int gpiod_set_raw_array_value(unsigned int array_size, |
3c940660 GU |
3363 | struct gpio_desc **desc_array, |
3364 | struct gpio_array *array_info, | |
3365 | unsigned long *value_bitmap) | |
5f424243 RI |
3366 | { |
3367 | if (!desc_array) | |
3027743f LA |
3368 | return -EINVAL; |
3369 | return gpiod_set_array_value_complex(true, false, array_size, | |
77588c14 | 3370 | desc_array, array_info, value_bitmap); |
5f424243 | 3371 | } |
3fff99bc | 3372 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
3373 | |
3374 | /** | |
3fff99bc | 3375 | * gpiod_set_array_value() - assign values to an array of GPIOs |
b9762beb | 3376 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3377 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3378 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3379 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3380 | * |
3381 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3382 | * into account. | |
3383 | * | |
3384 | * This function should be called from contexts where we cannot sleep, and will | |
3385 | * complain if the GPIO chip functions potentially sleep. | |
3386 | */ | |
cf9af0d5 GU |
3387 | int gpiod_set_array_value(unsigned int array_size, |
3388 | struct gpio_desc **desc_array, | |
3389 | struct gpio_array *array_info, | |
3390 | unsigned long *value_bitmap) | |
5f424243 RI |
3391 | { |
3392 | if (!desc_array) | |
cf9af0d5 GU |
3393 | return -EINVAL; |
3394 | return gpiod_set_array_value_complex(false, false, array_size, | |
3395 | desc_array, array_info, | |
3396 | value_bitmap); | |
5f424243 | 3397 | } |
3fff99bc | 3398 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 3399 | |
d2876d08 | 3400 | /** |
79a9becd AC |
3401 | * gpiod_cansleep() - report whether gpio value access may sleep |
3402 | * @desc: gpio to check | |
d2876d08 | 3403 | * |
d2876d08 | 3404 | */ |
79a9becd | 3405 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 3406 | { |
fdeb8e15 LW |
3407 | VALIDATE_DESC(desc); |
3408 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 3409 | } |
79a9becd | 3410 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 3411 | |
90b39402 LW |
3412 | /** |
3413 | * gpiod_set_consumer_name() - set the consumer name for the descriptor | |
3414 | * @desc: gpio to set the consumer name on | |
3415 | * @name: the new consumer name | |
3416 | */ | |
18534df4 | 3417 | int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name) |
90b39402 | 3418 | { |
18534df4 MS |
3419 | VALIDATE_DESC(desc); |
3420 | if (name) { | |
3421 | name = kstrdup_const(name, GFP_KERNEL); | |
3422 | if (!name) | |
3423 | return -ENOMEM; | |
3424 | } | |
3425 | ||
3426 | kfree_const(desc->label); | |
3427 | desc_set_label(desc, name); | |
3428 | ||
3429 | return 0; | |
90b39402 LW |
3430 | } |
3431 | EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); | |
3432 | ||
0f6d504e | 3433 | /** |
79a9becd AC |
3434 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
3435 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 3436 | * |
79a9becd AC |
3437 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
3438 | * error. | |
0f6d504e | 3439 | */ |
79a9becd | 3440 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 3441 | { |
4c37ce86 LW |
3442 | struct gpio_chip *chip; |
3443 | int offset; | |
0f6d504e | 3444 | |
79bb71bd LW |
3445 | /* |
3446 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
3447 | * requires this function to not return zero on an invalid descriptor | |
3448 | * but rather a negative error number. | |
3449 | */ | |
bfbbe44d | 3450 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
3451 | return -EINVAL; |
3452 | ||
fdeb8e15 | 3453 | chip = desc->gdev->chip; |
372e722e | 3454 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
3455 | if (chip->to_irq) { |
3456 | int retirq = chip->to_irq(chip, offset); | |
3457 | ||
3458 | /* Zero means NO_IRQ */ | |
3459 | if (!retirq) | |
3460 | return -ENXIO; | |
3461 | ||
3462 | return retirq; | |
3463 | } | |
3464 | return -ENXIO; | |
0f6d504e | 3465 | } |
79a9becd | 3466 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 3467 | |
d468bf9e | 3468 | /** |
e3a2e878 | 3469 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
3470 | * @chip: the chip the GPIO to lock belongs to |
3471 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3472 | * |
3473 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 3474 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 3475 | */ |
e3a2e878 | 3476 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 3477 | { |
9c10280d LW |
3478 | struct gpio_desc *desc; |
3479 | ||
3480 | desc = gpiochip_get_desc(chip, offset); | |
3481 | if (IS_ERR(desc)) | |
3482 | return PTR_ERR(desc); | |
3483 | ||
60f8339e LW |
3484 | /* |
3485 | * If it's fast: flush the direction setting if something changed | |
3486 | * behind our back | |
3487 | */ | |
3488 | if (!chip->can_sleep && chip->get_direction) { | |
80956790 | 3489 | int dir = gpiod_get_direction(desc); |
9c10280d | 3490 | |
36b31279 AS |
3491 | if (dir < 0) { |
3492 | chip_err(chip, "%s: cannot get GPIO direction\n", | |
3493 | __func__); | |
3494 | return dir; | |
3495 | } | |
9c10280d | 3496 | } |
d468bf9e | 3497 | |
9c10280d | 3498 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 3499 | chip_err(chip, |
b1911710 AS |
3500 | "%s: tried to flag a GPIO set as output for IRQ\n", |
3501 | __func__); | |
d468bf9e LW |
3502 | return -EIO; |
3503 | } | |
3504 | ||
9c10280d | 3505 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
4e9439dd | 3506 | set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
3940c34a LW |
3507 | |
3508 | /* | |
3509 | * If the consumer has not set up a label (such as when the | |
3510 | * IRQ is referenced from .to_irq()) we set up a label here | |
3511 | * so it is clear this is used as an interrupt. | |
3512 | */ | |
3513 | if (!desc->label) | |
3514 | desc_set_label(desc, "interrupt"); | |
3515 | ||
d468bf9e | 3516 | return 0; |
372e722e | 3517 | } |
e3a2e878 | 3518 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 3519 | |
d468bf9e | 3520 | /** |
e3a2e878 | 3521 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
3522 | * @chip: the chip the GPIO to lock belongs to |
3523 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3524 | * |
3525 | * This is used directly by GPIO drivers that want to indicate | |
3526 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 3527 | */ |
e3a2e878 | 3528 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 3529 | { |
3940c34a LW |
3530 | struct gpio_desc *desc; |
3531 | ||
3532 | desc = gpiochip_get_desc(chip, offset); | |
3533 | if (IS_ERR(desc)) | |
d468bf9e | 3534 | return; |
d2876d08 | 3535 | |
3940c34a | 3536 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
4e9439dd | 3537 | clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
3940c34a LW |
3538 | |
3539 | /* If we only had this marking, erase it */ | |
3540 | if (desc->label && !strcmp(desc->label, "interrupt")) | |
3541 | desc_set_label(desc, NULL); | |
d468bf9e | 3542 | } |
e3a2e878 | 3543 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 3544 | |
4e9439dd HV |
3545 | void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset) |
3546 | { | |
3547 | struct gpio_desc *desc = gpiochip_get_desc(chip, offset); | |
3548 | ||
3549 | if (!IS_ERR(desc) && | |
3550 | !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) | |
3551 | clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); | |
3552 | } | |
3553 | EXPORT_SYMBOL_GPL(gpiochip_disable_irq); | |
3554 | ||
3555 | void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset) | |
3556 | { | |
3557 | struct gpio_desc *desc = gpiochip_get_desc(chip, offset); | |
3558 | ||
3559 | if (!IS_ERR(desc) && | |
3560 | !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) { | |
3561 | WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags)); | |
3562 | set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); | |
3563 | } | |
3564 | } | |
3565 | EXPORT_SYMBOL_GPL(gpiochip_enable_irq); | |
3566 | ||
6cee3821 LW |
3567 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
3568 | { | |
3569 | if (offset >= chip->ngpio) | |
3570 | return false; | |
3571 | ||
3572 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
3573 | } | |
3574 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
3575 | ||
4e6b8238 HV |
3576 | int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset) |
3577 | { | |
3578 | int ret; | |
3579 | ||
3580 | if (!try_module_get(chip->gpiodev->owner)) | |
3581 | return -ENODEV; | |
3582 | ||
3583 | ret = gpiochip_lock_as_irq(chip, offset); | |
3584 | if (ret) { | |
3585 | chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset); | |
3586 | module_put(chip->gpiodev->owner); | |
3587 | return ret; | |
3588 | } | |
3589 | return 0; | |
3590 | } | |
3591 | EXPORT_SYMBOL_GPL(gpiochip_reqres_irq); | |
3592 | ||
3593 | void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset) | |
3594 | { | |
3595 | gpiochip_unlock_as_irq(chip, offset); | |
3596 | module_put(chip->gpiodev->owner); | |
3597 | } | |
3598 | EXPORT_SYMBOL_GPL(gpiochip_relres_irq); | |
3599 | ||
143b65d6 LW |
3600 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
3601 | { | |
3602 | if (offset >= chip->ngpio) | |
3603 | return false; | |
3604 | ||
3605 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
3606 | } | |
3607 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
3608 | ||
3609 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
3610 | { | |
3611 | if (offset >= chip->ngpio) | |
3612 | return false; | |
3613 | ||
3614 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
3615 | } | |
3616 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
3617 | ||
05f479bf CK |
3618 | bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) |
3619 | { | |
3620 | if (offset >= chip->ngpio) | |
3621 | return false; | |
3622 | ||
e10f72bf | 3623 | return !test_bit(FLAG_TRANSITORY, &chip->gpiodev->descs[offset].flags); |
05f479bf CK |
3624 | } |
3625 | EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); | |
3626 | ||
79a9becd AC |
3627 | /** |
3628 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
3629 | * @desc: gpio whose value will be returned | |
3630 | * | |
3631 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 3632 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
3633 | * |
3634 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 3635 | */ |
79a9becd | 3636 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 3637 | { |
d2876d08 | 3638 | might_sleep_if(extra_checks); |
fdeb8e15 | 3639 | VALIDATE_DESC(desc); |
fac9d885 | 3640 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 3641 | } |
79a9becd | 3642 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 3643 | |
79a9becd AC |
3644 | /** |
3645 | * gpiod_get_value_cansleep() - return a gpio's value | |
3646 | * @desc: gpio whose value will be returned | |
3647 | * | |
3648 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 3649 | * account, or negative errno on failure. |
79a9becd AC |
3650 | * |
3651 | * This function is to be called from contexts that can sleep. | |
3652 | */ | |
3653 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 3654 | { |
3f397c21 | 3655 | int value; |
d2876d08 DB |
3656 | |
3657 | might_sleep_if(extra_checks); | |
fdeb8e15 | 3658 | VALIDATE_DESC(desc); |
fac9d885 | 3659 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
3660 | if (value < 0) |
3661 | return value; | |
3662 | ||
79a9becd AC |
3663 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3664 | value = !value; | |
3665 | ||
3f397c21 | 3666 | return value; |
d2876d08 | 3667 | } |
79a9becd | 3668 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 3669 | |
eec1d566 LW |
3670 | /** |
3671 | * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs | |
b9762beb | 3672 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3673 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3674 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3675 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3676 | * |
3677 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
3678 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
3679 | * else an error code. | |
3680 | * | |
3681 | * This function is to be called from contexts that can sleep. | |
3682 | */ | |
3683 | int gpiod_get_raw_array_value_cansleep(unsigned int array_size, | |
3684 | struct gpio_desc **desc_array, | |
77588c14 | 3685 | struct gpio_array *array_info, |
b9762beb | 3686 | unsigned long *value_bitmap) |
eec1d566 LW |
3687 | { |
3688 | might_sleep_if(extra_checks); | |
3689 | if (!desc_array) | |
3690 | return -EINVAL; | |
3691 | return gpiod_get_array_value_complex(true, true, array_size, | |
77588c14 JK |
3692 | desc_array, array_info, |
3693 | value_bitmap); | |
eec1d566 LW |
3694 | } |
3695 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep); | |
3696 | ||
3697 | /** | |
3698 | * gpiod_get_array_value_cansleep() - read values from an array of GPIOs | |
b9762beb | 3699 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3700 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3701 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3702 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3703 | * |
3704 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3705 | * into account. Return 0 in case of success, else an error code. | |
3706 | * | |
3707 | * This function is to be called from contexts that can sleep. | |
3708 | */ | |
3709 | int gpiod_get_array_value_cansleep(unsigned int array_size, | |
3710 | struct gpio_desc **desc_array, | |
77588c14 | 3711 | struct gpio_array *array_info, |
b9762beb | 3712 | unsigned long *value_bitmap) |
eec1d566 LW |
3713 | { |
3714 | might_sleep_if(extra_checks); | |
3715 | if (!desc_array) | |
3716 | return -EINVAL; | |
3717 | return gpiod_get_array_value_complex(false, true, array_size, | |
77588c14 JK |
3718 | desc_array, array_info, |
3719 | value_bitmap); | |
eec1d566 LW |
3720 | } |
3721 | EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep); | |
3722 | ||
79a9becd AC |
3723 | /** |
3724 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
3725 | * @desc: gpio whose value will be assigned | |
3726 | * @value: value to assign | |
3727 | * | |
3728 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
3729 | * regard for its ACTIVE_LOW status. | |
3730 | * | |
3731 | * This function is to be called from contexts that can sleep. | |
3732 | */ | |
3733 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 3734 | { |
d2876d08 | 3735 | might_sleep_if(extra_checks); |
fdeb8e15 | 3736 | VALIDATE_DESC_VOID(desc); |
fac9d885 | 3737 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 3738 | } |
79a9becd | 3739 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 3740 | |
79a9becd AC |
3741 | /** |
3742 | * gpiod_set_value_cansleep() - assign a gpio's value | |
3743 | * @desc: gpio whose value will be assigned | |
3744 | * @value: value to assign | |
3745 | * | |
3746 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
3747 | * account | |
3748 | * | |
3749 | * This function is to be called from contexts that can sleep. | |
3750 | */ | |
3751 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 3752 | { |
d2876d08 | 3753 | might_sleep_if(extra_checks); |
fdeb8e15 | 3754 | VALIDATE_DESC_VOID(desc); |
1e77fc82 | 3755 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3756 | } |
79a9becd | 3757 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 3758 | |
5f424243 | 3759 | /** |
3fff99bc | 3760 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
b9762beb | 3761 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3762 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3763 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3764 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3765 | * |
3766 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3767 | * without regard for their ACTIVE_LOW status. | |
3768 | * | |
3769 | * This function is to be called from contexts that can sleep. | |
3770 | */ | |
3027743f | 3771 | int gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
3c940660 GU |
3772 | struct gpio_desc **desc_array, |
3773 | struct gpio_array *array_info, | |
3774 | unsigned long *value_bitmap) | |
5f424243 RI |
3775 | { |
3776 | might_sleep_if(extra_checks); | |
3777 | if (!desc_array) | |
3027743f LA |
3778 | return -EINVAL; |
3779 | return gpiod_set_array_value_complex(true, true, array_size, desc_array, | |
77588c14 | 3780 | array_info, value_bitmap); |
5f424243 | 3781 | } |
3fff99bc | 3782 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 | 3783 | |
3946d187 DT |
3784 | /** |
3785 | * gpiod_add_lookup_tables() - register GPIO device consumers | |
3786 | * @tables: list of tables of consumers to register | |
3787 | * @n: number of tables in the list | |
3788 | */ | |
3789 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) | |
3790 | { | |
3791 | unsigned int i; | |
3792 | ||
3793 | mutex_lock(&gpio_lookup_lock); | |
3794 | ||
3795 | for (i = 0; i < n; i++) | |
3796 | list_add_tail(&tables[i]->list, &gpio_lookup_list); | |
3797 | ||
3798 | mutex_unlock(&gpio_lookup_lock); | |
3799 | } | |
3800 | ||
5f424243 | 3801 | /** |
3fff99bc | 3802 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
b9762beb | 3803 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3804 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3805 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3806 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3807 | * |
3808 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3809 | * into account. | |
3810 | * | |
3811 | * This function is to be called from contexts that can sleep. | |
3812 | */ | |
cf9af0d5 GU |
3813 | int gpiod_set_array_value_cansleep(unsigned int array_size, |
3814 | struct gpio_desc **desc_array, | |
3815 | struct gpio_array *array_info, | |
3816 | unsigned long *value_bitmap) | |
5f424243 RI |
3817 | { |
3818 | might_sleep_if(extra_checks); | |
3819 | if (!desc_array) | |
cf9af0d5 GU |
3820 | return -EINVAL; |
3821 | return gpiod_set_array_value_complex(false, true, array_size, | |
3822 | desc_array, array_info, | |
3823 | value_bitmap); | |
5f424243 | 3824 | } |
3fff99bc | 3825 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 3826 | |
bae48da2 | 3827 | /** |
ad824783 AC |
3828 | * gpiod_add_lookup_table() - register GPIO device consumers |
3829 | * @table: table of consumers to register | |
bae48da2 | 3830 | */ |
ad824783 | 3831 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
3832 | { |
3833 | mutex_lock(&gpio_lookup_lock); | |
3834 | ||
ad824783 | 3835 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
3836 | |
3837 | mutex_unlock(&gpio_lookup_lock); | |
3838 | } | |
226b2242 | 3839 | EXPORT_SYMBOL_GPL(gpiod_add_lookup_table); |
bae48da2 | 3840 | |
be9015ab SK |
3841 | /** |
3842 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
3843 | * @table: table of consumers to unregister | |
3844 | */ | |
3845 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
3846 | { | |
3847 | mutex_lock(&gpio_lookup_lock); | |
3848 | ||
3849 | list_del(&table->list); | |
3850 | ||
3851 | mutex_unlock(&gpio_lookup_lock); | |
3852 | } | |
226b2242 | 3853 | EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); |
be9015ab | 3854 | |
a411e81e BG |
3855 | /** |
3856 | * gpiod_add_hogs() - register a set of GPIO hogs from machine code | |
3857 | * @hogs: table of gpio hog entries with a zeroed sentinel at the end | |
3858 | */ | |
3859 | void gpiod_add_hogs(struct gpiod_hog *hogs) | |
3860 | { | |
3861 | struct gpio_chip *chip; | |
3862 | struct gpiod_hog *hog; | |
3863 | ||
3864 | mutex_lock(&gpio_machine_hogs_mutex); | |
3865 | ||
3866 | for (hog = &hogs[0]; hog->chip_label; hog++) { | |
3867 | list_add_tail(&hog->list, &gpio_machine_hogs); | |
3868 | ||
3869 | /* | |
3870 | * The chip may have been registered earlier, so check if it | |
3871 | * exists and, if so, try to hog the line now. | |
3872 | */ | |
3873 | chip = find_chip_by_name(hog->chip_label); | |
3874 | if (chip) | |
3875 | gpiochip_machine_hog(chip, hog); | |
3876 | } | |
3877 | ||
3878 | mutex_unlock(&gpio_machine_hogs_mutex); | |
3879 | } | |
3880 | EXPORT_SYMBOL_GPL(gpiod_add_hogs); | |
3881 | ||
ad824783 | 3882 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
3883 | { |
3884 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 3885 | struct gpiod_lookup_table *table; |
bae48da2 AC |
3886 | |
3887 | mutex_lock(&gpio_lookup_lock); | |
3888 | ||
ad824783 AC |
3889 | list_for_each_entry(table, &gpio_lookup_list, list) { |
3890 | if (table->dev_id && dev_id) { | |
3891 | /* | |
3892 | * Valid strings on both ends, must be identical to have | |
3893 | * a match | |
3894 | */ | |
3895 | if (!strcmp(table->dev_id, dev_id)) | |
3896 | goto found; | |
3897 | } else { | |
3898 | /* | |
3899 | * One of the pointers is NULL, so both must be to have | |
3900 | * a match | |
3901 | */ | |
3902 | if (dev_id == table->dev_id) | |
3903 | goto found; | |
3904 | } | |
3905 | } | |
3906 | table = NULL; | |
bae48da2 | 3907 | |
ad824783 AC |
3908 | found: |
3909 | mutex_unlock(&gpio_lookup_lock); | |
3910 | return table; | |
3911 | } | |
bae48da2 | 3912 | |
ad824783 AC |
3913 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
3914 | unsigned int idx, | |
3915 | enum gpio_lookup_flags *flags) | |
3916 | { | |
2a3cf6a3 | 3917 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
3918 | struct gpiod_lookup_table *table; |
3919 | struct gpiod_lookup *p; | |
bae48da2 | 3920 | |
ad824783 AC |
3921 | table = gpiod_find_lookup_table(dev); |
3922 | if (!table) | |
3923 | return desc; | |
bae48da2 | 3924 | |
ad824783 AC |
3925 | for (p = &table->table[0]; p->chip_label; p++) { |
3926 | struct gpio_chip *chip; | |
bae48da2 | 3927 | |
ad824783 | 3928 | /* idx must always match exactly */ |
bae48da2 AC |
3929 | if (p->idx != idx) |
3930 | continue; | |
3931 | ||
ad824783 AC |
3932 | /* If the lookup entry has a con_id, require exact match */ |
3933 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
3934 | continue; | |
bae48da2 | 3935 | |
ad824783 | 3936 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 3937 | |
ad824783 | 3938 | if (!chip) { |
8853daf3 JK |
3939 | /* |
3940 | * As the lookup table indicates a chip with | |
3941 | * p->chip_label should exist, assume it may | |
3942 | * still appear later and let the interested | |
3943 | * consumer be probed again or let the Deferred | |
3944 | * Probe infrastructure handle the error. | |
3945 | */ | |
3946 | dev_warn(dev, "cannot find GPIO chip %s, deferring\n", | |
3947 | p->chip_label); | |
3948 | return ERR_PTR(-EPROBE_DEFER); | |
ad824783 | 3949 | } |
bae48da2 | 3950 | |
ad824783 | 3951 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
3952 | dev_err(dev, |
3953 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
3954 | idx, chip->ngpio, chip->label); | |
3955 | return ERR_PTR(-EINVAL); | |
bae48da2 | 3956 | } |
bae48da2 | 3957 | |
bb1e88cc | 3958 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 3959 | *flags = p->flags; |
bae48da2 | 3960 | |
2a3cf6a3 | 3961 | return desc; |
bae48da2 AC |
3962 | } |
3963 | ||
bae48da2 AC |
3964 | return desc; |
3965 | } | |
3966 | ||
66858527 RI |
3967 | static int dt_gpio_count(struct device *dev, const char *con_id) |
3968 | { | |
3969 | int ret; | |
3970 | char propname[32]; | |
3971 | unsigned int i; | |
3972 | ||
3973 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
3974 | if (con_id) | |
3975 | snprintf(propname, sizeof(propname), "%s-%s", | |
3976 | con_id, gpio_suffixes[i]); | |
3977 | else | |
3978 | snprintf(propname, sizeof(propname), "%s", | |
3979 | gpio_suffixes[i]); | |
3980 | ||
3981 | ret = of_gpio_named_count(dev->of_node, propname); | |
4033d4a4 | 3982 | if (ret > 0) |
66858527 RI |
3983 | break; |
3984 | } | |
4033d4a4 | 3985 | return ret ? ret : -ENOENT; |
66858527 RI |
3986 | } |
3987 | ||
3988 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
3989 | { | |
3990 | struct gpiod_lookup_table *table; | |
3991 | struct gpiod_lookup *p; | |
3992 | unsigned int count = 0; | |
3993 | ||
3994 | table = gpiod_find_lookup_table(dev); | |
3995 | if (!table) | |
3996 | return -ENOENT; | |
3997 | ||
3998 | for (p = &table->table[0]; p->chip_label; p++) { | |
3999 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
4000 | (!con_id && !p->con_id)) | |
4001 | count++; | |
4002 | } | |
4003 | if (!count) | |
4004 | return -ENOENT; | |
4005 | ||
4006 | return count; | |
4007 | } | |
4008 | ||
4009 | /** | |
4010 | * gpiod_count - return the number of GPIOs associated with a device / function | |
4011 | * or -ENOENT if no GPIO has been assigned to the requested function | |
4012 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4013 | * @con_id: function within the GPIO consumer | |
4014 | */ | |
4015 | int gpiod_count(struct device *dev, const char *con_id) | |
4016 | { | |
4017 | int count = -ENOENT; | |
4018 | ||
4019 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
4020 | count = dt_gpio_count(dev, con_id); | |
4021 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
4022 | count = acpi_gpio_count(dev, con_id); | |
4023 | ||
4024 | if (count < 0) | |
4025 | count = platform_gpio_count(dev, con_id); | |
4026 | ||
4027 | return count; | |
4028 | } | |
4029 | EXPORT_SYMBOL_GPL(gpiod_count); | |
4030 | ||
bae48da2 | 4031 | /** |
0879162f | 4032 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 4033 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 4034 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 4035 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
4036 | * |
4037 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 4038 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 4039 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 4040 | */ |
b17d1bf1 | 4041 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 4042 | enum gpiod_flags flags) |
bae48da2 | 4043 | { |
39b2bbe3 | 4044 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 4045 | } |
b17d1bf1 | 4046 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 4047 | |
29a1f233 TR |
4048 | /** |
4049 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
4050 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4051 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 4052 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
4053 | * |
4054 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
4055 | * the requested function it will return NULL. This is convenient for drivers | |
4056 | * that need to handle optional GPIOs. | |
4057 | */ | |
b17d1bf1 | 4058 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
4059 | const char *con_id, |
4060 | enum gpiod_flags flags) | |
29a1f233 | 4061 | { |
39b2bbe3 | 4062 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 4063 | } |
b17d1bf1 | 4064 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 4065 | |
f625d460 BP |
4066 | |
4067 | /** | |
4068 | * gpiod_configure_flags - helper function to configure a given GPIO | |
4069 | * @desc: gpio whose value will be assigned | |
4070 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
4071 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
4072 | * of_get_gpio_hog() | |
f625d460 BP |
4073 | * @dflags: gpiod_flags - optional GPIO initialization flags |
4074 | * | |
4075 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
4076 | * requested function and/or index, or another IS_ERR() code if an error | |
4077 | * occurred while trying to acquire the GPIO. | |
4078 | */ | |
c29fd9eb | 4079 | int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
85b03b30 | 4080 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
4081 | { |
4082 | int status; | |
4083 | ||
85b03b30 JH |
4084 | if (lflags & GPIO_ACTIVE_LOW) |
4085 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
f926dfc1 | 4086 | |
85b03b30 JH |
4087 | if (lflags & GPIO_OPEN_DRAIN) |
4088 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
f926dfc1 LW |
4089 | else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) { |
4090 | /* | |
4091 | * This enforces open drain mode from the consumer side. | |
4092 | * This is necessary for some busses like I2C, but the lookup | |
4093 | * should *REALLY* have specified them as open drain in the | |
4094 | * first place, so print a little warning here. | |
4095 | */ | |
4096 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
4097 | gpiod_warn(desc, | |
4098 | "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n"); | |
4099 | } | |
4100 | ||
85b03b30 JH |
4101 | if (lflags & GPIO_OPEN_SOURCE) |
4102 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
e10f72bf | 4103 | |
d449991c TP |
4104 | if ((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DOWN)) { |
4105 | gpiod_err(desc, | |
4106 | "both pull-up and pull-down enabled, invalid configuration\n"); | |
4107 | return -EINVAL; | |
4108 | } | |
4109 | ||
4110 | if (lflags & GPIO_PULL_UP) | |
4111 | set_bit(FLAG_PULL_UP, &desc->flags); | |
4112 | else if (lflags & GPIO_PULL_DOWN) | |
4113 | set_bit(FLAG_PULL_DOWN, &desc->flags); | |
4114 | ||
e10f72bf AJ |
4115 | status = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY)); |
4116 | if (status < 0) | |
4117 | return status; | |
85b03b30 | 4118 | |
f625d460 BP |
4119 | /* No particular flag request, return here... */ |
4120 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
4121 | pr_debug("no flags found for %s\n", con_id); | |
4122 | return 0; | |
4123 | } | |
4124 | ||
4125 | /* Process flags */ | |
4126 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
4127 | status = gpiod_direction_output(desc, | |
ad17731d | 4128 | !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
f625d460 BP |
4129 | else |
4130 | status = gpiod_direction_input(desc); | |
4131 | ||
4132 | return status; | |
4133 | } | |
4134 | ||
bae48da2 AC |
4135 | /** |
4136 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 4137 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
4138 | * @con_id: function within the GPIO consumer |
4139 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 4140 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
4141 | * |
4142 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
4143 | * defined one for functions that define several GPIOs. | |
4144 | * | |
2a3cf6a3 AC |
4145 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
4146 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 4147 | * occurred while trying to acquire the GPIO. |
bae48da2 | 4148 | */ |
b17d1bf1 | 4149 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 4150 | const char *con_id, |
39b2bbe3 AC |
4151 | unsigned int idx, |
4152 | enum gpiod_flags flags) | |
bae48da2 | 4153 | { |
35c5d7fd | 4154 | struct gpio_desc *desc = NULL; |
bae48da2 | 4155 | int status; |
39b2bbe3 | 4156 | enum gpio_lookup_flags lookupflags = 0; |
7d18f0a1 LW |
4157 | /* Maybe we have a device name, maybe not */ |
4158 | const char *devname = dev ? dev_name(dev) : "?"; | |
bae48da2 AC |
4159 | |
4160 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
4161 | ||
4d8440b9 RW |
4162 | if (dev) { |
4163 | /* Using device tree? */ | |
4164 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
4165 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
4166 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
4167 | } else if (ACPI_COMPANION(dev)) { | |
4168 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
a31f5c3a | 4169 | desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); |
4d8440b9 | 4170 | } |
35c5d7fd AC |
4171 | } |
4172 | ||
4173 | /* | |
4174 | * Either we are not using DT or ACPI, or their lookup did not return | |
4175 | * a result. In that case, use platform lookup as a fallback. | |
4176 | */ | |
2a3cf6a3 | 4177 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 4178 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 4179 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
4180 | } |
4181 | ||
4182 | if (IS_ERR(desc)) { | |
9d5a1f2c | 4183 | dev_dbg(dev, "No GPIO consumer %s found\n", con_id); |
bae48da2 AC |
4184 | return desc; |
4185 | } | |
4186 | ||
7d18f0a1 LW |
4187 | /* |
4188 | * If a connection label was passed use that, else attempt to use | |
4189 | * the device name as label | |
4190 | */ | |
4191 | status = gpiod_request(desc, con_id ? con_id : devname); | |
b0ce7b29 LW |
4192 | if (status < 0) { |
4193 | if (status == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) { | |
4194 | /* | |
4195 | * This happens when there are several consumers for | |
4196 | * the same GPIO line: we just return here without | |
4197 | * further initialization. It is a bit if a hack. | |
4198 | * This is necessary to support fixed regulators. | |
4199 | * | |
4200 | * FIXME: Make this more sane and safe. | |
4201 | */ | |
4202 | dev_info(dev, "nonexclusive access to GPIO for %s\n", | |
4203 | con_id ? con_id : devname); | |
4204 | return desc; | |
4205 | } else { | |
4206 | return ERR_PTR(status); | |
4207 | } | |
4208 | } | |
bae48da2 | 4209 | |
85b03b30 | 4210 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
4211 | if (status < 0) { |
4212 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
4213 | gpiod_put(desc); | |
4214 | return ERR_PTR(status); | |
4215 | } | |
4216 | ||
bae48da2 AC |
4217 | return desc; |
4218 | } | |
b17d1bf1 | 4219 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 4220 | |
6392cca4 LW |
4221 | /** |
4222 | * gpiod_get_from_of_node() - obtain a GPIO from an OF node | |
4223 | * @node: handle of the OF node | |
4224 | * @propname: name of the DT property representing the GPIO | |
4225 | * @index: index of the GPIO to obtain for the consumer | |
4226 | * @dflags: GPIO initialization flags | |
4227 | * @label: label to attach to the requested GPIO | |
4228 | * | |
4229 | * Returns: | |
4230 | * On successful request the GPIO pin is configured in accordance with | |
4231 | * provided @dflags. If the node does not have the requested GPIO | |
4232 | * property, NULL is returned. | |
4233 | * | |
4234 | * In case of error an ERR_PTR() is returned. | |
4235 | */ | |
92542edc LW |
4236 | struct gpio_desc *gpiod_get_from_of_node(struct device_node *node, |
4237 | const char *propname, int index, | |
4238 | enum gpiod_flags dflags, | |
4239 | const char *label) | |
6392cca4 | 4240 | { |
40a3c9db | 4241 | struct gpio_desc *desc; |
6392cca4 LW |
4242 | unsigned long lflags = 0; |
4243 | enum of_gpio_flags flags; | |
4244 | bool active_low = false; | |
4245 | bool single_ended = false; | |
4246 | bool open_drain = false; | |
4247 | bool transitory = false; | |
4248 | int ret; | |
4249 | ||
4250 | desc = of_get_named_gpiod_flags(node, propname, | |
4251 | index, &flags); | |
4252 | ||
4253 | if (!desc || IS_ERR(desc)) { | |
4254 | /* If it is not there, just return NULL */ | |
4255 | if (PTR_ERR(desc) == -ENOENT) | |
4256 | return NULL; | |
4257 | return desc; | |
4258 | } | |
4259 | ||
4260 | active_low = flags & OF_GPIO_ACTIVE_LOW; | |
4261 | single_ended = flags & OF_GPIO_SINGLE_ENDED; | |
4262 | open_drain = flags & OF_GPIO_OPEN_DRAIN; | |
4263 | transitory = flags & OF_GPIO_TRANSITORY; | |
4264 | ||
4265 | ret = gpiod_request(desc, label); | |
ec757001 LW |
4266 | if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE)) |
4267 | return desc; | |
6392cca4 LW |
4268 | if (ret) |
4269 | return ERR_PTR(ret); | |
4270 | ||
4271 | if (active_low) | |
4272 | lflags |= GPIO_ACTIVE_LOW; | |
4273 | ||
4274 | if (single_ended) { | |
4275 | if (open_drain) | |
4276 | lflags |= GPIO_OPEN_DRAIN; | |
4277 | else | |
4278 | lflags |= GPIO_OPEN_SOURCE; | |
4279 | } | |
4280 | ||
4281 | if (transitory) | |
4282 | lflags |= GPIO_TRANSITORY; | |
4283 | ||
4284 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); | |
4285 | if (ret < 0) { | |
4286 | gpiod_put(desc); | |
4287 | return ERR_PTR(ret); | |
4288 | } | |
4289 | ||
4290 | return desc; | |
4291 | } | |
92542edc | 4292 | EXPORT_SYMBOL(gpiod_get_from_of_node); |
6392cca4 | 4293 | |
40b73183 MW |
4294 | /** |
4295 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
4296 | * @fwnode: handle of the firmware node | |
4297 | * @propname: name of the firmware property representing the GPIO | |
6392cca4 | 4298 | * @index: index of the GPIO to obtain for the consumer |
a264d10f | 4299 | * @dflags: GPIO initialization flags |
950d55f5 | 4300 | * @label: label to attach to the requested GPIO |
40b73183 MW |
4301 | * |
4302 | * This function can be used for drivers that get their configuration | |
6392cca4 | 4303 | * from opaque firmware. |
40b73183 | 4304 | * |
6392cca4 | 4305 | * The function properly finds the corresponding GPIO using whatever is the |
40b73183 MW |
4306 | * underlying firmware interface and then makes sure that the GPIO |
4307 | * descriptor is requested before it is returned to the caller. | |
4308 | * | |
950d55f5 | 4309 | * Returns: |
ff21378a | 4310 | * On successful request the GPIO pin is configured in accordance with |
a264d10f AS |
4311 | * provided @dflags. |
4312 | * | |
40b73183 MW |
4313 | * In case of error an ERR_PTR() is returned. |
4314 | */ | |
4315 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
537b94da | 4316 | const char *propname, int index, |
b2987d74 AS |
4317 | enum gpiod_flags dflags, |
4318 | const char *label) | |
40b73183 MW |
4319 | { |
4320 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
a264d10f | 4321 | unsigned long lflags = 0; |
40b73183 MW |
4322 | int ret; |
4323 | ||
4324 | if (!fwnode) | |
4325 | return ERR_PTR(-EINVAL); | |
4326 | ||
4327 | if (is_of_node(fwnode)) { | |
6392cca4 LW |
4328 | desc = gpiod_get_from_of_node(to_of_node(fwnode), |
4329 | propname, index, | |
4330 | dflags, | |
4331 | label); | |
4332 | return desc; | |
40b73183 MW |
4333 | } else if (is_acpi_node(fwnode)) { |
4334 | struct acpi_gpio_info info; | |
4335 | ||
537b94da | 4336 | desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
6392cca4 LW |
4337 | if (IS_ERR(desc)) |
4338 | return desc; | |
40b73183 | 4339 | |
6392cca4 | 4340 | acpi_gpio_update_gpiod_flags(&dflags, &info); |
40b73183 | 4341 | |
6392cca4 LW |
4342 | if (info.polarity == GPIO_ACTIVE_LOW) |
4343 | lflags |= GPIO_ACTIVE_LOW; | |
4344 | } | |
40b73183 | 4345 | |
6392cca4 | 4346 | /* Currently only ACPI takes this path */ |
b2987d74 | 4347 | ret = gpiod_request(desc, label); |
85b03b30 JH |
4348 | if (ret) |
4349 | return ERR_PTR(ret); | |
4350 | ||
a264d10f AS |
4351 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
4352 | if (ret < 0) { | |
4353 | gpiod_put(desc); | |
4354 | return ERR_PTR(ret); | |
90b665f6 LP |
4355 | } |
4356 | ||
40b73183 MW |
4357 | return desc; |
4358 | } | |
4359 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
4360 | ||
29a1f233 TR |
4361 | /** |
4362 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
4363 | * function | |
4364 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4365 | * @con_id: function within the GPIO consumer | |
4366 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 4367 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
4368 | * |
4369 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
4370 | * specified index was assigned to the requested function it will return NULL. | |
4371 | * This is convenient for drivers that need to handle optional GPIOs. | |
4372 | */ | |
b17d1bf1 | 4373 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 4374 | const char *con_id, |
39b2bbe3 AC |
4375 | unsigned int index, |
4376 | enum gpiod_flags flags) | |
29a1f233 TR |
4377 | { |
4378 | struct gpio_desc *desc; | |
4379 | ||
39b2bbe3 | 4380 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
4381 | if (IS_ERR(desc)) { |
4382 | if (PTR_ERR(desc) == -ENOENT) | |
4383 | return NULL; | |
4384 | } | |
4385 | ||
4386 | return desc; | |
4387 | } | |
b17d1bf1 | 4388 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 4389 | |
f625d460 BP |
4390 | /** |
4391 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
4392 | * @desc: gpio whose value will be assigned | |
4393 | * @name: gpio line name | |
4394 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
4395 | * of_get_gpio_hog() | |
4396 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
4397 | */ | |
4398 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
4399 | unsigned long lflags, enum gpiod_flags dflags) | |
4400 | { | |
4401 | struct gpio_chip *chip; | |
4402 | struct gpio_desc *local_desc; | |
4403 | int hwnum; | |
4404 | int status; | |
4405 | ||
4406 | chip = gpiod_to_chip(desc); | |
4407 | hwnum = gpio_chip_hwgpio(desc); | |
4408 | ||
21abf103 LW |
4409 | /* |
4410 | * FIXME: not very elegant that we call gpiod_configure_flags() | |
4411 | * twice here (once inside gpiochip_request_own_desc() and | |
4412 | * again here), but the gpiochip_request_own_desc() is external | |
4413 | * and cannot really pass the lflags so this is the lesser evil | |
4414 | * at the moment. Pass zero as dflags on this first call so we | |
4415 | * don't screw anything up. | |
4416 | */ | |
4417 | local_desc = gpiochip_request_own_desc(chip, hwnum, name, 0); | |
f625d460 | 4418 | if (IS_ERR(local_desc)) { |
c31a571d LD |
4419 | status = PTR_ERR(local_desc); |
4420 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
4421 | name, chip->label, hwnum, status); | |
4422 | return status; | |
f625d460 BP |
4423 | } |
4424 | ||
85b03b30 | 4425 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 4426 | if (status < 0) { |
c31a571d LD |
4427 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
4428 | name, chip->label, hwnum, status); | |
f625d460 BP |
4429 | gpiochip_free_own_desc(desc); |
4430 | return status; | |
4431 | } | |
4432 | ||
4433 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
4434 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
4435 | ||
4436 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
4437 | desc_to_gpio(desc), name, | |
4438 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
4439 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
4440 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
4441 | ||
4442 | return 0; | |
4443 | } | |
4444 | ||
4445 | /** | |
4446 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
4447 | * @chip: gpio chip to act on | |
4448 | * | |
4449 | * This is only used by of_gpiochip_remove to free hogged gpios | |
4450 | */ | |
4451 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
4452 | { | |
4453 | int id; | |
4454 | ||
4455 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
4456 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
4457 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
4458 | } |
4459 | } | |
4460 | ||
66858527 RI |
4461 | /** |
4462 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
4463 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4464 | * @con_id: function within the GPIO consumer | |
4465 | * @flags: optional GPIO initialization flags | |
4466 | * | |
4467 | * This function acquires all the GPIOs defined under a given function. | |
4468 | * | |
4469 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
4470 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
4471 | * code if an error occurred while trying to acquire the GPIOs. | |
4472 | */ | |
4473 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
4474 | const char *con_id, | |
4475 | enum gpiod_flags flags) | |
4476 | { | |
4477 | struct gpio_desc *desc; | |
4478 | struct gpio_descs *descs; | |
bf9346f5 JK |
4479 | struct gpio_array *array_info = NULL; |
4480 | struct gpio_chip *chip; | |
4481 | int count, bitmap_size; | |
66858527 RI |
4482 | |
4483 | count = gpiod_count(dev, con_id); | |
4484 | if (count < 0) | |
4485 | return ERR_PTR(count); | |
4486 | ||
acafe7e3 | 4487 | descs = kzalloc(struct_size(descs, desc, count), GFP_KERNEL); |
66858527 RI |
4488 | if (!descs) |
4489 | return ERR_PTR(-ENOMEM); | |
4490 | ||
4491 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
4492 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
4493 | if (IS_ERR(desc)) { | |
4494 | gpiod_put_array(descs); | |
4495 | return ERR_CAST(desc); | |
4496 | } | |
bf9346f5 | 4497 | |
66858527 | 4498 | descs->desc[descs->ndescs] = desc; |
bf9346f5 JK |
4499 | |
4500 | chip = gpiod_to_chip(desc); | |
4501 | /* | |
c4c958aa JK |
4502 | * If pin hardware number of array member 0 is also 0, select |
4503 | * its chip as a candidate for fast bitmap processing path. | |
bf9346f5 | 4504 | */ |
c4c958aa | 4505 | if (descs->ndescs == 0 && gpio_chip_hwgpio(desc) == 0) { |
bf9346f5 JK |
4506 | struct gpio_descs *array; |
4507 | ||
4508 | bitmap_size = BITS_TO_LONGS(chip->ngpio > count ? | |
4509 | chip->ngpio : count); | |
4510 | ||
4511 | array = kzalloc(struct_size(descs, desc, count) + | |
4512 | struct_size(array_info, invert_mask, | |
4513 | 3 * bitmap_size), GFP_KERNEL); | |
4514 | if (!array) { | |
4515 | gpiod_put_array(descs); | |
4516 | return ERR_PTR(-ENOMEM); | |
4517 | } | |
4518 | ||
4519 | memcpy(array, descs, | |
4520 | struct_size(descs, desc, descs->ndescs + 1)); | |
4521 | kfree(descs); | |
4522 | ||
4523 | descs = array; | |
4524 | array_info = (void *)(descs->desc + count); | |
4525 | array_info->get_mask = array_info->invert_mask + | |
4526 | bitmap_size; | |
4527 | array_info->set_mask = array_info->get_mask + | |
4528 | bitmap_size; | |
4529 | ||
4530 | array_info->desc = descs->desc; | |
4531 | array_info->size = count; | |
4532 | array_info->chip = chip; | |
4533 | bitmap_set(array_info->get_mask, descs->ndescs, | |
4534 | count - descs->ndescs); | |
4535 | bitmap_set(array_info->set_mask, descs->ndescs, | |
4536 | count - descs->ndescs); | |
4537 | descs->info = array_info; | |
4538 | } | |
c4c958aa JK |
4539 | /* Unmark array members which don't belong to the 'fast' chip */ |
4540 | if (array_info && array_info->chip != chip) { | |
bf9346f5 JK |
4541 | __clear_bit(descs->ndescs, array_info->get_mask); |
4542 | __clear_bit(descs->ndescs, array_info->set_mask); | |
c4c958aa JK |
4543 | } |
4544 | /* | |
4545 | * Detect array members which belong to the 'fast' chip | |
4546 | * but their pins are not in hardware order. | |
4547 | */ | |
4548 | else if (array_info && | |
4549 | gpio_chip_hwgpio(desc) != descs->ndescs) { | |
4550 | /* | |
4551 | * Don't use fast path if all array members processed so | |
4552 | * far belong to the same chip as this one but its pin | |
4553 | * hardware number is different from its array index. | |
4554 | */ | |
4555 | if (bitmap_full(array_info->get_mask, descs->ndescs)) { | |
4556 | array_info = NULL; | |
4557 | } else { | |
4558 | __clear_bit(descs->ndescs, | |
4559 | array_info->get_mask); | |
4560 | __clear_bit(descs->ndescs, | |
4561 | array_info->set_mask); | |
4562 | } | |
bf9346f5 JK |
4563 | } else if (array_info) { |
4564 | /* Exclude open drain or open source from fast output */ | |
4565 | if (gpiochip_line_is_open_drain(chip, descs->ndescs) || | |
4566 | gpiochip_line_is_open_source(chip, descs->ndescs)) | |
4567 | __clear_bit(descs->ndescs, | |
4568 | array_info->set_mask); | |
4569 | /* Identify 'fast' pins which require invertion */ | |
4570 | if (gpiod_is_active_low(desc)) | |
4571 | __set_bit(descs->ndescs, | |
4572 | array_info->invert_mask); | |
4573 | } | |
4574 | ||
66858527 RI |
4575 | descs->ndescs++; |
4576 | } | |
bf9346f5 JK |
4577 | if (array_info) |
4578 | dev_dbg(dev, | |
4579 | "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n", | |
4580 | array_info->chip->label, array_info->size, | |
4581 | *array_info->get_mask, *array_info->set_mask, | |
4582 | *array_info->invert_mask); | |
66858527 RI |
4583 | return descs; |
4584 | } | |
4585 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
4586 | ||
4587 | /** | |
4588 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
4589 | * function | |
4590 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4591 | * @con_id: function within the GPIO consumer | |
4592 | * @flags: optional GPIO initialization flags | |
4593 | * | |
4594 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
4595 | * assigned to the requested function it will return NULL. | |
4596 | */ | |
4597 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
4598 | const char *con_id, | |
4599 | enum gpiod_flags flags) | |
4600 | { | |
4601 | struct gpio_descs *descs; | |
4602 | ||
4603 | descs = gpiod_get_array(dev, con_id, flags); | |
4604 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
4605 | return NULL; | |
4606 | ||
4607 | return descs; | |
4608 | } | |
4609 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
4610 | ||
bae48da2 AC |
4611 | /** |
4612 | * gpiod_put - dispose of a GPIO descriptor | |
4613 | * @desc: GPIO descriptor to dispose of | |
4614 | * | |
4615 | * No descriptor can be used after gpiod_put() has been called on it. | |
4616 | */ | |
4617 | void gpiod_put(struct gpio_desc *desc) | |
4618 | { | |
4619 | gpiod_free(desc); | |
372e722e | 4620 | } |
bae48da2 | 4621 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 4622 | |
66858527 RI |
4623 | /** |
4624 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
4625 | * @descs: struct gpio_descs containing an array of descriptors | |
4626 | */ | |
4627 | void gpiod_put_array(struct gpio_descs *descs) | |
4628 | { | |
4629 | unsigned int i; | |
4630 | ||
4631 | for (i = 0; i < descs->ndescs; i++) | |
4632 | gpiod_put(descs->desc[i]); | |
4633 | ||
4634 | kfree(descs); | |
4635 | } | |
4636 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
4637 | ||
3c702e99 LW |
4638 | static int __init gpiolib_dev_init(void) |
4639 | { | |
4640 | int ret; | |
4641 | ||
4642 | /* Register GPIO sysfs bus */ | |
b1911710 | 4643 | ret = bus_register(&gpio_bus_type); |
3c702e99 LW |
4644 | if (ret < 0) { |
4645 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
4646 | return ret; | |
4647 | } | |
4648 | ||
4649 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
4650 | if (ret < 0) { | |
4651 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
4652 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
4653 | } else { |
4654 | gpiolib_initialized = true; | |
4655 | gpiochip_setup_devs(); | |
3c702e99 LW |
4656 | } |
4657 | return ret; | |
4658 | } | |
4659 | core_initcall(gpiolib_dev_init); | |
4660 | ||
d2876d08 DB |
4661 | #ifdef CONFIG_DEBUG_FS |
4662 | ||
fdeb8e15 | 4663 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
4664 | { |
4665 | unsigned i; | |
fdeb8e15 LW |
4666 | struct gpio_chip *chip = gdev->chip; |
4667 | unsigned gpio = gdev->base; | |
4668 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
90fd2270 LW |
4669 | bool is_out; |
4670 | bool is_irq; | |
4671 | bool active_low; | |
d2876d08 | 4672 | |
fdeb8e15 | 4673 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
4674 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
4675 | if (gdesc->name) { | |
4676 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
4677 | gpio, gdesc->name); | |
4678 | } | |
d2876d08 | 4679 | continue; |
ced433e2 | 4680 | } |
d2876d08 | 4681 | |
372e722e | 4682 | gpiod_get_direction(gdesc); |
d2876d08 | 4683 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 4684 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
90fd2270 LW |
4685 | active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags); |
4686 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s", | |
ced433e2 | 4687 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, |
d2876d08 | 4688 | is_out ? "out" : "in ", |
1c22a252 | 4689 | chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "? ", |
90fd2270 LW |
4690 | is_irq ? "IRQ " : "", |
4691 | active_low ? "ACTIVE LOW" : ""); | |
d2876d08 DB |
4692 | seq_printf(s, "\n"); |
4693 | } | |
4694 | } | |
4695 | ||
f9c4a31f | 4696 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 4697 | { |
362432ae | 4698 | unsigned long flags; |
ff2b1359 | 4699 | struct gpio_device *gdev = NULL; |
cb1650d4 | 4700 | loff_t index = *pos; |
d2876d08 | 4701 | |
f9c4a31f | 4702 | s->private = ""; |
d2876d08 | 4703 | |
362432ae | 4704 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4705 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
4706 | if (index-- == 0) { |
4707 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 4708 | return gdev; |
f9c4a31f | 4709 | } |
362432ae | 4710 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 4711 | |
cb1650d4 | 4712 | return NULL; |
f9c4a31f TR |
4713 | } |
4714 | ||
4715 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
4716 | { | |
362432ae | 4717 | unsigned long flags; |
ff2b1359 | 4718 | struct gpio_device *gdev = v; |
f9c4a31f TR |
4719 | void *ret = NULL; |
4720 | ||
362432ae | 4721 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4722 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
4723 | ret = NULL; |
4724 | else | |
ff2b1359 | 4725 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 4726 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
4727 | |
4728 | s->private = "\n"; | |
4729 | ++*pos; | |
4730 | ||
4731 | return ret; | |
4732 | } | |
4733 | ||
4734 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
4735 | { | |
4736 | } | |
4737 | ||
4738 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
4739 | { | |
ff2b1359 LW |
4740 | struct gpio_device *gdev = v; |
4741 | struct gpio_chip *chip = gdev->chip; | |
4742 | struct device *parent; | |
4743 | ||
4744 | if (!chip) { | |
4745 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
4746 | dev_name(&gdev->dev)); | |
4747 | return 0; | |
4748 | } | |
f9c4a31f | 4749 | |
ff2b1359 LW |
4750 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
4751 | dev_name(&gdev->dev), | |
fdeb8e15 | 4752 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
4753 | parent = chip->parent; |
4754 | if (parent) | |
4755 | seq_printf(s, ", parent: %s/%s", | |
4756 | parent->bus ? parent->bus->name : "no-bus", | |
4757 | dev_name(parent)); | |
f9c4a31f TR |
4758 | if (chip->label) |
4759 | seq_printf(s, ", %s", chip->label); | |
4760 | if (chip->can_sleep) | |
4761 | seq_printf(s, ", can sleep"); | |
4762 | seq_printf(s, ":\n"); | |
4763 | ||
4764 | if (chip->dbg_show) | |
4765 | chip->dbg_show(s, chip); | |
4766 | else | |
fdeb8e15 | 4767 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 4768 | |
d2876d08 DB |
4769 | return 0; |
4770 | } | |
4771 | ||
f9c4a31f TR |
4772 | static const struct seq_operations gpiolib_seq_ops = { |
4773 | .start = gpiolib_seq_start, | |
4774 | .next = gpiolib_seq_next, | |
4775 | .stop = gpiolib_seq_stop, | |
4776 | .show = gpiolib_seq_show, | |
4777 | }; | |
4778 | ||
d2876d08 DB |
4779 | static int gpiolib_open(struct inode *inode, struct file *file) |
4780 | { | |
f9c4a31f | 4781 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
4782 | } |
4783 | ||
828c0950 | 4784 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 4785 | .owner = THIS_MODULE, |
d2876d08 DB |
4786 | .open = gpiolib_open, |
4787 | .read = seq_read, | |
4788 | .llseek = seq_lseek, | |
f9c4a31f | 4789 | .release = seq_release, |
d2876d08 DB |
4790 | }; |
4791 | ||
4792 | static int __init gpiolib_debugfs_init(void) | |
4793 | { | |
4794 | /* /sys/kernel/debug/gpio */ | |
4795 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
4796 | NULL, NULL, &gpiolib_operations); | |
4797 | return 0; | |
4798 | } | |
4799 | subsys_initcall(gpiolib_debugfs_init); | |
4800 | ||
4801 | #endif /* DEBUG_FS */ |