Commit | Line | Data |
---|---|---|
923a654c | 1 | #include <linux/bitmap.h> |
d2876d08 DB |
2 | #include <linux/kernel.h> |
3 | #include <linux/module.h> | |
ff77c352 | 4 | #include <linux/interrupt.h> |
d2876d08 DB |
5 | #include <linux/irq.h> |
6 | #include <linux/spinlock.h> | |
1a989d0f | 7 | #include <linux/list.h> |
d8f388d8 DB |
8 | #include <linux/device.h> |
9 | #include <linux/err.h> | |
10 | #include <linux/debugfs.h> | |
11 | #include <linux/seq_file.h> | |
12 | #include <linux/gpio.h> | |
391c970c | 13 | #include <linux/of_gpio.h> |
ff77c352 | 14 | #include <linux/idr.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
7b199811 | 16 | #include <linux/acpi.h> |
53e7cac3 | 17 | #include <linux/gpio/driver.h> |
0a6d3158 | 18 | #include <linux/gpio/machine.h> |
c771c2f4 | 19 | #include <linux/pinctrl/consumer.h> |
3c702e99 LW |
20 | #include <linux/cdev.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/uaccess.h> | |
8b92e17e | 23 | #include <linux/compat.h> |
d7c51b47 | 24 | #include <linux/anon_inodes.h> |
953b956a | 25 | #include <linux/file.h> |
61f922db LW |
26 | #include <linux/kfifo.h> |
27 | #include <linux/poll.h> | |
28 | #include <linux/timekeeping.h> | |
3c702e99 | 29 | #include <uapi/linux/gpio.h> |
d2876d08 | 30 | |
664e3e5a MW |
31 | #include "gpiolib.h" |
32 | ||
3f397c21 UKK |
33 | #define CREATE_TRACE_POINTS |
34 | #include <trace/events/gpio.h> | |
d2876d08 | 35 | |
79a9becd | 36 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 37 | * |
79a9becd AC |
38 | * The GPIO programming interface allows for inlining speed-critical |
39 | * get/set operations for common cases, so that access to SOC-integrated | |
40 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
41 | */ |
42 | ||
43 | ||
44 | /* When debugging, extend minimal trust to callers and platform code. | |
45 | * Also emit diagnostic messages that may help initial bringup, when | |
46 | * board setup or driver bugs are most common. | |
47 | * | |
48 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
49 | */ | |
50 | #ifdef DEBUG | |
51 | #define extra_checks 1 | |
52 | #else | |
53 | #define extra_checks 0 | |
54 | #endif | |
55 | ||
ff2b1359 LW |
56 | /* Device and char device-related information */ |
57 | static DEFINE_IDA(gpio_ida); | |
3c702e99 LW |
58 | static dev_t gpio_devt; |
59 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ | |
60 | static struct bus_type gpio_bus_type = { | |
61 | .name = "gpio", | |
62 | }; | |
ff2b1359 | 63 | |
3027743f LA |
64 | /* |
65 | * Number of GPIOs to use for the fast path in set array | |
66 | */ | |
67 | #define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT | |
68 | ||
d2876d08 DB |
69 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
70 | * While any GPIO is requested, its gpio_chip is not removable; | |
71 | * each GPIO's "requested" flag serves as a lock and refcount. | |
72 | */ | |
0eb4c6c2 | 73 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 74 | |
bae48da2 AC |
75 | static DEFINE_MUTEX(gpio_lookup_lock); |
76 | static LIST_HEAD(gpio_lookup_list); | |
ff2b1359 | 77 | LIST_HEAD(gpio_devices); |
6d86750c | 78 | |
a411e81e BG |
79 | static DEFINE_MUTEX(gpio_machine_hogs_mutex); |
80 | static LIST_HEAD(gpio_machine_hogs); | |
81 | ||
6d86750c | 82 | static void gpiochip_free_hogs(struct gpio_chip *chip); |
959bc7b2 | 83 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
84 | struct lock_class_key *lock_key, |
85 | struct lock_class_key *request_key); | |
6d86750c | 86 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); |
79b804cb MW |
87 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); |
88 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); | |
6d86750c | 89 | |
159f3cd9 | 90 | static bool gpiolib_initialized; |
6d86750c | 91 | |
d2876d08 DB |
92 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
93 | { | |
d2876d08 | 94 | d->label = label; |
d2876d08 DB |
95 | } |
96 | ||
372e722e | 97 | /** |
950d55f5 TR |
98 | * gpio_to_desc - Convert a GPIO number to its descriptor |
99 | * @gpio: global GPIO number | |
100 | * | |
101 | * Returns: | |
102 | * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO | |
103 | * with the given number exists in the system. | |
372e722e | 104 | */ |
79a9becd | 105 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 106 | { |
ff2b1359 | 107 | struct gpio_device *gdev; |
14e85c0e AC |
108 | unsigned long flags; |
109 | ||
110 | spin_lock_irqsave(&gpio_lock, flags); | |
111 | ||
ff2b1359 | 112 | list_for_each_entry(gdev, &gpio_devices, list) { |
fdeb8e15 LW |
113 | if (gdev->base <= gpio && |
114 | gdev->base + gdev->ngpio > gpio) { | |
14e85c0e | 115 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 116 | return &gdev->descs[gpio - gdev->base]; |
14e85c0e AC |
117 | } |
118 | } | |
119 | ||
120 | spin_unlock_irqrestore(&gpio_lock, flags); | |
121 | ||
0e9a5edf AC |
122 | if (!gpio_is_valid(gpio)) |
123 | WARN(1, "invalid GPIO %d\n", gpio); | |
124 | ||
14e85c0e | 125 | return NULL; |
372e722e | 126 | } |
79a9becd | 127 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 128 | |
d468bf9e | 129 | /** |
950d55f5 TR |
130 | * gpiochip_get_desc - get the GPIO descriptor corresponding to the given |
131 | * hardware number for this chip | |
132 | * @chip: GPIO chip | |
133 | * @hwnum: hardware number of the GPIO for this chip | |
134 | * | |
135 | * Returns: | |
136 | * A pointer to the GPIO descriptor or %ERR_PTR(-EINVAL) if no GPIO exists | |
137 | * in the given chip for the specified hardware number. | |
d468bf9e | 138 | */ |
bb1e88cc AC |
139 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
140 | u16 hwnum) | |
d468bf9e | 141 | { |
fdeb8e15 LW |
142 | struct gpio_device *gdev = chip->gpiodev; |
143 | ||
144 | if (hwnum >= gdev->ngpio) | |
b7d0a28a | 145 | return ERR_PTR(-EINVAL); |
d468bf9e | 146 | |
fdeb8e15 | 147 | return &gdev->descs[hwnum]; |
d468bf9e | 148 | } |
372e722e AC |
149 | |
150 | /** | |
950d55f5 TR |
151 | * desc_to_gpio - convert a GPIO descriptor to the integer namespace |
152 | * @desc: GPIO descriptor | |
153 | * | |
372e722e | 154 | * This should disappear in the future but is needed since we still |
950d55f5 TR |
155 | * use GPIO numbers for error messages and sysfs nodes. |
156 | * | |
157 | * Returns: | |
158 | * The global GPIO number for the GPIO specified by its descriptor. | |
372e722e | 159 | */ |
79a9becd | 160 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 161 | { |
fdeb8e15 | 162 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
372e722e | 163 | } |
79a9becd | 164 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
165 | |
166 | ||
79a9becd AC |
167 | /** |
168 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
169 | * @desc: descriptor to return the chip of | |
170 | */ | |
171 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 172 | { |
dd3b9a44 | 173 | if (!desc || !desc->gdev) |
fdeb8e15 LW |
174 | return NULL; |
175 | return desc->gdev->chip; | |
372e722e | 176 | } |
79a9becd | 177 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 178 | |
8d0aab2f AV |
179 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
180 | static int gpiochip_find_base(int ngpio) | |
181 | { | |
ff2b1359 | 182 | struct gpio_device *gdev; |
83cabe33 | 183 | int base = ARCH_NR_GPIOS - ngpio; |
8d0aab2f | 184 | |
ff2b1359 | 185 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
83cabe33 | 186 | /* found a free space? */ |
fdeb8e15 | 187 | if (gdev->base + gdev->ngpio <= base) |
83cabe33 AC |
188 | break; |
189 | else | |
190 | /* nope, check the space right before the chip */ | |
fdeb8e15 | 191 | base = gdev->base - ngpio; |
8d0aab2f AV |
192 | } |
193 | ||
83cabe33 | 194 | if (gpio_is_valid(base)) { |
8d0aab2f | 195 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
196 | return base; |
197 | } else { | |
198 | pr_err("%s: cannot find free range\n", __func__); | |
199 | return -ENOSPC; | |
169b6a7a | 200 | } |
169b6a7a AV |
201 | } |
202 | ||
79a9becd AC |
203 | /** |
204 | * gpiod_get_direction - return the current direction of a GPIO | |
205 | * @desc: GPIO to get the direction of | |
206 | * | |
94fc7309 | 207 | * Returns 0 for output, 1 for input, or an error code in case of error. |
79a9becd AC |
208 | * |
209 | * This function may sleep if gpiod_cansleep() is true. | |
210 | */ | |
8e53b0f1 | 211 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 | 212 | { |
d0121b85 WS |
213 | struct gpio_chip *chip; |
214 | unsigned offset; | |
215 | int status; | |
80b0a602 | 216 | |
372e722e AC |
217 | chip = gpiod_to_chip(desc); |
218 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
219 | |
220 | if (!chip->get_direction) | |
d0121b85 | 221 | return -ENOTSUPP; |
80b0a602 | 222 | |
372e722e | 223 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
224 | if (status > 0) { |
225 | /* GPIOF_DIR_IN, or other positive */ | |
226 | status = 1; | |
8e53b0f1 | 227 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
228 | } |
229 | if (status == 0) { | |
230 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 231 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
232 | } |
233 | return status; | |
234 | } | |
79a9becd | 235 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 236 | |
1a989d0f AC |
237 | /* |
238 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
ef7c7553 | 239 | * by range(means [base, base + ngpio - 1]) order. |
1a989d0f AC |
240 | * |
241 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
242 | * space. | |
243 | */ | |
ff2b1359 | 244 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
1a989d0f | 245 | { |
a961f9b4 | 246 | struct gpio_device *prev, *next; |
1a989d0f | 247 | |
ff2b1359 | 248 | if (list_empty(&gpio_devices)) { |
a961f9b4 | 249 | /* initial entry in list */ |
ff2b1359 | 250 | list_add_tail(&gdev->list, &gpio_devices); |
e28ecca6 | 251 | return 0; |
1a989d0f AC |
252 | } |
253 | ||
a961f9b4 BJZ |
254 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
255 | if (gdev->base + gdev->ngpio <= next->base) { | |
256 | /* add before first entry */ | |
257 | list_add(&gdev->list, &gpio_devices); | |
258 | return 0; | |
1a989d0f AC |
259 | } |
260 | ||
a961f9b4 BJZ |
261 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
262 | if (prev->base + prev->ngpio <= gdev->base) { | |
263 | /* add behind last entry */ | |
264 | list_add_tail(&gdev->list, &gpio_devices); | |
96098df1 | 265 | return 0; |
1a989d0f AC |
266 | } |
267 | ||
a961f9b4 BJZ |
268 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
269 | /* at the end of the list */ | |
270 | if (&next->list == &gpio_devices) | |
271 | break; | |
1a989d0f | 272 | |
a961f9b4 BJZ |
273 | /* add between prev and next */ |
274 | if (prev->base + prev->ngpio <= gdev->base | |
275 | && gdev->base + gdev->ngpio <= next->base) { | |
276 | list_add(&gdev->list, &prev->list); | |
277 | return 0; | |
278 | } | |
279 | } | |
280 | ||
281 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); | |
282 | return -EBUSY; | |
1a989d0f AC |
283 | } |
284 | ||
950d55f5 | 285 | /* |
f881bab0 LW |
286 | * Convert a GPIO name to its descriptor |
287 | */ | |
288 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
289 | { | |
ff2b1359 | 290 | struct gpio_device *gdev; |
f881bab0 LW |
291 | unsigned long flags; |
292 | ||
293 | spin_lock_irqsave(&gpio_lock, flags); | |
294 | ||
ff2b1359 | 295 | list_for_each_entry(gdev, &gpio_devices, list) { |
f881bab0 LW |
296 | int i; |
297 | ||
fdeb8e15 LW |
298 | for (i = 0; i != gdev->ngpio; ++i) { |
299 | struct gpio_desc *desc = &gdev->descs[i]; | |
f881bab0 | 300 | |
fdeb8e15 | 301 | if (!desc->name || !name) |
f881bab0 LW |
302 | continue; |
303 | ||
fdeb8e15 | 304 | if (!strcmp(desc->name, name)) { |
f881bab0 | 305 | spin_unlock_irqrestore(&gpio_lock, flags); |
fdeb8e15 | 306 | return desc; |
f881bab0 LW |
307 | } |
308 | } | |
309 | } | |
310 | ||
311 | spin_unlock_irqrestore(&gpio_lock, flags); | |
312 | ||
313 | return NULL; | |
314 | } | |
315 | ||
5f3ca732 MP |
316 | /* |
317 | * Takes the names from gc->names and checks if they are all unique. If they | |
318 | * are, they are assigned to their gpio descriptors. | |
319 | * | |
ed37915c | 320 | * Warning if one of the names is already used for a different GPIO. |
5f3ca732 MP |
321 | */ |
322 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
323 | { | |
fdeb8e15 | 324 | struct gpio_device *gdev = gc->gpiodev; |
5f3ca732 MP |
325 | int i; |
326 | ||
327 | if (!gc->names) | |
328 | return 0; | |
329 | ||
330 | /* First check all names if they are unique */ | |
331 | for (i = 0; i != gc->ngpio; ++i) { | |
332 | struct gpio_desc *gpio; | |
333 | ||
334 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 335 | if (gpio) |
fdeb8e15 | 336 | dev_warn(&gdev->dev, |
34ffd85d | 337 | "Detected name collision for GPIO name '%s'\n", |
f881bab0 | 338 | gc->names[i]); |
5f3ca732 MP |
339 | } |
340 | ||
341 | /* Then add all names to the GPIO descriptors */ | |
342 | for (i = 0; i != gc->ngpio; ++i) | |
fdeb8e15 | 343 | gdev->descs[i].name = gc->names[i]; |
5f3ca732 MP |
344 | |
345 | return 0; | |
346 | } | |
347 | ||
e4371f6e SB |
348 | static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip) |
349 | { | |
350 | unsigned long *p; | |
351 | ||
ace56935 | 352 | p = kmalloc_array(BITS_TO_LONGS(chip->ngpio), sizeof(*p), GFP_KERNEL); |
e4371f6e SB |
353 | if (!p) |
354 | return NULL; | |
355 | ||
356 | /* Assume by default all GPIOs are valid */ | |
357 | bitmap_fill(p, chip->ngpio); | |
358 | ||
359 | return p; | |
360 | } | |
361 | ||
726cb3ba SB |
362 | static int gpiochip_init_valid_mask(struct gpio_chip *gpiochip) |
363 | { | |
364 | #ifdef CONFIG_OF_GPIO | |
365 | int size; | |
366 | struct device_node *np = gpiochip->of_node; | |
367 | ||
368 | size = of_property_count_u32_elems(np, "gpio-reserved-ranges"); | |
369 | if (size > 0 && size % 2 == 0) | |
370 | gpiochip->need_valid_mask = true; | |
371 | #endif | |
372 | ||
373 | if (!gpiochip->need_valid_mask) | |
374 | return 0; | |
375 | ||
376 | gpiochip->valid_mask = gpiochip_allocate_mask(gpiochip); | |
377 | if (!gpiochip->valid_mask) | |
378 | return -ENOMEM; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static void gpiochip_free_valid_mask(struct gpio_chip *gpiochip) | |
384 | { | |
385 | kfree(gpiochip->valid_mask); | |
386 | gpiochip->valid_mask = NULL; | |
387 | } | |
388 | ||
389 | bool gpiochip_line_is_valid(const struct gpio_chip *gpiochip, | |
390 | unsigned int offset) | |
391 | { | |
392 | /* No mask means all valid */ | |
393 | if (likely(!gpiochip->valid_mask)) | |
394 | return true; | |
395 | return test_bit(offset, gpiochip->valid_mask); | |
396 | } | |
397 | EXPORT_SYMBOL_GPL(gpiochip_line_is_valid); | |
398 | ||
d7c51b47 LW |
399 | /* |
400 | * GPIO line handle management | |
401 | */ | |
402 | ||
403 | /** | |
404 | * struct linehandle_state - contains the state of a userspace handle | |
405 | * @gdev: the GPIO device the handle pertains to | |
406 | * @label: consumer label used to tag descriptors | |
407 | * @descs: the GPIO descriptors held by this handle | |
408 | * @numdescs: the number of descriptors held in the descs array | |
409 | */ | |
410 | struct linehandle_state { | |
411 | struct gpio_device *gdev; | |
412 | const char *label; | |
413 | struct gpio_desc *descs[GPIOHANDLES_MAX]; | |
414 | u32 numdescs; | |
415 | }; | |
416 | ||
e3e847c7 LPC |
417 | #define GPIOHANDLE_REQUEST_VALID_FLAGS \ |
418 | (GPIOHANDLE_REQUEST_INPUT | \ | |
419 | GPIOHANDLE_REQUEST_OUTPUT | \ | |
420 | GPIOHANDLE_REQUEST_ACTIVE_LOW | \ | |
421 | GPIOHANDLE_REQUEST_OPEN_DRAIN | \ | |
422 | GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
423 | ||
d7c51b47 LW |
424 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, |
425 | unsigned long arg) | |
426 | { | |
427 | struct linehandle_state *lh = filep->private_data; | |
428 | void __user *ip = (void __user *)arg; | |
429 | struct gpiohandle_data ghd; | |
b9762beb | 430 | DECLARE_BITMAP(vals, GPIOHANDLES_MAX); |
d7c51b47 LW |
431 | int i; |
432 | ||
433 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
2b955b34 | 434 | /* NOTE: It's ok to read values of output lines. */ |
eec1d566 LW |
435 | int ret = gpiod_get_array_value_complex(false, |
436 | true, | |
437 | lh->numdescs, | |
438 | lh->descs, | |
77588c14 | 439 | NULL, |
eec1d566 LW |
440 | vals); |
441 | if (ret) | |
442 | return ret; | |
d7c51b47 | 443 | |
3eded5d8 | 444 | memset(&ghd, 0, sizeof(ghd)); |
eec1d566 | 445 | for (i = 0; i < lh->numdescs; i++) |
b9762beb | 446 | ghd.values[i] = test_bit(i, vals); |
d7c51b47 LW |
447 | |
448 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
449 | return -EFAULT; | |
450 | ||
451 | return 0; | |
452 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { | |
e5332d54 BG |
453 | /* |
454 | * All line descriptors were created at once with the same | |
455 | * flags so just check if the first one is really output. | |
456 | */ | |
457 | if (!test_bit(FLAG_IS_OUT, &lh->descs[0]->flags)) | |
458 | return -EPERM; | |
459 | ||
d7c51b47 LW |
460 | if (copy_from_user(&ghd, ip, sizeof(ghd))) |
461 | return -EFAULT; | |
462 | ||
463 | /* Clamp all values to [0,1] */ | |
464 | for (i = 0; i < lh->numdescs; i++) | |
b9762beb | 465 | __assign_bit(i, vals, ghd.values[i]); |
d7c51b47 LW |
466 | |
467 | /* Reuse the array setting function */ | |
3027743f | 468 | return gpiod_set_array_value_complex(false, |
d7c51b47 LW |
469 | true, |
470 | lh->numdescs, | |
471 | lh->descs, | |
77588c14 | 472 | NULL, |
d7c51b47 | 473 | vals); |
d7c51b47 LW |
474 | } |
475 | return -EINVAL; | |
476 | } | |
477 | ||
478 | #ifdef CONFIG_COMPAT | |
479 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, | |
480 | unsigned long arg) | |
481 | { | |
482 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
483 | } | |
484 | #endif | |
485 | ||
486 | static int linehandle_release(struct inode *inode, struct file *filep) | |
487 | { | |
488 | struct linehandle_state *lh = filep->private_data; | |
489 | struct gpio_device *gdev = lh->gdev; | |
490 | int i; | |
491 | ||
492 | for (i = 0; i < lh->numdescs; i++) | |
493 | gpiod_free(lh->descs[i]); | |
494 | kfree(lh->label); | |
495 | kfree(lh); | |
496 | put_device(&gdev->dev); | |
497 | return 0; | |
498 | } | |
499 | ||
500 | static const struct file_operations linehandle_fileops = { | |
501 | .release = linehandle_release, | |
502 | .owner = THIS_MODULE, | |
503 | .llseek = noop_llseek, | |
504 | .unlocked_ioctl = linehandle_ioctl, | |
505 | #ifdef CONFIG_COMPAT | |
506 | .compat_ioctl = linehandle_ioctl_compat, | |
507 | #endif | |
508 | }; | |
509 | ||
510 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) | |
511 | { | |
512 | struct gpiohandle_request handlereq; | |
513 | struct linehandle_state *lh; | |
953b956a | 514 | struct file *file; |
ab3dbcf7 | 515 | int fd, i, count = 0, ret; |
418ee8e9 | 516 | u32 lflags; |
d7c51b47 LW |
517 | |
518 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) | |
519 | return -EFAULT; | |
520 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) | |
521 | return -EINVAL; | |
522 | ||
418ee8e9 BG |
523 | lflags = handlereq.flags; |
524 | ||
525 | /* Return an error if an unknown flag is set */ | |
526 | if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) | |
527 | return -EINVAL; | |
528 | ||
588fc3bc BG |
529 | /* |
530 | * Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If | |
531 | * the hardware actually supports enabling both at the same time the | |
532 | * electrical result would be disastrous. | |
533 | */ | |
534 | if ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) && | |
535 | (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE)) | |
536 | return -EINVAL; | |
537 | ||
609aaf6a BG |
538 | /* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */ |
539 | if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) && | |
540 | ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) || | |
541 | (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))) | |
542 | return -EINVAL; | |
543 | ||
d7c51b47 LW |
544 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); |
545 | if (!lh) | |
546 | return -ENOMEM; | |
547 | lh->gdev = gdev; | |
548 | get_device(&gdev->dev); | |
549 | ||
550 | /* Make sure this is terminated */ | |
551 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; | |
552 | if (strlen(handlereq.consumer_label)) { | |
553 | lh->label = kstrdup(handlereq.consumer_label, | |
554 | GFP_KERNEL); | |
555 | if (!lh->label) { | |
556 | ret = -ENOMEM; | |
557 | goto out_free_lh; | |
558 | } | |
559 | } | |
560 | ||
561 | /* Request each GPIO */ | |
562 | for (i = 0; i < handlereq.lines; i++) { | |
563 | u32 offset = handlereq.lineoffsets[i]; | |
d7c51b47 LW |
564 | struct gpio_desc *desc; |
565 | ||
e405f9fc LPC |
566 | if (offset >= gdev->ngpio) { |
567 | ret = -EINVAL; | |
568 | goto out_free_descs; | |
569 | } | |
570 | ||
d7c51b47 LW |
571 | desc = &gdev->descs[offset]; |
572 | ret = gpiod_request(desc, lh->label); | |
573 | if (ret) | |
574 | goto out_free_descs; | |
575 | lh->descs[i] = desc; | |
ab3dbcf7 | 576 | count = i; |
d7c51b47 LW |
577 | |
578 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
579 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
580 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
581 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
582 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
583 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
584 | ||
e10f72bf AJ |
585 | ret = gpiod_set_transitory(desc, false); |
586 | if (ret < 0) | |
587 | goto out_free_descs; | |
588 | ||
d7c51b47 LW |
589 | /* |
590 | * Lines have to be requested explicitly for input | |
591 | * or output, else the line will be treated "as is". | |
592 | */ | |
593 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
594 | int val = !!handlereq.default_values[i]; | |
595 | ||
596 | ret = gpiod_direction_output(desc, val); | |
597 | if (ret) | |
598 | goto out_free_descs; | |
599 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { | |
600 | ret = gpiod_direction_input(desc); | |
601 | if (ret) | |
602 | goto out_free_descs; | |
603 | } | |
604 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", | |
605 | offset); | |
606 | } | |
e2f608be LW |
607 | /* Let i point at the last handle */ |
608 | i--; | |
d7c51b47 LW |
609 | lh->numdescs = handlereq.lines; |
610 | ||
953b956a | 611 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
d7c51b47 LW |
612 | if (fd < 0) { |
613 | ret = fd; | |
614 | goto out_free_descs; | |
615 | } | |
616 | ||
953b956a LPC |
617 | file = anon_inode_getfile("gpio-linehandle", |
618 | &linehandle_fileops, | |
619 | lh, | |
620 | O_RDONLY | O_CLOEXEC); | |
621 | if (IS_ERR(file)) { | |
622 | ret = PTR_ERR(file); | |
623 | goto out_put_unused_fd; | |
624 | } | |
625 | ||
d7c51b47 | 626 | handlereq.fd = fd; |
d932cd49 | 627 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
953b956a LPC |
628 | /* |
629 | * fput() will trigger the release() callback, so do not go onto | |
630 | * the regular error cleanup path here. | |
631 | */ | |
632 | fput(file); | |
633 | put_unused_fd(fd); | |
634 | return -EFAULT; | |
d932cd49 | 635 | } |
d7c51b47 | 636 | |
953b956a LPC |
637 | fd_install(fd, file); |
638 | ||
d7c51b47 LW |
639 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", |
640 | lh->numdescs); | |
641 | ||
642 | return 0; | |
643 | ||
953b956a LPC |
644 | out_put_unused_fd: |
645 | put_unused_fd(fd); | |
d7c51b47 | 646 | out_free_descs: |
ab3dbcf7 | 647 | for (i = 0; i < count; i++) |
d7c51b47 LW |
648 | gpiod_free(lh->descs[i]); |
649 | kfree(lh->label); | |
650 | out_free_lh: | |
651 | kfree(lh); | |
652 | put_device(&gdev->dev); | |
653 | return ret; | |
654 | } | |
655 | ||
61f922db LW |
656 | /* |
657 | * GPIO line event management | |
658 | */ | |
659 | ||
660 | /** | |
661 | * struct lineevent_state - contains the state of a userspace event | |
662 | * @gdev: the GPIO device the event pertains to | |
663 | * @label: consumer label used to tag descriptors | |
664 | * @desc: the GPIO descriptor held by this event | |
665 | * @eflags: the event flags this line was requested with | |
666 | * @irq: the interrupt that trigger in response to events on this GPIO | |
667 | * @wait: wait queue that handles blocking reads of events | |
668 | * @events: KFIFO for the GPIO events | |
669 | * @read_lock: mutex lock to protect reads from colliding with adding | |
670 | * new events to the FIFO | |
d58f2bf2 LW |
671 | * @timestamp: cache for the timestamp storing it between hardirq |
672 | * and IRQ thread, used to bring the timestamp close to the actual | |
673 | * event | |
61f922db LW |
674 | */ |
675 | struct lineevent_state { | |
676 | struct gpio_device *gdev; | |
677 | const char *label; | |
678 | struct gpio_desc *desc; | |
679 | u32 eflags; | |
680 | int irq; | |
681 | wait_queue_head_t wait; | |
682 | DECLARE_KFIFO(events, struct gpioevent_data, 16); | |
683 | struct mutex read_lock; | |
d58f2bf2 | 684 | u64 timestamp; |
61f922db LW |
685 | }; |
686 | ||
ac7dbb99 LPC |
687 | #define GPIOEVENT_REQUEST_VALID_FLAGS \ |
688 | (GPIOEVENT_REQUEST_RISING_EDGE | \ | |
689 | GPIOEVENT_REQUEST_FALLING_EDGE) | |
690 | ||
afc9a42b | 691 | static __poll_t lineevent_poll(struct file *filep, |
61f922db LW |
692 | struct poll_table_struct *wait) |
693 | { | |
694 | struct lineevent_state *le = filep->private_data; | |
afc9a42b | 695 | __poll_t events = 0; |
61f922db LW |
696 | |
697 | poll_wait(filep, &le->wait, wait); | |
698 | ||
699 | if (!kfifo_is_empty(&le->events)) | |
a9a08845 | 700 | events = EPOLLIN | EPOLLRDNORM; |
61f922db LW |
701 | |
702 | return events; | |
703 | } | |
704 | ||
705 | ||
706 | static ssize_t lineevent_read(struct file *filep, | |
707 | char __user *buf, | |
708 | size_t count, | |
709 | loff_t *f_ps) | |
710 | { | |
711 | struct lineevent_state *le = filep->private_data; | |
712 | unsigned int copied; | |
713 | int ret; | |
714 | ||
715 | if (count < sizeof(struct gpioevent_data)) | |
716 | return -EINVAL; | |
717 | ||
718 | do { | |
719 | if (kfifo_is_empty(&le->events)) { | |
720 | if (filep->f_flags & O_NONBLOCK) | |
721 | return -EAGAIN; | |
722 | ||
723 | ret = wait_event_interruptible(le->wait, | |
724 | !kfifo_is_empty(&le->events)); | |
725 | if (ret) | |
726 | return ret; | |
727 | } | |
728 | ||
729 | if (mutex_lock_interruptible(&le->read_lock)) | |
730 | return -ERESTARTSYS; | |
731 | ret = kfifo_to_user(&le->events, buf, count, &copied); | |
732 | mutex_unlock(&le->read_lock); | |
733 | ||
734 | if (ret) | |
735 | return ret; | |
736 | ||
737 | /* | |
738 | * If we couldn't read anything from the fifo (a different | |
739 | * thread might have been faster) we either return -EAGAIN if | |
740 | * the file descriptor is non-blocking, otherwise we go back to | |
741 | * sleep and wait for more data to arrive. | |
742 | */ | |
743 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) | |
744 | return -EAGAIN; | |
745 | ||
746 | } while (copied == 0); | |
747 | ||
748 | return copied; | |
749 | } | |
750 | ||
751 | static int lineevent_release(struct inode *inode, struct file *filep) | |
752 | { | |
753 | struct lineevent_state *le = filep->private_data; | |
754 | struct gpio_device *gdev = le->gdev; | |
755 | ||
756 | free_irq(le->irq, le); | |
757 | gpiod_free(le->desc); | |
758 | kfree(le->label); | |
759 | kfree(le); | |
760 | put_device(&gdev->dev); | |
761 | return 0; | |
762 | } | |
763 | ||
764 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, | |
765 | unsigned long arg) | |
766 | { | |
767 | struct lineevent_state *le = filep->private_data; | |
768 | void __user *ip = (void __user *)arg; | |
769 | struct gpiohandle_data ghd; | |
770 | ||
771 | /* | |
772 | * We can get the value for an event line but not set it, | |
773 | * because it is input by definition. | |
774 | */ | |
775 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { | |
776 | int val; | |
777 | ||
d82aa4a8 LPC |
778 | memset(&ghd, 0, sizeof(ghd)); |
779 | ||
61f922db LW |
780 | val = gpiod_get_value_cansleep(le->desc); |
781 | if (val < 0) | |
782 | return val; | |
783 | ghd.values[0] = val; | |
784 | ||
785 | if (copy_to_user(ip, &ghd, sizeof(ghd))) | |
786 | return -EFAULT; | |
787 | ||
788 | return 0; | |
789 | } | |
790 | return -EINVAL; | |
791 | } | |
792 | ||
793 | #ifdef CONFIG_COMPAT | |
794 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, | |
795 | unsigned long arg) | |
796 | { | |
797 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); | |
798 | } | |
799 | #endif | |
800 | ||
801 | static const struct file_operations lineevent_fileops = { | |
802 | .release = lineevent_release, | |
803 | .read = lineevent_read, | |
804 | .poll = lineevent_poll, | |
805 | .owner = THIS_MODULE, | |
806 | .llseek = noop_llseek, | |
807 | .unlocked_ioctl = lineevent_ioctl, | |
808 | #ifdef CONFIG_COMPAT | |
809 | .compat_ioctl = lineevent_ioctl_compat, | |
810 | #endif | |
811 | }; | |
812 | ||
33265b17 | 813 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
61f922db LW |
814 | { |
815 | struct lineevent_state *le = p; | |
816 | struct gpioevent_data ge; | |
fa38869b | 817 | int ret; |
61f922db | 818 | |
24bd3efc LW |
819 | /* Do not leak kernel stack to userspace */ |
820 | memset(&ge, 0, sizeof(ge)); | |
821 | ||
d58f2bf2 | 822 | ge.timestamp = le->timestamp; |
61f922db | 823 | |
ad537b82 BG |
824 | if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE |
825 | && le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { | |
fa38869b | 826 | int level = gpiod_get_value_cansleep(le->desc); |
61f922db LW |
827 | if (level) |
828 | /* Emit low-to-high event */ | |
829 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
830 | else | |
831 | /* Emit high-to-low event */ | |
832 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
fa38869b | 833 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) { |
61f922db LW |
834 | /* Emit low-to-high event */ |
835 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; | |
fa38869b | 836 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { |
61f922db LW |
837 | /* Emit high-to-low event */ |
838 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; | |
bc0207a5 AB |
839 | } else { |
840 | return IRQ_NONE; | |
61f922db LW |
841 | } |
842 | ||
843 | ret = kfifo_put(&le->events, ge); | |
844 | if (ret != 0) | |
a9a08845 | 845 | wake_up_poll(&le->wait, EPOLLIN); |
61f922db LW |
846 | |
847 | return IRQ_HANDLED; | |
848 | } | |
849 | ||
d58f2bf2 LW |
850 | static irqreturn_t lineevent_irq_handler(int irq, void *p) |
851 | { | |
852 | struct lineevent_state *le = p; | |
853 | ||
854 | /* | |
855 | * Just store the timestamp in hardirq context so we get it as | |
856 | * close in time as possible to the actual event. | |
857 | */ | |
858 | le->timestamp = ktime_get_real_ns(); | |
859 | ||
860 | return IRQ_WAKE_THREAD; | |
861 | } | |
862 | ||
61f922db LW |
863 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) |
864 | { | |
865 | struct gpioevent_request eventreq; | |
866 | struct lineevent_state *le; | |
867 | struct gpio_desc *desc; | |
953b956a | 868 | struct file *file; |
61f922db LW |
869 | u32 offset; |
870 | u32 lflags; | |
871 | u32 eflags; | |
872 | int fd; | |
873 | int ret; | |
874 | int irqflags = 0; | |
875 | ||
876 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) | |
877 | return -EFAULT; | |
878 | ||
879 | le = kzalloc(sizeof(*le), GFP_KERNEL); | |
880 | if (!le) | |
881 | return -ENOMEM; | |
882 | le->gdev = gdev; | |
883 | get_device(&gdev->dev); | |
884 | ||
885 | /* Make sure this is terminated */ | |
886 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; | |
887 | if (strlen(eventreq.consumer_label)) { | |
888 | le->label = kstrdup(eventreq.consumer_label, | |
889 | GFP_KERNEL); | |
890 | if (!le->label) { | |
891 | ret = -ENOMEM; | |
892 | goto out_free_le; | |
893 | } | |
894 | } | |
895 | ||
896 | offset = eventreq.lineoffset; | |
897 | lflags = eventreq.handleflags; | |
898 | eflags = eventreq.eventflags; | |
899 | ||
b8b0e3d3 LPC |
900 | if (offset >= gdev->ngpio) { |
901 | ret = -EINVAL; | |
902 | goto out_free_label; | |
903 | } | |
904 | ||
ac7dbb99 LPC |
905 | /* Return an error if a unknown flag is set */ |
906 | if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || | |
907 | (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) { | |
908 | ret = -EINVAL; | |
909 | goto out_free_label; | |
910 | } | |
911 | ||
61f922db LW |
912 | /* This is just wrong: we don't look for events on output lines */ |
913 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { | |
914 | ret = -EINVAL; | |
915 | goto out_free_label; | |
916 | } | |
917 | ||
918 | desc = &gdev->descs[offset]; | |
919 | ret = gpiod_request(desc, le->label); | |
920 | if (ret) | |
f001cc35 | 921 | goto out_free_label; |
61f922db LW |
922 | le->desc = desc; |
923 | le->eflags = eflags; | |
924 | ||
925 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) | |
926 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
927 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) | |
928 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
929 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) | |
930 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
931 | ||
932 | ret = gpiod_direction_input(desc); | |
933 | if (ret) | |
934 | goto out_free_desc; | |
935 | ||
936 | le->irq = gpiod_to_irq(desc); | |
937 | if (le->irq <= 0) { | |
938 | ret = -ENODEV; | |
939 | goto out_free_desc; | |
940 | } | |
941 | ||
942 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) | |
943 | irqflags |= IRQF_TRIGGER_RISING; | |
944 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) | |
945 | irqflags |= IRQF_TRIGGER_FALLING; | |
946 | irqflags |= IRQF_ONESHOT; | |
61f922db LW |
947 | |
948 | INIT_KFIFO(le->events); | |
949 | init_waitqueue_head(&le->wait); | |
950 | mutex_init(&le->read_lock); | |
951 | ||
952 | /* Request a thread to read the events */ | |
953 | ret = request_threaded_irq(le->irq, | |
d58f2bf2 | 954 | lineevent_irq_handler, |
61f922db LW |
955 | lineevent_irq_thread, |
956 | irqflags, | |
957 | le->label, | |
958 | le); | |
959 | if (ret) | |
960 | goto out_free_desc; | |
961 | ||
953b956a | 962 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
61f922db LW |
963 | if (fd < 0) { |
964 | ret = fd; | |
965 | goto out_free_irq; | |
966 | } | |
967 | ||
953b956a LPC |
968 | file = anon_inode_getfile("gpio-event", |
969 | &lineevent_fileops, | |
970 | le, | |
971 | O_RDONLY | O_CLOEXEC); | |
972 | if (IS_ERR(file)) { | |
973 | ret = PTR_ERR(file); | |
974 | goto out_put_unused_fd; | |
975 | } | |
976 | ||
61f922db | 977 | eventreq.fd = fd; |
d932cd49 | 978 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
953b956a LPC |
979 | /* |
980 | * fput() will trigger the release() callback, so do not go onto | |
981 | * the regular error cleanup path here. | |
982 | */ | |
983 | fput(file); | |
984 | put_unused_fd(fd); | |
985 | return -EFAULT; | |
d932cd49 | 986 | } |
61f922db | 987 | |
953b956a LPC |
988 | fd_install(fd, file); |
989 | ||
61f922db LW |
990 | return 0; |
991 | ||
953b956a LPC |
992 | out_put_unused_fd: |
993 | put_unused_fd(fd); | |
61f922db LW |
994 | out_free_irq: |
995 | free_irq(le->irq, le); | |
996 | out_free_desc: | |
997 | gpiod_free(le->desc); | |
998 | out_free_label: | |
999 | kfree(le->label); | |
1000 | out_free_le: | |
1001 | kfree(le); | |
1002 | put_device(&gdev->dev); | |
1003 | return ret; | |
1004 | } | |
1005 | ||
950d55f5 | 1006 | /* |
3c702e99 LW |
1007 | * gpio_ioctl() - ioctl handler for the GPIO chardev |
1008 | */ | |
1009 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1010 | { | |
1011 | struct gpio_device *gdev = filp->private_data; | |
1012 | struct gpio_chip *chip = gdev->chip; | |
8b92e17e | 1013 | void __user *ip = (void __user *)arg; |
3c702e99 LW |
1014 | |
1015 | /* We fail any subsequent ioctl():s when the chip is gone */ | |
1016 | if (!chip) | |
1017 | return -ENODEV; | |
1018 | ||
521a2ad6 | 1019 | /* Fill in the struct and pass to userspace */ |
3c702e99 | 1020 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
521a2ad6 LW |
1021 | struct gpiochip_info chipinfo; |
1022 | ||
0f4bbb23 LPC |
1023 | memset(&chipinfo, 0, sizeof(chipinfo)); |
1024 | ||
3c702e99 LW |
1025 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
1026 | sizeof(chipinfo.name)); | |
1027 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; | |
df4878e9 LW |
1028 | strncpy(chipinfo.label, gdev->label, |
1029 | sizeof(chipinfo.label)); | |
1030 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
fdeb8e15 | 1031 | chipinfo.lines = gdev->ngpio; |
3c702e99 LW |
1032 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
1033 | return -EFAULT; | |
1034 | return 0; | |
521a2ad6 LW |
1035 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
1036 | struct gpioline_info lineinfo; | |
1037 | struct gpio_desc *desc; | |
1038 | ||
1039 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) | |
1040 | return -EFAULT; | |
1f1cc456 | 1041 | if (lineinfo.line_offset >= gdev->ngpio) |
521a2ad6 LW |
1042 | return -EINVAL; |
1043 | ||
1044 | desc = &gdev->descs[lineinfo.line_offset]; | |
1045 | if (desc->name) { | |
1046 | strncpy(lineinfo.name, desc->name, | |
1047 | sizeof(lineinfo.name)); | |
1048 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; | |
1049 | } else { | |
1050 | lineinfo.name[0] = '\0'; | |
1051 | } | |
1052 | if (desc->label) { | |
214338e3 LW |
1053 | strncpy(lineinfo.consumer, desc->label, |
1054 | sizeof(lineinfo.consumer)); | |
1055 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; | |
521a2ad6 | 1056 | } else { |
214338e3 | 1057 | lineinfo.consumer[0] = '\0'; |
521a2ad6 LW |
1058 | } |
1059 | ||
1060 | /* | |
1061 | * Userspace only need to know that the kernel is using | |
1062 | * this GPIO so it can't use it. | |
1063 | */ | |
1064 | lineinfo.flags = 0; | |
9d8cc89c LW |
1065 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
1066 | test_bit(FLAG_IS_HOGGED, &desc->flags) || | |
1067 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || | |
1068 | test_bit(FLAG_EXPORT, &desc->flags) || | |
1069 | test_bit(FLAG_SYSFS, &desc->flags)) | |
521a2ad6 | 1070 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
9d8cc89c | 1071 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
521a2ad6 | 1072 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
9d8cc89c | 1073 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
521a2ad6 | 1074 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
9d8cc89c | 1075 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
521a2ad6 | 1076 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
9d8cc89c | 1077 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
521a2ad6 LW |
1078 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
1079 | ||
1080 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) | |
1081 | return -EFAULT; | |
1082 | return 0; | |
d7c51b47 LW |
1083 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
1084 | return linehandle_create(gdev, ip); | |
61f922db LW |
1085 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
1086 | return lineevent_create(gdev, ip); | |
3c702e99 LW |
1087 | } |
1088 | return -EINVAL; | |
1089 | } | |
1090 | ||
8b92e17e LW |
1091 | #ifdef CONFIG_COMPAT |
1092 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, | |
1093 | unsigned long arg) | |
1094 | { | |
1095 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); | |
1096 | } | |
1097 | #endif | |
1098 | ||
3c702e99 LW |
1099 | /** |
1100 | * gpio_chrdev_open() - open the chardev for ioctl operations | |
1101 | * @inode: inode for this chardev | |
1102 | * @filp: file struct for storing private data | |
1103 | * Returns 0 on success | |
1104 | */ | |
1105 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) | |
1106 | { | |
1107 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1108 | struct gpio_device, chrdev); | |
1109 | ||
1110 | /* Fail on open if the backing gpiochip is gone */ | |
fb505747 | 1111 | if (!gdev->chip) |
3c702e99 LW |
1112 | return -ENODEV; |
1113 | get_device(&gdev->dev); | |
1114 | filp->private_data = gdev; | |
f4e81c52 LPC |
1115 | |
1116 | return nonseekable_open(inode, filp); | |
3c702e99 LW |
1117 | } |
1118 | ||
1119 | /** | |
1120 | * gpio_chrdev_release() - close chardev after ioctl operations | |
1121 | * @inode: inode for this chardev | |
1122 | * @filp: file struct for storing private data | |
1123 | * Returns 0 on success | |
1124 | */ | |
1125 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) | |
1126 | { | |
1127 | struct gpio_device *gdev = container_of(inode->i_cdev, | |
1128 | struct gpio_device, chrdev); | |
1129 | ||
3c702e99 LW |
1130 | put_device(&gdev->dev); |
1131 | return 0; | |
1132 | } | |
1133 | ||
1134 | ||
1135 | static const struct file_operations gpio_fileops = { | |
1136 | .release = gpio_chrdev_release, | |
1137 | .open = gpio_chrdev_open, | |
1138 | .owner = THIS_MODULE, | |
f4e81c52 | 1139 | .llseek = no_llseek, |
3c702e99 | 1140 | .unlocked_ioctl = gpio_ioctl, |
8b92e17e LW |
1141 | #ifdef CONFIG_COMPAT |
1142 | .compat_ioctl = gpio_ioctl_compat, | |
1143 | #endif | |
3c702e99 LW |
1144 | }; |
1145 | ||
ff2b1359 LW |
1146 | static void gpiodevice_release(struct device *dev) |
1147 | { | |
1148 | struct gpio_device *gdev = dev_get_drvdata(dev); | |
1149 | ||
1150 | list_del(&gdev->list); | |
1151 | ida_simple_remove(&gpio_ida, gdev->id); | |
fcf273e5 | 1152 | kfree_const(gdev->label); |
476e2fc5 | 1153 | kfree(gdev->descs); |
9efd9e69 | 1154 | kfree(gdev); |
ff2b1359 LW |
1155 | } |
1156 | ||
159f3cd9 GR |
1157 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
1158 | { | |
1159 | int status; | |
1160 | ||
1161 | cdev_init(&gdev->chrdev, &gpio_fileops); | |
1162 | gdev->chrdev.owner = THIS_MODULE; | |
159f3cd9 | 1163 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); |
111379dc LG |
1164 | |
1165 | status = cdev_device_add(&gdev->chrdev, &gdev->dev); | |
159f3cd9 | 1166 | if (status) |
111379dc LG |
1167 | return status; |
1168 | ||
1169 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", | |
1170 | MAJOR(gpio_devt), gdev->id); | |
159f3cd9 GR |
1171 | |
1172 | status = gpiochip_sysfs_register(gdev); | |
1173 | if (status) | |
1174 | goto err_remove_device; | |
1175 | ||
1176 | /* From this point, the .release() function cleans up gpio_device */ | |
1177 | gdev->dev.release = gpiodevice_release; | |
159f3cd9 GR |
1178 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
1179 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, | |
1180 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); | |
1181 | ||
1182 | return 0; | |
1183 | ||
1184 | err_remove_device: | |
111379dc | 1185 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
159f3cd9 GR |
1186 | return status; |
1187 | } | |
1188 | ||
a411e81e BG |
1189 | static void gpiochip_machine_hog(struct gpio_chip *chip, struct gpiod_hog *hog) |
1190 | { | |
1191 | struct gpio_desc *desc; | |
1192 | int rv; | |
1193 | ||
1194 | desc = gpiochip_get_desc(chip, hog->chip_hwnum); | |
1195 | if (IS_ERR(desc)) { | |
1196 | pr_err("%s: unable to get GPIO desc: %ld\n", | |
1197 | __func__, PTR_ERR(desc)); | |
1198 | return; | |
1199 | } | |
1200 | ||
ba3efdff | 1201 | if (test_bit(FLAG_IS_HOGGED, &desc->flags)) |
a411e81e BG |
1202 | return; |
1203 | ||
1204 | rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags); | |
1205 | if (rv) | |
1206 | pr_err("%s: unable to hog GPIO line (%s:%u): %d\n", | |
1207 | __func__, chip->label, hog->chip_hwnum, rv); | |
1208 | } | |
1209 | ||
1210 | static void machine_gpiochip_add(struct gpio_chip *chip) | |
1211 | { | |
1212 | struct gpiod_hog *hog; | |
1213 | ||
1214 | mutex_lock(&gpio_machine_hogs_mutex); | |
1215 | ||
1216 | list_for_each_entry(hog, &gpio_machine_hogs, list) { | |
1217 | if (!strcmp(chip->label, hog->chip_label)) | |
1218 | gpiochip_machine_hog(chip, hog); | |
1219 | } | |
1220 | ||
1221 | mutex_unlock(&gpio_machine_hogs_mutex); | |
1222 | } | |
1223 | ||
159f3cd9 GR |
1224 | static void gpiochip_setup_devs(void) |
1225 | { | |
1226 | struct gpio_device *gdev; | |
1227 | int err; | |
1228 | ||
1229 | list_for_each_entry(gdev, &gpio_devices, list) { | |
1230 | err = gpiochip_setup_dev(gdev); | |
1231 | if (err) | |
1232 | pr_err("%s: Failed to initialize gpio device (%d)\n", | |
1233 | dev_name(&gdev->dev), err); | |
1234 | } | |
1235 | } | |
1236 | ||
959bc7b2 | 1237 | int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, |
39c3fd58 AL |
1238 | struct lock_class_key *lock_key, |
1239 | struct lock_class_key *request_key) | |
d2876d08 DB |
1240 | { |
1241 | unsigned long flags; | |
1242 | int status = 0; | |
ff2b1359 | 1243 | unsigned i; |
8d0aab2f | 1244 | int base = chip->base; |
ff2b1359 | 1245 | struct gpio_device *gdev; |
d2876d08 | 1246 | |
ff2b1359 LW |
1247 | /* |
1248 | * First: allocate and populate the internal stat container, and | |
1249 | * set up the struct device. | |
1250 | */ | |
969f07b4 | 1251 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
ff2b1359 | 1252 | if (!gdev) |
14e85c0e | 1253 | return -ENOMEM; |
3c702e99 | 1254 | gdev->dev.bus = &gpio_bus_type; |
ff2b1359 LW |
1255 | gdev->chip = chip; |
1256 | chip->gpiodev = gdev; | |
1257 | if (chip->parent) { | |
1258 | gdev->dev.parent = chip->parent; | |
1259 | gdev->dev.of_node = chip->parent->of_node; | |
acc6e331 TR |
1260 | } |
1261 | ||
ff2b1359 LW |
1262 | #ifdef CONFIG_OF_GPIO |
1263 | /* If the gpiochip has an assigned OF node this takes precedence */ | |
acc6e331 TR |
1264 | if (chip->of_node) |
1265 | gdev->dev.of_node = chip->of_node; | |
6ff04974 BD |
1266 | else |
1267 | chip->of_node = gdev->dev.of_node; | |
ff2b1359 | 1268 | #endif |
acc6e331 | 1269 | |
ff2b1359 LW |
1270 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
1271 | if (gdev->id < 0) { | |
1272 | status = gdev->id; | |
1273 | goto err_free_gdev; | |
1274 | } | |
1275 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); | |
1276 | device_initialize(&gdev->dev); | |
1277 | dev_set_drvdata(&gdev->dev, gdev); | |
1278 | if (chip->parent && chip->parent->driver) | |
1279 | gdev->owner = chip->parent->driver->owner; | |
1280 | else if (chip->owner) | |
1281 | /* TODO: remove chip->owner */ | |
1282 | gdev->owner = chip->owner; | |
1283 | else | |
1284 | gdev->owner = THIS_MODULE; | |
d2876d08 | 1285 | |
476e2fc5 | 1286 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
1c3cdb18 | 1287 | if (!gdev->descs) { |
ff2b1359 LW |
1288 | status = -ENOMEM; |
1289 | goto err_free_gdev; | |
1290 | } | |
1291 | ||
5ed41cc4 BJZ |
1292 | if (chip->ngpio == 0) { |
1293 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); | |
ff2b1359 | 1294 | status = -EINVAL; |
159f3cd9 | 1295 | goto err_free_descs; |
5ed41cc4 | 1296 | } |
df4878e9 | 1297 | |
3027743f LA |
1298 | if (chip->ngpio > FASTPATH_NGPIO) |
1299 | chip_warn(chip, "line cnt %u is greater than fast path cnt %u\n", | |
1300 | chip->ngpio, FASTPATH_NGPIO); | |
1301 | ||
fcf273e5 | 1302 | gdev->label = kstrdup_const(chip->label ?: "unknown", GFP_KERNEL); |
df4878e9 LW |
1303 | if (!gdev->label) { |
1304 | status = -ENOMEM; | |
476e2fc5 | 1305 | goto err_free_descs; |
df4878e9 LW |
1306 | } |
1307 | ||
fdeb8e15 | 1308 | gdev->ngpio = chip->ngpio; |
43c54eca | 1309 | gdev->data = data; |
5ed41cc4 | 1310 | |
d2876d08 DB |
1311 | spin_lock_irqsave(&gpio_lock, flags); |
1312 | ||
fdeb8e15 LW |
1313 | /* |
1314 | * TODO: this allocates a Linux GPIO number base in the global | |
1315 | * GPIO numberspace for this chip. In the long run we want to | |
1316 | * get *rid* of this numberspace and use only descriptors, but | |
1317 | * it may be a pipe dream. It will not happen before we get rid | |
1318 | * of the sysfs interface anyways. | |
1319 | */ | |
8d0aab2f AV |
1320 | if (base < 0) { |
1321 | base = gpiochip_find_base(chip->ngpio); | |
1322 | if (base < 0) { | |
1323 | status = base; | |
225fce83 | 1324 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1325 | goto err_free_label; |
8d0aab2f | 1326 | } |
fdeb8e15 LW |
1327 | /* |
1328 | * TODO: it should not be necessary to reflect the assigned | |
1329 | * base outside of the GPIO subsystem. Go over drivers and | |
1330 | * see if anyone makes use of this, else drop this and assign | |
1331 | * a poison instead. | |
1332 | */ | |
8d0aab2f AV |
1333 | chip->base = base; |
1334 | } | |
fdeb8e15 | 1335 | gdev->base = base; |
8d0aab2f | 1336 | |
ff2b1359 | 1337 | status = gpiodev_add_to_list(gdev); |
05aa5203 JH |
1338 | if (status) { |
1339 | spin_unlock_irqrestore(&gpio_lock, flags); | |
476e2fc5 | 1340 | goto err_free_label; |
05aa5203 | 1341 | } |
1a989d0f | 1342 | |
545ebd9a LW |
1343 | spin_unlock_irqrestore(&gpio_lock, flags); |
1344 | ||
ff2b1359 | 1345 | for (i = 0; i < chip->ngpio; i++) { |
1c3cdb18 | 1346 | struct gpio_desc *desc = &gdev->descs[i]; |
05aa5203 | 1347 | |
fdeb8e15 | 1348 | desc->gdev = gdev; |
72d32000 | 1349 | |
1ca2a92b TT |
1350 | /* REVISIT: most hardware initializes GPIOs as inputs (often |
1351 | * with pullups enabled) so power usage is minimized. Linux | |
1352 | * code should set the gpio direction first thing; but until | |
1353 | * it does, and in case chip->get_direction is not set, we may | |
1354 | * expose the wrong direction in sysfs. | |
1355 | */ | |
1356 | desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0; | |
d2876d08 | 1357 | } |
14e85c0e | 1358 | |
f23f1516 | 1359 | #ifdef CONFIG_PINCTRL |
20ec3e39 | 1360 | INIT_LIST_HEAD(&gdev->pin_ranges); |
f23f1516 SH |
1361 | #endif |
1362 | ||
5f3ca732 MP |
1363 | status = gpiochip_set_desc_names(chip); |
1364 | if (status) | |
1365 | goto err_remove_from_list; | |
1366 | ||
79b804cb MW |
1367 | status = gpiochip_irqchip_init_valid_mask(chip); |
1368 | if (status) | |
1369 | goto err_remove_from_list; | |
1370 | ||
726cb3ba SB |
1371 | status = gpiochip_init_valid_mask(chip); |
1372 | if (status) | |
1373 | goto err_remove_irqchip_mask; | |
1374 | ||
39c3fd58 | 1375 | status = gpiochip_add_irqchip(chip, lock_key, request_key); |
e0d89728 TR |
1376 | if (status) |
1377 | goto err_remove_chip; | |
1378 | ||
28355f81 TV |
1379 | status = of_gpiochip_add(chip); |
1380 | if (status) | |
1381 | goto err_remove_chip; | |
1382 | ||
664e3e5a | 1383 | acpi_gpiochip_add(chip); |
391c970c | 1384 | |
a411e81e BG |
1385 | machine_gpiochip_add(chip); |
1386 | ||
3c702e99 LW |
1387 | /* |
1388 | * By first adding the chardev, and then adding the device, | |
1389 | * we get a device node entry in sysfs under | |
1390 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for | |
1391 | * coldplug of device nodes and other udev business. | |
159f3cd9 GR |
1392 | * We can do this only if gpiolib has been initialized. |
1393 | * Otherwise, defer until later. | |
3c702e99 | 1394 | */ |
159f3cd9 GR |
1395 | if (gpiolib_initialized) { |
1396 | status = gpiochip_setup_dev(gdev); | |
1397 | if (status) | |
1398 | goto err_remove_chip; | |
1399 | } | |
cedb1881 | 1400 | return 0; |
3bae4811 | 1401 | |
225fce83 JH |
1402 | err_remove_chip: |
1403 | acpi_gpiochip_remove(chip); | |
6d86750c | 1404 | gpiochip_free_hogs(chip); |
225fce83 | 1405 | of_gpiochip_remove(chip); |
726cb3ba SB |
1406 | gpiochip_free_valid_mask(chip); |
1407 | err_remove_irqchip_mask: | |
79b804cb | 1408 | gpiochip_irqchip_free_valid_mask(chip); |
5f3ca732 | 1409 | err_remove_from_list: |
225fce83 | 1410 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 1411 | list_del(&gdev->list); |
3bae4811 | 1412 | spin_unlock_irqrestore(&gpio_lock, flags); |
476e2fc5 | 1413 | err_free_label: |
fcf273e5 | 1414 | kfree_const(gdev->label); |
476e2fc5 GR |
1415 | err_free_descs: |
1416 | kfree(gdev->descs); | |
ff2b1359 LW |
1417 | err_free_gdev: |
1418 | ida_simple_remove(&gpio_ida, gdev->id); | |
d2876d08 | 1419 | /* failures here can mean systems won't boot... */ |
1777fc97 | 1420 | pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__, |
fdeb8e15 | 1421 | gdev->base, gdev->base + gdev->ngpio - 1, |
1777fc97 | 1422 | chip->label ? : "generic", status); |
fdeb8e15 | 1423 | kfree(gdev); |
d2876d08 DB |
1424 | return status; |
1425 | } | |
959bc7b2 | 1426 | EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key); |
d2876d08 | 1427 | |
43c54eca LW |
1428 | /** |
1429 | * gpiochip_get_data() - get per-subdriver data for the chip | |
950d55f5 TR |
1430 | * @chip: GPIO chip |
1431 | * | |
1432 | * Returns: | |
1433 | * The per-subdriver data for the chip. | |
43c54eca LW |
1434 | */ |
1435 | void *gpiochip_get_data(struct gpio_chip *chip) | |
1436 | { | |
1437 | return chip->gpiodev->data; | |
1438 | } | |
1439 | EXPORT_SYMBOL_GPL(gpiochip_get_data); | |
1440 | ||
d2876d08 DB |
1441 | /** |
1442 | * gpiochip_remove() - unregister a gpio_chip | |
1443 | * @chip: the chip to unregister | |
1444 | * | |
1445 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1446 | */ | |
e1db1706 | 1447 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 1448 | { |
ff2b1359 | 1449 | struct gpio_device *gdev = chip->gpiodev; |
fab28b89 | 1450 | struct gpio_desc *desc; |
d2876d08 | 1451 | unsigned long flags; |
1c3cdb18 | 1452 | unsigned i; |
fab28b89 | 1453 | bool requested = false; |
d2876d08 | 1454 | |
ff2b1359 | 1455 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
afbc4f31 | 1456 | gpiochip_sysfs_unregister(gdev); |
5018ada6 | 1457 | gpiochip_free_hogs(chip); |
bd203bd5 BJZ |
1458 | /* Numb the device, cancelling all outstanding operations */ |
1459 | gdev->chip = NULL; | |
00acc3dc | 1460 | gpiochip_irqchip_remove(chip); |
6072b9dc | 1461 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 1462 | gpiochip_remove_pin_ranges(chip); |
391c970c | 1463 | of_gpiochip_remove(chip); |
726cb3ba | 1464 | gpiochip_free_valid_mask(chip); |
43c54eca LW |
1465 | /* |
1466 | * We accept no more calls into the driver from this point, so | |
1467 | * NULL the driver data pointer | |
1468 | */ | |
1469 | gdev->data = NULL; | |
391c970c | 1470 | |
6798acaa | 1471 | spin_lock_irqsave(&gpio_lock, flags); |
fdeb8e15 | 1472 | for (i = 0; i < gdev->ngpio; i++) { |
1c3cdb18 | 1473 | desc = &gdev->descs[i]; |
fab28b89 JH |
1474 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
1475 | requested = true; | |
d2876d08 | 1476 | } |
d2876d08 | 1477 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 1478 | |
fab28b89 | 1479 | if (requested) |
fdeb8e15 | 1480 | dev_crit(&gdev->dev, |
58383c78 | 1481 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
fab28b89 | 1482 | |
ff2b1359 LW |
1483 | /* |
1484 | * The gpiochip side puts its use of the device to rest here: | |
1485 | * if there are no userspace clients, the chardev and device will | |
1486 | * be removed, else it will be dangling until the last user is | |
1487 | * gone. | |
1488 | */ | |
111379dc | 1489 | cdev_device_del(&gdev->chrdev, &gdev->dev); |
ff2b1359 | 1490 | put_device(&gdev->dev); |
d2876d08 DB |
1491 | } |
1492 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
1493 | ||
0cf3292c LD |
1494 | static void devm_gpio_chip_release(struct device *dev, void *res) |
1495 | { | |
1496 | struct gpio_chip *chip = *(struct gpio_chip **)res; | |
1497 | ||
1498 | gpiochip_remove(chip); | |
1499 | } | |
1500 | ||
1501 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) | |
1502 | ||
1503 | { | |
1504 | struct gpio_chip **r = res; | |
1505 | ||
1506 | if (!r || !*r) { | |
1507 | WARN_ON(!r || !*r); | |
1508 | return 0; | |
1509 | } | |
1510 | ||
1511 | return *r == data; | |
1512 | } | |
1513 | ||
1514 | /** | |
689fd02e | 1515 | * devm_gpiochip_add_data() - Resource manager gpiochip_add_data() |
0cf3292c LD |
1516 | * @dev: the device pointer on which irq_chip belongs to. |
1517 | * @chip: the chip to register, with chip->base initialized | |
950d55f5 | 1518 | * @data: driver-private data associated with this chip |
0cf3292c | 1519 | * |
950d55f5 | 1520 | * Context: potentially before irqs will work |
0cf3292c LD |
1521 | * |
1522 | * The gpio chip automatically be released when the device is unbound. | |
950d55f5 TR |
1523 | * |
1524 | * Returns: | |
1525 | * A negative errno if the chip can't be registered, such as because the | |
1526 | * chip->base is invalid or already associated with a different chip. | |
1527 | * Otherwise it returns zero as a success code. | |
0cf3292c LD |
1528 | */ |
1529 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, | |
1530 | void *data) | |
1531 | { | |
1532 | struct gpio_chip **ptr; | |
1533 | int ret; | |
1534 | ||
1535 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), | |
1536 | GFP_KERNEL); | |
1537 | if (!ptr) | |
1538 | return -ENOMEM; | |
1539 | ||
1540 | ret = gpiochip_add_data(chip, data); | |
1541 | if (ret < 0) { | |
1542 | devres_free(ptr); | |
1543 | return ret; | |
1544 | } | |
1545 | ||
1546 | *ptr = chip; | |
1547 | devres_add(dev, ptr); | |
1548 | ||
1549 | return 0; | |
1550 | } | |
1551 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); | |
1552 | ||
1553 | /** | |
1554 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() | |
1555 | * @dev: device for which which resource was allocated | |
1556 | * @chip: the chip to remove | |
1557 | * | |
1558 | * A gpio_chip with any GPIOs still requested may not be removed. | |
1559 | */ | |
1560 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) | |
1561 | { | |
1562 | int ret; | |
1563 | ||
1564 | ret = devres_release(dev, devm_gpio_chip_release, | |
1565 | devm_gpio_chip_match, chip); | |
3988d663 | 1566 | WARN_ON(ret); |
0cf3292c LD |
1567 | } |
1568 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); | |
1569 | ||
594fa265 GL |
1570 | /** |
1571 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
1572 | * @data: data to pass to match function | |
950d55f5 | 1573 | * @match: Callback function to check gpio_chip |
594fa265 GL |
1574 | * |
1575 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
1576 | * determined by a user supplied @match callback. The callback should return | |
1577 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
1578 | * non-zero, this function will return to the caller and not iterate over any | |
1579 | * more gpio_chips. | |
1580 | */ | |
07ce8ec7 | 1581 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 1582 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 1583 | void *data)) |
594fa265 | 1584 | { |
ff2b1359 | 1585 | struct gpio_device *gdev; |
acf06ff7 | 1586 | struct gpio_chip *chip = NULL; |
594fa265 | 1587 | unsigned long flags; |
594fa265 GL |
1588 | |
1589 | spin_lock_irqsave(&gpio_lock, flags); | |
ff2b1359 | 1590 | list_for_each_entry(gdev, &gpio_devices, list) |
acf06ff7 MY |
1591 | if (gdev->chip && match(gdev->chip, data)) { |
1592 | chip = gdev->chip; | |
594fa265 | 1593 | break; |
acf06ff7 | 1594 | } |
ff2b1359 | 1595 | |
594fa265 GL |
1596 | spin_unlock_irqrestore(&gpio_lock, flags); |
1597 | ||
1598 | return chip; | |
1599 | } | |
8fa0c9bf | 1600 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 1601 | |
79697ef9 AC |
1602 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
1603 | { | |
1604 | const char *name = data; | |
1605 | ||
1606 | return !strcmp(chip->label, name); | |
1607 | } | |
1608 | ||
1609 | static struct gpio_chip *find_chip_by_name(const char *name) | |
1610 | { | |
1611 | return gpiochip_find((void *)name, gpiochip_match_name); | |
1612 | } | |
1613 | ||
14250520 LW |
1614 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
1615 | ||
1616 | /* | |
1617 | * The following is irqchip helper code for gpiochips. | |
1618 | */ | |
1619 | ||
79b804cb MW |
1620 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
1621 | { | |
dc7b0387 | 1622 | if (!gpiochip->irq.need_valid_mask) |
79b804cb MW |
1623 | return 0; |
1624 | ||
e4371f6e | 1625 | gpiochip->irq.valid_mask = gpiochip_allocate_mask(gpiochip); |
dc7b0387 | 1626 | if (!gpiochip->irq.valid_mask) |
79b804cb MW |
1627 | return -ENOMEM; |
1628 | ||
79b804cb MW |
1629 | return 0; |
1630 | } | |
1631 | ||
1632 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
1633 | { | |
dc7b0387 TR |
1634 | kfree(gpiochip->irq.valid_mask); |
1635 | gpiochip->irq.valid_mask = NULL; | |
79b804cb MW |
1636 | } |
1637 | ||
64ff2c8e SB |
1638 | bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, |
1639 | unsigned int offset) | |
79b804cb | 1640 | { |
726cb3ba SB |
1641 | if (!gpiochip_line_is_valid(gpiochip, offset)) |
1642 | return false; | |
79b804cb | 1643 | /* No mask means all valid */ |
dc7b0387 | 1644 | if (likely(!gpiochip->irq.valid_mask)) |
79b804cb | 1645 | return true; |
dc7b0387 | 1646 | return test_bit(offset, gpiochip->irq.valid_mask); |
79b804cb | 1647 | } |
64ff2c8e | 1648 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid); |
79b804cb | 1649 | |
14250520 | 1650 | /** |
d245b3f9 | 1651 | * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip |
3f97d5fc LW |
1652 | * @gpiochip: the gpiochip to set the irqchip chain to |
1653 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
1654 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
1655 | * chained irqchip | |
1656 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
1657 | * coming out of the gpiochip. If the interrupt is nested rather than |
1658 | * cascaded, pass NULL in this handler argument | |
14250520 | 1659 | */ |
d245b3f9 LW |
1660 | static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, |
1661 | struct irq_chip *irqchip, | |
6f79309a | 1662 | unsigned int parent_irq, |
d245b3f9 | 1663 | irq_flow_handler_t parent_handler) |
14250520 | 1664 | { |
83141a77 LW |
1665 | unsigned int offset; |
1666 | ||
f0fbe7bc | 1667 | if (!gpiochip->irq.domain) { |
83141a77 LW |
1668 | chip_err(gpiochip, "called %s before setting up irqchip\n", |
1669 | __func__); | |
1c8732bb LW |
1670 | return; |
1671 | } | |
1672 | ||
3f97d5fc LW |
1673 | if (parent_handler) { |
1674 | if (gpiochip->can_sleep) { | |
1675 | chip_err(gpiochip, | |
b1911710 | 1676 | "you cannot have chained interrupts on a chip that may sleep\n"); |
3f97d5fc LW |
1677 | return; |
1678 | } | |
3f97d5fc LW |
1679 | /* |
1680 | * The parent irqchip is already using the chip_data for this | |
1681 | * irqchip, so our callbacks simply use the handler_data. | |
1682 | */ | |
f7f87753 TG |
1683 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
1684 | gpiochip); | |
25e4fe92 | 1685 | |
39e5f096 TR |
1686 | gpiochip->irq.parents = &parent_irq; |
1687 | gpiochip->irq.num_parents = 1; | |
3f97d5fc | 1688 | } |
83141a77 LW |
1689 | |
1690 | /* Set the parent IRQ for all affected IRQs */ | |
79b804cb MW |
1691 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1692 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1693 | continue; | |
f0fbe7bc | 1694 | irq_set_parent(irq_find_mapping(gpiochip->irq.domain, offset), |
83141a77 | 1695 | parent_irq); |
79b804cb | 1696 | } |
14250520 | 1697 | } |
d245b3f9 LW |
1698 | |
1699 | /** | |
1700 | * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip | |
1701 | * @gpiochip: the gpiochip to set the irqchip chain to | |
1702 | * @irqchip: the irqchip to chain to the gpiochip | |
1703 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1704 | * chained irqchip | |
1705 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
1706 | * coming out of the gpiochip. If the interrupt is nested rather than | |
1707 | * cascaded, pass NULL in this handler argument | |
1708 | */ | |
1709 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
1710 | struct irq_chip *irqchip, | |
6f79309a | 1711 | unsigned int parent_irq, |
d245b3f9 LW |
1712 | irq_flow_handler_t parent_handler) |
1713 | { | |
60ed54ca TR |
1714 | if (gpiochip->irq.threaded) { |
1715 | chip_err(gpiochip, "tried to chain a threaded gpiochip\n"); | |
1716 | return; | |
1717 | } | |
1718 | ||
d245b3f9 LW |
1719 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, |
1720 | parent_handler); | |
1721 | } | |
14250520 LW |
1722 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); |
1723 | ||
d245b3f9 LW |
1724 | /** |
1725 | * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip | |
1726 | * @gpiochip: the gpiochip to set the irqchip nested handler to | |
1727 | * @irqchip: the irqchip to nest to the gpiochip | |
1728 | * @parent_irq: the irq number corresponding to the parent IRQ for this | |
1729 | * nested irqchip | |
1730 | */ | |
1731 | void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, | |
1732 | struct irq_chip *irqchip, | |
6f79309a | 1733 | unsigned int parent_irq) |
d245b3f9 | 1734 | { |
d245b3f9 LW |
1735 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, |
1736 | NULL); | |
1737 | } | |
1738 | EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); | |
1739 | ||
14250520 LW |
1740 | /** |
1741 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
1742 | * @d: the irqdomain used by this irqchip | |
1743 | * @irq: the global irq number used by this GPIO irqchip irq | |
1744 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
1745 | * | |
1746 | * This function will set up the mapping for a certain IRQ line on a | |
1747 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
1748 | * stored inside the gpiochip. | |
1749 | */ | |
1b95b4eb TR |
1750 | int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, |
1751 | irq_hw_number_t hwirq) | |
14250520 LW |
1752 | { |
1753 | struct gpio_chip *chip = d->host_data; | |
e0d89728 | 1754 | int err = 0; |
14250520 | 1755 | |
dc749a09 GS |
1756 | if (!gpiochip_irqchip_irq_valid(chip, hwirq)) |
1757 | return -ENXIO; | |
1758 | ||
14250520 | 1759 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
1760 | /* |
1761 | * This lock class tells lockdep that GPIO irqs are in a different | |
1762 | * category than their parents, so it won't report false recursion. | |
1763 | */ | |
39c3fd58 | 1764 | irq_set_lockdep_class(irq, chip->irq.lock_key, chip->irq.request_key); |
c7a0aa59 | 1765 | irq_set_chip_and_handler(irq, chip->irq.chip, chip->irq.handler); |
d245b3f9 | 1766 | /* Chips that use nested thread handlers have them marked */ |
60ed54ca | 1767 | if (chip->irq.threaded) |
1c8732bb | 1768 | irq_set_nested_thread(irq, 1); |
14250520 | 1769 | irq_set_noprobe(irq); |
23393d49 | 1770 | |
e0d89728 TR |
1771 | if (chip->irq.num_parents == 1) |
1772 | err = irq_set_parent(irq, chip->irq.parents[0]); | |
1773 | else if (chip->irq.map) | |
1774 | err = irq_set_parent(irq, chip->irq.map[hwirq]); | |
1775 | ||
1776 | if (err < 0) | |
1777 | return err; | |
1778 | ||
1333b90f LW |
1779 | /* |
1780 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
1781 | * is passed as default type. | |
1782 | */ | |
3634eeb0 TR |
1783 | if (chip->irq.default_type != IRQ_TYPE_NONE) |
1784 | irq_set_irq_type(irq, chip->irq.default_type); | |
14250520 LW |
1785 | |
1786 | return 0; | |
1787 | } | |
1b95b4eb | 1788 | EXPORT_SYMBOL_GPL(gpiochip_irq_map); |
14250520 | 1789 | |
1b95b4eb | 1790 | void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
c3626fde | 1791 | { |
1c8732bb LW |
1792 | struct gpio_chip *chip = d->host_data; |
1793 | ||
60ed54ca | 1794 | if (chip->irq.threaded) |
1c8732bb | 1795 | irq_set_nested_thread(irq, 0); |
c3626fde LW |
1796 | irq_set_chip_and_handler(irq, NULL, NULL); |
1797 | irq_set_chip_data(irq, NULL); | |
1798 | } | |
1b95b4eb | 1799 | EXPORT_SYMBOL_GPL(gpiochip_irq_unmap); |
c3626fde | 1800 | |
14250520 LW |
1801 | static const struct irq_domain_ops gpiochip_domain_ops = { |
1802 | .map = gpiochip_irq_map, | |
c3626fde | 1803 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
1804 | /* Virtually all GPIO irqchips are twocell:ed */ |
1805 | .xlate = irq_domain_xlate_twocell, | |
1806 | }; | |
1807 | ||
4e6b8238 | 1808 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) |
14250520 | 1809 | { |
4e6b8238 HV |
1810 | if (!gpiochip_irqchip_irq_valid(chip, offset)) |
1811 | return -ENXIO; | |
5b76e79c | 1812 | |
4e6b8238 | 1813 | return irq_create_mapping(chip->irq.domain, offset); |
14250520 LW |
1814 | } |
1815 | ||
4e6b8238 | 1816 | static int gpiochip_irq_reqres(struct irq_data *d) |
14250520 LW |
1817 | { |
1818 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1819 | ||
4e6b8238 | 1820 | return gpiochip_reqres_irq(chip, d->hwirq); |
14250520 LW |
1821 | } |
1822 | ||
4e6b8238 | 1823 | static void gpiochip_irq_relres(struct irq_data *d) |
14250520 | 1824 | { |
4e6b8238 | 1825 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
e0d89728 | 1826 | |
4e6b8238 | 1827 | gpiochip_relres_irq(chip, d->hwirq); |
14250520 LW |
1828 | } |
1829 | ||
461c1a7d HV |
1830 | static void gpiochip_irq_enable(struct irq_data *d) |
1831 | { | |
1832 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1833 | ||
1834 | gpiochip_enable_irq(chip, d->hwirq); | |
1835 | if (chip->irq.irq_enable) | |
1836 | chip->irq.irq_enable(d); | |
1837 | else | |
1838 | chip->irq.chip->irq_unmask(d); | |
1839 | } | |
1840 | ||
1841 | static void gpiochip_irq_disable(struct irq_data *d) | |
1842 | { | |
1843 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
1844 | ||
1845 | if (chip->irq.irq_disable) | |
1846 | chip->irq.irq_disable(d); | |
1847 | else | |
1848 | chip->irq.chip->irq_mask(d); | |
1849 | gpiochip_disable_irq(chip, d->hwirq); | |
1850 | } | |
1851 | ||
ca620f2d HV |
1852 | static void gpiochip_set_irq_hooks(struct gpio_chip *gpiochip) |
1853 | { | |
1854 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1855 | ||
1856 | if (!irqchip->irq_request_resources && | |
1857 | !irqchip->irq_release_resources) { | |
1858 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
1859 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
1860 | } | |
461c1a7d HV |
1861 | if (WARN_ON(gpiochip->irq.irq_enable)) |
1862 | return; | |
171948ea HV |
1863 | /* Check if the irqchip already has this hook... */ |
1864 | if (irqchip->irq_enable == gpiochip_irq_enable) { | |
1865 | /* | |
1866 | * ...and if so, give a gentle warning that this is bad | |
1867 | * practice. | |
1868 | */ | |
1869 | chip_info(gpiochip, | |
1870 | "detected irqchip that is shared with multiple gpiochips: please fix the driver.\n"); | |
1871 | return; | |
1872 | } | |
461c1a7d HV |
1873 | gpiochip->irq.irq_enable = irqchip->irq_enable; |
1874 | gpiochip->irq.irq_disable = irqchip->irq_disable; | |
1875 | irqchip->irq_enable = gpiochip_irq_enable; | |
1876 | irqchip->irq_disable = gpiochip_irq_disable; | |
ca620f2d HV |
1877 | } |
1878 | ||
e0d89728 TR |
1879 | /** |
1880 | * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip | |
1881 | * @gpiochip: the GPIO chip to add the IRQ chip to | |
39c3fd58 AL |
1882 | * @lock_key: lockdep class for IRQ lock |
1883 | * @request_key: lockdep class for IRQ request | |
e0d89728 | 1884 | */ |
959bc7b2 | 1885 | static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
1886 | struct lock_class_key *lock_key, |
1887 | struct lock_class_key *request_key) | |
e0d89728 TR |
1888 | { |
1889 | struct irq_chip *irqchip = gpiochip->irq.chip; | |
1890 | const struct irq_domain_ops *ops; | |
1891 | struct device_node *np; | |
1892 | unsigned int type; | |
1893 | unsigned int i; | |
1894 | ||
1895 | if (!irqchip) | |
1896 | return 0; | |
1897 | ||
1898 | if (gpiochip->irq.parent_handler && gpiochip->can_sleep) { | |
b1911710 | 1899 | chip_err(gpiochip, "you cannot have chained interrupts on a chip that may sleep\n"); |
e0d89728 TR |
1900 | return -EINVAL; |
1901 | } | |
1902 | ||
1903 | np = gpiochip->gpiodev->dev.of_node; | |
1904 | type = gpiochip->irq.default_type; | |
1905 | ||
1906 | /* | |
1907 | * Specifying a default trigger is a terrible idea if DT or ACPI is | |
1908 | * used to configure the interrupts, as you may end up with | |
1909 | * conflicting triggers. Tell the user, and reset to NONE. | |
1910 | */ | |
1911 | if (WARN(np && type != IRQ_TYPE_NONE, | |
1912 | "%s: Ignoring %u default trigger\n", np->full_name, type)) | |
1913 | type = IRQ_TYPE_NONE; | |
1914 | ||
1915 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { | |
1916 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
1917 | "Ignoring %u default trigger\n", type); | |
1918 | type = IRQ_TYPE_NONE; | |
1919 | } | |
1920 | ||
1921 | gpiochip->to_irq = gpiochip_to_irq; | |
1922 | gpiochip->irq.default_type = type; | |
959bc7b2 | 1923 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 1924 | gpiochip->irq.request_key = request_key; |
e0d89728 TR |
1925 | |
1926 | if (gpiochip->irq.domain_ops) | |
1927 | ops = gpiochip->irq.domain_ops; | |
1928 | else | |
1929 | ops = &gpiochip_domain_ops; | |
1930 | ||
1931 | gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio, | |
8302cf58 TR |
1932 | gpiochip->irq.first, |
1933 | ops, gpiochip); | |
e0d89728 TR |
1934 | if (!gpiochip->irq.domain) |
1935 | return -EINVAL; | |
1936 | ||
e0d89728 TR |
1937 | if (gpiochip->irq.parent_handler) { |
1938 | void *data = gpiochip->irq.parent_handler_data ?: gpiochip; | |
1939 | ||
1940 | for (i = 0; i < gpiochip->irq.num_parents; i++) { | |
1941 | /* | |
1942 | * The parent IRQ chip is already using the chip_data | |
1943 | * for this IRQ chip, so our callbacks simply use the | |
1944 | * handler_data. | |
1945 | */ | |
1946 | irq_set_chained_handler_and_data(gpiochip->irq.parents[i], | |
1947 | gpiochip->irq.parent_handler, | |
1948 | data); | |
1949 | } | |
e0d89728 TR |
1950 | } |
1951 | ||
ca620f2d HV |
1952 | gpiochip_set_irq_hooks(gpiochip); |
1953 | ||
e0d89728 TR |
1954 | acpi_gpiochip_request_interrupts(gpiochip); |
1955 | ||
1956 | return 0; | |
1957 | } | |
1958 | ||
14250520 LW |
1959 | /** |
1960 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
1961 | * @gpiochip: the gpiochip to remove the irqchip from | |
1962 | * | |
1963 | * This is called only from gpiochip_remove() | |
1964 | */ | |
1965 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
1966 | { | |
ca620f2d | 1967 | struct irq_chip *irqchip = gpiochip->irq.chip; |
39e5f096 | 1968 | unsigned int offset; |
c3626fde | 1969 | |
afa82fab MW |
1970 | acpi_gpiochip_free_interrupts(gpiochip); |
1971 | ||
ca620f2d | 1972 | if (irqchip && gpiochip->irq.parent_handler) { |
39e5f096 TR |
1973 | struct gpio_irq_chip *irq = &gpiochip->irq; |
1974 | unsigned int i; | |
1975 | ||
1976 | for (i = 0; i < irq->num_parents; i++) | |
1977 | irq_set_chained_handler_and_data(irq->parents[i], | |
1978 | NULL, NULL); | |
25e4fe92 DES |
1979 | } |
1980 | ||
c3626fde | 1981 | /* Remove all IRQ mappings and delete the domain */ |
f0fbe7bc | 1982 | if (gpiochip->irq.domain) { |
39e5f096 TR |
1983 | unsigned int irq; |
1984 | ||
79b804cb MW |
1985 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
1986 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) | |
1987 | continue; | |
f0fbe7bc TR |
1988 | |
1989 | irq = irq_find_mapping(gpiochip->irq.domain, offset); | |
1990 | irq_dispose_mapping(irq); | |
79b804cb | 1991 | } |
f0fbe7bc TR |
1992 | |
1993 | irq_domain_remove(gpiochip->irq.domain); | |
c3626fde | 1994 | } |
14250520 | 1995 | |
461c1a7d HV |
1996 | if (irqchip) { |
1997 | if (irqchip->irq_request_resources == gpiochip_irq_reqres) { | |
1998 | irqchip->irq_request_resources = NULL; | |
1999 | irqchip->irq_release_resources = NULL; | |
2000 | } | |
2001 | if (irqchip->irq_enable == gpiochip_irq_enable) { | |
2002 | irqchip->irq_enable = gpiochip->irq.irq_enable; | |
2003 | irqchip->irq_disable = gpiochip->irq.irq_disable; | |
2004 | } | |
14250520 | 2005 | } |
461c1a7d HV |
2006 | gpiochip->irq.irq_enable = NULL; |
2007 | gpiochip->irq.irq_disable = NULL; | |
ca620f2d | 2008 | gpiochip->irq.chip = NULL; |
79b804cb MW |
2009 | |
2010 | gpiochip_irqchip_free_valid_mask(gpiochip); | |
14250520 LW |
2011 | } |
2012 | ||
2013 | /** | |
739e6f59 | 2014 | * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip |
14250520 LW |
2015 | * @gpiochip: the gpiochip to add the irqchip to |
2016 | * @irqchip: the irqchip to add to the gpiochip | |
2017 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
2018 | * allocate gpiochip irqs from | |
2019 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
2020 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
2021 | * to have the core avoid setting up any default type in the hardware. | |
60ed54ca | 2022 | * @threaded: whether this irqchip uses a nested thread handler |
39c3fd58 AL |
2023 | * @lock_key: lockdep class for IRQ lock |
2024 | * @request_key: lockdep class for IRQ request | |
14250520 LW |
2025 | * |
2026 | * This function closely associates a certain irqchip with a certain | |
2027 | * gpiochip, providing an irq domain to translate the local IRQs to | |
2028 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
2029 | * is passed as chip data to all related functions. Driver callbacks | |
09dd5f9e | 2030 | * need to use gpiochip_get_data() to get their local state containers back |
14250520 LW |
2031 | * from the gpiochip passed as chip data. An irqdomain will be stored |
2032 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
2033 | * translation. The gpiochip will need to be initialized and registered | |
2034 | * before calling this function. | |
2035 | * | |
c3626fde LW |
2036 | * This function will handle two cell:ed simple IRQs and assumes all |
2037 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
2038 | * need to be open coded. |
2039 | */ | |
739e6f59 LW |
2040 | int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, |
2041 | struct irq_chip *irqchip, | |
2042 | unsigned int first_irq, | |
2043 | irq_flow_handler_t handler, | |
2044 | unsigned int type, | |
60ed54ca | 2045 | bool threaded, |
39c3fd58 AL |
2046 | struct lock_class_key *lock_key, |
2047 | struct lock_class_key *request_key) | |
14250520 LW |
2048 | { |
2049 | struct device_node *of_node; | |
14250520 LW |
2050 | |
2051 | if (!gpiochip || !irqchip) | |
2052 | return -EINVAL; | |
2053 | ||
58383c78 | 2054 | if (!gpiochip->parent) { |
14250520 LW |
2055 | pr_err("missing gpiochip .dev parent pointer\n"); |
2056 | return -EINVAL; | |
2057 | } | |
60ed54ca | 2058 | gpiochip->irq.threaded = threaded; |
58383c78 | 2059 | of_node = gpiochip->parent->of_node; |
14250520 LW |
2060 | #ifdef CONFIG_OF_GPIO |
2061 | /* | |
20a8a968 | 2062 | * If the gpiochip has an assigned OF node this takes precedence |
c88402c2 BJZ |
2063 | * FIXME: get rid of this and use gpiochip->parent->of_node |
2064 | * everywhere | |
14250520 LW |
2065 | */ |
2066 | if (gpiochip->of_node) | |
2067 | of_node = gpiochip->of_node; | |
2068 | #endif | |
332e99d5 | 2069 | /* |
0a1e0053 | 2070 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
332e99d5 MZ |
2071 | * used to configure the interrupts, as you may end-up with |
2072 | * conflicting triggers. Tell the user, and reset to NONE. | |
2073 | */ | |
2074 | if (WARN(of_node && type != IRQ_TYPE_NONE, | |
7eb6ce2f | 2075 | "%pOF: Ignoring %d default trigger\n", of_node, type)) |
332e99d5 | 2076 | type = IRQ_TYPE_NONE; |
0a1e0053 MW |
2077 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
2078 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), | |
2079 | "Ignoring %d default trigger\n", type); | |
2080 | type = IRQ_TYPE_NONE; | |
2081 | } | |
332e99d5 | 2082 | |
da80ff81 | 2083 | gpiochip->irq.chip = irqchip; |
c7a0aa59 | 2084 | gpiochip->irq.handler = handler; |
3634eeb0 | 2085 | gpiochip->irq.default_type = type; |
14250520 | 2086 | gpiochip->to_irq = gpiochip_to_irq; |
ca9df053 | 2087 | gpiochip->irq.lock_key = lock_key; |
39c3fd58 | 2088 | gpiochip->irq.request_key = request_key; |
f0fbe7bc | 2089 | gpiochip->irq.domain = irq_domain_add_simple(of_node, |
14250520 LW |
2090 | gpiochip->ngpio, first_irq, |
2091 | &gpiochip_domain_ops, gpiochip); | |
f0fbe7bc | 2092 | if (!gpiochip->irq.domain) { |
da80ff81 | 2093 | gpiochip->irq.chip = NULL; |
14250520 LW |
2094 | return -EINVAL; |
2095 | } | |
8b67a1f0 | 2096 | |
ca620f2d | 2097 | gpiochip_set_irq_hooks(gpiochip); |
14250520 | 2098 | |
afa82fab MW |
2099 | acpi_gpiochip_request_interrupts(gpiochip); |
2100 | ||
14250520 LW |
2101 | return 0; |
2102 | } | |
739e6f59 | 2103 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); |
14250520 LW |
2104 | |
2105 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
2106 | ||
959bc7b2 | 2107 | static inline int gpiochip_add_irqchip(struct gpio_chip *gpiochip, |
39c3fd58 AL |
2108 | struct lock_class_key *lock_key, |
2109 | struct lock_class_key *request_key) | |
e0d89728 TR |
2110 | { |
2111 | return 0; | |
2112 | } | |
2113 | ||
14250520 | 2114 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} |
79b804cb MW |
2115 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
2116 | { | |
2117 | return 0; | |
2118 | } | |
2119 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) | |
2120 | { } | |
14250520 LW |
2121 | |
2122 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
2123 | ||
c771c2f4 JG |
2124 | /** |
2125 | * gpiochip_generic_request() - request the gpio function for a pin | |
2126 | * @chip: the gpiochip owning the GPIO | |
2127 | * @offset: the offset of the GPIO to request for GPIO function | |
2128 | */ | |
2129 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
2130 | { | |
a9a1d2a7 | 2131 | return pinctrl_gpio_request(chip->gpiodev->base + offset); |
c771c2f4 JG |
2132 | } |
2133 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
2134 | ||
2135 | /** | |
2136 | * gpiochip_generic_free() - free the gpio function from a pin | |
2137 | * @chip: the gpiochip to request the gpio function for | |
2138 | * @offset: the offset of the GPIO to free from GPIO function | |
2139 | */ | |
2140 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
2141 | { | |
a9a1d2a7 | 2142 | pinctrl_gpio_free(chip->gpiodev->base + offset); |
c771c2f4 JG |
2143 | } |
2144 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
2145 | ||
2956b5d9 MW |
2146 | /** |
2147 | * gpiochip_generic_config() - apply configuration for a pin | |
2148 | * @chip: the gpiochip owning the GPIO | |
2149 | * @offset: the offset of the GPIO to apply the configuration | |
2150 | * @config: the configuration to be applied | |
2151 | */ | |
2152 | int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, | |
2153 | unsigned long config) | |
2154 | { | |
2155 | return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); | |
2156 | } | |
2157 | EXPORT_SYMBOL_GPL(gpiochip_generic_config); | |
2158 | ||
f23f1516 | 2159 | #ifdef CONFIG_PINCTRL |
165adc9c | 2160 | |
586a87e6 CR |
2161 | /** |
2162 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
2163 | * @chip: the gpiochip to add the range for | |
d32651f6 | 2164 | * @pctldev: the pin controller to map to |
586a87e6 CR |
2165 | * @gpio_offset: the start offset in the current gpio_chip number space |
2166 | * @pin_group: name of the pin group inside the pin controller | |
973c1714 CL |
2167 | * |
2168 | * Calling this function directly from a DeviceTree-supported | |
2169 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2170 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2171 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
586a87e6 CR |
2172 | */ |
2173 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
2174 | struct pinctrl_dev *pctldev, | |
2175 | unsigned int gpio_offset, const char *pin_group) | |
2176 | { | |
2177 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2178 | struct gpio_device *gdev = chip->gpiodev; |
586a87e6 CR |
2179 | int ret; |
2180 | ||
2181 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
2182 | if (!pin_range) { | |
1a2a99c6 | 2183 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
2184 | return -ENOMEM; |
2185 | } | |
2186 | ||
2187 | /* Use local offset as range ID */ | |
2188 | pin_range->range.id = gpio_offset; | |
2189 | pin_range->range.gc = chip; | |
2190 | pin_range->range.name = chip->label; | |
fdeb8e15 | 2191 | pin_range->range.base = gdev->base + gpio_offset; |
586a87e6 CR |
2192 | pin_range->pctldev = pctldev; |
2193 | ||
2194 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
2195 | &pin_range->range.pins, | |
2196 | &pin_range->range.npins); | |
61c6375d MN |
2197 | if (ret < 0) { |
2198 | kfree(pin_range); | |
586a87e6 | 2199 | return ret; |
61c6375d | 2200 | } |
586a87e6 CR |
2201 | |
2202 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
2203 | ||
1a2a99c6 AS |
2204 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
2205 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
2206 | pinctrl_dev_get_devname(pctldev), pin_group); |
2207 | ||
20ec3e39 | 2208 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
586a87e6 CR |
2209 | |
2210 | return 0; | |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
2213 | ||
3f0f8670 LW |
2214 | /** |
2215 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
2216 | * @chip: the gpiochip to add the range for | |
950d55f5 | 2217 | * @pinctl_name: the dev_name() of the pin controller to map to |
316511c0 LW |
2218 | * @gpio_offset: the start offset in the current gpio_chip number space |
2219 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
2220 | * @npins: the number of pins from the offset of each pin space (GPIO and |
2221 | * pin controller) to accumulate in this range | |
950d55f5 TR |
2222 | * |
2223 | * Returns: | |
2224 | * 0 on success, or a negative error-code on failure. | |
973c1714 CL |
2225 | * |
2226 | * Calling this function directly from a DeviceTree-supported | |
2227 | * pinctrl driver is DEPRECATED. Please see Section 2.1 of | |
2228 | * Documentation/devicetree/bindings/gpio/gpio.txt on how to | |
2229 | * bind pinctrl and gpio drivers via the "gpio-ranges" property. | |
3f0f8670 | 2230 | */ |
1e63d7b9 | 2231 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 2232 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 2233 | unsigned int npins) |
f23f1516 SH |
2234 | { |
2235 | struct gpio_pin_range *pin_range; | |
fdeb8e15 | 2236 | struct gpio_device *gdev = chip->gpiodev; |
b4d4b1f0 | 2237 | int ret; |
f23f1516 | 2238 | |
3f0f8670 | 2239 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 2240 | if (!pin_range) { |
1a2a99c6 | 2241 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 2242 | return -ENOMEM; |
f23f1516 SH |
2243 | } |
2244 | ||
3f0f8670 | 2245 | /* Use local offset as range ID */ |
316511c0 | 2246 | pin_range->range.id = gpio_offset; |
3f0f8670 | 2247 | pin_range->range.gc = chip; |
f23f1516 | 2248 | pin_range->range.name = chip->label; |
fdeb8e15 | 2249 | pin_range->range.base = gdev->base + gpio_offset; |
316511c0 | 2250 | pin_range->range.pin_base = pin_offset; |
f23f1516 | 2251 | pin_range->range.npins = npins; |
192c369c | 2252 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 2253 | &pin_range->range); |
8f23ca1a | 2254 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 2255 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 2256 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 2257 | kfree(pin_range); |
b4d4b1f0 | 2258 | return ret; |
3f0f8670 | 2259 | } |
1a2a99c6 AS |
2260 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
2261 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
2262 | pinctl_name, |
2263 | pin_offset, pin_offset + npins - 1); | |
f23f1516 | 2264 | |
20ec3e39 | 2265 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
1e63d7b9 LW |
2266 | |
2267 | return 0; | |
f23f1516 | 2268 | } |
165adc9c | 2269 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 2270 | |
3f0f8670 LW |
2271 | /** |
2272 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
2273 | * @chip: the chip to remove all the mappings for | |
2274 | */ | |
f23f1516 SH |
2275 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
2276 | { | |
2277 | struct gpio_pin_range *pin_range, *tmp; | |
20ec3e39 | 2278 | struct gpio_device *gdev = chip->gpiodev; |
f23f1516 | 2279 | |
20ec3e39 | 2280 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
f23f1516 SH |
2281 | list_del(&pin_range->node); |
2282 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
2283 | &pin_range->range); | |
3f0f8670 | 2284 | kfree(pin_range); |
f23f1516 SH |
2285 | } |
2286 | } | |
165adc9c LW |
2287 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
2288 | ||
2289 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 2290 | |
d2876d08 DB |
2291 | /* These "optional" allocation calls help prevent drivers from stomping |
2292 | * on each other, and help provide better diagnostics in debugfs. | |
2293 | * They're called even less than the "set direction" calls. | |
2294 | */ | |
fac9d885 | 2295 | static int gpiod_request_commit(struct gpio_desc *desc, const char *label) |
d2876d08 | 2296 | { |
fdeb8e15 | 2297 | struct gpio_chip *chip = desc->gdev->chip; |
77c2d792 | 2298 | int status; |
d2876d08 | 2299 | unsigned long flags; |
3789f5ac | 2300 | unsigned offset; |
d2876d08 | 2301 | |
bcabdef1 AC |
2302 | spin_lock_irqsave(&gpio_lock, flags); |
2303 | ||
d2876d08 | 2304 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 2305 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
2306 | */ |
2307 | ||
2308 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
2309 | desc_set_label(desc, label ? : "?"); | |
2310 | status = 0; | |
438d8908 | 2311 | } else { |
d2876d08 | 2312 | status = -EBUSY; |
7460db56 | 2313 | goto done; |
35e8bb51 DB |
2314 | } |
2315 | ||
2316 | if (chip->request) { | |
2317 | /* chip->request may sleep */ | |
2318 | spin_unlock_irqrestore(&gpio_lock, flags); | |
3789f5ac BD |
2319 | offset = gpio_chip_hwgpio(desc); |
2320 | if (gpiochip_line_is_valid(chip, offset)) | |
2321 | status = chip->request(chip, offset); | |
2322 | else | |
2323 | status = -EINVAL; | |
35e8bb51 DB |
2324 | spin_lock_irqsave(&gpio_lock, flags); |
2325 | ||
2326 | if (status < 0) { | |
2327 | desc_set_label(desc, NULL); | |
35e8bb51 | 2328 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 2329 | goto done; |
35e8bb51 | 2330 | } |
438d8908 | 2331 | } |
80b0a602 MN |
2332 | if (chip->get_direction) { |
2333 | /* chip->get_direction may sleep */ | |
2334 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 2335 | gpiod_get_direction(desc); |
80b0a602 MN |
2336 | spin_lock_irqsave(&gpio_lock, flags); |
2337 | } | |
77c2d792 MW |
2338 | done: |
2339 | spin_unlock_irqrestore(&gpio_lock, flags); | |
2340 | return status; | |
2341 | } | |
2342 | ||
fdeb8e15 LW |
2343 | /* |
2344 | * This descriptor validation needs to be inserted verbatim into each | |
2345 | * function taking a descriptor, so we need to use a preprocessor | |
54d77198 LW |
2346 | * macro to avoid endless duplication. If the desc is NULL it is an |
2347 | * optional GPIO and calls should just bail out. | |
fdeb8e15 | 2348 | */ |
a746a232 RV |
2349 | static int validate_desc(const struct gpio_desc *desc, const char *func) |
2350 | { | |
2351 | if (!desc) | |
2352 | return 0; | |
2353 | if (IS_ERR(desc)) { | |
2354 | pr_warn("%s: invalid GPIO (errorpointer)\n", func); | |
2355 | return PTR_ERR(desc); | |
2356 | } | |
2357 | if (!desc->gdev) { | |
2358 | pr_warn("%s: invalid GPIO (no device)\n", func); | |
2359 | return -EINVAL; | |
2360 | } | |
2361 | if (!desc->gdev->chip) { | |
2362 | dev_warn(&desc->gdev->dev, | |
2363 | "%s: backing chip is gone\n", func); | |
2364 | return 0; | |
2365 | } | |
2366 | return 1; | |
2367 | } | |
2368 | ||
fdeb8e15 | 2369 | #define VALIDATE_DESC(desc) do { \ |
a746a232 RV |
2370 | int __valid = validate_desc(desc, __func__); \ |
2371 | if (__valid <= 0) \ | |
2372 | return __valid; \ | |
2373 | } while (0) | |
fdeb8e15 LW |
2374 | |
2375 | #define VALIDATE_DESC_VOID(desc) do { \ | |
a746a232 RV |
2376 | int __valid = validate_desc(desc, __func__); \ |
2377 | if (__valid <= 0) \ | |
fdeb8e15 | 2378 | return; \ |
a746a232 | 2379 | } while (0) |
fdeb8e15 | 2380 | |
0eb4c6c2 | 2381 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
2382 | { |
2383 | int status = -EPROBE_DEFER; | |
fdeb8e15 | 2384 | struct gpio_device *gdev; |
77c2d792 | 2385 | |
fdeb8e15 LW |
2386 | VALIDATE_DESC(desc); |
2387 | gdev = desc->gdev; | |
77c2d792 | 2388 | |
fdeb8e15 | 2389 | if (try_module_get(gdev->owner)) { |
fac9d885 | 2390 | status = gpiod_request_commit(desc, label); |
77c2d792 | 2391 | if (status < 0) |
fdeb8e15 | 2392 | module_put(gdev->owner); |
33a68e86 LW |
2393 | else |
2394 | get_device(&gdev->dev); | |
77c2d792 MW |
2395 | } |
2396 | ||
d2876d08 | 2397 | if (status) |
7589e59f | 2398 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 2399 | |
d2876d08 DB |
2400 | return status; |
2401 | } | |
372e722e | 2402 | |
fac9d885 | 2403 | static bool gpiod_free_commit(struct gpio_desc *desc) |
d2876d08 | 2404 | { |
77c2d792 | 2405 | bool ret = false; |
d2876d08 | 2406 | unsigned long flags; |
35e8bb51 | 2407 | struct gpio_chip *chip; |
d2876d08 | 2408 | |
3d599d1c UKK |
2409 | might_sleep(); |
2410 | ||
372e722e | 2411 | gpiod_unexport(desc); |
d8f388d8 | 2412 | |
d2876d08 DB |
2413 | spin_lock_irqsave(&gpio_lock, flags); |
2414 | ||
fdeb8e15 | 2415 | chip = desc->gdev->chip; |
35e8bb51 DB |
2416 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
2417 | if (chip->free) { | |
2418 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 2419 | might_sleep_if(chip->can_sleep); |
372e722e | 2420 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
2421 | spin_lock_irqsave(&gpio_lock, flags); |
2422 | } | |
d2876d08 | 2423 | desc_set_label(desc, NULL); |
07697461 | 2424 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 2425 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 2426 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 2427 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 2428 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
2429 | ret = true; |
2430 | } | |
d2876d08 DB |
2431 | |
2432 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
2433 | return ret; |
2434 | } | |
2435 | ||
0eb4c6c2 | 2436 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 | 2437 | { |
fac9d885 | 2438 | if (desc && desc->gdev && gpiod_free_commit(desc)) { |
fdeb8e15 | 2439 | module_put(desc->gdev->owner); |
33a68e86 LW |
2440 | put_device(&desc->gdev->dev); |
2441 | } else { | |
77c2d792 | 2442 | WARN_ON(extra_checks); |
33a68e86 | 2443 | } |
d2876d08 | 2444 | } |
372e722e | 2445 | |
d2876d08 DB |
2446 | /** |
2447 | * gpiochip_is_requested - return string iff signal was requested | |
2448 | * @chip: controller managing the signal | |
2449 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
2450 | * | |
2451 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
2452 | * The string returned is the label passed to gpio_request(); if none has been |
2453 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
2454 | * |
2455 | * This function is for use by GPIO controller drivers. The label can | |
2456 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
2457 | * can help avoid accidentally multiplexing it to another controller. | |
2458 | */ | |
2459 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
2460 | { | |
6c0b4e6c | 2461 | struct gpio_desc *desc; |
d2876d08 | 2462 | |
48b5953e | 2463 | if (offset >= chip->ngpio) |
d2876d08 | 2464 | return NULL; |
6c0b4e6c | 2465 | |
1c3cdb18 | 2466 | desc = &chip->gpiodev->descs[offset]; |
6c0b4e6c | 2467 | |
372e722e | 2468 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 2469 | return NULL; |
372e722e | 2470 | return desc->label; |
d2876d08 DB |
2471 | } |
2472 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
2473 | ||
77c2d792 MW |
2474 | /** |
2475 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
950d55f5 TR |
2476 | * @chip: GPIO chip |
2477 | * @hwnum: hardware number of the GPIO for which to request the descriptor | |
77c2d792 MW |
2478 | * @label: label for the GPIO |
2479 | * | |
2480 | * Function allows GPIO chip drivers to request and use their own GPIO | |
2481 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
2482 | * function will not increase reference count of the GPIO chip module. This | |
2483 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
2484 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
950d55f5 TR |
2485 | * |
2486 | * Returns: | |
2487 | * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error | |
2488 | * code on failure. | |
77c2d792 | 2489 | */ |
abdc08a3 AC |
2490 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
2491 | const char *label) | |
77c2d792 | 2492 | { |
abdc08a3 AC |
2493 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
2494 | int err; | |
77c2d792 | 2495 | |
abdc08a3 AC |
2496 | if (IS_ERR(desc)) { |
2497 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
2498 | return desc; | |
2499 | } | |
2500 | ||
fac9d885 | 2501 | err = gpiod_request_commit(desc, label); |
abdc08a3 AC |
2502 | if (err < 0) |
2503 | return ERR_PTR(err); | |
77c2d792 | 2504 | |
abdc08a3 | 2505 | return desc; |
77c2d792 | 2506 | } |
f7d4ad98 | 2507 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
2508 | |
2509 | /** | |
2510 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
2511 | * @desc: GPIO descriptor to free | |
2512 | * | |
2513 | * Function frees the given GPIO requested previously with | |
2514 | * gpiochip_request_own_desc(). | |
2515 | */ | |
2516 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
2517 | { | |
2518 | if (desc) | |
fac9d885 | 2519 | gpiod_free_commit(desc); |
77c2d792 | 2520 | } |
f7d4ad98 | 2521 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 | 2522 | |
fdeb8e15 LW |
2523 | /* |
2524 | * Drivers MUST set GPIO direction before making get/set calls. In | |
d2876d08 DB |
2525 | * some cases this is done in early boot, before IRQs are enabled. |
2526 | * | |
2527 | * As a rule these aren't called more than once (except for drivers | |
2528 | * using the open-drain emulation idiom) so these are natural places | |
2529 | * to accumulate extra debugging checks. Note that we can't (yet) | |
2530 | * rely on gpio_request() having been called beforehand. | |
2531 | */ | |
2532 | ||
79a9becd AC |
2533 | /** |
2534 | * gpiod_direction_input - set the GPIO direction to input | |
2535 | * @desc: GPIO to set to input | |
2536 | * | |
2537 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
2538 | * be called safely on it. | |
2539 | * | |
2540 | * Return 0 in case of success, else an error code. | |
2541 | */ | |
2542 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 2543 | { |
d2876d08 | 2544 | struct gpio_chip *chip; |
d2876d08 DB |
2545 | int status = -EINVAL; |
2546 | ||
fdeb8e15 LW |
2547 | VALIDATE_DESC(desc); |
2548 | chip = desc->gdev->chip; | |
bcabdef1 | 2549 | |
be1a4b13 | 2550 | if (!chip->get || !chip->direction_input) { |
6424de5a MB |
2551 | gpiod_warn(desc, |
2552 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 2553 | __func__); |
be1a4b13 LW |
2554 | return -EIO; |
2555 | } | |
2556 | ||
d82da797 | 2557 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
2558 | if (status == 0) |
2559 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 2560 | |
372e722e | 2561 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 2562 | |
d2876d08 DB |
2563 | return status; |
2564 | } | |
79a9becd | 2565 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 2566 | |
2956b5d9 MW |
2567 | static int gpio_set_drive_single_ended(struct gpio_chip *gc, unsigned offset, |
2568 | enum pin_config_param mode) | |
2569 | { | |
2570 | unsigned long config = { PIN_CONF_PACKED(mode, 0) }; | |
2571 | ||
2572 | return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP; | |
2573 | } | |
2574 | ||
fac9d885 | 2575 | static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) |
d2876d08 | 2576 | { |
c663e5f5 | 2577 | struct gpio_chip *gc = desc->gdev->chip; |
ad17731d | 2578 | int val = !!value; |
c663e5f5 | 2579 | int ret; |
d2876d08 | 2580 | |
c663e5f5 | 2581 | if (!gc->set || !gc->direction_output) { |
6424de5a MB |
2582 | gpiod_warn(desc, |
2583 | "%s: missing set() or direction_output() operations\n", | |
2584 | __func__); | |
be1a4b13 LW |
2585 | return -EIO; |
2586 | } | |
2587 | ||
ad17731d | 2588 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); |
c663e5f5 | 2589 | if (!ret) |
d2876d08 | 2590 | set_bit(FLAG_IS_OUT, &desc->flags); |
ad17731d | 2591 | trace_gpio_value(desc_to_gpio(desc), 0, val); |
c663e5f5 LW |
2592 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
2593 | return ret; | |
d2876d08 | 2594 | } |
ef70bbe1 PZ |
2595 | |
2596 | /** | |
2597 | * gpiod_direction_output_raw - set the GPIO direction to output | |
2598 | * @desc: GPIO to set to output | |
2599 | * @value: initial output value of the GPIO | |
2600 | * | |
2601 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2602 | * be called safely on it. The initial value of the output must be specified | |
2603 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
2604 | * | |
2605 | * Return 0 in case of success, else an error code. | |
2606 | */ | |
2607 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
2608 | { | |
fdeb8e15 | 2609 | VALIDATE_DESC(desc); |
fac9d885 | 2610 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 PZ |
2611 | } |
2612 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
2613 | ||
2614 | /** | |
90df4fe0 | 2615 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
2616 | * @desc: GPIO to set to output |
2617 | * @value: initial output value of the GPIO | |
2618 | * | |
2619 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
2620 | * be called safely on it. The initial value of the output must be specified | |
2621 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
2622 | * account. | |
2623 | * | |
2624 | * Return 0 in case of success, else an error code. | |
2625 | */ | |
2626 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
2627 | { | |
30322bcf | 2628 | struct gpio_chip *gc; |
02e47980 LW |
2629 | int ret; |
2630 | ||
fdeb8e15 | 2631 | VALIDATE_DESC(desc); |
ef70bbe1 PZ |
2632 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2633 | value = !value; | |
ad17731d LW |
2634 | else |
2635 | value = !!value; | |
02e47980 | 2636 | |
4e9439dd HV |
2637 | /* GPIOs used for enabled IRQs shall not be set as output */ |
2638 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) && | |
2639 | test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) { | |
02e47980 LW |
2640 | gpiod_err(desc, |
2641 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
2642 | __func__); | |
2643 | return -EIO; | |
2644 | } | |
2645 | ||
30322bcf | 2646 | gc = desc->gdev->chip; |
02e47980 LW |
2647 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
2648 | /* First see if we can enable open drain in hardware */ | |
2649 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2650 | PIN_CONFIG_DRIVE_OPEN_DRAIN); | |
2651 | if (!ret) | |
2652 | goto set_output_value; | |
2653 | /* Emulate open drain by not actively driving the line high */ | |
2654 | if (value) | |
2655 | return gpiod_direction_input(desc); | |
2656 | } | |
2657 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { | |
2658 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2659 | PIN_CONFIG_DRIVE_OPEN_SOURCE); | |
2660 | if (!ret) | |
2661 | goto set_output_value; | |
2662 | /* Emulate open source by not actively driving the line low */ | |
2663 | if (!value) | |
2664 | return gpiod_direction_input(desc); | |
2665 | } else { | |
2666 | gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), | |
2667 | PIN_CONFIG_DRIVE_PUSH_PULL); | |
2668 | } | |
2669 | ||
2670 | set_output_value: | |
fac9d885 | 2671 | return gpiod_direction_output_raw_commit(desc, value); |
ef70bbe1 | 2672 | } |
79a9becd | 2673 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 2674 | |
c4b5be98 | 2675 | /** |
950d55f5 TR |
2676 | * gpiod_set_debounce - sets @debounce time for a GPIO |
2677 | * @desc: descriptor of the GPIO for which to set debounce time | |
2678 | * @debounce: debounce time in microseconds | |
65d87656 | 2679 | * |
950d55f5 TR |
2680 | * Returns: |
2681 | * 0 on success, %-ENOTSUPP if the controller doesn't support setting the | |
2682 | * debounce time. | |
c4b5be98 | 2683 | */ |
79a9becd | 2684 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 2685 | { |
c4b5be98 | 2686 | struct gpio_chip *chip; |
2956b5d9 | 2687 | unsigned long config; |
c4b5be98 | 2688 | |
fdeb8e15 LW |
2689 | VALIDATE_DESC(desc); |
2690 | chip = desc->gdev->chip; | |
2956b5d9 | 2691 | if (!chip->set || !chip->set_config) { |
6424de5a | 2692 | gpiod_dbg(desc, |
2956b5d9 | 2693 | "%s: missing set() or set_config() operations\n", |
6424de5a | 2694 | __func__); |
65d87656 | 2695 | return -ENOTSUPP; |
be1a4b13 LW |
2696 | } |
2697 | ||
2956b5d9 MW |
2698 | config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
2699 | return chip->set_config(chip, gpio_chip_hwgpio(desc), config); | |
c4b5be98 | 2700 | } |
79a9becd | 2701 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 2702 | |
e10f72bf AJ |
2703 | /** |
2704 | * gpiod_set_transitory - Lose or retain GPIO state on suspend or reset | |
2705 | * @desc: descriptor of the GPIO for which to configure persistence | |
2706 | * @transitory: True to lose state on suspend or reset, false for persistence | |
2707 | * | |
2708 | * Returns: | |
2709 | * 0 on success, otherwise a negative error code. | |
2710 | */ | |
2711 | int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) | |
2712 | { | |
2713 | struct gpio_chip *chip; | |
2714 | unsigned long packed; | |
2715 | int gpio; | |
2716 | int rc; | |
2717 | ||
156dd392 | 2718 | VALIDATE_DESC(desc); |
e10f72bf AJ |
2719 | /* |
2720 | * Handle FLAG_TRANSITORY first, enabling queries to gpiolib for | |
2721 | * persistence state. | |
2722 | */ | |
2723 | if (transitory) | |
2724 | set_bit(FLAG_TRANSITORY, &desc->flags); | |
2725 | else | |
2726 | clear_bit(FLAG_TRANSITORY, &desc->flags); | |
2727 | ||
2728 | /* If the driver supports it, set the persistence state now */ | |
2729 | chip = desc->gdev->chip; | |
2730 | if (!chip->set_config) | |
2731 | return 0; | |
2732 | ||
2733 | packed = pinconf_to_config_packed(PIN_CONFIG_PERSIST_STATE, | |
2734 | !transitory); | |
2735 | gpio = gpio_chip_hwgpio(desc); | |
2736 | rc = chip->set_config(chip, gpio, packed); | |
2737 | if (rc == -ENOTSUPP) { | |
2738 | dev_dbg(&desc->gdev->dev, "Persistence not supported for GPIO %d\n", | |
2739 | gpio); | |
2740 | return 0; | |
2741 | } | |
2742 | ||
2743 | return rc; | |
2744 | } | |
2745 | EXPORT_SYMBOL_GPL(gpiod_set_transitory); | |
2746 | ||
79a9becd AC |
2747 | /** |
2748 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
2749 | * @desc: the gpio descriptor to test | |
2750 | * | |
2751 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
2752 | */ | |
2753 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 2754 | { |
fdeb8e15 | 2755 | VALIDATE_DESC(desc); |
79a9becd | 2756 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 2757 | } |
79a9becd | 2758 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
2759 | |
2760 | /* I/O calls are only valid after configuration completed; the relevant | |
2761 | * "is this a valid GPIO" error checks should already have been done. | |
2762 | * | |
2763 | * "Get" operations are often inlinable as reading a pin value register, | |
2764 | * and masking the relevant bit in that register. | |
2765 | * | |
2766 | * When "set" operations are inlinable, they involve writing that mask to | |
2767 | * one register to set a low value, or a different register to set it high. | |
2768 | * Otherwise locking is needed, so there may be little value to inlining. | |
2769 | * | |
2770 | *------------------------------------------------------------------------ | |
2771 | * | |
2772 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
2773 | * have requested the GPIO. That can include implicit requesting by | |
2774 | * a direction setting call. Marking a gpio as requested locks its chip | |
2775 | * in memory, guaranteeing that these table lookups need no more locking | |
2776 | * and that gpiochip_remove() will fail. | |
2777 | * | |
2778 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
2779 | * that the GPIO was actually requested. | |
2780 | */ | |
2781 | ||
fac9d885 | 2782 | static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) |
d2876d08 DB |
2783 | { |
2784 | struct gpio_chip *chip; | |
372e722e | 2785 | int offset; |
e20538b8 | 2786 | int value; |
d2876d08 | 2787 | |
fdeb8e15 | 2788 | chip = desc->gdev->chip; |
372e722e | 2789 | offset = gpio_chip_hwgpio(desc); |
e20538b8 | 2790 | value = chip->get ? chip->get(chip, offset) : -EIO; |
723a6303 | 2791 | value = value < 0 ? value : !!value; |
372e722e | 2792 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 2793 | return value; |
d2876d08 | 2794 | } |
372e722e | 2795 | |
eec1d566 LW |
2796 | static int gpio_chip_get_multiple(struct gpio_chip *chip, |
2797 | unsigned long *mask, unsigned long *bits) | |
2798 | { | |
2799 | if (chip->get_multiple) { | |
2800 | return chip->get_multiple(chip, mask, bits); | |
2801 | } else if (chip->get) { | |
2802 | int i, value; | |
2803 | ||
2804 | for_each_set_bit(i, mask, chip->ngpio) { | |
2805 | value = chip->get(chip, i); | |
2806 | if (value < 0) | |
2807 | return value; | |
2808 | __assign_bit(i, bits, value); | |
2809 | } | |
2810 | return 0; | |
2811 | } | |
2812 | return -EIO; | |
2813 | } | |
2814 | ||
2815 | int gpiod_get_array_value_complex(bool raw, bool can_sleep, | |
2816 | unsigned int array_size, | |
2817 | struct gpio_desc **desc_array, | |
77588c14 | 2818 | struct gpio_array *array_info, |
b9762beb | 2819 | unsigned long *value_bitmap) |
eec1d566 | 2820 | { |
b17566a6 JK |
2821 | int err, i = 0; |
2822 | ||
2823 | /* | |
2824 | * Validate array_info against desc_array and its size. | |
2825 | * It should immediately follow desc_array if both | |
2826 | * have been obtained from the same gpiod_get_array() call. | |
2827 | */ | |
2828 | if (array_info && array_info->desc == desc_array && | |
2829 | array_size <= array_info->size && | |
2830 | (void *)array_info == desc_array + array_info->size) { | |
2831 | if (!can_sleep) | |
2832 | WARN_ON(array_info->chip->can_sleep); | |
2833 | ||
2834 | err = gpio_chip_get_multiple(array_info->chip, | |
2835 | array_info->get_mask, | |
2836 | value_bitmap); | |
2837 | if (err) | |
2838 | return err; | |
2839 | ||
2840 | if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) | |
2841 | bitmap_xor(value_bitmap, value_bitmap, | |
2842 | array_info->invert_mask, array_size); | |
2843 | ||
2844 | if (bitmap_full(array_info->get_mask, array_size)) | |
2845 | return 0; | |
2846 | ||
2847 | i = find_first_zero_bit(array_info->get_mask, array_size); | |
2848 | } else { | |
2849 | array_info = NULL; | |
2850 | } | |
eec1d566 LW |
2851 | |
2852 | while (i < array_size) { | |
2853 | struct gpio_chip *chip = desc_array[i]->gdev->chip; | |
3027743f LA |
2854 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
2855 | unsigned long *mask, *bits; | |
eec1d566 LW |
2856 | int first, j, ret; |
2857 | ||
3027743f LA |
2858 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
2859 | mask = fastpath; | |
2860 | } else { | |
2861 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
2862 | sizeof(*mask), | |
2863 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
2864 | if (!mask) | |
2865 | return -ENOMEM; | |
2866 | } | |
2867 | ||
2868 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
2869 | bitmap_zero(mask, chip->ngpio); | |
2870 | ||
eec1d566 LW |
2871 | if (!can_sleep) |
2872 | WARN_ON(chip->can_sleep); | |
2873 | ||
2874 | /* collect all inputs belonging to the same chip */ | |
2875 | first = i; | |
eec1d566 LW |
2876 | do { |
2877 | const struct gpio_desc *desc = desc_array[i]; | |
2878 | int hwgpio = gpio_chip_hwgpio(desc); | |
2879 | ||
2880 | __set_bit(hwgpio, mask); | |
b17566a6 JK |
2881 | |
2882 | if (array_info) | |
35ae7f96 JK |
2883 | i = find_next_zero_bit(array_info->get_mask, |
2884 | array_size, i); | |
b17566a6 JK |
2885 | else |
2886 | i++; | |
eec1d566 LW |
2887 | } while ((i < array_size) && |
2888 | (desc_array[i]->gdev->chip == chip)); | |
2889 | ||
2890 | ret = gpio_chip_get_multiple(chip, mask, bits); | |
3027743f LA |
2891 | if (ret) { |
2892 | if (mask != fastpath) | |
2893 | kfree(mask); | |
eec1d566 | 2894 | return ret; |
3027743f | 2895 | } |
eec1d566 | 2896 | |
b17566a6 | 2897 | for (j = first; j < i; ) { |
eec1d566 LW |
2898 | const struct gpio_desc *desc = desc_array[j]; |
2899 | int hwgpio = gpio_chip_hwgpio(desc); | |
2900 | int value = test_bit(hwgpio, bits); | |
2901 | ||
2902 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
2903 | value = !value; | |
b9762beb | 2904 | __assign_bit(j, value_bitmap, value); |
eec1d566 | 2905 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
b17566a6 JK |
2906 | |
2907 | if (array_info) | |
35ae7f96 JK |
2908 | j = find_next_zero_bit(array_info->get_mask, i, |
2909 | j); | |
b17566a6 JK |
2910 | else |
2911 | j++; | |
eec1d566 | 2912 | } |
3027743f LA |
2913 | |
2914 | if (mask != fastpath) | |
2915 | kfree(mask); | |
eec1d566 LW |
2916 | } |
2917 | return 0; | |
2918 | } | |
2919 | ||
d2876d08 | 2920 | /** |
79a9becd AC |
2921 | * gpiod_get_raw_value() - return a gpio's raw value |
2922 | * @desc: gpio whose value will be returned | |
d2876d08 | 2923 | * |
79a9becd | 2924 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 2925 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
2926 | * |
2927 | * This function should be called from contexts where we cannot sleep, and will | |
2928 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 2929 | */ |
79a9becd | 2930 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 2931 | { |
fdeb8e15 | 2932 | VALIDATE_DESC(desc); |
e4e449e8 | 2933 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2934 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 2935 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 2936 | } |
79a9becd | 2937 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 2938 | |
79a9becd AC |
2939 | /** |
2940 | * gpiod_get_value() - return a gpio's value | |
2941 | * @desc: gpio whose value will be returned | |
2942 | * | |
2943 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 2944 | * account, or negative errno on failure. |
79a9becd AC |
2945 | * |
2946 | * This function should be called from contexts where we cannot sleep, and will | |
2947 | * complain if the GPIO chip functions potentially sleep. | |
2948 | */ | |
2949 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 2950 | { |
79a9becd | 2951 | int value; |
fdeb8e15 LW |
2952 | |
2953 | VALIDATE_DESC(desc); | |
79a9becd | 2954 | /* Should be using gpio_get_value_cansleep() */ |
fdeb8e15 | 2955 | WARN_ON(desc->gdev->chip->can_sleep); |
79a9becd | 2956 | |
fac9d885 | 2957 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
2958 | if (value < 0) |
2959 | return value; | |
2960 | ||
79a9becd AC |
2961 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
2962 | value = !value; | |
2963 | ||
2964 | return value; | |
372e722e | 2965 | } |
79a9becd | 2966 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 2967 | |
eec1d566 LW |
2968 | /** |
2969 | * gpiod_get_raw_array_value() - read raw values from an array of GPIOs | |
b9762beb | 2970 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 2971 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 2972 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 2973 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
2974 | * |
2975 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
2976 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
2977 | * else an error code. | |
2978 | * | |
2979 | * This function should be called from contexts where we cannot sleep, | |
2980 | * and it will complain if the GPIO chip functions potentially sleep. | |
2981 | */ | |
2982 | int gpiod_get_raw_array_value(unsigned int array_size, | |
b9762beb | 2983 | struct gpio_desc **desc_array, |
77588c14 | 2984 | struct gpio_array *array_info, |
b9762beb | 2985 | unsigned long *value_bitmap) |
eec1d566 LW |
2986 | { |
2987 | if (!desc_array) | |
2988 | return -EINVAL; | |
2989 | return gpiod_get_array_value_complex(true, false, array_size, | |
77588c14 JK |
2990 | desc_array, array_info, |
2991 | value_bitmap); | |
eec1d566 LW |
2992 | } |
2993 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value); | |
2994 | ||
2995 | /** | |
2996 | * gpiod_get_array_value() - read values from an array of GPIOs | |
b9762beb | 2997 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 2998 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 2999 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3000 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3001 | * |
3002 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3003 | * into account. Return 0 in case of success, else an error code. | |
3004 | * | |
3005 | * This function should be called from contexts where we cannot sleep, | |
3006 | * and it will complain if the GPIO chip functions potentially sleep. | |
3007 | */ | |
3008 | int gpiod_get_array_value(unsigned int array_size, | |
b9762beb | 3009 | struct gpio_desc **desc_array, |
77588c14 | 3010 | struct gpio_array *array_info, |
b9762beb | 3011 | unsigned long *value_bitmap) |
eec1d566 LW |
3012 | { |
3013 | if (!desc_array) | |
3014 | return -EINVAL; | |
3015 | return gpiod_get_array_value_complex(false, false, array_size, | |
77588c14 JK |
3016 | desc_array, array_info, |
3017 | value_bitmap); | |
eec1d566 LW |
3018 | } |
3019 | EXPORT_SYMBOL_GPL(gpiod_get_array_value); | |
3020 | ||
aca5ce14 | 3021 | /* |
fac9d885 | 3022 | * gpio_set_open_drain_value_commit() - Set the open drain gpio's value. |
79a9becd | 3023 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 3024 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 3025 | */ |
fac9d885 | 3026 | static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
3027 | { |
3028 | int err = 0; | |
fdeb8e15 | 3029 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
3030 | int offset = gpio_chip_hwgpio(desc); |
3031 | ||
aca5ce14 | 3032 | if (value) { |
372e722e | 3033 | err = chip->direction_input(chip, offset); |
aca5ce14 | 3034 | if (!err) |
372e722e | 3035 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 3036 | } else { |
372e722e | 3037 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 3038 | if (!err) |
372e722e | 3039 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 3040 | } |
372e722e | 3041 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 3042 | if (err < 0) |
6424de5a MB |
3043 | gpiod_err(desc, |
3044 | "%s: Error in set_value for open drain err %d\n", | |
3045 | __func__, err); | |
aca5ce14 LD |
3046 | } |
3047 | ||
25553ff0 | 3048 | /* |
79a9becd AC |
3049 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
3050 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 3051 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 3052 | */ |
fac9d885 | 3053 | static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) |
25553ff0 LD |
3054 | { |
3055 | int err = 0; | |
fdeb8e15 | 3056 | struct gpio_chip *chip = desc->gdev->chip; |
372e722e AC |
3057 | int offset = gpio_chip_hwgpio(desc); |
3058 | ||
25553ff0 | 3059 | if (value) { |
372e722e | 3060 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 3061 | if (!err) |
372e722e | 3062 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 3063 | } else { |
372e722e | 3064 | err = chip->direction_input(chip, offset); |
25553ff0 | 3065 | if (!err) |
372e722e | 3066 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 3067 | } |
372e722e | 3068 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 3069 | if (err < 0) |
6424de5a MB |
3070 | gpiod_err(desc, |
3071 | "%s: Error in set_value for open source err %d\n", | |
3072 | __func__, err); | |
25553ff0 LD |
3073 | } |
3074 | ||
fac9d885 | 3075 | static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) |
d2876d08 DB |
3076 | { |
3077 | struct gpio_chip *chip; | |
3078 | ||
fdeb8e15 | 3079 | chip = desc->gdev->chip; |
372e722e | 3080 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
02e47980 | 3081 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
372e722e AC |
3082 | } |
3083 | ||
5f424243 RI |
3084 | /* |
3085 | * set multiple outputs on the same chip; | |
3086 | * use the chip's set_multiple function if available; | |
3087 | * otherwise set the outputs sequentially; | |
3088 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
3089 | * defines which outputs are to be changed | |
3090 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
3091 | * defines the values the outputs specified by mask are to be set to | |
3092 | */ | |
3093 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
3094 | unsigned long *mask, unsigned long *bits) | |
3095 | { | |
3096 | if (chip->set_multiple) { | |
3097 | chip->set_multiple(chip, mask, bits); | |
3098 | } else { | |
5e4e6fb3 AS |
3099 | unsigned int i; |
3100 | ||
3101 | /* set outputs if the corresponding mask bit is set */ | |
3102 | for_each_set_bit(i, mask, chip->ngpio) | |
3103 | chip->set(chip, i, test_bit(i, bits)); | |
5f424243 RI |
3104 | } |
3105 | } | |
3106 | ||
3027743f | 3107 | int gpiod_set_array_value_complex(bool raw, bool can_sleep, |
44c7288f LW |
3108 | unsigned int array_size, |
3109 | struct gpio_desc **desc_array, | |
77588c14 | 3110 | struct gpio_array *array_info, |
b9762beb | 3111 | unsigned long *value_bitmap) |
5f424243 RI |
3112 | { |
3113 | int i = 0; | |
3114 | ||
b17566a6 JK |
3115 | /* |
3116 | * Validate array_info against desc_array and its size. | |
3117 | * It should immediately follow desc_array if both | |
3118 | * have been obtained from the same gpiod_get_array() call. | |
3119 | */ | |
3120 | if (array_info && array_info->desc == desc_array && | |
3121 | array_size <= array_info->size && | |
3122 | (void *)array_info == desc_array + array_info->size) { | |
3123 | if (!can_sleep) | |
3124 | WARN_ON(array_info->chip->can_sleep); | |
3125 | ||
3126 | if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) | |
3127 | bitmap_xor(value_bitmap, value_bitmap, | |
3128 | array_info->invert_mask, array_size); | |
3129 | ||
3130 | gpio_chip_set_multiple(array_info->chip, array_info->set_mask, | |
3131 | value_bitmap); | |
3132 | ||
3133 | if (bitmap_full(array_info->set_mask, array_size)) | |
3134 | return 0; | |
3135 | ||
3136 | i = find_first_zero_bit(array_info->set_mask, array_size); | |
3137 | } else { | |
3138 | array_info = NULL; | |
3139 | } | |
3140 | ||
5f424243 | 3141 | while (i < array_size) { |
fdeb8e15 | 3142 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
3027743f LA |
3143 | unsigned long fastpath[2 * BITS_TO_LONGS(FASTPATH_NGPIO)]; |
3144 | unsigned long *mask, *bits; | |
5f424243 RI |
3145 | int count = 0; |
3146 | ||
3027743f LA |
3147 | if (likely(chip->ngpio <= FASTPATH_NGPIO)) { |
3148 | mask = fastpath; | |
3149 | } else { | |
3150 | mask = kmalloc_array(2 * BITS_TO_LONGS(chip->ngpio), | |
3151 | sizeof(*mask), | |
3152 | can_sleep ? GFP_KERNEL : GFP_ATOMIC); | |
3153 | if (!mask) | |
3154 | return -ENOMEM; | |
3155 | } | |
3156 | ||
3157 | bits = mask + BITS_TO_LONGS(chip->ngpio); | |
3158 | bitmap_zero(mask, chip->ngpio); | |
3159 | ||
38e003f4 | 3160 | if (!can_sleep) |
5f424243 | 3161 | WARN_ON(chip->can_sleep); |
38e003f4 | 3162 | |
5f424243 RI |
3163 | do { |
3164 | struct gpio_desc *desc = desc_array[i]; | |
3165 | int hwgpio = gpio_chip_hwgpio(desc); | |
b9762beb | 3166 | int value = test_bit(i, value_bitmap); |
5f424243 | 3167 | |
b17566a6 JK |
3168 | /* |
3169 | * Pins applicable for fast input but not for | |
3170 | * fast output processing may have been already | |
3171 | * inverted inside the fast path, skip them. | |
3172 | */ | |
3173 | if (!raw && !(array_info && | |
3174 | test_bit(i, array_info->invert_mask)) && | |
3175 | test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
5f424243 RI |
3176 | value = !value; |
3177 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
3178 | /* | |
3179 | * collect all normal outputs belonging to the same chip | |
3180 | * open drain and open source outputs are set individually | |
3181 | */ | |
02e47980 | 3182 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) { |
fac9d885 | 3183 | gpio_set_open_drain_value_commit(desc, value); |
02e47980 | 3184 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) { |
fac9d885 | 3185 | gpio_set_open_source_value_commit(desc, value); |
5f424243 RI |
3186 | } else { |
3187 | __set_bit(hwgpio, mask); | |
38e003f4 | 3188 | if (value) |
5f424243 | 3189 | __set_bit(hwgpio, bits); |
38e003f4 | 3190 | else |
5f424243 | 3191 | __clear_bit(hwgpio, bits); |
5f424243 RI |
3192 | count++; |
3193 | } | |
b17566a6 JK |
3194 | |
3195 | if (array_info) | |
35ae7f96 JK |
3196 | i = find_next_zero_bit(array_info->set_mask, |
3197 | array_size, i); | |
b17566a6 JK |
3198 | else |
3199 | i++; | |
fdeb8e15 LW |
3200 | } while ((i < array_size) && |
3201 | (desc_array[i]->gdev->chip == chip)); | |
5f424243 | 3202 | /* push collected bits to outputs */ |
38e003f4 | 3203 | if (count != 0) |
5f424243 | 3204 | gpio_chip_set_multiple(chip, mask, bits); |
3027743f LA |
3205 | |
3206 | if (mask != fastpath) | |
3207 | kfree(mask); | |
5f424243 | 3208 | } |
3027743f | 3209 | return 0; |
5f424243 RI |
3210 | } |
3211 | ||
d2876d08 | 3212 | /** |
79a9becd AC |
3213 | * gpiod_set_raw_value() - assign a gpio's raw value |
3214 | * @desc: gpio whose value will be assigned | |
d2876d08 | 3215 | * @value: value to assign |
d2876d08 | 3216 | * |
79a9becd AC |
3217 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
3218 | * regard for its ACTIVE_LOW status. | |
3219 | * | |
3220 | * This function should be called from contexts where we cannot sleep, and will | |
3221 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 3222 | */ |
79a9becd | 3223 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 3224 | { |
fdeb8e15 | 3225 | VALIDATE_DESC_VOID(desc); |
1cfab8f8 | 3226 | /* Should be using gpiod_set_value_cansleep() */ |
fdeb8e15 | 3227 | WARN_ON(desc->gdev->chip->can_sleep); |
fac9d885 | 3228 | gpiod_set_raw_value_commit(desc, value); |
d2876d08 | 3229 | } |
79a9becd | 3230 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 | 3231 | |
1e77fc82 GU |
3232 | /** |
3233 | * gpiod_set_value_nocheck() - set a GPIO line value without checking | |
3234 | * @desc: the descriptor to set the value on | |
3235 | * @value: value to set | |
3236 | * | |
3237 | * This sets the value of a GPIO line backing a descriptor, applying | |
3238 | * different semantic quirks like active low and open drain/source | |
3239 | * handling. | |
3240 | */ | |
3241 | static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value) | |
3242 | { | |
3243 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
3244 | value = !value; | |
3245 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
3246 | gpio_set_open_drain_value_commit(desc, value); | |
3247 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
3248 | gpio_set_open_source_value_commit(desc, value); | |
3249 | else | |
3250 | gpiod_set_raw_value_commit(desc, value); | |
3251 | } | |
3252 | ||
d2876d08 | 3253 | /** |
79a9becd AC |
3254 | * gpiod_set_value() - assign a gpio's value |
3255 | * @desc: gpio whose value will be assigned | |
3256 | * @value: value to assign | |
3257 | * | |
02e47980 LW |
3258 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW, |
3259 | * OPEN_DRAIN and OPEN_SOURCE flags into account. | |
d2876d08 | 3260 | * |
79a9becd AC |
3261 | * This function should be called from contexts where we cannot sleep, and will |
3262 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 3263 | */ |
79a9becd | 3264 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 3265 | { |
fdeb8e15 | 3266 | VALIDATE_DESC_VOID(desc); |
fdeb8e15 | 3267 | WARN_ON(desc->gdev->chip->can_sleep); |
1e77fc82 | 3268 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3269 | } |
79a9becd | 3270 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 3271 | |
5f424243 | 3272 | /** |
3fff99bc | 3273 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
b9762beb | 3274 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3275 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3276 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3277 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3278 | * |
3279 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3280 | * without regard for their ACTIVE_LOW status. | |
3281 | * | |
3282 | * This function should be called from contexts where we cannot sleep, and will | |
3283 | * complain if the GPIO chip functions potentially sleep. | |
3284 | */ | |
3027743f | 3285 | int gpiod_set_raw_array_value(unsigned int array_size, |
b9762beb | 3286 | struct gpio_desc **desc_array, |
77588c14 | 3287 | struct gpio_array *array_info, |
b9762beb | 3288 | unsigned long *value_bitmap) |
5f424243 RI |
3289 | { |
3290 | if (!desc_array) | |
3027743f LA |
3291 | return -EINVAL; |
3292 | return gpiod_set_array_value_complex(true, false, array_size, | |
77588c14 | 3293 | desc_array, array_info, value_bitmap); |
5f424243 | 3294 | } |
3fff99bc | 3295 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
3296 | |
3297 | /** | |
3fff99bc | 3298 | * gpiod_set_array_value() - assign values to an array of GPIOs |
b9762beb | 3299 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3300 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3301 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3302 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3303 | * |
3304 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3305 | * into account. | |
3306 | * | |
3307 | * This function should be called from contexts where we cannot sleep, and will | |
3308 | * complain if the GPIO chip functions potentially sleep. | |
3309 | */ | |
3fff99bc | 3310 | void gpiod_set_array_value(unsigned int array_size, |
b9762beb | 3311 | struct gpio_desc **desc_array, |
77588c14 | 3312 | struct gpio_array *array_info, |
b9762beb | 3313 | unsigned long *value_bitmap) |
5f424243 RI |
3314 | { |
3315 | if (!desc_array) | |
3316 | return; | |
44c7288f | 3317 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
77588c14 | 3318 | array_info, value_bitmap); |
5f424243 | 3319 | } |
3fff99bc | 3320 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 3321 | |
d2876d08 | 3322 | /** |
79a9becd AC |
3323 | * gpiod_cansleep() - report whether gpio value access may sleep |
3324 | * @desc: gpio to check | |
d2876d08 | 3325 | * |
d2876d08 | 3326 | */ |
79a9becd | 3327 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 3328 | { |
fdeb8e15 LW |
3329 | VALIDATE_DESC(desc); |
3330 | return desc->gdev->chip->can_sleep; | |
d2876d08 | 3331 | } |
79a9becd | 3332 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 3333 | |
90b39402 LW |
3334 | /** |
3335 | * gpiod_set_consumer_name() - set the consumer name for the descriptor | |
3336 | * @desc: gpio to set the consumer name on | |
3337 | * @name: the new consumer name | |
3338 | */ | |
3339 | void gpiod_set_consumer_name(struct gpio_desc *desc, const char *name) | |
3340 | { | |
3341 | VALIDATE_DESC_VOID(desc); | |
3342 | /* Just overwrite whatever the previous name was */ | |
3343 | desc->label = name; | |
3344 | } | |
3345 | EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); | |
3346 | ||
0f6d504e | 3347 | /** |
79a9becd AC |
3348 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
3349 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 3350 | * |
79a9becd AC |
3351 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
3352 | * error. | |
0f6d504e | 3353 | */ |
79a9becd | 3354 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e | 3355 | { |
4c37ce86 LW |
3356 | struct gpio_chip *chip; |
3357 | int offset; | |
0f6d504e | 3358 | |
79bb71bd LW |
3359 | /* |
3360 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics | |
3361 | * requires this function to not return zero on an invalid descriptor | |
3362 | * but rather a negative error number. | |
3363 | */ | |
bfbbe44d | 3364 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
79bb71bd LW |
3365 | return -EINVAL; |
3366 | ||
fdeb8e15 | 3367 | chip = desc->gdev->chip; |
372e722e | 3368 | offset = gpio_chip_hwgpio(desc); |
4c37ce86 LW |
3369 | if (chip->to_irq) { |
3370 | int retirq = chip->to_irq(chip, offset); | |
3371 | ||
3372 | /* Zero means NO_IRQ */ | |
3373 | if (!retirq) | |
3374 | return -ENXIO; | |
3375 | ||
3376 | return retirq; | |
3377 | } | |
3378 | return -ENXIO; | |
0f6d504e | 3379 | } |
79a9becd | 3380 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 3381 | |
d468bf9e | 3382 | /** |
e3a2e878 | 3383 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
3384 | * @chip: the chip the GPIO to lock belongs to |
3385 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3386 | * |
3387 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 3388 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 3389 | */ |
e3a2e878 | 3390 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 3391 | { |
9c10280d LW |
3392 | struct gpio_desc *desc; |
3393 | ||
3394 | desc = gpiochip_get_desc(chip, offset); | |
3395 | if (IS_ERR(desc)) | |
3396 | return PTR_ERR(desc); | |
3397 | ||
60f8339e LW |
3398 | /* |
3399 | * If it's fast: flush the direction setting if something changed | |
3400 | * behind our back | |
3401 | */ | |
3402 | if (!chip->can_sleep && chip->get_direction) { | |
80956790 | 3403 | int dir = gpiod_get_direction(desc); |
9c10280d | 3404 | |
36b31279 AS |
3405 | if (dir < 0) { |
3406 | chip_err(chip, "%s: cannot get GPIO direction\n", | |
3407 | __func__); | |
3408 | return dir; | |
3409 | } | |
9c10280d | 3410 | } |
d468bf9e | 3411 | |
9c10280d | 3412 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
d74be6df | 3413 | chip_err(chip, |
b1911710 AS |
3414 | "%s: tried to flag a GPIO set as output for IRQ\n", |
3415 | __func__); | |
d468bf9e LW |
3416 | return -EIO; |
3417 | } | |
3418 | ||
9c10280d | 3419 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
4e9439dd | 3420 | set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
3940c34a LW |
3421 | |
3422 | /* | |
3423 | * If the consumer has not set up a label (such as when the | |
3424 | * IRQ is referenced from .to_irq()) we set up a label here | |
3425 | * so it is clear this is used as an interrupt. | |
3426 | */ | |
3427 | if (!desc->label) | |
3428 | desc_set_label(desc, "interrupt"); | |
3429 | ||
d468bf9e | 3430 | return 0; |
372e722e | 3431 | } |
e3a2e878 | 3432 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 3433 | |
d468bf9e | 3434 | /** |
e3a2e878 | 3435 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
3436 | * @chip: the chip the GPIO to lock belongs to |
3437 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
3438 | * |
3439 | * This is used directly by GPIO drivers that want to indicate | |
3440 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 3441 | */ |
e3a2e878 | 3442 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 3443 | { |
3940c34a LW |
3444 | struct gpio_desc *desc; |
3445 | ||
3446 | desc = gpiochip_get_desc(chip, offset); | |
3447 | if (IS_ERR(desc)) | |
d468bf9e | 3448 | return; |
d2876d08 | 3449 | |
3940c34a | 3450 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
4e9439dd | 3451 | clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
3940c34a LW |
3452 | |
3453 | /* If we only had this marking, erase it */ | |
3454 | if (desc->label && !strcmp(desc->label, "interrupt")) | |
3455 | desc_set_label(desc, NULL); | |
d468bf9e | 3456 | } |
e3a2e878 | 3457 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 3458 | |
4e9439dd HV |
3459 | void gpiochip_disable_irq(struct gpio_chip *chip, unsigned int offset) |
3460 | { | |
3461 | struct gpio_desc *desc = gpiochip_get_desc(chip, offset); | |
3462 | ||
3463 | if (!IS_ERR(desc) && | |
3464 | !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) | |
3465 | clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); | |
3466 | } | |
3467 | EXPORT_SYMBOL_GPL(gpiochip_disable_irq); | |
3468 | ||
3469 | void gpiochip_enable_irq(struct gpio_chip *chip, unsigned int offset) | |
3470 | { | |
3471 | struct gpio_desc *desc = gpiochip_get_desc(chip, offset); | |
3472 | ||
3473 | if (!IS_ERR(desc) && | |
3474 | !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) { | |
3475 | WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags)); | |
3476 | set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); | |
3477 | } | |
3478 | } | |
3479 | EXPORT_SYMBOL_GPL(gpiochip_enable_irq); | |
3480 | ||
6cee3821 LW |
3481 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
3482 | { | |
3483 | if (offset >= chip->ngpio) | |
3484 | return false; | |
3485 | ||
3486 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); | |
3487 | } | |
3488 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); | |
3489 | ||
4e6b8238 HV |
3490 | int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset) |
3491 | { | |
3492 | int ret; | |
3493 | ||
3494 | if (!try_module_get(chip->gpiodev->owner)) | |
3495 | return -ENODEV; | |
3496 | ||
3497 | ret = gpiochip_lock_as_irq(chip, offset); | |
3498 | if (ret) { | |
3499 | chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset); | |
3500 | module_put(chip->gpiodev->owner); | |
3501 | return ret; | |
3502 | } | |
3503 | return 0; | |
3504 | } | |
3505 | EXPORT_SYMBOL_GPL(gpiochip_reqres_irq); | |
3506 | ||
3507 | void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset) | |
3508 | { | |
3509 | gpiochip_unlock_as_irq(chip, offset); | |
3510 | module_put(chip->gpiodev->owner); | |
3511 | } | |
3512 | EXPORT_SYMBOL_GPL(gpiochip_relres_irq); | |
3513 | ||
143b65d6 LW |
3514 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
3515 | { | |
3516 | if (offset >= chip->ngpio) | |
3517 | return false; | |
3518 | ||
3519 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); | |
3520 | } | |
3521 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); | |
3522 | ||
3523 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) | |
3524 | { | |
3525 | if (offset >= chip->ngpio) | |
3526 | return false; | |
3527 | ||
3528 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); | |
3529 | } | |
3530 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); | |
3531 | ||
05f479bf CK |
3532 | bool gpiochip_line_is_persistent(struct gpio_chip *chip, unsigned int offset) |
3533 | { | |
3534 | if (offset >= chip->ngpio) | |
3535 | return false; | |
3536 | ||
e10f72bf | 3537 | return !test_bit(FLAG_TRANSITORY, &chip->gpiodev->descs[offset].flags); |
05f479bf CK |
3538 | } |
3539 | EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); | |
3540 | ||
79a9becd AC |
3541 | /** |
3542 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
3543 | * @desc: gpio whose value will be returned | |
3544 | * | |
3545 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 3546 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
3547 | * |
3548 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 3549 | */ |
79a9becd | 3550 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 3551 | { |
d2876d08 | 3552 | might_sleep_if(extra_checks); |
fdeb8e15 | 3553 | VALIDATE_DESC(desc); |
fac9d885 | 3554 | return gpiod_get_raw_value_commit(desc); |
d2876d08 | 3555 | } |
79a9becd | 3556 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 3557 | |
79a9becd AC |
3558 | /** |
3559 | * gpiod_get_value_cansleep() - return a gpio's value | |
3560 | * @desc: gpio whose value will be returned | |
3561 | * | |
3562 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 3563 | * account, or negative errno on failure. |
79a9becd AC |
3564 | * |
3565 | * This function is to be called from contexts that can sleep. | |
3566 | */ | |
3567 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 3568 | { |
3f397c21 | 3569 | int value; |
d2876d08 DB |
3570 | |
3571 | might_sleep_if(extra_checks); | |
fdeb8e15 | 3572 | VALIDATE_DESC(desc); |
fac9d885 | 3573 | value = gpiod_get_raw_value_commit(desc); |
e20538b8 BA |
3574 | if (value < 0) |
3575 | return value; | |
3576 | ||
79a9becd AC |
3577 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
3578 | value = !value; | |
3579 | ||
3f397c21 | 3580 | return value; |
d2876d08 | 3581 | } |
79a9becd | 3582 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 3583 | |
eec1d566 LW |
3584 | /** |
3585 | * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs | |
b9762beb | 3586 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3587 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3588 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3589 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3590 | * |
3591 | * Read the raw values of the GPIOs, i.e. the values of the physical lines | |
3592 | * without regard for their ACTIVE_LOW status. Return 0 in case of success, | |
3593 | * else an error code. | |
3594 | * | |
3595 | * This function is to be called from contexts that can sleep. | |
3596 | */ | |
3597 | int gpiod_get_raw_array_value_cansleep(unsigned int array_size, | |
3598 | struct gpio_desc **desc_array, | |
77588c14 | 3599 | struct gpio_array *array_info, |
b9762beb | 3600 | unsigned long *value_bitmap) |
eec1d566 LW |
3601 | { |
3602 | might_sleep_if(extra_checks); | |
3603 | if (!desc_array) | |
3604 | return -EINVAL; | |
3605 | return gpiod_get_array_value_complex(true, true, array_size, | |
77588c14 JK |
3606 | desc_array, array_info, |
3607 | value_bitmap); | |
eec1d566 LW |
3608 | } |
3609 | EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep); | |
3610 | ||
3611 | /** | |
3612 | * gpiod_get_array_value_cansleep() - read values from an array of GPIOs | |
b9762beb | 3613 | * @array_size: number of elements in the descriptor array / value bitmap |
eec1d566 | 3614 | * @desc_array: array of GPIO descriptors whose values will be read |
77588c14 | 3615 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3616 | * @value_bitmap: bitmap to store the read values |
eec1d566 LW |
3617 | * |
3618 | * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3619 | * into account. Return 0 in case of success, else an error code. | |
3620 | * | |
3621 | * This function is to be called from contexts that can sleep. | |
3622 | */ | |
3623 | int gpiod_get_array_value_cansleep(unsigned int array_size, | |
3624 | struct gpio_desc **desc_array, | |
77588c14 | 3625 | struct gpio_array *array_info, |
b9762beb | 3626 | unsigned long *value_bitmap) |
eec1d566 LW |
3627 | { |
3628 | might_sleep_if(extra_checks); | |
3629 | if (!desc_array) | |
3630 | return -EINVAL; | |
3631 | return gpiod_get_array_value_complex(false, true, array_size, | |
77588c14 JK |
3632 | desc_array, array_info, |
3633 | value_bitmap); | |
eec1d566 LW |
3634 | } |
3635 | EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep); | |
3636 | ||
79a9becd AC |
3637 | /** |
3638 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
3639 | * @desc: gpio whose value will be assigned | |
3640 | * @value: value to assign | |
3641 | * | |
3642 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
3643 | * regard for its ACTIVE_LOW status. | |
3644 | * | |
3645 | * This function is to be called from contexts that can sleep. | |
3646 | */ | |
3647 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 3648 | { |
d2876d08 | 3649 | might_sleep_if(extra_checks); |
fdeb8e15 | 3650 | VALIDATE_DESC_VOID(desc); |
fac9d885 | 3651 | gpiod_set_raw_value_commit(desc, value); |
372e722e | 3652 | } |
79a9becd | 3653 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 3654 | |
79a9becd AC |
3655 | /** |
3656 | * gpiod_set_value_cansleep() - assign a gpio's value | |
3657 | * @desc: gpio whose value will be assigned | |
3658 | * @value: value to assign | |
3659 | * | |
3660 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
3661 | * account | |
3662 | * | |
3663 | * This function is to be called from contexts that can sleep. | |
3664 | */ | |
3665 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 3666 | { |
d2876d08 | 3667 | might_sleep_if(extra_checks); |
fdeb8e15 | 3668 | VALIDATE_DESC_VOID(desc); |
1e77fc82 | 3669 | gpiod_set_value_nocheck(desc, value); |
372e722e | 3670 | } |
79a9becd | 3671 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 3672 | |
5f424243 | 3673 | /** |
3fff99bc | 3674 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
b9762beb | 3675 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3676 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3677 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3678 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3679 | * |
3680 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
3681 | * without regard for their ACTIVE_LOW status. | |
3682 | * | |
3683 | * This function is to be called from contexts that can sleep. | |
3684 | */ | |
3027743f | 3685 | int gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
3fff99bc | 3686 | struct gpio_desc **desc_array, |
77588c14 | 3687 | struct gpio_array *array_info, |
b9762beb | 3688 | unsigned long *value_bitmap) |
5f424243 RI |
3689 | { |
3690 | might_sleep_if(extra_checks); | |
3691 | if (!desc_array) | |
3027743f LA |
3692 | return -EINVAL; |
3693 | return gpiod_set_array_value_complex(true, true, array_size, desc_array, | |
77588c14 | 3694 | array_info, value_bitmap); |
5f424243 | 3695 | } |
3fff99bc | 3696 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 | 3697 | |
3946d187 DT |
3698 | /** |
3699 | * gpiod_add_lookup_tables() - register GPIO device consumers | |
3700 | * @tables: list of tables of consumers to register | |
3701 | * @n: number of tables in the list | |
3702 | */ | |
3703 | void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) | |
3704 | { | |
3705 | unsigned int i; | |
3706 | ||
3707 | mutex_lock(&gpio_lookup_lock); | |
3708 | ||
3709 | for (i = 0; i < n; i++) | |
3710 | list_add_tail(&tables[i]->list, &gpio_lookup_list); | |
3711 | ||
3712 | mutex_unlock(&gpio_lookup_lock); | |
3713 | } | |
3714 | ||
5f424243 | 3715 | /** |
3fff99bc | 3716 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
b9762beb | 3717 | * @array_size: number of elements in the descriptor array / value bitmap |
5f424243 | 3718 | * @desc_array: array of GPIO descriptors whose values will be assigned |
77588c14 | 3719 | * @array_info: information on applicability of fast bitmap processing path |
b9762beb | 3720 | * @value_bitmap: bitmap of values to assign |
5f424243 RI |
3721 | * |
3722 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
3723 | * into account. | |
3724 | * | |
3725 | * This function is to be called from contexts that can sleep. | |
3726 | */ | |
3fff99bc RI |
3727 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
3728 | struct gpio_desc **desc_array, | |
77588c14 | 3729 | struct gpio_array *array_info, |
b9762beb | 3730 | unsigned long *value_bitmap) |
5f424243 RI |
3731 | { |
3732 | might_sleep_if(extra_checks); | |
3733 | if (!desc_array) | |
3734 | return; | |
44c7288f | 3735 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
77588c14 | 3736 | array_info, value_bitmap); |
5f424243 | 3737 | } |
3fff99bc | 3738 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 3739 | |
bae48da2 | 3740 | /** |
ad824783 AC |
3741 | * gpiod_add_lookup_table() - register GPIO device consumers |
3742 | * @table: table of consumers to register | |
bae48da2 | 3743 | */ |
ad824783 | 3744 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
3745 | { |
3746 | mutex_lock(&gpio_lookup_lock); | |
3747 | ||
ad824783 | 3748 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
3749 | |
3750 | mutex_unlock(&gpio_lookup_lock); | |
3751 | } | |
226b2242 | 3752 | EXPORT_SYMBOL_GPL(gpiod_add_lookup_table); |
bae48da2 | 3753 | |
be9015ab SK |
3754 | /** |
3755 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
3756 | * @table: table of consumers to unregister | |
3757 | */ | |
3758 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
3759 | { | |
3760 | mutex_lock(&gpio_lookup_lock); | |
3761 | ||
3762 | list_del(&table->list); | |
3763 | ||
3764 | mutex_unlock(&gpio_lookup_lock); | |
3765 | } | |
226b2242 | 3766 | EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); |
be9015ab | 3767 | |
a411e81e BG |
3768 | /** |
3769 | * gpiod_add_hogs() - register a set of GPIO hogs from machine code | |
3770 | * @hogs: table of gpio hog entries with a zeroed sentinel at the end | |
3771 | */ | |
3772 | void gpiod_add_hogs(struct gpiod_hog *hogs) | |
3773 | { | |
3774 | struct gpio_chip *chip; | |
3775 | struct gpiod_hog *hog; | |
3776 | ||
3777 | mutex_lock(&gpio_machine_hogs_mutex); | |
3778 | ||
3779 | for (hog = &hogs[0]; hog->chip_label; hog++) { | |
3780 | list_add_tail(&hog->list, &gpio_machine_hogs); | |
3781 | ||
3782 | /* | |
3783 | * The chip may have been registered earlier, so check if it | |
3784 | * exists and, if so, try to hog the line now. | |
3785 | */ | |
3786 | chip = find_chip_by_name(hog->chip_label); | |
3787 | if (chip) | |
3788 | gpiochip_machine_hog(chip, hog); | |
3789 | } | |
3790 | ||
3791 | mutex_unlock(&gpio_machine_hogs_mutex); | |
3792 | } | |
3793 | EXPORT_SYMBOL_GPL(gpiod_add_hogs); | |
3794 | ||
ad824783 | 3795 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
3796 | { |
3797 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 3798 | struct gpiod_lookup_table *table; |
bae48da2 AC |
3799 | |
3800 | mutex_lock(&gpio_lookup_lock); | |
3801 | ||
ad824783 AC |
3802 | list_for_each_entry(table, &gpio_lookup_list, list) { |
3803 | if (table->dev_id && dev_id) { | |
3804 | /* | |
3805 | * Valid strings on both ends, must be identical to have | |
3806 | * a match | |
3807 | */ | |
3808 | if (!strcmp(table->dev_id, dev_id)) | |
3809 | goto found; | |
3810 | } else { | |
3811 | /* | |
3812 | * One of the pointers is NULL, so both must be to have | |
3813 | * a match | |
3814 | */ | |
3815 | if (dev_id == table->dev_id) | |
3816 | goto found; | |
3817 | } | |
3818 | } | |
3819 | table = NULL; | |
bae48da2 | 3820 | |
ad824783 AC |
3821 | found: |
3822 | mutex_unlock(&gpio_lookup_lock); | |
3823 | return table; | |
3824 | } | |
bae48da2 | 3825 | |
ad824783 AC |
3826 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
3827 | unsigned int idx, | |
3828 | enum gpio_lookup_flags *flags) | |
3829 | { | |
2a3cf6a3 | 3830 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
3831 | struct gpiod_lookup_table *table; |
3832 | struct gpiod_lookup *p; | |
bae48da2 | 3833 | |
ad824783 AC |
3834 | table = gpiod_find_lookup_table(dev); |
3835 | if (!table) | |
3836 | return desc; | |
bae48da2 | 3837 | |
ad824783 AC |
3838 | for (p = &table->table[0]; p->chip_label; p++) { |
3839 | struct gpio_chip *chip; | |
bae48da2 | 3840 | |
ad824783 | 3841 | /* idx must always match exactly */ |
bae48da2 AC |
3842 | if (p->idx != idx) |
3843 | continue; | |
3844 | ||
ad824783 AC |
3845 | /* If the lookup entry has a con_id, require exact match */ |
3846 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
3847 | continue; | |
bae48da2 | 3848 | |
ad824783 | 3849 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 3850 | |
ad824783 | 3851 | if (!chip) { |
8853daf3 JK |
3852 | /* |
3853 | * As the lookup table indicates a chip with | |
3854 | * p->chip_label should exist, assume it may | |
3855 | * still appear later and let the interested | |
3856 | * consumer be probed again or let the Deferred | |
3857 | * Probe infrastructure handle the error. | |
3858 | */ | |
3859 | dev_warn(dev, "cannot find GPIO chip %s, deferring\n", | |
3860 | p->chip_label); | |
3861 | return ERR_PTR(-EPROBE_DEFER); | |
ad824783 | 3862 | } |
bae48da2 | 3863 | |
ad824783 | 3864 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
3865 | dev_err(dev, |
3866 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
3867 | idx, chip->ngpio, chip->label); | |
3868 | return ERR_PTR(-EINVAL); | |
bae48da2 | 3869 | } |
bae48da2 | 3870 | |
bb1e88cc | 3871 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 3872 | *flags = p->flags; |
bae48da2 | 3873 | |
2a3cf6a3 | 3874 | return desc; |
bae48da2 AC |
3875 | } |
3876 | ||
bae48da2 AC |
3877 | return desc; |
3878 | } | |
3879 | ||
66858527 RI |
3880 | static int dt_gpio_count(struct device *dev, const char *con_id) |
3881 | { | |
3882 | int ret; | |
3883 | char propname[32]; | |
3884 | unsigned int i; | |
3885 | ||
3886 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
3887 | if (con_id) | |
3888 | snprintf(propname, sizeof(propname), "%s-%s", | |
3889 | con_id, gpio_suffixes[i]); | |
3890 | else | |
3891 | snprintf(propname, sizeof(propname), "%s", | |
3892 | gpio_suffixes[i]); | |
3893 | ||
3894 | ret = of_gpio_named_count(dev->of_node, propname); | |
4033d4a4 | 3895 | if (ret > 0) |
66858527 RI |
3896 | break; |
3897 | } | |
4033d4a4 | 3898 | return ret ? ret : -ENOENT; |
66858527 RI |
3899 | } |
3900 | ||
3901 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
3902 | { | |
3903 | struct gpiod_lookup_table *table; | |
3904 | struct gpiod_lookup *p; | |
3905 | unsigned int count = 0; | |
3906 | ||
3907 | table = gpiod_find_lookup_table(dev); | |
3908 | if (!table) | |
3909 | return -ENOENT; | |
3910 | ||
3911 | for (p = &table->table[0]; p->chip_label; p++) { | |
3912 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
3913 | (!con_id && !p->con_id)) | |
3914 | count++; | |
3915 | } | |
3916 | if (!count) | |
3917 | return -ENOENT; | |
3918 | ||
3919 | return count; | |
3920 | } | |
3921 | ||
3922 | /** | |
3923 | * gpiod_count - return the number of GPIOs associated with a device / function | |
3924 | * or -ENOENT if no GPIO has been assigned to the requested function | |
3925 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3926 | * @con_id: function within the GPIO consumer | |
3927 | */ | |
3928 | int gpiod_count(struct device *dev, const char *con_id) | |
3929 | { | |
3930 | int count = -ENOENT; | |
3931 | ||
3932 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
3933 | count = dt_gpio_count(dev, con_id); | |
3934 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
3935 | count = acpi_gpio_count(dev, con_id); | |
3936 | ||
3937 | if (count < 0) | |
3938 | count = platform_gpio_count(dev, con_id); | |
3939 | ||
3940 | return count; | |
3941 | } | |
3942 | EXPORT_SYMBOL_GPL(gpiod_count); | |
3943 | ||
bae48da2 | 3944 | /** |
0879162f | 3945 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 3946 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 3947 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 3948 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
3949 | * |
3950 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 3951 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 3952 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 3953 | */ |
b17d1bf1 | 3954 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 3955 | enum gpiod_flags flags) |
bae48da2 | 3956 | { |
39b2bbe3 | 3957 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 3958 | } |
b17d1bf1 | 3959 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 3960 | |
29a1f233 TR |
3961 | /** |
3962 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
3963 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
3964 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 3965 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
3966 | * |
3967 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
3968 | * the requested function it will return NULL. This is convenient for drivers | |
3969 | * that need to handle optional GPIOs. | |
3970 | */ | |
b17d1bf1 | 3971 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
3972 | const char *con_id, |
3973 | enum gpiod_flags flags) | |
29a1f233 | 3974 | { |
39b2bbe3 | 3975 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 3976 | } |
b17d1bf1 | 3977 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 3978 | |
f625d460 BP |
3979 | |
3980 | /** | |
3981 | * gpiod_configure_flags - helper function to configure a given GPIO | |
3982 | * @desc: gpio whose value will be assigned | |
3983 | * @con_id: function within the GPIO consumer | |
85b03b30 JH |
3984 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
3985 | * of_get_gpio_hog() | |
f625d460 BP |
3986 | * @dflags: gpiod_flags - optional GPIO initialization flags |
3987 | * | |
3988 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
3989 | * requested function and/or index, or another IS_ERR() code if an error | |
3990 | * occurred while trying to acquire the GPIO. | |
3991 | */ | |
c29fd9eb | 3992 | int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
85b03b30 | 3993 | unsigned long lflags, enum gpiod_flags dflags) |
f625d460 BP |
3994 | { |
3995 | int status; | |
3996 | ||
85b03b30 JH |
3997 | if (lflags & GPIO_ACTIVE_LOW) |
3998 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
f926dfc1 | 3999 | |
85b03b30 JH |
4000 | if (lflags & GPIO_OPEN_DRAIN) |
4001 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
f926dfc1 LW |
4002 | else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) { |
4003 | /* | |
4004 | * This enforces open drain mode from the consumer side. | |
4005 | * This is necessary for some busses like I2C, but the lookup | |
4006 | * should *REALLY* have specified them as open drain in the | |
4007 | * first place, so print a little warning here. | |
4008 | */ | |
4009 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
4010 | gpiod_warn(desc, | |
4011 | "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n"); | |
4012 | } | |
4013 | ||
85b03b30 JH |
4014 | if (lflags & GPIO_OPEN_SOURCE) |
4015 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
e10f72bf AJ |
4016 | |
4017 | status = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY)); | |
4018 | if (status < 0) | |
4019 | return status; | |
85b03b30 | 4020 | |
f625d460 BP |
4021 | /* No particular flag request, return here... */ |
4022 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
4023 | pr_debug("no flags found for %s\n", con_id); | |
4024 | return 0; | |
4025 | } | |
4026 | ||
4027 | /* Process flags */ | |
4028 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
4029 | status = gpiod_direction_output(desc, | |
ad17731d | 4030 | !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
f625d460 BP |
4031 | else |
4032 | status = gpiod_direction_input(desc); | |
4033 | ||
4034 | return status; | |
4035 | } | |
4036 | ||
bae48da2 AC |
4037 | /** |
4038 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 4039 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
4040 | * @con_id: function within the GPIO consumer |
4041 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 4042 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
4043 | * |
4044 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
4045 | * defined one for functions that define several GPIOs. | |
4046 | * | |
2a3cf6a3 AC |
4047 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
4048 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 4049 | * occurred while trying to acquire the GPIO. |
bae48da2 | 4050 | */ |
b17d1bf1 | 4051 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 4052 | const char *con_id, |
39b2bbe3 AC |
4053 | unsigned int idx, |
4054 | enum gpiod_flags flags) | |
bae48da2 | 4055 | { |
35c5d7fd | 4056 | struct gpio_desc *desc = NULL; |
bae48da2 | 4057 | int status; |
39b2bbe3 | 4058 | enum gpio_lookup_flags lookupflags = 0; |
7d18f0a1 LW |
4059 | /* Maybe we have a device name, maybe not */ |
4060 | const char *devname = dev ? dev_name(dev) : "?"; | |
bae48da2 AC |
4061 | |
4062 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
4063 | ||
4d8440b9 RW |
4064 | if (dev) { |
4065 | /* Using device tree? */ | |
4066 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
4067 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
4068 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
4069 | } else if (ACPI_COMPANION(dev)) { | |
4070 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
a31f5c3a | 4071 | desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); |
4d8440b9 | 4072 | } |
35c5d7fd AC |
4073 | } |
4074 | ||
4075 | /* | |
4076 | * Either we are not using DT or ACPI, or their lookup did not return | |
4077 | * a result. In that case, use platform lookup as a fallback. | |
4078 | */ | |
2a3cf6a3 | 4079 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 4080 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 4081 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
4082 | } |
4083 | ||
4084 | if (IS_ERR(desc)) { | |
9d5a1f2c | 4085 | dev_dbg(dev, "No GPIO consumer %s found\n", con_id); |
bae48da2 AC |
4086 | return desc; |
4087 | } | |
4088 | ||
7d18f0a1 LW |
4089 | /* |
4090 | * If a connection label was passed use that, else attempt to use | |
4091 | * the device name as label | |
4092 | */ | |
4093 | status = gpiod_request(desc, con_id ? con_id : devname); | |
bae48da2 AC |
4094 | if (status < 0) |
4095 | return ERR_PTR(status); | |
4096 | ||
85b03b30 | 4097 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
4098 | if (status < 0) { |
4099 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
4100 | gpiod_put(desc); | |
4101 | return ERR_PTR(status); | |
4102 | } | |
4103 | ||
bae48da2 AC |
4104 | return desc; |
4105 | } | |
b17d1bf1 | 4106 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 4107 | |
6392cca4 LW |
4108 | /** |
4109 | * gpiod_get_from_of_node() - obtain a GPIO from an OF node | |
4110 | * @node: handle of the OF node | |
4111 | * @propname: name of the DT property representing the GPIO | |
4112 | * @index: index of the GPIO to obtain for the consumer | |
4113 | * @dflags: GPIO initialization flags | |
4114 | * @label: label to attach to the requested GPIO | |
4115 | * | |
4116 | * Returns: | |
4117 | * On successful request the GPIO pin is configured in accordance with | |
4118 | * provided @dflags. If the node does not have the requested GPIO | |
4119 | * property, NULL is returned. | |
4120 | * | |
4121 | * In case of error an ERR_PTR() is returned. | |
4122 | */ | |
92542edc LW |
4123 | struct gpio_desc *gpiod_get_from_of_node(struct device_node *node, |
4124 | const char *propname, int index, | |
4125 | enum gpiod_flags dflags, | |
4126 | const char *label) | |
6392cca4 | 4127 | { |
40a3c9db | 4128 | struct gpio_desc *desc; |
6392cca4 LW |
4129 | unsigned long lflags = 0; |
4130 | enum of_gpio_flags flags; | |
4131 | bool active_low = false; | |
4132 | bool single_ended = false; | |
4133 | bool open_drain = false; | |
4134 | bool transitory = false; | |
4135 | int ret; | |
4136 | ||
4137 | desc = of_get_named_gpiod_flags(node, propname, | |
4138 | index, &flags); | |
4139 | ||
4140 | if (!desc || IS_ERR(desc)) { | |
4141 | /* If it is not there, just return NULL */ | |
4142 | if (PTR_ERR(desc) == -ENOENT) | |
4143 | return NULL; | |
4144 | return desc; | |
4145 | } | |
4146 | ||
4147 | active_low = flags & OF_GPIO_ACTIVE_LOW; | |
4148 | single_ended = flags & OF_GPIO_SINGLE_ENDED; | |
4149 | open_drain = flags & OF_GPIO_OPEN_DRAIN; | |
4150 | transitory = flags & OF_GPIO_TRANSITORY; | |
4151 | ||
4152 | ret = gpiod_request(desc, label); | |
4153 | if (ret) | |
4154 | return ERR_PTR(ret); | |
4155 | ||
4156 | if (active_low) | |
4157 | lflags |= GPIO_ACTIVE_LOW; | |
4158 | ||
4159 | if (single_ended) { | |
4160 | if (open_drain) | |
4161 | lflags |= GPIO_OPEN_DRAIN; | |
4162 | else | |
4163 | lflags |= GPIO_OPEN_SOURCE; | |
4164 | } | |
4165 | ||
4166 | if (transitory) | |
4167 | lflags |= GPIO_TRANSITORY; | |
4168 | ||
4169 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); | |
4170 | if (ret < 0) { | |
4171 | gpiod_put(desc); | |
4172 | return ERR_PTR(ret); | |
4173 | } | |
4174 | ||
4175 | return desc; | |
4176 | } | |
92542edc | 4177 | EXPORT_SYMBOL(gpiod_get_from_of_node); |
6392cca4 | 4178 | |
40b73183 MW |
4179 | /** |
4180 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
4181 | * @fwnode: handle of the firmware node | |
4182 | * @propname: name of the firmware property representing the GPIO | |
6392cca4 | 4183 | * @index: index of the GPIO to obtain for the consumer |
a264d10f | 4184 | * @dflags: GPIO initialization flags |
950d55f5 | 4185 | * @label: label to attach to the requested GPIO |
40b73183 MW |
4186 | * |
4187 | * This function can be used for drivers that get their configuration | |
6392cca4 | 4188 | * from opaque firmware. |
40b73183 | 4189 | * |
6392cca4 | 4190 | * The function properly finds the corresponding GPIO using whatever is the |
40b73183 MW |
4191 | * underlying firmware interface and then makes sure that the GPIO |
4192 | * descriptor is requested before it is returned to the caller. | |
4193 | * | |
950d55f5 | 4194 | * Returns: |
ff21378a | 4195 | * On successful request the GPIO pin is configured in accordance with |
a264d10f AS |
4196 | * provided @dflags. |
4197 | * | |
40b73183 MW |
4198 | * In case of error an ERR_PTR() is returned. |
4199 | */ | |
4200 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
537b94da | 4201 | const char *propname, int index, |
b2987d74 AS |
4202 | enum gpiod_flags dflags, |
4203 | const char *label) | |
40b73183 MW |
4204 | { |
4205 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
a264d10f | 4206 | unsigned long lflags = 0; |
40b73183 MW |
4207 | int ret; |
4208 | ||
4209 | if (!fwnode) | |
4210 | return ERR_PTR(-EINVAL); | |
4211 | ||
4212 | if (is_of_node(fwnode)) { | |
6392cca4 LW |
4213 | desc = gpiod_get_from_of_node(to_of_node(fwnode), |
4214 | propname, index, | |
4215 | dflags, | |
4216 | label); | |
4217 | return desc; | |
40b73183 MW |
4218 | } else if (is_acpi_node(fwnode)) { |
4219 | struct acpi_gpio_info info; | |
4220 | ||
537b94da | 4221 | desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
6392cca4 LW |
4222 | if (IS_ERR(desc)) |
4223 | return desc; | |
40b73183 | 4224 | |
6392cca4 | 4225 | acpi_gpio_update_gpiod_flags(&dflags, &info); |
40b73183 | 4226 | |
6392cca4 LW |
4227 | if (info.polarity == GPIO_ACTIVE_LOW) |
4228 | lflags |= GPIO_ACTIVE_LOW; | |
4229 | } | |
40b73183 | 4230 | |
6392cca4 | 4231 | /* Currently only ACPI takes this path */ |
b2987d74 | 4232 | ret = gpiod_request(desc, label); |
85b03b30 JH |
4233 | if (ret) |
4234 | return ERR_PTR(ret); | |
4235 | ||
a264d10f AS |
4236 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
4237 | if (ret < 0) { | |
4238 | gpiod_put(desc); | |
4239 | return ERR_PTR(ret); | |
90b665f6 LP |
4240 | } |
4241 | ||
40b73183 MW |
4242 | return desc; |
4243 | } | |
4244 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
4245 | ||
29a1f233 TR |
4246 | /** |
4247 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
4248 | * function | |
4249 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4250 | * @con_id: function within the GPIO consumer | |
4251 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 4252 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
4253 | * |
4254 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
4255 | * specified index was assigned to the requested function it will return NULL. | |
4256 | * This is convenient for drivers that need to handle optional GPIOs. | |
4257 | */ | |
b17d1bf1 | 4258 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 4259 | const char *con_id, |
39b2bbe3 AC |
4260 | unsigned int index, |
4261 | enum gpiod_flags flags) | |
29a1f233 TR |
4262 | { |
4263 | struct gpio_desc *desc; | |
4264 | ||
39b2bbe3 | 4265 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
4266 | if (IS_ERR(desc)) { |
4267 | if (PTR_ERR(desc) == -ENOENT) | |
4268 | return NULL; | |
4269 | } | |
4270 | ||
4271 | return desc; | |
4272 | } | |
b17d1bf1 | 4273 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 4274 | |
f625d460 BP |
4275 | /** |
4276 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
4277 | * @desc: gpio whose value will be assigned | |
4278 | * @name: gpio line name | |
4279 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
4280 | * of_get_gpio_hog() | |
4281 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
4282 | */ | |
4283 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
4284 | unsigned long lflags, enum gpiod_flags dflags) | |
4285 | { | |
4286 | struct gpio_chip *chip; | |
4287 | struct gpio_desc *local_desc; | |
4288 | int hwnum; | |
4289 | int status; | |
4290 | ||
4291 | chip = gpiod_to_chip(desc); | |
4292 | hwnum = gpio_chip_hwgpio(desc); | |
4293 | ||
4294 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
4295 | if (IS_ERR(local_desc)) { | |
c31a571d LD |
4296 | status = PTR_ERR(local_desc); |
4297 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", | |
4298 | name, chip->label, hwnum, status); | |
4299 | return status; | |
f625d460 BP |
4300 | } |
4301 | ||
85b03b30 | 4302 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
f625d460 | 4303 | if (status < 0) { |
c31a571d LD |
4304 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
4305 | name, chip->label, hwnum, status); | |
f625d460 BP |
4306 | gpiochip_free_own_desc(desc); |
4307 | return status; | |
4308 | } | |
4309 | ||
4310 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
4311 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
4312 | ||
4313 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
4314 | desc_to_gpio(desc), name, | |
4315 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
4316 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
4317 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
4318 | ||
4319 | return 0; | |
4320 | } | |
4321 | ||
4322 | /** | |
4323 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
4324 | * @chip: gpio chip to act on | |
4325 | * | |
4326 | * This is only used by of_gpiochip_remove to free hogged gpios | |
4327 | */ | |
4328 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
4329 | { | |
4330 | int id; | |
4331 | ||
4332 | for (id = 0; id < chip->ngpio; id++) { | |
1c3cdb18 LW |
4333 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
4334 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); | |
f625d460 BP |
4335 | } |
4336 | } | |
4337 | ||
66858527 RI |
4338 | /** |
4339 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
4340 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4341 | * @con_id: function within the GPIO consumer | |
4342 | * @flags: optional GPIO initialization flags | |
4343 | * | |
4344 | * This function acquires all the GPIOs defined under a given function. | |
4345 | * | |
4346 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
4347 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
4348 | * code if an error occurred while trying to acquire the GPIOs. | |
4349 | */ | |
4350 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
4351 | const char *con_id, | |
4352 | enum gpiod_flags flags) | |
4353 | { | |
4354 | struct gpio_desc *desc; | |
4355 | struct gpio_descs *descs; | |
bf9346f5 JK |
4356 | struct gpio_array *array_info = NULL; |
4357 | struct gpio_chip *chip; | |
4358 | int count, bitmap_size; | |
66858527 RI |
4359 | |
4360 | count = gpiod_count(dev, con_id); | |
4361 | if (count < 0) | |
4362 | return ERR_PTR(count); | |
4363 | ||
acafe7e3 | 4364 | descs = kzalloc(struct_size(descs, desc, count), GFP_KERNEL); |
66858527 RI |
4365 | if (!descs) |
4366 | return ERR_PTR(-ENOMEM); | |
4367 | ||
4368 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
4369 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
4370 | if (IS_ERR(desc)) { | |
4371 | gpiod_put_array(descs); | |
4372 | return ERR_CAST(desc); | |
4373 | } | |
bf9346f5 | 4374 | |
66858527 | 4375 | descs->desc[descs->ndescs] = desc; |
bf9346f5 JK |
4376 | |
4377 | chip = gpiod_to_chip(desc); | |
4378 | /* | |
4379 | * Select a chip of first array member | |
4380 | * whose index matches its pin hardware number | |
4381 | * as a candidate for fast bitmap processing. | |
4382 | */ | |
4383 | if (!array_info && gpio_chip_hwgpio(desc) == descs->ndescs) { | |
4384 | struct gpio_descs *array; | |
4385 | ||
4386 | bitmap_size = BITS_TO_LONGS(chip->ngpio > count ? | |
4387 | chip->ngpio : count); | |
4388 | ||
4389 | array = kzalloc(struct_size(descs, desc, count) + | |
4390 | struct_size(array_info, invert_mask, | |
4391 | 3 * bitmap_size), GFP_KERNEL); | |
4392 | if (!array) { | |
4393 | gpiod_put_array(descs); | |
4394 | return ERR_PTR(-ENOMEM); | |
4395 | } | |
4396 | ||
4397 | memcpy(array, descs, | |
4398 | struct_size(descs, desc, descs->ndescs + 1)); | |
4399 | kfree(descs); | |
4400 | ||
4401 | descs = array; | |
4402 | array_info = (void *)(descs->desc + count); | |
4403 | array_info->get_mask = array_info->invert_mask + | |
4404 | bitmap_size; | |
4405 | array_info->set_mask = array_info->get_mask + | |
4406 | bitmap_size; | |
4407 | ||
4408 | array_info->desc = descs->desc; | |
4409 | array_info->size = count; | |
4410 | array_info->chip = chip; | |
4411 | bitmap_set(array_info->get_mask, descs->ndescs, | |
4412 | count - descs->ndescs); | |
4413 | bitmap_set(array_info->set_mask, descs->ndescs, | |
4414 | count - descs->ndescs); | |
4415 | descs->info = array_info; | |
4416 | } | |
4417 | /* | |
4418 | * Unmark members which don't qualify for fast bitmap | |
4419 | * processing (different chip, not in hardware order) | |
4420 | */ | |
4421 | if (array_info && (chip != array_info->chip || | |
4422 | gpio_chip_hwgpio(desc) != descs->ndescs)) { | |
4423 | __clear_bit(descs->ndescs, array_info->get_mask); | |
4424 | __clear_bit(descs->ndescs, array_info->set_mask); | |
4425 | } else if (array_info) { | |
4426 | /* Exclude open drain or open source from fast output */ | |
4427 | if (gpiochip_line_is_open_drain(chip, descs->ndescs) || | |
4428 | gpiochip_line_is_open_source(chip, descs->ndescs)) | |
4429 | __clear_bit(descs->ndescs, | |
4430 | array_info->set_mask); | |
4431 | /* Identify 'fast' pins which require invertion */ | |
4432 | if (gpiod_is_active_low(desc)) | |
4433 | __set_bit(descs->ndescs, | |
4434 | array_info->invert_mask); | |
4435 | } | |
4436 | ||
66858527 RI |
4437 | descs->ndescs++; |
4438 | } | |
bf9346f5 JK |
4439 | if (array_info) |
4440 | dev_dbg(dev, | |
4441 | "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n", | |
4442 | array_info->chip->label, array_info->size, | |
4443 | *array_info->get_mask, *array_info->set_mask, | |
4444 | *array_info->invert_mask); | |
66858527 RI |
4445 | return descs; |
4446 | } | |
4447 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
4448 | ||
4449 | /** | |
4450 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
4451 | * function | |
4452 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
4453 | * @con_id: function within the GPIO consumer | |
4454 | * @flags: optional GPIO initialization flags | |
4455 | * | |
4456 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
4457 | * assigned to the requested function it will return NULL. | |
4458 | */ | |
4459 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
4460 | const char *con_id, | |
4461 | enum gpiod_flags flags) | |
4462 | { | |
4463 | struct gpio_descs *descs; | |
4464 | ||
4465 | descs = gpiod_get_array(dev, con_id, flags); | |
4466 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
4467 | return NULL; | |
4468 | ||
4469 | return descs; | |
4470 | } | |
4471 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
4472 | ||
bae48da2 AC |
4473 | /** |
4474 | * gpiod_put - dispose of a GPIO descriptor | |
4475 | * @desc: GPIO descriptor to dispose of | |
4476 | * | |
4477 | * No descriptor can be used after gpiod_put() has been called on it. | |
4478 | */ | |
4479 | void gpiod_put(struct gpio_desc *desc) | |
4480 | { | |
4481 | gpiod_free(desc); | |
372e722e | 4482 | } |
bae48da2 | 4483 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 4484 | |
66858527 RI |
4485 | /** |
4486 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
4487 | * @descs: struct gpio_descs containing an array of descriptors | |
4488 | */ | |
4489 | void gpiod_put_array(struct gpio_descs *descs) | |
4490 | { | |
4491 | unsigned int i; | |
4492 | ||
4493 | for (i = 0; i < descs->ndescs; i++) | |
4494 | gpiod_put(descs->desc[i]); | |
4495 | ||
4496 | kfree(descs); | |
4497 | } | |
4498 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
4499 | ||
3c702e99 LW |
4500 | static int __init gpiolib_dev_init(void) |
4501 | { | |
4502 | int ret; | |
4503 | ||
4504 | /* Register GPIO sysfs bus */ | |
b1911710 | 4505 | ret = bus_register(&gpio_bus_type); |
3c702e99 LW |
4506 | if (ret < 0) { |
4507 | pr_err("gpiolib: could not register GPIO bus type\n"); | |
4508 | return ret; | |
4509 | } | |
4510 | ||
4511 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); | |
4512 | if (ret < 0) { | |
4513 | pr_err("gpiolib: failed to allocate char dev region\n"); | |
4514 | bus_unregister(&gpio_bus_type); | |
159f3cd9 GR |
4515 | } else { |
4516 | gpiolib_initialized = true; | |
4517 | gpiochip_setup_devs(); | |
3c702e99 LW |
4518 | } |
4519 | return ret; | |
4520 | } | |
4521 | core_initcall(gpiolib_dev_init); | |
4522 | ||
d2876d08 DB |
4523 | #ifdef CONFIG_DEBUG_FS |
4524 | ||
fdeb8e15 | 4525 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
d2876d08 DB |
4526 | { |
4527 | unsigned i; | |
fdeb8e15 LW |
4528 | struct gpio_chip *chip = gdev->chip; |
4529 | unsigned gpio = gdev->base; | |
4530 | struct gpio_desc *gdesc = &gdev->descs[0]; | |
d2876d08 | 4531 | int is_out; |
d468bf9e | 4532 | int is_irq; |
d2876d08 | 4533 | |
fdeb8e15 | 4534 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
ced433e2 MP |
4535 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
4536 | if (gdesc->name) { | |
4537 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
4538 | gpio, gdesc->name); | |
4539 | } | |
d2876d08 | 4540 | continue; |
ced433e2 | 4541 | } |
d2876d08 | 4542 | |
372e722e | 4543 | gpiod_get_direction(gdesc); |
d2876d08 | 4544 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 4545 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
4546 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
4547 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 | 4548 | is_out ? "out" : "in ", |
1c22a252 | 4549 | chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "? ", |
d468bf9e | 4550 | is_irq ? "IRQ" : " "); |
d2876d08 DB |
4551 | seq_printf(s, "\n"); |
4552 | } | |
4553 | } | |
4554 | ||
f9c4a31f | 4555 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 4556 | { |
362432ae | 4557 | unsigned long flags; |
ff2b1359 | 4558 | struct gpio_device *gdev = NULL; |
cb1650d4 | 4559 | loff_t index = *pos; |
d2876d08 | 4560 | |
f9c4a31f | 4561 | s->private = ""; |
d2876d08 | 4562 | |
362432ae | 4563 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4564 | list_for_each_entry(gdev, &gpio_devices, list) |
362432ae GL |
4565 | if (index-- == 0) { |
4566 | spin_unlock_irqrestore(&gpio_lock, flags); | |
ff2b1359 | 4567 | return gdev; |
f9c4a31f | 4568 | } |
362432ae | 4569 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 4570 | |
cb1650d4 | 4571 | return NULL; |
f9c4a31f TR |
4572 | } |
4573 | ||
4574 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
4575 | { | |
362432ae | 4576 | unsigned long flags; |
ff2b1359 | 4577 | struct gpio_device *gdev = v; |
f9c4a31f TR |
4578 | void *ret = NULL; |
4579 | ||
362432ae | 4580 | spin_lock_irqsave(&gpio_lock, flags); |
ff2b1359 | 4581 | if (list_is_last(&gdev->list, &gpio_devices)) |
cb1650d4 AC |
4582 | ret = NULL; |
4583 | else | |
ff2b1359 | 4584 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
362432ae | 4585 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
4586 | |
4587 | s->private = "\n"; | |
4588 | ++*pos; | |
4589 | ||
4590 | return ret; | |
4591 | } | |
4592 | ||
4593 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
4594 | { | |
4595 | } | |
4596 | ||
4597 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
4598 | { | |
ff2b1359 LW |
4599 | struct gpio_device *gdev = v; |
4600 | struct gpio_chip *chip = gdev->chip; | |
4601 | struct device *parent; | |
4602 | ||
4603 | if (!chip) { | |
4604 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, | |
4605 | dev_name(&gdev->dev)); | |
4606 | return 0; | |
4607 | } | |
f9c4a31f | 4608 | |
ff2b1359 LW |
4609 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
4610 | dev_name(&gdev->dev), | |
fdeb8e15 | 4611 | gdev->base, gdev->base + gdev->ngpio - 1); |
ff2b1359 LW |
4612 | parent = chip->parent; |
4613 | if (parent) | |
4614 | seq_printf(s, ", parent: %s/%s", | |
4615 | parent->bus ? parent->bus->name : "no-bus", | |
4616 | dev_name(parent)); | |
f9c4a31f TR |
4617 | if (chip->label) |
4618 | seq_printf(s, ", %s", chip->label); | |
4619 | if (chip->can_sleep) | |
4620 | seq_printf(s, ", can sleep"); | |
4621 | seq_printf(s, ":\n"); | |
4622 | ||
4623 | if (chip->dbg_show) | |
4624 | chip->dbg_show(s, chip); | |
4625 | else | |
fdeb8e15 | 4626 | gpiolib_dbg_show(s, gdev); |
f9c4a31f | 4627 | |
d2876d08 DB |
4628 | return 0; |
4629 | } | |
4630 | ||
f9c4a31f TR |
4631 | static const struct seq_operations gpiolib_seq_ops = { |
4632 | .start = gpiolib_seq_start, | |
4633 | .next = gpiolib_seq_next, | |
4634 | .stop = gpiolib_seq_stop, | |
4635 | .show = gpiolib_seq_show, | |
4636 | }; | |
4637 | ||
d2876d08 DB |
4638 | static int gpiolib_open(struct inode *inode, struct file *file) |
4639 | { | |
f9c4a31f | 4640 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
4641 | } |
4642 | ||
828c0950 | 4643 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 4644 | .owner = THIS_MODULE, |
d2876d08 DB |
4645 | .open = gpiolib_open, |
4646 | .read = seq_read, | |
4647 | .llseek = seq_lseek, | |
f9c4a31f | 4648 | .release = seq_release, |
d2876d08 DB |
4649 | }; |
4650 | ||
4651 | static int __init gpiolib_debugfs_init(void) | |
4652 | { | |
4653 | /* /sys/kernel/debug/gpio */ | |
4654 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
4655 | NULL, NULL, &gpiolib_operations); | |
4656 | return 0; | |
4657 | } | |
4658 | subsys_initcall(gpiolib_debugfs_init); | |
4659 | ||
4660 | #endif /* DEBUG_FS */ |