Commit | Line | Data |
---|---|---|
d2876d08 DB |
1 | #include <linux/kernel.h> |
2 | #include <linux/module.h> | |
ff77c352 | 3 | #include <linux/interrupt.h> |
d2876d08 DB |
4 | #include <linux/irq.h> |
5 | #include <linux/spinlock.h> | |
1a989d0f | 6 | #include <linux/list.h> |
d8f388d8 DB |
7 | #include <linux/device.h> |
8 | #include <linux/err.h> | |
9 | #include <linux/debugfs.h> | |
10 | #include <linux/seq_file.h> | |
11 | #include <linux/gpio.h> | |
391c970c | 12 | #include <linux/of_gpio.h> |
ff77c352 | 13 | #include <linux/idr.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
7b199811 | 15 | #include <linux/acpi.h> |
53e7cac3 | 16 | #include <linux/gpio/driver.h> |
0a6d3158 | 17 | #include <linux/gpio/machine.h> |
d2876d08 | 18 | |
664e3e5a MW |
19 | #include "gpiolib.h" |
20 | ||
3f397c21 UKK |
21 | #define CREATE_TRACE_POINTS |
22 | #include <trace/events/gpio.h> | |
d2876d08 | 23 | |
79a9becd | 24 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 25 | * |
79a9becd AC |
26 | * The GPIO programming interface allows for inlining speed-critical |
27 | * get/set operations for common cases, so that access to SOC-integrated | |
28 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
29 | */ |
30 | ||
31 | ||
32 | /* When debugging, extend minimal trust to callers and platform code. | |
33 | * Also emit diagnostic messages that may help initial bringup, when | |
34 | * board setup or driver bugs are most common. | |
35 | * | |
36 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
37 | */ | |
38 | #ifdef DEBUG | |
39 | #define extra_checks 1 | |
40 | #else | |
41 | #define extra_checks 0 | |
42 | #endif | |
43 | ||
44 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. | |
45 | * While any GPIO is requested, its gpio_chip is not removable; | |
46 | * each GPIO's "requested" flag serves as a lock and refcount. | |
47 | */ | |
0eb4c6c2 | 48 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 49 | |
6c0b4e6c AC |
50 | #define GPIO_OFFSET_VALID(chip, offset) (offset >= 0 && offset < chip->ngpio) |
51 | ||
bae48da2 AC |
52 | static DEFINE_MUTEX(gpio_lookup_lock); |
53 | static LIST_HEAD(gpio_lookup_list); | |
0eb4c6c2 | 54 | LIST_HEAD(gpio_chips); |
1a2a99c6 | 55 | |
6d86750c JH |
56 | |
57 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
58 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
59 | ||
60 | ||
d2876d08 DB |
61 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
62 | { | |
d2876d08 | 63 | d->label = label; |
d2876d08 DB |
64 | } |
65 | ||
372e722e AC |
66 | /** |
67 | * Convert a GPIO number to its descriptor | |
68 | */ | |
79a9becd | 69 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 70 | { |
14e85c0e AC |
71 | struct gpio_chip *chip; |
72 | unsigned long flags; | |
73 | ||
74 | spin_lock_irqsave(&gpio_lock, flags); | |
75 | ||
76 | list_for_each_entry(chip, &gpio_chips, list) { | |
77 | if (chip->base <= gpio && chip->base + chip->ngpio > gpio) { | |
78 | spin_unlock_irqrestore(&gpio_lock, flags); | |
79 | return &chip->desc[gpio - chip->base]; | |
80 | } | |
81 | } | |
82 | ||
83 | spin_unlock_irqrestore(&gpio_lock, flags); | |
84 | ||
0e9a5edf AC |
85 | if (!gpio_is_valid(gpio)) |
86 | WARN(1, "invalid GPIO %d\n", gpio); | |
87 | ||
14e85c0e | 88 | return NULL; |
372e722e | 89 | } |
79a9becd | 90 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 91 | |
c0017ed7 MP |
92 | /** |
93 | * Convert a GPIO name to its descriptor | |
94 | */ | |
95 | struct gpio_desc *gpio_name_to_desc(const char * const name) | |
96 | { | |
97 | struct gpio_chip *chip; | |
98 | unsigned long flags; | |
99 | ||
100 | spin_lock_irqsave(&gpio_lock, flags); | |
101 | ||
102 | list_for_each_entry(chip, &gpio_chips, list) { | |
103 | int i; | |
104 | ||
105 | for (i = 0; i != chip->ngpio; ++i) { | |
106 | struct gpio_desc *gpio = &chip->desc[i]; | |
107 | ||
108 | if (!gpio->name) | |
109 | continue; | |
110 | ||
111 | if (!strcmp(gpio->name, name)) { | |
112 | spin_unlock_irqrestore(&gpio_lock, flags); | |
113 | return gpio; | |
114 | } | |
115 | } | |
116 | } | |
117 | ||
118 | spin_unlock_irqrestore(&gpio_lock, flags); | |
119 | ||
120 | return NULL; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(gpio_name_to_desc); | |
123 | ||
d468bf9e | 124 | /** |
bb1e88cc | 125 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 126 | */ |
bb1e88cc AC |
127 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
128 | u16 hwnum) | |
d468bf9e | 129 | { |
bb1e88cc | 130 | if (hwnum >= chip->ngpio) |
b7d0a28a | 131 | return ERR_PTR(-EINVAL); |
d468bf9e | 132 | |
bb1e88cc | 133 | return &chip->desc[hwnum]; |
d468bf9e | 134 | } |
372e722e AC |
135 | |
136 | /** | |
137 | * Convert a GPIO descriptor to the integer namespace. | |
138 | * This should disappear in the future but is needed since we still | |
139 | * use GPIO numbers for error messages and sysfs nodes | |
140 | */ | |
79a9becd | 141 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 142 | { |
14e85c0e | 143 | return desc->chip->base + (desc - &desc->chip->desc[0]); |
372e722e | 144 | } |
79a9becd | 145 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
146 | |
147 | ||
79a9becd AC |
148 | /** |
149 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
150 | * @desc: descriptor to return the chip of | |
151 | */ | |
152 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 153 | { |
bcabdef1 | 154 | return desc ? desc->chip : NULL; |
372e722e | 155 | } |
79a9becd | 156 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 157 | |
8d0aab2f AV |
158 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
159 | static int gpiochip_find_base(int ngpio) | |
160 | { | |
83cabe33 AC |
161 | struct gpio_chip *chip; |
162 | int base = ARCH_NR_GPIOS - ngpio; | |
8d0aab2f | 163 | |
83cabe33 AC |
164 | list_for_each_entry_reverse(chip, &gpio_chips, list) { |
165 | /* found a free space? */ | |
166 | if (chip->base + chip->ngpio <= base) | |
167 | break; | |
168 | else | |
169 | /* nope, check the space right before the chip */ | |
170 | base = chip->base - ngpio; | |
8d0aab2f AV |
171 | } |
172 | ||
83cabe33 | 173 | if (gpio_is_valid(base)) { |
8d0aab2f | 174 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
175 | return base; |
176 | } else { | |
177 | pr_err("%s: cannot find free range\n", __func__); | |
178 | return -ENOSPC; | |
169b6a7a | 179 | } |
169b6a7a AV |
180 | } |
181 | ||
79a9becd AC |
182 | /** |
183 | * gpiod_get_direction - return the current direction of a GPIO | |
184 | * @desc: GPIO to get the direction of | |
185 | * | |
186 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
187 | * | |
188 | * This function may sleep if gpiod_cansleep() is true. | |
189 | */ | |
8e53b0f1 | 190 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
191 | { |
192 | struct gpio_chip *chip; | |
372e722e | 193 | unsigned offset; |
80b0a602 MN |
194 | int status = -EINVAL; |
195 | ||
372e722e AC |
196 | chip = gpiod_to_chip(desc); |
197 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
198 | |
199 | if (!chip->get_direction) | |
200 | return status; | |
201 | ||
372e722e | 202 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
203 | if (status > 0) { |
204 | /* GPIOF_DIR_IN, or other positive */ | |
205 | status = 1; | |
8e53b0f1 | 206 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
207 | } |
208 | if (status == 0) { | |
209 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 210 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
211 | } |
212 | return status; | |
213 | } | |
79a9becd | 214 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 215 | |
1a989d0f AC |
216 | /* |
217 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
218 | * by base order. | |
219 | * | |
220 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
221 | * space. | |
222 | */ | |
223 | static int gpiochip_add_to_list(struct gpio_chip *chip) | |
224 | { | |
d1aceb80 | 225 | struct list_head *pos; |
1a989d0f AC |
226 | struct gpio_chip *_chip; |
227 | int err = 0; | |
228 | ||
229 | /* find where to insert our chip */ | |
230 | list_for_each(pos, &gpio_chips) { | |
231 | _chip = list_entry(pos, struct gpio_chip, list); | |
232 | /* shall we insert before _chip? */ | |
233 | if (_chip->base >= chip->base + chip->ngpio) | |
234 | break; | |
235 | } | |
236 | ||
237 | /* are we stepping on the chip right before? */ | |
238 | if (pos != &gpio_chips && pos->prev != &gpio_chips) { | |
239 | _chip = list_entry(pos->prev, struct gpio_chip, list); | |
240 | if (_chip->base + _chip->ngpio > chip->base) { | |
241 | dev_err(chip->dev, | |
242 | "GPIO integer space overlap, cannot add chip\n"); | |
243 | err = -EBUSY; | |
244 | } | |
245 | } | |
246 | ||
247 | if (!err) | |
248 | list_add_tail(&chip->list, pos); | |
249 | ||
250 | return err; | |
251 | } | |
252 | ||
5f3ca732 MP |
253 | /* |
254 | * Takes the names from gc->names and checks if they are all unique. If they | |
255 | * are, they are assigned to their gpio descriptors. | |
256 | * | |
257 | * Returns -EEXIST if one of the names is already used for a different GPIO. | |
258 | */ | |
259 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
260 | { | |
261 | int i; | |
262 | ||
263 | if (!gc->names) | |
264 | return 0; | |
265 | ||
266 | /* First check all names if they are unique */ | |
267 | for (i = 0; i != gc->ngpio; ++i) { | |
268 | struct gpio_desc *gpio; | |
269 | ||
270 | gpio = gpio_name_to_desc(gc->names[i]); | |
271 | if (gpio) { | |
272 | dev_err(gc->dev, "Detected name collision for GPIO name '%s'\n", | |
273 | gc->names[i]); | |
274 | return -EEXIST; | |
275 | } | |
276 | } | |
277 | ||
278 | /* Then add all names to the GPIO descriptors */ | |
279 | for (i = 0; i != gc->ngpio; ++i) | |
280 | gc->desc[i].name = gc->names[i]; | |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
d2876d08 DB |
285 | /** |
286 | * gpiochip_add() - register a gpio_chip | |
287 | * @chip: the chip to register, with chip->base initialized | |
14e85c0e | 288 | * Context: potentially before irqs will work |
d2876d08 DB |
289 | * |
290 | * Returns a negative errno if the chip can't be registered, such as | |
291 | * because the chip->base is invalid or already associated with a | |
292 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 293 | * |
d8f388d8 DB |
294 | * When gpiochip_add() is called very early during boot, so that GPIOs |
295 | * can be freely used, the chip->dev device must be registered before | |
296 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization | |
297 | * for GPIOs will fail rudely. | |
298 | * | |
8d0aab2f AV |
299 | * If chip->base is negative, this requests dynamic assignment of |
300 | * a range of valid GPIOs. | |
d2876d08 DB |
301 | */ |
302 | int gpiochip_add(struct gpio_chip *chip) | |
303 | { | |
304 | unsigned long flags; | |
305 | int status = 0; | |
306 | unsigned id; | |
8d0aab2f | 307 | int base = chip->base; |
14e85c0e | 308 | struct gpio_desc *descs; |
d2876d08 | 309 | |
14e85c0e AC |
310 | descs = kcalloc(chip->ngpio, sizeof(descs[0]), GFP_KERNEL); |
311 | if (!descs) | |
312 | return -ENOMEM; | |
d2876d08 DB |
313 | |
314 | spin_lock_irqsave(&gpio_lock, flags); | |
315 | ||
8d0aab2f AV |
316 | if (base < 0) { |
317 | base = gpiochip_find_base(chip->ngpio); | |
318 | if (base < 0) { | |
319 | status = base; | |
225fce83 JH |
320 | spin_unlock_irqrestore(&gpio_lock, flags); |
321 | goto err_free_descs; | |
8d0aab2f AV |
322 | } |
323 | chip->base = base; | |
324 | } | |
325 | ||
1a989d0f | 326 | status = gpiochip_add_to_list(chip); |
05aa5203 JH |
327 | if (status) { |
328 | spin_unlock_irqrestore(&gpio_lock, flags); | |
329 | goto err_free_descs; | |
330 | } | |
1a989d0f | 331 | |
05aa5203 JH |
332 | for (id = 0; id < chip->ngpio; id++) { |
333 | struct gpio_desc *desc = &descs[id]; | |
334 | ||
335 | desc->chip = chip; | |
336 | ||
337 | /* REVISIT: most hardware initializes GPIOs as inputs (often | |
338 | * with pullups enabled) so power usage is minimized. Linux | |
339 | * code should set the gpio direction first thing; but until | |
340 | * it does, and in case chip->get_direction is not set, we may | |
341 | * expose the wrong direction in sysfs. | |
342 | */ | |
343 | desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0; | |
d2876d08 DB |
344 | } |
345 | ||
14e85c0e AC |
346 | chip->desc = descs; |
347 | ||
3bae4811 ZG |
348 | spin_unlock_irqrestore(&gpio_lock, flags); |
349 | ||
f23f1516 SH |
350 | #ifdef CONFIG_PINCTRL |
351 | INIT_LIST_HEAD(&chip->pin_ranges); | |
352 | #endif | |
353 | ||
3726960e GS |
354 | if (!chip->owner && chip->dev && chip->dev->driver) |
355 | chip->owner = chip->dev->driver->owner; | |
356 | ||
5f3ca732 MP |
357 | status = gpiochip_set_desc_names(chip); |
358 | if (status) | |
359 | goto err_remove_from_list; | |
360 | ||
28355f81 TV |
361 | status = of_gpiochip_add(chip); |
362 | if (status) | |
363 | goto err_remove_chip; | |
364 | ||
664e3e5a | 365 | acpi_gpiochip_add(chip); |
391c970c | 366 | |
426577bd | 367 | status = gpiochip_sysfs_register(chip); |
225fce83 JH |
368 | if (status) |
369 | goto err_remove_chip; | |
cedb1881 | 370 | |
7589e59f | 371 | pr_debug("%s: registered GPIOs %d to %d on device: %s\n", __func__, |
64842aad GL |
372 | chip->base, chip->base + chip->ngpio - 1, |
373 | chip->label ? : "generic"); | |
374 | ||
cedb1881 | 375 | return 0; |
3bae4811 | 376 | |
225fce83 JH |
377 | err_remove_chip: |
378 | acpi_gpiochip_remove(chip); | |
6d86750c | 379 | gpiochip_free_hogs(chip); |
225fce83 | 380 | of_gpiochip_remove(chip); |
5f3ca732 | 381 | err_remove_from_list: |
225fce83 JH |
382 | spin_lock_irqsave(&gpio_lock, flags); |
383 | list_del(&chip->list); | |
3bae4811 | 384 | spin_unlock_irqrestore(&gpio_lock, flags); |
05aa5203 | 385 | chip->desc = NULL; |
225fce83 | 386 | err_free_descs: |
14e85c0e | 387 | kfree(descs); |
14e85c0e | 388 | |
d2876d08 | 389 | /* failures here can mean systems won't boot... */ |
7589e59f | 390 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
cedb1881 AV |
391 | chip->base, chip->base + chip->ngpio - 1, |
392 | chip->label ? : "generic"); | |
d2876d08 DB |
393 | return status; |
394 | } | |
395 | EXPORT_SYMBOL_GPL(gpiochip_add); | |
396 | ||
397 | /** | |
398 | * gpiochip_remove() - unregister a gpio_chip | |
399 | * @chip: the chip to unregister | |
400 | * | |
401 | * A gpio_chip with any GPIOs still requested may not be removed. | |
402 | */ | |
e1db1706 | 403 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 404 | { |
fab28b89 | 405 | struct gpio_desc *desc; |
d2876d08 | 406 | unsigned long flags; |
d2876d08 | 407 | unsigned id; |
fab28b89 | 408 | bool requested = false; |
d2876d08 | 409 | |
426577bd | 410 | gpiochip_sysfs_unregister(chip); |
01cca93a | 411 | |
00acc3dc JH |
412 | gpiochip_irqchip_remove(chip); |
413 | ||
6072b9dc | 414 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 415 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 416 | gpiochip_free_hogs(chip); |
391c970c AV |
417 | of_gpiochip_remove(chip); |
418 | ||
6798acaa | 419 | spin_lock_irqsave(&gpio_lock, flags); |
6c0b4e6c | 420 | for (id = 0; id < chip->ngpio; id++) { |
fab28b89 JH |
421 | desc = &chip->desc[id]; |
422 | desc->chip = NULL; | |
423 | if (test_bit(FLAG_REQUESTED, &desc->flags)) | |
424 | requested = true; | |
d2876d08 | 425 | } |
e1db1706 | 426 | list_del(&chip->list); |
d2876d08 | 427 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 428 | |
fab28b89 JH |
429 | if (requested) |
430 | dev_crit(chip->dev, "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); | |
431 | ||
14e85c0e AC |
432 | kfree(chip->desc); |
433 | chip->desc = NULL; | |
d2876d08 DB |
434 | } |
435 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
436 | ||
594fa265 GL |
437 | /** |
438 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
439 | * @data: data to pass to match function | |
440 | * @callback: Callback function to check gpio_chip | |
441 | * | |
442 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
443 | * determined by a user supplied @match callback. The callback should return | |
444 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
445 | * non-zero, this function will return to the caller and not iterate over any | |
446 | * more gpio_chips. | |
447 | */ | |
07ce8ec7 | 448 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 449 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 450 | void *data)) |
594fa265 | 451 | { |
125eef96 | 452 | struct gpio_chip *chip; |
594fa265 | 453 | unsigned long flags; |
594fa265 GL |
454 | |
455 | spin_lock_irqsave(&gpio_lock, flags); | |
125eef96 AC |
456 | list_for_each_entry(chip, &gpio_chips, list) |
457 | if (match(chip, data)) | |
594fa265 | 458 | break; |
125eef96 AC |
459 | |
460 | /* No match? */ | |
461 | if (&chip->list == &gpio_chips) | |
462 | chip = NULL; | |
594fa265 GL |
463 | spin_unlock_irqrestore(&gpio_lock, flags); |
464 | ||
465 | return chip; | |
466 | } | |
8fa0c9bf | 467 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 468 | |
79697ef9 AC |
469 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
470 | { | |
471 | const char *name = data; | |
472 | ||
473 | return !strcmp(chip->label, name); | |
474 | } | |
475 | ||
476 | static struct gpio_chip *find_chip_by_name(const char *name) | |
477 | { | |
478 | return gpiochip_find((void *)name, gpiochip_match_name); | |
479 | } | |
480 | ||
14250520 LW |
481 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
482 | ||
483 | /* | |
484 | * The following is irqchip helper code for gpiochips. | |
485 | */ | |
486 | ||
487 | /** | |
3f97d5fc LW |
488 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
489 | * @gpiochip: the gpiochip to set the irqchip chain to | |
490 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
491 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
492 | * chained irqchip | |
493 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
494 | * coming out of the gpiochip. If the interrupt is nested rather than |
495 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
496 | */ |
497 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
498 | struct irq_chip *irqchip, | |
499 | int parent_irq, | |
500 | irq_flow_handler_t parent_handler) | |
501 | { | |
83141a77 LW |
502 | unsigned int offset; |
503 | ||
83141a77 LW |
504 | if (!gpiochip->irqdomain) { |
505 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
506 | __func__); | |
1c8732bb LW |
507 | return; |
508 | } | |
509 | ||
3f97d5fc LW |
510 | if (parent_handler) { |
511 | if (gpiochip->can_sleep) { | |
512 | chip_err(gpiochip, | |
513 | "you cannot have chained interrupts on a " | |
514 | "chip that may sleep\n"); | |
515 | return; | |
516 | } | |
3f97d5fc LW |
517 | /* |
518 | * The parent irqchip is already using the chip_data for this | |
519 | * irqchip, so our callbacks simply use the handler_data. | |
520 | */ | |
f7f87753 TG |
521 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
522 | gpiochip); | |
25e4fe92 DES |
523 | |
524 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 525 | } |
83141a77 LW |
526 | |
527 | /* Set the parent IRQ for all affected IRQs */ | |
528 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
529 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), | |
530 | parent_irq); | |
14250520 LW |
531 | } |
532 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
533 | ||
534 | /** | |
535 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
536 | * @d: the irqdomain used by this irqchip | |
537 | * @irq: the global irq number used by this GPIO irqchip irq | |
538 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
539 | * | |
540 | * This function will set up the mapping for a certain IRQ line on a | |
541 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
542 | * stored inside the gpiochip. | |
543 | */ | |
544 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
545 | irq_hw_number_t hwirq) | |
546 | { | |
547 | struct gpio_chip *chip = d->host_data; | |
548 | ||
14250520 | 549 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
550 | /* |
551 | * This lock class tells lockdep that GPIO irqs are in a different | |
552 | * category than their parents, so it won't report false recursion. | |
553 | */ | |
554 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 555 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 556 | /* Chips that can sleep need nested thread handlers */ |
295494af | 557 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 558 | irq_set_nested_thread(irq, 1); |
14250520 | 559 | irq_set_noprobe(irq); |
23393d49 | 560 | |
1333b90f LW |
561 | /* |
562 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
563 | * is passed as default type. | |
564 | */ | |
565 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
566 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
567 | |
568 | return 0; | |
569 | } | |
570 | ||
c3626fde LW |
571 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
572 | { | |
1c8732bb LW |
573 | struct gpio_chip *chip = d->host_data; |
574 | ||
1c8732bb LW |
575 | if (chip->can_sleep) |
576 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
577 | irq_set_chip_and_handler(irq, NULL, NULL); |
578 | irq_set_chip_data(irq, NULL); | |
579 | } | |
580 | ||
14250520 LW |
581 | static const struct irq_domain_ops gpiochip_domain_ops = { |
582 | .map = gpiochip_irq_map, | |
c3626fde | 583 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
584 | /* Virtually all GPIO irqchips are twocell:ed */ |
585 | .xlate = irq_domain_xlate_twocell, | |
586 | }; | |
587 | ||
588 | static int gpiochip_irq_reqres(struct irq_data *d) | |
589 | { | |
590 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
591 | ||
5b76e79c GS |
592 | if (!try_module_get(chip->owner)) |
593 | return -ENODEV; | |
594 | ||
e3a2e878 | 595 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
596 | chip_err(chip, |
597 | "unable to lock HW IRQ %lu for IRQ\n", | |
598 | d->hwirq); | |
5b76e79c | 599 | module_put(chip->owner); |
14250520 LW |
600 | return -EINVAL; |
601 | } | |
602 | return 0; | |
603 | } | |
604 | ||
605 | static void gpiochip_irq_relres(struct irq_data *d) | |
606 | { | |
607 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
608 | ||
e3a2e878 | 609 | gpiochip_unlock_as_irq(chip, d->hwirq); |
5b76e79c | 610 | module_put(chip->owner); |
14250520 LW |
611 | } |
612 | ||
613 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
614 | { | |
615 | return irq_find_mapping(chip->irqdomain, offset); | |
616 | } | |
617 | ||
618 | /** | |
619 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
620 | * @gpiochip: the gpiochip to remove the irqchip from | |
621 | * | |
622 | * This is called only from gpiochip_remove() | |
623 | */ | |
624 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
625 | { | |
c3626fde LW |
626 | unsigned int offset; |
627 | ||
afa82fab MW |
628 | acpi_gpiochip_free_interrupts(gpiochip); |
629 | ||
25e4fe92 DES |
630 | if (gpiochip->irq_parent) { |
631 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
632 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
633 | } | |
634 | ||
c3626fde LW |
635 | /* Remove all IRQ mappings and delete the domain */ |
636 | if (gpiochip->irqdomain) { | |
637 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
e3893386 GS |
638 | irq_dispose_mapping( |
639 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
14250520 | 640 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 641 | } |
14250520 LW |
642 | |
643 | if (gpiochip->irqchip) { | |
644 | gpiochip->irqchip->irq_request_resources = NULL; | |
645 | gpiochip->irqchip->irq_release_resources = NULL; | |
646 | gpiochip->irqchip = NULL; | |
647 | } | |
648 | } | |
649 | ||
650 | /** | |
651 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
652 | * @gpiochip: the gpiochip to add the irqchip to | |
653 | * @irqchip: the irqchip to add to the gpiochip | |
654 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
655 | * allocate gpiochip irqs from | |
656 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
657 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
658 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 659 | * @lock_key: lockdep class |
14250520 LW |
660 | * |
661 | * This function closely associates a certain irqchip with a certain | |
662 | * gpiochip, providing an irq domain to translate the local IRQs to | |
663 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
664 | * is passed as chip data to all related functions. Driver callbacks | |
665 | * need to use container_of() to get their local state containers back | |
666 | * from the gpiochip passed as chip data. An irqdomain will be stored | |
667 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
668 | * translation. The gpiochip will need to be initialized and registered | |
669 | * before calling this function. | |
670 | * | |
c3626fde LW |
671 | * This function will handle two cell:ed simple IRQs and assumes all |
672 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
673 | * need to be open coded. |
674 | */ | |
a0a8bcf4 GS |
675 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
676 | struct irq_chip *irqchip, | |
677 | unsigned int first_irq, | |
678 | irq_flow_handler_t handler, | |
679 | unsigned int type, | |
680 | struct lock_class_key *lock_key) | |
14250520 LW |
681 | { |
682 | struct device_node *of_node; | |
683 | unsigned int offset; | |
c3626fde | 684 | unsigned irq_base = 0; |
14250520 LW |
685 | |
686 | if (!gpiochip || !irqchip) | |
687 | return -EINVAL; | |
688 | ||
689 | if (!gpiochip->dev) { | |
690 | pr_err("missing gpiochip .dev parent pointer\n"); | |
691 | return -EINVAL; | |
692 | } | |
693 | of_node = gpiochip->dev->of_node; | |
694 | #ifdef CONFIG_OF_GPIO | |
695 | /* | |
20a8a968 | 696 | * If the gpiochip has an assigned OF node this takes precedence |
14250520 LW |
697 | * FIXME: get rid of this and use gpiochip->dev->of_node everywhere |
698 | */ | |
699 | if (gpiochip->of_node) | |
700 | of_node = gpiochip->of_node; | |
701 | #endif | |
702 | gpiochip->irqchip = irqchip; | |
703 | gpiochip->irq_handler = handler; | |
704 | gpiochip->irq_default_type = type; | |
705 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 706 | gpiochip->lock_key = lock_key; |
14250520 LW |
707 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
708 | gpiochip->ngpio, first_irq, | |
709 | &gpiochip_domain_ops, gpiochip); | |
710 | if (!gpiochip->irqdomain) { | |
711 | gpiochip->irqchip = NULL; | |
712 | return -EINVAL; | |
713 | } | |
8b67a1f0 RV |
714 | |
715 | /* | |
716 | * It is possible for a driver to override this, but only if the | |
717 | * alternative functions are both implemented. | |
718 | */ | |
719 | if (!irqchip->irq_request_resources && | |
720 | !irqchip->irq_release_resources) { | |
721 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
722 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
723 | } | |
14250520 LW |
724 | |
725 | /* | |
726 | * Prepare the mapping since the irqchip shall be orthogonal to | |
727 | * any gpiochip calls. If the first_irq was zero, this is | |
728 | * necessary to allocate descriptors for all IRQs. | |
729 | */ | |
c3626fde LW |
730 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
731 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); | |
732 | if (offset == 0) | |
733 | /* | |
734 | * Store the base into the gpiochip to be used when | |
735 | * unmapping the irqs. | |
736 | */ | |
737 | gpiochip->irq_base = irq_base; | |
738 | } | |
14250520 | 739 | |
afa82fab MW |
740 | acpi_gpiochip_request_interrupts(gpiochip); |
741 | ||
14250520 LW |
742 | return 0; |
743 | } | |
a0a8bcf4 | 744 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
745 | |
746 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
747 | ||
748 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
749 | ||
750 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
751 | ||
f23f1516 | 752 | #ifdef CONFIG_PINCTRL |
165adc9c | 753 | |
586a87e6 CR |
754 | /** |
755 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
756 | * @chip: the gpiochip to add the range for | |
d32651f6 | 757 | * @pctldev: the pin controller to map to |
586a87e6 CR |
758 | * @gpio_offset: the start offset in the current gpio_chip number space |
759 | * @pin_group: name of the pin group inside the pin controller | |
760 | */ | |
761 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
762 | struct pinctrl_dev *pctldev, | |
763 | unsigned int gpio_offset, const char *pin_group) | |
764 | { | |
765 | struct gpio_pin_range *pin_range; | |
766 | int ret; | |
767 | ||
768 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
769 | if (!pin_range) { | |
1a2a99c6 | 770 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
771 | return -ENOMEM; |
772 | } | |
773 | ||
774 | /* Use local offset as range ID */ | |
775 | pin_range->range.id = gpio_offset; | |
776 | pin_range->range.gc = chip; | |
777 | pin_range->range.name = chip->label; | |
778 | pin_range->range.base = chip->base + gpio_offset; | |
779 | pin_range->pctldev = pctldev; | |
780 | ||
781 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
782 | &pin_range->range.pins, | |
783 | &pin_range->range.npins); | |
61c6375d MN |
784 | if (ret < 0) { |
785 | kfree(pin_range); | |
586a87e6 | 786 | return ret; |
61c6375d | 787 | } |
586a87e6 CR |
788 | |
789 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
790 | ||
1a2a99c6 AS |
791 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
792 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
793 | pinctrl_dev_get_devname(pctldev), pin_group); |
794 | ||
795 | list_add_tail(&pin_range->node, &chip->pin_ranges); | |
796 | ||
797 | return 0; | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
800 | ||
3f0f8670 LW |
801 | /** |
802 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
803 | * @chip: the gpiochip to add the range for | |
804 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
805 | * @gpio_offset: the start offset in the current gpio_chip number space |
806 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
807 | * @npins: the number of pins from the offset of each pin space (GPIO and |
808 | * pin controller) to accumulate in this range | |
809 | */ | |
1e63d7b9 | 810 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 811 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 812 | unsigned int npins) |
f23f1516 SH |
813 | { |
814 | struct gpio_pin_range *pin_range; | |
b4d4b1f0 | 815 | int ret; |
f23f1516 | 816 | |
3f0f8670 | 817 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 818 | if (!pin_range) { |
1a2a99c6 | 819 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 820 | return -ENOMEM; |
f23f1516 SH |
821 | } |
822 | ||
3f0f8670 | 823 | /* Use local offset as range ID */ |
316511c0 | 824 | pin_range->range.id = gpio_offset; |
3f0f8670 | 825 | pin_range->range.gc = chip; |
f23f1516 | 826 | pin_range->range.name = chip->label; |
316511c0 LW |
827 | pin_range->range.base = chip->base + gpio_offset; |
828 | pin_range->range.pin_base = pin_offset; | |
f23f1516 | 829 | pin_range->range.npins = npins; |
192c369c | 830 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 831 | &pin_range->range); |
8f23ca1a | 832 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 833 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 834 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 835 | kfree(pin_range); |
b4d4b1f0 | 836 | return ret; |
3f0f8670 | 837 | } |
1a2a99c6 AS |
838 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
839 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
840 | pinctl_name, |
841 | pin_offset, pin_offset + npins - 1); | |
f23f1516 SH |
842 | |
843 | list_add_tail(&pin_range->node, &chip->pin_ranges); | |
1e63d7b9 LW |
844 | |
845 | return 0; | |
f23f1516 | 846 | } |
165adc9c | 847 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 848 | |
3f0f8670 LW |
849 | /** |
850 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
851 | * @chip: the chip to remove all the mappings for | |
852 | */ | |
f23f1516 SH |
853 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
854 | { | |
855 | struct gpio_pin_range *pin_range, *tmp; | |
856 | ||
857 | list_for_each_entry_safe(pin_range, tmp, &chip->pin_ranges, node) { | |
858 | list_del(&pin_range->node); | |
859 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
860 | &pin_range->range); | |
3f0f8670 | 861 | kfree(pin_range); |
f23f1516 SH |
862 | } |
863 | } | |
165adc9c LW |
864 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
865 | ||
866 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 867 | |
d2876d08 DB |
868 | /* These "optional" allocation calls help prevent drivers from stomping |
869 | * on each other, and help provide better diagnostics in debugfs. | |
870 | * They're called even less than the "set direction" calls. | |
871 | */ | |
77c2d792 | 872 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 873 | { |
77c2d792 MW |
874 | struct gpio_chip *chip = desc->chip; |
875 | int status; | |
d2876d08 DB |
876 | unsigned long flags; |
877 | ||
bcabdef1 AC |
878 | spin_lock_irqsave(&gpio_lock, flags); |
879 | ||
d2876d08 | 880 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 881 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
882 | */ |
883 | ||
884 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
885 | desc_set_label(desc, label ? : "?"); | |
886 | status = 0; | |
438d8908 | 887 | } else { |
d2876d08 | 888 | status = -EBUSY; |
7460db56 | 889 | goto done; |
35e8bb51 DB |
890 | } |
891 | ||
892 | if (chip->request) { | |
893 | /* chip->request may sleep */ | |
894 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 895 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
896 | spin_lock_irqsave(&gpio_lock, flags); |
897 | ||
898 | if (status < 0) { | |
899 | desc_set_label(desc, NULL); | |
35e8bb51 | 900 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 901 | goto done; |
35e8bb51 | 902 | } |
438d8908 | 903 | } |
80b0a602 MN |
904 | if (chip->get_direction) { |
905 | /* chip->get_direction may sleep */ | |
906 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 907 | gpiod_get_direction(desc); |
80b0a602 MN |
908 | spin_lock_irqsave(&gpio_lock, flags); |
909 | } | |
77c2d792 MW |
910 | done: |
911 | spin_unlock_irqrestore(&gpio_lock, flags); | |
912 | return status; | |
913 | } | |
914 | ||
0eb4c6c2 | 915 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
916 | { |
917 | int status = -EPROBE_DEFER; | |
918 | struct gpio_chip *chip; | |
919 | ||
920 | if (!desc) { | |
921 | pr_warn("%s: invalid GPIO\n", __func__); | |
922 | return -EINVAL; | |
923 | } | |
924 | ||
925 | chip = desc->chip; | |
926 | if (!chip) | |
927 | goto done; | |
928 | ||
929 | if (try_module_get(chip->owner)) { | |
930 | status = __gpiod_request(desc, label); | |
931 | if (status < 0) | |
932 | module_put(chip->owner); | |
933 | } | |
934 | ||
d2876d08 DB |
935 | done: |
936 | if (status) | |
7589e59f | 937 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 938 | |
d2876d08 DB |
939 | return status; |
940 | } | |
372e722e | 941 | |
77c2d792 | 942 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 943 | { |
77c2d792 | 944 | bool ret = false; |
d2876d08 | 945 | unsigned long flags; |
35e8bb51 | 946 | struct gpio_chip *chip; |
d2876d08 | 947 | |
3d599d1c UKK |
948 | might_sleep(); |
949 | ||
372e722e | 950 | gpiod_unexport(desc); |
d8f388d8 | 951 | |
d2876d08 DB |
952 | spin_lock_irqsave(&gpio_lock, flags); |
953 | ||
35e8bb51 DB |
954 | chip = desc->chip; |
955 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { | |
956 | if (chip->free) { | |
957 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 958 | might_sleep_if(chip->can_sleep); |
372e722e | 959 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
960 | spin_lock_irqsave(&gpio_lock, flags); |
961 | } | |
d2876d08 | 962 | desc_set_label(desc, NULL); |
07697461 | 963 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 964 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 965 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 966 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 967 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
968 | ret = true; |
969 | } | |
d2876d08 DB |
970 | |
971 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
972 | return ret; |
973 | } | |
974 | ||
0eb4c6c2 | 975 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 MW |
976 | { |
977 | if (desc && __gpiod_free(desc)) | |
978 | module_put(desc->chip->owner); | |
979 | else | |
980 | WARN_ON(extra_checks); | |
d2876d08 | 981 | } |
372e722e | 982 | |
d2876d08 DB |
983 | /** |
984 | * gpiochip_is_requested - return string iff signal was requested | |
985 | * @chip: controller managing the signal | |
986 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
987 | * | |
988 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
989 | * The string returned is the label passed to gpio_request(); if none has been |
990 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
991 | * |
992 | * This function is for use by GPIO controller drivers. The label can | |
993 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
994 | * can help avoid accidentally multiplexing it to another controller. | |
995 | */ | |
996 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
997 | { | |
6c0b4e6c | 998 | struct gpio_desc *desc; |
d2876d08 | 999 | |
6c0b4e6c | 1000 | if (!GPIO_OFFSET_VALID(chip, offset)) |
d2876d08 | 1001 | return NULL; |
6c0b4e6c AC |
1002 | |
1003 | desc = &chip->desc[offset]; | |
1004 | ||
372e722e | 1005 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 1006 | return NULL; |
372e722e | 1007 | return desc->label; |
d2876d08 DB |
1008 | } |
1009 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1010 | ||
77c2d792 MW |
1011 | /** |
1012 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
1013 | * @desc: GPIO descriptor to request | |
1014 | * @label: label for the GPIO | |
1015 | * | |
1016 | * Function allows GPIO chip drivers to request and use their own GPIO | |
1017 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
1018 | * function will not increase reference count of the GPIO chip module. This | |
1019 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
1020 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
1021 | */ | |
abdc08a3 AC |
1022 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
1023 | const char *label) | |
77c2d792 | 1024 | { |
abdc08a3 AC |
1025 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
1026 | int err; | |
77c2d792 | 1027 | |
abdc08a3 AC |
1028 | if (IS_ERR(desc)) { |
1029 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
1030 | return desc; | |
1031 | } | |
1032 | ||
1033 | err = __gpiod_request(desc, label); | |
1034 | if (err < 0) | |
1035 | return ERR_PTR(err); | |
77c2d792 | 1036 | |
abdc08a3 | 1037 | return desc; |
77c2d792 | 1038 | } |
f7d4ad98 | 1039 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
1040 | |
1041 | /** | |
1042 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
1043 | * @desc: GPIO descriptor to free | |
1044 | * | |
1045 | * Function frees the given GPIO requested previously with | |
1046 | * gpiochip_request_own_desc(). | |
1047 | */ | |
1048 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
1049 | { | |
1050 | if (desc) | |
1051 | __gpiod_free(desc); | |
1052 | } | |
f7d4ad98 | 1053 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 DB |
1054 | |
1055 | /* Drivers MUST set GPIO direction before making get/set calls. In | |
1056 | * some cases this is done in early boot, before IRQs are enabled. | |
1057 | * | |
1058 | * As a rule these aren't called more than once (except for drivers | |
1059 | * using the open-drain emulation idiom) so these are natural places | |
1060 | * to accumulate extra debugging checks. Note that we can't (yet) | |
1061 | * rely on gpio_request() having been called beforehand. | |
1062 | */ | |
1063 | ||
79a9becd AC |
1064 | /** |
1065 | * gpiod_direction_input - set the GPIO direction to input | |
1066 | * @desc: GPIO to set to input | |
1067 | * | |
1068 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
1069 | * be called safely on it. | |
1070 | * | |
1071 | * Return 0 in case of success, else an error code. | |
1072 | */ | |
1073 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 1074 | { |
d2876d08 | 1075 | struct gpio_chip *chip; |
d2876d08 DB |
1076 | int status = -EINVAL; |
1077 | ||
be1a4b13 | 1078 | if (!desc || !desc->chip) { |
bcabdef1 AC |
1079 | pr_warn("%s: invalid GPIO\n", __func__); |
1080 | return -EINVAL; | |
1081 | } | |
1082 | ||
be1a4b13 LW |
1083 | chip = desc->chip; |
1084 | if (!chip->get || !chip->direction_input) { | |
6424de5a MB |
1085 | gpiod_warn(desc, |
1086 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 1087 | __func__); |
be1a4b13 LW |
1088 | return -EIO; |
1089 | } | |
1090 | ||
d82da797 | 1091 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
1092 | if (status == 0) |
1093 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 1094 | |
372e722e | 1095 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 1096 | |
d2876d08 DB |
1097 | return status; |
1098 | } | |
79a9becd | 1099 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 1100 | |
ef70bbe1 | 1101 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 1102 | { |
d2876d08 | 1103 | struct gpio_chip *chip; |
d2876d08 DB |
1104 | int status = -EINVAL; |
1105 | ||
d468bf9e LW |
1106 | /* GPIOs used for IRQs shall not be set as output */ |
1107 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
1108 | gpiod_err(desc, | |
1109 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
1110 | __func__); | |
1111 | return -EIO; | |
1112 | } | |
1113 | ||
aca5ce14 LD |
1114 | /* Open drain pin should not be driven to 1 */ |
1115 | if (value && test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
372e722e | 1116 | return gpiod_direction_input(desc); |
aca5ce14 | 1117 | |
25553ff0 LD |
1118 | /* Open source pin should not be driven to 0 */ |
1119 | if (!value && test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
372e722e | 1120 | return gpiod_direction_input(desc); |
25553ff0 | 1121 | |
be1a4b13 LW |
1122 | chip = desc->chip; |
1123 | if (!chip->set || !chip->direction_output) { | |
6424de5a MB |
1124 | gpiod_warn(desc, |
1125 | "%s: missing set() or direction_output() operations\n", | |
1126 | __func__); | |
be1a4b13 LW |
1127 | return -EIO; |
1128 | } | |
1129 | ||
d82da797 | 1130 | status = chip->direction_output(chip, gpio_chip_hwgpio(desc), value); |
d2876d08 DB |
1131 | if (status == 0) |
1132 | set_bit(FLAG_IS_OUT, &desc->flags); | |
372e722e AC |
1133 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1134 | trace_gpio_direction(desc_to_gpio(desc), 0, status); | |
d2876d08 DB |
1135 | return status; |
1136 | } | |
ef70bbe1 PZ |
1137 | |
1138 | /** | |
1139 | * gpiod_direction_output_raw - set the GPIO direction to output | |
1140 | * @desc: GPIO to set to output | |
1141 | * @value: initial output value of the GPIO | |
1142 | * | |
1143 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1144 | * be called safely on it. The initial value of the output must be specified | |
1145 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
1146 | * | |
1147 | * Return 0 in case of success, else an error code. | |
1148 | */ | |
1149 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
1150 | { | |
1151 | if (!desc || !desc->chip) { | |
1152 | pr_warn("%s: invalid GPIO\n", __func__); | |
1153 | return -EINVAL; | |
1154 | } | |
1155 | return _gpiod_direction_output_raw(desc, value); | |
1156 | } | |
1157 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
1158 | ||
1159 | /** | |
90df4fe0 | 1160 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
1161 | * @desc: GPIO to set to output |
1162 | * @value: initial output value of the GPIO | |
1163 | * | |
1164 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1165 | * be called safely on it. The initial value of the output must be specified | |
1166 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1167 | * account. | |
1168 | * | |
1169 | * Return 0 in case of success, else an error code. | |
1170 | */ | |
1171 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
1172 | { | |
1173 | if (!desc || !desc->chip) { | |
1174 | pr_warn("%s: invalid GPIO\n", __func__); | |
1175 | return -EINVAL; | |
1176 | } | |
1177 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1178 | value = !value; | |
1179 | return _gpiod_direction_output_raw(desc, value); | |
1180 | } | |
79a9becd | 1181 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 1182 | |
c4b5be98 | 1183 | /** |
79a9becd | 1184 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
1185 | * @gpio: the gpio to set debounce time |
1186 | * @debounce: debounce time is microseconds | |
65d87656 LW |
1187 | * |
1188 | * returns -ENOTSUPP if the controller does not support setting | |
1189 | * debounce. | |
c4b5be98 | 1190 | */ |
79a9becd | 1191 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 1192 | { |
c4b5be98 | 1193 | struct gpio_chip *chip; |
c4b5be98 | 1194 | |
be1a4b13 | 1195 | if (!desc || !desc->chip) { |
bcabdef1 AC |
1196 | pr_warn("%s: invalid GPIO\n", __func__); |
1197 | return -EINVAL; | |
1198 | } | |
1199 | ||
c4b5be98 | 1200 | chip = desc->chip; |
be1a4b13 | 1201 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
1202 | gpiod_dbg(desc, |
1203 | "%s: missing set() or set_debounce() operations\n", | |
1204 | __func__); | |
65d87656 | 1205 | return -ENOTSUPP; |
be1a4b13 LW |
1206 | } |
1207 | ||
d82da797 | 1208 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 1209 | } |
79a9becd | 1210 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 1211 | |
79a9becd AC |
1212 | /** |
1213 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
1214 | * @desc: the gpio descriptor to test | |
1215 | * | |
1216 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
1217 | */ | |
1218 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 1219 | { |
79a9becd | 1220 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 1221 | } |
79a9becd | 1222 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
1223 | |
1224 | /* I/O calls are only valid after configuration completed; the relevant | |
1225 | * "is this a valid GPIO" error checks should already have been done. | |
1226 | * | |
1227 | * "Get" operations are often inlinable as reading a pin value register, | |
1228 | * and masking the relevant bit in that register. | |
1229 | * | |
1230 | * When "set" operations are inlinable, they involve writing that mask to | |
1231 | * one register to set a low value, or a different register to set it high. | |
1232 | * Otherwise locking is needed, so there may be little value to inlining. | |
1233 | * | |
1234 | *------------------------------------------------------------------------ | |
1235 | * | |
1236 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
1237 | * have requested the GPIO. That can include implicit requesting by | |
1238 | * a direction setting call. Marking a gpio as requested locks its chip | |
1239 | * in memory, guaranteeing that these table lookups need no more locking | |
1240 | * and that gpiochip_remove() will fail. | |
1241 | * | |
1242 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
1243 | * that the GPIO was actually requested. | |
1244 | */ | |
1245 | ||
e20538b8 | 1246 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
1247 | { |
1248 | struct gpio_chip *chip; | |
372e722e | 1249 | int offset; |
e20538b8 | 1250 | int value; |
d2876d08 | 1251 | |
372e722e AC |
1252 | chip = desc->chip; |
1253 | offset = gpio_chip_hwgpio(desc); | |
e20538b8 BA |
1254 | value = chip->get ? chip->get(chip, offset) : -EIO; |
1255 | value = value < 0 ? value : !!value; | |
372e722e | 1256 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 1257 | return value; |
d2876d08 | 1258 | } |
372e722e | 1259 | |
d2876d08 | 1260 | /** |
79a9becd AC |
1261 | * gpiod_get_raw_value() - return a gpio's raw value |
1262 | * @desc: gpio whose value will be returned | |
d2876d08 | 1263 | * |
79a9becd | 1264 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 1265 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1266 | * |
1267 | * This function should be called from contexts where we cannot sleep, and will | |
1268 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1269 | */ |
79a9becd | 1270 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 1271 | { |
bcabdef1 AC |
1272 | if (!desc) |
1273 | return 0; | |
e4e449e8 | 1274 | /* Should be using gpio_get_value_cansleep() */ |
d8e0ac08 | 1275 | WARN_ON(desc->chip->can_sleep); |
79a9becd | 1276 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1277 | } |
79a9becd | 1278 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 1279 | |
79a9becd AC |
1280 | /** |
1281 | * gpiod_get_value() - return a gpio's value | |
1282 | * @desc: gpio whose value will be returned | |
1283 | * | |
1284 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1285 | * account, or negative errno on failure. |
79a9becd AC |
1286 | * |
1287 | * This function should be called from contexts where we cannot sleep, and will | |
1288 | * complain if the GPIO chip functions potentially sleep. | |
1289 | */ | |
1290 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 1291 | { |
79a9becd AC |
1292 | int value; |
1293 | if (!desc) | |
1294 | return 0; | |
1295 | /* Should be using gpio_get_value_cansleep() */ | |
1296 | WARN_ON(desc->chip->can_sleep); | |
1297 | ||
1298 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1299 | if (value < 0) |
1300 | return value; | |
1301 | ||
79a9becd AC |
1302 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1303 | value = !value; | |
1304 | ||
1305 | return value; | |
372e722e | 1306 | } |
79a9becd | 1307 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 1308 | |
aca5ce14 LD |
1309 | /* |
1310 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 1311 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 1312 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 1313 | */ |
23600969 | 1314 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
1315 | { |
1316 | int err = 0; | |
372e722e AC |
1317 | struct gpio_chip *chip = desc->chip; |
1318 | int offset = gpio_chip_hwgpio(desc); | |
1319 | ||
aca5ce14 | 1320 | if (value) { |
372e722e | 1321 | err = chip->direction_input(chip, offset); |
aca5ce14 | 1322 | if (!err) |
372e722e | 1323 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1324 | } else { |
372e722e | 1325 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 1326 | if (!err) |
372e722e | 1327 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1328 | } |
372e722e | 1329 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 1330 | if (err < 0) |
6424de5a MB |
1331 | gpiod_err(desc, |
1332 | "%s: Error in set_value for open drain err %d\n", | |
1333 | __func__, err); | |
aca5ce14 LD |
1334 | } |
1335 | ||
25553ff0 | 1336 | /* |
79a9becd AC |
1337 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
1338 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 1339 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 1340 | */ |
23600969 | 1341 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
1342 | { |
1343 | int err = 0; | |
372e722e AC |
1344 | struct gpio_chip *chip = desc->chip; |
1345 | int offset = gpio_chip_hwgpio(desc); | |
1346 | ||
25553ff0 | 1347 | if (value) { |
372e722e | 1348 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 1349 | if (!err) |
372e722e | 1350 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1351 | } else { |
372e722e | 1352 | err = chip->direction_input(chip, offset); |
25553ff0 | 1353 | if (!err) |
372e722e | 1354 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1355 | } |
372e722e | 1356 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 1357 | if (err < 0) |
6424de5a MB |
1358 | gpiod_err(desc, |
1359 | "%s: Error in set_value for open source err %d\n", | |
1360 | __func__, err); | |
25553ff0 LD |
1361 | } |
1362 | ||
23600969 | 1363 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
1364 | { |
1365 | struct gpio_chip *chip; | |
1366 | ||
372e722e | 1367 | chip = desc->chip; |
372e722e AC |
1368 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1369 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
1370 | _gpio_set_open_drain_value(desc, value); | |
1371 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
1372 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 1373 | else |
372e722e AC |
1374 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
1375 | } | |
1376 | ||
5f424243 RI |
1377 | /* |
1378 | * set multiple outputs on the same chip; | |
1379 | * use the chip's set_multiple function if available; | |
1380 | * otherwise set the outputs sequentially; | |
1381 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
1382 | * defines which outputs are to be changed | |
1383 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
1384 | * defines the values the outputs specified by mask are to be set to | |
1385 | */ | |
1386 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
1387 | unsigned long *mask, unsigned long *bits) | |
1388 | { | |
1389 | if (chip->set_multiple) { | |
1390 | chip->set_multiple(chip, mask, bits); | |
1391 | } else { | |
1392 | int i; | |
1393 | for (i = 0; i < chip->ngpio; i++) { | |
1394 | if (mask[BIT_WORD(i)] == 0) { | |
1395 | /* no more set bits in this mask word; | |
1396 | * skip ahead to the next word */ | |
1397 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
1398 | continue; | |
1399 | } | |
1400 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 1401 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 1402 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
1403 | } |
1404 | } | |
1405 | } | |
1406 | ||
3fff99bc RI |
1407 | static void gpiod_set_array_value_priv(bool raw, bool can_sleep, |
1408 | unsigned int array_size, | |
1409 | struct gpio_desc **desc_array, | |
1410 | int *value_array) | |
5f424243 RI |
1411 | { |
1412 | int i = 0; | |
1413 | ||
1414 | while (i < array_size) { | |
1415 | struct gpio_chip *chip = desc_array[i]->chip; | |
1416 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; | |
1417 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
1418 | int count = 0; | |
1419 | ||
38e003f4 | 1420 | if (!can_sleep) |
5f424243 | 1421 | WARN_ON(chip->can_sleep); |
38e003f4 | 1422 | |
5f424243 RI |
1423 | memset(mask, 0, sizeof(mask)); |
1424 | do { | |
1425 | struct gpio_desc *desc = desc_array[i]; | |
1426 | int hwgpio = gpio_chip_hwgpio(desc); | |
1427 | int value = value_array[i]; | |
1428 | ||
1429 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1430 | value = !value; | |
1431 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
1432 | /* | |
1433 | * collect all normal outputs belonging to the same chip | |
1434 | * open drain and open source outputs are set individually | |
1435 | */ | |
1436 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 1437 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
1438 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
1439 | _gpio_set_open_source_value(desc, value); | |
1440 | } else { | |
1441 | __set_bit(hwgpio, mask); | |
38e003f4 | 1442 | if (value) |
5f424243 | 1443 | __set_bit(hwgpio, bits); |
38e003f4 | 1444 | else |
5f424243 | 1445 | __clear_bit(hwgpio, bits); |
5f424243 RI |
1446 | count++; |
1447 | } | |
1448 | i++; | |
1449 | } while ((i < array_size) && (desc_array[i]->chip == chip)); | |
1450 | /* push collected bits to outputs */ | |
38e003f4 | 1451 | if (count != 0) |
5f424243 | 1452 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
1453 | } |
1454 | } | |
1455 | ||
d2876d08 | 1456 | /** |
79a9becd AC |
1457 | * gpiod_set_raw_value() - assign a gpio's raw value |
1458 | * @desc: gpio whose value will be assigned | |
d2876d08 | 1459 | * @value: value to assign |
d2876d08 | 1460 | * |
79a9becd AC |
1461 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
1462 | * regard for its ACTIVE_LOW status. | |
1463 | * | |
1464 | * This function should be called from contexts where we cannot sleep, and will | |
1465 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1466 | */ |
79a9becd | 1467 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 1468 | { |
bcabdef1 AC |
1469 | if (!desc) |
1470 | return; | |
e4e449e8 | 1471 | /* Should be using gpio_set_value_cansleep() */ |
d8e0ac08 | 1472 | WARN_ON(desc->chip->can_sleep); |
79a9becd | 1473 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 1474 | } |
79a9becd | 1475 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
1476 | |
1477 | /** | |
79a9becd AC |
1478 | * gpiod_set_value() - assign a gpio's value |
1479 | * @desc: gpio whose value will be assigned | |
1480 | * @value: value to assign | |
1481 | * | |
1482 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1483 | * account | |
d2876d08 | 1484 | * |
79a9becd AC |
1485 | * This function should be called from contexts where we cannot sleep, and will |
1486 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1487 | */ |
79a9becd | 1488 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 1489 | { |
bcabdef1 | 1490 | if (!desc) |
79a9becd AC |
1491 | return; |
1492 | /* Should be using gpio_set_value_cansleep() */ | |
1493 | WARN_ON(desc->chip->can_sleep); | |
1494 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1495 | value = !value; | |
1496 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1497 | } |
79a9becd | 1498 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 1499 | |
5f424243 | 1500 | /** |
3fff99bc | 1501 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1502 | * @array_size: number of elements in the descriptor / value arrays |
1503 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1504 | * @value_array: array of values to assign | |
1505 | * | |
1506 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1507 | * without regard for their ACTIVE_LOW status. | |
1508 | * | |
1509 | * This function should be called from contexts where we cannot sleep, and will | |
1510 | * complain if the GPIO chip functions potentially sleep. | |
1511 | */ | |
3fff99bc | 1512 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
1513 | struct gpio_desc **desc_array, int *value_array) |
1514 | { | |
1515 | if (!desc_array) | |
1516 | return; | |
3fff99bc RI |
1517 | gpiod_set_array_value_priv(true, false, array_size, desc_array, |
1518 | value_array); | |
5f424243 | 1519 | } |
3fff99bc | 1520 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
1521 | |
1522 | /** | |
3fff99bc | 1523 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1524 | * @array_size: number of elements in the descriptor / value arrays |
1525 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1526 | * @value_array: array of values to assign | |
1527 | * | |
1528 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
1529 | * into account. | |
1530 | * | |
1531 | * This function should be called from contexts where we cannot sleep, and will | |
1532 | * complain if the GPIO chip functions potentially sleep. | |
1533 | */ | |
3fff99bc RI |
1534 | void gpiod_set_array_value(unsigned int array_size, |
1535 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
1536 | { |
1537 | if (!desc_array) | |
1538 | return; | |
3fff99bc RI |
1539 | gpiod_set_array_value_priv(false, false, array_size, desc_array, |
1540 | value_array); | |
5f424243 | 1541 | } |
3fff99bc | 1542 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 1543 | |
d2876d08 | 1544 | /** |
79a9becd AC |
1545 | * gpiod_cansleep() - report whether gpio value access may sleep |
1546 | * @desc: gpio to check | |
d2876d08 | 1547 | * |
d2876d08 | 1548 | */ |
79a9becd | 1549 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 1550 | { |
bcabdef1 AC |
1551 | if (!desc) |
1552 | return 0; | |
372e722e | 1553 | return desc->chip->can_sleep; |
d2876d08 | 1554 | } |
79a9becd | 1555 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 1556 | |
0f6d504e | 1557 | /** |
79a9becd AC |
1558 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
1559 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 1560 | * |
79a9becd AC |
1561 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
1562 | * error. | |
0f6d504e | 1563 | */ |
79a9becd | 1564 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e DB |
1565 | { |
1566 | struct gpio_chip *chip; | |
372e722e | 1567 | int offset; |
0f6d504e | 1568 | |
bcabdef1 AC |
1569 | if (!desc) |
1570 | return -EINVAL; | |
372e722e AC |
1571 | chip = desc->chip; |
1572 | offset = gpio_chip_hwgpio(desc); | |
1573 | return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO; | |
0f6d504e | 1574 | } |
79a9becd | 1575 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 1576 | |
d468bf9e | 1577 | /** |
e3a2e878 | 1578 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
1579 | * @chip: the chip the GPIO to lock belongs to |
1580 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1581 | * |
1582 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 1583 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 1584 | */ |
e3a2e878 | 1585 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 1586 | { |
d74be6df | 1587 | if (offset >= chip->ngpio) |
d468bf9e LW |
1588 | return -EINVAL; |
1589 | ||
d74be6df AC |
1590 | if (test_bit(FLAG_IS_OUT, &chip->desc[offset].flags)) { |
1591 | chip_err(chip, | |
d468bf9e LW |
1592 | "%s: tried to flag a GPIO set as output for IRQ\n", |
1593 | __func__); | |
1594 | return -EIO; | |
1595 | } | |
1596 | ||
d74be6df | 1597 | set_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags); |
d468bf9e | 1598 | return 0; |
372e722e | 1599 | } |
e3a2e878 | 1600 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 1601 | |
d468bf9e | 1602 | /** |
e3a2e878 | 1603 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
1604 | * @chip: the chip the GPIO to lock belongs to |
1605 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1606 | * |
1607 | * This is used directly by GPIO drivers that want to indicate | |
1608 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 1609 | */ |
e3a2e878 | 1610 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 1611 | { |
d74be6df | 1612 | if (offset >= chip->ngpio) |
d468bf9e | 1613 | return; |
d2876d08 | 1614 | |
d74be6df | 1615 | clear_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags); |
d468bf9e | 1616 | } |
e3a2e878 | 1617 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 1618 | |
79a9becd AC |
1619 | /** |
1620 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
1621 | * @desc: gpio whose value will be returned | |
1622 | * | |
1623 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 1624 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1625 | * |
1626 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 1627 | */ |
79a9becd | 1628 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 1629 | { |
d2876d08 | 1630 | might_sleep_if(extra_checks); |
bcabdef1 AC |
1631 | if (!desc) |
1632 | return 0; | |
79a9becd | 1633 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1634 | } |
79a9becd | 1635 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 1636 | |
79a9becd AC |
1637 | /** |
1638 | * gpiod_get_value_cansleep() - return a gpio's value | |
1639 | * @desc: gpio whose value will be returned | |
1640 | * | |
1641 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1642 | * account, or negative errno on failure. |
79a9becd AC |
1643 | * |
1644 | * This function is to be called from contexts that can sleep. | |
1645 | */ | |
1646 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 1647 | { |
3f397c21 | 1648 | int value; |
d2876d08 DB |
1649 | |
1650 | might_sleep_if(extra_checks); | |
bcabdef1 AC |
1651 | if (!desc) |
1652 | return 0; | |
79a9becd AC |
1653 | |
1654 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1655 | if (value < 0) |
1656 | return value; | |
1657 | ||
79a9becd AC |
1658 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1659 | value = !value; | |
1660 | ||
3f397c21 | 1661 | return value; |
d2876d08 | 1662 | } |
79a9becd | 1663 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 1664 | |
79a9becd AC |
1665 | /** |
1666 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
1667 | * @desc: gpio whose value will be assigned | |
1668 | * @value: value to assign | |
1669 | * | |
1670 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
1671 | * regard for its ACTIVE_LOW status. | |
1672 | * | |
1673 | * This function is to be called from contexts that can sleep. | |
1674 | */ | |
1675 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 1676 | { |
d2876d08 | 1677 | might_sleep_if(extra_checks); |
bcabdef1 AC |
1678 | if (!desc) |
1679 | return; | |
79a9becd | 1680 | _gpiod_set_raw_value(desc, value); |
372e722e | 1681 | } |
79a9becd | 1682 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 1683 | |
79a9becd AC |
1684 | /** |
1685 | * gpiod_set_value_cansleep() - assign a gpio's value | |
1686 | * @desc: gpio whose value will be assigned | |
1687 | * @value: value to assign | |
1688 | * | |
1689 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1690 | * account | |
1691 | * | |
1692 | * This function is to be called from contexts that can sleep. | |
1693 | */ | |
1694 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 1695 | { |
d2876d08 | 1696 | might_sleep_if(extra_checks); |
bcabdef1 AC |
1697 | if (!desc) |
1698 | return; | |
79a9becd AC |
1699 | |
1700 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1701 | value = !value; | |
1702 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1703 | } |
79a9becd | 1704 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 1705 | |
5f424243 | 1706 | /** |
3fff99bc | 1707 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
1708 | * @array_size: number of elements in the descriptor / value arrays |
1709 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1710 | * @value_array: array of values to assign | |
1711 | * | |
1712 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1713 | * without regard for their ACTIVE_LOW status. | |
1714 | * | |
1715 | * This function is to be called from contexts that can sleep. | |
1716 | */ | |
3fff99bc RI |
1717 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
1718 | struct gpio_desc **desc_array, | |
1719 | int *value_array) | |
5f424243 RI |
1720 | { |
1721 | might_sleep_if(extra_checks); | |
1722 | if (!desc_array) | |
1723 | return; | |
3fff99bc RI |
1724 | gpiod_set_array_value_priv(true, true, array_size, desc_array, |
1725 | value_array); | |
5f424243 | 1726 | } |
3fff99bc | 1727 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
1728 | |
1729 | /** | |
3fff99bc | 1730 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
1731 | * @array_size: number of elements in the descriptor / value arrays |
1732 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1733 | * @value_array: array of values to assign | |
1734 | * | |
1735 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
1736 | * into account. | |
1737 | * | |
1738 | * This function is to be called from contexts that can sleep. | |
1739 | */ | |
3fff99bc RI |
1740 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
1741 | struct gpio_desc **desc_array, | |
1742 | int *value_array) | |
5f424243 RI |
1743 | { |
1744 | might_sleep_if(extra_checks); | |
1745 | if (!desc_array) | |
1746 | return; | |
3fff99bc RI |
1747 | gpiod_set_array_value_priv(false, true, array_size, desc_array, |
1748 | value_array); | |
5f424243 | 1749 | } |
3fff99bc | 1750 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 1751 | |
bae48da2 | 1752 | /** |
ad824783 AC |
1753 | * gpiod_add_lookup_table() - register GPIO device consumers |
1754 | * @table: table of consumers to register | |
bae48da2 | 1755 | */ |
ad824783 | 1756 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
1757 | { |
1758 | mutex_lock(&gpio_lookup_lock); | |
1759 | ||
ad824783 | 1760 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
1761 | |
1762 | mutex_unlock(&gpio_lookup_lock); | |
1763 | } | |
1764 | ||
be9015ab SK |
1765 | /** |
1766 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
1767 | * @table: table of consumers to unregister | |
1768 | */ | |
1769 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
1770 | { | |
1771 | mutex_lock(&gpio_lookup_lock); | |
1772 | ||
1773 | list_del(&table->list); | |
1774 | ||
1775 | mutex_unlock(&gpio_lookup_lock); | |
1776 | } | |
1777 | ||
bae48da2 | 1778 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
1779 | unsigned int idx, |
1780 | enum gpio_lookup_flags *flags) | |
bae48da2 AC |
1781 | { |
1782 | char prop_name[32]; /* 32 is max size of property name */ | |
1783 | enum of_gpio_flags of_flags; | |
1784 | struct gpio_desc *desc; | |
dd34c37a | 1785 | unsigned int i; |
bae48da2 | 1786 | |
7f2e553a | 1787 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
dd34c37a | 1788 | if (con_id) |
9e089246 | 1789 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, |
7f2e553a | 1790 | gpio_suffixes[i]); |
dd34c37a | 1791 | else |
9e089246 | 1792 | snprintf(prop_name, sizeof(prop_name), "%s", |
7f2e553a | 1793 | gpio_suffixes[i]); |
bae48da2 | 1794 | |
dd34c37a TR |
1795 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, |
1796 | &of_flags); | |
06fc3b70 | 1797 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) |
dd34c37a TR |
1798 | break; |
1799 | } | |
bae48da2 AC |
1800 | |
1801 | if (IS_ERR(desc)) | |
1802 | return desc; | |
1803 | ||
1804 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
53e7cac3 | 1805 | *flags |= GPIO_ACTIVE_LOW; |
bae48da2 AC |
1806 | |
1807 | return desc; | |
1808 | } | |
d2876d08 | 1809 | |
81f59e9d | 1810 | static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
1811 | unsigned int idx, |
1812 | enum gpio_lookup_flags *flags) | |
372e722e | 1813 | { |
0d9a693c | 1814 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e01f440a MW |
1815 | struct acpi_gpio_info info; |
1816 | struct gpio_desc *desc; | |
0d9a693c MW |
1817 | char propname[32]; |
1818 | int i; | |
e01f440a | 1819 | |
0d9a693c | 1820 | /* Try first from _DSD */ |
7f2e553a | 1821 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
0d9a693c MW |
1822 | if (con_id && strcmp(con_id, "gpios")) { |
1823 | snprintf(propname, sizeof(propname), "%s-%s", | |
7f2e553a | 1824 | con_id, gpio_suffixes[i]); |
0d9a693c MW |
1825 | } else { |
1826 | snprintf(propname, sizeof(propname), "%s", | |
7f2e553a | 1827 | gpio_suffixes[i]); |
0d9a693c MW |
1828 | } |
1829 | ||
1830 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
1831 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) | |
1832 | break; | |
1833 | } | |
1834 | ||
1835 | /* Then from plain _CRS GPIOs */ | |
1836 | if (IS_ERR(desc)) { | |
1837 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); | |
1838 | if (IS_ERR(desc)) | |
1839 | return desc; | |
1840 | } | |
e01f440a | 1841 | |
0d9a693c | 1842 | if (info.active_low) |
53e7cac3 | 1843 | *flags |= GPIO_ACTIVE_LOW; |
e01f440a MW |
1844 | |
1845 | return desc; | |
81f59e9d MW |
1846 | } |
1847 | ||
ad824783 | 1848 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
1849 | { |
1850 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 1851 | struct gpiod_lookup_table *table; |
bae48da2 AC |
1852 | |
1853 | mutex_lock(&gpio_lookup_lock); | |
1854 | ||
ad824783 AC |
1855 | list_for_each_entry(table, &gpio_lookup_list, list) { |
1856 | if (table->dev_id && dev_id) { | |
1857 | /* | |
1858 | * Valid strings on both ends, must be identical to have | |
1859 | * a match | |
1860 | */ | |
1861 | if (!strcmp(table->dev_id, dev_id)) | |
1862 | goto found; | |
1863 | } else { | |
1864 | /* | |
1865 | * One of the pointers is NULL, so both must be to have | |
1866 | * a match | |
1867 | */ | |
1868 | if (dev_id == table->dev_id) | |
1869 | goto found; | |
1870 | } | |
1871 | } | |
1872 | table = NULL; | |
bae48da2 | 1873 | |
ad824783 AC |
1874 | found: |
1875 | mutex_unlock(&gpio_lookup_lock); | |
1876 | return table; | |
1877 | } | |
bae48da2 | 1878 | |
ad824783 AC |
1879 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
1880 | unsigned int idx, | |
1881 | enum gpio_lookup_flags *flags) | |
1882 | { | |
2a3cf6a3 | 1883 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
1884 | struct gpiod_lookup_table *table; |
1885 | struct gpiod_lookup *p; | |
bae48da2 | 1886 | |
ad824783 AC |
1887 | table = gpiod_find_lookup_table(dev); |
1888 | if (!table) | |
1889 | return desc; | |
bae48da2 | 1890 | |
ad824783 AC |
1891 | for (p = &table->table[0]; p->chip_label; p++) { |
1892 | struct gpio_chip *chip; | |
bae48da2 | 1893 | |
ad824783 | 1894 | /* idx must always match exactly */ |
bae48da2 AC |
1895 | if (p->idx != idx) |
1896 | continue; | |
1897 | ||
ad824783 AC |
1898 | /* If the lookup entry has a con_id, require exact match */ |
1899 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
1900 | continue; | |
bae48da2 | 1901 | |
ad824783 | 1902 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 1903 | |
ad824783 | 1904 | if (!chip) { |
2a3cf6a3 AC |
1905 | dev_err(dev, "cannot find GPIO chip %s\n", |
1906 | p->chip_label); | |
1907 | return ERR_PTR(-ENODEV); | |
ad824783 | 1908 | } |
bae48da2 | 1909 | |
ad824783 | 1910 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
1911 | dev_err(dev, |
1912 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
1913 | idx, chip->ngpio, chip->label); | |
1914 | return ERR_PTR(-EINVAL); | |
bae48da2 | 1915 | } |
bae48da2 | 1916 | |
bb1e88cc | 1917 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 1918 | *flags = p->flags; |
bae48da2 | 1919 | |
2a3cf6a3 | 1920 | return desc; |
bae48da2 AC |
1921 | } |
1922 | ||
bae48da2 AC |
1923 | return desc; |
1924 | } | |
1925 | ||
66858527 RI |
1926 | static int dt_gpio_count(struct device *dev, const char *con_id) |
1927 | { | |
1928 | int ret; | |
1929 | char propname[32]; | |
1930 | unsigned int i; | |
1931 | ||
1932 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
1933 | if (con_id) | |
1934 | snprintf(propname, sizeof(propname), "%s-%s", | |
1935 | con_id, gpio_suffixes[i]); | |
1936 | else | |
1937 | snprintf(propname, sizeof(propname), "%s", | |
1938 | gpio_suffixes[i]); | |
1939 | ||
1940 | ret = of_gpio_named_count(dev->of_node, propname); | |
1941 | if (ret >= 0) | |
1942 | break; | |
1943 | } | |
1944 | return ret; | |
1945 | } | |
1946 | ||
1947 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
1948 | { | |
1949 | struct gpiod_lookup_table *table; | |
1950 | struct gpiod_lookup *p; | |
1951 | unsigned int count = 0; | |
1952 | ||
1953 | table = gpiod_find_lookup_table(dev); | |
1954 | if (!table) | |
1955 | return -ENOENT; | |
1956 | ||
1957 | for (p = &table->table[0]; p->chip_label; p++) { | |
1958 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
1959 | (!con_id && !p->con_id)) | |
1960 | count++; | |
1961 | } | |
1962 | if (!count) | |
1963 | return -ENOENT; | |
1964 | ||
1965 | return count; | |
1966 | } | |
1967 | ||
1968 | /** | |
1969 | * gpiod_count - return the number of GPIOs associated with a device / function | |
1970 | * or -ENOENT if no GPIO has been assigned to the requested function | |
1971 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
1972 | * @con_id: function within the GPIO consumer | |
1973 | */ | |
1974 | int gpiod_count(struct device *dev, const char *con_id) | |
1975 | { | |
1976 | int count = -ENOENT; | |
1977 | ||
1978 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
1979 | count = dt_gpio_count(dev, con_id); | |
1980 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
1981 | count = acpi_gpio_count(dev, con_id); | |
1982 | ||
1983 | if (count < 0) | |
1984 | count = platform_gpio_count(dev, con_id); | |
1985 | ||
1986 | return count; | |
1987 | } | |
1988 | EXPORT_SYMBOL_GPL(gpiod_count); | |
1989 | ||
bae48da2 | 1990 | /** |
0879162f | 1991 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 1992 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 1993 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 1994 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
1995 | * |
1996 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 1997 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 1998 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 1999 | */ |
b17d1bf1 | 2000 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 2001 | enum gpiod_flags flags) |
bae48da2 | 2002 | { |
39b2bbe3 | 2003 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 2004 | } |
b17d1bf1 | 2005 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 2006 | |
29a1f233 TR |
2007 | /** |
2008 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
2009 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2010 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 2011 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2012 | * |
2013 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
2014 | * the requested function it will return NULL. This is convenient for drivers | |
2015 | * that need to handle optional GPIOs. | |
2016 | */ | |
b17d1bf1 | 2017 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
2018 | const char *con_id, |
2019 | enum gpiod_flags flags) | |
29a1f233 | 2020 | { |
39b2bbe3 | 2021 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 2022 | } |
b17d1bf1 | 2023 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 2024 | |
f625d460 BP |
2025 | |
2026 | /** | |
2027 | * gpiod_configure_flags - helper function to configure a given GPIO | |
2028 | * @desc: gpio whose value will be assigned | |
2029 | * @con_id: function within the GPIO consumer | |
2030 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2031 | * of_get_gpio_hog() | |
2032 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
2033 | * | |
2034 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
2035 | * requested function and/or index, or another IS_ERR() code if an error | |
2036 | * occurred while trying to acquire the GPIO. | |
2037 | */ | |
2038 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
2039 | unsigned long lflags, enum gpiod_flags dflags) | |
2040 | { | |
2041 | int status; | |
2042 | ||
2043 | if (lflags & GPIO_ACTIVE_LOW) | |
2044 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2045 | if (lflags & GPIO_OPEN_DRAIN) | |
2046 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2047 | if (lflags & GPIO_OPEN_SOURCE) | |
2048 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2049 | ||
2050 | /* No particular flag request, return here... */ | |
2051 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
2052 | pr_debug("no flags found for %s\n", con_id); | |
2053 | return 0; | |
2054 | } | |
2055 | ||
2056 | /* Process flags */ | |
2057 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
2058 | status = gpiod_direction_output(desc, | |
2059 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
2060 | else | |
2061 | status = gpiod_direction_input(desc); | |
2062 | ||
2063 | return status; | |
2064 | } | |
2065 | ||
bae48da2 AC |
2066 | /** |
2067 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 2068 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
2069 | * @con_id: function within the GPIO consumer |
2070 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2071 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2072 | * |
2073 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
2074 | * defined one for functions that define several GPIOs. | |
2075 | * | |
2a3cf6a3 AC |
2076 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
2077 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 2078 | * occurred while trying to acquire the GPIO. |
bae48da2 | 2079 | */ |
b17d1bf1 | 2080 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 2081 | const char *con_id, |
39b2bbe3 AC |
2082 | unsigned int idx, |
2083 | enum gpiod_flags flags) | |
bae48da2 | 2084 | { |
35c5d7fd | 2085 | struct gpio_desc *desc = NULL; |
bae48da2 | 2086 | int status; |
39b2bbe3 | 2087 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
2088 | |
2089 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
2090 | ||
4d8440b9 RW |
2091 | if (dev) { |
2092 | /* Using device tree? */ | |
2093 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
2094 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
2095 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
2096 | } else if (ACPI_COMPANION(dev)) { | |
2097 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
2098 | desc = acpi_find_gpio(dev, con_id, idx, &lookupflags); | |
2099 | } | |
35c5d7fd AC |
2100 | } |
2101 | ||
2102 | /* | |
2103 | * Either we are not using DT or ACPI, or their lookup did not return | |
2104 | * a result. In that case, use platform lookup as a fallback. | |
2105 | */ | |
2a3cf6a3 | 2106 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 2107 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 2108 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
2109 | } |
2110 | ||
2111 | if (IS_ERR(desc)) { | |
351cfe0f | 2112 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
2113 | return desc; |
2114 | } | |
2115 | ||
2116 | status = gpiod_request(desc, con_id); | |
bae48da2 AC |
2117 | if (status < 0) |
2118 | return ERR_PTR(status); | |
2119 | ||
f625d460 | 2120 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
39b2bbe3 AC |
2121 | if (status < 0) { |
2122 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
2123 | gpiod_put(desc); | |
2124 | return ERR_PTR(status); | |
2125 | } | |
2126 | ||
bae48da2 AC |
2127 | return desc; |
2128 | } | |
b17d1bf1 | 2129 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 2130 | |
40b73183 MW |
2131 | /** |
2132 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
2133 | * @fwnode: handle of the firmware node | |
2134 | * @propname: name of the firmware property representing the GPIO | |
2135 | * | |
2136 | * This function can be used for drivers that get their configuration | |
2137 | * from firmware. | |
2138 | * | |
2139 | * Function properly finds the corresponding GPIO using whatever is the | |
2140 | * underlying firmware interface and then makes sure that the GPIO | |
2141 | * descriptor is requested before it is returned to the caller. | |
2142 | * | |
2143 | * In case of error an ERR_PTR() is returned. | |
2144 | */ | |
2145 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
2146 | const char *propname) | |
2147 | { | |
2148 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
2149 | bool active_low = false; | |
2150 | int ret; | |
2151 | ||
2152 | if (!fwnode) | |
2153 | return ERR_PTR(-EINVAL); | |
2154 | ||
2155 | if (is_of_node(fwnode)) { | |
2156 | enum of_gpio_flags flags; | |
2157 | ||
c181fb3e | 2158 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 MW |
2159 | &flags); |
2160 | if (!IS_ERR(desc)) | |
2161 | active_low = flags & OF_GPIO_ACTIVE_LOW; | |
2162 | } else if (is_acpi_node(fwnode)) { | |
2163 | struct acpi_gpio_info info; | |
2164 | ||
c181fb3e | 2165 | desc = acpi_get_gpiod_by_index(to_acpi_node(fwnode), propname, 0, |
40b73183 MW |
2166 | &info); |
2167 | if (!IS_ERR(desc)) | |
2168 | active_low = info.active_low; | |
2169 | } | |
2170 | ||
2171 | if (IS_ERR(desc)) | |
2172 | return desc; | |
2173 | ||
2174 | ret = gpiod_request(desc, NULL); | |
2175 | if (ret) | |
2176 | return ERR_PTR(ret); | |
2177 | ||
2178 | /* Only value flag can be set from both DT and ACPI is active_low */ | |
2179 | if (active_low) | |
2180 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2181 | ||
2182 | return desc; | |
2183 | } | |
2184 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
2185 | ||
29a1f233 TR |
2186 | /** |
2187 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
2188 | * function | |
2189 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2190 | * @con_id: function within the GPIO consumer | |
2191 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2192 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2193 | * |
2194 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
2195 | * specified index was assigned to the requested function it will return NULL. | |
2196 | * This is convenient for drivers that need to handle optional GPIOs. | |
2197 | */ | |
b17d1bf1 | 2198 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 2199 | const char *con_id, |
39b2bbe3 AC |
2200 | unsigned int index, |
2201 | enum gpiod_flags flags) | |
29a1f233 TR |
2202 | { |
2203 | struct gpio_desc *desc; | |
2204 | ||
39b2bbe3 | 2205 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
2206 | if (IS_ERR(desc)) { |
2207 | if (PTR_ERR(desc) == -ENOENT) | |
2208 | return NULL; | |
2209 | } | |
2210 | ||
2211 | return desc; | |
2212 | } | |
b17d1bf1 | 2213 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 2214 | |
f625d460 BP |
2215 | /** |
2216 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
2217 | * @desc: gpio whose value will be assigned | |
2218 | * @name: gpio line name | |
2219 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2220 | * of_get_gpio_hog() | |
2221 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
2222 | */ | |
2223 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
2224 | unsigned long lflags, enum gpiod_flags dflags) | |
2225 | { | |
2226 | struct gpio_chip *chip; | |
2227 | struct gpio_desc *local_desc; | |
2228 | int hwnum; | |
2229 | int status; | |
2230 | ||
2231 | chip = gpiod_to_chip(desc); | |
2232 | hwnum = gpio_chip_hwgpio(desc); | |
2233 | ||
2234 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); | |
2235 | if (IS_ERR(local_desc)) { | |
a713890d LW |
2236 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed\n", |
2237 | name, chip->label, hwnum); | |
f625d460 BP |
2238 | return PTR_ERR(local_desc); |
2239 | } | |
2240 | ||
2241 | status = gpiod_configure_flags(desc, name, lflags, dflags); | |
2242 | if (status < 0) { | |
a713890d LW |
2243 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed\n", |
2244 | name, chip->label, hwnum); | |
f625d460 BP |
2245 | gpiochip_free_own_desc(desc); |
2246 | return status; | |
2247 | } | |
2248 | ||
2249 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
2250 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
2251 | ||
2252 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
2253 | desc_to_gpio(desc), name, | |
2254 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
2255 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
2256 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
2257 | ||
2258 | return 0; | |
2259 | } | |
2260 | ||
2261 | /** | |
2262 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
2263 | * @chip: gpio chip to act on | |
2264 | * | |
2265 | * This is only used by of_gpiochip_remove to free hogged gpios | |
2266 | */ | |
2267 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
2268 | { | |
2269 | int id; | |
2270 | ||
2271 | for (id = 0; id < chip->ngpio; id++) { | |
2272 | if (test_bit(FLAG_IS_HOGGED, &chip->desc[id].flags)) | |
2273 | gpiochip_free_own_desc(&chip->desc[id]); | |
2274 | } | |
2275 | } | |
2276 | ||
66858527 RI |
2277 | /** |
2278 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
2279 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2280 | * @con_id: function within the GPIO consumer | |
2281 | * @flags: optional GPIO initialization flags | |
2282 | * | |
2283 | * This function acquires all the GPIOs defined under a given function. | |
2284 | * | |
2285 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
2286 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
2287 | * code if an error occurred while trying to acquire the GPIOs. | |
2288 | */ | |
2289 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
2290 | const char *con_id, | |
2291 | enum gpiod_flags flags) | |
2292 | { | |
2293 | struct gpio_desc *desc; | |
2294 | struct gpio_descs *descs; | |
2295 | int count; | |
2296 | ||
2297 | count = gpiod_count(dev, con_id); | |
2298 | if (count < 0) | |
2299 | return ERR_PTR(count); | |
2300 | ||
2301 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
2302 | GFP_KERNEL); | |
2303 | if (!descs) | |
2304 | return ERR_PTR(-ENOMEM); | |
2305 | ||
2306 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
2307 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
2308 | if (IS_ERR(desc)) { | |
2309 | gpiod_put_array(descs); | |
2310 | return ERR_CAST(desc); | |
2311 | } | |
2312 | descs->desc[descs->ndescs] = desc; | |
2313 | descs->ndescs++; | |
2314 | } | |
2315 | return descs; | |
2316 | } | |
2317 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
2318 | ||
2319 | /** | |
2320 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
2321 | * function | |
2322 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2323 | * @con_id: function within the GPIO consumer | |
2324 | * @flags: optional GPIO initialization flags | |
2325 | * | |
2326 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
2327 | * assigned to the requested function it will return NULL. | |
2328 | */ | |
2329 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
2330 | const char *con_id, | |
2331 | enum gpiod_flags flags) | |
2332 | { | |
2333 | struct gpio_descs *descs; | |
2334 | ||
2335 | descs = gpiod_get_array(dev, con_id, flags); | |
2336 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
2337 | return NULL; | |
2338 | ||
2339 | return descs; | |
2340 | } | |
2341 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
2342 | ||
bae48da2 AC |
2343 | /** |
2344 | * gpiod_put - dispose of a GPIO descriptor | |
2345 | * @desc: GPIO descriptor to dispose of | |
2346 | * | |
2347 | * No descriptor can be used after gpiod_put() has been called on it. | |
2348 | */ | |
2349 | void gpiod_put(struct gpio_desc *desc) | |
2350 | { | |
2351 | gpiod_free(desc); | |
372e722e | 2352 | } |
bae48da2 | 2353 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 2354 | |
66858527 RI |
2355 | /** |
2356 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
2357 | * @descs: struct gpio_descs containing an array of descriptors | |
2358 | */ | |
2359 | void gpiod_put_array(struct gpio_descs *descs) | |
2360 | { | |
2361 | unsigned int i; | |
2362 | ||
2363 | for (i = 0; i < descs->ndescs; i++) | |
2364 | gpiod_put(descs->desc[i]); | |
2365 | ||
2366 | kfree(descs); | |
2367 | } | |
2368 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
2369 | ||
d2876d08 DB |
2370 | #ifdef CONFIG_DEBUG_FS |
2371 | ||
d2876d08 DB |
2372 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
2373 | { | |
2374 | unsigned i; | |
2375 | unsigned gpio = chip->base; | |
6c0b4e6c | 2376 | struct gpio_desc *gdesc = &chip->desc[0]; |
d2876d08 | 2377 | int is_out; |
d468bf9e | 2378 | int is_irq; |
d2876d08 DB |
2379 | |
2380 | for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) { | |
ced433e2 MP |
2381 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
2382 | if (gdesc->name) { | |
2383 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
2384 | gpio, gdesc->name); | |
2385 | } | |
d2876d08 | 2386 | continue; |
ced433e2 | 2387 | } |
d2876d08 | 2388 | |
372e722e | 2389 | gpiod_get_direction(gdesc); |
d2876d08 | 2390 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 2391 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
2392 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
2393 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
2394 | is_out ? "out" : "in ", |
2395 | chip->get | |
2396 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
2397 | : "? ", |
2398 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
2399 | seq_printf(s, "\n"); |
2400 | } | |
2401 | } | |
2402 | ||
f9c4a31f | 2403 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 2404 | { |
362432ae | 2405 | unsigned long flags; |
f9c4a31f | 2406 | struct gpio_chip *chip = NULL; |
cb1650d4 | 2407 | loff_t index = *pos; |
d2876d08 | 2408 | |
f9c4a31f | 2409 | s->private = ""; |
d2876d08 | 2410 | |
362432ae | 2411 | spin_lock_irqsave(&gpio_lock, flags); |
cb1650d4 | 2412 | list_for_each_entry(chip, &gpio_chips, list) |
362432ae GL |
2413 | if (index-- == 0) { |
2414 | spin_unlock_irqrestore(&gpio_lock, flags); | |
cb1650d4 | 2415 | return chip; |
f9c4a31f | 2416 | } |
362432ae | 2417 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 2418 | |
cb1650d4 | 2419 | return NULL; |
f9c4a31f TR |
2420 | } |
2421 | ||
2422 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2423 | { | |
362432ae | 2424 | unsigned long flags; |
f9c4a31f | 2425 | struct gpio_chip *chip = v; |
f9c4a31f TR |
2426 | void *ret = NULL; |
2427 | ||
362432ae | 2428 | spin_lock_irqsave(&gpio_lock, flags); |
cb1650d4 AC |
2429 | if (list_is_last(&chip->list, &gpio_chips)) |
2430 | ret = NULL; | |
2431 | else | |
2432 | ret = list_entry(chip->list.next, struct gpio_chip, list); | |
362432ae | 2433 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
2434 | |
2435 | s->private = "\n"; | |
2436 | ++*pos; | |
2437 | ||
2438 | return ret; | |
2439 | } | |
2440 | ||
2441 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
2442 | { | |
2443 | } | |
2444 | ||
2445 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
2446 | { | |
2447 | struct gpio_chip *chip = v; | |
2448 | struct device *dev; | |
2449 | ||
2450 | seq_printf(s, "%sGPIOs %d-%d", (char *)s->private, | |
2451 | chip->base, chip->base + chip->ngpio - 1); | |
2452 | dev = chip->dev; | |
2453 | if (dev) | |
2454 | seq_printf(s, ", %s/%s", dev->bus ? dev->bus->name : "no-bus", | |
2455 | dev_name(dev)); | |
2456 | if (chip->label) | |
2457 | seq_printf(s, ", %s", chip->label); | |
2458 | if (chip->can_sleep) | |
2459 | seq_printf(s, ", can sleep"); | |
2460 | seq_printf(s, ":\n"); | |
2461 | ||
2462 | if (chip->dbg_show) | |
2463 | chip->dbg_show(s, chip); | |
2464 | else | |
2465 | gpiolib_dbg_show(s, chip); | |
2466 | ||
d2876d08 DB |
2467 | return 0; |
2468 | } | |
2469 | ||
f9c4a31f TR |
2470 | static const struct seq_operations gpiolib_seq_ops = { |
2471 | .start = gpiolib_seq_start, | |
2472 | .next = gpiolib_seq_next, | |
2473 | .stop = gpiolib_seq_stop, | |
2474 | .show = gpiolib_seq_show, | |
2475 | }; | |
2476 | ||
d2876d08 DB |
2477 | static int gpiolib_open(struct inode *inode, struct file *file) |
2478 | { | |
f9c4a31f | 2479 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
2480 | } |
2481 | ||
828c0950 | 2482 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 2483 | .owner = THIS_MODULE, |
d2876d08 DB |
2484 | .open = gpiolib_open, |
2485 | .read = seq_read, | |
2486 | .llseek = seq_lseek, | |
f9c4a31f | 2487 | .release = seq_release, |
d2876d08 DB |
2488 | }; |
2489 | ||
2490 | static int __init gpiolib_debugfs_init(void) | |
2491 | { | |
2492 | /* /sys/kernel/debug/gpio */ | |
2493 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
2494 | NULL, NULL, &gpiolib_operations); | |
2495 | return 0; | |
2496 | } | |
2497 | subsys_initcall(gpiolib_debugfs_init); | |
2498 | ||
2499 | #endif /* DEBUG_FS */ |