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> |
c771c2f4 | 18 | #include <linux/pinctrl/consumer.h> |
d2876d08 | 19 | |
664e3e5a MW |
20 | #include "gpiolib.h" |
21 | ||
3f397c21 UKK |
22 | #define CREATE_TRACE_POINTS |
23 | #include <trace/events/gpio.h> | |
d2876d08 | 24 | |
79a9becd | 25 | /* Implementation infrastructure for GPIO interfaces. |
d2876d08 | 26 | * |
79a9becd AC |
27 | * The GPIO programming interface allows for inlining speed-critical |
28 | * get/set operations for common cases, so that access to SOC-integrated | |
29 | * GPIOs can sometimes cost only an instruction or two per bit. | |
d2876d08 DB |
30 | */ |
31 | ||
32 | ||
33 | /* When debugging, extend minimal trust to callers and platform code. | |
34 | * Also emit diagnostic messages that may help initial bringup, when | |
35 | * board setup or driver bugs are most common. | |
36 | * | |
37 | * Otherwise, minimize overhead in what may be bitbanging codepaths. | |
38 | */ | |
39 | #ifdef DEBUG | |
40 | #define extra_checks 1 | |
41 | #else | |
42 | #define extra_checks 0 | |
43 | #endif | |
44 | ||
45 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. | |
46 | * While any GPIO is requested, its gpio_chip is not removable; | |
47 | * each GPIO's "requested" flag serves as a lock and refcount. | |
48 | */ | |
0eb4c6c2 | 49 | DEFINE_SPINLOCK(gpio_lock); |
d2876d08 | 50 | |
bae48da2 AC |
51 | static DEFINE_MUTEX(gpio_lookup_lock); |
52 | static LIST_HEAD(gpio_lookup_list); | |
0eb4c6c2 | 53 | LIST_HEAD(gpio_chips); |
1a2a99c6 | 54 | |
6d86750c JH |
55 | |
56 | static void gpiochip_free_hogs(struct gpio_chip *chip); | |
57 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); | |
58 | ||
59 | ||
d2876d08 DB |
60 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
61 | { | |
d2876d08 | 62 | d->label = label; |
d2876d08 DB |
63 | } |
64 | ||
372e722e AC |
65 | /** |
66 | * Convert a GPIO number to its descriptor | |
67 | */ | |
79a9becd | 68 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
372e722e | 69 | { |
14e85c0e AC |
70 | struct gpio_chip *chip; |
71 | unsigned long flags; | |
72 | ||
73 | spin_lock_irqsave(&gpio_lock, flags); | |
74 | ||
75 | list_for_each_entry(chip, &gpio_chips, list) { | |
76 | if (chip->base <= gpio && chip->base + chip->ngpio > gpio) { | |
77 | spin_unlock_irqrestore(&gpio_lock, flags); | |
78 | return &chip->desc[gpio - chip->base]; | |
79 | } | |
80 | } | |
81 | ||
82 | spin_unlock_irqrestore(&gpio_lock, flags); | |
83 | ||
0e9a5edf AC |
84 | if (!gpio_is_valid(gpio)) |
85 | WARN(1, "invalid GPIO %d\n", gpio); | |
86 | ||
14e85c0e | 87 | return NULL; |
372e722e | 88 | } |
79a9becd | 89 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
372e722e | 90 | |
d468bf9e | 91 | /** |
bb1e88cc | 92 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
d468bf9e | 93 | */ |
bb1e88cc AC |
94 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
95 | u16 hwnum) | |
d468bf9e | 96 | { |
bb1e88cc | 97 | if (hwnum >= chip->ngpio) |
b7d0a28a | 98 | return ERR_PTR(-EINVAL); |
d468bf9e | 99 | |
bb1e88cc | 100 | return &chip->desc[hwnum]; |
d468bf9e | 101 | } |
372e722e AC |
102 | |
103 | /** | |
104 | * Convert a GPIO descriptor to the integer namespace. | |
105 | * This should disappear in the future but is needed since we still | |
106 | * use GPIO numbers for error messages and sysfs nodes | |
107 | */ | |
79a9becd | 108 | int desc_to_gpio(const struct gpio_desc *desc) |
372e722e | 109 | { |
14e85c0e | 110 | return desc->chip->base + (desc - &desc->chip->desc[0]); |
372e722e | 111 | } |
79a9becd | 112 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
372e722e AC |
113 | |
114 | ||
79a9becd AC |
115 | /** |
116 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs | |
117 | * @desc: descriptor to return the chip of | |
118 | */ | |
119 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
372e722e | 120 | { |
bcabdef1 | 121 | return desc ? desc->chip : NULL; |
372e722e | 122 | } |
79a9becd | 123 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
d2876d08 | 124 | |
8d0aab2f AV |
125 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
126 | static int gpiochip_find_base(int ngpio) | |
127 | { | |
83cabe33 AC |
128 | struct gpio_chip *chip; |
129 | int base = ARCH_NR_GPIOS - ngpio; | |
8d0aab2f | 130 | |
83cabe33 AC |
131 | list_for_each_entry_reverse(chip, &gpio_chips, list) { |
132 | /* found a free space? */ | |
133 | if (chip->base + chip->ngpio <= base) | |
134 | break; | |
135 | else | |
136 | /* nope, check the space right before the chip */ | |
137 | base = chip->base - ngpio; | |
8d0aab2f AV |
138 | } |
139 | ||
83cabe33 | 140 | if (gpio_is_valid(base)) { |
8d0aab2f | 141 | pr_debug("%s: found new base at %d\n", __func__, base); |
83cabe33 AC |
142 | return base; |
143 | } else { | |
144 | pr_err("%s: cannot find free range\n", __func__); | |
145 | return -ENOSPC; | |
169b6a7a | 146 | } |
169b6a7a AV |
147 | } |
148 | ||
79a9becd AC |
149 | /** |
150 | * gpiod_get_direction - return the current direction of a GPIO | |
151 | * @desc: GPIO to get the direction of | |
152 | * | |
153 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. | |
154 | * | |
155 | * This function may sleep if gpiod_cansleep() is true. | |
156 | */ | |
8e53b0f1 | 157 | int gpiod_get_direction(struct gpio_desc *desc) |
80b0a602 MN |
158 | { |
159 | struct gpio_chip *chip; | |
372e722e | 160 | unsigned offset; |
80b0a602 MN |
161 | int status = -EINVAL; |
162 | ||
372e722e AC |
163 | chip = gpiod_to_chip(desc); |
164 | offset = gpio_chip_hwgpio(desc); | |
80b0a602 MN |
165 | |
166 | if (!chip->get_direction) | |
167 | return status; | |
168 | ||
372e722e | 169 | status = chip->get_direction(chip, offset); |
80b0a602 MN |
170 | if (status > 0) { |
171 | /* GPIOF_DIR_IN, or other positive */ | |
172 | status = 1; | |
8e53b0f1 | 173 | clear_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
174 | } |
175 | if (status == 0) { | |
176 | /* GPIOF_DIR_OUT */ | |
8e53b0f1 | 177 | set_bit(FLAG_IS_OUT, &desc->flags); |
80b0a602 MN |
178 | } |
179 | return status; | |
180 | } | |
79a9becd | 181 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
80b0a602 | 182 | |
1a989d0f AC |
183 | /* |
184 | * Add a new chip to the global chips list, keeping the list of chips sorted | |
185 | * by base order. | |
186 | * | |
187 | * Return -EBUSY if the new chip overlaps with some other chip's integer | |
188 | * space. | |
189 | */ | |
190 | static int gpiochip_add_to_list(struct gpio_chip *chip) | |
191 | { | |
d1aceb80 | 192 | struct list_head *pos; |
1a989d0f AC |
193 | struct gpio_chip *_chip; |
194 | int err = 0; | |
195 | ||
196 | /* find where to insert our chip */ | |
197 | list_for_each(pos, &gpio_chips) { | |
198 | _chip = list_entry(pos, struct gpio_chip, list); | |
199 | /* shall we insert before _chip? */ | |
200 | if (_chip->base >= chip->base + chip->ngpio) | |
201 | break; | |
202 | } | |
203 | ||
204 | /* are we stepping on the chip right before? */ | |
205 | if (pos != &gpio_chips && pos->prev != &gpio_chips) { | |
206 | _chip = list_entry(pos->prev, struct gpio_chip, list); | |
207 | if (_chip->base + _chip->ngpio > chip->base) { | |
58383c78 LW |
208 | dev_err(chip->parent, |
209 | "GPIO integer space overlap, cannot add chip\n"); | |
1a989d0f AC |
210 | err = -EBUSY; |
211 | } | |
212 | } | |
213 | ||
214 | if (!err) | |
215 | list_add_tail(&chip->list, pos); | |
216 | ||
217 | return err; | |
218 | } | |
219 | ||
f881bab0 LW |
220 | /** |
221 | * Convert a GPIO name to its descriptor | |
222 | */ | |
223 | static struct gpio_desc *gpio_name_to_desc(const char * const name) | |
224 | { | |
225 | struct gpio_chip *chip; | |
226 | unsigned long flags; | |
227 | ||
228 | spin_lock_irqsave(&gpio_lock, flags); | |
229 | ||
230 | list_for_each_entry(chip, &gpio_chips, list) { | |
231 | int i; | |
232 | ||
233 | for (i = 0; i != chip->ngpio; ++i) { | |
234 | struct gpio_desc *gpio = &chip->desc[i]; | |
235 | ||
236 | if (!gpio->name) | |
237 | continue; | |
238 | ||
239 | if (!strcmp(gpio->name, name)) { | |
240 | spin_unlock_irqrestore(&gpio_lock, flags); | |
241 | return gpio; | |
242 | } | |
243 | } | |
244 | } | |
245 | ||
246 | spin_unlock_irqrestore(&gpio_lock, flags); | |
247 | ||
248 | return NULL; | |
249 | } | |
250 | ||
5f3ca732 MP |
251 | /* |
252 | * Takes the names from gc->names and checks if they are all unique. If they | |
253 | * are, they are assigned to their gpio descriptors. | |
254 | * | |
255 | * Returns -EEXIST if one of the names is already used for a different GPIO. | |
256 | */ | |
257 | static int gpiochip_set_desc_names(struct gpio_chip *gc) | |
258 | { | |
259 | int i; | |
260 | ||
261 | if (!gc->names) | |
262 | return 0; | |
263 | ||
264 | /* First check all names if they are unique */ | |
265 | for (i = 0; i != gc->ngpio; ++i) { | |
266 | struct gpio_desc *gpio; | |
267 | ||
268 | gpio = gpio_name_to_desc(gc->names[i]); | |
f881bab0 | 269 | if (gpio) |
58383c78 | 270 | dev_warn(gc->parent, "Detected name collision for " |
f881bab0 LW |
271 | "GPIO name '%s'\n", |
272 | gc->names[i]); | |
5f3ca732 MP |
273 | } |
274 | ||
275 | /* Then add all names to the GPIO descriptors */ | |
276 | for (i = 0; i != gc->ngpio; ++i) | |
277 | gc->desc[i].name = gc->names[i]; | |
278 | ||
279 | return 0; | |
280 | } | |
281 | ||
d2876d08 DB |
282 | /** |
283 | * gpiochip_add() - register a gpio_chip | |
284 | * @chip: the chip to register, with chip->base initialized | |
14e85c0e | 285 | * Context: potentially before irqs will work |
d2876d08 DB |
286 | * |
287 | * Returns a negative errno if the chip can't be registered, such as | |
288 | * because the chip->base is invalid or already associated with a | |
289 | * different chip. Otherwise it returns zero as a success code. | |
8d0aab2f | 290 | * |
d8f388d8 DB |
291 | * When gpiochip_add() is called very early during boot, so that GPIOs |
292 | * can be freely used, the chip->dev device must be registered before | |
293 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization | |
294 | * for GPIOs will fail rudely. | |
295 | * | |
8d0aab2f AV |
296 | * If chip->base is negative, this requests dynamic assignment of |
297 | * a range of valid GPIOs. | |
d2876d08 DB |
298 | */ |
299 | int gpiochip_add(struct gpio_chip *chip) | |
300 | { | |
301 | unsigned long flags; | |
302 | int status = 0; | |
303 | unsigned id; | |
8d0aab2f | 304 | int base = chip->base; |
14e85c0e | 305 | struct gpio_desc *descs; |
d2876d08 | 306 | |
14e85c0e AC |
307 | descs = kcalloc(chip->ngpio, sizeof(descs[0]), GFP_KERNEL); |
308 | if (!descs) | |
309 | return -ENOMEM; | |
d2876d08 DB |
310 | |
311 | spin_lock_irqsave(&gpio_lock, flags); | |
312 | ||
8d0aab2f AV |
313 | if (base < 0) { |
314 | base = gpiochip_find_base(chip->ngpio); | |
315 | if (base < 0) { | |
316 | status = base; | |
225fce83 JH |
317 | spin_unlock_irqrestore(&gpio_lock, flags); |
318 | goto err_free_descs; | |
8d0aab2f AV |
319 | } |
320 | chip->base = base; | |
321 | } | |
322 | ||
1a989d0f | 323 | status = gpiochip_add_to_list(chip); |
05aa5203 JH |
324 | if (status) { |
325 | spin_unlock_irqrestore(&gpio_lock, flags); | |
326 | goto err_free_descs; | |
327 | } | |
1a989d0f | 328 | |
05aa5203 JH |
329 | for (id = 0; id < chip->ngpio; id++) { |
330 | struct gpio_desc *desc = &descs[id]; | |
331 | ||
332 | desc->chip = chip; | |
333 | ||
334 | /* REVISIT: most hardware initializes GPIOs as inputs (often | |
335 | * with pullups enabled) so power usage is minimized. Linux | |
336 | * code should set the gpio direction first thing; but until | |
337 | * it does, and in case chip->get_direction is not set, we may | |
338 | * expose the wrong direction in sysfs. | |
339 | */ | |
340 | desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0; | |
d2876d08 DB |
341 | } |
342 | ||
14e85c0e AC |
343 | chip->desc = descs; |
344 | ||
3bae4811 ZG |
345 | spin_unlock_irqrestore(&gpio_lock, flags); |
346 | ||
f23f1516 SH |
347 | #ifdef CONFIG_PINCTRL |
348 | INIT_LIST_HEAD(&chip->pin_ranges); | |
349 | #endif | |
350 | ||
58383c78 LW |
351 | if (!chip->owner && chip->parent && chip->parent->driver) |
352 | chip->owner = chip->parent->driver->owner; | |
3726960e | 353 | |
5f3ca732 MP |
354 | status = gpiochip_set_desc_names(chip); |
355 | if (status) | |
356 | goto err_remove_from_list; | |
357 | ||
28355f81 TV |
358 | status = of_gpiochip_add(chip); |
359 | if (status) | |
360 | goto err_remove_chip; | |
361 | ||
664e3e5a | 362 | acpi_gpiochip_add(chip); |
391c970c | 363 | |
426577bd | 364 | status = gpiochip_sysfs_register(chip); |
225fce83 JH |
365 | if (status) |
366 | goto err_remove_chip; | |
cedb1881 | 367 | |
7589e59f | 368 | pr_debug("%s: registered GPIOs %d to %d on device: %s\n", __func__, |
64842aad GL |
369 | chip->base, chip->base + chip->ngpio - 1, |
370 | chip->label ? : "generic"); | |
371 | ||
cedb1881 | 372 | return 0; |
3bae4811 | 373 | |
225fce83 JH |
374 | err_remove_chip: |
375 | acpi_gpiochip_remove(chip); | |
6d86750c | 376 | gpiochip_free_hogs(chip); |
225fce83 | 377 | of_gpiochip_remove(chip); |
5f3ca732 | 378 | err_remove_from_list: |
225fce83 JH |
379 | spin_lock_irqsave(&gpio_lock, flags); |
380 | list_del(&chip->list); | |
3bae4811 | 381 | spin_unlock_irqrestore(&gpio_lock, flags); |
05aa5203 | 382 | chip->desc = NULL; |
225fce83 | 383 | err_free_descs: |
14e85c0e | 384 | kfree(descs); |
14e85c0e | 385 | |
d2876d08 | 386 | /* failures here can mean systems won't boot... */ |
7589e59f | 387 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
cedb1881 AV |
388 | chip->base, chip->base + chip->ngpio - 1, |
389 | chip->label ? : "generic"); | |
d2876d08 DB |
390 | return status; |
391 | } | |
392 | EXPORT_SYMBOL_GPL(gpiochip_add); | |
393 | ||
394 | /** | |
395 | * gpiochip_remove() - unregister a gpio_chip | |
396 | * @chip: the chip to unregister | |
397 | * | |
398 | * A gpio_chip with any GPIOs still requested may not be removed. | |
399 | */ | |
e1db1706 | 400 | void gpiochip_remove(struct gpio_chip *chip) |
d2876d08 | 401 | { |
fab28b89 | 402 | struct gpio_desc *desc; |
d2876d08 | 403 | unsigned long flags; |
d2876d08 | 404 | unsigned id; |
fab28b89 | 405 | bool requested = false; |
d2876d08 | 406 | |
426577bd | 407 | gpiochip_sysfs_unregister(chip); |
01cca93a | 408 | |
00acc3dc JH |
409 | gpiochip_irqchip_remove(chip); |
410 | ||
6072b9dc | 411 | acpi_gpiochip_remove(chip); |
9ef0d6f7 | 412 | gpiochip_remove_pin_ranges(chip); |
f625d460 | 413 | gpiochip_free_hogs(chip); |
391c970c AV |
414 | of_gpiochip_remove(chip); |
415 | ||
6798acaa | 416 | spin_lock_irqsave(&gpio_lock, flags); |
6c0b4e6c | 417 | for (id = 0; id < chip->ngpio; id++) { |
fab28b89 JH |
418 | desc = &chip->desc[id]; |
419 | desc->chip = NULL; | |
420 | if (test_bit(FLAG_REQUESTED, &desc->flags)) | |
421 | requested = true; | |
d2876d08 | 422 | } |
e1db1706 | 423 | list_del(&chip->list); |
d2876d08 | 424 | spin_unlock_irqrestore(&gpio_lock, flags); |
14e85c0e | 425 | |
fab28b89 | 426 | if (requested) |
58383c78 LW |
427 | dev_crit(chip->parent, |
428 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); | |
fab28b89 | 429 | |
14e85c0e AC |
430 | kfree(chip->desc); |
431 | chip->desc = NULL; | |
d2876d08 DB |
432 | } |
433 | EXPORT_SYMBOL_GPL(gpiochip_remove); | |
434 | ||
594fa265 GL |
435 | /** |
436 | * gpiochip_find() - iterator for locating a specific gpio_chip | |
437 | * @data: data to pass to match function | |
438 | * @callback: Callback function to check gpio_chip | |
439 | * | |
440 | * Similar to bus_find_device. It returns a reference to a gpio_chip as | |
441 | * determined by a user supplied @match callback. The callback should return | |
442 | * 0 if the device doesn't match and non-zero if it does. If the callback is | |
443 | * non-zero, this function will return to the caller and not iterate over any | |
444 | * more gpio_chips. | |
445 | */ | |
07ce8ec7 | 446 | struct gpio_chip *gpiochip_find(void *data, |
6e2cf651 | 447 | int (*match)(struct gpio_chip *chip, |
3d0f7cf0 | 448 | void *data)) |
594fa265 | 449 | { |
125eef96 | 450 | struct gpio_chip *chip; |
594fa265 | 451 | unsigned long flags; |
594fa265 GL |
452 | |
453 | spin_lock_irqsave(&gpio_lock, flags); | |
125eef96 AC |
454 | list_for_each_entry(chip, &gpio_chips, list) |
455 | if (match(chip, data)) | |
594fa265 | 456 | break; |
125eef96 AC |
457 | |
458 | /* No match? */ | |
459 | if (&chip->list == &gpio_chips) | |
460 | chip = NULL; | |
594fa265 GL |
461 | spin_unlock_irqrestore(&gpio_lock, flags); |
462 | ||
463 | return chip; | |
464 | } | |
8fa0c9bf | 465 | EXPORT_SYMBOL_GPL(gpiochip_find); |
d2876d08 | 466 | |
79697ef9 AC |
467 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
468 | { | |
469 | const char *name = data; | |
470 | ||
471 | return !strcmp(chip->label, name); | |
472 | } | |
473 | ||
474 | static struct gpio_chip *find_chip_by_name(const char *name) | |
475 | { | |
476 | return gpiochip_find((void *)name, gpiochip_match_name); | |
477 | } | |
478 | ||
14250520 LW |
479 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
480 | ||
481 | /* | |
482 | * The following is irqchip helper code for gpiochips. | |
483 | */ | |
484 | ||
485 | /** | |
3f97d5fc LW |
486 | * gpiochip_set_chained_irqchip() - sets a chained irqchip to a gpiochip |
487 | * @gpiochip: the gpiochip to set the irqchip chain to | |
488 | * @irqchip: the irqchip to chain to the gpiochip | |
14250520 LW |
489 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
490 | * chained irqchip | |
491 | * @parent_handler: the parent interrupt handler for the accumulated IRQ | |
3f97d5fc LW |
492 | * coming out of the gpiochip. If the interrupt is nested rather than |
493 | * cascaded, pass NULL in this handler argument | |
14250520 LW |
494 | */ |
495 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
496 | struct irq_chip *irqchip, | |
497 | int parent_irq, | |
498 | irq_flow_handler_t parent_handler) | |
499 | { | |
83141a77 LW |
500 | unsigned int offset; |
501 | ||
83141a77 LW |
502 | if (!gpiochip->irqdomain) { |
503 | chip_err(gpiochip, "called %s before setting up irqchip\n", | |
504 | __func__); | |
1c8732bb LW |
505 | return; |
506 | } | |
507 | ||
3f97d5fc LW |
508 | if (parent_handler) { |
509 | if (gpiochip->can_sleep) { | |
510 | chip_err(gpiochip, | |
511 | "you cannot have chained interrupts on a " | |
512 | "chip that may sleep\n"); | |
513 | return; | |
514 | } | |
3f97d5fc LW |
515 | /* |
516 | * The parent irqchip is already using the chip_data for this | |
517 | * irqchip, so our callbacks simply use the handler_data. | |
518 | */ | |
f7f87753 TG |
519 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
520 | gpiochip); | |
25e4fe92 DES |
521 | |
522 | gpiochip->irq_parent = parent_irq; | |
3f97d5fc | 523 | } |
83141a77 LW |
524 | |
525 | /* Set the parent IRQ for all affected IRQs */ | |
526 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
527 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), | |
528 | parent_irq); | |
14250520 LW |
529 | } |
530 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); | |
531 | ||
532 | /** | |
533 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip | |
534 | * @d: the irqdomain used by this irqchip | |
535 | * @irq: the global irq number used by this GPIO irqchip irq | |
536 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip | |
537 | * | |
538 | * This function will set up the mapping for a certain IRQ line on a | |
539 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip | |
540 | * stored inside the gpiochip. | |
541 | */ | |
542 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, | |
543 | irq_hw_number_t hwirq) | |
544 | { | |
545 | struct gpio_chip *chip = d->host_data; | |
546 | ||
14250520 | 547 | irq_set_chip_data(irq, chip); |
a0a8bcf4 GS |
548 | /* |
549 | * This lock class tells lockdep that GPIO irqs are in a different | |
550 | * category than their parents, so it won't report false recursion. | |
551 | */ | |
552 | irq_set_lockdep_class(irq, chip->lock_key); | |
7633fb95 | 553 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
1c8732bb | 554 | /* Chips that can sleep need nested thread handlers */ |
295494af | 555 | if (chip->can_sleep && !chip->irq_not_threaded) |
1c8732bb | 556 | irq_set_nested_thread(irq, 1); |
14250520 | 557 | irq_set_noprobe(irq); |
23393d49 | 558 | |
1333b90f LW |
559 | /* |
560 | * No set-up of the hardware will happen if IRQ_TYPE_NONE | |
561 | * is passed as default type. | |
562 | */ | |
563 | if (chip->irq_default_type != IRQ_TYPE_NONE) | |
564 | irq_set_irq_type(irq, chip->irq_default_type); | |
14250520 LW |
565 | |
566 | return 0; | |
567 | } | |
568 | ||
c3626fde LW |
569 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
570 | { | |
1c8732bb LW |
571 | struct gpio_chip *chip = d->host_data; |
572 | ||
1c8732bb LW |
573 | if (chip->can_sleep) |
574 | irq_set_nested_thread(irq, 0); | |
c3626fde LW |
575 | irq_set_chip_and_handler(irq, NULL, NULL); |
576 | irq_set_chip_data(irq, NULL); | |
577 | } | |
578 | ||
14250520 LW |
579 | static const struct irq_domain_ops gpiochip_domain_ops = { |
580 | .map = gpiochip_irq_map, | |
c3626fde | 581 | .unmap = gpiochip_irq_unmap, |
14250520 LW |
582 | /* Virtually all GPIO irqchips are twocell:ed */ |
583 | .xlate = irq_domain_xlate_twocell, | |
584 | }; | |
585 | ||
586 | static int gpiochip_irq_reqres(struct irq_data *d) | |
587 | { | |
588 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
589 | ||
5b76e79c GS |
590 | if (!try_module_get(chip->owner)) |
591 | return -ENODEV; | |
592 | ||
e3a2e878 | 593 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
14250520 LW |
594 | chip_err(chip, |
595 | "unable to lock HW IRQ %lu for IRQ\n", | |
596 | d->hwirq); | |
5b76e79c | 597 | module_put(chip->owner); |
14250520 LW |
598 | return -EINVAL; |
599 | } | |
600 | return 0; | |
601 | } | |
602 | ||
603 | static void gpiochip_irq_relres(struct irq_data *d) | |
604 | { | |
605 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); | |
606 | ||
e3a2e878 | 607 | gpiochip_unlock_as_irq(chip, d->hwirq); |
5b76e79c | 608 | module_put(chip->owner); |
14250520 LW |
609 | } |
610 | ||
611 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) | |
612 | { | |
613 | return irq_find_mapping(chip->irqdomain, offset); | |
614 | } | |
615 | ||
616 | /** | |
617 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip | |
618 | * @gpiochip: the gpiochip to remove the irqchip from | |
619 | * | |
620 | * This is called only from gpiochip_remove() | |
621 | */ | |
622 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) | |
623 | { | |
c3626fde LW |
624 | unsigned int offset; |
625 | ||
afa82fab MW |
626 | acpi_gpiochip_free_interrupts(gpiochip); |
627 | ||
25e4fe92 DES |
628 | if (gpiochip->irq_parent) { |
629 | irq_set_chained_handler(gpiochip->irq_parent, NULL); | |
630 | irq_set_handler_data(gpiochip->irq_parent, NULL); | |
631 | } | |
632 | ||
c3626fde LW |
633 | /* Remove all IRQ mappings and delete the domain */ |
634 | if (gpiochip->irqdomain) { | |
635 | for (offset = 0; offset < gpiochip->ngpio; offset++) | |
e3893386 GS |
636 | irq_dispose_mapping( |
637 | irq_find_mapping(gpiochip->irqdomain, offset)); | |
14250520 | 638 | irq_domain_remove(gpiochip->irqdomain); |
c3626fde | 639 | } |
14250520 LW |
640 | |
641 | if (gpiochip->irqchip) { | |
642 | gpiochip->irqchip->irq_request_resources = NULL; | |
643 | gpiochip->irqchip->irq_release_resources = NULL; | |
644 | gpiochip->irqchip = NULL; | |
645 | } | |
646 | } | |
647 | ||
648 | /** | |
649 | * gpiochip_irqchip_add() - adds an irqchip to a gpiochip | |
650 | * @gpiochip: the gpiochip to add the irqchip to | |
651 | * @irqchip: the irqchip to add to the gpiochip | |
652 | * @first_irq: if not dynamically assigned, the base (first) IRQ to | |
653 | * allocate gpiochip irqs from | |
654 | * @handler: the irq handler to use (often a predefined irq core function) | |
1333b90f LW |
655 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
656 | * to have the core avoid setting up any default type in the hardware. | |
a0a8bcf4 | 657 | * @lock_key: lockdep class |
14250520 LW |
658 | * |
659 | * This function closely associates a certain irqchip with a certain | |
660 | * gpiochip, providing an irq domain to translate the local IRQs to | |
661 | * global irqs in the gpiolib core, and making sure that the gpiochip | |
662 | * is passed as chip data to all related functions. Driver callbacks | |
663 | * need to use container_of() to get their local state containers back | |
664 | * from the gpiochip passed as chip data. An irqdomain will be stored | |
665 | * in the gpiochip that shall be used by the driver to handle IRQ number | |
666 | * translation. The gpiochip will need to be initialized and registered | |
667 | * before calling this function. | |
668 | * | |
c3626fde LW |
669 | * This function will handle two cell:ed simple IRQs and assumes all |
670 | * the pins on the gpiochip can generate a unique IRQ. Everything else | |
14250520 LW |
671 | * need to be open coded. |
672 | */ | |
a0a8bcf4 GS |
673 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
674 | struct irq_chip *irqchip, | |
675 | unsigned int first_irq, | |
676 | irq_flow_handler_t handler, | |
677 | unsigned int type, | |
678 | struct lock_class_key *lock_key) | |
14250520 LW |
679 | { |
680 | struct device_node *of_node; | |
681 | unsigned int offset; | |
c3626fde | 682 | unsigned irq_base = 0; |
14250520 LW |
683 | |
684 | if (!gpiochip || !irqchip) | |
685 | return -EINVAL; | |
686 | ||
58383c78 | 687 | if (!gpiochip->parent) { |
14250520 LW |
688 | pr_err("missing gpiochip .dev parent pointer\n"); |
689 | return -EINVAL; | |
690 | } | |
58383c78 | 691 | of_node = gpiochip->parent->of_node; |
14250520 LW |
692 | #ifdef CONFIG_OF_GPIO |
693 | /* | |
20a8a968 | 694 | * If the gpiochip has an assigned OF node this takes precedence |
14250520 LW |
695 | * FIXME: get rid of this and use gpiochip->dev->of_node everywhere |
696 | */ | |
697 | if (gpiochip->of_node) | |
698 | of_node = gpiochip->of_node; | |
699 | #endif | |
700 | gpiochip->irqchip = irqchip; | |
701 | gpiochip->irq_handler = handler; | |
702 | gpiochip->irq_default_type = type; | |
703 | gpiochip->to_irq = gpiochip_to_irq; | |
a0a8bcf4 | 704 | gpiochip->lock_key = lock_key; |
14250520 LW |
705 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
706 | gpiochip->ngpio, first_irq, | |
707 | &gpiochip_domain_ops, gpiochip); | |
708 | if (!gpiochip->irqdomain) { | |
709 | gpiochip->irqchip = NULL; | |
710 | return -EINVAL; | |
711 | } | |
8b67a1f0 RV |
712 | |
713 | /* | |
714 | * It is possible for a driver to override this, but only if the | |
715 | * alternative functions are both implemented. | |
716 | */ | |
717 | if (!irqchip->irq_request_resources && | |
718 | !irqchip->irq_release_resources) { | |
719 | irqchip->irq_request_resources = gpiochip_irq_reqres; | |
720 | irqchip->irq_release_resources = gpiochip_irq_relres; | |
721 | } | |
14250520 LW |
722 | |
723 | /* | |
724 | * Prepare the mapping since the irqchip shall be orthogonal to | |
725 | * any gpiochip calls. If the first_irq was zero, this is | |
726 | * necessary to allocate descriptors for all IRQs. | |
727 | */ | |
c3626fde LW |
728 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
729 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); | |
730 | if (offset == 0) | |
731 | /* | |
732 | * Store the base into the gpiochip to be used when | |
733 | * unmapping the irqs. | |
734 | */ | |
735 | gpiochip->irq_base = irq_base; | |
736 | } | |
14250520 | 737 | |
afa82fab MW |
738 | acpi_gpiochip_request_interrupts(gpiochip); |
739 | ||
14250520 LW |
740 | return 0; |
741 | } | |
a0a8bcf4 | 742 | EXPORT_SYMBOL_GPL(_gpiochip_irqchip_add); |
14250520 LW |
743 | |
744 | #else /* CONFIG_GPIOLIB_IRQCHIP */ | |
745 | ||
746 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} | |
747 | ||
748 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ | |
749 | ||
c771c2f4 JG |
750 | /** |
751 | * gpiochip_generic_request() - request the gpio function for a pin | |
752 | * @chip: the gpiochip owning the GPIO | |
753 | * @offset: the offset of the GPIO to request for GPIO function | |
754 | */ | |
755 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) | |
756 | { | |
757 | return pinctrl_request_gpio(chip->base + offset); | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); | |
760 | ||
761 | /** | |
762 | * gpiochip_generic_free() - free the gpio function from a pin | |
763 | * @chip: the gpiochip to request the gpio function for | |
764 | * @offset: the offset of the GPIO to free from GPIO function | |
765 | */ | |
766 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) | |
767 | { | |
768 | pinctrl_free_gpio(chip->base + offset); | |
769 | } | |
770 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); | |
771 | ||
f23f1516 | 772 | #ifdef CONFIG_PINCTRL |
165adc9c | 773 | |
586a87e6 CR |
774 | /** |
775 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping | |
776 | * @chip: the gpiochip to add the range for | |
d32651f6 | 777 | * @pctldev: the pin controller to map to |
586a87e6 CR |
778 | * @gpio_offset: the start offset in the current gpio_chip number space |
779 | * @pin_group: name of the pin group inside the pin controller | |
780 | */ | |
781 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
782 | struct pinctrl_dev *pctldev, | |
783 | unsigned int gpio_offset, const char *pin_group) | |
784 | { | |
785 | struct gpio_pin_range *pin_range; | |
786 | int ret; | |
787 | ||
788 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); | |
789 | if (!pin_range) { | |
1a2a99c6 | 790 | chip_err(chip, "failed to allocate pin ranges\n"); |
586a87e6 CR |
791 | return -ENOMEM; |
792 | } | |
793 | ||
794 | /* Use local offset as range ID */ | |
795 | pin_range->range.id = gpio_offset; | |
796 | pin_range->range.gc = chip; | |
797 | pin_range->range.name = chip->label; | |
798 | pin_range->range.base = chip->base + gpio_offset; | |
799 | pin_range->pctldev = pctldev; | |
800 | ||
801 | ret = pinctrl_get_group_pins(pctldev, pin_group, | |
802 | &pin_range->range.pins, | |
803 | &pin_range->range.npins); | |
61c6375d MN |
804 | if (ret < 0) { |
805 | kfree(pin_range); | |
586a87e6 | 806 | return ret; |
61c6375d | 807 | } |
586a87e6 CR |
808 | |
809 | pinctrl_add_gpio_range(pctldev, &pin_range->range); | |
810 | ||
1a2a99c6 AS |
811 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
812 | gpio_offset, gpio_offset + pin_range->range.npins - 1, | |
586a87e6 CR |
813 | pinctrl_dev_get_devname(pctldev), pin_group); |
814 | ||
815 | list_add_tail(&pin_range->node, &chip->pin_ranges); | |
816 | ||
817 | return 0; | |
818 | } | |
819 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); | |
820 | ||
3f0f8670 LW |
821 | /** |
822 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping | |
823 | * @chip: the gpiochip to add the range for | |
824 | * @pinctrl_name: the dev_name() of the pin controller to map to | |
316511c0 LW |
825 | * @gpio_offset: the start offset in the current gpio_chip number space |
826 | * @pin_offset: the start offset in the pin controller number space | |
3f0f8670 LW |
827 | * @npins: the number of pins from the offset of each pin space (GPIO and |
828 | * pin controller) to accumulate in this range | |
829 | */ | |
1e63d7b9 | 830 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
316511c0 | 831 | unsigned int gpio_offset, unsigned int pin_offset, |
3f0f8670 | 832 | unsigned int npins) |
f23f1516 SH |
833 | { |
834 | struct gpio_pin_range *pin_range; | |
b4d4b1f0 | 835 | int ret; |
f23f1516 | 836 | |
3f0f8670 | 837 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
f23f1516 | 838 | if (!pin_range) { |
1a2a99c6 | 839 | chip_err(chip, "failed to allocate pin ranges\n"); |
1e63d7b9 | 840 | return -ENOMEM; |
f23f1516 SH |
841 | } |
842 | ||
3f0f8670 | 843 | /* Use local offset as range ID */ |
316511c0 | 844 | pin_range->range.id = gpio_offset; |
3f0f8670 | 845 | pin_range->range.gc = chip; |
f23f1516 | 846 | pin_range->range.name = chip->label; |
316511c0 LW |
847 | pin_range->range.base = chip->base + gpio_offset; |
848 | pin_range->range.pin_base = pin_offset; | |
f23f1516 | 849 | pin_range->range.npins = npins; |
192c369c | 850 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
f23f1516 | 851 | &pin_range->range); |
8f23ca1a | 852 | if (IS_ERR(pin_range->pctldev)) { |
b4d4b1f0 | 853 | ret = PTR_ERR(pin_range->pctldev); |
1a2a99c6 | 854 | chip_err(chip, "could not create pin range\n"); |
3f0f8670 | 855 | kfree(pin_range); |
b4d4b1f0 | 856 | return ret; |
3f0f8670 | 857 | } |
1a2a99c6 AS |
858 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
859 | gpio_offset, gpio_offset + npins - 1, | |
316511c0 LW |
860 | pinctl_name, |
861 | pin_offset, pin_offset + npins - 1); | |
f23f1516 SH |
862 | |
863 | list_add_tail(&pin_range->node, &chip->pin_ranges); | |
1e63d7b9 LW |
864 | |
865 | return 0; | |
f23f1516 | 866 | } |
165adc9c | 867 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
f23f1516 | 868 | |
3f0f8670 LW |
869 | /** |
870 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings | |
871 | * @chip: the chip to remove all the mappings for | |
872 | */ | |
f23f1516 SH |
873 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
874 | { | |
875 | struct gpio_pin_range *pin_range, *tmp; | |
876 | ||
877 | list_for_each_entry_safe(pin_range, tmp, &chip->pin_ranges, node) { | |
878 | list_del(&pin_range->node); | |
879 | pinctrl_remove_gpio_range(pin_range->pctldev, | |
880 | &pin_range->range); | |
3f0f8670 | 881 | kfree(pin_range); |
f23f1516 SH |
882 | } |
883 | } | |
165adc9c LW |
884 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
885 | ||
886 | #endif /* CONFIG_PINCTRL */ | |
f23f1516 | 887 | |
d2876d08 DB |
888 | /* These "optional" allocation calls help prevent drivers from stomping |
889 | * on each other, and help provide better diagnostics in debugfs. | |
890 | * They're called even less than the "set direction" calls. | |
891 | */ | |
77c2d792 | 892 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
d2876d08 | 893 | { |
77c2d792 MW |
894 | struct gpio_chip *chip = desc->chip; |
895 | int status; | |
d2876d08 DB |
896 | unsigned long flags; |
897 | ||
bcabdef1 AC |
898 | spin_lock_irqsave(&gpio_lock, flags); |
899 | ||
d2876d08 | 900 | /* NOTE: gpio_request() can be called in early boot, |
35e8bb51 | 901 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
d2876d08 DB |
902 | */ |
903 | ||
904 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { | |
905 | desc_set_label(desc, label ? : "?"); | |
906 | status = 0; | |
438d8908 | 907 | } else { |
d2876d08 | 908 | status = -EBUSY; |
7460db56 | 909 | goto done; |
35e8bb51 DB |
910 | } |
911 | ||
912 | if (chip->request) { | |
913 | /* chip->request may sleep */ | |
914 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 915 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
916 | spin_lock_irqsave(&gpio_lock, flags); |
917 | ||
918 | if (status < 0) { | |
919 | desc_set_label(desc, NULL); | |
35e8bb51 | 920 | clear_bit(FLAG_REQUESTED, &desc->flags); |
80b0a602 | 921 | goto done; |
35e8bb51 | 922 | } |
438d8908 | 923 | } |
80b0a602 MN |
924 | if (chip->get_direction) { |
925 | /* chip->get_direction may sleep */ | |
926 | spin_unlock_irqrestore(&gpio_lock, flags); | |
372e722e | 927 | gpiod_get_direction(desc); |
80b0a602 MN |
928 | spin_lock_irqsave(&gpio_lock, flags); |
929 | } | |
77c2d792 | 930 | done: |
923b93e4 LP |
931 | if (status < 0) { |
932 | /* Clear flags that might have been set by the caller before | |
933 | * requesting the GPIO. | |
934 | */ | |
935 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
936 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
937 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
938 | } | |
77c2d792 MW |
939 | spin_unlock_irqrestore(&gpio_lock, flags); |
940 | return status; | |
941 | } | |
942 | ||
0eb4c6c2 | 943 | int gpiod_request(struct gpio_desc *desc, const char *label) |
77c2d792 MW |
944 | { |
945 | int status = -EPROBE_DEFER; | |
946 | struct gpio_chip *chip; | |
947 | ||
948 | if (!desc) { | |
949 | pr_warn("%s: invalid GPIO\n", __func__); | |
950 | return -EINVAL; | |
951 | } | |
952 | ||
953 | chip = desc->chip; | |
954 | if (!chip) | |
955 | goto done; | |
956 | ||
957 | if (try_module_get(chip->owner)) { | |
958 | status = __gpiod_request(desc, label); | |
959 | if (status < 0) | |
960 | module_put(chip->owner); | |
961 | } | |
962 | ||
d2876d08 DB |
963 | done: |
964 | if (status) | |
7589e59f | 965 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
77c2d792 | 966 | |
d2876d08 DB |
967 | return status; |
968 | } | |
372e722e | 969 | |
77c2d792 | 970 | static bool __gpiod_free(struct gpio_desc *desc) |
d2876d08 | 971 | { |
77c2d792 | 972 | bool ret = false; |
d2876d08 | 973 | unsigned long flags; |
35e8bb51 | 974 | struct gpio_chip *chip; |
d2876d08 | 975 | |
3d599d1c UKK |
976 | might_sleep(); |
977 | ||
372e722e | 978 | gpiod_unexport(desc); |
d8f388d8 | 979 | |
d2876d08 DB |
980 | spin_lock_irqsave(&gpio_lock, flags); |
981 | ||
35e8bb51 DB |
982 | chip = desc->chip; |
983 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { | |
984 | if (chip->free) { | |
985 | spin_unlock_irqrestore(&gpio_lock, flags); | |
9c4ba946 | 986 | might_sleep_if(chip->can_sleep); |
372e722e | 987 | chip->free(chip, gpio_chip_hwgpio(desc)); |
35e8bb51 DB |
988 | spin_lock_irqsave(&gpio_lock, flags); |
989 | } | |
d2876d08 | 990 | desc_set_label(desc, NULL); |
07697461 | 991 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
35e8bb51 | 992 | clear_bit(FLAG_REQUESTED, &desc->flags); |
aca5ce14 | 993 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
25553ff0 | 994 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
f625d460 | 995 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
77c2d792 MW |
996 | ret = true; |
997 | } | |
d2876d08 DB |
998 | |
999 | spin_unlock_irqrestore(&gpio_lock, flags); | |
77c2d792 MW |
1000 | return ret; |
1001 | } | |
1002 | ||
0eb4c6c2 | 1003 | void gpiod_free(struct gpio_desc *desc) |
77c2d792 MW |
1004 | { |
1005 | if (desc && __gpiod_free(desc)) | |
1006 | module_put(desc->chip->owner); | |
1007 | else | |
1008 | WARN_ON(extra_checks); | |
d2876d08 | 1009 | } |
372e722e | 1010 | |
d2876d08 DB |
1011 | /** |
1012 | * gpiochip_is_requested - return string iff signal was requested | |
1013 | * @chip: controller managing the signal | |
1014 | * @offset: of signal within controller's 0..(ngpio - 1) range | |
1015 | * | |
1016 | * Returns NULL if the GPIO is not currently requested, else a string. | |
9c8318ff AC |
1017 | * The string returned is the label passed to gpio_request(); if none has been |
1018 | * passed it is a meaningless, non-NULL constant. | |
d2876d08 DB |
1019 | * |
1020 | * This function is for use by GPIO controller drivers. The label can | |
1021 | * help with diagnostics, and knowing that the signal is used as a GPIO | |
1022 | * can help avoid accidentally multiplexing it to another controller. | |
1023 | */ | |
1024 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) | |
1025 | { | |
6c0b4e6c | 1026 | struct gpio_desc *desc; |
d2876d08 | 1027 | |
48b5953e | 1028 | if (offset >= chip->ngpio) |
d2876d08 | 1029 | return NULL; |
6c0b4e6c AC |
1030 | |
1031 | desc = &chip->desc[offset]; | |
1032 | ||
372e722e | 1033 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
d2876d08 | 1034 | return NULL; |
372e722e | 1035 | return desc->label; |
d2876d08 DB |
1036 | } |
1037 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); | |
1038 | ||
77c2d792 MW |
1039 | /** |
1040 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor | |
1041 | * @desc: GPIO descriptor to request | |
1042 | * @label: label for the GPIO | |
1043 | * | |
1044 | * Function allows GPIO chip drivers to request and use their own GPIO | |
1045 | * descriptors via gpiolib API. Difference to gpiod_request() is that this | |
1046 | * function will not increase reference count of the GPIO chip module. This | |
1047 | * allows the GPIO chip module to be unloaded as needed (we assume that the | |
1048 | * GPIO chip driver handles freeing the GPIOs it has requested). | |
1049 | */ | |
abdc08a3 AC |
1050 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
1051 | const char *label) | |
77c2d792 | 1052 | { |
abdc08a3 AC |
1053 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
1054 | int err; | |
77c2d792 | 1055 | |
abdc08a3 AC |
1056 | if (IS_ERR(desc)) { |
1057 | chip_err(chip, "failed to get GPIO descriptor\n"); | |
1058 | return desc; | |
1059 | } | |
1060 | ||
1061 | err = __gpiod_request(desc, label); | |
1062 | if (err < 0) | |
1063 | return ERR_PTR(err); | |
77c2d792 | 1064 | |
abdc08a3 | 1065 | return desc; |
77c2d792 | 1066 | } |
f7d4ad98 | 1067 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
77c2d792 MW |
1068 | |
1069 | /** | |
1070 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver | |
1071 | * @desc: GPIO descriptor to free | |
1072 | * | |
1073 | * Function frees the given GPIO requested previously with | |
1074 | * gpiochip_request_own_desc(). | |
1075 | */ | |
1076 | void gpiochip_free_own_desc(struct gpio_desc *desc) | |
1077 | { | |
1078 | if (desc) | |
1079 | __gpiod_free(desc); | |
1080 | } | |
f7d4ad98 | 1081 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
d2876d08 DB |
1082 | |
1083 | /* Drivers MUST set GPIO direction before making get/set calls. In | |
1084 | * some cases this is done in early boot, before IRQs are enabled. | |
1085 | * | |
1086 | * As a rule these aren't called more than once (except for drivers | |
1087 | * using the open-drain emulation idiom) so these are natural places | |
1088 | * to accumulate extra debugging checks. Note that we can't (yet) | |
1089 | * rely on gpio_request() having been called beforehand. | |
1090 | */ | |
1091 | ||
79a9becd AC |
1092 | /** |
1093 | * gpiod_direction_input - set the GPIO direction to input | |
1094 | * @desc: GPIO to set to input | |
1095 | * | |
1096 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can | |
1097 | * be called safely on it. | |
1098 | * | |
1099 | * Return 0 in case of success, else an error code. | |
1100 | */ | |
1101 | int gpiod_direction_input(struct gpio_desc *desc) | |
d2876d08 | 1102 | { |
d2876d08 | 1103 | struct gpio_chip *chip; |
d2876d08 DB |
1104 | int status = -EINVAL; |
1105 | ||
be1a4b13 | 1106 | if (!desc || !desc->chip) { |
bcabdef1 AC |
1107 | pr_warn("%s: invalid GPIO\n", __func__); |
1108 | return -EINVAL; | |
1109 | } | |
1110 | ||
be1a4b13 LW |
1111 | chip = desc->chip; |
1112 | if (!chip->get || !chip->direction_input) { | |
6424de5a MB |
1113 | gpiod_warn(desc, |
1114 | "%s: missing get() or direction_input() operations\n", | |
7589e59f | 1115 | __func__); |
be1a4b13 LW |
1116 | return -EIO; |
1117 | } | |
1118 | ||
d82da797 | 1119 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
d2876d08 DB |
1120 | if (status == 0) |
1121 | clear_bit(FLAG_IS_OUT, &desc->flags); | |
3f397c21 | 1122 | |
372e722e | 1123 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
d82da797 | 1124 | |
d2876d08 DB |
1125 | return status; |
1126 | } | |
79a9becd | 1127 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
372e722e | 1128 | |
ef70bbe1 | 1129 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
d2876d08 | 1130 | { |
d2876d08 | 1131 | struct gpio_chip *chip; |
d2876d08 DB |
1132 | int status = -EINVAL; |
1133 | ||
d468bf9e LW |
1134 | /* GPIOs used for IRQs shall not be set as output */ |
1135 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { | |
1136 | gpiod_err(desc, | |
1137 | "%s: tried to set a GPIO tied to an IRQ as output\n", | |
1138 | __func__); | |
1139 | return -EIO; | |
1140 | } | |
1141 | ||
aca5ce14 LD |
1142 | /* Open drain pin should not be driven to 1 */ |
1143 | if (value && test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
372e722e | 1144 | return gpiod_direction_input(desc); |
aca5ce14 | 1145 | |
25553ff0 LD |
1146 | /* Open source pin should not be driven to 0 */ |
1147 | if (!value && test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
372e722e | 1148 | return gpiod_direction_input(desc); |
25553ff0 | 1149 | |
be1a4b13 LW |
1150 | chip = desc->chip; |
1151 | if (!chip->set || !chip->direction_output) { | |
6424de5a MB |
1152 | gpiod_warn(desc, |
1153 | "%s: missing set() or direction_output() operations\n", | |
1154 | __func__); | |
be1a4b13 LW |
1155 | return -EIO; |
1156 | } | |
1157 | ||
d82da797 | 1158 | status = chip->direction_output(chip, gpio_chip_hwgpio(desc), value); |
d2876d08 DB |
1159 | if (status == 0) |
1160 | set_bit(FLAG_IS_OUT, &desc->flags); | |
372e722e AC |
1161 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1162 | trace_gpio_direction(desc_to_gpio(desc), 0, status); | |
d2876d08 DB |
1163 | return status; |
1164 | } | |
ef70bbe1 PZ |
1165 | |
1166 | /** | |
1167 | * gpiod_direction_output_raw - set the GPIO direction to output | |
1168 | * @desc: GPIO to set to output | |
1169 | * @value: initial output value of the GPIO | |
1170 | * | |
1171 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1172 | * be called safely on it. The initial value of the output must be specified | |
1173 | * as raw value on the physical line without regard for the ACTIVE_LOW status. | |
1174 | * | |
1175 | * Return 0 in case of success, else an error code. | |
1176 | */ | |
1177 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) | |
1178 | { | |
1179 | if (!desc || !desc->chip) { | |
1180 | pr_warn("%s: invalid GPIO\n", __func__); | |
1181 | return -EINVAL; | |
1182 | } | |
1183 | return _gpiod_direction_output_raw(desc, value); | |
1184 | } | |
1185 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); | |
1186 | ||
1187 | /** | |
90df4fe0 | 1188 | * gpiod_direction_output - set the GPIO direction to output |
ef70bbe1 PZ |
1189 | * @desc: GPIO to set to output |
1190 | * @value: initial output value of the GPIO | |
1191 | * | |
1192 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can | |
1193 | * be called safely on it. The initial value of the output must be specified | |
1194 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1195 | * account. | |
1196 | * | |
1197 | * Return 0 in case of success, else an error code. | |
1198 | */ | |
1199 | int gpiod_direction_output(struct gpio_desc *desc, int value) | |
1200 | { | |
1201 | if (!desc || !desc->chip) { | |
1202 | pr_warn("%s: invalid GPIO\n", __func__); | |
1203 | return -EINVAL; | |
1204 | } | |
1205 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1206 | value = !value; | |
1207 | return _gpiod_direction_output_raw(desc, value); | |
1208 | } | |
79a9becd | 1209 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
d2876d08 | 1210 | |
c4b5be98 | 1211 | /** |
79a9becd | 1212 | * gpiod_set_debounce - sets @debounce time for a @gpio |
c4b5be98 FB |
1213 | * @gpio: the gpio to set debounce time |
1214 | * @debounce: debounce time is microseconds | |
65d87656 LW |
1215 | * |
1216 | * returns -ENOTSUPP if the controller does not support setting | |
1217 | * debounce. | |
c4b5be98 | 1218 | */ |
79a9becd | 1219 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
c4b5be98 | 1220 | { |
c4b5be98 | 1221 | struct gpio_chip *chip; |
c4b5be98 | 1222 | |
be1a4b13 | 1223 | if (!desc || !desc->chip) { |
bcabdef1 AC |
1224 | pr_warn("%s: invalid GPIO\n", __func__); |
1225 | return -EINVAL; | |
1226 | } | |
1227 | ||
c4b5be98 | 1228 | chip = desc->chip; |
be1a4b13 | 1229 | if (!chip->set || !chip->set_debounce) { |
6424de5a MB |
1230 | gpiod_dbg(desc, |
1231 | "%s: missing set() or set_debounce() operations\n", | |
1232 | __func__); | |
65d87656 | 1233 | return -ENOTSUPP; |
be1a4b13 LW |
1234 | } |
1235 | ||
d82da797 | 1236 | return chip->set_debounce(chip, gpio_chip_hwgpio(desc), debounce); |
c4b5be98 | 1237 | } |
79a9becd | 1238 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
372e722e | 1239 | |
79a9becd AC |
1240 | /** |
1241 | * gpiod_is_active_low - test whether a GPIO is active-low or not | |
1242 | * @desc: the gpio descriptor to test | |
1243 | * | |
1244 | * Returns 1 if the GPIO is active-low, 0 otherwise. | |
1245 | */ | |
1246 | int gpiod_is_active_low(const struct gpio_desc *desc) | |
372e722e | 1247 | { |
79a9becd | 1248 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
372e722e | 1249 | } |
79a9becd | 1250 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
d2876d08 DB |
1251 | |
1252 | /* I/O calls are only valid after configuration completed; the relevant | |
1253 | * "is this a valid GPIO" error checks should already have been done. | |
1254 | * | |
1255 | * "Get" operations are often inlinable as reading a pin value register, | |
1256 | * and masking the relevant bit in that register. | |
1257 | * | |
1258 | * When "set" operations are inlinable, they involve writing that mask to | |
1259 | * one register to set a low value, or a different register to set it high. | |
1260 | * Otherwise locking is needed, so there may be little value to inlining. | |
1261 | * | |
1262 | *------------------------------------------------------------------------ | |
1263 | * | |
1264 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers | |
1265 | * have requested the GPIO. That can include implicit requesting by | |
1266 | * a direction setting call. Marking a gpio as requested locks its chip | |
1267 | * in memory, guaranteeing that these table lookups need no more locking | |
1268 | * and that gpiochip_remove() will fail. | |
1269 | * | |
1270 | * REVISIT when debugging, consider adding some instrumentation to ensure | |
1271 | * that the GPIO was actually requested. | |
1272 | */ | |
1273 | ||
e20538b8 | 1274 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 DB |
1275 | { |
1276 | struct gpio_chip *chip; | |
372e722e | 1277 | int offset; |
e20538b8 | 1278 | int value; |
d2876d08 | 1279 | |
372e722e AC |
1280 | chip = desc->chip; |
1281 | offset = gpio_chip_hwgpio(desc); | |
e20538b8 BA |
1282 | value = chip->get ? chip->get(chip, offset) : -EIO; |
1283 | value = value < 0 ? value : !!value; | |
372e722e | 1284 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
3f397c21 | 1285 | return value; |
d2876d08 | 1286 | } |
372e722e | 1287 | |
d2876d08 | 1288 | /** |
79a9becd AC |
1289 | * gpiod_get_raw_value() - return a gpio's raw value |
1290 | * @desc: gpio whose value will be returned | |
d2876d08 | 1291 | * |
79a9becd | 1292 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
e20538b8 | 1293 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1294 | * |
1295 | * This function should be called from contexts where we cannot sleep, and will | |
1296 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1297 | */ |
79a9becd | 1298 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
d2876d08 | 1299 | { |
bcabdef1 AC |
1300 | if (!desc) |
1301 | return 0; | |
e4e449e8 | 1302 | /* Should be using gpio_get_value_cansleep() */ |
d8e0ac08 | 1303 | WARN_ON(desc->chip->can_sleep); |
79a9becd | 1304 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1305 | } |
79a9becd | 1306 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
372e722e | 1307 | |
79a9becd AC |
1308 | /** |
1309 | * gpiod_get_value() - return a gpio's value | |
1310 | * @desc: gpio whose value will be returned | |
1311 | * | |
1312 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1313 | * account, or negative errno on failure. |
79a9becd AC |
1314 | * |
1315 | * This function should be called from contexts where we cannot sleep, and will | |
1316 | * complain if the GPIO chip functions potentially sleep. | |
1317 | */ | |
1318 | int gpiod_get_value(const struct gpio_desc *desc) | |
372e722e | 1319 | { |
79a9becd AC |
1320 | int value; |
1321 | if (!desc) | |
1322 | return 0; | |
1323 | /* Should be using gpio_get_value_cansleep() */ | |
1324 | WARN_ON(desc->chip->can_sleep); | |
1325 | ||
1326 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1327 | if (value < 0) |
1328 | return value; | |
1329 | ||
79a9becd AC |
1330 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1331 | value = !value; | |
1332 | ||
1333 | return value; | |
372e722e | 1334 | } |
79a9becd | 1335 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
d2876d08 | 1336 | |
aca5ce14 LD |
1337 | /* |
1338 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. | |
79a9becd | 1339 | * @desc: gpio descriptor whose state need to be set. |
20a8a968 | 1340 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
aca5ce14 | 1341 | */ |
23600969 | 1342 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
aca5ce14 LD |
1343 | { |
1344 | int err = 0; | |
372e722e AC |
1345 | struct gpio_chip *chip = desc->chip; |
1346 | int offset = gpio_chip_hwgpio(desc); | |
1347 | ||
aca5ce14 | 1348 | if (value) { |
372e722e | 1349 | err = chip->direction_input(chip, offset); |
aca5ce14 | 1350 | if (!err) |
372e722e | 1351 | clear_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1352 | } else { |
372e722e | 1353 | err = chip->direction_output(chip, offset, 0); |
aca5ce14 | 1354 | if (!err) |
372e722e | 1355 | set_bit(FLAG_IS_OUT, &desc->flags); |
aca5ce14 | 1356 | } |
372e722e | 1357 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
aca5ce14 | 1358 | if (err < 0) |
6424de5a MB |
1359 | gpiod_err(desc, |
1360 | "%s: Error in set_value for open drain err %d\n", | |
1361 | __func__, err); | |
aca5ce14 LD |
1362 | } |
1363 | ||
25553ff0 | 1364 | /* |
79a9becd AC |
1365 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
1366 | * @desc: gpio descriptor whose state need to be set. | |
20a8a968 | 1367 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
25553ff0 | 1368 | */ |
23600969 | 1369 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
25553ff0 LD |
1370 | { |
1371 | int err = 0; | |
372e722e AC |
1372 | struct gpio_chip *chip = desc->chip; |
1373 | int offset = gpio_chip_hwgpio(desc); | |
1374 | ||
25553ff0 | 1375 | if (value) { |
372e722e | 1376 | err = chip->direction_output(chip, offset, 1); |
25553ff0 | 1377 | if (!err) |
372e722e | 1378 | set_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1379 | } else { |
372e722e | 1380 | err = chip->direction_input(chip, offset); |
25553ff0 | 1381 | if (!err) |
372e722e | 1382 | clear_bit(FLAG_IS_OUT, &desc->flags); |
25553ff0 | 1383 | } |
372e722e | 1384 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
25553ff0 | 1385 | if (err < 0) |
6424de5a MB |
1386 | gpiod_err(desc, |
1387 | "%s: Error in set_value for open source err %d\n", | |
1388 | __func__, err); | |
25553ff0 LD |
1389 | } |
1390 | ||
23600969 | 1391 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
d2876d08 DB |
1392 | { |
1393 | struct gpio_chip *chip; | |
1394 | ||
372e722e | 1395 | chip = desc->chip; |
372e722e AC |
1396 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
1397 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) | |
1398 | _gpio_set_open_drain_value(desc, value); | |
1399 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) | |
1400 | _gpio_set_open_source_value(desc, value); | |
aca5ce14 | 1401 | else |
372e722e AC |
1402 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
1403 | } | |
1404 | ||
5f424243 RI |
1405 | /* |
1406 | * set multiple outputs on the same chip; | |
1407 | * use the chip's set_multiple function if available; | |
1408 | * otherwise set the outputs sequentially; | |
1409 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word | |
1410 | * defines which outputs are to be changed | |
1411 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word | |
1412 | * defines the values the outputs specified by mask are to be set to | |
1413 | */ | |
1414 | static void gpio_chip_set_multiple(struct gpio_chip *chip, | |
1415 | unsigned long *mask, unsigned long *bits) | |
1416 | { | |
1417 | if (chip->set_multiple) { | |
1418 | chip->set_multiple(chip, mask, bits); | |
1419 | } else { | |
1420 | int i; | |
1421 | for (i = 0; i < chip->ngpio; i++) { | |
1422 | if (mask[BIT_WORD(i)] == 0) { | |
1423 | /* no more set bits in this mask word; | |
1424 | * skip ahead to the next word */ | |
1425 | i = (BIT_WORD(i) + 1) * BITS_PER_LONG - 1; | |
1426 | continue; | |
1427 | } | |
1428 | /* set outputs if the corresponding mask bit is set */ | |
38e003f4 | 1429 | if (__test_and_clear_bit(i, mask)) |
5f424243 | 1430 | chip->set(chip, i, test_bit(i, bits)); |
5f424243 RI |
1431 | } |
1432 | } | |
1433 | } | |
1434 | ||
3fff99bc RI |
1435 | static void gpiod_set_array_value_priv(bool raw, bool can_sleep, |
1436 | unsigned int array_size, | |
1437 | struct gpio_desc **desc_array, | |
1438 | int *value_array) | |
5f424243 RI |
1439 | { |
1440 | int i = 0; | |
1441 | ||
1442 | while (i < array_size) { | |
1443 | struct gpio_chip *chip = desc_array[i]->chip; | |
1444 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; | |
1445 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; | |
1446 | int count = 0; | |
1447 | ||
38e003f4 | 1448 | if (!can_sleep) |
5f424243 | 1449 | WARN_ON(chip->can_sleep); |
38e003f4 | 1450 | |
5f424243 RI |
1451 | memset(mask, 0, sizeof(mask)); |
1452 | do { | |
1453 | struct gpio_desc *desc = desc_array[i]; | |
1454 | int hwgpio = gpio_chip_hwgpio(desc); | |
1455 | int value = value_array[i]; | |
1456 | ||
1457 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1458 | value = !value; | |
1459 | trace_gpio_value(desc_to_gpio(desc), 0, value); | |
1460 | /* | |
1461 | * collect all normal outputs belonging to the same chip | |
1462 | * open drain and open source outputs are set individually | |
1463 | */ | |
1464 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { | |
38e003f4 | 1465 | _gpio_set_open_drain_value(desc, value); |
5f424243 RI |
1466 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
1467 | _gpio_set_open_source_value(desc, value); | |
1468 | } else { | |
1469 | __set_bit(hwgpio, mask); | |
38e003f4 | 1470 | if (value) |
5f424243 | 1471 | __set_bit(hwgpio, bits); |
38e003f4 | 1472 | else |
5f424243 | 1473 | __clear_bit(hwgpio, bits); |
5f424243 RI |
1474 | count++; |
1475 | } | |
1476 | i++; | |
1477 | } while ((i < array_size) && (desc_array[i]->chip == chip)); | |
1478 | /* push collected bits to outputs */ | |
38e003f4 | 1479 | if (count != 0) |
5f424243 | 1480 | gpio_chip_set_multiple(chip, mask, bits); |
5f424243 RI |
1481 | } |
1482 | } | |
1483 | ||
d2876d08 | 1484 | /** |
79a9becd AC |
1485 | * gpiod_set_raw_value() - assign a gpio's raw value |
1486 | * @desc: gpio whose value will be assigned | |
d2876d08 | 1487 | * @value: value to assign |
d2876d08 | 1488 | * |
79a9becd AC |
1489 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
1490 | * regard for its ACTIVE_LOW status. | |
1491 | * | |
1492 | * This function should be called from contexts where we cannot sleep, and will | |
1493 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1494 | */ |
79a9becd | 1495 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
372e722e | 1496 | { |
bcabdef1 AC |
1497 | if (!desc) |
1498 | return; | |
e4e449e8 | 1499 | /* Should be using gpio_set_value_cansleep() */ |
d8e0ac08 | 1500 | WARN_ON(desc->chip->can_sleep); |
79a9becd | 1501 | _gpiod_set_raw_value(desc, value); |
d2876d08 | 1502 | } |
79a9becd | 1503 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
d2876d08 DB |
1504 | |
1505 | /** | |
79a9becd AC |
1506 | * gpiod_set_value() - assign a gpio's value |
1507 | * @desc: gpio whose value will be assigned | |
1508 | * @value: value to assign | |
1509 | * | |
1510 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1511 | * account | |
d2876d08 | 1512 | * |
79a9becd AC |
1513 | * This function should be called from contexts where we cannot sleep, and will |
1514 | * complain if the GPIO chip functions potentially sleep. | |
d2876d08 | 1515 | */ |
79a9becd | 1516 | void gpiod_set_value(struct gpio_desc *desc, int value) |
d2876d08 | 1517 | { |
bcabdef1 | 1518 | if (!desc) |
79a9becd AC |
1519 | return; |
1520 | /* Should be using gpio_set_value_cansleep() */ | |
1521 | WARN_ON(desc->chip->can_sleep); | |
1522 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1523 | value = !value; | |
1524 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1525 | } |
79a9becd | 1526 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
d2876d08 | 1527 | |
5f424243 | 1528 | /** |
3fff99bc | 1529 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1530 | * @array_size: number of elements in the descriptor / value arrays |
1531 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1532 | * @value_array: array of values to assign | |
1533 | * | |
1534 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1535 | * without regard for their ACTIVE_LOW status. | |
1536 | * | |
1537 | * This function should be called from contexts where we cannot sleep, and will | |
1538 | * complain if the GPIO chip functions potentially sleep. | |
1539 | */ | |
3fff99bc | 1540 | void gpiod_set_raw_array_value(unsigned int array_size, |
5f424243 RI |
1541 | struct gpio_desc **desc_array, int *value_array) |
1542 | { | |
1543 | if (!desc_array) | |
1544 | return; | |
3fff99bc RI |
1545 | gpiod_set_array_value_priv(true, false, array_size, desc_array, |
1546 | value_array); | |
5f424243 | 1547 | } |
3fff99bc | 1548 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
5f424243 RI |
1549 | |
1550 | /** | |
3fff99bc | 1551 | * gpiod_set_array_value() - assign values to an array of GPIOs |
5f424243 RI |
1552 | * @array_size: number of elements in the descriptor / value arrays |
1553 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1554 | * @value_array: array of values to assign | |
1555 | * | |
1556 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
1557 | * into account. | |
1558 | * | |
1559 | * This function should be called from contexts where we cannot sleep, and will | |
1560 | * complain if the GPIO chip functions potentially sleep. | |
1561 | */ | |
3fff99bc RI |
1562 | void gpiod_set_array_value(unsigned int array_size, |
1563 | struct gpio_desc **desc_array, int *value_array) | |
5f424243 RI |
1564 | { |
1565 | if (!desc_array) | |
1566 | return; | |
3fff99bc RI |
1567 | gpiod_set_array_value_priv(false, false, array_size, desc_array, |
1568 | value_array); | |
5f424243 | 1569 | } |
3fff99bc | 1570 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
5f424243 | 1571 | |
d2876d08 | 1572 | /** |
79a9becd AC |
1573 | * gpiod_cansleep() - report whether gpio value access may sleep |
1574 | * @desc: gpio to check | |
d2876d08 | 1575 | * |
d2876d08 | 1576 | */ |
79a9becd | 1577 | int gpiod_cansleep(const struct gpio_desc *desc) |
372e722e | 1578 | { |
bcabdef1 AC |
1579 | if (!desc) |
1580 | return 0; | |
372e722e | 1581 | return desc->chip->can_sleep; |
d2876d08 | 1582 | } |
79a9becd | 1583 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
d2876d08 | 1584 | |
0f6d504e | 1585 | /** |
79a9becd AC |
1586 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
1587 | * @desc: gpio whose IRQ will be returned (already requested) | |
0f6d504e | 1588 | * |
79a9becd AC |
1589 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
1590 | * error. | |
0f6d504e | 1591 | */ |
79a9becd | 1592 | int gpiod_to_irq(const struct gpio_desc *desc) |
0f6d504e DB |
1593 | { |
1594 | struct gpio_chip *chip; | |
372e722e | 1595 | int offset; |
0f6d504e | 1596 | |
bcabdef1 AC |
1597 | if (!desc) |
1598 | return -EINVAL; | |
372e722e AC |
1599 | chip = desc->chip; |
1600 | offset = gpio_chip_hwgpio(desc); | |
1601 | return chip->to_irq ? chip->to_irq(chip, offset) : -ENXIO; | |
0f6d504e | 1602 | } |
79a9becd | 1603 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
0f6d504e | 1604 | |
d468bf9e | 1605 | /** |
e3a2e878 | 1606 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
d74be6df AC |
1607 | * @chip: the chip the GPIO to lock belongs to |
1608 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1609 | * |
1610 | * This is used directly by GPIO drivers that want to lock down | |
f438acdf | 1611 | * a certain GPIO line to be used for IRQs. |
d468bf9e | 1612 | */ |
e3a2e878 | 1613 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
372e722e | 1614 | { |
d74be6df | 1615 | if (offset >= chip->ngpio) |
d468bf9e LW |
1616 | return -EINVAL; |
1617 | ||
d74be6df AC |
1618 | if (test_bit(FLAG_IS_OUT, &chip->desc[offset].flags)) { |
1619 | chip_err(chip, | |
d468bf9e LW |
1620 | "%s: tried to flag a GPIO set as output for IRQ\n", |
1621 | __func__); | |
1622 | return -EIO; | |
1623 | } | |
1624 | ||
d74be6df | 1625 | set_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags); |
d468bf9e | 1626 | return 0; |
372e722e | 1627 | } |
e3a2e878 | 1628 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
d2876d08 | 1629 | |
d468bf9e | 1630 | /** |
e3a2e878 | 1631 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
d74be6df AC |
1632 | * @chip: the chip the GPIO to lock belongs to |
1633 | * @offset: the offset of the GPIO to lock as IRQ | |
d468bf9e LW |
1634 | * |
1635 | * This is used directly by GPIO drivers that want to indicate | |
1636 | * that a certain GPIO is no longer used exclusively for IRQ. | |
d2876d08 | 1637 | */ |
e3a2e878 | 1638 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
d468bf9e | 1639 | { |
d74be6df | 1640 | if (offset >= chip->ngpio) |
d468bf9e | 1641 | return; |
d2876d08 | 1642 | |
d74be6df | 1643 | clear_bit(FLAG_USED_AS_IRQ, &chip->desc[offset].flags); |
d468bf9e | 1644 | } |
e3a2e878 | 1645 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
d468bf9e | 1646 | |
79a9becd AC |
1647 | /** |
1648 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value | |
1649 | * @desc: gpio whose value will be returned | |
1650 | * | |
1651 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding | |
e20538b8 | 1652 | * its ACTIVE_LOW status, or negative errno on failure. |
79a9becd AC |
1653 | * |
1654 | * This function is to be called from contexts that can sleep. | |
d2876d08 | 1655 | */ |
79a9becd | 1656 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
d2876d08 | 1657 | { |
d2876d08 | 1658 | might_sleep_if(extra_checks); |
bcabdef1 AC |
1659 | if (!desc) |
1660 | return 0; | |
79a9becd | 1661 | return _gpiod_get_raw_value(desc); |
d2876d08 | 1662 | } |
79a9becd | 1663 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
372e722e | 1664 | |
79a9becd AC |
1665 | /** |
1666 | * gpiod_get_value_cansleep() - return a gpio's value | |
1667 | * @desc: gpio whose value will be returned | |
1668 | * | |
1669 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into | |
e20538b8 | 1670 | * account, or negative errno on failure. |
79a9becd AC |
1671 | * |
1672 | * This function is to be called from contexts that can sleep. | |
1673 | */ | |
1674 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) | |
d2876d08 | 1675 | { |
3f397c21 | 1676 | int value; |
d2876d08 DB |
1677 | |
1678 | might_sleep_if(extra_checks); | |
bcabdef1 AC |
1679 | if (!desc) |
1680 | return 0; | |
79a9becd AC |
1681 | |
1682 | value = _gpiod_get_raw_value(desc); | |
e20538b8 BA |
1683 | if (value < 0) |
1684 | return value; | |
1685 | ||
79a9becd AC |
1686 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
1687 | value = !value; | |
1688 | ||
3f397c21 | 1689 | return value; |
d2876d08 | 1690 | } |
79a9becd | 1691 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
372e722e | 1692 | |
79a9becd AC |
1693 | /** |
1694 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value | |
1695 | * @desc: gpio whose value will be assigned | |
1696 | * @value: value to assign | |
1697 | * | |
1698 | * Set the raw value of the GPIO, i.e. the value of its physical line without | |
1699 | * regard for its ACTIVE_LOW status. | |
1700 | * | |
1701 | * This function is to be called from contexts that can sleep. | |
1702 | */ | |
1703 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) | |
372e722e | 1704 | { |
d2876d08 | 1705 | might_sleep_if(extra_checks); |
bcabdef1 AC |
1706 | if (!desc) |
1707 | return; | |
79a9becd | 1708 | _gpiod_set_raw_value(desc, value); |
372e722e | 1709 | } |
79a9becd | 1710 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
d2876d08 | 1711 | |
79a9becd AC |
1712 | /** |
1713 | * gpiod_set_value_cansleep() - assign a gpio's value | |
1714 | * @desc: gpio whose value will be assigned | |
1715 | * @value: value to assign | |
1716 | * | |
1717 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into | |
1718 | * account | |
1719 | * | |
1720 | * This function is to be called from contexts that can sleep. | |
1721 | */ | |
1722 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) | |
d2876d08 | 1723 | { |
d2876d08 | 1724 | might_sleep_if(extra_checks); |
bcabdef1 AC |
1725 | if (!desc) |
1726 | return; | |
79a9becd AC |
1727 | |
1728 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) | |
1729 | value = !value; | |
1730 | _gpiod_set_raw_value(desc, value); | |
372e722e | 1731 | } |
79a9becd | 1732 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
d2876d08 | 1733 | |
5f424243 | 1734 | /** |
3fff99bc | 1735 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
1736 | * @array_size: number of elements in the descriptor / value arrays |
1737 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1738 | * @value_array: array of values to assign | |
1739 | * | |
1740 | * Set the raw values of the GPIOs, i.e. the values of the physical lines | |
1741 | * without regard for their ACTIVE_LOW status. | |
1742 | * | |
1743 | * This function is to be called from contexts that can sleep. | |
1744 | */ | |
3fff99bc RI |
1745 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
1746 | struct gpio_desc **desc_array, | |
1747 | int *value_array) | |
5f424243 RI |
1748 | { |
1749 | might_sleep_if(extra_checks); | |
1750 | if (!desc_array) | |
1751 | return; | |
3fff99bc RI |
1752 | gpiod_set_array_value_priv(true, true, array_size, desc_array, |
1753 | value_array); | |
5f424243 | 1754 | } |
3fff99bc | 1755 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
5f424243 RI |
1756 | |
1757 | /** | |
3fff99bc | 1758 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
5f424243 RI |
1759 | * @array_size: number of elements in the descriptor / value arrays |
1760 | * @desc_array: array of GPIO descriptors whose values will be assigned | |
1761 | * @value_array: array of values to assign | |
1762 | * | |
1763 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status | |
1764 | * into account. | |
1765 | * | |
1766 | * This function is to be called from contexts that can sleep. | |
1767 | */ | |
3fff99bc RI |
1768 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
1769 | struct gpio_desc **desc_array, | |
1770 | int *value_array) | |
5f424243 RI |
1771 | { |
1772 | might_sleep_if(extra_checks); | |
1773 | if (!desc_array) | |
1774 | return; | |
3fff99bc RI |
1775 | gpiod_set_array_value_priv(false, true, array_size, desc_array, |
1776 | value_array); | |
5f424243 | 1777 | } |
3fff99bc | 1778 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
5f424243 | 1779 | |
bae48da2 | 1780 | /** |
ad824783 AC |
1781 | * gpiod_add_lookup_table() - register GPIO device consumers |
1782 | * @table: table of consumers to register | |
bae48da2 | 1783 | */ |
ad824783 | 1784 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
bae48da2 AC |
1785 | { |
1786 | mutex_lock(&gpio_lookup_lock); | |
1787 | ||
ad824783 | 1788 | list_add_tail(&table->list, &gpio_lookup_list); |
bae48da2 AC |
1789 | |
1790 | mutex_unlock(&gpio_lookup_lock); | |
1791 | } | |
1792 | ||
be9015ab SK |
1793 | /** |
1794 | * gpiod_remove_lookup_table() - unregister GPIO device consumers | |
1795 | * @table: table of consumers to unregister | |
1796 | */ | |
1797 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) | |
1798 | { | |
1799 | mutex_lock(&gpio_lookup_lock); | |
1800 | ||
1801 | list_del(&table->list); | |
1802 | ||
1803 | mutex_unlock(&gpio_lookup_lock); | |
1804 | } | |
1805 | ||
bae48da2 | 1806 | static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
1807 | unsigned int idx, |
1808 | enum gpio_lookup_flags *flags) | |
bae48da2 AC |
1809 | { |
1810 | char prop_name[32]; /* 32 is max size of property name */ | |
1811 | enum of_gpio_flags of_flags; | |
1812 | struct gpio_desc *desc; | |
dd34c37a | 1813 | unsigned int i; |
bae48da2 | 1814 | |
7f2e553a | 1815 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
dd34c37a | 1816 | if (con_id) |
9e089246 | 1817 | snprintf(prop_name, sizeof(prop_name), "%s-%s", con_id, |
7f2e553a | 1818 | gpio_suffixes[i]); |
dd34c37a | 1819 | else |
9e089246 | 1820 | snprintf(prop_name, sizeof(prop_name), "%s", |
7f2e553a | 1821 | gpio_suffixes[i]); |
bae48da2 | 1822 | |
dd34c37a TR |
1823 | desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx, |
1824 | &of_flags); | |
06fc3b70 | 1825 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) |
dd34c37a TR |
1826 | break; |
1827 | } | |
bae48da2 AC |
1828 | |
1829 | if (IS_ERR(desc)) | |
1830 | return desc; | |
1831 | ||
1832 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
53e7cac3 | 1833 | *flags |= GPIO_ACTIVE_LOW; |
bae48da2 | 1834 | |
90b665f6 LP |
1835 | if (of_flags & OF_GPIO_SINGLE_ENDED) { |
1836 | if (of_flags & OF_GPIO_ACTIVE_LOW) | |
1837 | *flags |= GPIO_OPEN_DRAIN; | |
1838 | else | |
1839 | *flags |= GPIO_OPEN_SOURCE; | |
1840 | } | |
1841 | ||
bae48da2 AC |
1842 | return desc; |
1843 | } | |
d2876d08 | 1844 | |
81f59e9d | 1845 | static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id, |
53e7cac3 AC |
1846 | unsigned int idx, |
1847 | enum gpio_lookup_flags *flags) | |
372e722e | 1848 | { |
0d9a693c | 1849 | struct acpi_device *adev = ACPI_COMPANION(dev); |
e01f440a MW |
1850 | struct acpi_gpio_info info; |
1851 | struct gpio_desc *desc; | |
0d9a693c MW |
1852 | char propname[32]; |
1853 | int i; | |
e01f440a | 1854 | |
0d9a693c | 1855 | /* Try first from _DSD */ |
7f2e553a | 1856 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
0d9a693c MW |
1857 | if (con_id && strcmp(con_id, "gpios")) { |
1858 | snprintf(propname, sizeof(propname), "%s-%s", | |
7f2e553a | 1859 | con_id, gpio_suffixes[i]); |
0d9a693c MW |
1860 | } else { |
1861 | snprintf(propname, sizeof(propname), "%s", | |
7f2e553a | 1862 | gpio_suffixes[i]); |
0d9a693c MW |
1863 | } |
1864 | ||
1865 | desc = acpi_get_gpiod_by_index(adev, propname, idx, &info); | |
1866 | if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER)) | |
1867 | break; | |
1868 | } | |
1869 | ||
1870 | /* Then from plain _CRS GPIOs */ | |
1871 | if (IS_ERR(desc)) { | |
9c3c9bc9 DT |
1872 | if (!acpi_can_fallback_to_crs(adev, con_id)) |
1873 | return ERR_PTR(-ENOENT); | |
1874 | ||
0d9a693c MW |
1875 | desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info); |
1876 | if (IS_ERR(desc)) | |
1877 | return desc; | |
1878 | } | |
e01f440a | 1879 | |
0d9a693c | 1880 | if (info.active_low) |
53e7cac3 | 1881 | *flags |= GPIO_ACTIVE_LOW; |
e01f440a MW |
1882 | |
1883 | return desc; | |
81f59e9d MW |
1884 | } |
1885 | ||
ad824783 | 1886 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
bae48da2 AC |
1887 | { |
1888 | const char *dev_id = dev ? dev_name(dev) : NULL; | |
ad824783 | 1889 | struct gpiod_lookup_table *table; |
bae48da2 AC |
1890 | |
1891 | mutex_lock(&gpio_lookup_lock); | |
1892 | ||
ad824783 AC |
1893 | list_for_each_entry(table, &gpio_lookup_list, list) { |
1894 | if (table->dev_id && dev_id) { | |
1895 | /* | |
1896 | * Valid strings on both ends, must be identical to have | |
1897 | * a match | |
1898 | */ | |
1899 | if (!strcmp(table->dev_id, dev_id)) | |
1900 | goto found; | |
1901 | } else { | |
1902 | /* | |
1903 | * One of the pointers is NULL, so both must be to have | |
1904 | * a match | |
1905 | */ | |
1906 | if (dev_id == table->dev_id) | |
1907 | goto found; | |
1908 | } | |
1909 | } | |
1910 | table = NULL; | |
bae48da2 | 1911 | |
ad824783 AC |
1912 | found: |
1913 | mutex_unlock(&gpio_lookup_lock); | |
1914 | return table; | |
1915 | } | |
bae48da2 | 1916 | |
ad824783 AC |
1917 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
1918 | unsigned int idx, | |
1919 | enum gpio_lookup_flags *flags) | |
1920 | { | |
2a3cf6a3 | 1921 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
ad824783 AC |
1922 | struct gpiod_lookup_table *table; |
1923 | struct gpiod_lookup *p; | |
bae48da2 | 1924 | |
ad824783 AC |
1925 | table = gpiod_find_lookup_table(dev); |
1926 | if (!table) | |
1927 | return desc; | |
bae48da2 | 1928 | |
ad824783 AC |
1929 | for (p = &table->table[0]; p->chip_label; p++) { |
1930 | struct gpio_chip *chip; | |
bae48da2 | 1931 | |
ad824783 | 1932 | /* idx must always match exactly */ |
bae48da2 AC |
1933 | if (p->idx != idx) |
1934 | continue; | |
1935 | ||
ad824783 AC |
1936 | /* If the lookup entry has a con_id, require exact match */ |
1937 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) | |
1938 | continue; | |
bae48da2 | 1939 | |
ad824783 | 1940 | chip = find_chip_by_name(p->chip_label); |
bae48da2 | 1941 | |
ad824783 | 1942 | if (!chip) { |
2a3cf6a3 AC |
1943 | dev_err(dev, "cannot find GPIO chip %s\n", |
1944 | p->chip_label); | |
1945 | return ERR_PTR(-ENODEV); | |
ad824783 | 1946 | } |
bae48da2 | 1947 | |
ad824783 | 1948 | if (chip->ngpio <= p->chip_hwnum) { |
2a3cf6a3 AC |
1949 | dev_err(dev, |
1950 | "requested GPIO %d is out of range [0..%d] for chip %s\n", | |
1951 | idx, chip->ngpio, chip->label); | |
1952 | return ERR_PTR(-EINVAL); | |
bae48da2 | 1953 | } |
bae48da2 | 1954 | |
bb1e88cc | 1955 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
ad824783 | 1956 | *flags = p->flags; |
bae48da2 | 1957 | |
2a3cf6a3 | 1958 | return desc; |
bae48da2 AC |
1959 | } |
1960 | ||
bae48da2 AC |
1961 | return desc; |
1962 | } | |
1963 | ||
66858527 RI |
1964 | static int dt_gpio_count(struct device *dev, const char *con_id) |
1965 | { | |
1966 | int ret; | |
1967 | char propname[32]; | |
1968 | unsigned int i; | |
1969 | ||
1970 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { | |
1971 | if (con_id) | |
1972 | snprintf(propname, sizeof(propname), "%s-%s", | |
1973 | con_id, gpio_suffixes[i]); | |
1974 | else | |
1975 | snprintf(propname, sizeof(propname), "%s", | |
1976 | gpio_suffixes[i]); | |
1977 | ||
1978 | ret = of_gpio_named_count(dev->of_node, propname); | |
1979 | if (ret >= 0) | |
1980 | break; | |
1981 | } | |
1982 | return ret; | |
1983 | } | |
1984 | ||
1985 | static int platform_gpio_count(struct device *dev, const char *con_id) | |
1986 | { | |
1987 | struct gpiod_lookup_table *table; | |
1988 | struct gpiod_lookup *p; | |
1989 | unsigned int count = 0; | |
1990 | ||
1991 | table = gpiod_find_lookup_table(dev); | |
1992 | if (!table) | |
1993 | return -ENOENT; | |
1994 | ||
1995 | for (p = &table->table[0]; p->chip_label; p++) { | |
1996 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || | |
1997 | (!con_id && !p->con_id)) | |
1998 | count++; | |
1999 | } | |
2000 | if (!count) | |
2001 | return -ENOENT; | |
2002 | ||
2003 | return count; | |
2004 | } | |
2005 | ||
2006 | /** | |
2007 | * gpiod_count - return the number of GPIOs associated with a device / function | |
2008 | * or -ENOENT if no GPIO has been assigned to the requested function | |
2009 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2010 | * @con_id: function within the GPIO consumer | |
2011 | */ | |
2012 | int gpiod_count(struct device *dev, const char *con_id) | |
2013 | { | |
2014 | int count = -ENOENT; | |
2015 | ||
2016 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) | |
2017 | count = dt_gpio_count(dev, con_id); | |
2018 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) | |
2019 | count = acpi_gpio_count(dev, con_id); | |
2020 | ||
2021 | if (count < 0) | |
2022 | count = platform_gpio_count(dev, con_id); | |
2023 | ||
2024 | return count; | |
2025 | } | |
2026 | EXPORT_SYMBOL_GPL(gpiod_count); | |
2027 | ||
bae48da2 | 2028 | /** |
0879162f | 2029 | * gpiod_get - obtain a GPIO for a given GPIO function |
ad824783 | 2030 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 | 2031 | * @con_id: function within the GPIO consumer |
39b2bbe3 | 2032 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2033 | * |
2034 | * Return the GPIO descriptor corresponding to the function con_id of device | |
2a3cf6a3 | 2035 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
20a8a968 | 2036 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
bae48da2 | 2037 | */ |
b17d1bf1 | 2038 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
39b2bbe3 | 2039 | enum gpiod_flags flags) |
bae48da2 | 2040 | { |
39b2bbe3 | 2041 | return gpiod_get_index(dev, con_id, 0, flags); |
bae48da2 | 2042 | } |
b17d1bf1 | 2043 | EXPORT_SYMBOL_GPL(gpiod_get); |
bae48da2 | 2044 | |
29a1f233 TR |
2045 | /** |
2046 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function | |
2047 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2048 | * @con_id: function within the GPIO consumer | |
39b2bbe3 | 2049 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2050 | * |
2051 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to | |
2052 | * the requested function it will return NULL. This is convenient for drivers | |
2053 | * that need to handle optional GPIOs. | |
2054 | */ | |
b17d1bf1 | 2055 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
39b2bbe3 AC |
2056 | const char *con_id, |
2057 | enum gpiod_flags flags) | |
29a1f233 | 2058 | { |
39b2bbe3 | 2059 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
29a1f233 | 2060 | } |
b17d1bf1 | 2061 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
29a1f233 | 2062 | |
923b93e4 LP |
2063 | /** |
2064 | * gpiod_parse_flags - helper function to parse GPIO lookup flags | |
2065 | * @desc: gpio to be setup | |
2066 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2067 | * of_get_gpio_hog() | |
2068 | * | |
2069 | * Set the GPIO descriptor flags based on the given GPIO lookup flags. | |
2070 | */ | |
2071 | static void gpiod_parse_flags(struct gpio_desc *desc, unsigned long lflags) | |
2072 | { | |
2073 | if (lflags & GPIO_ACTIVE_LOW) | |
2074 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2075 | if (lflags & GPIO_OPEN_DRAIN) | |
2076 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2077 | if (lflags & GPIO_OPEN_SOURCE) | |
2078 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2079 | } | |
f625d460 BP |
2080 | |
2081 | /** | |
2082 | * gpiod_configure_flags - helper function to configure a given GPIO | |
2083 | * @desc: gpio whose value will be assigned | |
2084 | * @con_id: function within the GPIO consumer | |
f625d460 BP |
2085 | * @dflags: gpiod_flags - optional GPIO initialization flags |
2086 | * | |
2087 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the | |
2088 | * requested function and/or index, or another IS_ERR() code if an error | |
2089 | * occurred while trying to acquire the GPIO. | |
2090 | */ | |
2091 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, | |
923b93e4 | 2092 | enum gpiod_flags dflags) |
f625d460 BP |
2093 | { |
2094 | int status; | |
2095 | ||
f625d460 BP |
2096 | /* No particular flag request, return here... */ |
2097 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { | |
2098 | pr_debug("no flags found for %s\n", con_id); | |
2099 | return 0; | |
2100 | } | |
2101 | ||
2102 | /* Process flags */ | |
2103 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) | |
2104 | status = gpiod_direction_output(desc, | |
2105 | dflags & GPIOD_FLAGS_BIT_DIR_VAL); | |
2106 | else | |
2107 | status = gpiod_direction_input(desc); | |
2108 | ||
2109 | return status; | |
2110 | } | |
2111 | ||
bae48da2 AC |
2112 | /** |
2113 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function | |
fdd6a5fe | 2114 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
bae48da2 AC |
2115 | * @con_id: function within the GPIO consumer |
2116 | * @idx: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2117 | * @flags: optional GPIO initialization flags |
bae48da2 AC |
2118 | * |
2119 | * This variant of gpiod_get() allows to access GPIOs other than the first | |
2120 | * defined one for functions that define several GPIOs. | |
2121 | * | |
2a3cf6a3 AC |
2122 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
2123 | * requested function and/or index, or another IS_ERR() code if an error | |
20a8a968 | 2124 | * occurred while trying to acquire the GPIO. |
bae48da2 | 2125 | */ |
b17d1bf1 | 2126 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
bae48da2 | 2127 | const char *con_id, |
39b2bbe3 AC |
2128 | unsigned int idx, |
2129 | enum gpiod_flags flags) | |
bae48da2 | 2130 | { |
35c5d7fd | 2131 | struct gpio_desc *desc = NULL; |
bae48da2 | 2132 | int status; |
39b2bbe3 | 2133 | enum gpio_lookup_flags lookupflags = 0; |
bae48da2 AC |
2134 | |
2135 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); | |
2136 | ||
4d8440b9 RW |
2137 | if (dev) { |
2138 | /* Using device tree? */ | |
2139 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { | |
2140 | dev_dbg(dev, "using device tree for GPIO lookup\n"); | |
2141 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); | |
2142 | } else if (ACPI_COMPANION(dev)) { | |
2143 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); | |
2144 | desc = acpi_find_gpio(dev, con_id, idx, &lookupflags); | |
2145 | } | |
35c5d7fd AC |
2146 | } |
2147 | ||
2148 | /* | |
2149 | * Either we are not using DT or ACPI, or their lookup did not return | |
2150 | * a result. In that case, use platform lookup as a fallback. | |
2151 | */ | |
2a3cf6a3 | 2152 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
43a8785a | 2153 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
39b2bbe3 | 2154 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
bae48da2 AC |
2155 | } |
2156 | ||
2157 | if (IS_ERR(desc)) { | |
351cfe0f | 2158 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
bae48da2 AC |
2159 | return desc; |
2160 | } | |
2161 | ||
923b93e4 LP |
2162 | gpiod_parse_flags(desc, lookupflags); |
2163 | ||
bae48da2 | 2164 | status = gpiod_request(desc, con_id); |
bae48da2 AC |
2165 | if (status < 0) |
2166 | return ERR_PTR(status); | |
2167 | ||
923b93e4 | 2168 | status = gpiod_configure_flags(desc, con_id, flags); |
39b2bbe3 AC |
2169 | if (status < 0) { |
2170 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); | |
2171 | gpiod_put(desc); | |
2172 | return ERR_PTR(status); | |
2173 | } | |
2174 | ||
bae48da2 AC |
2175 | return desc; |
2176 | } | |
b17d1bf1 | 2177 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
bae48da2 | 2178 | |
40b73183 MW |
2179 | /** |
2180 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node | |
2181 | * @fwnode: handle of the firmware node | |
2182 | * @propname: name of the firmware property representing the GPIO | |
2183 | * | |
2184 | * This function can be used for drivers that get their configuration | |
2185 | * from firmware. | |
2186 | * | |
2187 | * Function properly finds the corresponding GPIO using whatever is the | |
2188 | * underlying firmware interface and then makes sure that the GPIO | |
2189 | * descriptor is requested before it is returned to the caller. | |
2190 | * | |
2191 | * In case of error an ERR_PTR() is returned. | |
2192 | */ | |
2193 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, | |
2194 | const char *propname) | |
2195 | { | |
2196 | struct gpio_desc *desc = ERR_PTR(-ENODEV); | |
2197 | bool active_low = false; | |
90b665f6 | 2198 | bool single_ended = false; |
40b73183 MW |
2199 | int ret; |
2200 | ||
2201 | if (!fwnode) | |
2202 | return ERR_PTR(-EINVAL); | |
2203 | ||
2204 | if (is_of_node(fwnode)) { | |
2205 | enum of_gpio_flags flags; | |
2206 | ||
c181fb3e | 2207 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, 0, |
40b73183 | 2208 | &flags); |
90b665f6 | 2209 | if (!IS_ERR(desc)) { |
40b73183 | 2210 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
90b665f6 LP |
2211 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
2212 | } | |
40b73183 MW |
2213 | } else if (is_acpi_node(fwnode)) { |
2214 | struct acpi_gpio_info info; | |
2215 | ||
504a3374 | 2216 | desc = acpi_node_get_gpiod(fwnode, propname, 0, &info); |
40b73183 MW |
2217 | if (!IS_ERR(desc)) |
2218 | active_low = info.active_low; | |
2219 | } | |
2220 | ||
2221 | if (IS_ERR(desc)) | |
2222 | return desc; | |
2223 | ||
40b73183 MW |
2224 | if (active_low) |
2225 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); | |
2226 | ||
90b665f6 LP |
2227 | if (single_ended) { |
2228 | if (active_low) | |
2229 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); | |
2230 | else | |
2231 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); | |
2232 | } | |
2233 | ||
923b93e4 LP |
2234 | ret = gpiod_request(desc, NULL); |
2235 | if (ret) | |
2236 | return ERR_PTR(ret); | |
2237 | ||
40b73183 MW |
2238 | return desc; |
2239 | } | |
2240 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); | |
2241 | ||
29a1f233 TR |
2242 | /** |
2243 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO | |
2244 | * function | |
2245 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2246 | * @con_id: function within the GPIO consumer | |
2247 | * @index: index of the GPIO to obtain in the consumer | |
39b2bbe3 | 2248 | * @flags: optional GPIO initialization flags |
29a1f233 TR |
2249 | * |
2250 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the | |
2251 | * specified index was assigned to the requested function it will return NULL. | |
2252 | * This is convenient for drivers that need to handle optional GPIOs. | |
2253 | */ | |
b17d1bf1 | 2254 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
29a1f233 | 2255 | const char *con_id, |
39b2bbe3 AC |
2256 | unsigned int index, |
2257 | enum gpiod_flags flags) | |
29a1f233 TR |
2258 | { |
2259 | struct gpio_desc *desc; | |
2260 | ||
39b2bbe3 | 2261 | desc = gpiod_get_index(dev, con_id, index, flags); |
29a1f233 TR |
2262 | if (IS_ERR(desc)) { |
2263 | if (PTR_ERR(desc) == -ENOENT) | |
2264 | return NULL; | |
2265 | } | |
2266 | ||
2267 | return desc; | |
2268 | } | |
b17d1bf1 | 2269 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
29a1f233 | 2270 | |
f625d460 BP |
2271 | /** |
2272 | * gpiod_hog - Hog the specified GPIO desc given the provided flags | |
2273 | * @desc: gpio whose value will be assigned | |
2274 | * @name: gpio line name | |
2275 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or | |
2276 | * of_get_gpio_hog() | |
2277 | * @dflags: gpiod_flags - optional GPIO initialization flags | |
2278 | */ | |
2279 | int gpiod_hog(struct gpio_desc *desc, const char *name, | |
2280 | unsigned long lflags, enum gpiod_flags dflags) | |
2281 | { | |
2282 | struct gpio_chip *chip; | |
2283 | struct gpio_desc *local_desc; | |
2284 | int hwnum; | |
2285 | int status; | |
2286 | ||
2287 | chip = gpiod_to_chip(desc); | |
2288 | hwnum = gpio_chip_hwgpio(desc); | |
2289 | ||
923b93e4 LP |
2290 | gpiod_parse_flags(desc, lflags); |
2291 | ||
f625d460 BP |
2292 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); |
2293 | if (IS_ERR(local_desc)) { | |
a713890d LW |
2294 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed\n", |
2295 | name, chip->label, hwnum); | |
f625d460 BP |
2296 | return PTR_ERR(local_desc); |
2297 | } | |
2298 | ||
923b93e4 | 2299 | status = gpiod_configure_flags(desc, name, dflags); |
f625d460 | 2300 | if (status < 0) { |
a713890d LW |
2301 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed\n", |
2302 | name, chip->label, hwnum); | |
f625d460 BP |
2303 | gpiochip_free_own_desc(desc); |
2304 | return status; | |
2305 | } | |
2306 | ||
2307 | /* Mark GPIO as hogged so it can be identified and removed later */ | |
2308 | set_bit(FLAG_IS_HOGGED, &desc->flags); | |
2309 | ||
2310 | pr_info("GPIO line %d (%s) hogged as %s%s\n", | |
2311 | desc_to_gpio(desc), name, | |
2312 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", | |
2313 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? | |
2314 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); | |
2315 | ||
2316 | return 0; | |
2317 | } | |
2318 | ||
2319 | /** | |
2320 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog | |
2321 | * @chip: gpio chip to act on | |
2322 | * | |
2323 | * This is only used by of_gpiochip_remove to free hogged gpios | |
2324 | */ | |
2325 | static void gpiochip_free_hogs(struct gpio_chip *chip) | |
2326 | { | |
2327 | int id; | |
2328 | ||
2329 | for (id = 0; id < chip->ngpio; id++) { | |
2330 | if (test_bit(FLAG_IS_HOGGED, &chip->desc[id].flags)) | |
2331 | gpiochip_free_own_desc(&chip->desc[id]); | |
2332 | } | |
2333 | } | |
2334 | ||
66858527 RI |
2335 | /** |
2336 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function | |
2337 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2338 | * @con_id: function within the GPIO consumer | |
2339 | * @flags: optional GPIO initialization flags | |
2340 | * | |
2341 | * This function acquires all the GPIOs defined under a given function. | |
2342 | * | |
2343 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if | |
2344 | * no GPIO has been assigned to the requested function, or another IS_ERR() | |
2345 | * code if an error occurred while trying to acquire the GPIOs. | |
2346 | */ | |
2347 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, | |
2348 | const char *con_id, | |
2349 | enum gpiod_flags flags) | |
2350 | { | |
2351 | struct gpio_desc *desc; | |
2352 | struct gpio_descs *descs; | |
2353 | int count; | |
2354 | ||
2355 | count = gpiod_count(dev, con_id); | |
2356 | if (count < 0) | |
2357 | return ERR_PTR(count); | |
2358 | ||
2359 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, | |
2360 | GFP_KERNEL); | |
2361 | if (!descs) | |
2362 | return ERR_PTR(-ENOMEM); | |
2363 | ||
2364 | for (descs->ndescs = 0; descs->ndescs < count; ) { | |
2365 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); | |
2366 | if (IS_ERR(desc)) { | |
2367 | gpiod_put_array(descs); | |
2368 | return ERR_CAST(desc); | |
2369 | } | |
2370 | descs->desc[descs->ndescs] = desc; | |
2371 | descs->ndescs++; | |
2372 | } | |
2373 | return descs; | |
2374 | } | |
2375 | EXPORT_SYMBOL_GPL(gpiod_get_array); | |
2376 | ||
2377 | /** | |
2378 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO | |
2379 | * function | |
2380 | * @dev: GPIO consumer, can be NULL for system-global GPIOs | |
2381 | * @con_id: function within the GPIO consumer | |
2382 | * @flags: optional GPIO initialization flags | |
2383 | * | |
2384 | * This is equivalent to gpiod_get_array(), except that when no GPIO was | |
2385 | * assigned to the requested function it will return NULL. | |
2386 | */ | |
2387 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, | |
2388 | const char *con_id, | |
2389 | enum gpiod_flags flags) | |
2390 | { | |
2391 | struct gpio_descs *descs; | |
2392 | ||
2393 | descs = gpiod_get_array(dev, con_id, flags); | |
2394 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) | |
2395 | return NULL; | |
2396 | ||
2397 | return descs; | |
2398 | } | |
2399 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); | |
2400 | ||
bae48da2 AC |
2401 | /** |
2402 | * gpiod_put - dispose of a GPIO descriptor | |
2403 | * @desc: GPIO descriptor to dispose of | |
2404 | * | |
2405 | * No descriptor can be used after gpiod_put() has been called on it. | |
2406 | */ | |
2407 | void gpiod_put(struct gpio_desc *desc) | |
2408 | { | |
2409 | gpiod_free(desc); | |
372e722e | 2410 | } |
bae48da2 | 2411 | EXPORT_SYMBOL_GPL(gpiod_put); |
d2876d08 | 2412 | |
66858527 RI |
2413 | /** |
2414 | * gpiod_put_array - dispose of multiple GPIO descriptors | |
2415 | * @descs: struct gpio_descs containing an array of descriptors | |
2416 | */ | |
2417 | void gpiod_put_array(struct gpio_descs *descs) | |
2418 | { | |
2419 | unsigned int i; | |
2420 | ||
2421 | for (i = 0; i < descs->ndescs; i++) | |
2422 | gpiod_put(descs->desc[i]); | |
2423 | ||
2424 | kfree(descs); | |
2425 | } | |
2426 | EXPORT_SYMBOL_GPL(gpiod_put_array); | |
2427 | ||
d2876d08 DB |
2428 | #ifdef CONFIG_DEBUG_FS |
2429 | ||
d2876d08 DB |
2430 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
2431 | { | |
2432 | unsigned i; | |
2433 | unsigned gpio = chip->base; | |
6c0b4e6c | 2434 | struct gpio_desc *gdesc = &chip->desc[0]; |
d2876d08 | 2435 | int is_out; |
d468bf9e | 2436 | int is_irq; |
d2876d08 DB |
2437 | |
2438 | for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) { | |
ced433e2 MP |
2439 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
2440 | if (gdesc->name) { | |
2441 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", | |
2442 | gpio, gdesc->name); | |
2443 | } | |
d2876d08 | 2444 | continue; |
ced433e2 | 2445 | } |
d2876d08 | 2446 | |
372e722e | 2447 | gpiod_get_direction(gdesc); |
d2876d08 | 2448 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
d468bf9e | 2449 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
ced433e2 MP |
2450 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
2451 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, | |
d2876d08 DB |
2452 | is_out ? "out" : "in ", |
2453 | chip->get | |
2454 | ? (chip->get(chip, i) ? "hi" : "lo") | |
d468bf9e LW |
2455 | : "? ", |
2456 | is_irq ? "IRQ" : " "); | |
d2876d08 DB |
2457 | seq_printf(s, "\n"); |
2458 | } | |
2459 | } | |
2460 | ||
f9c4a31f | 2461 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
d2876d08 | 2462 | { |
362432ae | 2463 | unsigned long flags; |
f9c4a31f | 2464 | struct gpio_chip *chip = NULL; |
cb1650d4 | 2465 | loff_t index = *pos; |
d2876d08 | 2466 | |
f9c4a31f | 2467 | s->private = ""; |
d2876d08 | 2468 | |
362432ae | 2469 | spin_lock_irqsave(&gpio_lock, flags); |
cb1650d4 | 2470 | list_for_each_entry(chip, &gpio_chips, list) |
362432ae GL |
2471 | if (index-- == 0) { |
2472 | spin_unlock_irqrestore(&gpio_lock, flags); | |
cb1650d4 | 2473 | return chip; |
f9c4a31f | 2474 | } |
362432ae | 2475 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f | 2476 | |
cb1650d4 | 2477 | return NULL; |
f9c4a31f TR |
2478 | } |
2479 | ||
2480 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) | |
2481 | { | |
362432ae | 2482 | unsigned long flags; |
f9c4a31f | 2483 | struct gpio_chip *chip = v; |
f9c4a31f TR |
2484 | void *ret = NULL; |
2485 | ||
362432ae | 2486 | spin_lock_irqsave(&gpio_lock, flags); |
cb1650d4 AC |
2487 | if (list_is_last(&chip->list, &gpio_chips)) |
2488 | ret = NULL; | |
2489 | else | |
2490 | ret = list_entry(chip->list.next, struct gpio_chip, list); | |
362432ae | 2491 | spin_unlock_irqrestore(&gpio_lock, flags); |
f9c4a31f TR |
2492 | |
2493 | s->private = "\n"; | |
2494 | ++*pos; | |
2495 | ||
2496 | return ret; | |
2497 | } | |
2498 | ||
2499 | static void gpiolib_seq_stop(struct seq_file *s, void *v) | |
2500 | { | |
2501 | } | |
2502 | ||
2503 | static int gpiolib_seq_show(struct seq_file *s, void *v) | |
2504 | { | |
2505 | struct gpio_chip *chip = v; | |
2506 | struct device *dev; | |
2507 | ||
2508 | seq_printf(s, "%sGPIOs %d-%d", (char *)s->private, | |
2509 | chip->base, chip->base + chip->ngpio - 1); | |
58383c78 | 2510 | dev = chip->parent; |
f9c4a31f TR |
2511 | if (dev) |
2512 | seq_printf(s, ", %s/%s", dev->bus ? dev->bus->name : "no-bus", | |
2513 | dev_name(dev)); | |
2514 | if (chip->label) | |
2515 | seq_printf(s, ", %s", chip->label); | |
2516 | if (chip->can_sleep) | |
2517 | seq_printf(s, ", can sleep"); | |
2518 | seq_printf(s, ":\n"); | |
2519 | ||
2520 | if (chip->dbg_show) | |
2521 | chip->dbg_show(s, chip); | |
2522 | else | |
2523 | gpiolib_dbg_show(s, chip); | |
2524 | ||
d2876d08 DB |
2525 | return 0; |
2526 | } | |
2527 | ||
f9c4a31f TR |
2528 | static const struct seq_operations gpiolib_seq_ops = { |
2529 | .start = gpiolib_seq_start, | |
2530 | .next = gpiolib_seq_next, | |
2531 | .stop = gpiolib_seq_stop, | |
2532 | .show = gpiolib_seq_show, | |
2533 | }; | |
2534 | ||
d2876d08 DB |
2535 | static int gpiolib_open(struct inode *inode, struct file *file) |
2536 | { | |
f9c4a31f | 2537 | return seq_open(file, &gpiolib_seq_ops); |
d2876d08 DB |
2538 | } |
2539 | ||
828c0950 | 2540 | static const struct file_operations gpiolib_operations = { |
f9c4a31f | 2541 | .owner = THIS_MODULE, |
d2876d08 DB |
2542 | .open = gpiolib_open, |
2543 | .read = seq_read, | |
2544 | .llseek = seq_lseek, | |
f9c4a31f | 2545 | .release = seq_release, |
d2876d08 DB |
2546 | }; |
2547 | ||
2548 | static int __init gpiolib_debugfs_init(void) | |
2549 | { | |
2550 | /* /sys/kernel/debug/gpio */ | |
2551 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, | |
2552 | NULL, NULL, &gpiolib_operations); | |
2553 | return 0; | |
2554 | } | |
2555 | subsys_initcall(gpiolib_debugfs_init); | |
2556 | ||
2557 | #endif /* DEBUG_FS */ |