Commit | Line | Data |
---|---|---|
e29482e8 MN |
1 | /* |
2 | * ACPI helpers for GPIO API | |
3 | * | |
4 | * Copyright (C) 2012, Intel Corporation | |
5 | * Authors: Mathias Nyman <mathias.nyman@linux.intel.com> | |
6 | * Mika Westerberg <mika.westerberg@linux.intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/errno.h> | |
936e15dd | 14 | #include <linux/gpio/consumer.h> |
5ccff852 | 15 | #include <linux/gpio/driver.h> |
e29482e8 | 16 | #include <linux/export.h> |
e29482e8 | 17 | #include <linux/acpi.h> |
0d1c28a4 | 18 | #include <linux/interrupt.h> |
473ed7be | 19 | #include <linux/mutex.h> |
e29482e8 | 20 | |
5ccff852 MW |
21 | #include "gpiolib.h" |
22 | ||
4b01a14b | 23 | struct acpi_gpio_event { |
7fc7acb9 | 24 | struct list_head node; |
4b01a14b | 25 | acpi_handle handle; |
7fc7acb9 RW |
26 | unsigned int pin; |
27 | unsigned int irq; | |
28 | }; | |
29 | ||
473ed7be MW |
30 | struct acpi_gpio_connection { |
31 | struct list_head node; | |
32 | struct gpio_desc *desc; | |
33 | }; | |
34 | ||
aa92b6f6 | 35 | struct acpi_gpio_chip { |
473ed7be MW |
36 | /* |
37 | * ACPICA requires that the first field of the context parameter | |
38 | * passed to acpi_install_address_space_handler() is large enough | |
39 | * to hold struct acpi_connection_info. | |
40 | */ | |
41 | struct acpi_connection_info conn_info; | |
42 | struct list_head conns; | |
43 | struct mutex conn_lock; | |
aa92b6f6 | 44 | struct gpio_chip *chip; |
4b01a14b | 45 | struct list_head events; |
aa92b6f6 MW |
46 | }; |
47 | ||
e29482e8 MN |
48 | static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) |
49 | { | |
50 | if (!gc->dev) | |
51 | return false; | |
52 | ||
53 | return ACPI_HANDLE(gc->dev) == data; | |
54 | } | |
55 | ||
56 | /** | |
936e15dd | 57 | * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API |
e29482e8 MN |
58 | * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") |
59 | * @pin: ACPI GPIO pin number (0-based, controller-relative) | |
60 | * | |
936e15dd MW |
61 | * Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR |
62 | * error value | |
e29482e8 MN |
63 | */ |
64 | ||
936e15dd | 65 | static struct gpio_desc *acpi_get_gpiod(char *path, int pin) |
e29482e8 MN |
66 | { |
67 | struct gpio_chip *chip; | |
68 | acpi_handle handle; | |
69 | acpi_status status; | |
70 | ||
71 | status = acpi_get_handle(NULL, path, &handle); | |
72 | if (ACPI_FAILURE(status)) | |
936e15dd | 73 | return ERR_PTR(-ENODEV); |
e29482e8 MN |
74 | |
75 | chip = gpiochip_find(handle, acpi_gpiochip_find); | |
76 | if (!chip) | |
936e15dd | 77 | return ERR_PTR(-ENODEV); |
e29482e8 | 78 | |
936e15dd MW |
79 | if (pin < 0 || pin > chip->ngpio) |
80 | return ERR_PTR(-EINVAL); | |
e29482e8 | 81 | |
390d82e3 | 82 | return gpiochip_get_desc(chip, pin); |
e29482e8 | 83 | } |
0d1c28a4 | 84 | |
0d1c28a4 MN |
85 | static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) |
86 | { | |
6072b9dc | 87 | struct acpi_gpio_event *event = data; |
0d1c28a4 | 88 | |
6072b9dc | 89 | acpi_evaluate_object(event->handle, NULL, NULL, NULL); |
0d1c28a4 MN |
90 | |
91 | return IRQ_HANDLED; | |
92 | } | |
93 | ||
7fc7acb9 RW |
94 | static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data) |
95 | { | |
4b01a14b | 96 | struct acpi_gpio_event *event = data; |
7fc7acb9 | 97 | |
4b01a14b | 98 | acpi_execute_simple_method(event->handle, NULL, event->pin); |
7fc7acb9 RW |
99 | |
100 | return IRQ_HANDLED; | |
101 | } | |
102 | ||
aa92b6f6 | 103 | static void acpi_gpio_chip_dh(acpi_handle handle, void *data) |
7fc7acb9 RW |
104 | { |
105 | /* The address of this function is used as a key. */ | |
106 | } | |
107 | ||
6072b9dc MW |
108 | static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares, |
109 | void *context) | |
0d1c28a4 | 110 | { |
6072b9dc | 111 | struct acpi_gpio_chip *acpi_gpio = context; |
aa92b6f6 | 112 | struct gpio_chip *chip = acpi_gpio->chip; |
6072b9dc | 113 | struct acpi_resource_gpio *agpio; |
7fc7acb9 | 114 | acpi_handle handle, evt_handle; |
6072b9dc MW |
115 | struct acpi_gpio_event *event; |
116 | irq_handler_t handler = NULL; | |
117 | struct gpio_desc *desc; | |
118 | unsigned long irqflags; | |
119 | int ret, pin, irq; | |
0d1c28a4 | 120 | |
6072b9dc MW |
121 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) |
122 | return AE_OK; | |
123 | ||
124 | agpio = &ares->data.gpio; | |
125 | if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT) | |
126 | return AE_OK; | |
0d1c28a4 MN |
127 | |
128 | handle = ACPI_HANDLE(chip->dev); | |
6072b9dc MW |
129 | pin = agpio->pin_table[0]; |
130 | ||
131 | if (pin <= 255) { | |
132 | char ev_name[5]; | |
133 | sprintf(ev_name, "_%c%02X", | |
134 | agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L', | |
135 | pin); | |
136 | if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle))) | |
137 | handler = acpi_gpio_irq_handler; | |
138 | } | |
139 | if (!handler) { | |
140 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle))) | |
141 | handler = acpi_gpio_irq_handler_evt; | |
142 | } | |
143 | if (!handler) | |
144 | return AE_BAD_PARAMETER; | |
0d1c28a4 | 145 | |
6072b9dc MW |
146 | desc = gpiochip_get_desc(chip, pin); |
147 | if (IS_ERR(desc)) { | |
148 | dev_err(chip->dev, "Failed to get GPIO descriptor\n"); | |
149 | return AE_ERROR; | |
150 | } | |
0d1c28a4 | 151 | |
6072b9dc MW |
152 | ret = gpiochip_request_own_desc(desc, "ACPI:Event"); |
153 | if (ret) { | |
154 | dev_err(chip->dev, "Failed to request GPIO\n"); | |
155 | return AE_ERROR; | |
156 | } | |
0d1c28a4 | 157 | |
6072b9dc | 158 | gpiod_direction_input(desc); |
0d1c28a4 | 159 | |
d74be6df | 160 | ret = gpio_lock_as_irq(chip, pin); |
6072b9dc MW |
161 | if (ret) { |
162 | dev_err(chip->dev, "Failed to lock GPIO as interrupt\n"); | |
163 | goto fail_free_desc; | |
164 | } | |
0d1c28a4 | 165 | |
6072b9dc MW |
166 | irq = gpiod_to_irq(desc); |
167 | if (irq < 0) { | |
168 | dev_err(chip->dev, "Failed to translate GPIO to IRQ\n"); | |
169 | goto fail_unlock_irq; | |
170 | } | |
7fc7acb9 | 171 | |
6072b9dc MW |
172 | irqflags = IRQF_ONESHOT; |
173 | if (agpio->triggering == ACPI_LEVEL_SENSITIVE) { | |
174 | if (agpio->polarity == ACPI_ACTIVE_HIGH) | |
175 | irqflags |= IRQF_TRIGGER_HIGH; | |
176 | else | |
177 | irqflags |= IRQF_TRIGGER_LOW; | |
178 | } else { | |
179 | switch (agpio->polarity) { | |
180 | case ACPI_ACTIVE_HIGH: | |
181 | irqflags |= IRQF_TRIGGER_RISING; | |
182 | break; | |
183 | case ACPI_ACTIVE_LOW: | |
184 | irqflags |= IRQF_TRIGGER_FALLING; | |
185 | break; | |
186 | default: | |
187 | irqflags |= IRQF_TRIGGER_RISING | | |
188 | IRQF_TRIGGER_FALLING; | |
189 | break; | |
7fc7acb9 | 190 | } |
6072b9dc | 191 | } |
aa92b6f6 | 192 | |
6072b9dc MW |
193 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
194 | if (!event) | |
195 | goto fail_unlock_irq; | |
7fc7acb9 | 196 | |
6072b9dc MW |
197 | event->handle = evt_handle; |
198 | event->irq = irq; | |
199 | event->pin = pin; | |
7fc7acb9 | 200 | |
6072b9dc MW |
201 | ret = request_threaded_irq(event->irq, NULL, handler, irqflags, |
202 | "ACPI:Event", event); | |
203 | if (ret) { | |
204 | dev_err(chip->dev, "Failed to setup interrupt handler for %d\n", | |
205 | event->irq); | |
206 | goto fail_free_event; | |
0d1c28a4 | 207 | } |
6072b9dc MW |
208 | |
209 | list_add_tail(&event->node, &acpi_gpio->events); | |
210 | return AE_OK; | |
211 | ||
212 | fail_free_event: | |
213 | kfree(event); | |
214 | fail_unlock_irq: | |
d74be6df | 215 | gpio_unlock_as_irq(chip, pin); |
6072b9dc MW |
216 | fail_free_desc: |
217 | gpiochip_free_own_desc(desc); | |
218 | ||
219 | return AE_ERROR; | |
0d1c28a4 | 220 | } |
7fc7acb9 | 221 | |
70b53411 | 222 | /** |
6072b9dc | 223 | * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events |
afa82fab | 224 | * @chip: GPIO chip |
70b53411 | 225 | * |
6072b9dc MW |
226 | * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are |
227 | * handled by ACPI event methods which need to be called from the GPIO | |
228 | * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which | |
229 | * gpio pins have acpi event methods and assigns interrupt handlers that calls | |
230 | * the acpi event methods for those pins. | |
231 | */ | |
afa82fab | 232 | void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) |
6072b9dc | 233 | { |
afa82fab MW |
234 | struct acpi_gpio_chip *acpi_gpio; |
235 | acpi_handle handle; | |
236 | acpi_status status; | |
237 | ||
238 | if (!chip->dev || !chip->to_irq) | |
239 | return; | |
6072b9dc | 240 | |
afa82fab MW |
241 | handle = ACPI_HANDLE(chip->dev); |
242 | if (!handle) | |
243 | return; | |
244 | ||
245 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
246 | if (ACPI_FAILURE(status)) | |
6072b9dc MW |
247 | return; |
248 | ||
249 | INIT_LIST_HEAD(&acpi_gpio->events); | |
250 | acpi_walk_resources(ACPI_HANDLE(chip->dev), "_AEI", | |
251 | acpi_gpiochip_request_interrupt, acpi_gpio); | |
252 | } | |
253 | ||
254 | /** | |
255 | * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts. | |
afa82fab | 256 | * @chip: GPIO chip |
70b53411 | 257 | * |
6072b9dc MW |
258 | * Free interrupts associated with GPIO ACPI event method for the given |
259 | * GPIO chip. | |
70b53411 | 260 | */ |
afa82fab | 261 | void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) |
70b53411 | 262 | { |
afa82fab | 263 | struct acpi_gpio_chip *acpi_gpio; |
4b01a14b | 264 | struct acpi_gpio_event *event, *ep; |
afa82fab MW |
265 | acpi_handle handle; |
266 | acpi_status status; | |
267 | ||
268 | if (!chip->dev || !chip->to_irq) | |
269 | return; | |
70b53411 | 270 | |
afa82fab MW |
271 | handle = ACPI_HANDLE(chip->dev); |
272 | if (!handle) | |
273 | return; | |
274 | ||
275 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
276 | if (ACPI_FAILURE(status)) | |
70b53411 MW |
277 | return; |
278 | ||
4b01a14b | 279 | list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) { |
6072b9dc MW |
280 | struct gpio_desc *desc; |
281 | ||
282 | free_irq(event->irq, event); | |
283 | desc = gpiochip_get_desc(chip, event->pin); | |
284 | if (WARN_ON(IS_ERR(desc))) | |
285 | continue; | |
d74be6df | 286 | gpio_unlock_as_irq(chip, event->pin); |
6072b9dc | 287 | gpiochip_free_own_desc(desc); |
4b01a14b MW |
288 | list_del(&event->node); |
289 | kfree(event); | |
70b53411 | 290 | } |
70b53411 | 291 | } |
70b53411 | 292 | |
12028d2d MW |
293 | struct acpi_gpio_lookup { |
294 | struct acpi_gpio_info info; | |
295 | int index; | |
936e15dd | 296 | struct gpio_desc *desc; |
12028d2d MW |
297 | int n; |
298 | }; | |
299 | ||
300 | static int acpi_find_gpio(struct acpi_resource *ares, void *data) | |
301 | { | |
302 | struct acpi_gpio_lookup *lookup = data; | |
303 | ||
304 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
305 | return 1; | |
306 | ||
936e15dd | 307 | if (lookup->n++ == lookup->index && !lookup->desc) { |
12028d2d MW |
308 | const struct acpi_resource_gpio *agpio = &ares->data.gpio; |
309 | ||
936e15dd MW |
310 | lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, |
311 | agpio->pin_table[0]); | |
12028d2d MW |
312 | lookup->info.gpioint = |
313 | agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT; | |
e01f440a MW |
314 | lookup->info.active_low = |
315 | agpio->polarity == ACPI_ACTIVE_LOW; | |
12028d2d MW |
316 | } |
317 | ||
318 | return 1; | |
319 | } | |
320 | ||
321 | /** | |
936e15dd | 322 | * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources |
12028d2d MW |
323 | * @dev: pointer to a device to get GPIO from |
324 | * @index: index of GpioIo/GpioInt resource (starting from %0) | |
325 | * @info: info pointer to fill in (optional) | |
326 | * | |
327 | * Function goes through ACPI resources for @dev and based on @index looks | |
936e15dd | 328 | * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor, |
12028d2d MW |
329 | * and returns it. @index matches GpioIo/GpioInt resources only so if there |
330 | * are total %3 GPIO resources, the index goes from %0 to %2. | |
331 | * | |
936e15dd | 332 | * If the GPIO cannot be translated or there is an error an ERR_PTR is |
12028d2d MW |
333 | * returned. |
334 | * | |
335 | * Note: if the GPIO resource has multiple entries in the pin list, this | |
336 | * function only returns the first. | |
337 | */ | |
936e15dd MW |
338 | struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index, |
339 | struct acpi_gpio_info *info) | |
12028d2d MW |
340 | { |
341 | struct acpi_gpio_lookup lookup; | |
342 | struct list_head resource_list; | |
343 | struct acpi_device *adev; | |
344 | acpi_handle handle; | |
345 | int ret; | |
346 | ||
347 | if (!dev) | |
936e15dd | 348 | return ERR_PTR(-EINVAL); |
12028d2d MW |
349 | |
350 | handle = ACPI_HANDLE(dev); | |
351 | if (!handle || acpi_bus_get_device(handle, &adev)) | |
936e15dd | 352 | return ERR_PTR(-ENODEV); |
12028d2d MW |
353 | |
354 | memset(&lookup, 0, sizeof(lookup)); | |
355 | lookup.index = index; | |
12028d2d MW |
356 | |
357 | INIT_LIST_HEAD(&resource_list); | |
358 | ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio, | |
359 | &lookup); | |
360 | if (ret < 0) | |
936e15dd | 361 | return ERR_PTR(ret); |
12028d2d MW |
362 | |
363 | acpi_dev_free_resource_list(&resource_list); | |
364 | ||
936e15dd | 365 | if (lookup.desc && info) |
12028d2d MW |
366 | *info = lookup.info; |
367 | ||
a00580c2 | 368 | return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT); |
12028d2d | 369 | } |
664e3e5a | 370 | |
473ed7be MW |
371 | static acpi_status |
372 | acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, | |
373 | u32 bits, u64 *value, void *handler_context, | |
374 | void *region_context) | |
375 | { | |
376 | struct acpi_gpio_chip *achip = region_context; | |
377 | struct gpio_chip *chip = achip->chip; | |
378 | struct acpi_resource_gpio *agpio; | |
379 | struct acpi_resource *ares; | |
380 | acpi_status status; | |
381 | bool pull_up; | |
382 | int i; | |
383 | ||
384 | status = acpi_buffer_to_resource(achip->conn_info.connection, | |
385 | achip->conn_info.length, &ares); | |
386 | if (ACPI_FAILURE(status)) | |
387 | return status; | |
388 | ||
389 | if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) { | |
390 | ACPI_FREE(ares); | |
391 | return AE_BAD_PARAMETER; | |
392 | } | |
393 | ||
394 | agpio = &ares->data.gpio; | |
395 | pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP; | |
396 | ||
397 | if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT && | |
398 | function == ACPI_WRITE)) { | |
399 | ACPI_FREE(ares); | |
400 | return AE_BAD_PARAMETER; | |
401 | } | |
402 | ||
403 | for (i = 0; i < agpio->pin_table_length; i++) { | |
404 | unsigned pin = agpio->pin_table[i]; | |
405 | struct acpi_gpio_connection *conn; | |
406 | struct gpio_desc *desc; | |
407 | bool found; | |
408 | ||
409 | desc = gpiochip_get_desc(chip, pin); | |
410 | if (IS_ERR(desc)) { | |
411 | status = AE_ERROR; | |
412 | goto out; | |
413 | } | |
414 | ||
415 | mutex_lock(&achip->conn_lock); | |
416 | ||
417 | found = false; | |
418 | list_for_each_entry(conn, &achip->conns, node) { | |
419 | if (conn->desc == desc) { | |
420 | found = true; | |
421 | break; | |
422 | } | |
423 | } | |
424 | if (!found) { | |
425 | int ret; | |
426 | ||
427 | ret = gpiochip_request_own_desc(desc, "ACPI:OpRegion"); | |
428 | if (ret) { | |
429 | status = AE_ERROR; | |
430 | mutex_unlock(&achip->conn_lock); | |
431 | goto out; | |
432 | } | |
433 | ||
434 | switch (agpio->io_restriction) { | |
435 | case ACPI_IO_RESTRICT_INPUT: | |
436 | gpiod_direction_input(desc); | |
437 | break; | |
438 | case ACPI_IO_RESTRICT_OUTPUT: | |
439 | /* | |
440 | * ACPI GPIO resources don't contain an | |
441 | * initial value for the GPIO. Therefore we | |
442 | * deduce that value from the pull field | |
443 | * instead. If the pin is pulled up we | |
444 | * assume default to be high, otherwise | |
445 | * low. | |
446 | */ | |
447 | gpiod_direction_output(desc, pull_up); | |
448 | break; | |
449 | default: | |
450 | /* | |
451 | * Assume that the BIOS has configured the | |
452 | * direction and pull accordingly. | |
453 | */ | |
454 | break; | |
455 | } | |
456 | ||
457 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); | |
458 | if (!conn) { | |
459 | status = AE_NO_MEMORY; | |
460 | gpiochip_free_own_desc(desc); | |
461 | mutex_unlock(&achip->conn_lock); | |
462 | goto out; | |
463 | } | |
464 | ||
465 | conn->desc = desc; | |
466 | list_add_tail(&conn->node, &achip->conns); | |
467 | } | |
468 | ||
469 | mutex_unlock(&achip->conn_lock); | |
470 | ||
471 | if (function == ACPI_WRITE) | |
dc62b56a AL |
472 | gpiod_set_raw_value_cansleep(desc, |
473 | !!((1 << i) & *value)); | |
473ed7be | 474 | else |
dc62b56a | 475 | *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i; |
473ed7be MW |
476 | } |
477 | ||
478 | out: | |
479 | ACPI_FREE(ares); | |
480 | return status; | |
481 | } | |
482 | ||
483 | static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip) | |
484 | { | |
485 | struct gpio_chip *chip = achip->chip; | |
486 | acpi_handle handle = ACPI_HANDLE(chip->dev); | |
487 | acpi_status status; | |
488 | ||
489 | INIT_LIST_HEAD(&achip->conns); | |
490 | mutex_init(&achip->conn_lock); | |
491 | status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
492 | acpi_gpio_adr_space_handler, | |
493 | NULL, achip); | |
494 | if (ACPI_FAILURE(status)) | |
495 | dev_err(chip->dev, "Failed to install GPIO OpRegion handler\n"); | |
496 | } | |
497 | ||
498 | static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip) | |
499 | { | |
500 | struct gpio_chip *chip = achip->chip; | |
501 | acpi_handle handle = ACPI_HANDLE(chip->dev); | |
502 | struct acpi_gpio_connection *conn, *tmp; | |
503 | acpi_status status; | |
504 | ||
505 | status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
506 | acpi_gpio_adr_space_handler); | |
507 | if (ACPI_FAILURE(status)) { | |
508 | dev_err(chip->dev, "Failed to remove GPIO OpRegion handler\n"); | |
509 | return; | |
510 | } | |
511 | ||
512 | list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) { | |
513 | gpiochip_free_own_desc(conn->desc); | |
514 | list_del(&conn->node); | |
515 | kfree(conn); | |
516 | } | |
517 | } | |
518 | ||
664e3e5a MW |
519 | void acpi_gpiochip_add(struct gpio_chip *chip) |
520 | { | |
aa92b6f6 MW |
521 | struct acpi_gpio_chip *acpi_gpio; |
522 | acpi_handle handle; | |
523 | acpi_status status; | |
524 | ||
e9595f84 MW |
525 | if (!chip || !chip->dev) |
526 | return; | |
527 | ||
aa92b6f6 MW |
528 | handle = ACPI_HANDLE(chip->dev); |
529 | if (!handle) | |
530 | return; | |
531 | ||
532 | acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL); | |
533 | if (!acpi_gpio) { | |
534 | dev_err(chip->dev, | |
535 | "Failed to allocate memory for ACPI GPIO chip\n"); | |
536 | return; | |
537 | } | |
538 | ||
539 | acpi_gpio->chip = chip; | |
540 | ||
541 | status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio); | |
542 | if (ACPI_FAILURE(status)) { | |
543 | dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n"); | |
544 | kfree(acpi_gpio); | |
545 | return; | |
546 | } | |
547 | ||
473ed7be | 548 | acpi_gpiochip_request_regions(acpi_gpio); |
664e3e5a MW |
549 | } |
550 | ||
551 | void acpi_gpiochip_remove(struct gpio_chip *chip) | |
552 | { | |
aa92b6f6 MW |
553 | struct acpi_gpio_chip *acpi_gpio; |
554 | acpi_handle handle; | |
555 | acpi_status status; | |
556 | ||
e9595f84 MW |
557 | if (!chip || !chip->dev) |
558 | return; | |
559 | ||
aa92b6f6 MW |
560 | handle = ACPI_HANDLE(chip->dev); |
561 | if (!handle) | |
562 | return; | |
563 | ||
564 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
565 | if (ACPI_FAILURE(status)) { | |
566 | dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n"); | |
567 | return; | |
568 | } | |
569 | ||
473ed7be | 570 | acpi_gpiochip_free_regions(acpi_gpio); |
aa92b6f6 MW |
571 | |
572 | acpi_detach_data(handle, acpi_gpio_chip_dh); | |
573 | kfree(acpi_gpio); | |
664e3e5a | 574 | } |