Commit | Line | Data |
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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; | |
e46cf32c | 28 | struct gpio_desc *desc; |
7fc7acb9 RW |
29 | }; |
30 | ||
473ed7be MW |
31 | struct acpi_gpio_connection { |
32 | struct list_head node; | |
e46cf32c | 33 | unsigned int pin; |
473ed7be MW |
34 | struct gpio_desc *desc; |
35 | }; | |
36 | ||
aa92b6f6 | 37 | struct acpi_gpio_chip { |
473ed7be MW |
38 | /* |
39 | * ACPICA requires that the first field of the context parameter | |
40 | * passed to acpi_install_address_space_handler() is large enough | |
41 | * to hold struct acpi_connection_info. | |
42 | */ | |
43 | struct acpi_connection_info conn_info; | |
44 | struct list_head conns; | |
45 | struct mutex conn_lock; | |
aa92b6f6 | 46 | struct gpio_chip *chip; |
4b01a14b | 47 | struct list_head events; |
aa92b6f6 MW |
48 | }; |
49 | ||
e29482e8 MN |
50 | static int acpi_gpiochip_find(struct gpio_chip *gc, void *data) |
51 | { | |
52 | if (!gc->dev) | |
53 | return false; | |
54 | ||
55 | return ACPI_HANDLE(gc->dev) == data; | |
56 | } | |
57 | ||
58 | /** | |
936e15dd | 59 | * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API |
e29482e8 MN |
60 | * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1") |
61 | * @pin: ACPI GPIO pin number (0-based, controller-relative) | |
62 | * | |
936e15dd MW |
63 | * Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR |
64 | * error value | |
e29482e8 MN |
65 | */ |
66 | ||
936e15dd | 67 | static struct gpio_desc *acpi_get_gpiod(char *path, int pin) |
e29482e8 MN |
68 | { |
69 | struct gpio_chip *chip; | |
70 | acpi_handle handle; | |
71 | acpi_status status; | |
72 | ||
73 | status = acpi_get_handle(NULL, path, &handle); | |
74 | if (ACPI_FAILURE(status)) | |
936e15dd | 75 | return ERR_PTR(-ENODEV); |
e29482e8 MN |
76 | |
77 | chip = gpiochip_find(handle, acpi_gpiochip_find); | |
78 | if (!chip) | |
936e15dd | 79 | return ERR_PTR(-ENODEV); |
e29482e8 | 80 | |
936e15dd MW |
81 | if (pin < 0 || pin > chip->ngpio) |
82 | return ERR_PTR(-EINVAL); | |
e29482e8 | 83 | |
390d82e3 | 84 | return gpiochip_get_desc(chip, pin); |
e29482e8 | 85 | } |
0d1c28a4 | 86 | |
0d1c28a4 MN |
87 | static irqreturn_t acpi_gpio_irq_handler(int irq, void *data) |
88 | { | |
6072b9dc | 89 | struct acpi_gpio_event *event = data; |
0d1c28a4 | 90 | |
6072b9dc | 91 | acpi_evaluate_object(event->handle, NULL, NULL, NULL); |
0d1c28a4 MN |
92 | |
93 | return IRQ_HANDLED; | |
94 | } | |
95 | ||
7fc7acb9 RW |
96 | static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data) |
97 | { | |
4b01a14b | 98 | struct acpi_gpio_event *event = data; |
7fc7acb9 | 99 | |
4b01a14b | 100 | acpi_execute_simple_method(event->handle, NULL, event->pin); |
7fc7acb9 RW |
101 | |
102 | return IRQ_HANDLED; | |
103 | } | |
104 | ||
aa92b6f6 | 105 | static void acpi_gpio_chip_dh(acpi_handle handle, void *data) |
7fc7acb9 RW |
106 | { |
107 | /* The address of this function is used as a key. */ | |
108 | } | |
109 | ||
6072b9dc MW |
110 | static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares, |
111 | void *context) | |
0d1c28a4 | 112 | { |
6072b9dc | 113 | struct acpi_gpio_chip *acpi_gpio = context; |
aa92b6f6 | 114 | struct gpio_chip *chip = acpi_gpio->chip; |
6072b9dc | 115 | struct acpi_resource_gpio *agpio; |
7fc7acb9 | 116 | acpi_handle handle, evt_handle; |
6072b9dc MW |
117 | struct acpi_gpio_event *event; |
118 | irq_handler_t handler = NULL; | |
119 | struct gpio_desc *desc; | |
120 | unsigned long irqflags; | |
121 | int ret, pin, irq; | |
0d1c28a4 | 122 | |
6072b9dc MW |
123 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) |
124 | return AE_OK; | |
125 | ||
126 | agpio = &ares->data.gpio; | |
127 | if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT) | |
128 | return AE_OK; | |
0d1c28a4 MN |
129 | |
130 | handle = ACPI_HANDLE(chip->dev); | |
6072b9dc MW |
131 | pin = agpio->pin_table[0]; |
132 | ||
133 | if (pin <= 255) { | |
134 | char ev_name[5]; | |
135 | sprintf(ev_name, "_%c%02X", | |
136 | agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L', | |
137 | pin); | |
138 | if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle))) | |
139 | handler = acpi_gpio_irq_handler; | |
140 | } | |
141 | if (!handler) { | |
142 | if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle))) | |
143 | handler = acpi_gpio_irq_handler_evt; | |
144 | } | |
145 | if (!handler) | |
146 | return AE_BAD_PARAMETER; | |
0d1c28a4 | 147 | |
abdc08a3 | 148 | desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event"); |
6072b9dc | 149 | if (IS_ERR(desc)) { |
6072b9dc MW |
150 | dev_err(chip->dev, "Failed to request GPIO\n"); |
151 | return AE_ERROR; | |
152 | } | |
0d1c28a4 | 153 | |
6072b9dc | 154 | gpiod_direction_input(desc); |
0d1c28a4 | 155 | |
d74be6df | 156 | ret = gpio_lock_as_irq(chip, pin); |
6072b9dc MW |
157 | if (ret) { |
158 | dev_err(chip->dev, "Failed to lock GPIO as interrupt\n"); | |
159 | goto fail_free_desc; | |
160 | } | |
0d1c28a4 | 161 | |
6072b9dc MW |
162 | irq = gpiod_to_irq(desc); |
163 | if (irq < 0) { | |
164 | dev_err(chip->dev, "Failed to translate GPIO to IRQ\n"); | |
165 | goto fail_unlock_irq; | |
166 | } | |
7fc7acb9 | 167 | |
6072b9dc MW |
168 | irqflags = IRQF_ONESHOT; |
169 | if (agpio->triggering == ACPI_LEVEL_SENSITIVE) { | |
170 | if (agpio->polarity == ACPI_ACTIVE_HIGH) | |
171 | irqflags |= IRQF_TRIGGER_HIGH; | |
172 | else | |
173 | irqflags |= IRQF_TRIGGER_LOW; | |
174 | } else { | |
175 | switch (agpio->polarity) { | |
176 | case ACPI_ACTIVE_HIGH: | |
177 | irqflags |= IRQF_TRIGGER_RISING; | |
178 | break; | |
179 | case ACPI_ACTIVE_LOW: | |
180 | irqflags |= IRQF_TRIGGER_FALLING; | |
181 | break; | |
182 | default: | |
183 | irqflags |= IRQF_TRIGGER_RISING | | |
184 | IRQF_TRIGGER_FALLING; | |
185 | break; | |
7fc7acb9 | 186 | } |
6072b9dc | 187 | } |
aa92b6f6 | 188 | |
6072b9dc MW |
189 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
190 | if (!event) | |
191 | goto fail_unlock_irq; | |
7fc7acb9 | 192 | |
6072b9dc MW |
193 | event->handle = evt_handle; |
194 | event->irq = irq; | |
195 | event->pin = pin; | |
e46cf32c | 196 | event->desc = desc; |
7fc7acb9 | 197 | |
6072b9dc MW |
198 | ret = request_threaded_irq(event->irq, NULL, handler, irqflags, |
199 | "ACPI:Event", event); | |
200 | if (ret) { | |
201 | dev_err(chip->dev, "Failed to setup interrupt handler for %d\n", | |
202 | event->irq); | |
203 | goto fail_free_event; | |
0d1c28a4 | 204 | } |
6072b9dc MW |
205 | |
206 | list_add_tail(&event->node, &acpi_gpio->events); | |
207 | return AE_OK; | |
208 | ||
209 | fail_free_event: | |
210 | kfree(event); | |
211 | fail_unlock_irq: | |
d74be6df | 212 | gpio_unlock_as_irq(chip, pin); |
6072b9dc MW |
213 | fail_free_desc: |
214 | gpiochip_free_own_desc(desc); | |
215 | ||
216 | return AE_ERROR; | |
0d1c28a4 | 217 | } |
7fc7acb9 | 218 | |
70b53411 | 219 | /** |
6072b9dc | 220 | * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events |
afa82fab | 221 | * @chip: GPIO chip |
70b53411 | 222 | * |
6072b9dc MW |
223 | * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are |
224 | * handled by ACPI event methods which need to be called from the GPIO | |
225 | * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which | |
226 | * gpio pins have acpi event methods and assigns interrupt handlers that calls | |
227 | * the acpi event methods for those pins. | |
228 | */ | |
afa82fab | 229 | void acpi_gpiochip_request_interrupts(struct gpio_chip *chip) |
6072b9dc | 230 | { |
afa82fab MW |
231 | struct acpi_gpio_chip *acpi_gpio; |
232 | acpi_handle handle; | |
233 | acpi_status status; | |
234 | ||
235 | if (!chip->dev || !chip->to_irq) | |
236 | return; | |
6072b9dc | 237 | |
afa82fab MW |
238 | handle = ACPI_HANDLE(chip->dev); |
239 | if (!handle) | |
240 | return; | |
241 | ||
242 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
243 | if (ACPI_FAILURE(status)) | |
6072b9dc MW |
244 | return; |
245 | ||
246 | INIT_LIST_HEAD(&acpi_gpio->events); | |
247 | acpi_walk_resources(ACPI_HANDLE(chip->dev), "_AEI", | |
248 | acpi_gpiochip_request_interrupt, acpi_gpio); | |
249 | } | |
250 | ||
251 | /** | |
252 | * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts. | |
afa82fab | 253 | * @chip: GPIO chip |
70b53411 | 254 | * |
6072b9dc MW |
255 | * Free interrupts associated with GPIO ACPI event method for the given |
256 | * GPIO chip. | |
70b53411 | 257 | */ |
afa82fab | 258 | void acpi_gpiochip_free_interrupts(struct gpio_chip *chip) |
70b53411 | 259 | { |
afa82fab | 260 | struct acpi_gpio_chip *acpi_gpio; |
4b01a14b | 261 | struct acpi_gpio_event *event, *ep; |
afa82fab MW |
262 | acpi_handle handle; |
263 | acpi_status status; | |
264 | ||
265 | if (!chip->dev || !chip->to_irq) | |
266 | return; | |
70b53411 | 267 | |
afa82fab MW |
268 | handle = ACPI_HANDLE(chip->dev); |
269 | if (!handle) | |
270 | return; | |
271 | ||
272 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
273 | if (ACPI_FAILURE(status)) | |
70b53411 MW |
274 | return; |
275 | ||
4b01a14b | 276 | list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) { |
6072b9dc MW |
277 | struct gpio_desc *desc; |
278 | ||
279 | free_irq(event->irq, event); | |
e46cf32c | 280 | desc = event->desc; |
6072b9dc MW |
281 | if (WARN_ON(IS_ERR(desc))) |
282 | continue; | |
d74be6df | 283 | gpio_unlock_as_irq(chip, event->pin); |
6072b9dc | 284 | gpiochip_free_own_desc(desc); |
4b01a14b MW |
285 | list_del(&event->node); |
286 | kfree(event); | |
70b53411 | 287 | } |
70b53411 | 288 | } |
70b53411 | 289 | |
12028d2d MW |
290 | struct acpi_gpio_lookup { |
291 | struct acpi_gpio_info info; | |
292 | int index; | |
936e15dd | 293 | struct gpio_desc *desc; |
12028d2d MW |
294 | int n; |
295 | }; | |
296 | ||
297 | static int acpi_find_gpio(struct acpi_resource *ares, void *data) | |
298 | { | |
299 | struct acpi_gpio_lookup *lookup = data; | |
300 | ||
301 | if (ares->type != ACPI_RESOURCE_TYPE_GPIO) | |
302 | return 1; | |
303 | ||
936e15dd | 304 | if (lookup->n++ == lookup->index && !lookup->desc) { |
12028d2d MW |
305 | const struct acpi_resource_gpio *agpio = &ares->data.gpio; |
306 | ||
936e15dd MW |
307 | lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr, |
308 | agpio->pin_table[0]); | |
12028d2d MW |
309 | lookup->info.gpioint = |
310 | agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT; | |
e01f440a MW |
311 | lookup->info.active_low = |
312 | agpio->polarity == ACPI_ACTIVE_LOW; | |
12028d2d MW |
313 | } |
314 | ||
315 | return 1; | |
316 | } | |
317 | ||
318 | /** | |
936e15dd | 319 | * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources |
12028d2d MW |
320 | * @dev: pointer to a device to get GPIO from |
321 | * @index: index of GpioIo/GpioInt resource (starting from %0) | |
322 | * @info: info pointer to fill in (optional) | |
323 | * | |
324 | * Function goes through ACPI resources for @dev and based on @index looks | |
936e15dd | 325 | * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor, |
12028d2d MW |
326 | * and returns it. @index matches GpioIo/GpioInt resources only so if there |
327 | * are total %3 GPIO resources, the index goes from %0 to %2. | |
328 | * | |
936e15dd | 329 | * If the GPIO cannot be translated or there is an error an ERR_PTR is |
12028d2d MW |
330 | * returned. |
331 | * | |
332 | * Note: if the GPIO resource has multiple entries in the pin list, this | |
333 | * function only returns the first. | |
334 | */ | |
936e15dd MW |
335 | struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index, |
336 | struct acpi_gpio_info *info) | |
12028d2d MW |
337 | { |
338 | struct acpi_gpio_lookup lookup; | |
339 | struct list_head resource_list; | |
340 | struct acpi_device *adev; | |
341 | acpi_handle handle; | |
342 | int ret; | |
343 | ||
344 | if (!dev) | |
936e15dd | 345 | return ERR_PTR(-EINVAL); |
12028d2d MW |
346 | |
347 | handle = ACPI_HANDLE(dev); | |
348 | if (!handle || acpi_bus_get_device(handle, &adev)) | |
936e15dd | 349 | return ERR_PTR(-ENODEV); |
12028d2d MW |
350 | |
351 | memset(&lookup, 0, sizeof(lookup)); | |
352 | lookup.index = index; | |
12028d2d MW |
353 | |
354 | INIT_LIST_HEAD(&resource_list); | |
355 | ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio, | |
356 | &lookup); | |
357 | if (ret < 0) | |
936e15dd | 358 | return ERR_PTR(ret); |
12028d2d MW |
359 | |
360 | acpi_dev_free_resource_list(&resource_list); | |
361 | ||
936e15dd | 362 | if (lookup.desc && info) |
12028d2d MW |
363 | *info = lookup.info; |
364 | ||
a00580c2 | 365 | return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT); |
12028d2d | 366 | } |
664e3e5a | 367 | |
473ed7be MW |
368 | static acpi_status |
369 | acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address, | |
370 | u32 bits, u64 *value, void *handler_context, | |
371 | void *region_context) | |
372 | { | |
373 | struct acpi_gpio_chip *achip = region_context; | |
374 | struct gpio_chip *chip = achip->chip; | |
375 | struct acpi_resource_gpio *agpio; | |
376 | struct acpi_resource *ares; | |
c15d821d | 377 | int pin_index = (int)address; |
473ed7be MW |
378 | acpi_status status; |
379 | bool pull_up; | |
c15d821d | 380 | int length; |
473ed7be MW |
381 | int i; |
382 | ||
383 | status = acpi_buffer_to_resource(achip->conn_info.connection, | |
384 | achip->conn_info.length, &ares); | |
385 | if (ACPI_FAILURE(status)) | |
386 | return status; | |
387 | ||
388 | if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) { | |
389 | ACPI_FREE(ares); | |
390 | return AE_BAD_PARAMETER; | |
391 | } | |
392 | ||
393 | agpio = &ares->data.gpio; | |
394 | pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP; | |
395 | ||
396 | if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT && | |
397 | function == ACPI_WRITE)) { | |
398 | ACPI_FREE(ares); | |
399 | return AE_BAD_PARAMETER; | |
400 | } | |
401 | ||
c15d821d SP |
402 | length = min(agpio->pin_table_length, (u16)(pin_index + bits)); |
403 | for (i = pin_index; i < length; ++i) { | |
473ed7be MW |
404 | unsigned pin = agpio->pin_table[i]; |
405 | struct acpi_gpio_connection *conn; | |
406 | struct gpio_desc *desc; | |
407 | bool found; | |
408 | ||
473ed7be MW |
409 | mutex_lock(&achip->conn_lock); |
410 | ||
411 | found = false; | |
412 | list_for_each_entry(conn, &achip->conns, node) { | |
e46cf32c | 413 | if (conn->pin == pin) { |
473ed7be | 414 | found = true; |
e46cf32c | 415 | desc = conn->desc; |
473ed7be MW |
416 | break; |
417 | } | |
418 | } | |
419 | if (!found) { | |
abdc08a3 AC |
420 | desc = gpiochip_request_own_desc(chip, pin, |
421 | "ACPI:OpRegion"); | |
e46cf32c | 422 | if (IS_ERR(desc)) { |
473ed7be MW |
423 | status = AE_ERROR; |
424 | mutex_unlock(&achip->conn_lock); | |
425 | goto out; | |
426 | } | |
427 | ||
428 | switch (agpio->io_restriction) { | |
429 | case ACPI_IO_RESTRICT_INPUT: | |
430 | gpiod_direction_input(desc); | |
431 | break; | |
432 | case ACPI_IO_RESTRICT_OUTPUT: | |
433 | /* | |
434 | * ACPI GPIO resources don't contain an | |
435 | * initial value for the GPIO. Therefore we | |
436 | * deduce that value from the pull field | |
437 | * instead. If the pin is pulled up we | |
438 | * assume default to be high, otherwise | |
439 | * low. | |
440 | */ | |
441 | gpiod_direction_output(desc, pull_up); | |
442 | break; | |
443 | default: | |
444 | /* | |
445 | * Assume that the BIOS has configured the | |
446 | * direction and pull accordingly. | |
447 | */ | |
448 | break; | |
449 | } | |
450 | ||
451 | conn = kzalloc(sizeof(*conn), GFP_KERNEL); | |
452 | if (!conn) { | |
453 | status = AE_NO_MEMORY; | |
454 | gpiochip_free_own_desc(desc); | |
455 | mutex_unlock(&achip->conn_lock); | |
456 | goto out; | |
457 | } | |
458 | ||
e46cf32c | 459 | conn->pin = pin; |
473ed7be MW |
460 | conn->desc = desc; |
461 | list_add_tail(&conn->node, &achip->conns); | |
462 | } | |
463 | ||
464 | mutex_unlock(&achip->conn_lock); | |
465 | ||
466 | if (function == ACPI_WRITE) | |
dc62b56a AL |
467 | gpiod_set_raw_value_cansleep(desc, |
468 | !!((1 << i) & *value)); | |
473ed7be | 469 | else |
dc62b56a | 470 | *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i; |
473ed7be MW |
471 | } |
472 | ||
473 | out: | |
474 | ACPI_FREE(ares); | |
475 | return status; | |
476 | } | |
477 | ||
478 | static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip) | |
479 | { | |
480 | struct gpio_chip *chip = achip->chip; | |
481 | acpi_handle handle = ACPI_HANDLE(chip->dev); | |
482 | acpi_status status; | |
483 | ||
484 | INIT_LIST_HEAD(&achip->conns); | |
485 | mutex_init(&achip->conn_lock); | |
486 | status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
487 | acpi_gpio_adr_space_handler, | |
488 | NULL, achip); | |
489 | if (ACPI_FAILURE(status)) | |
490 | dev_err(chip->dev, "Failed to install GPIO OpRegion handler\n"); | |
491 | } | |
492 | ||
493 | static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip) | |
494 | { | |
495 | struct gpio_chip *chip = achip->chip; | |
496 | acpi_handle handle = ACPI_HANDLE(chip->dev); | |
497 | struct acpi_gpio_connection *conn, *tmp; | |
498 | acpi_status status; | |
499 | ||
500 | status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO, | |
501 | acpi_gpio_adr_space_handler); | |
502 | if (ACPI_FAILURE(status)) { | |
503 | dev_err(chip->dev, "Failed to remove GPIO OpRegion handler\n"); | |
504 | return; | |
505 | } | |
506 | ||
507 | list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) { | |
508 | gpiochip_free_own_desc(conn->desc); | |
509 | list_del(&conn->node); | |
510 | kfree(conn); | |
511 | } | |
512 | } | |
513 | ||
664e3e5a MW |
514 | void acpi_gpiochip_add(struct gpio_chip *chip) |
515 | { | |
aa92b6f6 MW |
516 | struct acpi_gpio_chip *acpi_gpio; |
517 | acpi_handle handle; | |
518 | acpi_status status; | |
519 | ||
e9595f84 MW |
520 | if (!chip || !chip->dev) |
521 | return; | |
522 | ||
aa92b6f6 MW |
523 | handle = ACPI_HANDLE(chip->dev); |
524 | if (!handle) | |
525 | return; | |
526 | ||
527 | acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL); | |
528 | if (!acpi_gpio) { | |
529 | dev_err(chip->dev, | |
530 | "Failed to allocate memory for ACPI GPIO chip\n"); | |
531 | return; | |
532 | } | |
533 | ||
534 | acpi_gpio->chip = chip; | |
535 | ||
536 | status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio); | |
537 | if (ACPI_FAILURE(status)) { | |
538 | dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n"); | |
539 | kfree(acpi_gpio); | |
540 | return; | |
541 | } | |
542 | ||
473ed7be | 543 | acpi_gpiochip_request_regions(acpi_gpio); |
664e3e5a MW |
544 | } |
545 | ||
546 | void acpi_gpiochip_remove(struct gpio_chip *chip) | |
547 | { | |
aa92b6f6 MW |
548 | struct acpi_gpio_chip *acpi_gpio; |
549 | acpi_handle handle; | |
550 | acpi_status status; | |
551 | ||
e9595f84 MW |
552 | if (!chip || !chip->dev) |
553 | return; | |
554 | ||
aa92b6f6 MW |
555 | handle = ACPI_HANDLE(chip->dev); |
556 | if (!handle) | |
557 | return; | |
558 | ||
559 | status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio); | |
560 | if (ACPI_FAILURE(status)) { | |
561 | dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n"); | |
562 | return; | |
563 | } | |
564 | ||
473ed7be | 565 | acpi_gpiochip_free_regions(acpi_gpio); |
aa92b6f6 MW |
566 | |
567 | acpi_detach_data(handle, acpi_gpio_chip_dh); | |
568 | kfree(acpi_gpio); | |
664e3e5a | 569 | } |