GPIO / ACPI: export acpi_gpiochip_request(free)_interrupts for module use
[linux-2.6-block.git] / drivers / gpio / gpiolib-acpi.c
CommitLineData
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>
354567e6 14#include <linux/gpio.h>
936e15dd 15#include <linux/gpio/consumer.h>
5ccff852 16#include <linux/gpio/driver.h>
e29482e8 17#include <linux/export.h>
e29482e8 18#include <linux/acpi.h>
0d1c28a4 19#include <linux/interrupt.h>
473ed7be 20#include <linux/mutex.h>
354567e6 21#include <linux/pinctrl/pinctrl.h>
e29482e8 22
5ccff852
MW
23#include "gpiolib.h"
24
4b01a14b 25struct acpi_gpio_event {
7fc7acb9 26 struct list_head node;
4b01a14b 27 acpi_handle handle;
7fc7acb9
RW
28 unsigned int pin;
29 unsigned int irq;
e46cf32c 30 struct gpio_desc *desc;
7fc7acb9
RW
31};
32
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MW
33struct acpi_gpio_connection {
34 struct list_head node;
e46cf32c 35 unsigned int pin;
473ed7be
MW
36 struct gpio_desc *desc;
37};
38
aa92b6f6 39struct acpi_gpio_chip {
473ed7be
MW
40 /*
41 * ACPICA requires that the first field of the context parameter
42 * passed to acpi_install_address_space_handler() is large enough
43 * to hold struct acpi_connection_info.
44 */
45 struct acpi_connection_info conn_info;
46 struct list_head conns;
47 struct mutex conn_lock;
aa92b6f6 48 struct gpio_chip *chip;
4b01a14b 49 struct list_head events;
aa92b6f6
MW
50};
51
e29482e8
MN
52static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
53{
54 if (!gc->dev)
55 return false;
56
57 return ACPI_HANDLE(gc->dev) == data;
58}
59
354567e6
MW
60#ifdef CONFIG_PINCTRL
61/**
62 * acpi_gpiochip_pin_to_gpio_offset() - translates ACPI GPIO to Linux GPIO
63 * @chip: GPIO chip
64 * @pin: ACPI GPIO pin number from GpioIo/GpioInt resource
65 *
66 * Function takes ACPI GpioIo/GpioInt pin number as a parameter and
67 * translates it to a corresponding offset suitable to be passed to a
68 * GPIO controller driver.
69 *
70 * Typically the returned offset is same as @pin, but if the GPIO
71 * controller uses pin controller and the mapping is not contigous the
72 * offset might be different.
73 */
74static int acpi_gpiochip_pin_to_gpio_offset(struct gpio_chip *chip, int pin)
75{
76 struct gpio_pin_range *pin_range;
77
78 /* If there are no ranges in this chip, use 1:1 mapping */
79 if (list_empty(&chip->pin_ranges))
80 return pin;
81
82 list_for_each_entry(pin_range, &chip->pin_ranges, node) {
83 const struct pinctrl_gpio_range *range = &pin_range->range;
84 int i;
85
86 if (range->pins) {
87 for (i = 0; i < range->npins; i++) {
88 if (range->pins[i] == pin)
89 return range->base + i - chip->base;
90 }
91 } else {
92 if (pin >= range->pin_base &&
93 pin < range->pin_base + range->npins) {
94 unsigned gpio_base;
95
96 gpio_base = range->base - chip->base;
97 return gpio_base + pin - range->pin_base;
98 }
99 }
100 }
101
102 return -EINVAL;
103}
104#else
105static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_chip *chip,
106 int pin)
107{
108 return pin;
109}
110#endif
111
e29482e8 112/**
936e15dd 113 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
e29482e8
MN
114 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
115 * @pin: ACPI GPIO pin number (0-based, controller-relative)
116 *
936e15dd
MW
117 * Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
118 * error value
e29482e8
MN
119 */
120
936e15dd 121static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
e29482e8
MN
122{
123 struct gpio_chip *chip;
124 acpi_handle handle;
125 acpi_status status;
354567e6 126 int offset;
e29482e8
MN
127
128 status = acpi_get_handle(NULL, path, &handle);
129 if (ACPI_FAILURE(status))
936e15dd 130 return ERR_PTR(-ENODEV);
e29482e8
MN
131
132 chip = gpiochip_find(handle, acpi_gpiochip_find);
133 if (!chip)
936e15dd 134 return ERR_PTR(-ENODEV);
e29482e8 135
354567e6
MW
136 offset = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
137 if (offset < 0)
138 return ERR_PTR(offset);
e29482e8 139
354567e6 140 return gpiochip_get_desc(chip, offset);
e29482e8 141}
0d1c28a4 142
0d1c28a4
MN
143static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
144{
6072b9dc 145 struct acpi_gpio_event *event = data;
0d1c28a4 146
6072b9dc 147 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
0d1c28a4
MN
148
149 return IRQ_HANDLED;
150}
151
7fc7acb9
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152static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
153{
4b01a14b 154 struct acpi_gpio_event *event = data;
7fc7acb9 155
4b01a14b 156 acpi_execute_simple_method(event->handle, NULL, event->pin);
7fc7acb9
RW
157
158 return IRQ_HANDLED;
159}
160
aa92b6f6 161static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
7fc7acb9
RW
162{
163 /* The address of this function is used as a key. */
164}
165
6072b9dc
MW
166static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
167 void *context)
0d1c28a4 168{
6072b9dc 169 struct acpi_gpio_chip *acpi_gpio = context;
aa92b6f6 170 struct gpio_chip *chip = acpi_gpio->chip;
6072b9dc 171 struct acpi_resource_gpio *agpio;
7fc7acb9 172 acpi_handle handle, evt_handle;
6072b9dc
MW
173 struct acpi_gpio_event *event;
174 irq_handler_t handler = NULL;
175 struct gpio_desc *desc;
176 unsigned long irqflags;
177 int ret, pin, irq;
0d1c28a4 178
6072b9dc
MW
179 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
180 return AE_OK;
181
182 agpio = &ares->data.gpio;
183 if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
184 return AE_OK;
0d1c28a4
MN
185
186 handle = ACPI_HANDLE(chip->dev);
6072b9dc
MW
187 pin = agpio->pin_table[0];
188
189 if (pin <= 255) {
190 char ev_name[5];
191 sprintf(ev_name, "_%c%02X",
192 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
193 pin);
194 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
195 handler = acpi_gpio_irq_handler;
196 }
197 if (!handler) {
198 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
199 handler = acpi_gpio_irq_handler_evt;
200 }
201 if (!handler)
202 return AE_BAD_PARAMETER;
0d1c28a4 203
4de60970 204 pin = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
205 if (pin < 0)
206 return AE_BAD_PARAMETER;
207
abdc08a3 208 desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
6072b9dc 209 if (IS_ERR(desc)) {
6072b9dc
MW
210 dev_err(chip->dev, "Failed to request GPIO\n");
211 return AE_ERROR;
212 }
0d1c28a4 213
6072b9dc 214 gpiod_direction_input(desc);
0d1c28a4 215
e3a2e878 216 ret = gpiochip_lock_as_irq(chip, pin);
6072b9dc
MW
217 if (ret) {
218 dev_err(chip->dev, "Failed to lock GPIO as interrupt\n");
219 goto fail_free_desc;
220 }
0d1c28a4 221
6072b9dc
MW
222 irq = gpiod_to_irq(desc);
223 if (irq < 0) {
224 dev_err(chip->dev, "Failed to translate GPIO to IRQ\n");
225 goto fail_unlock_irq;
226 }
7fc7acb9 227
6072b9dc
MW
228 irqflags = IRQF_ONESHOT;
229 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
230 if (agpio->polarity == ACPI_ACTIVE_HIGH)
231 irqflags |= IRQF_TRIGGER_HIGH;
232 else
233 irqflags |= IRQF_TRIGGER_LOW;
234 } else {
235 switch (agpio->polarity) {
236 case ACPI_ACTIVE_HIGH:
237 irqflags |= IRQF_TRIGGER_RISING;
238 break;
239 case ACPI_ACTIVE_LOW:
240 irqflags |= IRQF_TRIGGER_FALLING;
241 break;
242 default:
243 irqflags |= IRQF_TRIGGER_RISING |
244 IRQF_TRIGGER_FALLING;
245 break;
7fc7acb9 246 }
6072b9dc 247 }
aa92b6f6 248
6072b9dc
MW
249 event = kzalloc(sizeof(*event), GFP_KERNEL);
250 if (!event)
251 goto fail_unlock_irq;
7fc7acb9 252
6072b9dc
MW
253 event->handle = evt_handle;
254 event->irq = irq;
255 event->pin = pin;
e46cf32c 256 event->desc = desc;
7fc7acb9 257
6072b9dc
MW
258 ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
259 "ACPI:Event", event);
260 if (ret) {
261 dev_err(chip->dev, "Failed to setup interrupt handler for %d\n",
262 event->irq);
263 goto fail_free_event;
0d1c28a4 264 }
6072b9dc
MW
265
266 list_add_tail(&event->node, &acpi_gpio->events);
267 return AE_OK;
268
269fail_free_event:
270 kfree(event);
271fail_unlock_irq:
e3a2e878 272 gpiochip_unlock_as_irq(chip, pin);
6072b9dc
MW
273fail_free_desc:
274 gpiochip_free_own_desc(desc);
275
276 return AE_ERROR;
0d1c28a4 277}
7fc7acb9 278
70b53411 279/**
6072b9dc 280 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
afa82fab 281 * @chip: GPIO chip
70b53411 282 *
6072b9dc
MW
283 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
284 * handled by ACPI event methods which need to be called from the GPIO
285 * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
286 * gpio pins have acpi event methods and assigns interrupt handlers that calls
287 * the acpi event methods for those pins.
288 */
afa82fab 289void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
6072b9dc 290{
afa82fab
MW
291 struct acpi_gpio_chip *acpi_gpio;
292 acpi_handle handle;
293 acpi_status status;
294
295 if (!chip->dev || !chip->to_irq)
296 return;
6072b9dc 297
afa82fab
MW
298 handle = ACPI_HANDLE(chip->dev);
299 if (!handle)
300 return;
301
302 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
303 if (ACPI_FAILURE(status))
6072b9dc
MW
304 return;
305
306 INIT_LIST_HEAD(&acpi_gpio->events);
1ecb016e 307 acpi_walk_resources(handle, "_AEI",
6072b9dc
MW
308 acpi_gpiochip_request_interrupt, acpi_gpio);
309}
2b528fff 310EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
6072b9dc
MW
311
312/**
313 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
afa82fab 314 * @chip: GPIO chip
70b53411 315 *
6072b9dc
MW
316 * Free interrupts associated with GPIO ACPI event method for the given
317 * GPIO chip.
70b53411 318 */
afa82fab 319void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
70b53411 320{
afa82fab 321 struct acpi_gpio_chip *acpi_gpio;
4b01a14b 322 struct acpi_gpio_event *event, *ep;
afa82fab
MW
323 acpi_handle handle;
324 acpi_status status;
325
326 if (!chip->dev || !chip->to_irq)
327 return;
70b53411 328
afa82fab
MW
329 handle = ACPI_HANDLE(chip->dev);
330 if (!handle)
331 return;
332
333 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
334 if (ACPI_FAILURE(status))
70b53411
MW
335 return;
336
4b01a14b 337 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
6072b9dc
MW
338 struct gpio_desc *desc;
339
340 free_irq(event->irq, event);
e46cf32c 341 desc = event->desc;
6072b9dc
MW
342 if (WARN_ON(IS_ERR(desc)))
343 continue;
e3a2e878 344 gpiochip_unlock_as_irq(chip, event->pin);
6072b9dc 345 gpiochip_free_own_desc(desc);
4b01a14b
MW
346 list_del(&event->node);
347 kfree(event);
70b53411 348 }
70b53411 349}
2b528fff 350EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
70b53411 351
f028d524
RW
352int acpi_dev_add_driver_gpios(struct acpi_device *adev,
353 const struct acpi_gpio_mapping *gpios)
354{
355 if (adev && gpios) {
356 adev->driver_gpios = gpios;
357 return 0;
358 }
359 return -EINVAL;
360}
361EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
362
363static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
364 const char *name, int index,
365 struct acpi_reference_args *args)
366{
367 const struct acpi_gpio_mapping *gm;
368
369 if (!adev->driver_gpios)
370 return false;
371
372 for (gm = adev->driver_gpios; gm->name; gm++)
373 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
374 const struct acpi_gpio_params *par = gm->data + index;
375
376 args->adev = adev;
377 args->args[0] = par->crs_entry_index;
378 args->args[1] = par->line_index;
379 args->args[2] = par->active_low;
380 args->nargs = 3;
381 return true;
382 }
383
384 return false;
385}
386
12028d2d
MW
387struct acpi_gpio_lookup {
388 struct acpi_gpio_info info;
389 int index;
0d9a693c 390 int pin_index;
936e15dd 391 struct gpio_desc *desc;
12028d2d
MW
392 int n;
393};
394
395static int acpi_find_gpio(struct acpi_resource *ares, void *data)
396{
397 struct acpi_gpio_lookup *lookup = data;
398
399 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
400 return 1;
401
936e15dd 402 if (lookup->n++ == lookup->index && !lookup->desc) {
12028d2d 403 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
0d9a693c
MW
404 int pin_index = lookup->pin_index;
405
406 if (pin_index >= agpio->pin_table_length)
407 return 1;
12028d2d 408
936e15dd 409 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
0d9a693c 410 agpio->pin_table[pin_index]);
12028d2d
MW
411 lookup->info.gpioint =
412 agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
0d9a693c
MW
413
414 /*
415 * ActiveLow is only specified for GpioInt resource. If
416 * GpioIo is used then the only way to set the flag is
417 * to use _DSD "gpios" property.
418 */
419 if (lookup->info.gpioint)
420 lookup->info.active_low =
421 agpio->polarity == ACPI_ACTIVE_LOW;
12028d2d
MW
422 }
423
424 return 1;
425}
426
427/**
936e15dd 428 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
0d9a693c
MW
429 * @adev: pointer to a ACPI device to get GPIO from
430 * @propname: Property name of the GPIO (optional)
12028d2d
MW
431 * @index: index of GpioIo/GpioInt resource (starting from %0)
432 * @info: info pointer to fill in (optional)
433 *
0d9a693c 434 * Function goes through ACPI resources for @adev and based on @index looks
936e15dd 435 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
12028d2d
MW
436 * and returns it. @index matches GpioIo/GpioInt resources only so if there
437 * are total %3 GPIO resources, the index goes from %0 to %2.
438 *
0d9a693c
MW
439 * If @propname is specified the GPIO is looked using device property. In
440 * that case @index is used to select the GPIO entry in the property value
441 * (in case of multiple).
442 *
936e15dd 443 * If the GPIO cannot be translated or there is an error an ERR_PTR is
12028d2d
MW
444 * returned.
445 *
446 * Note: if the GPIO resource has multiple entries in the pin list, this
447 * function only returns the first.
448 */
0d9a693c
MW
449struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
450 const char *propname, int index,
936e15dd 451 struct acpi_gpio_info *info)
12028d2d
MW
452{
453 struct acpi_gpio_lookup lookup;
454 struct list_head resource_list;
0d9a693c 455 bool active_low = false;
12028d2d
MW
456 int ret;
457
0d9a693c 458 if (!adev)
936e15dd 459 return ERR_PTR(-ENODEV);
12028d2d
MW
460
461 memset(&lookup, 0, sizeof(lookup));
462 lookup.index = index;
12028d2d 463
0d9a693c
MW
464 if (propname) {
465 struct acpi_reference_args args;
466
467 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
468
469 memset(&args, 0, sizeof(args));
60ba032e 470 ret = acpi_dev_get_property_reference(adev, propname,
0d9a693c 471 index, &args);
f028d524
RW
472 if (ret) {
473 bool found = acpi_get_driver_gpio_data(adev, propname,
474 index, &args);
475 if (!found)
476 return ERR_PTR(ret);
477 }
0d9a693c
MW
478
479 /*
480 * The property was found and resolved so need to
481 * lookup the GPIO based on returned args instead.
482 */
483 adev = args.adev;
484 if (args.nargs >= 2) {
485 lookup.index = args.args[0];
486 lookup.pin_index = args.args[1];
487 /*
488 * 3rd argument, if present is used to
489 * specify active_low.
490 */
491 if (args.nargs >= 3)
492 active_low = !!args.args[2];
493 }
494
495 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %zd %llu %llu %llu\n",
496 dev_name(&adev->dev), args.nargs,
497 args.args[0], args.args[1], args.args[2]);
498 } else {
499 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
500 }
501
12028d2d
MW
502 INIT_LIST_HEAD(&resource_list);
503 ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio,
504 &lookup);
505 if (ret < 0)
936e15dd 506 return ERR_PTR(ret);
12028d2d
MW
507
508 acpi_dev_free_resource_list(&resource_list);
509
0d9a693c 510 if (lookup.desc && info) {
12028d2d 511 *info = lookup.info;
0d9a693c
MW
512 if (active_low)
513 info->active_low = active_low;
514 }
12028d2d 515
a00580c2 516 return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
12028d2d 517}
664e3e5a 518
c884fbd4
MW
519/**
520 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
521 * @adev: pointer to a ACPI device to get IRQ from
522 * @index: index of GpioInt resource (starting from %0)
523 *
524 * If the device has one or more GpioInt resources, this function can be
525 * used to translate from the GPIO offset in the resource to the Linux IRQ
526 * number.
527 *
528 * Return: Linux IRQ number (>%0) on success, negative errno on failure.
529 */
530int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
531{
532 int idx, i;
533
534 for (i = 0, idx = 0; idx <= index; i++) {
535 struct acpi_gpio_info info;
536 struct gpio_desc *desc;
537
538 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
539 if (IS_ERR(desc))
540 break;
541 if (info.gpioint && idx++ == index)
542 return gpiod_to_irq(desc);
543 }
544 return -ENOENT;
545}
546EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
547
473ed7be
MW
548static acpi_status
549acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
550 u32 bits, u64 *value, void *handler_context,
551 void *region_context)
552{
553 struct acpi_gpio_chip *achip = region_context;
554 struct gpio_chip *chip = achip->chip;
555 struct acpi_resource_gpio *agpio;
556 struct acpi_resource *ares;
c15d821d 557 int pin_index = (int)address;
473ed7be
MW
558 acpi_status status;
559 bool pull_up;
c15d821d 560 int length;
473ed7be
MW
561 int i;
562
563 status = acpi_buffer_to_resource(achip->conn_info.connection,
564 achip->conn_info.length, &ares);
565 if (ACPI_FAILURE(status))
566 return status;
567
568 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
569 ACPI_FREE(ares);
570 return AE_BAD_PARAMETER;
571 }
572
573 agpio = &ares->data.gpio;
574 pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
575
576 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
577 function == ACPI_WRITE)) {
578 ACPI_FREE(ares);
579 return AE_BAD_PARAMETER;
580 }
581
c15d821d
SP
582 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
583 for (i = pin_index; i < length; ++i) {
a4811622 584 int pin = agpio->pin_table[i];
473ed7be
MW
585 struct acpi_gpio_connection *conn;
586 struct gpio_desc *desc;
587 bool found;
588
4de60970 589 pin = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
590 if (pin < 0) {
591 status = AE_BAD_PARAMETER;
592 goto out;
593 }
594
473ed7be
MW
595 mutex_lock(&achip->conn_lock);
596
597 found = false;
598 list_for_each_entry(conn, &achip->conns, node) {
e46cf32c 599 if (conn->pin == pin) {
473ed7be 600 found = true;
e46cf32c 601 desc = conn->desc;
473ed7be
MW
602 break;
603 }
604 }
605 if (!found) {
abdc08a3
AC
606 desc = gpiochip_request_own_desc(chip, pin,
607 "ACPI:OpRegion");
e46cf32c 608 if (IS_ERR(desc)) {
473ed7be
MW
609 status = AE_ERROR;
610 mutex_unlock(&achip->conn_lock);
611 goto out;
612 }
613
614 switch (agpio->io_restriction) {
615 case ACPI_IO_RESTRICT_INPUT:
616 gpiod_direction_input(desc);
617 break;
618 case ACPI_IO_RESTRICT_OUTPUT:
619 /*
620 * ACPI GPIO resources don't contain an
621 * initial value for the GPIO. Therefore we
622 * deduce that value from the pull field
623 * instead. If the pin is pulled up we
624 * assume default to be high, otherwise
625 * low.
626 */
627 gpiod_direction_output(desc, pull_up);
628 break;
629 default:
630 /*
631 * Assume that the BIOS has configured the
632 * direction and pull accordingly.
633 */
634 break;
635 }
636
637 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
638 if (!conn) {
639 status = AE_NO_MEMORY;
640 gpiochip_free_own_desc(desc);
641 mutex_unlock(&achip->conn_lock);
642 goto out;
643 }
644
e46cf32c 645 conn->pin = pin;
473ed7be
MW
646 conn->desc = desc;
647 list_add_tail(&conn->node, &achip->conns);
648 }
649
650 mutex_unlock(&achip->conn_lock);
651
652 if (function == ACPI_WRITE)
dc62b56a
AL
653 gpiod_set_raw_value_cansleep(desc,
654 !!((1 << i) & *value));
473ed7be 655 else
dc62b56a 656 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
473ed7be
MW
657 }
658
659out:
660 ACPI_FREE(ares);
661 return status;
662}
663
664static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
665{
666 struct gpio_chip *chip = achip->chip;
667 acpi_handle handle = ACPI_HANDLE(chip->dev);
668 acpi_status status;
669
670 INIT_LIST_HEAD(&achip->conns);
671 mutex_init(&achip->conn_lock);
672 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
673 acpi_gpio_adr_space_handler,
674 NULL, achip);
675 if (ACPI_FAILURE(status))
676 dev_err(chip->dev, "Failed to install GPIO OpRegion handler\n");
677}
678
679static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
680{
681 struct gpio_chip *chip = achip->chip;
682 acpi_handle handle = ACPI_HANDLE(chip->dev);
683 struct acpi_gpio_connection *conn, *tmp;
684 acpi_status status;
685
686 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
687 acpi_gpio_adr_space_handler);
688 if (ACPI_FAILURE(status)) {
689 dev_err(chip->dev, "Failed to remove GPIO OpRegion handler\n");
690 return;
691 }
692
693 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
694 gpiochip_free_own_desc(conn->desc);
695 list_del(&conn->node);
696 kfree(conn);
697 }
698}
699
664e3e5a
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700void acpi_gpiochip_add(struct gpio_chip *chip)
701{
aa92b6f6
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702 struct acpi_gpio_chip *acpi_gpio;
703 acpi_handle handle;
704 acpi_status status;
705
e9595f84
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706 if (!chip || !chip->dev)
707 return;
708
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709 handle = ACPI_HANDLE(chip->dev);
710 if (!handle)
711 return;
712
713 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
714 if (!acpi_gpio) {
715 dev_err(chip->dev,
716 "Failed to allocate memory for ACPI GPIO chip\n");
717 return;
718 }
719
720 acpi_gpio->chip = chip;
721
722 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
723 if (ACPI_FAILURE(status)) {
724 dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n");
725 kfree(acpi_gpio);
726 return;
727 }
728
473ed7be 729 acpi_gpiochip_request_regions(acpi_gpio);
664e3e5a
MW
730}
731
732void acpi_gpiochip_remove(struct gpio_chip *chip)
733{
aa92b6f6
MW
734 struct acpi_gpio_chip *acpi_gpio;
735 acpi_handle handle;
736 acpi_status status;
737
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738 if (!chip || !chip->dev)
739 return;
740
aa92b6f6
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741 handle = ACPI_HANDLE(chip->dev);
742 if (!handle)
743 return;
744
745 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
746 if (ACPI_FAILURE(status)) {
747 dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n");
748 return;
749 }
750
473ed7be 751 acpi_gpiochip_free_regions(acpi_gpio);
aa92b6f6
MW
752
753 acpi_detach_data(handle, acpi_gpio_chip_dh);
754 kfree(acpi_gpio);
664e3e5a 755}
66858527
RI
756
757static unsigned int acpi_gpio_package_count(const union acpi_object *obj)
758{
759 const union acpi_object *element = obj->package.elements;
760 const union acpi_object *end = element + obj->package.count;
761 unsigned int count = 0;
762
763 while (element < end) {
764 if (element->type == ACPI_TYPE_LOCAL_REFERENCE)
765 count++;
766
767 element++;
768 }
769 return count;
770}
771
772static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
773{
774 unsigned int *count = data;
775
776 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
777 *count += ares->data.gpio.pin_table_length;
778
779 return 1;
780}
781
782/**
783 * acpi_gpio_count - return the number of GPIOs associated with a
784 * device / function or -ENOENT if no GPIO has been
785 * assigned to the requested function.
786 * @dev: GPIO consumer, can be NULL for system-global GPIOs
787 * @con_id: function within the GPIO consumer
788 */
789int acpi_gpio_count(struct device *dev, const char *con_id)
790{
791 struct acpi_device *adev = ACPI_COMPANION(dev);
792 const union acpi_object *obj;
793 const struct acpi_gpio_mapping *gm;
794 int count = -ENOENT;
795 int ret;
796 char propname[32];
797 unsigned int i;
798
799 /* Try first from _DSD */
800 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
801 if (con_id && strcmp(con_id, "gpios"))
802 snprintf(propname, sizeof(propname), "%s-%s",
803 con_id, gpio_suffixes[i]);
804 else
805 snprintf(propname, sizeof(propname), "%s",
806 gpio_suffixes[i]);
807
808 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
809 &obj);
810 if (ret == 0) {
811 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
812 count = 1;
813 else if (obj->type == ACPI_TYPE_PACKAGE)
814 count = acpi_gpio_package_count(obj);
815 } else if (adev->driver_gpios) {
816 for (gm = adev->driver_gpios; gm->name; gm++)
817 if (strcmp(propname, gm->name) == 0) {
818 count = gm->size;
819 break;
820 }
821 }
822 if (count >= 0)
823 break;
824 }
825
826 /* Then from plain _CRS GPIOs */
827 if (count < 0) {
828 struct list_head resource_list;
829 unsigned int crs_count = 0;
830
831 INIT_LIST_HEAD(&resource_list);
832 acpi_dev_get_resources(adev, &resource_list,
833 acpi_find_gpio_count, &crs_count);
834 acpi_dev_free_resource_list(&resource_list);
835 if (crs_count > 0)
836 count = crs_count;
837 }
838 return count;
839}