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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>
14 #include <linux/gpio.h>
15 #include <linux/gpio/consumer.h>
16 #include <linux/gpio/driver.h>
17 #include <linux/export.h>
18 #include <linux/acpi.h>
19 #include <linux/interrupt.h>
20 #include <linux/mutex.h>
21 #include <linux/pinctrl/pinctrl.h>
22
23 #include "gpiolib.h"
24
25 struct acpi_gpio_event {
26 struct list_head node;
27 acpi_handle handle;
28 unsigned int pin;
29 unsigned int irq;
30 struct gpio_desc *desc;
31 };
32
33 struct acpi_gpio_connection {
34 struct list_head node;
35 unsigned int pin;
36 struct gpio_desc *desc;
37 };
38
39 struct acpi_gpio_chip {
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;
48 struct gpio_chip *chip;
49 struct list_head events;
50 };
51
52 static 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
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 */
74 static 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
105 static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_chip *chip,
106 int pin)
107 {
108 return pin;
109 }
110 #endif
111
112 /**
113 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
114 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
115 * @pin: ACPI GPIO pin number (0-based, controller-relative)
116 *
117 * Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
118 * error value
119 */
120
121 static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
122 {
123 struct gpio_chip *chip;
124 acpi_handle handle;
125 acpi_status status;
126 int offset;
127
128 status = acpi_get_handle(NULL, path, &handle);
129 if (ACPI_FAILURE(status))
130 return ERR_PTR(-ENODEV);
131
132 chip = gpiochip_find(handle, acpi_gpiochip_find);
133 if (!chip)
134 return ERR_PTR(-ENODEV);
135
136 offset = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
137 if (offset < 0)
138 return ERR_PTR(offset);
139
140 return gpiochip_get_desc(chip, offset);
141 }
142
143 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
144 {
145 struct acpi_gpio_event *event = data;
146
147 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
148
149 return IRQ_HANDLED;
150 }
151
152 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
153 {
154 struct acpi_gpio_event *event = data;
155
156 acpi_execute_simple_method(event->handle, NULL, event->pin);
157
158 return IRQ_HANDLED;
159 }
160
161 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
162 {
163 /* The address of this function is used as a key. */
164 }
165
166 static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
167 void *context)
168 {
169 struct acpi_gpio_chip *acpi_gpio = context;
170 struct gpio_chip *chip = acpi_gpio->chip;
171 struct acpi_resource_gpio *agpio;
172 acpi_handle handle, evt_handle;
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;
178
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;
185
186 handle = ACPI_HANDLE(chip->dev);
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;
203
204 pin = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
205 if (pin < 0)
206 return AE_BAD_PARAMETER;
207
208 desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
209 if (IS_ERR(desc)) {
210 dev_err(chip->dev, "Failed to request GPIO\n");
211 return AE_ERROR;
212 }
213
214 gpiod_direction_input(desc);
215
216 ret = gpiochip_lock_as_irq(chip, pin);
217 if (ret) {
218 dev_err(chip->dev, "Failed to lock GPIO as interrupt\n");
219 goto fail_free_desc;
220 }
221
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 }
227
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;
246 }
247 }
248
249 event = kzalloc(sizeof(*event), GFP_KERNEL);
250 if (!event)
251 goto fail_unlock_irq;
252
253 event->handle = evt_handle;
254 event->irq = irq;
255 event->pin = pin;
256 event->desc = desc;
257
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;
264 }
265
266 list_add_tail(&event->node, &acpi_gpio->events);
267 return AE_OK;
268
269 fail_free_event:
270 kfree(event);
271 fail_unlock_irq:
272 gpiochip_unlock_as_irq(chip, pin);
273 fail_free_desc:
274 gpiochip_free_own_desc(desc);
275
276 return AE_ERROR;
277 }
278
279 /**
280 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
281 * @chip: GPIO chip
282 *
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 */
289 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
290 {
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;
297
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))
304 return;
305
306 INIT_LIST_HEAD(&acpi_gpio->events);
307 acpi_walk_resources(ACPI_HANDLE(chip->dev), "_AEI",
308 acpi_gpiochip_request_interrupt, acpi_gpio);
309 }
310
311 /**
312 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
313 * @chip: GPIO chip
314 *
315 * Free interrupts associated with GPIO ACPI event method for the given
316 * GPIO chip.
317 */
318 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
319 {
320 struct acpi_gpio_chip *acpi_gpio;
321 struct acpi_gpio_event *event, *ep;
322 acpi_handle handle;
323 acpi_status status;
324
325 if (!chip->dev || !chip->to_irq)
326 return;
327
328 handle = ACPI_HANDLE(chip->dev);
329 if (!handle)
330 return;
331
332 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
333 if (ACPI_FAILURE(status))
334 return;
335
336 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
337 struct gpio_desc *desc;
338
339 free_irq(event->irq, event);
340 desc = event->desc;
341 if (WARN_ON(IS_ERR(desc)))
342 continue;
343 gpiochip_unlock_as_irq(chip, event->pin);
344 gpiochip_free_own_desc(desc);
345 list_del(&event->node);
346 kfree(event);
347 }
348 }
349
350 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
351 const struct acpi_gpio_mapping *gpios)
352 {
353 if (adev && gpios) {
354 adev->driver_gpios = gpios;
355 return 0;
356 }
357 return -EINVAL;
358 }
359 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
360
361 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
362 const char *name, int index,
363 struct acpi_reference_args *args)
364 {
365 const struct acpi_gpio_mapping *gm;
366
367 if (!adev->driver_gpios)
368 return false;
369
370 for (gm = adev->driver_gpios; gm->name; gm++)
371 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
372 const struct acpi_gpio_params *par = gm->data + index;
373
374 args->adev = adev;
375 args->args[0] = par->crs_entry_index;
376 args->args[1] = par->line_index;
377 args->args[2] = par->active_low;
378 args->nargs = 3;
379 return true;
380 }
381
382 return false;
383 }
384
385 struct acpi_gpio_lookup {
386 struct acpi_gpio_info info;
387 int index;
388 int pin_index;
389 struct gpio_desc *desc;
390 int n;
391 };
392
393 static int acpi_find_gpio(struct acpi_resource *ares, void *data)
394 {
395 struct acpi_gpio_lookup *lookup = data;
396
397 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
398 return 1;
399
400 if (lookup->n++ == lookup->index && !lookup->desc) {
401 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
402 int pin_index = lookup->pin_index;
403
404 if (pin_index >= agpio->pin_table_length)
405 return 1;
406
407 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
408 agpio->pin_table[pin_index]);
409 lookup->info.gpioint =
410 agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
411
412 /*
413 * ActiveLow is only specified for GpioInt resource. If
414 * GpioIo is used then the only way to set the flag is
415 * to use _DSD "gpios" property.
416 */
417 if (lookup->info.gpioint)
418 lookup->info.active_low =
419 agpio->polarity == ACPI_ACTIVE_LOW;
420 }
421
422 return 1;
423 }
424
425 /**
426 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
427 * @adev: pointer to a ACPI device to get GPIO from
428 * @propname: Property name of the GPIO (optional)
429 * @index: index of GpioIo/GpioInt resource (starting from %0)
430 * @info: info pointer to fill in (optional)
431 *
432 * Function goes through ACPI resources for @adev and based on @index looks
433 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
434 * and returns it. @index matches GpioIo/GpioInt resources only so if there
435 * are total %3 GPIO resources, the index goes from %0 to %2.
436 *
437 * If @propname is specified the GPIO is looked using device property. In
438 * that case @index is used to select the GPIO entry in the property value
439 * (in case of multiple).
440 *
441 * If the GPIO cannot be translated or there is an error an ERR_PTR is
442 * returned.
443 *
444 * Note: if the GPIO resource has multiple entries in the pin list, this
445 * function only returns the first.
446 */
447 struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
448 const char *propname, int index,
449 struct acpi_gpio_info *info)
450 {
451 struct acpi_gpio_lookup lookup;
452 struct list_head resource_list;
453 bool active_low = false;
454 int ret;
455
456 if (!adev)
457 return ERR_PTR(-ENODEV);
458
459 memset(&lookup, 0, sizeof(lookup));
460 lookup.index = index;
461
462 if (propname) {
463 struct acpi_reference_args args;
464
465 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
466
467 memset(&args, 0, sizeof(args));
468 ret = acpi_dev_get_property_reference(adev, propname,
469 index, &args);
470 if (ret) {
471 bool found = acpi_get_driver_gpio_data(adev, propname,
472 index, &args);
473 if (!found)
474 return ERR_PTR(ret);
475 }
476
477 /*
478 * The property was found and resolved so need to
479 * lookup the GPIO based on returned args instead.
480 */
481 adev = args.adev;
482 if (args.nargs >= 2) {
483 lookup.index = args.args[0];
484 lookup.pin_index = args.args[1];
485 /*
486 * 3rd argument, if present is used to
487 * specify active_low.
488 */
489 if (args.nargs >= 3)
490 active_low = !!args.args[2];
491 }
492
493 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %zd %llu %llu %llu\n",
494 dev_name(&adev->dev), args.nargs,
495 args.args[0], args.args[1], args.args[2]);
496 } else {
497 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
498 }
499
500 INIT_LIST_HEAD(&resource_list);
501 ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio,
502 &lookup);
503 if (ret < 0)
504 return ERR_PTR(ret);
505
506 acpi_dev_free_resource_list(&resource_list);
507
508 if (lookup.desc && info) {
509 *info = lookup.info;
510 if (active_low)
511 info->active_low = active_low;
512 }
513
514 return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
515 }
516
517 static acpi_status
518 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
519 u32 bits, u64 *value, void *handler_context,
520 void *region_context)
521 {
522 struct acpi_gpio_chip *achip = region_context;
523 struct gpio_chip *chip = achip->chip;
524 struct acpi_resource_gpio *agpio;
525 struct acpi_resource *ares;
526 int pin_index = (int)address;
527 acpi_status status;
528 bool pull_up;
529 int length;
530 int i;
531
532 status = acpi_buffer_to_resource(achip->conn_info.connection,
533 achip->conn_info.length, &ares);
534 if (ACPI_FAILURE(status))
535 return status;
536
537 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
538 ACPI_FREE(ares);
539 return AE_BAD_PARAMETER;
540 }
541
542 agpio = &ares->data.gpio;
543 pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
544
545 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
546 function == ACPI_WRITE)) {
547 ACPI_FREE(ares);
548 return AE_BAD_PARAMETER;
549 }
550
551 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
552 for (i = pin_index; i < length; ++i) {
553 unsigned pin = agpio->pin_table[i];
554 struct acpi_gpio_connection *conn;
555 struct gpio_desc *desc;
556 bool found;
557
558 pin = acpi_gpiochip_pin_to_gpio_offset(chip, pin);
559 if (pin < 0) {
560 status = AE_BAD_PARAMETER;
561 goto out;
562 }
563
564 mutex_lock(&achip->conn_lock);
565
566 found = false;
567 list_for_each_entry(conn, &achip->conns, node) {
568 if (conn->pin == pin) {
569 found = true;
570 desc = conn->desc;
571 break;
572 }
573 }
574 if (!found) {
575 desc = gpiochip_request_own_desc(chip, pin,
576 "ACPI:OpRegion");
577 if (IS_ERR(desc)) {
578 status = AE_ERROR;
579 mutex_unlock(&achip->conn_lock);
580 goto out;
581 }
582
583 switch (agpio->io_restriction) {
584 case ACPI_IO_RESTRICT_INPUT:
585 gpiod_direction_input(desc);
586 break;
587 case ACPI_IO_RESTRICT_OUTPUT:
588 /*
589 * ACPI GPIO resources don't contain an
590 * initial value for the GPIO. Therefore we
591 * deduce that value from the pull field
592 * instead. If the pin is pulled up we
593 * assume default to be high, otherwise
594 * low.
595 */
596 gpiod_direction_output(desc, pull_up);
597 break;
598 default:
599 /*
600 * Assume that the BIOS has configured the
601 * direction and pull accordingly.
602 */
603 break;
604 }
605
606 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
607 if (!conn) {
608 status = AE_NO_MEMORY;
609 gpiochip_free_own_desc(desc);
610 mutex_unlock(&achip->conn_lock);
611 goto out;
612 }
613
614 conn->pin = pin;
615 conn->desc = desc;
616 list_add_tail(&conn->node, &achip->conns);
617 }
618
619 mutex_unlock(&achip->conn_lock);
620
621 if (function == ACPI_WRITE)
622 gpiod_set_raw_value_cansleep(desc,
623 !!((1 << i) & *value));
624 else
625 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
626 }
627
628 out:
629 ACPI_FREE(ares);
630 return status;
631 }
632
633 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
634 {
635 struct gpio_chip *chip = achip->chip;
636 acpi_handle handle = ACPI_HANDLE(chip->dev);
637 acpi_status status;
638
639 INIT_LIST_HEAD(&achip->conns);
640 mutex_init(&achip->conn_lock);
641 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
642 acpi_gpio_adr_space_handler,
643 NULL, achip);
644 if (ACPI_FAILURE(status))
645 dev_err(chip->dev, "Failed to install GPIO OpRegion handler\n");
646 }
647
648 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
649 {
650 struct gpio_chip *chip = achip->chip;
651 acpi_handle handle = ACPI_HANDLE(chip->dev);
652 struct acpi_gpio_connection *conn, *tmp;
653 acpi_status status;
654
655 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
656 acpi_gpio_adr_space_handler);
657 if (ACPI_FAILURE(status)) {
658 dev_err(chip->dev, "Failed to remove GPIO OpRegion handler\n");
659 return;
660 }
661
662 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
663 gpiochip_free_own_desc(conn->desc);
664 list_del(&conn->node);
665 kfree(conn);
666 }
667 }
668
669 void acpi_gpiochip_add(struct gpio_chip *chip)
670 {
671 struct acpi_gpio_chip *acpi_gpio;
672 acpi_handle handle;
673 acpi_status status;
674
675 if (!chip || !chip->dev)
676 return;
677
678 handle = ACPI_HANDLE(chip->dev);
679 if (!handle)
680 return;
681
682 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
683 if (!acpi_gpio) {
684 dev_err(chip->dev,
685 "Failed to allocate memory for ACPI GPIO chip\n");
686 return;
687 }
688
689 acpi_gpio->chip = chip;
690
691 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
692 if (ACPI_FAILURE(status)) {
693 dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n");
694 kfree(acpi_gpio);
695 return;
696 }
697
698 acpi_gpiochip_request_regions(acpi_gpio);
699 }
700
701 void acpi_gpiochip_remove(struct gpio_chip *chip)
702 {
703 struct acpi_gpio_chip *acpi_gpio;
704 acpi_handle handle;
705 acpi_status status;
706
707 if (!chip || !chip->dev)
708 return;
709
710 handle = ACPI_HANDLE(chip->dev);
711 if (!handle)
712 return;
713
714 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
715 if (ACPI_FAILURE(status)) {
716 dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n");
717 return;
718 }
719
720 acpi_gpiochip_free_regions(acpi_gpio);
721
722 acpi_detach_data(handle, acpi_gpio_chip_dh);
723 kfree(acpi_gpio);
724 }