Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * ACPI helpers for GPIO API
4 *
5 * Copyright (C) 2012, Intel Corporation
6 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
7 * Mika Westerberg <mika.westerberg@linux.intel.com>
8 */
9
10#include <linux/acpi.h>
11#include <linux/dmi.h>
12#include <linux/errno.h>
13#include <linux/export.h>
14#include <linux/interrupt.h>
15#include <linux/irq.h>
16#include <linux/mutex.h>
17#include <linux/pinctrl/pinctrl.h>
18
19#include <linux/gpio/consumer.h>
20#include <linux/gpio/driver.h>
21#include <linux/gpio/machine.h>
22
23#include "gpiolib.h"
24#include "gpiolib-acpi.h"
25
26static int run_edge_events_on_boot = -1;
27module_param(run_edge_events_on_boot, int, 0444);
28MODULE_PARM_DESC(run_edge_events_on_boot,
29 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");
30
31static char *ignore_wake;
32module_param(ignore_wake, charp, 0444);
33MODULE_PARM_DESC(ignore_wake,
34 "controller@pin combos on which to ignore the ACPI wake flag "
35 "ignore_wake=controller@pin[,controller@pin[,...]]");
36
37static char *ignore_interrupt;
38module_param(ignore_interrupt, charp, 0444);
39MODULE_PARM_DESC(ignore_interrupt,
40 "controller@pin combos on which to ignore interrupt "
41 "ignore_interrupt=controller@pin[,controller@pin[,...]]");
42
43struct acpi_gpiolib_dmi_quirk {
44 bool no_edge_events_on_boot;
45 char *ignore_wake;
46 char *ignore_interrupt;
47};
48
49/**
50 * struct acpi_gpio_event - ACPI GPIO event handler data
51 *
52 * @node: list-entry of the events list of the struct acpi_gpio_chip
53 * @handle: handle of ACPI method to execute when the IRQ triggers
54 * @handler: handler function to pass to request_irq() when requesting the IRQ
55 * @pin: GPIO pin number on the struct gpio_chip
56 * @irq: Linux IRQ number for the event, for request_irq() / free_irq()
57 * @irqflags: flags to pass to request_irq() when requesting the IRQ
58 * @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
59 * @irq_requested:True if request_irq() has been done
60 * @desc: struct gpio_desc for the GPIO pin for this event
61 */
62struct acpi_gpio_event {
63 struct list_head node;
64 acpi_handle handle;
65 irq_handler_t handler;
66 unsigned int pin;
67 unsigned int irq;
68 unsigned long irqflags;
69 bool irq_is_wake;
70 bool irq_requested;
71 struct gpio_desc *desc;
72};
73
74struct acpi_gpio_connection {
75 struct list_head node;
76 unsigned int pin;
77 struct gpio_desc *desc;
78};
79
80struct acpi_gpio_chip {
81 /*
82 * ACPICA requires that the first field of the context parameter
83 * passed to acpi_install_address_space_handler() is large enough
84 * to hold struct acpi_connection_info.
85 */
86 struct acpi_connection_info conn_info;
87 struct list_head conns;
88 struct mutex conn_lock;
89 struct gpio_chip *chip;
90 struct list_head events;
91 struct list_head deferred_req_irqs_list_entry;
92};
93
94/**
95 * struct acpi_gpio_info - ACPI GPIO specific information
96 * @adev: reference to ACPI device which consumes GPIO resource
97 * @flags: GPIO initialization flags
98 * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
99 * @pin_config: pin bias as provided by ACPI
100 * @polarity: interrupt polarity as provided by ACPI
101 * @triggering: triggering type as provided by ACPI
102 * @wake_capable: wake capability as provided by ACPI
103 * @debounce: debounce timeout as provided by ACPI
104 * @quirks: Linux specific quirks as provided by struct acpi_gpio_mapping
105 */
106struct acpi_gpio_info {
107 struct acpi_device *adev;
108 enum gpiod_flags flags;
109 bool gpioint;
110 int pin_config;
111 int polarity;
112 int triggering;
113 bool wake_capable;
114 unsigned int debounce;
115 unsigned int quirks;
116};
117
118/*
119 * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
120 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
121 * late_initcall_sync() handler, so that other builtin drivers can register their
122 * OpRegions before the event handlers can run. This list contains GPIO chips
123 * for which the acpi_gpiochip_request_irqs() call has been deferred.
124 */
125static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
126static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
127static bool acpi_gpio_deferred_req_irqs_done;
128
129static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
130{
131 return device_match_acpi_handle(&gc->gpiodev->dev, data);
132}
133
134/**
135 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
136 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
137 * @pin: ACPI GPIO pin number (0-based, controller-relative)
138 *
139 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
140 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
141 * controller does not have GPIO chip registered at the moment. This is to
142 * support probe deferral.
143 */
144static struct gpio_desc *acpi_get_gpiod(char *path, unsigned int pin)
145{
146 acpi_handle handle;
147 acpi_status status;
148
149 status = acpi_get_handle(NULL, path, &handle);
150 if (ACPI_FAILURE(status))
151 return ERR_PTR(-ENODEV);
152
153 struct gpio_device *gdev __free(gpio_device_put) =
154 gpio_device_find(handle, acpi_gpiochip_find);
155 if (!gdev)
156 return ERR_PTR(-EPROBE_DEFER);
157
158 /*
159 * FIXME: keep track of the reference to the GPIO device somehow
160 * instead of putting it here.
161 */
162 return gpio_device_get_desc(gdev, pin);
163}
164
165static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
166{
167 struct acpi_gpio_event *event = data;
168
169 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
170
171 return IRQ_HANDLED;
172}
173
174static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
175{
176 struct acpi_gpio_event *event = data;
177
178 acpi_execute_simple_method(event->handle, NULL, event->pin);
179
180 return IRQ_HANDLED;
181}
182
183static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
184{
185 /* The address of this function is used as a key. */
186}
187
188bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
189 struct acpi_resource_gpio **agpio)
190{
191 struct acpi_resource_gpio *gpio;
192
193 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
194 return false;
195
196 gpio = &ares->data.gpio;
197 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
198 return false;
199
200 *agpio = gpio;
201 return true;
202}
203EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
204
205/**
206 * acpi_gpio_get_io_resource - Fetch details of an ACPI resource if it is a GPIO
207 * I/O resource or return False if not.
208 * @ares: Pointer to the ACPI resource to fetch
209 * @agpio: Pointer to a &struct acpi_resource_gpio to store the output pointer
210 */
211bool acpi_gpio_get_io_resource(struct acpi_resource *ares,
212 struct acpi_resource_gpio **agpio)
213{
214 struct acpi_resource_gpio *gpio;
215
216 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
217 return false;
218
219 gpio = &ares->data.gpio;
220 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_IO)
221 return false;
222
223 *agpio = gpio;
224 return true;
225}
226EXPORT_SYMBOL_GPL(acpi_gpio_get_io_resource);
227
228static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
229 struct acpi_gpio_event *event)
230{
231 struct device *parent = acpi_gpio->chip->parent;
232 int ret, value;
233
234 ret = request_threaded_irq(event->irq, NULL, event->handler,
235 event->irqflags | IRQF_ONESHOT, "ACPI:Event", event);
236 if (ret) {
237 dev_err(parent, "Failed to setup interrupt handler for %d\n", event->irq);
238 return;
239 }
240
241 if (event->irq_is_wake)
242 enable_irq_wake(event->irq);
243
244 event->irq_requested = true;
245
246 /* Make sure we trigger the initial state of edge-triggered IRQs */
247 if (run_edge_events_on_boot &&
248 (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
249 value = gpiod_get_raw_value_cansleep(event->desc);
250 if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
251 ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
252 event->handler(event->irq, event);
253 }
254}
255
256static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
257{
258 struct acpi_gpio_event *event;
259
260 list_for_each_entry(event, &acpi_gpio->events, node)
261 acpi_gpiochip_request_irq(acpi_gpio, event);
262}
263
264static enum gpiod_flags
265acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio, int polarity)
266{
267 /* GpioInt() implies input configuration */
268 if (agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT)
269 return GPIOD_IN;
270
271 switch (agpio->io_restriction) {
272 case ACPI_IO_RESTRICT_INPUT:
273 return GPIOD_IN;
274 case ACPI_IO_RESTRICT_OUTPUT:
275 /*
276 * ACPI GPIO resources don't contain an initial value for the
277 * GPIO. Therefore we deduce that value from the pull field
278 * and the polarity instead. If the pin is pulled up we assume
279 * default to be high, if it is pulled down we assume default
280 * to be low, otherwise we leave pin untouched. For active low
281 * polarity values will be switched. See also
282 * Documentation/firmware-guide/acpi/gpio-properties.rst.
283 */
284 switch (agpio->pin_config) {
285 case ACPI_PIN_CONFIG_PULLUP:
286 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
287 case ACPI_PIN_CONFIG_PULLDOWN:
288 return polarity == GPIO_ACTIVE_LOW ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
289 default:
290 break;
291 }
292 break;
293 default:
294 break;
295 }
296
297 /*
298 * Assume that the BIOS has configured the direction and pull
299 * accordingly.
300 */
301 return GPIOD_ASIS;
302}
303
304static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
305 struct acpi_resource_gpio *agpio,
306 unsigned int index,
307 const char *label)
308{
309 int polarity = GPIO_ACTIVE_HIGH;
310 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio, polarity);
311 unsigned int pin = agpio->pin_table[index];
312 struct gpio_desc *desc;
313 int ret;
314
315 desc = gpiochip_request_own_desc(chip, pin, label, polarity, flags);
316 if (IS_ERR(desc))
317 return desc;
318
319 /* ACPI uses hundredths of milliseconds units */
320 ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
321 if (ret)
322 dev_warn(chip->parent,
323 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
324 pin, ret);
325
326 return desc;
327}
328
329static bool acpi_gpio_in_ignore_list(const char *ignore_list, const char *controller_in,
330 unsigned int pin_in)
331{
332 const char *controller, *pin_str;
333 unsigned int pin;
334 char *endp;
335 int len;
336
337 controller = ignore_list;
338 while (controller) {
339 pin_str = strchr(controller, '@');
340 if (!pin_str)
341 goto err;
342
343 len = pin_str - controller;
344 if (len == strlen(controller_in) &&
345 strncmp(controller, controller_in, len) == 0) {
346 pin = simple_strtoul(pin_str + 1, &endp, 10);
347 if (*endp != 0 && *endp != ',')
348 goto err;
349
350 if (pin == pin_in)
351 return true;
352 }
353
354 controller = strchr(controller, ',');
355 if (controller)
356 controller++;
357 }
358
359 return false;
360err:
361 pr_err_once("Error: Invalid value for gpiolib_acpi.ignore_...: %s\n", ignore_list);
362 return false;
363}
364
365static bool acpi_gpio_irq_is_wake(struct device *parent,
366 const struct acpi_resource_gpio *agpio)
367{
368 unsigned int pin = agpio->pin_table[0];
369
370 if (agpio->wake_capable != ACPI_WAKE_CAPABLE)
371 return false;
372
373 if (acpi_gpio_in_ignore_list(ignore_wake, dev_name(parent), pin)) {
374 dev_info(parent, "Ignoring wakeup on pin %u\n", pin);
375 return false;
376 }
377
378 return true;
379}
380
381/* Always returns AE_OK so that we keep looping over the resources */
382static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
383 void *context)
384{
385 struct acpi_gpio_chip *acpi_gpio = context;
386 struct gpio_chip *chip = acpi_gpio->chip;
387 struct acpi_resource_gpio *agpio;
388 acpi_handle handle, evt_handle;
389 struct acpi_gpio_event *event;
390 irq_handler_t handler = NULL;
391 struct gpio_desc *desc;
392 unsigned int pin;
393 int ret, irq;
394
395 if (!acpi_gpio_get_irq_resource(ares, &agpio))
396 return AE_OK;
397
398 handle = ACPI_HANDLE(chip->parent);
399 pin = agpio->pin_table[0];
400
401 if (pin <= 255) {
402 char ev_name[8];
403 sprintf(ev_name, "_%c%02X",
404 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
405 pin);
406 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
407 handler = acpi_gpio_irq_handler;
408 }
409 if (!handler) {
410 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
411 handler = acpi_gpio_irq_handler_evt;
412 }
413 if (!handler)
414 return AE_OK;
415
416 if (acpi_gpio_in_ignore_list(ignore_interrupt, dev_name(chip->parent), pin)) {
417 dev_info(chip->parent, "Ignoring interrupt on pin %u\n", pin);
418 return AE_OK;
419 }
420
421 desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
422 if (IS_ERR(desc)) {
423 dev_err(chip->parent,
424 "Failed to request GPIO for pin 0x%04X, err %ld\n",
425 pin, PTR_ERR(desc));
426 return AE_OK;
427 }
428
429 ret = gpiochip_lock_as_irq(chip, pin);
430 if (ret) {
431 dev_err(chip->parent,
432 "Failed to lock GPIO pin 0x%04X as interrupt, err %d\n",
433 pin, ret);
434 goto fail_free_desc;
435 }
436
437 irq = gpiod_to_irq(desc);
438 if (irq < 0) {
439 dev_err(chip->parent,
440 "Failed to translate GPIO pin 0x%04X to IRQ, err %d\n",
441 pin, irq);
442 goto fail_unlock_irq;
443 }
444
445 event = kzalloc(sizeof(*event), GFP_KERNEL);
446 if (!event)
447 goto fail_unlock_irq;
448
449 event->irqflags = IRQF_ONESHOT;
450 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
451 if (agpio->polarity == ACPI_ACTIVE_HIGH)
452 event->irqflags |= IRQF_TRIGGER_HIGH;
453 else
454 event->irqflags |= IRQF_TRIGGER_LOW;
455 } else {
456 switch (agpio->polarity) {
457 case ACPI_ACTIVE_HIGH:
458 event->irqflags |= IRQF_TRIGGER_RISING;
459 break;
460 case ACPI_ACTIVE_LOW:
461 event->irqflags |= IRQF_TRIGGER_FALLING;
462 break;
463 default:
464 event->irqflags |= IRQF_TRIGGER_RISING |
465 IRQF_TRIGGER_FALLING;
466 break;
467 }
468 }
469
470 event->handle = evt_handle;
471 event->handler = handler;
472 event->irq = irq;
473 event->irq_is_wake = acpi_gpio_irq_is_wake(chip->parent, agpio);
474 event->pin = pin;
475 event->desc = desc;
476
477 list_add_tail(&event->node, &acpi_gpio->events);
478
479 return AE_OK;
480
481fail_unlock_irq:
482 gpiochip_unlock_as_irq(chip, pin);
483fail_free_desc:
484 gpiochip_free_own_desc(desc);
485
486 return AE_OK;
487}
488
489/**
490 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
491 * @chip: GPIO chip
492 *
493 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
494 * handled by ACPI event methods which need to be called from the GPIO
495 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
496 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
497 * the ACPI event methods for those pins.
498 */
499void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
500{
501 struct acpi_gpio_chip *acpi_gpio;
502 acpi_handle handle;
503 acpi_status status;
504 bool defer;
505
506 if (!chip->parent || !chip->to_irq)
507 return;
508
509 handle = ACPI_HANDLE(chip->parent);
510 if (!handle)
511 return;
512
513 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
514 if (ACPI_FAILURE(status))
515 return;
516
517 if (acpi_quirk_skip_gpio_event_handlers())
518 return;
519
520 acpi_walk_resources(handle, METHOD_NAME__AEI,
521 acpi_gpiochip_alloc_event, acpi_gpio);
522
523 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
524 defer = !acpi_gpio_deferred_req_irqs_done;
525 if (defer)
526 list_add(&acpi_gpio->deferred_req_irqs_list_entry,
527 &acpi_gpio_deferred_req_irqs_list);
528 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
529
530 if (defer)
531 return;
532
533 acpi_gpiochip_request_irqs(acpi_gpio);
534}
535EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
536
537/**
538 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
539 * @chip: GPIO chip
540 *
541 * Free interrupts associated with GPIO ACPI event method for the given
542 * GPIO chip.
543 */
544void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
545{
546 struct acpi_gpio_chip *acpi_gpio;
547 struct acpi_gpio_event *event, *ep;
548 acpi_handle handle;
549 acpi_status status;
550
551 if (!chip->parent || !chip->to_irq)
552 return;
553
554 handle = ACPI_HANDLE(chip->parent);
555 if (!handle)
556 return;
557
558 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
559 if (ACPI_FAILURE(status))
560 return;
561
562 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
563 if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
564 list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
565 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
566
567 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
568 if (event->irq_requested) {
569 if (event->irq_is_wake)
570 disable_irq_wake(event->irq);
571
572 free_irq(event->irq, event);
573 }
574
575 gpiochip_unlock_as_irq(chip, event->pin);
576 gpiochip_free_own_desc(event->desc);
577 list_del(&event->node);
578 kfree(event);
579 }
580}
581EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
582
583int acpi_dev_add_driver_gpios(struct acpi_device *adev,
584 const struct acpi_gpio_mapping *gpios)
585{
586 if (adev && gpios) {
587 adev->driver_gpios = gpios;
588 return 0;
589 }
590 return -EINVAL;
591}
592EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
593
594void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
595{
596 if (adev)
597 adev->driver_gpios = NULL;
598}
599EXPORT_SYMBOL_GPL(acpi_dev_remove_driver_gpios);
600
601static void acpi_dev_release_driver_gpios(void *adev)
602{
603 acpi_dev_remove_driver_gpios(adev);
604}
605
606int devm_acpi_dev_add_driver_gpios(struct device *dev,
607 const struct acpi_gpio_mapping *gpios)
608{
609 struct acpi_device *adev = ACPI_COMPANION(dev);
610 int ret;
611
612 ret = acpi_dev_add_driver_gpios(adev, gpios);
613 if (ret)
614 return ret;
615
616 return devm_add_action_or_reset(dev, acpi_dev_release_driver_gpios, adev);
617}
618EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
619
620static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
621 const char *name, int index,
622 struct fwnode_reference_args *args,
623 unsigned int *quirks)
624{
625 const struct acpi_gpio_mapping *gm;
626
627 if (!adev || !adev->driver_gpios)
628 return false;
629
630 for (gm = adev->driver_gpios; gm->name; gm++)
631 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
632 const struct acpi_gpio_params *par = gm->data + index;
633
634 args->fwnode = acpi_fwnode_handle(adev);
635 args->args[0] = par->crs_entry_index;
636 args->args[1] = par->line_index;
637 args->args[2] = par->active_low;
638 args->nargs = 3;
639
640 *quirks = gm->quirks;
641 return true;
642 }
643
644 return false;
645}
646
647static int
648__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
649{
650 const enum gpiod_flags mask =
651 GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
652 GPIOD_FLAGS_BIT_DIR_VAL;
653 int ret = 0;
654
655 /*
656 * Check if the BIOS has IoRestriction with explicitly set direction
657 * and update @flags accordingly. Otherwise use whatever caller asked
658 * for.
659 */
660 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
661 enum gpiod_flags diff = *flags ^ update;
662
663 /*
664 * Check if caller supplied incompatible GPIO initialization
665 * flags.
666 *
667 * Return %-EINVAL to notify that firmware has different
668 * settings and we are going to use them.
669 */
670 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
671 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
672 ret = -EINVAL;
673 *flags = (*flags & ~mask) | (update & mask);
674 }
675 return ret;
676}
677
678static int acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags,
679 struct acpi_gpio_info *info)
680{
681 struct device *dev = &info->adev->dev;
682 enum gpiod_flags old = *flags;
683 int ret;
684
685 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
686 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
687 if (ret)
688 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
689 } else {
690 if (ret)
691 dev_dbg(dev, "Override GPIO initialization flags\n");
692 *flags = old;
693 }
694
695 return ret;
696}
697
698static int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
699 struct acpi_gpio_info *info)
700{
701 switch (info->pin_config) {
702 case ACPI_PIN_CONFIG_PULLUP:
703 *lookupflags |= GPIO_PULL_UP;
704 break;
705 case ACPI_PIN_CONFIG_PULLDOWN:
706 *lookupflags |= GPIO_PULL_DOWN;
707 break;
708 case ACPI_PIN_CONFIG_NOPULL:
709 *lookupflags |= GPIO_PULL_DISABLE;
710 break;
711 default:
712 break;
713 }
714
715 if (info->polarity == GPIO_ACTIVE_LOW)
716 *lookupflags |= GPIO_ACTIVE_LOW;
717
718 return 0;
719}
720
721struct acpi_gpio_lookup {
722 struct acpi_gpio_info info;
723 int index;
724 u16 pin_index;
725 bool active_low;
726 struct gpio_desc *desc;
727 int n;
728};
729
730static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
731{
732 struct acpi_gpio_lookup *lookup = data;
733
734 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
735 return 1;
736
737 if (!lookup->desc) {
738 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
739 bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
740 struct gpio_desc *desc;
741 u16 pin_index;
742
743 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
744 lookup->index++;
745
746 if (lookup->n++ != lookup->index)
747 return 1;
748
749 pin_index = lookup->pin_index;
750 if (pin_index >= agpio->pin_table_length)
751 return 1;
752
753 if (lookup->info.quirks & ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER)
754 desc = gpio_to_desc(agpio->pin_table[pin_index]);
755 else
756 desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
757 agpio->pin_table[pin_index]);
758 lookup->desc = desc;
759 lookup->info.pin_config = agpio->pin_config;
760 lookup->info.debounce = agpio->debounce_timeout;
761 lookup->info.gpioint = gpioint;
762 lookup->info.wake_capable = acpi_gpio_irq_is_wake(&lookup->info.adev->dev, agpio);
763
764 /*
765 * Polarity and triggering are only specified for GpioInt
766 * resource.
767 * Note: we expect here:
768 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
769 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
770 */
771 if (lookup->info.gpioint) {
772 lookup->info.polarity = agpio->polarity;
773 lookup->info.triggering = agpio->triggering;
774 } else {
775 lookup->info.polarity = lookup->active_low;
776 }
777
778 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio, lookup->info.polarity);
779 }
780
781 return 1;
782}
783
784static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
785 struct acpi_gpio_info *info)
786{
787 struct acpi_device *adev = lookup->info.adev;
788 struct list_head res_list;
789 int ret;
790
791 INIT_LIST_HEAD(&res_list);
792
793 ret = acpi_dev_get_resources(adev, &res_list,
794 acpi_populate_gpio_lookup,
795 lookup);
796 if (ret < 0)
797 return ret;
798
799 acpi_dev_free_resource_list(&res_list);
800
801 if (!lookup->desc)
802 return -ENOENT;
803
804 if (info)
805 *info = lookup->info;
806 return 0;
807}
808
809static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
810 const char *propname, int index,
811 struct acpi_gpio_lookup *lookup)
812{
813 struct fwnode_reference_args args;
814 unsigned int quirks = 0;
815 int ret;
816
817 memset(&args, 0, sizeof(args));
818 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
819 &args);
820 if (ret) {
821 struct acpi_device *adev;
822
823 adev = to_acpi_device_node(fwnode);
824 if (!acpi_get_driver_gpio_data(adev, propname, index, &args, &quirks))
825 return ret;
826 }
827 /*
828 * The property was found and resolved, so need to lookup the GPIO based
829 * on returned args.
830 */
831 if (!to_acpi_device_node(args.fwnode))
832 return -EINVAL;
833 if (args.nargs != 3)
834 return -EPROTO;
835
836 lookup->index = args.args[0];
837 lookup->pin_index = args.args[1];
838 lookup->active_low = !!args.args[2];
839
840 lookup->info.adev = to_acpi_device_node(args.fwnode);
841 lookup->info.quirks = quirks;
842
843 return 0;
844}
845
846/**
847 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
848 * @adev: pointer to a ACPI device to get GPIO from
849 * @propname: Property name of the GPIO (optional)
850 * @index: index of GpioIo/GpioInt resource (starting from %0)
851 * @info: info pointer to fill in (optional)
852 *
853 * Function goes through ACPI resources for @adev and based on @index looks
854 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
855 * and returns it. @index matches GpioIo/GpioInt resources only so if there
856 * are total %3 GPIO resources, the index goes from %0 to %2.
857 *
858 * If @propname is specified the GPIO is looked using device property. In
859 * that case @index is used to select the GPIO entry in the property value
860 * (in case of multiple).
861 *
862 * If the GPIO cannot be translated or there is an error, an ERR_PTR is
863 * returned.
864 *
865 * Note: if the GPIO resource has multiple entries in the pin list, this
866 * function only returns the first.
867 */
868static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
869 const char *propname,
870 int index,
871 struct acpi_gpio_info *info)
872{
873 struct acpi_gpio_lookup lookup;
874 int ret;
875
876 if (!adev)
877 return ERR_PTR(-ENODEV);
878
879 memset(&lookup, 0, sizeof(lookup));
880 lookup.index = index;
881
882 if (propname) {
883 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
884
885 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
886 propname, index, &lookup);
887 if (ret)
888 return ERR_PTR(ret);
889
890 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %u %u\n",
891 dev_name(&lookup.info.adev->dev), lookup.index,
892 lookup.pin_index, lookup.active_low);
893 } else {
894 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
895 lookup.info.adev = adev;
896 }
897
898 ret = acpi_gpio_resource_lookup(&lookup, info);
899 return ret ? ERR_PTR(ret) : lookup.desc;
900}
901
902/**
903 * acpi_get_gpiod_from_data() - get a GPIO descriptor from ACPI data node
904 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
905 * @propname: Property name of the GPIO
906 * @index: index of GpioIo/GpioInt resource (starting from %0)
907 * @info: info pointer to fill in (optional)
908 *
909 * This function uses the property-based GPIO lookup to get to the GPIO
910 * resource with the relevant information from a data-only ACPI firmware node
911 * and uses that to obtain the GPIO descriptor to return.
912 *
913 * If the GPIO cannot be translated or there is an error an ERR_PTR is
914 * returned.
915 */
916static struct gpio_desc *acpi_get_gpiod_from_data(struct fwnode_handle *fwnode,
917 const char *propname,
918 int index,
919 struct acpi_gpio_info *info)
920{
921 struct acpi_gpio_lookup lookup;
922 int ret;
923
924 if (!is_acpi_data_node(fwnode))
925 return ERR_PTR(-ENODEV);
926
927 if (!propname)
928 return ERR_PTR(-EINVAL);
929
930 memset(&lookup, 0, sizeof(lookup));
931 lookup.index = index;
932
933 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
934 if (ret)
935 return ERR_PTR(ret);
936
937 ret = acpi_gpio_resource_lookup(&lookup, info);
938 return ret ? ERR_PTR(ret) : lookup.desc;
939}
940
941static bool acpi_can_fallback_to_crs(struct acpi_device *adev,
942 const char *con_id)
943{
944 /* Never allow fallback if the device has properties */
945 if (acpi_dev_has_props(adev) || adev->driver_gpios)
946 return false;
947
948 return con_id == NULL;
949}
950
951struct gpio_desc *acpi_find_gpio(struct fwnode_handle *fwnode,
952 const char *con_id,
953 unsigned int idx,
954 enum gpiod_flags *dflags,
955 unsigned long *lookupflags)
956{
957 struct acpi_device *adev = to_acpi_device_node(fwnode);
958 struct acpi_gpio_info info;
959 struct gpio_desc *desc;
960 char propname[32];
961 int i;
962
963 /* Try first from _DSD */
964 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
965 if (con_id) {
966 snprintf(propname, sizeof(propname), "%s-%s",
967 con_id, gpio_suffixes[i]);
968 } else {
969 snprintf(propname, sizeof(propname), "%s",
970 gpio_suffixes[i]);
971 }
972
973 if (adev)
974 desc = acpi_get_gpiod_by_index(adev,
975 propname, idx, &info);
976 else
977 desc = acpi_get_gpiod_from_data(fwnode,
978 propname, idx, &info);
979 if (!IS_ERR(desc))
980 break;
981 if (PTR_ERR(desc) == -EPROBE_DEFER)
982 return ERR_CAST(desc);
983 }
984
985 /* Then from plain _CRS GPIOs */
986 if (IS_ERR(desc)) {
987 if (!adev || !acpi_can_fallback_to_crs(adev, con_id))
988 return ERR_PTR(-ENOENT);
989
990 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
991 if (IS_ERR(desc))
992 return desc;
993 }
994
995 if (info.gpioint &&
996 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
997 dev_dbg(&adev->dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
998 return ERR_PTR(-ENOENT);
999 }
1000
1001 acpi_gpio_update_gpiod_flags(dflags, &info);
1002 acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
1003 return desc;
1004}
1005
1006/**
1007 * acpi_dev_gpio_irq_wake_get_by() - Find GpioInt and translate it to Linux IRQ number
1008 * @adev: pointer to a ACPI device to get IRQ from
1009 * @name: optional name of GpioInt resource
1010 * @index: index of GpioInt resource (starting from %0)
1011 * @wake_capable: Set to true if the IRQ is wake capable
1012 *
1013 * If the device has one or more GpioInt resources, this function can be
1014 * used to translate from the GPIO offset in the resource to the Linux IRQ
1015 * number.
1016 *
1017 * The function is idempotent, though each time it runs it will configure GPIO
1018 * pin direction according to the flags in GpioInt resource.
1019 *
1020 * The function takes optional @name parameter. If the resource has a property
1021 * name, then only those will be taken into account.
1022 *
1023 * The GPIO is considered wake capable if the GpioInt resource specifies
1024 * SharedAndWake or ExclusiveAndWake.
1025 *
1026 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
1027 */
1028int acpi_dev_gpio_irq_wake_get_by(struct acpi_device *adev, const char *name, int index,
1029 bool *wake_capable)
1030{
1031 int idx, i;
1032 unsigned int irq_flags;
1033 int ret;
1034
1035 for (i = 0, idx = 0; idx <= index; i++) {
1036 struct acpi_gpio_info info;
1037 struct gpio_desc *desc;
1038
1039 desc = acpi_get_gpiod_by_index(adev, name, i, &info);
1040
1041 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
1042 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
1043 return PTR_ERR(desc);
1044
1045 if (info.gpioint && idx++ == index) {
1046 unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1047 enum gpiod_flags dflags = GPIOD_ASIS;
1048 char label[32];
1049 int irq;
1050
1051 if (IS_ERR(desc))
1052 return PTR_ERR(desc);
1053
1054 irq = gpiod_to_irq(desc);
1055 if (irq < 0)
1056 return irq;
1057
1058 acpi_gpio_update_gpiod_flags(&dflags, &info);
1059 acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
1060
1061 snprintf(label, sizeof(label), "GpioInt() %d", index);
1062 ret = gpiod_configure_flags(desc, label, lflags, dflags);
1063 if (ret < 0)
1064 return ret;
1065
1066 /* ACPI uses hundredths of milliseconds units */
1067 ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
1068 if (ret)
1069 return ret;
1070
1071 irq_flags = acpi_dev_get_irq_type(info.triggering,
1072 info.polarity);
1073
1074 /*
1075 * If the IRQ is not already in use then set type
1076 * if specified and different than the current one.
1077 */
1078 if (can_request_irq(irq, irq_flags)) {
1079 if (irq_flags != IRQ_TYPE_NONE &&
1080 irq_flags != irq_get_trigger_type(irq))
1081 irq_set_irq_type(irq, irq_flags);
1082 } else {
1083 dev_dbg(&adev->dev, "IRQ %d already in use\n", irq);
1084 }
1085
1086 /* avoid suspend issues with GPIOs when systems are using S3 */
1087 if (wake_capable && acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
1088 *wake_capable = info.wake_capable;
1089
1090 return irq;
1091 }
1092
1093 }
1094 return -ENOENT;
1095}
1096EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_wake_get_by);
1097
1098static acpi_status
1099acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
1100 u32 bits, u64 *value, void *handler_context,
1101 void *region_context)
1102{
1103 struct acpi_gpio_chip *achip = region_context;
1104 struct gpio_chip *chip = achip->chip;
1105 struct acpi_resource_gpio *agpio;
1106 struct acpi_resource *ares;
1107 u16 pin_index = address;
1108 acpi_status status;
1109 int length;
1110 int i;
1111
1112 status = acpi_buffer_to_resource(achip->conn_info.connection,
1113 achip->conn_info.length, &ares);
1114 if (ACPI_FAILURE(status))
1115 return status;
1116
1117 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
1118 ACPI_FREE(ares);
1119 return AE_BAD_PARAMETER;
1120 }
1121
1122 agpio = &ares->data.gpio;
1123
1124 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
1125 function == ACPI_WRITE)) {
1126 ACPI_FREE(ares);
1127 return AE_BAD_PARAMETER;
1128 }
1129
1130 length = min_t(u16, agpio->pin_table_length, pin_index + bits);
1131 for (i = pin_index; i < length; ++i) {
1132 unsigned int pin = agpio->pin_table[i];
1133 struct acpi_gpio_connection *conn;
1134 struct gpio_desc *desc;
1135 bool found;
1136
1137 mutex_lock(&achip->conn_lock);
1138
1139 found = false;
1140 list_for_each_entry(conn, &achip->conns, node) {
1141 if (conn->pin == pin) {
1142 found = true;
1143 desc = conn->desc;
1144 break;
1145 }
1146 }
1147
1148 /*
1149 * The same GPIO can be shared between operation region and
1150 * event but only if the access here is ACPI_READ. In that
1151 * case we "borrow" the event GPIO instead.
1152 */
1153 if (!found && agpio->shareable == ACPI_SHARED &&
1154 function == ACPI_READ) {
1155 struct acpi_gpio_event *event;
1156
1157 list_for_each_entry(event, &achip->events, node) {
1158 if (event->pin == pin) {
1159 desc = event->desc;
1160 found = true;
1161 break;
1162 }
1163 }
1164 }
1165
1166 if (!found) {
1167 desc = acpi_request_own_gpiod(chip, agpio, i, "ACPI:OpRegion");
1168 if (IS_ERR(desc)) {
1169 mutex_unlock(&achip->conn_lock);
1170 status = AE_ERROR;
1171 goto out;
1172 }
1173
1174 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
1175 if (!conn) {
1176 gpiochip_free_own_desc(desc);
1177 mutex_unlock(&achip->conn_lock);
1178 status = AE_NO_MEMORY;
1179 goto out;
1180 }
1181
1182 conn->pin = pin;
1183 conn->desc = desc;
1184 list_add_tail(&conn->node, &achip->conns);
1185 }
1186
1187 mutex_unlock(&achip->conn_lock);
1188
1189 if (function == ACPI_WRITE)
1190 gpiod_set_raw_value_cansleep(desc, !!(*value & BIT(i)));
1191 else
1192 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
1193 }
1194
1195out:
1196 ACPI_FREE(ares);
1197 return status;
1198}
1199
1200static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
1201{
1202 struct gpio_chip *chip = achip->chip;
1203 acpi_handle handle = ACPI_HANDLE(chip->parent);
1204 acpi_status status;
1205
1206 INIT_LIST_HEAD(&achip->conns);
1207 mutex_init(&achip->conn_lock);
1208 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1209 acpi_gpio_adr_space_handler,
1210 NULL, achip);
1211 if (ACPI_FAILURE(status))
1212 dev_err(chip->parent,
1213 "Failed to install GPIO OpRegion handler\n");
1214}
1215
1216static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
1217{
1218 struct gpio_chip *chip = achip->chip;
1219 acpi_handle handle = ACPI_HANDLE(chip->parent);
1220 struct acpi_gpio_connection *conn, *tmp;
1221 acpi_status status;
1222
1223 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
1224 acpi_gpio_adr_space_handler);
1225 if (ACPI_FAILURE(status)) {
1226 dev_err(chip->parent,
1227 "Failed to remove GPIO OpRegion handler\n");
1228 return;
1229 }
1230
1231 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
1232 gpiochip_free_own_desc(conn->desc);
1233 list_del(&conn->node);
1234 kfree(conn);
1235 }
1236}
1237
1238static struct gpio_desc *
1239acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
1240 struct fwnode_handle *fwnode,
1241 const char **name,
1242 unsigned long *lflags,
1243 enum gpiod_flags *dflags)
1244{
1245 struct gpio_chip *chip = achip->chip;
1246 struct gpio_desc *desc;
1247 u32 gpios[2];
1248 int ret;
1249
1250 *lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
1251 *dflags = GPIOD_ASIS;
1252 *name = NULL;
1253
1254 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
1255 ARRAY_SIZE(gpios));
1256 if (ret < 0)
1257 return ERR_PTR(ret);
1258
1259 desc = gpiochip_get_desc(chip, gpios[0]);
1260 if (IS_ERR(desc))
1261 return desc;
1262
1263 if (gpios[1])
1264 *lflags |= GPIO_ACTIVE_LOW;
1265
1266 if (fwnode_property_present(fwnode, "input"))
1267 *dflags |= GPIOD_IN;
1268 else if (fwnode_property_present(fwnode, "output-low"))
1269 *dflags |= GPIOD_OUT_LOW;
1270 else if (fwnode_property_present(fwnode, "output-high"))
1271 *dflags |= GPIOD_OUT_HIGH;
1272 else
1273 return ERR_PTR(-EINVAL);
1274
1275 fwnode_property_read_string(fwnode, "line-name", name);
1276
1277 return desc;
1278}
1279
1280static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
1281{
1282 struct gpio_chip *chip = achip->chip;
1283 struct fwnode_handle *fwnode;
1284
1285 device_for_each_child_node(chip->parent, fwnode) {
1286 unsigned long lflags;
1287 enum gpiod_flags dflags;
1288 struct gpio_desc *desc;
1289 const char *name;
1290 int ret;
1291
1292 if (!fwnode_property_present(fwnode, "gpio-hog"))
1293 continue;
1294
1295 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
1296 &lflags, &dflags);
1297 if (IS_ERR(desc))
1298 continue;
1299
1300 ret = gpiod_hog(desc, name, lflags, dflags);
1301 if (ret) {
1302 dev_err(chip->parent, "Failed to hog GPIO\n");
1303 fwnode_handle_put(fwnode);
1304 return;
1305 }
1306 }
1307}
1308
1309void acpi_gpiochip_add(struct gpio_chip *chip)
1310{
1311 struct acpi_gpio_chip *acpi_gpio;
1312 struct acpi_device *adev;
1313 acpi_status status;
1314
1315 if (!chip || !chip->parent)
1316 return;
1317
1318 adev = ACPI_COMPANION(chip->parent);
1319 if (!adev)
1320 return;
1321
1322 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1323 if (!acpi_gpio) {
1324 dev_err(chip->parent,
1325 "Failed to allocate memory for ACPI GPIO chip\n");
1326 return;
1327 }
1328
1329 acpi_gpio->chip = chip;
1330 INIT_LIST_HEAD(&acpi_gpio->events);
1331 INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);
1332
1333 status = acpi_attach_data(adev->handle, acpi_gpio_chip_dh, acpi_gpio);
1334 if (ACPI_FAILURE(status)) {
1335 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1336 kfree(acpi_gpio);
1337 return;
1338 }
1339
1340 acpi_gpiochip_request_regions(acpi_gpio);
1341 acpi_gpiochip_scan_gpios(acpi_gpio);
1342 acpi_dev_clear_dependencies(adev);
1343}
1344
1345void acpi_gpiochip_remove(struct gpio_chip *chip)
1346{
1347 struct acpi_gpio_chip *acpi_gpio;
1348 acpi_handle handle;
1349 acpi_status status;
1350
1351 if (!chip || !chip->parent)
1352 return;
1353
1354 handle = ACPI_HANDLE(chip->parent);
1355 if (!handle)
1356 return;
1357
1358 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1359 if (ACPI_FAILURE(status)) {
1360 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1361 return;
1362 }
1363
1364 acpi_gpiochip_free_regions(acpi_gpio);
1365
1366 acpi_detach_data(handle, acpi_gpio_chip_dh);
1367 kfree(acpi_gpio);
1368}
1369
1370static int acpi_gpio_package_count(const union acpi_object *obj)
1371{
1372 const union acpi_object *element = obj->package.elements;
1373 const union acpi_object *end = element + obj->package.count;
1374 unsigned int count = 0;
1375
1376 while (element < end) {
1377 switch (element->type) {
1378 case ACPI_TYPE_LOCAL_REFERENCE:
1379 element += 3;
1380 fallthrough;
1381 case ACPI_TYPE_INTEGER:
1382 element++;
1383 count++;
1384 break;
1385
1386 default:
1387 return -EPROTO;
1388 }
1389 }
1390
1391 return count;
1392}
1393
1394static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1395{
1396 unsigned int *count = data;
1397
1398 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1399 *count += ares->data.gpio.pin_table_length;
1400
1401 return 1;
1402}
1403
1404/**
1405 * acpi_gpio_count - count the GPIOs associated with a device / function
1406 * @dev: GPIO consumer, can be %NULL for system-global GPIOs
1407 * @con_id: function within the GPIO consumer
1408 *
1409 * Return:
1410 * The number of GPIOs associated with a device / function or %-ENOENT,
1411 * if no GPIO has been assigned to the requested function.
1412 */
1413int acpi_gpio_count(struct device *dev, const char *con_id)
1414{
1415 struct acpi_device *adev = ACPI_COMPANION(dev);
1416 const union acpi_object *obj;
1417 const struct acpi_gpio_mapping *gm;
1418 int count = -ENOENT;
1419 int ret;
1420 char propname[32];
1421 unsigned int i;
1422
1423 /* Try first from _DSD */
1424 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1425 if (con_id)
1426 snprintf(propname, sizeof(propname), "%s-%s",
1427 con_id, gpio_suffixes[i]);
1428 else
1429 snprintf(propname, sizeof(propname), "%s",
1430 gpio_suffixes[i]);
1431
1432 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1433 &obj);
1434 if (ret == 0) {
1435 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1436 count = 1;
1437 else if (obj->type == ACPI_TYPE_PACKAGE)
1438 count = acpi_gpio_package_count(obj);
1439 } else if (adev->driver_gpios) {
1440 for (gm = adev->driver_gpios; gm->name; gm++)
1441 if (strcmp(propname, gm->name) == 0) {
1442 count = gm->size;
1443 break;
1444 }
1445 }
1446 if (count > 0)
1447 break;
1448 }
1449
1450 /* Then from plain _CRS GPIOs */
1451 if (count < 0) {
1452 struct list_head resource_list;
1453 unsigned int crs_count = 0;
1454
1455 if (!acpi_can_fallback_to_crs(adev, con_id))
1456 return count;
1457
1458 INIT_LIST_HEAD(&resource_list);
1459 acpi_dev_get_resources(adev, &resource_list,
1460 acpi_find_gpio_count, &crs_count);
1461 acpi_dev_free_resource_list(&resource_list);
1462 if (crs_count > 0)
1463 count = crs_count;
1464 }
1465 return count ? count : -ENOENT;
1466}
1467
1468/* Run deferred acpi_gpiochip_request_irqs() */
1469static int __init acpi_gpio_handle_deferred_request_irqs(void)
1470{
1471 struct acpi_gpio_chip *acpi_gpio, *tmp;
1472
1473 mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
1474 list_for_each_entry_safe(acpi_gpio, tmp,
1475 &acpi_gpio_deferred_req_irqs_list,
1476 deferred_req_irqs_list_entry)
1477 acpi_gpiochip_request_irqs(acpi_gpio);
1478
1479 acpi_gpio_deferred_req_irqs_done = true;
1480 mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
1481
1482 return 0;
1483}
1484/* We must use _sync so that this runs after the first deferred_probe run */
1485late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);
1486
1487static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
1488 {
1489 /*
1490 * The Minix Neo Z83-4 has a micro-USB-B id-pin handler for
1491 * a non existing micro-USB-B connector which puts the HDMI
1492 * DDC pins in GPIO mode, breaking HDMI support.
1493 */
1494 .matches = {
1495 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
1496 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
1497 },
1498 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1499 .no_edge_events_on_boot = true,
1500 },
1501 },
1502 {
1503 /*
1504 * The Terra Pad 1061 has a micro-USB-B id-pin handler, which
1505 * instead of controlling the actual micro-USB-B turns the 5V
1506 * boost for its USB-A connector off. The actual micro-USB-B
1507 * connector is wired for charging only.
1508 */
1509 .matches = {
1510 DMI_MATCH(DMI_SYS_VENDOR, "Wortmann_AG"),
1511 DMI_MATCH(DMI_PRODUCT_NAME, "TERRA_PAD_1061"),
1512 },
1513 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1514 .no_edge_events_on_boot = true,
1515 },
1516 },
1517 {
1518 /*
1519 * The Dell Venue 10 Pro 5055, with Bay Trail SoC + TI PMIC uses an
1520 * external embedded-controller connected via I2C + an ACPI GPIO
1521 * event handler on INT33FFC:02 pin 12, causing spurious wakeups.
1522 */
1523 .matches = {
1524 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
1525 DMI_MATCH(DMI_PRODUCT_NAME, "Venue 10 Pro 5055"),
1526 },
1527 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1528 .ignore_wake = "INT33FC:02@12",
1529 },
1530 },
1531 {
1532 /*
1533 * HP X2 10 models with Cherry Trail SoC + TI PMIC use an
1534 * external embedded-controller connected via I2C + an ACPI GPIO
1535 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1536 * When suspending by closing the LID, the power to the USB
1537 * keyboard is turned off, causing INT0002 ACPI events to
1538 * trigger once the XHCI controller notices the keyboard is
1539 * gone. So INT0002 events cause spurious wakeups too. Ignoring
1540 * EC wakes breaks wakeup when opening the lid, the user needs
1541 * to press the power-button to wakeup the system. The
1542 * alternative is suspend simply not working, which is worse.
1543 */
1544 .matches = {
1545 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1546 DMI_MATCH(DMI_PRODUCT_NAME, "HP x2 Detachable 10-p0XX"),
1547 },
1548 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1549 .ignore_wake = "INT33FF:01@0,INT0002:00@2",
1550 },
1551 },
1552 {
1553 /*
1554 * HP X2 10 models with Bay Trail SoC + AXP288 PMIC use an
1555 * external embedded-controller connected via I2C + an ACPI GPIO
1556 * event handler on INT33FC:02 pin 28, causing spurious wakeups.
1557 */
1558 .matches = {
1559 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1560 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1561 DMI_MATCH(DMI_BOARD_NAME, "815D"),
1562 },
1563 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1564 .ignore_wake = "INT33FC:02@28",
1565 },
1566 },
1567 {
1568 /*
1569 * HP X2 10 models with Cherry Trail SoC + AXP288 PMIC use an
1570 * external embedded-controller connected via I2C + an ACPI GPIO
1571 * event handler on INT33FF:01 pin 0, causing spurious wakeups.
1572 */
1573 .matches = {
1574 DMI_MATCH(DMI_SYS_VENDOR, "HP"),
1575 DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion x2 Detachable"),
1576 DMI_MATCH(DMI_BOARD_NAME, "813E"),
1577 },
1578 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1579 .ignore_wake = "INT33FF:01@0",
1580 },
1581 },
1582 {
1583 /*
1584 * Interrupt storm caused from edge triggered floating pin
1585 * Found in BIOS UX325UAZ.300
1586 * https://bugzilla.kernel.org/show_bug.cgi?id=216208
1587 */
1588 .matches = {
1589 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
1590 DMI_MATCH(DMI_PRODUCT_NAME, "ZenBook UX325UAZ_UM325UAZ"),
1591 },
1592 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1593 .ignore_interrupt = "AMDI0030:00@18",
1594 },
1595 },
1596 {
1597 /*
1598 * Spurious wakeups from TP_ATTN# pin
1599 * Found in BIOS 1.7.8
1600 * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
1601 */
1602 .matches = {
1603 DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),
1604 },
1605 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1606 .ignore_wake = "ELAN0415:00@9",
1607 },
1608 },
1609 {
1610 /*
1611 * Spurious wakeups from TP_ATTN# pin
1612 * Found in BIOS 1.7.8
1613 * https://gitlab.freedesktop.org/drm/amd/-/issues/1722#note_1720627
1614 */
1615 .matches = {
1616 DMI_MATCH(DMI_BOARD_NAME, "NL5xRU"),
1617 },
1618 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1619 .ignore_wake = "ELAN0415:00@9",
1620 },
1621 },
1622 {
1623 /*
1624 * Spurious wakeups from TP_ATTN# pin
1625 * Found in BIOS 1.7.7
1626 */
1627 .matches = {
1628 DMI_MATCH(DMI_BOARD_NAME, "NH5xAx"),
1629 },
1630 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1631 .ignore_wake = "SYNA1202:00@16",
1632 },
1633 },
1634 {
1635 /*
1636 * On the Peaq C1010 2-in-1 INT33FC:00 pin 3 is connected to
1637 * a "dolby" button. At the ACPI level an _AEI event-handler
1638 * is connected which sets an ACPI variable to 1 on both
1639 * edges. This variable can be polled + cleared to 0 using
1640 * WMI. But since the variable is set on both edges the WMI
1641 * interface is pretty useless even when polling.
1642 * So instead the x86-android-tablets code instantiates
1643 * a gpio-keys platform device for it.
1644 * Ignore the _AEI handler for the pin, so that it is not busy.
1645 */
1646 .matches = {
1647 DMI_MATCH(DMI_SYS_VENDOR, "PEAQ"),
1648 DMI_MATCH(DMI_PRODUCT_NAME, "PEAQ PMM C1010 MD99187"),
1649 },
1650 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1651 .ignore_interrupt = "INT33FC:00@3",
1652 },
1653 },
1654 {
1655 /*
1656 * Spurious wakeups from TP_ATTN# pin
1657 * Found in BIOS 0.35
1658 * https://gitlab.freedesktop.org/drm/amd/-/issues/3073
1659 */
1660 .matches = {
1661 DMI_MATCH(DMI_SYS_VENDOR, "GPD"),
1662 DMI_MATCH(DMI_PRODUCT_NAME, "G1619-04"),
1663 },
1664 .driver_data = &(struct acpi_gpiolib_dmi_quirk) {
1665 .ignore_wake = "PNP0C50:00@8",
1666 },
1667 },
1668 {} /* Terminating entry */
1669};
1670
1671static int __init acpi_gpio_setup_params(void)
1672{
1673 const struct acpi_gpiolib_dmi_quirk *quirk = NULL;
1674 const struct dmi_system_id *id;
1675
1676 id = dmi_first_match(gpiolib_acpi_quirks);
1677 if (id)
1678 quirk = id->driver_data;
1679
1680 if (run_edge_events_on_boot < 0) {
1681 if (quirk && quirk->no_edge_events_on_boot)
1682 run_edge_events_on_boot = 0;
1683 else
1684 run_edge_events_on_boot = 1;
1685 }
1686
1687 if (ignore_wake == NULL && quirk && quirk->ignore_wake)
1688 ignore_wake = quirk->ignore_wake;
1689
1690 if (ignore_interrupt == NULL && quirk && quirk->ignore_interrupt)
1691 ignore_interrupt = quirk->ignore_interrupt;
1692
1693 return 0;
1694}
1695
1696/* Directly after dmi_setup() which runs as core_initcall() */
1697postcore_initcall(acpi_gpio_setup_params);
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/gpio/machine.h>
18#include <linux/export.h>
19#include <linux/acpi.h>
20#include <linux/interrupt.h>
21#include <linux/mutex.h>
22#include <linux/pinctrl/pinctrl.h>
23
24#include "gpiolib.h"
25
26struct acpi_gpio_event {
27 struct list_head node;
28 acpi_handle handle;
29 unsigned int pin;
30 unsigned int irq;
31 struct gpio_desc *desc;
32};
33
34struct acpi_gpio_connection {
35 struct list_head node;
36 unsigned int pin;
37 struct gpio_desc *desc;
38};
39
40struct acpi_gpio_chip {
41 /*
42 * ACPICA requires that the first field of the context parameter
43 * passed to acpi_install_address_space_handler() is large enough
44 * to hold struct acpi_connection_info.
45 */
46 struct acpi_connection_info conn_info;
47 struct list_head conns;
48 struct mutex conn_lock;
49 struct gpio_chip *chip;
50 struct list_head events;
51};
52
53static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
54{
55 if (!gc->parent)
56 return false;
57
58 return ACPI_HANDLE(gc->parent) == data;
59}
60
61/**
62 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
63 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
64 * @pin: ACPI GPIO pin number (0-based, controller-relative)
65 *
66 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
67 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
68 * controller does not have gpiochip registered at the moment. This is to
69 * support probe deferral.
70 */
71static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
72{
73 struct gpio_chip *chip;
74 acpi_handle handle;
75 acpi_status status;
76
77 status = acpi_get_handle(NULL, path, &handle);
78 if (ACPI_FAILURE(status))
79 return ERR_PTR(-ENODEV);
80
81 chip = gpiochip_find(handle, acpi_gpiochip_find);
82 if (!chip)
83 return ERR_PTR(-EPROBE_DEFER);
84
85 return gpiochip_get_desc(chip, pin);
86}
87
88static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
89{
90 struct acpi_gpio_event *event = data;
91
92 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
93
94 return IRQ_HANDLED;
95}
96
97static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
98{
99 struct acpi_gpio_event *event = data;
100
101 acpi_execute_simple_method(event->handle, NULL, event->pin);
102
103 return IRQ_HANDLED;
104}
105
106static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
107{
108 /* The address of this function is used as a key. */
109}
110
111bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
112 struct acpi_resource_gpio **agpio)
113{
114 struct acpi_resource_gpio *gpio;
115
116 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
117 return false;
118
119 gpio = &ares->data.gpio;
120 if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
121 return false;
122
123 *agpio = gpio;
124 return true;
125}
126EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
127
128static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
129 void *context)
130{
131 struct acpi_gpio_chip *acpi_gpio = context;
132 struct gpio_chip *chip = acpi_gpio->chip;
133 struct acpi_resource_gpio *agpio;
134 acpi_handle handle, evt_handle;
135 struct acpi_gpio_event *event;
136 irq_handler_t handler = NULL;
137 struct gpio_desc *desc;
138 unsigned long irqflags;
139 int ret, pin, irq;
140
141 if (!acpi_gpio_get_irq_resource(ares, &agpio))
142 return AE_OK;
143
144 handle = ACPI_HANDLE(chip->parent);
145 pin = agpio->pin_table[0];
146
147 if (pin <= 255) {
148 char ev_name[5];
149 sprintf(ev_name, "_%c%02hhX",
150 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
151 pin);
152 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
153 handler = acpi_gpio_irq_handler;
154 }
155 if (!handler) {
156 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
157 handler = acpi_gpio_irq_handler_evt;
158 }
159 if (!handler)
160 return AE_OK;
161
162 desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
163 if (IS_ERR(desc)) {
164 dev_err(chip->parent, "Failed to request GPIO\n");
165 return AE_ERROR;
166 }
167
168 gpiod_direction_input(desc);
169
170 ret = gpiochip_lock_as_irq(chip, pin);
171 if (ret) {
172 dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
173 goto fail_free_desc;
174 }
175
176 irq = gpiod_to_irq(desc);
177 if (irq < 0) {
178 dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
179 goto fail_unlock_irq;
180 }
181
182 irqflags = IRQF_ONESHOT;
183 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
184 if (agpio->polarity == ACPI_ACTIVE_HIGH)
185 irqflags |= IRQF_TRIGGER_HIGH;
186 else
187 irqflags |= IRQF_TRIGGER_LOW;
188 } else {
189 switch (agpio->polarity) {
190 case ACPI_ACTIVE_HIGH:
191 irqflags |= IRQF_TRIGGER_RISING;
192 break;
193 case ACPI_ACTIVE_LOW:
194 irqflags |= IRQF_TRIGGER_FALLING;
195 break;
196 default:
197 irqflags |= IRQF_TRIGGER_RISING |
198 IRQF_TRIGGER_FALLING;
199 break;
200 }
201 }
202
203 event = kzalloc(sizeof(*event), GFP_KERNEL);
204 if (!event)
205 goto fail_unlock_irq;
206
207 event->handle = evt_handle;
208 event->irq = irq;
209 event->pin = pin;
210 event->desc = desc;
211
212 ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
213 "ACPI:Event", event);
214 if (ret) {
215 dev_err(chip->parent,
216 "Failed to setup interrupt handler for %d\n",
217 event->irq);
218 goto fail_free_event;
219 }
220
221 if (agpio->wake_capable == ACPI_WAKE_CAPABLE)
222 enable_irq_wake(irq);
223
224 list_add_tail(&event->node, &acpi_gpio->events);
225 return AE_OK;
226
227fail_free_event:
228 kfree(event);
229fail_unlock_irq:
230 gpiochip_unlock_as_irq(chip, pin);
231fail_free_desc:
232 gpiochip_free_own_desc(desc);
233
234 return AE_ERROR;
235}
236
237/**
238 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
239 * @chip: GPIO chip
240 *
241 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
242 * handled by ACPI event methods which need to be called from the GPIO
243 * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
244 * gpio pins have acpi event methods and assigns interrupt handlers that calls
245 * the acpi event methods for those pins.
246 */
247void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
248{
249 struct acpi_gpio_chip *acpi_gpio;
250 acpi_handle handle;
251 acpi_status status;
252
253 if (!chip->parent || !chip->to_irq)
254 return;
255
256 handle = ACPI_HANDLE(chip->parent);
257 if (!handle)
258 return;
259
260 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
261 if (ACPI_FAILURE(status))
262 return;
263
264 acpi_walk_resources(handle, "_AEI",
265 acpi_gpiochip_request_interrupt, acpi_gpio);
266}
267EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
268
269/**
270 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
271 * @chip: GPIO chip
272 *
273 * Free interrupts associated with GPIO ACPI event method for the given
274 * GPIO chip.
275 */
276void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
277{
278 struct acpi_gpio_chip *acpi_gpio;
279 struct acpi_gpio_event *event, *ep;
280 acpi_handle handle;
281 acpi_status status;
282
283 if (!chip->parent || !chip->to_irq)
284 return;
285
286 handle = ACPI_HANDLE(chip->parent);
287 if (!handle)
288 return;
289
290 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
291 if (ACPI_FAILURE(status))
292 return;
293
294 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
295 struct gpio_desc *desc;
296
297 if (irqd_is_wakeup_set(irq_get_irq_data(event->irq)))
298 disable_irq_wake(event->irq);
299
300 free_irq(event->irq, event);
301 desc = event->desc;
302 if (WARN_ON(IS_ERR(desc)))
303 continue;
304 gpiochip_unlock_as_irq(chip, event->pin);
305 gpiochip_free_own_desc(desc);
306 list_del(&event->node);
307 kfree(event);
308 }
309}
310EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
311
312int acpi_dev_add_driver_gpios(struct acpi_device *adev,
313 const struct acpi_gpio_mapping *gpios)
314{
315 if (adev && gpios) {
316 adev->driver_gpios = gpios;
317 return 0;
318 }
319 return -EINVAL;
320}
321EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
322
323static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
324{
325 acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
326}
327
328int devm_acpi_dev_add_driver_gpios(struct device *dev,
329 const struct acpi_gpio_mapping *gpios)
330{
331 void *res;
332 int ret;
333
334 res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
335 if (!res)
336 return -ENOMEM;
337
338 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
339 if (ret) {
340 devres_free(res);
341 return ret;
342 }
343 devres_add(dev, res);
344 return 0;
345}
346EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
347
348void devm_acpi_dev_remove_driver_gpios(struct device *dev)
349{
350 WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
351}
352EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
353
354static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
355 const char *name, int index,
356 struct acpi_reference_args *args,
357 unsigned int *quirks)
358{
359 const struct acpi_gpio_mapping *gm;
360
361 if (!adev->driver_gpios)
362 return false;
363
364 for (gm = adev->driver_gpios; gm->name; gm++)
365 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
366 const struct acpi_gpio_params *par = gm->data + index;
367
368 args->adev = adev;
369 args->args[0] = par->crs_entry_index;
370 args->args[1] = par->line_index;
371 args->args[2] = par->active_low;
372 args->nargs = 3;
373
374 *quirks = gm->quirks;
375 return true;
376 }
377
378 return false;
379}
380
381static enum gpiod_flags
382acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
383{
384 bool pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
385
386 switch (agpio->io_restriction) {
387 case ACPI_IO_RESTRICT_INPUT:
388 return GPIOD_IN;
389 case ACPI_IO_RESTRICT_OUTPUT:
390 /*
391 * ACPI GPIO resources don't contain an initial value for the
392 * GPIO. Therefore we deduce that value from the pull field
393 * instead. If the pin is pulled up we assume default to be
394 * high, otherwise low.
395 */
396 return pull_up ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
397 default:
398 /*
399 * Assume that the BIOS has configured the direction and pull
400 * accordingly.
401 */
402 return GPIOD_ASIS;
403 }
404}
405
406static int
407__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
408{
409 int ret = 0;
410
411 /*
412 * Check if the BIOS has IoRestriction with explicitly set direction
413 * and update @flags accordingly. Otherwise use whatever caller asked
414 * for.
415 */
416 if (update & GPIOD_FLAGS_BIT_DIR_SET) {
417 enum gpiod_flags diff = *flags ^ update;
418
419 /*
420 * Check if caller supplied incompatible GPIO initialization
421 * flags.
422 *
423 * Return %-EINVAL to notify that firmware has different
424 * settings and we are going to use them.
425 */
426 if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
427 ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
428 ret = -EINVAL;
429 *flags = update;
430 }
431 return ret;
432}
433
434int
435acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
436{
437 struct device *dev = &info->adev->dev;
438 enum gpiod_flags old = *flags;
439 int ret;
440
441 ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
442 if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
443 if (ret)
444 dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
445 } else {
446 if (ret)
447 dev_dbg(dev, "Override GPIO initialization flags\n");
448 *flags = old;
449 }
450
451 return ret;
452}
453
454struct acpi_gpio_lookup {
455 struct acpi_gpio_info info;
456 int index;
457 int pin_index;
458 bool active_low;
459 struct gpio_desc *desc;
460 int n;
461};
462
463static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
464{
465 struct acpi_gpio_lookup *lookup = data;
466
467 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
468 return 1;
469
470 if (lookup->n++ == lookup->index && !lookup->desc) {
471 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
472 int pin_index = lookup->pin_index;
473
474 if (pin_index >= agpio->pin_table_length)
475 return 1;
476
477 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
478 agpio->pin_table[pin_index]);
479 lookup->info.gpioint =
480 agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
481
482 /*
483 * Polarity and triggering are only specified for GpioInt
484 * resource.
485 * Note: we expect here:
486 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
487 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
488 */
489 if (lookup->info.gpioint) {
490 lookup->info.flags = GPIOD_IN;
491 lookup->info.polarity = agpio->polarity;
492 lookup->info.triggering = agpio->triggering;
493 } else {
494 lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
495 lookup->info.polarity = lookup->active_low;
496 }
497 }
498
499 return 1;
500}
501
502static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
503 struct acpi_gpio_info *info)
504{
505 struct acpi_device *adev = lookup->info.adev;
506 struct list_head res_list;
507 int ret;
508
509 INIT_LIST_HEAD(&res_list);
510
511 ret = acpi_dev_get_resources(adev, &res_list,
512 acpi_populate_gpio_lookup,
513 lookup);
514 if (ret < 0)
515 return ret;
516
517 acpi_dev_free_resource_list(&res_list);
518
519 if (!lookup->desc)
520 return -ENOENT;
521
522 if (info)
523 *info = lookup->info;
524 return 0;
525}
526
527static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
528 const char *propname, int index,
529 struct acpi_gpio_lookup *lookup)
530{
531 struct acpi_reference_args args;
532 unsigned int quirks = 0;
533 int ret;
534
535 memset(&args, 0, sizeof(args));
536 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
537 &args);
538 if (ret) {
539 struct acpi_device *adev = to_acpi_device_node(fwnode);
540
541 if (!adev)
542 return ret;
543
544 if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
545 &quirks))
546 return ret;
547 }
548 /*
549 * The property was found and resolved, so need to lookup the GPIO based
550 * on returned args.
551 */
552 if (args.nargs != 3)
553 return -EPROTO;
554
555 lookup->index = args.args[0];
556 lookup->pin_index = args.args[1];
557 lookup->active_low = !!args.args[2];
558
559 lookup->info.adev = args.adev;
560 lookup->info.quirks = quirks;
561 return 0;
562}
563
564/**
565 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
566 * @adev: pointer to a ACPI device to get GPIO from
567 * @propname: Property name of the GPIO (optional)
568 * @index: index of GpioIo/GpioInt resource (starting from %0)
569 * @info: info pointer to fill in (optional)
570 *
571 * Function goes through ACPI resources for @adev and based on @index looks
572 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
573 * and returns it. @index matches GpioIo/GpioInt resources only so if there
574 * are total %3 GPIO resources, the index goes from %0 to %2.
575 *
576 * If @propname is specified the GPIO is looked using device property. In
577 * that case @index is used to select the GPIO entry in the property value
578 * (in case of multiple).
579 *
580 * If the GPIO cannot be translated or there is an error an ERR_PTR is
581 * returned.
582 *
583 * Note: if the GPIO resource has multiple entries in the pin list, this
584 * function only returns the first.
585 */
586static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
587 const char *propname, int index,
588 struct acpi_gpio_info *info)
589{
590 struct acpi_gpio_lookup lookup;
591 int ret;
592
593 if (!adev)
594 return ERR_PTR(-ENODEV);
595
596 memset(&lookup, 0, sizeof(lookup));
597 lookup.index = index;
598
599 if (propname) {
600 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
601
602 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
603 propname, index, &lookup);
604 if (ret)
605 return ERR_PTR(ret);
606
607 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
608 dev_name(&lookup.info.adev->dev), lookup.index,
609 lookup.pin_index, lookup.active_low);
610 } else {
611 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
612 lookup.info.adev = adev;
613 }
614
615 ret = acpi_gpio_resource_lookup(&lookup, info);
616 return ret ? ERR_PTR(ret) : lookup.desc;
617}
618
619struct gpio_desc *acpi_find_gpio(struct device *dev,
620 const char *con_id,
621 unsigned int idx,
622 enum gpiod_flags *dflags,
623 enum gpio_lookup_flags *lookupflags)
624{
625 struct acpi_device *adev = ACPI_COMPANION(dev);
626 struct acpi_gpio_info info;
627 struct gpio_desc *desc;
628 char propname[32];
629 int i;
630
631 /* Try first from _DSD */
632 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
633 if (con_id) {
634 snprintf(propname, sizeof(propname), "%s-%s",
635 con_id, gpio_suffixes[i]);
636 } else {
637 snprintf(propname, sizeof(propname), "%s",
638 gpio_suffixes[i]);
639 }
640
641 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
642 if (!IS_ERR(desc))
643 break;
644 if (PTR_ERR(desc) == -EPROBE_DEFER)
645 return ERR_CAST(desc);
646 }
647
648 /* Then from plain _CRS GPIOs */
649 if (IS_ERR(desc)) {
650 if (!acpi_can_fallback_to_crs(adev, con_id))
651 return ERR_PTR(-ENOENT);
652
653 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
654 if (IS_ERR(desc))
655 return desc;
656 }
657
658 if (info.gpioint &&
659 (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
660 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
661 return ERR_PTR(-ENOENT);
662 }
663
664 if (info.polarity == GPIO_ACTIVE_LOW)
665 *lookupflags |= GPIO_ACTIVE_LOW;
666
667 acpi_gpio_update_gpiod_flags(dflags, &info);
668 return desc;
669}
670
671/**
672 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
673 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
674 * @propname: Property name of the GPIO
675 * @index: index of GpioIo/GpioInt resource (starting from %0)
676 * @info: info pointer to fill in (optional)
677 *
678 * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
679 * Otherwise (ie. it is a data-only non-device object), use the property-based
680 * GPIO lookup to get to the GPIO resource with the relevant information and use
681 * that to obtain the GPIO descriptor to return.
682 */
683struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
684 const char *propname, int index,
685 struct acpi_gpio_info *info)
686{
687 struct acpi_gpio_lookup lookup;
688 struct acpi_device *adev;
689 int ret;
690
691 adev = to_acpi_device_node(fwnode);
692 if (adev)
693 return acpi_get_gpiod_by_index(adev, propname, index, info);
694
695 if (!is_acpi_data_node(fwnode))
696 return ERR_PTR(-ENODEV);
697
698 if (!propname)
699 return ERR_PTR(-EINVAL);
700
701 memset(&lookup, 0, sizeof(lookup));
702 lookup.index = index;
703
704 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
705 if (ret)
706 return ERR_PTR(ret);
707
708 ret = acpi_gpio_resource_lookup(&lookup, info);
709 return ret ? ERR_PTR(ret) : lookup.desc;
710}
711
712/**
713 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
714 * @adev: pointer to a ACPI device to get IRQ from
715 * @index: index of GpioInt resource (starting from %0)
716 *
717 * If the device has one or more GpioInt resources, this function can be
718 * used to translate from the GPIO offset in the resource to the Linux IRQ
719 * number.
720 *
721 * The function is idempotent, though each time it runs it will configure GPIO
722 * pin direction according to the flags in GpioInt resource.
723 *
724 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
725 */
726int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
727{
728 int idx, i;
729 unsigned int irq_flags;
730 int ret;
731
732 for (i = 0, idx = 0; idx <= index; i++) {
733 struct acpi_gpio_info info;
734 struct gpio_desc *desc;
735
736 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
737
738 /* Ignore -EPROBE_DEFER, it only matters if idx matches */
739 if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
740 return PTR_ERR(desc);
741
742 if (info.gpioint && idx++ == index) {
743 char label[32];
744 int irq;
745
746 if (IS_ERR(desc))
747 return PTR_ERR(desc);
748
749 irq = gpiod_to_irq(desc);
750 if (irq < 0)
751 return irq;
752
753 snprintf(label, sizeof(label), "GpioInt() %d", index);
754 ret = gpiod_configure_flags(desc, label, 0, info.flags);
755 if (ret < 0)
756 return ret;
757
758 irq_flags = acpi_dev_get_irq_type(info.triggering,
759 info.polarity);
760
761 /* Set type if specified and different than the current one */
762 if (irq_flags != IRQ_TYPE_NONE &&
763 irq_flags != irq_get_trigger_type(irq))
764 irq_set_irq_type(irq, irq_flags);
765
766 return irq;
767 }
768
769 }
770 return -ENOENT;
771}
772EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
773
774static acpi_status
775acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
776 u32 bits, u64 *value, void *handler_context,
777 void *region_context)
778{
779 struct acpi_gpio_chip *achip = region_context;
780 struct gpio_chip *chip = achip->chip;
781 struct acpi_resource_gpio *agpio;
782 struct acpi_resource *ares;
783 int pin_index = (int)address;
784 acpi_status status;
785 int length;
786 int i;
787
788 status = acpi_buffer_to_resource(achip->conn_info.connection,
789 achip->conn_info.length, &ares);
790 if (ACPI_FAILURE(status))
791 return status;
792
793 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
794 ACPI_FREE(ares);
795 return AE_BAD_PARAMETER;
796 }
797
798 agpio = &ares->data.gpio;
799
800 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
801 function == ACPI_WRITE)) {
802 ACPI_FREE(ares);
803 return AE_BAD_PARAMETER;
804 }
805
806 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
807 for (i = pin_index; i < length; ++i) {
808 int pin = agpio->pin_table[i];
809 struct acpi_gpio_connection *conn;
810 struct gpio_desc *desc;
811 bool found;
812
813 mutex_lock(&achip->conn_lock);
814
815 found = false;
816 list_for_each_entry(conn, &achip->conns, node) {
817 if (conn->pin == pin) {
818 found = true;
819 desc = conn->desc;
820 break;
821 }
822 }
823
824 /*
825 * The same GPIO can be shared between operation region and
826 * event but only if the access here is ACPI_READ. In that
827 * case we "borrow" the event GPIO instead.
828 */
829 if (!found && agpio->sharable == ACPI_SHARED &&
830 function == ACPI_READ) {
831 struct acpi_gpio_event *event;
832
833 list_for_each_entry(event, &achip->events, node) {
834 if (event->pin == pin) {
835 desc = event->desc;
836 found = true;
837 break;
838 }
839 }
840 }
841
842 if (!found) {
843 enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
844 const char *label = "ACPI:OpRegion";
845 int err;
846
847 desc = gpiochip_request_own_desc(chip, pin, label);
848 if (IS_ERR(desc)) {
849 status = AE_ERROR;
850 mutex_unlock(&achip->conn_lock);
851 goto out;
852 }
853
854 err = gpiod_configure_flags(desc, label, 0, flags);
855 if (err < 0) {
856 status = AE_NOT_CONFIGURED;
857 gpiochip_free_own_desc(desc);
858 mutex_unlock(&achip->conn_lock);
859 goto out;
860 }
861
862 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
863 if (!conn) {
864 status = AE_NO_MEMORY;
865 gpiochip_free_own_desc(desc);
866 mutex_unlock(&achip->conn_lock);
867 goto out;
868 }
869
870 conn->pin = pin;
871 conn->desc = desc;
872 list_add_tail(&conn->node, &achip->conns);
873 }
874
875 mutex_unlock(&achip->conn_lock);
876
877 if (function == ACPI_WRITE)
878 gpiod_set_raw_value_cansleep(desc,
879 !!((1 << i) & *value));
880 else
881 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
882 }
883
884out:
885 ACPI_FREE(ares);
886 return status;
887}
888
889static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
890{
891 struct gpio_chip *chip = achip->chip;
892 acpi_handle handle = ACPI_HANDLE(chip->parent);
893 acpi_status status;
894
895 INIT_LIST_HEAD(&achip->conns);
896 mutex_init(&achip->conn_lock);
897 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
898 acpi_gpio_adr_space_handler,
899 NULL, achip);
900 if (ACPI_FAILURE(status))
901 dev_err(chip->parent,
902 "Failed to install GPIO OpRegion handler\n");
903}
904
905static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
906{
907 struct gpio_chip *chip = achip->chip;
908 acpi_handle handle = ACPI_HANDLE(chip->parent);
909 struct acpi_gpio_connection *conn, *tmp;
910 acpi_status status;
911
912 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
913 acpi_gpio_adr_space_handler);
914 if (ACPI_FAILURE(status)) {
915 dev_err(chip->parent,
916 "Failed to remove GPIO OpRegion handler\n");
917 return;
918 }
919
920 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
921 gpiochip_free_own_desc(conn->desc);
922 list_del(&conn->node);
923 kfree(conn);
924 }
925}
926
927static struct gpio_desc *acpi_gpiochip_parse_own_gpio(
928 struct acpi_gpio_chip *achip, struct fwnode_handle *fwnode,
929 const char **name, unsigned int *lflags, unsigned int *dflags)
930{
931 struct gpio_chip *chip = achip->chip;
932 struct gpio_desc *desc;
933 u32 gpios[2];
934 int ret;
935
936 *lflags = 0;
937 *dflags = 0;
938 *name = NULL;
939
940 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
941 ARRAY_SIZE(gpios));
942 if (ret < 0)
943 return ERR_PTR(ret);
944
945 desc = gpiochip_get_desc(chip, gpios[0]);
946 if (IS_ERR(desc))
947 return desc;
948
949 if (gpios[1])
950 *lflags |= GPIO_ACTIVE_LOW;
951
952 if (fwnode_property_present(fwnode, "input"))
953 *dflags |= GPIOD_IN;
954 else if (fwnode_property_present(fwnode, "output-low"))
955 *dflags |= GPIOD_OUT_LOW;
956 else if (fwnode_property_present(fwnode, "output-high"))
957 *dflags |= GPIOD_OUT_HIGH;
958 else
959 return ERR_PTR(-EINVAL);
960
961 fwnode_property_read_string(fwnode, "line-name", name);
962
963 return desc;
964}
965
966static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
967{
968 struct gpio_chip *chip = achip->chip;
969 struct fwnode_handle *fwnode;
970
971 device_for_each_child_node(chip->parent, fwnode) {
972 unsigned int lflags, dflags;
973 struct gpio_desc *desc;
974 const char *name;
975 int ret;
976
977 if (!fwnode_property_present(fwnode, "gpio-hog"))
978 continue;
979
980 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
981 &lflags, &dflags);
982 if (IS_ERR(desc))
983 continue;
984
985 ret = gpiod_hog(desc, name, lflags, dflags);
986 if (ret) {
987 dev_err(chip->parent, "Failed to hog GPIO\n");
988 fwnode_handle_put(fwnode);
989 return;
990 }
991 }
992}
993
994void acpi_gpiochip_add(struct gpio_chip *chip)
995{
996 struct acpi_gpio_chip *acpi_gpio;
997 acpi_handle handle;
998 acpi_status status;
999
1000 if (!chip || !chip->parent)
1001 return;
1002
1003 handle = ACPI_HANDLE(chip->parent);
1004 if (!handle)
1005 return;
1006
1007 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
1008 if (!acpi_gpio) {
1009 dev_err(chip->parent,
1010 "Failed to allocate memory for ACPI GPIO chip\n");
1011 return;
1012 }
1013
1014 acpi_gpio->chip = chip;
1015 INIT_LIST_HEAD(&acpi_gpio->events);
1016
1017 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
1018 if (ACPI_FAILURE(status)) {
1019 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
1020 kfree(acpi_gpio);
1021 return;
1022 }
1023
1024 if (!chip->names)
1025 devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));
1026
1027 acpi_gpiochip_request_regions(acpi_gpio);
1028 acpi_gpiochip_scan_gpios(acpi_gpio);
1029 acpi_walk_dep_device_list(handle);
1030}
1031
1032void acpi_gpiochip_remove(struct gpio_chip *chip)
1033{
1034 struct acpi_gpio_chip *acpi_gpio;
1035 acpi_handle handle;
1036 acpi_status status;
1037
1038 if (!chip || !chip->parent)
1039 return;
1040
1041 handle = ACPI_HANDLE(chip->parent);
1042 if (!handle)
1043 return;
1044
1045 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1046 if (ACPI_FAILURE(status)) {
1047 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1048 return;
1049 }
1050
1051 acpi_gpiochip_free_regions(acpi_gpio);
1052
1053 acpi_detach_data(handle, acpi_gpio_chip_dh);
1054 kfree(acpi_gpio);
1055}
1056
1057static int acpi_gpio_package_count(const union acpi_object *obj)
1058{
1059 const union acpi_object *element = obj->package.elements;
1060 const union acpi_object *end = element + obj->package.count;
1061 unsigned int count = 0;
1062
1063 while (element < end) {
1064 switch (element->type) {
1065 case ACPI_TYPE_LOCAL_REFERENCE:
1066 element += 3;
1067 /* Fallthrough */
1068 case ACPI_TYPE_INTEGER:
1069 element++;
1070 count++;
1071 break;
1072
1073 default:
1074 return -EPROTO;
1075 }
1076 }
1077
1078 return count;
1079}
1080
1081static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1082{
1083 unsigned int *count = data;
1084
1085 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1086 *count += ares->data.gpio.pin_table_length;
1087
1088 return 1;
1089}
1090
1091/**
1092 * acpi_gpio_count - return the number of GPIOs associated with a
1093 * device / function or -ENOENT if no GPIO has been
1094 * assigned to the requested function.
1095 * @dev: GPIO consumer, can be NULL for system-global GPIOs
1096 * @con_id: function within the GPIO consumer
1097 */
1098int acpi_gpio_count(struct device *dev, const char *con_id)
1099{
1100 struct acpi_device *adev = ACPI_COMPANION(dev);
1101 const union acpi_object *obj;
1102 const struct acpi_gpio_mapping *gm;
1103 int count = -ENOENT;
1104 int ret;
1105 char propname[32];
1106 unsigned int i;
1107
1108 /* Try first from _DSD */
1109 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1110 if (con_id)
1111 snprintf(propname, sizeof(propname), "%s-%s",
1112 con_id, gpio_suffixes[i]);
1113 else
1114 snprintf(propname, sizeof(propname), "%s",
1115 gpio_suffixes[i]);
1116
1117 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1118 &obj);
1119 if (ret == 0) {
1120 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1121 count = 1;
1122 else if (obj->type == ACPI_TYPE_PACKAGE)
1123 count = acpi_gpio_package_count(obj);
1124 } else if (adev->driver_gpios) {
1125 for (gm = adev->driver_gpios; gm->name; gm++)
1126 if (strcmp(propname, gm->name) == 0) {
1127 count = gm->size;
1128 break;
1129 }
1130 }
1131 if (count > 0)
1132 break;
1133 }
1134
1135 /* Then from plain _CRS GPIOs */
1136 if (count < 0) {
1137 struct list_head resource_list;
1138 unsigned int crs_count = 0;
1139
1140 if (!acpi_can_fallback_to_crs(adev, con_id))
1141 return count;
1142
1143 INIT_LIST_HEAD(&resource_list);
1144 acpi_dev_get_resources(adev, &resource_list,
1145 acpi_find_gpio_count, &crs_count);
1146 acpi_dev_free_resource_list(&resource_list);
1147 if (crs_count > 0)
1148 count = crs_count;
1149 }
1150 return count ? count : -ENOENT;
1151}
1152
1153bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
1154{
1155 /* Never allow fallback if the device has properties */
1156 if (adev->data.properties || adev->driver_gpios)
1157 return false;
1158
1159 return con_id == NULL;
1160}