2 * ACPI helpers for GPIO API
4 * Copyright (C) 2012, Intel Corporation
5 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
6 * Mika Westerberg <mika.westerberg@linux.intel.com>
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.
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>
26 struct acpi_gpio_event {
27 struct list_head node;
31 struct gpio_desc *desc;
34 struct acpi_gpio_connection {
35 struct list_head node;
37 struct gpio_desc *desc;
40 struct acpi_gpio_chip {
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.
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;
53 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
58 return ACPI_HANDLE(gc->parent) == data;
63 * acpi_gpiochip_pin_to_gpio_offset() - translates ACPI GPIO to Linux GPIO
65 * @pin: ACPI GPIO pin number from GpioIo/GpioInt resource
67 * Function takes ACPI GpioIo/GpioInt pin number as a parameter and
68 * translates it to a corresponding offset suitable to be passed to a
69 * GPIO controller driver.
71 * Typically the returned offset is same as @pin, but if the GPIO
72 * controller uses pin controller and the mapping is not contiguous the
73 * offset might be different.
75 static int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev, int pin)
77 struct gpio_pin_range *pin_range;
79 /* If there are no ranges in this chip, use 1:1 mapping */
80 if (list_empty(&gdev->pin_ranges))
83 list_for_each_entry(pin_range, &gdev->pin_ranges, node) {
84 const struct pinctrl_gpio_range *range = &pin_range->range;
88 for (i = 0; i < range->npins; i++) {
89 if (range->pins[i] == pin)
90 return range->base + i - gdev->base;
93 if (pin >= range->pin_base &&
94 pin < range->pin_base + range->npins) {
97 gpio_base = range->base - gdev->base;
98 return gpio_base + pin - range->pin_base;
106 static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_device *gdev,
114 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
115 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
116 * @pin: ACPI GPIO pin number (0-based, controller-relative)
118 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
119 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
120 * controller does not have gpiochip registered at the moment. This is to
121 * support probe deferral.
123 static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
125 struct gpio_chip *chip;
130 status = acpi_get_handle(NULL, path, &handle);
131 if (ACPI_FAILURE(status))
132 return ERR_PTR(-ENODEV);
134 chip = gpiochip_find(handle, acpi_gpiochip_find);
136 return ERR_PTR(-EPROBE_DEFER);
138 offset = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
140 return ERR_PTR(offset);
142 return gpiochip_get_desc(chip, offset);
145 static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
147 struct acpi_gpio_event *event = data;
149 acpi_evaluate_object(event->handle, NULL, NULL, NULL);
154 static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
156 struct acpi_gpio_event *event = data;
158 acpi_execute_simple_method(event->handle, NULL, event->pin);
163 static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
165 /* The address of this function is used as a key. */
168 static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
171 struct acpi_gpio_chip *acpi_gpio = context;
172 struct gpio_chip *chip = acpi_gpio->chip;
173 struct acpi_resource_gpio *agpio;
174 acpi_handle handle, evt_handle;
175 struct acpi_gpio_event *event;
176 irq_handler_t handler = NULL;
177 struct gpio_desc *desc;
178 unsigned long irqflags;
181 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
184 agpio = &ares->data.gpio;
185 if (agpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
188 handle = ACPI_HANDLE(chip->parent);
189 pin = agpio->pin_table[0];
193 sprintf(ev_name, "_%c%02X",
194 agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
196 if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
197 handler = acpi_gpio_irq_handler;
200 if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
201 handler = acpi_gpio_irq_handler_evt;
204 return AE_BAD_PARAMETER;
206 pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
208 return AE_BAD_PARAMETER;
210 desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event");
212 dev_err(chip->parent, "Failed to request GPIO\n");
216 gpiod_direction_input(desc);
218 ret = gpiochip_lock_as_irq(chip, pin);
220 dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
224 irq = gpiod_to_irq(desc);
226 dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
227 goto fail_unlock_irq;
230 irqflags = IRQF_ONESHOT;
231 if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
232 if (agpio->polarity == ACPI_ACTIVE_HIGH)
233 irqflags |= IRQF_TRIGGER_HIGH;
235 irqflags |= IRQF_TRIGGER_LOW;
237 switch (agpio->polarity) {
238 case ACPI_ACTIVE_HIGH:
239 irqflags |= IRQF_TRIGGER_RISING;
241 case ACPI_ACTIVE_LOW:
242 irqflags |= IRQF_TRIGGER_FALLING;
245 irqflags |= IRQF_TRIGGER_RISING |
246 IRQF_TRIGGER_FALLING;
251 event = kzalloc(sizeof(*event), GFP_KERNEL);
253 goto fail_unlock_irq;
255 event->handle = evt_handle;
260 ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
261 "ACPI:Event", event);
263 dev_err(chip->parent,
264 "Failed to setup interrupt handler for %d\n",
266 goto fail_free_event;
269 list_add_tail(&event->node, &acpi_gpio->events);
275 gpiochip_unlock_as_irq(chip, pin);
277 gpiochip_free_own_desc(desc);
283 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
286 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
287 * handled by ACPI event methods which need to be called from the GPIO
288 * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
289 * gpio pins have acpi event methods and assigns interrupt handlers that calls
290 * the acpi event methods for those pins.
292 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
294 struct acpi_gpio_chip *acpi_gpio;
298 if (!chip->parent || !chip->to_irq)
301 handle = ACPI_HANDLE(chip->parent);
305 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
306 if (ACPI_FAILURE(status))
309 acpi_walk_resources(handle, "_AEI",
310 acpi_gpiochip_request_interrupt, acpi_gpio);
312 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
315 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
318 * Free interrupts associated with GPIO ACPI event method for the given
321 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
323 struct acpi_gpio_chip *acpi_gpio;
324 struct acpi_gpio_event *event, *ep;
328 if (!chip->parent || !chip->to_irq)
331 handle = ACPI_HANDLE(chip->parent);
335 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
336 if (ACPI_FAILURE(status))
339 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
340 struct gpio_desc *desc;
342 free_irq(event->irq, event);
344 if (WARN_ON(IS_ERR(desc)))
346 gpiochip_unlock_as_irq(chip, event->pin);
347 gpiochip_free_own_desc(desc);
348 list_del(&event->node);
352 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
354 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
355 const struct acpi_gpio_mapping *gpios)
358 adev->driver_gpios = gpios;
363 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
365 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
366 const char *name, int index,
367 struct acpi_reference_args *args)
369 const struct acpi_gpio_mapping *gm;
371 if (!adev->driver_gpios)
374 for (gm = adev->driver_gpios; gm->name; gm++)
375 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
376 const struct acpi_gpio_params *par = gm->data + index;
379 args->args[0] = par->crs_entry_index;
380 args->args[1] = par->line_index;
381 args->args[2] = par->active_low;
389 struct acpi_gpio_lookup {
390 struct acpi_gpio_info info;
394 struct acpi_device *adev;
395 struct gpio_desc *desc;
399 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
401 struct acpi_gpio_lookup *lookup = data;
403 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
406 if (lookup->n++ == lookup->index && !lookup->desc) {
407 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
408 int pin_index = lookup->pin_index;
410 if (pin_index >= agpio->pin_table_length)
413 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
414 agpio->pin_table[pin_index]);
415 lookup->info.gpioint =
416 agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
419 * ActiveLow is only specified for GpioInt resource. If
420 * GpioIo is used then the only way to set the flag is
421 * to use _DSD "gpios" property.
422 * Note: we expect here:
423 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
424 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
426 if (lookup->info.gpioint) {
427 lookup->info.polarity = agpio->polarity;
428 lookup->info.triggering = agpio->triggering;
436 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
437 struct acpi_gpio_info *info)
439 struct list_head res_list;
442 INIT_LIST_HEAD(&res_list);
444 ret = acpi_dev_get_resources(lookup->adev, &res_list,
445 acpi_populate_gpio_lookup,
450 acpi_dev_free_resource_list(&res_list);
456 *info = lookup->info;
457 if (lookup->active_low)
458 info->polarity = lookup->active_low;
463 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
464 const char *propname, int index,
465 struct acpi_gpio_lookup *lookup)
467 struct acpi_reference_args args;
470 memset(&args, 0, sizeof(args));
471 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
474 struct acpi_device *adev = to_acpi_device_node(fwnode);
479 if (!acpi_get_driver_gpio_data(adev, propname, index, &args))
483 * The property was found and resolved, so need to lookup the GPIO based
486 lookup->adev = args.adev;
490 lookup->index = args.args[0];
491 lookup->pin_index = args.args[1];
492 lookup->active_low = !!args.args[2];
498 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
499 * @adev: pointer to a ACPI device to get GPIO from
500 * @propname: Property name of the GPIO (optional)
501 * @index: index of GpioIo/GpioInt resource (starting from %0)
502 * @info: info pointer to fill in (optional)
504 * Function goes through ACPI resources for @adev and based on @index looks
505 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
506 * and returns it. @index matches GpioIo/GpioInt resources only so if there
507 * are total %3 GPIO resources, the index goes from %0 to %2.
509 * If @propname is specified the GPIO is looked using device property. In
510 * that case @index is used to select the GPIO entry in the property value
511 * (in case of multiple).
513 * If the GPIO cannot be translated or there is an error an ERR_PTR is
516 * Note: if the GPIO resource has multiple entries in the pin list, this
517 * function only returns the first.
519 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
520 const char *propname, int index,
521 struct acpi_gpio_info *info)
523 struct acpi_gpio_lookup lookup;
527 return ERR_PTR(-ENODEV);
529 memset(&lookup, 0, sizeof(lookup));
530 lookup.index = index;
533 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
535 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
536 propname, index, &lookup);
540 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
541 dev_name(&lookup.adev->dev), lookup.index,
542 lookup.pin_index, lookup.active_low);
544 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
548 ret = acpi_gpio_resource_lookup(&lookup, info);
549 return ret ? ERR_PTR(ret) : lookup.desc;
552 struct gpio_desc *acpi_find_gpio(struct device *dev,
555 enum gpiod_flags flags,
556 enum gpio_lookup_flags *lookupflags)
558 struct acpi_device *adev = ACPI_COMPANION(dev);
559 struct acpi_gpio_info info;
560 struct gpio_desc *desc;
564 /* Try first from _DSD */
565 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
566 if (con_id && strcmp(con_id, "gpios")) {
567 snprintf(propname, sizeof(propname), "%s-%s",
568 con_id, gpio_suffixes[i]);
570 snprintf(propname, sizeof(propname), "%s",
574 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
575 if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
579 /* Then from plain _CRS GPIOs */
581 if (!acpi_can_fallback_to_crs(adev, con_id))
582 return ERR_PTR(-ENOENT);
584 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
588 if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) &&
590 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
591 return ERR_PTR(-ENOENT);
595 if (info.polarity == GPIO_ACTIVE_LOW)
596 *lookupflags |= GPIO_ACTIVE_LOW;
602 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
603 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
604 * @propname: Property name of the GPIO
605 * @index: index of GpioIo/GpioInt resource (starting from %0)
606 * @info: info pointer to fill in (optional)
608 * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
609 * Otherwise (ie. it is a data-only non-device object), use the property-based
610 * GPIO lookup to get to the GPIO resource with the relevant information and use
611 * that to obtain the GPIO descriptor to return.
613 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
614 const char *propname, int index,
615 struct acpi_gpio_info *info)
617 struct acpi_gpio_lookup lookup;
618 struct acpi_device *adev;
621 adev = to_acpi_device_node(fwnode);
623 return acpi_get_gpiod_by_index(adev, propname, index, info);
625 if (!is_acpi_data_node(fwnode))
626 return ERR_PTR(-ENODEV);
629 return ERR_PTR(-EINVAL);
631 memset(&lookup, 0, sizeof(lookup));
632 lookup.index = index;
634 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
638 ret = acpi_gpio_resource_lookup(&lookup, info);
639 return ret ? ERR_PTR(ret) : lookup.desc;
643 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
644 * @adev: pointer to a ACPI device to get IRQ from
645 * @index: index of GpioInt resource (starting from %0)
647 * If the device has one or more GpioInt resources, this function can be
648 * used to translate from the GPIO offset in the resource to the Linux IRQ
651 * Return: Linux IRQ number (>%0) on success, negative errno on failure.
653 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
656 unsigned int irq_flags;
658 for (i = 0, idx = 0; idx <= index; i++) {
659 struct acpi_gpio_info info;
660 struct gpio_desc *desc;
662 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
665 if (info.gpioint && idx++ == index) {
666 int irq = gpiod_to_irq(desc);
671 irq_flags = acpi_dev_get_irq_type(info.triggering,
674 /* Set type if specified and different than the current one */
675 if (irq_flags != IRQ_TYPE_NONE &&
676 irq_flags != irq_get_trigger_type(irq))
677 irq_set_irq_type(irq, irq_flags);
685 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
688 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
689 u32 bits, u64 *value, void *handler_context,
690 void *region_context)
692 struct acpi_gpio_chip *achip = region_context;
693 struct gpio_chip *chip = achip->chip;
694 struct acpi_resource_gpio *agpio;
695 struct acpi_resource *ares;
696 int pin_index = (int)address;
702 status = acpi_buffer_to_resource(achip->conn_info.connection,
703 achip->conn_info.length, &ares);
704 if (ACPI_FAILURE(status))
707 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
709 return AE_BAD_PARAMETER;
712 agpio = &ares->data.gpio;
713 pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
715 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
716 function == ACPI_WRITE)) {
718 return AE_BAD_PARAMETER;
721 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
722 for (i = pin_index; i < length; ++i) {
723 int pin = agpio->pin_table[i];
724 struct acpi_gpio_connection *conn;
725 struct gpio_desc *desc;
728 pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
730 status = AE_BAD_PARAMETER;
734 mutex_lock(&achip->conn_lock);
737 list_for_each_entry(conn, &achip->conns, node) {
738 if (conn->pin == pin) {
746 * The same GPIO can be shared between operation region and
747 * event but only if the access here is ACPI_READ. In that
748 * case we "borrow" the event GPIO instead.
750 if (!found && agpio->sharable == ACPI_SHARED &&
751 function == ACPI_READ) {
752 struct acpi_gpio_event *event;
754 list_for_each_entry(event, &achip->events, node) {
755 if (event->pin == pin) {
764 desc = gpiochip_request_own_desc(chip, pin,
768 mutex_unlock(&achip->conn_lock);
772 switch (agpio->io_restriction) {
773 case ACPI_IO_RESTRICT_INPUT:
774 gpiod_direction_input(desc);
776 case ACPI_IO_RESTRICT_OUTPUT:
778 * ACPI GPIO resources don't contain an
779 * initial value for the GPIO. Therefore we
780 * deduce that value from the pull field
781 * instead. If the pin is pulled up we
782 * assume default to be high, otherwise
785 gpiod_direction_output(desc, pull_up);
789 * Assume that the BIOS has configured the
790 * direction and pull accordingly.
795 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
797 status = AE_NO_MEMORY;
798 gpiochip_free_own_desc(desc);
799 mutex_unlock(&achip->conn_lock);
805 list_add_tail(&conn->node, &achip->conns);
808 mutex_unlock(&achip->conn_lock);
810 if (function == ACPI_WRITE)
811 gpiod_set_raw_value_cansleep(desc,
812 !!((1 << i) & *value));
814 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
822 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
824 struct gpio_chip *chip = achip->chip;
825 acpi_handle handle = ACPI_HANDLE(chip->parent);
828 INIT_LIST_HEAD(&achip->conns);
829 mutex_init(&achip->conn_lock);
830 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
831 acpi_gpio_adr_space_handler,
833 if (ACPI_FAILURE(status))
834 dev_err(chip->parent,
835 "Failed to install GPIO OpRegion handler\n");
838 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
840 struct gpio_chip *chip = achip->chip;
841 acpi_handle handle = ACPI_HANDLE(chip->parent);
842 struct acpi_gpio_connection *conn, *tmp;
845 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
846 acpi_gpio_adr_space_handler);
847 if (ACPI_FAILURE(status)) {
848 dev_err(chip->parent,
849 "Failed to remove GPIO OpRegion handler\n");
853 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
854 gpiochip_free_own_desc(conn->desc);
855 list_del(&conn->node);
860 struct gpio_desc *acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
861 struct fwnode_handle *fwnode, const char **name, unsigned int *lflags,
862 unsigned int *dflags)
864 struct gpio_chip *chip = achip->chip;
865 struct gpio_desc *desc;
869 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
874 ret = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, gpios[0]);
878 desc = gpiochip_get_desc(chip, ret);
887 *lflags |= GPIO_ACTIVE_LOW;
889 if (fwnode_property_present(fwnode, "input"))
891 else if (fwnode_property_present(fwnode, "output-low"))
892 *dflags |= GPIOD_OUT_LOW;
893 else if (fwnode_property_present(fwnode, "output-high"))
894 *dflags |= GPIOD_OUT_HIGH;
896 return ERR_PTR(-EINVAL);
898 fwnode_property_read_string(fwnode, "line-name", name);
903 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
905 struct gpio_chip *chip = achip->chip;
906 struct fwnode_handle *fwnode;
908 device_for_each_child_node(chip->parent, fwnode) {
909 unsigned int lflags, dflags;
910 struct gpio_desc *desc;
914 if (!fwnode_property_present(fwnode, "gpio-hog"))
917 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
922 ret = gpiod_hog(desc, name, lflags, dflags);
924 dev_err(chip->parent, "Failed to hog GPIO\n");
930 void acpi_gpiochip_add(struct gpio_chip *chip)
932 struct acpi_gpio_chip *acpi_gpio;
936 if (!chip || !chip->parent)
939 handle = ACPI_HANDLE(chip->parent);
943 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
945 dev_err(chip->parent,
946 "Failed to allocate memory for ACPI GPIO chip\n");
950 acpi_gpio->chip = chip;
951 INIT_LIST_HEAD(&acpi_gpio->events);
953 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
954 if (ACPI_FAILURE(status)) {
955 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
960 acpi_gpiochip_request_regions(acpi_gpio);
961 acpi_gpiochip_scan_gpios(acpi_gpio);
962 acpi_walk_dep_device_list(handle);
965 void acpi_gpiochip_remove(struct gpio_chip *chip)
967 struct acpi_gpio_chip *acpi_gpio;
971 if (!chip || !chip->parent)
974 handle = ACPI_HANDLE(chip->parent);
978 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
979 if (ACPI_FAILURE(status)) {
980 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
984 acpi_gpiochip_free_regions(acpi_gpio);
986 acpi_detach_data(handle, acpi_gpio_chip_dh);
990 static int acpi_gpio_package_count(const union acpi_object *obj)
992 const union acpi_object *element = obj->package.elements;
993 const union acpi_object *end = element + obj->package.count;
994 unsigned int count = 0;
996 while (element < end) {
997 switch (element->type) {
998 case ACPI_TYPE_LOCAL_REFERENCE:
1001 case ACPI_TYPE_INTEGER:
1014 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1016 unsigned int *count = data;
1018 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1019 *count += ares->data.gpio.pin_table_length;
1025 * acpi_gpio_count - return the number of GPIOs associated with a
1026 * device / function or -ENOENT if no GPIO has been
1027 * assigned to the requested function.
1028 * @dev: GPIO consumer, can be NULL for system-global GPIOs
1029 * @con_id: function within the GPIO consumer
1031 int acpi_gpio_count(struct device *dev, const char *con_id)
1033 struct acpi_device *adev = ACPI_COMPANION(dev);
1034 const union acpi_object *obj;
1035 const struct acpi_gpio_mapping *gm;
1036 int count = -ENOENT;
1041 /* Try first from _DSD */
1042 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1043 if (con_id && strcmp(con_id, "gpios"))
1044 snprintf(propname, sizeof(propname), "%s-%s",
1045 con_id, gpio_suffixes[i]);
1047 snprintf(propname, sizeof(propname), "%s",
1050 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1053 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1055 else if (obj->type == ACPI_TYPE_PACKAGE)
1056 count = acpi_gpio_package_count(obj);
1057 } else if (adev->driver_gpios) {
1058 for (gm = adev->driver_gpios; gm->name; gm++)
1059 if (strcmp(propname, gm->name) == 0) {
1068 /* Then from plain _CRS GPIOs */
1070 struct list_head resource_list;
1071 unsigned int crs_count = 0;
1073 INIT_LIST_HEAD(&resource_list);
1074 acpi_dev_get_resources(adev, &resource_list,
1075 acpi_find_gpio_count, &crs_count);
1076 acpi_dev_free_resource_list(&resource_list);
1083 struct acpi_crs_lookup {
1084 struct list_head node;
1085 struct acpi_device *adev;
1089 static DEFINE_MUTEX(acpi_crs_lookup_lock);
1090 static LIST_HEAD(acpi_crs_lookup_list);
1092 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
1094 struct acpi_crs_lookup *l, *lookup = NULL;
1096 /* Never allow fallback if the device has properties */
1097 if (adev->data.properties || adev->driver_gpios)
1100 mutex_lock(&acpi_crs_lookup_lock);
1102 list_for_each_entry(l, &acpi_crs_lookup_list, node) {
1103 if (l->adev == adev) {
1110 lookup = kmalloc(sizeof(*lookup), GFP_KERNEL);
1112 lookup->adev = adev;
1113 lookup->con_id = kstrdup(con_id, GFP_KERNEL);
1114 list_add_tail(&lookup->node, &acpi_crs_lookup_list);
1118 mutex_unlock(&acpi_crs_lookup_lock);
1121 ((!lookup->con_id && !con_id) ||
1122 (lookup->con_id && con_id &&
1123 strcmp(lookup->con_id, con_id) == 0));