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 if (agpio->wake_capable == ACPI_WAKE_CAPABLE)
270 enable_irq_wake(irq);
272 list_add_tail(&event->node, &acpi_gpio->events);
278 gpiochip_unlock_as_irq(chip, pin);
280 gpiochip_free_own_desc(desc);
286 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
289 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
290 * handled by ACPI event methods which need to be called from the GPIO
291 * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
292 * gpio pins have acpi event methods and assigns interrupt handlers that calls
293 * the acpi event methods for those pins.
295 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
297 struct acpi_gpio_chip *acpi_gpio;
301 if (!chip->parent || !chip->to_irq)
304 handle = ACPI_HANDLE(chip->parent);
308 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
309 if (ACPI_FAILURE(status))
312 acpi_walk_resources(handle, "_AEI",
313 acpi_gpiochip_request_interrupt, acpi_gpio);
315 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
318 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
321 * Free interrupts associated with GPIO ACPI event method for the given
324 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
326 struct acpi_gpio_chip *acpi_gpio;
327 struct acpi_gpio_event *event, *ep;
331 if (!chip->parent || !chip->to_irq)
334 handle = ACPI_HANDLE(chip->parent);
338 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
339 if (ACPI_FAILURE(status))
342 list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
343 struct gpio_desc *desc;
345 if (irqd_is_wakeup_set(irq_get_irq_data(event->irq)))
346 disable_irq_wake(event->irq);
348 free_irq(event->irq, event);
350 if (WARN_ON(IS_ERR(desc)))
352 gpiochip_unlock_as_irq(chip, event->pin);
353 gpiochip_free_own_desc(desc);
354 list_del(&event->node);
358 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);
360 int acpi_dev_add_driver_gpios(struct acpi_device *adev,
361 const struct acpi_gpio_mapping *gpios)
364 adev->driver_gpios = gpios;
369 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);
371 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
372 const char *name, int index,
373 struct acpi_reference_args *args)
375 const struct acpi_gpio_mapping *gm;
377 if (!adev->driver_gpios)
380 for (gm = adev->driver_gpios; gm->name; gm++)
381 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
382 const struct acpi_gpio_params *par = gm->data + index;
385 args->args[0] = par->crs_entry_index;
386 args->args[1] = par->line_index;
387 args->args[2] = par->active_low;
395 struct acpi_gpio_lookup {
396 struct acpi_gpio_info info;
400 struct acpi_device *adev;
401 struct gpio_desc *desc;
405 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
407 struct acpi_gpio_lookup *lookup = data;
409 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
412 if (lookup->n++ == lookup->index && !lookup->desc) {
413 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
414 int pin_index = lookup->pin_index;
416 if (pin_index >= agpio->pin_table_length)
419 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
420 agpio->pin_table[pin_index]);
421 lookup->info.gpioint =
422 agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
425 * Polarity and triggering are only specified for GpioInt
427 * Note: we expect here:
428 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
429 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
431 if (lookup->info.gpioint) {
432 lookup->info.polarity = agpio->polarity;
433 lookup->info.triggering = agpio->triggering;
441 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
442 struct acpi_gpio_info *info)
444 struct list_head res_list;
447 INIT_LIST_HEAD(&res_list);
449 ret = acpi_dev_get_resources(lookup->adev, &res_list,
450 acpi_populate_gpio_lookup,
455 acpi_dev_free_resource_list(&res_list);
461 *info = lookup->info;
462 if (lookup->active_low)
463 info->polarity = lookup->active_low;
468 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
469 const char *propname, int index,
470 struct acpi_gpio_lookup *lookup)
472 struct acpi_reference_args args;
475 memset(&args, 0, sizeof(args));
476 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
479 struct acpi_device *adev = to_acpi_device_node(fwnode);
484 if (!acpi_get_driver_gpio_data(adev, propname, index, &args))
488 * The property was found and resolved, so need to lookup the GPIO based
491 lookup->adev = args.adev;
495 lookup->index = args.args[0];
496 lookup->pin_index = args.args[1];
497 lookup->active_low = !!args.args[2];
503 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
504 * @adev: pointer to a ACPI device to get GPIO from
505 * @propname: Property name of the GPIO (optional)
506 * @index: index of GpioIo/GpioInt resource (starting from %0)
507 * @info: info pointer to fill in (optional)
509 * Function goes through ACPI resources for @adev and based on @index looks
510 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
511 * and returns it. @index matches GpioIo/GpioInt resources only so if there
512 * are total %3 GPIO resources, the index goes from %0 to %2.
514 * If @propname is specified the GPIO is looked using device property. In
515 * that case @index is used to select the GPIO entry in the property value
516 * (in case of multiple).
518 * If the GPIO cannot be translated or there is an error an ERR_PTR is
521 * Note: if the GPIO resource has multiple entries in the pin list, this
522 * function only returns the first.
524 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
525 const char *propname, int index,
526 struct acpi_gpio_info *info)
528 struct acpi_gpio_lookup lookup;
532 return ERR_PTR(-ENODEV);
534 memset(&lookup, 0, sizeof(lookup));
535 lookup.index = index;
538 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
540 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
541 propname, index, &lookup);
545 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
546 dev_name(&lookup.adev->dev), lookup.index,
547 lookup.pin_index, lookup.active_low);
549 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
553 ret = acpi_gpio_resource_lookup(&lookup, info);
554 return ret ? ERR_PTR(ret) : lookup.desc;
557 struct gpio_desc *acpi_find_gpio(struct device *dev,
560 enum gpiod_flags flags,
561 enum gpio_lookup_flags *lookupflags)
563 struct acpi_device *adev = ACPI_COMPANION(dev);
564 struct acpi_gpio_info info;
565 struct gpio_desc *desc;
569 /* Try first from _DSD */
570 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
571 if (con_id && strcmp(con_id, "gpios")) {
572 snprintf(propname, sizeof(propname), "%s-%s",
573 con_id, gpio_suffixes[i]);
575 snprintf(propname, sizeof(propname), "%s",
579 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
582 if (PTR_ERR(desc) == -EPROBE_DEFER)
583 return ERR_CAST(desc);
586 /* Then from plain _CRS GPIOs */
588 if (!acpi_can_fallback_to_crs(adev, con_id))
589 return ERR_PTR(-ENOENT);
591 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
595 if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) &&
597 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
598 return ERR_PTR(-ENOENT);
602 if (info.polarity == GPIO_ACTIVE_LOW)
603 *lookupflags |= GPIO_ACTIVE_LOW;
609 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
610 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
611 * @propname: Property name of the GPIO
612 * @index: index of GpioIo/GpioInt resource (starting from %0)
613 * @info: info pointer to fill in (optional)
615 * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
616 * Otherwise (ie. it is a data-only non-device object), use the property-based
617 * GPIO lookup to get to the GPIO resource with the relevant information and use
618 * that to obtain the GPIO descriptor to return.
620 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
621 const char *propname, int index,
622 struct acpi_gpio_info *info)
624 struct acpi_gpio_lookup lookup;
625 struct acpi_device *adev;
628 adev = to_acpi_device_node(fwnode);
630 return acpi_get_gpiod_by_index(adev, propname, index, info);
632 if (!is_acpi_data_node(fwnode))
633 return ERR_PTR(-ENODEV);
636 return ERR_PTR(-EINVAL);
638 memset(&lookup, 0, sizeof(lookup));
639 lookup.index = index;
641 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
645 ret = acpi_gpio_resource_lookup(&lookup, info);
646 return ret ? ERR_PTR(ret) : lookup.desc;
650 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
651 * @adev: pointer to a ACPI device to get IRQ from
652 * @index: index of GpioInt resource (starting from %0)
654 * If the device has one or more GpioInt resources, this function can be
655 * used to translate from the GPIO offset in the resource to the Linux IRQ
658 * Return: Linux IRQ number (>%0) on success, negative errno on failure.
660 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
663 unsigned int irq_flags;
666 for (i = 0, idx = 0; idx <= index; i++) {
667 struct acpi_gpio_info info;
668 struct gpio_desc *desc;
670 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
675 if (info.gpioint && idx++ == index) {
676 int irq = gpiod_to_irq(desc);
681 irq_flags = acpi_dev_get_irq_type(info.triggering,
684 /* Set type if specified and different than the current one */
685 if (irq_flags != IRQ_TYPE_NONE &&
686 irq_flags != irq_get_trigger_type(irq))
687 irq_set_irq_type(irq, irq_flags);
695 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
698 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
699 u32 bits, u64 *value, void *handler_context,
700 void *region_context)
702 struct acpi_gpio_chip *achip = region_context;
703 struct gpio_chip *chip = achip->chip;
704 struct acpi_resource_gpio *agpio;
705 struct acpi_resource *ares;
706 int pin_index = (int)address;
712 status = acpi_buffer_to_resource(achip->conn_info.connection,
713 achip->conn_info.length, &ares);
714 if (ACPI_FAILURE(status))
717 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
719 return AE_BAD_PARAMETER;
722 agpio = &ares->data.gpio;
723 pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
725 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
726 function == ACPI_WRITE)) {
728 return AE_BAD_PARAMETER;
731 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
732 for (i = pin_index; i < length; ++i) {
733 int pin = agpio->pin_table[i];
734 struct acpi_gpio_connection *conn;
735 struct gpio_desc *desc;
738 pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
740 status = AE_BAD_PARAMETER;
744 mutex_lock(&achip->conn_lock);
747 list_for_each_entry(conn, &achip->conns, node) {
748 if (conn->pin == pin) {
756 * The same GPIO can be shared between operation region and
757 * event but only if the access here is ACPI_READ. In that
758 * case we "borrow" the event GPIO instead.
760 if (!found && agpio->sharable == ACPI_SHARED &&
761 function == ACPI_READ) {
762 struct acpi_gpio_event *event;
764 list_for_each_entry(event, &achip->events, node) {
765 if (event->pin == pin) {
774 desc = gpiochip_request_own_desc(chip, pin,
778 mutex_unlock(&achip->conn_lock);
782 switch (agpio->io_restriction) {
783 case ACPI_IO_RESTRICT_INPUT:
784 gpiod_direction_input(desc);
786 case ACPI_IO_RESTRICT_OUTPUT:
788 * ACPI GPIO resources don't contain an
789 * initial value for the GPIO. Therefore we
790 * deduce that value from the pull field
791 * instead. If the pin is pulled up we
792 * assume default to be high, otherwise
795 gpiod_direction_output(desc, pull_up);
799 * Assume that the BIOS has configured the
800 * direction and pull accordingly.
805 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
807 status = AE_NO_MEMORY;
808 gpiochip_free_own_desc(desc);
809 mutex_unlock(&achip->conn_lock);
815 list_add_tail(&conn->node, &achip->conns);
818 mutex_unlock(&achip->conn_lock);
820 if (function == ACPI_WRITE)
821 gpiod_set_raw_value_cansleep(desc,
822 !!((1 << i) & *value));
824 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
832 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
834 struct gpio_chip *chip = achip->chip;
835 acpi_handle handle = ACPI_HANDLE(chip->parent);
838 INIT_LIST_HEAD(&achip->conns);
839 mutex_init(&achip->conn_lock);
840 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
841 acpi_gpio_adr_space_handler,
843 if (ACPI_FAILURE(status))
844 dev_err(chip->parent,
845 "Failed to install GPIO OpRegion handler\n");
848 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
850 struct gpio_chip *chip = achip->chip;
851 acpi_handle handle = ACPI_HANDLE(chip->parent);
852 struct acpi_gpio_connection *conn, *tmp;
855 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
856 acpi_gpio_adr_space_handler);
857 if (ACPI_FAILURE(status)) {
858 dev_err(chip->parent,
859 "Failed to remove GPIO OpRegion handler\n");
863 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
864 gpiochip_free_own_desc(conn->desc);
865 list_del(&conn->node);
870 static struct gpio_desc *acpi_gpiochip_parse_own_gpio(
871 struct acpi_gpio_chip *achip, struct fwnode_handle *fwnode,
872 const char **name, unsigned int *lflags, unsigned int *dflags)
874 struct gpio_chip *chip = achip->chip;
875 struct gpio_desc *desc;
883 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
888 ret = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, gpios[0]);
892 desc = gpiochip_get_desc(chip, ret);
897 *lflags |= GPIO_ACTIVE_LOW;
899 if (fwnode_property_present(fwnode, "input"))
901 else if (fwnode_property_present(fwnode, "output-low"))
902 *dflags |= GPIOD_OUT_LOW;
903 else if (fwnode_property_present(fwnode, "output-high"))
904 *dflags |= GPIOD_OUT_HIGH;
906 return ERR_PTR(-EINVAL);
908 fwnode_property_read_string(fwnode, "line-name", name);
913 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
915 struct gpio_chip *chip = achip->chip;
916 struct fwnode_handle *fwnode;
918 device_for_each_child_node(chip->parent, fwnode) {
919 unsigned int lflags, dflags;
920 struct gpio_desc *desc;
924 if (!fwnode_property_present(fwnode, "gpio-hog"))
927 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
932 ret = gpiod_hog(desc, name, lflags, dflags);
934 dev_err(chip->parent, "Failed to hog GPIO\n");
935 fwnode_handle_put(fwnode);
941 void acpi_gpiochip_add(struct gpio_chip *chip)
943 struct acpi_gpio_chip *acpi_gpio;
947 if (!chip || !chip->parent)
950 handle = ACPI_HANDLE(chip->parent);
954 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
956 dev_err(chip->parent,
957 "Failed to allocate memory for ACPI GPIO chip\n");
961 acpi_gpio->chip = chip;
962 INIT_LIST_HEAD(&acpi_gpio->events);
964 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
965 if (ACPI_FAILURE(status)) {
966 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
972 devprop_gpiochip_set_names(chip);
974 acpi_gpiochip_request_regions(acpi_gpio);
975 acpi_gpiochip_scan_gpios(acpi_gpio);
976 acpi_walk_dep_device_list(handle);
979 void acpi_gpiochip_remove(struct gpio_chip *chip)
981 struct acpi_gpio_chip *acpi_gpio;
985 if (!chip || !chip->parent)
988 handle = ACPI_HANDLE(chip->parent);
992 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
993 if (ACPI_FAILURE(status)) {
994 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
998 acpi_gpiochip_free_regions(acpi_gpio);
1000 acpi_detach_data(handle, acpi_gpio_chip_dh);
1004 static int acpi_gpio_package_count(const union acpi_object *obj)
1006 const union acpi_object *element = obj->package.elements;
1007 const union acpi_object *end = element + obj->package.count;
1008 unsigned int count = 0;
1010 while (element < end) {
1011 switch (element->type) {
1012 case ACPI_TYPE_LOCAL_REFERENCE:
1015 case ACPI_TYPE_INTEGER:
1028 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1030 unsigned int *count = data;
1032 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1033 *count += ares->data.gpio.pin_table_length;
1039 * acpi_gpio_count - return the number of GPIOs associated with a
1040 * device / function or -ENOENT if no GPIO has been
1041 * assigned to the requested function.
1042 * @dev: GPIO consumer, can be NULL for system-global GPIOs
1043 * @con_id: function within the GPIO consumer
1045 int acpi_gpio_count(struct device *dev, const char *con_id)
1047 struct acpi_device *adev = ACPI_COMPANION(dev);
1048 const union acpi_object *obj;
1049 const struct acpi_gpio_mapping *gm;
1050 int count = -ENOENT;
1055 /* Try first from _DSD */
1056 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1057 if (con_id && strcmp(con_id, "gpios"))
1058 snprintf(propname, sizeof(propname), "%s-%s",
1059 con_id, gpio_suffixes[i]);
1061 snprintf(propname, sizeof(propname), "%s",
1064 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1067 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1069 else if (obj->type == ACPI_TYPE_PACKAGE)
1070 count = acpi_gpio_package_count(obj);
1071 } else if (adev->driver_gpios) {
1072 for (gm = adev->driver_gpios; gm->name; gm++)
1073 if (strcmp(propname, gm->name) == 0) {
1082 /* Then from plain _CRS GPIOs */
1084 struct list_head resource_list;
1085 unsigned int crs_count = 0;
1087 INIT_LIST_HEAD(&resource_list);
1088 acpi_dev_get_resources(adev, &resource_list,
1089 acpi_find_gpio_count, &crs_count);
1090 acpi_dev_free_resource_list(&resource_list);
1097 struct acpi_crs_lookup {
1098 struct list_head node;
1099 struct acpi_device *adev;
1103 static DEFINE_MUTEX(acpi_crs_lookup_lock);
1104 static LIST_HEAD(acpi_crs_lookup_list);
1106 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
1108 struct acpi_crs_lookup *l, *lookup = NULL;
1110 /* Never allow fallback if the device has properties */
1111 if (adev->data.properties || adev->driver_gpios)
1114 mutex_lock(&acpi_crs_lookup_lock);
1116 list_for_each_entry(l, &acpi_crs_lookup_list, node) {
1117 if (l->adev == adev) {
1124 lookup = kmalloc(sizeof(*lookup), GFP_KERNEL);
1126 lookup->adev = adev;
1127 lookup->con_id = kstrdup(con_id, GFP_KERNEL);
1128 list_add_tail(&lookup->node, &acpi_crs_lookup_list);
1132 mutex_unlock(&acpi_crs_lookup_lock);
1135 ((!lookup->con_id && !con_id) ||
1136 (lookup->con_id && con_id &&
1137 strcmp(lookup->con_id, con_id) == 0));