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 void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
367 acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
370 int devm_acpi_dev_add_driver_gpios(struct device *dev,
371 const struct acpi_gpio_mapping *gpios)
376 res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
380 ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
385 devres_add(dev, res);
388 EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);
390 void devm_acpi_dev_remove_driver_gpios(struct device *dev)
392 WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
394 EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
396 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
397 const char *name, int index,
398 struct acpi_reference_args *args)
400 const struct acpi_gpio_mapping *gm;
402 if (!adev->driver_gpios)
405 for (gm = adev->driver_gpios; gm->name; gm++)
406 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
407 const struct acpi_gpio_params *par = gm->data + index;
410 args->args[0] = par->crs_entry_index;
411 args->args[1] = par->line_index;
412 args->args[2] = par->active_low;
420 struct acpi_gpio_lookup {
421 struct acpi_gpio_info info;
425 struct acpi_device *adev;
426 struct gpio_desc *desc;
430 static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
432 struct acpi_gpio_lookup *lookup = data;
434 if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
437 if (lookup->n++ == lookup->index && !lookup->desc) {
438 const struct acpi_resource_gpio *agpio = &ares->data.gpio;
439 int pin_index = lookup->pin_index;
441 if (pin_index >= agpio->pin_table_length)
444 lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
445 agpio->pin_table[pin_index]);
446 lookup->info.gpioint =
447 agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
450 * Polarity and triggering are only specified for GpioInt
452 * Note: we expect here:
453 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
454 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
456 if (lookup->info.gpioint) {
457 lookup->info.polarity = agpio->polarity;
458 lookup->info.triggering = agpio->triggering;
466 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
467 struct acpi_gpio_info *info)
469 struct list_head res_list;
472 INIT_LIST_HEAD(&res_list);
474 ret = acpi_dev_get_resources(lookup->adev, &res_list,
475 acpi_populate_gpio_lookup,
480 acpi_dev_free_resource_list(&res_list);
486 *info = lookup->info;
487 if (lookup->active_low)
488 info->polarity = lookup->active_low;
493 static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
494 const char *propname, int index,
495 struct acpi_gpio_lookup *lookup)
497 struct acpi_reference_args args;
500 memset(&args, 0, sizeof(args));
501 ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
504 struct acpi_device *adev = to_acpi_device_node(fwnode);
509 if (!acpi_get_driver_gpio_data(adev, propname, index, &args))
513 * The property was found and resolved, so need to lookup the GPIO based
516 lookup->adev = args.adev;
520 lookup->index = args.args[0];
521 lookup->pin_index = args.args[1];
522 lookup->active_low = !!args.args[2];
528 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
529 * @adev: pointer to a ACPI device to get GPIO from
530 * @propname: Property name of the GPIO (optional)
531 * @index: index of GpioIo/GpioInt resource (starting from %0)
532 * @info: info pointer to fill in (optional)
534 * Function goes through ACPI resources for @adev and based on @index looks
535 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
536 * and returns it. @index matches GpioIo/GpioInt resources only so if there
537 * are total %3 GPIO resources, the index goes from %0 to %2.
539 * If @propname is specified the GPIO is looked using device property. In
540 * that case @index is used to select the GPIO entry in the property value
541 * (in case of multiple).
543 * If the GPIO cannot be translated or there is an error an ERR_PTR is
546 * Note: if the GPIO resource has multiple entries in the pin list, this
547 * function only returns the first.
549 static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
550 const char *propname, int index,
551 struct acpi_gpio_info *info)
553 struct acpi_gpio_lookup lookup;
557 return ERR_PTR(-ENODEV);
559 memset(&lookup, 0, sizeof(lookup));
560 lookup.index = index;
563 dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);
565 ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
566 propname, index, &lookup);
570 dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
571 dev_name(&lookup.adev->dev), lookup.index,
572 lookup.pin_index, lookup.active_low);
574 dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
578 ret = acpi_gpio_resource_lookup(&lookup, info);
579 return ret ? ERR_PTR(ret) : lookup.desc;
582 struct gpio_desc *acpi_find_gpio(struct device *dev,
585 enum gpiod_flags flags,
586 enum gpio_lookup_flags *lookupflags)
588 struct acpi_device *adev = ACPI_COMPANION(dev);
589 struct acpi_gpio_info info;
590 struct gpio_desc *desc;
594 /* Try first from _DSD */
595 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
596 if (con_id && strcmp(con_id, "gpios")) {
597 snprintf(propname, sizeof(propname), "%s-%s",
598 con_id, gpio_suffixes[i]);
600 snprintf(propname, sizeof(propname), "%s",
604 desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
605 if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
609 /* Then from plain _CRS GPIOs */
611 if (!acpi_can_fallback_to_crs(adev, con_id))
612 return ERR_PTR(-ENOENT);
614 desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
618 if ((flags == GPIOD_OUT_LOW || flags == GPIOD_OUT_HIGH) &&
620 dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
621 return ERR_PTR(-ENOENT);
625 if (info.polarity == GPIO_ACTIVE_LOW)
626 *lookupflags |= GPIO_ACTIVE_LOW;
632 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
633 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
634 * @propname: Property name of the GPIO
635 * @index: index of GpioIo/GpioInt resource (starting from %0)
636 * @info: info pointer to fill in (optional)
638 * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
639 * Otherwise (ie. it is a data-only non-device object), use the property-based
640 * GPIO lookup to get to the GPIO resource with the relevant information and use
641 * that to obtain the GPIO descriptor to return.
643 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
644 const char *propname, int index,
645 struct acpi_gpio_info *info)
647 struct acpi_gpio_lookup lookup;
648 struct acpi_device *adev;
651 adev = to_acpi_device_node(fwnode);
653 return acpi_get_gpiod_by_index(adev, propname, index, info);
655 if (!is_acpi_data_node(fwnode))
656 return ERR_PTR(-ENODEV);
659 return ERR_PTR(-EINVAL);
661 memset(&lookup, 0, sizeof(lookup));
662 lookup.index = index;
664 ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
668 ret = acpi_gpio_resource_lookup(&lookup, info);
669 return ret ? ERR_PTR(ret) : lookup.desc;
673 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
674 * @adev: pointer to a ACPI device to get IRQ from
675 * @index: index of GpioInt resource (starting from %0)
677 * If the device has one or more GpioInt resources, this function can be
678 * used to translate from the GPIO offset in the resource to the Linux IRQ
681 * Return: Linux IRQ number (>%0) on success, negative errno on failure.
683 int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
686 unsigned int irq_flags;
689 for (i = 0, idx = 0; idx <= index; i++) {
690 struct acpi_gpio_info info;
691 struct gpio_desc *desc;
693 desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
698 if (info.gpioint && idx++ == index) {
699 int irq = gpiod_to_irq(desc);
704 irq_flags = acpi_dev_get_irq_type(info.triggering,
707 /* Set type if specified and different than the current one */
708 if (irq_flags != IRQ_TYPE_NONE &&
709 irq_flags != irq_get_trigger_type(irq))
710 irq_set_irq_type(irq, irq_flags);
718 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
721 acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
722 u32 bits, u64 *value, void *handler_context,
723 void *region_context)
725 struct acpi_gpio_chip *achip = region_context;
726 struct gpio_chip *chip = achip->chip;
727 struct acpi_resource_gpio *agpio;
728 struct acpi_resource *ares;
729 int pin_index = (int)address;
735 status = acpi_buffer_to_resource(achip->conn_info.connection,
736 achip->conn_info.length, &ares);
737 if (ACPI_FAILURE(status))
740 if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
742 return AE_BAD_PARAMETER;
745 agpio = &ares->data.gpio;
746 pull_up = agpio->pin_config == ACPI_PIN_CONFIG_PULLUP;
748 if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
749 function == ACPI_WRITE)) {
751 return AE_BAD_PARAMETER;
754 length = min(agpio->pin_table_length, (u16)(pin_index + bits));
755 for (i = pin_index; i < length; ++i) {
756 int pin = agpio->pin_table[i];
757 struct acpi_gpio_connection *conn;
758 struct gpio_desc *desc;
761 pin = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, pin);
763 status = AE_BAD_PARAMETER;
767 mutex_lock(&achip->conn_lock);
770 list_for_each_entry(conn, &achip->conns, node) {
771 if (conn->pin == pin) {
779 * The same GPIO can be shared between operation region and
780 * event but only if the access here is ACPI_READ. In that
781 * case we "borrow" the event GPIO instead.
783 if (!found && agpio->sharable == ACPI_SHARED &&
784 function == ACPI_READ) {
785 struct acpi_gpio_event *event;
787 list_for_each_entry(event, &achip->events, node) {
788 if (event->pin == pin) {
797 desc = gpiochip_request_own_desc(chip, pin,
801 mutex_unlock(&achip->conn_lock);
805 switch (agpio->io_restriction) {
806 case ACPI_IO_RESTRICT_INPUT:
807 gpiod_direction_input(desc);
809 case ACPI_IO_RESTRICT_OUTPUT:
811 * ACPI GPIO resources don't contain an
812 * initial value for the GPIO. Therefore we
813 * deduce that value from the pull field
814 * instead. If the pin is pulled up we
815 * assume default to be high, otherwise
818 gpiod_direction_output(desc, pull_up);
822 * Assume that the BIOS has configured the
823 * direction and pull accordingly.
828 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
830 status = AE_NO_MEMORY;
831 gpiochip_free_own_desc(desc);
832 mutex_unlock(&achip->conn_lock);
838 list_add_tail(&conn->node, &achip->conns);
841 mutex_unlock(&achip->conn_lock);
843 if (function == ACPI_WRITE)
844 gpiod_set_raw_value_cansleep(desc,
845 !!((1 << i) & *value));
847 *value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
855 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
857 struct gpio_chip *chip = achip->chip;
858 acpi_handle handle = ACPI_HANDLE(chip->parent);
861 INIT_LIST_HEAD(&achip->conns);
862 mutex_init(&achip->conn_lock);
863 status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
864 acpi_gpio_adr_space_handler,
866 if (ACPI_FAILURE(status))
867 dev_err(chip->parent,
868 "Failed to install GPIO OpRegion handler\n");
871 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
873 struct gpio_chip *chip = achip->chip;
874 acpi_handle handle = ACPI_HANDLE(chip->parent);
875 struct acpi_gpio_connection *conn, *tmp;
878 status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
879 acpi_gpio_adr_space_handler);
880 if (ACPI_FAILURE(status)) {
881 dev_err(chip->parent,
882 "Failed to remove GPIO OpRegion handler\n");
886 list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
887 gpiochip_free_own_desc(conn->desc);
888 list_del(&conn->node);
893 static struct gpio_desc *acpi_gpiochip_parse_own_gpio(
894 struct acpi_gpio_chip *achip, struct fwnode_handle *fwnode,
895 const char **name, unsigned int *lflags, unsigned int *dflags)
897 struct gpio_chip *chip = achip->chip;
898 struct gpio_desc *desc;
906 ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
911 ret = acpi_gpiochip_pin_to_gpio_offset(chip->gpiodev, gpios[0]);
915 desc = gpiochip_get_desc(chip, ret);
920 *lflags |= GPIO_ACTIVE_LOW;
922 if (fwnode_property_present(fwnode, "input"))
924 else if (fwnode_property_present(fwnode, "output-low"))
925 *dflags |= GPIOD_OUT_LOW;
926 else if (fwnode_property_present(fwnode, "output-high"))
927 *dflags |= GPIOD_OUT_HIGH;
929 return ERR_PTR(-EINVAL);
931 fwnode_property_read_string(fwnode, "line-name", name);
936 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
938 struct gpio_chip *chip = achip->chip;
939 struct fwnode_handle *fwnode;
941 device_for_each_child_node(chip->parent, fwnode) {
942 unsigned int lflags, dflags;
943 struct gpio_desc *desc;
947 if (!fwnode_property_present(fwnode, "gpio-hog"))
950 desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
955 ret = gpiod_hog(desc, name, lflags, dflags);
957 dev_err(chip->parent, "Failed to hog GPIO\n");
958 fwnode_handle_put(fwnode);
964 void acpi_gpiochip_add(struct gpio_chip *chip)
966 struct acpi_gpio_chip *acpi_gpio;
970 if (!chip || !chip->parent)
973 handle = ACPI_HANDLE(chip->parent);
977 acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
979 dev_err(chip->parent,
980 "Failed to allocate memory for ACPI GPIO chip\n");
984 acpi_gpio->chip = chip;
985 INIT_LIST_HEAD(&acpi_gpio->events);
987 status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
988 if (ACPI_FAILURE(status)) {
989 dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
995 devprop_gpiochip_set_names(chip);
997 acpi_gpiochip_request_regions(acpi_gpio);
998 acpi_gpiochip_scan_gpios(acpi_gpio);
999 acpi_walk_dep_device_list(handle);
1002 void acpi_gpiochip_remove(struct gpio_chip *chip)
1004 struct acpi_gpio_chip *acpi_gpio;
1008 if (!chip || !chip->parent)
1011 handle = ACPI_HANDLE(chip->parent);
1015 status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
1016 if (ACPI_FAILURE(status)) {
1017 dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
1021 acpi_gpiochip_free_regions(acpi_gpio);
1023 acpi_detach_data(handle, acpi_gpio_chip_dh);
1027 static int acpi_gpio_package_count(const union acpi_object *obj)
1029 const union acpi_object *element = obj->package.elements;
1030 const union acpi_object *end = element + obj->package.count;
1031 unsigned int count = 0;
1033 while (element < end) {
1034 switch (element->type) {
1035 case ACPI_TYPE_LOCAL_REFERENCE:
1038 case ACPI_TYPE_INTEGER:
1051 static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
1053 unsigned int *count = data;
1055 if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
1056 *count += ares->data.gpio.pin_table_length;
1062 * acpi_gpio_count - return the number of GPIOs associated with a
1063 * device / function or -ENOENT if no GPIO has been
1064 * assigned to the requested function.
1065 * @dev: GPIO consumer, can be NULL for system-global GPIOs
1066 * @con_id: function within the GPIO consumer
1068 int acpi_gpio_count(struct device *dev, const char *con_id)
1070 struct acpi_device *adev = ACPI_COMPANION(dev);
1071 const union acpi_object *obj;
1072 const struct acpi_gpio_mapping *gm;
1073 int count = -ENOENT;
1078 /* Try first from _DSD */
1079 for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
1080 if (con_id && strcmp(con_id, "gpios"))
1081 snprintf(propname, sizeof(propname), "%s-%s",
1082 con_id, gpio_suffixes[i]);
1084 snprintf(propname, sizeof(propname), "%s",
1087 ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
1090 if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
1092 else if (obj->type == ACPI_TYPE_PACKAGE)
1093 count = acpi_gpio_package_count(obj);
1094 } else if (adev->driver_gpios) {
1095 for (gm = adev->driver_gpios; gm->name; gm++)
1096 if (strcmp(propname, gm->name) == 0) {
1105 /* Then from plain _CRS GPIOs */
1107 struct list_head resource_list;
1108 unsigned int crs_count = 0;
1110 INIT_LIST_HEAD(&resource_list);
1111 acpi_dev_get_resources(adev, &resource_list,
1112 acpi_find_gpio_count, &crs_count);
1113 acpi_dev_free_resource_list(&resource_list);
1117 return count ? count : -ENOENT;
1120 struct acpi_crs_lookup {
1121 struct list_head node;
1122 struct acpi_device *adev;
1126 static DEFINE_MUTEX(acpi_crs_lookup_lock);
1127 static LIST_HEAD(acpi_crs_lookup_list);
1129 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
1131 struct acpi_crs_lookup *l, *lookup = NULL;
1133 /* Never allow fallback if the device has properties */
1134 if (adev->data.properties || adev->driver_gpios)
1137 mutex_lock(&acpi_crs_lookup_lock);
1139 list_for_each_entry(l, &acpi_crs_lookup_list, node) {
1140 if (l->adev == adev) {
1147 lookup = kmalloc(sizeof(*lookup), GFP_KERNEL);
1149 lookup->adev = adev;
1150 lookup->con_id = kstrdup(con_id, GFP_KERNEL);
1151 list_add_tail(&lookup->node, &acpi_crs_lookup_list);
1155 mutex_unlock(&acpi_crs_lookup_lock);
1158 ((!lookup->con_id && !con_id) ||
1159 (lookup->con_id && con_id &&
1160 strcmp(lookup->con_id, con_id) == 0));