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/export.h>
18 #include <linux/acpi.h>
19 #include <linux/interrupt.h>
20 #include <linux/mutex.h>
21 #include <linux/pinctrl/pinctrl.h>
25 struct acpi_gpio_event
{
26 struct list_head node
;
30 struct gpio_desc
*desc
;
33 struct acpi_gpio_connection
{
34 struct list_head node
;
36 struct gpio_desc
*desc
;
39 struct acpi_gpio_chip
{
41 * ACPICA requires that the first field of the context parameter
42 * passed to acpi_install_address_space_handler() is large enough
43 * to hold struct acpi_connection_info.
45 struct acpi_connection_info conn_info
;
46 struct list_head conns
;
47 struct mutex conn_lock
;
48 struct gpio_chip
*chip
;
49 struct list_head events
;
52 static int acpi_gpiochip_find(struct gpio_chip
*gc
, void *data
)
57 return ACPI_HANDLE(gc
->dev
) == data
;
62 * acpi_gpiochip_pin_to_gpio_offset() - translates ACPI GPIO to Linux GPIO
64 * @pin: ACPI GPIO pin number from GpioIo/GpioInt resource
66 * Function takes ACPI GpioIo/GpioInt pin number as a parameter and
67 * translates it to a corresponding offset suitable to be passed to a
68 * GPIO controller driver.
70 * Typically the returned offset is same as @pin, but if the GPIO
71 * controller uses pin controller and the mapping is not contiguous the
72 * offset might be different.
74 static int acpi_gpiochip_pin_to_gpio_offset(struct gpio_chip
*chip
, int pin
)
76 struct gpio_pin_range
*pin_range
;
78 /* If there are no ranges in this chip, use 1:1 mapping */
79 if (list_empty(&chip
->pin_ranges
))
82 list_for_each_entry(pin_range
, &chip
->pin_ranges
, node
) {
83 const struct pinctrl_gpio_range
*range
= &pin_range
->range
;
87 for (i
= 0; i
< range
->npins
; i
++) {
88 if (range
->pins
[i
] == pin
)
89 return range
->base
+ i
- chip
->base
;
92 if (pin
>= range
->pin_base
&&
93 pin
< range
->pin_base
+ range
->npins
) {
96 gpio_base
= range
->base
- chip
->base
;
97 return gpio_base
+ pin
- range
->pin_base
;
105 static inline int acpi_gpiochip_pin_to_gpio_offset(struct gpio_chip
*chip
,
113 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
114 * @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
115 * @pin: ACPI GPIO pin number (0-based, controller-relative)
117 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
118 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
119 * controller does not have gpiochip registered at the moment. This is to
120 * support probe deferral.
122 static struct gpio_desc
*acpi_get_gpiod(char *path
, int pin
)
124 struct gpio_chip
*chip
;
129 status
= acpi_get_handle(NULL
, path
, &handle
);
130 if (ACPI_FAILURE(status
))
131 return ERR_PTR(-ENODEV
);
133 chip
= gpiochip_find(handle
, acpi_gpiochip_find
);
135 return ERR_PTR(-EPROBE_DEFER
);
137 offset
= acpi_gpiochip_pin_to_gpio_offset(chip
, pin
);
139 return ERR_PTR(offset
);
141 return gpiochip_get_desc(chip
, offset
);
144 static irqreturn_t
acpi_gpio_irq_handler(int irq
, void *data
)
146 struct acpi_gpio_event
*event
= data
;
148 acpi_evaluate_object(event
->handle
, NULL
, NULL
, NULL
);
153 static irqreturn_t
acpi_gpio_irq_handler_evt(int irq
, void *data
)
155 struct acpi_gpio_event
*event
= data
;
157 acpi_execute_simple_method(event
->handle
, NULL
, event
->pin
);
162 static void acpi_gpio_chip_dh(acpi_handle handle
, void *data
)
164 /* The address of this function is used as a key. */
167 static acpi_status
acpi_gpiochip_request_interrupt(struct acpi_resource
*ares
,
170 struct acpi_gpio_chip
*acpi_gpio
= context
;
171 struct gpio_chip
*chip
= acpi_gpio
->chip
;
172 struct acpi_resource_gpio
*agpio
;
173 acpi_handle handle
, evt_handle
;
174 struct acpi_gpio_event
*event
;
175 irq_handler_t handler
= NULL
;
176 struct gpio_desc
*desc
;
177 unsigned long irqflags
;
180 if (ares
->type
!= ACPI_RESOURCE_TYPE_GPIO
)
183 agpio
= &ares
->data
.gpio
;
184 if (agpio
->connection_type
!= ACPI_RESOURCE_GPIO_TYPE_INT
)
187 handle
= ACPI_HANDLE(chip
->dev
);
188 pin
= agpio
->pin_table
[0];
192 sprintf(ev_name
, "_%c%02X",
193 agpio
->triggering
== ACPI_EDGE_SENSITIVE
? 'E' : 'L',
195 if (ACPI_SUCCESS(acpi_get_handle(handle
, ev_name
, &evt_handle
)))
196 handler
= acpi_gpio_irq_handler
;
199 if (ACPI_SUCCESS(acpi_get_handle(handle
, "_EVT", &evt_handle
)))
200 handler
= acpi_gpio_irq_handler_evt
;
203 return AE_BAD_PARAMETER
;
205 pin
= acpi_gpiochip_pin_to_gpio_offset(chip
, pin
);
207 return AE_BAD_PARAMETER
;
209 desc
= gpiochip_request_own_desc(chip
, pin
, "ACPI:Event");
211 dev_err(chip
->dev
, "Failed to request GPIO\n");
215 gpiod_direction_input(desc
);
217 ret
= gpiochip_lock_as_irq(chip
, pin
);
219 dev_err(chip
->dev
, "Failed to lock GPIO as interrupt\n");
223 irq
= gpiod_to_irq(desc
);
225 dev_err(chip
->dev
, "Failed to translate GPIO to IRQ\n");
226 goto fail_unlock_irq
;
229 irqflags
= IRQF_ONESHOT
;
230 if (agpio
->triggering
== ACPI_LEVEL_SENSITIVE
) {
231 if (agpio
->polarity
== ACPI_ACTIVE_HIGH
)
232 irqflags
|= IRQF_TRIGGER_HIGH
;
234 irqflags
|= IRQF_TRIGGER_LOW
;
236 switch (agpio
->polarity
) {
237 case ACPI_ACTIVE_HIGH
:
238 irqflags
|= IRQF_TRIGGER_RISING
;
240 case ACPI_ACTIVE_LOW
:
241 irqflags
|= IRQF_TRIGGER_FALLING
;
244 irqflags
|= IRQF_TRIGGER_RISING
|
245 IRQF_TRIGGER_FALLING
;
250 event
= kzalloc(sizeof(*event
), GFP_KERNEL
);
252 goto fail_unlock_irq
;
254 event
->handle
= evt_handle
;
259 ret
= request_threaded_irq(event
->irq
, NULL
, handler
, irqflags
,
260 "ACPI:Event", event
);
262 dev_err(chip
->dev
, "Failed to setup interrupt handler for %d\n",
264 goto fail_free_event
;
267 list_add_tail(&event
->node
, &acpi_gpio
->events
);
273 gpiochip_unlock_as_irq(chip
, pin
);
275 gpiochip_free_own_desc(desc
);
281 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
284 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
285 * handled by ACPI event methods which need to be called from the GPIO
286 * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
287 * gpio pins have acpi event methods and assigns interrupt handlers that calls
288 * the acpi event methods for those pins.
290 void acpi_gpiochip_request_interrupts(struct gpio_chip
*chip
)
292 struct acpi_gpio_chip
*acpi_gpio
;
296 if (!chip
->dev
|| !chip
->to_irq
)
299 handle
= ACPI_HANDLE(chip
->dev
);
303 status
= acpi_get_data(handle
, acpi_gpio_chip_dh
, (void **)&acpi_gpio
);
304 if (ACPI_FAILURE(status
))
307 acpi_walk_resources(handle
, "_AEI",
308 acpi_gpiochip_request_interrupt
, acpi_gpio
);
310 EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts
);
313 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
316 * Free interrupts associated with GPIO ACPI event method for the given
319 void acpi_gpiochip_free_interrupts(struct gpio_chip
*chip
)
321 struct acpi_gpio_chip
*acpi_gpio
;
322 struct acpi_gpio_event
*event
, *ep
;
326 if (!chip
->dev
|| !chip
->to_irq
)
329 handle
= ACPI_HANDLE(chip
->dev
);
333 status
= acpi_get_data(handle
, acpi_gpio_chip_dh
, (void **)&acpi_gpio
);
334 if (ACPI_FAILURE(status
))
337 list_for_each_entry_safe_reverse(event
, ep
, &acpi_gpio
->events
, node
) {
338 struct gpio_desc
*desc
;
340 free_irq(event
->irq
, event
);
342 if (WARN_ON(IS_ERR(desc
)))
344 gpiochip_unlock_as_irq(chip
, event
->pin
);
345 gpiochip_free_own_desc(desc
);
346 list_del(&event
->node
);
350 EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts
);
352 int acpi_dev_add_driver_gpios(struct acpi_device
*adev
,
353 const struct acpi_gpio_mapping
*gpios
)
356 adev
->driver_gpios
= gpios
;
361 EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios
);
363 static bool acpi_get_driver_gpio_data(struct acpi_device
*adev
,
364 const char *name
, int index
,
365 struct acpi_reference_args
*args
)
367 const struct acpi_gpio_mapping
*gm
;
369 if (!adev
->driver_gpios
)
372 for (gm
= adev
->driver_gpios
; gm
->name
; gm
++)
373 if (!strcmp(name
, gm
->name
) && gm
->data
&& index
< gm
->size
) {
374 const struct acpi_gpio_params
*par
= gm
->data
+ index
;
377 args
->args
[0] = par
->crs_entry_index
;
378 args
->args
[1] = par
->line_index
;
379 args
->args
[2] = par
->active_low
;
387 struct acpi_gpio_lookup
{
388 struct acpi_gpio_info info
;
392 struct acpi_device
*adev
;
393 struct gpio_desc
*desc
;
397 static int acpi_find_gpio(struct acpi_resource
*ares
, void *data
)
399 struct acpi_gpio_lookup
*lookup
= data
;
401 if (ares
->type
!= ACPI_RESOURCE_TYPE_GPIO
)
404 if (lookup
->n
++ == lookup
->index
&& !lookup
->desc
) {
405 const struct acpi_resource_gpio
*agpio
= &ares
->data
.gpio
;
406 int pin_index
= lookup
->pin_index
;
408 if (pin_index
>= agpio
->pin_table_length
)
411 lookup
->desc
= acpi_get_gpiod(agpio
->resource_source
.string_ptr
,
412 agpio
->pin_table
[pin_index
]);
413 lookup
->info
.gpioint
=
414 agpio
->connection_type
== ACPI_RESOURCE_GPIO_TYPE_INT
;
417 * ActiveLow is only specified for GpioInt resource. If
418 * GpioIo is used then the only way to set the flag is
419 * to use _DSD "gpios" property.
420 * Note: we expect here:
421 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
422 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
424 if (lookup
->info
.gpioint
) {
425 lookup
->info
.polarity
= agpio
->polarity
;
426 lookup
->info
.triggering
= agpio
->triggering
;
434 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup
*lookup
,
435 struct acpi_gpio_info
*info
)
437 struct list_head res_list
;
440 INIT_LIST_HEAD(&res_list
);
442 ret
= acpi_dev_get_resources(lookup
->adev
, &res_list
, acpi_find_gpio
,
447 acpi_dev_free_resource_list(&res_list
);
453 *info
= lookup
->info
;
454 if (lookup
->active_low
)
455 info
->polarity
= lookup
->active_low
;
460 static int acpi_gpio_property_lookup(struct fwnode_handle
*fwnode
,
461 const char *propname
, int index
,
462 struct acpi_gpio_lookup
*lookup
)
464 struct acpi_reference_args args
;
467 memset(&args
, 0, sizeof(args
));
468 ret
= acpi_node_get_property_reference(fwnode
, propname
, index
, &args
);
470 struct acpi_device
*adev
= to_acpi_device_node(fwnode
);
475 if (!acpi_get_driver_gpio_data(adev
, propname
, index
, &args
))
479 * The property was found and resolved, so need to lookup the GPIO based
482 lookup
->adev
= args
.adev
;
483 if (args
.nargs
>= 2) {
484 lookup
->index
= args
.args
[0];
485 lookup
->pin_index
= args
.args
[1];
486 /* 3rd argument, if present is used to specify active_low. */
488 lookup
->active_low
= !!args
.args
[2];
494 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
495 * @adev: pointer to a ACPI device to get GPIO from
496 * @propname: Property name of the GPIO (optional)
497 * @index: index of GpioIo/GpioInt resource (starting from %0)
498 * @info: info pointer to fill in (optional)
500 * Function goes through ACPI resources for @adev and based on @index looks
501 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
502 * and returns it. @index matches GpioIo/GpioInt resources only so if there
503 * are total %3 GPIO resources, the index goes from %0 to %2.
505 * If @propname is specified the GPIO is looked using device property. In
506 * that case @index is used to select the GPIO entry in the property value
507 * (in case of multiple).
509 * If the GPIO cannot be translated or there is an error an ERR_PTR is
512 * Note: if the GPIO resource has multiple entries in the pin list, this
513 * function only returns the first.
515 struct gpio_desc
*acpi_get_gpiod_by_index(struct acpi_device
*adev
,
516 const char *propname
, int index
,
517 struct acpi_gpio_info
*info
)
519 struct acpi_gpio_lookup lookup
;
523 return ERR_PTR(-ENODEV
);
525 memset(&lookup
, 0, sizeof(lookup
));
526 lookup
.index
= index
;
529 dev_dbg(&adev
->dev
, "GPIO: looking up %s\n", propname
);
531 ret
= acpi_gpio_property_lookup(acpi_fwnode_handle(adev
),
532 propname
, index
, &lookup
);
536 dev_dbg(&adev
->dev
, "GPIO: _DSD returned %s %d %d %u\n",
537 dev_name(&lookup
.adev
->dev
), lookup
.index
,
538 lookup
.pin_index
, lookup
.active_low
);
540 dev_dbg(&adev
->dev
, "GPIO: looking up %d in _CRS\n", index
);
544 ret
= acpi_gpio_resource_lookup(&lookup
, info
);
545 return ret
? ERR_PTR(ret
) : lookup
.desc
;
549 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
550 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
551 * @propname: Property name of the GPIO
552 * @index: index of GpioIo/GpioInt resource (starting from %0)
553 * @info: info pointer to fill in (optional)
555 * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
556 * Otherwise (ie. it is a data-only non-device object), use the property-based
557 * GPIO lookup to get to the GPIO resource with the relevant information and use
558 * that to obtain the GPIO descriptor to return.
560 struct gpio_desc
*acpi_node_get_gpiod(struct fwnode_handle
*fwnode
,
561 const char *propname
, int index
,
562 struct acpi_gpio_info
*info
)
564 struct acpi_gpio_lookup lookup
;
565 struct acpi_device
*adev
;
568 adev
= to_acpi_device_node(fwnode
);
570 return acpi_get_gpiod_by_index(adev
, propname
, index
, info
);
572 if (!is_acpi_data_node(fwnode
))
573 return ERR_PTR(-ENODEV
);
576 return ERR_PTR(-EINVAL
);
578 memset(&lookup
, 0, sizeof(lookup
));
579 lookup
.index
= index
;
581 ret
= acpi_gpio_property_lookup(fwnode
, propname
, index
, &lookup
);
585 ret
= acpi_gpio_resource_lookup(&lookup
, info
);
586 return ret
? ERR_PTR(ret
) : lookup
.desc
;
590 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
591 * @adev: pointer to a ACPI device to get IRQ from
592 * @index: index of GpioInt resource (starting from %0)
594 * If the device has one or more GpioInt resources, this function can be
595 * used to translate from the GPIO offset in the resource to the Linux IRQ
598 * Return: Linux IRQ number (>%0) on success, negative errno on failure.
600 int acpi_dev_gpio_irq_get(struct acpi_device
*adev
, int index
)
603 unsigned int irq_flags
;
605 for (i
= 0, idx
= 0; idx
<= index
; i
++) {
606 struct acpi_gpio_info info
;
607 struct gpio_desc
*desc
;
609 desc
= acpi_get_gpiod_by_index(adev
, NULL
, i
, &info
);
612 if (info
.gpioint
&& idx
++ == index
) {
613 int irq
= gpiod_to_irq(desc
);
618 irq_flags
= acpi_dev_get_irq_type(info
.triggering
,
621 /* Set type if specified and different than the current one */
622 if (irq_flags
!= IRQ_TYPE_NONE
&&
623 irq_flags
!= irq_get_trigger_type(irq
))
624 irq_set_irq_type(irq
, irq_flags
);
632 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get
);
635 acpi_gpio_adr_space_handler(u32 function
, acpi_physical_address address
,
636 u32 bits
, u64
*value
, void *handler_context
,
637 void *region_context
)
639 struct acpi_gpio_chip
*achip
= region_context
;
640 struct gpio_chip
*chip
= achip
->chip
;
641 struct acpi_resource_gpio
*agpio
;
642 struct acpi_resource
*ares
;
643 int pin_index
= (int)address
;
649 status
= acpi_buffer_to_resource(achip
->conn_info
.connection
,
650 achip
->conn_info
.length
, &ares
);
651 if (ACPI_FAILURE(status
))
654 if (WARN_ON(ares
->type
!= ACPI_RESOURCE_TYPE_GPIO
)) {
656 return AE_BAD_PARAMETER
;
659 agpio
= &ares
->data
.gpio
;
660 pull_up
= agpio
->pin_config
== ACPI_PIN_CONFIG_PULLUP
;
662 if (WARN_ON(agpio
->io_restriction
== ACPI_IO_RESTRICT_INPUT
&&
663 function
== ACPI_WRITE
)) {
665 return AE_BAD_PARAMETER
;
668 length
= min(agpio
->pin_table_length
, (u16
)(pin_index
+ bits
));
669 for (i
= pin_index
; i
< length
; ++i
) {
670 int pin
= agpio
->pin_table
[i
];
671 struct acpi_gpio_connection
*conn
;
672 struct gpio_desc
*desc
;
675 pin
= acpi_gpiochip_pin_to_gpio_offset(chip
, pin
);
677 status
= AE_BAD_PARAMETER
;
681 mutex_lock(&achip
->conn_lock
);
684 list_for_each_entry(conn
, &achip
->conns
, node
) {
685 if (conn
->pin
== pin
) {
693 * The same GPIO can be shared between operation region and
694 * event but only if the access here is ACPI_READ. In that
695 * case we "borrow" the event GPIO instead.
697 if (!found
&& agpio
->sharable
== ACPI_SHARED
&&
698 function
== ACPI_READ
) {
699 struct acpi_gpio_event
*event
;
701 list_for_each_entry(event
, &achip
->events
, node
) {
702 if (event
->pin
== pin
) {
711 desc
= gpiochip_request_own_desc(chip
, pin
,
715 mutex_unlock(&achip
->conn_lock
);
719 switch (agpio
->io_restriction
) {
720 case ACPI_IO_RESTRICT_INPUT
:
721 gpiod_direction_input(desc
);
723 case ACPI_IO_RESTRICT_OUTPUT
:
725 * ACPI GPIO resources don't contain an
726 * initial value for the GPIO. Therefore we
727 * deduce that value from the pull field
728 * instead. If the pin is pulled up we
729 * assume default to be high, otherwise
732 gpiod_direction_output(desc
, pull_up
);
736 * Assume that the BIOS has configured the
737 * direction and pull accordingly.
742 conn
= kzalloc(sizeof(*conn
), GFP_KERNEL
);
744 status
= AE_NO_MEMORY
;
745 gpiochip_free_own_desc(desc
);
746 mutex_unlock(&achip
->conn_lock
);
752 list_add_tail(&conn
->node
, &achip
->conns
);
755 mutex_unlock(&achip
->conn_lock
);
757 if (function
== ACPI_WRITE
)
758 gpiod_set_raw_value_cansleep(desc
,
759 !!((1 << i
) & *value
));
761 *value
|= (u64
)gpiod_get_raw_value_cansleep(desc
) << i
;
769 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip
*achip
)
771 struct gpio_chip
*chip
= achip
->chip
;
772 acpi_handle handle
= ACPI_HANDLE(chip
->dev
);
775 INIT_LIST_HEAD(&achip
->conns
);
776 mutex_init(&achip
->conn_lock
);
777 status
= acpi_install_address_space_handler(handle
, ACPI_ADR_SPACE_GPIO
,
778 acpi_gpio_adr_space_handler
,
780 if (ACPI_FAILURE(status
))
781 dev_err(chip
->dev
, "Failed to install GPIO OpRegion handler\n");
784 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip
*achip
)
786 struct gpio_chip
*chip
= achip
->chip
;
787 acpi_handle handle
= ACPI_HANDLE(chip
->dev
);
788 struct acpi_gpio_connection
*conn
, *tmp
;
791 status
= acpi_remove_address_space_handler(handle
, ACPI_ADR_SPACE_GPIO
,
792 acpi_gpio_adr_space_handler
);
793 if (ACPI_FAILURE(status
)) {
794 dev_err(chip
->dev
, "Failed to remove GPIO OpRegion handler\n");
798 list_for_each_entry_safe_reverse(conn
, tmp
, &achip
->conns
, node
) {
799 gpiochip_free_own_desc(conn
->desc
);
800 list_del(&conn
->node
);
805 void acpi_gpiochip_add(struct gpio_chip
*chip
)
807 struct acpi_gpio_chip
*acpi_gpio
;
811 if (!chip
|| !chip
->dev
)
814 handle
= ACPI_HANDLE(chip
->dev
);
818 acpi_gpio
= kzalloc(sizeof(*acpi_gpio
), GFP_KERNEL
);
821 "Failed to allocate memory for ACPI GPIO chip\n");
825 acpi_gpio
->chip
= chip
;
826 INIT_LIST_HEAD(&acpi_gpio
->events
);
828 status
= acpi_attach_data(handle
, acpi_gpio_chip_dh
, acpi_gpio
);
829 if (ACPI_FAILURE(status
)) {
830 dev_err(chip
->dev
, "Failed to attach ACPI GPIO chip\n");
835 acpi_gpiochip_request_regions(acpi_gpio
);
838 void acpi_gpiochip_remove(struct gpio_chip
*chip
)
840 struct acpi_gpio_chip
*acpi_gpio
;
844 if (!chip
|| !chip
->dev
)
847 handle
= ACPI_HANDLE(chip
->dev
);
851 status
= acpi_get_data(handle
, acpi_gpio_chip_dh
, (void **)&acpi_gpio
);
852 if (ACPI_FAILURE(status
)) {
853 dev_warn(chip
->dev
, "Failed to retrieve ACPI GPIO chip\n");
857 acpi_gpiochip_free_regions(acpi_gpio
);
859 acpi_detach_data(handle
, acpi_gpio_chip_dh
);
863 static unsigned int acpi_gpio_package_count(const union acpi_object
*obj
)
865 const union acpi_object
*element
= obj
->package
.elements
;
866 const union acpi_object
*end
= element
+ obj
->package
.count
;
867 unsigned int count
= 0;
869 while (element
< end
) {
870 if (element
->type
== ACPI_TYPE_LOCAL_REFERENCE
)
878 static int acpi_find_gpio_count(struct acpi_resource
*ares
, void *data
)
880 unsigned int *count
= data
;
882 if (ares
->type
== ACPI_RESOURCE_TYPE_GPIO
)
883 *count
+= ares
->data
.gpio
.pin_table_length
;
889 * acpi_gpio_count - return the number of GPIOs associated with a
890 * device / function or -ENOENT if no GPIO has been
891 * assigned to the requested function.
892 * @dev: GPIO consumer, can be NULL for system-global GPIOs
893 * @con_id: function within the GPIO consumer
895 int acpi_gpio_count(struct device
*dev
, const char *con_id
)
897 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
898 const union acpi_object
*obj
;
899 const struct acpi_gpio_mapping
*gm
;
905 /* Try first from _DSD */
906 for (i
= 0; i
< ARRAY_SIZE(gpio_suffixes
); i
++) {
907 if (con_id
&& strcmp(con_id
, "gpios"))
908 snprintf(propname
, sizeof(propname
), "%s-%s",
909 con_id
, gpio_suffixes
[i
]);
911 snprintf(propname
, sizeof(propname
), "%s",
914 ret
= acpi_dev_get_property(adev
, propname
, ACPI_TYPE_ANY
,
917 if (obj
->type
== ACPI_TYPE_LOCAL_REFERENCE
)
919 else if (obj
->type
== ACPI_TYPE_PACKAGE
)
920 count
= acpi_gpio_package_count(obj
);
921 } else if (adev
->driver_gpios
) {
922 for (gm
= adev
->driver_gpios
; gm
->name
; gm
++)
923 if (strcmp(propname
, gm
->name
) == 0) {
932 /* Then from plain _CRS GPIOs */
934 struct list_head resource_list
;
935 unsigned int crs_count
= 0;
937 INIT_LIST_HEAD(&resource_list
);
938 acpi_dev_get_resources(adev
, &resource_list
,
939 acpi_find_gpio_count
, &crs_count
);
940 acpi_dev_free_resource_list(&resource_list
);
947 struct acpi_crs_lookup
{
948 struct list_head node
;
949 struct acpi_device
*adev
;
953 static DEFINE_MUTEX(acpi_crs_lookup_lock
);
954 static LIST_HEAD(acpi_crs_lookup_list
);
956 bool acpi_can_fallback_to_crs(struct acpi_device
*adev
, const char *con_id
)
958 struct acpi_crs_lookup
*l
, *lookup
= NULL
;
960 /* Never allow fallback if the device has properties */
961 if (adev
->data
.properties
|| adev
->driver_gpios
)
964 mutex_lock(&acpi_crs_lookup_lock
);
966 list_for_each_entry(l
, &acpi_crs_lookup_list
, node
) {
967 if (l
->adev
== adev
) {
974 lookup
= kmalloc(sizeof(*lookup
), GFP_KERNEL
);
977 lookup
->con_id
= con_id
;
978 list_add_tail(&lookup
->node
, &acpi_crs_lookup_list
);
982 mutex_unlock(&acpi_crs_lookup_lock
);
985 ((!lookup
->con_id
&& !con_id
) ||
986 (lookup
->con_id
&& con_id
&&
987 strcmp(lookup
->con_id
, con_id
) == 0));