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 * Polarity and triggering are only specified for GpioInt
421 * Note: we expect here:
422 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
423 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
425 if (lookup
->info
.gpioint
) {
426 lookup
->info
.polarity
= agpio
->polarity
;
427 lookup
->info
.triggering
= agpio
->triggering
;
435 static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup
*lookup
,
436 struct acpi_gpio_info
*info
)
438 struct list_head res_list
;
441 INIT_LIST_HEAD(&res_list
);
443 ret
= acpi_dev_get_resources(lookup
->adev
, &res_list
,
444 acpi_populate_gpio_lookup
,
449 acpi_dev_free_resource_list(&res_list
);
455 *info
= lookup
->info
;
456 if (lookup
->active_low
)
457 info
->polarity
= lookup
->active_low
;
462 static int acpi_gpio_property_lookup(struct fwnode_handle
*fwnode
,
463 const char *propname
, int index
,
464 struct acpi_gpio_lookup
*lookup
)
466 struct acpi_reference_args args
;
469 memset(&args
, 0, sizeof(args
));
470 ret
= __acpi_node_get_property_reference(fwnode
, propname
, index
, 3,
473 struct acpi_device
*adev
= to_acpi_device_node(fwnode
);
478 if (!acpi_get_driver_gpio_data(adev
, propname
, index
, &args
))
482 * The property was found and resolved, so need to lookup the GPIO based
485 lookup
->adev
= args
.adev
;
489 lookup
->index
= args
.args
[0];
490 lookup
->pin_index
= args
.args
[1];
491 lookup
->active_low
= !!args
.args
[2];
497 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
498 * @adev: pointer to a ACPI device to get GPIO from
499 * @propname: Property name of the GPIO (optional)
500 * @index: index of GpioIo/GpioInt resource (starting from %0)
501 * @info: info pointer to fill in (optional)
503 * Function goes through ACPI resources for @adev and based on @index looks
504 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
505 * and returns it. @index matches GpioIo/GpioInt resources only so if there
506 * are total %3 GPIO resources, the index goes from %0 to %2.
508 * If @propname is specified the GPIO is looked using device property. In
509 * that case @index is used to select the GPIO entry in the property value
510 * (in case of multiple).
512 * If the GPIO cannot be translated or there is an error an ERR_PTR is
515 * Note: if the GPIO resource has multiple entries in the pin list, this
516 * function only returns the first.
518 static struct gpio_desc
*acpi_get_gpiod_by_index(struct acpi_device
*adev
,
519 const char *propname
, int index
,
520 struct acpi_gpio_info
*info
)
522 struct acpi_gpio_lookup lookup
;
526 return ERR_PTR(-ENODEV
);
528 memset(&lookup
, 0, sizeof(lookup
));
529 lookup
.index
= index
;
532 dev_dbg(&adev
->dev
, "GPIO: looking up %s\n", propname
);
534 ret
= acpi_gpio_property_lookup(acpi_fwnode_handle(adev
),
535 propname
, index
, &lookup
);
539 dev_dbg(&adev
->dev
, "GPIO: _DSD returned %s %d %d %u\n",
540 dev_name(&lookup
.adev
->dev
), lookup
.index
,
541 lookup
.pin_index
, lookup
.active_low
);
543 dev_dbg(&adev
->dev
, "GPIO: looking up %d in _CRS\n", index
);
547 ret
= acpi_gpio_resource_lookup(&lookup
, info
);
548 return ret
? ERR_PTR(ret
) : lookup
.desc
;
551 struct gpio_desc
*acpi_find_gpio(struct device
*dev
,
554 enum gpiod_flags flags
,
555 enum gpio_lookup_flags
*lookupflags
)
557 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
558 struct acpi_gpio_info info
;
559 struct gpio_desc
*desc
;
563 /* Try first from _DSD */
564 for (i
= 0; i
< ARRAY_SIZE(gpio_suffixes
); i
++) {
565 if (con_id
&& strcmp(con_id
, "gpios")) {
566 snprintf(propname
, sizeof(propname
), "%s-%s",
567 con_id
, gpio_suffixes
[i
]);
569 snprintf(propname
, sizeof(propname
), "%s",
573 desc
= acpi_get_gpiod_by_index(adev
, propname
, idx
, &info
);
574 if (!IS_ERR(desc
) || (PTR_ERR(desc
) == -EPROBE_DEFER
))
578 /* Then from plain _CRS GPIOs */
580 if (!acpi_can_fallback_to_crs(adev
, con_id
))
581 return ERR_PTR(-ENOENT
);
583 desc
= acpi_get_gpiod_by_index(adev
, NULL
, idx
, &info
);
587 if ((flags
== GPIOD_OUT_LOW
|| flags
== GPIOD_OUT_HIGH
) &&
589 dev_dbg(dev
, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
590 return ERR_PTR(-ENOENT
);
594 if (info
.polarity
== GPIO_ACTIVE_LOW
)
595 *lookupflags
|= GPIO_ACTIVE_LOW
;
601 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
602 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
603 * @propname: Property name of the GPIO
604 * @index: index of GpioIo/GpioInt resource (starting from %0)
605 * @info: info pointer to fill in (optional)
607 * If @fwnode is an ACPI device object, call %acpi_get_gpiod_by_index() for it.
608 * Otherwise (ie. it is a data-only non-device object), use the property-based
609 * GPIO lookup to get to the GPIO resource with the relevant information and use
610 * that to obtain the GPIO descriptor to return.
612 struct gpio_desc
*acpi_node_get_gpiod(struct fwnode_handle
*fwnode
,
613 const char *propname
, int index
,
614 struct acpi_gpio_info
*info
)
616 struct acpi_gpio_lookup lookup
;
617 struct acpi_device
*adev
;
620 adev
= to_acpi_device_node(fwnode
);
622 return acpi_get_gpiod_by_index(adev
, propname
, index
, info
);
624 if (!is_acpi_data_node(fwnode
))
625 return ERR_PTR(-ENODEV
);
628 return ERR_PTR(-EINVAL
);
630 memset(&lookup
, 0, sizeof(lookup
));
631 lookup
.index
= index
;
633 ret
= acpi_gpio_property_lookup(fwnode
, propname
, index
, &lookup
);
637 ret
= acpi_gpio_resource_lookup(&lookup
, info
);
638 return ret
? ERR_PTR(ret
) : lookup
.desc
;
642 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
643 * @adev: pointer to a ACPI device to get IRQ from
644 * @index: index of GpioInt resource (starting from %0)
646 * If the device has one or more GpioInt resources, this function can be
647 * used to translate from the GPIO offset in the resource to the Linux IRQ
650 * Return: Linux IRQ number (>%0) on success, negative errno on failure.
652 int acpi_dev_gpio_irq_get(struct acpi_device
*adev
, int index
)
655 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
);
667 if (info
.gpioint
&& idx
++ == index
) {
668 int irq
= gpiod_to_irq(desc
);
673 irq_flags
= acpi_dev_get_irq_type(info
.triggering
,
676 /* Set type if specified and different than the current one */
677 if (irq_flags
!= IRQ_TYPE_NONE
&&
678 irq_flags
!= irq_get_trigger_type(irq
))
679 irq_set_irq_type(irq
, irq_flags
);
687 EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get
);
690 acpi_gpio_adr_space_handler(u32 function
, acpi_physical_address address
,
691 u32 bits
, u64
*value
, void *handler_context
,
692 void *region_context
)
694 struct acpi_gpio_chip
*achip
= region_context
;
695 struct gpio_chip
*chip
= achip
->chip
;
696 struct acpi_resource_gpio
*agpio
;
697 struct acpi_resource
*ares
;
698 int pin_index
= (int)address
;
704 status
= acpi_buffer_to_resource(achip
->conn_info
.connection
,
705 achip
->conn_info
.length
, &ares
);
706 if (ACPI_FAILURE(status
))
709 if (WARN_ON(ares
->type
!= ACPI_RESOURCE_TYPE_GPIO
)) {
711 return AE_BAD_PARAMETER
;
714 agpio
= &ares
->data
.gpio
;
715 pull_up
= agpio
->pin_config
== ACPI_PIN_CONFIG_PULLUP
;
717 if (WARN_ON(agpio
->io_restriction
== ACPI_IO_RESTRICT_INPUT
&&
718 function
== ACPI_WRITE
)) {
720 return AE_BAD_PARAMETER
;
723 length
= min(agpio
->pin_table_length
, (u16
)(pin_index
+ bits
));
724 for (i
= pin_index
; i
< length
; ++i
) {
725 int pin
= agpio
->pin_table
[i
];
726 struct acpi_gpio_connection
*conn
;
727 struct gpio_desc
*desc
;
730 pin
= acpi_gpiochip_pin_to_gpio_offset(chip
->gpiodev
, pin
);
732 status
= AE_BAD_PARAMETER
;
736 mutex_lock(&achip
->conn_lock
);
739 list_for_each_entry(conn
, &achip
->conns
, node
) {
740 if (conn
->pin
== pin
) {
748 * The same GPIO can be shared between operation region and
749 * event but only if the access here is ACPI_READ. In that
750 * case we "borrow" the event GPIO instead.
752 if (!found
&& agpio
->sharable
== ACPI_SHARED
&&
753 function
== ACPI_READ
) {
754 struct acpi_gpio_event
*event
;
756 list_for_each_entry(event
, &achip
->events
, node
) {
757 if (event
->pin
== pin
) {
766 desc
= gpiochip_request_own_desc(chip
, pin
,
770 mutex_unlock(&achip
->conn_lock
);
774 switch (agpio
->io_restriction
) {
775 case ACPI_IO_RESTRICT_INPUT
:
776 gpiod_direction_input(desc
);
778 case ACPI_IO_RESTRICT_OUTPUT
:
780 * ACPI GPIO resources don't contain an
781 * initial value for the GPIO. Therefore we
782 * deduce that value from the pull field
783 * instead. If the pin is pulled up we
784 * assume default to be high, otherwise
787 gpiod_direction_output(desc
, pull_up
);
791 * Assume that the BIOS has configured the
792 * direction and pull accordingly.
797 conn
= kzalloc(sizeof(*conn
), GFP_KERNEL
);
799 status
= AE_NO_MEMORY
;
800 gpiochip_free_own_desc(desc
);
801 mutex_unlock(&achip
->conn_lock
);
807 list_add_tail(&conn
->node
, &achip
->conns
);
810 mutex_unlock(&achip
->conn_lock
);
812 if (function
== ACPI_WRITE
)
813 gpiod_set_raw_value_cansleep(desc
,
814 !!((1 << i
) & *value
));
816 *value
|= (u64
)gpiod_get_raw_value_cansleep(desc
) << i
;
824 static void acpi_gpiochip_request_regions(struct acpi_gpio_chip
*achip
)
826 struct gpio_chip
*chip
= achip
->chip
;
827 acpi_handle handle
= ACPI_HANDLE(chip
->parent
);
830 INIT_LIST_HEAD(&achip
->conns
);
831 mutex_init(&achip
->conn_lock
);
832 status
= acpi_install_address_space_handler(handle
, ACPI_ADR_SPACE_GPIO
,
833 acpi_gpio_adr_space_handler
,
835 if (ACPI_FAILURE(status
))
836 dev_err(chip
->parent
,
837 "Failed to install GPIO OpRegion handler\n");
840 static void acpi_gpiochip_free_regions(struct acpi_gpio_chip
*achip
)
842 struct gpio_chip
*chip
= achip
->chip
;
843 acpi_handle handle
= ACPI_HANDLE(chip
->parent
);
844 struct acpi_gpio_connection
*conn
, *tmp
;
847 status
= acpi_remove_address_space_handler(handle
, ACPI_ADR_SPACE_GPIO
,
848 acpi_gpio_adr_space_handler
);
849 if (ACPI_FAILURE(status
)) {
850 dev_err(chip
->parent
,
851 "Failed to remove GPIO OpRegion handler\n");
855 list_for_each_entry_safe_reverse(conn
, tmp
, &achip
->conns
, node
) {
856 gpiochip_free_own_desc(conn
->desc
);
857 list_del(&conn
->node
);
862 static struct gpio_desc
*acpi_gpiochip_parse_own_gpio(
863 struct acpi_gpio_chip
*achip
, struct fwnode_handle
*fwnode
,
864 const char **name
, unsigned int *lflags
, unsigned int *dflags
)
866 struct gpio_chip
*chip
= achip
->chip
;
867 struct gpio_desc
*desc
;
875 ret
= fwnode_property_read_u32_array(fwnode
, "gpios", gpios
,
880 ret
= acpi_gpiochip_pin_to_gpio_offset(chip
->gpiodev
, gpios
[0]);
884 desc
= gpiochip_get_desc(chip
, ret
);
889 *lflags
|= GPIO_ACTIVE_LOW
;
891 if (fwnode_property_present(fwnode
, "input"))
893 else if (fwnode_property_present(fwnode
, "output-low"))
894 *dflags
|= GPIOD_OUT_LOW
;
895 else if (fwnode_property_present(fwnode
, "output-high"))
896 *dflags
|= GPIOD_OUT_HIGH
;
898 return ERR_PTR(-EINVAL
);
900 fwnode_property_read_string(fwnode
, "line-name", name
);
905 static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip
*achip
)
907 struct gpio_chip
*chip
= achip
->chip
;
908 struct fwnode_handle
*fwnode
;
910 device_for_each_child_node(chip
->parent
, fwnode
) {
911 unsigned int lflags
, dflags
;
912 struct gpio_desc
*desc
;
916 if (!fwnode_property_present(fwnode
, "gpio-hog"))
919 desc
= acpi_gpiochip_parse_own_gpio(achip
, fwnode
, &name
,
924 ret
= gpiod_hog(desc
, name
, lflags
, dflags
);
926 dev_err(chip
->parent
, "Failed to hog GPIO\n");
927 fwnode_handle_put(fwnode
);
933 void acpi_gpiochip_add(struct gpio_chip
*chip
)
935 struct acpi_gpio_chip
*acpi_gpio
;
939 if (!chip
|| !chip
->parent
)
942 handle
= ACPI_HANDLE(chip
->parent
);
946 acpi_gpio
= kzalloc(sizeof(*acpi_gpio
), GFP_KERNEL
);
948 dev_err(chip
->parent
,
949 "Failed to allocate memory for ACPI GPIO chip\n");
953 acpi_gpio
->chip
= chip
;
954 INIT_LIST_HEAD(&acpi_gpio
->events
);
956 status
= acpi_attach_data(handle
, acpi_gpio_chip_dh
, acpi_gpio
);
957 if (ACPI_FAILURE(status
)) {
958 dev_err(chip
->parent
, "Failed to attach ACPI GPIO chip\n");
964 devprop_gpiochip_set_names(chip
);
966 acpi_gpiochip_request_regions(acpi_gpio
);
967 acpi_gpiochip_scan_gpios(acpi_gpio
);
968 acpi_walk_dep_device_list(handle
);
971 void acpi_gpiochip_remove(struct gpio_chip
*chip
)
973 struct acpi_gpio_chip
*acpi_gpio
;
977 if (!chip
|| !chip
->parent
)
980 handle
= ACPI_HANDLE(chip
->parent
);
984 status
= acpi_get_data(handle
, acpi_gpio_chip_dh
, (void **)&acpi_gpio
);
985 if (ACPI_FAILURE(status
)) {
986 dev_warn(chip
->parent
, "Failed to retrieve ACPI GPIO chip\n");
990 acpi_gpiochip_free_regions(acpi_gpio
);
992 acpi_detach_data(handle
, acpi_gpio_chip_dh
);
996 static int acpi_gpio_package_count(const union acpi_object
*obj
)
998 const union acpi_object
*element
= obj
->package
.elements
;
999 const union acpi_object
*end
= element
+ obj
->package
.count
;
1000 unsigned int count
= 0;
1002 while (element
< end
) {
1003 switch (element
->type
) {
1004 case ACPI_TYPE_LOCAL_REFERENCE
:
1007 case ACPI_TYPE_INTEGER
:
1020 static int acpi_find_gpio_count(struct acpi_resource
*ares
, void *data
)
1022 unsigned int *count
= data
;
1024 if (ares
->type
== ACPI_RESOURCE_TYPE_GPIO
)
1025 *count
+= ares
->data
.gpio
.pin_table_length
;
1031 * acpi_gpio_count - return the number of GPIOs associated with a
1032 * device / function or -ENOENT if no GPIO has been
1033 * assigned to the requested function.
1034 * @dev: GPIO consumer, can be NULL for system-global GPIOs
1035 * @con_id: function within the GPIO consumer
1037 int acpi_gpio_count(struct device
*dev
, const char *con_id
)
1039 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1040 const union acpi_object
*obj
;
1041 const struct acpi_gpio_mapping
*gm
;
1042 int count
= -ENOENT
;
1047 /* Try first from _DSD */
1048 for (i
= 0; i
< ARRAY_SIZE(gpio_suffixes
); i
++) {
1049 if (con_id
&& strcmp(con_id
, "gpios"))
1050 snprintf(propname
, sizeof(propname
), "%s-%s",
1051 con_id
, gpio_suffixes
[i
]);
1053 snprintf(propname
, sizeof(propname
), "%s",
1056 ret
= acpi_dev_get_property(adev
, propname
, ACPI_TYPE_ANY
,
1059 if (obj
->type
== ACPI_TYPE_LOCAL_REFERENCE
)
1061 else if (obj
->type
== ACPI_TYPE_PACKAGE
)
1062 count
= acpi_gpio_package_count(obj
);
1063 } else if (adev
->driver_gpios
) {
1064 for (gm
= adev
->driver_gpios
; gm
->name
; gm
++)
1065 if (strcmp(propname
, gm
->name
) == 0) {
1074 /* Then from plain _CRS GPIOs */
1076 struct list_head resource_list
;
1077 unsigned int crs_count
= 0;
1079 INIT_LIST_HEAD(&resource_list
);
1080 acpi_dev_get_resources(adev
, &resource_list
,
1081 acpi_find_gpio_count
, &crs_count
);
1082 acpi_dev_free_resource_list(&resource_list
);
1089 struct acpi_crs_lookup
{
1090 struct list_head node
;
1091 struct acpi_device
*adev
;
1095 static DEFINE_MUTEX(acpi_crs_lookup_lock
);
1096 static LIST_HEAD(acpi_crs_lookup_list
);
1098 bool acpi_can_fallback_to_crs(struct acpi_device
*adev
, const char *con_id
)
1100 struct acpi_crs_lookup
*l
, *lookup
= NULL
;
1102 /* Never allow fallback if the device has properties */
1103 if (adev
->data
.properties
|| adev
->driver_gpios
)
1106 mutex_lock(&acpi_crs_lookup_lock
);
1108 list_for_each_entry(l
, &acpi_crs_lookup_list
, node
) {
1109 if (l
->adev
== adev
) {
1116 lookup
= kmalloc(sizeof(*lookup
), GFP_KERNEL
);
1118 lookup
->adev
= adev
;
1119 lookup
->con_id
= kstrdup(con_id
, GFP_KERNEL
);
1120 list_add_tail(&lookup
->node
, &acpi_crs_lookup_list
);
1124 mutex_unlock(&acpi_crs_lookup_lock
);
1127 ((!lookup
->con_id
&& !con_id
) ||
1128 (lookup
->con_id
&& con_id
&&
1129 strcmp(lookup
->con_id
, con_id
) == 0));