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));