[deliverable/linux.git] / drivers / gpio / gpiolib-acpi.c

/*
 * ACPI helpers for GPIO API
 *
 * Copyright (C) 2012, Intel Corporation
 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>

#include "gpiolib.h"

struct acpi_gpio_event {
	struct list_head node;
	acpi_handle handle;
	unsigned int pin;
	unsigned int irq;
};

struct acpi_gpio_chip {
	struct gpio_chip *chip;
	struct list_head events;
};

static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
{
	if (!gc->dev)
		return false;

	return ACPI_HANDLE(gc->dev) == data;
}

/**
 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
 * @path:	ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
 * @pin:	ACPI GPIO pin number (0-based, controller-relative)
 *
 * Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
 * error value
 */

static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
{
	struct gpio_chip *chip;
	acpi_handle handle;
	acpi_status status;

	status = acpi_get_handle(NULL, path, &handle);
	if (ACPI_FAILURE(status))
		return ERR_PTR(-ENODEV);

	chip = gpiochip_find(handle, acpi_gpiochip_find);
	if (!chip)
		return ERR_PTR(-ENODEV);

	if (pin < 0 || pin > chip->ngpio)
		return ERR_PTR(-EINVAL);

	return gpiochip_get_desc(chip, pin);
}

static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
{
	acpi_handle handle = data;

	acpi_evaluate_object(handle, NULL, NULL, NULL);

	return IRQ_HANDLED;
}

static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
{
	struct acpi_gpio_event *event = data;

	acpi_execute_simple_method(event->handle, NULL, event->pin);

	return IRQ_HANDLED;
}

static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
{
	/* The address of this function is used as a key. */
}

/**
 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
 * @acpi_gpio:      ACPI GPIO chip
 *
 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
 * handled by ACPI event methods which need to be called from the GPIO
 * chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
 * gpio pins have acpi event methods and assigns interrupt handlers that calls
 * the acpi event methods for those pins.
 */
static void acpi_gpiochip_request_interrupts(struct acpi_gpio_chip *acpi_gpio)
{
	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
	struct gpio_chip *chip = acpi_gpio->chip;
	struct acpi_resource *res;
	acpi_handle handle, evt_handle;
	acpi_status status;
	unsigned int pin;
	int irq, ret;
	char ev_name[5];

	if (!chip->dev || !chip->to_irq)
		return;

	handle = ACPI_HANDLE(chip->dev);
	if (!handle)
		return;

	INIT_LIST_HEAD(&acpi_gpio->events);

	/*
	 * If a GPIO interrupt has an ACPI event handler method, or _EVT is
	 * present, set up an interrupt handler that calls the ACPI event
	 * handler.
	 */
	for (res = buf.pointer;
	     res && (res->type != ACPI_RESOURCE_TYPE_END_TAG);
	     res = ACPI_NEXT_RESOURCE(res)) {
		irq_handler_t handler = NULL;
		void *data;

		if (res->type != ACPI_RESOURCE_TYPE_GPIO ||
		    res->data.gpio.connection_type !=
		    ACPI_RESOURCE_GPIO_TYPE_INT)
			continue;

		pin = res->data.gpio.pin_table[0];
		if (pin > chip->ngpio)
			continue;

		irq = chip->to_irq(chip, pin);
		if (irq < 0)
			continue;

		if (pin <= 255) {
			acpi_handle ev_handle;

			sprintf(ev_name, "_%c%02X",
				res->data.gpio.triggering ? 'E' : 'L', pin);
			status = acpi_get_handle(handle, ev_name, &ev_handle);
			if (ACPI_SUCCESS(status)) {
				handler = acpi_gpio_irq_handler;
				data = ev_handle;
			}
		}
		if (!handler) {
			struct acpi_gpio_event *event;

			status = acpi_get_handle(handle, "_EVT", &evt_handle);
			if (ACPI_FAILURE(status))
				continue

			event = kzalloc(sizeof(*event), GFP_KERNEL);
			if (!event)
				continue;

			list_add_tail(&event->node, &acpi_gpio->events);
			event->handle = evt_handle;
			event->pin = pin;
			event->irq = irq;
			handler = acpi_gpio_irq_handler_evt;
			data = event;
		}
		if (!handler)
			continue;

		/* Assume BIOS sets the triggering, so no flags */
		ret = devm_request_threaded_irq(chip->dev, irq, NULL, handler,
						0, "GPIO-signaled-ACPI-event",
						data);
		if (ret)
			dev_err(chip->dev,
				"Failed to request IRQ %d ACPI event handler\n",
				irq);
	}
}

/**
 * acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
 * @acpi_gpio:      ACPI GPIO chip
 *
 * Free interrupts associated with the _EVT method for the given GPIO chip.
 *
 * The remaining ACPI event interrupts associated with the chip are freed
 * automatically.
 */
static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio)
{
	struct acpi_gpio_event *event, *ep;
	struct gpio_chip *chip = acpi_gpio->chip;

	if (!chip->dev || !chip->to_irq)
		return;

	list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
		devm_free_irq(chip->dev, event->irq, event);
		list_del(&event->node);
		kfree(event);
	}
}

struct acpi_gpio_lookup {
	struct acpi_gpio_info info;
	int index;
	struct gpio_desc *desc;
	int n;
};

static int acpi_find_gpio(struct acpi_resource *ares, void *data)
{
	struct acpi_gpio_lookup *lookup = data;

	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
		return 1;

	if (lookup->n++ == lookup->index && !lookup->desc) {
		const struct acpi_resource_gpio *agpio = &ares->data.gpio;

		lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
					      agpio->pin_table[0]);
		lookup->info.gpioint =
			agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
		lookup->info.active_low =
			agpio->polarity == ACPI_ACTIVE_LOW;
	}

	return 1;
}

/**
 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
 * @dev: pointer to a device to get GPIO from
 * @index: index of GpioIo/GpioInt resource (starting from %0)
 * @info: info pointer to fill in (optional)
 *
 * Function goes through ACPI resources for @dev and based on @index looks
 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
 * and returns it. @index matches GpioIo/GpioInt resources only so if there
 * are total %3 GPIO resources, the index goes from %0 to %2.
 *
 * If the GPIO cannot be translated or there is an error an ERR_PTR is
 * returned.
 *
 * Note: if the GPIO resource has multiple entries in the pin list, this
 * function only returns the first.
 */
struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
					  struct acpi_gpio_info *info)
{
	struct acpi_gpio_lookup lookup;
	struct list_head resource_list;
	struct acpi_device *adev;
	acpi_handle handle;
	int ret;

	if (!dev)
		return ERR_PTR(-EINVAL);

	handle = ACPI_HANDLE(dev);
	if (!handle || acpi_bus_get_device(handle, &adev))
		return ERR_PTR(-ENODEV);

	memset(&lookup, 0, sizeof(lookup));
	lookup.index = index;

	INIT_LIST_HEAD(&resource_list);
	ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio,
				     &lookup);
	if (ret < 0)
		return ERR_PTR(ret);

	acpi_dev_free_resource_list(&resource_list);

	if (lookup.desc && info)
		*info = lookup.info;

	return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
}

void acpi_gpiochip_add(struct gpio_chip *chip)
{
	struct acpi_gpio_chip *acpi_gpio;
	acpi_handle handle;
	acpi_status status;

	handle = ACPI_HANDLE(chip->dev);
	if (!handle)
		return;

	acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
	if (!acpi_gpio) {
		dev_err(chip->dev,
			"Failed to allocate memory for ACPI GPIO chip\n");
		return;
	}

	acpi_gpio->chip = chip;

	status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
	if (ACPI_FAILURE(status)) {
		dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n");
		kfree(acpi_gpio);
		return;
	}

	acpi_gpiochip_request_interrupts(acpi_gpio);
}

void acpi_gpiochip_remove(struct gpio_chip *chip)
{
	struct acpi_gpio_chip *acpi_gpio;
	acpi_handle handle;
	acpi_status status;

	handle = ACPI_HANDLE(chip->dev);
	if (!handle)
		return;

	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
	if (ACPI_FAILURE(status)) {
		dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n");
		return;
	}

	acpi_gpiochip_free_interrupts(acpi_gpio);

	acpi_detach_data(handle, acpi_gpio_chip_dh);
	kfree(acpi_gpio);
}
Commit	Line	Data
e29482e8 MN	1	/*
	2	* ACPI helpers for GPIO API
	3	*
	4	* Copyright (C) 2012, Intel Corporation
	5	* Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
	6	* Mika Westerberg <mika.westerberg@linux.intel.com>
	7	*
	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.
	11	*/
	12
	13	#include <linux/errno.h>
936e15dd	14	#include <linux/gpio/consumer.h>
5ccff852	15	#include <linux/gpio/driver.h>
e29482e8	16	#include <linux/export.h>
e29482e8	17	#include <linux/acpi.h>
0d1c28a4	18	#include <linux/interrupt.h>
e29482e8	19
5ccff852 MW	20	#include "gpiolib.h"
5ccff852 MW	21
4b01a14b	22	struct acpi_gpio_event {
7fc7acb9	23	struct list_head node;
4b01a14b	24	acpi_handle handle;
7fc7acb9 RW	25	unsigned int pin;
	26	unsigned int irq;
	27	};
	28
aa92b6f6 MW	29	struct acpi_gpio_chip {
aa92b6f6 MW	30	struct gpio_chip *chip;
4b01a14b	31	struct list_head events;
aa92b6f6 MW	32	};
aa92b6f6 MW	33
e29482e8 MN	34	static int acpi_gpiochip_find(struct gpio_chip gc, void data)
	35	{
	36	if (!gc->dev)
	37	return false;
	38
	39	return ACPI_HANDLE(gc->dev) == data;
	40	}
	41
	42	/**
936e15dd	43	* acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
e29482e8 MN	44	* @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
	45	* @pin: ACPI GPIO pin number (0-based, controller-relative)
	46	*
936e15dd MW	47	* Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
936e15dd MW	48	* error value
e29482e8 MN	49	*/
e29482e8 MN	50
936e15dd	51	static struct gpio_desc acpi_get_gpiod(char path, int pin)
e29482e8 MN	52	{
	53	struct gpio_chip *chip;
	54	acpi_handle handle;
	55	acpi_status status;
	56
	57	status = acpi_get_handle(NULL, path, &handle);
	58	if (ACPI_FAILURE(status))
936e15dd	59	return ERR_PTR(-ENODEV);
e29482e8 MN	60
	61	chip = gpiochip_find(handle, acpi_gpiochip_find);
	62	if (!chip)
936e15dd	63	return ERR_PTR(-ENODEV);
e29482e8	64
936e15dd MW	65	if (pin < 0 \|\| pin > chip->ngpio)
936e15dd MW	66	return ERR_PTR(-EINVAL);
e29482e8	67
390d82e3	68	return gpiochip_get_desc(chip, pin);
e29482e8	69	}
0d1c28a4	70
0d1c28a4 MN	71	static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
	72	{
	73	acpi_handle handle = data;
	74
	75	acpi_evaluate_object(handle, NULL, NULL, NULL);
	76
	77	return IRQ_HANDLED;
	78	}
	79
7fc7acb9 RW	80	static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
7fc7acb9 RW	81	{
4b01a14b	82	struct acpi_gpio_event *event = data;
7fc7acb9	83
4b01a14b	84	acpi_execute_simple_method(event->handle, NULL, event->pin);
7fc7acb9 RW	85
	86	return IRQ_HANDLED;
	87	}
	88
aa92b6f6	89	static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
7fc7acb9 RW	90	{
	91	/* The address of this function is used as a key. */
	92	}
	93
0d1c28a4 MN	94	/**
0d1c28a4 MN	95	* acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
aa92b6f6	96	* @acpi_gpio: ACPI GPIO chip
0d1c28a4 MN	97	*
	98	* ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
	99	* handled by ACPI event methods which need to be called from the GPIO
	100	* chip's interrupt handler. acpi_gpiochip_request_interrupts finds out which
	101	* gpio pins have acpi event methods and assigns interrupt handlers that calls
	102	* the acpi event methods for those pins.
0d1c28a4	103	*/
aa92b6f6	104	static void acpi_gpiochip_request_interrupts(struct acpi_gpio_chip *acpi_gpio)
0d1c28a4 MN	105	{
0d1c28a4 MN	106	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
aa92b6f6	107	struct gpio_chip *chip = acpi_gpio->chip;
0d1c28a4	108	struct acpi_resource *res;
7fc7acb9	109	acpi_handle handle, evt_handle;
0d1c28a4	110	acpi_status status;
1107ca10 MN	111	unsigned int pin;
1107ca10 MN	112	int irq, ret;
0d1c28a4 MN	113	char ev_name[5];
	114
	115	if (!chip->dev \|\| !chip->to_irq)
	116	return;
	117
	118	handle = ACPI_HANDLE(chip->dev);
	119	if (!handle)
	120	return;
	121
4b01a14b	122	INIT_LIST_HEAD(&acpi_gpio->events);
0d1c28a4	123
7fc7acb9 RW	124	/*
	125	* If a GPIO interrupt has an ACPI event handler method, or _EVT is
	126	* present, set up an interrupt handler that calls the ACPI event
	127	* handler.
	128	*/
0d1c28a4 MN	129	for (res = buf.pointer;
	130	res && (res->type != ACPI_RESOURCE_TYPE_END_TAG);
	131	res = ACPI_NEXT_RESOURCE(res)) {
7fc7acb9 RW	132	irq_handler_t handler = NULL;
7fc7acb9 RW	133	void *data;
0d1c28a4 MN	134
	135	if (res->type != ACPI_RESOURCE_TYPE_GPIO \|\|
	136	res->data.gpio.connection_type !=
	137	ACPI_RESOURCE_GPIO_TYPE_INT)
	138	continue;
	139
	140	pin = res->data.gpio.pin_table[0];
	141	if (pin > chip->ngpio)
	142	continue;
	143
0d1c28a4 MN	144	irq = chip->to_irq(chip, pin);
	145	if (irq < 0)
	146	continue;
	147
7fc7acb9 RW	148	if (pin <= 255) {
	149	acpi_handle ev_handle;
	150
	151	sprintf(ev_name, "_%c%02X",
	152	res->data.gpio.triggering ? 'E' : 'L', pin);
	153	status = acpi_get_handle(handle, ev_name, &ev_handle);
	154	if (ACPI_SUCCESS(status)) {
	155	handler = acpi_gpio_irq_handler;
	156	data = ev_handle;
	157	}
	158	}
aa92b6f6	159	if (!handler) {
4b01a14b	160	struct acpi_gpio_event *event;
7fc7acb9	161
aa92b6f6 MW	162	status = acpi_get_handle(handle, "_EVT", &evt_handle);
	163	if (ACPI_FAILURE(status))
	164	continue
	165
4b01a14b MW	166	event = kzalloc(sizeof(*event), GFP_KERNEL);
4b01a14b MW	167	if (!event)
7fc7acb9 RW	168	continue;
7fc7acb9 RW	169
4b01a14b MW	170	list_add_tail(&event->node, &acpi_gpio->events);
	171	event->handle = evt_handle;
	172	event->pin = pin;
	173	event->irq = irq;
7fc7acb9	174	handler = acpi_gpio_irq_handler_evt;
4b01a14b	175	data = event;
7fc7acb9 RW	176	}
	177	if (!handler)
	178	continue;
	179
0d1c28a4	180	/* Assume BIOS sets the triggering, so no flags */
7fc7acb9 RW	181	ret = devm_request_threaded_irq(chip->dev, irq, NULL, handler,
	182	0, "GPIO-signaled-ACPI-event",
	183	data);
1107ca10 MN	184	if (ret)
	185	dev_err(chip->dev,
	186	"Failed to request IRQ %d ACPI event handler\n",
	187	irq);
0d1c28a4 MN	188	}
0d1c28a4 MN	189	}
7fc7acb9	190
70b53411 MW	191	/**
70b53411 MW	192	* acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
aa92b6f6	193	* @acpi_gpio: ACPI GPIO chip
70b53411 MW	194	*
	195	* Free interrupts associated with the _EVT method for the given GPIO chip.
	196	*
	197	* The remaining ACPI event interrupts associated with the chip are freed
	198	* automatically.
	199	*/
aa92b6f6	200	static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio)
70b53411	201	{
4b01a14b	202	struct acpi_gpio_event event, ep;
aa92b6f6	203	struct gpio_chip *chip = acpi_gpio->chip;
70b53411 MW	204
	205	if (!chip->dev \|\| !chip->to_irq)
	206	return;
	207
4b01a14b MW	208	list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
	209	devm_free_irq(chip->dev, event->irq, event);
	210	list_del(&event->node);
	211	kfree(event);
70b53411	212	}
70b53411	213	}
70b53411	214
12028d2d MW	215	struct acpi_gpio_lookup {
	216	struct acpi_gpio_info info;
	217	int index;
936e15dd	218	struct gpio_desc *desc;
12028d2d MW	219	int n;
	220	};
	221
	222	static int acpi_find_gpio(struct acpi_resource ares, void data)
	223	{
	224	struct acpi_gpio_lookup *lookup = data;
	225
	226	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
	227	return 1;
	228
936e15dd	229	if (lookup->n++ == lookup->index && !lookup->desc) {
12028d2d MW	230	const struct acpi_resource_gpio *agpio = &ares->data.gpio;
12028d2d MW	231
936e15dd MW	232	lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
936e15dd MW	233	agpio->pin_table[0]);
12028d2d MW	234	lookup->info.gpioint =
12028d2d MW	235	agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
e01f440a MW	236	lookup->info.active_low =
e01f440a MW	237	agpio->polarity == ACPI_ACTIVE_LOW;
12028d2d MW	238	}
	239
	240	return 1;
	241	}
	242
	243	/**
936e15dd	244	* acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
12028d2d MW	245	* @dev: pointer to a device to get GPIO from
	246	* @index: index of GpioIo/GpioInt resource (starting from %0)
	247	* @info: info pointer to fill in (optional)
	248	*
	249	* Function goes through ACPI resources for @dev and based on @index looks
936e15dd	250	* up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
12028d2d MW	251	* and returns it. @index matches GpioIo/GpioInt resources only so if there
	252	* are total %3 GPIO resources, the index goes from %0 to %2.
	253	*
936e15dd	254	* If the GPIO cannot be translated or there is an error an ERR_PTR is
12028d2d MW	255	* returned.
	256	*
	257	* Note: if the GPIO resource has multiple entries in the pin list, this
	258	* function only returns the first.
	259	*/
936e15dd MW	260	struct gpio_desc acpi_get_gpiod_by_index(struct device dev, int index,
936e15dd MW	261	struct acpi_gpio_info *info)
12028d2d MW	262	{
	263	struct acpi_gpio_lookup lookup;
	264	struct list_head resource_list;
	265	struct acpi_device *adev;
	266	acpi_handle handle;
	267	int ret;
	268
	269	if (!dev)
936e15dd	270	return ERR_PTR(-EINVAL);
12028d2d MW	271
	272	handle = ACPI_HANDLE(dev);
	273	if (!handle \|\| acpi_bus_get_device(handle, &adev))
936e15dd	274	return ERR_PTR(-ENODEV);
12028d2d MW	275
	276	memset(&lookup, 0, sizeof(lookup));
	277	lookup.index = index;
12028d2d MW	278
	279	INIT_LIST_HEAD(&resource_list);
	280	ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio,
	281	&lookup);
	282	if (ret < 0)
936e15dd	283	return ERR_PTR(ret);
12028d2d MW	284
	285	acpi_dev_free_resource_list(&resource_list);
	286
936e15dd	287	if (lookup.desc && info)
12028d2d MW	288	*info = lookup.info;
12028d2d MW	289
a00580c2	290	return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
12028d2d	291	}
664e3e5a MW	292
	293	void acpi_gpiochip_add(struct gpio_chip *chip)
	294	{
aa92b6f6 MW	295	struct acpi_gpio_chip *acpi_gpio;
	296	acpi_handle handle;
	297	acpi_status status;
	298
	299	handle = ACPI_HANDLE(chip->dev);
	300	if (!handle)
	301	return;
	302
	303	acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
	304	if (!acpi_gpio) {
	305	dev_err(chip->dev,
	306	"Failed to allocate memory for ACPI GPIO chip\n");
	307	return;
	308	}
	309
	310	acpi_gpio->chip = chip;
	311
	312	status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
	313	if (ACPI_FAILURE(status)) {
	314	dev_err(chip->dev, "Failed to attach ACPI GPIO chip\n");
	315	kfree(acpi_gpio);
	316	return;
	317	}
	318
	319	acpi_gpiochip_request_interrupts(acpi_gpio);
664e3e5a MW	320	}
	321
	322	void acpi_gpiochip_remove(struct gpio_chip *chip)
	323	{
aa92b6f6 MW	324	struct acpi_gpio_chip *acpi_gpio;
	325	acpi_handle handle;
	326	acpi_status status;
	327
	328	handle = ACPI_HANDLE(chip->dev);
	329	if (!handle)
	330	return;
	331
	332	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
	333	if (ACPI_FAILURE(status)) {
	334	dev_warn(chip->dev, "Failed to retrieve ACPI GPIO chip\n");
	335	return;
	336	}
	337
	338	acpi_gpiochip_free_interrupts(acpi_gpio);
	339
	340	acpi_detach_data(handle, acpi_gpio_chip_dh);
	341	kfree(acpi_gpio);
664e3e5a	342	}