[deliverable/linux.git] / drivers / mmc / core / slot-gpio.c

/*
 * Generic GPIO card-detect helper
 *
 * Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * 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/err.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/mmc/host.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/module.h>
#include <linux/slab.h>

struct mmc_gpio {
	struct gpio_desc *ro_gpio;
	struct gpio_desc *cd_gpio;
	bool override_ro_active_level;
	bool override_cd_active_level;
	char *ro_label;
	char cd_label[0];
};

static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
{
	/* Schedule a card detection after a debounce timeout */
	struct mmc_host *host = dev_id;

	host->trigger_card_event = true;
	mmc_detect_change(host, msecs_to_jiffies(200));

	return IRQ_HANDLED;
}

static int mmc_gpio_alloc(struct mmc_host *host)
{
	size_t len = strlen(dev_name(host->parent)) + 4;
	struct mmc_gpio *ctx;

	mutex_lock(&host->slot.lock);

	ctx = host->slot.handler_priv;
	if (!ctx) {
		/*
		 * devm_kzalloc() can be called after device_initialize(), even
		 * before device_add(), i.e., between mmc_alloc_host() and
		 * mmc_add_host()
		 */
		ctx = devm_kzalloc(&host->class_dev, sizeof(*ctx) + 2 * len,
				   GFP_KERNEL);
		if (ctx) {
			ctx->ro_label = ctx->cd_label + len;
			snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
			snprintf(ctx->ro_label, len, "%s ro", dev_name(host->parent));
			host->slot.handler_priv = ctx;
		}
	}

	mutex_unlock(&host->slot.lock);

	return ctx ? 0 : -ENOMEM;
}

int mmc_gpio_get_ro(struct mmc_host *host)
{
	struct mmc_gpio *ctx = host->slot.handler_priv;

	if (!ctx || !ctx->ro_gpio)
		return -ENOSYS;

	if (ctx->override_ro_active_level)
		return !gpiod_get_raw_value_cansleep(ctx->ro_gpio) ^
			!!(host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);

	return gpiod_get_value_cansleep(ctx->ro_gpio);
}
EXPORT_SYMBOL(mmc_gpio_get_ro);

int mmc_gpio_get_cd(struct mmc_host *host)
{
	struct mmc_gpio *ctx = host->slot.handler_priv;

	if (!ctx || !ctx->cd_gpio)
		return -ENOSYS;

	if (ctx->override_cd_active_level)
		return !gpiod_get_raw_value_cansleep(ctx->cd_gpio) ^
			!!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);

	return gpiod_get_value_cansleep(ctx->cd_gpio);
}
EXPORT_SYMBOL(mmc_gpio_get_cd);

/**
 * mmc_gpio_request_ro - request a gpio for write-protection
 * @host: mmc host
 * @gpio: gpio number requested
 *
 * As devm_* managed functions are used in mmc_gpio_request_ro(), client
 * drivers do not need to explicitly call mmc_gpio_free_ro() for freeing up,
 * if the requesting and freeing are only needed at probing and unbinding time
 * for once.  However, if client drivers do something special like runtime
 * switching for write-protection, they are responsible for calling
 * mmc_gpio_request_ro() and mmc_gpio_free_ro() as a pair on their own.
 *
 * Returns zero on success, else an error.
 */
int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
{
	struct mmc_gpio *ctx;
	int ret;

	if (!gpio_is_valid(gpio))
		return -EINVAL;

	ret = mmc_gpio_alloc(host);
	if (ret < 0)
		return ret;

	ctx = host->slot.handler_priv;

	ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
				    ctx->ro_label);
	if (ret < 0)
		return ret;

	ctx->override_ro_active_level = true;
	ctx->ro_gpio = gpio_to_desc(gpio);

	return 0;
}
EXPORT_SYMBOL(mmc_gpio_request_ro);

void mmc_gpiod_request_cd_irq(struct mmc_host *host)
{
	struct mmc_gpio *ctx = host->slot.handler_priv;
	int ret, irq;

	if (host->slot.cd_irq >= 0 || !ctx || !ctx->cd_gpio)
		return;

	irq = gpiod_to_irq(ctx->cd_gpio);

	/*
	 * Even if gpiod_to_irq() returns a valid IRQ number, the platform might
	 * still prefer to poll, e.g., because that IRQ number is already used
	 * by another unit and cannot be shared.
	 */
	if (irq >= 0 && host->caps & MMC_CAP_NEEDS_POLL)
		irq = -EINVAL;

	if (irq >= 0) {
		ret = devm_request_threaded_irq(&host->class_dev, irq,
			NULL, mmc_gpio_cd_irqt,
			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
			ctx->cd_label, host);
		if (ret < 0)
			irq = ret;
	}

	host->slot.cd_irq = irq;

	if (irq < 0)
		host->caps |= MMC_CAP_NEEDS_POLL;
}
EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);

/**
 * mmc_gpio_request_cd - request a gpio for card-detection
 * @host: mmc host
 * @gpio: gpio number requested
 * @debounce: debounce time in microseconds
 *
 * As devm_* managed functions are used in mmc_gpio_request_cd(), client
 * drivers do not need to explicitly call mmc_gpio_free_cd() for freeing up,
 * if the requesting and freeing are only needed at probing and unbinding time
 * for once.  However, if client drivers do something special like runtime
 * switching for card-detection, they are responsible for calling
 * mmc_gpio_request_cd() and mmc_gpio_free_cd() as a pair on their own.
 *
 * If GPIO debouncing is desired, set the debounce parameter to a non-zero
 * value. The caller is responsible for ensuring that the GPIO driver associated
 * with the GPIO supports debouncing, otherwise an error will be returned.
 *
 * Returns zero on success, else an error.
 */
int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
			unsigned int debounce)
{
	struct mmc_gpio *ctx;
	int ret;

	ret = mmc_gpio_alloc(host);
	if (ret < 0)
		return ret;

	ctx = host->slot.handler_priv;

	ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
				    ctx->cd_label);
	if (ret < 0)
		/*
		 * don't bother freeing memory. It might still get used by other
		 * slot functions, in any case it will be freed, when the device
		 * is destroyed.
		 */
		return ret;

	if (debounce) {
		ret = gpio_set_debounce(gpio, debounce);
		if (ret < 0)
			return ret;
	}

	ctx->override_cd_active_level = true;
	ctx->cd_gpio = gpio_to_desc(gpio);

	mmc_gpiod_request_cd_irq(host);

	return 0;
}
EXPORT_SYMBOL(mmc_gpio_request_cd);

/**
 * mmc_gpio_free_ro - free the write-protection gpio
 * @host: mmc host
 *
 * It's provided only for cases that client drivers need to manually free
 * up the write-protection gpio requested by mmc_gpio_request_ro().
 */
void mmc_gpio_free_ro(struct mmc_host *host)
{
	struct mmc_gpio *ctx = host->slot.handler_priv;
	int gpio;

	if (!ctx || !ctx->ro_gpio)
		return;

	gpio = desc_to_gpio(ctx->ro_gpio);
	ctx->ro_gpio = NULL;

	devm_gpio_free(&host->class_dev, gpio);
}
EXPORT_SYMBOL(mmc_gpio_free_ro);

/**
 * mmc_gpio_free_cd - free the card-detection gpio
 * @host: mmc host
 *
 * It's provided only for cases that client drivers need to manually free
 * up the card-detection gpio requested by mmc_gpio_request_cd().
 */
void mmc_gpio_free_cd(struct mmc_host *host)
{
	struct mmc_gpio *ctx = host->slot.handler_priv;
	int gpio;

	if (!ctx || !ctx->cd_gpio)
		return;

	if (host->slot.cd_irq >= 0) {
		devm_free_irq(&host->class_dev, host->slot.cd_irq, host);
		host->slot.cd_irq = -EINVAL;
	}

	gpio = desc_to_gpio(ctx->cd_gpio);
	ctx->cd_gpio = NULL;

	devm_gpio_free(&host->class_dev, gpio);
}
EXPORT_SYMBOL(mmc_gpio_free_cd);

/**
 * mmc_gpiod_request_cd - request a gpio descriptor for card-detection
 * @host: mmc host
 * @con_id: function within the GPIO consumer
 * @idx: index of the GPIO to obtain in the consumer
 * @override_active_level: ignore %GPIO_ACTIVE_LOW flag
 * @debounce: debounce time in microseconds
 *
 * Use this function in place of mmc_gpio_request_cd() to use the GPIO
 * descriptor API.  Note that it is paired with mmc_gpiod_free_cd() not
 * mmc_gpio_free_cd().  Note also that it must be called prior to mmc_add_host()
 * otherwise the caller must also call mmc_gpiod_request_cd_irq().
 *
 * Returns zero on success, else an error.
 */
int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
			 unsigned int idx, bool override_active_level,
			 unsigned int debounce)
{
	struct mmc_gpio *ctx;
	struct gpio_desc *desc;
	int ret;

	ret = mmc_gpio_alloc(host);
	if (ret < 0)
		return ret;

	ctx = host->slot.handler_priv;

	if (!con_id)
		con_id = ctx->cd_label;

	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
	if (IS_ERR(desc))
		return PTR_ERR(desc);

	if (debounce) {
		ret = gpiod_set_debounce(desc, debounce);
		if (ret < 0)
			return ret;
	}

	ctx->override_cd_active_level = override_active_level;
	ctx->cd_gpio = desc;

	return 0;
}
EXPORT_SYMBOL(mmc_gpiod_request_cd);

/**
 * mmc_gpiod_request_ro - request a gpio descriptor for write protection
 * @host: mmc host
 * @con_id: function within the GPIO consumer
 * @idx: index of the GPIO to obtain in the consumer
 * @override_active_level: ignore %GPIO_ACTIVE_LOW flag
 * @debounce: debounce time in microseconds
 *
 * Use this function in place of mmc_gpio_request_ro() to use the GPIO
 * descriptor API.  Note that it is paired with mmc_gpiod_free_ro() not
 * mmc_gpio_free_ro().
 *
 * Returns zero on success, else an error.
 */
int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
			 unsigned int idx, bool override_active_level,
			 unsigned int debounce)
{
	struct mmc_gpio *ctx;
	struct gpio_desc *desc;
	int ret;

	ret = mmc_gpio_alloc(host);
	if (ret < 0)
		return ret;

	ctx = host->slot.handler_priv;

	if (!con_id)
		con_id = ctx->ro_label;

	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
	if (IS_ERR(desc))
		return PTR_ERR(desc);

	if (debounce) {
		ret = gpiod_set_debounce(desc, debounce);
		if (ret < 0)
			return ret;
	}

	ctx->override_ro_active_level = override_active_level;
	ctx->ro_gpio = desc;

	return 0;
}
EXPORT_SYMBOL(mmc_gpiod_request_ro);

/**
 * mmc_gpiod_free_cd - free the card-detection gpio descriptor
 * @host: mmc host
 *
 * It's provided only for cases that client drivers need to manually free
 * up the card-detection gpio requested by mmc_gpiod_request_cd().
 */
void mmc_gpiod_free_cd(struct mmc_host *host)
{
	struct mmc_gpio *ctx = host->slot.handler_priv;

	if (!ctx || !ctx->cd_gpio)
		return;

	if (host->slot.cd_irq >= 0) {
		devm_free_irq(&host->class_dev, host->slot.cd_irq, host);
		host->slot.cd_irq = -EINVAL;
	}

	devm_gpiod_put(&host->class_dev, ctx->cd_gpio);

	ctx->cd_gpio = NULL;
}
EXPORT_SYMBOL(mmc_gpiod_free_cd);
Commit	Line	Data
349ab524 GL	1	/*
	2	* Generic GPIO card-detect helper
	3	*
	4	* Copyright (C) 2011, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/err.h>
	12	#include <linux/gpio.h>
842f4bdd	13	#include <linux/gpio/consumer.h>
349ab524 GL	14	#include <linux/interrupt.h>
	15	#include <linux/jiffies.h>
	16	#include <linux/mmc/host.h>
fd0ea65d	17	#include <linux/mmc/slot-gpio.h>
349ab524 GL	18	#include <linux/module.h>
	19	#include <linux/slab.h>
	20
fd0ea65d	21	struct mmc_gpio {
842f4bdd AH	22	struct gpio_desc *ro_gpio;
	23	struct gpio_desc *cd_gpio;
	24	bool override_ro_active_level;
	25	bool override_cd_active_level;
5aa7dad3	26	char *ro_label;
fd0ea65d	27	char cd_label[0];
349ab524 GL	28	};
349ab524 GL	29
fd0ea65d	30	static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
349ab524 GL	31	{
349ab524 GL	32	/* Schedule a card detection after a debounce timeout */
451c8957 GL	33	struct mmc_host *host = dev_id;
451c8957 GL	34
fa372a51	35	host->trigger_card_event = true;
451c8957 GL	36	mmc_detect_change(host, msecs_to_jiffies(200));
451c8957 GL	37
349ab524 GL	38	return IRQ_HANDLED;
	39	}
	40
a7d1a1eb GL	41	static int mmc_gpio_alloc(struct mmc_host *host)
	42	{
	43	size_t len = strlen(dev_name(host->parent)) + 4;
	44	struct mmc_gpio *ctx;
	45
	46	mutex_lock(&host->slot.lock);
	47
	48	ctx = host->slot.handler_priv;
	49	if (!ctx) {
	50	/*
	51	* devm_kzalloc() can be called after device_initialize(), even
	52	* before device_add(), i.e., between mmc_alloc_host() and
	53	* mmc_add_host()
	54	*/
5aa7dad3	55	ctx = devm_kzalloc(&host->class_dev, sizeof(ctx) + 2 len,
a7d1a1eb GL	56	GFP_KERNEL);
a7d1a1eb GL	57	if (ctx) {
5aa7dad3	58	ctx->ro_label = ctx->cd_label + len;
a7d1a1eb	59	snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
5aa7dad3	60	snprintf(ctx->ro_label, len, "%s ro", dev_name(host->parent));
a7d1a1eb GL	61	host->slot.handler_priv = ctx;
	62	}
	63	}
	64
	65	mutex_unlock(&host->slot.lock);
	66
	67	return ctx ? 0 : -ENOMEM;
	68	}
	69
5aa7dad3 GL	70	int mmc_gpio_get_ro(struct mmc_host *host)
	71	{
	72	struct mmc_gpio *ctx = host->slot.handler_priv;
	73
842f4bdd	74	if (!ctx \|\| !ctx->ro_gpio)
5aa7dad3 GL	75	return -ENOSYS;
5aa7dad3 GL	76
842f4bdd AH	77	if (ctx->override_ro_active_level)
	78	return !gpiod_get_raw_value_cansleep(ctx->ro_gpio) ^
	79	!!(host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);
	80
	81	return gpiod_get_value_cansleep(ctx->ro_gpio);
5aa7dad3 GL	82	}
	83	EXPORT_SYMBOL(mmc_gpio_get_ro);
	84
befe4048 GL	85	int mmc_gpio_get_cd(struct mmc_host *host)
	86	{
	87	struct mmc_gpio *ctx = host->slot.handler_priv;
	88
842f4bdd	89	if (!ctx \|\| !ctx->cd_gpio)
befe4048 GL	90	return -ENOSYS;
befe4048 GL	91
842f4bdd AH	92	if (ctx->override_cd_active_level)
	93	return !gpiod_get_raw_value_cansleep(ctx->cd_gpio) ^
	94	!!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
	95
	96	return gpiod_get_value_cansleep(ctx->cd_gpio);
befe4048 GL	97	}
	98	EXPORT_SYMBOL(mmc_gpio_get_cd);
	99
d65b5ae8 SG	100	/**
	101	* mmc_gpio_request_ro - request a gpio for write-protection
	102	* @host: mmc host
	103	* @gpio: gpio number requested
	104	*
	105	* As devm_* managed functions are used in mmc_gpio_request_ro(), client
	106	* drivers do not need to explicitly call mmc_gpio_free_ro() for freeing up,
	107	* if the requesting and freeing are only needed at probing and unbinding time
	108	* for once. However, if client drivers do something special like runtime
	109	* switching for write-protection, they are responsible for calling
	110	* mmc_gpio_request_ro() and mmc_gpio_free_ro() as a pair on their own.
	111	*
	112	* Returns zero on success, else an error.
	113	*/
5aa7dad3 GL	114	int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
	115	{
	116	struct mmc_gpio *ctx;
	117	int ret;
	118
	119	if (!gpio_is_valid(gpio))
	120	return -EINVAL;
	121
	122	ret = mmc_gpio_alloc(host);
	123	if (ret < 0)
	124	return ret;
	125
	126	ctx = host->slot.handler_priv;
	127
d65b5ae8 SG	128	ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
d65b5ae8 SG	129	ctx->ro_label);
15e8a8e4 CB	130	if (ret < 0)
	131	return ret;
	132
842f4bdd AH	133	ctx->override_ro_active_level = true;
842f4bdd AH	134	ctx->ro_gpio = gpio_to_desc(gpio);
15e8a8e4 CB	135
15e8a8e4 CB	136	return 0;
5aa7dad3 GL	137	}
	138	EXPORT_SYMBOL(mmc_gpio_request_ro);
	139
740a221e	140	void mmc_gpiod_request_cd_irq(struct mmc_host *host)
26652671 AH	141	{
	142	struct mmc_gpio *ctx = host->slot.handler_priv;
	143	int ret, irq;
	144
	145	if (host->slot.cd_irq >= 0 \|\| !ctx \|\| !ctx->cd_gpio)
	146	return;
	147
	148	irq = gpiod_to_irq(ctx->cd_gpio);
	149
	150	/*
	151	* Even if gpiod_to_irq() returns a valid IRQ number, the platform might
	152	* still prefer to poll, e.g., because that IRQ number is already used
	153	* by another unit and cannot be shared.
	154	*/
	155	if (irq >= 0 && host->caps & MMC_CAP_NEEDS_POLL)
	156	irq = -EINVAL;
	157
	158	if (irq >= 0) {
	159	ret = devm_request_threaded_irq(&host->class_dev, irq,
	160	NULL, mmc_gpio_cd_irqt,
	161	IRQF_TRIGGER_RISING \| IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	162	ctx->cd_label, host);
	163	if (ret < 0)
	164	irq = ret;
	165	}
	166
	167	host->slot.cd_irq = irq;
	168
	169	if (irq < 0)
	170	host->caps \|= MMC_CAP_NEEDS_POLL;
	171	}
740a221e	172	EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
26652671	173
d65b5ae8 SG	174	/**
	175	* mmc_gpio_request_cd - request a gpio for card-detection
	176	* @host: mmc host
	177	* @gpio: gpio number requested
214fc309	178	* @debounce: debounce time in microseconds
d65b5ae8 SG	179	*
	180	* As devm_* managed functions are used in mmc_gpio_request_cd(), client
	181	* drivers do not need to explicitly call mmc_gpio_free_cd() for freeing up,
	182	* if the requesting and freeing are only needed at probing and unbinding time
	183	* for once. However, if client drivers do something special like runtime
	184	* switching for card-detection, they are responsible for calling
	185	* mmc_gpio_request_cd() and mmc_gpio_free_cd() as a pair on their own.
	186	*
214fc309 LP	187	* If GPIO debouncing is desired, set the debounce parameter to a non-zero
	188	* value. The caller is responsible for ensuring that the GPIO driver associated
	189	* with the GPIO supports debouncing, otherwise an error will be returned.
	190	*
d65b5ae8 SG	191	* Returns zero on success, else an error.
d65b5ae8 SG	192	*/
214fc309 LP	193	int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
214fc309 LP	194	unsigned int debounce)
349ab524	195	{
fd0ea65d	196	struct mmc_gpio *ctx;
349ab524 GL	197	int ret;
349ab524 GL	198
a7d1a1eb GL	199	ret = mmc_gpio_alloc(host);
	200	if (ret < 0)
	201	return ret;
349ab524	202
a7d1a1eb	203	ctx = host->slot.handler_priv;
349ab524	204
d65b5ae8 SG	205	ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
d65b5ae8 SG	206	ctx->cd_label);
349ab524	207	if (ret < 0)
a7d1a1eb GL	208	/*
	209	* don't bother freeing memory. It might still get used by other
	210	* slot functions, in any case it will be freed, when the device
	211	* is destroyed.
	212	*/
	213	return ret;
349ab524	214
214fc309 LP	215	if (debounce) {
	216	ret = gpio_set_debounce(gpio, debounce);
	217	if (ret < 0)
	218	return ret;
	219	}
	220
842f4bdd AH	221	ctx->override_cd_active_level = true;
842f4bdd AH	222	ctx->cd_gpio = gpio_to_desc(gpio);
349ab524	223
26652671 AH	224	mmc_gpiod_request_cd_irq(host);
26652671 AH	225
349ab524	226	return 0;
349ab524	227	}
fd0ea65d	228	EXPORT_SYMBOL(mmc_gpio_request_cd);
349ab524	229
d65b5ae8 SG	230	/**
	231	* mmc_gpio_free_ro - free the write-protection gpio
	232	* @host: mmc host
	233	*
	234	* It's provided only for cases that client drivers need to manually free
	235	* up the write-protection gpio requested by mmc_gpio_request_ro().
	236	*/
5aa7dad3 GL	237	void mmc_gpio_free_ro(struct mmc_host *host)
	238	{
	239	struct mmc_gpio *ctx = host->slot.handler_priv;
	240	int gpio;
	241
842f4bdd	242	if (!ctx \|\| !ctx->ro_gpio)
5aa7dad3 GL	243	return;
5aa7dad3 GL	244
842f4bdd AH	245	gpio = desc_to_gpio(ctx->ro_gpio);
842f4bdd AH	246	ctx->ro_gpio = NULL;
5aa7dad3	247
d65b5ae8	248	devm_gpio_free(&host->class_dev, gpio);
5aa7dad3 GL	249	}
	250	EXPORT_SYMBOL(mmc_gpio_free_ro);
	251
d65b5ae8 SG	252	/**
	253	* mmc_gpio_free_cd - free the card-detection gpio
	254	* @host: mmc host
	255	*
	256	* It's provided only for cases that client drivers need to manually free
	257	* up the card-detection gpio requested by mmc_gpio_request_cd().
	258	*/
fd0ea65d	259	void mmc_gpio_free_cd(struct mmc_host *host)
349ab524	260	{
27410ee7	261	struct mmc_gpio *ctx = host->slot.handler_priv;
befe4048	262	int gpio;
349ab524	263
842f4bdd	264	if (!ctx \|\| !ctx->cd_gpio)
0e9f480b GL	265	return;
0e9f480b GL	266
befe4048	267	if (host->slot.cd_irq >= 0) {
d65b5ae8	268	devm_free_irq(&host->class_dev, host->slot.cd_irq, host);
befe4048 GL	269	host->slot.cd_irq = -EINVAL;
	270	}
	271
842f4bdd AH	272	gpio = desc_to_gpio(ctx->cd_gpio);
842f4bdd AH	273	ctx->cd_gpio = NULL;
befe4048	274
d65b5ae8	275	devm_gpio_free(&host->class_dev, gpio);
349ab524	276	}
fd0ea65d	277	EXPORT_SYMBOL(mmc_gpio_free_cd);
740a221e AH	278
	279	/**
	280	* mmc_gpiod_request_cd - request a gpio descriptor for card-detection
	281	* @host: mmc host
	282	* @con_id: function within the GPIO consumer
	283	* @idx: index of the GPIO to obtain in the consumer
	284	* @override_active_level: ignore %GPIO_ACTIVE_LOW flag
	285	* @debounce: debounce time in microseconds
	286	*
	287	* Use this function in place of mmc_gpio_request_cd() to use the GPIO
	288	* descriptor API. Note that it is paired with mmc_gpiod_free_cd() not
	289	* mmc_gpio_free_cd(). Note also that it must be called prior to mmc_add_host()
	290	* otherwise the caller must also call mmc_gpiod_request_cd_irq().
	291	*
	292	* Returns zero on success, else an error.
	293	*/
	294	int mmc_gpiod_request_cd(struct mmc_host host, const char con_id,
	295	unsigned int idx, bool override_active_level,
	296	unsigned int debounce)
	297	{
	298	struct mmc_gpio *ctx;
	299	struct gpio_desc *desc;
	300	int ret;
	301
	302	ret = mmc_gpio_alloc(host);
	303	if (ret < 0)
	304	return ret;
	305
	306	ctx = host->slot.handler_priv;
	307
	308	if (!con_id)
	309	con_id = ctx->cd_label;
	310
9fbc6950	311	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
740a221e AH	312	if (IS_ERR(desc))
	313	return PTR_ERR(desc);
	314
740a221e AH	315	if (debounce) {
	316	ret = gpiod_set_debounce(desc, debounce);
	317	if (ret < 0)
	318	return ret;
	319	}
	320
	321	ctx->override_cd_active_level = override_active_level;
	322	ctx->cd_gpio = desc;
	323
	324	return 0;
	325	}
	326	EXPORT_SYMBOL(mmc_gpiod_request_cd);
	327
9d2fa242 LW	328	/**
	329	* mmc_gpiod_request_ro - request a gpio descriptor for write protection
	330	* @host: mmc host
	331	* @con_id: function within the GPIO consumer
	332	* @idx: index of the GPIO to obtain in the consumer
	333	* @override_active_level: ignore %GPIO_ACTIVE_LOW flag
	334	* @debounce: debounce time in microseconds
	335	*
	336	* Use this function in place of mmc_gpio_request_ro() to use the GPIO
	337	* descriptor API. Note that it is paired with mmc_gpiod_free_ro() not
	338	* mmc_gpio_free_ro().
	339	*
	340	* Returns zero on success, else an error.
	341	*/
	342	int mmc_gpiod_request_ro(struct mmc_host host, const char con_id,
	343	unsigned int idx, bool override_active_level,
	344	unsigned int debounce)
	345	{
	346	struct mmc_gpio *ctx;
	347	struct gpio_desc *desc;
	348	int ret;
	349
	350	ret = mmc_gpio_alloc(host);
	351	if (ret < 0)
	352	return ret;
	353
	354	ctx = host->slot.handler_priv;
	355
	356	if (!con_id)
	357	con_id = ctx->ro_label;
	358
	359	desc = devm_gpiod_get_index(host->parent, con_id, idx, GPIOD_IN);
	360	if (IS_ERR(desc))
	361	return PTR_ERR(desc);
	362
	363	if (debounce) {
	364	ret = gpiod_set_debounce(desc, debounce);
	365	if (ret < 0)
	366	return ret;
	367	}
	368
	369	ctx->override_ro_active_level = override_active_level;
	370	ctx->ro_gpio = desc;
	371
	372	return 0;
	373	}
	374	EXPORT_SYMBOL(mmc_gpiod_request_ro);
	375
740a221e AH	376	/**
	377	* mmc_gpiod_free_cd - free the card-detection gpio descriptor
	378	* @host: mmc host
	379	*
	380	* It's provided only for cases that client drivers need to manually free
	381	* up the card-detection gpio requested by mmc_gpiod_request_cd().
	382	*/
	383	void mmc_gpiod_free_cd(struct mmc_host *host)
	384	{
	385	struct mmc_gpio *ctx = host->slot.handler_priv;
	386
	387	if (!ctx \|\| !ctx->cd_gpio)
	388	return;
	389
	390	if (host->slot.cd_irq >= 0) {
	391	devm_free_irq(&host->class_dev, host->slot.cd_irq, host);
	392	host->slot.cd_irq = -EINVAL;
	393	}
	394
	395	devm_gpiod_put(&host->class_dev, ctx->cd_gpio);
	396
	397	ctx->cd_gpio = NULL;
	398	}
	399	EXPORT_SYMBOL(mmc_gpiod_free_cd);