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Commit 9d2fa242 authored by Linus Walleij's avatar Linus Walleij Committed by Ulf Hansson
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mmc: slot-gpio: add gpiod variant to get wp GPIO 



This makes it possible to get the write protect (read only)
GPIO line from a GPIO descriptor. Written to exactly mirror
the card detect function.

Acked-by: default avatarAlexandre Courbot <acourbot@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 9fbc6950

drivers/mmc/core/slot-gpio.c

+48 −0
Original line number Diff line number Diff line
@@ -325,6 +325,54 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id, 
}

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

include/linux/mmc/slot-gpio.h

+3 −0
Original line number Diff line number Diff line
@@ -25,6 +25,9 @@ void mmc_gpio_free_cd(struct mmc_host *host); 
int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,

			 unsigned int idx, bool override_active_level,

			 unsigned int debounce);

int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,

			 unsigned int idx, bool override_active_level,

			 unsigned int debounce);

void mmc_gpiod_free_cd(struct mmc_host *host);

void mmc_gpiod_request_cd_irq(struct mmc_host *host);