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mmc: core: add WP pin handler to slot functions

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Card Write-Protect pin is often implemented, using a GPIO, which makes
it simple to provide a generic handler for it.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Guennadi Liakhovetski 2012-05-01 16:59:38 +02:00 committed by Chris Ball
parent a7d1a1ebd8
commit 5aa7dad305
2 changed files with 55 additions and 1 deletions
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52
drivers/mmc/core/slot-gpio.c
View file

@ -18,7 +18,9 @@
#include <linux/slab.h>
struct mmc_gpio {
int ro_gpio;
int cd_gpio;
char *ro_label;
char cd_label[0];
};
@ -43,11 +45,14 @@ static int mmc_gpio_alloc(struct mmc_host *host)
* before device_add(), i.e., between mmc_alloc_host() and
* mmc_add_host()
*/
ctx = devm_kzalloc(&host->class_dev, sizeof(*ctx) + len,
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));
ctx->cd_gpio = -EINVAL;
ctx->ro_gpio = -EINVAL;
host->slot.handler_priv = ctx;
}
}
@ -57,6 +62,18 @@ static int mmc_gpio_alloc(struct mmc_host *host)
return ctx ? 0 : -ENOMEM;
}
int mmc_gpio_get_ro(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
if (!ctx || !gpio_is_valid(ctx->ro_gpio))
return -ENOSYS;
return !gpio_get_value_cansleep(ctx->ro_gpio) ^
!!(host->caps2 & MMC_CAP2_RO_ACTIVE_HIGH);
}
EXPORT_SYMBOL(mmc_gpio_get_ro);
int mmc_gpio_get_cd(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
@ -69,6 +86,24 @@ int mmc_gpio_get_cd(struct mmc_host *host)
}
EXPORT_SYMBOL(mmc_gpio_get_cd);
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;
return gpio_request_one(gpio, GPIOF_DIR_IN, ctx->ro_label);
}
EXPORT_SYMBOL(mmc_gpio_request_ro);
int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
{
struct mmc_gpio *ctx;
@ -117,6 +152,21 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio)
}
EXPORT_SYMBOL(mmc_gpio_request_cd);
void mmc_gpio_free_ro(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
int gpio;
if (!ctx || !gpio_is_valid(ctx->ro_gpio))
return;
gpio = ctx->ro_gpio;
ctx->ro_gpio = -EINVAL;
gpio_free(gpio);
}
EXPORT_SYMBOL(mmc_gpio_free_ro);
void mmc_gpio_free_cd(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;

4
include/linux/mmc/slot-gpio.h
View file

@ -13,6 +13,10 @@
struct mmc_host;
int mmc_gpio_get_ro(struct mmc_host *host);
int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio);
void mmc_gpio_free_ro(struct mmc_host *host);
int mmc_gpio_get_cd(struct mmc_host *host);
int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio);
void mmc_gpio_free_cd(struct mmc_host *host);