mmc: core: add WP pin handler to slot functions
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>
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 41689da..0582429 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -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 @@
* 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 @@
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 @@
}
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 @@
}
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;