diff options
| -rw-r--r-- | drivers/mmc/core/slot-gpio.c | 52 | ||||
| -rw-r--r-- | include/linux/mmc/slot-gpio.h | 4 |
2 files changed, 55 insertions, 1 deletions
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c index 41689da14b8..058242916ce 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 @@ 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; diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h index 1a977d7ba3b..7d88d27bfaf 100644 --- a/include/linux/mmc/slot-gpio.h +++ b/include/linux/mmc/slot-gpio.h @@ -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); |