diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/core/slot-gpio.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c index 908c2b29e79f..e3fce4493fab 100644 --- a/drivers/mmc/core/slot-gpio.c +++ b/drivers/mmc/core/slot-gpio.c @@ -326,6 +326,54 @@ 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 * |
