| Message ID | 1409137253-25189-2-git-send-email-linus.walleij@linaro.org |
|---|---|
| State | New |
| Headers | show |
On 27 August 2014 13:00, Linus Walleij <linus.walleij@linaro.org> wrote: > 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: Alexandre Courbot <acourbot@nvidia.com> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Thanks! Applied for next. Kind regards Uffe > --- > drivers/mmc/core/slot-gpio.c | 48 +++++++++++++++++++++++++++++++++++++++++++ > include/linux/mmc/slot-gpio.h | 3 +++ > 2 files changed, 51 insertions(+) > > 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 > * > diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h > index d2433381e828..a0d0442c15bf 100644 > --- a/include/linux/mmc/slot-gpio.h > +++ b/include/linux/mmc/slot-gpio.h > @@ -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); > > -- > 1.9.3 > -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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 * diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h index d2433381e828..a0d0442c15bf 100644 --- a/include/linux/mmc/slot-gpio.h +++ b/include/linux/mmc/slot-gpio.h @@ -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);