diff options
| author | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2013-08-08 10:38:31 (GMT) |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-08-25 03:45:09 (GMT) |
| commit | 214fc309d1387e822d606a33a10e31cacfe83520 (patch) | |
| tree | 2c266dd95d8da7f54d7b43c20e5c2c0ebe6165be /drivers/mmc/core | |
| parent | 7725a52c03df4dff3ac3fc621749407fb319d47f (diff) | |
| download | linux-fsl-qoriq-214fc309d1387e822d606a33a10e31cacfe83520.tar.xz | |
mmc: slot-gpio: Add debouncing capability to mmc_gpio_request_cd()
Add a debounce parameter to the mmc_gpio_request_cd() function that
enables GPIO debouncing when set to a non-zero value. This can be used
by MMC host drivers to enable debouncing on the card detect signal.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core')
| -rw-r--r-- | drivers/mmc/core/host.c | 2 | ||||
| -rw-r--r-- | drivers/mmc/core/slot-gpio.c | 14 |
2 files changed, 14 insertions, 2 deletions
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index 6fb6f77..49bc403 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -374,7 +374,7 @@ int mmc_of_parse(struct mmc_host *host) if (!(flags & OF_GPIO_ACTIVE_LOW)) gpio_inv_cd = true; - ret = mmc_gpio_request_cd(host, gpio); + ret = mmc_gpio_request_cd(host, gpio, 0); if (ret < 0) { dev_err(host->parent, "Failed to request CD GPIO #%d: %d!\n", diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c index 3242351..46596b71 100644 --- a/drivers/mmc/core/slot-gpio.c +++ b/drivers/mmc/core/slot-gpio.c @@ -135,6 +135,7 @@ EXPORT_SYMBOL(mmc_gpio_request_ro); * mmc_gpio_request_cd - request a gpio for card-detection * @host: mmc host * @gpio: gpio number requested + * @debounce: debounce time in microseconds * * As devm_* managed functions are used in mmc_gpio_request_cd(), client * drivers do not need to explicitly call mmc_gpio_free_cd() for freeing up, @@ -143,9 +144,14 @@ EXPORT_SYMBOL(mmc_gpio_request_ro); * switching for card-detection, they are responsible for calling * mmc_gpio_request_cd() and mmc_gpio_free_cd() as a pair on their own. * + * If GPIO debouncing is desired, set the debounce parameter to a non-zero + * value. The caller is responsible for ensuring that the GPIO driver associated + * with the GPIO supports debouncing, otherwise an error will be returned. + * * Returns zero on success, else an error. */ -int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio) +int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio, + unsigned int debounce) { struct mmc_gpio *ctx; int irq = gpio_to_irq(gpio); @@ -167,6 +173,12 @@ int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio) */ return ret; + if (debounce) { + ret = gpio_set_debounce(gpio, debounce); + if (ret < 0) + return ret; + } + /* * Even if gpio_to_irq() returns a valid IRQ number, the platform might * still prefer to poll, e.g., because that IRQ number is already used |