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mmc: slot-gpio: Add debouncing capability to mmc_gpio_request_cd()

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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>
This commit is contained in:
Laurent Pinchart 2013-08-08 12:38:31 +02:00 committed by Chris Ball
parent 7725a52c03
commit 214fc309d1
10 changed files with 25 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/mmc/core/host.c
View File

@ -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",

14
drivers/mmc/core/slot-gpio.c
View File

@ -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

2
drivers/mmc/host/jz4740_mmc.c
View File

@ -713,7 +713,7 @@ static int jz4740_mmc_request_gpios(struct mmc_host *mmc,
mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
if (gpio_is_valid(pdata->gpio_card_detect)) {
ret = mmc_gpio_request_cd(mmc, pdata->gpio_card_detect);
ret = mmc_gpio_request_cd(mmc, pdata->gpio_card_detect, 0);
if (ret)
return ret;
}

3
drivers/mmc/host/mvsdio.c
View File

@ -757,7 +757,8 @@ static int __init mvsd_probe(struct platform_device *pdev)
if (mvsd_data->gpio_card_detect &&
gpio_is_valid(mvsd_data->gpio_card_detect)) {
ret = mmc_gpio_request_cd(mmc,
mvsd_data->gpio_card_detect);
mvsd_data->gpio_card_detect,
0);
if (ret)
goto out;
} else {

2
drivers/mmc/host/sdhci-esdhc-imx.c
View File

@ -616,7 +616,7 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
/* card_detect */
switch (boarddata->cd_type) {
case ESDHC_CD_GPIO:
err = mmc_gpio_request_cd(host->mmc, boarddata->cd_gpio);
err = mmc_gpio_request_cd(host->mmc, boarddata->cd_gpio, 0);
if (err) {
dev_err(mmc_dev(host->mmc),
"failed to request card-detect gpio!\n");

3
drivers/mmc/host/sdhci-pxav3.c
View File

@ -278,7 +278,8 @@ static int sdhci_pxav3_probe(struct platform_device *pdev)
host->mmc->pm_caps |= pdata->pm_caps;
if (gpio_is_valid(pdata->ext_cd_gpio)) {
ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio);
ret = mmc_gpio_request_cd(host->mmc, pdata->ext_cd_gpio,
0);
if (ret) {
dev_err(mmc_dev(host->mmc),
"failed to allocate card detect gpio\n");

2
drivers/mmc/host/sdhci-sirf.c
View File

@ -84,7 +84,7 @@ static int sdhci_sirf_probe(struct platform_device *pdev)
* gets setup in sdhci_add_host() and we oops.
*/
if (gpio_is_valid(priv->gpio_cd)) {
ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd);
ret = mmc_gpio_request_cd(host->mmc, priv->gpio_cd, 0);
if (ret) {
dev_err(&pdev->dev, "card detect irq request failed: %d\n",
ret);

2
drivers/mmc/host/sh_mmcif.c
View File

@ -1436,7 +1436,7 @@ static int sh_mmcif_probe(struct platform_device *pdev)
}
if (pd && pd->use_cd_gpio) {
ret = mmc_gpio_request_cd(mmc, pd->cd_gpio);
ret = mmc_gpio_request_cd(mmc, pd->cd_gpio, 0);
if (ret < 0)
goto erqcd;
}

2
drivers/mmc/host/tmio_mmc_pio.c
View File

@ -1110,7 +1110,7 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
dev_pm_qos_expose_latency_limit(&pdev->dev, 100);
if (pdata->flags & TMIO_MMC_USE_GPIO_CD) {
ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio);
ret = mmc_gpio_request_cd(mmc, pdata->cd_gpio, 0);
if (ret < 0) {
tmio_mmc_host_remove(_host);
return ret;

3
include/linux/mmc/slot-gpio.h
View File

@ -18,7 +18,8 @@ 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);
int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
unsigned int debounce);
void mmc_gpio_free_cd(struct mmc_host *host);
#endif