/**
* 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,
* if the requesting and freeing are only needed at probing and unbinding time
* for once. However, if client drivers do something special like runtime
* 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,
unsigned int debounce)
{
struct mmc_gpio *ctx;
int ret;
ret = mmc_gpio_alloc(host);
if (ret < 0)
return ret;
ctx = host->slot.handler_priv;
ret = devm_gpio_request_one(&host->class_dev, gpio, GPIOF_DIR_IN,
ctx->cd_label);
if (ret < 0)
/*
* don't bother freeing memory. It might still get used by other
* slot functions, in any case it will be freed, when the device
* is destroyed.
*/
return ret;
if (debounce) {
ret = gpio_set_debounce(gpio, debounce);
if (ret < 0)
return ret;
}
ctx->override_cd_active_level = true;
ctx->cd_gpio = gpio_to_desc(gpio);
mmc_gpiod_request_cd_irq(host);
return 0;
}
static int sdhci_sirf_probe(struct platform_device *pdev)
{
struct sdhci_host *host;
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_sirf_priv *priv;
struct clk *clk;
int gpio_cd;
int ret;
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "unable to get clock");
return PTR_ERR(clk);
}
if (pdev->dev.of_node)
gpio_cd = of_get_named_gpio(pdev->dev.of_node, "cd-gpios", 0);
else
gpio_cd = -EINVAL;
host = sdhci_pltfm_init(pdev, &sdhci_sirf_pdata, sizeof(struct sdhci_sirf_priv));
if (IS_ERR(host))
return PTR_ERR(host);
pltfm_host = sdhci_priv(host);
pltfm_host->clk = clk;
priv = sdhci_pltfm_priv(pltfm_host);
priv->gpio_cd = gpio_cd;
sdhci_get_of_property(pdev);
ret = clk_prepare_enable(pltfm_host->clk);
if (ret)
goto err_clk_prepare;
ret = sdhci_add_host(host);
if (ret)
goto err_sdhci_add;
/*
* We must request the IRQ after sdhci_add_host(), as the tasklet only
* 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, 0);
if (ret) {
dev_err(&pdev->dev, "card detect irq request failed: %d\n",
ret);
goto err_request_cd;
}
mmc_gpiod_request_cd_irq(host->mmc);
}
return 0;
err_request_cd:
sdhci_remove_host(host, 0);
err_sdhci_add:
clk_disable_unprepare(pltfm_host->clk);
err_clk_prepare:
sdhci_pltfm_free(pdev);
return ret;
}
