On 16 November 2012 19:58, Tomasz Figa <t.figa@xxxxxxxxxxx> wrote:
> The set of GPIO pins used by sdhci-s3c driver varies between
> configurations, such as card detect method, pinctrl availability, etc.
> This overly complicates the code requesting and freeing GPIO pins, which
> must check which pins are used, when freeing them.
>
> This patch modifies the sdhci-s3c driver to use devm_gpio_request to
> free requested pins automatically after unbinding the driver.
>
> Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-s3c.c | 40 +++++++++-------------------------------
> 1 file changed, 9 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
> index 2903949..75f85fd 100644
> --- a/drivers/mmc/host/sdhci-s3c.c
> +++ b/drivers/mmc/host/sdhci-s3c.c
> @@ -406,7 +406,7 @@ static void sdhci_s3c_setup_card_detect_gpio(struct sdhci_s3c *sc)
> struct s3c_sdhci_platdata *pdata = sc->pdata;
> struct device *dev = &sc->pdev->dev;
>
> - if (gpio_request(pdata->ext_cd_gpio, "SDHCI EXT CD") == 0) {
> + if (devm_gpio_request(dev, pdata->ext_cd_gpio, "SDHCI EXT CD") == 0) {
> sc->ext_cd_gpio = pdata->ext_cd_gpio;
> sc->ext_cd_irq = gpio_to_irq(pdata->ext_cd_gpio);
> if (sc->ext_cd_irq &&
> @@ -487,7 +487,7 @@ static int __devinit sdhci_s3c_parse_dt(struct device *dev,
> if (of_get_property(node, "cd-inverted", NULL))
> pdata->ext_cd_gpio_invert = 1;
> } else if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL) {
> - ret = gpio_request(gpio, "sdhci-cd");
> + ret = devm_gpio_request(dev, gpio, "sdhci-cd");
> if (ret) {
> dev_err(dev, "card detect gpio request failed\n");
> return -EINVAL;
> @@ -501,28 +501,20 @@ static int __devinit sdhci_s3c_parse_dt(struct device *dev,
> gpio = of_get_gpio(node, cnt);
> if (!gpio_is_valid(gpio)) {
> dev_err(dev, "invalid gpio[%d]\n", cnt);
> - goto err_free_dt_cd_gpio;
> + return -EINVAL;
> }
> ourhost->gpios[cnt] = gpio;
> }
>
> for (cnt = 0; cnt < NUM_GPIOS(pdata->max_width); cnt++) {
> - ret = gpio_request(ourhost->gpios[cnt], "sdhci-gpio");
> + ret = devm_gpio_request(dev, ourhost->gpios[cnt], "sdhci-gpio");
> if (ret) {
> dev_err(dev, "gpio[%d] request failed\n", cnt);
> - goto err_free_dt_gpios;
> + return -EINVAL;
> }
> }
>
> return 0;
> -
> - err_free_dt_gpios:
> - while (--cnt >= 0)
> - gpio_free(ourhost->gpios[cnt]);
> - err_free_dt_cd_gpio:
> - if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL)
> - gpio_free(ourhost->ext_cd_gpio);
> - return -EINVAL;
> }
> #else
> static int __devinit sdhci_s3c_parse_dt(struct device *dev,
> @@ -579,13 +571,13 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
> pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> if (!pdata) {
> ret = -ENOMEM;
> - goto err_pdata;
> + goto err_pdata_io_clk;
> }
>
> if (pdev->dev.of_node) {
> ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);
> if (ret)
> - goto err_pdata;
> + goto err_pdata_io_clk;
> } else {
> memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
> sc->ext_cd_gpio = -1; /* invalid gpio number */
> @@ -603,7 +595,7 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
> if (IS_ERR(sc->clk_io)) {
> dev_err(dev, "failed to get io clock\n");
> ret = PTR_ERR(sc->clk_io);
> - goto err_io_clk;
> + goto err_pdata_io_clk;
> }
>
> /* enable the local io clock and keep it running for the moment. */
> @@ -765,13 +757,7 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
> clk_disable(sc->clk_io);
> clk_put(sc->clk_io);
>
> - err_io_clk:
> - for (ptr = 0; ptr < NUM_GPIOS(sc->pdata->max_width); ptr++)
> - gpio_free(sc->gpios[ptr]);
> - if (pdata->cd_type == S3C_SDHCI_CD_INTERNAL)
> - gpio_free(sc->ext_cd_gpio);
> -
> - err_pdata:
> + err_pdata_io_clk:
> sdhci_free_host(host);
>
> return ret;
> @@ -790,9 +776,6 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
> if (sc->ext_cd_irq)
> free_irq(sc->ext_cd_irq, sc);
>
> - if (gpio_is_valid(sc->ext_cd_gpio))
> - gpio_free(sc->ext_cd_gpio);
> -
> #ifdef CONFIG_PM_RUNTIME
> clk_enable(sc->clk_io);
> #endif
> @@ -812,11 +795,6 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
> clk_disable(sc->clk_io);
> clk_put(sc->clk_io);
>
> - if (pdev->dev.of_node) {
> - for (ptr = 0; ptr < NUM_GPIOS(sc->pdata->max_width); ptr++)
> - gpio_free(sc->gpios[ptr]);
> - }
> -
> sdhci_free_host(host);
> platform_set_drvdata(pdev, NULL);
>
> --
> 1.8.0
Acked-by: Thomas Abraham <thomas.abraham@xxxxxxxxxx>
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