On Tue, Mar 09, 2010 at 07:07:05PM +0530, Thomas Abraham wrote:
> This patch adds platform parameters for external GPIO support for card
> insertion/removal events. This is used for S3C SDHCI controllers that
> does not use the SDCD pin for card detection.
>
> Signed-off-by: Thomas Abraham <[email protected]>
> ---
> arch/arm/plat-samsung/include/plat/sdhci.h | 7 ++++++
> drivers/mmc/host/sdhci-s3c.c | 30
> ++++++++++++++++++++++++++++
> 2 files changed, 37 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/plat-samsung/include/plat/sdhci.h
> b/arch/arm/plat-samsung/include/plat/sdhci.h
> index 7d07cd7..b0a0528 100644
> --- a/arch/arm/plat-samsung/include/plat/sdhci.h
> +++ b/arch/arm/plat-samsung/include/plat/sdhci.h
> @@ -29,6 +29,9 @@ struct mmc_ios;
> * is necessary the controllers and/or GPIO blocks require the
> * changing of driver-strength and other controls dependant on
> * the card and speed of operation.
> + * @cfg_ext_cd: Configure external interrupt line.
> + * @is_card_present: Returns status of card availability.
> + * @ext_cd: The external GPIO interrupt number to be used.
Do you really need cfg_ext_cd?
> * Initialisation data specific to either the machine or the platform
> * for the device driver to use or call-back when configuring gpio or
> @@ -45,6 +48,10 @@ struct s3c_sdhci_platdata {
> void __iomem *regbase,
> struct mmc_ios *ios,
> struct mmc_card *card);
> +
> + void (*cfg_ext_cd)(void);
> + unsigned int (*is_card_present)(void);
> + unsigned int ext_cd;
> };
>
> /**
> diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
> index ebb17ac..073b56f 100644
> --- a/drivers/mmc/host/sdhci-s3c.c
> +++ b/drivers/mmc/host/sdhci-s3c.c
> @@ -212,6 +212,20 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host,
> unsigned int clock)
> }
> }
>
> +static irqreturn_t s3c_sdhci_irq_extcd(int irq, void *dev_id)
> +{
> + struct sdhci_s3c *sc = dev_id;
> + u32 present = sc->pdata->is_card_present();
> +
> + if (present)
> + sc->host->flags &= ~SDHCI_DEVICE_DEAD;
> + else
> + sc->host->flags |= SDHCI_DEVICE_DEAD;
> +
> + tasklet_schedule(&sc->host->card_tasklet);
> + return IRQ_HANDLED;
> +}
> +
> static struct sdhci_ops sdhci_s3c_ops = {
> .get_max_clock = sdhci_s3c_get_max_clk,
> .get_timeout_clock = sdhci_s3c_get_timeout_clk,
> @@ -346,14 +360,30 @@ static int __devinit sdhci_s3c_probe(struct
> platform_device *pdev)
> host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR |
> SDHCI_QUIRK_32BIT_DMA_SIZE);
>
> + if (pdata->cfg_ext_cd) {
> + pdata->cfg_ext_cd();
> + if (!pdata->is_card_present())
> + host->flags |= SDHCI_DEVICE_DEAD;
> + }
> +
> ret = sdhci_add_host(host);
> if (ret) {
> dev_err(dev, "sdhci_add_host() failed\n");
> goto err_add_host;
> }
>
> + if (pdata->cfg_ext_cd) {
> + ret = request_irq(pdata->ext_cd, s3c_sdhci_irq_extcd,
> + IRQF_SHARED, mmc_hostname(host->mmc), sc);
> + if (ret)
> + goto err_req_cdirq;
> + }
> +
> return 0;
>
> + err_req_cdirq:
> + sdhci_remove_host(host, 0);
> +
> err_add_host:
> release_resource(sc->ioarea);
> kfree(sc->ioarea);
> --
> 1.6.6.rc2
>
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--
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