mfd: Allow the platform to specify the sh_mobile_sdhi get_cd handler

On some platforms (e.g. AP4EVB) the card detect pin of a slot is not
directly connected to the sdhi hardware, so that polling needs to be used
with tmio_mmc and card detection is handled in the platform code.
This patch allows to set tmio_mmc capabilities (to pass the
MMC_CAP_NEEDS_POLL flag) and exposes a get_cd hook for that purpose.

Signed-off-by: Arnd Hannemann <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/mfd/sh_mobile_sdhi.c

···
 		p->set_pwr(pdev, state);
 }
 
+static int sh_mobile_sdhi_get_cd(struct platform_device *tmio)
+{
+	struct platform_device *pdev = to_platform_device(tmio->dev.parent);
+	struct sh_mobile_sdhi_info *p = pdev->dev.platform_data;
+
+	if (p && p->get_cd)
+		return p->get_cd(pdev);
+	else
+		return -ENOSYS;
+}
+
 static int __devinit sh_mobile_sdhi_probe(struct platform_device *pdev)
 {
 	struct sh_mobile_sdhi *priv;
···
 
 	mmc_data->hclk = clk_get_rate(priv->clk);
 	mmc_data->set_pwr = sh_mobile_sdhi_set_pwr;
+	mmc_data->get_cd = sh_mobile_sdhi_get_cd;
 	mmc_data->capabilities = MMC_CAP_MMC_HIGHSPEED;
 	if (p) {
 		mmc_data->flags = p->tmio_flags;
 		mmc_data->ocr_mask = p->tmio_ocr_mask;
+		mmc_data->capabilities |= p->tmio_caps;
 	}
 
 	if (p && p->dma_slave_tx >= 0 && p->dma_slave_rx >= 0) {

include/linux/mfd/sh_mobile_sdhi.h

···
 	int dma_slave_tx;
 	int dma_slave_rx;
 	unsigned long tmio_flags;
+	unsigned long tmio_caps;
 	u32 tmio_ocr_mask;	/* available MMC voltages */
 	void (*set_pwr)(struct platform_device *pdev, int state);
+	int (*get_cd)(struct platform_device *pdev);
 };
 
 #endif /* __SH_MOBILE_SDHI_H__ */