MMC: S3C24XX: Add support to invert write protect line

Support for inverting the sense of the MMC driver's write
protect detection line.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

2 files changed, 11 insertions, 2 deletions

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index 684a10ca2e8f..4fd11d8864eb 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -1083,11 +1083,18 @@ static void s3cmci_reset(struct s3cmci_host *host)
 static int s3cmci_get_ro(struct mmc_host *mmc)
 {
         struct s3cmci_host *host = mmc_priv(mmc);
+        struct s3c24xx_mci_pdata *pdata = host->pdata;
+        int ret;
 
-        if (host->pdata->gpio_wprotect == 0)
+        if (pdata->gpio_wprotect == 0)
                 return 0;
 
-        return s3c2410_gpio_getpin(host->pdata->gpio_wprotect);
+        ret = s3c2410_gpio_getpin(pdata->gpio_wprotect);
+
+        if (pdata->wprotect_invert)
+                ret = !ret;
+
+        return ret;
 }
 
 static struct mmc_host_ops s3cmci_ops = {
diff --git a/include/asm-arm/plat-s3c24xx/mci.h b/include/asm-arm/plat-s3c24xx/mci.h
index 5be2c1449c6d..4f4ccd18f0cb 100644
--- a/include/asm-arm/plat-s3c24xx/mci.h
+++ b/include/asm-arm/plat-s3c24xx/mci.h
@@ -2,6 +2,8 @@
 #define _ARCH_MCI_H
 
 struct s3c24xx_mci_pdata {
+        unsigned int    wprotect_invert : 1;
+
         unsigned int    gpio_detect;
         unsigned int    gpio_wprotect;
         unsigned long   ocr_avail;