sdio: basic parsing of FBR

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 7ce3e3104d21..be623856f288 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -23,8 +23,34 @@
 #include "sd_ops.h"
 #include "sdio_ops.h"
 
+static int sdio_read_fbr(struct sdio_func *func)
+{
+        int ret;
+        unsigned char data;
+
+        ret = mmc_io_rw_direct(func->card, 0, 0,
+                func->num * 0x100 + SDIO_FBR_STD_IF, 0, &data);
+        if (ret)
+                goto out;
+
+        data &= 0x0f;
+
+        if (data == 0x0f) {
+                ret = mmc_io_rw_direct(func->card, 0, 0,
+                        func->num * 0x100 + SDIO_FBR_STD_IF_EXT, 0, &data);
+                if (ret)
+                        goto out;
+        }
+
+        func->class = data;
+
+out:
+        return ret;
+}
+
 static int sdio_init_func(struct mmc_card *card, unsigned int fn)
 {
+        int ret;
         struct sdio_func *func;
 
         BUG_ON(fn > SDIO_MAX_FUNCS);
@@ -35,9 +61,21 @@ static int sdio_init_func(struct mmc_card *card, unsigned int fn)
 
         func->num = fn;
 
+        ret = sdio_read_fbr(func);
+        if (ret)
+                goto fail;
+
         card->sdio_func[fn - 1] = func;
 
         return 0;
+
+fail:
+        /*
+         * It is okay to remove the function here even though we hold
+         * the host lock as we haven't registered the device yet.
+         */
+        sdio_remove_func(func);
+        return ret;
 }
 
 static int sdio_read_cccr(struct mmc_card *card)