MMC: add weak function to detect MMC/SD card
Most controllers can check if there is a card in the slot.
However, they require pins that could be not available because
required by other functions and the detection of a card must
be performed in another way. This patch adds a weak function
that a board can implement to add its internal custom way
to check the presence of a MMC/SD card.
Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index d91b9b7..3679225 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -36,6 +36,13 @@
static struct list_head mmc_devices;
static int cur_dev_num = -1;
+int __board_mmc_getcd(u8 *cd, struct mmc *mmc) {
+ return -1;
+}
+
+int board_mmc_getcd(u8 *cd, struct mmc *mmc)__attribute__((weak,
+ alias("__board_mmc_getcd")));
+
int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
return mmc->send_cmd(mmc, cmd, data);
diff --git a/include/mmc.h b/include/mmc.h
index 2dc69ab..8973bc7 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -272,6 +272,7 @@
int mmc_read(struct mmc *mmc, u64 src, uchar *dst, int size);
struct mmc *find_mmc_device(int dev_num);
void print_mmc_devices(char separator);
+int board_mmc_getcd(u8 *cd, struct mmc *mmc);
#ifndef CONFIG_GENERIC_MMC
int mmc_legacy_init(int verbose);