mmc: core: Add card_busy to host_ops

This host_ops member is used to test if the card is signaling busy by
pulling dat[0:3] low.

Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 523d570f58ad880bc478d17acdd6266f2b54e348..0373b0a6daac4ac97dd19e7bec03b251f80d7cfe 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -131,6 +131,9 @@ struct mmc_host_ops {
 
        int     (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios);
 
+       /* Check if the card is pulling dat[0:3] low */
+       int     (*card_busy)(struct mmc_host *host);
+
        /* The tuning command opcode value is different for SD and eMMC cards */
        int     (*execute_tuning)(struct mmc_host *host, u32 opcode);
        void    (*enable_preset_value)(struct mmc_host *host, bool enable);