mmc: Export internal host state through debugfs

[deliverable/linux.git] / include / linux / mmc / host.h

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 7ab962fa1d738ffd540e4a260bb6822830b802da..9c288c9098783cfc3ef1b4d6357081b7d3f44849 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -51,8 +51,30 @@ struct mmc_ios {
 
 struct mmc_host_ops {
        void    (*request)(struct mmc_host *host, struct mmc_request *req);
+       /*
+        * Avoid calling these three functions too often or in a "fast path",
+        * since underlaying controller might implement them in an expensive
+        * and/or slow way.
+        *
+        * Also note that these functions might sleep, so don't call them
+        * in the atomic contexts!
+        *
+        * Return values for the get_ro callback should be:
+        *   0 for a read/write card
+        *   1 for a read-only card
+        *   -ENOSYS when not supported (equal to NULL callback)
+        *   or a negative errno value when something bad happened
+        *
+        * Return values for the get_ro callback should be:
+        *   0 for a absent card
+        *   1 for a present card
+        *   -ENOSYS when not supported (equal to NULL callback)
+        *   or a negative errno value when something bad happened
+        */
        void    (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
        int     (*get_ro)(struct mmc_host *host);
+       int     (*get_cd)(struct mmc_host *host);
+
        void    (*enable_sdio_irq)(struct mmc_host *host, int enable);
 };
 
@@ -89,11 +111,11 @@ struct mmc_host {
        unsigned long           caps;           /* Host capabilities */
 
 #define MMC_CAP_4_BIT_DATA     (1 << 0)        /* Can the host do 4 bit transfers */
-#define MMC_CAP_MULTIWRITE     (1 << 1)        /* Can accurately report bytes sent to card on error */
-#define MMC_CAP_MMC_HIGHSPEED  (1 << 2)        /* Can do MMC high-speed timing */
-#define MMC_CAP_SD_HIGHSPEED   (1 << 3)        /* Can do SD high-speed timing */
-#define MMC_CAP_SDIO_IRQ       (1 << 4)        /* Can signal pending SDIO IRQs */
-#define MMC_CAP_SPI            (1 << 5)        /* Talks only SPI protocols */
+#define MMC_CAP_MMC_HIGHSPEED  (1 << 1)        /* Can do MMC high-speed timing */
+#define MMC_CAP_SD_HIGHSPEED   (1 << 2)        /* Can do SD high-speed timing */
+#define MMC_CAP_SDIO_IRQ       (1 << 3)        /* Can signal pending SDIO IRQs */
+#define MMC_CAP_SPI            (1 << 4)        /* Talks only SPI protocols */
+#define MMC_CAP_NEEDS_POLL     (1 << 5)        /* Needs polling for card-detection */
 
        /* host specific block data */
        unsigned int            max_seg_size;   /* see blk_queue_max_segment_size */
@@ -135,6 +157,8 @@ struct mmc_host {
        struct led_trigger      *led;           /* activity led */
 #endif
 
+       struct dentry           *debugfs_root;
+
        unsigned long           private[0] ____cacheline_aligned;
 };