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authorAnton Vorontsov <avorontsov@ru.mvista.com>2008-06-17 10:17:15 -0400
committerPierre Ossman <drzeus@drzeus.cx>2008-07-15 08:14:41 -0400
commit28f52482b41edc88cdf575aa6ed414c6e116ce10 (patch)
tree541acd881953e43113f3653ac482a83ab7afa017 /include/linux/mmc/host.h
parent150a55683b6b0ccb66aae75a10a3a514340c7c03 (diff)
mmc: add support for card-detection polling
Some hosts (and boards that use mmc_spi) do not use interrupts on the CD line, so they can't trigger mmc_detect_change. We want to poll the card and see if there was a change. 1 second poll interval seems resonable. This patch also implements .get_cd() host operation, that could be used by the hosts that are able to report card-detect status without need to talk MMC. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'include/linux/mmc/host.h')
-rw-r--r--include/linux/mmc/host.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 7ab962fa1d73..6188e19d2331 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -51,8 +51,18 @@ struct mmc_ios {
51 51
52struct mmc_host_ops { 52struct mmc_host_ops {
53 void (*request)(struct mmc_host *host, struct mmc_request *req); 53 void (*request)(struct mmc_host *host, struct mmc_request *req);
54 /*
55 * Avoid calling these three functions too often or in a "fast path",
56 * since underlaying controller might implement them in an expensive
57 * and/or slow way.
58 *
59 * Also note that these functions might sleep, so don't call them
60 * in the atomic contexts!
61 */
54 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios); 62 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
55 int (*get_ro)(struct mmc_host *host); 63 int (*get_ro)(struct mmc_host *host);
64 int (*get_cd)(struct mmc_host *host);
65
56 void (*enable_sdio_irq)(struct mmc_host *host, int enable); 66 void (*enable_sdio_irq)(struct mmc_host *host, int enable);
57}; 67};
58 68
@@ -94,6 +104,7 @@ struct mmc_host {
94#define MMC_CAP_SD_HIGHSPEED (1 << 3) /* Can do SD high-speed timing */ 104#define MMC_CAP_SD_HIGHSPEED (1 << 3) /* Can do SD high-speed timing */
95#define MMC_CAP_SDIO_IRQ (1 << 4) /* Can signal pending SDIO IRQs */ 105#define MMC_CAP_SDIO_IRQ (1 << 4) /* Can signal pending SDIO IRQs */
96#define MMC_CAP_SPI (1 << 5) /* Talks only SPI protocols */ 106#define MMC_CAP_SPI (1 << 5) /* Talks only SPI protocols */
107#define MMC_CAP_NEEDS_POLL (1 << 6) /* Needs polling for card-detection */
97 108
98 /* host specific block data */ 109 /* host specific block data */
99 unsigned int max_seg_size; /* see blk_queue_max_segment_size */ 110 unsigned int max_seg_size; /* see blk_queue_max_segment_size */