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mmc: add support for card-detection polling

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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>
This commit is contained in:
Anton Vorontsov
2008-06-17 18:17:15 +04:00
committed by Pierre Ossman
parent 150a55683b
commit 28f52482b4
2 changed files with 20 additions and 3 deletions
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12
drivers/mmc/core/core.c
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@ -638,6 +638,9 @@ void mmc_rescan(struct work_struct *work)
*/
mmc_bus_put(host);
if (host->ops->get_cd && host->ops->get_cd(host) == 0)
goto out;
mmc_claim_host(host);
mmc_power_up(host);
@ -652,7 +655,7 @@ void mmc_rescan(struct work_struct *work)
if (!err) {
if (mmc_attach_sdio(host, ocr))
mmc_power_off(host);
return;
goto out;
}
/*
@ -662,7 +665,7 @@ void mmc_rescan(struct work_struct *work)
if (!err) {
if (mmc_attach_sd(host, ocr))
mmc_power_off(host);
return;
goto out;
}
/*
@ -672,7 +675,7 @@ void mmc_rescan(struct work_struct *work)
if (!err) {
if (mmc_attach_mmc(host, ocr))
mmc_power_off(host);
return;
goto out;
}
mmc_release_host(host);
@ -683,6 +686,9 @@ void mmc_rescan(struct work_struct *work)
mmc_bus_put(host);
}
out:
if (host->caps & MMC_CAP_NEEDS_POLL)
mmc_schedule_delayed_work(&host->detect, HZ);
}
void mmc_start_host(struct mmc_host *host)