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mmc_spi: add support for card-detection polling 

This patch adds new platform data variable "caps", so platforms
could pass theirs capabilities into MMC core (for example, platforms
without interrupt on the CD line will most probably want to pass
MMC_CAP_NEEDS_POLL).

New platform get_cd() callback provided to optimize polling.

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 18:17:21 +04:00 committed by Pierre Ossman
parent 28f52482b4
commit 619ef4b421
2 changed files with 26 additions and 2 deletions
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19
drivers/mmc/host/mmc_spi.c
View File

@ -1131,11 +1131,20 @@ static int mmc_spi_get_ro(struct mmc_host *mmc)
return 0;
}
static int mmc_spi_get_cd(struct mmc_host *mmc)
{
struct mmc_spi_host *host = mmc_priv(mmc);
if (host->pdata && host->pdata->get_cd)
return !!host->pdata->get_cd(mmc->parent);
return -ENOSYS;
}
static const struct mmc_host_ops mmc_spi_ops = {
.request = mmc_spi_request,
.set_ios = mmc_spi_set_ios,
.get_ro = mmc_spi_get_ro,
.get_cd = mmc_spi_get_cd,
};
@ -1319,17 +1328,23 @@ static int mmc_spi_probe(struct spi_device *spi)
goto fail_glue_init;
}
/* pass platform capabilities, if any */
if (host->pdata)
mmc->caps |= host->pdata->caps;
status = mmc_add_host(mmc);
if (status != 0)
goto fail_add_host;
dev_info(&spi->dev, "SD/MMC host %s%s%s%s\n",
dev_info(&spi->dev, "SD/MMC host %s%s%s%s%s\n",
mmc->class_dev.bus_id,
host->dma_dev ? "" : ", no DMA",
(host->pdata && host->pdata->get_ro)
? "" : ", no WP",
(host->pdata && host->pdata->setpower)
? "" : ", no poweroff");
? "" : ", no poweroff",
(mmc->caps & MMC_CAP_NEEDS_POLL)
? ", cd polling" : "");
return 0;
fail_add_host:

9
include/linux/spi/mmc_spi.h
View File

@ -23,6 +23,15 @@ struct mmc_spi_platform_data {
/* sense switch on sd cards */
int (*get_ro)(struct device *);
/*
* If board does not use CD interrupts, driver can optimize polling
* using this function.
*/
int (*get_cd)(struct device *);
/* Capabilities to pass into mmc core (e.g. MMC_CAP_NEEDS_POLL). */
unsigned long caps;
/* how long to debounce card detect, in msecs */
u16 detect_delay;