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mmc: slot-gpio: Add a function to enable/disable card detect IRQ wakeup

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Commit 03dbaa04a2 ("mmc: slot-gpio: Add support to enable irq wake on
cd_irq") enabled wakeup at initialization. However drivers may wish to
enable and disable based on different criteria. Add a helper function
mmc_gpio_set_cd_wake() to make it easy for drivers to do that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Adrian Hunter 2018-02-27 14:51:25 +02:00 committed by Ulf Hansson
parent d5d568fad9
commit 36f1d7e817
3 changed files with 23 additions and 2 deletions
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3
drivers/mmc/core/core.c
View file

@ -2655,8 +2655,7 @@ void mmc_start_host(struct mmc_host *host)
void mmc_stop_host(struct mmc_host *host)
{
if (host->slot.cd_irq >= 0) {
if (host->slot.cd_wake_enabled)
disable_irq_wake(host->slot.cd_irq);
mmc_gpio_set_cd_wake(host, false);
disable_irq(host->slot.cd_irq);
}

21
drivers/mmc/core/slot-gpio.c
View file

@ -154,6 +154,27 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
}
EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on)
{
int ret = 0;
if (!(host->caps & MMC_CAP_CD_WAKE) ||
host->slot.cd_irq < 0 ||
on == host->slot.cd_wake_enabled)
return 0;
if (on) {
ret = enable_irq_wake(host->slot.cd_irq);
host->slot.cd_wake_enabled = !ret;
} else {
disable_irq_wake(host->slot.cd_irq);
host->slot.cd_wake_enabled = false;
}
return ret;
}
EXPORT_SYMBOL(mmc_gpio_set_cd_wake);
/* Register an alternate interrupt service routine for
* the card-detect GPIO.
*/

1
include/linux/mmc/slot-gpio.h
View file

@ -31,6 +31,7 @@ int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
unsigned int debounce, bool *gpio_invert);
void mmc_gpio_set_cd_isr(struct mmc_host *host,
irqreturn_t (*isr)(int irq, void *dev_id));
int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on);
void mmc_gpiod_request_cd_irq(struct mmc_host *host);
bool mmc_can_gpio_cd(struct mmc_host *host);
bool mmc_can_gpio_ro(struct mmc_host *host);