[PATCH 8/9] mmc: slot-gpio: Add a function to enable/disable card detect IRQ wakeup

Adrian Hunter
2017-12-20T08:19:33Z

Commit 03dbaa04a2e5 ("mmc: slot-gpio: Add support to enable irq wake on
cd_irq") enabled wakeup irrespective of the host controller's PM flags.
However, users also want to control it from sysfs power/wakeup attribute.
That means the driver needs to check the PM flags before enabling it in the
suspend callback. Add 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>
---
drivers/mmc/core/core.c | 3 +--
drivers/mmc/core/slot-gpio.c | 23 +++++++++++++++++++++++
include/linux/mmc/slot-gpio.h | 1 +
3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index c0ba6d8823b7..7bed23c877de 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -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);
}

diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index f7c6e0542de7..3a30535c2f31 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -154,6 +154,29 @@ 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) {
+ if (device_may_wakeup(mmc_dev(host))) {
+ 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.
*/
diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
index 82f0d289f110..1ee9f15bf2c0 100644
--- a/include/linux/mmc/slot-gpio.h
+++ b/include/linux/mmc/slot-gpio.h
@@ -33,5 +33,6 @@ void mmc_gpio_set_cd_isr(struct mmc_host *host,
irqreturn_t (*isr)(int irq, void *dev_id));
void mmc_gpiod_request_cd_irq(struct mmc_host *host);
bool mmc_can_gpio_cd(struct mmc_host *host);
+int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on);

#endif
--
1.9.1