[PATCH V2] cros_ec_keyb: Mark cros_ec_keyb driver as wake enabled device.

Ravi Chandra Sadineni
2018-05-26T01:14:56Z

Mark cros_ec_keyb has wake enabled by default. If we see a MKBP event
related to keyboard, call pm_wakeup_event() to make sure wakeup
triggers are accounted to keyb during suspend resume path.

Signed-off-by: Ravi Chandra Sadineni <ravisadineni@chromium.org>
---
V2: Marked the ckdev as wake enabled instead of input devices.

drivers/input/keyboard/cros_ec_keyb.c | 21 +++++++++++++++++----
drivers/mfd/cros_ec.c | 19 +++++++------------
2 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
index 79eb29550c348..a7c96f0317123 100644
--- a/drivers/input/keyboard/cros_ec_keyb.c
+++ b/drivers/input/keyboard/cros_ec_keyb.c
@@ -245,12 +245,17 @@ static int cros_ec_keyb_work(struct notifier_block *nb,
switch (ckdev->ec->event_data.event_type) {
case EC_MKBP_EVENT_KEY_MATRIX:
/*
- * If EC is not the wake source, discard key state changes
+ * If Keyb is not wake enabled, discard key state changes
* during suspend.
*/
- if (queued_during_suspend)
+ if (queued_during_suspend
+ && !device_may_wakeup(ckdev->dev))
return NOTIFY_OK;

+ if (device_may_wakeup(ckdev->dev))
+ pm_wakeup_event(ckdev->dev, 0);
+
+
if (ckdev->ec->event_size != ckdev->cols) {
dev_err(ckdev->dev,
"Discarded incomplete key matrix event.\n");
@@ -265,18 +270,25 @@ static int cros_ec_keyb_work(struct notifier_block *nb,
val = get_unaligned_le32(&ckdev->ec->event_data.data.sysrq);
dev_dbg(ckdev->dev, "sysrq code from EC: %#x\n", val);
handle_sysrq(val);
+
+ if (device_may_wakeup(ckdev->dev))
+ pm_wakeup_event(ckdev->dev, 0);
break;

case EC_MKBP_EVENT_BUTTON:
case EC_MKBP_EVENT_SWITCH:
/*
- * If EC is not the wake source, discard key state
+ * If keyb is not wake enabled, discard key state
* changes during suspend. Switches will be re-checked in
* cros_ec_keyb_resume() to be sure nothing is lost.
*/
- if (queued_during_suspend)
+ if (queued_during_suspend
+ && !device_may_wakeup(ckdev->dev))
return NOTIFY_OK;

+ if (device_may_wakeup(ckdev->dev))
+ pm_wakeup_event(ckdev->dev, 0);
+
if (ckdev->ec->event_data.event_type == EC_MKBP_EVENT_BUTTON) {
val = get_unaligned_le32(
&ckdev->ec->event_data.data.buttons);
@@ -639,6 +651,7 @@ static int cros_ec_keyb_probe(struct platform_device *pdev)
return err;
}

+ device_init_wakeup(ckdev->dev, true);
return 0;
}

diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index d61024141e2b6..36156a41499c9 100644
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -229,7 +229,7 @@ int cros_ec_suspend(struct cros_ec_device *ec_dev)
}
EXPORT_SYMBOL(cros_ec_suspend);

-static void cros_ec_drain_events(struct cros_ec_device *ec_dev)
+static void cros_ec_report_events_during_suspend(struct cros_ec_device *ec_dev)
{
while (cros_ec_get_next_event(ec_dev, NULL) > 0)
blocking_notifier_call_chain(&ec_dev->event_notifier,
@@ -253,21 +253,16 @@ int cros_ec_resume(struct cros_ec_device *ec_dev)
dev_dbg(ec_dev->dev, "Error %d sending resume event to ec",
ret);

- /*
- * In some cases, we need to distinguish between events that occur
- * during suspend if the EC is not a wake source. For example,
- * keypresses during suspend should be discarded if it does not wake
- * the system.
- *
- * If the EC is not a wake source, drain the event queue and mark them
- * as "queued during suspend".
- */
if (ec_dev->wake_enabled) {
disable_irq_wake(ec_dev->irq);
ec_dev->wake_enabled = 0;
- } else {
- cros_ec_drain_events(ec_dev);
}
+ /*
+ * Let the mfd devices know about events that occur during
+ * suspend. This way the clients know what to do with them.
+ */
+ cros_ec_report_events_during_suspend(ec_dev);
+

return 0;
}
--
2.17.0.921.gf22659ad46-goog