Input: egalax_ts - add system wakeup support

This patch adds wakeup function support for egalax touch
screen, if "wakeup-source" is added to device tree's egalax
touch screen node, the wakeup function will be enabled, and
egalax touch screen will be able to wakeup system from suspend.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c
index 80e69bb8283e..83ac8c128192 100644
--- a/drivers/input/touchscreen/egalax_ts.c
+++ b/drivers/input/touchscreen/egalax_ts.c
@@ -241,6 +241,9 @@ static int __maybe_unused egalax_ts_suspend(struct device *dev)
         struct i2c_client *client = to_i2c_client(dev);
         int ret;
 
+        if (device_may_wakeup(dev))
+                return enable_irq_wake(client->irq);
+
         ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
         return ret > 0 ? 0 : ret;
 }
@@ -249,6 +252,9 @@ static int __maybe_unused egalax_ts_resume(struct device *dev)
 {
         struct i2c_client *client = to_i2c_client(dev);
 
+        if (device_may_wakeup(dev))
+                return disable_irq_wake(client->irq);
+
         return egalax_wake_up_device(client);
 }