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Subject[PATCH 1/2] input: egalax_ts: add system wakeup support
Date
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>
---
drivers/input/touchscreen/egalax_ts.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c
index 80e69bb..74984ed 100644
--- a/drivers/input/touchscreen/egalax_ts.c
+++ b/drivers/input/touchscreen/egalax_ts.c
@@ -164,6 +164,7 @@ static int egalax_firmware_version(struct i2c_client *client)
static int egalax_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ struct device_node *np = client->dev.of_node;
struct egalax_ts *ts;
struct input_dev *input_dev;
int error;
@@ -224,6 +225,9 @@ static int egalax_ts_probe(struct i2c_client *client,
if (error)
return error;

+ if (of_property_read_bool(np, "wakeup-source"))
+ device_init_wakeup(&client->dev, true);
+
return 0;
}

@@ -241,6 +245,9 @@ 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 +256,9 @@ static int __maybe_unused egalax_ts_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);

+ if (device_may_wakeup(dev))
+ return 0;
+
return egalax_wake_up_device(client);
}

--
2.7.4
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