Re: [PATCH 1/2] input: egalax_ts: add system wakeup support

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Anson,

On Wed, Sep 05, 2018 at 05:26:46PM +0800, Anson Huang wrote:
> 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);

This is done in i2c core, there is no need to do it in the driver.

> +
>  	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;

This will end up with unbalanced enable_irq_wake() from suspend.

> +
>  	return egalax_wake_up_device(client);
>  }
>  
> -- 
> 2.7.4
> 

Thanks.

-- 
Dmitry