linux-kernel - Re: [PATCH v4 6/7] Input: pixcir_i2c

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Message-ID: <20140506052148.GB2608@core.coreip.homeip.net>
Date:	Mon, 5 May 2014 22:21:48 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Roger Quadros <rogerq@...com>
Cc:	rydberg@...omail.se, balbi@...com, dmurphy@...com,
	mugunthanvnm@...com, nsekhar@...com, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 6/7] Input: pixcir_i2c_ts: Implement wakeup from
 suspend

On Mon, May 05, 2014 at 12:04:37PM +0300, Roger Quadros wrote:
> Improve the suspend and resume handlers to allow the device
> to wakeup the system from suspend.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> Acked-by: Mugunthan V N <mugunthanvnm@...com>
> ---
>  drivers/input/touchscreen/pixcir_i2c_ts.c | 53 ++++++++++++++++++++++++++++---
>  1 file changed, 49 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
> index 927aed1..5f6a27e 100644
> --- a/drivers/input/touchscreen/pixcir_i2c_ts.c
> +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
> @@ -348,21 +348,66 @@ static void pixcir_input_close(struct input_dev *dev)
>  static int pixcir_i2c_ts_suspend(struct device *dev)
>  {
>  	struct i2c_client *client = to_i2c_client(dev);
> +	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
> +	struct input_dev *input = ts->input;
> +	int ret = 0;
> +
> +	mutex_lock(&input->mutex);
> +
> +	if (input->users) {
> +		ret = pixcir_stop(ts);
> +		if (ret)
> +			goto unlock;
> +	}
> +
> +	/*
> +	 * If wakeup is enabled we need to enable interrupt generation
> +	 * but don't need to process any reports i.e. ts->exiting must be true.
> +	 */
> +	if (device_may_wakeup(&client->dev)) {
> +		/* enable wakeup interrupt generation */
> +		ret = pixcir_int_enable(ts, 1);
> +		if (ret) {
> +			dev_err(dev, "Failed to enable interrupt generation\n");
> +			goto unlock;
> +		}

I am not sure why we need to disable event processing here. Why not do

	if (device_may_wakeup(&client->dev)) {
		enable_irq_wake(client->irq); 
		ret = pixcir_int_enable(ts, true);
		...
	} else if (input->users) {
		ret = pixcir_stop(ts);
	}

like many of the drivers do?

Thanks.

-- 
Dmitry
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