linux-kernel - Re: [PATCH] input: egalax: Send touch end event when is about to suspend

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Date:	Sun, 15 Dec 2013 02:40:54 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"Felipe F. Tonello" <eu@...ipetonello.com>
Cc:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Heiko Abraham <abrahamh@....de>
Subject: Re: [PATCH] input: egalax: Send touch end event when is about to
 suspend

Hi Felipe,

On Tue, Dec 10, 2013 at 04:03:16PM -0800, Felipe F. Tonello wrote:
> From: "Felipe F. Tonello" <eu@...ipetonello.com>
> 
> This is useful to report for users of this device that don't know anything
> about the suspension of the device. So users will receive a touch end event
> when the device is about to suspend, making it more user friendly.
> 
> One example of users is the X Server with the evdev input driver. This patch
> make sure that the X server will propagate a touch end event to its windows.
> 

Hmm, I would argue we need to do this in input core, similarly to what
we do for the keys, so that all drivers would benefit from the change.

Thanks.

> Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
> ---
>  drivers/input/touchscreen/egalax_ts.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/egalax_ts.c b/drivers/input/touchscreen/egalax_ts.c
> index 054d225..1f21f0d 100644
> --- a/drivers/input/touchscreen/egalax_ts.c
> +++ b/drivers/input/touchscreen/egalax_ts.c
> @@ -63,6 +63,7 @@
>  struct egalax_ts {
>  	struct i2c_client		*client;
>  	struct input_dev		*input_dev;
> +	bool					ids_in_use[MAX_SUPPORT_POINTS];
>  };
>  
>  static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
> @@ -117,6 +118,8 @@ static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id)
>  	input_mt_report_pointer_emulation(input_dev, true);
>  	input_sync(input_dev);
>  
> +	ts->ids_in_use[id] = down;
> +
>  	return IRQ_HANDLED;
>  }
>  
> @@ -247,9 +250,22 @@ static int egalax_ts_suspend(struct device *dev)
>  		0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0
>  	};
>  	struct i2c_client *client = to_i2c_client(dev);
> -	int ret;
> +	struct egalax_ts *ts = i2c_get_clientdata(client);
> +	int ret, id;
>  
>  	ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN);
> +
> +	/* We send a touch end event (for the ids in use) if the egalax module is
> +	   about to be turned off. */
> +	for (id = 0; id < MAX_SUPPORT_POINTS; ++id) {
> +		if (ts->ids_in_use[id]) {
> +			input_mt_slot(ts->input_dev, id);
> +			input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, false);
> +			input_mt_report_pointer_emulation(ts->input_dev, true);
> +			input_sync(ts->input_dev);
> +		}
> +	}
> +
>  	return ret > 0 ? 0 : ret;
>  }
>  
> -- 
> 1.8.3.1
> 

-- 
Dmitry
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