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

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Date:	Tue, 10 Dec 2013 16:03:16 -0800
From:	"Felipe F. Tonello" <eu@...ipetonello.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-input@...r.kernel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Heiko Abraham <abrahamh@....de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Felipe F. Tonello" <eu@...ipetonello.com>
Subject: [PATCH] input: egalax: Send touch end event when is about to suspend

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.

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

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