Commit c5928551 authored Dec 19, 2014 by Dmitry Torokhov

Input: elan_i2c - check if device is there before really probing



Before trying to properly initialize the touchpad and generate bunch of
errors, let's first see it there is anything at the given address. If we
get error, fail silently with -ENXIO.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

parent c3f6f861

drivers/input/mouse/elan_i2c_core.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -1077,6 +1077,13 @@ static int elan_probe(struct i2c_client *client,
		return error;
		}

		/* Make sure there is something at this address */
		error = i2c_smbus_read_byte(client);
		if (error < 0) {
		dev_dbg(&client->dev, "nothing at this address: %d\n", error);
		return -ENXIO;
		}

		/* Initialize the touchpad. */
		error = elan_initialize(data);
		if (error)

Admin message