On Mon, May 08, 2017 at 05:45:53PM -0700, Dmitry Torokhov wrote:
> 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.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
Reviewed-by: Guenter Roeck <li...@roeck-us.net>
> ---
>
> v2: switched over to i2c_smbus_read_byte() as Guenter suggested
>
> drivers/input/mouse/elan_i2c_core.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/input/mouse/elan_i2c_core.c
> b/drivers/input/mouse/elan_i2c_core.c
> index 5d3b53dd2fa2..3b616cb7c67f 100644
> --- a/drivers/input/mouse/elan_i2c_core.c
> +++ b/drivers/input/mouse/elan_i2c_core.c
> @@ -1091,6 +1091,13 @@ 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)
