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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>
This commit is contained in:
Dmitry Torokhov 2014-12-19 12:57:49 -08:00
parent c3f6f8612b
commit c5928551fd
1 changed files with 7 additions and 0 deletions
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7
drivers/input/mouse/elan_i2c_core.c
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@ -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)