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

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[ Upstream commit c5928551fd ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Torokhov
2014-12-19 12:57:49 -08:00
committed by Greg Kroah-Hartman
parent b7bd99f2d1
commit 29ecdc27ab
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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@@ -1082,6 +1082,13 @@ 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)