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.torokhov@xxxxxxxxx>
---
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)
--
2.13.0.rc2.291.g57267f2277-goog
--
Dmitry
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