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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2014-12-19 12:57:49 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-13 19:50:04 +0200
commit29ecdc27ab23dee219035645c2fe6f4ec9b136b7 (patch)
tree57aeeb5b7dce05405ea36879ee6d5969eeffcaeb /drivers/input
parentb7bd99f2d1036ddcdb73b771aca5f2e6b4cde748 (diff)
Input: elan_i2c - check if device is there before really probing
[ Upstream commit c5928551fd41b2eecdad78fa2be2a4a13ed5fde9 ] 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>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/mouse/elan_i2c_core.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index c9d491bc85e0..3851d5715772 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -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)