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| author |   Jingle Wu <jingle.wu@emc.com.tw> | 2020-07-15 17:40:27 -0700 |
|---|---|---|
| committer |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-07-17 17:35:58 -0700 |
| commit | 77da21c5d3c698f5c9ce41d57c137244bc8b7b93 (patch) | |
| tree | fa01b092f3690d29d03aa8ec08b6951bfc4e110b /drivers/input | |
| parent | Linux 5.7 (diff) | |
| download | linux-dev-77da21c5d3c698f5c9ce41d57c137244bc8b7b93.tar.xz linux-dev-77da21c5d3c698f5c9ce41d57c137244bc8b7b93.zip | |
Input: elan_i2c - handle firmware not implementing "get pattern" command
Not all versions of firmware implement "get pattern" command. When
encountering those assume that the controllers use older pattern.
Signed-off-by: Jingle Wu <jingle.wu@emc.com.tw>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/mouse/elan_i2c_i2c.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/input/mouse/elan_i2c_i2c.c b/drivers/input/mouse/elan_i2c_i2c.c index 058b35b1f9a9..0d8a6a1b30d7 100644 --- a/drivers/input/mouse/elan_i2c_i2c.c +++ b/drivers/input/mouse/elan_i2c_i2c.c @@ -249,7 +249,13 @@ static int elan_i2c_get_pattern(struct i2c_client *client, u8 *pattern) dev_err(&client->dev, "failed to get pattern: %d\n", error); return error; } - *pattern = val[1]; + + /* + * Not all versions of firmware implement "get pattern" command. + * When this command is not implemented the device will respond + * with 0xFF 0xFF, which we will treat as "old" pattern 0. + */ + *pattern = val[0] == 0xFF && val[1] == 0xFF ? 0 : val[1]; return 0; } |