diff options
| author | Jingle Wu <jingle.wu@emc.com.tw> | 2020-07-15 22:25:59 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-07-17 17:35:58 -0700 |
| commit | fc7c882aa9b1643273c4bb77d31163355dcbc0b8 (patch) | |
| tree | 31346b3244c1a5149ccce84e2696b515e37183f3 /drivers/input/mouse/elan_i2c_i2c.c | |
| parent | 77da21c5d3c698f5c9ce41d57c137244bc8b7b93 (diff) | |
Input: elan_i2c - make fetching IC type of older controllers more robust
On older controllers IC type is reported in the 2nd byte of
ETP_I2C_OSM_VERSION_CMD, however if controller's firmware is not flashed
correctly it may return incorrect data. Fortunately there is also
ETP_I2C_IAP_VERSION_P0_CMD command that can be used when controller in
either normal or IAP mode, and which is guaranteed to return accurate data,
so let's use it.
Signed-off-by: Jingle Wu <jingle.wu@emc.com.tw>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/mouse/elan_i2c_i2c.c')
| -rw-r--r-- | drivers/input/mouse/elan_i2c_i2c.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/input/mouse/elan_i2c_i2c.c b/drivers/input/mouse/elan_i2c_i2c.c index 0d8a6a1b30d7..bceb4bc32697 100644 --- a/drivers/input/mouse/elan_i2c_i2c.c +++ b/drivers/input/mouse/elan_i2c_i2c.c @@ -43,6 +43,7 @@ #define ETP_I2C_RESOLUTION_CMD 0x0108 #define ETP_I2C_PRESSURE_CMD 0x010A #define ETP_I2C_IAP_VERSION_CMD 0x0110 +#define ETP_I2C_IC_TYPE_P0_CMD 0x0110 #define ETP_I2C_SET_CMD 0x0300 #define ETP_I2C_POWER_CMD 0x0307 #define ETP_I2C_FW_CHECKSUM_CMD 0x030F @@ -330,7 +331,14 @@ static int elan_i2c_get_sm_version(struct i2c_client *client, return error; } *version = val[0]; - *ic_type = val[1]; + + error = elan_i2c_read_cmd(client, ETP_I2C_IC_TYPE_P0_CMD, val); + if (error) { + dev_err(&client->dev, "failed to get ic type: %d\n", + error); + return error; + } + *ic_type = val[0]; error = elan_i2c_read_cmd(client, ETP_I2C_NSM_VERSION_CMD, val); |