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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>
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1 changed files with 7 additions and 1 deletions
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@ -249,7 +249,13 @@ static int elan_i2c_get_pattern(struct i2c_client *client, u8 *pattern)
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dev_err(&client->dev, "failed to get pattern: %d\n", error);
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return error;
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}
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*pattern = val[1];
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/*
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* Not all versions of firmware implement "get pattern" command.
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* When this command is not implemented the device will respond
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* with 0xFF 0xFF, which we will treat as "old" pattern 0.
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*/
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*pattern = val[0] == 0xFF && val[1] == 0xFF ? 0 : val[1];
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return 0;
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}
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