From: Bard Liao bardliao@realtek.com

We may read an unexpected value when detemining which codec is attached. In that case, either a unsupported codec is attached or something wrong with I2C. The driver will not work properly on both cases. So we return an error for that.

Signed-off-by: Bard Liao bardliao@realtek.com --- sound/soc/codecs/rt5640.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c index b0967df..9e0d48f 100644 --- a/sound/soc/codecs/rt5640.c +++ b/sound/soc/codecs/rt5640.c @@ -2019,6 +2019,10 @@ static int rt5640_probe(struct snd_soc_codec *codec) rt5639_specific_dapm_routes, ARRAY_SIZE(rt5639_specific_dapm_routes)); break; + default: + dev_err(codec->dev, + "The driver is for RT5639 RT5640 or RT5642 only\n"); + return -ENODEV; }

return 0;