[alsa-devel] [PATCH] ASoC: rt5640: add default case for unexpected ID

bardliao at realtek.com bardliao at realtek.com
Tue May 6 09:56:06 CEST 2014

From: Bard Liao <bardliao at 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 at 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)
+	default:
+		dev_err(codec->dev,
+			"The driver is for RT5639 RT5640 or RT5642 only\n");
+		return -ENODEV;
 	return 0;

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