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

[bardliao at realtek.com]

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)
 			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;
-- 
1.8.1.1.439.g50a6b54