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authorMark Brown <broonie@linaro.org>2013-11-22 13:34:48 +0000
committerMark Brown <broonie@linaro.org>2013-11-24 13:53:27 +0000
commita0a05916cf67a007f4ee0071fd0fa04e45137a38 (patch)
tree6241107da319e8551b953398673f0cd405c897f9 /sound/soc/codecs/wm8991.c
parente4634804cacce6fe1ec34d92786f764fcb75cb97 (diff)
downloadlinux-a0a05916cf67a007f4ee0071fd0fa04e45137a38.tar.bz2
ASoC: wm8991: Verify device ID during probe()
Just in case. Signed-off-by: Mark Brown <broonie@linaro.org> Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Diffstat (limited to 'sound/soc/codecs/wm8991.c')
-rw-r--r--sound/soc/codecs/wm8991.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8991.c b/sound/soc/codecs/wm8991.c
index 5fdcf788e990..dba0306c42a5 100644
--- a/sound/soc/codecs/wm8991.c
+++ b/sound/soc/codecs/wm8991.c
@@ -1335,6 +1335,7 @@ static int wm8991_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8991_priv *wm8991;
+ unsigned int val;
int ret;
wm8991 = devm_kzalloc(&i2c->dev, sizeof(*wm8991), GFP_KERNEL);
@@ -1347,6 +1348,16 @@ static int wm8991_i2c_probe(struct i2c_client *i2c,
i2c_set_clientdata(i2c, wm8991);
+ ret = regmap_read(wm8991->regmap, WM8991_RESET, &val);
+ if (ret != 0) {
+ dev_err(&i2c->dev, "Failed to read device ID: %d\n", ret);
+ return ret;
+ }
+ if (val != 0x8991) {
+ dev_err(&i2c->dev, "Device with ID %x is not a WM8991\n", val);
+ return -EINVAL;
+ }
+
ret = regmap_write(wm8991->regmap, WM8991_RESET, 0);
if (ret < 0) {
dev_err(&i2c->dev, "Failed to issue reset: %d\n", ret);