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>

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);