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Commit a0a05916 authored by Mark Brown's avatar Mark Brown
Browse files

ASoC: wm8991: Verify device ID during probe() 



Just in case.

Signed-off-by: default avatarMark Brown <broonie@linaro.org>
Acked-by: default avatarCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
parent e4634804

sound/soc/codecs/wm8991.c

+11 −0
Original line number Diff line number Diff line
@@ -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);