The wm8960 codec is not readable, resulting in a NACK for address 0x3d (8-bit).
This can partially indicate it. For example: wm8962 codec use the same address
but is readable. This additional probe check will help prevent loading the wm8960
module incorrectly on wm8962 hardware.
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
sound/soc/codecs/wm8960.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 0d167238a369..783c85912c59 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -1415,6 +1415,7 @@ static int wm8960_i2c_probe(struct i2c_client *i2c)
struct wm8960_data *pdata = dev_get_platdata(&i2c->dev);
struct wm8960_priv *wm8960;
int ret;
+ u8 val;
wm8960 = devm_kzalloc(&i2c->dev, sizeof(struct wm8960_priv),
GFP_KERNEL);
@@ -1436,6 +1437,12 @@ static int wm8960_i2c_probe(struct i2c_client *i2c)
else if (i2c->dev.of_node)
wm8960_set_pdata_from_of(i2c, &wm8960->pdata);
+ ret = i2c_master_recv(i2c, &val, sizeof(val));
+ if (ret >= 0) {
+ dev_err(&i2c->dev, "Not wm8960, wm8960 reg can not read by i2c\n");
+ return -EINVAL;
+ }
+
ret = wm8960_reset(wm8960->regmap);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to issue reset\n");
--
2.34.1
