diff options
| -rw-r--r-- | sound/soc/codecs/wm8940.c | 11 | ||||
| -rw-r--r-- | sound/soc/codecs/wm8940.h | 3 |
2 files changed, 14 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8940.c b/sound/soc/codecs/wm8940.c index 1b02d5e8a007..8eb4782c9232 100644 --- a/sound/soc/codecs/wm8940.c +++ b/sound/soc/codecs/wm8940.c @@ -760,6 +760,17 @@ static int wm8940_probe(struct snd_soc_component *component) int ret; u16 reg; + /* + * Check chip ID for wm8940 - value of 0x00 offset + * SOFTWARE_RESET on write + * CHIP_ID on read + */ + reg = snd_soc_component_read(component, WM8940_SOFTRESET); + if (reg != WM8940_CHIP_ID) { + dev_err(component->dev, "Wrong wm8940 chip ID: 0x%x\n", reg); + return -ENODEV; + } + ret = wm8940_reset(component); if (ret < 0) { dev_err(component->dev, "Failed to issue reset\n"); diff --git a/sound/soc/codecs/wm8940.h b/sound/soc/codecs/wm8940.h index 0d4f53ada2e6..86bbf902ef5a 100644 --- a/sound/soc/codecs/wm8940.h +++ b/sound/soc/codecs/wm8940.h @@ -95,5 +95,8 @@ struct wm8940_setup_data { #define WM8940_OPCLKDIV_3 2 #define WM8940_OPCLKDIV_4 3 +/* Chip ID */ +#define WM8940_CHIP_ID 0x8940 + #endif /* _WM8940_H */ |