[PATCH RFC] ASoC: wm8994: Avoid attempts to read unreadable registers

[Sylwester Nawrocki]

The driver supports WM1811, WM8994, WM8958 devices but according to
documentation and the regmap definitions the WM8958_DSP2_* registers
are only available on WM8958. In current code these registers are
being accessed as if they were available on all the three chips.

When starting playback on WM1811 CODEC multiple errors like:
"wm8994-codec wm8994-codec: ASoC: error at soc_component_read_no_lock on wm8994-codec: -5"
can be seen, which is caused by attempts to read an unavailable
WM8958_DSP2_PROGRAM register. The issue has been uncovered by recent
commit "e2329ee ASoC: soc-component: add soc_component_err()".

This patch adds a check in wm8958_aif_ev() callback so the DSP2 handling
is only done for WM8958.

Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
---
 sound/soc/codecs/wm8958-dsp2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/codecs/wm8958-dsp2.c b/sound/soc/codecs/wm8958-dsp2.c
index 68a3b48..3bce9a1 100644
--- a/sound/soc/codecs/wm8958-dsp2.c
+++ b/sound/soc/codecs/wm8958-dsp2.c
@@ -412,8 +412,12 @@ int wm8958_aif_ev(struct snd_soc_dapm_widget *w,
 		  struct snd_kcontrol *kcontrol, int event)
 {
 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
+	struct wm8994 *control = dev_get_drvdata(component->dev->parent);
 	int i;
 
+	if (control->type != WM8958)
+		return 0;
+
 	switch (event) {
 	case SND_SOC_DAPM_POST_PMU:
 	case SND_SOC_DAPM_PRE_PMU:
-- 
2.7.4