ASoC: cs4271: add support for AMUTEB=BMUTEC feature

The CS4271 has a feature to sync its analog mute flags, so one mute
circuitry can be used for both channels.

Give users access to this feature with a new DT property and a flag in
the platform data.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/Documentation/devicetree/bindings/sound/cs4271.txt b/Documentation/devicetree/bindings/sound/cs4271.txt
index c81b5fd..a850fb9 100644 (file)
--- a/Documentation/devicetree/bindings/sound/cs4271.txt
+++ b/Documentation/devicetree/bindings/sound/cs4271.txt
@@ -18,6 +18,8 @@ Optional properties:
 
  - reset-gpio:         a GPIO spec to define which pin is connected to the chip's
                !RESET pin
+ - cirrus,amuteb-eq-bmutec:    When given, the Codec's AMUTEB=BMUTEC flag
+                               is enabled.
 
 Examples:
 

diff --git a/include/sound/cs4271.h b/include/sound/cs4271.h
index 50a059e..6d9e15e 100644 (file)
--- a/include/sound/cs4271.h
+++ b/include/sound/cs4271.h
@@ -19,6 +19,7 @@
 
 struct cs4271_platform_data {
        int gpio_nreset;        /* GPIO driving Reset pin, if any */
+       int amutec_eq_bmutec:1; /* flag to enable AMUTEC=BMUTEC */
 };
 
 #endif /* __CS4271_H */

diff --git a/sound/soc/codecs/cs4271.c b/sound/soc/codecs/cs4271.c
index f994af3..2ac5fe6 100644 (file)
--- a/sound/soc/codecs/cs4271.c
+++ b/sound/soc/codecs/cs4271.c
@@ -474,15 +474,25 @@ static int cs4271_probe(struct snd_soc_codec *codec)
        struct cs4271_platform_data *cs4271plat = codec->dev->platform_data;
        int ret;
        int gpio_nreset = -EINVAL;
+       int amutec_eq_bmutec = 0;
 
 #ifdef CONFIG_OF
-       if (of_match_device(cs4271_dt_ids, codec->dev))
+       if (of_match_device(cs4271_dt_ids, codec->dev)) {
                gpio_nreset = of_get_named_gpio(codec->dev->of_node,
                                                "reset-gpio", 0);
+
+               if (!of_get_property(codec->dev->of_node,
+                                    "cirrus,amutec-eq-bmutec", NULL))
+                       amutec_eq_bmutec = 1;
+       }
 #endif
 
-       if (cs4271plat && gpio_is_valid(cs4271plat->gpio_nreset))
-               gpio_nreset = cs4271plat->gpio_nreset;
+       if (cs4271plat) {
+               if (gpio_is_valid(cs4271plat->gpio_nreset))
+                       gpio_nreset = cs4271plat->gpio_nreset;
+
+               amutec_eq_bmutec = cs4271plat->amutec_eq_bmutec;
+       }
 
        if (gpio_nreset >= 0)
                if (gpio_request(gpio_nreset, "CS4271 Reset"))
@@ -528,6 +538,11 @@ static int cs4271_probe(struct snd_soc_codec *codec)
        /* Power-up sequence requires 85 uS */
        udelay(85);
 
+       if (amutec_eq_bmutec)
+               snd_soc_update_bits(codec, CS4271_MODE2,
+                                   CS4271_MODE2_MUTECAEQUB,
+                                   CS4271_MODE2_MUTECAEQUB);
+
        return snd_soc_add_codec_controls(codec, cs4271_snd_controls,
                ARRAY_SIZE(cs4271_snd_controls));
 }