ASoC: arizona: Add support for setting the output volume limits

The output volume limits allow signals to be limited to specific levels
appropriate for the hardware attached. As this is a property of the
hardware itself these will be configured through device tree.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

7 files changed, 41 insertions, 0 deletions

diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
index bfeecf179895..f72dc53848d7 100644
--- a/include/linux/mfd/arizona/pdata.h
+++ b/include/linux/mfd/arizona/pdata.h
@@ -174,6 +174,9 @@ struct arizona_pdata {
         /** Mode for outputs */
         int out_mono[ARIZONA_MAX_OUTPUT];
 
+        /** Limit output volumes */
+        unsigned int out_vol_limit[2 * ARIZONA_MAX_OUTPUT];
+
         /** PDM speaker mute setting */
         unsigned int spk_mute[ARIZONA_MAX_PDM_SPK];
 
diff --git a/sound/soc/codecs/arizona.c b/sound/soc/codecs/arizona.c
index e6967385dccb..b3375e19598a 100644
--- a/sound/soc/codecs/arizona.c
+++ b/sound/soc/codecs/arizona.c
@@ -372,6 +372,22 @@ int arizona_init_common(struct arizona *arizona)
 }
 EXPORT_SYMBOL_GPL(arizona_init_common);
 
+int arizona_init_vol_limit(struct arizona *arizona)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(arizona->pdata.out_vol_limit); ++i) {
+                if (arizona->pdata.out_vol_limit[i])
+                        regmap_update_bits(arizona->regmap,
+                                           ARIZONA_DAC_VOLUME_LIMIT_1L + i * 4,
+                                           ARIZONA_OUT1L_VOL_LIM_MASK,
+                                           arizona->pdata.out_vol_limit[i]);
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(arizona_init_vol_limit);
+
 const char * const arizona_mixer_texts[ARIZONA_NUM_MIXER_INPUTS] = {
         "None",
         "Tone Generator 1",
@@ -2810,6 +2826,15 @@ int arizona_of_get_audio_pdata(struct arizona *arizona)
                 count++;
         }
 
+        count = 0;
+        of_property_for_each_u32(np, "wlf,out-volume-limit", prop, cur, val) {
+                if (count == ARRAY_SIZE(pdata->out_vol_limit))
+                        break;
+
+                pdata->out_vol_limit[count] = val;
+                count++;
+        }
+
         ret = of_property_read_u32_array(np, "wlf,spk-fmt",
                                          pdm_val, ARRAY_SIZE(pdm_val));
 
diff --git a/sound/soc/codecs/arizona.h b/sound/soc/codecs/arizona.h
index 2d198fb2ce97..dfdf6d8c9687 100644
--- a/sound/soc/codecs/arizona.h
+++ b/sound/soc/codecs/arizona.h
@@ -315,6 +315,7 @@ int arizona_init_gpio(struct snd_soc_codec *codec);
 int arizona_init_mono(struct snd_soc_codec *codec);
 
 int arizona_init_common(struct arizona *arizona);
+int arizona_init_vol_limit(struct arizona *arizona);
 
 int arizona_init_spk_irqs(struct arizona *arizona);
 int arizona_free_spk_irqs(struct arizona *arizona);
diff --git a/sound/soc/codecs/cs47l24.c b/sound/soc/codecs/cs47l24.c
index 0fe7d7a87ff3..94c0209977d0 100644
--- a/sound/soc/codecs/cs47l24.c
+++ b/sound/soc/codecs/cs47l24.c
@@ -1297,6 +1297,9 @@ static int cs47l24_probe(struct platform_device *pdev)
 
         arizona_init_common(arizona);
 
+        ret = arizona_init_vol_limit(arizona);
+        if (ret < 0)
+                goto err_dsp_irq;
         ret = arizona_init_spk_irqs(arizona);
         if (ret < 0)
                 goto err_dsp_irq;
diff --git a/sound/soc/codecs/wm5102.c b/sound/soc/codecs/wm5102.c
index 5a917dd73f32..4f0481d3c7a7 100644
--- a/sound/soc/codecs/wm5102.c
+++ b/sound/soc/codecs/wm5102.c
@@ -2107,6 +2107,9 @@ static int wm5102_probe(struct platform_device *pdev)
 
         arizona_init_common(arizona);
 
+        ret = arizona_init_vol_limit(arizona);
+        if (ret < 0)
+                goto err_dsp_irq;
         ret = arizona_init_spk_irqs(arizona);
         if (ret < 0)
                 goto err_dsp_irq;
diff --git a/sound/soc/codecs/wm5110.c b/sound/soc/codecs/wm5110.c
index ba1e90ca8be4..6ed1e1f9ce51 100644
--- a/sound/soc/codecs/wm5110.c
+++ b/sound/soc/codecs/wm5110.c
@@ -2463,6 +2463,9 @@ static int wm5110_probe(struct platform_device *pdev)
 
         arizona_init_common(arizona);
 
+        ret = arizona_init_vol_limit(arizona);
+        if (ret < 0)
+                goto err_dsp_irq;
         ret = arizona_init_spk_irqs(arizona);
         if (ret < 0)
                 goto err_dsp_irq;
diff --git a/sound/soc/codecs/wm8997.c b/sound/soc/codecs/wm8997.c
index c5aef9ecdecc..77f512767273 100644
--- a/sound/soc/codecs/wm8997.c
+++ b/sound/soc/codecs/wm8997.c
@@ -1176,6 +1176,9 @@ static int wm8997_probe(struct platform_device *pdev)
 
         arizona_init_common(arizona);
 
+        ret = arizona_init_vol_limit(arizona);
+        if (ret < 0)
+                return ret;
         ret = arizona_init_spk_irqs(arizona);
         if (ret < 0)
                 return ret;