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>

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];
 

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));
 

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);

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;

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;

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;

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;