ASoC: cs35l41: Support external boost

Add support for external boost voltage, where GPIO1 must control a
switch to isolate CS35L41 from the external Boost Voltage

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220413083728.10730-17-tanureal@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Author: Lucas Tanure

include/sound/cs35l41.h

@@ -701,6 +701,8 @@
 #define CS35L41_GPIO1_CTRL_SHIFT	16
 #define CS35L41_GPIO2_CTRL_MASK		0x07000000
 #define CS35L41_GPIO2_CTRL_SHIFT	24
+#define CS35L41_GPIO_LVL_SHIFT		15
+#define CS35L41_GPIO_LVL_MASK		BIT(CS35L41_GPIO_LVL_SHIFT)
 #define CS35L41_GPIO_POL_MASK		0x1000
 #define CS35L41_GPIO_POL_SHIFT		12
 
@@ -802,8 +804,6 @@ int cs35l41_register_errata_patch(struct device *dev, struct regmap *reg, unsign
 int cs35l41_set_channels(struct device *dev, struct regmap *reg,
 			 unsigned int tx_num, unsigned int *tx_slot,
 			 unsigned int rx_num, unsigned int *rx_slot);
-int cs35l41_boost_config(struct device *dev, struct regmap *regmap, int boost_ind, int boost_cap,
-			 int boost_ipk);
 int cs35l41_gpio_config(struct regmap *regmap, struct cs35l41_hw_cfg *hw_cfg);
 int cs35l41_init_boost(struct device *dev, struct regmap *regmap,
 		       struct cs35l41_hw_cfg *hw_cfg);

sound/soc/codecs/cs35l41-lib.c

@@ -954,8 +954,8 @@ static const unsigned char cs35l41_bst_slope_table[4] = {
 	0x75, 0x6B, 0x3B, 0x28
 };
 
-int cs35l41_boost_config(struct device *dev, struct regmap *regmap, int boost_ind,
-			 int boost_cap, int boost_ipk)
+static int cs35l41_boost_config(struct device *dev, struct regmap *regmap, int boost_ind,
+				int boost_cap, int boost_ipk)
 {
 	unsigned char bst_lbst_val, bst_cbst_range, bst_ipk_scaled;
 	int ret;
@@ -1040,7 +1040,6 @@ int cs35l41_boost_config(struct device *dev, struct regmap *regmap, int boost_in
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(cs35l41_boost_config);
 
 static const struct reg_sequence cs35l41_safe_to_reset[] = {
 	{ 0x00000040,			0x00000055 },

sound/soc/codecs/cs35l41.c

@@ -578,15 +578,10 @@ static int cs35l41_main_amp_event(struct snd_soc_dapm_widget *w,
 						cs35l41_pup_patch,
 						ARRAY_SIZE(cs35l41_pup_patch));
 
-		regmap_update_bits(cs35l41->regmap, CS35L41_PWR_CTRL1,
-				   CS35L41_GLOBAL_EN_MASK,
-				   1 << CS35L41_GLOBAL_EN_SHIFT);
-
-		usleep_range(1000, 1100);
+		cs35l41_global_enable(cs35l41->regmap, cs35l41->hw_cfg.bst_type, 1);
 		break;
 	case SND_SOC_DAPM_POST_PMD:
-		regmap_update_bits(cs35l41->regmap, CS35L41_PWR_CTRL1,
-				   CS35L41_GLOBAL_EN_MASK, 0);
+		cs35l41_global_enable(cs35l41->regmap, cs35l41->hw_cfg.bst_type, 0);
 
 		ret = regmap_read_poll_timeout(cs35l41->regmap, CS35L41_IRQ1_STATUS1,
 					       val, val &  CS35L41_PDN_DONE_MASK,
@@ -1001,13 +996,13 @@ static int cs35l41_set_pdata(struct cs35l41_private *cs35l41)
 	if (!hw_cfg->valid)
 		return -EINVAL;
 
+	if (hw_cfg->bst_type == CS35L41_EXT_BOOST_NO_VSPK_SWITCH)
+		return -EINVAL;
+
 	/* Required */
-	ret = cs35l41_boost_config(cs35l41->dev, cs35l41->regmap,
-				   hw_cfg->bst_ind, hw_cfg->bst_cap, hw_cfg->bst_ipk);
-	if (ret) {
-		dev_err(cs35l41->dev, "Error in Boost DT config: %d\n", ret);
+	ret = cs35l41_init_boost(cs35l41->dev, cs35l41->regmap, hw_cfg);
+	if (ret)
 		return ret;
-	}
 
 	/* Optional */
 	if (hw_cfg->dout_hiz <= CS35L41_ASP_DOUT_HIZ_MASK && hw_cfg->dout_hiz >= 0)
@@ -1017,9 +1012,31 @@ static int cs35l41_set_pdata(struct cs35l41_private *cs35l41)
 	return 0;
 }
 
+static const struct snd_soc_dapm_route cs35l41_ext_bst_routes[] = {
+	{"Main AMP", NULL, "VSPK"},
+};
+
+static const struct snd_soc_dapm_widget cs35l41_ext_bst_widget[] = {
+	SND_SOC_DAPM_SUPPLY("VSPK", CS35L41_GPIO1_CTRL1, CS35L41_GPIO_LVL_SHIFT, 0, NULL, 0),
+};
+
 static int cs35l41_component_probe(struct snd_soc_component *component)
 {
 	struct cs35l41_private *cs35l41 = snd_soc_component_get_drvdata(component);
+	struct snd_soc_dapm_context *dapm = snd_soc_component_get_dapm(component);
+	int ret;
+
+	if (cs35l41->hw_cfg.bst_type == CS35L41_EXT_BOOST) {
+		ret = snd_soc_dapm_new_controls(dapm, cs35l41_ext_bst_widget,
+						ARRAY_SIZE(cs35l41_ext_bst_widget));
+		if (ret)
+			return ret;
+
+		ret = snd_soc_dapm_add_routes(dapm, cs35l41_ext_bst_routes,
+					      ARRAY_SIZE(cs35l41_ext_bst_routes));
+		if (ret)
+			return ret;
+	}
 
 	return wm_adsp2_component_probe(&cs35l41->dsp, component);
 }
@@ -1084,6 +1101,10 @@ static int cs35l41_handle_pdata(struct device *dev, struct cs35l41_hw_cfg *hw_cf
 	unsigned int val;
 	int ret;
 
+	ret = device_property_read_u32(dev, "cirrus,boost-type", &val);
+	if (ret >= 0)
+		hw_cfg->bst_type = val;
+
 	ret = device_property_read_u32(dev, "cirrus,boost-peak-milliamp", &val);
 	if (ret >= 0)
 		hw_cfg->bst_ipk = val;
@@ -1376,6 +1397,7 @@ int cs35l41_probe(struct cs35l41_private *cs35l41, const struct cs35l41_hw_cfg *
 
 	wm_adsp2_remove(&cs35l41->dsp);
 err:
+	cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type);
 	regulator_bulk_disable(CS35L41_NUM_SUPPLIES, cs35l41->supplies);
 	gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
 
@@ -1390,6 +1412,7 @@ void cs35l41_remove(struct cs35l41_private *cs35l41)
 
 	regmap_write(cs35l41->regmap, CS35L41_IRQ1_MASK1, 0xFFFFFFFF);
 	wm_adsp2_remove(&cs35l41->dsp);
+	cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type);
 
 	pm_runtime_put_noidle(cs35l41->dev);
 
@@ -1409,6 +1432,7 @@ static int __maybe_unused cs35l41_runtime_suspend(struct device *dev)
 
 	dev_dbg(cs35l41->dev, "Enter hibernate\n");
 
+	cs35l41_safe_reset(cs35l41->regmap, cs35l41->hw_cfg.bst_type);
 	regmap_write(cs35l41->regmap, CS35L41_WAKESRC_CTL, 0x0088);
 	regmap_write(cs35l41->regmap, CS35L41_WAKESRC_CTL, 0x0188);
 
@@ -1505,6 +1529,7 @@ static int __maybe_unused cs35l41_runtime_resume(struct device *dev)
 		dev_err(cs35l41->dev, "Failed to restore register cache: %d\n", ret);
 		return ret;
 	}
+	cs35l41_init_boost(cs35l41->dev, cs35l41->regmap, &cs35l41->hw_cfg);
 
 	return 0;
 }