[05/15] ASoC: mediatek: mt8186: support hw gain in platform driver

diff --git a/sound/soc/mediatek/mt8186/mt8186-dai-hw-gain.c b/sound/soc/mediatek/mt8186/mt8186-dai-hw-gain.c
new file mode 100644
index 000000000000..9c451bdf79e9
--- /dev/null
+++ b/sound/soc/mediatek/mt8186/mt8186-dai-hw-gain.c
@@ -0,0 +1,246 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  MediaTek ALSA SoC Audio DAI HW Gain Control
+ *
+ *  Copyright (c) 2022 MediaTek Inc.
+ *  Author: Jiaxin Yu <jiaxin.yu@mediatek.com>
+ */
+
+#include <linux/regmap.h>
+#include "mt8186-afe-common.h"
+#include "mt8186-interconnection.h"
+
+#define HW_GAIN_1_EN_W_NAME "HW GAIN 1 Enable"
+#define HW_GAIN_2_EN_W_NAME "HW GAIN 2 Enable"
+
+/* dai component */
+static const struct snd_kcontrol_new mtk_hw_gain1_in_ch1_mix[] = {
+	SOC_DAPM_SINGLE_AUTODISABLE("CONNSYS_I2S_CH1", AFE_CONN13_1,
+				    I_CONNSYS_I2S_CH1, 1, 0),
+};
+
+static const struct snd_kcontrol_new mtk_hw_gain1_in_ch2_mix[] = {
+	SOC_DAPM_SINGLE_AUTODISABLE("CONNSYS_I2S_CH2", AFE_CONN14_1,
+				    I_CONNSYS_I2S_CH2, 1, 0),
+};
+
+static const struct snd_kcontrol_new mtk_hw_gain2_in_ch1_mix[] = {
+	SOC_DAPM_SINGLE_AUTODISABLE("ADDA_UL_CH1", AFE_CONN15,
+				    I_ADDA_UL_CH1, 1, 0),
+};
+
+static const struct snd_kcontrol_new mtk_hw_gain2_in_ch2_mix[] = {
+	SOC_DAPM_SINGLE_AUTODISABLE("ADDA_UL_CH2", AFE_CONN16,
+				    I_ADDA_UL_CH2, 1, 0),
+};
+
+static int mtk_hw_gain_event(struct snd_soc_dapm_widget *w,
+			     struct snd_kcontrol *kcontrol,
+			     int event)
+{
+	struct snd_soc_component *cmpnt = snd_soc_dapm_to_component(w->dapm);
+	struct mtk_base_afe *afe = snd_soc_component_get_drvdata(cmpnt);
+	unsigned int gain_cur;
+	unsigned int gain_con1;
+
+	dev_info(cmpnt->dev, "%s(), name %s, event 0x%x\n",
+		 __func__, w->name, event);
+
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		if (strcmp(w->name, HW_GAIN_1_EN_W_NAME) == 0) {
+			gain_cur = AFE_GAIN1_CUR;
+			gain_con1 = AFE_GAIN1_CON1;
+		} else {
+			gain_cur = AFE_GAIN2_CUR;
+			gain_con1 = AFE_GAIN2_CON1;
+		}
+
+		/* let hw gain ramp up, set cur gain to 0 */
+		regmap_update_bits(afe->regmap,
+				   gain_cur,
+				   AFE_GAIN1_CUR_MASK_SFT,
+				   0);
+
+		/* set target gain to 0 */
+		regmap_update_bits(afe->regmap,
+				   gain_con1,
+				   GAIN1_TARGET_MASK_SFT,
+				   0);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dapm_widget mtk_dai_hw_gain_widgets[] = {
+	/* inter-connections */
+	SND_SOC_DAPM_MIXER("HW_GAIN1_IN_CH1", SND_SOC_NOPM, 0, 0,
+			   mtk_hw_gain1_in_ch1_mix,
+			   ARRAY_SIZE(mtk_hw_gain1_in_ch1_mix)),
+	SND_SOC_DAPM_MIXER("HW_GAIN1_IN_CH2", SND_SOC_NOPM, 0, 0,
+			   mtk_hw_gain1_in_ch2_mix,
+			   ARRAY_SIZE(mtk_hw_gain1_in_ch2_mix)),
+	SND_SOC_DAPM_MIXER("HW_GAIN2_IN_CH1", SND_SOC_NOPM, 0, 0,
+			   mtk_hw_gain2_in_ch1_mix,
+			   ARRAY_SIZE(mtk_hw_gain2_in_ch1_mix)),
+	SND_SOC_DAPM_MIXER("HW_GAIN2_IN_CH2", SND_SOC_NOPM, 0, 0,
+			   mtk_hw_gain2_in_ch2_mix,
+			   ARRAY_SIZE(mtk_hw_gain2_in_ch2_mix)),
+
+	SND_SOC_DAPM_SUPPLY(HW_GAIN_1_EN_W_NAME,
+			    AFE_GAIN1_CON0, GAIN1_ON_SFT, 0,
+			    mtk_hw_gain_event,
+			    SND_SOC_DAPM_PRE_PMU),
+
+	SND_SOC_DAPM_SUPPLY(HW_GAIN_2_EN_W_NAME,
+			    AFE_GAIN2_CON0, GAIN2_ON_SFT, 0,
+			    mtk_hw_gain_event,
+			    SND_SOC_DAPM_PRE_PMU),
+
+	SND_SOC_DAPM_INPUT("HW Gain 1 Out Endpoint"),
+	SND_SOC_DAPM_INPUT("HW Gain 2 Out Endpoint"),
+	SND_SOC_DAPM_OUTPUT("HW Gain 1 In Endpoint"),
+};
+
+static const struct snd_soc_dapm_route mtk_dai_hw_gain_routes[] = {
+	{"HW Gain 1 In", NULL, "HW_GAIN1_IN_CH1"},
+	{"HW Gain 1 In", NULL, "HW_GAIN1_IN_CH2"},
+	{"HW Gain 2 In", NULL, "HW_GAIN2_IN_CH1"},
+	{"HW Gain 2 In", NULL, "HW_GAIN2_IN_CH2"},
+
+	{"HW Gain 1 In", NULL, HW_GAIN_1_EN_W_NAME},
+	{"HW Gain 1 Out", NULL, HW_GAIN_1_EN_W_NAME},
+	{"HW Gain 2 In", NULL, HW_GAIN_2_EN_W_NAME},
+	{"HW Gain 2 Out", NULL, HW_GAIN_2_EN_W_NAME},
+
+	{"HW Gain 1 In Endpoint", NULL, "HW Gain 1 In"},
+	{"HW Gain 1 Out", NULL, "HW Gain 1 Out Endpoint"},
+	{"HW Gain 2 Out", NULL, "HW Gain 2 Out Endpoint"},
+};
+
+static const struct snd_kcontrol_new mtk_hw_gain_controls[] = {
+	SOC_SINGLE("HW Gain 1", AFE_GAIN1_CON1,
+		   GAIN1_TARGET_SFT, GAIN1_TARGET_MASK, 0),
+	SOC_SINGLE("HW Gain 2", AFE_GAIN2_CON1,
+		   GAIN2_TARGET_SFT, GAIN2_TARGET_MASK, 0),
+};
+
+/* dai ops */
+static int mtk_dai_gain_hw_params(struct snd_pcm_substream *substream,
+				  struct snd_pcm_hw_params *params,
+				  struct snd_soc_dai *dai)
+{
+	struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
+	unsigned int rate = params_rate(params);
+	unsigned int rate_reg = mt8186_rate_transform(afe->dev, rate, dai->id);
+
+	dev_info(afe->dev, "%s(), id %d, stream %d, rate %d\n",
+		 __func__,
+		 dai->id,
+		 substream->stream,
+		 rate);
+
+	/* rate */
+	regmap_update_bits(afe->regmap,
+			   dai->id == MT8186_DAI_HW_GAIN_1 ?
+			   AFE_GAIN1_CON0 : AFE_GAIN2_CON0,
+			   GAIN1_MODE_MASK_SFT,
+			   rate_reg << GAIN1_MODE_SFT);
+
+	/* sample per step */
+	regmap_update_bits(afe->regmap,
+			   dai->id == MT8186_DAI_HW_GAIN_1 ?
+			   AFE_GAIN1_CON0 : AFE_GAIN2_CON0,
+			   GAIN1_SAMPLE_PER_STEP_MASK_SFT,
+			   (dai->id == MT8186_DAI_HW_GAIN_1 ? 0x40 : 0x0) <<
+			   GAIN1_SAMPLE_PER_STEP_SFT);
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops mtk_dai_gain_ops = {
+	.hw_params = mtk_dai_gain_hw_params,
+};
+
+/* dai driver */
+#define MTK_HW_GAIN_RATES (SNDRV_PCM_RATE_8000_48000 |\
+			   SNDRV_PCM_RATE_88200 |\
+			   SNDRV_PCM_RATE_96000 |\
+			   SNDRV_PCM_RATE_176400 |\
+			   SNDRV_PCM_RATE_192000)
+
+#define MTK_HW_GAIN_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
+			     SNDRV_PCM_FMTBIT_S24_LE |\
+			     SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_driver mtk_dai_gain_driver[] = {
+	{
+		.name = "HW Gain 1",
+		.id = MT8186_DAI_HW_GAIN_1,
+		.playback = {
+			.stream_name = "HW Gain 1 In",
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = MTK_HW_GAIN_RATES,
+			.formats = MTK_HW_GAIN_FORMATS,
+		},
+		.capture = {
+			.stream_name = "HW Gain 1 Out",
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = MTK_HW_GAIN_RATES,
+			.formats = MTK_HW_GAIN_FORMATS,
+		},
+		.ops = &mtk_dai_gain_ops,
+		.symmetric_rate = 1,
+		.symmetric_channels = 1,
+		.symmetric_sample_bits = 1,
+	},
+	{
+		.name = "HW Gain 2",
+		.id = MT8186_DAI_HW_GAIN_2,
+		.playback = {
+			.stream_name = "HW Gain 2 In",
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = MTK_HW_GAIN_RATES,
+			.formats = MTK_HW_GAIN_FORMATS,
+		},
+		.capture = {
+			.stream_name = "HW Gain 2 Out",
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = MTK_HW_GAIN_RATES,
+			.formats = MTK_HW_GAIN_FORMATS,
+		},
+		.ops = &mtk_dai_gain_ops,
+		.symmetric_rate = 1,
+		.symmetric_channels = 1,
+		.symmetric_sample_bits = 1,
+	},
+};
+
+int mt8186_dai_hw_gain_register(struct mtk_base_afe *afe)
+{
+	struct mtk_base_afe_dai *dai;
+
+	dai = devm_kzalloc(afe->dev, sizeof(*dai), GFP_KERNEL);
+	if (!dai)
+		return -ENOMEM;
+
+	list_add(&dai->list, &afe->sub_dais);
+
+	dai->dai_drivers = mtk_dai_gain_driver;
+	dai->num_dai_drivers = ARRAY_SIZE(mtk_dai_gain_driver);
+
+	dai->controls = mtk_hw_gain_controls;
+	dai->num_controls = ARRAY_SIZE(mtk_hw_gain_controls);
+	dai->dapm_widgets = mtk_dai_hw_gain_widgets;
+	dai->num_dapm_widgets = ARRAY_SIZE(mtk_dai_hw_gain_widgets);
+	dai->dapm_routes = mtk_dai_hw_gain_routes;
+	dai->num_dapm_routes = ARRAY_SIZE(mtk_dai_hw_gain_routes);
+	return 0;
+}