ASoC: rt5663: Add the function of impedance sensing

Support the function of impedance sensing. It could be set the matrix row
number of the impedance sensing table and the related parameters in the
DTS.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 233 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/sound/rt5663.txt b/Documentation/devicetree/bindings/sound/rt5663.txt
index ff38171..497bcfc 100644
--- a/Documentation/devicetree/bindings/sound/rt5663.txt
+++ b/Documentation/devicetree/bindings/sound/rt5663.txt
@@ -19,6 +19,22 @@ Optional properties:
   Based on the different PCB layout, add the manual offset value to
   compensate the DC offset for each L and R channel, and they are different
   between headphone and headset.
+- "realtek,impedance_sensing_num"
+  The matrix row number of the impedance sensing table.
+  If the value is 0, it means the impedance sensing is not supported.
+- "realtek,impedance_sensing_table"
+  The matrix rows of the impedance sensing table are consisted by impedance
+  minimum, impedance maximun, volume, DC offset w/o and w/ mic of each L and
+  R channel accordingly. Example is shown as following.
+  <   0    300  7  0xffd160  0xffd1c0  0xff8a10  0xff8ab0
+    301  65535  4  0xffe470  0xffe470  0xffb8e0  0xffb8e0>
+  The first and second column are defined for the impedance range. If the
+  detected impedance value is in the range, then the volume value of the
+  third column will be set to codec. In our codec design, each volume value
+  should compensate different DC offset to avoid the pop sound, and it is
+  also different between headphone and headset. In the example, the
+  "realtek,impedance_sensing_num" is 2. It means that there are 2 ranges of
+  impedance in the impedance sensing function.
 
 Pins on the device (for linking into audio routes) for RT5663:
 
diff --git a/include/sound/rt5663.h b/include/sound/rt5663.h
index 7d00e58..7b90a8f 100644
--- a/include/sound/rt5663.h
+++ b/include/sound/rt5663.h
@@ -16,6 +16,9 @@ struct rt5663_platform_data {
 	unsigned int dc_offset_r_manual;
 	unsigned int dc_offset_l_manual_mic;
 	unsigned int dc_offset_r_manual_mic;
+
+	unsigned int impedance_sensing_num;
+	unsigned int *impedance_sensing_table;
 };
 
 #endif
diff --git a/sound/soc/codecs/rt5663.c b/sound/soc/codecs/rt5663.c
index ab9e0eb..767f219 100644
--- a/sound/soc/codecs/rt5663.c
+++ b/sound/soc/codecs/rt5663.c
@@ -38,6 +38,16 @@ enum {
 	CODEC_VER_0,
 };
 
+struct impedance_mapping_table {
+	unsigned int imp_min;
+	unsigned int imp_max;
+	unsigned int vol;
+	unsigned int dc_offset_l_manual;
+	unsigned int dc_offset_r_manual;
+	unsigned int dc_offset_l_manual_mic;
+	unsigned int dc_offset_r_manual_mic;
+};
+
 struct rt5663_priv {
 	struct snd_soc_codec *codec;
 	struct rt5663_platform_data pdata;
@@ -45,6 +55,7 @@ struct rt5663_priv {
 	struct delayed_work jack_detect_work;
 	struct snd_soc_jack *hs_jack;
 	struct timer_list btn_check_timer;
+	struct impedance_mapping_table *imp_table;
 
 	int codec_ver;
 	int sysclk;
@@ -1575,6 +1586,9 @@ static int rt5663_jack_detect(struct snd_soc_codec *codec, int jack_insert)
 			rt5663->jack_type = SND_JACK_HEADSET;
 			rt5663_enable_push_button_irq(codec, true);
 
+			if (rt5663->pdata.impedance_sensing_num)
+				break;
+
 			if (rt5663->pdata.dc_offset_l_manual_mic) {
 				regmap_write(rt5663->regmap, RT5663_MIC_DECRO_2,
 					rt5663->pdata.dc_offset_l_manual_mic >>
@@ -1596,6 +1610,9 @@ static int rt5663_jack_detect(struct snd_soc_codec *codec, int jack_insert)
 		default:
 			rt5663->jack_type = SND_JACK_HEADPHONE;
 
+			if (rt5663->pdata.impedance_sensing_num)
+				break;
+
 			if (rt5663->pdata.dc_offset_l_manual) {
 				regmap_write(rt5663->regmap, RT5663_MIC_DECRO_2,
 					rt5663->pdata.dc_offset_l_manual >> 16);
@@ -1623,6 +1640,177 @@ static int rt5663_jack_detect(struct snd_soc_codec *codec, int jack_insert)
 	return rt5663->jack_type;
 }
 
+static int rt5663_impedance_sensing(struct snd_soc_codec *codec)
+{
+	struct rt5663_priv *rt5663 = snd_soc_codec_get_drvdata(codec);
+	unsigned int value, i, reg84, reg26, reg2fa, reg91, reg10, reg80;
+
+	for (i = 0; i < rt5663->pdata.impedance_sensing_num; i++) {
+		if (rt5663->imp_table[i].vol == 7)
+			break;
+	}
+
+	if (rt5663->jack_type == SND_JACK_HEADSET) {
+		snd_soc_write(codec, RT5663_MIC_DECRO_2,
+			rt5663->imp_table[i].dc_offset_l_manual_mic >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_3,
+			rt5663->imp_table[i].dc_offset_l_manual_mic & 0xffff);
+		snd_soc_write(codec, RT5663_MIC_DECRO_5,
+			rt5663->imp_table[i].dc_offset_r_manual_mic >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_6,
+			rt5663->imp_table[i].dc_offset_r_manual_mic & 0xffff);
+	} else {
+		snd_soc_write(codec, RT5663_MIC_DECRO_2,
+			rt5663->imp_table[i].dc_offset_l_manual >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_3,
+			rt5663->imp_table[i].dc_offset_l_manual & 0xffff);
+		snd_soc_write(codec, RT5663_MIC_DECRO_5,
+			rt5663->imp_table[i].dc_offset_r_manual >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_6,
+			rt5663->imp_table[i].dc_offset_r_manual & 0xffff);
+	}
+
+	reg84 = snd_soc_read(codec, RT5663_ASRC_2);
+	reg26 = snd_soc_read(codec, RT5663_STO1_ADC_MIXER);
+	reg2fa = snd_soc_read(codec, RT5663_DUMMY_1);
+	reg91 = snd_soc_read(codec, RT5663_HP_CHARGE_PUMP_1);
+	reg10 = snd_soc_read(codec, RT5663_RECMIX);
+	reg80 = snd_soc_read(codec, RT5663_GLB_CLK);
+
+	snd_soc_update_bits(codec, RT5663_STO_DRE_1, 0x8000, 0);
+	snd_soc_write(codec, RT5663_ASRC_2, 0);
+	snd_soc_write(codec, RT5663_STO1_ADC_MIXER, 0x4040);
+	snd_soc_update_bits(codec, RT5663_PWR_ANLG_1,
+		RT5663_PWR_VREF1_MASK | RT5663_PWR_VREF2_MASK |
+		RT5663_PWR_FV1_MASK | RT5663_PWR_FV2_MASK,
+		RT5663_PWR_VREF1 | RT5663_PWR_VREF2);
+	usleep_range(10000, 10005);
+	snd_soc_update_bits(codec, RT5663_PWR_ANLG_1,
+		RT5663_PWR_FV1_MASK | RT5663_PWR_FV2_MASK,
+		RT5663_PWR_FV1 | RT5663_PWR_FV2);
+	snd_soc_update_bits(codec, RT5663_GLB_CLK, RT5663_SCLK_SRC_MASK,
+		RT5663_SCLK_SRC_RCCLK);
+	snd_soc_update_bits(codec, RT5663_RC_CLK, RT5663_DIG_25M_CLK_MASK,
+		RT5663_DIG_25M_CLK_EN);
+	snd_soc_update_bits(codec, RT5663_ADDA_CLK_1, RT5663_I2S_PD1_MASK, 0);
+	snd_soc_write(codec, RT5663_PRE_DIV_GATING_1, 0xff00);
+	snd_soc_write(codec, RT5663_PRE_DIV_GATING_2, 0xfffc);
+	snd_soc_write(codec, RT5663_HP_CHARGE_PUMP_1, 0x1232);
+	snd_soc_write(codec, RT5663_HP_LOGIC_2, 0x0005);
+	snd_soc_write(codec, RT5663_DEPOP_2, 0x3003);
+	snd_soc_update_bits(codec, RT5663_DEPOP_1, 0x0030, 0x0030);
+	snd_soc_update_bits(codec, RT5663_DEPOP_1, 0x0003, 0x0003);
+	snd_soc_update_bits(codec, RT5663_PWR_DIG_2,
+		RT5663_PWR_ADC_S1F | RT5663_PWR_DAC_S1F,
+		RT5663_PWR_ADC_S1F | RT5663_PWR_DAC_S1F);
+	snd_soc_update_bits(codec, RT5663_PWR_DIG_1,
+		RT5663_PWR_DAC_L1 | RT5663_PWR_DAC_R1 |
+		RT5663_PWR_LDO_DACREF_MASK | RT5663_PWR_ADC_L1 |
+		RT5663_PWR_ADC_R1,
+		RT5663_PWR_DAC_L1 | RT5663_PWR_DAC_R1 |
+		RT5663_PWR_LDO_DACREF_ON | RT5663_PWR_ADC_L1 |
+		RT5663_PWR_ADC_R1);
+	msleep(40);
+	snd_soc_update_bits(codec, RT5663_PWR_ANLG_2,
+		RT5663_PWR_RECMIX1 | RT5663_PWR_RECMIX2,
+		RT5663_PWR_RECMIX1 | RT5663_PWR_RECMIX2);
+	msleep(30);
+	snd_soc_write(codec, RT5663_HP_CHARGE_PUMP_2, 0x1371);
+	snd_soc_write(codec, RT5663_STO_DAC_MIXER, 0);
+	snd_soc_write(codec, RT5663_BYPASS_STO_DAC, 0x000c);
+	snd_soc_write(codec, RT5663_HP_BIAS, 0xafaa);
+	snd_soc_write(codec, RT5663_CHARGE_PUMP_1, 0x2224);
+	snd_soc_write(codec, RT5663_HP_OUT_EN, 0x8088);
+	snd_soc_write(codec, RT5663_CHOP_ADC, 0x3000);
+	snd_soc_write(codec, RT5663_ADDA_RST, 0xc000);
+	snd_soc_write(codec, RT5663_STO1_HPF_ADJ1, 0x3320);
+	snd_soc_write(codec, RT5663_HP_CALIB_2, 0x00c9);
+	snd_soc_write(codec, RT5663_DUMMY_1, 0x004c);
+	snd_soc_write(codec, RT5663_ANA_BIAS_CUR_1, 0x7733);
+	snd_soc_write(codec, RT5663_CHARGE_PUMP_2, 0x7777);
+	snd_soc_write(codec, RT5663_STO_DRE_9, 0x0007);
+	snd_soc_write(codec, RT5663_STO_DRE_10, 0x0007);
+	snd_soc_write(codec, RT5663_DUMMY_2, 0x02a4);
+	snd_soc_write(codec, RT5663_RECMIX, 0x0005);
+	snd_soc_write(codec, RT5663_HP_IMP_SEN_1, 0x4334);
+	snd_soc_update_bits(codec, RT5663_IRQ_3, 0x0004, 0x0004);
+	snd_soc_write(codec, RT5663_HP_LOGIC_1, 0x2200);
+	snd_soc_update_bits(codec, RT5663_DEPOP_1, 0x3000, 0x3000);
+	snd_soc_write(codec, RT5663_HP_LOGIC_1, 0x6200);
+
+	for (i = 0; i < 100; i++) {
+		msleep(20);
+		if (snd_soc_read(codec, RT5663_INT_ST_1) & 0x2)
+			break;
+	}
+
+	value = snd_soc_read(codec, RT5663_HP_IMP_SEN_4);
+
+	snd_soc_update_bits(codec, RT5663_DEPOP_1, 0x3000, 0);
+	snd_soc_write(codec, RT5663_INT_ST_1, 0);
+	snd_soc_write(codec, RT5663_HP_LOGIC_1, 0);
+	snd_soc_update_bits(codec, RT5663_RC_CLK, RT5663_DIG_25M_CLK_MASK,
+		RT5663_DIG_25M_CLK_DIS);
+	snd_soc_write(codec, RT5663_GLB_CLK, reg80);
+	snd_soc_write(codec, RT5663_RECMIX, reg10);
+	snd_soc_write(codec, RT5663_DUMMY_2, 0x00a4);
+	snd_soc_write(codec, RT5663_DUMMY_1, reg2fa);
+	snd_soc_write(codec, RT5663_HP_CALIB_2, 0x00c8);
+	snd_soc_write(codec, RT5663_STO1_HPF_ADJ1, 0xb320);
+	snd_soc_write(codec, RT5663_ADDA_RST, 0xe400);
+	snd_soc_write(codec, RT5663_CHOP_ADC, 0x2000);
+	snd_soc_write(codec, RT5663_HP_OUT_EN, 0x0008);
+	snd_soc_update_bits(codec, RT5663_PWR_ANLG_2,
+		RT5663_PWR_RECMIX1 | RT5663_PWR_RECMIX2, 0);
+	snd_soc_update_bits(codec, RT5663_PWR_DIG_1,
+		RT5663_PWR_DAC_L1 | RT5663_PWR_DAC_R1 |
+		RT5663_PWR_LDO_DACREF_MASK | RT5663_PWR_ADC_L1 |
+		RT5663_PWR_ADC_R1, 0);
+	snd_soc_update_bits(codec, RT5663_PWR_DIG_2,
+		RT5663_PWR_ADC_S1F | RT5663_PWR_DAC_S1F, 0);
+	snd_soc_update_bits(codec, RT5663_DEPOP_1, 0x0003, 0);
+	snd_soc_update_bits(codec, RT5663_DEPOP_1, 0x0030, 0);
+	snd_soc_write(codec, RT5663_HP_LOGIC_2, 0);
+	snd_soc_write(codec, RT5663_HP_CHARGE_PUMP_1, reg91);
+	snd_soc_update_bits(codec, RT5663_PWR_ANLG_1,
+		RT5663_PWR_VREF1_MASK | RT5663_PWR_VREF2_MASK, 0);
+	snd_soc_write(codec, RT5663_STO1_ADC_MIXER, reg26);
+	snd_soc_write(codec, RT5663_ASRC_2, reg84);
+
+	for (i = 0; i < rt5663->pdata.impedance_sensing_num; i++) {
+		if (value >= rt5663->imp_table[i].imp_min &&
+			value <= rt5663->imp_table[i].imp_max)
+			break;
+	}
+
+	snd_soc_update_bits(codec, RT5663_STO_DRE_9, RT5663_DRE_GAIN_HP_MASK,
+		rt5663->imp_table[i].vol);
+	snd_soc_update_bits(codec, RT5663_STO_DRE_10, RT5663_DRE_GAIN_HP_MASK,
+		rt5663->imp_table[i].vol);
+
+	if (rt5663->jack_type == SND_JACK_HEADSET) {
+		snd_soc_write(codec, RT5663_MIC_DECRO_2,
+			rt5663->imp_table[i].dc_offset_l_manual_mic >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_3,
+			rt5663->imp_table[i].dc_offset_l_manual_mic & 0xffff);
+		snd_soc_write(codec, RT5663_MIC_DECRO_5,
+			rt5663->imp_table[i].dc_offset_r_manual_mic >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_6,
+			rt5663->imp_table[i].dc_offset_r_manual_mic & 0xffff);
+	} else {
+		snd_soc_write(codec, RT5663_MIC_DECRO_2,
+			rt5663->imp_table[i].dc_offset_l_manual >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_3,
+			rt5663->imp_table[i].dc_offset_l_manual & 0xffff);
+		snd_soc_write(codec, RT5663_MIC_DECRO_5,
+			rt5663->imp_table[i].dc_offset_r_manual >> 16);
+		snd_soc_write(codec, RT5663_MIC_DECRO_6,
+			rt5663->imp_table[i].dc_offset_r_manual & 0xffff);
+	}
+
+	return 0;
+}
+
 static int rt5663_button_detect(struct snd_soc_codec *codec)
 {
 	int btn_type, val;
@@ -1701,6 +1889,8 @@ static void rt5663_jack_detect_work(struct work_struct *work)
 				break;
 			case CODEC_VER_0:
 				report = rt5663_jack_detect(rt5663->codec, 1);
+				if (rt5663->pdata.impedance_sensing_num)
+					rt5663_impedance_sensing(rt5663->codec);
 				break;
 			default:
 				dev_err(codec->dev, "Unknown CODEC Version\n");
@@ -1796,10 +1986,6 @@ static const struct snd_kcontrol_new rt5663_v2_specific_controls[] = {
 };
 
 static const struct snd_kcontrol_new rt5663_specific_controls[] = {
-	/* Headphone Output Volume */
-	SOC_DOUBLE_R_TLV("Headphone Playback Volume", RT5663_STO_DRE_9,
-		RT5663_STO_DRE_10, RT5663_DRE_GAIN_HP_SHIFT, 23, 1,
-		rt5663_hp_vol_tlv),
 	/* Mic Boost Volume*/
 	SOC_SINGLE_TLV("IN1 Capture Volume", RT5663_CBJ_2,
 		RT5663_GAIN_BST1_SHIFT, 8, 0, in_bst_tlv),
@@ -1807,6 +1993,13 @@ static const struct snd_kcontrol_new rt5663_specific_controls[] = {
 	SOC_ENUM("IF1 ADC Data Swap", rt5663_if1_adc_enum),
 };
 
+static const struct snd_kcontrol_new rt5663_hpvol_controls[] = {
+	/* Headphone Output Volume */
+	SOC_DOUBLE_R_TLV("Headphone Playback Volume", RT5663_STO_DRE_9,
+		RT5663_STO_DRE_10, RT5663_DRE_GAIN_HP_SHIFT, 23, 1,
+		rt5663_hp_vol_tlv),
+};
+
 static int rt5663_is_sys_clk_from_pll(struct snd_soc_dapm_widget *w,
 	struct snd_soc_dapm_widget *sink)
 {
@@ -2889,6 +3082,10 @@ static int rt5663_probe(struct snd_soc_codec *codec)
 			ARRAY_SIZE(rt5663_specific_dapm_routes));
 		snd_soc_add_codec_controls(codec, rt5663_specific_controls,
 			ARRAY_SIZE(rt5663_specific_controls));
+
+		if (!rt5663->imp_table)
+			snd_soc_add_codec_controls(codec, rt5663_hpvol_controls,
+				ARRAY_SIZE(rt5663_hpvol_controls));
 		break;
 	}
 
@@ -3177,6 +3374,8 @@ static void rt5663_calibrate(struct rt5663_priv *rt5663)
 
 static int rt5663_parse_dp(struct rt5663_priv *rt5663, struct device *dev)
 {
+	int table_size;
+
 	device_property_read_u32(dev, "realtek,dc_offset_l_manual",
 		&rt5663->pdata.dc_offset_l_manual);
 	device_property_read_u32(dev, "realtek,dc_offset_r_manual",
@@ -3185,6 +3384,17 @@ static int rt5663_parse_dp(struct rt5663_priv *rt5663, struct device *dev)
 		&rt5663->pdata.dc_offset_l_manual_mic);
 	device_property_read_u32(dev, "realtek,dc_offset_r_manual_mic",
 		&rt5663->pdata.dc_offset_r_manual_mic);
+	device_property_read_u32(dev, "realtek,impedance_sensing_num",
+		&rt5663->pdata.impedance_sensing_num);
+
+	if (rt5663->pdata.impedance_sensing_num) {
+		table_size = sizeof(struct impedance_mapping_table) *
+			rt5663->pdata.impedance_sensing_num;
+		rt5663->imp_table = devm_kzalloc(dev, table_size, GFP_KERNEL);
+		device_property_read_u32_array(dev,
+			"realtek,impedance_sensing_table",
+			(u32 *)rt5663->imp_table, table_size);
+	}
 
 	return 0;
 }