ASoC: rt1308-sdw: add rt1308 SdW amplifier driver

This is the initial amplifier driver for rt1308-sdw.
Signed-off-by: Shuming Fan <shumingf@realtek.com>
Link: https://lore.kernel.org/r/20200110014606.17333-1-shumingf@realtek.comTested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/Kconfig

@@ -168,6 +168,7 @@ config SND_SOC_ALL_CODECS
 	select SND_SOC_RT700_SDW if SOUNDWIRE
 	select SND_SOC_RT711_SDW if SOUNDWIRE
 	select SND_SOC_RT715_SDW if SOUNDWIRE
+	select SND_SOC_RT1308_SDW if SOUNDWIRE
 	select SND_SOC_SGTL5000 if I2C
 	select SND_SOC_SI476X if MFD_SI476X_CORE
 	select SND_SOC_SIMPLE_AMPLIFIER
@@ -1005,6 +1006,11 @@ config SND_SOC_RT1305
 config SND_SOC_RT1308
 	tristate
 
+config SND_SOC_RT1308_SDW
+	tristate "Realtek RT1308 Codec - SDW"
+	depends on SOUNDWIRE
+	select REGMAP_SOUNDWIRE
+
 config SND_SOC_RT5514
 	tristate
 

sound/soc/codecs/Makefile

@@ -154,6 +154,7 @@ snd-soc-rl6347a-objs := rl6347a.o
 snd-soc-rt1011-objs := rt1011.o
 snd-soc-rt1305-objs := rt1305.o
 snd-soc-rt1308-objs := rt1308.o
+snd-soc-rt1308-sdw-objs := rt1308-sdw.o
 snd-soc-rt274-objs := rt274.o
 snd-soc-rt286-objs := rt286.o
 snd-soc-rt298-objs := rt298.o
@@ -448,6 +449,7 @@ obj-$(CONFIG_SND_SOC_RL6347A)	+= snd-soc-rl6347a.o
 obj-$(CONFIG_SND_SOC_RT1011)	+= snd-soc-rt1011.o
 obj-$(CONFIG_SND_SOC_RT1305)	+= snd-soc-rt1305.o
 obj-$(CONFIG_SND_SOC_RT1308)	+= snd-soc-rt1308.o
+obj-$(CONFIG_SND_SOC_RT1308_SDW)	+= snd-soc-rt1308-sdw.o
 obj-$(CONFIG_SND_SOC_RT274)	+= snd-soc-rt274.o
 obj-$(CONFIG_SND_SOC_RT286)	+= snd-soc-rt286.o
 obj-$(CONFIG_SND_SOC_RT298)	+= snd-soc-rt298.o

sound/soc/codecs/rt1308-sdw.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// rt1308-sdw.c -- rt1308 ALSA SoC audio driver
+//
+// Copyright(c) 2019 Realtek Semiconductor Corp.
+//
+//
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/pm_runtime.h>
+#include <linux/mod_devicetable.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_type.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/initval.h>
+
+#include "rt1308.h"
+#include "rt1308-sdw.h"
+
+static bool rt1308_readable_register(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case 0x00e0:
+	case 0x00f0:
+	case 0x2f01 ... 0x2f07:
+	case 0x3000 ... 0x3001:
+	case 0x3004 ... 0x3005:
+	case 0x3008:
+	case 0x300a:
+	case 0xc000 ... 0xcff3:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool rt1308_volatile_register(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case 0x2f01 ... 0x2f07:
+	case 0x3000 ... 0x3001:
+	case 0x3004 ... 0x3005:
+	case 0x3008:
+	case 0x300a:
+	case 0xc000:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config rt1308_sdw_regmap = {
+	.reg_bits = 32,
+	.val_bits = 8,
+	.readable_reg = rt1308_readable_register,
+	.volatile_reg = rt1308_volatile_register,
+	.max_register = 0xcfff,
+	.reg_defaults = rt1308_reg_defaults,
+	.num_reg_defaults = ARRAY_SIZE(rt1308_reg_defaults),
+	.cache_type = REGCACHE_RBTREE,
+	.use_single_read = true,
+	.use_single_write = true,
+};
+
+/* Bus clock frequency */
+#define RT1308_CLK_FREQ_9600000HZ 9600000
+#define RT1308_CLK_FREQ_12000000HZ 12000000
+#define RT1308_CLK_FREQ_6000000HZ 6000000
+#define RT1308_CLK_FREQ_4800000HZ 4800000
+#define RT1308_CLK_FREQ_2400000HZ 2400000
+#define RT1308_CLK_FREQ_12288000HZ 12288000
+
+static int rt1308_clock_config(struct device *dev)
+{
+	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(dev);
+	unsigned int clk_freq, value;
+
+	clk_freq = (rt1308->params.curr_dr_freq >> 1);
+
+	switch (clk_freq) {
+	case RT1308_CLK_FREQ_12000000HZ:
+		value = 0x0;
+		break;
+	case RT1308_CLK_FREQ_6000000HZ:
+		value = 0x1;
+		break;
+	case RT1308_CLK_FREQ_9600000HZ:
+		value = 0x2;
+		break;
+	case RT1308_CLK_FREQ_4800000HZ:
+		value = 0x3;
+		break;
+	case RT1308_CLK_FREQ_2400000HZ:
+		value = 0x4;
+		break;
+	case RT1308_CLK_FREQ_12288000HZ:
+		value = 0x5;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	regmap_write(rt1308->regmap, 0xe0, value);
+	regmap_write(rt1308->regmap, 0xf0, value);
+
+	dev_dbg(dev, "%s complete, clk_freq=%d\n", __func__, clk_freq);
+
+	return 0;
+}
+
+static int rt1308_read_prop(struct sdw_slave *slave)
+{
+	struct sdw_slave_prop *prop = &slave->prop;
+	int nval, i, num_of_ports = 1;
+	u32 bit;
+	unsigned long addr;
+	struct sdw_dpn_prop *dpn;
+
+	prop->paging_support = true;
+
+	/* first we need to allocate memory for set bits in port lists */
+	prop->source_ports = 0x00; /* BITMAP: 00010100 (not enable yet) */
+	prop->sink_ports = 0x2; /* BITMAP:  00000010 */
+
+	/* for sink */
+	nval = hweight32(prop->sink_ports);
+	num_of_ports += nval;
+	prop->sink_dpn_prop = devm_kcalloc(&slave->dev, nval,
+						sizeof(*prop->sink_dpn_prop),
+						GFP_KERNEL);
+	if (!prop->sink_dpn_prop)
+		return -ENOMEM;
+
+	i = 0;
+	dpn = prop->sink_dpn_prop;
+	addr = prop->sink_ports;
+	for_each_set_bit(bit, &addr, 32) {
+		dpn[i].num = bit;
+		dpn[i].type = SDW_DPN_FULL;
+		dpn[i].simple_ch_prep_sm = true;
+		dpn[i].ch_prep_timeout = 10;
+		i++;
+	}
+
+	/* Allocate port_ready based on num_of_ports */
+	slave->port_ready = devm_kcalloc(&slave->dev, num_of_ports,
+					sizeof(*slave->port_ready),
+					GFP_KERNEL);
+	if (!slave->port_ready)
+		return -ENOMEM;
+
+	/* Initialize completion */
+	for (i = 0; i < num_of_ports; i++)
+		init_completion(&slave->port_ready[i]);
+
+	/* set the timeout values */
+	prop->clk_stop_timeout = 20;
+
+	dev_dbg(&slave->dev, "%s\n", __func__);
+
+	return 0;
+}
+
+static int rt1308_io_init(struct device *dev, struct sdw_slave *slave)
+{
+	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(dev);
+	int ret = 0;
+	unsigned int efuse_m_btl_l, efuse_m_btl_r, tmp;
+	unsigned int efuse_c_btl_l, efuse_c_btl_r;
+
+	if (rt1308->hw_init)
+		return 0;
+
+	ret = rt1308_read_prop(slave);
+	if (ret < 0)
+		goto _io_init_err_;
+
+	if (rt1308->first_hw_init) {
+		regcache_cache_only(rt1308->regmap, false);
+		regcache_cache_bypass(rt1308->regmap, true);
+	}
+
+	/*
+	 * PM runtime is only enabled when a Slave reports as Attached
+	 */
+	if (!rt1308->first_hw_init) {
+		/* set autosuspend parameters */
+		pm_runtime_set_autosuspend_delay(&slave->dev, 3000);
+		pm_runtime_use_autosuspend(&slave->dev);
+
+		/* update count of parent 'active' children */
+		pm_runtime_set_active(&slave->dev);
+
+		/* make sure the device does not suspend immediately */
+		pm_runtime_mark_last_busy(&slave->dev);
+
+		pm_runtime_enable(&slave->dev);
+	}
+
+	pm_runtime_get_noresume(&slave->dev);
+
+	/* sw reset */
+	regmap_write(rt1308->regmap, RT1308_SDW_RESET, 0);
+
+	/* read efuse */
+	regmap_write(rt1308->regmap, 0xc360, 0x01);
+	regmap_write(rt1308->regmap, 0xc361, 0x80);
+	regmap_write(rt1308->regmap, 0xc7f0, 0x04);
+	regmap_write(rt1308->regmap, 0xc7f1, 0xfe);
+	msleep(100);
+	regmap_write(rt1308->regmap, 0xc7f0, 0x44);
+	msleep(20);
+	regmap_write(rt1308->regmap, 0xc240, 0x10);
+
+	regmap_read(rt1308->regmap, 0xc861, &tmp);
+	efuse_m_btl_l = tmp;
+	regmap_read(rt1308->regmap, 0xc860, &tmp);
+	efuse_m_btl_l = efuse_m_btl_l | (tmp << 8);
+	regmap_read(rt1308->regmap, 0xc863, &tmp);
+	efuse_c_btl_l = tmp;
+	regmap_read(rt1308->regmap, 0xc862, &tmp);
+	efuse_c_btl_l = efuse_c_btl_l | (tmp << 8);
+	regmap_read(rt1308->regmap, 0xc871, &tmp);
+	efuse_m_btl_r = tmp;
+	regmap_read(rt1308->regmap, 0xc870, &tmp);
+	efuse_m_btl_r = efuse_m_btl_r | (tmp << 8);
+	regmap_read(rt1308->regmap, 0xc873, &tmp);
+	efuse_c_btl_r = tmp;
+	regmap_read(rt1308->regmap, 0xc872, &tmp);
+	efuse_c_btl_r = efuse_c_btl_r | (tmp << 8);
+	dev_info(&slave->dev, "%s m_btl_l=0x%x, m_btl_r=0x%x\n", __func__,
+		efuse_m_btl_l, efuse_m_btl_r);
+	dev_info(&slave->dev, "%s c_btl_l=0x%x, c_btl_r=0x%x\n", __func__,
+		efuse_c_btl_l, efuse_c_btl_r);
+
+	/* initial settings */
+	regmap_write(rt1308->regmap, 0xc103, 0xc0);
+	regmap_write(rt1308->regmap, 0xc030, 0x17);
+	regmap_write(rt1308->regmap, 0xc031, 0x81);
+	regmap_write(rt1308->regmap, 0xc032, 0x26);
+	regmap_write(rt1308->regmap, 0xc040, 0x80);
+	regmap_write(rt1308->regmap, 0xc041, 0x80);
+	regmap_write(rt1308->regmap, 0xc042, 0x06);
+	regmap_write(rt1308->regmap, 0xc052, 0x0a);
+	regmap_write(rt1308->regmap, 0xc080, 0x0a);
+	regmap_write(rt1308->regmap, 0xc060, 0x02);
+	regmap_write(rt1308->regmap, 0xc061, 0x75);
+	regmap_write(rt1308->regmap, 0xc062, 0x05);
+	regmap_write(rt1308->regmap, 0xc171, 0x07);
+	regmap_write(rt1308->regmap, 0xc173, 0x0d);
+	regmap_write(rt1308->regmap, 0xc311, 0x7f);
+	regmap_write(rt1308->regmap, 0xc900, 0x90);
+	regmap_write(rt1308->regmap, 0xc1a0, 0x84);
+	regmap_write(rt1308->regmap, 0xc1a1, 0x01);
+	regmap_write(rt1308->regmap, 0xc360, 0x78);
+	regmap_write(rt1308->regmap, 0xc361, 0x87);
+	regmap_write(rt1308->regmap, 0xc0a1, 0x71);
+	regmap_write(rt1308->regmap, 0xc210, 0x00);
+	regmap_write(rt1308->regmap, 0xc070, 0x00);
+	regmap_write(rt1308->regmap, 0xc100, 0xd7);
+	regmap_write(rt1308->regmap, 0xc101, 0xd7);
+	regmap_write(rt1308->regmap, 0xc300, 0x09);
+
+	if (rt1308->first_hw_init) {
+		regcache_cache_bypass(rt1308->regmap, false);
+		regcache_mark_dirty(rt1308->regmap);
+	} else
+		rt1308->first_hw_init = true;
+
+	/* Mark Slave initialization complete */
+	rt1308->hw_init = true;
+
+	pm_runtime_mark_last_busy(&slave->dev);
+	pm_runtime_put_autosuspend(&slave->dev);
+
+	dev_dbg(&slave->dev, "%s hw_init complete\n", __func__);
+
+_io_init_err_:
+	return ret;
+}
+
+static int rt1308_update_status(struct sdw_slave *slave,
+					enum sdw_slave_status status)
+{
+	struct  rt1308_sdw_priv *rt1308 = dev_get_drvdata(&slave->dev);
+
+	/* Update the status */
+	rt1308->status = status;
+
+	if (status == SDW_SLAVE_UNATTACHED)
+		rt1308->hw_init = false;
+
+	/*
+	 * Perform initialization only if slave status is present and
+	 * hw_init flag is false
+	 */
+	if (rt1308->hw_init || rt1308->status != SDW_SLAVE_ATTACHED)
+		return 0;
+
+	/* perform I/O transfers required for Slave initialization */
+	return rt1308_io_init(&slave->dev, slave);
+}
+
+static int rt1308_bus_config(struct sdw_slave *slave,
+				struct sdw_bus_params *params)
+{
+	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(&slave->dev);
+	int ret;
+
+	memcpy(&rt1308->params, params, sizeof(*params));
+
+	ret = rt1308_clock_config(&slave->dev);
+	if (ret < 0)
+		dev_err(&slave->dev, "Invalid clk config");
+
+	return ret;
+}
+
+static int rt1308_interrupt_callback(struct sdw_slave *slave,
+					struct sdw_slave_intr_status *status)
+{
+	dev_dbg(&slave->dev,
+		"%s control_port_stat=%x", __func__, status->control_port);
+
+	return 0;
+}
+
+static int rt1308_classd_event(struct snd_soc_dapm_widget *w,
+	struct snd_kcontrol *kcontrol, int event)
+{
+	struct snd_soc_component *component =
+		snd_soc_dapm_to_component(w->dapm);
+
+	switch (event) {
+	case SND_SOC_DAPM_POST_PMU:
+		msleep(30);
+		snd_soc_component_update_bits(component,
+			RT1308_SDW_OFFSET | (RT1308_POWER_STATUS << 4),
+			0x3,	0x3);
+		msleep(40);
+		break;
+	case SND_SOC_DAPM_PRE_PMD:
+		snd_soc_component_update_bits(component,
+			RT1308_SDW_OFFSET | (RT1308_POWER_STATUS << 4),
+			0x3, 0);
+		usleep_range(150000, 200000);
+		break;
+
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+static const char * const rt1308_rx_data_ch_select[] = {
+	"LR",
+	"LL",
+	"RL",
+	"RR",
+};
+
+static SOC_ENUM_SINGLE_DECL(rt1308_rx_data_ch_enum,
+	RT1308_SDW_OFFSET | (RT1308_DATA_PATH << 4), 0,
+	rt1308_rx_data_ch_select);
+
+static const struct snd_kcontrol_new rt1308_snd_controls[] = {
+
+	/* I2S Data Channel Selection */
+	SOC_ENUM("RX Channel Select", rt1308_rx_data_ch_enum),
+};
+
+static const struct snd_kcontrol_new rt1308_sto_dac_l =
+	SOC_DAPM_SINGLE_AUTODISABLE("Switch",
+		RT1308_SDW_OFFSET_BYTE3 | (RT1308_DAC_SET << 4),
+		RT1308_DVOL_MUTE_L_EN_SFT, 1, 1);
+
+static const struct snd_kcontrol_new rt1308_sto_dac_r =
+	SOC_DAPM_SINGLE_AUTODISABLE("Switch",
+		RT1308_SDW_OFFSET_BYTE3 | (RT1308_DAC_SET << 4),
+		RT1308_DVOL_MUTE_R_EN_SFT, 1, 1);
+
+static const struct snd_soc_dapm_widget rt1308_dapm_widgets[] = {
+	/* Audio Interface */
+	SND_SOC_DAPM_AIF_IN("AIF1RX", "DP1 Playback", 0, SND_SOC_NOPM, 0, 0),
+
+	/* Supply Widgets */
+	SND_SOC_DAPM_SUPPLY("MBIAS20U",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	7, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("ALDO",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	6, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("DBG",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	5, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("DACL",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	4, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("CLK25M",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	2, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("ADC_R",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	1, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("ADC_L",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	0, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("DAC Power",
+		RT1308_SDW_OFFSET | (RT1308_POWER << 4),	3, 0, NULL, 0),
+
+	SND_SOC_DAPM_SUPPLY("DLDO",
+		RT1308_SDW_OFFSET_BYTE1 | (RT1308_POWER << 4),	5, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("VREF",
+		RT1308_SDW_OFFSET_BYTE1 | (RT1308_POWER << 4),	4, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("MIXER_R",
+		RT1308_SDW_OFFSET_BYTE1 | (RT1308_POWER << 4),	2, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("MIXER_L",
+		RT1308_SDW_OFFSET_BYTE1 | (RT1308_POWER << 4),	1, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("MBIAS4U",
+		RT1308_SDW_OFFSET_BYTE1 | (RT1308_POWER << 4),	0, 0, NULL, 0),
+
+	SND_SOC_DAPM_SUPPLY("PLL2_LDO",
+		RT1308_SDW_OFFSET_BYTE2 | (RT1308_POWER << 4), 4, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("PLL2B",
+		RT1308_SDW_OFFSET_BYTE2 | (RT1308_POWER << 4), 3, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("PLL2F",
+		RT1308_SDW_OFFSET_BYTE2 | (RT1308_POWER << 4), 2, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("PLL2F2",
+		RT1308_SDW_OFFSET_BYTE2 | (RT1308_POWER << 4), 1, 0, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("PLL2B2",
+		RT1308_SDW_OFFSET_BYTE2 | (RT1308_POWER << 4), 0, 0, NULL, 0),
+
+	/* Digital Interface */
+	SND_SOC_DAPM_DAC("DAC", NULL, SND_SOC_NOPM, 0, 0),
+	SND_SOC_DAPM_SWITCH("DAC L", SND_SOC_NOPM, 0, 0, &rt1308_sto_dac_l),
+	SND_SOC_DAPM_SWITCH("DAC R", SND_SOC_NOPM, 0, 0, &rt1308_sto_dac_r),
+
+	/* Output Lines */
+	SND_SOC_DAPM_PGA_E("CLASS D", SND_SOC_NOPM, 0, 0, NULL, 0,
+		rt1308_classd_event,
+		SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMU),
+	SND_SOC_DAPM_OUTPUT("SPOL"),
+	SND_SOC_DAPM_OUTPUT("SPOR"),
+};
+
+static const struct snd_soc_dapm_route rt1308_dapm_routes[] = {
+
+	{ "DAC", NULL, "AIF1RX" },
+
+	{ "DAC", NULL, "MBIAS20U" },
+	{ "DAC", NULL, "ALDO" },
+	{ "DAC", NULL, "DBG" },
+	{ "DAC", NULL, "DACL" },
+	{ "DAC", NULL, "CLK25M" },
+	{ "DAC", NULL, "ADC_R" },
+	{ "DAC", NULL, "ADC_L" },
+	{ "DAC", NULL, "DLDO" },
+	{ "DAC", NULL, "VREF" },
+	{ "DAC", NULL, "MIXER_R" },
+	{ "DAC", NULL, "MIXER_L" },
+	{ "DAC", NULL, "MBIAS4U" },
+	{ "DAC", NULL, "PLL2_LDO" },
+	{ "DAC", NULL, "PLL2B" },
+	{ "DAC", NULL, "PLL2F" },
+	{ "DAC", NULL, "PLL2F2" },
+	{ "DAC", NULL, "PLL2B2" },
+
+	{ "DAC L", "Switch", "DAC" },
+	{ "DAC R", "Switch", "DAC" },
+	{ "DAC L", NULL, "DAC Power" },
+	{ "DAC R", NULL, "DAC Power" },
+
+	{ "CLASS D", NULL, "DAC L" },
+	{ "CLASS D", NULL, "DAC R" },
+	{ "SPOL", NULL, "CLASS D" },
+	{ "SPOR", NULL, "CLASS D" },
+};
+
+static int rt1308_set_sdw_stream(struct snd_soc_dai *dai, void *sdw_stream,
+				int direction)
+{
+	struct sdw_stream_data *stream;
+
+	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+	if (!stream)
+		return -ENOMEM;
+
+	stream->sdw_stream = (struct sdw_stream_runtime *)sdw_stream;
+
+	/* Use tx_mask or rx_mask to configure stream tag and set dma_data */
+	if (direction == SNDRV_PCM_STREAM_PLAYBACK)
+		dai->playback_dma_data = stream;
+	else
+		dai->capture_dma_data = stream;
+
+	return 0;
+}
+
+static void rt1308_sdw_shutdown(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct sdw_stream_data *stream;
+
+	stream = snd_soc_dai_get_dma_data(dai, substream);
+	snd_soc_dai_set_dma_data(dai, substream, NULL);
+	kfree(stream);
+}
+
+static int rt1308_sdw_hw_params(struct snd_pcm_substream *substream,
+	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct rt1308_sdw_priv *rt1308 =
+		snd_soc_component_get_drvdata(component);
+	struct sdw_stream_config stream_config;
+	struct sdw_port_config port_config;
+	enum sdw_data_direction direction;
+	struct sdw_stream_data *stream;
+	int retval, port, num_channels;
+
+	dev_dbg(dai->dev, "%s %s", __func__, dai->name);
+	stream = snd_soc_dai_get_dma_data(dai, substream);
+
+	if (!stream)
+		return -EINVAL;
+
+	if (!rt1308->sdw_slave)
+		return -EINVAL;
+
+	/* SoundWire specific configuration */
+	/* port 1 for playback */
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		direction = SDW_DATA_DIR_RX;
+		port = 1;
+	} else {
+		return -EINVAL;
+	}
+
+	stream_config.frame_rate = params_rate(params);
+	stream_config.ch_count = params_channels(params);
+	stream_config.bps = snd_pcm_format_width(params_format(params));
+	stream_config.direction = direction;
+
+	num_channels = params_channels(params);
+	port_config.ch_mask = (1 << (num_channels)) - 1;
+	port_config.num = port;
+
+	retval = sdw_stream_add_slave(rt1308->sdw_slave, &stream_config,
+				&port_config, 1, stream->sdw_stream);
+	if (retval) {
+		dev_err(dai->dev, "Unable to configure port\n");
+		return retval;
+	}
+
+	return retval;
+}
+
+static int rt1308_sdw_pcm_hw_free(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct rt1308_sdw_priv *rt1308 =
+		snd_soc_component_get_drvdata(component);
+	struct sdw_stream_data *stream =
+		snd_soc_dai_get_dma_data(dai, substream);
+
+	if (!rt1308->sdw_slave)
+		return -EINVAL;
+
+	sdw_stream_remove_slave(rt1308->sdw_slave, stream->sdw_stream);
+	return 0;
+}
+
+/*
+ * slave_ops: callbacks for get_clock_stop_mode, clock_stop and
+ * port_prep are not defined for now
+ */
+static struct sdw_slave_ops rt1308_slave_ops = {
+	.read_prop = rt1308_read_prop,
+	.interrupt_callback = rt1308_interrupt_callback,
+	.update_status = rt1308_update_status,
+	.bus_config = rt1308_bus_config,
+};
+
+static const struct snd_soc_component_driver soc_component_sdw_rt1308 = {
+	.controls = rt1308_snd_controls,
+	.num_controls = ARRAY_SIZE(rt1308_snd_controls),
+	.dapm_widgets = rt1308_dapm_widgets,
+	.num_dapm_widgets = ARRAY_SIZE(rt1308_dapm_widgets),
+	.dapm_routes = rt1308_dapm_routes,
+	.num_dapm_routes = ARRAY_SIZE(rt1308_dapm_routes),
+};
+
+static const struct snd_soc_dai_ops rt1308_aif_dai_ops = {
+	.hw_params = rt1308_sdw_hw_params,
+	.hw_free	= rt1308_sdw_pcm_hw_free,
+	.set_sdw_stream	= rt1308_set_sdw_stream,
+	.shutdown	= rt1308_sdw_shutdown,
+};
+
+#define RT1308_STEREO_RATES SNDRV_PCM_RATE_48000
+#define RT1308_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
+			SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S16_LE | \
+			SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_driver rt1308_sdw_dai[] = {
+	{
+		.name = "rt1308-aif",
+		.playback = {
+			.stream_name = "DP1 Playback",
+			.channels_min = 1,
+			.channels_max = 2,
+			.rates = RT1308_STEREO_RATES,
+			.formats = RT1308_FORMATS,
+		},
+		.ops = &rt1308_aif_dai_ops,
+	},
+};
+
+static int rt1308_sdw_init(struct device *dev, struct regmap *regmap,
+				struct sdw_slave *slave)
+{
+	struct rt1308_sdw_priv *rt1308;
+	int ret;
+
+	rt1308 = devm_kzalloc(dev, sizeof(*rt1308), GFP_KERNEL);
+	if (!rt1308)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, rt1308);
+	rt1308->sdw_slave = slave;
+	rt1308->regmap = regmap;
+
+	/*
+	 * Mark hw_init to false
+	 * HW init will be performed when device reports present
+	 */
+	rt1308->hw_init = false;
+	rt1308->first_hw_init = false;
+
+	ret =  devm_snd_soc_register_component(dev,
+				&soc_component_sdw_rt1308,
+				rt1308_sdw_dai,
+				ARRAY_SIZE(rt1308_sdw_dai));
+
+	dev_dbg(&slave->dev, "%s\n", __func__);
+
+	return ret;
+}
+
+static int rt1308_sdw_probe(struct sdw_slave *slave,
+				const struct sdw_device_id *id)
+{
+	struct regmap *regmap;
+
+	/* Assign ops */
+	slave->ops = &rt1308_slave_ops;
+
+	/* Regmap Initialization */
+	regmap = devm_regmap_init_sdw(slave, &rt1308_sdw_regmap);
+	if (!regmap)
+		return -EINVAL;
+
+	rt1308_sdw_init(&slave->dev, regmap, slave);
+
+	return 0;
+}
+
+static const struct sdw_device_id rt1308_id[] = {
+	SDW_SLAVE_ENTRY(0x025d, 0x1308, 0),
+	{},
+};
+MODULE_DEVICE_TABLE(sdw, rt1308_id);
+
+static int rt1308_dev_suspend(struct device *dev)
+{
+	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(dev);
+
+	if (!rt1308->hw_init)
+		return 0;
+
+	regcache_cache_only(rt1308->regmap, true);
+
+	return 0;
+}
+
+#define RT1308_PROBE_TIMEOUT 2000
+
+static int rt1308_dev_resume(struct device *dev)
+{
+	struct sdw_slave *slave = dev_to_sdw_dev(dev);
+	struct rt1308_sdw_priv *rt1308 = dev_get_drvdata(dev);
+	unsigned long time;
+
+	if (!rt1308->hw_init)
+		return 0;
+
+	if (!slave->unattach_request)
+		goto regmap_sync;
+
+	time = wait_for_completion_timeout(&slave->initialization_complete,
+				msecs_to_jiffies(RT1308_PROBE_TIMEOUT));
+	if (!time) {
+		dev_err(&slave->dev, "Initialization not complete, timed out\n");
+		return -ETIMEDOUT;
+	}
+
+regmap_sync:
+	slave->unattach_request = 0;
+	regcache_cache_only(rt1308->regmap, false);
+	regcache_sync_region(rt1308->regmap, 0xc000, 0xcfff);
+
+	return 0;
+}
+
+static const struct dev_pm_ops rt1308_pm = {
+	SET_SYSTEM_SLEEP_PM_OPS(rt1308_dev_suspend, rt1308_dev_resume)
+	SET_RUNTIME_PM_OPS(rt1308_dev_suspend, rt1308_dev_resume, NULL)
+};
+
+static struct sdw_driver rt1308_sdw_driver = {
+	.driver = {
+		.name = "rt1308",
+		.owner = THIS_MODULE,
+		.pm = &rt1308_pm,
+	},
+	.probe = rt1308_sdw_probe,
+	.ops = &rt1308_slave_ops,
+	.id_table = rt1308_id,
+};
+module_sdw_driver(rt1308_sdw_driver);
+
+MODULE_DESCRIPTION("ASoC RT1308 driver SDW");
+MODULE_AUTHOR("Shuming Fan <shumingf@realtek.com>");
+MODULE_LICENSE("GPL v2");

sound/soc/codecs/rt1308-sdw.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * rt1308-sdw.h -- RT1308 ALSA SoC audio driver header
+ *
+ * Copyright(c) 2019 Realtek Semiconductor Corp.
+ */
+
+#ifndef __RT1308_SDW_H__
+#define __RT1308_SDW_H__
+
+static const struct reg_default rt1308_reg_defaults[] = {
+	{ 0x0000, 0x00 },
+	{ 0x0001, 0x00 },
+	{ 0x0002, 0x00 },
+	{ 0x0003, 0x00 },
+	{ 0x0004, 0x00 },
+	{ 0x0005, 0x01 },
+	{ 0x0020, 0x00 },
+	{ 0x0022, 0x00 },
+	{ 0x0023, 0x00 },
+	{ 0x0024, 0x00 },
+	{ 0x0025, 0x00 },
+	{ 0x0026, 0x00 },
+	{ 0x0030, 0x00 },
+	{ 0x0032, 0x00 },
+	{ 0x0033, 0x00 },
+	{ 0x0034, 0x00 },
+	{ 0x0035, 0x00 },
+	{ 0x0036, 0x00 },
+	{ 0x0040, 0x00 },
+	{ 0x0041, 0x00 },
+	{ 0x0042, 0x00 },
+	{ 0x0043, 0x00 },
+	{ 0x0044, 0x20 },
+	{ 0x0045, 0x01 },
+	{ 0x0046, 0x01 },
+	{ 0x0048, 0x00 },
+	{ 0x0049, 0x00 },
+	{ 0x0050, 0x20 },
+	{ 0x0051, 0x02 },
+	{ 0x0052, 0x5D },
+	{ 0x0053, 0x13 },
+	{ 0x0054, 0x08 },
+	{ 0x0055, 0x00 },
+	{ 0x0060, 0x00 },
+	{ 0x0070, 0x00 },
+	{ 0x00E0, 0x00 },
+	{ 0x00F0, 0x00 },
+	{ 0x0100, 0x00 },
+	{ 0x0101, 0x00 },
+	{ 0x0102, 0x20 },
+	{ 0x0103, 0x00 },
+	{ 0x0104, 0x00 },
+	{ 0x0105, 0x03 },
+	{ 0x0120, 0x00 },
+	{ 0x0122, 0x00 },
+	{ 0x0123, 0x00 },
+	{ 0x0124, 0x00 },
+	{ 0x0125, 0x00 },
+	{ 0x0126, 0x00 },
+	{ 0x0127, 0x00 },
+	{ 0x0130, 0x00 },
+	{ 0x0132, 0x00 },
+	{ 0x0133, 0x00 },
+	{ 0x0134, 0x00 },
+	{ 0x0135, 0x00 },
+	{ 0x0136, 0x00 },
+	{ 0x0137, 0x00 },
+	{ 0x0200, 0x00 },
+	{ 0x0201, 0x00 },
+	{ 0x0202, 0x00 },
+	{ 0x0203, 0x00 },
+	{ 0x0204, 0x00 },
+	{ 0x0205, 0x03 },
+	{ 0x0220, 0x00 },
+	{ 0x0222, 0x00 },
+	{ 0x0223, 0x00 },
+	{ 0x0224, 0x00 },
+	{ 0x0225, 0x00 },
+	{ 0x0226, 0x00 },
+	{ 0x0227, 0x00 },
+	{ 0x0230, 0x00 },
+	{ 0x0232, 0x00 },
+	{ 0x0233, 0x00 },
+	{ 0x0234, 0x00 },
+	{ 0x0235, 0x00 },
+	{ 0x0236, 0x00 },
+	{ 0x0237, 0x00 },
+	{ 0x0400, 0x00 },
+	{ 0x0401, 0x00 },
+	{ 0x0402, 0x00 },
+	{ 0x0403, 0x00 },
+	{ 0x0404, 0x00 },
+	{ 0x0405, 0x03 },
+	{ 0x0420, 0x00 },
+	{ 0x0422, 0x00 },
+	{ 0x0423, 0x00 },
+	{ 0x0424, 0x00 },
+	{ 0x0425, 0x00 },
+	{ 0x0426, 0x00 },
+	{ 0x0427, 0x00 },
+	{ 0x0430, 0x00 },
+	{ 0x0432, 0x00 },
+	{ 0x0433, 0x00 },
+	{ 0x0434, 0x00 },
+	{ 0x0435, 0x00 },
+	{ 0x0436, 0x00 },
+	{ 0x0437, 0x00 },
+	{ 0x0f00, 0x00 },
+	{ 0x0f01, 0x00 },
+	{ 0x0f02, 0x00 },
+	{ 0x0f03, 0x00 },
+	{ 0x0f04, 0x00 },
+	{ 0x0f05, 0x00 },
+	{ 0x0f20, 0x00 },
+	{ 0x0f22, 0x00 },
+	{ 0x0f23, 0x00 },
+	{ 0x0f24, 0x00 },
+	{ 0x0f25, 0x00 },
+	{ 0x0f26, 0x00 },
+	{ 0x0f27, 0x00 },
+	{ 0x0f30, 0x00 },
+	{ 0x0f32, 0x00 },
+	{ 0x0f33, 0x00 },
+	{ 0x0f34, 0x00 },
+	{ 0x0f35, 0x00 },
+	{ 0x0f36, 0x00 },
+	{ 0x0f37, 0x00 },
+	{ 0x2f01, 0x01 },
+	{ 0x2f02, 0x09 },
+	{ 0x2f03, 0x00 },
+	{ 0x2f04, 0x0f },
+	{ 0x2f05, 0x0b },
+	{ 0x2f06, 0x01 },
+	{ 0x2f07, 0x8e },
+	{ 0x3000, 0x00 },
+	{ 0x3001, 0x00 },
+	{ 0x3004, 0x01 },
+	{ 0x3005, 0x23 },
+	{ 0x3008, 0x02 },
+	{ 0x300a, 0x00 },
+	{ 0xc003 | (RT1308_DAC_SET << 4), 0x00 },
+	{ 0xc001 | (RT1308_POWER << 4), 0x00 },
+	{ 0xc002 | (RT1308_POWER << 4), 0x00 },
+};
+
+#define RT1308_SDW_OFFSET 0xc000
+#define RT1308_SDW_OFFSET_BYTE0 0xc000
+#define RT1308_SDW_OFFSET_BYTE1 0xc001
+#define RT1308_SDW_OFFSET_BYTE2 0xc002
+#define RT1308_SDW_OFFSET_BYTE3 0xc003
+
+#define RT1308_SDW_RESET (RT1308_SDW_OFFSET | (RT1308_RESET << 4))
+
+struct rt1308_sdw_priv {
+	struct snd_soc_component *component;
+	struct regmap *regmap;
+	struct sdw_slave *sdw_slave;
+	enum sdw_slave_status status;
+	struct sdw_bus_params params;
+	bool hw_init;
+	bool first_hw_init;
+};
+
+struct sdw_stream_data {
+	struct sdw_stream_runtime *sdw_stream;
+};
+
+#endif /* __RT1308_SDW_H__ */