[PATCH v4 5/9] ASoC: codecs: wcd938x-sdw: add SoundWire driver

[Srinivas Kandagatla]

This patch adds support to SoundWire devices on WCD9380/WCD9385 Codec

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
---
 sound/soc/codecs/Kconfig       |   9 ++
 sound/soc/codecs/Makefile      |   2 +
 sound/soc/codecs/wcd938x-sdw.c | 230 +++++++++++++++++++++++++++++++++
 3 files changed, 241 insertions(+)
 create mode 100644 sound/soc/codecs/wcd938x-sdw.c

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index e81950c735ce..ca640d7a6064 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -1537,6 +1537,15 @@ config SND_SOC_WCD934X
 config SND_SOC_WCD938X
 	tristate
 
+config SND_SOC_WCD938X_SDW
+	tristate "WCD9380/WCD9385 Codec - SDW
+	select SND_SOC_WCD938X
+	depends on SOUNDWIRE
+	select REGMAP_SOUNDWIRE
+	help
+	  The WCD9380/9385 is a audio codec IC Integrated in
+	  Qualcomm SoCs like SM8250.
+
 config SND_SOC_WL1273
 	tristate
 
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index e4334626c2d6..2440846f8811 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -253,6 +253,7 @@ snd-soc-uda1380-objs := uda1380.o
 snd-soc-wcd9335-objs := wcd-clsh-v2.o wcd9335.o
 snd-soc-wcd934x-objs := wcd-clsh-v2.o wcd934x.o
 snd-soc-wcd938x-objs := wcd938x.o wcd-clsh-v2.o
+snd-soc-wcd938x-sdw-objs := wcd938x-sdw.o
 snd-soc-wl1273-objs := wl1273.o
 snd-soc-wm-adsp-objs := wm_adsp.o
 snd-soc-wm0010-objs := wm0010.o
@@ -576,6 +577,7 @@ obj-$(CONFIG_SND_SOC_UDA1380)	+= snd-soc-uda1380.o
 obj-$(CONFIG_SND_SOC_WCD9335)	+= snd-soc-wcd9335.o
 obj-$(CONFIG_SND_SOC_WCD934X)	+= snd-soc-wcd934x.o
 obj-$(CONFIG_SND_SOC_WCD938X)	+= snd-soc-wcd938x.o
+obj-$(CONFIG_SND_SOC_WCD938X_SDW) += snd-soc-wcd938x-sdw.o
 obj-$(CONFIG_SND_SOC_WL1273)	+= snd-soc-wl1273.o
 obj-$(CONFIG_SND_SOC_WM0010)	+= snd-soc-wm0010.o
 obj-$(CONFIG_SND_SOC_WM1250_EV1) += snd-soc-wm1250-ev1.o
diff --git a/sound/soc/codecs/wcd938x-sdw.c b/sound/soc/codecs/wcd938x-sdw.c
new file mode 100644
index 000000000000..73a22e889d37
--- /dev/null
+++ b/sound/soc/codecs/wcd938x-sdw.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2021, Linaro Limited
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/component.h>
+#include <sound/soc.h>
+#include <linux/pm_runtime.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_type.h>
+#include <linux/soundwire/sdw_registers.h>
+#include <linux/regmap.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include "wcd938x.h"
+
+#define SWRS_SCP_HOST_CLK_DIV2_CTL_BANK(m) (0xE0 + 0x10 * (m))
+
+static struct wcd938x_sdw_ch_info wcd938x_sdw_rx_ch_info[] = {
+	WCD_SDW_CH(WCD938X_HPH_L, WCD938X_HPH_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_HPH_R, WCD938X_HPH_PORT, BIT(1)),
+	WCD_SDW_CH(WCD938X_CLSH, WCD938X_CLSH_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_COMP_L, WCD938X_COMP_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_COMP_R, WCD938X_COMP_PORT, BIT(1)),
+	WCD_SDW_CH(WCD938X_LO, WCD938X_LO_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_DSD_L, WCD938X_DSD_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_DSD_R, WCD938X_DSD_PORT, BIT(1)),
+};
+
+static struct wcd938x_sdw_ch_info wcd938x_sdw_tx_ch_info[] = {
+	WCD_SDW_CH(WCD938X_ADC1, WCD938X_ADC_1_2_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_ADC2, WCD938X_ADC_1_2_PORT, BIT(1)),
+	WCD_SDW_CH(WCD938X_ADC3, WCD938X_ADC_3_4_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_ADC4, WCD938X_ADC_3_4_PORT, BIT(1)),
+	WCD_SDW_CH(WCD938X_DMIC0, WCD938X_DMIC_0_3_MBHC_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_DMIC1, WCD938X_DMIC_0_3_MBHC_PORT, BIT(1)),
+	WCD_SDW_CH(WCD938X_MBHC, WCD938X_DMIC_0_3_MBHC_PORT, BIT(2)),
+	WCD_SDW_CH(WCD938X_DMIC2, WCD938X_DMIC_0_3_MBHC_PORT, BIT(2)),
+	WCD_SDW_CH(WCD938X_DMIC3, WCD938X_DMIC_0_3_MBHC_PORT, BIT(3)),
+	WCD_SDW_CH(WCD938X_DMIC4, WCD938X_DMIC_4_7_PORT, BIT(0)),
+	WCD_SDW_CH(WCD938X_DMIC5, WCD938X_DMIC_4_7_PORT, BIT(1)),
+	WCD_SDW_CH(WCD938X_DMIC6, WCD938X_DMIC_4_7_PORT, BIT(2)),
+	WCD_SDW_CH(WCD938X_DMIC7, WCD938X_DMIC_4_7_PORT, BIT(3)),
+};
+
+static struct sdw_dpn_prop wcd938x_dpn_prop[WCD938X_MAX_SWR_PORTS] = {
+	{
+		.num = 1,
+		.type = SDW_DPN_SIMPLE,
+		.min_ch = 1,
+		.max_ch = 8,
+		.simple_ch_prep_sm = true,
+	}, {
+		.num = 2,
+		.type = SDW_DPN_SIMPLE,
+		.min_ch = 1,
+		.max_ch = 4,
+		.simple_ch_prep_sm = true,
+	}, {
+		.num = 3,
+		.type = SDW_DPN_SIMPLE,
+		.min_ch = 1,
+		.max_ch = 4,
+		.simple_ch_prep_sm = true,
+	}, {
+		.num = 4,
+		.type = SDW_DPN_SIMPLE,
+		.min_ch = 1,
+		.max_ch = 4,
+		.simple_ch_prep_sm = true,
+	}, {
+		.num = 5,
+		.type = SDW_DPN_SIMPLE,
+		.min_ch = 1,
+		.max_ch = 4,
+		.simple_ch_prep_sm = true,
+	}
+};
+
+static int wcd9380_update_status(struct sdw_slave *slave,
+				 enum sdw_slave_status status)
+{
+	return 0;
+}
+
+static int wcd9380_bus_config(struct sdw_slave *slave,
+			      struct sdw_bus_params *params)
+{
+	sdw_write(slave, SWRS_SCP_HOST_CLK_DIV2_CTL_BANK(params->next_bank),  0x01);
+
+	return 0;
+}
+
+static int wcd9380_interrupt_callback(struct sdw_slave *slave,
+				      struct sdw_slave_intr_status *status)
+{
+	struct wcd938x_sdw_priv *wcd = dev_get_drvdata(&slave->dev);
+
+	return wcd938x_handle_sdw_irq(wcd);
+}
+
+static struct sdw_slave_ops wcd9380_slave_ops = {
+	.update_status = wcd9380_update_status,
+	.interrupt_callback = wcd9380_interrupt_callback,
+	.bus_config = wcd9380_bus_config,
+};
+
+static int wcd938x_sdw_component_bind(struct device *dev,
+				      struct device *master, void *data)
+{
+	return 0;
+}
+
+static void wcd938x_sdw_component_unbind(struct device *dev,
+					 struct device *master, void *data)
+{
+}
+
+static const struct component_ops wcd938x_sdw_component_ops = {
+	.bind   = wcd938x_sdw_component_bind,
+	.unbind = wcd938x_sdw_component_unbind,
+};
+
+static int wcd9380_probe(struct sdw_slave *pdev,
+			 const struct sdw_device_id *id)
+{
+	struct device *dev = &pdev->dev;
+	struct wcd938x_sdw_priv *wcd;
+	const char *dir = "rx";
+	int ret;
+
+	wcd = devm_kzalloc(dev, sizeof(*wcd), GFP_KERNEL);
+	if (!wcd)
+		return -ENOMEM;
+
+	of_property_read_string(dev->of_node, "qcom,direction", &dir);
+	if (!strcmp(dir, "tx"))
+		wcd->is_tx = true;
+	else
+		wcd->is_tx = false;
+
+
+	ret = of_property_read_variable_u32_array(dev->of_node, "qcom,port-mapping",
+						  wcd->port_map,
+						  WCD938X_MAX_TX_SWR_PORTS,
+						  WCD938X_MAX_SWR_PORTS);
+	if (ret)
+		dev_info(dev, "Static Port mapping not specified\n");
+
+	wcd->sdev = pdev;
+	dev_set_drvdata(dev, wcd);
+
+	pdev->prop.scp_int1_mask = SDW_SCP_INT1_IMPL_DEF |
+					SDW_SCP_INT1_BUS_CLASH |
+					SDW_SCP_INT1_PARITY;
+	pdev->prop.lane_control_support = true;
+	if (wcd->is_tx) {
+		pdev->prop.source_ports = GENMASK(WCD938X_MAX_SWR_PORTS, 0);
+		pdev->prop.src_dpn_prop = wcd938x_dpn_prop;
+		wcd->ch_info = &wcd938x_sdw_tx_ch_info[0];
+		pdev->prop.wake_capable = true;
+	} else {
+		pdev->prop.sink_ports = GENMASK(WCD938X_MAX_SWR_PORTS, 0);
+		pdev->prop.sink_dpn_prop = wcd938x_dpn_prop;
+		wcd->ch_info = &wcd938x_sdw_rx_ch_info[0];
+	}
+
+	pm_runtime_set_autosuspend_delay(dev, 3000);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	return component_add(dev, &wcd938x_sdw_component_ops);
+}
+
+static const struct sdw_device_id wcd9380_slave_id[] = {
+	SDW_SLAVE_ENTRY(0x0217, 0x10d, 0),
+	{},
+};
+MODULE_DEVICE_TABLE(sdw, wcd9380_slave_id);
+
+static int __maybe_unused wcd938x_sdw_runtime_suspend(struct device *dev)
+{
+	struct regmap *regmap = dev_get_regmap(dev, NULL);
+
+	if (regmap) {
+		regcache_cache_only(regmap, true);
+		regcache_mark_dirty(regmap);
+	}
+	return 0;
+}
+
+static int __maybe_unused wcd938x_sdw_runtime_resume(struct device *dev)
+{
+	struct regmap *regmap = dev_get_regmap(dev, NULL);
+
+	if (regmap) {
+		regcache_cache_only(regmap, false);
+		regcache_sync(regmap);
+	}
+
+	pm_runtime_mark_last_busy(dev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops wcd938x_sdw_pm_ops = {
+	SET_RUNTIME_PM_OPS(wcd938x_sdw_runtime_suspend, wcd938x_sdw_runtime_resume, NULL)
+};
+
+
+static struct sdw_driver wcd9380_codec_driver = {
+	.probe	= wcd9380_probe,
+	.ops = &wcd9380_slave_ops,
+	.id_table = wcd9380_slave_id,
+	.driver = {
+		.name	= "wcd9380-codec",
+		.pm = &wcd938x_sdw_pm_ops,
+	}
+};
+module_sdw_driver(wcd9380_codec_driver);
+
+MODULE_DESCRIPTION("WCD938X SDW codec driver");
+MODULE_LICENSE("GPL");
-- 
2.21.0