ASoC: cs42l43: Add support for the cs42l43

The CS42L43 is an audio CODEC with integrated MIPI SoundWire interface
(Version 1.2.1 compliant), I2C, SPI, and I2S/TDM interfaces designed
for portable applications. It provides a high dynamic range, stereo
DAC for headphone output, two integrated Class D amplifiers for
loudspeakers, and two ADCs for wired headset microphone input or
stereo line input. PDM inputs are provided for digital microphones.

The ASoC component provides the majority of the functionality of the
device, all the audio functions.
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230804104602.395892-7-ckeepax@opensource.cirrus.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/cs42l43.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * CS42L43 CODEC driver external data
+ *
+ * Copyright (C) 2022-2023 Cirrus Logic, Inc. and
+ *                         Cirrus Logic International Semiconductor Ltd.
+ */
+
+#ifndef CS42L43_ASOC_EXT_H
+#define CS42L43_ASOC_EXT_H
+
+#define CS42L43_SYSCLK		0
+
+#define CS42L43_SYSCLK_MCLK	0
+#define CS42L43_SYSCLK_SDW	1
+
+#endif /* CS42L43_ASOC_EXT_H */

sound/soc/codecs/Kconfig

@@ -74,6 +74,8 @@ config SND_SOC_ALL_CODECS
 	imply SND_SOC_CS35L56_SDW
 	imply SND_SOC_CS42L42
 	imply SND_SOC_CS42L42_SDW
+	imply SND_SOC_CS42L43
+	imply SND_SOC_CS42L43_SDW
 	imply SND_SOC_CS42L51_I2C
 	imply SND_SOC_CS42L52
 	imply SND_SOC_CS42L56
@@ -789,6 +791,20 @@ config SND_SOC_CS42L42_SDW
 	help
 	  Enable support for Cirrus Logic CS42L42 codec with Soundwire control
 
+config SND_SOC_CS42L43
+	tristate "Cirrus Logic CS42L43 CODEC"
+	depends on MFD_CS42L43
+	help
+	  Select this to support the audio functions of the Cirrus Logic
+	  CS42L43 PC CODEC.
+
+config SND_SOC_CS42L43_SDW
+	tristate "Cirrus Logic CS42L43 CODEC (SoundWire)"
+	depends on SND_SOC_CS42L43 && MFD_CS42L43_SDW
+	help
+	  Select this to support the audio functions of the Cirrus Logic
+	  CS42L43 PC CODEC over SoundWire.
+
 config SND_SOC_CS42L51
 	tristate
 

sound/soc/codecs/Makefile

@@ -75,6 +75,8 @@ snd-soc-cs35l56-sdw-objs := cs35l56-sdw.o
 snd-soc-cs42l42-objs := cs42l42.o
 snd-soc-cs42l42-i2c-objs := cs42l42-i2c.o
 snd-soc-cs42l42-sdw-objs := cs42l42-sdw.o
+snd-soc-cs42l43-objs := cs42l43.o cs42l43-jack.o
+snd-soc-cs42l43-sdw-objs := cs42l43-sdw.o
 snd-soc-cs42l51-objs := cs42l51.o
 snd-soc-cs42l51-i2c-objs := cs42l51-i2c.o
 snd-soc-cs42l52-objs := cs42l52.o
@@ -457,6 +459,8 @@ obj-$(CONFIG_SND_SOC_CS35L56_SDW)	+= snd-soc-cs35l56-sdw.o
 obj-$(CONFIG_SND_SOC_CS42L42_CORE)	+= snd-soc-cs42l42.o
 obj-$(CONFIG_SND_SOC_CS42L42)	+= snd-soc-cs42l42-i2c.o
 obj-$(CONFIG_SND_SOC_CS42L42_SDW)	+= snd-soc-cs42l42-sdw.o
+obj-$(CONFIG_SND_SOC_CS42L43)	+= snd-soc-cs42l43.o
+obj-$(CONFIG_SND_SOC_CS42L43_SDW)	+= snd-soc-cs42l43-sdw.o
 obj-$(CONFIG_SND_SOC_CS42L51)	+= snd-soc-cs42l51.o
 obj-$(CONFIG_SND_SOC_CS42L51_I2C)	+= snd-soc-cs42l51-i2c.o
 obj-$(CONFIG_SND_SOC_CS42L52)	+= snd-soc-cs42l52.o

sound/soc/codecs/cs42l43-sdw.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// CS42L43 CODEC driver SoundWire handling
+//
+// Copyright (C) 2022-2023 Cirrus Logic, Inc. and
+//                         Cirrus Logic International Semiconductor Ltd.
+
+#include <linux/errno.h>
+#include <linux/mfd/cs42l43.h>
+#include <linux/mfd/cs42l43-regs.h>
+#include <linux/module.h>
+#include <sound/pcm.h>
+#include <sound/sdw.h>
+#include <sound/soc-component.h>
+#include <sound/soc-dai.h>
+#include <sound/soc.h>
+
+#include "cs42l43.h"
+
+int cs42l43_sdw_add_peripheral(struct snd_pcm_substream *substream,
+			       struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+	struct cs42l43_codec *priv = snd_soc_component_get_drvdata(dai->component);
+	struct sdw_stream_runtime *sdw_stream = snd_soc_dai_get_dma_data(dai, substream);
+	struct sdw_slave *sdw = dev_to_sdw_dev(priv->dev->parent);
+	struct sdw_stream_config sconfig = {0};
+	struct sdw_port_config pconfig = {0};
+	int ret;
+
+	if (!sdw_stream)
+		return -EINVAL;
+
+	snd_sdw_params_to_config(substream, params, &sconfig, &pconfig);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		pconfig.num = dai->id;
+	else
+		pconfig.num = dai->id;
+
+	ret = sdw_stream_add_slave(sdw, &sconfig, &pconfig, 1, sdw_stream);
+	if (ret) {
+		dev_err(priv->dev, "Failed to add sdw stream: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cs42l43_sdw_add_peripheral, SND_SOC_CS42L43);
+
+int cs42l43_sdw_remove_peripheral(struct snd_pcm_substream *substream,
+				  struct snd_soc_dai *dai)
+{
+	struct cs42l43_codec *priv = snd_soc_component_get_drvdata(dai->component);
+	struct sdw_stream_runtime *sdw_stream = snd_soc_dai_get_dma_data(dai, substream);
+	struct sdw_slave *sdw = dev_to_sdw_dev(priv->dev->parent);
+
+	if (!sdw_stream)
+		return -EINVAL;
+
+	return sdw_stream_remove_slave(sdw, sdw_stream);
+}
+EXPORT_SYMBOL_NS_GPL(cs42l43_sdw_remove_peripheral, SND_SOC_CS42L43);
+
+int cs42l43_sdw_set_stream(struct snd_soc_dai *dai, void *sdw_stream, int direction)
+{
+	snd_soc_dai_dma_data_set(dai, direction, sdw_stream);
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(cs42l43_sdw_set_stream, SND_SOC_CS42L43);
+
+MODULE_DESCRIPTION("CS42L43 CODEC SoundWire Driver");
+MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
+MODULE_LICENSE("GPL");

sound/soc/codecs/cs42l43.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * CS42L43 CODEC driver internal data
+ *
+ * Copyright (C) 2022-2023 Cirrus Logic, Inc. and
+ *                         Cirrus Logic International Semiconductor Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/types.h>
+#include <sound/cs42l43.h>
+#include <sound/pcm.h>
+#include <sound/soc-jack.h>
+
+#ifndef CS42L43_ASOC_INT_H
+#define CS42L43_ASOC_INT_H
+
+#define CS42L43_INTERNAL_SYSCLK		24576000
+#define CS42L43_DEFAULT_SLOTS		0x3F
+
+#define CS42L43_PLL_TIMEOUT_MS		200
+#define CS42L43_SPK_TIMEOUT_MS		100
+#define CS42L43_HP_TIMEOUT_MS		2000
+#define CS42L43_LOAD_TIMEOUT_MS		1000
+
+#define CS42L43_ASP_MAX_CHANNELS	6
+#define CS42L43_N_EQ_COEFFS		15
+
+#define CS42L43_N_BUTTONS	6
+
+struct cs42l43_codec {
+	struct device *dev;
+	struct cs42l43 *core;
+	struct snd_soc_component *component;
+
+	struct clk *mclk;
+
+	int n_slots;
+	int slot_width;
+	int tx_slots[CS42L43_ASP_MAX_CHANNELS];
+	int rx_slots[CS42L43_ASP_MAX_CHANNELS];
+	struct snd_pcm_hw_constraint_list constraint;
+
+	u32 eq_coeffs[CS42L43_N_EQ_COEFFS];
+
+	unsigned int refclk_src;
+	unsigned int refclk_freq;
+	struct completion pll_ready;
+
+	unsigned int decim_cache[4];
+	unsigned int adc_ena;
+	unsigned int hp_ena;
+
+	struct completion hp_startup;
+	struct completion hp_shutdown;
+	struct completion spkr_shutdown;
+	struct completion spkl_shutdown;
+	struct completion spkr_startup;
+	struct completion spkl_startup;
+	// Lock to ensure speaker VU updates don't clash
+	struct mutex spk_vu_lock;
+
+	// Lock for all jack detect operations
+	struct mutex jack_lock;
+	struct snd_soc_jack *jack_hp;
+
+	bool use_ring_sense;
+	unsigned int tip_debounce_ms;
+	unsigned int bias_low;
+	unsigned int bias_sense_ua;
+	unsigned int bias_ramp_ms;
+	unsigned int detect_us;
+	unsigned int buttons[CS42L43_N_BUTTONS];
+
+	struct delayed_work tip_sense_work;
+	struct delayed_work bias_sense_timeout;
+	struct delayed_work button_press_work;
+	struct work_struct button_release_work;
+	struct completion type_detect;
+	struct completion load_detect;
+
+	bool load_detect_running;
+	bool button_detect_running;
+	bool jack_present;
+	int jack_override;
+};
+
+#if IS_REACHABLE(CONFIG_SND_SOC_CS42L43_SDW)
+
+int cs42l43_sdw_add_peripheral(struct snd_pcm_substream *substream,
+			       struct snd_pcm_hw_params *params,
+			       struct snd_soc_dai *dai);
+int cs42l43_sdw_remove_peripheral(struct snd_pcm_substream *substream,
+				  struct snd_soc_dai *dai);
+int cs42l43_sdw_set_stream(struct snd_soc_dai *dai, void *sdw_stream, int direction);
+
+#else
+
+static inline int cs42l43_sdw_add_peripheral(struct snd_pcm_substream *substream,
+					     struct snd_pcm_hw_params *params,
+					     struct snd_soc_dai *dai)
+{
+	return -EINVAL;
+}
+
+#define cs42l43_sdw_remove_peripheral NULL
+#define cs42l43_sdw_set_stream NULL
+
+#endif
+
+int cs42l43_set_jack(struct snd_soc_component *component,
+		     struct snd_soc_jack *jack, void *d);
+void cs42l43_bias_sense_timeout(struct work_struct *work);
+void cs42l43_tip_sense_work(struct work_struct *work);
+void cs42l43_button_press_work(struct work_struct *work);
+void cs42l43_button_release_work(struct work_struct *work);
+irqreturn_t cs42l43_bias_detect_clamp(int irq, void *data);
+irqreturn_t cs42l43_button_press(int irq, void *data);
+irqreturn_t cs42l43_button_release(int irq, void *data);
+irqreturn_t cs42l43_tip_sense(int irq, void *data);
+int cs42l43_jack_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol);
+int cs42l43_jack_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol);
+
+extern const struct soc_enum cs42l43_jack_enum;
+
+#endif /* CS42L43_ASOC_INT_H */