sound/soc/atmel/tse850-pcm5142.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 //
 // TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec
 //
 // Copyright (C) 2016 Axentia Technologies AB
 //
 // Author: Peter Rosin <peda@axentia.se>
 //
 //               loop1 relays
 //   IN1 +---o  +------------+  o---+ OUT1
 //            \                /
 //             +              +
 //             |   /          |
 //             +--o  +--.     |
 //             |  add   |     |
 //             |        V     |
 //             |      .---.   |
 //   DAC +----------->|Sum|---+
 //             |      '---'   |
 //             |              |
 //             +              +
 //
 //   IN2 +---o--+------------+--o---+ OUT2
 //               loop2 relays
 //
 // The 'loop1' gpio pin controls two relays, which are either in loop
 // position, meaning that input and output are directly connected, or
 // they are in mixer position, meaning that the signal is passed through
 // the 'Sum' mixer. Similarly for 'loop2'.
 //
 // In the above, the 'loop1' relays are inactive, thus feeding IN1 to the
 // mixer (if 'add' is active) and feeding the mixer output to OUT1. The
 // 'loop2' relays are active, short-cutting the TSE-850 from channel 2.
 // IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name
 // of the (filtered) output from the PCM5142 codec.

 #include <linux/clk.h>
 #include <linux/gpio.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/regulator/consumer.h>

 #include <sound/soc.h>
 #include <sound/pcm_params.h>

 struct tse850_priv {
 	struct gpio_desc *add;
 	struct gpio_desc *loop1;
 	struct gpio_desc *loop2;

 	struct regulator *ana;

 	int add_cache;
 	int loop1_cache;
 	int loop2_cache;
 };

 static int tse850_get_mux1(struct snd_kcontrol *kctrl,
 			   struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

 	ucontrol->value.enumerated.item[0] = tse850->loop1_cache;

 	return 0;
 }

 static int tse850_put_mux1(struct snd_kcontrol *kctrl,
 			   struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 	struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
 	unsigned int val = ucontrol->value.enumerated.item[0];

 	if (val >= e->items)
 		return -EINVAL;

 	gpiod_set_value_cansleep(tse850->loop1, val);
 	tse850->loop1_cache = val;

 	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
 }

 static int tse850_get_mux2(struct snd_kcontrol *kctrl,
 			   struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

 	ucontrol->value.enumerated.item[0] = tse850->loop2_cache;

 	return 0;
 }

 static int tse850_put_mux2(struct snd_kcontrol *kctrl,
 			   struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 	struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
 	unsigned int val = ucontrol->value.enumerated.item[0];

 	if (val >= e->items)
 		return -EINVAL;

 	gpiod_set_value_cansleep(tse850->loop2, val);
 	tse850->loop2_cache = val;

 	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
 }

 static int tse850_get_mix(struct snd_kcontrol *kctrl,
 			  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

 	ucontrol->value.enumerated.item[0] = tse850->add_cache;

 	return 0;
 }

 static int tse850_put_mix(struct snd_kcontrol *kctrl,
 			  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 	int connect = !!ucontrol->value.integer.value[0];

 	if (tse850->add_cache == connect)
 		return 0;

 	/*
 	 * Hmmm, this gpiod_set_value_cansleep call should probably happen
 	 * inside snd_soc_dapm_mixer_update_power in the loop.
 	 */
 	gpiod_set_value_cansleep(tse850->add, connect);
 	tse850->add_cache = connect;

 	snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
 	return 1;
 }

 static int tse850_get_ana(struct snd_kcontrol *kctrl,
 			  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 	int ret;

 	ret = regulator_get_voltage(tse850->ana);
 	if (ret < 0)
 		return ret;

 	/*
 	 * Map regulator output values like so:
 	 *      -11.5V to "Low" (enum 0)
 	 * 11.5V-12.5V to "12V" (enum 1)
 	 * 12.5V-13.5V to "13V" (enum 2)
 	 *     ...
 	 * 18.5V-19.5V to "19V" (enum 8)
 	 * 19.5V-      to "20V" (enum 9)
 	 */
 	if (ret < 11000000)
 		ret = 11000000;
 	else if (ret > 20000000)
 		ret = 20000000;
 	ret -= 11000000;
 	ret = (ret + 500000) / 1000000;

 	ucontrol->value.enumerated.item[0] = ret;

 	return 0;
 }

 static int tse850_put_ana(struct snd_kcontrol *kctrl,
 			  struct snd_ctl_elem_value *ucontrol)
 {
 	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
 	struct snd_soc_card *card = dapm->card;
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
 	struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
 	unsigned int uV = ucontrol->value.enumerated.item[0];
 	int ret;

 	if (uV >= e->items)
 		return -EINVAL;

 	/*
 	 * Map enum zero (Low) to 2 volts on the regulator, do this since
 	 * the ana regulator is supplied by the system 12V voltage and
 	 * requesting anything below the system voltage causes the system
 	 * voltage to be passed through the regulator. Also, the ana
 	 * regulator induces noise when requesting voltages near the
 	 * system voltage. So, by mapping Low to 2V, that noise is
 	 * eliminated when all that is needed is 12V (the system voltage).
 	 */
 	if (uV)
 		uV = 11000000 + (1000000 * uV);
 	else
 		uV = 2000000;

 	ret = regulator_set_voltage(tse850->ana, uV, uV);
 	if (ret < 0)
 		return ret;

 	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
 }

 static const char * const mux_text[] = { "Mixer", "Loop" };

 static const struct soc_enum mux_enum =
 	SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);

 static const struct snd_kcontrol_new mux1 =
 	SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);

 static const struct snd_kcontrol_new mux2 =
 	SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);

 #define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
 {	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
 	.info = snd_soc_info_volsw, \
 	.get = xget, \
 	.put = xput, \
 	.private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }

 static const struct snd_kcontrol_new mix[] = {
 	TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
 			       tse850_get_mix, tse850_put_mix),
 };

 static const char * const ana_text[] = {
 	"Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
 };

 static const struct soc_enum ana_enum =
 	SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);

 static const struct snd_kcontrol_new out =
 	SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);

 static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
 	SND_SOC_DAPM_LINE("OUT1", NULL),
 	SND_SOC_DAPM_LINE("OUT2", NULL),
 	SND_SOC_DAPM_LINE("IN1", NULL),
 	SND_SOC_DAPM_LINE("IN2", NULL),
 	SND_SOC_DAPM_INPUT("DAC"),
 	SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
 	SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
 	SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
 	SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
 	SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
 	SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
 };

 /*
  * These connections are not entirely correct, since both IN1 and IN2
  * are always fed to MIX (if the "IN switch" is set so), i.e. without
  * regard to the loop1 and loop2 relays that according to this only
  * control MUX1 and MUX2 but in fact also control how the input signals
  * are routed.
  * But, 1) I don't know how to do it right, and 2) it doesn't seem to
  * matter in practice since nothing is powered in those sections anyway.
  */
 static const struct snd_soc_dapm_route tse850_intercon[] = {
 	{ "OUT1", NULL, "MUX1" },
 	{ "OUT2", NULL, "MUX2" },

 	{ "MUX1", "Loop",  "IN1" },
 	{ "MUX1", "Mixer", "OUT" },

 	{ "MUX2", "Loop",  "IN2" },
 	{ "MUX2", "Mixer", "OUT" },

 	{ "OUT", NULL, "MIX" },

 	{ "MIX", NULL, "DAC" },
 	{ "MIX", "IN Switch", "IN1" },
 	{ "MIX", "IN Switch", "IN2" },

 	/* connect board input to the codec left channel output pin */
 	{ "DAC", NULL, "OUTL" },
 };

 SND_SOC_DAILINK_DEFS(pcm,
 	DAILINK_COMP_ARRAY(COMP_EMPTY()),
 	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "pcm512x-hifi")),
 	DAILINK_COMP_ARRAY(COMP_EMPTY()));

 static struct snd_soc_dai_link tse850_dailink = {
 	.name = "TSE-850",
 	.stream_name = "TSE-850-PCM",
 	.dai_fmt = SND_SOC_DAIFMT_I2S
 		 | SND_SOC_DAIFMT_NB_NF
 		 | SND_SOC_DAIFMT_CBP_CFC,
 	SND_SOC_DAILINK_REG(pcm),
 };

 static struct snd_soc_card tse850_card = {
 	.name = "TSE-850-ASoC",
 	.owner = THIS_MODULE,
 	.dai_link = &tse850_dailink,
 	.num_links = 1,
 	.dapm_widgets = tse850_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
 	.dapm_routes = tse850_intercon,
 	.num_dapm_routes = ARRAY_SIZE(tse850_intercon),
 	.fully_routed = true,
 };

 static int tse850_dt_init(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct device_node *codec_np, *cpu_np;
 	struct snd_soc_dai_link *dailink = &tse850_dailink;

 	if (!np) {
 		dev_err(&pdev->dev, "only device tree supported\n");
 		return -EINVAL;
 	}

 	cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0);
 	if (!cpu_np) {
 		dev_err(&pdev->dev, "failed to get cpu dai\n");
 		return -EINVAL;
 	}
 	dailink->cpus->of_node = cpu_np;
 	dailink->platforms->of_node = cpu_np;
 	of_node_put(cpu_np);

 	codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
 	if (!codec_np) {
 		dev_err(&pdev->dev, "failed to get codec info\n");
 		return -EINVAL;
 	}
 	dailink->codecs->of_node = codec_np;
 	of_node_put(codec_np);

 	return 0;
 }

 static int tse850_probe(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = &tse850_card;
 	struct device *dev = card->dev = &pdev->dev;
 	struct tse850_priv *tse850;
 	int ret;

 	tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
 	if (!tse850)
 		return -ENOMEM;

 	snd_soc_card_set_drvdata(card, tse850);

 	ret = tse850_dt_init(pdev);
 	if (ret) {
 		dev_err(dev, "failed to init dt info\n");
 		return ret;
 	}

 	tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
 	if (IS_ERR(tse850->add))
 		return dev_err_probe(dev, PTR_ERR(tse850->add),
 				     "failed to get 'add' gpio\n");
 	tse850->add_cache = 1;

 	tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
 	if (IS_ERR(tse850->loop1))
 		return dev_err_probe(dev, PTR_ERR(tse850->loop1),
 				     "failed to get 'loop1' gpio\n");
 	tse850->loop1_cache = 1;

 	tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
 	if (IS_ERR(tse850->loop2))
 		return dev_err_probe(dev, PTR_ERR(tse850->loop2),
 				     "failed to get 'loop2' gpio\n");
 	tse850->loop2_cache = 1;

 	tse850->ana = devm_regulator_get(dev, "axentia,ana");
 	if (IS_ERR(tse850->ana))
 		return dev_err_probe(dev, PTR_ERR(tse850->ana),
 				     "failed to get 'ana' regulator\n");

 	ret = regulator_enable(tse850->ana);
 	if (ret < 0) {
 		dev_err(dev, "failed to enable the 'ana' regulator\n");
 		return ret;
 	}

 	ret = snd_soc_register_card(card);
 	if (ret) {
 		dev_err(dev, "snd_soc_register_card failed\n");
 		goto err_disable_ana;
 	}

 	return 0;

 err_disable_ana:
 	regulator_disable(tse850->ana);
 	return ret;
 }

 static int tse850_remove(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = platform_get_drvdata(pdev);
 	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

 	snd_soc_unregister_card(card);
 	regulator_disable(tse850->ana);

 	return 0;
 }

 static const struct of_device_id tse850_dt_ids[] = {
 	{ .compatible = "axentia,tse850-pcm5142", },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, tse850_dt_ids);

 static struct platform_driver tse850_driver = {
 	.driver = {
 		.name = "axentia-tse850-pcm5142",
 		.of_match_table = of_match_ptr(tse850_dt_ids),
 	},
 	.probe = tse850_probe,
 	.remove = tse850_remove,
 };

 module_platform_driver(tse850_driver);

 /* Module information */
 MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
 MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	//
	// TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec
	//
	// Copyright (C) 2016 Axentia Technologies AB
	//
	// Author: Peter Rosin <peda@axentia.se>
	//
	// loop1 relays
	// IN1 +---o +------------+ o---+ OUT1
	// \ /
	// + +
	// \| / \|
	// +--o +--. \|
	// \| add \| \|
	// \| V \|
	// \| .---. \|
	// DAC +----------->\|Sum\|---+
	// \| '---' \|
	// \| \|
	// + +
	//
	// IN2 +---o--+------------+--o---+ OUT2
	// loop2 relays
	//
	// The 'loop1' gpio pin controls two relays, which are either in loop
	// position, meaning that input and output are directly connected, or
	// they are in mixer position, meaning that the signal is passed through
	// the 'Sum' mixer. Similarly for 'loop2'.
	//
	// In the above, the 'loop1' relays are inactive, thus feeding IN1 to the
	// mixer (if 'add' is active) and feeding the mixer output to OUT1. The
	// 'loop2' relays are active, short-cutting the TSE-850 from channel 2.
	// IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name
	// of the (filtered) output from the PCM5142 codec.

	#include <linux/clk.h>
	#include <linux/gpio.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/of_gpio.h>
	#include <linux/regulator/consumer.h>

	#include <sound/soc.h>
	#include <sound/pcm_params.h>

	struct tse850_priv {
	struct gpio_desc *add;
	struct gpio_desc *loop1;
	struct gpio_desc *loop2;

	struct regulator *ana;

	int add_cache;
	int loop1_cache;
	int loop2_cache;
	};

	static int tse850_get_mux1(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	ucontrol->value.enumerated.item[0] = tse850->loop1_cache;

	return 0;
	}

	static int tse850_put_mux1(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	struct soc_enum e = (struct soc_enum )kctrl->private_value;
	unsigned int val = ucontrol->value.enumerated.item[0];

	if (val >= e->items)
	return -EINVAL;

	gpiod_set_value_cansleep(tse850->loop1, val);
	tse850->loop1_cache = val;

	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
	}

	static int tse850_get_mux2(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	ucontrol->value.enumerated.item[0] = tse850->loop2_cache;

	return 0;
	}

	static int tse850_put_mux2(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	struct soc_enum e = (struct soc_enum )kctrl->private_value;
	unsigned int val = ucontrol->value.enumerated.item[0];

	if (val >= e->items)
	return -EINVAL;

	gpiod_set_value_cansleep(tse850->loop2, val);
	tse850->loop2_cache = val;

	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
	}

	static int tse850_get_mix(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	ucontrol->value.enumerated.item[0] = tse850->add_cache;

	return 0;
	}

	static int tse850_put_mix(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	int connect = !!ucontrol->value.integer.value[0];

	if (tse850->add_cache == connect)
	return 0;

	/*
	* Hmmm, this gpiod_set_value_cansleep call should probably happen
	* inside snd_soc_dapm_mixer_update_power in the loop.
	*/
	gpiod_set_value_cansleep(tse850->add, connect);
	tse850->add_cache = connect;

	snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
	return 1;
	}

	static int tse850_get_ana(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	int ret;

	ret = regulator_get_voltage(tse850->ana);
	if (ret < 0)
	return ret;

	/*
	* Map regulator output values like so:
	* -11.5V to "Low" (enum 0)
	* 11.5V-12.5V to "12V" (enum 1)
	* 12.5V-13.5V to "13V" (enum 2)
	* ...
	* 18.5V-19.5V to "19V" (enum 8)
	* 19.5V- to "20V" (enum 9)
	*/
	if (ret < 11000000)
	ret = 11000000;
	else if (ret > 20000000)
	ret = 20000000;
	ret -= 11000000;
	ret = (ret + 500000) / 1000000;

	ucontrol->value.enumerated.item[0] = ret;

	return 0;
	}

	static int tse850_put_ana(struct snd_kcontrol *kctrl,
	struct snd_ctl_elem_value *ucontrol)
	{
	struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
	struct snd_soc_card *card = dapm->card;
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
	struct soc_enum e = (struct soc_enum )kctrl->private_value;
	unsigned int uV = ucontrol->value.enumerated.item[0];
	int ret;

	if (uV >= e->items)
	return -EINVAL;

	/*
	* Map enum zero (Low) to 2 volts on the regulator, do this since
	* the ana regulator is supplied by the system 12V voltage and
	* requesting anything below the system voltage causes the system
	* voltage to be passed through the regulator. Also, the ana
	* regulator induces noise when requesting voltages near the
	* system voltage. So, by mapping Low to 2V, that noise is
	* eliminated when all that is needed is 12V (the system voltage).
	*/
	if (uV)
	uV = 11000000 + (1000000 * uV);
	else
	uV = 2000000;

	ret = regulator_set_voltage(tse850->ana, uV, uV);
	if (ret < 0)
	return ret;

	return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
	}

	static const char * const mux_text[] = { "Mixer", "Loop" };

	static const struct soc_enum mux_enum =
	SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);

	static const struct snd_kcontrol_new mux1 =
	SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);

	static const struct snd_kcontrol_new mux2 =
	SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);

	#define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
	{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
	.info = snd_soc_info_volsw, \
	.get = xget, \
	.put = xput, \
	.private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }

	static const struct snd_kcontrol_new mix[] = {
	TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
	tse850_get_mix, tse850_put_mix),
	};

	static const char * const ana_text[] = {
	"Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
	};

	static const struct soc_enum ana_enum =
	SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);

	static const struct snd_kcontrol_new out =
	SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);

	static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
	SND_SOC_DAPM_LINE("OUT1", NULL),
	SND_SOC_DAPM_LINE("OUT2", NULL),
	SND_SOC_DAPM_LINE("IN1", NULL),
	SND_SOC_DAPM_LINE("IN2", NULL),
	SND_SOC_DAPM_INPUT("DAC"),
	SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
	SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
	SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
	SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
	SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
	};

	/*
	* These connections are not entirely correct, since both IN1 and IN2
	* are always fed to MIX (if the "IN switch" is set so), i.e. without
	* regard to the loop1 and loop2 relays that according to this only
	* control MUX1 and MUX2 but in fact also control how the input signals
	* are routed.
	* But, 1) I don't know how to do it right, and 2) it doesn't seem to
	* matter in practice since nothing is powered in those sections anyway.
	*/
	static const struct snd_soc_dapm_route tse850_intercon[] = {
	{ "OUT1", NULL, "MUX1" },
	{ "OUT2", NULL, "MUX2" },

	{ "MUX1", "Loop", "IN1" },
	{ "MUX1", "Mixer", "OUT" },

	{ "MUX2", "Loop", "IN2" },
	{ "MUX2", "Mixer", "OUT" },

	{ "OUT", NULL, "MIX" },

	{ "MIX", NULL, "DAC" },
	{ "MIX", "IN Switch", "IN1" },
	{ "MIX", "IN Switch", "IN2" },

	/* connect board input to the codec left channel output pin */
	{ "DAC", NULL, "OUTL" },
	};

	SND_SOC_DAILINK_DEFS(pcm,
	DAILINK_COMP_ARRAY(COMP_EMPTY()),
	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "pcm512x-hifi")),
	DAILINK_COMP_ARRAY(COMP_EMPTY()));

	static struct snd_soc_dai_link tse850_dailink = {
	.name = "TSE-850",
	.stream_name = "TSE-850-PCM",
	.dai_fmt = SND_SOC_DAIFMT_I2S
	\| SND_SOC_DAIFMT_NB_NF
	\| SND_SOC_DAIFMT_CBP_CFC,
	SND_SOC_DAILINK_REG(pcm),
	};

	static struct snd_soc_card tse850_card = {
	.name = "TSE-850-ASoC",
	.owner = THIS_MODULE,
	.dai_link = &tse850_dailink,
	.num_links = 1,
	.dapm_widgets = tse850_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
	.dapm_routes = tse850_intercon,
	.num_dapm_routes = ARRAY_SIZE(tse850_intercon),
	.fully_routed = true,
	};

	static int tse850_dt_init(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct device_node codec_np, cpu_np;
	struct snd_soc_dai_link *dailink = &tse850_dailink;

	if (!np) {
	dev_err(&pdev->dev, "only device tree supported\n");
	return -EINVAL;
	}

	cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0);
	if (!cpu_np) {
	dev_err(&pdev->dev, "failed to get cpu dai\n");
	return -EINVAL;
	}
	dailink->cpus->of_node = cpu_np;
	dailink->platforms->of_node = cpu_np;
	of_node_put(cpu_np);

	codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
	if (!codec_np) {
	dev_err(&pdev->dev, "failed to get codec info\n");
	return -EINVAL;
	}
	dailink->codecs->of_node = codec_np;
	of_node_put(codec_np);

	return 0;
	}

	static int tse850_probe(struct platform_device *pdev)
	{
	struct snd_soc_card *card = &tse850_card;
	struct device *dev = card->dev = &pdev->dev;
	struct tse850_priv *tse850;
	int ret;

	tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
	if (!tse850)
	return -ENOMEM;

	snd_soc_card_set_drvdata(card, tse850);

	ret = tse850_dt_init(pdev);
	if (ret) {
	dev_err(dev, "failed to init dt info\n");
	return ret;
	}

	tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
	if (IS_ERR(tse850->add))
	return dev_err_probe(dev, PTR_ERR(tse850->add),
	"failed to get 'add' gpio\n");
	tse850->add_cache = 1;

	tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
	if (IS_ERR(tse850->loop1))
	return dev_err_probe(dev, PTR_ERR(tse850->loop1),
	"failed to get 'loop1' gpio\n");
	tse850->loop1_cache = 1;

	tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
	if (IS_ERR(tse850->loop2))
	return dev_err_probe(dev, PTR_ERR(tse850->loop2),
	"failed to get 'loop2' gpio\n");
	tse850->loop2_cache = 1;

	tse850->ana = devm_regulator_get(dev, "axentia,ana");
	if (IS_ERR(tse850->ana))
	return dev_err_probe(dev, PTR_ERR(tse850->ana),
	"failed to get 'ana' regulator\n");

	ret = regulator_enable(tse850->ana);
	if (ret < 0) {
	dev_err(dev, "failed to enable the 'ana' regulator\n");
	return ret;
	}

	ret = snd_soc_register_card(card);
	if (ret) {
	dev_err(dev, "snd_soc_register_card failed\n");
	goto err_disable_ana;
	}

	return 0;

	err_disable_ana:
	regulator_disable(tse850->ana);
	return ret;
	}

	static int tse850_remove(struct platform_device *pdev)
	{
	struct snd_soc_card *card = platform_get_drvdata(pdev);
	struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);

	snd_soc_unregister_card(card);
	regulator_disable(tse850->ana);

	return 0;
	}

	static const struct of_device_id tse850_dt_ids[] = {
	{ .compatible = "axentia,tse850-pcm5142", },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, tse850_dt_ids);

	static struct platform_driver tse850_driver = {
	.driver = {
	.name = "axentia-tse850-pcm5142",
	.of_match_table = of_match_ptr(tse850_dt_ids),
	},
	.probe = tse850_probe,
	.remove = tse850_remove,
	};

	module_platform_driver(tse850_driver);

	/* Module information */
	MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
	MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
	MODULE_LICENSE("GPL v2");