[linux-2.6-block.git] / sound / soc / codecs / cx20442.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * cx20442.c  --  CX20442 ALSA Soc Audio driver
 *
 * Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
 *
 * Initially based on sound/soc/codecs/wm8400.c
 * Copyright 2008, 2009 Wolfson Microelectronics PLC.
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 */

#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>

#include <sound/core.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "cx20442.h"


struct cx20442_priv {
	struct tty_struct *tty;
	struct regulator *por;
	u8 reg_cache;
};

#define CX20442_PM		0x0

#define CX20442_TELIN		0
#define CX20442_TELOUT		1
#define CX20442_MIC		2
#define CX20442_SPKOUT		3
#define CX20442_AGC		4

static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
	SND_SOC_DAPM_OUTPUT("TELOUT"),
	SND_SOC_DAPM_OUTPUT("SPKOUT"),
	SND_SOC_DAPM_OUTPUT("AGCOUT"),

	SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),

	SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
	SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
	SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),

	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),

	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),

	SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
	SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),

	SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),

	SND_SOC_DAPM_INPUT("TELIN"),
	SND_SOC_DAPM_INPUT("MIC"),
	SND_SOC_DAPM_INPUT("AGCIN"),
};

static const struct snd_soc_dapm_route cx20442_audio_map[] = {
	{"TELOUT", NULL, "TELOUT Amp"},

	{"SPKOUT", NULL, "SPKOUT Mixer"},
	{"SPKOUT Mixer", NULL, "SPKOUT Amp"},

	{"TELOUT Amp", NULL, "DAC"},
	{"SPKOUT Amp", NULL, "DAC"},

	{"SPKOUT Mixer", NULL, "SPKOUT AGC"},
	{"SPKOUT AGC", NULL, "AGCIN"},

	{"AGCOUT", NULL, "MIC AGC"},
	{"MIC AGC", NULL, "MIC"},

	{"MIC Bias", NULL, "MIC"},
	{"Input Mixer", NULL, "MIC Bias"},

	{"TELIN Bias", NULL, "TELIN"},
	{"Input Mixer", NULL, "TELIN Bias"},

	{"ADC", NULL, "Input Mixer"},
};

static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component,
					   unsigned int reg)
{
	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);

	if (reg >= 1)
		return -EINVAL;

	return cx20442->reg_cache;
}

enum v253_vls {
	V253_VLS_NONE = 0,
	V253_VLS_T,
	V253_VLS_L,
	V253_VLS_LT,
	V253_VLS_S,
	V253_VLS_ST,
	V253_VLS_M,
	V253_VLS_MST,
	V253_VLS_S1,
	V253_VLS_S1T,
	V253_VLS_MS1T,
	V253_VLS_M1,
	V253_VLS_M1ST,
	V253_VLS_M1S1T,
	V253_VLS_H,
	V253_VLS_HT,
	V253_VLS_MS,
	V253_VLS_MS1,
	V253_VLS_M1S,
	V253_VLS_M1S1,
	V253_VLS_TEST,
};

static int cx20442_pm_to_v253_vls(u8 value)
{
	switch (value & ~(1 << CX20442_AGC)) {
	case 0:
		return V253_VLS_T;
	case (1 << CX20442_SPKOUT):
	case (1 << CX20442_MIC):
	case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
		return V253_VLS_M1S1;
	case (1 << CX20442_TELOUT):
	case (1 << CX20442_TELIN):
	case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
		return V253_VLS_L;
	case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
		return V253_VLS_NONE;
	}
	return -EINVAL;
}
static int cx20442_pm_to_v253_vsp(u8 value)
{
	switch (value & ~(1 << CX20442_AGC)) {
	case (1 << CX20442_SPKOUT):
	case (1 << CX20442_MIC):
	case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
		return (bool)(value & (1 << CX20442_AGC));
	}
	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
}

static int cx20442_write(struct snd_soc_component *component, unsigned int reg,
							unsigned int value)
{
	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
	int vls, vsp, old, len;
	char buf[18];

	if (reg >= 1)
		return -EINVAL;

	/* tty and write pointers required for talking to the modem
	 * are expected to be set by the line discipline initialization code */
	if (!cx20442->tty || !cx20442->tty->ops->write)
		return -EIO;

	old = cx20442->reg_cache;
	cx20442->reg_cache = value;

	vls = cx20442_pm_to_v253_vls(value);
	if (vls < 0)
		return vls;

	vsp = cx20442_pm_to_v253_vsp(value);
	if (vsp < 0)
		return vsp;

	if ((vls == V253_VLS_T) ||
			(vls == cx20442_pm_to_v253_vls(old))) {
		if (vsp == cx20442_pm_to_v253_vsp(old))
			return 0;
		len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
	} else if (vsp == cx20442_pm_to_v253_vsp(old))
		len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
	else
		len = snprintf(buf, ARRAY_SIZE(buf),
					"at+vls=%d;+vsp=%d\r", vls, vsp);

	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
		return -ENOMEM;

	dev_dbg(component->dev, "%s: %s\n", __func__, buf);
	if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)
		return -EIO;

	return 0;
}

/*
 * Line discpline related code
 *
 * Any of the callback functions below can be used in two ways:
 * 1) registerd by a machine driver as one of line discipline operations,
 * 2) called from a machine's provided line discipline callback function
 *    in case when extra machine specific code must be run as well.
 */

/* Modem init: echo off, digital speaker off, quiet off, voice mode */
static const char *v253_init = "ate0m0q0+fclass=8\r";

/* Line discipline .open() */
static int v253_open(struct tty_struct *tty)
{
	int ret, len = strlen(v253_init);

	/* Doesn't make sense without write callback */
	if (!tty->ops->write)
		return -EINVAL;

	/* Won't work if no codec pointer has been passed by a card driver */
	if (!tty->disc_data)
		return -ENODEV;

	tty->receive_room = 16;
	if (tty->ops->write(tty, v253_init, len) != len) {
		ret = -EIO;
		goto err;
	}
	/* Actual setup will be performed after the modem responds. */
	return 0;
err:
	tty->disc_data = NULL;
	return ret;
}

/* Line discipline .close() */
static void v253_close(struct tty_struct *tty)
{
	struct snd_soc_component *component = tty->disc_data;
	struct cx20442_priv *cx20442;

	tty->disc_data = NULL;

	if (!component)
		return;

	cx20442 = snd_soc_component_get_drvdata(component);

	/* Prevent the codec driver from further accessing the modem */
	cx20442->tty = NULL;
	component->card->pop_time = 0;
}

/* Line discipline .hangup() */
static int v253_hangup(struct tty_struct *tty)
{
	v253_close(tty);
	return 0;
}

/* Line discipline .receive_buf() */
static void v253_receive(struct tty_struct *tty,
				const unsigned char *cp, char *fp, int count)
{
	struct snd_soc_component *component = tty->disc_data;
	struct cx20442_priv *cx20442;

	if (!component)
		return;

	cx20442 = snd_soc_component_get_drvdata(component);

	if (!cx20442->tty) {
		/* First modem response, complete setup procedure */

		/* Set up codec driver access to modem controls */
		cx20442->tty = tty;
		component->card->pop_time = 1;
	}
}

/* Line discipline .write_wakeup() */
static void v253_wakeup(struct tty_struct *tty)
{
}

struct tty_ldisc_ops v253_ops = {
	.magic = TTY_LDISC_MAGIC,
	.name = "cx20442",
	.owner = THIS_MODULE,
	.open = v253_open,
	.close = v253_close,
	.hangup = v253_hangup,
	.receive_buf = v253_receive,
	.write_wakeup = v253_wakeup,
};
EXPORT_SYMBOL_GPL(v253_ops);


/*
 * Codec DAI
 */

static struct snd_soc_dai_driver cx20442_dai = {
	.name = "cx20442-voice",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
};

static int cx20442_set_bias_level(struct snd_soc_component *component,
		enum snd_soc_bias_level level)
{
	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
	int err = 0;

	switch (level) {
	case SND_SOC_BIAS_PREPARE:
		if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY)
			break;
		if (IS_ERR(cx20442->por))
			err = PTR_ERR(cx20442->por);
		else
			err = regulator_enable(cx20442->por);
		break;
	case SND_SOC_BIAS_STANDBY:
		if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE)
			break;
		if (IS_ERR(cx20442->por))
			err = PTR_ERR(cx20442->por);
		else
			err = regulator_disable(cx20442->por);
		break;
	default:
		break;
	}

	return err;
}

static int cx20442_component_probe(struct snd_soc_component *component)
{
	struct cx20442_priv *cx20442;

	cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
	if (cx20442 == NULL)
		return -ENOMEM;

	cx20442->por = regulator_get(component->dev, "POR");
	if (IS_ERR(cx20442->por)) {
		int err = PTR_ERR(cx20442->por);

		dev_warn(component->dev, "failed to get POR supply (%d)", err);
		/*
		 * When running on a non-dt platform and requested regulator
		 * is not available, regulator_get() never returns
		 * -EPROBE_DEFER as it is not able to justify if the regulator
		 * may still appear later.  On the other hand, the board can
		 * still set full constraints flag at late_initcall in order
		 * to instruct regulator_get() to return a dummy one if
		 * sufficient.  Hence, if we get -ENODEV here, let's convert
		 * it to -EPROBE_DEFER and wait for the board to decide or
		 * let Deferred Probe infrastructure handle this error.
		 */
		if (err == -ENODEV)
			err = -EPROBE_DEFER;
		kfree(cx20442);
		return err;
	}

	cx20442->tty = NULL;

	snd_soc_component_set_drvdata(component, cx20442);
	component->card->pop_time = 0;

	return 0;
}

/* power down chip */
static void cx20442_component_remove(struct snd_soc_component *component)
{
	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);

	if (cx20442->tty) {
		struct tty_struct *tty = cx20442->tty;
		tty_hangup(tty);
	}

	if (!IS_ERR(cx20442->por)) {
		/* should be already in STANDBY, hence disabled */
		regulator_put(cx20442->por);
	}

	snd_soc_component_set_drvdata(component, NULL);
	kfree(cx20442);
}

static const struct snd_soc_component_driver cx20442_component_dev = {
	.probe			= cx20442_component_probe,
	.remove			= cx20442_component_remove,
	.set_bias_level		= cx20442_set_bias_level,
	.read			= cx20442_read_reg_cache,
	.write			= cx20442_write,
	.dapm_widgets		= cx20442_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(cx20442_dapm_widgets),
	.dapm_routes		= cx20442_audio_map,
	.num_dapm_routes	= ARRAY_SIZE(cx20442_audio_map),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
	.non_legacy_dai_naming	= 1,
};

static int cx20442_platform_probe(struct platform_device *pdev)
{
	return devm_snd_soc_register_component(&pdev->dev,
			&cx20442_component_dev, &cx20442_dai, 1);
}

static struct platform_driver cx20442_platform_driver = {
	.driver = {
		.name = "cx20442-codec",
		},
	.probe = cx20442_platform_probe,
};

module_platform_driver(cx20442_platform_driver);

MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
MODULE_AUTHOR("Janusz Krzysztofik");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:cx20442-codec");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
459dc352 JK	2	/*
	3	* cx20442.c -- CX20442 ALSA Soc Audio driver
	4	*
	5	* Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
	6	*
	7	* Initially based on sound/soc/codecs/wm8400.c
	8	* Copyright 2008, 2009 Wolfson Microelectronics PLC.
	9	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
459dc352 JK	10	*/
459dc352 JK	11
ad120dae	12	#include <linux/tty.h>
5a0e3ad6	13	#include <linux/slab.h>
da155d5b	14	#include <linux/module.h>
f75a8ff6	15	#include <linux/regulator/consumer.h>
ad120dae	16
459dc352 JK	17	#include <sound/core.h>
459dc352 JK	18	#include <sound/initval.h>
ce6120cc	19	#include <sound/soc.h>
459dc352 JK	20
	21	#include "cx20442.h"
	22
	23
	24	struct cx20442_priv {
fac3f5e2	25	struct tty_struct *tty;
f75a8ff6	26	struct regulator *por;
3c89724e	27	u8 reg_cache;
459dc352 JK	28	};
	29
	30	#define CX20442_PM 0x0
	31
	32	#define CX20442_TELIN 0
	33	#define CX20442_TELOUT 1
	34	#define CX20442_MIC 2
	35	#define CX20442_SPKOUT 3
	36	#define CX20442_AGC 4
	37
	38	static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
	39	SND_SOC_DAPM_OUTPUT("TELOUT"),
	40	SND_SOC_DAPM_OUTPUT("SPKOUT"),
	41	SND_SOC_DAPM_OUTPUT("AGCOUT"),
	42
	43	SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	44
	45	SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
	46	SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
	47	SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	48
	49	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
	50	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
	51
	52	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	53
	54	SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
	55	SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
	56
	57	SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	58
	59	SND_SOC_DAPM_INPUT("TELIN"),
	60	SND_SOC_DAPM_INPUT("MIC"),
	61	SND_SOC_DAPM_INPUT("AGCIN"),
	62	};
	63
	64	static const struct snd_soc_dapm_route cx20442_audio_map[] = {
	65	{"TELOUT", NULL, "TELOUT Amp"},
	66
	67	{"SPKOUT", NULL, "SPKOUT Mixer"},
	68	{"SPKOUT Mixer", NULL, "SPKOUT Amp"},
	69
	70	{"TELOUT Amp", NULL, "DAC"},
	71	{"SPKOUT Amp", NULL, "DAC"},
	72
	73	{"SPKOUT Mixer", NULL, "SPKOUT AGC"},
	74	{"SPKOUT AGC", NULL, "AGCIN"},
	75
	76	{"AGCOUT", NULL, "MIC AGC"},
	77	{"MIC AGC", NULL, "MIC"},
	78
	79	{"MIC Bias", NULL, "MIC"},
	80	{"Input Mixer", NULL, "MIC Bias"},
	81
	82	{"TELIN Bias", NULL, "TELIN"},
	83	{"Input Mixer", NULL, "TELIN Bias"},
	84
	85	{"ADC", NULL, "Input Mixer"},
	86	};
	87
d0fdfe34	88	static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component,
3c89724e KM	89	unsigned int reg)
3c89724e KM	90	{
d0fdfe34	91	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
3c89724e KM	92
	93	if (reg >= 1)
	94	return -EINVAL;
	95
	96	return cx20442->reg_cache;
	97	}
	98
459dc352 JK	99	enum v253_vls {
	100	V253_VLS_NONE = 0,
	101	V253_VLS_T,
	102	V253_VLS_L,
	103	V253_VLS_LT,
	104	V253_VLS_S,
	105	V253_VLS_ST,
	106	V253_VLS_M,
	107	V253_VLS_MST,
	108	V253_VLS_S1,
	109	V253_VLS_S1T,
	110	V253_VLS_MS1T,
	111	V253_VLS_M1,
	112	V253_VLS_M1ST,
	113	V253_VLS_M1S1T,
	114	V253_VLS_H,
	115	V253_VLS_HT,
	116	V253_VLS_MS,
	117	V253_VLS_MS1,
	118	V253_VLS_M1S,
	119	V253_VLS_M1S1,
	120	V253_VLS_TEST,
	121	};
	122
	123	static int cx20442_pm_to_v253_vls(u8 value)
	124	{
b84eab08	125	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	126	case 0:
	127	return V253_VLS_T;
	128	case (1 << CX20442_SPKOUT):
459dc352	129	case (1 << CX20442_MIC):
459dc352 JK	130	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	131	return V253_VLS_M1S1;
	132	case (1 << CX20442_TELOUT):
	133	case (1 << CX20442_TELIN):
	134	case (1 << CX20442_TELOUT) \| (1 << CX20442_TELIN):
	135	return V253_VLS_L;
	136	case (1 << CX20442_TELOUT) \| (1 << CX20442_MIC):
	137	return V253_VLS_NONE;
	138	}
	139	return -EINVAL;
	140	}
	141	static int cx20442_pm_to_v253_vsp(u8 value)
	142	{
b84eab08	143	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	144	case (1 << CX20442_SPKOUT):
	145	case (1 << CX20442_MIC):
	146	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	147	return (bool)(value & (1 << CX20442_AGC));
	148	}
	149	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
	150	}
	151
d0fdfe34	152	static int cx20442_write(struct snd_soc_component *component, unsigned int reg,
459dc352 JK	153	unsigned int value)
459dc352 JK	154	{
d0fdfe34	155	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
459dc352 JK	156	int vls, vsp, old, len;
	157	char buf[18];
	158
3c89724e	159	if (reg >= 1)
459dc352 JK	160	return -EINVAL;
459dc352 JK	161
fac3f5e2	162	/* tty and write pointers required for talking to the modem
ad120dae	163	* are expected to be set by the line discipline initialization code */
fac3f5e2	164	if (!cx20442->tty \|\| !cx20442->tty->ops->write)
459dc352 JK	165	return -EIO;
459dc352 JK	166
3c89724e KM	167	old = cx20442->reg_cache;
3c89724e KM	168	cx20442->reg_cache = value;
459dc352 JK	169
	170	vls = cx20442_pm_to_v253_vls(value);
	171	if (vls < 0)
	172	return vls;
	173
	174	vsp = cx20442_pm_to_v253_vsp(value);
b84eab08	175	if (vsp < 0)
459dc352 JK	176	return vsp;
	177
	178	if ((vls == V253_VLS_T) \|\|
	179	(vls == cx20442_pm_to_v253_vls(old))) {
	180	if (vsp == cx20442_pm_to_v253_vsp(old))
	181	return 0;
	182	len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
	183	} else if (vsp == cx20442_pm_to_v253_vsp(old))
	184	len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
	185	else
	186	len = snprintf(buf, ARRAY_SIZE(buf),
	187	"at+vls=%d;+vsp=%d\r", vls, vsp);
	188
	189	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
	190	return -ENOMEM;
	191
d0fdfe34	192	dev_dbg(component->dev, "%s: %s\n", __func__, buf);
fac3f5e2	193	if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)
459dc352 JK	194	return -EIO;
	195
	196	return 0;
	197	}
ad120dae	198
ad120dae JK	199	/*
	200	* Line discpline related code
	201	*
	202	* Any of the callback functions below can be used in two ways:
	203	* 1) registerd by a machine driver as one of line discipline operations,
	204	* 2) called from a machine's provided line discipline callback function
	205	* in case when extra machine specific code must be run as well.
	206	*/
	207
	208	/* Modem init: echo off, digital speaker off, quiet off, voice mode */
	209	static const char *v253_init = "ate0m0q0+fclass=8\r";
	210
	211	/* Line discipline .open() */
	212	static int v253_open(struct tty_struct *tty)
	213	{
ad120dae JK	214	int ret, len = strlen(v253_init);
	215
	216	/* Doesn't make sense without write callback */
	217	if (!tty->ops->write)
	218	return -EINVAL;
	219
f0fba2ad LG	220	/* Won't work if no codec pointer has been passed by a card driver */
	221	if (!tty->disc_data)
	222	return -ENODEV;
ad120dae	223
86c0ae7c	224	tty->receive_room = 16;
ad120dae JK	225	if (tty->ops->write(tty, v253_init, len) != len) {
	226	ret = -EIO;
	227	goto err;
	228	}
	229	/* Actual setup will be performed after the modem responds. */
	230	return 0;
	231	err:
	232	tty->disc_data = NULL;
	233	return ret;
	234	}
	235
	236	/* Line discipline .close() */
	237	static void v253_close(struct tty_struct *tty)
	238	{
d0fdfe34	239	struct snd_soc_component *component = tty->disc_data;
f0fba2ad	240	struct cx20442_priv *cx20442;
ad120dae JK	241
	242	tty->disc_data = NULL;
	243
d0fdfe34	244	if (!component)
ad120dae JK	245	return;
ad120dae JK	246
d0fdfe34	247	cx20442 = snd_soc_component_get_drvdata(component);
f0fba2ad	248
ad120dae	249	/* Prevent the codec driver from further accessing the modem */
fac3f5e2	250	cx20442->tty = NULL;
d0fdfe34	251	component->card->pop_time = 0;
ad120dae JK	252	}
	253
	254	/* Line discipline .hangup() */
	255	static int v253_hangup(struct tty_struct *tty)
	256	{
	257	v253_close(tty);
	258	return 0;
	259	}
	260
	261	/* Line discipline .receive_buf() */
bb3d6bf1 LT	262	static void v253_receive(struct tty_struct *tty,
bb3d6bf1 LT	263	const unsigned char cp, char fp, int count)
ad120dae	264	{
d0fdfe34	265	struct snd_soc_component *component = tty->disc_data;
f0fba2ad	266	struct cx20442_priv *cx20442;
ad120dae	267
d0fdfe34	268	if (!component)
bb3d6bf1	269	return;
ad120dae	270
d0fdfe34	271	cx20442 = snd_soc_component_get_drvdata(component);
f0fba2ad	272
fac3f5e2	273	if (!cx20442->tty) {
ad120dae JK	274	/* First modem response, complete setup procedure */
	275
	276	/* Set up codec driver access to modem controls */
fac3f5e2	277	cx20442->tty = tty;
d0fdfe34	278	component->card->pop_time = 1;
ad120dae JK	279	}
	280	}
	281
	282	/* Line discipline .write_wakeup() */
	283	static void v253_wakeup(struct tty_struct *tty)
	284	{
	285	}
	286
	287	struct tty_ldisc_ops v253_ops = {
	288	.magic = TTY_LDISC_MAGIC,
	289	.name = "cx20442",
	290	.owner = THIS_MODULE,
	291	.open = v253_open,
	292	.close = v253_close,
	293	.hangup = v253_hangup,
	294	.receive_buf = v253_receive,
	295	.write_wakeup = v253_wakeup,
	296	};
	297	EXPORT_SYMBOL_GPL(v253_ops);
	298
	299
	300	/*
	301	* Codec DAI
	302	*/
	303
f0fba2ad	304	static struct snd_soc_dai_driver cx20442_dai = {
5394637a	305	.name = "cx20442-voice",
459dc352 JK	306	.playback = {
	307	.stream_name = "Playback",
	308	.channels_min = 1,
	309	.channels_max = 1,
	310	.rates = SNDRV_PCM_RATE_8000,
	311	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	312	},
	313	.capture = {
	314	.stream_name = "Capture",
	315	.channels_min = 1,
	316	.channels_max = 1,
	317	.rates = SNDRV_PCM_RATE_8000,
	318	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	319	},
	320	};
459dc352	321
d0fdfe34	322	static int cx20442_set_bias_level(struct snd_soc_component *component,
f75a8ff6 JK	323	enum snd_soc_bias_level level)
f75a8ff6 JK	324	{
d0fdfe34	325	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
f75a8ff6 JK	326	int err = 0;
	327
	328	switch (level) {
	329	case SND_SOC_BIAS_PREPARE:
d0fdfe34	330	if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY)
f75a8ff6 JK	331	break;
	332	if (IS_ERR(cx20442->por))
	333	err = PTR_ERR(cx20442->por);
	334	else
	335	err = regulator_enable(cx20442->por);
	336	break;
	337	case SND_SOC_BIAS_STANDBY:
d0fdfe34	338	if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE)
f75a8ff6 JK	339	break;
	340	if (IS_ERR(cx20442->por))
	341	err = PTR_ERR(cx20442->por);
	342	else
	343	err = regulator_disable(cx20442->por);
	344	break;
	345	default:
	346	break;
	347	}
f75a8ff6 JK	348
	349	return err;
	350	}
	351
d0fdfe34	352	static int cx20442_component_probe(struct snd_soc_component *component)
459dc352	353	{
f0fba2ad	354	struct cx20442_priv *cx20442;
459dc352	355
f0fba2ad LG	356	cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
	357	if (cx20442 == NULL)
	358	return -ENOMEM;
459dc352	359
d0fdfe34	360	cx20442->por = regulator_get(component->dev, "POR");
50c67877 JK	361	if (IS_ERR(cx20442->por)) {
	362	int err = PTR_ERR(cx20442->por);
	363
	364	dev_warn(component->dev, "failed to get POR supply (%d)", err);
	365	/*
	366	* When running on a non-dt platform and requested regulator
	367	* is not available, regulator_get() never returns
	368	* -EPROBE_DEFER as it is not able to justify if the regulator
	369	* may still appear later. On the other hand, the board can
	370	* still set full constraints flag at late_initcall in order
	371	* to instruct regulator_get() to return a dummy one if
	372	* sufficient. Hence, if we get -ENODEV here, let's convert
	373	* it to -EPROBE_DEFER and wait for the board to decide or
	374	* let Deferred Probe infrastructure handle this error.
	375	*/
	376	if (err == -ENODEV)
	377	err = -EPROBE_DEFER;
	378	kfree(cx20442);
	379	return err;
	380	}
	381
fac3f5e2	382	cx20442->tty = NULL;
f75a8ff6	383
d0fdfe34 KM	384	snd_soc_component_set_drvdata(component, cx20442);
d0fdfe34 KM	385	component->card->pop_time = 0;
f0fba2ad LG	386
f0fba2ad LG	387	return 0;
459dc352 JK	388	}
	389
	390	/* power down chip */
d0fdfe34	391	static void cx20442_component_remove(struct snd_soc_component *component)
459dc352	392	{
d0fdfe34	393	struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
459dc352	394
fac3f5e2 KM	395	if (cx20442->tty) {
fac3f5e2 KM	396	struct tty_struct *tty = cx20442->tty;
aaed2a62	397	tty_hangup(tty);
f0fba2ad	398	}
459dc352	399
f75a8ff6 JK	400	if (!IS_ERR(cx20442->por)) {
	401	/* should be already in STANDBY, hence disabled */
	402	regulator_put(cx20442->por);
	403	}
	404
d0fdfe34	405	snd_soc_component_set_drvdata(component, NULL);
f0fba2ad	406	kfree(cx20442);
459dc352 JK	407	}
459dc352 JK	408
d0fdfe34 KM	409	static const struct snd_soc_component_driver cx20442_component_dev = {
	410	.probe = cx20442_component_probe,
	411	.remove = cx20442_component_remove,
	412	.set_bias_level = cx20442_set_bias_level,
	413	.read = cx20442_read_reg_cache,
	414	.write = cx20442_write,
	415	.dapm_widgets = cx20442_dapm_widgets,
	416	.num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
	417	.dapm_routes = cx20442_audio_map,
	418	.num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
	419	.idle_bias_on = 1,
	420	.use_pmdown_time = 1,
	421	.endianness = 1,
	422	.non_legacy_dai_naming = 1,
459dc352	423	};
459dc352 JK	424
	425	static int cx20442_platform_probe(struct platform_device *pdev)
	426	{
d0fdfe34 KM	427	return devm_snd_soc_register_component(&pdev->dev,
d0fdfe34 KM	428	&cx20442_component_dev, &cx20442_dai, 1);
459dc352 JK	429	}
	430
	431	static struct platform_driver cx20442_platform_driver = {
	432	.driver = {
f0fba2ad	433	.name = "cx20442-codec",
459dc352 JK	434	},
459dc352 JK	435	.probe = cx20442_platform_probe,
459dc352 JK	436	};
459dc352 JK	437
5bbcc3c0	438	module_platform_driver(cx20442_platform_driver);
459dc352 JK	439
	440	MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
	441	MODULE_AUTHOR("Janusz Krzysztofik");
	442	MODULE_LICENSE("GPL");
f0fba2ad	443	MODULE_ALIAS("platform:cx20442-codec");