[deliverable/linux.git] / sound / soc / codecs / cx20442.c

/*
 * 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>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#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 {
	void *control_data;
	struct regulator *por;
};

#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_codec *codec,
							unsigned int reg)
{
	u8 *reg_cache = codec->reg_cache;

	if (reg >= codec->driver->reg_cache_size)
		return -EINVAL;

	return reg_cache[reg];
}

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_codec *codec, unsigned int reg,
							unsigned int value)
{
	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
	u8 *reg_cache = codec->reg_cache;
	int vls, vsp, old, len;
	char buf[18];

	if (reg >= codec->driver->reg_cache_size)
		return -EINVAL;

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

	old = reg_cache[reg];
	reg_cache[reg] = 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(codec->dev, "%s: %s\n", __func__, buf);
	if (codec->hw_write(cx20442->control_data, 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;

	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_codec *codec = tty->disc_data;
	struct cx20442_priv *cx20442;

	tty->disc_data = NULL;

	if (!codec)
		return;

	cx20442 = snd_soc_codec_get_drvdata(codec);

	/* Prevent the codec driver from further accessing the modem */
	codec->hw_write = NULL;
	cx20442->control_data = NULL;
	codec->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_codec *codec = tty->disc_data;
	struct cx20442_priv *cx20442;

	if (!codec)
		return;

	cx20442 = snd_soc_codec_get_drvdata(codec);

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

		/* Set up codec driver access to modem controls */
		cx20442->control_data = tty;
		codec->hw_write = (hw_write_t)tty->ops->write;
		codec->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_codec *codec,
		enum snd_soc_bias_level level)
{
	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
	int err = 0;

	switch (level) {
	case SND_SOC_BIAS_PREPARE:
		if (snd_soc_codec_get_bias_level(codec) != 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_codec_get_bias_level(codec) != 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_codec_probe(struct snd_soc_codec *codec)
{
	struct cx20442_priv *cx20442;

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

	cx20442->por = regulator_get(codec->dev, "POR");
	if (IS_ERR(cx20442->por))
		dev_warn(codec->dev, "failed to get the regulator");
	cx20442->control_data = NULL;

	snd_soc_codec_set_drvdata(codec, cx20442);
	codec->hw_write = NULL;
	codec->component.card->pop_time = 0;

	return 0;
}

/* power down chip */
static int cx20442_codec_remove(struct snd_soc_codec *codec)
{
	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);

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

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

	snd_soc_codec_set_drvdata(codec, NULL);
	kfree(cx20442);
	return 0;
}

static const u8 cx20442_reg;

static struct snd_soc_codec_driver cx20442_codec_dev = {
	.probe = 	cx20442_codec_probe,
	.remove = 	cx20442_codec_remove,
	.set_bias_level = cx20442_set_bias_level,
	.reg_cache_default = &cx20442_reg,
	.reg_cache_size = 1,
	.reg_word_size = sizeof(u8),
	.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),
};

static int cx20442_platform_probe(struct platform_device *pdev)
{
	return snd_soc_register_codec(&pdev->dev,
			&cx20442_codec_dev, &cx20442_dai, 1);
}

static int cx20442_platform_remove(struct platform_device *pdev)
{
	snd_soc_unregister_codec(&pdev->dev);
	return 0;
}

static struct platform_driver cx20442_platform_driver = {
	.driver = {
		.name = "cx20442-codec",
		},
	.probe = cx20442_platform_probe,
	.remove = cx20442_platform_remove,
};

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
459dc352 JK	1	/*
	2	* cx20442.c -- CX20442 ALSA Soc Audio driver
	3	*
	4	* Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
	5	*
	6	* Initially based on sound/soc/codecs/wm8400.c
	7	* Copyright 2008, 2009 Wolfson Microelectronics PLC.
	8	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*/
	15
ad120dae	16	#include <linux/tty.h>
5a0e3ad6	17	#include <linux/slab.h>
da155d5b	18	#include <linux/module.h>
f75a8ff6	19	#include <linux/regulator/consumer.h>
ad120dae	20
459dc352 JK	21	#include <sound/core.h>
459dc352 JK	22	#include <sound/initval.h>
ce6120cc	23	#include <sound/soc.h>
459dc352 JK	24
	25	#include "cx20442.h"
	26
	27
	28	struct cx20442_priv {
f0fba2ad	29	void *control_data;
f75a8ff6	30	struct regulator *por;
459dc352 JK	31	};
	32
	33	#define CX20442_PM 0x0
	34
	35	#define CX20442_TELIN 0
	36	#define CX20442_TELOUT 1
	37	#define CX20442_MIC 2
	38	#define CX20442_SPKOUT 3
	39	#define CX20442_AGC 4
	40
	41	static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
	42	SND_SOC_DAPM_OUTPUT("TELOUT"),
	43	SND_SOC_DAPM_OUTPUT("SPKOUT"),
	44	SND_SOC_DAPM_OUTPUT("AGCOUT"),
	45
	46	SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	47
	48	SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
	49	SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
	50	SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	51
	52	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
	53	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
	54
	55	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	56
	57	SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
	58	SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
	59
	60	SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	61
	62	SND_SOC_DAPM_INPUT("TELIN"),
	63	SND_SOC_DAPM_INPUT("MIC"),
	64	SND_SOC_DAPM_INPUT("AGCIN"),
	65	};
	66
	67	static const struct snd_soc_dapm_route cx20442_audio_map[] = {
	68	{"TELOUT", NULL, "TELOUT Amp"},
	69
	70	{"SPKOUT", NULL, "SPKOUT Mixer"},
	71	{"SPKOUT Mixer", NULL, "SPKOUT Amp"},
	72
	73	{"TELOUT Amp", NULL, "DAC"},
	74	{"SPKOUT Amp", NULL, "DAC"},
	75
	76	{"SPKOUT Mixer", NULL, "SPKOUT AGC"},
	77	{"SPKOUT AGC", NULL, "AGCIN"},
	78
	79	{"AGCOUT", NULL, "MIC AGC"},
	80	{"MIC AGC", NULL, "MIC"},
	81
	82	{"MIC Bias", NULL, "MIC"},
	83	{"Input Mixer", NULL, "MIC Bias"},
	84
	85	{"TELIN Bias", NULL, "TELIN"},
	86	{"Input Mixer", NULL, "TELIN Bias"},
	87
	88	{"ADC", NULL, "Input Mixer"},
	89	};
	90
459dc352 JK	91	static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
	92	unsigned int reg)
	93	{
	94	u8 *reg_cache = codec->reg_cache;
	95
f0fba2ad	96	if (reg >= codec->driver->reg_cache_size)
459dc352 JK	97	return -EINVAL;
	98
	99	return reg_cache[reg];
	100	}
	101
	102	enum v253_vls {
	103	V253_VLS_NONE = 0,
	104	V253_VLS_T,
	105	V253_VLS_L,
	106	V253_VLS_LT,
	107	V253_VLS_S,
	108	V253_VLS_ST,
	109	V253_VLS_M,
	110	V253_VLS_MST,
	111	V253_VLS_S1,
	112	V253_VLS_S1T,
	113	V253_VLS_MS1T,
	114	V253_VLS_M1,
	115	V253_VLS_M1ST,
	116	V253_VLS_M1S1T,
	117	V253_VLS_H,
	118	V253_VLS_HT,
	119	V253_VLS_MS,
	120	V253_VLS_MS1,
	121	V253_VLS_M1S,
	122	V253_VLS_M1S1,
	123	V253_VLS_TEST,
	124	};
	125
	126	static int cx20442_pm_to_v253_vls(u8 value)
	127	{
b84eab08	128	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	129	case 0:
	130	return V253_VLS_T;
	131	case (1 << CX20442_SPKOUT):
459dc352	132	case (1 << CX20442_MIC):
459dc352 JK	133	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	134	return V253_VLS_M1S1;
	135	case (1 << CX20442_TELOUT):
	136	case (1 << CX20442_TELIN):
	137	case (1 << CX20442_TELOUT) \| (1 << CX20442_TELIN):
	138	return V253_VLS_L;
	139	case (1 << CX20442_TELOUT) \| (1 << CX20442_MIC):
	140	return V253_VLS_NONE;
	141	}
	142	return -EINVAL;
	143	}
	144	static int cx20442_pm_to_v253_vsp(u8 value)
	145	{
b84eab08	146	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	147	case (1 << CX20442_SPKOUT):
	148	case (1 << CX20442_MIC):
	149	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	150	return (bool)(value & (1 << CX20442_AGC));
	151	}
	152	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
	153	}
	154
	155	static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
	156	unsigned int value)
	157	{
f0fba2ad	158	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
459dc352 JK	159	u8 *reg_cache = codec->reg_cache;
	160	int vls, vsp, old, len;
	161	char buf[18];
	162
f0fba2ad	163	if (reg >= codec->driver->reg_cache_size)
459dc352 JK	164	return -EINVAL;
459dc352 JK	165
b84eab08	166	/* hw_write and control_data pointers required for talking to the modem
ad120dae	167	* are expected to be set by the line discipline initialization code */
f0fba2ad	168	if (!codec->hw_write \|\| !cx20442->control_data)
459dc352 JK	169	return -EIO;
	170
	171	old = reg_cache[reg];
	172	reg_cache[reg] = value;
	173
	174	vls = cx20442_pm_to_v253_vls(value);
	175	if (vls < 0)
	176	return vls;
	177
	178	vsp = cx20442_pm_to_v253_vsp(value);
b84eab08	179	if (vsp < 0)
459dc352 JK	180	return vsp;
	181
	182	if ((vls == V253_VLS_T) \|\|
	183	(vls == cx20442_pm_to_v253_vls(old))) {
	184	if (vsp == cx20442_pm_to_v253_vsp(old))
	185	return 0;
	186	len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
	187	} else if (vsp == cx20442_pm_to_v253_vsp(old))
	188	len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
	189	else
	190	len = snprintf(buf, ARRAY_SIZE(buf),
	191	"at+vls=%d;+vsp=%d\r", vls, vsp);
	192
	193	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
	194	return -ENOMEM;
	195
4977b03e	196	dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
f0fba2ad	197	if (codec->hw_write(cx20442->control_data, buf, len) != len)
459dc352 JK	198	return -EIO;
	199
	200	return 0;
	201	}
	202
ad120dae	203
ad120dae JK	204	/*
	205	* Line discpline related code
	206	*
	207	* Any of the callback functions below can be used in two ways:
	208	* 1) registerd by a machine driver as one of line discipline operations,
	209	* 2) called from a machine's provided line discipline callback function
	210	* in case when extra machine specific code must be run as well.
	211	*/
	212
	213	/* Modem init: echo off, digital speaker off, quiet off, voice mode */
	214	static const char *v253_init = "ate0m0q0+fclass=8\r";
	215
	216	/* Line discipline .open() */
	217	static int v253_open(struct tty_struct *tty)
	218	{
ad120dae JK	219	int ret, len = strlen(v253_init);
	220
	221	/* Doesn't make sense without write callback */
	222	if (!tty->ops->write)
	223	return -EINVAL;
	224
f0fba2ad LG	225	/* Won't work if no codec pointer has been passed by a card driver */
	226	if (!tty->disc_data)
	227	return -ENODEV;
ad120dae JK	228
	229	if (tty->ops->write(tty, v253_init, len) != len) {
	230	ret = -EIO;
	231	goto err;
	232	}
	233	/* Actual setup will be performed after the modem responds. */
	234	return 0;
	235	err:
	236	tty->disc_data = NULL;
	237	return ret;
	238	}
	239
	240	/* Line discipline .close() */
	241	static void v253_close(struct tty_struct *tty)
	242	{
	243	struct snd_soc_codec *codec = tty->disc_data;
f0fba2ad	244	struct cx20442_priv *cx20442;
ad120dae JK	245
	246	tty->disc_data = NULL;
	247
	248	if (!codec)
	249	return;
	250
f0fba2ad LG	251	cx20442 = snd_soc_codec_get_drvdata(codec);
f0fba2ad LG	252
ad120dae JK	253	/* Prevent the codec driver from further accessing the modem */
ad120dae JK	254	codec->hw_write = NULL;
f0fba2ad	255	cx20442->control_data = NULL;
00200107	256	codec->component.card->pop_time = 0;
ad120dae JK	257	}
	258
	259	/* Line discipline .hangup() */
	260	static int v253_hangup(struct tty_struct *tty)
	261	{
	262	v253_close(tty);
	263	return 0;
	264	}
	265
	266	/* Line discipline .receive_buf() */
bb3d6bf1 LT	267	static void v253_receive(struct tty_struct *tty,
bb3d6bf1 LT	268	const unsigned char cp, char fp, int count)
ad120dae JK	269	{
ad120dae JK	270	struct snd_soc_codec *codec = tty->disc_data;
f0fba2ad	271	struct cx20442_priv *cx20442;
ad120dae JK	272
ad120dae JK	273	if (!codec)
bb3d6bf1	274	return;
ad120dae	275
f0fba2ad LG	276	cx20442 = snd_soc_codec_get_drvdata(codec);
	277
	278	if (!cx20442->control_data) {
ad120dae JK	279	/* First modem response, complete setup procedure */
	280
	281	/* Set up codec driver access to modem controls */
f0fba2ad	282	cx20442->control_data = tty;
ad120dae	283	codec->hw_write = (hw_write_t)tty->ops->write;
00200107	284	codec->component.card->pop_time = 1;
ad120dae JK	285	}
	286	}
	287
	288	/* Line discipline .write_wakeup() */
	289	static void v253_wakeup(struct tty_struct *tty)
	290	{
	291	}
	292
	293	struct tty_ldisc_ops v253_ops = {
	294	.magic = TTY_LDISC_MAGIC,
	295	.name = "cx20442",
	296	.owner = THIS_MODULE,
	297	.open = v253_open,
	298	.close = v253_close,
	299	.hangup = v253_hangup,
	300	.receive_buf = v253_receive,
	301	.write_wakeup = v253_wakeup,
	302	};
	303	EXPORT_SYMBOL_GPL(v253_ops);
	304
	305
	306	/*
	307	* Codec DAI
	308	*/
	309
f0fba2ad	310	static struct snd_soc_dai_driver cx20442_dai = {
5394637a	311	.name = "cx20442-voice",
459dc352 JK	312	.playback = {
	313	.stream_name = "Playback",
	314	.channels_min = 1,
	315	.channels_max = 1,
	316	.rates = SNDRV_PCM_RATE_8000,
	317	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	318	},
	319	.capture = {
	320	.stream_name = "Capture",
	321	.channels_min = 1,
	322	.channels_max = 1,
	323	.rates = SNDRV_PCM_RATE_8000,
	324	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	325	},
	326	};
459dc352	327
f75a8ff6 JK	328	static int cx20442_set_bias_level(struct snd_soc_codec *codec,
	329	enum snd_soc_bias_level level)
	330	{
	331	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
	332	int err = 0;
	333
	334	switch (level) {
	335	case SND_SOC_BIAS_PREPARE:
3f36f3c7	336	if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_STANDBY)
f75a8ff6 JK	337	break;
	338	if (IS_ERR(cx20442->por))
	339	err = PTR_ERR(cx20442->por);
	340	else
	341	err = regulator_enable(cx20442->por);
	342	break;
	343	case SND_SOC_BIAS_STANDBY:
3f36f3c7	344	if (snd_soc_codec_get_bias_level(codec) != SND_SOC_BIAS_PREPARE)
f75a8ff6 JK	345	break;
	346	if (IS_ERR(cx20442->por))
	347	err = PTR_ERR(cx20442->por);
	348	else
	349	err = regulator_disable(cx20442->por);
	350	break;
	351	default:
	352	break;
	353	}
f75a8ff6 JK	354
	355	return err;
	356	}
	357
f0fba2ad	358	static int cx20442_codec_probe(struct snd_soc_codec *codec)
459dc352	359	{
f0fba2ad	360	struct cx20442_priv *cx20442;
459dc352	361
f0fba2ad LG	362	cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
	363	if (cx20442 == NULL)
	364	return -ENOMEM;
459dc352	365
f75a8ff6 JK	366	cx20442->por = regulator_get(codec->dev, "POR");
	367	if (IS_ERR(cx20442->por))
	368	dev_warn(codec->dev, "failed to get the regulator");
f0fba2ad	369	cx20442->control_data = NULL;
f75a8ff6 JK	370
f75a8ff6 JK	371	snd_soc_codec_set_drvdata(codec, cx20442);
f0fba2ad	372	codec->hw_write = NULL;
00200107	373	codec->component.card->pop_time = 0;
f0fba2ad LG	374
f0fba2ad LG	375	return 0;
459dc352 JK	376	}
	377
	378	/* power down chip */
f0fba2ad	379	static int cx20442_codec_remove(struct snd_soc_codec *codec)
459dc352	380	{
f0fba2ad	381	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
459dc352	382
f0fba2ad	383	if (cx20442->control_data) {
aaed2a62 MB	384	struct tty_struct *tty = cx20442->control_data;
aaed2a62 MB	385	tty_hangup(tty);
f0fba2ad	386	}
459dc352	387
f75a8ff6 JK	388	if (!IS_ERR(cx20442->por)) {
	389	/* should be already in STANDBY, hence disabled */
	390	regulator_put(cx20442->por);
	391	}
	392
	393	snd_soc_codec_set_drvdata(codec, NULL);
f0fba2ad	394	kfree(cx20442);
459dc352 JK	395	return 0;
	396	}
	397
8e6bfb9b	398	static const u8 cx20442_reg;
f019ee5f	399
f0fba2ad	400	static struct snd_soc_codec_driver cx20442_codec_dev = {
459dc352 JK	401	.probe = cx20442_codec_probe,
459dc352 JK	402	.remove = cx20442_codec_remove,
f75a8ff6	403	.set_bias_level = cx20442_set_bias_level,
f019ee5f	404	.reg_cache_default = &cx20442_reg,
f0fba2ad LG	405	.reg_cache_size = 1,
	406	.reg_word_size = sizeof(u8),
	407	.read = cx20442_read_reg_cache,
	408	.write = cx20442_write,
51fb1a87 LG	409	.dapm_widgets = cx20442_dapm_widgets,
	410	.num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
	411	.dapm_routes = cx20442_audio_map,
	412	.num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
459dc352	413	};
459dc352 JK	414
	415	static int cx20442_platform_probe(struct platform_device *pdev)
	416	{
f0fba2ad LG	417	return snd_soc_register_codec(&pdev->dev,
f0fba2ad LG	418	&cx20442_codec_dev, &cx20442_dai, 1);
459dc352 JK	419	}
459dc352 JK	420
32556394	421	static int cx20442_platform_remove(struct platform_device *pdev)
459dc352	422	{
f0fba2ad	423	snd_soc_unregister_codec(&pdev->dev);
459dc352 JK	424	return 0;
	425	}
	426
	427	static struct platform_driver cx20442_platform_driver = {
	428	.driver = {
f0fba2ad	429	.name = "cx20442-codec",
459dc352 JK	430	},
459dc352 JK	431	.probe = cx20442_platform_probe,
32556394	432	.remove = cx20442_platform_remove,
459dc352 JK	433	};
459dc352 JK	434
5bbcc3c0	435	module_platform_driver(cx20442_platform_driver);
459dc352 JK	436
	437	MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
	438	MODULE_AUTHOR("Janusz Krzysztofik");
	439	MODULE_LICENSE("GPL");
f0fba2ad	440	MODULE_ALIAS("platform:cx20442-codec");