[GitHub/mt8127/android_kernel_alcatel_ttab.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 <sound/core.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "cx20442.h"


struct cx20442_priv {
	enum snd_soc_control_type control_type;
	void *control_data;
	u8 reg_cache[1];
};

#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 int cx20442_add_widgets(struct snd_soc_codec *codec)
{
	struct snd_soc_dapm_context *dapm = &codec->dapm;

	snd_soc_dapm_new_controls(dapm, cx20442_dapm_widgets,
				  ARRAY_SIZE(cx20442_dapm_widgets));
	snd_soc_dapm_add_routes(dapm, cx20442_audio_map,
				ARRAY_SIZE(cx20442_audio_map));

	return 0;
}

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->dapm.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->dapm.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_codec_probe(struct snd_soc_codec *codec)
{
	struct cx20442_priv *cx20442;

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

	cx20442_add_widgets(codec);

	cx20442->control_data = NULL;
	codec->hw_write = NULL;
	codec->dapm.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);
	}

	kfree(cx20442);
	return 0;
}

static struct snd_soc_codec_driver cx20442_codec_dev = {
	.probe = 	cx20442_codec_probe,
	.remove = 	cx20442_codec_remove,
	.reg_cache_size = 1,
	.reg_word_size = sizeof(u8),
	.read = cx20442_read_reg_cache,
	.write = cx20442_write,
};

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

static int __exit 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",
		.owner = THIS_MODULE,
		},
	.probe = cx20442_platform_probe,
	.remove = __exit_p(cx20442_platform_remove),
};

static int __init cx20442_init(void)
{
	return platform_driver_register(&cx20442_platform_driver);
}
module_init(cx20442_init);

static void __exit cx20442_exit(void)
{
	platform_driver_unregister(&cx20442_platform_driver);
}
module_exit(cx20442_exit);

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>
ad120dae	18
459dc352 JK	19	#include <sound/core.h>
459dc352 JK	20	#include <sound/initval.h>
ce6120cc	21	#include <sound/soc.h>
459dc352 JK	22
	23	#include "cx20442.h"
	24
	25
	26	struct cx20442_priv {
f0fba2ad LG	27	enum snd_soc_control_type control_type;
f0fba2ad LG	28	void *control_data;
459dc352 JK	29	u8 reg_cache[1];
	30	};
	31
	32	#define CX20442_PM 0x0
	33
	34	#define CX20442_TELIN 0
	35	#define CX20442_TELOUT 1
	36	#define CX20442_MIC 2
	37	#define CX20442_SPKOUT 3
	38	#define CX20442_AGC 4
	39
	40	static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
	41	SND_SOC_DAPM_OUTPUT("TELOUT"),
	42	SND_SOC_DAPM_OUTPUT("SPKOUT"),
	43	SND_SOC_DAPM_OUTPUT("AGCOUT"),
	44
	45	SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	46
	47	SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
	48	SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
	49	SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	50
	51	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
	52	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
	53
	54	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	55
	56	SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
	57	SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
	58
	59	SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	60
	61	SND_SOC_DAPM_INPUT("TELIN"),
	62	SND_SOC_DAPM_INPUT("MIC"),
	63	SND_SOC_DAPM_INPUT("AGCIN"),
	64	};
	65
	66	static const struct snd_soc_dapm_route cx20442_audio_map[] = {
	67	{"TELOUT", NULL, "TELOUT Amp"},
	68
	69	{"SPKOUT", NULL, "SPKOUT Mixer"},
	70	{"SPKOUT Mixer", NULL, "SPKOUT Amp"},
	71
	72	{"TELOUT Amp", NULL, "DAC"},
	73	{"SPKOUT Amp", NULL, "DAC"},
	74
	75	{"SPKOUT Mixer", NULL, "SPKOUT AGC"},
	76	{"SPKOUT AGC", NULL, "AGCIN"},
	77
	78	{"AGCOUT", NULL, "MIC AGC"},
	79	{"MIC AGC", NULL, "MIC"},
	80
	81	{"MIC Bias", NULL, "MIC"},
	82	{"Input Mixer", NULL, "MIC Bias"},
	83
	84	{"TELIN Bias", NULL, "TELIN"},
	85	{"Input Mixer", NULL, "TELIN Bias"},
	86
	87	{"ADC", NULL, "Input Mixer"},
	88	};
	89
	90	static int cx20442_add_widgets(struct snd_soc_codec *codec)
	91	{
ce6120cc	92	struct snd_soc_dapm_context *dapm = &codec->dapm;
459dc352	93
ce6120cc LG	94	snd_soc_dapm_new_controls(dapm, cx20442_dapm_widgets,
	95	ARRAY_SIZE(cx20442_dapm_widgets));
	96	snd_soc_dapm_add_routes(dapm, cx20442_audio_map,
459dc352 JK	97	ARRAY_SIZE(cx20442_audio_map));
459dc352 JK	98
459dc352 JK	99	return 0;
	100	}
	101
	102	static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
	103	unsigned int reg)
	104	{
	105	u8 *reg_cache = codec->reg_cache;
	106
f0fba2ad	107	if (reg >= codec->driver->reg_cache_size)
459dc352 JK	108	return -EINVAL;
	109
	110	return reg_cache[reg];
	111	}
	112
	113	enum v253_vls {
	114	V253_VLS_NONE = 0,
	115	V253_VLS_T,
	116	V253_VLS_L,
	117	V253_VLS_LT,
	118	V253_VLS_S,
	119	V253_VLS_ST,
	120	V253_VLS_M,
	121	V253_VLS_MST,
	122	V253_VLS_S1,
	123	V253_VLS_S1T,
	124	V253_VLS_MS1T,
	125	V253_VLS_M1,
	126	V253_VLS_M1ST,
	127	V253_VLS_M1S1T,
	128	V253_VLS_H,
	129	V253_VLS_HT,
	130	V253_VLS_MS,
	131	V253_VLS_MS1,
	132	V253_VLS_M1S,
	133	V253_VLS_M1S1,
	134	V253_VLS_TEST,
	135	};
	136
	137	static int cx20442_pm_to_v253_vls(u8 value)
	138	{
b84eab08	139	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	140	case 0:
	141	return V253_VLS_T;
	142	case (1 << CX20442_SPKOUT):
459dc352	143	case (1 << CX20442_MIC):
459dc352 JK	144	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	145	return V253_VLS_M1S1;
	146	case (1 << CX20442_TELOUT):
	147	case (1 << CX20442_TELIN):
	148	case (1 << CX20442_TELOUT) \| (1 << CX20442_TELIN):
	149	return V253_VLS_L;
	150	case (1 << CX20442_TELOUT) \| (1 << CX20442_MIC):
	151	return V253_VLS_NONE;
	152	}
	153	return -EINVAL;
	154	}
	155	static int cx20442_pm_to_v253_vsp(u8 value)
	156	{
b84eab08	157	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	158	case (1 << CX20442_SPKOUT):
	159	case (1 << CX20442_MIC):
	160	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	161	return (bool)(value & (1 << CX20442_AGC));
	162	}
	163	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
	164	}
	165
	166	static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
	167	unsigned int value)
	168	{
f0fba2ad	169	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
459dc352 JK	170	u8 *reg_cache = codec->reg_cache;
	171	int vls, vsp, old, len;
	172	char buf[18];
	173
f0fba2ad	174	if (reg >= codec->driver->reg_cache_size)
459dc352 JK	175	return -EINVAL;
459dc352 JK	176
b84eab08	177	/* hw_write and control_data pointers required for talking to the modem
ad120dae	178	* are expected to be set by the line discipline initialization code */
f0fba2ad	179	if (!codec->hw_write \|\| !cx20442->control_data)
459dc352 JK	180	return -EIO;
	181
	182	old = reg_cache[reg];
	183	reg_cache[reg] = value;
	184
	185	vls = cx20442_pm_to_v253_vls(value);
	186	if (vls < 0)
	187	return vls;
	188
	189	vsp = cx20442_pm_to_v253_vsp(value);
b84eab08	190	if (vsp < 0)
459dc352 JK	191	return vsp;
	192
	193	if ((vls == V253_VLS_T) \|\|
	194	(vls == cx20442_pm_to_v253_vls(old))) {
	195	if (vsp == cx20442_pm_to_v253_vsp(old))
	196	return 0;
	197	len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
	198	} else if (vsp == cx20442_pm_to_v253_vsp(old))
	199	len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
	200	else
	201	len = snprintf(buf, ARRAY_SIZE(buf),
	202	"at+vls=%d;+vsp=%d\r", vls, vsp);
	203
	204	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
	205	return -ENOMEM;
	206
4977b03e	207	dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
f0fba2ad	208	if (codec->hw_write(cx20442->control_data, buf, len) != len)
459dc352 JK	209	return -EIO;
	210
	211	return 0;
	212	}
	213
ad120dae	214
ad120dae JK	215	/*
	216	* Line discpline related code
	217	*
	218	* Any of the callback functions below can be used in two ways:
	219	* 1) registerd by a machine driver as one of line discipline operations,
	220	* 2) called from a machine's provided line discipline callback function
	221	* in case when extra machine specific code must be run as well.
	222	*/
	223
	224	/* Modem init: echo off, digital speaker off, quiet off, voice mode */
	225	static const char *v253_init = "ate0m0q0+fclass=8\r";
	226
	227	/* Line discipline .open() */
	228	static int v253_open(struct tty_struct *tty)
	229	{
ad120dae JK	230	int ret, len = strlen(v253_init);
	231
	232	/* Doesn't make sense without write callback */
	233	if (!tty->ops->write)
	234	return -EINVAL;
	235
f0fba2ad LG	236	/* Won't work if no codec pointer has been passed by a card driver */
	237	if (!tty->disc_data)
	238	return -ENODEV;
ad120dae JK	239
	240	if (tty->ops->write(tty, v253_init, len) != len) {
	241	ret = -EIO;
	242	goto err;
	243	}
	244	/* Actual setup will be performed after the modem responds. */
	245	return 0;
	246	err:
	247	tty->disc_data = NULL;
	248	return ret;
	249	}
	250
	251	/* Line discipline .close() */
	252	static void v253_close(struct tty_struct *tty)
	253	{
	254	struct snd_soc_codec *codec = tty->disc_data;
f0fba2ad	255	struct cx20442_priv *cx20442;
ad120dae JK	256
	257	tty->disc_data = NULL;
	258
	259	if (!codec)
	260	return;
	261
f0fba2ad LG	262	cx20442 = snd_soc_codec_get_drvdata(codec);
f0fba2ad LG	263
ad120dae JK	264	/* Prevent the codec driver from further accessing the modem */
ad120dae JK	265	codec->hw_write = NULL;
f0fba2ad	266	cx20442->control_data = NULL;
ce6120cc	267	codec->dapm.pop_time = 0;
ad120dae JK	268	}
	269
	270	/* Line discipline .hangup() */
	271	static int v253_hangup(struct tty_struct *tty)
	272	{
	273	v253_close(tty);
	274	return 0;
	275	}
	276
	277	/* Line discipline .receive_buf() */
	278	static void v253_receive(struct tty_struct *tty,
	279	const unsigned char cp, char fp, int count)
	280	{
	281	struct snd_soc_codec *codec = tty->disc_data;
f0fba2ad	282	struct cx20442_priv *cx20442;
ad120dae JK	283
	284	if (!codec)
	285	return;
	286
f0fba2ad LG	287	cx20442 = snd_soc_codec_get_drvdata(codec);
	288
	289	if (!cx20442->control_data) {
ad120dae JK	290	/* First modem response, complete setup procedure */
	291
	292	/* Set up codec driver access to modem controls */
f0fba2ad	293	cx20442->control_data = tty;
ad120dae	294	codec->hw_write = (hw_write_t)tty->ops->write;
ce6120cc	295	codec->dapm.pop_time = 1;
ad120dae JK	296	}
	297	}
	298
	299	/* Line discipline .write_wakeup() */
	300	static void v253_wakeup(struct tty_struct *tty)
	301	{
	302	}
	303
	304	struct tty_ldisc_ops v253_ops = {
	305	.magic = TTY_LDISC_MAGIC,
	306	.name = "cx20442",
	307	.owner = THIS_MODULE,
	308	.open = v253_open,
	309	.close = v253_close,
	310	.hangup = v253_hangup,
	311	.receive_buf = v253_receive,
	312	.write_wakeup = v253_wakeup,
	313	};
	314	EXPORT_SYMBOL_GPL(v253_ops);
	315
	316
	317	/*
	318	* Codec DAI
	319	*/
	320
f0fba2ad	321	static struct snd_soc_dai_driver cx20442_dai = {
5394637a	322	.name = "cx20442-voice",
459dc352 JK	323	.playback = {
	324	.stream_name = "Playback",
	325	.channels_min = 1,
	326	.channels_max = 1,
	327	.rates = SNDRV_PCM_RATE_8000,
	328	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	329	},
	330	.capture = {
	331	.stream_name = "Capture",
	332	.channels_min = 1,
	333	.channels_max = 1,
	334	.rates = SNDRV_PCM_RATE_8000,
	335	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	336	},
	337	};
459dc352	338
f0fba2ad	339	static int cx20442_codec_probe(struct snd_soc_codec *codec)
459dc352	340	{
f0fba2ad	341	struct cx20442_priv *cx20442;
459dc352	342
f0fba2ad LG	343	cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
	344	if (cx20442 == NULL)
	345	return -ENOMEM;
	346	snd_soc_codec_set_drvdata(codec, cx20442);
459dc352 JK	347
	348	cx20442_add_widgets(codec);
	349
f0fba2ad LG	350	cx20442->control_data = NULL;
f0fba2ad LG	351	codec->hw_write = NULL;
ce6120cc	352	codec->dapm.pop_time = 0;
f0fba2ad LG	353
f0fba2ad LG	354	return 0;
459dc352 JK	355	}
	356
	357	/* power down chip */
f0fba2ad	358	static int cx20442_codec_remove(struct snd_soc_codec *codec)
459dc352	359	{
f0fba2ad	360	struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec);
459dc352	361
f0fba2ad LG	362	if (cx20442->control_data) {
	363	struct tty_struct *tty = cx20442->control_data;
	364	tty_hangup(tty);
	365	}
459dc352	366
f0fba2ad	367	kfree(cx20442);
459dc352 JK	368	return 0;
	369	}
	370
f0fba2ad	371	static struct snd_soc_codec_driver cx20442_codec_dev = {
459dc352 JK	372	.probe = cx20442_codec_probe,
459dc352 JK	373	.remove = cx20442_codec_remove,
f0fba2ad LG	374	.reg_cache_size = 1,
	375	.reg_word_size = sizeof(u8),
	376	.read = cx20442_read_reg_cache,
	377	.write = cx20442_write,
459dc352	378	};
459dc352 JK	379
	380	static int cx20442_platform_probe(struct platform_device *pdev)
	381	{
f0fba2ad LG	382	return snd_soc_register_codec(&pdev->dev,
f0fba2ad LG	383	&cx20442_codec_dev, &cx20442_dai, 1);
459dc352 JK	384	}
	385
	386	static int __exit cx20442_platform_remove(struct platform_device *pdev)
	387	{
f0fba2ad	388	snd_soc_unregister_codec(&pdev->dev);
459dc352 JK	389	return 0;
	390	}
	391
	392	static struct platform_driver cx20442_platform_driver = {
	393	.driver = {
f0fba2ad	394	.name = "cx20442-codec",
459dc352 JK	395	.owner = THIS_MODULE,
	396	},
	397	.probe = cx20442_platform_probe,
	398	.remove = __exit_p(cx20442_platform_remove),
	399	};
	400
	401	static int __init cx20442_init(void)
	402	{
	403	return platform_driver_register(&cx20442_platform_driver);
	404	}
	405	module_init(cx20442_init);
	406
	407	static void __exit cx20442_exit(void)
	408	{
	409	platform_driver_unregister(&cx20442_platform_driver);
	410	}
	411	module_exit(cx20442_exit);
	412
	413	MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
	414	MODULE_AUTHOR("Janusz Krzysztofik");
	415	MODULE_LICENSE("GPL");
f0fba2ad	416	MODULE_ALIAS("platform:cx20442-codec");