[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 <sound/core.h>
#include <sound/initval.h>
#include <sound/soc-dapm.h>

#include "cx20442.h"


struct cx20442_priv {
	struct snd_soc_codec codec;
	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)
{
	snd_soc_dapm_new_controls(codec, cx20442_dapm_widgets,
				  ARRAY_SIZE(cx20442_dapm_widgets));

	snd_soc_dapm_add_routes(codec, 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->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)
{
	u8 *reg_cache = codec->reg_cache;
	int vls, vsp, old, len;
	char buf[18];

	if (reg >= codec->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 || !codec->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(codec->control_data, buf, len) != len)
		return -EIO;

	return 0;
}


/* Moved up here as line discipline referres it during initialization */
static struct snd_soc_codec *cx20442_codec;


/*
 * 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)
{
	struct snd_soc_codec *codec = cx20442_codec;
	int ret, len = strlen(v253_init);

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

	/* Pass the codec structure address for use by other ldisc callbacks */
	tty->disc_data = codec;

	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;

	tty->disc_data = NULL;

	if (!codec)
		return;

	/* Prevent the codec driver from further accessing the modem */
	codec->hw_write = NULL;
	codec->control_data = NULL;
	codec->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;

	if (!codec)
		return;

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

		/* Set up codec driver access to modem controls */
		codec->control_data = tty;
		codec->hw_write = (hw_write_t)tty->ops->write;
		codec->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
 */

struct snd_soc_dai cx20442_dai = {
	.name = "CX20442",
	.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,
	},
};
EXPORT_SYMBOL_GPL(cx20442_dai);

static int cx20442_codec_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret;

	if (!cx20442_codec) {
		dev_err(&pdev->dev, "cx20442 not yet discovered\n");
		return -ENODEV;
	}
	codec = cx20442_codec;

	socdev->card->codec = codec;

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to create pcms\n");
		goto pcm_err;
	}

	cx20442_add_widgets(codec);

pcm_err:
	return ret;
}

/* power down chip */
static int cx20442_codec_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	return 0;
}

struct snd_soc_codec_device cx20442_codec_dev = {
	.probe = 	cx20442_codec_probe,
	.remove = 	cx20442_codec_remove,
};
EXPORT_SYMBOL_GPL(cx20442_codec_dev);

static int cx20442_register(struct cx20442_priv *cx20442)
{
	struct snd_soc_codec *codec = &cx20442->codec;
	int ret;

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	codec->name = "CX20442";
	codec->owner = THIS_MODULE;
	snd_soc_codec_set_drvdata(codec, cx20442);

	codec->dai = &cx20442_dai;
	codec->num_dai = 1;

	codec->reg_cache = &cx20442->reg_cache;
	codec->reg_cache_size = ARRAY_SIZE(cx20442->reg_cache);
	codec->read = cx20442_read_reg_cache;
	codec->write = cx20442_write;

	codec->bias_level = SND_SOC_BIAS_OFF;

	cx20442_dai.dev = codec->dev;

	cx20442_codec = codec;

	ret = snd_soc_register_codec(codec);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
		goto err;
	}

	ret = snd_soc_register_dai(&cx20442_dai);
	if (ret != 0) {
		dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
		goto err_codec;
	}

	return 0;

err_codec:
	snd_soc_unregister_codec(codec);
err:
	cx20442_codec = NULL;
	kfree(cx20442);
	return ret;
}

static void cx20442_unregister(struct cx20442_priv *cx20442)
{
	snd_soc_unregister_dai(&cx20442_dai);
	snd_soc_unregister_codec(&cx20442->codec);

	cx20442_codec = NULL;
	kfree(cx20442);
}

static int cx20442_platform_probe(struct platform_device *pdev)
{
	struct cx20442_priv *cx20442;
	struct snd_soc_codec *codec;

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

	codec = &cx20442->codec;

	codec->control_data = NULL;
	codec->hw_write = NULL;
	codec->pop_time = 0;

	codec->dev = &pdev->dev;
	platform_set_drvdata(pdev, cx20442);

	return cx20442_register(cx20442);
}

static int __exit cx20442_platform_remove(struct platform_device *pdev)
{
	struct cx20442_priv *cx20442 = platform_get_drvdata(pdev);

	cx20442_unregister(cx20442);
	return 0;
}

static struct platform_driver cx20442_platform_driver = {
	.driver = {
		.name = "cx20442",
		.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");
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>
	20	#include <sound/initval.h>
	21	#include <sound/soc-dapm.h>
	22
	23	#include "cx20442.h"
	24
	25
	26	struct cx20442_priv {
	27	struct snd_soc_codec codec;
	28	u8 reg_cache[1];
	29	};
	30
	31	#define CX20442_PM 0x0
	32
	33	#define CX20442_TELIN 0
	34	#define CX20442_TELOUT 1
	35	#define CX20442_MIC 2
	36	#define CX20442_SPKOUT 3
	37	#define CX20442_AGC 4
	38
	39	static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
	40	SND_SOC_DAPM_OUTPUT("TELOUT"),
	41	SND_SOC_DAPM_OUTPUT("SPKOUT"),
	42	SND_SOC_DAPM_OUTPUT("AGCOUT"),
	43
	44	SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	45
	46	SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
	47	SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
	48	SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	49
	50	SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
	51	SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
	52
	53	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	54
	55	SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
	56	SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
	57
	58	SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
	59
	60	SND_SOC_DAPM_INPUT("TELIN"),
	61	SND_SOC_DAPM_INPUT("MIC"),
	62	SND_SOC_DAPM_INPUT("AGCIN"),
	63	};
	64
	65	static const struct snd_soc_dapm_route cx20442_audio_map[] = {
	66	{"TELOUT", NULL, "TELOUT Amp"},
	67
	68	{"SPKOUT", NULL, "SPKOUT Mixer"},
	69	{"SPKOUT Mixer", NULL, "SPKOUT Amp"},
	70
	71	{"TELOUT Amp", NULL, "DAC"},
	72	{"SPKOUT Amp", NULL, "DAC"},
	73
	74	{"SPKOUT Mixer", NULL, "SPKOUT AGC"},
	75	{"SPKOUT AGC", NULL, "AGCIN"},
	76
	77	{"AGCOUT", NULL, "MIC AGC"},
	78	{"MIC AGC", NULL, "MIC"},
	79
	80	{"MIC Bias", NULL, "MIC"},
	81	{"Input Mixer", NULL, "MIC Bias"},
	82
83	{"TELIN Bias", NULL, "TELIN"},
84	{"Input Mixer", NULL, "TELIN Bias"},
85
86	{"ADC", NULL, "Input Mixer"},
87	};
88
89	static int cx20442_add_widgets(struct snd_soc_codec *codec)
90	{
91	snd_soc_dapm_new_controls(codec, cx20442_dapm_widgets,
92	ARRAY_SIZE(cx20442_dapm_widgets));
93
94	snd_soc_dapm_add_routes(codec, cx20442_audio_map,
95	ARRAY_SIZE(cx20442_audio_map));
96
459dc352 JK	97	return 0;
	98	}
	99
	100	static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
	101	unsigned int reg)
	102	{
	103	u8 *reg_cache = codec->reg_cache;
	104
	105	if (reg >= codec->reg_cache_size)
	106	return -EINVAL;
	107
	108	return reg_cache[reg];
	109	}
	110
	111	enum v253_vls {
	112	V253_VLS_NONE = 0,
	113	V253_VLS_T,
	114	V253_VLS_L,
	115	V253_VLS_LT,
	116	V253_VLS_S,
	117	V253_VLS_ST,
	118	V253_VLS_M,
	119	V253_VLS_MST,
	120	V253_VLS_S1,
	121	V253_VLS_S1T,
	122	V253_VLS_MS1T,
	123	V253_VLS_M1,
	124	V253_VLS_M1ST,
	125	V253_VLS_M1S1T,
	126	V253_VLS_H,
	127	V253_VLS_HT,
	128	V253_VLS_MS,
	129	V253_VLS_MS1,
	130	V253_VLS_M1S,
	131	V253_VLS_M1S1,
	132	V253_VLS_TEST,
	133	};
	134
	135	static int cx20442_pm_to_v253_vls(u8 value)
	136	{
b84eab08	137	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	138	case 0:
	139	return V253_VLS_T;
	140	case (1 << CX20442_SPKOUT):
459dc352	141	case (1 << CX20442_MIC):
459dc352 JK	142	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	143	return V253_VLS_M1S1;
	144	case (1 << CX20442_TELOUT):
	145	case (1 << CX20442_TELIN):
	146	case (1 << CX20442_TELOUT) \| (1 << CX20442_TELIN):
	147	return V253_VLS_L;
	148	case (1 << CX20442_TELOUT) \| (1 << CX20442_MIC):
	149	return V253_VLS_NONE;
	150	}
	151	return -EINVAL;
	152	}
	153	static int cx20442_pm_to_v253_vsp(u8 value)
	154	{
b84eab08	155	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	156	case (1 << CX20442_SPKOUT):
	157	case (1 << CX20442_MIC):
	158	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	159	return (bool)(value & (1 << CX20442_AGC));
	160	}
	161	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
	162	}
	163
	164	static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
	165	unsigned int value)
	166	{
	167	u8 *reg_cache = codec->reg_cache;
	168	int vls, vsp, old, len;
	169	char buf[18];
	170
	171	if (reg >= codec->reg_cache_size)
	172	return -EINVAL;
	173
b84eab08	174	/* hw_write and control_data pointers required for talking to the modem
ad120dae	175	* are expected to be set by the line discipline initialization code */
459dc352 JK	176	if (!codec->hw_write \|\| !codec->control_data)
	177	return -EIO;
	178
	179	old = reg_cache[reg];
	180	reg_cache[reg] = value;
	181
	182	vls = cx20442_pm_to_v253_vls(value);
	183	if (vls < 0)
	184	return vls;
	185
	186	vsp = cx20442_pm_to_v253_vsp(value);
b84eab08	187	if (vsp < 0)
459dc352 JK	188	return vsp;
	189
	190	if ((vls == V253_VLS_T) \|\|
	191	(vls == cx20442_pm_to_v253_vls(old))) {
	192	if (vsp == cx20442_pm_to_v253_vsp(old))
	193	return 0;
	194	len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
	195	} else if (vsp == cx20442_pm_to_v253_vsp(old))
	196	len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
	197	else
	198	len = snprintf(buf, ARRAY_SIZE(buf),
	199	"at+vls=%d;+vsp=%d\r", vls, vsp);
	200
	201	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
	202	return -ENOMEM;
	203
4977b03e	204	dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
459dc352 JK	205	if (codec->hw_write(codec->control_data, buf, len) != len)
	206	return -EIO;
	207
	208	return 0;
	209	}
	210
ad120dae JK	211
	212	/* Moved up here as line discipline referres it during initialization */
	213	static struct snd_soc_codec *cx20442_codec;
	214
	215
	216	/*
	217	* Line discpline related code
	218	*
	219	* Any of the callback functions below can be used in two ways:
	220	* 1) registerd by a machine driver as one of line discipline operations,
	221	* 2) called from a machine's provided line discipline callback function
	222	* in case when extra machine specific code must be run as well.
	223	*/
	224
	225	/* Modem init: echo off, digital speaker off, quiet off, voice mode */
	226	static const char *v253_init = "ate0m0q0+fclass=8\r";
	227
	228	/* Line discipline .open() */
	229	static int v253_open(struct tty_struct *tty)
	230	{
	231	struct snd_soc_codec *codec = cx20442_codec;
	232	int ret, len = strlen(v253_init);
	233
	234	/* Doesn't make sense without write callback */
	235	if (!tty->ops->write)
	236	return -EINVAL;
	237
	238	/* Pass the codec structure address for use by other ldisc callbacks */
	239	tty->disc_data = codec;
	240
	241	if (tty->ops->write(tty, v253_init, len) != len) {
	242	ret = -EIO;
	243	goto err;
	244	}
	245	/* Actual setup will be performed after the modem responds. */
	246	return 0;
	247	err:
	248	tty->disc_data = NULL;
	249	return ret;
	250	}
	251
	252	/* Line discipline .close() */
	253	static void v253_close(struct tty_struct *tty)
	254	{
	255	struct snd_soc_codec *codec = tty->disc_data;
	256
	257	tty->disc_data = NULL;
	258
	259	if (!codec)
	260	return;
	261
	262	/* Prevent the codec driver from further accessing the modem */
	263	codec->hw_write = NULL;
	264	codec->control_data = NULL;
	265	codec->pop_time = 0;
	266	}
	267
	268	/* Line discipline .hangup() */
	269	static int v253_hangup(struct tty_struct *tty)
	270	{
	271	v253_close(tty);
	272	return 0;
	273	}
	274
275	/* Line discipline .receive_buf() */
276	static void v253_receive(struct tty_struct *tty,
277	const unsigned char cp, char fp, int count)
278	{
279	struct snd_soc_codec *codec = tty->disc_data;
280
281	if (!codec)
282	return;
283
284	if (!codec->control_data) {
285	/* First modem response, complete setup procedure */
286
287	/* Set up codec driver access to modem controls */
288	codec->control_data = tty;
289	codec->hw_write = (hw_write_t)tty->ops->write;
290	codec->pop_time = 1;
291	}
292	}
293
294	/* Line discipline .write_wakeup() */
295	static void v253_wakeup(struct tty_struct *tty)
296	{
297	}
298
299	struct tty_ldisc_ops v253_ops = {
300	.magic = TTY_LDISC_MAGIC,
301	.name = "cx20442",
302	.owner = THIS_MODULE,
303	.open = v253_open,
304	.close = v253_close,
305	.hangup = v253_hangup,
306	.receive_buf = v253_receive,
307	.write_wakeup = v253_wakeup,
308	};
309	EXPORT_SYMBOL_GPL(v253_ops);
310
311
312	/*
313	* Codec DAI
314	*/
315
459dc352 JK	316	struct snd_soc_dai cx20442_dai = {
	317	.name = "CX20442",
	318	.playback = {
	319	.stream_name = "Playback",
	320	.channels_min = 1,
	321	.channels_max = 1,
	322	.rates = SNDRV_PCM_RATE_8000,
	323	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	324	},
	325	.capture = {
	326	.stream_name = "Capture",
	327	.channels_min = 1,
	328	.channels_max = 1,
	329	.rates = SNDRV_PCM_RATE_8000,
	330	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	331	},
	332	};
	333	EXPORT_SYMBOL_GPL(cx20442_dai);
	334
459dc352 JK	335	static int cx20442_codec_probe(struct platform_device *pdev)
	336	{
	337	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	338	struct snd_soc_codec *codec;
	339	int ret;
	340
b84eab08	341	if (!cx20442_codec) {
459dc352 JK	342	dev_err(&pdev->dev, "cx20442 not yet discovered\n");
	343	return -ENODEV;
	344	}
	345	codec = cx20442_codec;
	346
	347	socdev->card->codec = codec;
	348
	349	/* register pcms */
	350	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	351	if (ret < 0) {
	352	dev_err(&pdev->dev, "failed to create pcms\n");
	353	goto pcm_err;
	354	}
	355
	356	cx20442_add_widgets(codec);
	357
459dc352 JK	358	pcm_err:
	359	return ret;
	360	}
	361
	362	/* power down chip */
	363	static int cx20442_codec_remove(struct platform_device *pdev)
	364	{
	365	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	366
	367	snd_soc_free_pcms(socdev);
	368	snd_soc_dapm_free(socdev);
	369
	370	return 0;
	371	}
	372
	373	struct snd_soc_codec_device cx20442_codec_dev = {
	374	.probe = cx20442_codec_probe,
	375	.remove = cx20442_codec_remove,
	376	};
	377	EXPORT_SYMBOL_GPL(cx20442_codec_dev);
	378
	379	static int cx20442_register(struct cx20442_priv *cx20442)
	380	{
	381	struct snd_soc_codec *codec = &cx20442->codec;
	382	int ret;
	383
	384	mutex_init(&codec->mutex);
	385	INIT_LIST_HEAD(&codec->dapm_widgets);
	386	INIT_LIST_HEAD(&codec->dapm_paths);
	387
	388	codec->name = "CX20442";
	389	codec->owner = THIS_MODULE;
b2c812e2	390	snd_soc_codec_set_drvdata(codec, cx20442);
459dc352 JK	391
	392	codec->dai = &cx20442_dai;
	393	codec->num_dai = 1;
	394
	395	codec->reg_cache = &cx20442->reg_cache;
	396	codec->reg_cache_size = ARRAY_SIZE(cx20442->reg_cache);
	397	codec->read = cx20442_read_reg_cache;
	398	codec->write = cx20442_write;
	399
	400	codec->bias_level = SND_SOC_BIAS_OFF;
	401
	402	cx20442_dai.dev = codec->dev;
	403
	404	cx20442_codec = codec;
	405
	406	ret = snd_soc_register_codec(codec);
	407	if (ret != 0) {
ad120dae	408	dev_err(codec->dev, "Failed to register codec: %d\n", ret);
459dc352 JK	409	goto err;
	410	}
	411
	412	ret = snd_soc_register_dai(&cx20442_dai);
	413	if (ret != 0) {
ad120dae	414	dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
459dc352 JK	415	goto err_codec;
	416	}
	417
	418	return 0;
	419
	420	err_codec:
	421	snd_soc_unregister_codec(codec);
	422	err:
	423	cx20442_codec = NULL;
	424	kfree(cx20442);
	425	return ret;
	426	}
	427
	428	static void cx20442_unregister(struct cx20442_priv *cx20442)
	429	{
	430	snd_soc_unregister_dai(&cx20442_dai);
	431	snd_soc_unregister_codec(&cx20442->codec);
	432
	433	cx20442_codec = NULL;
	434	kfree(cx20442);
	435	}
	436
	437	static int cx20442_platform_probe(struct platform_device *pdev)
	438	{
	439	struct cx20442_priv *cx20442;
	440	struct snd_soc_codec *codec;
	441
	442	cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
	443	if (cx20442 == NULL)
	444	return -ENOMEM;
	445
	446	codec = &cx20442->codec;
	447
	448	codec->control_data = NULL;
	449	codec->hw_write = NULL;
	450	codec->pop_time = 0;
	451
	452	codec->dev = &pdev->dev;
	453	platform_set_drvdata(pdev, cx20442);
	454
	455	return cx20442_register(cx20442);
	456	}
	457
	458	static int __exit cx20442_platform_remove(struct platform_device *pdev)
	459	{
	460	struct cx20442_priv *cx20442 = platform_get_drvdata(pdev);
	461
	462	cx20442_unregister(cx20442);
	463	return 0;
	464	}
	465
	466	static struct platform_driver cx20442_platform_driver = {
	467	.driver = {
	468	.name = "cx20442",
	469	.owner = THIS_MODULE,
	470	},
	471	.probe = cx20442_platform_probe,
	472	.remove = __exit_p(cx20442_platform_remove),
	473	};
	474
	475	static int __init cx20442_init(void)
	476	{
	477	return platform_driver_register(&cx20442_platform_driver);
	478	}
479	module_init(cx20442_init);
480
481	static void __exit cx20442_exit(void)
482	{
483	platform_driver_unregister(&cx20442_platform_driver);
484	}
485	module_exit(cx20442_exit);
486
487	MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
488	MODULE_AUTHOR("Janusz Krzysztofik");
489	MODULE_LICENSE("GPL");
b84eab08	490	MODULE_ALIAS("platform:cx20442");