[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 <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;
	codec->private_data = 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 JK	16	#include <linux/tty.h>
ad120dae JK	17
459dc352 JK	18	#include <sound/core.h>
	19	#include <sound/initval.h>
	20	#include <sound/soc-dapm.h>
	21
	22	#include "cx20442.h"
	23
	24
	25	struct cx20442_priv {
	26	struct snd_soc_codec codec;
	27	u8 reg_cache[1];
	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
88	static int cx20442_add_widgets(struct snd_soc_codec *codec)
89	{
90	snd_soc_dapm_new_controls(codec, cx20442_dapm_widgets,
91	ARRAY_SIZE(cx20442_dapm_widgets));
92
93	snd_soc_dapm_add_routes(codec, cx20442_audio_map,
94	ARRAY_SIZE(cx20442_audio_map));
95
459dc352 JK	96	return 0;
	97	}
	98
	99	static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
	100	unsigned int reg)
	101	{
	102	u8 *reg_cache = codec->reg_cache;
	103
	104	if (reg >= codec->reg_cache_size)
	105	return -EINVAL;
	106
	107	return reg_cache[reg];
	108	}
	109
	110	enum v253_vls {
	111	V253_VLS_NONE = 0,
	112	V253_VLS_T,
	113	V253_VLS_L,
	114	V253_VLS_LT,
	115	V253_VLS_S,
	116	V253_VLS_ST,
	117	V253_VLS_M,
	118	V253_VLS_MST,
	119	V253_VLS_S1,
	120	V253_VLS_S1T,
	121	V253_VLS_MS1T,
	122	V253_VLS_M1,
	123	V253_VLS_M1ST,
	124	V253_VLS_M1S1T,
	125	V253_VLS_H,
	126	V253_VLS_HT,
	127	V253_VLS_MS,
	128	V253_VLS_MS1,
	129	V253_VLS_M1S,
	130	V253_VLS_M1S1,
	131	V253_VLS_TEST,
	132	};
	133
	134	static int cx20442_pm_to_v253_vls(u8 value)
	135	{
b84eab08	136	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	137	case 0:
	138	return V253_VLS_T;
	139	case (1 << CX20442_SPKOUT):
459dc352	140	case (1 << CX20442_MIC):
459dc352 JK	141	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	142	return V253_VLS_M1S1;
	143	case (1 << CX20442_TELOUT):
	144	case (1 << CX20442_TELIN):
	145	case (1 << CX20442_TELOUT) \| (1 << CX20442_TELIN):
	146	return V253_VLS_L;
	147	case (1 << CX20442_TELOUT) \| (1 << CX20442_MIC):
	148	return V253_VLS_NONE;
	149	}
	150	return -EINVAL;
	151	}
	152	static int cx20442_pm_to_v253_vsp(u8 value)
	153	{
b84eab08	154	switch (value & ~(1 << CX20442_AGC)) {
459dc352 JK	155	case (1 << CX20442_SPKOUT):
	156	case (1 << CX20442_MIC):
	157	case (1 << CX20442_SPKOUT) \| (1 << CX20442_MIC):
	158	return (bool)(value & (1 << CX20442_AGC));
	159	}
	160	return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
	161	}
	162
	163	static int cx20442_write(struct snd_soc_codec *codec, unsigned int reg,
	164	unsigned int value)
	165	{
	166	u8 *reg_cache = codec->reg_cache;
	167	int vls, vsp, old, len;
	168	char buf[18];
	169
	170	if (reg >= codec->reg_cache_size)
	171	return -EINVAL;
	172
b84eab08	173	/* hw_write and control_data pointers required for talking to the modem
ad120dae	174	* are expected to be set by the line discipline initialization code */
459dc352 JK	175	if (!codec->hw_write \|\| !codec->control_data)
	176	return -EIO;
	177
	178	old = reg_cache[reg];
	179	reg_cache[reg] = value;
	180
	181	vls = cx20442_pm_to_v253_vls(value);
	182	if (vls < 0)
	183	return vls;
	184
	185	vsp = cx20442_pm_to_v253_vsp(value);
b84eab08	186	if (vsp < 0)
459dc352 JK	187	return vsp;
	188
	189	if ((vls == V253_VLS_T) \|\|
	190	(vls == cx20442_pm_to_v253_vls(old))) {
	191	if (vsp == cx20442_pm_to_v253_vsp(old))
	192	return 0;
	193	len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
	194	} else if (vsp == cx20442_pm_to_v253_vsp(old))
	195	len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
	196	else
	197	len = snprintf(buf, ARRAY_SIZE(buf),
	198	"at+vls=%d;+vsp=%d\r", vls, vsp);
	199
	200	if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
	201	return -ENOMEM;
	202
4977b03e	203	dev_dbg(codec->dev, "%s: %s\n", __func__, buf);
459dc352 JK	204	if (codec->hw_write(codec->control_data, buf, len) != len)
	205	return -EIO;
	206
	207	return 0;
	208	}
	209
ad120dae JK	210
	211	/* Moved up here as line discipline referres it during initialization */
	212	static struct snd_soc_codec *cx20442_codec;
	213
	214
	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	{
	230	struct snd_soc_codec *codec = cx20442_codec;
	231	int ret, len = strlen(v253_init);
	232
	233	/* Doesn't make sense without write callback */
	234	if (!tty->ops->write)
	235	return -EINVAL;
	236
	237	/* Pass the codec structure address for use by other ldisc callbacks */
	238	tty->disc_data = codec;
	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;
	255
	256	tty->disc_data = NULL;
	257
	258	if (!codec)
	259	return;
	260
	261	/* Prevent the codec driver from further accessing the modem */
	262	codec->hw_write = NULL;
	263	codec->control_data = NULL;
	264	codec->pop_time = 0;
	265	}
	266
	267	/* Line discipline .hangup() */
	268	static int v253_hangup(struct tty_struct *tty)
	269	{
	270	v253_close(tty);
	271	return 0;
	272	}
	273
274	/* Line discipline .receive_buf() */
275	static void v253_receive(struct tty_struct *tty,
276	const unsigned char cp, char fp, int count)
277	{
278	struct snd_soc_codec *codec = tty->disc_data;
279
280	if (!codec)
281	return;
282
283	if (!codec->control_data) {
284	/* First modem response, complete setup procedure */
285
286	/* Set up codec driver access to modem controls */
287	codec->control_data = tty;
288	codec->hw_write = (hw_write_t)tty->ops->write;
289	codec->pop_time = 1;
290	}
291	}
292
293	/* Line discipline .write_wakeup() */
294	static void v253_wakeup(struct tty_struct *tty)
295	{
296	}
297
298	struct tty_ldisc_ops v253_ops = {
299	.magic = TTY_LDISC_MAGIC,
300	.name = "cx20442",
301	.owner = THIS_MODULE,
302	.open = v253_open,
303	.close = v253_close,
304	.hangup = v253_hangup,
305	.receive_buf = v253_receive,
306	.write_wakeup = v253_wakeup,
307	};
308	EXPORT_SYMBOL_GPL(v253_ops);
309
310
311	/*
312	* Codec DAI
313	*/
314
459dc352 JK	315	struct snd_soc_dai cx20442_dai = {
	316	.name = "CX20442",
	317	.playback = {
	318	.stream_name = "Playback",
	319	.channels_min = 1,
	320	.channels_max = 1,
	321	.rates = SNDRV_PCM_RATE_8000,
	322	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	323	},
	324	.capture = {
	325	.stream_name = "Capture",
	326	.channels_min = 1,
	327	.channels_max = 1,
	328	.rates = SNDRV_PCM_RATE_8000,
	329	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	330	},
	331	};
	332	EXPORT_SYMBOL_GPL(cx20442_dai);
	333
459dc352 JK	334	static int cx20442_codec_probe(struct platform_device *pdev)
	335	{
	336	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	337	struct snd_soc_codec *codec;
	338	int ret;
	339
b84eab08	340	if (!cx20442_codec) {
459dc352 JK	341	dev_err(&pdev->dev, "cx20442 not yet discovered\n");
	342	return -ENODEV;
	343	}
	344	codec = cx20442_codec;
	345
	346	socdev->card->codec = codec;
	347
	348	/* register pcms */
	349	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	350	if (ret < 0) {
	351	dev_err(&pdev->dev, "failed to create pcms\n");
	352	goto pcm_err;
	353	}
	354
	355	cx20442_add_widgets(codec);
	356
459dc352 JK	357	pcm_err:
	358	return ret;
	359	}
	360
	361	/* power down chip */
	362	static int cx20442_codec_remove(struct platform_device *pdev)
	363	{
	364	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	365
	366	snd_soc_free_pcms(socdev);
	367	snd_soc_dapm_free(socdev);
	368
	369	return 0;
	370	}
	371
	372	struct snd_soc_codec_device cx20442_codec_dev = {
	373	.probe = cx20442_codec_probe,
	374	.remove = cx20442_codec_remove,
	375	};
	376	EXPORT_SYMBOL_GPL(cx20442_codec_dev);
	377
	378	static int cx20442_register(struct cx20442_priv *cx20442)
	379	{
	380	struct snd_soc_codec *codec = &cx20442->codec;
	381	int ret;
	382
	383	mutex_init(&codec->mutex);
	384	INIT_LIST_HEAD(&codec->dapm_widgets);
	385	INIT_LIST_HEAD(&codec->dapm_paths);
	386
	387	codec->name = "CX20442";
	388	codec->owner = THIS_MODULE;
	389	codec->private_data = cx20442;
	390
	391	codec->dai = &cx20442_dai;
	392	codec->num_dai = 1;
	393
	394	codec->reg_cache = &cx20442->reg_cache;
	395	codec->reg_cache_size = ARRAY_SIZE(cx20442->reg_cache);
	396	codec->read = cx20442_read_reg_cache;
	397	codec->write = cx20442_write;
	398
	399	codec->bias_level = SND_SOC_BIAS_OFF;
	400
	401	cx20442_dai.dev = codec->dev;
	402
	403	cx20442_codec = codec;
	404
	405	ret = snd_soc_register_codec(codec);
	406	if (ret != 0) {
ad120dae	407	dev_err(codec->dev, "Failed to register codec: %d\n", ret);
459dc352 JK	408	goto err;
	409	}
	410
	411	ret = snd_soc_register_dai(&cx20442_dai);
	412	if (ret != 0) {
ad120dae	413	dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
459dc352 JK	414	goto err_codec;
	415	}
	416
	417	return 0;
	418
	419	err_codec:
	420	snd_soc_unregister_codec(codec);
	421	err:
	422	cx20442_codec = NULL;
	423	kfree(cx20442);
	424	return ret;
	425	}
	426
	427	static void cx20442_unregister(struct cx20442_priv *cx20442)
	428	{
	429	snd_soc_unregister_dai(&cx20442_dai);
	430	snd_soc_unregister_codec(&cx20442->codec);
	431
	432	cx20442_codec = NULL;
	433	kfree(cx20442);
	434	}
	435
	436	static int cx20442_platform_probe(struct platform_device *pdev)
	437	{
	438	struct cx20442_priv *cx20442;
	439	struct snd_soc_codec *codec;
	440
	441	cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
	442	if (cx20442 == NULL)
	443	return -ENOMEM;
	444
	445	codec = &cx20442->codec;
	446
	447	codec->control_data = NULL;
	448	codec->hw_write = NULL;
	449	codec->pop_time = 0;
	450
	451	codec->dev = &pdev->dev;
	452	platform_set_drvdata(pdev, cx20442);
	453
	454	return cx20442_register(cx20442);
	455	}
	456
	457	static int __exit cx20442_platform_remove(struct platform_device *pdev)
	458	{
	459	struct cx20442_priv *cx20442 = platform_get_drvdata(pdev);
	460
	461	cx20442_unregister(cx20442);
	462	return 0;
	463	}
	464
	465	static struct platform_driver cx20442_platform_driver = {
	466	.driver = {
	467	.name = "cx20442",
	468	.owner = THIS_MODULE,
	469	},
	470	.probe = cx20442_platform_probe,
	471	.remove = __exit_p(cx20442_platform_remove),
	472	};
	473
	474	static int __init cx20442_init(void)
	475	{
	476	return platform_driver_register(&cx20442_platform_driver);
	477	}
478	module_init(cx20442_init);
479
480	static void __exit cx20442_exit(void)
481	{
482	platform_driver_unregister(&cx20442_platform_driver);
483	}
484	module_exit(cx20442_exit);
485
486	MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
487	MODULE_AUTHOR("Janusz Krzysztofik");
488	MODULE_LICENSE("GPL");
b84eab08	489	MODULE_ALIAS("platform:cx20442");