/*
* 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->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->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 (codec->dapm.bias_level != 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 (codec->dapm.bias_level != SND_SOC_BIAS_PREPARE)
break;
if (IS_ERR(cx20442->por))
err = PTR_ERR(cx20442->por);
else
err = regulator_disable(cx20442->por);
break;
default:
break;
}
if (!err)
codec->dapm.bias_level = level;
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->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 __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),
};
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");