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linux-sg2042/sound/soc/codecs/cx20442.c

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/*
* 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");
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