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alistair23-linux/sound/soc/codecs/cx20442.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#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 {
struct tty_struct *tty;
struct regulator *por;
u8 reg_cache;
};
#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_component *component,
unsigned int reg)
{
struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
if (reg >= 1)
return -EINVAL;
return cx20442->reg_cache;
}
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_component *component, unsigned int reg,
unsigned int value)
{
struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
int vls, vsp, old, len;
char buf[18];
if (reg >= 1)
return -EINVAL;
/* tty and write pointers required for talking to the modem
* are expected to be set by the line discipline initialization code */
if (!cx20442->tty || !cx20442->tty->ops->write)
return -EIO;
old = cx20442->reg_cache;
cx20442->reg_cache = 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(component->dev, "%s: %s\n", __func__, buf);
if (cx20442->tty->ops->write(cx20442->tty, 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;
tty->receive_room = 16;
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_component *component = tty->disc_data;
struct cx20442_priv *cx20442;
tty->disc_data = NULL;
if (!component)
return;
cx20442 = snd_soc_component_get_drvdata(component);
/* Prevent the codec driver from further accessing the modem */
cx20442->tty = NULL;
component->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_component *component = tty->disc_data;
struct cx20442_priv *cx20442;
if (!component)
return;
cx20442 = snd_soc_component_get_drvdata(component);
if (!cx20442->tty) {
/* First modem response, complete setup procedure */
/* Set up codec driver access to modem controls */
cx20442->tty = tty;
component->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_component *component,
enum snd_soc_bias_level level)
{
struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
int err = 0;
switch (level) {
case SND_SOC_BIAS_PREPARE:
if (snd_soc_component_get_bias_level(component) != 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 (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE)
break;
if (IS_ERR(cx20442->por))
err = PTR_ERR(cx20442->por);
else
err = regulator_disable(cx20442->por);
break;
default:
break;
}
return err;
}
static int cx20442_component_probe(struct snd_soc_component *component)
{
struct cx20442_priv *cx20442;
cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
if (cx20442 == NULL)
return -ENOMEM;
cx20442->por = regulator_get(component->dev, "POR");
if (IS_ERR(cx20442->por)) {
int err = PTR_ERR(cx20442->por);
dev_warn(component->dev, "failed to get POR supply (%d)", err);
/*
* When running on a non-dt platform and requested regulator
* is not available, regulator_get() never returns
* -EPROBE_DEFER as it is not able to justify if the regulator
* may still appear later. On the other hand, the board can
* still set full constraints flag at late_initcall in order
* to instruct regulator_get() to return a dummy one if
* sufficient. Hence, if we get -ENODEV here, let's convert
* it to -EPROBE_DEFER and wait for the board to decide or
* let Deferred Probe infrastructure handle this error.
*/
if (err == -ENODEV)
err = -EPROBE_DEFER;
kfree(cx20442);
return err;
}
cx20442->tty = NULL;
snd_soc_component_set_drvdata(component, cx20442);
component->card->pop_time = 0;
return 0;
}
/* power down chip */
static void cx20442_component_remove(struct snd_soc_component *component)
{
struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
if (cx20442->tty) {
struct tty_struct *tty = cx20442->tty;
tty_hangup(tty);
}
if (!IS_ERR(cx20442->por)) {
/* should be already in STANDBY, hence disabled */
regulator_put(cx20442->por);
}
snd_soc_component_set_drvdata(component, NULL);
kfree(cx20442);
}
static const struct snd_soc_component_driver cx20442_component_dev = {
.probe = cx20442_component_probe,
.remove = cx20442_component_remove,
.set_bias_level = cx20442_set_bias_level,
.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),
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
.non_legacy_dai_naming = 1,
};
static int cx20442_platform_probe(struct platform_device *pdev)
{
return devm_snd_soc_register_component(&pdev->dev,
&cx20442_component_dev, &cx20442_dai, 1);
}
static struct platform_driver cx20442_platform_driver = {
.driver = {
.name = "cx20442-codec",
},
.probe = cx20442_platform_probe,
};
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");
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