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// SPDX-License-Identifier: GPL-2.0
//
// TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec
//
// Copyright (C) 2016 Axentia Technologies AB
//
// Author: Peter Rosin <peda@axentia.se>
//
// loop1 relays
// IN1 +---o +------------+ o---+ OUT1
// \ /
// + +
// | / |
// +--o +--. |
// | add | |
// | V |
// | .---. |
// DAC +----------->|Sum|---+
// | '---' |
// | |
// + +
//
// IN2 +---o--+------------+--o---+ OUT2
// loop2 relays
//
// The 'loop1' gpio pin controlls two relays, which are either in loop
// position, meaning that input and output are directly connected, or
// they are in mixer position, meaning that the signal is passed through
// the 'Sum' mixer. Similarly for 'loop2'.
//
// In the above, the 'loop1' relays are inactive, thus feeding IN1 to the
// mixer (if 'add' is active) and feeding the mixer output to OUT1. The
// 'loop2' relays are active, short-cutting the TSE-850 from channel 2.
// IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name
// of the (filtered) output from the PCM5142 codec.
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/regulator/consumer.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
struct tse850_priv {
struct gpio_desc *add;
struct gpio_desc *loop1;
struct gpio_desc *loop2;
struct regulator *ana;
int add_cache;
int loop1_cache;
int loop2_cache;
};
static int tse850_get_mux1(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
ucontrol->value.enumerated.item[0] = tse850->loop1_cache;
return 0;
}
static int tse850_put_mux1(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
unsigned int val = ucontrol->value.enumerated.item[0];
if (val >= e->items)
return -EINVAL;
gpiod_set_value_cansleep(tse850->loop1, val);
tse850->loop1_cache = val;
return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
}
static int tse850_get_mux2(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
ucontrol->value.enumerated.item[0] = tse850->loop2_cache;
return 0;
}
static int tse850_put_mux2(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
unsigned int val = ucontrol->value.enumerated.item[0];
if (val >= e->items)
return -EINVAL;
gpiod_set_value_cansleep(tse850->loop2, val);
tse850->loop2_cache = val;
return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
}
static int tse850_get_mix(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
ucontrol->value.enumerated.item[0] = tse850->add_cache;
return 0;
}
static int tse850_put_mix(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
int connect = !!ucontrol->value.integer.value[0];
if (tse850->add_cache == connect)
return 0;
/*
* Hmmm, this gpiod_set_value_cansleep call should probably happen
* inside snd_soc_dapm_mixer_update_power in the loop.
*/
gpiod_set_value_cansleep(tse850->add, connect);
tse850->add_cache = connect;
snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
return 1;
}
static int tse850_get_ana(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
int ret;
ret = regulator_get_voltage(tse850->ana);
if (ret < 0)
return ret;
/*
* Map regulator output values like so:
* -11.5V to "Low" (enum 0)
* 11.5V-12.5V to "12V" (enum 1)
* 12.5V-13.5V to "13V" (enum 2)
* ...
* 18.5V-19.5V to "19V" (enum 8)
* 19.5V- to "20V" (enum 9)
*/
if (ret < 11000000)
ret = 11000000;
else if (ret > 20000000)
ret = 20000000;
ret -= 11000000;
ret = (ret + 500000) / 1000000;
ucontrol->value.enumerated.item[0] = ret;
return 0;
}
static int tse850_put_ana(struct snd_kcontrol *kctrl,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
struct snd_soc_card *card = dapm->card;
struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
unsigned int uV = ucontrol->value.enumerated.item[0];
int ret;
if (uV >= e->items)
return -EINVAL;
/*
* Map enum zero (Low) to 2 volts on the regulator, do this since
* the ana regulator is supplied by the system 12V voltage and
* requesting anything below the system voltage causes the system
* voltage to be passed through the regulator. Also, the ana
* regulator induces noise when requesting voltages near the
* system voltage. So, by mapping Low to 2V, that noise is
* eliminated when all that is needed is 12V (the system voltage).
*/
if (uV)
uV = 11000000 + (1000000 * uV);
else
uV = 2000000;
ret = regulator_set_voltage(tse850->ana, uV, uV);
if (ret < 0)
return ret;
return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
}
static const char * const mux_text[] = { "Mixer", "Loop" };
static const struct soc_enum mux_enum =
SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);
static const struct snd_kcontrol_new mux1 =
SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);
static const struct snd_kcontrol_new mux2 =
SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);
#define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
.info = snd_soc_info_volsw, \
.get = xget, \
.put = xput, \
.private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }
static const struct snd_kcontrol_new mix[] = {
TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
tse850_get_mix, tse850_put_mix),
};
static const char * const ana_text[] = {
"Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
};
static const struct soc_enum ana_enum =
SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);
static const struct snd_kcontrol_new out =
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