450 lines
13 KiB
C
450 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// TSE-850 audio - ASoC driver for the Axentia TSE-850 with a PCM5142 codec
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//
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// Copyright (C) 2016 Axentia Technologies AB
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//
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// Author: Peter Rosin <peda@axentia.se>
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//
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// loop1 relays
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// IN1 +---o +------------+ o---+ OUT1
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// \ /
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// + +
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// | / |
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// +--o +--. |
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// | add | |
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// | V |
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// | .---. |
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// DAC +----------->|Sum|---+
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// | '---' |
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// | |
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// + +
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//
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// IN2 +---o--+------------+--o---+ OUT2
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// loop2 relays
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//
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// The 'loop1' gpio pin controlls two relays, which are either in loop
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// position, meaning that input and output are directly connected, or
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// they are in mixer position, meaning that the signal is passed through
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// the 'Sum' mixer. Similarly for 'loop2'.
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//
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// In the above, the 'loop1' relays are inactive, thus feeding IN1 to the
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// mixer (if 'add' is active) and feeding the mixer output to OUT1. The
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// 'loop2' relays are active, short-cutting the TSE-850 from channel 2.
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// IN1, IN2, OUT1 and OUT2 are TSE-850 connectors and DAC is the PCB name
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// of the (filtered) output from the PCM5142 codec.
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#include <linux/clk.h>
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#include <linux/gpio.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/regulator/consumer.h>
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#include <sound/soc.h>
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#include <sound/pcm_params.h>
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struct tse850_priv {
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struct gpio_desc *add;
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struct gpio_desc *loop1;
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struct gpio_desc *loop2;
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struct regulator *ana;
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int add_cache;
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int loop1_cache;
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int loop2_cache;
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};
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static int tse850_get_mux1(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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ucontrol->value.enumerated.item[0] = tse850->loop1_cache;
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return 0;
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}
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static int tse850_put_mux1(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
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unsigned int val = ucontrol->value.enumerated.item[0];
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if (val >= e->items)
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return -EINVAL;
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gpiod_set_value_cansleep(tse850->loop1, val);
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tse850->loop1_cache = val;
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return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
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}
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static int tse850_get_mux2(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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ucontrol->value.enumerated.item[0] = tse850->loop2_cache;
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return 0;
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}
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static int tse850_put_mux2(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
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unsigned int val = ucontrol->value.enumerated.item[0];
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if (val >= e->items)
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return -EINVAL;
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gpiod_set_value_cansleep(tse850->loop2, val);
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tse850->loop2_cache = val;
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return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
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}
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int tse850_get_mix(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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ucontrol->value.enumerated.item[0] = tse850->add_cache;
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return 0;
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}
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int tse850_put_mix(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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int connect = !!ucontrol->value.integer.value[0];
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if (tse850->add_cache == connect)
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return 0;
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/*
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* Hmmm, this gpiod_set_value_cansleep call should probably happen
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* inside snd_soc_dapm_mixer_update_power in the loop.
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*/
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gpiod_set_value_cansleep(tse850->add, connect);
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tse850->add_cache = connect;
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snd_soc_dapm_mixer_update_power(dapm, kctrl, connect, NULL);
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return 1;
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}
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int tse850_get_ana(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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int ret;
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ret = regulator_get_voltage(tse850->ana);
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if (ret < 0)
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return ret;
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/*
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* Map regulator output values like so:
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* -11.5V to "Low" (enum 0)
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* 11.5V-12.5V to "12V" (enum 1)
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* 12.5V-13.5V to "13V" (enum 2)
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* ...
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* 18.5V-19.5V to "19V" (enum 8)
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* 19.5V- to "20V" (enum 9)
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*/
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if (ret < 11000000)
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ret = 11000000;
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else if (ret > 20000000)
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ret = 20000000;
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ret -= 11000000;
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ret = (ret + 500000) / 1000000;
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ucontrol->value.enumerated.item[0] = ret;
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return 0;
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}
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int tse850_put_ana(struct snd_kcontrol *kctrl,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_dapm_context *dapm = snd_soc_dapm_kcontrol_dapm(kctrl);
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struct snd_soc_card *card = dapm->card;
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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struct soc_enum *e = (struct soc_enum *)kctrl->private_value;
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unsigned int uV = ucontrol->value.enumerated.item[0];
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int ret;
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if (uV >= e->items)
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return -EINVAL;
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/*
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* Map enum zero (Low) to 2 volts on the regulator, do this since
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* the ana regulator is supplied by the system 12V voltage and
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* requesting anything below the system voltage causes the system
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* voltage to be passed through the regulator. Also, the ana
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* regulator induces noise when requesting voltages near the
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* system voltage. So, by mapping Low to 2V, that noise is
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* eliminated when all that is needed is 12V (the system voltage).
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*/
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if (uV)
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uV = 11000000 + (1000000 * uV);
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else
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uV = 2000000;
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ret = regulator_set_voltage(tse850->ana, uV, uV);
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if (ret < 0)
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return ret;
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return snd_soc_dapm_put_enum_double(kctrl, ucontrol);
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}
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static const char * const mux_text[] = { "Mixer", "Loop" };
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static const struct soc_enum mux_enum =
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SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(mux_text), mux_text);
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static const struct snd_kcontrol_new mux1 =
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SOC_DAPM_ENUM_EXT("MUX1", mux_enum, tse850_get_mux1, tse850_put_mux1);
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static const struct snd_kcontrol_new mux2 =
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SOC_DAPM_ENUM_EXT("MUX2", mux_enum, tse850_get_mux2, tse850_put_mux2);
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#define TSE850_DAPM_SINGLE_EXT(xname, reg, shift, max, invert, xget, xput) \
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{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
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.info = snd_soc_info_volsw, \
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.get = xget, \
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.put = xput, \
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.private_value = SOC_SINGLE_VALUE(reg, shift, max, invert, 0) }
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static const struct snd_kcontrol_new mix[] = {
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TSE850_DAPM_SINGLE_EXT("IN Switch", SND_SOC_NOPM, 0, 1, 0,
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tse850_get_mix, tse850_put_mix),
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};
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static const char * const ana_text[] = {
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"Low", "12V", "13V", "14V", "15V", "16V", "17V", "18V", "19V", "20V"
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};
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static const struct soc_enum ana_enum =
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SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(ana_text), ana_text);
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static const struct snd_kcontrol_new out =
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SOC_DAPM_ENUM_EXT("ANA", ana_enum, tse850_get_ana, tse850_put_ana);
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static const struct snd_soc_dapm_widget tse850_dapm_widgets[] = {
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SND_SOC_DAPM_LINE("OUT1", NULL),
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SND_SOC_DAPM_LINE("OUT2", NULL),
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SND_SOC_DAPM_LINE("IN1", NULL),
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SND_SOC_DAPM_LINE("IN2", NULL),
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SND_SOC_DAPM_INPUT("DAC"),
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SND_SOC_DAPM_AIF_IN("AIFINL", "Playback", 0, SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_AIF_IN("AIFINR", "Playback", 1, SND_SOC_NOPM, 0, 0),
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SOC_MIXER_ARRAY("MIX", SND_SOC_NOPM, 0, 0, mix),
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SND_SOC_DAPM_MUX("MUX1", SND_SOC_NOPM, 0, 0, &mux1),
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SND_SOC_DAPM_MUX("MUX2", SND_SOC_NOPM, 0, 0, &mux2),
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SND_SOC_DAPM_OUT_DRV("OUT", SND_SOC_NOPM, 0, 0, &out, 1),
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};
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/*
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* These connections are not entirely correct, since both IN1 and IN2
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* are always fed to MIX (if the "IN switch" is set so), i.e. without
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* regard to the loop1 and loop2 relays that according to this only
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* control MUX1 and MUX2 but in fact also control how the input signals
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* are routed.
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* But, 1) I don't know how to do it right, and 2) it doesn't seem to
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* matter in practice since nothing is powered in those sections anyway.
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*/
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static const struct snd_soc_dapm_route tse850_intercon[] = {
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{ "OUT1", NULL, "MUX1" },
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{ "OUT2", NULL, "MUX2" },
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{ "MUX1", "Loop", "IN1" },
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{ "MUX1", "Mixer", "OUT" },
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{ "MUX2", "Loop", "IN2" },
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{ "MUX2", "Mixer", "OUT" },
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{ "OUT", NULL, "MIX" },
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{ "MIX", NULL, "DAC" },
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{ "MIX", "IN Switch", "IN1" },
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{ "MIX", "IN Switch", "IN2" },
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/* connect board input to the codec left channel output pin */
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{ "DAC", NULL, "OUTL" },
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};
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static struct snd_soc_dai_link tse850_dailink = {
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.name = "TSE-850",
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.stream_name = "TSE-850-PCM",
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.codec_dai_name = "pcm512x-hifi",
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.dai_fmt = SND_SOC_DAIFMT_I2S
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| SND_SOC_DAIFMT_NB_NF
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| SND_SOC_DAIFMT_CBM_CFS,
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};
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static struct snd_soc_card tse850_card = {
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.name = "TSE-850-ASoC",
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.owner = THIS_MODULE,
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.dai_link = &tse850_dailink,
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.num_links = 1,
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.dapm_widgets = tse850_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(tse850_dapm_widgets),
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.dapm_routes = tse850_intercon,
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.num_dapm_routes = ARRAY_SIZE(tse850_intercon),
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.fully_routed = true,
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};
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static int tse850_dt_init(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *codec_np, *cpu_np;
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struct snd_soc_dai_link *dailink = &tse850_dailink;
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if (!np) {
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dev_err(&pdev->dev, "only device tree supported\n");
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return -EINVAL;
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}
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cpu_np = of_parse_phandle(np, "axentia,cpu-dai", 0);
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if (!cpu_np) {
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dev_err(&pdev->dev, "failed to get cpu dai\n");
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return -EINVAL;
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}
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dailink->cpu_of_node = cpu_np;
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dailink->platform_of_node = cpu_np;
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of_node_put(cpu_np);
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codec_np = of_parse_phandle(np, "axentia,audio-codec", 0);
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if (!codec_np) {
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dev_err(&pdev->dev, "failed to get codec info\n");
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return -EINVAL;
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}
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dailink->codec_of_node = codec_np;
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of_node_put(codec_np);
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return 0;
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}
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static int tse850_probe(struct platform_device *pdev)
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{
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struct snd_soc_card *card = &tse850_card;
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struct device *dev = card->dev = &pdev->dev;
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struct tse850_priv *tse850;
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int ret;
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tse850 = devm_kzalloc(dev, sizeof(*tse850), GFP_KERNEL);
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if (!tse850)
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return -ENOMEM;
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snd_soc_card_set_drvdata(card, tse850);
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ret = tse850_dt_init(pdev);
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if (ret) {
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dev_err(dev, "failed to init dt info\n");
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return ret;
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}
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tse850->add = devm_gpiod_get(dev, "axentia,add", GPIOD_OUT_HIGH);
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if (IS_ERR(tse850->add)) {
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if (PTR_ERR(tse850->add) != -EPROBE_DEFER)
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dev_err(dev, "failed to get 'add' gpio\n");
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return PTR_ERR(tse850->add);
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}
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tse850->add_cache = 1;
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tse850->loop1 = devm_gpiod_get(dev, "axentia,loop1", GPIOD_OUT_HIGH);
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if (IS_ERR(tse850->loop1)) {
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if (PTR_ERR(tse850->loop1) != -EPROBE_DEFER)
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dev_err(dev, "failed to get 'loop1' gpio\n");
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return PTR_ERR(tse850->loop1);
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}
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tse850->loop1_cache = 1;
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tse850->loop2 = devm_gpiod_get(dev, "axentia,loop2", GPIOD_OUT_HIGH);
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if (IS_ERR(tse850->loop2)) {
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if (PTR_ERR(tse850->loop2) != -EPROBE_DEFER)
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dev_err(dev, "failed to get 'loop2' gpio\n");
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return PTR_ERR(tse850->loop2);
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}
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tse850->loop2_cache = 1;
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tse850->ana = devm_regulator_get(dev, "axentia,ana");
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if (IS_ERR(tse850->ana)) {
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if (PTR_ERR(tse850->ana) != -EPROBE_DEFER)
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dev_err(dev, "failed to get 'ana' regulator\n");
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return PTR_ERR(tse850->ana);
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}
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ret = regulator_enable(tse850->ana);
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if (ret < 0) {
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dev_err(dev, "failed to enable the 'ana' regulator\n");
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return ret;
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}
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ret = snd_soc_register_card(card);
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if (ret) {
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dev_err(dev, "snd_soc_register_card failed\n");
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goto err_disable_ana;
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}
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return 0;
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err_disable_ana:
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regulator_disable(tse850->ana);
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return ret;
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}
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static int tse850_remove(struct platform_device *pdev)
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{
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struct snd_soc_card *card = platform_get_drvdata(pdev);
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struct tse850_priv *tse850 = snd_soc_card_get_drvdata(card);
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snd_soc_unregister_card(card);
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regulator_disable(tse850->ana);
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return 0;
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}
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static const struct of_device_id tse850_dt_ids[] = {
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{ .compatible = "axentia,tse850-pcm5142", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, tse850_dt_ids);
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static struct platform_driver tse850_driver = {
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.driver = {
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.name = "axentia-tse850-pcm5142",
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.of_match_table = of_match_ptr(tse850_dt_ids),
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},
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.probe = tse850_probe,
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.remove = tse850_remove,
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};
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module_platform_driver(tse850_driver);
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/* Module information */
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MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
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MODULE_DESCRIPTION("ALSA SoC driver for TSE-850 with PCM5142 codec");
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MODULE_LICENSE("GPL v2");
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