435 lines
10 KiB
C
435 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* cx20442.c -- CX20442 ALSA Soc Audio driver
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*
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* Copyright 2009 Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
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*
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* Initially based on sound/soc/codecs/wm8400.c
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* Copyright 2008, 2009 Wolfson Microelectronics PLC.
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*/
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#include <linux/tty.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include "cx20442.h"
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struct cx20442_priv {
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struct tty_struct *tty;
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struct regulator *por;
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u8 reg_cache;
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};
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#define CX20442_PM 0x0
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#define CX20442_TELIN 0
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#define CX20442_TELOUT 1
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#define CX20442_MIC 2
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#define CX20442_SPKOUT 3
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#define CX20442_AGC 4
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static const struct snd_soc_dapm_widget cx20442_dapm_widgets[] = {
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SND_SOC_DAPM_OUTPUT("TELOUT"),
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SND_SOC_DAPM_OUTPUT("SPKOUT"),
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SND_SOC_DAPM_OUTPUT("AGCOUT"),
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SND_SOC_DAPM_MIXER("SPKOUT Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
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SND_SOC_DAPM_PGA("TELOUT Amp", CX20442_PM, CX20442_TELOUT, 0, NULL, 0),
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SND_SOC_DAPM_PGA("SPKOUT Amp", CX20442_PM, CX20442_SPKOUT, 0, NULL, 0),
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SND_SOC_DAPM_PGA("SPKOUT AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
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SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
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SND_SOC_DAPM_MICBIAS("TELIN Bias", CX20442_PM, CX20442_TELIN, 0),
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SND_SOC_DAPM_MICBIAS("MIC Bias", CX20442_PM, CX20442_MIC, 0),
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SND_SOC_DAPM_PGA("MIC AGC", CX20442_PM, CX20442_AGC, 0, NULL, 0),
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SND_SOC_DAPM_INPUT("TELIN"),
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SND_SOC_DAPM_INPUT("MIC"),
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SND_SOC_DAPM_INPUT("AGCIN"),
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};
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static const struct snd_soc_dapm_route cx20442_audio_map[] = {
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{"TELOUT", NULL, "TELOUT Amp"},
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{"SPKOUT", NULL, "SPKOUT Mixer"},
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{"SPKOUT Mixer", NULL, "SPKOUT Amp"},
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{"TELOUT Amp", NULL, "DAC"},
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{"SPKOUT Amp", NULL, "DAC"},
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{"SPKOUT Mixer", NULL, "SPKOUT AGC"},
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{"SPKOUT AGC", NULL, "AGCIN"},
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{"AGCOUT", NULL, "MIC AGC"},
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{"MIC AGC", NULL, "MIC"},
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{"MIC Bias", NULL, "MIC"},
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{"Input Mixer", NULL, "MIC Bias"},
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{"TELIN Bias", NULL, "TELIN"},
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{"Input Mixer", NULL, "TELIN Bias"},
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{"ADC", NULL, "Input Mixer"},
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};
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static unsigned int cx20442_read_reg_cache(struct snd_soc_component *component,
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unsigned int reg)
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{
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
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if (reg >= 1)
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return -EINVAL;
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return cx20442->reg_cache;
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}
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enum v253_vls {
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V253_VLS_NONE = 0,
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V253_VLS_T,
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V253_VLS_L,
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V253_VLS_LT,
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V253_VLS_S,
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V253_VLS_ST,
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V253_VLS_M,
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V253_VLS_MST,
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V253_VLS_S1,
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V253_VLS_S1T,
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V253_VLS_MS1T,
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V253_VLS_M1,
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V253_VLS_M1ST,
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V253_VLS_M1S1T,
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V253_VLS_H,
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V253_VLS_HT,
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V253_VLS_MS,
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V253_VLS_MS1,
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V253_VLS_M1S,
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V253_VLS_M1S1,
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V253_VLS_TEST,
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};
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static int cx20442_pm_to_v253_vls(u8 value)
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{
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switch (value & ~(1 << CX20442_AGC)) {
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case 0:
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return V253_VLS_T;
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case (1 << CX20442_SPKOUT):
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case (1 << CX20442_MIC):
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case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
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return V253_VLS_M1S1;
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case (1 << CX20442_TELOUT):
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case (1 << CX20442_TELIN):
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case (1 << CX20442_TELOUT) | (1 << CX20442_TELIN):
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return V253_VLS_L;
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case (1 << CX20442_TELOUT) | (1 << CX20442_MIC):
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return V253_VLS_NONE;
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}
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return -EINVAL;
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}
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static int cx20442_pm_to_v253_vsp(u8 value)
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{
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switch (value & ~(1 << CX20442_AGC)) {
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case (1 << CX20442_SPKOUT):
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case (1 << CX20442_MIC):
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case (1 << CX20442_SPKOUT) | (1 << CX20442_MIC):
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return (bool)(value & (1 << CX20442_AGC));
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}
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return (value & (1 << CX20442_AGC)) ? -EINVAL : 0;
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}
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static int cx20442_write(struct snd_soc_component *component, unsigned int reg,
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unsigned int value)
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{
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
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int vls, vsp, old, len;
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char buf[18];
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if (reg >= 1)
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return -EINVAL;
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/* tty and write pointers required for talking to the modem
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* are expected to be set by the line discipline initialization code */
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if (!cx20442->tty || !cx20442->tty->ops->write)
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return -EIO;
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old = cx20442->reg_cache;
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cx20442->reg_cache = value;
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vls = cx20442_pm_to_v253_vls(value);
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if (vls < 0)
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return vls;
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vsp = cx20442_pm_to_v253_vsp(value);
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if (vsp < 0)
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return vsp;
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if ((vls == V253_VLS_T) ||
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(vls == cx20442_pm_to_v253_vls(old))) {
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if (vsp == cx20442_pm_to_v253_vsp(old))
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return 0;
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len = snprintf(buf, ARRAY_SIZE(buf), "at+vsp=%d\r", vsp);
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} else if (vsp == cx20442_pm_to_v253_vsp(old))
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len = snprintf(buf, ARRAY_SIZE(buf), "at+vls=%d\r", vls);
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else
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len = snprintf(buf, ARRAY_SIZE(buf),
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"at+vls=%d;+vsp=%d\r", vls, vsp);
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if (unlikely(len > (ARRAY_SIZE(buf) - 1)))
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return -ENOMEM;
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dev_dbg(component->dev, "%s: %s\n", __func__, buf);
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if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len)
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return -EIO;
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return 0;
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}
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/*
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* Line discpline related code
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*
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* Any of the callback functions below can be used in two ways:
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* 1) registerd by a machine driver as one of line discipline operations,
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* 2) called from a machine's provided line discipline callback function
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* in case when extra machine specific code must be run as well.
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*/
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/* Modem init: echo off, digital speaker off, quiet off, voice mode */
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static const char v253_init[] = "ate0m0q0+fclass=8\r";
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/* Line discipline .open() */
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static int v253_open(struct tty_struct *tty)
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{
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int ret, len = strlen(v253_init);
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/* Doesn't make sense without write callback */
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if (!tty->ops->write)
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return -EINVAL;
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/* Won't work if no codec pointer has been passed by a card driver */
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if (!tty->disc_data)
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return -ENODEV;
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tty->receive_room = 16;
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if (tty->ops->write(tty, v253_init, len) != len) {
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ret = -EIO;
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goto err;
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}
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/* Actual setup will be performed after the modem responds. */
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return 0;
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err:
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tty->disc_data = NULL;
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return ret;
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}
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/* Line discipline .close() */
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static void v253_close(struct tty_struct *tty)
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{
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struct snd_soc_component *component = tty->disc_data;
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struct cx20442_priv *cx20442;
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tty->disc_data = NULL;
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if (!component)
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return;
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cx20442 = snd_soc_component_get_drvdata(component);
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/* Prevent the codec driver from further accessing the modem */
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cx20442->tty = NULL;
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component->card->pop_time = 0;
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}
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/* Line discipline .hangup() */
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static void v253_hangup(struct tty_struct *tty)
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{
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v253_close(tty);
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}
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/* Line discipline .receive_buf() */
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static void v253_receive(struct tty_struct *tty, const unsigned char *cp,
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const char *fp, int count)
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{
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struct snd_soc_component *component = tty->disc_data;
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struct cx20442_priv *cx20442;
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if (!component)
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return;
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cx20442 = snd_soc_component_get_drvdata(component);
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if (!cx20442->tty) {
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/* First modem response, complete setup procedure */
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/* Set up codec driver access to modem controls */
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cx20442->tty = tty;
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component->card->pop_time = 1;
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}
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}
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struct tty_ldisc_ops v253_ops = {
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.name = "cx20442",
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.owner = THIS_MODULE,
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.open = v253_open,
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.close = v253_close,
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.hangup = v253_hangup,
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.receive_buf = v253_receive,
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};
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EXPORT_SYMBOL_GPL(v253_ops);
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/*
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* Codec DAI
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*/
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static struct snd_soc_dai_driver cx20442_dai = {
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.name = "cx20442-voice",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 1,
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.channels_max = 1,
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.rates = SNDRV_PCM_RATE_8000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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.capture = {
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.stream_name = "Capture",
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.channels_min = 1,
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.channels_max = 1,
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.rates = SNDRV_PCM_RATE_8000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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},
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};
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static int cx20442_set_bias_level(struct snd_soc_component *component,
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enum snd_soc_bias_level level)
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{
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
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int err = 0;
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switch (level) {
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case SND_SOC_BIAS_PREPARE:
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if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_STANDBY)
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break;
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if (IS_ERR(cx20442->por))
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err = PTR_ERR(cx20442->por);
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else
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err = regulator_enable(cx20442->por);
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break;
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case SND_SOC_BIAS_STANDBY:
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if (snd_soc_component_get_bias_level(component) != SND_SOC_BIAS_PREPARE)
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break;
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if (IS_ERR(cx20442->por))
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err = PTR_ERR(cx20442->por);
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else
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err = regulator_disable(cx20442->por);
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break;
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default:
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break;
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}
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return err;
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}
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static int cx20442_component_probe(struct snd_soc_component *component)
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{
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struct cx20442_priv *cx20442;
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cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
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if (cx20442 == NULL)
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return -ENOMEM;
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cx20442->por = regulator_get(component->dev, "POR");
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if (IS_ERR(cx20442->por)) {
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int err = PTR_ERR(cx20442->por);
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dev_warn(component->dev, "failed to get POR supply (%d)", err);
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/*
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* When running on a non-dt platform and requested regulator
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* is not available, regulator_get() never returns
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* -EPROBE_DEFER as it is not able to justify if the regulator
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* may still appear later. On the other hand, the board can
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* still set full constraints flag at late_initcall in order
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* to instruct regulator_get() to return a dummy one if
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* sufficient. Hence, if we get -ENODEV here, let's convert
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* it to -EPROBE_DEFER and wait for the board to decide or
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* let Deferred Probe infrastructure handle this error.
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*/
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if (err == -ENODEV)
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err = -EPROBE_DEFER;
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kfree(cx20442);
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return err;
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}
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cx20442->tty = NULL;
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snd_soc_component_set_drvdata(component, cx20442);
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component->card->pop_time = 0;
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return 0;
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}
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/* power down chip */
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static void cx20442_component_remove(struct snd_soc_component *component)
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{
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struct cx20442_priv *cx20442 = snd_soc_component_get_drvdata(component);
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if (cx20442->tty) {
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struct tty_struct *tty = cx20442->tty;
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tty_hangup(tty);
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}
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if (!IS_ERR(cx20442->por)) {
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/* should be already in STANDBY, hence disabled */
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regulator_put(cx20442->por);
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}
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snd_soc_component_set_drvdata(component, NULL);
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kfree(cx20442);
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}
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static const struct snd_soc_component_driver cx20442_component_dev = {
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.probe = cx20442_component_probe,
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.remove = cx20442_component_remove,
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.set_bias_level = cx20442_set_bias_level,
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.read = cx20442_read_reg_cache,
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.write = cx20442_write,
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.dapm_widgets = cx20442_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(cx20442_dapm_widgets),
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.dapm_routes = cx20442_audio_map,
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.num_dapm_routes = ARRAY_SIZE(cx20442_audio_map),
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.idle_bias_on = 1,
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.use_pmdown_time = 1,
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.endianness = 1,
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};
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static int cx20442_platform_probe(struct platform_device *pdev)
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{
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return devm_snd_soc_register_component(&pdev->dev,
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&cx20442_component_dev, &cx20442_dai, 1);
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}
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static struct platform_driver cx20442_platform_driver = {
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.driver = {
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.name = "cx20442-codec",
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},
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.probe = cx20442_platform_probe,
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};
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module_platform_driver(cx20442_platform_driver);
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MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
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MODULE_AUTHOR("Janusz Krzysztofik");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:cx20442-codec");
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