diff options
Diffstat (limited to '')
-rw-r--r-- | sound/soc/codecs/cx20442.c | 434 |
1 files changed, 434 insertions, 0 deletions
diff --git a/sound/soc/codecs/cx20442.c b/sound/soc/codecs/cx20442.c new file mode 100644 index 0000000000..9d54141a0c --- /dev/null +++ b/sound/soc/codecs/cx20442.c @@ -0,0 +1,434 @@ +// 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 void v253_hangup(struct tty_struct *tty) +{ + v253_close(tty); +} + +/* Line discipline .receive_buf() */ +static void v253_receive(struct tty_struct *tty, const u8 *cp, const u8 *fp, + size_t 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; + } +} + +struct tty_ldisc_ops v253_ops = { + .name = "cx20442", + .owner = THIS_MODULE, + .open = v253_open, + .close = v253_close, + .hangup = v253_hangup, + .receive_buf = v253_receive, +}; +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, +}; + +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"); |