| /* |
| * 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> |
| * |
| * 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. |
| */ |
| |
| #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; |
| }; |
| |
| #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"}, |
| }; |
| |
| 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, |
| }; |
| |
| #if 0 |
| /* FIXME : these function will be re-used */ |
| 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_codec *codec, unsigned int reg, |
| unsigned int value) |
| { |
| struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); |
| u8 *reg_cache = codec->reg_cache; |
| int vls, vsp, old, len; |
| char buf[18]; |
| |
| if (reg >= codec->driver->reg_cache_size) |
| 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 = reg_cache[reg]; |
| reg_cache[reg] = 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(codec->dev, "%s: %s\n", __func__, buf); |
| if (cx20442->tty->ops->write(cx20442->tty, buf, len) != len) |
| return -EIO; |
| |
| return 0; |
| } |
| #endif |
| |
| /* |
| * 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_codec *codec = tty->disc_data; |
| struct cx20442_priv *cx20442; |
| |
| tty->disc_data = NULL; |
| |
| if (!codec) |
| return; |
| |
| cx20442 = snd_soc_codec_get_drvdata(codec); |
| |
| /* Prevent the codec driver from further accessing the modem */ |
| cx20442->tty = NULL; |
| codec->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_codec *codec = tty->disc_data; |
| struct cx20442_priv *cx20442; |
| |
| if (!codec) |
| return; |
| |
| cx20442 = snd_soc_codec_get_drvdata(codec); |
| |
| if (!cx20442->tty) { |
| /* First modem response, complete setup procedure */ |
| |
| /* Set up codec driver access to modem controls */ |
| cx20442->tty = tty; |
| codec->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_codec *codec, |
| enum snd_soc_bias_level level) |
| { |
| struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); |
| int err = 0; |
| |
| switch (level) { |
| case SND_SOC_BIAS_PREPARE: |
| if (snd_soc_codec_get_bias_level(codec) != 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_codec_get_bias_level(codec) != 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_codec_probe(struct snd_soc_codec *codec) |
| { |
| struct cx20442_priv *cx20442; |
| |
| cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL); |
| if (cx20442 == NULL) |
| return -ENOMEM; |
| |
| cx20442->por = regulator_get(codec->dev, "POR"); |
| if (IS_ERR(cx20442->por)) |
| dev_warn(codec->dev, "failed to get the regulator"); |
| cx20442->tty = NULL; |
| |
| snd_soc_codec_set_drvdata(codec, cx20442); |
| codec->component.card->pop_time = 0; |
| |
| return 0; |
| } |
| |
| /* power down chip */ |
| static int cx20442_codec_remove(struct snd_soc_codec *codec) |
| { |
| struct cx20442_priv *cx20442 = snd_soc_codec_get_drvdata(codec); |
| |
| 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_codec_set_drvdata(codec, NULL); |
| kfree(cx20442); |
| return 0; |
| } |
| |
| static const u8 cx20442_reg; |
| |
| static const struct snd_soc_codec_driver cx20442_codec_dev = { |
| .probe = cx20442_codec_probe, |
| .remove = cx20442_codec_remove, |
| .set_bias_level = cx20442_set_bias_level, |
| |
| .component_driver = { |
| .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), |
| }, |
| }; |
| |
| static int cx20442_platform_probe(struct platform_device *pdev) |
| { |
| return snd_soc_register_codec(&pdev->dev, |
| &cx20442_codec_dev, &cx20442_dai, 1); |
| } |
| |
| static int cx20442_platform_remove(struct platform_device *pdev) |
| { |
| snd_soc_unregister_codec(&pdev->dev); |
| return 0; |
| } |
| |
| static struct platform_driver cx20442_platform_driver = { |
| .driver = { |
| .name = "cx20442-codec", |
| }, |
| .probe = cx20442_platform_probe, |
| .remove = cx20442_platform_remove, |
| }; |
| |
| 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"); |