--- /dev/null
+/*
+ * 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 {
+ void *control_data;
+ 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"},
+};
+
+static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
+ unsigned int reg)
+{
+ u8 *reg_cache = codec->reg_cache;
+
+ if (reg >= codec->driver->reg_cache_size)
+ return -EINVAL;
+
+ return reg_cache[reg];
+}
+
+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_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;
+
+ /* hw_write and control_data pointers required for talking to the modem
+ * are expected to be set by the line discipline initialization code */
+ if (!codec->hw_write || !cx20442->control_data)
+ 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 (codec->hw_write(cx20442->control_data, 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;
+
+ 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 */
+ codec->hw_write = NULL;
+ cx20442->control_data = 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->control_data) {
+ /* First modem response, complete setup procedure */
+
+ /* Set up codec driver access to modem controls */
+ cx20442->control_data = tty;
+ codec->hw_write = (hw_write_t)tty->ops->write;
+ 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 (codec->dapm.bias_level != 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 (codec->dapm.bias_level != SND_SOC_BIAS_PREPARE)
+ break;
+ if (IS_ERR(cx20442->por))
+ err = PTR_ERR(cx20442->por);
+ else
+ err = regulator_disable(cx20442->por);
+ break;
+ default:
+ break;
+ }
+ if (!err)
+ codec->dapm.bias_level = level;
+
+ 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->control_data = NULL;
+
+ snd_soc_codec_set_drvdata(codec, cx20442);
+ codec->hw_write = NULL;
+ 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->control_data) {
+ struct tty_struct *tty = cx20442->control_data;
+ 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 struct snd_soc_codec_driver cx20442_codec_dev = {
+ .probe = cx20442_codec_probe,
+ .remove = cx20442_codec_remove,
+ .set_bias_level = cx20442_set_bias_level,
+ .reg_cache_default = &cx20442_reg,
+ .reg_cache_size = 1,
+ .reg_word_size = sizeof(u8),
+ .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),
+};
+
+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");
Code Review / kvmfornfv.git / blobdiff