1 files changed, 501 insertions, 0 deletions

diff --git a/sound/soc/codecs/cx20442.c b/sound/soc/codecs/cx20442.c
new file mode 100644
index 000000000000..38eac9c866e1
--- /dev/null
+++ b/sound/soc/codecs/cx20442.c
@@ -0,0 +1,501 @@
+/*
+ * 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 <sound/core.h>
+#include <sound/initval.h>
+#include <sound/soc-dapm.h>
+
+#include "cx20442.h"
+
+
+struct cx20442_priv {
+        struct snd_soc_codec codec;
+        u8 reg_cache[1];
+};
+
+#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 int cx20442_add_widgets(struct snd_soc_codec *codec)
+{
+        snd_soc_dapm_new_controls(codec, cx20442_dapm_widgets,
+                                  ARRAY_SIZE(cx20442_dapm_widgets));
+
+        snd_soc_dapm_add_routes(codec, cx20442_audio_map,
+                                ARRAY_SIZE(cx20442_audio_map));
+
+        snd_soc_dapm_new_widgets(codec);
+        return 0;
+}
+
+static unsigned int cx20442_read_reg_cache(struct snd_soc_codec *codec,
+                                                        unsigned int reg)
+{
+        u8 *reg_cache = codec->reg_cache;
+
+        if (reg >= codec->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)
+{
+        u8 *reg_cache = codec->reg_cache;
+        int vls, vsp, old, len;
+        char buf[18];
+
+        if (reg >= codec->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 || !codec->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(codec->control_data, buf, len) != len)
+                return -EIO;
+
+        return 0;
+}
+
+
+/* Moved up here as line discipline referres it during initialization */
+static struct snd_soc_codec *cx20442_codec;
+
+
+/*
+ * 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)
+{
+        struct snd_soc_codec *codec = cx20442_codec;
+        int ret, len = strlen(v253_init);
+
+        /* Doesn't make sense without write callback */
+        if (!tty->ops->write)
+                return -EINVAL;
+
+        /* Pass the codec structure address for use by other ldisc callbacks */
+        tty->disc_data = codec;
+
+        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;
+
+        tty->disc_data = NULL;
+
+        if (!codec)
+                return;
+
+        /* Prevent the codec driver from further accessing the modem */
+        codec->hw_write = NULL;
+        codec->control_data = NULL;
+        codec->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;
+
+        if (!codec)
+                return;
+
+        if (!codec->control_data) {
+                /* First modem response, complete setup procedure */
+
+                /* Set up codec driver access to modem controls */
+                codec->control_data = tty;
+                codec->hw_write = (hw_write_t)tty->ops->write;
+                codec->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
+ */
+
+struct snd_soc_dai cx20442_dai = {
+        .name = "CX20442",
+        .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,
+        },
+};
+EXPORT_SYMBOL_GPL(cx20442_dai);
+
+static int cx20442_codec_probe(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec;
+        int ret;
+
+        if (!cx20442_codec) {
+                dev_err(&pdev->dev, "cx20442 not yet discovered\n");
+                return -ENODEV;
+        }
+        codec = cx20442_codec;
+
+        socdev->card->codec = codec;
+
+        /* register pcms */
+        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to create pcms\n");
+                goto pcm_err;
+        }
+
+        cx20442_add_widgets(codec);
+
+        ret = snd_soc_init_card(socdev);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "failed to register card\n");
+                goto card_err;
+        }
+
+        return ret;
+
+card_err:
+        snd_soc_free_pcms(socdev);
+        snd_soc_dapm_free(socdev);
+pcm_err:
+        return ret;
+}
+
+/* power down chip */
+static int cx20442_codec_remove(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+
+        snd_soc_free_pcms(socdev);
+        snd_soc_dapm_free(socdev);
+
+        return 0;
+}
+
+struct snd_soc_codec_device cx20442_codec_dev = {
+        .probe =        cx20442_codec_probe,
+        .remove =       cx20442_codec_remove,
+};
+EXPORT_SYMBOL_GPL(cx20442_codec_dev);
+
+static int cx20442_register(struct cx20442_priv *cx20442)
+{
+        struct snd_soc_codec *codec = &cx20442->codec;
+        int ret;
+
+        mutex_init(&codec->mutex);
+        INIT_LIST_HEAD(&codec->dapm_widgets);
+        INIT_LIST_HEAD(&codec->dapm_paths);
+
+        codec->name = "CX20442";
+        codec->owner = THIS_MODULE;
+        codec->private_data = cx20442;
+
+        codec->dai = &cx20442_dai;
+        codec->num_dai = 1;
+
+        codec->reg_cache = &cx20442->reg_cache;
+        codec->reg_cache_size = ARRAY_SIZE(cx20442->reg_cache);
+        codec->read = cx20442_read_reg_cache;
+        codec->write = cx20442_write;
+
+        codec->bias_level = SND_SOC_BIAS_OFF;
+
+        cx20442_dai.dev = codec->dev;
+
+        cx20442_codec = codec;
+
+        ret = snd_soc_register_codec(codec);
+        if (ret != 0) {
+                dev_err(codec->dev, "Failed to register codec: %d\n", ret);
+                goto err;
+        }
+
+        ret = snd_soc_register_dai(&cx20442_dai);
+        if (ret != 0) {
+                dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
+                goto err_codec;
+        }
+
+        return 0;
+
+err_codec:
+        snd_soc_unregister_codec(codec);
+err:
+        cx20442_codec = NULL;
+        kfree(cx20442);
+        return ret;
+}
+
+static void cx20442_unregister(struct cx20442_priv *cx20442)
+{
+        snd_soc_unregister_dai(&cx20442_dai);
+        snd_soc_unregister_codec(&cx20442->codec);
+
+        cx20442_codec = NULL;
+        kfree(cx20442);
+}
+
+static int cx20442_platform_probe(struct platform_device *pdev)
+{
+        struct cx20442_priv *cx20442;
+        struct snd_soc_codec *codec;
+
+        cx20442 = kzalloc(sizeof(struct cx20442_priv), GFP_KERNEL);
+        if (cx20442 == NULL)
+                return -ENOMEM;
+
+        codec = &cx20442->codec;
+
+        codec->control_data = NULL;
+        codec->hw_write = NULL;
+        codec->pop_time = 0;
+
+        codec->dev = &pdev->dev;
+        platform_set_drvdata(pdev, cx20442);
+
+        return cx20442_register(cx20442);
+}
+
+static int __exit cx20442_platform_remove(struct platform_device *pdev)
+{
+        struct cx20442_priv *cx20442 = platform_get_drvdata(pdev);
+
+        cx20442_unregister(cx20442);
+        return 0;
+}
+
+static struct platform_driver cx20442_platform_driver = {
+        .driver = {
+                .name = "cx20442",
+                .owner = THIS_MODULE,
+                },
+        .probe = cx20442_platform_probe,
+        .remove = __exit_p(cx20442_platform_remove),
+};
+
+static int __init cx20442_init(void)
+{
+        return platform_driver_register(&cx20442_platform_driver);
+}
+module_init(cx20442_init);
+
+static void __exit cx20442_exit(void)
+{
+        platform_driver_unregister(&cx20442_platform_driver);
+}
+module_exit(cx20442_exit);
+
+MODULE_DESCRIPTION("ASoC CX20442-11 voice modem codec driver");
+MODULE_AUTHOR("Janusz Krzysztofik");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:cx20442");