ASoC: Add ak4642/ak4643 codec support

This is very simple driver for ALSA
It supprt headphone output and stereo input only
This patch is tested by ms7724se

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 502 insertions, 0 deletions

diff --git a/sound/soc/codecs/ak4642.c b/sound/soc/codecs/ak4642.c
new file mode 100644
index 000000000000..e057c7b578df
--- /dev/null
+++ b/sound/soc/codecs/ak4642.c
@@ -0,0 +1,502 @@
+/*
+ * ak4642.c  --  AK4642/AK4643 ALSA Soc Audio driver
+ *
+ * Copyright (C) 2009 Renesas Solutions Corp.
+ * Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ *
+ * Based on wm8731.c by Richard Purdie
+ * Based on ak4535.c by Richard Purdie
+ * Based on wm8753.c by Liam Girdwood
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* ** CAUTION **
+ *
+ * This is very simple driver.
+ * It can use headphone output / stereo input only
+ *
+ * AK4642 is not tested.
+ * AK4643 is tested.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/i2c.h>
+#include <linux/platform_device.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <sound/initval.h>
+
+#include "ak4642.h"
+
+#define AK4642_VERSION "0.0.1"
+
+#define PW_MGMT1        0x00
+#define PW_MGMT2        0x01
+#define SG_SL1          0x02
+#define SG_SL2          0x03
+#define MD_CTL1         0x04
+#define MD_CTL2         0x05
+#define TIMER           0x06
+#define ALC_CTL1        0x07
+#define ALC_CTL2        0x08
+#define L_IVC           0x09
+#define L_DVC           0x0a
+#define ALC_CTL3        0x0b
+#define R_IVC           0x0c
+#define R_DVC           0x0d
+#define MD_CTL3         0x0e
+#define MD_CTL4         0x0f
+#define PW_MGMT3        0x10
+#define DF_S            0x11
+#define FIL3_0          0x12
+#define FIL3_1          0x13
+#define FIL3_2          0x14
+#define FIL3_3          0x15
+#define EQ_0            0x16
+#define EQ_1            0x17
+#define EQ_2            0x18
+#define EQ_3            0x19
+#define EQ_4            0x1a
+#define EQ_5            0x1b
+#define FIL1_0          0x1c
+#define FIL1_1          0x1d
+#define FIL1_2          0x1e
+#define FIL1_3          0x1f
+#define PW_MGMT4        0x20
+#define MD_CTL5         0x21
+#define LO_MS           0x22
+#define HP_MS           0x23
+#define SPK_MS          0x24
+
+#define AK4642_CACHEREGNUM      0x25
+
+struct snd_soc_codec_device soc_codec_dev_ak4642;
+
+/* codec private data */
+struct ak4642_priv {
+        struct snd_soc_codec codec;
+        unsigned int sysclk;
+};
+
+static struct snd_soc_codec *ak4642_codec;
+
+/*
+ * ak4642 register cache
+ */
+static const u16 ak4642_reg[AK4642_CACHEREGNUM] = {
+        0x0000, 0x0000, 0x0001, 0x0000,
+        0x0002, 0x0000, 0x0000, 0x0000,
+        0x00e1, 0x00e1, 0x0018, 0x0000,
+        0x00e1, 0x0018, 0x0011, 0x0008,
+        0x0000, 0x0000, 0x0000, 0x0000,
+        0x0000, 0x0000, 0x0000, 0x0000,
+        0x0000, 0x0000, 0x0000, 0x0000,
+        0x0000, 0x0000, 0x0000, 0x0000,
+        0x0000, 0x0000, 0x0000, 0x0000,
+        0x0000,
+};
+
+/*
+ * read ak4642 register cache
+ */
+static inline unsigned int ak4642_read_reg_cache(struct snd_soc_codec *codec,
+        unsigned int reg)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg >= AK4642_CACHEREGNUM)
+                return -1;
+        return cache[reg];
+}
+
+/*
+ * write ak4642 register cache
+ */
+static inline void ak4642_write_reg_cache(struct snd_soc_codec *codec,
+        u16 reg, unsigned int value)
+{
+        u16 *cache = codec->reg_cache;
+        if (reg >= AK4642_CACHEREGNUM)
+                return;
+
+        cache[reg] = value;
+}
+
+/*
+ * write to the AK4642 register space
+ */
+static int ak4642_write(struct snd_soc_codec *codec, unsigned int reg,
+        unsigned int value)
+{
+        u8 data[2];
+
+        /* data is
+         *   D15..D8 AK4642 register offset
+         *   D7...D0 register data
+         */
+        data[0] = reg & 0xff;
+        data[1] = value & 0xff;
+
+        if (codec->hw_write(codec->control_data, data, 2) == 2) {
+                ak4642_write_reg_cache(codec, reg, value);
+                return 0;
+        } else
+                return -EIO;
+}
+
+static int ak4642_sync(struct snd_soc_codec *codec)
+{
+        u16 *cache = codec->reg_cache;
+        int i, r = 0;
+
+        for (i = 0; i < AK4642_CACHEREGNUM; i++)
+                r |= ak4642_write(codec, i, cache[i]);
+
+        return r;
+};
+
+static int ak4642_dai_startup(struct snd_pcm_substream *substream,
+                              struct snd_soc_dai *dai)
+{
+        int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+        struct snd_soc_codec *codec = dai->codec;
+
+        if (is_play) {
+                /*
+                 * start headphone output
+                 *
+                 * PLL, Master Mode
+                 * Audio I/F Format :MSB justified (ADC & DAC)
+                 * Sampling Frequency: 44.1kHz
+                 * Digital Volume: −8dB
+                 * Bass Boost Level : Middle
+                 *
+                 * This operation came from example code of
+                 * "ASAHI KASEI AK4642" (japanese) manual p97.
+                 *
+                 * Example code use 0x39, 0x79 value for 0x01 address,
+                 * But we need MCKO (0x02) bit now
+                 */
+                ak4642_write(codec, 0x05, 0x27);
+                ak4642_write(codec, 0x0f, 0x09);
+                ak4642_write(codec, 0x0e, 0x19);
+                ak4642_write(codec, 0x09, 0x91);
+                ak4642_write(codec, 0x0c, 0x91);
+                ak4642_write(codec, 0x0a, 0x28);
+                ak4642_write(codec, 0x0d, 0x28);
+                ak4642_write(codec, 0x00, 0x64);
+                ak4642_write(codec, 0x01, 0x3b); /* + MCKO bit */
+                ak4642_write(codec, 0x01, 0x7b); /* + MCKO bit */
+        } else {
+                /*
+                 * start stereo input
+                 *
+                 * PLL Master Mode
+                 * Audio I/F Format:MSB justified (ADC & DAC)
+                 * Sampling Frequency:44.1kHz
+                 * Pre MIC AMP:+20dB
+                 * MIC Power On
+                 * ALC setting:Refer to Table 35
+                 * ALC bit=“1”
+                 *
+                 * This operation came from example code of
+                 * "ASAHI KASEI AK4642" (japanese) manual p94.
+                 */
+                ak4642_write(codec, 0x05, 0x27);
+                ak4642_write(codec, 0x02, 0x05);
+                ak4642_write(codec, 0x06, 0x3c);
+                ak4642_write(codec, 0x08, 0xe1);
+                ak4642_write(codec, 0x0b, 0x00);
+                ak4642_write(codec, 0x07, 0x21);
+                ak4642_write(codec, 0x00, 0x41);
+                ak4642_write(codec, 0x10, 0x01);
+        }
+
+        return 0;
+}
+
+static void ak4642_dai_shutdown(struct snd_pcm_substream *substream,
+                               struct snd_soc_dai *dai)
+{
+        int is_play = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+        struct snd_soc_codec *codec = dai->codec;
+
+        if (is_play) {
+                /* stop headphone output */
+                ak4642_write(codec, 0x01, 0x3b);
+                ak4642_write(codec, 0x01, 0x0b);
+                ak4642_write(codec, 0x00, 0x40);
+                ak4642_write(codec, 0x0e, 0x11);
+                ak4642_write(codec, 0x0f, 0x08);
+        } else {
+                /* stop stereo input */
+                ak4642_write(codec, 0x00, 0x40);
+                ak4642_write(codec, 0x10, 0x00);
+                ak4642_write(codec, 0x07, 0x01);
+        }
+}
+
+static int ak4642_dai_set_sysclk(struct snd_soc_dai *codec_dai,
+        int clk_id, unsigned int freq, int dir)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        struct ak4642_priv *ak4642 = codec->private_data;
+
+        ak4642->sysclk = freq;
+        return 0;
+}
+
+static struct snd_soc_dai_ops ak4642_dai_ops = {
+        .startup        = ak4642_dai_startup,
+        .shutdown       = ak4642_dai_shutdown,
+        .set_sysclk     = ak4642_dai_set_sysclk,
+};
+
+struct snd_soc_dai ak4642_dai = {
+        .name = "AK4642",
+        .playback = {
+                .stream_name = "Playback",
+                .channels_min = 1,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_8000_48000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE },
+        .capture = {
+                .stream_name = "Capture",
+                .channels_min = 1,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_8000_48000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE },
+        .ops = &ak4642_dai_ops,
+};
+EXPORT_SYMBOL_GPL(ak4642_dai);
+
+static int ak4642_resume(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        struct snd_soc_codec *codec = socdev->card->codec;
+
+        ak4642_sync(codec);
+        return 0;
+}
+
+/*
+ * initialise the AK4642 driver
+ * register the mixer and dsp interfaces with the kernel
+ */
+static int ak4642_init(struct ak4642_priv *ak4642)
+{
+        struct snd_soc_codec *codec = &ak4642->codec;
+        int ret = 0;
+
+        if (ak4642_codec) {
+                dev_err(codec->dev, "Another ak4642 is registered\n");
+                return -EINVAL;
+        }
+
+        mutex_init(&codec->mutex);
+        INIT_LIST_HEAD(&codec->dapm_widgets);
+        INIT_LIST_HEAD(&codec->dapm_paths);
+
+        codec->private_data     = ak4642;
+        codec->name             = "AK4642";
+        codec->owner            = THIS_MODULE;
+        codec->read             = ak4642_read_reg_cache;
+        codec->write            = ak4642_write;
+        codec->dai              = &ak4642_dai;
+        codec->num_dai          = 1;
+        codec->hw_write         = (hw_write_t)i2c_master_send;
+        codec->reg_cache_size   = ARRAY_SIZE(ak4642_reg);
+        codec->reg_cache        = kmemdup(ak4642_reg,
+                                          sizeof(ak4642_reg), GFP_KERNEL);
+
+        if (!codec->reg_cache)
+                return -ENOMEM;
+
+        ak4642_dai.dev = codec->dev;
+        ak4642_codec = codec;
+
+        ret = snd_soc_register_codec(codec);
+        if (ret) {
+                dev_err(codec->dev, "Failed to register codec: %d\n", ret);
+                goto reg_cache_err;
+        }
+
+        ret = snd_soc_register_dai(&ak4642_dai);
+        if (ret) {
+                dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
+                snd_soc_unregister_codec(codec);
+                goto reg_cache_err;
+        }
+
+        /*
+         * clock setting
+         *
+         * Audio I/F Format: MSB justified (ADC & DAC)
+         * BICK frequency at Master Mode: 64fs
+         * Input Master Clock Select at PLL Mode: 11.2896MHz
+         * MCKO: Enable
+         * Sampling Frequency: 44.1kHz
+         *
+         * This operation came from example code of
+         * "ASAHI KASEI AK4642" (japanese) manual p89.
+         *
+         * please fix-me
+         */
+        ak4642_write(codec, 0x01, 0x08);
+        ak4642_write(codec, 0x04, 0x4a);
+        ak4642_write(codec, 0x05, 0x27);
+        ak4642_write(codec, 0x00, 0x40);
+        ak4642_write(codec, 0x01, 0x0b);
+
+        return ret;
+
+reg_cache_err:
+        kfree(codec->reg_cache);
+        codec->reg_cache = NULL;
+
+        return ret;
+}
+
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+static int ak4642_i2c_probe(struct i2c_client *i2c,
+                            const struct i2c_device_id *id)
+{
+        struct ak4642_priv *ak4642;
+        struct snd_soc_codec *codec;
+        int ret;
+
+        ak4642 = kzalloc(sizeof(struct ak4642_priv), GFP_KERNEL);
+        if (!ak4642)
+                return -ENOMEM;
+
+        codec = &ak4642->codec;
+        codec->dev = &i2c->dev;
+
+        i2c_set_clientdata(i2c, ak4642);
+        codec->control_data = i2c;
+
+        ret = ak4642_init(ak4642);
+        if (ret < 0)
+                printk(KERN_ERR "failed to initialise AK4642\n");
+
+        return ret;
+}
+
+static int ak4642_i2c_remove(struct i2c_client *client)
+{
+        struct ak4642_priv *ak4642 = i2c_get_clientdata(client);
+
+        snd_soc_unregister_dai(&ak4642_dai);
+        snd_soc_unregister_codec(&ak4642->codec);
+        kfree(ak4642->codec.reg_cache);
+        kfree(ak4642);
+        ak4642_codec = NULL;
+
+        return 0;
+}
+
+static const struct i2c_device_id ak4642_i2c_id[] = {
+        { "ak4642", 0 },
+        { "ak4643", 0 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, ak4642_i2c_id);
+
+static struct i2c_driver ak4642_i2c_driver = {
+        .driver = {
+                .name = "AK4642 I2C Codec",
+                .owner = THIS_MODULE,
+        },
+        .probe          = ak4642_i2c_probe,
+        .remove         = ak4642_i2c_remove,
+        .id_table       = ak4642_i2c_id,
+};
+
+#endif
+
+static int ak4642_probe(struct platform_device *pdev)
+{
+        struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+        int ret;
+
+        if (!ak4642_codec) {
+                dev_err(&pdev->dev, "Codec device not registered\n");
+                return -ENODEV;
+        }
+
+        socdev->card->codec = ak4642_codec;
+
+        /* register pcms */
+        ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+        if (ret < 0) {
+                printk(KERN_ERR "ak4642: failed to create pcms\n");
+                goto pcm_err;
+        }
+
+        ret = snd_soc_init_card(socdev);
+        if (ret < 0) {
+                printk(KERN_ERR "ak4642: failed to register card\n");
+                goto card_err;
+        }
+
+        dev_info(&pdev->dev, "AK4642 Audio Codec %s", AK4642_VERSION);
+        return ret;
+
+card_err:
+        snd_soc_free_pcms(socdev);
+        snd_soc_dapm_free(socdev);
+pcm_err:
+        return ret;
+
+}
+
+/* power down chip */
+static int ak4642_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 soc_codec_dev_ak4642 = {
+        .probe =        ak4642_probe,
+        .remove =       ak4642_remove,
+        .resume =       ak4642_resume,
+};
+EXPORT_SYMBOL_GPL(soc_codec_dev_ak4642);
+
+static int __init ak4642_modinit(void)
+{
+        int ret;
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+        ret = i2c_add_driver(&ak4642_i2c_driver);
+#endif
+        return ret;
+
+}
+module_init(ak4642_modinit);
+
+static void __exit ak4642_exit(void)
+{
+#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+        i2c_del_driver(&ak4642_i2c_driver);
+#endif
+
+}
+module_exit(ak4642_exit);
+
+MODULE_DESCRIPTION("Soc AK4642 driver");
+MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
+MODULE_LICENSE("GPL");