ASoC: Add a driver for AK4104 S/PDIF transmitter

This adds a driver for the SPI connected AK4104 S/PDIF transmitter
device. Its features are fairly simple, but as there is need to set up
certain bits in the IEC958 information, this better goes into a real
driver.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: Mark Brown <broonie@sirena.org.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 628a591c728fab0c9a3614ce101084beea7d892e..a1af311e7f06adfd59d5bf6fd1623b08916e70b1 100644 (file)
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -14,6 +14,7 @@ config SND_SOC_ALL_CODECS
        select SND_SOC_AC97_CODEC if SND_SOC_AC97_BUS
        select SND_SOC_AD1980 if SND_SOC_AC97_BUS
        select SND_SOC_AD73311 if I2C
+       select SND_SOC_AK4104 if SPI_MASTER
        select SND_SOC_AK4535 if I2C
        select SND_SOC_CS4270 if I2C
        select SND_SOC_PCM3008
@@ -60,6 +61,9 @@ config SND_SOC_AD1980
 config SND_SOC_AD73311
        tristate
 
+config SND_SOC_AK4104
+       tristate
+
 config SND_SOC_AK4535
        tristate
 

diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 3664cdc300b2d2e98d5f586dd4ac9896b116cb4a..4717c3c99040549361646395b6b48689e1687796 100644 (file)
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -1,6 +1,7 @@
 snd-soc-ac97-objs := ac97.o
 snd-soc-ad1980-objs := ad1980.o
 snd-soc-ad73311-objs := ad73311.o
+snd-soc-ak4104-objs := ak4104.o
 snd-soc-ak4535-objs := ak4535.o
 snd-soc-cs4270-objs := cs4270.o
 snd-soc-l3-objs := l3.o
@@ -30,6 +31,7 @@ snd-soc-wm9713-objs := wm9713.o
 obj-$(CONFIG_SND_SOC_AC97_CODEC)       += snd-soc-ac97.o
 obj-$(CONFIG_SND_SOC_AD1980)   += snd-soc-ad1980.o
 obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o
+obj-$(CONFIG_SND_SOC_AK4104)   += snd-soc-ak4104.o
 obj-$(CONFIG_SND_SOC_AK4535)   += snd-soc-ak4535.o
 obj-$(CONFIG_SND_SOC_CS4270)   += snd-soc-cs4270.o
 obj-$(CONFIG_SND_SOC_L3)       += snd-soc-l3.o

diff --git a/sound/soc/codecs/ak4104.c b/sound/soc/codecs/ak4104.c
new file mode 100644 (file)
index 0000000..338381f
--- /dev/null
+++ b/sound/soc/codecs/ak4104.c
@@ -0,0 +1,363 @@
+/*
+ * AK4104 ALSA SoC (ASoC) driver
+ *
+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ *  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/module.h>
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
+#include <linux/spi/spi.h>
+#include <sound/asoundef.h>
+
+#include "ak4104.h"
+
+/* AK4104 registers addresses */
+#define AK4104_REG_CONTROL1            0x00
+#define AK4104_REG_RESERVED            0x01
+#define AK4104_REG_CONTROL2            0x02
+#define AK4104_REG_TX                  0x03
+#define AK4104_REG_CHN_STATUS(x)       ((x) + 0x04)
+#define AK4104_NUM_REGS                        10
+
+#define AK4104_REG_MASK                        0x1f
+#define AK4104_READ                    0xc0
+#define AK4104_WRITE                   0xe0
+#define AK4104_RESERVED_VAL            0x5b
+
+/* Bit masks for AK4104 registers */
+#define AK4104_CONTROL1_RSTN           (1 << 0)
+#define AK4104_CONTROL1_PW             (1 << 1)
+#define AK4104_CONTROL1_DIF0           (1 << 2)
+#define AK4104_CONTROL1_DIF1           (1 << 3)
+
+#define AK4104_CONTROL2_SEL0           (1 << 0)
+#define AK4104_CONTROL2_SEL1           (1 << 1)
+#define AK4104_CONTROL2_MODE           (1 << 2)
+
+#define AK4104_TX_TXE                  (1 << 0)
+#define AK4104_TX_V                    (1 << 1)
+
+#define DRV_NAME "ak4104"
+
+struct ak4104_private {
+       struct snd_soc_codec codec;
+       u8 reg_cache[AK4104_NUM_REGS];
+};
+
+static int ak4104_fill_cache(struct snd_soc_codec *codec)
+{
+       int i;
+       u8 *reg_cache = codec->reg_cache;
+       struct spi_device *spi = codec->control_data;
+
+       for (i = 0; i < codec->reg_cache_size; i++) {
+               int ret = spi_w8r8(spi, i | AK4104_READ);
+               if (ret < 0) {
+                       dev_err(&spi->dev, "SPI write failure\n");
+                       return ret;
+               }
+
+               reg_cache[i] = ret;
+       }
+
+       return 0;
+}
+
+static unsigned int ak4104_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];
+}
+
+static int ak4104_spi_write(struct snd_soc_codec *codec, unsigned int reg,
+                           unsigned int value)
+{
+       u8 *cache = codec->reg_cache;
+       struct spi_device *spi = codec->control_data;
+
+       if (reg >= codec->reg_cache_size)
+               return -EINVAL;
+
+       reg &= AK4104_REG_MASK;
+       reg |= AK4104_WRITE;
+
+       /* only write to the hardware if value has changed */
+       if (cache[reg] != value) {
+               u8 tmp[2] = { reg, value };
+               if (spi_write(spi, tmp, sizeof(tmp))) {
+                       dev_err(&spi->dev, "SPI write failed\n");
+                       return -EIO;
+               }
+
+               cache[reg] = value;
+       }
+
+       return 0;
+}
+
+static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
+                             unsigned int format)
+{
+       struct snd_soc_codec *codec = codec_dai->codec;
+       int val = 0;
+
+       val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
+       if (val < 0)
+               return val;
+
+       val &= ~(AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1);
+
+       /* set DAI format */
+       switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
+       case SND_SOC_DAIFMT_RIGHT_J:
+               break;
+       case SND_SOC_DAIFMT_LEFT_J:
+               val |= AK4104_CONTROL1_DIF0;
+               break;
+       case SND_SOC_DAIFMT_I2S:
+               val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
+               break;
+       default:
+               dev_err(codec->dev, "invalid dai format\n");
+               return -EINVAL;
+       }
+
+       /* This device can only be slave */
+       if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
+               return -EINVAL;
+
+       return ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
+}
+
+static int ak4104_hw_params(struct snd_pcm_substream *substream,
+                           struct snd_pcm_hw_params *params,
+                           struct snd_soc_dai *dai)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct snd_soc_device *socdev = rtd->socdev;
+       struct snd_soc_codec *codec = socdev->card->codec;
+       int val = 0;
+
+       /* set the IEC958 bits: consumer mode, no copyright bit */
+       val |= IEC958_AES0_CON_NOT_COPYRIGHT;
+       ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(0), val);
+
+       val = 0;
+
+       switch (params_rate(params)) {
+       case 44100:
+               val |= IEC958_AES3_CON_FS_44100;
+               break;
+       case 48000:
+               val |= IEC958_AES3_CON_FS_48000;
+               break;
+       case 32000:
+               val |= IEC958_AES3_CON_FS_32000;
+               break;
+       default:
+               dev_err(codec->dev, "unsupported sampling rate\n");
+               return -EINVAL;
+       }
+
+       return ak4104_spi_write(codec, AK4104_REG_CHN_STATUS(3), val);
+}
+
+struct snd_soc_dai ak4104_dai = {
+       .name = DRV_NAME,
+       .playback = {
+               .stream_name = "Playback",
+               .channels_min = 2,
+               .channels_max = 2,
+               .rates = SNDRV_PCM_RATE_44100 |
+                        SNDRV_PCM_RATE_48000 |
+                        SNDRV_PCM_RATE_32000,
+               .formats = SNDRV_PCM_FMTBIT_S16_LE  |
+                          SNDRV_PCM_FMTBIT_S24_3LE |
+                          SNDRV_PCM_FMTBIT_S24_LE
+       },
+       .ops = {
+               .hw_params = ak4104_hw_params,
+               .set_fmt = ak4104_set_dai_fmt,
+       }
+};
+
+static struct snd_soc_codec *ak4104_codec;
+
+static int ak4104_spi_probe(struct spi_device *spi)
+{
+       struct snd_soc_codec *codec;
+       struct ak4104_private *ak4104;
+       int ret, val;
+
+       spi->bits_per_word = 8;
+       spi->mode = SPI_MODE_0;
+       ret = spi_setup(spi);
+       if (ret < 0)
+               return ret;
+
+       ak4104 = kzalloc(sizeof(struct ak4104_private), GFP_KERNEL);
+       if (!ak4104) {
+               dev_err(&spi->dev, "could not allocate codec\n");
+               return -ENOMEM;
+       }
+
+       codec = &ak4104->codec;
+       mutex_init(&codec->mutex);
+       INIT_LIST_HEAD(&codec->dapm_widgets);
+       INIT_LIST_HEAD(&codec->dapm_paths);
+
+       codec->dev = &spi->dev;
+       codec->name = DRV_NAME;
+       codec->owner = THIS_MODULE;
+       codec->dai = &ak4104_dai;
+       codec->num_dai = 1;
+       codec->private_data = ak4104;
+       codec->control_data = spi;
+       codec->reg_cache = ak4104->reg_cache;
+       codec->reg_cache_size = AK4104_NUM_REGS;
+
+       /* read all regs and fill the cache */
+       ret = ak4104_fill_cache(codec);
+       if (ret < 0) {
+               dev_err(&spi->dev, "failed to fill register cache\n");
+               return ret;
+       }
+
+       /* read the 'reserved' register - according to the datasheet, it
+        * should contain 0x5b. Not a good way to verify the presence of
+        * the device, but there is no hardware ID register. */
+       if (ak4104_read_reg_cache(codec, AK4104_REG_RESERVED) !=
+                                        AK4104_RESERVED_VAL) {
+               ret = -ENODEV;
+               goto error_free_codec;
+       }
+
+       /* set power-up and non-reset bits */
+       val = ak4104_read_reg_cache(codec, AK4104_REG_CONTROL1);
+       val |= AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN;
+       ret = ak4104_spi_write(codec, AK4104_REG_CONTROL1, val);
+       if (ret < 0)
+               goto error_free_codec;
+
+       /* enable transmitter */
+       val = ak4104_read_reg_cache(codec, AK4104_REG_TX);
+       val |= AK4104_TX_TXE;
+       ret = ak4104_spi_write(codec, AK4104_REG_TX, val);
+       if (ret < 0)
+               goto error_free_codec;
+
+       ak4104_codec = codec;
+       ret = snd_soc_register_dai(&ak4104_dai);
+       if (ret < 0) {
+               dev_err(&spi->dev, "failed to register DAI\n");
+               goto error_free_codec;
+       }
+
+       spi_set_drvdata(spi, ak4104);
+       dev_info(&spi->dev, "SPI device initialized\n");
+       return 0;
+
+error_free_codec:
+       kfree(ak4104);
+       ak4104_dai.dev = NULL;
+       return ret;
+}
+
+static int __devexit ak4104_spi_remove(struct spi_device *spi)
+{
+       int ret, val;
+       struct ak4104_private *ak4104 = spi_get_drvdata(spi);
+
+       val = ak4104_read_reg_cache(&ak4104->codec, AK4104_REG_CONTROL1);
+       if (val < 0)
+               return val;
+
+       /* clear power-up and non-reset bits */
+       val &= ~(AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
+       ret = ak4104_spi_write(&ak4104->codec, AK4104_REG_CONTROL1, val);
+       if (ret < 0)
+               return ret;
+
+       ak4104_codec = NULL;
+       kfree(ak4104);
+       return 0;
+}
+
+static int ak4104_probe(struct platform_device *pdev)
+{
+       struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+       struct snd_soc_codec *codec = ak4104_codec;
+       int ret;
+
+       /* Connect the codec to the socdev.  snd_soc_new_pcms() needs this. */
+       socdev->card->codec = codec;
+
+       /* Register PCMs */
+       ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+       if (ret < 0) {
+               dev_err(codec->dev, "failed to create pcms\n");
+               return ret;
+       }
+
+       /* Register the socdev */
+       ret = snd_soc_init_card(socdev);
+       if (ret < 0) {
+               dev_err(codec->dev, "failed to register card\n");
+               snd_soc_free_pcms(socdev);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int ak4104_remove(struct platform_device *pdev)
+{
+       struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+       snd_soc_free_pcms(socdev);
+       return 0;
+};
+
+struct snd_soc_codec_device soc_codec_device_ak4104 = {
+       .probe =        ak4104_probe,
+       .remove =       ak4104_remove
+};
+EXPORT_SYMBOL_GPL(soc_codec_device_ak4104);
+
+static struct spi_driver ak4104_spi_driver = {
+       .driver  = {
+               .name   = DRV_NAME,
+               .owner  = THIS_MODULE,
+       },
+       .probe  = ak4104_spi_probe,
+       .remove = __devexit_p(ak4104_spi_remove),
+};
+
+static int __init ak4104_init(void)
+{
+       pr_info("Asahi Kasei AK4104 ALSA SoC Codec Driver\n");
+       return spi_register_driver(&ak4104_spi_driver);
+}
+module_init(ak4104_init);
+
+static void __exit ak4104_exit(void)
+{
+       spi_unregister_driver(&ak4104_spi_driver);
+}
+module_exit(ak4104_exit);
+
+MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
+MODULE_LICENSE("GPL");
+

diff --git a/sound/soc/codecs/ak4104.h b/sound/soc/codecs/ak4104.h
new file mode 100644 (file)
index 0000000..eb88fe7
--- /dev/null
+++ b/sound/soc/codecs/ak4104.h
@@ -0,0 +1,7 @@
+#ifndef _AK4104_H
+#define _AK4104_H
+
+extern struct snd_soc_dai ak4104_dai;
+extern struct snd_soc_codec_device soc_codec_device_ak4104;
+
+#endif