--- /dev/null
+/*
+ * 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");
+
projects / openwrt / staging / blogic.git / commitdiff