/* * AK4104 ALSA SoC (ASoC) driver * * Copyright (c) 2009 Daniel Mack * * 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 #include #include #include #include #include #include /* 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-codec" struct ak4104_private { enum snd_soc_control_type control_type; void *control_data; }; 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->driver->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->driver->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->driver->reg_cache_size) return -EINVAL; /* only write to the hardware if value has changed */ if (cache[reg] != value) { u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, 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_codec *codec = rtd->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); } static struct snd_soc_dai_ops ak4101_dai_ops = { .hw_params = ak4104_hw_params, .set_fmt = ak4104_set_dai_fmt, }; static struct snd_soc_dai_driver ak4104_dai = { .name = "ak4104-hifi", .playback = { .stream_name = "Playback", .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_8000_192000, .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE }, .ops = &ak4101_dai_ops, }; static int ak4104_probe(struct snd_soc_codec *codec) { struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec); int ret, val; codec->control_data = ak4104->control_data; /* read all regs and fill the cache */ ret = ak4104_fill_cache(codec); if (ret < 0) { dev_err(codec->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) return -ENODEV; /* 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) return ret; /* 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) return ret; dev_info(codec->dev, "SPI device initialized\n"); return 0; } static int ak4104_remove(struct snd_soc_codec *codec) { int val, ret; val = ak4104_read_reg_cache(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(codec, AK4104_REG_CONTROL1, val); return ret; } static struct snd_soc_codec_driver soc_codec_device_ak4104 = { .probe = ak4104_probe, .remove = ak4104_remove, .reg_cache_size = AK4104_NUM_REGS, .reg_word_size = sizeof(u16), }; static int ak4104_spi_probe(struct spi_device *spi) { struct ak4104_private *ak4104; int ret; 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 == NULL) return -ENOMEM; ak4104->control_data = spi; ak4104->control_type = SND_SOC_SPI; spi_set_drvdata(spi, ak4104); ret = snd_soc_register_codec(&spi->dev, &soc_codec_device_ak4104, &ak4104_dai, 1); if (ret < 0) kfree(ak4104); return ret; } static int __devexit ak4104_spi_remove(struct spi_device *spi) { snd_soc_unregister_codec(&spi->dev); kfree(spi_get_drvdata(spi)); return 0; } 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) { 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 "); MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver"); MODULE_LICENSE("GPL");