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_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; }