/* * CS4271 ASoC codec driver * * Copyright (c) 2010 Alexander Sverdlin * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * This driver support CS4271 codec being master or slave, working * in control port mode, connected either via SPI or I2C. * The data format accepted is I2S or left-justified. * DAPM support not implemented. */ #include #include #include #include #include #include #include #include #include #include #include #include #define CS4271_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \ SNDRV_PCM_FMTBIT_S24_LE | \ SNDRV_PCM_FMTBIT_S32_LE) #define CS4271_PCM_RATES SNDRV_PCM_RATE_8000_192000 /* * CS4271 registers * High byte represents SPI chip address (0x10) + write command (0) * Low byte - codec register address */ #define CS4271_MODE1 0x2001 /* Mode Control 1 */ #define CS4271_DACCTL 0x2002 /* DAC Control */ #define CS4271_DACVOL 0x2003 /* DAC Volume & Mixing Control */ #define CS4271_VOLA 0x2004 /* DAC Channel A Volume Control */ #define CS4271_VOLB 0x2005 /* DAC Channel B Volume Control */ #define CS4271_ADCCTL 0x2006 /* ADC Control */ #define CS4271_MODE2 0x2007 /* Mode Control 2 */ #define CS4271_CHIPID 0x2008 /* Chip ID */ #define CS4271_FIRSTREG CS4271_MODE1 #define CS4271_LASTREG CS4271_MODE2 #define CS4271_NR_REGS ((CS4271_LASTREG & 0xFF) + 1) /* Bit masks for the CS4271 registers */ #define CS4271_MODE1_MODE_MASK 0xC0 #define CS4271_MODE1_MODE_1X 0x00 #define CS4271_MODE1_MODE_2X 0x80 #define CS4271_MODE1_MODE_4X 0xC0 #define CS4271_MODE1_DIV_MASK 0x30 #define CS4271_MODE1_DIV_1 0x00 #define CS4271_MODE1_DIV_15 0x10 #define CS4271_MODE1_DIV_2 0x20 #define CS4271_MODE1_DIV_3 0x30 #define CS4271_MODE1_MASTER 0x08 #define CS4271_MODE1_DAC_DIF_MASK 0x07 #define CS4271_MODE1_DAC_DIF_LJ 0x00 #define CS4271_MODE1_DAC_DIF_I2S 0x01 #define CS4271_MODE1_DAC_DIF_RJ16 0x02 #define CS4271_MODE1_DAC_DIF_RJ24 0x03 #define CS4271_MODE1_DAC_DIF_RJ20 0x04 #define CS4271_MODE1_DAC_DIF_RJ18 0x05 #define CS4271_DACCTL_AMUTE 0x80 #define CS4271_DACCTL_IF_SLOW 0x40 #define CS4271_DACCTL_DEM_MASK 0x30 #define CS4271_DACCTL_DEM_DIS 0x00 #define CS4271_DACCTL_DEM_441 0x10 #define CS4271_DACCTL_DEM_48 0x20 #define CS4271_DACCTL_DEM_32 0x30 #define CS4271_DACCTL_SVRU 0x08 #define CS4271_DACCTL_SRD 0x04 #define CS4271_DACCTL_INVA 0x02 #define CS4271_DACCTL_INVB 0x01 #define CS4271_DACVOL_BEQUA 0x40 #define CS4271_DACVOL_SOFT 0x20 #define CS4271_DACVOL_ZEROC 0x10 #define CS4271_DACVOL_ATAPI_MASK 0x0F #define CS4271_DACVOL_ATAPI_M_M 0x00 #define CS4271_DACVOL_ATAPI_M_BR 0x01 #define CS4271_DACVOL_ATAPI_M_BL 0x02 #define CS4271_DACVOL_ATAPI_M_BLR2 0x03 #define CS4271_DACVOL_ATAPI_AR_M 0x04 #define CS4271_DACVOL_ATAPI_AR_BR 0x05 #define CS4271_DACVOL_ATAPI_AR_BL 0x06 #define CS4271_DACVOL_ATAPI_AR_BLR2 0x07 #define CS4271_DACVOL_ATAPI_AL_M 0x08 #define CS4271_DACVOL_ATAPI_AL_BR 0x09 #define CS4271_DACVOL_ATAPI_AL_BL 0x0A #define CS4271_DACVOL_ATAPI_AL_BLR2 0x0B #define CS4271_DACVOL_ATAPI_ALR2_M 0x0C #define CS4271_DACVOL_ATAPI_ALR2_BR 0x0D #define CS4271_DACVOL_ATAPI_ALR2_BL 0x0E #define CS4271_DACVOL_ATAPI_ALR2_BLR2 0x0F #define CS4271_VOLA_MUTE 0x80 #define CS4271_VOLA_VOL_MASK 0x7F #define CS4271_VOLB_MUTE 0x80 #define CS4271_VOLB_VOL_MASK 0x7F #define CS4271_ADCCTL_DITHER16 0x20 #define CS4271_ADCCTL_ADC_DIF_MASK 0x10 #define CS4271_ADCCTL_ADC_DIF_LJ 0x00 #define CS4271_ADCCTL_ADC_DIF_I2S 0x10 #define CS4271_ADCCTL_MUTEA 0x08 #define CS4271_ADCCTL_MUTEB 0x04 #define CS4271_ADCCTL_HPFDA 0x02 #define CS4271_ADCCTL_HPFDB 0x01 #define CS4271_MODE2_LOOP 0x10 #define CS4271_MODE2_MUTECAEQUB 0x08 #define CS4271_MODE2_FREEZE 0x04 #define CS4271_MODE2_CPEN 0x02 #define CS4271_MODE2_PDN 0x01 #define CS4271_CHIPID_PART_MASK 0xF0 #define CS4271_CHIPID_REV_MASK 0x0F /* * Default CS4271 power-up configuration * Array contains non-existing in hw register at address 0 * Array do not include Chip ID, as codec driver does not use * registers read operations at all */ static const u8 cs4271_dflt_reg[CS4271_NR_REGS] = { 0, 0, CS4271_DACCTL_AMUTE, CS4271_DACVOL_SOFT | CS4271_DACVOL_ATAPI_AL_BR, 0, 0, 0, 0, }; struct cs4271_private { /* SND_SOC_I2C or SND_SOC_SPI */ enum snd_soc_control_type bus_type; unsigned int mclk; bool master; bool deemph; /* Current sample rate for de-emphasis control */ int rate; /* GPIO driving Reset pin, if any */ int gpio_nreset; /* GPIO that disable serial bus, if any */ int gpio_disable; }; /* * @freq is the desired MCLK rate * MCLK rate should (c) be the sample rate, multiplied by one of the * ratios listed in cs4271_mclk_fs_ratios table */ static int cs4271_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id, unsigned int freq, int dir) { struct snd_soc_codec *codec = codec_dai->codec; struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); cs4271->mclk = freq; return 0; } static int cs4271_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int format) { struct snd_soc_codec *codec = codec_dai->codec; struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); unsigned int val = 0; int ret; switch (format & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBS_CFS: cs4271->master = 0; break; case SND_SOC_DAIFMT_CBM_CFM: cs4271->master = 1; val |= CS4271_MODE1_MASTER; break; default: dev_err(codec->dev, "Invalid DAI format\n"); return -EINVAL; } switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_LEFT_J: val |= CS4271_MODE1_DAC_DIF_LJ; ret = snd_soc_update_bits(codec, CS4271_ADCCTL, CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_LJ); if (ret < 0) return ret; break; case SND_SOC_DAIFMT_I2S: val |= CS4271_MODE1_DAC_DIF_I2S; ret = snd_soc_update_bits(codec, CS4271_ADCCTL, CS4271_ADCCTL_ADC_DIF_MASK, CS4271_ADCCTL_ADC_DIF_I2S); if (ret < 0) return ret; break; default: dev_err(codec->dev, "Invalid DAI format\n"); return -EINVAL; } ret = snd_soc_update_bits(codec, CS4271_MODE1, CS4271_MODE1_DAC_DIF_MASK | CS4271_MODE1_MASTER, val); if (ret < 0) return ret; return 0; } static int cs4271_deemph[] = {0, 44100, 48000, 32000}; static int cs4271_set_deemph(struct snd_soc_codec *codec) { struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); int i, ret; int val = CS4271_DACCTL_DEM_DIS; if (cs4271->deemph) { /* Find closest de-emphasis freq */ val = 1; for (i = 2; i < ARRAY_SIZE(cs4271_deemph); i++) if (abs(cs4271_deemph[i] - cs4271->rate) < abs(cs4271_deemph[val] - cs4271->rate)) val = i; val <<= 4; } ret = snd_soc_update_bits(codec, CS4271_DACCTL, CS4271_DACCTL_DEM_MASK, val); if (ret < 0) return ret; return 0; } static int cs4271_get_deemph(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol); struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); ucontrol->value.enumerated.item[0] = cs4271->deemph; return 0; } static int cs4271_put_deemph(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol); struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); cs4271->deemph = ucontrol->value.enumerated.item[0]; return cs4271_set_deemph(codec); } struct cs4271_clk_cfg { bool master; /* codec mode */ u8 speed_mode; /* codec speed mode: 1x, 2x, 4x */ unsigned short ratio; /* MCLK / sample rate */ u8 ratio_mask; /* ratio bit mask for Master mode */ }; static struct cs4271_clk_cfg cs4271_clk_tab[] = { {1, CS4271_MODE1_MODE_1X, 256, CS4271_MODE1_DIV_1}, {1, CS4271_MODE1_MODE_1X, 384, CS4271_MODE1_DIV_15}, {1, CS4271_MODE1_MODE_1X, 512, CS4271_MODE1_DIV_2}, {1, CS4271_MODE1_MODE_1X, 768, CS4271_MODE1_DIV_3}, {1, CS4271_MODE1_MODE_2X, 128, CS4271_MODE1_DIV_1}, {1, CS4271_MODE1_MODE_2X, 192, CS4271_MODE1_DIV_15}, {1, CS4271_MODE1_MODE_2X, 256, CS4271_MODE1_DIV_2}, {1, CS4271_MODE1_MODE_2X, 384, CS4271_MODE1_DIV_3}, {1, CS4271_MODE1_MODE_4X, 64, CS4271_MODE1_DIV_1}, {1, CS4271_MODE1_MODE_4X, 96, CS4271_MODE1_DIV_15}, {1, CS4271_MODE1_MODE_4X, 128, CS4271_MODE1_DIV_2}, {1, CS4271_MODE1_MODE_4X, 192, CS4271_MODE1_DIV_3}, {0, CS4271_MODE1_MODE_1X, 256, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_1X, 384, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_1X, 512, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_1X, 768, CS4271_MODE1_DIV_2}, {0, CS4271_MODE1_MODE_1X, 1024, CS4271_MODE1_DIV_2}, {0, CS4271_MODE1_MODE_2X, 128, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_2X, 192, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_2X, 256, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_2X, 384, CS4271_MODE1_DIV_2}, {0, CS4271_MODE1_MODE_2X, 512, CS4271_MODE1_DIV_2}, {0, CS4271_MODE1_MODE_4X, 64, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_4X, 96, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_4X, 128, CS4271_MODE1_DIV_1}, {0, CS4271_MODE1_MODE_4X, 192, CS4271_MODE1_DIV_2}, {0, CS4271_MODE1_MODE_4X, 256, CS4271_MODE1_DIV_2}, }; #define CS4171_NR_RATIOS ARRAY_SIZE(cs4271_clk_tab) static int cs4271_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct snd_soc_codec *codec = dai->codec; struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); int i, ret; unsigned int ratio, val; cs4271->rate = params_rate(params); /* Configure DAC */ if (cs4271->rate < 50000) val = CS4271_MODE1_MODE_1X; else if (cs4271->rate < 100000) val = CS4271_MODE1_MODE_2X; else val = CS4271_MODE1_MODE_4X; ratio = cs4271->mclk / cs4271->rate; for (i = 0; i < CS4171_NR_RATIOS; i++) if ((cs4271_clk_tab[i].master == cs4271->master) && (cs4271_clk_tab[i].speed_mode == val) && (cs4271_clk_tab[i].ratio == ratio)) break; if (i == CS4171_NR_RATIOS) { dev_err(codec->dev, "Invalid sample rate\n"); return -EINVAL; } val |= cs4271_clk_tab[i].ratio_mask; ret = snd_soc_update_bits(codec, CS4271_MODE1, CS4271_MODE1_MODE_MASK | CS4271_MODE1_DIV_MASK, val); if (ret < 0) return ret; return cs4271_set_deemph(codec); } static int cs4271_digital_mute(struct snd_soc_dai *dai, int mute) { struct snd_soc_codec *codec = dai->codec; int ret; int val_a = 0; int val_b = 0; if (mute) { val_a = CS4271_VOLA_MUTE; val_b = CS4271_VOLB_MUTE; } ret = snd_soc_update_bits(codec, CS4271_VOLA, CS4271_VOLA_MUTE, val_a); if (ret < 0) return ret; ret = snd_soc_update_bits(codec, CS4271_VOLB, CS4271_VOLB_MUTE, val_b); if (ret < 0) return ret; return 0; } /* CS4271 controls */ static DECLARE_TLV_DB_SCALE(cs4271_dac_tlv, -12700, 100, 0); static const struct snd_kcontrol_new cs4271_snd_controls[] = { SOC_DOUBLE_R_TLV("Master Playback Volume", CS4271_VOLA, CS4271_VOLB, 0, 0x7F, 1, cs4271_dac_tlv), SOC_SINGLE("Digital Loopback Switch", CS4271_MODE2, 4, 1, 0), SOC_SINGLE("Soft Ramp Switch", CS4271_DACVOL, 5, 1, 0), SOC_SINGLE("Zero Cross Switch", CS4271_DACVOL, 4, 1, 0), SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0, cs4271_get_deemph, cs4271_put_deemph), SOC_SINGLE("Auto-Mute Switch", CS4271_DACCTL, 7, 1, 0), SOC_SINGLE("Slow Roll Off Filter Switch", CS4271_DACCTL, 6, 1, 0), SOC_SINGLE("Soft Volume Ramp-Up Switch", CS4271_DACCTL, 3, 1, 0), SOC_SINGLE("Soft Ramp-Down Switch", CS4271_DACCTL, 2, 1, 0), SOC_SINGLE("Left Channel Inversion Switch", CS4271_DACCTL, 1, 1, 0), SOC_SINGLE("Right Channel Inversion Switch", CS4271_DACCTL, 0, 1, 0), SOC_DOUBLE("Master Capture Switch", CS4271_ADCCTL, 3, 2, 1, 1), SOC_SINGLE("Dither 16-Bit Data Switch", CS4271_ADCCTL, 5, 1, 0), SOC_DOUBLE("High Pass Filter Switch", CS4271_ADCCTL, 1, 0, 1, 1), SOC_DOUBLE_R("Master Playback Switch", CS4271_VOLA, CS4271_VOLB, 7, 1, 1), }; static const struct snd_soc_dai_ops cs4271_dai_ops = { .hw_params = cs4271_hw_params, .set_sysclk = cs4271_set_dai_sysclk, .set_fmt = cs4271_set_dai_fmt, .digital_mute = cs4271_digital_mute, }; static struct snd_soc_dai_driver cs4271_dai = { .name = "cs4271-hifi", .playback = { .stream_name = "Playback", .channels_min = 2, .channels_max = 2, .rates = CS4271_PCM_RATES, .formats = CS4271_PCM_FORMATS, }, .capture = { .stream_name = "Capture", .channels_min = 2, .channels_max = 2, .rates = CS4271_PCM_RATES, .formats = CS4271_PCM_FORMATS, }, .ops = &cs4271_dai_ops, .symmetric_rates = 1, }; #ifdef CONFIG_PM static int cs4271_soc_suspend(struct snd_soc_codec *codec) { int ret; /* Set power-down bit */ ret = snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN, CS4271_MODE2_PDN); if (ret < 0) return ret; return 0; } static int cs4271_soc_resume(struct snd_soc_codec *codec) { int ret; /* Restore codec state */ ret = snd_soc_cache_sync(codec); if (ret < 0) return ret; /* then disable the power-down bit */ ret = snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN, 0); if (ret < 0) return ret; return 0; } #else #define cs4271_soc_suspend NULL #define cs4271_soc_resume NULL #endif /* CONFIG_PM */ #ifdef CONFIG_OF static const struct of_device_id cs4271_dt_ids[] = { { .compatible = "cirrus,cs4271", }, { } }; MODULE_DEVICE_TABLE(of, cs4271_dt_ids); #endif static int cs4271_probe(struct snd_soc_codec *codec) { struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); struct cs4271_platform_data *cs4271plat = codec->dev->platform_data; int ret; int gpio_nreset = -EINVAL; #ifdef CONFIG_OF if (of_match_device(cs4271_dt_ids, codec->dev)) gpio_nreset = of_get_named_gpio(codec->dev->of_node, "reset-gpio", 0); #endif if (cs4271plat && gpio_is_valid(cs4271plat->gpio_nreset)) gpio_nreset = cs4271plat->gpio_nreset; if (gpio_nreset >= 0) if (devm_gpio_request(codec->dev, gpio_nreset, "CS4271 Reset")) gpio_nreset = -EINVAL; if (gpio_nreset >= 0) { /* Reset codec */ gpio_direction_output(gpio_nreset, 0); udelay(1); gpio_set_value(gpio_nreset, 1); /* Give the codec time to wake up */ udelay(1); } cs4271->gpio_nreset = gpio_nreset; /* * In case of I2C, chip address specified in board data. * So cache IO operations use 8 bit codec register address. * In case of SPI, chip address and register address * passed together as 16 bit value. * Anyway, register address is masked with 0xFF inside * soc-cache code. */ if (cs4271->bus_type == SND_SOC_SPI) ret = snd_soc_codec_set_cache_io(codec, 16, 8, cs4271->bus_type); else ret = snd_soc_codec_set_cache_io(codec, 8, 8, cs4271->bus_type); if (ret) { dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret); return ret; } ret = snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN | CS4271_MODE2_CPEN, CS4271_MODE2_PDN | CS4271_MODE2_CPEN); if (ret < 0) return ret; ret = snd_soc_update_bits(codec, CS4271_MODE2, CS4271_MODE2_PDN, 0); if (ret < 0) return ret; /* Power-up sequence requires 85 uS */ udelay(85); return snd_soc_add_codec_controls(codec, cs4271_snd_controls, ARRAY_SIZE(cs4271_snd_controls)); } static int cs4271_remove(struct snd_soc_codec *codec) { struct cs4271_private *cs4271 = snd_soc_codec_get_drvdata(codec); if (gpio_is_valid(cs4271->gpio_nreset)) /* Set codec to the reset state */ gpio_set_value(cs4271->gpio_nreset, 0); return 0; }; static struct snd_soc_codec_driver soc_codec_dev_cs4271 = { .probe = cs4271_probe, .remove = cs4271_remove, .suspend = cs4271_soc_suspend, .resume = cs4271_soc_resume, .reg_cache_default = cs4271_dflt_reg, .reg_cache_size = ARRAY_SIZE(cs4271_dflt_reg), .reg_word_size = sizeof(cs4271_dflt_reg[0]), .compress_type = SND_SOC_FLAT_COMPRESSION, }; #if defined(CONFIG_SPI_MASTER) static int __devinit cs4271_spi_probe(struct spi_device *spi) { struct cs4271_private *cs4271; cs4271 = devm_kzalloc(&spi->dev, sizeof(*cs4271), GFP_KERNEL); if (!cs4271) return -ENOMEM; spi_set_drvdata(spi, cs4271); cs4271->bus_type = SND_SOC_SPI; return snd_soc_register_codec(&spi->dev, &soc_codec_dev_cs4271, &cs4271_dai, 1); } static int __devexit cs4271_spi_remove(struct spi_device *spi) { snd_soc_unregister_codec(&spi->dev); return 0; } static struct spi_driver cs4271_spi_driver = { .driver = { .name = "cs4271", .owner = THIS_MODULE, .of_match_table = of_match_ptr(cs4271_dt_ids), }, .probe = cs4271_spi_probe, .remove = __devexit_p(cs4271_spi_remove), }; #endif /* defined(CONFIG_SPI_MASTER) */ #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) static const struct i2c_device_id cs4271_i2c_id[] = { {"cs4271", 0}, {} }; MODULE_DEVICE_TABLE(i2c, cs4271_i2c_id); static int __devinit cs4271_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct cs4271_private *cs4271; cs4271 = devm_kzalloc(&client->dev, sizeof(*cs4271), GFP_KERNEL); if (!cs4271) return -ENOMEM; i2c_set_clientdata(client, cs4271); cs4271->bus_type = SND_SOC_I2C; return snd_soc_register_codec(&client->dev, &soc_codec_dev_cs4271, &cs4271_dai, 1); } static int __devexit cs4271_i2c_remove(struct i2c_client *client) { snd_soc_unregister_codec(&client->dev); return 0; } static struct i2c_driver cs4271_i2c_driver = { .driver = { .name = "cs4271", .owner = THIS_MODULE, .of_match_table = of_match_ptr(cs4271_dt_ids), }, .id_table = cs4271_i2c_id, .probe = cs4271_i2c_probe, .remove = __devexit_p(cs4271_i2c_remove), }; #endif /* defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) */ /* * We only register our serial bus driver here without * assignment to particular chip. So if any of the below * fails, there is some problem with I2C or SPI subsystem. * In most cases this module will be compiled with support * of only one serial bus. */ static int __init cs4271_modinit(void) { int ret; #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) ret = i2c_add_driver(&cs4271_i2c_driver); if (ret) { pr_err("Failed to register CS4271 I2C driver: %d\n", ret); return ret; } #endif #if defined(CONFIG_SPI_MASTER) ret = spi_register_driver(&cs4271_spi_driver); if (ret) { pr_err("Failed to register CS4271 SPI driver: %d\n", ret); return ret; } #endif return 0; } module_init(cs4271_modinit); static void __exit cs4271_modexit(void) { #if defined(CONFIG_SPI_MASTER) spi_unregister_driver(&cs4271_spi_driver); #endif #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) i2c_del_driver(&cs4271_i2c_driver); #endif } module_exit(cs4271_modexit); MODULE_AUTHOR("Alexander Sverdlin "); MODULE_DESCRIPTION("Cirrus Logic CS4271 ALSA SoC Codec Driver"); MODULE_LICENSE("GPL");