/* * wm8731.c -- WM8731 ALSA SoC Audio driver * * Copyright 2005 Openedhand Ltd. * Copyright 2006-12 Wolfson Microelectronics, plc * * Author: Richard Purdie * * Based on wm8753.c by Liam Girdwood * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "wm8731.h" #define WM8731_NUM_SUPPLIES 4 static const char *wm8731_supply_names[WM8731_NUM_SUPPLIES] = { "AVDD", "HPVDD", "DCVDD", "DBVDD", }; /* codec private data */ struct wm8731_priv { struct regmap *regmap; struct regulator_bulk_data supplies[WM8731_NUM_SUPPLIES]; const struct snd_pcm_hw_constraint_list *constraints; unsigned int sysclk; int sysclk_type; int playback_fs; bool deemph; }; /* * wm8731 register cache */ static const struct reg_default wm8731_reg_defaults[] = { { 0, 0x0097 }, { 1, 0x0097 }, { 2, 0x0079 }, { 3, 0x0079 }, { 4, 0x000a }, { 5, 0x0008 }, { 6, 0x009f }, { 7, 0x000a }, { 8, 0x0000 }, { 9, 0x0000 }, }; static bool wm8731_volatile(struct device *dev, unsigned int reg) { return reg == WM8731_RESET; } static bool wm8731_writeable(struct device *dev, unsigned int reg) { return reg <= WM8731_RESET; } #define wm8731_reset(c) snd_soc_write(c, WM8731_RESET, 0) static const char *wm8731_input_select[] = {"Line In", "Mic"}; static SOC_ENUM_SINGLE_DECL(wm8731_insel_enum, WM8731_APANA, 2, wm8731_input_select); static int wm8731_deemph[] = { 0, 32000, 44100, 48000 }; static int wm8731_set_deemph(struct snd_soc_codec *codec) { struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); int val, i, best; /* If we're using deemphasis select the nearest available sample * rate. */ if (wm8731->deemph) { best = 1; for (i = 2; i < ARRAY_SIZE(wm8731_deemph); i++) { if (abs(wm8731_deemph[i] - wm8731->playback_fs) < abs(wm8731_deemph[best] - wm8731->playback_fs)) best = i; } val = best << 1; } else { best = 0; val = 0; } dev_dbg(codec->dev, "Set deemphasis %d (%dHz)\n", best, wm8731_deemph[best]); return snd_soc_update_bits(codec, WM8731_APDIGI, 0x6, val); } static int wm8731_get_deemph(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol); struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); ucontrol->value.integer.value[0] = wm8731->deemph; return 0; } static int wm8731_put_deemph(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) { struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol); struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); int deemph = ucontrol->value.integer.value[0]; int ret = 0; if (deemph > 1) return -EINVAL; mutex_lock(&codec->mutex); if (wm8731->deemph != deemph) { wm8731->deemph = deemph; wm8731_set_deemph(codec); ret = 1; } mutex_unlock(&codec->mutex); return ret; } static const DECLARE_TLV_DB_SCALE(in_tlv, -3450, 150, 0); static const DECLARE_TLV_DB_SCALE(sidetone_tlv, -1500, 300, 0); static const DECLARE_TLV_DB_SCALE(out_tlv, -12100, 100, 1); static const DECLARE_TLV_DB_SCALE(mic_tlv, 0, 2000, 0); static const struct snd_kcontrol_new wm8731_snd_controls[] = { SOC_DOUBLE_R_TLV("Master Playback Volume", WM8731_LOUT1V, WM8731_ROUT1V, 0, 127, 0, out_tlv), SOC_DOUBLE_R("Master Playback ZC Switch", WM8731_LOUT1V, WM8731_ROUT1V, 7, 1, 0), SOC_DOUBLE_R_TLV("Capture Volume", WM8731_LINVOL, WM8731_RINVOL, 0, 31, 0, in_tlv), SOC_DOUBLE_R("Line Capture Switch", WM8731_LINVOL, WM8731_RINVOL, 7, 1, 1), SOC_SINGLE_TLV("Mic Boost Volume", WM8731_APANA, 0, 1, 0, mic_tlv), SOC_SINGLE("Mic Capture Switch", WM8731_APANA, 1, 1, 1), SOC_SINGLE_TLV("Sidetone Playback Volume", WM8731_APANA, 6, 3, 1, sidetone_tlv), SOC_SINGLE("ADC High Pass Filter Switch", WM8731_APDIGI, 0, 1, 1), SOC_SINGLE("Store DC Offset Switch", WM8731_APDIGI, 4, 1, 0), SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0, wm8731_get_deemph, wm8731_put_deemph), }; /* Output Mixer */ static const struct snd_kcontrol_new wm8731_output_mixer_controls[] = { SOC_DAPM_SINGLE("Line Bypass Switch", WM8731_APANA, 3, 1, 0), SOC_DAPM_SINGLE("Mic Sidetone Switch", WM8731_APANA, 5, 1, 0), SOC_DAPM_SINGLE("HiFi Playback Switch", WM8731_APANA, 4, 1, 0), }; /* Input mux */ static const struct snd_kcontrol_new wm8731_input_mux_controls = SOC_DAPM_ENUM("Input Select", wm8731_insel_enum); static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = { SND_SOC_DAPM_SUPPLY("ACTIVE",WM8731_ACTIVE, 0, 0, NULL, 0), SND_SOC_DAPM_SUPPLY("OSC", WM8731_PWR, 5, 1, NULL, 0), SND_SOC_DAPM_MIXER("Output Mixer", WM8731_PWR, 4, 1, &wm8731_output_mixer_controls[0], ARRAY_SIZE(wm8731_output_mixer_controls)), SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8731_PWR, 3, 1), SND_SOC_DAPM_OUTPUT("LOUT"), SND_SOC_DAPM_OUTPUT("LHPOUT"), SND_SOC_DAPM_OUTPUT("ROUT"), SND_SOC_DAPM_OUTPUT("RHPOUT"), SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8731_PWR, 2, 1), SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0, &wm8731_input_mux_controls), SND_SOC_DAPM_PGA("Line Input", WM8731_PWR, 0, 1, NULL, 0), SND_SOC_DAPM_MICBIAS("Mic Bias", WM8731_PWR, 1, 1), SND_SOC_DAPM_INPUT("MICIN"), SND_SOC_DAPM_INPUT("RLINEIN"), SND_SOC_DAPM_INPUT("LLINEIN"), }; static int wm8731_check_osc(struct snd_soc_dapm_widget *source, struct snd_soc_dapm_widget *sink) { struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(source->codec); return wm8731->sysclk_type == WM8731_SYSCLK_XTAL; } static const struct snd_soc_dapm_route wm8731_intercon[] = { {"DAC", NULL, "OSC", wm8731_check_osc}, {"ADC", NULL, "OSC", wm8731_check_osc}, {"DAC", NULL, "ACTIVE"}, {"ADC", NULL, "ACTIVE"}, /* output mixer */ {"Output Mixer", "Line Bypass Switch", "Line Input"}, {"Output Mixer", "HiFi Playback Switch", "DAC"}, {"Output Mixer", "Mic Sidetone Switch", "Mic Bias"}, /* outputs */ {"RHPOUT", NULL, "Output Mixer"}, {"ROUT", NULL, "Output Mixer"}, {"LHPOUT", NULL, "Output Mixer"}, {"LOUT", NULL, "Output Mixer"}, /* input mux */ {"Input Mux", "Line In", "Line Input"}, {"Input Mux", "Mic", "Mic Bias"}, {"ADC", NULL, "Input Mux"}, /* inputs */ {"Line Input", NULL, "LLINEIN"}, {"Line Input", NULL, "RLINEIN"}, {"Mic Bias", NULL, "MICIN"}, }; struct _coeff_div { u32 mclk; u32 rate; u16 fs; u8 sr:4; u8 bosr:1; u8 usb:1; }; /* codec mclk clock divider coefficients */ static const struct _coeff_div coeff_div[] = { /* 48k */ {12288000, 48000, 256, 0x0, 0x0, 0x0}, {18432000, 48000, 384, 0x0, 0x1, 0x0}, {12000000, 48000, 250, 0x0, 0x0, 0x1}, /* 32k */ {12288000, 32000, 384, 0x6, 0x0, 0x0}, {18432000, 32000, 576, 0x6, 0x1, 0x0}, {12000000, 32000, 375, 0x6, 0x0, 0x1}, /* 8k */ {12288000, 8000, 1536, 0x3, 0x0, 0x0}, {18432000, 8000, 2304, 0x3, 0x1, 0x0}, {11289600, 8000, 1408, 0xb, 0x0, 0x0}, {16934400, 8000, 2112, 0xb, 0x1, 0x0}, {12000000, 8000, 1500, 0x3, 0x0, 0x1}, /* 96k */ {12288000, 96000, 128, 0x7, 0x0, 0x0}, {18432000, 96000, 192, 0x7, 0x1, 0x0}, {12000000, 96000, 125, 0x7, 0x0, 0x1}, /* 44.1k */ {11289600, 44100, 256, 0x8, 0x0, 0x0}, {16934400, 44100, 384, 0x8, 0x1, 0x0}, {12000000, 44100, 272, 0x8, 0x1, 0x1}, /* 88.2k */ {11289600, 88200, 128, 0xf, 0x0, 0x0}, {16934400, 88200, 192, 0xf, 0x1, 0x0}, {12000000, 88200, 136, 0xf, 0x1, 0x1}, }; /* rates constraints */ static const unsigned int wm8731_rates_12000000[] = { 8000, 32000, 44100, 48000, 96000, 88200, }; static const unsigned int wm8731_rates_12288000_18432000[] = { 8000, 32000, 48000, 96000, }; static const unsigned int wm8731_rates_11289600_16934400[] = { 8000, 44100, 88200, }; static const struct snd_pcm_hw_constraint_list wm8731_constraints_12000000 = { .list = wm8731_rates_12000000, .count = ARRAY_SIZE(wm8731_rates_12000000), }; static const struct snd_pcm_hw_constraint_list wm8731_constraints_12288000_18432000 = { .list = wm8731_rates_12288000_18432000, .count = ARRAY_SIZE(wm8731_rates_12288000_18432000), }; static const struct snd_pcm_hw_constraint_list wm8731_constraints_11289600_16934400 = { .list = wm8731_rates_11289600_16934400, .count = ARRAY_SIZE(wm8731_rates_11289600_16934400), }; static inline int get_coeff(int mclk, int rate) { int i; for (i = 0; i < ARRAY_SIZE(coeff_div); i++) { if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk) return i; } return 0; } static int wm8731_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 wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); u16 iface = snd_soc_read(codec, WM8731_IFACE) & 0xfff3; int i = get_coeff(wm8731->sysclk, params_rate(params)); u16 srate = (coeff_div[i].sr << 2) | (coeff_div[i].bosr << 1) | coeff_div[i].usb; wm8731->playback_fs = params_rate(params); snd_soc_write(codec, WM8731_SRATE, srate); /* bit size */ switch (params_width(params)) { case 16: break; case 20: iface |= 0x0004; break; case 24: iface |= 0x0008; break; } wm8731_set_deemph(codec); snd_soc_write(codec, WM8731_IFACE, iface); return 0; } static int wm8731_mute(struct snd_soc_dai *dai, int mute) { struct snd_soc_codec *codec = dai->codec; u16 mute_reg = snd_soc_read(codec, WM8731_APDIGI) & 0xfff7; if (mute) snd_soc_write(codec, WM8731_APDIGI, mute_reg | 0x8); else snd_soc_write(codec, WM8731_APDIGI, mute_reg); return 0; } static int wm8731_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 wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); switch (clk_id) { case WM8731_SYSCLK_XTAL: case WM8731_SYSCLK_MCLK: wm8731->sysclk_type = clk_id; break; default: return -EINVAL; } switch (freq) { case 0: wm8731->constraints = NULL; break; case 12000000: wm8731->constraints = &wm8731_constraints_12000000; break; case 12288000: case 18432000: wm8731->constraints = &wm8731_constraints_12288000_18432000; break; case 16934400: case 11289600: wm8731->constraints = &wm8731_constraints_11289600_16934400; break; default: return -EINVAL; } wm8731->sysclk = freq; snd_soc_dapm_sync(&codec->dapm); return 0; } static int wm8731_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) { struct snd_soc_codec *codec = codec_dai->codec; u16 iface = 0; /* set master/slave audio interface */ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBM_CFM: iface |= 0x0040; break; case SND_SOC_DAIFMT_CBS_CFS: break; default: return -EINVAL; } /* interface format */ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: iface |= 0x0002; break; case SND_SOC_DAIFMT_RIGHT_J: break; case SND_SOC_DAIFMT_LEFT_J: iface |= 0x0001; break; case SND_SOC_DAIFMT_DSP_A: iface |= 0x0013; break; case SND_SOC_DAIFMT_DSP_B: iface |= 0x0003; break; default: return -EINVAL; } /* clock inversion */ switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_NB_NF: break; case SND_SOC_DAIFMT_IB_IF: iface |= 0x0090; break; case SND_SOC_DAIFMT_IB_NF: iface |= 0x0080; break; case SND_SOC_DAIFMT_NB_IF: iface |= 0x0010; break; default: return -EINVAL; } /* set iface */ snd_soc_write(codec, WM8731_IFACE, iface); return 0; } static int wm8731_set_bias_level(struct snd_soc_codec *codec, enum snd_soc_bias_level level) { struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); int ret; u16 reg; switch (level) { case SND_SOC_BIAS_ON: break; case SND_SOC_BIAS_PREPARE: break; case SND_SOC_BIAS_STANDBY: if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies); if (ret != 0) return ret; regcache_sync(wm8731->regmap); } /* Clear PWROFF, gate CLKOUT, everything else as-is */ reg = snd_soc_read(codec, WM8731_PWR) & 0xff7f; snd_soc_write(codec, WM8731_PWR, reg | 0x0040); break; case SND_SOC_BIAS_OFF: snd_soc_write(codec, WM8731_PWR, 0xffff); regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies); regcache_mark_dirty(wm8731->regmap); break; } codec->dapm.bias_level = level; return 0; } static int wm8731_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(dai->codec); if (wm8731->constraints) snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_RATE, wm8731->constraints); return 0; } #define WM8731_RATES SNDRV_PCM_RATE_8000_96000 #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ SNDRV_PCM_FMTBIT_S24_LE) static const struct snd_soc_dai_ops wm8731_dai_ops = { .startup = wm8731_startup, .hw_params = wm8731_hw_params, .digital_mute = wm8731_mute, .set_sysclk = wm8731_set_dai_sysclk, .set_fmt = wm8731_set_dai_fmt, }; static struct snd_soc_dai_driver wm8731_dai = { .name = "wm8731-hifi", .playback = { .stream_name = "Playback", .channels_min = 1, .channels_max = 2, .rates = WM8731_RATES, .formats = WM8731_FORMATS,}, .capture = { .stream_name = "Capture", .channels_min = 1, .channels_max = 2, .rates = WM8731_RATES, .formats = WM8731_FORMATS,}, .ops = &wm8731_dai_ops, .symmetric_rates = 1, }; #ifdef CONFIG_PM static int wm8731_suspend(struct snd_soc_codec *codec) { wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF); return 0; } static int wm8731_resume(struct snd_soc_codec *codec) { wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY); return 0; } #else #define wm8731_suspend NULL #define wm8731_resume NULL #endif static int wm8731_probe(struct snd_soc_codec *codec) { struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); int ret = 0, i; for (i = 0; i < ARRAY_SIZE(wm8731->supplies); i++) wm8731->supplies[i].supply = wm8731_supply_names[i]; ret = devm_regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8731->supplies), wm8731->supplies); if (ret != 0) { dev_err(codec->dev, "Failed to request supplies: %d\n", ret); return ret; } ret = regulator_bulk_enable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies); if (ret != 0) { dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); return ret; } ret = wm8731_reset(codec); if (ret < 0) { dev_err(codec->dev, "Failed to issue reset: %d\n", ret); goto err_regulator_enable; } wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY); /* Latch the update bits */ snd_soc_update_bits(codec, WM8731_LOUT1V, 0x100, 0); snd_soc_update_bits(codec, WM8731_ROUT1V, 0x100, 0); snd_soc_update_bits(codec, WM8731_LINVOL, 0x100, 0); snd_soc_update_bits(codec, WM8731_RINVOL, 0x100, 0); /* Disable bypass path by default */ snd_soc_update_bits(codec, WM8731_APANA, 0x8, 0); /* Regulators will have been enabled by bias management */ regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies); return 0; err_regulator_enable: regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies); return ret; } /* power down chip */ static int wm8731_remove(struct snd_soc_codec *codec) { struct wm8731_priv *wm8731 = snd_soc_codec_get_drvdata(codec); wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF); regulator_bulk_disable(ARRAY_SIZE(wm8731->supplies), wm8731->supplies); return 0; } static struct snd_soc_codec_driver soc_codec_dev_wm8731 = { .probe = wm8731_probe, .remove = wm8731_remove, .suspend = wm8731_suspend, .resume = wm8731_resume, .set_bias_level = wm8731_set_bias_level, .dapm_widgets = wm8731_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(wm8731_dapm_widgets), .dapm_routes = wm8731_intercon, .num_dapm_routes = ARRAY_SIZE(wm8731_intercon), .controls = wm8731_snd_controls, .num_controls = ARRAY_SIZE(wm8731_snd_controls), }; static const struct of_device_id wm8731_of_match[] = { { .compatible = "wlf,wm8731", }, { } }; MODULE_DEVICE_TABLE(of, wm8731_of_match); static const struct regmap_config wm8731_regmap = { .reg_bits = 7, .val_bits = 9, .max_register = WM8731_RESET, .volatile_reg = wm8731_volatile, .writeable_reg = wm8731_writeable, .cache_type = REGCACHE_RBTREE, .reg_defaults = wm8731_reg_defaults, .num_reg_defaults = ARRAY_SIZE(wm8731_reg_defaults), }; #if defined(CONFIG_SPI_MASTER) static int wm8731_spi_probe(struct spi_device *spi) { struct wm8731_priv *wm8731; int ret; wm8731 = devm_kzalloc(&spi->dev, sizeof(struct wm8731_priv), GFP_KERNEL); if (wm8731 == NULL) return -ENOMEM; wm8731->regmap = devm_regmap_init_spi(spi, &wm8731_regmap); if (IS_ERR(wm8731->regmap)) { ret = PTR_ERR(wm8731->regmap); dev_err(&spi->dev, "Failed to allocate register map: %d\n", ret); return ret; } spi_set_drvdata(spi, wm8731); ret = snd_soc_register_codec(&spi->dev, &soc_codec_dev_wm8731, &wm8731_dai, 1); if (ret != 0) { dev_err(&spi->dev, "Failed to register CODEC: %d\n", ret); return ret; } return 0; } static int wm8731_spi_remove(struct spi_device *spi) { snd_soc_unregister_codec(&spi->dev); return 0; } static struct spi_driver wm8731_spi_driver = { .driver = { .name = "wm8731", .owner = THIS_MODULE, .of_match_table = wm8731_of_match, }, .probe = wm8731_spi_probe, .remove = wm8731_spi_remove, }; #endif /* CONFIG_SPI_MASTER */ #if IS_ENABLED(CONFIG_I2C) static int wm8731_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct wm8731_priv *wm8731; int ret; wm8731 = devm_kzalloc(&i2c->dev, sizeof(struct wm8731_priv), GFP_KERNEL); if (wm8731 == NULL) return -ENOMEM; wm8731->regmap = devm_regmap_init_i2c(i2c, &wm8731_regmap); if (IS_ERR(wm8731->regmap)) { ret = PTR_ERR(wm8731->regmap); dev_err(&i2c->dev, "Failed to allocate register map: %d\n", ret); return ret; } i2c_set_clientdata(i2c, wm8731); ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm8731, &wm8731_dai, 1); if (ret != 0) { dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret); return ret; } return 0; } static int wm8731_i2c_remove(struct i2c_client *client) { snd_soc_unregister_codec(&client->dev); return 0; } static const struct i2c_device_id wm8731_i2c_id[] = { { "wm8731", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, wm8731_i2c_id); static struct i2c_driver wm8731_i2c_driver = { .driver = { .name = "wm8731", .owner = THIS_MODULE, .of_match_table = wm8731_of_match, }, .probe = wm8731_i2c_probe, .remove = wm8731_i2c_remove, .id_table = wm8731_i2c_id, }; #endif static int __init wm8731_modinit(void) { int ret = 0; #if IS_ENABLED(CONFIG_I2C) ret = i2c_add_driver(&wm8731_i2c_driver); if (ret != 0) { printk(KERN_ERR "Failed to register WM8731 I2C driver: %d\n", ret); } #endif #if defined(CONFIG_SPI_MASTER) ret = spi_register_driver(&wm8731_spi_driver); if (ret != 0) { printk(KERN_ERR "Failed to register WM8731 SPI driver: %d\n", ret); } #endif return ret; } module_init(wm8731_modinit); static void __exit wm8731_exit(void) { #if IS_ENABLED(CONFIG_I2C) i2c_del_driver(&wm8731_i2c_driver); #endif #if defined(CONFIG_SPI_MASTER) spi_unregister_driver(&wm8731_spi_driver); #endif } module_exit(wm8731_exit); MODULE_DESCRIPTION("ASoC WM8731 driver"); MODULE_AUTHOR("Richard Purdie"); MODULE_LICENSE("GPL");