/* * wm8737.c -- WM8737 ALSA SoC Audio driver * * Copyright 2010 Wolfson Microelectronics plc * * Author: Mark Brown * * 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 #include "wm8737.h" #define WM8737_NUM_SUPPLIES 4 static const char *wm8737_supply_names[WM8737_NUM_SUPPLIES] = { "DCVDD", "DBVDD", "AVDD", "MVDD", }; /* codec private data */ struct wm8737_priv { struct regmap *regmap; struct regulator_bulk_data supplies[WM8737_NUM_SUPPLIES]; unsigned int mclk; }; static const struct reg_default wm8737_reg_defaults[] = { { 0, 0x00C3 }, /* R0 - Left PGA volume */ { 1, 0x00C3 }, /* R1 - Right PGA volume */ { 2, 0x0007 }, /* R2 - AUDIO path L */ { 3, 0x0007 }, /* R3 - AUDIO path R */ { 4, 0x0000 }, /* R4 - 3D Enhance */ { 5, 0x0000 }, /* R5 - ADC Control */ { 6, 0x0000 }, /* R6 - Power Management */ { 7, 0x000A }, /* R7 - Audio Format */ { 8, 0x0000 }, /* R8 - Clocking */ { 9, 0x000F }, /* R9 - MIC Preamp Control */ { 10, 0x0003 }, /* R10 - Misc Bias Control */ { 11, 0x0000 }, /* R11 - Noise Gate */ { 12, 0x007C }, /* R12 - ALC1 */ { 13, 0x0000 }, /* R13 - ALC2 */ { 14, 0x0032 }, /* R14 - ALC3 */ }; static bool wm8737_volatile(struct device *dev, unsigned int reg) { switch (reg) { case WM8737_RESET: return true; default: return false; } } static int wm8737_reset(struct snd_soc_codec *codec) { return snd_soc_write(codec, WM8737_RESET, 0); } static const unsigned int micboost_tlv[] = { TLV_DB_RANGE_HEAD(4), 0, 0, TLV_DB_SCALE_ITEM(1300, 0, 0), 1, 1, TLV_DB_SCALE_ITEM(1800, 0, 0), 2, 2, TLV_DB_SCALE_ITEM(2800, 0, 0), 3, 3, TLV_DB_SCALE_ITEM(3300, 0, 0), }; static const DECLARE_TLV_DB_SCALE(pga_tlv, -9750, 50, 1); static const DECLARE_TLV_DB_SCALE(adc_tlv, -600, 600, 0); static const DECLARE_TLV_DB_SCALE(ng_tlv, -7800, 600, 0); static const DECLARE_TLV_DB_SCALE(alc_max_tlv, -1200, 600, 0); static const DECLARE_TLV_DB_SCALE(alc_target_tlv, -1800, 100, 0); static const char *micbias_enum_text[] = { "25%", "50%", "75%", "100%", }; static SOC_ENUM_SINGLE_DECL(micbias_enum, WM8737_MIC_PREAMP_CONTROL, 0, micbias_enum_text); static const char *low_cutoff_text[] = { "Low", "High" }; static SOC_ENUM_SINGLE_DECL(low_3d, WM8737_3D_ENHANCE, 6, low_cutoff_text); static const char *high_cutoff_text[] = { "High", "Low" }; static SOC_ENUM_SINGLE_DECL(high_3d, WM8737_3D_ENHANCE, 5, high_cutoff_text); static const char *alc_fn_text[] = { "Disabled", "Right", "Left", "Stereo" }; static SOC_ENUM_SINGLE_DECL(alc_fn, WM8737_ALC1, 7, alc_fn_text); static const char *alc_hold_text[] = { "0", "2.67ms", "5.33ms", "10.66ms", "21.32ms", "42.64ms", "85.28ms", "170.56ms", "341.12ms", "682.24ms", "1.364s", "2.728s", "5.458s", "10.916s", "21.832s", "43.691s" }; static SOC_ENUM_SINGLE_DECL(alc_hold, WM8737_ALC2, 0, alc_hold_text); static const char *alc_atk_text[] = { "8.4ms", "16.8ms", "33.6ms", "67.2ms", "134.4ms", "268.8ms", "537.6ms", "1.075s", "2.15s", "4.3s", "8.6s" }; static SOC_ENUM_SINGLE_DECL(alc_atk, WM8737_ALC3, 0, alc_atk_text); static const char *alc_dcy_text[] = { "33.6ms", "67.2ms", "134.4ms", "268.8ms", "537.6ms", "1.075s", "2.15s", "4.3s", "8.6s", "17.2s", "34.41s" }; static SOC_ENUM_SINGLE_DECL(alc_dcy, WM8737_ALC3, 4, alc_dcy_text); static const struct snd_kcontrol_new wm8737_snd_controls[] = { SOC_DOUBLE_R_TLV("Mic Boost Volume", WM8737_AUDIO_PATH_L, WM8737_AUDIO_PATH_R, 6, 3, 0, micboost_tlv), SOC_DOUBLE_R("Mic Boost Switch", WM8737_AUDIO_PATH_L, WM8737_AUDIO_PATH_R, 4, 1, 0), SOC_DOUBLE("Mic ZC Switch", WM8737_AUDIO_PATH_L, WM8737_AUDIO_PATH_R, 3, 1, 0), SOC_DOUBLE_R_TLV("Capture Volume", WM8737_LEFT_PGA_VOLUME, WM8737_RIGHT_PGA_VOLUME, 0, 255, 0, pga_tlv), SOC_DOUBLE("Capture ZC Switch", WM8737_AUDIO_PATH_L, WM8737_AUDIO_PATH_R, 2, 1, 0), SOC_DOUBLE("INPUT1 DC Bias Switch", WM8737_MISC_BIAS_CONTROL, 0, 1, 1, 0), SOC_ENUM("Mic PGA Bias", micbias_enum), SOC_SINGLE("ADC Low Power Switch", WM8737_ADC_CONTROL, 2, 1, 0), SOC_SINGLE("High Pass Filter Switch", WM8737_ADC_CONTROL, 0, 1, 1), SOC_DOUBLE("Polarity Invert Switch", WM8737_ADC_CONTROL, 5, 6, 1, 0), SOC_SINGLE("3D Switch", WM8737_3D_ENHANCE, 0, 1, 0), SOC_SINGLE("3D Depth", WM8737_3D_ENHANCE, 1, 15, 0), SOC_ENUM("3D Low Cut-off", low_3d), SOC_ENUM("3D High Cut-off", low_3d), SOC_SINGLE_TLV("3D ADC Volume", WM8737_3D_ENHANCE, 7, 1, 1, adc_tlv), SOC_SINGLE("Noise Gate Switch", WM8737_NOISE_GATE, 0, 1, 0), SOC_SINGLE_TLV("Noise Gate Threshold Volume", WM8737_NOISE_GATE, 2, 7, 0, ng_tlv), SOC_ENUM("ALC", alc_fn), SOC_SINGLE_TLV("ALC Max Gain Volume", WM8737_ALC1, 4, 7, 0, alc_max_tlv), SOC_SINGLE_TLV("ALC Target Volume", WM8737_ALC1, 0, 15, 0, alc_target_tlv), SOC_ENUM("ALC Hold Time", alc_hold), SOC_SINGLE("ALC ZC Switch", WM8737_ALC2, 4, 1, 0), SOC_ENUM("ALC Attack Time", alc_atk), SOC_ENUM("ALC Decay Time", alc_dcy), }; static const char *linsel_text[] = { "LINPUT1", "LINPUT2", "LINPUT3", "LINPUT1 DC", }; static SOC_ENUM_SINGLE_DECL(linsel_enum, WM8737_AUDIO_PATH_L, 7, linsel_text); static const struct snd_kcontrol_new linsel_mux = SOC_DAPM_ENUM("LINSEL", linsel_enum); static const char *rinsel_text[] = { "RINPUT1", "RINPUT2", "RINPUT3", "RINPUT1 DC", }; static SOC_ENUM_SINGLE_DECL(rinsel_enum, WM8737_AUDIO_PATH_R, 7, rinsel_text); static const struct snd_kcontrol_new rinsel_mux = SOC_DAPM_ENUM("RINSEL", rinsel_enum); static const char *bypass_text[] = { "Direct", "Preamp" }; static SOC_ENUM_SINGLE_DECL(lbypass_enum, WM8737_MIC_PREAMP_CONTROL, 2, bypass_text); static const struct snd_kcontrol_new lbypass_mux = SOC_DAPM_ENUM("Left Bypass", lbypass_enum); static SOC_ENUM_SINGLE_DECL(rbypass_enum, WM8737_MIC_PREAMP_CONTROL, 3, bypass_text); static const struct snd_kcontrol_new rbypass_mux = SOC_DAPM_ENUM("Left Bypass", rbypass_enum); static const struct snd_soc_dapm_widget wm8737_dapm_widgets[] = { SND_SOC_DAPM_INPUT("LINPUT1"), SND_SOC_DAPM_INPUT("LINPUT2"), SND_SOC_DAPM_INPUT("LINPUT3"), SND_SOC_DAPM_INPUT("RINPUT1"), SND_SOC_DAPM_INPUT("RINPUT2"), SND_SOC_DAPM_INPUT("RINPUT3"), SND_SOC_DAPM_INPUT("LACIN"), SND_SOC_DAPM_INPUT("RACIN"), SND_SOC_DAPM_MUX("LINSEL", SND_SOC_NOPM, 0, 0, &linsel_mux), SND_SOC_DAPM_MUX("RINSEL", SND_SOC_NOPM, 0, 0, &rinsel_mux), SND_SOC_DAPM_MUX("Left Preamp Mux", SND_SOC_NOPM, 0, 0, &lbypass_mux), SND_SOC_DAPM_MUX("Right Preamp Mux", SND_SOC_NOPM, 0, 0, &rbypass_mux), SND_SOC_DAPM_PGA("PGAL", WM8737_POWER_MANAGEMENT, 5, 0, NULL, 0), SND_SOC_DAPM_PGA("PGAR", WM8737_POWER_MANAGEMENT, 4, 0, NULL, 0), SND_SOC_DAPM_DAC("ADCL", NULL, WM8737_POWER_MANAGEMENT, 3, 0), SND_SOC_DAPM_DAC("ADCR", NULL, WM8737_POWER_MANAGEMENT, 2, 0), SND_SOC_DAPM_AIF_OUT("AIF", "Capture", 0, WM8737_POWER_MANAGEMENT, 6, 0), }; static const struct snd_soc_dapm_route intercon[] = { { "LINSEL", "LINPUT1", "LINPUT1" }, { "LINSEL", "LINPUT2", "LINPUT2" }, { "LINSEL", "LINPUT3", "LINPUT3" }, { "LINSEL", "LINPUT1 DC", "LINPUT1" }, { "RINSEL", "RINPUT1", "RINPUT1" }, { "RINSEL", "RINPUT2", "RINPUT2" }, { "RINSEL", "RINPUT3", "RINPUT3" }, { "RINSEL", "RINPUT1 DC", "RINPUT1" }, { "Left Preamp Mux", "Preamp", "LINSEL" }, { "Left Preamp Mux", "Direct", "LACIN" }, { "Right Preamp Mux", "Preamp", "RINSEL" }, { "Right Preamp Mux", "Direct", "RACIN" }, { "PGAL", NULL, "Left Preamp Mux" }, { "PGAR", NULL, "Right Preamp Mux" }, { "ADCL", NULL, "PGAL" }, { "ADCR", NULL, "PGAR" }, { "AIF", NULL, "ADCL" }, { "AIF", NULL, "ADCR" }, }; /* codec mclk clock divider coefficients */ static const struct { u32 mclk; u32 rate; u8 usb; u8 sr; } coeff_div[] = { { 12288000, 8000, 0, 0x4 }, { 12288000, 12000, 0, 0x8 }, { 12288000, 16000, 0, 0xa }, { 12288000, 24000, 0, 0x1c }, { 12288000, 32000, 0, 0xc }, { 12288000, 48000, 0, 0 }, { 12288000, 96000, 0, 0xe }, { 11289600, 8000, 0, 0x14 }, { 11289600, 11025, 0, 0x18 }, { 11289600, 22050, 0, 0x1a }, { 11289600, 44100, 0, 0x10 }, { 11289600, 88200, 0, 0x1e }, { 18432000, 8000, 0, 0x5 }, { 18432000, 12000, 0, 0x9 }, { 18432000, 16000, 0, 0xb }, { 18432000, 24000, 0, 0x1b }, { 18432000, 32000, 0, 0xd }, { 18432000, 48000, 0, 0x1 }, { 18432000, 96000, 0, 0x1f }, { 16934400, 8000, 0, 0x15 }, { 16934400, 11025, 0, 0x19 }, { 16934400, 22050, 0, 0x1b }, { 16934400, 44100, 0, 0x11 }, { 16934400, 88200, 0, 0x1f }, { 12000000, 8000, 1, 0x4 }, { 12000000, 11025, 1, 0x19 }, { 12000000, 12000, 1, 0x8 }, { 12000000, 16000, 1, 0xa }, { 12000000, 22050, 1, 0x1b }, { 12000000, 24000, 1, 0x1c }, { 12000000, 32000, 1, 0xc }, { 12000000, 44100, 1, 0x11 }, { 12000000, 48000, 1, 0x0 }, { 12000000, 88200, 1, 0x1f }, { 12000000, 96000, 1, 0xe }, }; static int wm8737_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 wm8737_priv *wm8737 = snd_soc_codec_get_drvdata(codec); int i; u16 clocking = 0; u16 af = 0; for (i = 0; i < ARRAY_SIZE(coeff_div); i++) { if (coeff_div[i].rate != params_rate(params)) continue; if (coeff_div[i].mclk == wm8737->mclk) break; if (coeff_div[i].mclk == wm8737->mclk * 2) { clocking |= WM8737_CLKDIV2; break; } } if (i == ARRAY_SIZE(coeff_div)) { dev_err(codec->dev, "%dHz MCLK can't support %dHz\n", wm8737->mclk, params_rate(params)); return -EINVAL; } clocking |= coeff_div[i].usb | (coeff_div[i].sr << WM8737_SR_SHIFT); switch (params_width(params)) { case 16: break; case 20: af |= 0x8; break; case 24: af |= 0x10; break; case 32: af |= 0x18; break; default: return -EINVAL; } snd_soc_update_bits(codec, WM8737_AUDIO_FORMAT, WM8737_WL_MASK, af); snd_soc_update_bits(codec, WM8737_CLOCKING, WM8737_USB_MODE | WM8737_CLKDIV2 | WM8737_SR_MASK, clocking); return 0; } static int wm8737_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 wm8737_priv *wm8737 = snd_soc_codec_get_drvdata(codec); int i; for (i = 0; i < ARRAY_SIZE(coeff_div); i++) { if (freq == coeff_div[i].mclk || freq == coeff_div[i].mclk * 2) { wm8737->mclk = freq; return 0; } } dev_err(codec->dev, "MCLK rate %dHz not supported\n", freq); return -EINVAL; } static int wm8737_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) { struct snd_soc_codec *codec = codec_dai->codec; u16 af = 0; switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBM_CFM: af |= WM8737_MS; break; case SND_SOC_DAIFMT_CBS_CFS: break; default: return -EINVAL; } switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: af |= 0x2; break; case SND_SOC_DAIFMT_RIGHT_J: break; case SND_SOC_DAIFMT_LEFT_J: af |= 0x1; break; case SND_SOC_DAIFMT_DSP_A: af |= 0x3; break; case SND_SOC_DAIFMT_DSP_B: af |= 0x13; break; default: return -EINVAL; } switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_NB_NF: break; case SND_SOC_DAIFMT_NB_IF: af |= WM8737_LRP; break; default: return -EINVAL; } snd_soc_update_bits(codec, WM8737_AUDIO_FORMAT, WM8737_FORMAT_MASK | WM8737_LRP | WM8737_MS, af); return 0; } static int wm8737_set_bias_level(struct snd_soc_codec *codec, enum snd_soc_bias_level level) { struct wm8737_priv *wm8737 = snd_soc_codec_get_drvdata(codec); int ret; switch (level) { case SND_SOC_BIAS_ON: break; case SND_SOC_BIAS_PREPARE: /* VMID at 2*75k */ snd_soc_update_bits(codec, WM8737_MISC_BIAS_CONTROL, WM8737_VMIDSEL_MASK, 0); break; case SND_SOC_BIAS_STANDBY: if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { ret = regulator_bulk_enable(ARRAY_SIZE(wm8737->supplies), wm8737->supplies); if (ret != 0) { dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); return ret; } regcache_sync(wm8737->regmap); /* Fast VMID ramp at 2*2.5k */ snd_soc_update_bits(codec, WM8737_MISC_BIAS_CONTROL, WM8737_VMIDSEL_MASK, 0x4); /* Bring VMID up */ snd_soc_update_bits(codec, WM8737_POWER_MANAGEMENT, WM8737_VMID_MASK | WM8737_VREF_MASK, WM8737_VMID_MASK | WM8737_VREF_MASK); msleep(500); } /* VMID at 2*300k */ snd_soc_update_bits(codec, WM8737_MISC_BIAS_CONTROL, WM8737_VMIDSEL_MASK, 2); break; case SND_SOC_BIAS_OFF: snd_soc_update_bits(codec, WM8737_POWER_MANAGEMENT, WM8737_VMID_MASK | WM8737_VREF_MASK, 0); regulator_bulk_disable(ARRAY_SIZE(wm8737->supplies), wm8737->supplies); break; } codec->dapm.bias_level = level; return 0; } #define WM8737_RATES SNDRV_PCM_RATE_8000_96000 #define WM8737_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE) static const struct snd_soc_dai_ops wm8737_dai_ops = { .hw_params = wm8737_hw_params, .set_sysclk = wm8737_set_dai_sysclk, .set_fmt = wm8737_set_dai_fmt, }; static struct snd_soc_dai_driver wm8737_dai = { .name = "wm8737", .capture = { .stream_name = "Capture", .channels_min = 2, /* Mono modes not yet supported */ .channels_max = 2, .rates = WM8737_RATES, .formats = WM8737_FORMATS, }, .ops = &wm8737_dai_ops, }; static int wm8737_probe(struct snd_soc_codec *codec) { struct wm8737_priv *wm8737 = snd_soc_codec_get_drvdata(codec); int ret; ret = regulator_bulk_enable(ARRAY_SIZE(wm8737->supplies), wm8737->supplies); if (ret != 0) { dev_err(codec->dev, "Failed to enable supplies: %d\n", ret); goto err_get; } ret = wm8737_reset(codec); if (ret < 0) { dev_err(codec->dev, "Failed to issue reset\n"); goto err_enable; } snd_soc_update_bits(codec, WM8737_LEFT_PGA_VOLUME, WM8737_LVU, WM8737_LVU); snd_soc_update_bits(codec, WM8737_RIGHT_PGA_VOLUME, WM8737_RVU, WM8737_RVU); snd_soc_codec_force_bias_level(codec, SND_SOC_BIAS_STANDBY); /* Bias level configuration will have done an extra enable */ regulator_bulk_disable(ARRAY_SIZE(wm8737->supplies), wm8737->supplies); return 0; err_enable: regulator_bulk_disable(ARRAY_SIZE(wm8737->supplies), wm8737->supplies); err_get: return ret; } static struct snd_soc_codec_driver soc_codec_dev_wm8737 = { .probe = wm8737_probe, .set_bias_level = wm8737_set_bias_level, .suspend_bias_off = true, .controls = wm8737_snd_controls, .num_controls = ARRAY_SIZE(wm8737_snd_controls), .dapm_widgets = wm8737_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(wm8737_dapm_widgets), .dapm_routes = intercon, .num_dapm_routes = ARRAY_SIZE(intercon), }; static const struct of_device_id wm8737_of_match[] = { { .compatible = "wlf,wm8737", }, { } }; MODULE_DEVICE_TABLE(of, wm8737_of_match); static const struct regmap_config wm8737_regmap = { .reg_bits = 7, .val_bits = 9, .max_register = WM8737_MAX_REGISTER, .reg_defaults = wm8737_reg_defaults, .num_reg_defaults = ARRAY_SIZE(wm8737_reg_defaults), .cache_type = REGCACHE_RBTREE, .volatile_reg = wm8737_volatile, }; #if IS_ENABLED(CONFIG_I2C) static int wm8737_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct wm8737_priv *wm8737; int ret, i; wm8737 = devm_kzalloc(&i2c->dev, sizeof(struct wm8737_priv), GFP_KERNEL); if (wm8737 == NULL) return -ENOMEM; for (i = 0; i < ARRAY_SIZE(wm8737->supplies); i++) wm8737->supplies[i].supply = wm8737_supply_names[i]; ret = devm_regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8737->supplies), wm8737->supplies); if (ret != 0) { dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret); return ret; } wm8737->regmap = devm_regmap_init_i2c(i2c, &wm8737_regmap); if (IS_ERR(wm8737->regmap)) return PTR_ERR(wm8737->regmap); i2c_set_clientdata(i2c, wm8737); ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm8737, &wm8737_dai, 1); return ret; } static int wm8737_i2c_remove(struct i2c_client *client) { snd_soc_unregister_codec(&client->dev); return 0; } static const struct i2c_device_id wm8737_i2c_id[] = { { "wm8737", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, wm8737_i2c_id); static struct i2c_driver wm8737_i2c_driver = { .driver = { .name = "wm8737", .owner = THIS_MODULE, .of_match_table = wm8737_of_match, }, .probe = wm8737_i2c_probe, .remove = wm8737_i2c_remove, .id_table = wm8737_i2c_id, }; #endif #if defined(CONFIG_SPI_MASTER) static int wm8737_spi_probe(struct spi_device *spi) { struct wm8737_priv *wm8737; int ret, i; wm8737 = devm_kzalloc(&spi->dev, sizeof(struct wm8737_priv), GFP_KERNEL); if (wm8737 == NULL) return -ENOMEM; for (i = 0; i < ARRAY_SIZE(wm8737->supplies); i++) wm8737->supplies[i].supply = wm8737_supply_names[i]; ret = devm_regulator_bulk_get(&spi->dev, ARRAY_SIZE(wm8737->supplies), wm8737->supplies); if (ret != 0) { dev_err(&spi->dev, "Failed to request supplies: %d\n", ret); return ret; } wm8737->regmap = devm_regmap_init_spi(spi, &wm8737_regmap); if (IS_ERR(wm8737->regmap)) return PTR_ERR(wm8737->regmap); spi_set_drvdata(spi, wm8737); ret = snd_soc_register_codec(&spi->dev, &soc_codec_dev_wm8737, &wm8737_dai, 1); return ret; } static int wm8737_spi_remove(struct spi_device *spi) { snd_soc_unregister_codec(&spi->dev); return 0; } static struct spi_driver wm8737_spi_driver = { .driver = { .name = "wm8737", .owner = THIS_MODULE, .of_match_table = wm8737_of_match, }, .probe = wm8737_spi_probe, .remove = wm8737_spi_remove, }; #endif /* CONFIG_SPI_MASTER */ static int __init wm8737_modinit(void) { int ret; #if IS_ENABLED(CONFIG_I2C) ret = i2c_add_driver(&wm8737_i2c_driver); if (ret != 0) { printk(KERN_ERR "Failed to register WM8737 I2C driver: %d\n", ret); } #endif #if defined(CONFIG_SPI_MASTER) ret = spi_register_driver(&wm8737_spi_driver); if (ret != 0) { printk(KERN_ERR "Failed to register WM8737 SPI driver: %d\n", ret); } #endif return 0; } module_init(wm8737_modinit); static void __exit wm8737_exit(void) { #if defined(CONFIG_SPI_MASTER) spi_unregister_driver(&wm8737_spi_driver); #endif #if IS_ENABLED(CONFIG_I2C) i2c_del_driver(&wm8737_i2c_driver); #endif } module_exit(wm8737_exit); MODULE_DESCRIPTION("ASoC WM8737 driver"); MODULE_AUTHOR("Mark Brown "); MODULE_LICENSE("GPL");