/* * wm8731.c -- WM8731 ALSA SoC Audio driver * * Copyright 2005 Openedhand Ltd. * * 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 "wm8731.h" static struct snd_soc_codec *wm8731_codec; struct snd_soc_codec_device soc_codec_dev_wm8731; /* codec private data */ struct wm8731_priv { struct snd_soc_codec codec; u16 reg_cache[WM8731_CACHEREGNUM]; unsigned int sysclk; }; #ifdef CONFIG_SPI_MASTER static int wm8731_spi_write(struct spi_device *spi, const char *data, int len); #endif /* * wm8731 register cache * We can't read the WM8731 register space when we are * using 2 wire for device control, so we cache them instead. * There is no point in caching the reset register */ static const u16 wm8731_reg[WM8731_CACHEREGNUM] = { 0x0097, 0x0097, 0x0079, 0x0079, 0x000a, 0x0008, 0x009f, 0x000a, 0x0000, 0x0000 }; /* * read wm8731 register cache */ static inline unsigned int wm8731_read_reg_cache(struct snd_soc_codec *codec, unsigned int reg) { u16 *cache = codec->reg_cache; if (reg == WM8731_RESET) return 0; if (reg >= WM8731_CACHEREGNUM) return -1; return cache[reg]; } /* * write wm8731 register cache */ static inline void wm8731_write_reg_cache(struct snd_soc_codec *codec, u16 reg, unsigned int value) { u16 *cache = codec->reg_cache; if (reg >= WM8731_CACHEREGNUM) return; cache[reg] = value; } /* * write to the WM8731 register space */ static int wm8731_write(struct snd_soc_codec *codec, unsigned int reg, unsigned int value) { u8 data[2]; /* data is * D15..D9 WM8731 register offset * D8...D0 register data */ data[0] = (reg << 1) | ((value >> 8) & 0x0001); data[1] = value & 0x00ff; wm8731_write_reg_cache(codec, reg, value); if (codec->hw_write(codec->control_data, data, 2) == 2) return 0; else return -EIO; } #define wm8731_reset(c) wm8731_write(c, WM8731_RESET, 0) static const char *wm8731_input_select[] = {"Line In", "Mic"}; static const char *wm8731_deemph[] = {"None", "32Khz", "44.1Khz", "48Khz"}; static const struct soc_enum wm8731_enum[] = { SOC_ENUM_SINGLE(WM8731_APANA, 2, 2, wm8731_input_select), SOC_ENUM_SINGLE(WM8731_APDIGI, 1, 4, wm8731_deemph), }; 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 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("Mic Boost (+20dB)", WM8731_APANA, 0, 1, 0), 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_ENUM("Playback De-emphasis", wm8731_enum[1]), }; /* 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_enum[0]); static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = { 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 const struct snd_soc_dapm_route intercon[] = { /* 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"}, }; static int wm8731_add_widgets(struct snd_soc_codec *codec) { snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets, ARRAY_SIZE(wm8731_dapm_widgets)); snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon)); snd_soc_dapm_new_widgets(codec); return 0; } 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}, }; 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_pcm_runtime *rtd = substream->private_data; struct snd_soc_device *socdev = rtd->socdev; struct snd_soc_codec *codec = socdev->card->codec; struct wm8731_priv *wm8731 = codec->private_data; u16 iface = wm8731_read_reg_cache(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_write(codec, WM8731_SRATE, srate); /* bit size */ switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: break; case SNDRV_PCM_FORMAT_S20_3LE: iface |= 0x0004; break; case SNDRV_PCM_FORMAT_S24_LE: iface |= 0x0008; break; } wm8731_write(codec, WM8731_IFACE, iface); return 0; } static int wm8731_pcm_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_device *socdev = rtd->socdev; struct snd_soc_codec *codec = socdev->card->codec; /* set active */ wm8731_write(codec, WM8731_ACTIVE, 0x0001); return 0; } static void wm8731_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct snd_soc_device *socdev = rtd->socdev; struct snd_soc_codec *codec = socdev->card->codec; /* deactivate */ if (!codec->active) { udelay(50); wm8731_write(codec, WM8731_ACTIVE, 0x0); } } static int wm8731_mute(struct snd_soc_dai *dai, int mute) { struct snd_soc_codec *codec = dai->codec; u16 mute_reg = wm8731_read_reg_cache(codec, WM8731_APDIGI) & 0xfff7; if (mute) wm8731_write(codec, WM8731_APDIGI, mute_reg | 0x8); else wm8731_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 = codec->private_data; switch (freq) { case 11289600: case 12000000: case 12288000: case 16934400: case 18432000: wm8731->sysclk = freq; return 0; } return -EINVAL; } 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 |= 0x0003; break; case SND_SOC_DAIFMT_DSP_B: iface |= 0x0013; 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 */ wm8731_write(codec, WM8731_IFACE, iface); return 0; } static int wm8731_set_bias_level(struct snd_soc_codec *codec, enum snd_soc_bias_level level) { u16 reg; switch (level) { case SND_SOC_BIAS_ON: break; case SND_SOC_BIAS_PREPARE: break; case SND_SOC_BIAS_STANDBY: /* Clear PWROFF, gate CLKOUT, everything else as-is */ reg = wm8731_read_reg_cache(codec, WM8731_PWR) & 0xff7f; wm8731_write(codec, WM8731_PWR, reg | 0x0040); break; case SND_SOC_BIAS_OFF: wm8731_write(codec, WM8731_ACTIVE, 0x0); wm8731_write(codec, WM8731_PWR, 0xffff); break; } codec->bias_level = level; return 0; } #define WM8731_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\ SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\ SNDRV_PCM_RATE_96000) #define WM8731_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ SNDRV_PCM_FMTBIT_S24_LE) static struct snd_soc_dai_ops wm8731_dai_ops = { .prepare = wm8731_pcm_prepare, .hw_params = wm8731_hw_params, .shutdown = wm8731_shutdown, .digital_mute = wm8731_mute, .set_sysclk = wm8731_set_dai_sysclk, .set_fmt = wm8731_set_dai_fmt, }; struct snd_soc_dai wm8731_dai = { .name = "WM8731", .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, }; EXPORT_SYMBOL_GPL(wm8731_dai); #ifdef CONFIG_PM static int wm8731_suspend(struct platform_device *pdev, pm_message_t state) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); struct snd_soc_codec *codec = socdev->card->codec; wm8731_write(codec, WM8731_ACTIVE, 0x0); wm8731_set_bias_level(codec, SND_SOC_BIAS_OFF); return 0; } static int wm8731_resume(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); struct snd_soc_codec *codec = socdev->card->codec; int i; u8 data[2]; u16 *cache = codec->reg_cache; /* Sync reg_cache with the hardware */ for (i = 0; i < ARRAY_SIZE(wm8731_reg); i++) { data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001); data[1] = cache[i] & 0x00ff; codec->hw_write(codec->control_data, data, 2); } wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY); wm8731_set_bias_level(codec, codec->suspend_bias_level); return 0; } #else #define wm8731_suspend NULL #define wm8731_resume NULL #endif static int wm8731_probe(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); struct snd_soc_codec *codec; int ret = 0; if (wm8731_codec == NULL) { dev_err(&pdev->dev, "Codec device not registered\n"); return -ENODEV; } socdev->card->codec = wm8731_codec; codec = wm8731_codec; /* register pcms */ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); if (ret < 0) { dev_err(codec->dev, "failed to create pcms: %d\n", ret); goto pcm_err; } snd_soc_add_controls(codec, wm8731_snd_controls, ARRAY_SIZE(wm8731_snd_controls)); wm8731_add_widgets(codec); ret = snd_soc_init_card(socdev); if (ret < 0) { dev_err(codec->dev, "failed to register card: %d\n", ret); goto card_err; } return ret; card_err: snd_soc_free_pcms(socdev); snd_soc_dapm_free(socdev); pcm_err: return ret; } /* power down chip */ static int wm8731_remove(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); snd_soc_free_pcms(socdev); snd_soc_dapm_free(socdev); return 0; } struct snd_soc_codec_device soc_codec_dev_wm8731 = { .probe = wm8731_probe, .remove = wm8731_remove, .suspend = wm8731_suspend, .resume = wm8731_resume, }; EXPORT_SYMBOL_GPL(soc_codec_dev_wm8731); static int wm8731_register(struct wm8731_priv *wm8731) { int ret; struct snd_soc_codec *codec = &wm8731->codec; u16 reg; if (wm8731_codec) { dev_err(codec->dev, "Another WM8731 is registered\n"); ret = -EINVAL; goto err; } mutex_init(&codec->mutex); INIT_LIST_HEAD(&codec->dapm_widgets); INIT_LIST_HEAD(&codec->dapm_paths); codec->private_data = wm8731; codec->name = "WM8731"; codec->owner = THIS_MODULE; codec->read = wm8731_read_reg_cache; codec->write = wm8731_write; codec->bias_level = SND_SOC_BIAS_OFF; codec->set_bias_level = wm8731_set_bias_level; codec->dai = &wm8731_dai; codec->num_dai = 1; codec->reg_cache_size = WM8731_CACHEREGNUM; codec->reg_cache = &wm8731->reg_cache; memcpy(codec->reg_cache, wm8731_reg, sizeof(wm8731_reg)); ret = wm8731_reset(codec); if (ret < 0) { dev_err(codec->dev, "Failed to issue reset: %d\n", ret); goto err; } wm8731_dai.dev = codec->dev; wm8731_set_bias_level(codec, SND_SOC_BIAS_STANDBY); /* Latch the update bits */ reg = wm8731_read_reg_cache(codec, WM8731_LOUT1V); wm8731_write(codec, WM8731_LOUT1V, reg & ~0x0100); reg = wm8731_read_reg_cache(codec, WM8731_ROUT1V); wm8731_write(codec, WM8731_ROUT1V, reg & ~0x0100); reg = wm8731_read_reg_cache(codec, WM8731_LINVOL); wm8731_write(codec, WM8731_LINVOL, reg & ~0x0100); reg = wm8731_read_reg_cache(codec, WM8731_RINVOL); wm8731_write(codec, WM8731_RINVOL, reg & ~0x0100); /* Disable bypass path by default */ reg = wm8731_read_reg_cache(codec, WM8731_APANA); wm8731_write(codec, WM8731_APANA, reg & ~0x4); wm8731_codec = codec; ret = snd_soc_register_codec(codec); if (ret != 0) { dev_err(codec->dev, "Failed to register codec: %d\n", ret); goto err; } ret = snd_soc_register_dai(&wm8731_dai); if (ret != 0) { dev_err(codec->dev, "Failed to register DAI: %d\n", ret); snd_soc_unregister_codec(codec); goto err_codec; } return 0; err_codec: snd_soc_unregister_codec(codec); err: kfree(wm8731); return ret; } static void wm8731_unregister(struct wm8731_priv *wm8731) { wm8731_set_bias_level(&wm8731->codec, SND_SOC_BIAS_OFF); snd_soc_unregister_dai(&wm8731_dai); snd_soc_unregister_codec(&wm8731->codec); kfree(wm8731); wm8731_codec = NULL; } #if defined(CONFIG_SPI_MASTER) static int wm8731_spi_write(struct spi_device *spi, const char *data, int len) { struct spi_transfer t; struct spi_message m; u8 msg[2]; if (len <= 0) return 0; msg[0] = data[0]; msg[1] = data[1]; spi_message_init(&m); memset(&t, 0, (sizeof t)); t.tx_buf = &msg[0]; t.len = len; spi_message_add_tail(&t, &m); spi_sync(spi, &m); return len; } static int __devinit wm8731_spi_probe(struct spi_device *spi) { struct snd_soc_codec *codec; struct wm8731_priv *wm8731; wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL); if (wm8731 == NULL) return -ENOMEM; codec = &wm8731->codec; codec->control_data = spi; codec->hw_write = (hw_write_t)wm8731_spi_write; codec->dev = &spi->dev; dev_set_drvdata(&spi->dev, wm8731); return wm8731_register(wm8731); } static int __devexit wm8731_spi_remove(struct spi_device *spi) { struct wm8731_priv *wm8731 = dev_get_drvdata(&spi->dev); wm8731_unregister(wm8731); return 0; } #ifdef CONFIG_PM static int wm8731_spi_suspend(struct spi_device *spi, pm_message_t msg) { return snd_soc_suspend_device(&spi->dev); } static int wm8731_spi_resume(struct spi_device *spi) { return snd_soc_resume_device(&spi->dev); } #else #define wm8731_spi_suspend NULL #define wm8731_spi_resume NULL #endif static struct spi_driver wm8731_spi_driver = { .driver = { .name = "wm8731", .bus = &spi_bus_type, .owner = THIS_MODULE, }, .probe = wm8731_spi_probe, .suspend = wm8731_spi_suspend, .resume = wm8731_spi_resume, .remove = __devexit_p(wm8731_spi_remove), }; #endif /* CONFIG_SPI_MASTER */ #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) static __devinit int wm8731_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct wm8731_priv *wm8731; struct snd_soc_codec *codec; wm8731 = kzalloc(sizeof(struct wm8731_priv), GFP_KERNEL); if (wm8731 == NULL) return -ENOMEM; codec = &wm8731->codec; codec->hw_write = (hw_write_t)i2c_master_send; i2c_set_clientdata(i2c, wm8731); codec->control_data = i2c; codec->dev = &i2c->dev; return wm8731_register(wm8731); } static __devexit int wm8731_i2c_remove(struct i2c_client *client) { struct wm8731_priv *wm8731 = i2c_get_clientdata(client); wm8731_unregister(wm8731); return 0; } #ifdef CONFIG_PM static int wm8731_i2c_suspend(struct i2c_client *i2c, pm_message_t msg) { return snd_soc_suspend_device(&i2c->dev); } static int wm8731_i2c_resume(struct i2c_client *i2c) { return snd_soc_resume_device(&i2c->dev); } #else #define wm8731_i2c_suspend NULL #define wm8731_i2c_resume NULL #endif 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 I2C Codec", .owner = THIS_MODULE, }, .probe = wm8731_i2c_probe, .remove = __devexit_p(wm8731_i2c_remove), .suspend = wm8731_i2c_suspend, .resume = wm8731_i2c_resume, .id_table = wm8731_i2c_id, }; #endif static int __init wm8731_modinit(void) { int ret; #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 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 0; } module_init(wm8731_modinit); static void __exit wm8731_exit(void) { #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 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");