/* * wm8510.c -- WM8510 ALSA Soc Audio driver * * Copyright 2006 Wolfson Microelectronics PLC. * * Author: Liam Girdwood <lrg@slimlogic.co.uk> * * 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 <linux/module.h> #include <linux/moduleparam.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/pm.h> #include <linux/i2c.h> #include <linux/spi/spi.h> #include <linux/slab.h> #include <linux/of_device.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> #include <sound/initval.h> #include "wm8510.h" /* * wm8510 register cache * We can't read the WM8510 register space when we are * using 2 wire for device control, so we cache them instead. */ static const u16 wm8510_reg[WM8510_CACHEREGNUM] = { 0x0000, 0x0000, 0x0000, 0x0000, 0x0050, 0x0000, 0x0140, 0x0000, 0x0000, 0x0000, 0x0000, 0x00ff, 0x0000, 0x0000, 0x0100, 0x00ff, 0x0000, 0x0000, 0x012c, 0x002c, 0x002c, 0x002c, 0x002c, 0x0000, 0x0032, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0038, 0x000b, 0x0032, 0x0000, 0x0008, 0x000c, 0x0093, 0x00e9, 0x0000, 0x0000, 0x0000, 0x0000, 0x0003, 0x0010, 0x0000, 0x0000, 0x0000, 0x0002, 0x0001, 0x0000, 0x0000, 0x0000, 0x0039, 0x0000, 0x0001, }; #define WM8510_POWER1_BIASEN 0x08 #define WM8510_POWER1_BUFIOEN 0x10 #define wm8510_reset(c) snd_soc_write(c, WM8510_RESET, 0) /* codec private data */ struct wm8510_priv { enum snd_soc_control_type control_type; }; static const char *wm8510_companding[] = { "Off", "NC", "u-law", "A-law" }; static const char *wm8510_deemp[] = { "None", "32kHz", "44.1kHz", "48kHz" }; static const char *wm8510_alc[] = { "ALC", "Limiter" }; static const struct soc_enum wm8510_enum[] = { SOC_ENUM_SINGLE(WM8510_COMP, 1, 4, wm8510_companding), /* adc */ SOC_ENUM_SINGLE(WM8510_COMP, 3, 4, wm8510_companding), /* dac */ SOC_ENUM_SINGLE(WM8510_DAC, 4, 4, wm8510_deemp), SOC_ENUM_SINGLE(WM8510_ALC3, 8, 2, wm8510_alc), }; static const struct snd_kcontrol_new wm8510_snd_controls[] = { SOC_SINGLE("Digital Loopback Switch", WM8510_COMP, 0, 1, 0), SOC_ENUM("DAC Companding", wm8510_enum[1]), SOC_ENUM("ADC Companding", wm8510_enum[0]), SOC_ENUM("Playback De-emphasis", wm8510_enum[2]), SOC_SINGLE("DAC Inversion Switch", WM8510_DAC, 0, 1, 0), SOC_SINGLE("Master Playback Volume", WM8510_DACVOL, 0, 127, 0), SOC_SINGLE("High Pass Filter Switch", WM8510_ADC, 8, 1, 0), SOC_SINGLE("High Pass Cut Off", WM8510_ADC, 4, 7, 0), SOC_SINGLE("ADC Inversion Switch", WM8510_COMP, 0, 1, 0), SOC_SINGLE("Capture Volume", WM8510_ADCVOL, 0, 127, 0), SOC_SINGLE("DAC Playback Limiter Switch", WM8510_DACLIM1, 8, 1, 0), SOC_SINGLE("DAC Playback Limiter Decay", WM8510_DACLIM1, 4, 15, 0), SOC_SINGLE("DAC Playback Limiter Attack", WM8510_DACLIM1, 0, 15, 0), SOC_SINGLE("DAC Playback Limiter Threshold", WM8510_DACLIM2, 4, 7, 0), SOC_SINGLE("DAC Playback Limiter Boost", WM8510_DACLIM2, 0, 15, 0), SOC_SINGLE("ALC Enable Switch", WM8510_ALC1, 8, 1, 0), SOC_SINGLE("ALC Capture Max Gain", WM8510_ALC1, 3, 7, 0), SOC_SINGLE("ALC Capture Min Gain", WM8510_ALC1, 0, 7, 0), SOC_SINGLE("ALC Capture ZC Switch", WM8510_ALC2, 8, 1, 0), SOC_SINGLE("ALC Capture Hold", WM8510_ALC2, 4, 7, 0), SOC_SINGLE("ALC Capture Target", WM8510_ALC2, 0, 15, 0), SOC_ENUM("ALC Capture Mode", wm8510_enum[3]), SOC_SINGLE("ALC Capture Decay", WM8510_ALC3, 4, 15, 0), SOC_SINGLE("ALC Capture Attack", WM8510_ALC3, 0, 15, 0), SOC_SINGLE("ALC Capture Noise Gate Switch", WM8510_NGATE, 3, 1, 0), SOC_SINGLE("ALC Capture Noise Gate Threshold", WM8510_NGATE, 0, 7, 0), SOC_SINGLE("Capture PGA ZC Switch", WM8510_INPPGA, 7, 1, 0), SOC_SINGLE("Capture PGA Volume", WM8510_INPPGA, 0, 63, 0), SOC_SINGLE("Speaker Playback ZC Switch", WM8510_SPKVOL, 7, 1, 0), SOC_SINGLE("Speaker Playback Switch", WM8510_SPKVOL, 6, 1, 1), SOC_SINGLE("Speaker Playback Volume", WM8510_SPKVOL, 0, 63, 0), SOC_SINGLE("Speaker Boost", WM8510_OUTPUT, 2, 1, 0), SOC_SINGLE("Capture Boost(+20dB)", WM8510_ADCBOOST, 8, 1, 0), SOC_SINGLE("Mono Playback Switch", WM8510_MONOMIX, 6, 1, 1), }; /* Speaker Output Mixer */ static const struct snd_kcontrol_new wm8510_speaker_mixer_controls[] = { SOC_DAPM_SINGLE("Line Bypass Switch", WM8510_SPKMIX, 1, 1, 0), SOC_DAPM_SINGLE("Aux Playback Switch", WM8510_SPKMIX, 5, 1, 0), SOC_DAPM_SINGLE("PCM Playback Switch", WM8510_SPKMIX, 0, 1, 0), }; /* Mono Output Mixer */ static const struct snd_kcontrol_new wm8510_mono_mixer_controls[] = { SOC_DAPM_SINGLE("Line Bypass Switch", WM8510_MONOMIX, 1, 1, 0), SOC_DAPM_SINGLE("Aux Playback Switch", WM8510_MONOMIX, 2, 1, 0), SOC_DAPM_SINGLE("PCM Playback Switch", WM8510_MONOMIX, 0, 1, 0), }; static const struct snd_kcontrol_new wm8510_boost_controls[] = { SOC_DAPM_SINGLE("Mic PGA Switch", WM8510_INPPGA, 6, 1, 1), SOC_DAPM_SINGLE("Aux Volume", WM8510_ADCBOOST, 0, 7, 0), SOC_DAPM_SINGLE("Mic Volume", WM8510_ADCBOOST, 4, 7, 0), }; static const struct snd_kcontrol_new wm8510_micpga_controls[] = { SOC_DAPM_SINGLE("MICP Switch", WM8510_INPUT, 0, 1, 0), SOC_DAPM_SINGLE("MICN Switch", WM8510_INPUT, 1, 1, 0), SOC_DAPM_SINGLE("AUX Switch", WM8510_INPUT, 2, 1, 0), }; static const struct snd_soc_dapm_widget wm8510_dapm_widgets[] = { SND_SOC_DAPM_MIXER("Speaker Mixer", WM8510_POWER3, 2, 0, &wm8510_speaker_mixer_controls[0], ARRAY_SIZE(wm8510_speaker_mixer_controls)), SND_SOC_DAPM_MIXER("Mono Mixer", WM8510_POWER3, 3, 0, &wm8510_mono_mixer_controls[0], ARRAY_SIZE(wm8510_mono_mixer_controls)), SND_SOC_DAPM_DAC("DAC", "HiFi Playback", WM8510_POWER3, 0, 0), SND_SOC_DAPM_ADC("ADC", "HiFi Capture", WM8510_POWER2, 0, 0), SND_SOC_DAPM_PGA("Aux Input", WM8510_POWER1, 6, 0, NULL, 0), SND_SOC_DAPM_PGA("SpkN Out", WM8510_POWER3, 5, 0, NULL, 0), SND_SOC_DAPM_PGA("SpkP Out", WM8510_POWER3, 6, 0, NULL, 0), SND_SOC_DAPM_PGA("Mono Out", WM8510_POWER3, 7, 0, NULL, 0), SND_SOC_DAPM_MIXER("Mic PGA", WM8510_POWER2, 2, 0, &wm8510_micpga_controls[0], ARRAY_SIZE(wm8510_micpga_controls)), SND_SOC_DAPM_MIXER("Boost Mixer", WM8510_POWER2, 4, 0, &wm8510_boost_controls[0], ARRAY_SIZE(wm8510_boost_controls)), SND_SOC_DAPM_MICBIAS("Mic Bias", WM8510_POWER1, 4, 0), SND_SOC_DAPM_INPUT("MICN"), SND_SOC_DAPM_INPUT("MICP"), SND_SOC_DAPM_INPUT("AUX"), SND_SOC_DAPM_OUTPUT("MONOOUT"), SND_SOC_DAPM_OUTPUT("SPKOUTP"), SND_SOC_DAPM_OUTPUT("SPKOUTN"), }; static const struct snd_soc_dapm_route wm8510_dapm_routes[] = { /* Mono output mixer */ {"Mono Mixer", "PCM Playback Switch", "DAC"}, {"Mono Mixer", "Aux Playback Switch", "Aux Input"}, {"Mono Mixer", "Line Bypass Switch", "Boost Mixer"}, /* Speaker output mixer */ {"Speaker Mixer", "PCM Playback Switch", "DAC"}, {"Speaker Mixer", "Aux Playback Switch", "Aux Input"}, {"Speaker Mixer", "Line Bypass Switch", "Boost Mixer"}, /* Outputs */ {"Mono Out", NULL, "Mono Mixer"}, {"MONOOUT", NULL, "Mono Out"}, {"SpkN Out", NULL, "Speaker Mixer"}, {"SpkP Out", NULL, "Speaker Mixer"}, {"SPKOUTN", NULL, "SpkN Out"}, {"SPKOUTP", NULL, "SpkP Out"}, /* Microphone PGA */ {"Mic PGA", "MICN Switch", "MICN"}, {"Mic PGA", "MICP Switch", "MICP"}, { "Mic PGA", "AUX Switch", "Aux Input" }, /* Boost Mixer */ {"Boost Mixer", "Mic PGA Switch", "Mic PGA"}, {"Boost Mixer", "Mic Volume", "MICP"}, {"Boost Mixer", "Aux Volume", "Aux Input"}, {"ADC", NULL, "Boost Mixer"}, }; struct pll_ { unsigned int pre_div:4; /* prescale - 1 */ unsigned int n:4; unsigned int k; }; static struct pll_ pll_div; /* The size in bits of the pll divide multiplied by 10 * to allow rounding later */ #define FIXED_PLL_SIZE ((1 << 24) * 10) static void pll_factors(unsigned int target, unsigned int source) { unsigned long long Kpart; unsigned int K, Ndiv, Nmod; Ndiv = target / source; if (Ndiv < 6) { source >>= 1; pll_div.pre_div = 1; Ndiv = target / source; } else pll_div.pre_div = 0; if ((Ndiv < 6) || (Ndiv > 12)) printk(KERN_WARNING "WM8510 N value %u outwith recommended range!d\n", Ndiv); pll_div.n = Ndiv; Nmod = target % source; Kpart = FIXED_PLL_SIZE * (long long)Nmod; do_div(Kpart, source); K = Kpart & 0xFFFFFFFF; /* Check if we need to round */ if ((K % 10) >= 5) K += 5; /* Move down to proper range now rounding is done */ K /= 10; pll_div.k = K; } static int wm8510_set_dai_pll(struct snd_soc_dai *codec_dai, int pll_id, int source, unsigned int freq_in, unsigned int freq_out) { struct snd_soc_codec *codec = codec_dai->codec; u16 reg; if (freq_in == 0 || freq_out == 0) { /* Clock CODEC directly from MCLK */ reg = snd_soc_read(codec, WM8510_CLOCK); snd_soc_write(codec, WM8510_CLOCK, reg & 0x0ff); /* Turn off PLL */ reg = snd_soc_read(codec, WM8510_POWER1); snd_soc_write(codec, WM8510_POWER1, reg & 0x1df); return 0; } pll_factors(freq_out*4, freq_in); snd_soc_write(codec, WM8510_PLLN, (pll_div.pre_div << 4) | pll_div.n); snd_soc_write(codec, WM8510_PLLK1, pll_div.k >> 18); snd_soc_write(codec, WM8510_PLLK2, (pll_div.k >> 9) & 0x1ff); snd_soc_write(codec, WM8510_PLLK3, pll_div.k & 0x1ff); reg = snd_soc_read(codec, WM8510_POWER1); snd_soc_write(codec, WM8510_POWER1, reg | 0x020); /* Run CODEC from PLL instead of MCLK */ reg = snd_soc_read(codec, WM8510_CLOCK); snd_soc_write(codec, WM8510_CLOCK, reg | 0x100); return 0; } /* * Configure WM8510 clock dividers. */ static int wm8510_set_dai_clkdiv(struct snd_soc_dai *codec_dai, int div_id, int div) { struct snd_soc_codec *codec = codec_dai->codec; u16 reg; switch (div_id) { case WM8510_OPCLKDIV: reg = snd_soc_read(codec, WM8510_GPIO) & 0x1cf; snd_soc_write(codec, WM8510_GPIO, reg | div); break; case WM8510_MCLKDIV: reg = snd_soc_read(codec, WM8510_CLOCK) & 0x11f; snd_soc_write(codec, WM8510_CLOCK, reg | div); break; case WM8510_ADCCLK: reg = snd_soc_read(codec, WM8510_ADC) & 0x1f7; snd_soc_write(codec, WM8510_ADC, reg | div); break; case WM8510_DACCLK: reg = snd_soc_read(codec, WM8510_DAC) & 0x1f7; snd_soc_write(codec, WM8510_DAC, reg | div); break; case WM8510_BCLKDIV: reg = snd_soc_read(codec, WM8510_CLOCK) & 0x1e3; snd_soc_write(codec, WM8510_CLOCK, reg | div); break; default: return -EINVAL; } return 0; } static int wm8510_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) { struct snd_soc_codec *codec = codec_dai->codec; u16 iface = 0; u16 clk = snd_soc_read(codec, WM8510_CLOCK) & 0x1fe; /* set master/slave audio interface */ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBM_CFM: clk |= 0x0001; 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 |= 0x0010; break; case SND_SOC_DAIFMT_RIGHT_J: break; case SND_SOC_DAIFMT_LEFT_J: iface |= 0x0008; break; case SND_SOC_DAIFMT_DSP_A: iface |= 0x00018; 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 |= 0x0180; break; case SND_SOC_DAIFMT_IB_NF: iface |= 0x0100; break; case SND_SOC_DAIFMT_NB_IF: iface |= 0x0080; break; default: return -EINVAL; } snd_soc_write(codec, WM8510_IFACE, iface); snd_soc_write(codec, WM8510_CLOCK, clk); return 0; } static int wm8510_pcm_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; u16 iface = snd_soc_read(codec, WM8510_IFACE) & 0x19f; u16 adn = snd_soc_read(codec, WM8510_ADD) & 0x1f1; /* bit size */ switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: break; case SNDRV_PCM_FORMAT_S20_3LE: iface |= 0x0020; break; case SNDRV_PCM_FORMAT_S24_LE: iface |= 0x0040; break; case SNDRV_PCM_FORMAT_S32_LE: iface |= 0x0060; break; } /* filter coefficient */ switch (params_rate(params)) { case 8000: adn |= 0x5 << 1; break; case 11025: adn |= 0x4 << 1; break; case 16000: adn |= 0x3 << 1; break; case 22050: adn |= 0x2 << 1; break; case 32000: adn |= 0x1 << 1; break; case 44100: case 48000: break; } snd_soc_write(codec, WM8510_IFACE, iface); snd_soc_write(codec, WM8510_ADD, adn); return 0; } static int wm8510_mute(struct snd_soc_dai *dai, int mute) { struct snd_soc_codec *codec = dai->codec; u16 mute_reg = snd_soc_read(codec, WM8510_DAC) & 0xffbf; if (mute) snd_soc_write(codec, WM8510_DAC, mute_reg | 0x40); else snd_soc_write(codec, WM8510_DAC, mute_reg); return 0; } /* liam need to make this lower power with dapm */ static int wm8510_set_bias_level(struct snd_soc_codec *codec, enum snd_soc_bias_level level) { u16 power1 = snd_soc_read(codec, WM8510_POWER1) & ~0x3; switch (level) { case SND_SOC_BIAS_ON: case SND_SOC_BIAS_PREPARE: power1 |= 0x1; /* VMID 50k */ snd_soc_write(codec, WM8510_POWER1, power1); break; case SND_SOC_BIAS_STANDBY: power1 |= WM8510_POWER1_BIASEN | WM8510_POWER1_BUFIOEN; if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { snd_soc_cache_sync(codec); /* Initial cap charge at VMID 5k */ snd_soc_write(codec, WM8510_POWER1, power1 | 0x3); mdelay(100); } power1 |= 0x2; /* VMID 500k */ snd_soc_write(codec, WM8510_POWER1, power1); break; case SND_SOC_BIAS_OFF: snd_soc_write(codec, WM8510_POWER1, 0); snd_soc_write(codec, WM8510_POWER2, 0); snd_soc_write(codec, WM8510_POWER3, 0); break; } codec->dapm.bias_level = level; return 0; } #define WM8510_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\ SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000) #define WM8510_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 wm8510_dai_ops = { .hw_params = wm8510_pcm_hw_params, .digital_mute = wm8510_mute, .set_fmt = wm8510_set_dai_fmt, .set_clkdiv = wm8510_set_dai_clkdiv, .set_pll = wm8510_set_dai_pll, }; static struct snd_soc_dai_driver wm8510_dai = { .name = "wm8510-hifi", .playback = { .stream_name = "Playback", .channels_min = 2, .channels_max = 2, .rates = WM8510_RATES, .formats = WM8510_FORMATS,}, .capture = { .stream_name = "Capture", .channels_min = 2, .channels_max = 2, .rates = WM8510_RATES, .formats = WM8510_FORMATS,}, .ops = &wm8510_dai_ops, .symmetric_rates = 1, }; static int wm8510_suspend(struct snd_soc_codec *codec) { wm8510_set_bias_level(codec, SND_SOC_BIAS_OFF); return 0; } static int wm8510_resume(struct snd_soc_codec *codec) { wm8510_set_bias_level(codec, SND_SOC_BIAS_STANDBY); return 0; } static int wm8510_probe(struct snd_soc_codec *codec) { struct wm8510_priv *wm8510 = snd_soc_codec_get_drvdata(codec); int ret; ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8510->control_type); if (ret < 0) { printk(KERN_ERR "wm8510: failed to set cache I/O: %d\n", ret); return ret; } wm8510_reset(codec); /* power on device */ wm8510_set_bias_level(codec, SND_SOC_BIAS_STANDBY); return ret; } /* power down chip */ static int wm8510_remove(struct snd_soc_codec *codec) { struct wm8510_priv *wm8510 = snd_soc_codec_get_drvdata(codec); wm8510_set_bias_level(codec, SND_SOC_BIAS_OFF); kfree(wm8510); return 0; } static struct snd_soc_codec_driver soc_codec_dev_wm8510 = { .probe = wm8510_probe, .remove = wm8510_remove, .suspend = wm8510_suspend, .resume = wm8510_resume, .set_bias_level = wm8510_set_bias_level, .reg_cache_size = ARRAY_SIZE(wm8510_reg), .reg_word_size = sizeof(u16), .reg_cache_default =wm8510_reg, .controls = wm8510_snd_controls, .num_controls = ARRAY_SIZE(wm8510_snd_controls), .dapm_widgets = wm8510_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(wm8510_dapm_widgets), .dapm_routes = wm8510_dapm_routes, .num_dapm_routes = ARRAY_SIZE(wm8510_dapm_routes), }; static const struct of_device_id wm8510_of_match[] = { { .compatible = "wlf,wm8510" }, { }, }; #if defined(CONFIG_SPI_MASTER) static int __devinit wm8510_spi_probe(struct spi_device *spi) { struct wm8510_priv *wm8510; int ret; wm8510 = kzalloc(sizeof(struct wm8510_priv), GFP_KERNEL); if (wm8510 == NULL) return -ENOMEM; wm8510->control_type = SND_SOC_SPI; spi_set_drvdata(spi, wm8510); ret = snd_soc_register_codec(&spi->dev, &soc_codec_dev_wm8510, &wm8510_dai, 1); if (ret < 0) kfree(wm8510); return ret; } static int __devexit wm8510_spi_remove(struct spi_device *spi) { snd_soc_unregister_codec(&spi->dev); return 0; } static struct spi_driver wm8510_spi_driver = { .driver = { .name = "wm8510", .owner = THIS_MODULE, .of_match_table = wm8510_of_match, }, .probe = wm8510_spi_probe, .remove = __devexit_p(wm8510_spi_remove), }; #endif /* CONFIG_SPI_MASTER */ #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) static __devinit int wm8510_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct wm8510_priv *wm8510; int ret; wm8510 = kzalloc(sizeof(struct wm8510_priv), GFP_KERNEL); if (wm8510 == NULL) return -ENOMEM; i2c_set_clientdata(i2c, wm8510); wm8510->control_type = SND_SOC_I2C; ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm8510, &wm8510_dai, 1); if (ret < 0) kfree(wm8510); return ret; } static __devexit int wm8510_i2c_remove(struct i2c_client *client) { snd_soc_unregister_codec(&client->dev); return 0; } static const struct i2c_device_id wm8510_i2c_id[] = { { "wm8510", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, wm8510_i2c_id); static struct i2c_driver wm8510_i2c_driver = { .driver = { .name = "wm8510", .owner = THIS_MODULE, .of_match_table = wm8510_of_match, }, .probe = wm8510_i2c_probe, .remove = __devexit_p(wm8510_i2c_remove), .id_table = wm8510_i2c_id, }; #endif static int __init wm8510_modinit(void) { int ret = 0; #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) ret = i2c_add_driver(&wm8510_i2c_driver); if (ret != 0) { printk(KERN_ERR "Failed to register WM8510 I2C driver: %d\n", ret); } #endif #if defined(CONFIG_SPI_MASTER) ret = spi_register_driver(&wm8510_spi_driver); if (ret != 0) { printk(KERN_ERR "Failed to register WM8510 SPI driver: %d\n", ret); } #endif return ret; } module_init(wm8510_modinit); static void __exit wm8510_exit(void) { #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) i2c_del_driver(&wm8510_i2c_driver); #endif #if defined(CONFIG_SPI_MASTER) spi_unregister_driver(&wm8510_spi_driver); #endif } module_exit(wm8510_exit); MODULE_DESCRIPTION("ASoC WM8510 driver"); MODULE_AUTHOR("Liam Girdwood"); MODULE_LICENSE("GPL");