171cfc902SMark Brown /* 271cfc902SMark Brown * wm8728.c -- WM8728 ALSA SoC Audio driver 371cfc902SMark Brown * 471cfc902SMark Brown * Copyright 2008 Wolfson Microelectronics plc 571cfc902SMark Brown * 671cfc902SMark Brown * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 771cfc902SMark Brown * 871cfc902SMark Brown * This program is free software; you can redistribute it and/or modify 971cfc902SMark Brown * it under the terms of the GNU General Public License version 2 as 1071cfc902SMark Brown * published by the Free Software Foundation. 1171cfc902SMark Brown */ 1271cfc902SMark Brown 1371cfc902SMark Brown #include <linux/module.h> 1471cfc902SMark Brown #include <linux/moduleparam.h> 1571cfc902SMark Brown #include <linux/init.h> 1671cfc902SMark Brown #include <linux/delay.h> 1771cfc902SMark Brown #include <linux/pm.h> 1871cfc902SMark Brown #include <linux/i2c.h> 1971cfc902SMark Brown #include <linux/platform_device.h> 2071cfc902SMark Brown #include <linux/spi/spi.h> 215a0e3ad6STejun Heo #include <linux/slab.h> 2271cfc902SMark Brown #include <sound/core.h> 2371cfc902SMark Brown #include <sound/pcm.h> 2471cfc902SMark Brown #include <sound/pcm_params.h> 2571cfc902SMark Brown #include <sound/soc.h> 2671cfc902SMark Brown #include <sound/soc-dapm.h> 2771cfc902SMark Brown #include <sound/initval.h> 2871cfc902SMark Brown #include <sound/tlv.h> 2971cfc902SMark Brown 3071cfc902SMark Brown #include "wm8728.h" 3171cfc902SMark Brown 3271cfc902SMark Brown /* 3371cfc902SMark Brown * We can't read the WM8728 register space so we cache them instead. 3471cfc902SMark Brown * Note that the defaults here aren't the physical defaults, we latch 3571cfc902SMark Brown * the volume update bits, mute the output and enable infinite zero 3671cfc902SMark Brown * detect. 3771cfc902SMark Brown */ 3871cfc902SMark Brown static const u16 wm8728_reg_defaults[] = { 3971cfc902SMark Brown 0x1ff, 4071cfc902SMark Brown 0x1ff, 4171cfc902SMark Brown 0x001, 4271cfc902SMark Brown 0x100, 4371cfc902SMark Brown }; 4471cfc902SMark Brown 45f0fba2adSLiam Girdwood /* codec private data */ 46f0fba2adSLiam Girdwood struct wm8728_priv { 47f0fba2adSLiam Girdwood enum snd_soc_control_type control_type; 48f0fba2adSLiam Girdwood }; 49f0fba2adSLiam Girdwood 5071cfc902SMark Brown static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1); 5171cfc902SMark Brown 5271cfc902SMark Brown static const struct snd_kcontrol_new wm8728_snd_controls[] = { 5371cfc902SMark Brown 5471cfc902SMark Brown SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL, 5571cfc902SMark Brown 0, 255, 0, wm8728_tlv), 5671cfc902SMark Brown 5771cfc902SMark Brown SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0), 5871cfc902SMark Brown }; 5971cfc902SMark Brown 6071cfc902SMark Brown /* 6171cfc902SMark Brown * DAPM controls. 6271cfc902SMark Brown */ 6371cfc902SMark Brown static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = { 6471cfc902SMark Brown SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0), 6571cfc902SMark Brown SND_SOC_DAPM_OUTPUT("VOUTL"), 6671cfc902SMark Brown SND_SOC_DAPM_OUTPUT("VOUTR"), 6771cfc902SMark Brown }; 6871cfc902SMark Brown 6971cfc902SMark Brown static const struct snd_soc_dapm_route intercon[] = { 7071cfc902SMark Brown {"VOUTL", NULL, "DAC"}, 7171cfc902SMark Brown {"VOUTR", NULL, "DAC"}, 7271cfc902SMark Brown }; 7371cfc902SMark Brown 7471cfc902SMark Brown static int wm8728_add_widgets(struct snd_soc_codec *codec) 7571cfc902SMark Brown { 76ce6120ccSLiam Girdwood struct snd_soc_dapm_context *dapm = &codec->dapm; 7771cfc902SMark Brown 78ce6120ccSLiam Girdwood snd_soc_dapm_new_controls(dapm, wm8728_dapm_widgets, 79ce6120ccSLiam Girdwood ARRAY_SIZE(wm8728_dapm_widgets)); 80ce6120ccSLiam Girdwood snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon)); 8171cfc902SMark Brown 8271cfc902SMark Brown return 0; 8371cfc902SMark Brown } 8471cfc902SMark Brown 8571cfc902SMark Brown static int wm8728_mute(struct snd_soc_dai *dai, int mute) 8671cfc902SMark Brown { 8771cfc902SMark Brown struct snd_soc_codec *codec = dai->codec; 8817a52fd6SMark Brown u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL); 8971cfc902SMark Brown 9071cfc902SMark Brown if (mute) 9117a52fd6SMark Brown snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1); 9271cfc902SMark Brown else 9317a52fd6SMark Brown snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1); 9471cfc902SMark Brown 9571cfc902SMark Brown return 0; 9671cfc902SMark Brown } 9771cfc902SMark Brown 9871cfc902SMark Brown static int wm8728_hw_params(struct snd_pcm_substream *substream, 99dee89c4dSMark Brown struct snd_pcm_hw_params *params, 100dee89c4dSMark Brown struct snd_soc_dai *dai) 10171cfc902SMark Brown { 10271cfc902SMark Brown struct snd_soc_pcm_runtime *rtd = substream->private_data; 103f0fba2adSLiam Girdwood struct snd_soc_codec *codec = rtd->codec; 10417a52fd6SMark Brown u16 dac = snd_soc_read(codec, WM8728_DACCTL); 10571cfc902SMark Brown 10671cfc902SMark Brown dac &= ~0x18; 10771cfc902SMark Brown 10871cfc902SMark Brown switch (params_format(params)) { 10971cfc902SMark Brown case SNDRV_PCM_FORMAT_S16_LE: 11071cfc902SMark Brown break; 11171cfc902SMark Brown case SNDRV_PCM_FORMAT_S20_3LE: 11271cfc902SMark Brown dac |= 0x10; 11371cfc902SMark Brown break; 11471cfc902SMark Brown case SNDRV_PCM_FORMAT_S24_LE: 11571cfc902SMark Brown dac |= 0x08; 11671cfc902SMark Brown break; 11771cfc902SMark Brown default: 11871cfc902SMark Brown return -EINVAL; 11971cfc902SMark Brown } 12071cfc902SMark Brown 12117a52fd6SMark Brown snd_soc_write(codec, WM8728_DACCTL, dac); 12271cfc902SMark Brown 12371cfc902SMark Brown return 0; 12471cfc902SMark Brown } 12571cfc902SMark Brown 12671cfc902SMark Brown static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai, 12771cfc902SMark Brown unsigned int fmt) 12871cfc902SMark Brown { 12971cfc902SMark Brown struct snd_soc_codec *codec = codec_dai->codec; 13017a52fd6SMark Brown u16 iface = snd_soc_read(codec, WM8728_IFCTL); 13171cfc902SMark Brown 13271cfc902SMark Brown /* Currently only I2S is supported by the driver, though the 13371cfc902SMark Brown * hardware is more flexible. 13471cfc902SMark Brown */ 13571cfc902SMark Brown switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 13671cfc902SMark Brown case SND_SOC_DAIFMT_I2S: 13771cfc902SMark Brown iface |= 1; 13871cfc902SMark Brown break; 13971cfc902SMark Brown default: 14071cfc902SMark Brown return -EINVAL; 14171cfc902SMark Brown } 14271cfc902SMark Brown 14371cfc902SMark Brown /* The hardware only support full slave mode */ 14471cfc902SMark Brown switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 14571cfc902SMark Brown case SND_SOC_DAIFMT_CBS_CFS: 14671cfc902SMark Brown break; 14771cfc902SMark Brown default: 14871cfc902SMark Brown return -EINVAL; 14971cfc902SMark Brown } 15071cfc902SMark Brown 15171cfc902SMark Brown switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 15271cfc902SMark Brown case SND_SOC_DAIFMT_NB_NF: 15371cfc902SMark Brown iface &= ~0x22; 15471cfc902SMark Brown break; 15571cfc902SMark Brown case SND_SOC_DAIFMT_IB_NF: 15671cfc902SMark Brown iface |= 0x20; 15771cfc902SMark Brown iface &= ~0x02; 15871cfc902SMark Brown break; 15971cfc902SMark Brown case SND_SOC_DAIFMT_NB_IF: 16071cfc902SMark Brown iface |= 0x02; 16171cfc902SMark Brown iface &= ~0x20; 16271cfc902SMark Brown break; 16371cfc902SMark Brown case SND_SOC_DAIFMT_IB_IF: 16471cfc902SMark Brown iface |= 0x22; 16571cfc902SMark Brown break; 16671cfc902SMark Brown default: 16771cfc902SMark Brown return -EINVAL; 16871cfc902SMark Brown } 16971cfc902SMark Brown 17017a52fd6SMark Brown snd_soc_write(codec, WM8728_IFCTL, iface); 17171cfc902SMark Brown return 0; 17271cfc902SMark Brown } 17371cfc902SMark Brown 17471cfc902SMark Brown static int wm8728_set_bias_level(struct snd_soc_codec *codec, 17571cfc902SMark Brown enum snd_soc_bias_level level) 17671cfc902SMark Brown { 17771cfc902SMark Brown u16 reg; 17871cfc902SMark Brown int i; 17971cfc902SMark Brown 18071cfc902SMark Brown switch (level) { 18171cfc902SMark Brown case SND_SOC_BIAS_ON: 18271cfc902SMark Brown case SND_SOC_BIAS_PREPARE: 18371cfc902SMark Brown case SND_SOC_BIAS_STANDBY: 184ce6120ccSLiam Girdwood if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) { 18571cfc902SMark Brown /* Power everything up... */ 18617a52fd6SMark Brown reg = snd_soc_read(codec, WM8728_DACCTL); 18717a52fd6SMark Brown snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4); 18871cfc902SMark Brown 18971cfc902SMark Brown /* ..then sync in the register cache. */ 19071cfc902SMark Brown for (i = 0; i < ARRAY_SIZE(wm8728_reg_defaults); i++) 19117a52fd6SMark Brown snd_soc_write(codec, i, 19217a52fd6SMark Brown snd_soc_read(codec, i)); 19371cfc902SMark Brown } 19471cfc902SMark Brown break; 19571cfc902SMark Brown 19671cfc902SMark Brown case SND_SOC_BIAS_OFF: 19717a52fd6SMark Brown reg = snd_soc_read(codec, WM8728_DACCTL); 19817a52fd6SMark Brown snd_soc_write(codec, WM8728_DACCTL, reg | 0x4); 19971cfc902SMark Brown break; 20071cfc902SMark Brown } 201ce6120ccSLiam Girdwood codec->dapm.bias_level = level; 20271cfc902SMark Brown return 0; 20371cfc902SMark Brown } 20471cfc902SMark Brown 20571cfc902SMark Brown #define WM8728_RATES (SNDRV_PCM_RATE_8000_192000) 20671cfc902SMark Brown 20771cfc902SMark Brown #define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\ 20871cfc902SMark Brown SNDRV_PCM_FMTBIT_S24_LE) 20971cfc902SMark Brown 2106335d055SEric Miao static struct snd_soc_dai_ops wm8728_dai_ops = { 2116335d055SEric Miao .hw_params = wm8728_hw_params, 2126335d055SEric Miao .digital_mute = wm8728_mute, 2136335d055SEric Miao .set_fmt = wm8728_set_dai_fmt, 2146335d055SEric Miao }; 2156335d055SEric Miao 216f0fba2adSLiam Girdwood static struct snd_soc_dai_driver wm8728_dai = { 217f0fba2adSLiam Girdwood .name = "wm8728-hifi", 21871cfc902SMark Brown .playback = { 21971cfc902SMark Brown .stream_name = "Playback", 22071cfc902SMark Brown .channels_min = 2, 22171cfc902SMark Brown .channels_max = 2, 22271cfc902SMark Brown .rates = WM8728_RATES, 22371cfc902SMark Brown .formats = WM8728_FORMATS, 22471cfc902SMark Brown }, 2256335d055SEric Miao .ops = &wm8728_dai_ops, 22671cfc902SMark Brown }; 22771cfc902SMark Brown 228f0fba2adSLiam Girdwood static int wm8728_suspend(struct snd_soc_codec *codec, pm_message_t state) 22971cfc902SMark Brown { 23071cfc902SMark Brown wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 23171cfc902SMark Brown 23271cfc902SMark Brown return 0; 23371cfc902SMark Brown } 23471cfc902SMark Brown 235f0fba2adSLiam Girdwood static int wm8728_resume(struct snd_soc_codec *codec) 23671cfc902SMark Brown { 23729e189c2SMark Brown wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 23871cfc902SMark Brown 23971cfc902SMark Brown return 0; 24071cfc902SMark Brown } 24171cfc902SMark Brown 242f0fba2adSLiam Girdwood static int wm8728_probe(struct snd_soc_codec *codec) 24371cfc902SMark Brown { 244f0fba2adSLiam Girdwood struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec); 245f0fba2adSLiam Girdwood int ret; 24671cfc902SMark Brown 247f0fba2adSLiam Girdwood ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8728->control_type); 24817a52fd6SMark Brown if (ret < 0) { 24917a52fd6SMark Brown printk(KERN_ERR "wm8728: failed to configure cache I/O: %d\n", 25017a52fd6SMark Brown ret); 251f0fba2adSLiam Girdwood return ret; 25271cfc902SMark Brown } 25371cfc902SMark Brown 25471cfc902SMark Brown /* power on device */ 25571cfc902SMark Brown wm8728_set_bias_level(codec, SND_SOC_BIAS_STANDBY); 25671cfc902SMark Brown 2573e8e1952SIan Molton snd_soc_add_controls(codec, wm8728_snd_controls, 2583e8e1952SIan Molton ARRAY_SIZE(wm8728_snd_controls)); 25971cfc902SMark Brown wm8728_add_widgets(codec); 26071cfc902SMark Brown 26171cfc902SMark Brown return ret; 26271cfc902SMark Brown } 26371cfc902SMark Brown 264f0fba2adSLiam Girdwood static int wm8728_remove(struct snd_soc_codec *codec) 26571cfc902SMark Brown { 266f0fba2adSLiam Girdwood wm8728_set_bias_level(codec, SND_SOC_BIAS_OFF); 267f0fba2adSLiam Girdwood return 0; 268f0fba2adSLiam Girdwood } 269f0fba2adSLiam Girdwood 270f0fba2adSLiam Girdwood static struct snd_soc_codec_driver soc_codec_dev_wm8728 = { 271f0fba2adSLiam Girdwood .probe = wm8728_probe, 272f0fba2adSLiam Girdwood .remove = wm8728_remove, 273f0fba2adSLiam Girdwood .suspend = wm8728_suspend, 274f0fba2adSLiam Girdwood .resume = wm8728_resume, 275f0fba2adSLiam Girdwood .set_bias_level = wm8728_set_bias_level, 276e5eec34cSDimitris Papastamos .reg_cache_size = ARRAY_SIZE(wm8728_reg_defaults), 277f0fba2adSLiam Girdwood .reg_word_size = sizeof(u16), 278f0fba2adSLiam Girdwood .reg_cache_default = wm8728_reg_defaults, 279f0fba2adSLiam Girdwood }; 280f0fba2adSLiam Girdwood 281f0fba2adSLiam Girdwood #if defined(CONFIG_SPI_MASTER) 282f0fba2adSLiam Girdwood static int __devinit wm8728_spi_probe(struct spi_device *spi) 283f0fba2adSLiam Girdwood { 284f0fba2adSLiam Girdwood struct wm8728_priv *wm8728; 28571cfc902SMark Brown int ret; 28671cfc902SMark Brown 287f0fba2adSLiam Girdwood wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL); 288f0fba2adSLiam Girdwood if (wm8728 == NULL) 289f0fba2adSLiam Girdwood return -ENOMEM; 29071cfc902SMark Brown 291f0fba2adSLiam Girdwood wm8728->control_type = SND_SOC_SPI; 292f0fba2adSLiam Girdwood spi_set_drvdata(spi, wm8728); 293f0fba2adSLiam Girdwood 294f0fba2adSLiam Girdwood ret = snd_soc_register_codec(&spi->dev, 295f0fba2adSLiam Girdwood &soc_codec_dev_wm8728, &wm8728_dai, 1); 29671cfc902SMark Brown if (ret < 0) 297f0fba2adSLiam Girdwood kfree(wm8728); 29871cfc902SMark Brown return ret; 29971cfc902SMark Brown } 30071cfc902SMark Brown 301f0fba2adSLiam Girdwood static int __devexit wm8728_spi_remove(struct spi_device *spi) 30271cfc902SMark Brown { 303f0fba2adSLiam Girdwood snd_soc_unregister_codec(&spi->dev); 304f0fba2adSLiam Girdwood kfree(spi_get_drvdata(spi)); 305f0fba2adSLiam Girdwood return 0; 306f0fba2adSLiam Girdwood } 307f0fba2adSLiam Girdwood 308f0fba2adSLiam Girdwood static struct spi_driver wm8728_spi_driver = { 309f0fba2adSLiam Girdwood .driver = { 310f0fba2adSLiam Girdwood .name = "wm8728-codec", 311f0fba2adSLiam Girdwood .owner = THIS_MODULE, 312f0fba2adSLiam Girdwood }, 313f0fba2adSLiam Girdwood .probe = wm8728_spi_probe, 314f0fba2adSLiam Girdwood .remove = __devexit_p(wm8728_spi_remove), 315f0fba2adSLiam Girdwood }; 316f0fba2adSLiam Girdwood #endif /* CONFIG_SPI_MASTER */ 317f0fba2adSLiam Girdwood 318f0fba2adSLiam Girdwood #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 319f0fba2adSLiam Girdwood static __devinit int wm8728_i2c_probe(struct i2c_client *i2c, 320f0fba2adSLiam Girdwood const struct i2c_device_id *id) 321f0fba2adSLiam Girdwood { 322f0fba2adSLiam Girdwood struct wm8728_priv *wm8728; 323f0fba2adSLiam Girdwood int ret; 324f0fba2adSLiam Girdwood 325f0fba2adSLiam Girdwood wm8728 = kzalloc(sizeof(struct wm8728_priv), GFP_KERNEL); 326f0fba2adSLiam Girdwood if (wm8728 == NULL) 327f0fba2adSLiam Girdwood return -ENOMEM; 328f0fba2adSLiam Girdwood 329f0fba2adSLiam Girdwood i2c_set_clientdata(i2c, wm8728); 330f0fba2adSLiam Girdwood wm8728->control_type = SND_SOC_I2C; 331f0fba2adSLiam Girdwood 332f0fba2adSLiam Girdwood ret = snd_soc_register_codec(&i2c->dev, 333f0fba2adSLiam Girdwood &soc_codec_dev_wm8728, &wm8728_dai, 1); 334f0fba2adSLiam Girdwood if (ret < 0) 335f0fba2adSLiam Girdwood kfree(wm8728); 336f0fba2adSLiam Girdwood return ret; 337f0fba2adSLiam Girdwood } 338f0fba2adSLiam Girdwood 339f0fba2adSLiam Girdwood static __devexit int wm8728_i2c_remove(struct i2c_client *client) 340f0fba2adSLiam Girdwood { 341f0fba2adSLiam Girdwood snd_soc_unregister_codec(&client->dev); 342f0fba2adSLiam Girdwood kfree(i2c_get_clientdata(client)); 34371cfc902SMark Brown return 0; 34471cfc902SMark Brown } 34571cfc902SMark Brown 34671cfc902SMark Brown static const struct i2c_device_id wm8728_i2c_id[] = { 34771cfc902SMark Brown { "wm8728", 0 }, 34871cfc902SMark Brown { } 34971cfc902SMark Brown }; 35071cfc902SMark Brown MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id); 35171cfc902SMark Brown 35271cfc902SMark Brown static struct i2c_driver wm8728_i2c_driver = { 35371cfc902SMark Brown .driver = { 354f0fba2adSLiam Girdwood .name = "wm8728-codec", 35571cfc902SMark Brown .owner = THIS_MODULE, 35671cfc902SMark Brown }, 35771cfc902SMark Brown .probe = wm8728_i2c_probe, 358f0fba2adSLiam Girdwood .remove = __devexit_p(wm8728_i2c_remove), 35971cfc902SMark Brown .id_table = wm8728_i2c_id, 36071cfc902SMark Brown }; 36171cfc902SMark Brown #endif 36271cfc902SMark Brown 363c9b3a40fSTakashi Iwai static int __init wm8728_modinit(void) 36464089b84SMark Brown { 365f0fba2adSLiam Girdwood int ret = 0; 366f0fba2adSLiam Girdwood #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 367f0fba2adSLiam Girdwood ret = i2c_add_driver(&wm8728_i2c_driver); 368f0fba2adSLiam Girdwood if (ret != 0) { 369f0fba2adSLiam Girdwood printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n", 370f0fba2adSLiam Girdwood ret); 371f0fba2adSLiam Girdwood } 372f0fba2adSLiam Girdwood #endif 373f0fba2adSLiam Girdwood #if defined(CONFIG_SPI_MASTER) 374f0fba2adSLiam Girdwood ret = spi_register_driver(&wm8728_spi_driver); 375f0fba2adSLiam Girdwood if (ret != 0) { 376f0fba2adSLiam Girdwood printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n", 377f0fba2adSLiam Girdwood ret); 378f0fba2adSLiam Girdwood } 379f0fba2adSLiam Girdwood #endif 380f0fba2adSLiam Girdwood return ret; 38164089b84SMark Brown } 38264089b84SMark Brown module_init(wm8728_modinit); 38364089b84SMark Brown 38464089b84SMark Brown static void __exit wm8728_exit(void) 38564089b84SMark Brown { 386f0fba2adSLiam Girdwood #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) 387f0fba2adSLiam Girdwood i2c_del_driver(&wm8728_i2c_driver); 388f0fba2adSLiam Girdwood #endif 389f0fba2adSLiam Girdwood #if defined(CONFIG_SPI_MASTER) 390f0fba2adSLiam Girdwood spi_unregister_driver(&wm8728_spi_driver); 391f0fba2adSLiam Girdwood #endif 39264089b84SMark Brown } 39364089b84SMark Brown module_exit(wm8728_exit); 39464089b84SMark Brown 39571cfc902SMark Brown MODULE_DESCRIPTION("ASoC WM8728 driver"); 39671cfc902SMark Brown MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 39771cfc902SMark Brown MODULE_LICENSE("GPL"); 398