linux_dsm_epyc7002/sound/soc/codecs/wm8804.c
Lars-Peter Clausen e755603768 ASoC: wm8804: Replace direct snd_soc_codec dapm field access
The dapm field of the snd_soc_codec struct is eventually going to be
removed, in preparation for this replace all manual access to codec->dapm
with snd_soc_codec_get_dapm().

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-01 16:43:37 +01:00

732 lines
18 KiB
C

/*
* wm8804.c -- WM8804 S/PDIF transceiver driver
*
* Copyright 2010-11 Wolfson Microelectronics plc
*
* Author: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
*
* 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/init.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <sound/soc-dapm.h>
#include "wm8804.h"
#define WM8804_NUM_SUPPLIES 2
static const char *wm8804_supply_names[WM8804_NUM_SUPPLIES] = {
"PVDD",
"DVDD"
};
static const struct reg_default wm8804_reg_defaults[] = {
{ 3, 0x21 }, /* R3 - PLL1 */
{ 4, 0xFD }, /* R4 - PLL2 */
{ 5, 0x36 }, /* R5 - PLL3 */
{ 6, 0x07 }, /* R6 - PLL4 */
{ 7, 0x16 }, /* R7 - PLL5 */
{ 8, 0x18 }, /* R8 - PLL6 */
{ 9, 0xFF }, /* R9 - SPDMODE */
{ 10, 0x00 }, /* R10 - INTMASK */
{ 18, 0x00 }, /* R18 - SPDTX1 */
{ 19, 0x00 }, /* R19 - SPDTX2 */
{ 20, 0x00 }, /* R20 - SPDTX3 */
{ 21, 0x71 }, /* R21 - SPDTX4 */
{ 22, 0x0B }, /* R22 - SPDTX5 */
{ 23, 0x70 }, /* R23 - GPO0 */
{ 24, 0x57 }, /* R24 - GPO1 */
{ 26, 0x42 }, /* R26 - GPO2 */
{ 27, 0x06 }, /* R27 - AIFTX */
{ 28, 0x06 }, /* R28 - AIFRX */
{ 29, 0x80 }, /* R29 - SPDRX1 */
{ 30, 0x07 }, /* R30 - PWRDN */
};
struct wm8804_priv {
struct device *dev;
struct regmap *regmap;
struct regulator_bulk_data supplies[WM8804_NUM_SUPPLIES];
struct notifier_block disable_nb[WM8804_NUM_SUPPLIES];
int mclk_div;
struct gpio_desc *reset;
int aif_pwr;
};
static int txsrc_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol);
static int wm8804_aif_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event);
/*
* We can't use the same notifier block for more than one supply and
* there's no way I can see to get from a callback to the caller
* except container_of().
*/
#define WM8804_REGULATOR_EVENT(n) \
static int wm8804_regulator_event_##n(struct notifier_block *nb, \
unsigned long event, void *data) \
{ \
struct wm8804_priv *wm8804 = container_of(nb, struct wm8804_priv, \
disable_nb[n]); \
if (event & REGULATOR_EVENT_DISABLE) { \
regcache_mark_dirty(wm8804->regmap); \
} \
return 0; \
}
WM8804_REGULATOR_EVENT(0)
WM8804_REGULATOR_EVENT(1)
static const char *txsrc_text[] = { "S/PDIF RX", "AIF" };
static const SOC_ENUM_SINGLE_DECL(txsrc, WM8804_SPDTX4, 6, txsrc_text);
static const struct snd_kcontrol_new wm8804_tx_source_mux[] = {
SOC_DAPM_ENUM_EXT("Input Source", txsrc,
snd_soc_dapm_get_enum_double, txsrc_put),
};
static const struct snd_soc_dapm_widget wm8804_dapm_widgets[] = {
SND_SOC_DAPM_OUTPUT("SPDIF Out"),
SND_SOC_DAPM_INPUT("SPDIF In"),
SND_SOC_DAPM_PGA("SPDIFTX", WM8804_PWRDN, 2, 1, NULL, 0),
SND_SOC_DAPM_PGA("SPDIFRX", WM8804_PWRDN, 1, 1, NULL, 0),
SND_SOC_DAPM_MUX("Tx Source", SND_SOC_NOPM, 6, 0, wm8804_tx_source_mux),
SND_SOC_DAPM_AIF_OUT_E("AIFTX", NULL, 0, SND_SOC_NOPM, 0, 0, wm8804_aif_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
SND_SOC_DAPM_AIF_IN_E("AIFRX", NULL, 0, SND_SOC_NOPM, 0, 0, wm8804_aif_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_POST_PMD),
};
static const struct snd_soc_dapm_route wm8804_dapm_routes[] = {
{ "AIFRX", NULL, "Playback" },
{ "Tx Source", "AIF", "AIFRX" },
{ "SPDIFRX", NULL, "SPDIF In" },
{ "Tx Source", "S/PDIF RX", "SPDIFRX" },
{ "SPDIFTX", NULL, "Tx Source" },
{ "SPDIF Out", NULL, "SPDIFTX" },
{ "AIFTX", NULL, "SPDIFRX" },
{ "Capture", NULL, "AIFTX" },
};
static int wm8804_aif_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
struct snd_soc_codec *codec = snd_soc_dapm_to_codec(w->dapm);
struct wm8804_priv *wm8804 = snd_soc_codec_get_drvdata(codec);
switch (event) {
case SND_SOC_DAPM_POST_PMU:
/* power up the aif */
if (!wm8804->aif_pwr)
snd_soc_update_bits(codec, WM8804_PWRDN, 0x10, 0x0);
wm8804->aif_pwr++;
break;
case SND_SOC_DAPM_POST_PMD:
/* power down only both paths are disabled */
wm8804->aif_pwr--;
if (!wm8804->aif_pwr)
snd_soc_update_bits(codec, WM8804_PWRDN, 0x10, 0x10);
break;
}
return 0;
}
static int txsrc_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_soc_dapm_kcontrol_codec(kcontrol);
struct snd_soc_dapm_context *dapm = snd_soc_codec_get_dapm(codec);
struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
unsigned int val = ucontrol->value.enumerated.item[0] << e->shift_l;
unsigned int mask = 1 << e->shift_l;
unsigned int txpwr;
if (val != 0 && val != mask)
return -EINVAL;
snd_soc_dapm_mutex_lock(dapm);
if (snd_soc_test_bits(codec, e->reg, mask, val)) {
/* save the current power state of the transmitter */
txpwr = snd_soc_read(codec, WM8804_PWRDN) & 0x4;
/* power down the transmitter */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, 0x4);
/* set the tx source */
snd_soc_update_bits(codec, e->reg, mask, val);
/* restore the transmitter's configuration */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, txpwr);
}
snd_soc_dapm_mutex_unlock(dapm);
return 0;
}
static bool wm8804_volatile(struct device *dev, unsigned int reg)
{
switch (reg) {
case WM8804_RST_DEVID1:
case WM8804_DEVID2:
case WM8804_DEVREV:
case WM8804_INTSTAT:
case WM8804_SPDSTAT:
case WM8804_RXCHAN1:
case WM8804_RXCHAN2:
case WM8804_RXCHAN3:
case WM8804_RXCHAN4:
case WM8804_RXCHAN5:
return true;
default:
return false;
}
}
static int wm8804_soft_reset(struct wm8804_priv *wm8804)
{
return regmap_write(wm8804->regmap, WM8804_RST_DEVID1, 0x0);
}
static int wm8804_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct snd_soc_codec *codec;
u16 format, master, bcp, lrp;
codec = dai->codec;
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
format = 0x2;
break;
case SND_SOC_DAIFMT_RIGHT_J:
format = 0x0;
break;
case SND_SOC_DAIFMT_LEFT_J:
format = 0x1;
break;
case SND_SOC_DAIFMT_DSP_A:
case SND_SOC_DAIFMT_DSP_B:
format = 0x3;
break;
default:
dev_err(dai->dev, "Unknown dai format\n");
return -EINVAL;
}
/* set data format */
snd_soc_update_bits(codec, WM8804_AIFTX, 0x3, format);
snd_soc_update_bits(codec, WM8804_AIFRX, 0x3, format);
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
master = 1;
break;
case SND_SOC_DAIFMT_CBS_CFS:
master = 0;
break;
default:
dev_err(dai->dev, "Unknown master/slave configuration\n");
return -EINVAL;
}
/* set master/slave mode */
snd_soc_update_bits(codec, WM8804_AIFRX, 0x40, master << 6);
bcp = lrp = 0;
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
case SND_SOC_DAIFMT_IB_IF:
bcp = lrp = 1;
break;
case SND_SOC_DAIFMT_IB_NF:
bcp = 1;
break;
case SND_SOC_DAIFMT_NB_IF:
lrp = 1;
break;
default:
dev_err(dai->dev, "Unknown polarity configuration\n");
return -EINVAL;
}
/* set frame inversion */
snd_soc_update_bits(codec, WM8804_AIFTX, 0x10 | 0x20,
(bcp << 4) | (lrp << 5));
snd_soc_update_bits(codec, WM8804_AIFRX, 0x10 | 0x20,
(bcp << 4) | (lrp << 5));
return 0;
}
static int wm8804_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_codec *codec;
u16 blen;
codec = dai->codec;
switch (params_width(params)) {
case 16:
blen = 0x0;
break;
case 20:
blen = 0x1;
break;
case 24:
blen = 0x2;
break;
default:
dev_err(dai->dev, "Unsupported word length: %u\n",
params_width(params));
return -EINVAL;
}
/* set word length */
snd_soc_update_bits(codec, WM8804_AIFTX, 0xc, blen << 2);
snd_soc_update_bits(codec, WM8804_AIFRX, 0xc, blen << 2);
return 0;
}
struct pll_div {
u32 prescale:1;
u32 mclkdiv:1;
u32 freqmode:2;
u32 n:4;
u32 k:22;
};
/* PLL rate to output rate divisions */
static struct {
unsigned int div;
unsigned int freqmode;
unsigned int mclkdiv;
} post_table[] = {
{ 2, 0, 0 },
{ 4, 0, 1 },
{ 4, 1, 0 },
{ 8, 1, 1 },
{ 8, 2, 0 },
{ 16, 2, 1 },
{ 12, 3, 0 },
{ 24, 3, 1 }
};
#define FIXED_PLL_SIZE ((1ULL << 22) * 10)
static int pll_factors(struct pll_div *pll_div, unsigned int target,
unsigned int source, unsigned int mclk_div)
{
u64 Kpart;
unsigned long int K, Ndiv, Nmod, tmp;
int i;
/*
* Scale the output frequency up; the PLL should run in the
* region of 90-100MHz.
*/
for (i = 0; i < ARRAY_SIZE(post_table); i++) {
tmp = target * post_table[i].div;
if ((tmp >= 90000000 && tmp <= 100000000) &&
(mclk_div == post_table[i].mclkdiv)) {
pll_div->freqmode = post_table[i].freqmode;
pll_div->mclkdiv = post_table[i].mclkdiv;
target *= post_table[i].div;
break;
}
}
if (i == ARRAY_SIZE(post_table)) {
pr_err("%s: Unable to scale output frequency: %uHz\n",
__func__, target);
return -EINVAL;
}
pll_div->prescale = 0;
Ndiv = target / source;
if (Ndiv < 5) {
source >>= 1;
pll_div->prescale = 1;
Ndiv = target / source;
}
if (Ndiv < 5 || Ndiv > 13) {
pr_err("%s: WM8804 N value is not within the recommended range: %lu\n",
__func__, Ndiv);
return -EINVAL;
}
pll_div->n = Ndiv;
Nmod = target % source;
Kpart = FIXED_PLL_SIZE * (u64)Nmod;
do_div(Kpart, source);
K = Kpart & 0xffffffff;
if ((K % 10) >= 5)
K += 5;
K /= 10;
pll_div->k = K;
return 0;
}
static int wm8804_set_pll(struct snd_soc_dai *dai, int pll_id,
int source, unsigned int freq_in,
unsigned int freq_out)
{
struct snd_soc_codec *codec = dai->codec;
struct wm8804_priv *wm8804 = snd_soc_codec_get_drvdata(codec);
bool change;
if (!freq_in || !freq_out) {
/* disable the PLL */
regmap_update_bits_check(wm8804->regmap, WM8804_PWRDN,
0x1, 0x1, &change);
if (change)
pm_runtime_put(wm8804->dev);
} else {
int ret;
struct pll_div pll_div;
ret = pll_factors(&pll_div, freq_out, freq_in,
wm8804->mclk_div);
if (ret)
return ret;
/* power down the PLL before reprogramming it */
regmap_update_bits_check(wm8804->regmap, WM8804_PWRDN,
0x1, 0x1, &change);
if (!change)
pm_runtime_get_sync(wm8804->dev);
/* set PLLN and PRESCALE */
snd_soc_update_bits(codec, WM8804_PLL4, 0xf | 0x10,
pll_div.n | (pll_div.prescale << 4));
/* set mclkdiv and freqmode */
snd_soc_update_bits(codec, WM8804_PLL5, 0x3 | 0x8,
pll_div.freqmode | (pll_div.mclkdiv << 3));
/* set PLLK */
snd_soc_write(codec, WM8804_PLL1, pll_div.k & 0xff);
snd_soc_write(codec, WM8804_PLL2, (pll_div.k >> 8) & 0xff);
snd_soc_write(codec, WM8804_PLL3, pll_div.k >> 16);
/* power up the PLL */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0);
}
return 0;
}
static int wm8804_set_sysclk(struct snd_soc_dai *dai,
int clk_id, unsigned int freq, int dir)
{
struct snd_soc_codec *codec;
codec = dai->codec;
switch (clk_id) {
case WM8804_TX_CLKSRC_MCLK:
if ((freq >= 10000000 && freq <= 14400000)
|| (freq >= 16280000 && freq <= 27000000))
snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0x80);
else {
dev_err(dai->dev, "OSCCLOCK is not within the "
"recommended range: %uHz\n", freq);
return -EINVAL;
}
break;
case WM8804_TX_CLKSRC_PLL:
snd_soc_update_bits(codec, WM8804_PLL6, 0x80, 0);
break;
case WM8804_CLKOUT_SRC_CLK1:
snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0);
break;
case WM8804_CLKOUT_SRC_OSCCLK:
snd_soc_update_bits(codec, WM8804_PLL6, 0x8, 0x8);
break;
default:
dev_err(dai->dev, "Unknown clock source: %d\n", clk_id);
return -EINVAL;
}
return 0;
}
static int wm8804_set_clkdiv(struct snd_soc_dai *dai,
int div_id, int div)
{
struct snd_soc_codec *codec;
struct wm8804_priv *wm8804;
codec = dai->codec;
switch (div_id) {
case WM8804_CLKOUT_DIV:
snd_soc_update_bits(codec, WM8804_PLL5, 0x30,
(div & 0x3) << 4);
break;
case WM8804_MCLK_DIV:
wm8804 = snd_soc_codec_get_drvdata(codec);
wm8804->mclk_div = div;
break;
default:
dev_err(dai->dev, "Unknown clock divider: %d\n", div_id);
return -EINVAL;
}
return 0;
}
static const struct snd_soc_dai_ops wm8804_dai_ops = {
.hw_params = wm8804_hw_params,
.set_fmt = wm8804_set_fmt,
.set_sysclk = wm8804_set_sysclk,
.set_clkdiv = wm8804_set_clkdiv,
.set_pll = wm8804_set_pll
};
#define WM8804_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
SNDRV_PCM_FMTBIT_S24_LE)
#define WM8804_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \
SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | \
SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000)
static struct snd_soc_dai_driver wm8804_dai = {
.name = "wm8804-spdif",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = WM8804_RATES,
.formats = WM8804_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 2,
.rates = WM8804_RATES,
.formats = WM8804_FORMATS,
},
.ops = &wm8804_dai_ops,
.symmetric_rates = 1
};
static const struct snd_soc_codec_driver soc_codec_dev_wm8804 = {
.idle_bias_off = true,
.dapm_widgets = wm8804_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm8804_dapm_widgets),
.dapm_routes = wm8804_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(wm8804_dapm_routes),
};
const struct regmap_config wm8804_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = WM8804_MAX_REGISTER,
.volatile_reg = wm8804_volatile,
.cache_type = REGCACHE_RBTREE,
.reg_defaults = wm8804_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(wm8804_reg_defaults),
};
EXPORT_SYMBOL_GPL(wm8804_regmap_config);
int wm8804_probe(struct device *dev, struct regmap *regmap)
{
struct wm8804_priv *wm8804;
unsigned int id1, id2;
int i, ret;
wm8804 = devm_kzalloc(dev, sizeof(*wm8804), GFP_KERNEL);
if (!wm8804)
return -ENOMEM;
dev_set_drvdata(dev, wm8804);
wm8804->dev = dev;
wm8804->regmap = regmap;
wm8804->reset = devm_gpiod_get_optional(dev, "wlf,reset",
GPIOD_OUT_LOW);
if (IS_ERR(wm8804->reset)) {
ret = PTR_ERR(wm8804->reset);
dev_err(dev, "Failed to get reset line: %d\n", ret);
return ret;
}
for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++)
wm8804->supplies[i].supply = wm8804_supply_names[i];
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
if (ret) {
dev_err(dev, "Failed to request supplies: %d\n", ret);
return ret;
}
wm8804->disable_nb[0].notifier_call = wm8804_regulator_event_0;
wm8804->disable_nb[1].notifier_call = wm8804_regulator_event_1;
/* This should really be moved into the regulator core */
for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++) {
struct regulator *regulator = wm8804->supplies[i].consumer;
ret = devm_regulator_register_notifier(regulator,
&wm8804->disable_nb[i]);
if (ret != 0) {
dev_err(dev,
"Failed to register regulator notifier: %d\n",
ret);
return ret;
}
}
ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
if (ret) {
dev_err(dev, "Failed to enable supplies: %d\n", ret);
return ret;
}
if (wm8804->reset)
gpiod_set_value_cansleep(wm8804->reset, 1);
ret = regmap_read(regmap, WM8804_RST_DEVID1, &id1);
if (ret < 0) {
dev_err(dev, "Failed to read device ID: %d\n", ret);
goto err_reg_enable;
}
ret = regmap_read(regmap, WM8804_DEVID2, &id2);
if (ret < 0) {
dev_err(dev, "Failed to read device ID: %d\n", ret);
goto err_reg_enable;
}
id2 = (id2 << 8) | id1;
if (id2 != 0x8805) {
dev_err(dev, "Invalid device ID: %#x\n", id2);
ret = -EINVAL;
goto err_reg_enable;
}
ret = regmap_read(regmap, WM8804_DEVREV, &id1);
if (ret < 0) {
dev_err(dev, "Failed to read device revision: %d\n",
ret);
goto err_reg_enable;
}
dev_info(dev, "revision %c\n", id1 + 'A');
if (!wm8804->reset) {
ret = wm8804_soft_reset(wm8804);
if (ret < 0) {
dev_err(dev, "Failed to issue reset: %d\n", ret);
goto err_reg_enable;
}
}
ret = snd_soc_register_codec(dev, &soc_codec_dev_wm8804,
&wm8804_dai, 1);
if (ret < 0) {
dev_err(dev, "Failed to register CODEC: %d\n", ret);
goto err_reg_enable;
}
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_idle(dev);
return 0;
err_reg_enable:
regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
return ret;
}
EXPORT_SYMBOL_GPL(wm8804_probe);
void wm8804_remove(struct device *dev)
{
pm_runtime_disable(dev);
snd_soc_unregister_codec(dev);
}
EXPORT_SYMBOL_GPL(wm8804_remove);
#if IS_ENABLED(CONFIG_PM)
static int wm8804_runtime_resume(struct device *dev)
{
struct wm8804_priv *wm8804 = dev_get_drvdata(dev);
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
if (ret) {
dev_err(wm8804->dev, "Failed to enable supplies: %d\n", ret);
return ret;
}
regcache_sync(wm8804->regmap);
/* Power up OSCCLK */
regmap_update_bits(wm8804->regmap, WM8804_PWRDN, 0x8, 0x0);
return 0;
}
static int wm8804_runtime_suspend(struct device *dev)
{
struct wm8804_priv *wm8804 = dev_get_drvdata(dev);
/* Power down OSCCLK */
regmap_update_bits(wm8804->regmap, WM8804_PWRDN, 0x8, 0x8);
regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
return 0;
}
#endif
const struct dev_pm_ops wm8804_pm = {
SET_RUNTIME_PM_OPS(wm8804_runtime_suspend, wm8804_runtime_resume, NULL)
};
EXPORT_SYMBOL_GPL(wm8804_pm);
MODULE_DESCRIPTION("ASoC WM8804 driver");
MODULE_AUTHOR("Dimitris Papastamos <dp@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");