/*
* wm8804.c -- WM8804 S/PDIF transceiver driver
*
* Copyright 2010 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/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/spi/spi.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 "wm8804.h"
#define WM8804_NUM_SUPPLIES 2
static const char *wm8804_supply_names[WM8804_NUM_SUPPLIES] = {
"PVDD",
"DVDD"
};
static const u8 wm8804_reg_defs[] = {
0x05, /* R0 - RST/DEVID1 */
0x88, /* R1 - DEVID2 */
0x04, /* R2 - DEVREV */
0x21, /* R3 - PLL1 */
0xFD, /* R4 - PLL2 */
0x36, /* R5 - PLL3 */
0x07, /* R6 - PLL4 */
0x16, /* R7 - PLL5 */
0x18, /* R8 - PLL6 */
0xFF, /* R9 - SPDMODE */
0x00, /* R10 - INTMASK */
0x00, /* R11 - INTSTAT */
0x00, /* R12 - SPDSTAT */
0x00, /* R13 - RXCHAN1 */
0x00, /* R14 - RXCHAN2 */
0x00, /* R15 - RXCHAN3 */
0x00, /* R16 - RXCHAN4 */
0x00, /* R17 - RXCHAN5 */
0x00, /* R18 - SPDTX1 */
0x00, /* R19 - SPDTX2 */
0x00, /* R20 - SPDTX3 */
0x71, /* R21 - SPDTX4 */
0x0B, /* R22 - SPDTX5 */
0x70, /* R23 - GPO0 */
0x57, /* R24 - GPO1 */
0x00, /* R25 */
0x42, /* R26 - GPO2 */
0x06, /* R27 - AIFTX */
0x06, /* R28 - AIFRX */
0x80, /* R29 - SPDRX1 */
0x07, /* R30 - PWRDN */
};
struct wm8804_priv {
enum snd_soc_control_type control_type;
struct regulator_bulk_data supplies[WM8804_NUM_SUPPLIES];
struct notifier_block disable_nb[WM8804_NUM_SUPPLIES];
struct snd_soc_codec *codec;
};
static int txsrc_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol);
static int txsrc_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol);
/*
* 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) { \
wm8804->codec->cache_sync = 1; \
} \
return 0; \
}
WM8804_REGULATOR_EVENT(0)
WM8804_REGULATOR_EVENT(1)
static const char *txsrc_text[] = { "S/PDIF RX", "AIF" };
static const SOC_ENUM_SINGLE_EXT_DECL(txsrc, txsrc_text);
static const struct snd_kcontrol_new wm8804_snd_controls[] = {
SOC_ENUM_EXT("Input Source", txsrc, txsrc_get, txsrc_put),
SOC_SINGLE("TX Playback Switch", WM8804_PWRDN, 2, 1, 1),
SOC_SINGLE("AIF Playback Switch", WM8804_PWRDN, 4, 1, 1)
};
static int txsrc_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec;
unsigned int src;
codec = snd_kcontrol_chip(kcontrol);
src = snd_soc_read(codec, WM8804_SPDTX4);
if (src & 0x40)
ucontrol->value.integer.value[0] = 1;
else
ucontrol->value.integer.value[0] = 0;
return 0;
}
static int txsrc_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec;
unsigned int src, txpwr;
codec = snd_kcontrol_chip(kcontrol);
if (ucontrol->value.integer.value[0] != 0
&& ucontrol->value.integer.value[0] != 1)
return -EINVAL;
src = snd_soc_read(codec, WM8804_SPDTX4);
switch ((src & 0x40) >> 6) {
case 0:
if (!ucontrol->value.integer.value[0])
return 0;
break;
case 1:
if (ucontrol->value.integer.value[1])
return 0;
break;
}
/* 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, WM8804_SPDTX4, 0x40,
ucontrol->value.integer.value[0] << 6);
if (ucontrol->value.integer.value[0]) {
/* power down the receiver */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0x2);
/* power up the AIF */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x10, 0);
} else {
/* don't power down the AIF -- may be used as an output */
/* power up the receiver */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x2, 0);
}
/* restore the transmitter's configuration */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x4, txpwr);
return 0;
}
static int wm8804_volatile(struct snd_soc_codec *codec, 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 1;
default:
break;
}
return 0;
}
static int wm8804_reset(struct snd_soc_codec *codec)
{
return snd_soc_write(codec, 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_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
blen = 0x0;
break;
case SNDRV_PCM_FORMAT_S20_3LE:
blen = 0x1;
break;
case SNDRV_PCM_FORMAT_S24_LE:
blen = 0x2;
break;
default:
dev_err(dai->dev, "Unsupported word length: %u\n",
params_format(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)
{
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) {
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;
codec = dai->codec;
if (!freq_in || !freq_out) {
/* disable the PLL */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);
return 0;
} else {
int ret;
struct pll_div pll_div;
ret = pll_factors(&pll_div, freq_out, freq_in);
if (ret)
return ret;
/* power down the PLL before reprogramming it */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x1, 0x1);
if (!freq_in || !freq_out)
return 0;
/* 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;
codec = dai->codec;
switch (div_id) {
case WM8804_CLKOUT_DIV:
snd_soc_update_bits(codec, WM8804_PLL5, 0x30,
(div & 0x3) << 4);
break;
default:
dev_err(dai->dev, "Unknown clock divider: %d\n", div_id);
return -EINVAL;
}
return 0;
}
static void wm8804_sync_cache(struct snd_soc_codec *codec)
{
short i;
u8 *cache;
if (!codec->cache_sync)
return;
codec->cache_only = 0;
cache = codec->reg_cache;
for (i = 0; i < codec->driver->reg_cache_size; i++) {
if (i == WM8804_RST_DEVID1 || cache[i] == wm8804_reg_defs[i])
continue;
snd_soc_write(codec, i, cache[i]);
}
codec->cache_sync = 0;
}
static int wm8804_set_bias_level(struct snd_soc_codec *codec,
enum snd_soc_bias_level level)
{
int ret;
struct wm8804_priv *wm8804;
wm8804 = snd_soc_codec_get_drvdata(codec);
switch (level) {
case SND_SOC_BIAS_ON:
break;
case SND_SOC_BIAS_PREPARE:
/* power up the OSC and the PLL */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0);
break;
case SND_SOC_BIAS_STANDBY:
if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
if (ret) {
dev_err(codec->dev,
"Failed to enable supplies: %d\n",
ret);
return ret;
}
wm8804_sync_cache(codec);
}
/* power down the OSC and the PLL */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
break;
case SND_SOC_BIAS_OFF:
/* power down the OSC and the PLL */
snd_soc_update_bits(codec, WM8804_PWRDN, 0x9, 0x9);
regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
break;
}
codec->dapm.bias_level = level;
return 0;
}
#ifdef CONFIG_PM
static int wm8804_suspend(struct snd_soc_codec *codec, pm_message_t state)
{
wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);
return 0;
}
static int wm8804_resume(struct snd_soc_codec *codec)
{
wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
return 0;
}
#else
#define wm8804_suspend NULL
#define wm8804_resume NULL
#endif
static int wm8804_remove(struct snd_soc_codec *codec)
{
struct wm8804_priv *wm8804;
int i;
wm8804 = snd_soc_codec_get_drvdata(codec);
wm8804_set_bias_level(codec, SND_SOC_BIAS_OFF);
for (i = 0; i < ARRAY_SIZE(wm8804->supplies); ++i)
regulator_unregister_notifier(wm8804->supplies[i].consumer,
&wm8804->disable_nb[i]);
regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
return 0;
}
static int wm8804_probe(struct snd_soc_codec *codec)
{
struct wm8804_priv *wm8804;
int i, id1, id2, ret;
wm8804 = snd_soc_codec_get_drvdata(codec);
wm8804->codec = codec;
codec->dapm.idle_bias_off = 1;
ret = snd_soc_codec_set_cache_io(codec, 8, 8, wm8804->control_type);
if (ret < 0) {
dev_err(codec->dev, "Failed to set cache i/o: %d\n", ret);
return ret;
}
for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++)
wm8804->supplies[i].supply = wm8804_supply_names[i];
ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
if (ret) {
dev_err(codec->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++) {
ret = regulator_register_notifier(wm8804->supplies[i].consumer,
&wm8804->disable_nb[i]);
if (ret != 0) {
dev_err(codec->dev,
"Failed to register regulator notifier: %d\n",
ret);
}
}
ret = regulator_bulk_enable(ARRAY_SIZE(wm8804->supplies),
wm8804->supplies);
if (ret) {
dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
goto err_reg_get;
}
id1 = snd_soc_read(codec, WM8804_RST_DEVID1);
if (id1 < 0) {
dev_err(codec->dev, "Failed to read device ID: %d\n", id1);
ret = id1;
goto err_reg_enable;
}
id2 = snd_soc_read(codec, WM8804_DEVID2);
if (id2 < 0) {
dev_err(codec->dev, "Failed to read device ID: %d\n", id2);
ret = id2;
goto err_reg_enable;
}
id2 = (id2 << 8) | id1;
if (id2 != ((wm8804_reg_defs[WM8804_DEVID2] << 8)
| wm8804_reg_defs[WM8804_RST_DEVID1])) {
dev_err(codec->dev, "Invalid device ID: %#x\n", id2);
ret = -EINVAL;
goto err_reg_enable;
}
ret = snd_soc_read(codec, WM8804_DEVREV);
if (ret < 0) {
dev_err(codec->dev, "Failed to read device revision: %d\n",
ret);
goto err_reg_enable;
}
dev_info(codec->dev, "revision %c\n", ret + 'A');
ret = wm8804_reset(codec);
if (ret < 0) {
dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
goto err_reg_enable;
}
wm8804_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
snd_soc_add_controls(codec, wm8804_snd_controls,
ARRAY_SIZE(wm8804_snd_controls));
return 0;
err_reg_enable:
regulator_bulk_disable(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
err_reg_get:
regulator_bulk_free(ARRAY_SIZE(wm8804->supplies), wm8804->supplies);
return ret;
}
static 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)
static struct snd_soc_dai_driver wm8804_dai = {
.name = "wm8804-spdif",
.playback = {
.stream_name = "Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = WM8804_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_192000,
.formats = WM8804_FORMATS,
},
.ops = &wm8804_dai_ops,
.symmetric_rates = 1
};
static struct snd_soc_codec_driver soc_codec_dev_wm8804 = {
.probe = wm8804_probe,
.remove = wm8804_remove,
.suspend = wm8804_suspend,
.resume = wm8804_resume,
.set_bias_level = wm8804_set_bias_level,
.reg_cache_size = ARRAY_SIZE(wm8804_reg_defs),
.reg_word_size = sizeof(u8),
.reg_cache_default = wm8804_reg_defs,
.volatile_register = wm8804_volatile
};
#if defined(CONFIG_SPI_MASTER)
static int __devinit wm8804_spi_probe(struct spi_device *spi)
{
struct wm8804_priv *wm8804;
int ret;
wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
if (!wm8804)
return -ENOMEM;
wm8804->control_type = SND_SOC_SPI;
spi_set_drvdata(spi, wm8804);
ret = snd_soc_register_codec(&spi->dev,
&soc_codec_dev_wm8804, &wm8804_dai, 1);
if (ret < 0)
kfree(wm8804);
return ret;
}
static int __devexit wm8804_spi_remove(struct spi_device *spi)
{
snd_soc_unregister_codec(&spi->dev);
kfree(spi_get_drvdata(spi));
return 0;
}
static struct spi_driver wm8804_spi_driver = {
.driver = {
.name = "wm8804",
.owner = THIS_MODULE,
},
.probe = wm8804_spi_probe,
.remove = __devexit_p(wm8804_spi_remove)
};
#endif
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static __devinit int wm8804_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8804_priv *wm8804;
int ret;
wm8804 = kzalloc(sizeof *wm8804, GFP_KERNEL);
if (!wm8804)
return -ENOMEM;
wm8804->control_type = SND_SOC_I2C;
i2c_set_clientdata(i2c, wm8804);
ret = snd_soc_register_codec(&i2c->dev,
&soc_codec_dev_wm8804, &wm8804_dai, 1);
if (ret < 0)
kfree(wm8804);
return ret;
}
static __devexit int wm8804_i2c_remove(struct i2c_client *client)
{
snd_soc_unregister_codec(&client->dev);
kfree(i2c_get_clientdata(client));
return 0;
}
static const struct i2c_device_id wm8804_i2c_id[] = {
{ "wm8804", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8804_i2c_id);
static struct i2c_driver wm8804_i2c_driver = {
.driver = {
.name = "wm8804",
.owner = THIS_MODULE,
},
.probe = wm8804_i2c_probe,
.remove = __devexit_p(wm8804_i2c_remove),
.id_table = wm8804_i2c_id
};
#endif
static int __init wm8804_modinit(void)
{
int ret = 0;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
ret = i2c_add_driver(&wm8804_i2c_driver);
if (ret) {
printk(KERN_ERR "Failed to register wm8804 I2C driver: %d\n",
ret);
}
#endif
#if defined(CONFIG_SPI_MASTER)
ret = spi_register_driver(&wm8804_spi_driver);
if (ret != 0) {
printk(KERN_ERR "Failed to register wm8804 SPI driver: %d\n",
ret);
}
#endif
return ret;
}
module_init(wm8804_modinit);
static void __exit wm8804_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
i2c_del_driver(&wm8804_i2c_driver);
#endif
#if defined(CONFIG_SPI_MASTER)
spi_unregister_driver(&wm8804_spi_driver);
#endif
}
module_exit(wm8804_exit);
MODULE_DESCRIPTION("ASoC WM8804 driver");
MODULE_AUTHOR("Dimitris Papastamos <dp@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");
