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linux/sound/soc/codecs/wm2000.c
Jesper Juhl c83f1d7e71 ASoC: wm2000: Fix use-after-free - don't release_firmware() twice on error 
In wm2000_i2c_probe(), if we take the true branch in

"
  ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm2000,
                               NULL, 0);
  if (ret != 0)
          goto err_fw;
"

then we'll release_firmware(fw) at the 'err_fw' label. But we've already
done that just a few lines above. That's a use-after-free bug.

This patch restructures the code so that we always call
release_firmware(fw) before leaving the function, but only ever call
it once.
This means that we have to initialize 'fw' to NULL since some paths
may now end up calling it without having called request_firmware(),
but since request_firmware() deals gracefully with NULL pointers, we
are fine if we just NULL initialize it.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-01-24 11:34:19 +00:00

863 lines
20 KiB
C
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/*
* wm2000.c -- WM2000 ALSA Soc Audio driver
*
* Copyright 2008-2010 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@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.
*
* The download image for the WM2000 will be requested as
* 'wm2000_anc.bin' by default (overridable via platform data) at
* runtime and is expected to be in flat binary format. This is
* generated by Wolfson configuration tools and includes
* system-specific callibration information. If supplied as a
* sequence of ASCII-encoded hexidecimal bytes this can be converted
* into a flat binary with a command such as this on the command line:
*
* perl -e 'while (<>) { s/[\r\n]+// ; printf("%c", hex($_)); }'
* < file > wm2000_anc.bin
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/firmware.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/debugfs.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/wm2000.h>
#include "wm2000.h"
enum wm2000_anc_mode {
ANC_ACTIVE = 0,
ANC_BYPASS = 1,
ANC_STANDBY = 2,
ANC_OFF = 3,
};
struct wm2000_priv {
struct i2c_client *i2c;
struct regmap *regmap;
enum wm2000_anc_mode anc_mode;
unsigned int anc_active:1;
unsigned int anc_eng_ena:1;
unsigned int spk_ena:1;
unsigned int mclk_div:1;
unsigned int speech_clarity:1;
int anc_download_size;
char *anc_download;
};
static int wm2000_write(struct i2c_client *i2c, unsigned int reg,
unsigned int value)
{
struct wm2000_priv *wm2000 = i2c_get_clientdata(i2c);
return regmap_write(wm2000->regmap, reg, value);
}
static unsigned int wm2000_read(struct i2c_client *i2c, unsigned int r)
{
struct wm2000_priv *wm2000 = i2c_get_clientdata(i2c);
unsigned int val;
int ret;
ret = regmap_read(wm2000->regmap, r, &val);
if (ret < 0)
return -1;
return val;
}
static void wm2000_reset(struct wm2000_priv *wm2000)
{
struct i2c_client *i2c = wm2000->i2c;
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
wm2000_write(i2c, WM2000_REG_ID1, 0);
wm2000->anc_mode = ANC_OFF;
}
static int wm2000_poll_bit(struct i2c_client *i2c,
unsigned int reg, u8 mask, int timeout)
{
int val;
val = wm2000_read(i2c, reg);
while (!(val & mask) && --timeout) {
msleep(1);
val = wm2000_read(i2c, reg);
}
if (timeout == 0)
return 0;
else
return 1;
}
static int wm2000_power_up(struct i2c_client *i2c, int analogue)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
int ret, timeout;
BUG_ON(wm2000->anc_mode != ANC_OFF);
dev_dbg(&i2c->dev, "Beginning power up\n");
if (!wm2000->mclk_div) {
dev_dbg(&i2c->dev, "Disabling MCLK divider\n");
wm2000_write(i2c, WM2000_REG_SYS_CTL2,
WM2000_MCLK_DIV2_ENA_CLR);
} else {
dev_dbg(&i2c->dev, "Enabling MCLK divider\n");
wm2000_write(i2c, WM2000_REG_SYS_CTL2,
WM2000_MCLK_DIV2_ENA_SET);
}
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_CLR);
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_ENG_SET);
/* Wait for ANC engine to become ready */
if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
WM2000_ANC_ENG_IDLE, 1)) {
dev_err(&i2c->dev, "ANC engine failed to reset\n");
return -ETIMEDOUT;
}
if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
WM2000_STATUS_BOOT_COMPLETE, 1)) {
dev_err(&i2c->dev, "ANC engine failed to initialise\n");
return -ETIMEDOUT;
}
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
/* Open code download of the data since it is the only bulk
* write we do. */
dev_dbg(&i2c->dev, "Downloading %d bytes\n",
wm2000->anc_download_size - 2);
ret = i2c_master_send(i2c, wm2000->anc_download,
wm2000->anc_download_size);
if (ret < 0) {
dev_err(&i2c->dev, "i2c_transfer() failed: %d\n", ret);
return ret;
}
if (ret != wm2000->anc_download_size) {
dev_err(&i2c->dev, "i2c_transfer() failed, %d != %d\n",
ret, wm2000->anc_download_size);
return -EIO;
}
dev_dbg(&i2c->dev, "Download complete\n");
if (analogue) {
timeout = 248;
wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_ANA_SEQ_INCLUDE |
WM2000_MODE_MOUSE_ENABLE |
WM2000_MODE_THERMAL_ENABLE);
} else {
timeout = 10;
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_MOUSE_ENABLE |
WM2000_MODE_THERMAL_ENABLE);
}
ret = wm2000_read(i2c, WM2000_REG_SPEECH_CLARITY);
if (wm2000->speech_clarity)
ret &= ~WM2000_SPEECH_CLARITY;
else
ret |= WM2000_SPEECH_CLARITY;
wm2000_write(i2c, WM2000_REG_SPEECH_CLARITY, ret);
wm2000_write(i2c, WM2000_REG_SYS_START0, 0x33);
wm2000_write(i2c, WM2000_REG_SYS_START1, 0x02);
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
dev_err(&i2c->dev, "Timed out waiting for device after %dms\n",
timeout * 10);
return -ETIMEDOUT;
}
dev_dbg(&i2c->dev, "ANC active\n");
if (analogue)
dev_dbg(&i2c->dev, "Analogue active\n");
wm2000->anc_mode = ANC_ACTIVE;
return 0;
}
static int wm2000_power_down(struct i2c_client *i2c, int analogue)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
int timeout;
if (analogue) {
timeout = 248;
wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_ANA_SEQ_INCLUDE |
WM2000_MODE_POWER_DOWN);
} else {
timeout = 10;
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_POWER_DOWN);
}
if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
WM2000_STATUS_POWER_DOWN_COMPLETE, timeout)) {
dev_err(&i2c->dev, "Timeout waiting for ANC power down\n");
return -ETIMEDOUT;
}
if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
WM2000_ANC_ENG_IDLE, 1)) {
dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
return -ETIMEDOUT;
}
dev_dbg(&i2c->dev, "powered off\n");
wm2000->anc_mode = ANC_OFF;
return 0;
}
static int wm2000_enter_bypass(struct i2c_client *i2c, int analogue)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
BUG_ON(wm2000->anc_mode != ANC_ACTIVE);
if (analogue) {
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_ANA_SEQ_INCLUDE |
WM2000_MODE_THERMAL_ENABLE |
WM2000_MODE_BYPASS_ENTRY);
} else {
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_THERMAL_ENABLE |
WM2000_MODE_BYPASS_ENTRY);
}
if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
WM2000_STATUS_ANC_DISABLED, 10)) {
dev_err(&i2c->dev, "Timeout waiting for ANC disable\n");
return -ETIMEDOUT;
}
if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT,
WM2000_ANC_ENG_IDLE, 1)) {
dev_err(&i2c->dev, "Timeout waiting for ANC engine idle\n");
return -ETIMEDOUT;
}
wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
wm2000->anc_mode = ANC_BYPASS;
dev_dbg(&i2c->dev, "bypass enabled\n");
return 0;
}
static int wm2000_exit_bypass(struct i2c_client *i2c, int analogue)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
BUG_ON(wm2000->anc_mode != ANC_BYPASS);
wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);
if (analogue) {
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_ANA_SEQ_INCLUDE |
WM2000_MODE_MOUSE_ENABLE |
WM2000_MODE_THERMAL_ENABLE);
} else {
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_MOUSE_ENABLE |
WM2000_MODE_THERMAL_ENABLE);
}
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
WM2000_STATUS_MOUSE_ACTIVE, 10)) {
dev_err(&i2c->dev, "Timed out waiting for MOUSE\n");
return -ETIMEDOUT;
}
wm2000->anc_mode = ANC_ACTIVE;
dev_dbg(&i2c->dev, "MOUSE active\n");
return 0;
}
static int wm2000_enter_standby(struct i2c_client *i2c, int analogue)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
int timeout;
BUG_ON(wm2000->anc_mode != ANC_ACTIVE);
if (analogue) {
timeout = 248;
wm2000_write(i2c, WM2000_REG_ANA_VMID_PD_TIME, timeout / 4);
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_ANA_SEQ_INCLUDE |
WM2000_MODE_THERMAL_ENABLE |
WM2000_MODE_STANDBY_ENTRY);
} else {
timeout = 10;
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_THERMAL_ENABLE |
WM2000_MODE_STANDBY_ENTRY);
}
if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
WM2000_STATUS_ANC_DISABLED, timeout)) {
dev_err(&i2c->dev,
"Timed out waiting for ANC disable after 1ms\n");
return -ETIMEDOUT;
}
if (!wm2000_poll_bit(i2c, WM2000_REG_ANC_STAT, WM2000_ANC_ENG_IDLE,
1)) {
dev_err(&i2c->dev,
"Timed out waiting for standby after %dms\n",
timeout * 10);
return -ETIMEDOUT;
}
wm2000_write(i2c, WM2000_REG_SYS_CTL1, WM2000_SYS_STBY);
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_CLR);
wm2000->anc_mode = ANC_STANDBY;
dev_dbg(&i2c->dev, "standby\n");
if (analogue)
dev_dbg(&i2c->dev, "Analogue disabled\n");
return 0;
}
static int wm2000_exit_standby(struct i2c_client *i2c, int analogue)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
int timeout;
BUG_ON(wm2000->anc_mode != ANC_STANDBY);
wm2000_write(i2c, WM2000_REG_SYS_CTL1, 0);
if (analogue) {
timeout = 248;
wm2000_write(i2c, WM2000_REG_ANA_VMID_PU_TIME, timeout / 4);
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_ANA_SEQ_INCLUDE |
WM2000_MODE_THERMAL_ENABLE |
WM2000_MODE_MOUSE_ENABLE);
} else {
timeout = 10;
wm2000_write(i2c, WM2000_REG_SYS_MODE_CNTRL,
WM2000_MODE_THERMAL_ENABLE |
WM2000_MODE_MOUSE_ENABLE);
}
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_RAM_SET);
wm2000_write(i2c, WM2000_REG_SYS_CTL2, WM2000_ANC_INT_N_CLR);
if (!wm2000_poll_bit(i2c, WM2000_REG_SYS_STATUS,
WM2000_STATUS_MOUSE_ACTIVE, timeout)) {
dev_err(&i2c->dev, "Timed out waiting for MOUSE after %dms\n",
timeout * 10);
return -ETIMEDOUT;
}
wm2000->anc_mode = ANC_ACTIVE;
dev_dbg(&i2c->dev, "MOUSE active\n");
if (analogue)
dev_dbg(&i2c->dev, "Analogue enabled\n");
return 0;
}
typedef int (*wm2000_mode_fn)(struct i2c_client *i2c, int analogue);
static struct {
enum wm2000_anc_mode source;
enum wm2000_anc_mode dest;
int analogue;
wm2000_mode_fn step[2];
} anc_transitions[] = {
{
.source = ANC_OFF,
.dest = ANC_ACTIVE,
.analogue = 1,
.step = {
wm2000_power_up,
},
},
{
.source = ANC_OFF,
.dest = ANC_STANDBY,
.step = {
wm2000_power_up,
wm2000_enter_standby,
},
},
{
.source = ANC_OFF,
.dest = ANC_BYPASS,
.analogue = 1,
.step = {
wm2000_power_up,
wm2000_enter_bypass,
},
},
{
.source = ANC_ACTIVE,
.dest = ANC_BYPASS,
.analogue = 1,
.step = {
wm2000_enter_bypass,
},
},
{
.source = ANC_ACTIVE,
.dest = ANC_STANDBY,
.analogue = 1,
.step = {
wm2000_enter_standby,
},
},
{
.source = ANC_ACTIVE,
.dest = ANC_OFF,
.analogue = 1,
.step = {
wm2000_power_down,
},
},
{
.source = ANC_BYPASS,
.dest = ANC_ACTIVE,
.analogue = 1,
.step = {
wm2000_exit_bypass,
},
},
{
.source = ANC_BYPASS,
.dest = ANC_STANDBY,
.analogue = 1,
.step = {
wm2000_exit_bypass,
wm2000_enter_standby,
},
},
{
.source = ANC_BYPASS,
.dest = ANC_OFF,
.step = {
wm2000_exit_bypass,
wm2000_power_down,
},
},
{
.source = ANC_STANDBY,
.dest = ANC_ACTIVE,
.analogue = 1,
.step = {
wm2000_exit_standby,
},
},
{
.source = ANC_STANDBY,
.dest = ANC_BYPASS,
.analogue = 1,
.step = {
wm2000_exit_standby,
wm2000_enter_bypass,
},
},
{
.source = ANC_STANDBY,
.dest = ANC_OFF,
.step = {
wm2000_exit_standby,
wm2000_power_down,
},
},
};
static int wm2000_anc_transition(struct wm2000_priv *wm2000,
enum wm2000_anc_mode mode)
{
struct i2c_client *i2c = wm2000->i2c;
int i, j;
int ret;
if (wm2000->anc_mode == mode)
return 0;
for (i = 0; i < ARRAY_SIZE(anc_transitions); i++)
if (anc_transitions[i].source == wm2000->anc_mode &&
anc_transitions[i].dest == mode)
break;
if (i == ARRAY_SIZE(anc_transitions)) {
dev_err(&i2c->dev, "No transition for %d->%d\n",
wm2000->anc_mode, mode);
return -EINVAL;
}
for (j = 0; j < ARRAY_SIZE(anc_transitions[j].step); j++) {
if (!anc_transitions[i].step[j])
break;
ret = anc_transitions[i].step[j](i2c,
anc_transitions[i].analogue);
if (ret != 0)
return ret;
}
return 0;
}
static int wm2000_anc_set_mode(struct wm2000_priv *wm2000)
{
struct i2c_client *i2c = wm2000->i2c;
enum wm2000_anc_mode mode;
if (wm2000->anc_eng_ena && wm2000->spk_ena)
if (wm2000->anc_active)
mode = ANC_ACTIVE;
else
mode = ANC_BYPASS;
else
mode = ANC_STANDBY;
dev_dbg(&i2c->dev, "Set mode %d (enabled %d, mute %d, active %d)\n",
mode, wm2000->anc_eng_ena, !wm2000->spk_ena,
wm2000->anc_active);
return wm2000_anc_transition(wm2000, mode);
}
static int wm2000_anc_mode_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
ucontrol->value.enumerated.item[0] = wm2000->anc_active;
return 0;
}
static int wm2000_anc_mode_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
int anc_active = ucontrol->value.enumerated.item[0];
if (anc_active > 1)
return -EINVAL;
wm2000->anc_active = anc_active;
return wm2000_anc_set_mode(wm2000);
}
static int wm2000_speaker_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
ucontrol->value.enumerated.item[0] = wm2000->spk_ena;
return 0;
}
static int wm2000_speaker_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
int val = ucontrol->value.enumerated.item[0];
if (val > 1)
return -EINVAL;
wm2000->spk_ena = val;
return wm2000_anc_set_mode(wm2000);
}
static const struct snd_kcontrol_new wm2000_controls[] = {
SOC_SINGLE_BOOL_EXT("WM2000 ANC Switch", 0,
wm2000_anc_mode_get,
wm2000_anc_mode_put),
SOC_SINGLE_BOOL_EXT("WM2000 Switch", 0,
wm2000_speaker_get,
wm2000_speaker_put),
};
static int wm2000_anc_power_event(struct snd_soc_dapm_widget *w,
struct snd_kcontrol *kcontrol, int event)
{
struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
if (SND_SOC_DAPM_EVENT_ON(event))
wm2000->anc_eng_ena = 1;
if (SND_SOC_DAPM_EVENT_OFF(event))
wm2000->anc_eng_ena = 0;
return wm2000_anc_set_mode(wm2000);
}
static const struct snd_soc_dapm_widget wm2000_dapm_widgets[] = {
/* Externally visible pins */
SND_SOC_DAPM_OUTPUT("SPKN"),
SND_SOC_DAPM_OUTPUT("SPKP"),
SND_SOC_DAPM_INPUT("LINN"),
SND_SOC_DAPM_INPUT("LINP"),
SND_SOC_DAPM_PGA_E("ANC Engine", SND_SOC_NOPM, 0, 0, NULL, 0,
wm2000_anc_power_event,
SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
};
/* Target, Path, Source */
static const struct snd_soc_dapm_route wm2000_audio_map[] = {
{ "SPKN", NULL, "ANC Engine" },
{ "SPKP", NULL, "ANC Engine" },
{ "ANC Engine", NULL, "LINN" },
{ "ANC Engine", NULL, "LINP" },
};
#ifdef CONFIG_PM
static int wm2000_suspend(struct snd_soc_codec *codec)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
return wm2000_anc_transition(wm2000, ANC_OFF);
}
static int wm2000_resume(struct snd_soc_codec *codec)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
return wm2000_anc_set_mode(wm2000);
}
#else
#define wm2000_suspend NULL
#define wm2000_resume NULL
#endif
static const struct regmap_config wm2000_regmap = {
.reg_bits = 8,
.val_bits = 8,
};
static int wm2000_probe(struct snd_soc_codec *codec)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
/* This will trigger a transition to standby mode by default */
wm2000_anc_set_mode(wm2000);
return 0;
}
static int wm2000_remove(struct snd_soc_codec *codec)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(codec->dev);
return wm2000_anc_transition(wm2000, ANC_OFF);
}
static struct snd_soc_codec_driver soc_codec_dev_wm2000 = {
.probe = wm2000_probe,
.remove = wm2000_remove,
.suspend = wm2000_suspend,
.resume = wm2000_resume,
.dapm_widgets = wm2000_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(wm2000_dapm_widgets),
.dapm_routes = wm2000_audio_map,
.num_dapm_routes = ARRAY_SIZE(wm2000_audio_map),
.controls = wm2000_controls,
.num_controls = ARRAY_SIZE(wm2000_controls),
};
static int __devinit wm2000_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *i2c_id)
{
struct wm2000_priv *wm2000;
struct wm2000_platform_data *pdata;
const char *filename;
const struct firmware *fw = NULL;
int ret;
int reg;
u16 id;
wm2000 = devm_kzalloc(&i2c->dev, sizeof(struct wm2000_priv),
GFP_KERNEL);
if (wm2000 == NULL) {
dev_err(&i2c->dev, "Unable to allocate private data\n");
return -ENOMEM;
}
dev_set_drvdata(&i2c->dev, wm2000);
wm2000->regmap = regmap_init_i2c(i2c, &wm2000_regmap);
if (IS_ERR(wm2000->regmap)) {
ret = PTR_ERR(wm2000->regmap);
dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
ret);
goto out;
}
/* Verify that this is a WM2000 */
reg = wm2000_read(i2c, WM2000_REG_ID1);
id = reg << 8;
reg = wm2000_read(i2c, WM2000_REG_ID2);
id |= reg & 0xff;
if (id != 0x2000) {
dev_err(&i2c->dev, "Device is not a WM2000 - ID %x\n", id);
ret = -ENODEV;
goto out_regmap_exit;
}
reg = wm2000_read(i2c, WM2000_REG_REVISON);
dev_info(&i2c->dev, "revision %c\n", reg + 'A');
filename = "wm2000_anc.bin";
pdata = dev_get_platdata(&i2c->dev);
if (pdata) {
wm2000->mclk_div = pdata->mclkdiv2;
wm2000->speech_clarity = !pdata->speech_enh_disable;
if (pdata->download_file)
filename = pdata->download_file;
}
ret = request_firmware(&fw, filename, &i2c->dev);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to acquire ANC data: %d\n", ret);
goto out_regmap_exit;
}
/* Pre-cook the concatenation of the register address onto the image */
wm2000->anc_download_size = fw->size + 2;
wm2000->anc_download = devm_kzalloc(&i2c->dev,
wm2000->anc_download_size,
GFP_KERNEL);
if (wm2000->anc_download == NULL) {
dev_err(&i2c->dev, "Out of memory\n");
ret = -ENOMEM;
goto out_regmap_exit;
}
wm2000->anc_download[0] = 0x80;
wm2000->anc_download[1] = 0x00;
memcpy(wm2000->anc_download + 2, fw->data, fw->size);
wm2000->anc_eng_ena = 1;
wm2000->anc_active = 1;
wm2000->spk_ena = 1;
wm2000->i2c = i2c;
wm2000_reset(wm2000);
ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm2000, NULL, 0);
if (!ret)
goto out;
out_regmap_exit:
regmap_exit(wm2000->regmap);
out:
release_firmware(fw);
return ret;
}
static __devexit int wm2000_i2c_remove(struct i2c_client *i2c)
{
struct wm2000_priv *wm2000 = dev_get_drvdata(&i2c->dev);
snd_soc_unregister_codec(&i2c->dev);
regmap_exit(wm2000->regmap);
return 0;
}
static const struct i2c_device_id wm2000_i2c_id[] = {
{ "wm2000", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm2000_i2c_id);
static struct i2c_driver wm2000_i2c_driver = {
.driver = {
.name = "wm2000",
.owner = THIS_MODULE,
},
.probe = wm2000_i2c_probe,
.remove = __devexit_p(wm2000_i2c_remove),
.id_table = wm2000_i2c_id,
};
static int __init wm2000_init(void)
{
return i2c_add_driver(&wm2000_i2c_driver);
}
module_init(wm2000_init);
static void __exit wm2000_exit(void)
{
i2c_del_driver(&wm2000_i2c_driver);
}
module_exit(wm2000_exit);
MODULE_DESCRIPTION("ASoC WM2000 driver");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfonmicro.com>");
MODULE_LICENSE("GPL");
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