linux/sound/soc/codecs/twl4030.c

/*
 * ALSA SoC TWL4030 codec driver
 *
 * Author:      Steve Sakoman, <steve@sakoman.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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#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/platform_device.h>
#include <linux/i2c/twl4030.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "twl4030.h"

/*
 * twl4030 register cache & default register settings
 */
static const u8 twl4030_reg[TWL4030_CACHEREGNUM] = {
	0x00, /* this register not used		*/
	0x93, /* REG_CODEC_MODE		(0x1)	*/
	0xc3, /* REG_OPTION		(0x2)	*/
	0x00, /* REG_UNKNOWN		(0x3)	*/
	0x00, /* REG_MICBIAS_CTL	(0x4)	*/
	0x24, /* REG_ANAMICL		(0x5)	*/
	0x04, /* REG_ANAMICR		(0x6)	*/
	0x0a, /* REG_AVADC_CTL		(0x7)	*/
	0x00, /* REG_ADCMICSEL		(0x8)	*/
	0x00, /* REG_DIGMIXING		(0x9)	*/
	0x0c, /* REG_ATXL1PGA		(0xA)	*/
	0x0c, /* REG_ATXR1PGA		(0xB)	*/
	0x00, /* REG_AVTXL2PGA		(0xC)	*/
	0x00, /* REG_AVTXR2PGA		(0xD)	*/
	0x01, /* REG_AUDIO_IF		(0xE)	*/
	0x00, /* REG_VOICE_IF		(0xF)	*/
	0x00, /* REG_ARXR1PGA		(0x10)	*/
	0x00, /* REG_ARXL1PGA		(0x11)	*/
	0x6c, /* REG_ARXR2PGA		(0x12)	*/
	0x6c, /* REG_ARXL2PGA		(0x13)	*/
	0x00, /* REG_VRXPGA		(0x14)	*/
	0x00, /* REG_VSTPGA		(0x15)	*/
	0x00, /* REG_VRX2ARXPGA		(0x16)	*/
	0x0c, /* REG_AVDAC_CTL		(0x17)	*/
	0x00, /* REG_ARX2VTXPGA		(0x18)	*/
	0x00, /* REG_ARXL1_APGA_CTL	(0x19)	*/
	0x00, /* REG_ARXR1_APGA_CTL	(0x1A)	*/
	0x4b, /* REG_ARXL2_APGA_CTL	(0x1B)	*/
	0x4b, /* REG_ARXR2_APGA_CTL	(0x1C)	*/
	0x00, /* REG_ATX2ARXPGA		(0x1D)	*/
	0x00, /* REG_BT_IF		(0x1E)	*/
	0x00, /* REG_BTPGA		(0x1F)	*/
	0x00, /* REG_BTSTPGA		(0x20)	*/
	0x00, /* REG_EAR_CTL		(0x21)	*/
	0x24, /* REG_HS_SEL		(0x22)	*/
	0x0a, /* REG_HS_GAIN_SET	(0x23)	*/
	0x00, /* REG_HS_POPN_SET	(0x24)	*/
	0x00, /* REG_PREDL_CTL		(0x25)	*/
	0x00, /* REG_PREDR_CTL		(0x26)	*/
	0x00, /* REG_PRECKL_CTL		(0x27)	*/
	0x00, /* REG_PRECKR_CTL		(0x28)	*/
	0x00, /* REG_HFL_CTL		(0x29)	*/
	0x00, /* REG_HFR_CTL		(0x2A)	*/
	0x00, /* REG_ALC_CTL		(0x2B)	*/
	0x00, /* REG_ALC_SET1		(0x2C)	*/
	0x00, /* REG_ALC_SET2		(0x2D)	*/
	0x00, /* REG_BOOST_CTL		(0x2E)	*/
	0x00, /* REG_SOFTVOL_CTL	(0x2F)	*/
	0x00, /* REG_DTMF_FREQSEL	(0x30)	*/
	0x00, /* REG_DTMF_TONEXT1H	(0x31)	*/
	0x00, /* REG_DTMF_TONEXT1L	(0x32)	*/
	0x00, /* REG_DTMF_TONEXT2H	(0x33)	*/
	0x00, /* REG_DTMF_TONEXT2L	(0x34)	*/
	0x00, /* REG_DTMF_TONOFF	(0x35)	*/
	0x00, /* REG_DTMF_WANONOFF	(0x36)	*/
	0x00, /* REG_I2S_RX_SCRAMBLE_H	(0x37)	*/
	0x00, /* REG_I2S_RX_SCRAMBLE_M	(0x38)	*/
	0x00, /* REG_I2S_RX_SCRAMBLE_L	(0x39)	*/
	0x16, /* REG_APLL_CTL		(0x3A)	*/
	0x00, /* REG_DTMF_CTL		(0x3B)	*/
	0x00, /* REG_DTMF_PGA_CTL2	(0x3C)	*/
	0x00, /* REG_DTMF_PGA_CTL1	(0x3D)	*/
	0x00, /* REG_MISC_SET_1		(0x3E)	*/
	0x00, /* REG_PCMBTMUX		(0x3F)	*/
	0x00, /* not used		(0x40)	*/
	0x00, /* not used		(0x41)	*/
	0x00, /* not used		(0x42)	*/
	0x00, /* REG_RX_PATH_SEL	(0x43)	*/
	0x00, /* REG_VDL_APGA_CTL	(0x44)	*/
	0x00, /* REG_VIBRA_CTL		(0x45)	*/
	0x00, /* REG_VIBRA_SET		(0x46)	*/
	0x00, /* REG_VIBRA_PWM_SET	(0x47)	*/
	0x00, /* REG_ANAMIC_GAIN	(0x48)	*/
	0x00, /* REG_MISC_SET_2		(0x49)	*/
};

/*
 * read twl4030 register cache
 */
static inline unsigned int twl4030_read_reg_cache(struct snd_soc_codec *codec,
	unsigned int reg)
{
	u8 *cache = codec->reg_cache;

	return cache[reg];
}

/*
 * write twl4030 register cache
 */
static inline void twl4030_write_reg_cache(struct snd_soc_codec *codec,
						u8 reg, u8 value)
{
	u8 *cache = codec->reg_cache;

	if (reg >= TWL4030_CACHEREGNUM)
		return;
	cache[reg] = value;
}

/*
 * write to the twl4030 register space
 */
static int twl4030_write(struct snd_soc_codec *codec,
			unsigned int reg, unsigned int value)
{
	twl4030_write_reg_cache(codec, reg, value);
	return twl4030_i2c_write_u8(TWL4030_MODULE_AUDIO_VOICE, value, reg);
}

static void twl4030_clear_codecpdz(struct snd_soc_codec *codec)
{
	u8 mode;

	mode = twl4030_read_reg_cache(codec, TWL4030_REG_CODEC_MODE);
	twl4030_write(codec, TWL4030_REG_CODEC_MODE,
		mode & ~TWL4030_CODECPDZ);

	/* REVISIT: this delay is present in TI sample drivers */
	/* but there seems to be no TRM requirement for it     */
	udelay(10);
}

static void twl4030_set_codecpdz(struct snd_soc_codec *codec)
{
	u8 mode;

	mode = twl4030_read_reg_cache(codec, TWL4030_REG_CODEC_MODE);
	twl4030_write(codec, TWL4030_REG_CODEC_MODE,
		mode | TWL4030_CODECPDZ);

	/* REVISIT: this delay is present in TI sample drivers */
	/* but there seems to be no TRM requirement for it     */
	udelay(10);
}

static void twl4030_init_chip(struct snd_soc_codec *codec)
{
	int i;

	/* clear CODECPDZ prior to setting register defaults */
	twl4030_clear_codecpdz(codec);

	/* set all audio section registers to reasonable defaults */
	for (i = TWL4030_REG_OPTION; i <= TWL4030_REG_MISC_SET_2; i++)
		twl4030_write(codec, i,	twl4030_reg[i]);

}

/*
 * Some of the gain controls in TWL (mostly those which are associated with
 * the outputs) are implemented in an interesting way:
 * 0x0 : Power down (mute)
 * 0x1 : 6dB
 * 0x2 : 0 dB
 * 0x3 : -6 dB
 * Inverting not going to help with these.
 * Custom volsw and volsw_2r get/put functions to handle these gain bits.
 */
#define SOC_DOUBLE_TLV_TWL4030(xname, xreg, shift_left, shift_right, xmax,\
			       xinvert, tlv_array) \
{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = (xname),\
	.access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |\
		 SNDRV_CTL_ELEM_ACCESS_READWRITE,\
	.tlv.p = (tlv_array), \
	.info = snd_soc_info_volsw, \
	.get = snd_soc_get_volsw_twl4030, \
	.put = snd_soc_put_volsw_twl4030, \
	.private_value = (unsigned long)&(struct soc_mixer_control) \
		{.reg = xreg, .shift = shift_left, .rshift = shift_right,\
		 .max = xmax, .invert = xinvert} }
#define SOC_DOUBLE_R_TLV_TWL4030(xname, reg_left, reg_right, xshift, xmax,\
				 xinvert, tlv_array) \
{	.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = (xname),\
	.access = SNDRV_CTL_ELEM_ACCESS_TLV_READ |\
		 SNDRV_CTL_ELEM_ACCESS_READWRITE,\
	.tlv.p = (tlv_array), \
	.info = snd_soc_info_volsw_2r, \
	.get = snd_soc_get_volsw_r2_twl4030,\
	.put = snd_soc_put_volsw_r2_twl4030, \
	.private_value = (unsigned long)&(struct soc_mixer_control) \
		{.reg = reg_left, .rreg = reg_right, .shift = xshift, \
		.max = xmax, .invert = xinvert} }
#define SOC_SINGLE_TLV_TWL4030(xname, xreg, xshift, xmax, xinvert, tlv_array) \
	SOC_DOUBLE_TLV_TWL4030(xname, xreg, xshift, xshift, xmax, \
			       xinvert, tlv_array)

static int snd_soc_get_volsw_twl4030(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct soc_mixer_control *mc =
		(struct soc_mixer_control *)kcontrol->private_value;
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	unsigned int reg = mc->reg;
	unsigned int shift = mc->shift;
	unsigned int rshift = mc->rshift;
	int max = mc->max;
	int mask = (1 << fls(max)) - 1;

	ucontrol->value.integer.value[0] =
		(snd_soc_read(codec, reg) >> shift) & mask;
	if (ucontrol->value.integer.value[0])
		ucontrol->value.integer.value[0] =
			max + 1 - ucontrol->value.integer.value[0];

	if (shift != rshift) {
		ucontrol->value.integer.value[1] =
			(snd_soc_read(codec, reg) >> rshift) & mask;
		if (ucontrol->value.integer.value[1])
			ucontrol->value.integer.value[1] =
				max + 1 - ucontrol->value.integer.value[1];
	}

	return 0;
}

static int snd_soc_put_volsw_twl4030(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct soc_mixer_control *mc =
		(struct soc_mixer_control *)kcontrol->private_value;
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	unsigned int reg = mc->reg;
	unsigned int shift = mc->shift;
	unsigned int rshift = mc->rshift;
	int max = mc->max;
	int mask = (1 << fls(max)) - 1;
	unsigned short val, val2, val_mask;

	val = (ucontrol->value.integer.value[0] & mask);

	val_mask = mask << shift;
	if (val)
		val = max + 1 - val;
	val = val << shift;
	if (shift != rshift) {
		val2 = (ucontrol->value.integer.value[1] & mask);
		val_mask |= mask << rshift;
		if (val2)
			val2 = max + 1 - val2;
		val |= val2 << rshift;
	}
	return snd_soc_update_bits(codec, reg, val_mask, val);
}

static int snd_soc_get_volsw_r2_twl4030(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct soc_mixer_control *mc =
		(struct soc_mixer_control *)kcontrol->private_value;
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	unsigned int reg = mc->reg;
	unsigned int reg2 = mc->rreg;
	unsigned int shift = mc->shift;
	int max = mc->max;
	int mask = (1<<fls(max))-1;

	ucontrol->value.integer.value[0] =
		(snd_soc_read(codec, reg) >> shift) & mask;
	ucontrol->value.integer.value[1] =
		(snd_soc_read(codec, reg2) >> shift) & mask;

	if (ucontrol->value.integer.value[0])
		ucontrol->value.integer.value[0] =
			max + 1 - ucontrol->value.integer.value[0];
	if (ucontrol->value.integer.value[1])
		ucontrol->value.integer.value[1] =
			max + 1 - ucontrol->value.integer.value[1];

	return 0;
}

static int snd_soc_put_volsw_r2_twl4030(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct soc_mixer_control *mc =
		(struct soc_mixer_control *)kcontrol->private_value;
	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
	unsigned int reg = mc->reg;
	unsigned int reg2 = mc->rreg;
	unsigned int shift = mc->shift;
	int max = mc->max;
	int mask = (1 << fls(max)) - 1;
	int err;
	unsigned short val, val2, val_mask;

	val_mask = mask << shift;
	val = (ucontrol->value.integer.value[0] & mask);
	val2 = (ucontrol->value.integer.value[1] & mask);

	if (val)
		val = max + 1 - val;
	if (val2)
		val2 = max + 1 - val2;

	val = val << shift;
	val2 = val2 << shift;

	err = snd_soc_update_bits(codec, reg, val_mask, val);
	if (err < 0)
		return err;

	err = snd_soc_update_bits(codec, reg2, val_mask, val2);
	return err;
}

/*
 * FGAIN volume control:
 * from -62 to 0 dB in 1 dB steps (mute instead of -63 dB)
 */
static DECLARE_TLV_DB_SCALE(master_tlv, -6300, 100, 1);

/*
 * CGAIN volume control:
 * 0 dB to 12 dB in 6 dB steps
 * value 2 and 3 means 12 dB
 */
static DECLARE_TLV_DB_SCALE(master_coarse_tlv, 0, 600, 0);

static const struct snd_kcontrol_new twl4030_snd_controls[] = {
	SOC_DOUBLE_R_TLV("Master Playback Volume",
		 TWL4030_REG_ARXL2PGA, TWL4030_REG_ARXR2PGA,
		0, 0x3f, 0, master_tlv),
	SOC_DOUBLE_R_TLV("Master PCM Playback Volume",
		 TWL4030_REG_ARXL2PGA, TWL4030_REG_ARXR2PGA,
		6, 0x2, 0, master_coarse_tlv),
	SOC_DOUBLE_R("Capture Volume",
		 TWL4030_REG_ATXL1PGA, TWL4030_REG_ATXR1PGA,
		0, 0x1f, 0),
};

/* add non dapm controls */
static int twl4030_add_controls(struct snd_soc_codec *codec)
{
	int err, i;

	for (i = 0; i < ARRAY_SIZE(twl4030_snd_controls); i++) {
		err = snd_ctl_add(codec->card,
				  snd_soc_cnew(&twl4030_snd_controls[i],
						codec, NULL));
		if (err < 0)
			return err;
	}

	return 0;
}

static const struct snd_soc_dapm_widget twl4030_dapm_widgets[] = {
	SND_SOC_DAPM_INPUT("INL"),
	SND_SOC_DAPM_INPUT("INR"),

	SND_SOC_DAPM_OUTPUT("OUTL"),
	SND_SOC_DAPM_OUTPUT("OUTR"),

	SND_SOC_DAPM_DAC("DACL", "Left Playback", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_DAC("DACR", "Right Playback", SND_SOC_NOPM, 0, 0),

	SND_SOC_DAPM_ADC("ADCL", "Left Capture", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_ADC("ADCR", "Right Capture", SND_SOC_NOPM, 0, 0),
};

static const struct snd_soc_dapm_route intercon[] = {
	/* outputs */
	{"OUTL", NULL, "DACL"},
	{"OUTR", NULL, "DACR"},

	/* inputs */
	{"ADCL", NULL, "INL"},
	{"ADCR", NULL, "INR"},
};

static int twl4030_add_widgets(struct snd_soc_codec *codec)
{
	snd_soc_dapm_new_controls(codec, twl4030_dapm_widgets,
				 ARRAY_SIZE(twl4030_dapm_widgets));

	snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));

	snd_soc_dapm_new_widgets(codec);
	return 0;
}

static void twl4030_power_up(struct snd_soc_codec *codec)
{
	u8 anamicl, regmisc1, byte, popn, hsgain;
	int i = 0;

	/* set CODECPDZ to turn on codec */
	twl4030_set_codecpdz(codec);

	/* initiate offset cancellation */
	anamicl = twl4030_read_reg_cache(codec, TWL4030_REG_ANAMICL);
	twl4030_write(codec, TWL4030_REG_ANAMICL,
		anamicl | TWL4030_CNCL_OFFSET_START);

	/* wait for offset cancellation to complete */
	do {
		/* this takes a little while, so don't slam i2c */
		udelay(2000);
		twl4030_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &byte,
				    TWL4030_REG_ANAMICL);
	} while ((i++ < 100) &&
		 ((byte & TWL4030_CNCL_OFFSET_START) ==
		  TWL4030_CNCL_OFFSET_START));

	/* anti-pop when changing analog gain */
	regmisc1 = twl4030_read_reg_cache(codec, TWL4030_REG_MISC_SET_1);
	twl4030_write(codec, TWL4030_REG_MISC_SET_1,
		regmisc1 | TWL4030_SMOOTH_ANAVOL_EN);

	/* toggle CODECPDZ as per TRM */
	twl4030_clear_codecpdz(codec);
	twl4030_set_codecpdz(codec);

	/* program anti-pop with bias ramp delay */
	popn = twl4030_read_reg_cache(codec, TWL4030_REG_HS_POPN_SET);
	popn &= TWL4030_RAMP_DELAY;
	popn |=	TWL4030_RAMP_DELAY_645MS;
	twl4030_write(codec, TWL4030_REG_HS_POPN_SET, popn);
	popn |=	TWL4030_VMID_EN;
	twl4030_write(codec, TWL4030_REG_HS_POPN_SET, popn);

	/* enable output stage and gain setting */
	hsgain = TWL4030_HSR_GAIN_0DB | TWL4030_HSL_GAIN_0DB;
	twl4030_write(codec, TWL4030_REG_HS_GAIN_SET, hsgain);

	/* enable anti-pop ramp */
	popn |= TWL4030_RAMP_EN;
	twl4030_write(codec, TWL4030_REG_HS_POPN_SET, popn);
}

static void twl4030_power_down(struct snd_soc_codec *codec)
{
	u8 popn, hsgain;

	/* disable anti-pop ramp */
	popn = twl4030_read_reg_cache(codec, TWL4030_REG_HS_POPN_SET);
	popn &= ~TWL4030_RAMP_EN;
	twl4030_write(codec, TWL4030_REG_HS_POPN_SET, popn);

	/* disable output stage and gain setting */
	hsgain = TWL4030_HSR_GAIN_PWR_DOWN | TWL4030_HSL_GAIN_PWR_DOWN;
	twl4030_write(codec, TWL4030_REG_HS_GAIN_SET, hsgain);

	/* disable bias out */
	popn &= ~TWL4030_VMID_EN;
	twl4030_write(codec, TWL4030_REG_HS_POPN_SET, popn);

	/* power down */
	twl4030_clear_codecpdz(codec);
}

static int twl4030_set_bias_level(struct snd_soc_codec *codec,
				  enum snd_soc_bias_level level)
{
	switch (level) {
	case SND_SOC_BIAS_ON:
		twl4030_power_up(codec);
		break;
	case SND_SOC_BIAS_PREPARE:
		/* TODO: develop a twl4030_prepare function */
		break;
	case SND_SOC_BIAS_STANDBY:
		/* TODO: develop a twl4030_standby function */
		twl4030_power_down(codec);
		break;
	case SND_SOC_BIAS_OFF:
		twl4030_power_down(codec);
		break;
	}
	codec->bias_level = level;

	return 0;
}

static int twl4030_hw_params(struct snd_pcm_substream *substream,
			   struct snd_pcm_hw_params *params,
			   struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->codec;
	u8 mode, old_mode, format, old_format;


	/* bit rate */
	old_mode = twl4030_read_reg_cache(codec,
			TWL4030_REG_CODEC_MODE) & ~TWL4030_CODECPDZ;
	mode = old_mode & ~TWL4030_APLL_RATE;

	switch (params_rate(params)) {
	case 8000:
		mode |= TWL4030_APLL_RATE_8000;
		break;
	case 11025:
		mode |= TWL4030_APLL_RATE_11025;
		break;
	case 12000:
		mode |= TWL4030_APLL_RATE_12000;
		break;
	case 16000:
		mode |= TWL4030_APLL_RATE_16000;
		break;
	case 22050:
		mode |= TWL4030_APLL_RATE_22050;
		break;
	case 24000:
		mode |= TWL4030_APLL_RATE_24000;
		break;
	case 32000:
		mode |= TWL4030_APLL_RATE_32000;
		break;
	case 44100:
		mode |= TWL4030_APLL_RATE_44100;
		break;
	case 48000:
		mode |= TWL4030_APLL_RATE_48000;
		break;
	default:
		printk(KERN_ERR "TWL4030 hw params: unknown rate %d\n",
			params_rate(params));
		return -EINVAL;
	}

	if (mode != old_mode) {
		/* change rate and set CODECPDZ */
		twl4030_write(codec, TWL4030_REG_CODEC_MODE, mode);
		twl4030_set_codecpdz(codec);
	}

	/* sample size */
	old_format = twl4030_read_reg_cache(codec, TWL4030_REG_AUDIO_IF);
	format = old_format;
	format &= ~TWL4030_DATA_WIDTH;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		format |= TWL4030_DATA_WIDTH_16S_16W;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		format |= TWL4030_DATA_WIDTH_32S_24W;
		break;
	default:
		printk(KERN_ERR "TWL4030 hw params: unknown format %d\n",
			params_format(params));
		return -EINVAL;
	}

	if (format != old_format) {

		/* clear CODECPDZ before changing format (codec requirement) */
		twl4030_clear_codecpdz(codec);

		/* change format */
		twl4030_write(codec, TWL4030_REG_AUDIO_IF, format);

		/* set CODECPDZ afterwards */
		twl4030_set_codecpdz(codec);
	}
	return 0;
}

static int twl4030_set_dai_sysclk(struct snd_soc_dai *codec_dai,
		int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u8 infreq;

	switch (freq) {
	case 19200000:
		infreq = TWL4030_APLL_INFREQ_19200KHZ;
		break;
	case 26000000:
		infreq = TWL4030_APLL_INFREQ_26000KHZ;
		break;
	case 38400000:
		infreq = TWL4030_APLL_INFREQ_38400KHZ;
		break;
	default:
		printk(KERN_ERR "TWL4030 set sysclk: unknown rate %d\n",
			freq);
		return -EINVAL;
	}

	infreq |= TWL4030_APLL_EN;
	twl4030_write(codec, TWL4030_REG_APLL_CTL, infreq);

	return 0;
}

static int twl4030_set_dai_fmt(struct snd_soc_dai *codec_dai,
			     unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u8 old_format, format;

	/* get format */
	old_format = twl4030_read_reg_cache(codec, TWL4030_REG_AUDIO_IF);
	format = old_format;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		format &= ~(TWL4030_AIF_SLAVE_EN);
		format &= ~(TWL4030_CLK256FS_EN);
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		format |= TWL4030_AIF_SLAVE_EN;
		format |= TWL4030_CLK256FS_EN;
		break;
	default:
		return -EINVAL;
	}

	/* interface format */
	format &= ~TWL4030_AIF_FORMAT;
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		format |= TWL4030_AIF_FORMAT_CODEC;
		break;
	default:
		return -EINVAL;
	}

	if (format != old_format) {

		/* clear CODECPDZ before changing format (codec requirement) */
		twl4030_clear_codecpdz(codec);

		/* change format */
		twl4030_write(codec, TWL4030_REG_AUDIO_IF, format);

		/* set CODECPDZ afterwards */
		twl4030_set_codecpdz(codec);
	}

	return 0;
}

#define TWL4030_RATES	 (SNDRV_PCM_RATE_8000_48000)
#define TWL4030_FORMATS	 (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FORMAT_S24_LE)

struct snd_soc_dai twl4030_dai = {
	.name = "twl4030",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = TWL4030_RATES,
		.formats = TWL4030_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 2,
		.channels_max = 2,
		.rates = TWL4030_RATES,
		.formats = TWL4030_FORMATS,},
	.ops = {
		.hw_params = twl4030_hw_params,
		.set_sysclk = twl4030_set_dai_sysclk,
		.set_fmt = twl4030_set_dai_fmt,
	}
};
EXPORT_SYMBOL_GPL(twl4030_dai);

static int twl4030_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->codec;

	twl4030_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;
}

static int twl4030_resume(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->codec;

	twl4030_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	twl4030_set_bias_level(codec, codec->suspend_bias_level);
	return 0;
}

/*
 * initialize the driver
 * register the mixer and dsp interfaces with the kernel
 */

static int twl4030_init(struct snd_soc_device *socdev)
{
	struct snd_soc_codec *codec = socdev->codec;
	int ret = 0;

	printk(KERN_INFO "TWL4030 Audio Codec init \n");

	codec->name = "twl4030";
	codec->owner = THIS_MODULE;
	codec->read = twl4030_read_reg_cache;
	codec->write = twl4030_write;
	codec->set_bias_level = twl4030_set_bias_level;
	codec->dai = &twl4030_dai;
	codec->num_dai = 1;
	codec->reg_cache_size = sizeof(twl4030_reg);
	codec->reg_cache = kmemdup(twl4030_reg, sizeof(twl4030_reg),
					GFP_KERNEL);
	if (codec->reg_cache == NULL)
		return -ENOMEM;

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		printk(KERN_ERR "twl4030: failed to create pcms\n");
		goto pcm_err;
	}

	twl4030_init_chip(codec);

	/* power on device */
	twl4030_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	twl4030_add_controls(codec);
	twl4030_add_widgets(codec);

	ret = snd_soc_register_card(socdev);
	if (ret < 0) {
		printk(KERN_ERR "twl4030: failed to register card\n");
		goto card_err;
	}

	return ret;

card_err:
	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);
pcm_err:
	kfree(codec->reg_cache);
	return ret;
}

static struct snd_soc_device *twl4030_socdev;

static int twl4030_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;

	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
	if (codec == NULL)
		return -ENOMEM;

	socdev->codec = codec;
	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	twl4030_socdev = socdev;
	twl4030_init(socdev);

	return 0;
}

static int twl4030_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->codec;

	printk(KERN_INFO "TWL4030 Audio Codec remove\n");
	kfree(codec);

	return 0;
}

struct snd_soc_codec_device soc_codec_dev_twl4030 = {
	.probe = twl4030_probe,
	.remove = twl4030_remove,
	.suspend = twl4030_suspend,
	.resume = twl4030_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_twl4030);

MODULE_DESCRIPTION("ASoC TWL4030 codec driver");
MODULE_AUTHOR("Steve Sakoman");
MODULE_LICENSE("GPL");