sound/pci/oxygen/virtuoso.c - kernel/msm-4.9 - Gitiles

 /*
  * C-Media CMI8788 driver for Asus Xonar cards
  *
  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
  *
  *
  *  This driver is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License, version 2.
  *
  *  This driver 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 driver; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */

 /*
  * CMI8788:
  *
  * SPI 0 -> 1st PCM1796 (front)
  * SPI 1 -> 2nd PCM1796 (surround)
  * SPI 2 -> 3rd PCM1796 (center/LFE)
  * SPI 4 -> 4th PCM1796 (back)
  *
  * GPIO 2 -> M0 of CS5381
  * GPIO 3 -> M1 of CS5381
  * GPIO 5 <- external power present (D2X only)
  * GPIO 7 -> ALT
  * GPIO 8 -> enable output to speakers
  *
  * CM9780:
  *
  * GPIO 0 -> enable AC'97 bypass (line in -> ADC)
  */

 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include <sound/ac97_codec.h>
 #include <sound/control.h>
 #include <sound/core.h>
 #include <sound/initval.h>
 #include <sound/pcm.h>
 #include <sound/tlv.h>
 #include "oxygen.h"
 #include "cm9780.h"

 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
 MODULE_DESCRIPTION("Asus AV200 driver");
 MODULE_LICENSE("GPL");
 MODULE_SUPPORTED_DEVICE("{{Asus,AV200}}");

 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "card index");
 module_param_array(id, charp, NULL, 0444);
 MODULE_PARM_DESC(id, "ID string");
 module_param_array(enable, bool, NULL, 0444);
 MODULE_PARM_DESC(enable, "enable card");

 static struct pci_device_id xonar_ids[] __devinitdata = {
 	{ OXYGEN_PCI_SUBID(0x1043, 0x8269) }, /* Asus Xonar D2 */
 	{ OXYGEN_PCI_SUBID(0x1043, 0x82b7) }, /* Asus Xonar D2X */
 	{ }
 };
 MODULE_DEVICE_TABLE(pci, xonar_ids);


 #define GPIO_CS5381_M_MASK	0x000c
 #define GPIO_CS5381_M_SINGLE	0x0000
 #define GPIO_CS5381_M_DOUBLE	0x0004
 #define GPIO_CS5381_M_QUAD	0x0008
 #define GPIO_EXT_POWER		0x0020
 #define GPIO_ALT		0x0080
 #define GPIO_OUTPUT_ENABLE	0x0100

 /* register 16 */
 #define PCM1796_ATL_MASK	0xff
 /* register 17 */
 #define PCM1796_ATR_MASK	0xff
 /* register 18 */
 #define PCM1796_MUTE		0x01
 #define PCM1796_DME		0x02
 #define PCM1796_DMF_MASK	0x0c
 #define PCM1796_DMF_DISABLED	0x00
 #define PCM1796_DMF_48		0x04
 #define PCM1796_DMF_441		0x08
 #define PCM1796_DMF_32		0x0c
 #define PCM1796_FMT_MASK	0x70
 #define PCM1796_FMT_16_RJUST	0x00
 #define PCM1796_FMT_20_RJUST	0x10
 #define PCM1796_FMT_24_RJUST	0x20
 #define PCM1796_FMT_24_LJUST	0x30
 #define PCM1796_FMT_16_I2S	0x40
 #define PCM1796_FMT_24_I2S	0x50
 #define PCM1796_ATLD		0x80
 /* register 19 */
 #define PCM1796_INZD		0x01
 #define PCM1796_FLT_MASK	0x02
 #define PCM1796_FLT_SHARP	0x00
 #define PCM1796_FLT_SLOW	0x02
 #define PCM1796_DFMS		0x04
 #define PCM1796_OPE		0x10
 #define PCM1796_ATS_MASK	0x60
 #define PCM1796_ATS_1		0x00
 #define PCM1796_ATS_2		0x20
 #define PCM1796_ATS_4		0x40
 #define PCM1796_ATS_8		0x60
 #define PCM1796_REV		0x80
 /* register 20 */
 #define PCM1796_OS_MASK		0x03
 #define PCM1796_OS_64		0x00
 #define PCM1796_OS_32		0x01
 #define PCM1796_OS_128		0x02
 #define PCM1796_CHSL_MASK	0x04
 #define PCM1796_CHSL_LEFT	0x00
 #define PCM1796_CHSL_RIGHT	0x04
 #define PCM1796_MONO		0x08
 #define PCM1796_DFTH		0x10
 #define PCM1796_DSD		0x20
 #define PCM1796_SRST		0x40
 /* register 21 */
 #define PCM1796_PCMZ		0x01
 #define PCM1796_DZ_MASK		0x06
 /* register 22 */
 #define PCM1796_ZFGL		0x01
 #define PCM1796_ZFGR		0x02
 /* register 23 */
 #define PCM1796_ID_MASK		0x1f

 static void pcm1796_write(struct oxygen *chip, unsigned int codec,
 			  u8 reg, u8 value)
 {
 	/* maps ALSA channel pair number to SPI output */
 	static const u8 codec_map[4] = {
 		0, 1, 2, 4
 	};
 	oxygen_write_spi(chip, OXYGEN_SPI_TRIGGER  |
 			 OXYGEN_SPI_DATA_LENGTH_2 |
 			 OXYGEN_SPI_CLOCK_160 |
 			 (codec_map[codec] << OXYGEN_SPI_CODEC_SHIFT) |
 			 OXYGEN_SPI_CEN_LATCH_CLOCK_HI,
 			 (reg << 8) | value);
 }

 static void xonar_init(struct oxygen *chip)
 {
 	unsigned int i;

 	for (i = 0; i < 4; ++i) {
 		pcm1796_write(chip, i, 18, PCM1796_FMT_24_LJUST | PCM1796_ATLD);
 		pcm1796_write(chip, i, 19, PCM1796_FLT_SHARP | PCM1796_ATS_1);
 		pcm1796_write(chip, i, 20, PCM1796_OS_64);
 		pcm1796_write(chip, i, 21, 0);
 		pcm1796_write(chip, i, 16, 0xff); /* set ATL/ATR after ATLD */
 		pcm1796_write(chip, i, 17, 0xff);
 	}

 	oxygen_set_bits16(chip, OXYGEN_GPIO_CONTROL,
 			  GPIO_CS5381_M_MASK | GPIO_ALT);
 	oxygen_write16_masked(chip, OXYGEN_GPIO_DATA,
 			      GPIO_CS5381_M_SINGLE,
 			      GPIO_CS5381_M_MASK | GPIO_ALT);
 	oxygen_ac97_set_bits(chip, 0, CM9780_JACK, CM9780_FMIC2MIC);
 	msleep(300);
 	oxygen_set_bits16(chip, OXYGEN_GPIO_CONTROL, GPIO_OUTPUT_ENABLE);
 	oxygen_set_bits16(chip, OXYGEN_GPIO_DATA, GPIO_OUTPUT_ENABLE);

 	snd_component_add(chip->card, "PCM1796");
 	snd_component_add(chip->card, "CS5381");
 }

 static void xonar_cleanup(struct oxygen *chip)
 {
 	oxygen_clear_bits16(chip, OXYGEN_GPIO_DATA, GPIO_OUTPUT_ENABLE);
 }

 static void set_pcm1796_params(struct oxygen *chip,
 			       struct snd_pcm_hw_params *params)
 {
 #if 0
 	unsigned int i;
 	u8 value;

 	value = params_rate(params) >= 96000 ? PCM1796_OS_32 : PCM1796_OS_64;
 	for (i = 0; i < 4; ++i)
 		pcm1796_write(chip, i, 20, value);
 #endif
 }

 static void update_pcm1796_volume(struct oxygen *chip)
 {
 	unsigned int i;

 	for (i = 0; i < 4; ++i) {
 		pcm1796_write(chip, i, 16, chip->dac_volume[i * 2]);
 		pcm1796_write(chip, i, 17, chip->dac_volume[i * 2 + 1]);
 	}
 }

 static void update_pcm1796_mute(struct oxygen *chip)
 {
 	unsigned int i;
 	u8 value;

 	value = PCM1796_FMT_24_LJUST | PCM1796_ATLD;
 	if (chip->dac_mute)
 		value |= PCM1796_MUTE;
 	for (i = 0; i < 4; ++i)
 		pcm1796_write(chip, i, 18, value);
 }

 static void set_cs5381_params(struct oxygen *chip,
 			      struct snd_pcm_hw_params *params)
 {
 	unsigned int value;

 	if (params_rate(params) <= 54000)
 		value = GPIO_CS5381_M_SINGLE;
 	else if (params_rate(params) <= 108000)
 		value = GPIO_CS5381_M_DOUBLE;
 	else
 		value = GPIO_CS5381_M_QUAD;
 	oxygen_write16_masked(chip, OXYGEN_GPIO_DATA,
 			      value, GPIO_CS5381_M_MASK);
 }

 static int pcm1796_volume_info(struct snd_kcontrol *ctl,
 			       struct snd_ctl_elem_info *info)
 {
 	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 	info->count = 8;
 	info->value.integer.min = 0x0f;
 	info->value.integer.max = 0xff;
 	return 0;
 }

 static int alt_switch_get(struct snd_kcontrol *ctl,
 			  struct snd_ctl_elem_value *value)
 {
 	struct oxygen *chip = ctl->private_data;

 	value->value.integer.value[0] =
 		!!(oxygen_read16(chip, OXYGEN_GPIO_DATA) & GPIO_ALT);
 	return 0;
 }

 static int alt_switch_put(struct snd_kcontrol *ctl,
 			  struct snd_ctl_elem_value *value)
 {
 	struct oxygen *chip = ctl->private_data;
 	u16 old_bits, new_bits;
 	int changed;

 	spin_lock_irq(&chip->reg_lock);
 	old_bits = oxygen_read16(chip, OXYGEN_GPIO_DATA);
 	if (value->value.integer.value[0])
 		new_bits = old_bits | GPIO_ALT;
 	else
 		new_bits = old_bits & ~GPIO_ALT;
 	changed = new_bits != old_bits;
 	if (changed)
 		oxygen_write16(chip, OXYGEN_GPIO_DATA, new_bits);
 	spin_unlock_irq(&chip->reg_lock);
 	return changed;
 }

 static const struct snd_kcontrol_new alt_switch = {
 	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 	.name = "Analog Loopback Switch",
 	.info = snd_ctl_boolean_mono_info,
 	.get = alt_switch_get,
 	.put = alt_switch_put,
 };

 static const DECLARE_TLV_DB_SCALE(pcm1796_db_scale, -12000, 50, 0);

 static int xonar_control_filter(struct snd_kcontrol_new *template)
 {
 	if (!strcmp(template->name, "Master Playback Volume")) {
 		template->access |= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
 		template->info = pcm1796_volume_info,
 		template->tlv.p = pcm1796_db_scale;
 	} else if (!strncmp(template->name, "CD Capture ", 11)) {
 		template->private_value ^= AC97_CD ^ AC97_VIDEO;
 	}
 	return 0;
 }

 static int xonar_mixer_init(struct oxygen *chip)
 {
 	return snd_ctl_add(chip->card, snd_ctl_new1(&alt_switch, chip));
 }

 static const struct oxygen_model model_xonar = {
 	.shortname = "Asus AV200",
 	.longname = "Asus Virtuoso 200",
 	.chip = "AV200",
 	.init = xonar_init,
 	.control_filter = xonar_control_filter,
 	.mixer_init = xonar_mixer_init,
 	.cleanup = xonar_cleanup,
 	.set_dac_params = set_pcm1796_params,
 	.set_adc_params = set_cs5381_params,
 	.update_dac_volume = update_pcm1796_volume,
 	.update_dac_mute = update_pcm1796_mute,
 	.dac_channels = 8,
 	.used_channels = OXYGEN_CHANNEL_B |
 			 OXYGEN_CHANNEL_C |
 			 OXYGEN_CHANNEL_SPDIF |
 			 OXYGEN_CHANNEL_MULTICH,
 	.function_flags = OXYGEN_FUNCTION_ENABLE_SPI_4_5,
 	.dac_i2s_format = OXYGEN_I2S_FORMAT_LJUST,
 	.adc_i2s_format = OXYGEN_I2S_FORMAT_LJUST,
 };

 static int __devinit xonar_probe(struct pci_dev *pci,
 				 const struct pci_device_id *pci_id)
 {
 	static int dev;
 	int err;

 	if (dev >= SNDRV_CARDS)
 		return -ENODEV;
 	if (!enable[dev]) {
 		++dev;
 		return -ENOENT;
 	}
 	err = oxygen_pci_probe(pci, index[dev], id[dev], 1, &model_xonar);
 	if (err >= 0)
 		++dev;
 	return err;
 }

 static struct pci_driver xonar_driver = {
 	.name = "AV200",
 	.id_table = xonar_ids,
 	.probe = xonar_probe,
 	.remove = __devexit_p(oxygen_pci_remove),
 };

 static int __init alsa_card_xonar_init(void)
 {
 	return pci_register_driver(&xonar_driver);
 }

 static void __exit alsa_card_xonar_exit(void)
 {
 	pci_unregister_driver(&xonar_driver);
 }

 module_init(alsa_card_xonar_init)
 module_exit(alsa_card_xonar_exit)
	/*
	* C-Media CMI8788 driver for Asus Xonar cards
	*
	* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
	*
	*
	* This driver is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2.
	*
	* This driver 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 driver; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	/*
	* CMI8788:
	*
	* SPI 0 -> 1st PCM1796 (front)
	* SPI 1 -> 2nd PCM1796 (surround)
	* SPI 2 -> 3rd PCM1796 (center/LFE)
	* SPI 4 -> 4th PCM1796 (back)
	*
	* GPIO 2 -> M0 of CS5381
	* GPIO 3 -> M1 of CS5381
	* GPIO 5 <- external power present (D2X only)
	* GPIO 7 -> ALT
	* GPIO 8 -> enable output to speakers
	*
	* CM9780:
	*
	* GPIO 0 -> enable AC'97 bypass (line in -> ADC)
	*/

	#include <linux/pci.h>
	#include <linux/delay.h>
	#include <linux/mutex.h>
	#include <sound/ac97_codec.h>
	#include <sound/control.h>
	#include <sound/core.h>
	#include <sound/initval.h>
	#include <sound/pcm.h>
	#include <sound/tlv.h>
	#include "oxygen.h"
	#include "cm9780.h"

	MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
	MODULE_DESCRIPTION("Asus AV200 driver");
	MODULE_LICENSE("GPL");
	MODULE_SUPPORTED_DEVICE("{{Asus,AV200}}");

	static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
	static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
	static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

	module_param_array(index, int, NULL, 0444);
	MODULE_PARM_DESC(index, "card index");
	module_param_array(id, charp, NULL, 0444);
	MODULE_PARM_DESC(id, "ID string");
	module_param_array(enable, bool, NULL, 0444);
	MODULE_PARM_DESC(enable, "enable card");

	static struct pci_device_id xonar_ids[] __devinitdata = {
	{ OXYGEN_PCI_SUBID(0x1043, 0x8269) }, /* Asus Xonar D2 */
	{ OXYGEN_PCI_SUBID(0x1043, 0x82b7) }, /* Asus Xonar D2X */
	{ }
	};
	MODULE_DEVICE_TABLE(pci, xonar_ids);


	#define GPIO_CS5381_M_MASK 0x000c
	#define GPIO_CS5381_M_SINGLE 0x0000
	#define GPIO_CS5381_M_DOUBLE 0x0004
	#define GPIO_CS5381_M_QUAD 0x0008
	#define GPIO_EXT_POWER 0x0020
	#define GPIO_ALT 0x0080
	#define GPIO_OUTPUT_ENABLE 0x0100

	/* register 16 */
	#define PCM1796_ATL_MASK 0xff
	/* register 17 */
	#define PCM1796_ATR_MASK 0xff
	/* register 18 */
	#define PCM1796_MUTE 0x01
	#define PCM1796_DME 0x02
	#define PCM1796_DMF_MASK 0x0c
	#define PCM1796_DMF_DISABLED 0x00
	#define PCM1796_DMF_48 0x04
	#define PCM1796_DMF_441 0x08
	#define PCM1796_DMF_32 0x0c
	#define PCM1796_FMT_MASK 0x70
	#define PCM1796_FMT_16_RJUST 0x00
	#define PCM1796_FMT_20_RJUST 0x10
	#define PCM1796_FMT_24_RJUST 0x20
	#define PCM1796_FMT_24_LJUST 0x30
	#define PCM1796_FMT_16_I2S 0x40
	#define PCM1796_FMT_24_I2S 0x50
	#define PCM1796_ATLD 0x80
	/* register 19 */
	#define PCM1796_INZD 0x01
	#define PCM1796_FLT_MASK 0x02
	#define PCM1796_FLT_SHARP 0x00
	#define PCM1796_FLT_SLOW 0x02
	#define PCM1796_DFMS 0x04
	#define PCM1796_OPE 0x10
	#define PCM1796_ATS_MASK 0x60
	#define PCM1796_ATS_1 0x00
	#define PCM1796_ATS_2 0x20
	#define PCM1796_ATS_4 0x40
	#define PCM1796_ATS_8 0x60
	#define PCM1796_REV 0x80
	/* register 20 */
	#define PCM1796_OS_MASK 0x03
	#define PCM1796_OS_64 0x00
	#define PCM1796_OS_32 0x01
	#define PCM1796_OS_128 0x02
	#define PCM1796_CHSL_MASK 0x04
	#define PCM1796_CHSL_LEFT 0x00
	#define PCM1796_CHSL_RIGHT 0x04
	#define PCM1796_MONO 0x08
	#define PCM1796_DFTH 0x10
	#define PCM1796_DSD 0x20
	#define PCM1796_SRST 0x40
	/* register 21 */
	#define PCM1796_PCMZ 0x01
	#define PCM1796_DZ_MASK 0x06
	/* register 22 */
	#define PCM1796_ZFGL 0x01
	#define PCM1796_ZFGR 0x02
	/* register 23 */
	#define PCM1796_ID_MASK 0x1f

	static void pcm1796_write(struct oxygen *chip, unsigned int codec,
	u8 reg, u8 value)
	{
	/* maps ALSA channel pair number to SPI output */
	static const u8 codec_map[4] = {
	0, 1, 2, 4
	};
	oxygen_write_spi(chip, OXYGEN_SPI_TRIGGER \|
	OXYGEN_SPI_DATA_LENGTH_2 \|
	OXYGEN_SPI_CLOCK_160 \|
	(codec_map[codec] << OXYGEN_SPI_CODEC_SHIFT) \|
	OXYGEN_SPI_CEN_LATCH_CLOCK_HI,
	(reg << 8) \| value);
	}

	static void xonar_init(struct oxygen *chip)
	{
	unsigned int i;

	for (i = 0; i < 4; ++i) {
	pcm1796_write(chip, i, 18, PCM1796_FMT_24_LJUST \| PCM1796_ATLD);
	pcm1796_write(chip, i, 19, PCM1796_FLT_SHARP \| PCM1796_ATS_1);
	pcm1796_write(chip, i, 20, PCM1796_OS_64);
	pcm1796_write(chip, i, 21, 0);
	pcm1796_write(chip, i, 16, 0xff); /* set ATL/ATR after ATLD */
	pcm1796_write(chip, i, 17, 0xff);
	}

	oxygen_set_bits16(chip, OXYGEN_GPIO_CONTROL,
	GPIO_CS5381_M_MASK \| GPIO_ALT);
	oxygen_write16_masked(chip, OXYGEN_GPIO_DATA,
	GPIO_CS5381_M_SINGLE,
	GPIO_CS5381_M_MASK \| GPIO_ALT);
	oxygen_ac97_set_bits(chip, 0, CM9780_JACK, CM9780_FMIC2MIC);
	msleep(300);
	oxygen_set_bits16(chip, OXYGEN_GPIO_CONTROL, GPIO_OUTPUT_ENABLE);
	oxygen_set_bits16(chip, OXYGEN_GPIO_DATA, GPIO_OUTPUT_ENABLE);

	snd_component_add(chip->card, "PCM1796");
	snd_component_add(chip->card, "CS5381");
	}

	static void xonar_cleanup(struct oxygen *chip)
	{
	oxygen_clear_bits16(chip, OXYGEN_GPIO_DATA, GPIO_OUTPUT_ENABLE);
	}

	static void set_pcm1796_params(struct oxygen *chip,
	struct snd_pcm_hw_params *params)
	{
	#if 0
	unsigned int i;
	u8 value;

	value = params_rate(params) >= 96000 ? PCM1796_OS_32 : PCM1796_OS_64;
	for (i = 0; i < 4; ++i)
	pcm1796_write(chip, i, 20, value);
	#endif
	}

	static void update_pcm1796_volume(struct oxygen *chip)
	{
	unsigned int i;

	for (i = 0; i < 4; ++i) {
	pcm1796_write(chip, i, 16, chip->dac_volume[i * 2]);
	pcm1796_write(chip, i, 17, chip->dac_volume[i * 2 + 1]);
	}
	}

	static void update_pcm1796_mute(struct oxygen *chip)
	{
	unsigned int i;
	u8 value;

	value = PCM1796_FMT_24_LJUST \| PCM1796_ATLD;
	if (chip->dac_mute)
	value \|= PCM1796_MUTE;
	for (i = 0; i < 4; ++i)
	pcm1796_write(chip, i, 18, value);
	}

	static void set_cs5381_params(struct oxygen *chip,
	struct snd_pcm_hw_params *params)
	{
	unsigned int value;

	if (params_rate(params) <= 54000)
	value = GPIO_CS5381_M_SINGLE;
	else if (params_rate(params) <= 108000)
	value = GPIO_CS5381_M_DOUBLE;
	else
	value = GPIO_CS5381_M_QUAD;
	oxygen_write16_masked(chip, OXYGEN_GPIO_DATA,
	value, GPIO_CS5381_M_MASK);
	}

	static int pcm1796_volume_info(struct snd_kcontrol *ctl,
	struct snd_ctl_elem_info *info)
	{
	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	info->count = 8;
	info->value.integer.min = 0x0f;
	info->value.integer.max = 0xff;
	return 0;
	}

	static int alt_switch_get(struct snd_kcontrol *ctl,
	struct snd_ctl_elem_value *value)
	{
	struct oxygen *chip = ctl->private_data;

	value->value.integer.value[0] =
	!!(oxygen_read16(chip, OXYGEN_GPIO_DATA) & GPIO_ALT);
	return 0;
	}

	static int alt_switch_put(struct snd_kcontrol *ctl,
	struct snd_ctl_elem_value *value)
	{
	struct oxygen *chip = ctl->private_data;
	u16 old_bits, new_bits;
	int changed;

	spin_lock_irq(&chip->reg_lock);
	old_bits = oxygen_read16(chip, OXYGEN_GPIO_DATA);
	if (value->value.integer.value[0])
	new_bits = old_bits \| GPIO_ALT;
	else
	new_bits = old_bits & ~GPIO_ALT;
	changed = new_bits != old_bits;
	if (changed)
	oxygen_write16(chip, OXYGEN_GPIO_DATA, new_bits);
	spin_unlock_irq(&chip->reg_lock);
	return changed;
	}

	static const struct snd_kcontrol_new alt_switch = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "Analog Loopback Switch",
	.info = snd_ctl_boolean_mono_info,
	.get = alt_switch_get,
	.put = alt_switch_put,
	};

	static const DECLARE_TLV_DB_SCALE(pcm1796_db_scale, -12000, 50, 0);

	static int xonar_control_filter(struct snd_kcontrol_new *template)
	{
	if (!strcmp(template->name, "Master Playback Volume")) {
	template->access \|= SNDRV_CTL_ELEM_ACCESS_TLV_READ;
	template->info = pcm1796_volume_info,
	template->tlv.p = pcm1796_db_scale;
	} else if (!strncmp(template->name, "CD Capture ", 11)) {
	template->private_value ^= AC97_CD ^ AC97_VIDEO;
	}
	return 0;
	}

	static int xonar_mixer_init(struct oxygen *chip)
	{
	return snd_ctl_add(chip->card, snd_ctl_new1(&alt_switch, chip));
	}

	static const struct oxygen_model model_xonar = {
	.shortname = "Asus AV200",
	.longname = "Asus Virtuoso 200",
	.chip = "AV200",
	.init = xonar_init,
	.control_filter = xonar_control_filter,
	.mixer_init = xonar_mixer_init,
	.cleanup = xonar_cleanup,
	.set_dac_params = set_pcm1796_params,
	.set_adc_params = set_cs5381_params,
	.update_dac_volume = update_pcm1796_volume,
	.update_dac_mute = update_pcm1796_mute,
	.dac_channels = 8,
	.used_channels = OXYGEN_CHANNEL_B \|
	OXYGEN_CHANNEL_C \|
	OXYGEN_CHANNEL_SPDIF \|
	OXYGEN_CHANNEL_MULTICH,
	.function_flags = OXYGEN_FUNCTION_ENABLE_SPI_4_5,
	.dac_i2s_format = OXYGEN_I2S_FORMAT_LJUST,
	.adc_i2s_format = OXYGEN_I2S_FORMAT_LJUST,
	};

	static int __devinit xonar_probe(struct pci_dev *pci,
	const struct pci_device_id *pci_id)
	{
	static int dev;
	int err;

	if (dev >= SNDRV_CARDS)
	return -ENODEV;
	if (!enable[dev]) {
	++dev;
	return -ENOENT;
	}
	err = oxygen_pci_probe(pci, index[dev], id[dev], 1, &model_xonar);
	if (err >= 0)
	++dev;
	return err;
	}

	static struct pci_driver xonar_driver = {
	.name = "AV200",
	.id_table = xonar_ids,
	.probe = xonar_probe,
	.remove = __devexit_p(oxygen_pci_remove),
	};

	static int __init alsa_card_xonar_init(void)
	{
	return pci_register_driver(&xonar_driver);
	}

	static void __exit alsa_card_xonar_exit(void)
	{
	pci_unregister_driver(&xonar_driver);
	}

	module_init(alsa_card_xonar_init)
	module_exit(alsa_card_xonar_exit)