[ALSA] add CMI8788 driver

Add the snd-oxygen driver for the C-Media CMI8788 (Oxygen) chip, used on
the Asound A-8788, AuzenTech X-Meridian, Bgears b-Enspirer,
Club3D Theatron DTS, HT-Omega Claro, Razer Barracuda AC-1,
Sondigo Inferno, and TempoTec HIFIER sound cards.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 623 insertions, 0 deletions

diff --git a/sound/pci/oxygen/oxygen_mixer.c b/sound/pci/oxygen/oxygen_mixer.c
new file mode 100644
index 00000000000..e252abac004
--- /dev/null
+++ b/sound/pci/oxygen/oxygen_mixer.c
@@ -0,0 +1,623 @@
+/*
+ * C-Media CMI8788 driver - mixer code
+ *
+ * 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
+ */
+
+#include <sound/driver.h>
+#include <linux/mutex.h>
+#include <sound/ac97_codec.h>
+#include <sound/asoundef.h>
+#include <sound/control.h>
+#include <sound/tlv.h>
+#include "oxygen.h"
+
+static int dac_volume_info(struct snd_kcontrol *ctl,
+			   struct snd_ctl_elem_info *info)
+{
+	struct oxygen *chip = ctl->private_data;
+
+	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	info->count = 8;
+	info->value.integer.min = chip->model->dac_minimum_volume;
+	info->value.integer.max = 0xff;
+	return 0;
+}
+
+static int dac_volume_get(struct snd_kcontrol *ctl,
+			  struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	unsigned int i;
+
+	mutex_lock(&chip->mutex);
+	for (i = 0; i < 8; ++i)
+		value->value.integer.value[i] = chip->dac_volume[i];
+	mutex_unlock(&chip->mutex);
+	return 0;
+}
+
+static int dac_volume_put(struct snd_kcontrol *ctl,
+			  struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	unsigned int i;
+	int changed;
+
+	changed = 0;
+	mutex_lock(&chip->mutex);
+	for (i = 0; i < 8; ++i)
+		if (value->value.integer.value[i] != chip->dac_volume[i]) {
+			chip->dac_volume[i] = value->value.integer.value[i];
+			changed = 1;
+		}
+	if (changed)
+		chip->model->update_dac_volume(chip);
+	mutex_unlock(&chip->mutex);
+	return changed;
+}
+
+static int dac_mute_get(struct snd_kcontrol *ctl,
+			struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+
+	mutex_lock(&chip->mutex);
+	value->value.integer.value[0] = !chip->dac_mute;
+	mutex_unlock(&chip->mutex);
+	return 0;
+}
+
+static int dac_mute_put(struct snd_kcontrol *ctl,
+			  struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	int changed;
+
+	mutex_lock(&chip->mutex);
+	changed = !value->value.integer.value[0] != chip->dac_mute;
+	if (changed) {
+		chip->dac_mute = !value->value.integer.value[0];
+		chip->model->update_dac_mute(chip);
+	}
+	mutex_unlock(&chip->mutex);
+	return changed;
+}
+
+static int upmix_info(struct snd_kcontrol *ctl, struct snd_ctl_elem_info *info)
+{
+	static const char *const names[3] = {
+		"Front", "Front+Rear", "Front+Rear+Side"
+	};
+	info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	info->count = 1;
+	info->value.enumerated.items = 3;
+	if (info->value.enumerated.item > 2)
+		info->value.enumerated.item = 2;
+	strcpy(info->value.enumerated.name, names[info->value.enumerated.item]);
+	return 0;
+}
+
+static int upmix_get(struct snd_kcontrol *ctl, struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+
+	mutex_lock(&chip->mutex);
+	value->value.enumerated.item[0] = chip->dac_routing;
+	mutex_unlock(&chip->mutex);
+	return 0;
+}
+
+void oxygen_update_dac_routing(struct oxygen *chip)
+{
+	/*
+	 * hardware channel order: front, side, center/lfe, rear
+	 * ALSA channel order:     front, rear, center/lfe, side
+	 */
+	static const unsigned int reg_values[3] = {
+		0x6c00, 0x2c00, 0x2000
+	};
+	unsigned int reg_value;
+
+	if ((oxygen_read8(chip, OXYGEN_PLAY_CHANNELS) &
+	     OXYGEN_PLAY_CHANNELS_MASK) == OXYGEN_PLAY_CHANNELS_2)
+		reg_value = reg_values[chip->dac_routing];
+	else
+		reg_value = 0x6c00;
+	oxygen_write16_masked(chip, OXYGEN_PLAY_ROUTING, reg_value, 0xff00);
+}
+
+static int upmix_put(struct snd_kcontrol *ctl, struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	int changed;
+
+	mutex_lock(&chip->mutex);
+	changed = value->value.enumerated.item[0] != chip->dac_routing;
+	if (changed) {
+		chip->dac_routing = min(value->value.enumerated.item[0], 2u);
+		spin_lock_irq(&chip->reg_lock);
+		oxygen_update_dac_routing(chip);
+		spin_unlock_irq(&chip->reg_lock);
+	}
+	mutex_unlock(&chip->mutex);
+	return changed;
+}
+
+static int spdif_switch_get(struct snd_kcontrol *ctl,
+			    struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+
+	mutex_lock(&chip->mutex);
+	value->value.integer.value[0] = chip->spdif_playback_enable;
+	mutex_unlock(&chip->mutex);
+	return 0;
+}
+
+static unsigned int oxygen_spdif_rate(unsigned int oxygen_rate)
+{
+	switch (oxygen_rate) {
+	case OXYGEN_RATE_32000:
+		return IEC958_AES3_CON_FS_32000 << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	case OXYGEN_RATE_44100:
+		return IEC958_AES3_CON_FS_44100 << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	default: /* OXYGEN_RATE_48000 */
+		return IEC958_AES3_CON_FS_48000 << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	case OXYGEN_RATE_64000:
+		return 0xb << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	case OXYGEN_RATE_88200:
+		return 0x8 << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	case OXYGEN_RATE_96000:
+		return 0xa << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	case OXYGEN_RATE_176400:
+		return 0xc << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	case OXYGEN_RATE_192000:
+		return 0xe << OXYGEN_SPDIF_CS_RATE_SHIFT;
+	}
+}
+
+void oxygen_update_spdif_source(struct oxygen *chip)
+{
+	u32 old_control, new_control;
+	u16 old_routing, new_routing;
+	unsigned int oxygen_rate;
+
+	old_control = oxygen_read32(chip, OXYGEN_SPDIF_CONTROL);
+	old_routing = oxygen_read16(chip, OXYGEN_PLAY_ROUTING);
+	if (chip->pcm_active & (1 << PCM_SPDIF)) {
+		new_control = old_control | OXYGEN_SPDIF_OUT_ENABLE;
+		new_routing = (old_routing & ~0x00e0) | 0x0000;
+		oxygen_rate = (old_control >> OXYGEN_SPDIF_OUT_RATE_SHIFT)
+			& OXYGEN_I2S_RATE_MASK;
+		/* S/PDIF rate was already set by the caller */
+	} else if ((chip->pcm_active & (1 << PCM_MULTICH)) &&
+		   chip->spdif_playback_enable) {
+		new_routing = (old_routing & ~0x00e0) | 0x0020;
+		oxygen_rate = oxygen_read16(chip, OXYGEN_I2S_MULTICH_FORMAT)
+			& OXYGEN_I2S_RATE_MASK;
+		new_control = (old_control & ~OXYGEN_SPDIF_OUT_RATE_MASK) |
+			(oxygen_rate << OXYGEN_SPDIF_OUT_RATE_SHIFT) |
+			OXYGEN_SPDIF_OUT_ENABLE;
+	} else {
+		new_control = old_control & ~OXYGEN_SPDIF_OUT_ENABLE;
+		new_routing = old_routing;
+		oxygen_rate = OXYGEN_RATE_44100;
+	}
+	if (old_routing != new_routing) {
+		oxygen_write32(chip, OXYGEN_SPDIF_CONTROL,
+			       new_control & ~OXYGEN_SPDIF_OUT_ENABLE);
+		oxygen_write16(chip, OXYGEN_PLAY_ROUTING, new_routing);
+	}
+	if (new_control & OXYGEN_SPDIF_OUT_ENABLE)
+		oxygen_write32(chip, OXYGEN_SPDIF_OUTPUT_BITS,
+			       oxygen_spdif_rate(oxygen_rate) |
+			       ((chip->pcm_active & (1 << PCM_SPDIF)) ?
+				chip->spdif_pcm_bits : chip->spdif_bits));
+	oxygen_write32(chip, OXYGEN_SPDIF_CONTROL, new_control);
+}
+
+static int spdif_switch_put(struct snd_kcontrol *ctl,
+			    struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	int changed;
+
+	mutex_lock(&chip->mutex);
+	changed = value->value.integer.value[0] != chip->spdif_playback_enable;
+	if (changed) {
+		chip->spdif_playback_enable = !!value->value.integer.value[0];
+		spin_lock_irq(&chip->reg_lock);
+		oxygen_update_spdif_source(chip);
+		spin_unlock_irq(&chip->reg_lock);
+	}
+	mutex_unlock(&chip->mutex);
+	return changed;
+}
+
+static int spdif_info(struct snd_kcontrol *ctl, struct snd_ctl_elem_info *info)
+{
+	info->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+	info->count = 1;
+	return 0;
+}
+
+static void oxygen_to_iec958(u32 bits, struct snd_ctl_elem_value *value)
+{
+	value->value.iec958.status[0] =
+		bits & (OXYGEN_SPDIF_NONAUDIO | OXYGEN_SPDIF_C |
+			OXYGEN_SPDIF_PREEMPHASIS);
+	value->value.iec958.status[1] = /* category and original */
+		bits >> OXYGEN_SPDIF_CATEGORY_SHIFT;
+}
+
+static u32 iec958_to_oxygen(struct snd_ctl_elem_value *value)
+{
+	u32 bits;
+
+	bits = value->value.iec958.status[0] &
+		(OXYGEN_SPDIF_NONAUDIO | OXYGEN_SPDIF_C |
+		 OXYGEN_SPDIF_PREEMPHASIS);
+	bits |= value->value.iec958.status[1] << OXYGEN_SPDIF_CATEGORY_SHIFT;
+	if (bits & OXYGEN_SPDIF_NONAUDIO)
+		bits |= OXYGEN_SPDIF_V;
+	return bits;
+}
+
+static inline void write_spdif_bits(struct oxygen *chip, u32 bits)
+{
+	oxygen_write32_masked(chip, OXYGEN_SPDIF_OUTPUT_BITS, bits,
+			      OXYGEN_SPDIF_NONAUDIO |
+			      OXYGEN_SPDIF_C |
+			      OXYGEN_SPDIF_PREEMPHASIS |
+			      OXYGEN_SPDIF_CATEGORY_MASK |
+			      OXYGEN_SPDIF_ORIGINAL |
+			      OXYGEN_SPDIF_V);
+}
+
+static int spdif_default_get(struct snd_kcontrol *ctl,
+			     struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+
+	mutex_lock(&chip->mutex);
+	oxygen_to_iec958(chip->spdif_bits, value);
+	mutex_unlock(&chip->mutex);
+	return 0;
+}
+
+static int spdif_default_put(struct snd_kcontrol *ctl,
+			     struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	u32 new_bits;
+	int changed;
+
+	new_bits = iec958_to_oxygen(value);
+	mutex_lock(&chip->mutex);
+	changed = new_bits != chip->spdif_bits;
+	if (changed) {
+		chip->spdif_bits = new_bits;
+		if (!(chip->pcm_active & (1 << PCM_SPDIF)))
+			write_spdif_bits(chip, new_bits);
+	}
+	mutex_unlock(&chip->mutex);
+	return changed;
+}
+
+static int spdif_mask_get(struct snd_kcontrol *ctl,
+			  struct snd_ctl_elem_value *value)
+{
+	value->value.iec958.status[0] = IEC958_AES0_NONAUDIO |
+		IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS;
+	value->value.iec958.status[1] =
+		IEC958_AES1_CON_CATEGORY | IEC958_AES1_CON_ORIGINAL;
+	return 0;
+}
+
+static int spdif_pcm_get(struct snd_kcontrol *ctl,
+			 struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+
+	mutex_lock(&chip->mutex);
+	oxygen_to_iec958(chip->spdif_pcm_bits, value);
+	mutex_unlock(&chip->mutex);
+	return 0;
+}
+
+static int spdif_pcm_put(struct snd_kcontrol *ctl,
+			 struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	u32 new_bits;
+	int changed;
+
+	new_bits = iec958_to_oxygen(value);
+	mutex_lock(&chip->mutex);
+	changed = new_bits != chip->spdif_pcm_bits;
+	if (changed) {
+		chip->spdif_pcm_bits = new_bits;
+		if (chip->pcm_active & (1 << PCM_SPDIF))
+			write_spdif_bits(chip, new_bits);
+	}
+	mutex_unlock(&chip->mutex);
+	return changed;
+}
+
+static int spdif_input_mask_get(struct snd_kcontrol *ctl,
+				struct snd_ctl_elem_value *value)
+{
+	value->value.iec958.status[0] = 0xff;
+	value->value.iec958.status[1] = 0xff;
+	value->value.iec958.status[2] = 0xff;
+	value->value.iec958.status[3] = 0xff;
+	return 0;
+}
+
+static int spdif_input_default_get(struct snd_kcontrol *ctl,
+				   struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	u32 bits;
+
+	bits = oxygen_read32(chip, OXYGEN_SPDIF_INPUT_BITS);
+	value->value.iec958.status[0] = bits;
+	value->value.iec958.status[1] = bits >> 8;
+	value->value.iec958.status[2] = bits >> 16;
+	value->value.iec958.status[3] = bits >> 24;
+	return 0;
+}
+
+static int ac97_switch_get(struct snd_kcontrol *ctl,
+			   struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	unsigned int index = ctl->private_value & 0xff;
+	unsigned int bitnr = (ctl->private_value >> 8) & 0xff;
+	int invert = ctl->private_value & (1 << 16);
+	u16 reg;
+
+	mutex_lock(&chip->mutex);
+	reg = oxygen_read_ac97(chip, 0, index);
+	mutex_unlock(&chip->mutex);
+	if (!(reg & (1 << bitnr)) ^ !invert)
+		value->value.integer.value[0] = 1;
+	else
+		value->value.integer.value[0] = 0;
+	return 0;
+}
+
+static int ac97_switch_put(struct snd_kcontrol *ctl,
+			   struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	unsigned int index = ctl->private_value & 0xff;
+	unsigned int bitnr = (ctl->private_value >> 8) & 0xff;
+	int invert = ctl->private_value & (1 << 16);
+	u16 oldreg, newreg;
+	int change;
+
+	mutex_lock(&chip->mutex);
+	oldreg = oxygen_read_ac97(chip, 0, index);
+	newreg = oldreg;
+	if (!value->value.integer.value[0] ^ !invert)
+		newreg |= 1 << bitnr;
+	else
+		newreg &= ~(1 << bitnr);
+	change = newreg != oldreg;
+	if (change) {
+		oxygen_write_ac97(chip, 0, index, newreg);
+		if (index == AC97_LINE)
+			oxygen_write_ac97_masked(chip, 0, 0x72,
+						 !!(newreg & 0x8000), 0x0001);
+	}
+	mutex_unlock(&chip->mutex);
+	return change;
+}
+
+static int ac97_volume_info(struct snd_kcontrol *ctl,
+			    struct snd_ctl_elem_info *info)
+{
+	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	info->count = 2;
+	info->value.integer.min = 0;
+	info->value.integer.max = 0x1f;
+	return 0;
+}
+
+static int ac97_volume_get(struct snd_kcontrol *ctl,
+			   struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	unsigned int index = ctl->private_value;
+	u16 reg;
+
+	mutex_lock(&chip->mutex);
+	reg = oxygen_read_ac97(chip, 0, index);
+	mutex_unlock(&chip->mutex);
+	value->value.integer.value[0] = 31 - (reg & 0x1f);
+	value->value.integer.value[1] = 31 - ((reg >> 8) & 0x1f);
+	return 0;
+}
+
+static int ac97_volume_put(struct snd_kcontrol *ctl,
+			   struct snd_ctl_elem_value *value)
+{
+	struct oxygen *chip = ctl->private_data;
+	unsigned int index = ctl->private_value;
+	u16 oldreg, newreg;
+	int change;
+
+	mutex_lock(&chip->mutex);
+	oldreg = oxygen_read_ac97(chip, 0, index);
+	newreg = oldreg;
+	newreg = (newreg & ~0x1f) |
+		(31 - (value->value.integer.value[0] & 0x1f));
+	newreg = (newreg & ~0x1f00) |
+		((31 - (value->value.integer.value[0] & 0x1f)) << 8);
+	change = newreg != oldreg;
+	if (change)
+		oxygen_write_ac97(chip, 0, index, newreg);
+	mutex_unlock(&chip->mutex);
+	return change;
+}
+
+#define AC97_SWITCH(xname, index, bitnr, invert) { \
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+		.name = xname, \
+		.info = snd_ctl_boolean_mono_info, \
+		.get = ac97_switch_get, \
+		.put = ac97_switch_put, \
+		.private_value = ((invert) << 16) | ((bitnr) << 8) | (index), \
+	}
+#define AC97_VOLUME(xname, index) { \
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
+		.name = xname, \
+		.info = ac97_volume_info, \
+		.get = ac97_volume_get, \
+		.put = ac97_volume_put, \
+		.tlv = { .p = ac97_db_scale, }, \
+		.private_value = (index), \
+	}
+
+static DECLARE_TLV_DB_SCALE(ac97_db_scale, -3450, 150, 0);
+
+static const struct snd_kcontrol_new controls[] = {
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = "PCM Playback Volume",
+		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+			  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
+		.info = dac_volume_info,
+		.get = dac_volume_get,
+		.put = dac_volume_put,
+		.tlv = {
+			.p = NULL, /* set later */
+		},
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = "PCM Playback Switch",
+		.info = snd_ctl_boolean_mono_info,
+		.get = dac_mute_get,
+		.put = dac_mute_put,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = "Stereo Upmixing",
+		.info = upmix_info,
+		.get = upmix_get,
+		.put = upmix_put,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, SWITCH),
+		.info = snd_ctl_boolean_mono_info,
+		.get = spdif_switch_get,
+		.put = spdif_switch_put,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.device = 1,
+		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
+		.info = spdif_info,
+		.get = spdif_default_get,
+		.put = spdif_default_put,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.device = 1,
+		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, CON_MASK),
+		.access = SNDRV_CTL_ELEM_ACCESS_READ,
+		.info = spdif_info,
+		.get = spdif_mask_get,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.device = 1,
+		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, PCM_STREAM),
+		.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+			  SNDRV_CTL_ELEM_ACCESS_INACTIVE,
+		.info = spdif_info,
+		.get = spdif_pcm_get,
+		.put = spdif_pcm_put,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.device = 1,
+		.name = SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
+		.access = SNDRV_CTL_ELEM_ACCESS_READ,
+		.info = spdif_info,
+		.get = spdif_input_mask_get,
+	},
+	{
+		.iface = SNDRV_CTL_ELEM_IFACE_PCM,
+		.device = 1,
+		.name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
+		.access = SNDRV_CTL_ELEM_ACCESS_READ,
+		.info = spdif_info,
+		.get = spdif_input_default_get,
+	},
+	AC97_VOLUME("Mic Capture Volume", AC97_MIC),
+	AC97_SWITCH("Mic Capture Switch", AC97_MIC, 15, 1),
+	AC97_SWITCH("Mic Boost (+20dB)", AC97_MIC, 6, 0),
+	AC97_SWITCH("Line Capture Switch", AC97_LINE, 15, 1),
+	AC97_VOLUME("CD Capture Volume", AC97_CD),
+	AC97_SWITCH("CD Capture Switch", AC97_CD, 15, 1),
+	AC97_VOLUME("Aux Capture Volume", AC97_AUX),
+	AC97_SWITCH("Aux Capture Switch", AC97_AUX, 15, 1),
+};
+
+static void oxygen_any_ctl_free(struct snd_kcontrol *ctl)
+{
+	struct oxygen *chip = ctl->private_data;
+
+	/* I'm too lazy to write a function for each control :-) */
+	chip->spdif_pcm_ctl = NULL;
+	chip->spdif_input_bits_ctl = NULL;
+}
+
+int oxygen_mixer_init(struct oxygen *chip)
+{
+	unsigned int i;
+	struct snd_kcontrol *ctl;
+	int err;
+
+	for (i = 0; i < ARRAY_SIZE(controls); ++i) {
+		ctl = snd_ctl_new1(&controls[i], chip);
+		if (!ctl)
+			return -ENOMEM;
+		if (!strcmp(ctl->id.name, "PCM Playback Volume"))
+			ctl->tlv.p = chip->model->dac_tlv;
+		else if (chip->model->cd_in_from_video_in &&
+			 !strncmp(ctl->id.name, "CD Capture ", 11))
+			ctl->private_value ^= AC97_CD ^ AC97_VIDEO;
+		err = snd_ctl_add(chip->card, ctl);
+		if (err < 0)
+			return err;
+		if (!strcmp(ctl->id.name,
+			    SNDRV_CTL_NAME_IEC958("", PLAYBACK, PCM_STREAM))) {
+			chip->spdif_pcm_ctl = ctl;
+			ctl->private_free = oxygen_any_ctl_free;
+		} else if (!strcmp(ctl->id.name,
+				 SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT))) {
+			chip->spdif_input_bits_ctl = ctl;
+			ctl->private_free = oxygen_any_ctl_free;
+		}
+	}
+	return chip->model->mixer_init ? chip->model->mixer_init(chip) : 0;
+}