[ALSA] snd-aoa: add snd-aoa

This large patch adds all of snd-aoa.
Consisting of many modules, it currently replaces snd-powermac
for all layout-id based machines and handles many more (for
example new powerbooks and powermacs with digital output that
previously couldn't be used at all).
It also has support for all layout-IDs that Apple has (judging
from their Info.plist file) but not all are tested.
The driver currently has 2 known regressions over snd-powermac:
 * it doesn't handle powermac 7,2 and 7,3
 * it doesn't have a DRC control on snapper-based machines
I will fix those during the 2.6.18 development cycle.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 1113 insertions, 0 deletions

diff --git a/sound/aoa/codecs/snd-aoa-codec-onyx.c b/sound/aoa/codecs/snd-aoa-codec-onyx.c
new file mode 100644
index 000000000000..0b7650788f1f
--- /dev/null
+++ b/sound/aoa/codecs/snd-aoa-codec-onyx.c
@@ -0,0 +1,1113 @@
+/*
+ * Apple Onboard Audio driver for Onyx codec
+ *
+ * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
+ *
+ * GPL v2, can be found in COPYING.
+ *
+ *
+ * This is a driver for the pcm3052 codec chip (codenamed Onyx)
+ * that is present in newer Apple hardware (with digital output).
+ *
+ * The Onyx codec has the following connections (listed by the bit
+ * to be used in aoa_codec.connected):
+ *  0: analog output
+ *  1: digital output
+ *  2: line input
+ *  3: microphone input
+ * Note that even though I know of no machine that has for example
+ * the digital output connected but not the analog, I have handled
+ * all the different cases in the code so that this driver may serve
+ * as a good example of what to do.
+ *
+ * NOTE: This driver assumes that there's at most one chip to be
+ *       used with one alsa card, in form of creating all kinds
+ *       of mixer elements without regard for their existence.
+ *       But snd-aoa assumes that there's at most one card, so
+ *       this means you can only have one onyx on a system. This
+ *       should probably be fixed by changing the assumption of
+ *       having just a single card on a system, and making the
+ *       'card' pointer accessible to anyone who needs it instead
+ *       of hiding it in the aoa_snd_* functions...
+ *
+ */
+#include <linux/delay.h>
+#include <linux/module.h>
+MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("pcm3052 (onyx) codec driver for snd-aoa");
+
+#include "snd-aoa-codec-onyx.h"
+#include "../aoa.h"
+#include "../soundbus/soundbus.h"
+
+
+#define PFX "snd-aoa-codec-onyx: "
+
+struct onyx {
+        /* cache registers 65 to 80, they are write-only! */
+        u8                      cache[16];
+        struct i2c_client       i2c;
+        struct aoa_codec        codec;
+        u32                     initialised:1,
+                                spdif_locked:1,
+                                analog_locked:1,
+                                original_mute:2;
+        int                     open_count;
+        struct codec_info       *codec_info;
+
+        /* mutex serializes concurrent access to the device
+         * and this structure.
+         */
+        struct mutex mutex;
+};
+#define codec_to_onyx(c) container_of(c, struct onyx, codec)
+
+/* both return 0 if all ok, else on error */
+static int onyx_read_register(struct onyx *onyx, u8 reg, u8 *value)
+{
+        s32 v;
+
+        if (reg != ONYX_REG_CONTROL) {
+                *value = onyx->cache[reg-FIRSTREGISTER];
+                return 0;
+        }
+        v = i2c_smbus_read_byte_data(&onyx->i2c, reg);
+        if (v < 0)
+                return -1;
+        *value = (u8)v;
+        onyx->cache[ONYX_REG_CONTROL-FIRSTREGISTER] = *value;
+        return 0;
+}
+
+static int onyx_write_register(struct onyx *onyx, u8 reg, u8 value)
+{
+        int result;
+
+        result = i2c_smbus_write_byte_data(&onyx->i2c, reg, value);
+        if (!result)
+                onyx->cache[reg-FIRSTREGISTER] = value;
+        return result;
+}
+
+/* alsa stuff */
+
+static int onyx_dev_register(struct snd_device *dev)
+{
+        return 0;
+}
+
+static struct snd_device_ops ops = {
+        .dev_register = onyx_dev_register,
+};
+
+/* this is necessary because most alsa mixer programs
+ * can't properly handle the negative range */
+#define VOLUME_RANGE_SHIFT      128
+
+static int onyx_snd_vol_info(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+        uinfo->count = 2;
+        uinfo->value.integer.min = -128 + VOLUME_RANGE_SHIFT;
+        uinfo->value.integer.max = -1 + VOLUME_RANGE_SHIFT;
+        return 0;
+}
+
+static int onyx_snd_vol_get(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        s8 l, r;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_LEFT, &l);
+        onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT, &r);
+        mutex_unlock(&onyx->mutex);
+
+        ucontrol->value.integer.value[0] = l + VOLUME_RANGE_SHIFT;
+        ucontrol->value.integer.value[1] = r + VOLUME_RANGE_SHIFT;
+
+        return 0;
+}
+
+static int onyx_snd_vol_put(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        s8 l, r;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_LEFT, &l);
+        onyx_read_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT, &r);
+
+        if (l + VOLUME_RANGE_SHIFT == ucontrol->value.integer.value[0] &&
+            r + VOLUME_RANGE_SHIFT == ucontrol->value.integer.value[1]) {
+                mutex_unlock(&onyx->mutex);
+                return 0;
+        }
+
+        onyx_write_register(onyx, ONYX_REG_DAC_ATTEN_LEFT,
+                            ucontrol->value.integer.value[0]
+                             - VOLUME_RANGE_SHIFT);
+        onyx_write_register(onyx, ONYX_REG_DAC_ATTEN_RIGHT,
+                            ucontrol->value.integer.value[1]
+                             - VOLUME_RANGE_SHIFT);
+        mutex_unlock(&onyx->mutex);
+
+        return 1;
+}
+
+static struct snd_kcontrol_new volume_control = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "Master Playback Volume",
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .info = onyx_snd_vol_info,
+        .get = onyx_snd_vol_get,
+        .put = onyx_snd_vol_put,
+};
+
+/* like above, this is necessary because a lot
+ * of alsa mixer programs don't handle ranges
+ * that don't start at 0 properly.
+ * even alsamixer is one of them... */
+#define INPUTGAIN_RANGE_SHIFT   (-3)
+
+static int onyx_snd_inputgain_info(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+        uinfo->count = 1;
+        uinfo->value.integer.min = 3 + INPUTGAIN_RANGE_SHIFT;
+        uinfo->value.integer.max = 28 + INPUTGAIN_RANGE_SHIFT;
+        return 0;
+}
+
+static int onyx_snd_inputgain_get(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 ig;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &ig);
+        mutex_unlock(&onyx->mutex);
+
+        ucontrol->value.integer.value[0] =
+                (ig & ONYX_ADC_PGA_GAIN_MASK) + INPUTGAIN_RANGE_SHIFT;
+
+        return 0;
+}
+
+static int onyx_snd_inputgain_put(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 v, n;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
+        n = v;
+        n &= ~ONYX_ADC_PGA_GAIN_MASK;
+        n |= (ucontrol->value.integer.value[0] - INPUTGAIN_RANGE_SHIFT)
+                & ONYX_ADC_PGA_GAIN_MASK;
+        onyx_write_register(onyx, ONYX_REG_ADC_CONTROL, n);
+        mutex_unlock(&onyx->mutex);
+
+        return n != v;
+}
+
+static struct snd_kcontrol_new inputgain_control = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "Master Capture Volume",
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .info = onyx_snd_inputgain_info,
+        .get = onyx_snd_inputgain_get,
+        .put = onyx_snd_inputgain_put,
+};
+
+static int onyx_snd_capture_source_info(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_info *uinfo)
+{
+        static char *texts[] = { "Line-In", "Microphone" };
+
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        uinfo->count = 1;
+        uinfo->value.enumerated.items = 2;
+        if (uinfo->value.enumerated.item > 1)
+                uinfo->value.enumerated.item = 1;
+        strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
+        return 0;
+}
+
+static int onyx_snd_capture_source_get(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        s8 v;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
+        mutex_unlock(&onyx->mutex);
+
+        ucontrol->value.enumerated.item[0] = !!(v&ONYX_ADC_INPUT_MIC);
+
+        return 0;
+}
+
+static void onyx_set_capture_source(struct onyx *onyx, int mic)
+{
+        s8 v;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_ADC_CONTROL, &v);
+        v &= ~ONYX_ADC_INPUT_MIC;
+        if (mic)
+                v |= ONYX_ADC_INPUT_MIC;
+        onyx_write_register(onyx, ONYX_REG_ADC_CONTROL, v);
+        mutex_unlock(&onyx->mutex);
+}
+
+static int onyx_snd_capture_source_put(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        onyx_set_capture_source(snd_kcontrol_chip(kcontrol),
+                                ucontrol->value.enumerated.item[0]);
+        return 1;
+}
+
+static struct snd_kcontrol_new capture_source_control = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        /* If we name this 'Input Source', it properly shows up in
+         * alsamixer as a selection, * but it's shown under the 
+         * 'Playback' category.
+         * If I name it 'Capture Source', it shows up in strange
+         * ways (two bools of which one can be selected at a
+         * time) but at least it's shown in the 'Capture'
+         * category.
+         * I was told that this was due to backward compatibility,
+         * but I don't understand then why the mangling is *not*
+         * done when I name it "Input Source".....
+         */
+        .name = "Capture Source",
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .info = onyx_snd_capture_source_info,
+        .get = onyx_snd_capture_source_get,
+        .put = onyx_snd_capture_source_put,
+};
+
+static int onyx_snd_mute_info(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+        uinfo->count = 2;
+        uinfo->value.integer.min = 0;
+        uinfo->value.integer.max = 1;
+        return 0;
+}
+
+static int onyx_snd_mute_get(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 c;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &c);
+        mutex_unlock(&onyx->mutex);
+
+        ucontrol->value.integer.value[0] = !(c & ONYX_MUTE_LEFT);
+        ucontrol->value.integer.value[1] = !(c & ONYX_MUTE_RIGHT);
+
+        return 0;
+}
+
+static int onyx_snd_mute_put(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 v = 0, c = 0;
+        int err = -EBUSY;
+
+        mutex_lock(&onyx->mutex);
+        if (onyx->analog_locked)
+                goto out_unlock;
+
+        onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &v);
+        c = v;
+        c &= ~(ONYX_MUTE_RIGHT | ONYX_MUTE_LEFT);
+        if (!ucontrol->value.integer.value[0])
+                c |= ONYX_MUTE_LEFT;
+        if (!ucontrol->value.integer.value[1])
+                c |= ONYX_MUTE_RIGHT;
+        err = onyx_write_register(onyx, ONYX_REG_DAC_CONTROL, c);
+
+ out_unlock:
+        mutex_unlock(&onyx->mutex);
+
+        return !err ? (v != c) : err;
+}
+
+static struct snd_kcontrol_new mute_control = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "Master Playback Switch",
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .info = onyx_snd_mute_info,
+        .get = onyx_snd_mute_get,
+        .put = onyx_snd_mute_put,
+};
+
+
+static int onyx_snd_single_bit_info(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+        uinfo->count = 1;
+        uinfo->value.integer.min = 0;
+        uinfo->value.integer.max = 1;
+        return 0;
+}
+
+#define FLAG_POLARITY_INVERT    1
+#define FLAG_SPDIFLOCK          2
+
+static int onyx_snd_single_bit_get(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 c;
+        long int pv = kcontrol->private_value;
+        u8 polarity = (pv >> 16) & FLAG_POLARITY_INVERT;
+        u8 address = (pv >> 8) & 0xff;
+        u8 mask = pv & 0xff;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, address, &c);
+        mutex_unlock(&onyx->mutex);
+
+        ucontrol->value.integer.value[0] = !!(c & mask) ^ polarity;
+
+        return 0;
+}
+
+static int onyx_snd_single_bit_put(struct snd_kcontrol *kcontrol,
+        struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 v = 0, c = 0;
+        int err;
+        long int pv = kcontrol->private_value;
+        u8 polarity = (pv >> 16) & FLAG_POLARITY_INVERT;
+        u8 spdiflock = (pv >> 16) & FLAG_SPDIFLOCK;
+        u8 address = (pv >> 8) & 0xff;
+        u8 mask = pv & 0xff;
+
+        mutex_lock(&onyx->mutex);
+        if (spdiflock && onyx->spdif_locked) {
+                /* even if alsamixer doesn't care.. */
+                err = -EBUSY;
+                goto out_unlock;
+        }
+        onyx_read_register(onyx, address, &v);
+        c = v;
+        c &= ~(mask);
+        if (!!ucontrol->value.integer.value[0] ^ polarity)
+                c |= mask;
+        err = onyx_write_register(onyx, address, c);
+
+ out_unlock:
+        mutex_unlock(&onyx->mutex);
+
+        return !err ? (v != c) : err;
+}
+
+#define SINGLE_BIT(n, type, description, address, mask, flags)          \
+static struct snd_kcontrol_new n##_control = {                          \
+        .iface = SNDRV_CTL_ELEM_IFACE_##type,                           \
+        .name = description,                                            \
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,                      \
+        .info = onyx_snd_single_bit_info,                               \
+        .get = onyx_snd_single_bit_get,                                 \
+        .put = onyx_snd_single_bit_put,                                 \
+        .private_value = (flags << 16) | (address << 8) | mask          \
+}
+
+SINGLE_BIT(spdif,
+           MIXER,
+           SNDRV_CTL_NAME_IEC958("", PLAYBACK, SWITCH),
+           ONYX_REG_DIG_INFO4,
+           ONYX_SPDIF_ENABLE,
+           FLAG_SPDIFLOCK);
+SINGLE_BIT(ovr1,
+           MIXER,
+           "Oversampling Rate",
+           ONYX_REG_DAC_CONTROL,
+           ONYX_OVR1,
+           0);
+SINGLE_BIT(flt0,
+           MIXER,
+           "Fast Digital Filter Rolloff",
+           ONYX_REG_DAC_FILTER,
+           ONYX_ROLLOFF_FAST,
+           FLAG_POLARITY_INVERT);
+SINGLE_BIT(hpf,
+           MIXER,
+           "Highpass Filter",
+           ONYX_REG_ADC_HPF_BYPASS,
+           ONYX_HPF_DISABLE,
+           FLAG_POLARITY_INVERT);
+SINGLE_BIT(dm12,
+           MIXER,
+           "Digital De-Emphasis",
+           ONYX_REG_DAC_DEEMPH,
+           ONYX_DIGDEEMPH_CTRL,
+           0);
+
+static int onyx_spdif_info(struct snd_kcontrol *kcontrol,
+                           struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+        uinfo->count = 1;
+        return 0;
+}
+
+static int onyx_spdif_mask_get(struct snd_kcontrol *kcontrol,
+                               struct snd_ctl_elem_value *ucontrol)
+{
+        /* datasheet page 30, all others are 0 */
+        ucontrol->value.iec958.status[0] = 0x3e;
+        ucontrol->value.iec958.status[1] = 0xff;
+
+        ucontrol->value.iec958.status[3] = 0x3f;
+        ucontrol->value.iec958.status[4] = 0x0f;
+        
+        return 0;
+}
+
+static struct snd_kcontrol_new onyx_spdif_mask = {
+        .access =       SNDRV_CTL_ELEM_ACCESS_READ,
+        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
+        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,CON_MASK),
+        .info =         onyx_spdif_info,
+        .get =          onyx_spdif_mask_get,
+};
+
+static int onyx_spdif_get(struct snd_kcontrol *kcontrol,
+                          struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 v;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO1, &v);
+        ucontrol->value.iec958.status[0] = v & 0x3e;
+
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO2, &v);
+        ucontrol->value.iec958.status[1] = v;
+
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO3, &v);
+        ucontrol->value.iec958.status[3] = v & 0x3f;
+
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+        ucontrol->value.iec958.status[4] = v & 0x0f;
+        mutex_unlock(&onyx->mutex);
+
+        return 0;
+}
+
+static int onyx_spdif_put(struct snd_kcontrol *kcontrol,
+                          struct snd_ctl_elem_value *ucontrol)
+{
+        struct onyx *onyx = snd_kcontrol_chip(kcontrol);
+        u8 v;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO1, &v);
+        v = (v & ~0x3e) | (ucontrol->value.iec958.status[0] & 0x3e);
+        onyx_write_register(onyx, ONYX_REG_DIG_INFO1, v);
+
+        v = ucontrol->value.iec958.status[1];
+        onyx_write_register(onyx, ONYX_REG_DIG_INFO2, v);
+
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO3, &v);
+        v = (v & ~0x3f) | (ucontrol->value.iec958.status[3] & 0x3f);
+        onyx_write_register(onyx, ONYX_REG_DIG_INFO3, v);
+
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+        v = (v & ~0x0f) | (ucontrol->value.iec958.status[4] & 0x0f);
+        onyx_write_register(onyx, ONYX_REG_DIG_INFO4, v);
+        mutex_unlock(&onyx->mutex);
+
+        return 1;
+}
+
+static struct snd_kcontrol_new onyx_spdif_ctrl = {
+        .access =       SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .iface =        SNDRV_CTL_ELEM_IFACE_PCM,
+        .name =         SNDRV_CTL_NAME_IEC958("",PLAYBACK,DEFAULT),
+        .info =         onyx_spdif_info,
+        .get =          onyx_spdif_get,
+        .put =          onyx_spdif_put,
+};
+
+/* our registers */
+
+static u8 register_map[] = {
+        ONYX_REG_DAC_ATTEN_LEFT,
+        ONYX_REG_DAC_ATTEN_RIGHT,
+        ONYX_REG_CONTROL,
+        ONYX_REG_DAC_CONTROL,
+        ONYX_REG_DAC_DEEMPH,
+        ONYX_REG_DAC_FILTER,
+        ONYX_REG_DAC_OUTPHASE,
+        ONYX_REG_ADC_CONTROL,
+        ONYX_REG_ADC_HPF_BYPASS,
+        ONYX_REG_DIG_INFO1,
+        ONYX_REG_DIG_INFO2,
+        ONYX_REG_DIG_INFO3,
+        ONYX_REG_DIG_INFO4
+};
+
+static u8 initial_values[ARRAY_SIZE(register_map)] = {
+        0x80, 0x80, /* muted */
+        ONYX_MRST | ONYX_SRST, /* but handled specially! */
+        ONYX_MUTE_LEFT | ONYX_MUTE_RIGHT,
+        0, /* no deemphasis */
+        ONYX_DAC_FILTER_ALWAYS,
+        ONYX_OUTPHASE_INVERTED,
+        (-1 /*dB*/ + 8) & 0xF, /* line in selected, -1 dB gain*/
+        ONYX_ADC_HPF_ALWAYS,
+        (1<<2), /* pcm audio */
+        2,      /* category: pcm coder */
+        0,      /* sampling frequency 44.1 kHz, clock accuracy level II */
+        1       /* 24 bit depth */
+};
+
+/* reset registers of chip, either to initial or to previous values */
+static int onyx_register_init(struct onyx *onyx)
+{
+        int i;
+        u8 val;
+        u8 regs[sizeof(initial_values)];
+
+        if (!onyx->initialised) {
+                memcpy(regs, initial_values, sizeof(initial_values));
+                if (onyx_read_register(onyx, ONYX_REG_CONTROL, &val))
+                        return -1;
+                val &= ~ONYX_SILICONVERSION;
+                val |= initial_values[3];
+                regs[3] = val;
+        } else {
+                for (i=0; i<sizeof(register_map); i++)
+                        regs[i] = onyx->cache[register_map[i]-FIRSTREGISTER];
+        }
+
+        for (i=0; i<sizeof(register_map); i++) {
+                if (onyx_write_register(onyx, register_map[i], regs[i]))
+                        return -1;
+        }
+        onyx->initialised = 1;
+        return 0;
+}
+
+static struct transfer_info onyx_transfers[] = {
+        /* this is first so we can skip it if no input is present...
+         * No hardware exists with that, but it's here as an example
+         * of what to do :) */
+        {
+                /* analog input */
+                .formats = SNDRV_PCM_FMTBIT_S8 |
+                           SNDRV_PCM_FMTBIT_S16_BE |
+                           SNDRV_PCM_FMTBIT_S24_BE,
+                .rates = SNDRV_PCM_RATE_8000_96000,
+                .transfer_in = 1,
+                .must_be_clock_source = 0,
+                .tag = 0,
+        },
+        {
+                /* if analog and digital are currently off, anything should go,
+                 * so this entry describes everything we can do... */
+                .formats = SNDRV_PCM_FMTBIT_S8 |
+                           SNDRV_PCM_FMTBIT_S16_BE |
+                           SNDRV_PCM_FMTBIT_S24_BE
+#ifdef SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+                           | SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+#endif
+                ,
+                .rates = SNDRV_PCM_RATE_8000_96000,
+                .tag = 0,
+        },
+        {
+                /* analog output */
+                .formats = SNDRV_PCM_FMTBIT_S8 |
+                           SNDRV_PCM_FMTBIT_S16_BE |
+                           SNDRV_PCM_FMTBIT_S24_BE,
+                .rates = SNDRV_PCM_RATE_8000_96000,
+                .transfer_in = 0,
+                .must_be_clock_source = 0,
+                .tag = 1,
+        },
+        {
+                /* digital pcm output, also possible for analog out */
+                .formats = SNDRV_PCM_FMTBIT_S8 |
+                           SNDRV_PCM_FMTBIT_S16_BE |
+                           SNDRV_PCM_FMTBIT_S24_BE,
+                .rates = SNDRV_PCM_RATE_32000 |
+                         SNDRV_PCM_RATE_44100 |
+                         SNDRV_PCM_RATE_48000,
+                .transfer_in = 0,
+                .must_be_clock_source = 0,
+                .tag = 2,
+        },
+#ifdef SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+Once alsa gets supports for this kind of thing we can add it...
+        {
+                /* digital compressed output */
+                .formats =  SNDRV_PCM_FMTBIT_COMPRESSED_16BE,
+                .rates = SNDRV_PCM_RATE_32000 |
+                         SNDRV_PCM_RATE_44100 |
+                         SNDRV_PCM_RATE_48000,
+                .tag = 2,
+        },
+#endif
+        {}
+};
+
+static int onyx_usable(struct codec_info_item *cii,
+                       struct transfer_info *ti,
+                       struct transfer_info *out)
+{
+        u8 v;
+        struct onyx *onyx = cii->codec_data;
+        int spdif_enabled, analog_enabled;
+
+        mutex_lock(&onyx->mutex);
+        onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+        spdif_enabled = !!(v & ONYX_SPDIF_ENABLE);
+        onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &v);
+        analog_enabled = 
+                (v & (ONYX_MUTE_RIGHT|ONYX_MUTE_LEFT))
+                 != (ONYX_MUTE_RIGHT|ONYX_MUTE_LEFT);
+        mutex_unlock(&onyx->mutex);
+
+        switch (ti->tag) {
+        case 0: return 1;
+        case 1: return analog_enabled;
+        case 2: return spdif_enabled;
+        }
+        return 1;
+}
+
+static int onyx_prepare(struct codec_info_item *cii,
+                        struct bus_info *bi,
+                        struct snd_pcm_substream *substream)
+{
+        u8 v;
+        struct onyx *onyx = cii->codec_data;
+        int err = -EBUSY;
+
+        mutex_lock(&onyx->mutex);
+
+#ifdef SNDRV_PCM_FMTBIT_COMPRESSED_16BE
+        if (substream->runtime->format == SNDRV_PCM_FMTBIT_COMPRESSED_16BE) {
+                /* mute and lock analog output */
+                onyx_read_register(onyx, ONYX_REG_DAC_CONTROL, &v);
+                if (onyx_write_register(onyx
+                                        ONYX_REG_DAC_CONTROL,
+                                        v | ONYX_MUTE_RIGHT | ONYX_MUTE_LEFT))
+                        goto out_unlock;
+                onyx->analog_locked = 1;
+                err = 0;
+                goto out_unlock;
+        }
+#endif
+        switch (substream->runtime->rate) {
+        case 32000:
+        case 44100:
+        case 48000:
+                /* these rates are ok for all outputs */
+                /* FIXME: program spdif channel control bits here so that
+                 *        userspace doesn't have to if it only plays pcm! */
+                err = 0;
+                goto out_unlock;
+        default:
+                /* got some rate that the digital output can't do,
+                 * so disable and lock it */
+                onyx_read_register(cii->codec_data, ONYX_REG_DIG_INFO4, &v);
+                if (onyx_write_register(onyx,
+                                        ONYX_REG_DIG_INFO4,
+                                        v & ~ONYX_SPDIF_ENABLE))
+                        goto out_unlock;
+                onyx->spdif_locked = 1;
+                err = 0;
+                goto out_unlock;
+        }
+
+ out_unlock:
+        mutex_unlock(&onyx->mutex);
+
+        return err;
+}
+
+static int onyx_open(struct codec_info_item *cii,
+                     struct snd_pcm_substream *substream)
+{
+        struct onyx *onyx = cii->codec_data;
+
+        mutex_lock(&onyx->mutex);
+        onyx->open_count++;
+        mutex_unlock(&onyx->mutex);
+
+        return 0;
+}
+
+static int onyx_close(struct codec_info_item *cii,
+                      struct snd_pcm_substream *substream)
+{
+        struct onyx *onyx = cii->codec_data;
+
+        mutex_lock(&onyx->mutex);
+        onyx->open_count--;
+        if (!onyx->open_count)
+                onyx->spdif_locked = onyx->analog_locked = 0;
+        mutex_unlock(&onyx->mutex);
+
+        return 0;
+}
+
+static int onyx_switch_clock(struct codec_info_item *cii,
+                             enum clock_switch what)
+{
+        struct onyx *onyx = cii->codec_data;
+
+        mutex_lock(&onyx->mutex);
+        /* this *MUST* be more elaborate later... */
+        switch (what) {
+        case CLOCK_SWITCH_PREPARE_SLAVE:
+                onyx->codec.gpio->methods->all_amps_off(onyx->codec.gpio);
+                break;
+        case CLOCK_SWITCH_SLAVE:
+                onyx->codec.gpio->methods->all_amps_restore(onyx->codec.gpio);
+                break;
+        default: /* silence warning */
+                break;
+        }
+        mutex_unlock(&onyx->mutex);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int onyx_suspend(struct codec_info_item *cii, pm_message_t state)
+{
+        struct onyx *onyx = cii->codec_data;
+        u8 v;
+        int err = -ENXIO;
+
+        mutex_lock(&onyx->mutex);
+        if (onyx_read_register(onyx, ONYX_REG_CONTROL, &v))
+                goto out_unlock;
+        onyx_write_register(onyx, ONYX_REG_CONTROL, v | ONYX_ADPSV | ONYX_DAPSV);
+        /* Apple does a sleep here but the datasheet says to do it on resume */
+        err = 0;
+ out_unlock:
+        mutex_unlock(&onyx->mutex);
+
+        return err;
+}
+
+static int onyx_resume(struct codec_info_item *cii)
+{
+        struct onyx *onyx = cii->codec_data;
+        u8 v;
+        int err = -ENXIO;
+
+        mutex_lock(&onyx->mutex);
+        /* take codec out of suspend */
+        if (onyx_read_register(onyx, ONYX_REG_CONTROL, &v))
+                goto out_unlock;
+        onyx_write_register(onyx, ONYX_REG_CONTROL, v & ~(ONYX_ADPSV | ONYX_DAPSV));
+        /* FIXME: should divide by sample rate, but 8k is the lowest we go */
+        msleep(2205000/8000);
+        /* reset all values */
+        onyx_register_init(onyx);
+        err = 0;
+ out_unlock:
+        mutex_unlock(&onyx->mutex);
+
+        return err;
+}
+
+#endif /* CONFIG_PM */
+
+static struct codec_info onyx_codec_info = {
+        .transfers = onyx_transfers,
+        .sysclock_factor = 256,
+        .bus_factor = 64,
+        .owner = THIS_MODULE,
+        .usable = onyx_usable,
+        .prepare = onyx_prepare,
+        .open = onyx_open,
+        .close = onyx_close,
+        .switch_clock = onyx_switch_clock,
+#ifdef CONFIG_PM
+        .suspend = onyx_suspend,
+        .resume = onyx_resume,
+#endif
+};
+
+static int onyx_init_codec(struct aoa_codec *codec)
+{
+        struct onyx *onyx = codec_to_onyx(codec);
+        struct snd_kcontrol *ctl;
+        struct codec_info *ci = &onyx_codec_info;
+        u8 v;
+        int err;
+
+        if (!onyx->codec.gpio || !onyx->codec.gpio->methods) {
+                printk(KERN_ERR PFX "gpios not assigned!!\n");
+                return -EINVAL;
+        }
+
+        onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 0);
+        msleep(1);
+        onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 1);
+        msleep(1);
+        onyx->codec.gpio->methods->set_hw_reset(onyx->codec.gpio, 0);
+        msleep(1);
+        
+        if (onyx_register_init(onyx)) {
+                printk(KERN_ERR PFX "failed to initialise onyx registers\n");
+                return -ENODEV;
+        }
+
+        if (aoa_snd_device_new(SNDRV_DEV_LOWLEVEL, onyx, &ops)) {
+                printk(KERN_ERR PFX "failed to create onyx snd device!\n");
+                return -ENODEV;
+        }
+
+        /* nothing connected? what a joke! */
+        if ((onyx->codec.connected & 0xF) == 0)
+                return -ENOTCONN;
+
+        /* if no inputs are present... */
+        if ((onyx->codec.connected & 0xC) == 0) {
+                if (!onyx->codec_info)
+                        onyx->codec_info = kmalloc(sizeof(struct codec_info), GFP_KERNEL);
+                if (!onyx->codec_info)
+                        return -ENOMEM;
+                ci = onyx->codec_info;
+                *ci = onyx_codec_info;
+                ci->transfers++;
+        }
+
+        /* if no outputs are present... */
+        if ((onyx->codec.connected & 3) == 0) {
+                if (!onyx->codec_info)
+                        onyx->codec_info = kmalloc(sizeof(struct codec_info), GFP_KERNEL);
+                if (!onyx->codec_info)
+                        return -ENOMEM;
+                ci = onyx->codec_info;
+                /* this is fine as there have to be inputs
+                 * if we end up in this part of the code */
+                *ci = onyx_codec_info;
+                ci->transfers[1].formats = 0;
+        }
+
+        if (onyx->codec.soundbus_dev->attach_codec(onyx->codec.soundbus_dev,
+                                                   aoa_get_card(),
+                                                   ci, onyx)) {
+                printk(KERN_ERR PFX "error creating onyx pcm\n");
+                return -ENODEV;
+        }
+#define ADDCTL(n)                                                       \
+        do {                                                            \
+                ctl = snd_ctl_new1(&n, onyx);                           \
+                if (ctl) {                                              \
+                        ctl->id.device =                                \
+                                onyx->codec.soundbus_dev->pcm->device;  \
+                        err = aoa_snd_ctl_add(ctl);                     \
+                        if (err)                                        \
+                                goto error;                             \
+                }                                                       \
+        } while (0)
+
+        if (onyx->codec.soundbus_dev->pcm) {
+                /* give the user appropriate controls
+                 * depending on what inputs are connected */
+                if ((onyx->codec.connected & 0xC) == 0xC)
+                        ADDCTL(capture_source_control);
+                else if (onyx->codec.connected & 4)
+                        onyx_set_capture_source(onyx, 0);
+                else
+                        onyx_set_capture_source(onyx, 1);
+                if (onyx->codec.connected & 0xC)
+                        ADDCTL(inputgain_control);
+
+                /* depending on what output is connected,
+                 * give the user appropriate controls */
+                if (onyx->codec.connected & 1) {
+                        ADDCTL(volume_control);
+                        ADDCTL(mute_control);
+                        ADDCTL(ovr1_control);
+                        ADDCTL(flt0_control);
+                        ADDCTL(hpf_control);
+                        ADDCTL(dm12_control);
+                        /* spdif control defaults to off */
+                }
+                if (onyx->codec.connected & 2) {
+                        ADDCTL(onyx_spdif_mask);
+                        ADDCTL(onyx_spdif_ctrl);
+                }
+                if ((onyx->codec.connected & 3) == 3)
+                        ADDCTL(spdif_control);
+                /* if only S/PDIF is connected, enable it unconditionally */
+                if ((onyx->codec.connected & 3) == 2) {
+                        onyx_read_register(onyx, ONYX_REG_DIG_INFO4, &v);
+                        v |= ONYX_SPDIF_ENABLE;
+                        onyx_write_register(onyx, ONYX_REG_DIG_INFO4, v);
+                }
+        }
+#undef ADDCTL
+        printk(KERN_INFO PFX "attached to onyx codec via i2c\n");
+
+        return 0;
+ error:
+        onyx->codec.soundbus_dev->detach_codec(onyx->codec.soundbus_dev, onyx);
+        snd_device_free(aoa_get_card(), onyx);
+        return err;
+}
+
+static void onyx_exit_codec(struct aoa_codec *codec)
+{
+        struct onyx *onyx = codec_to_onyx(codec);
+
+        if (!onyx->codec.soundbus_dev) {
+                printk(KERN_ERR PFX "onyx_exit_codec called without soundbus_dev!\n");
+                return;
+        }
+        onyx->codec.soundbus_dev->detach_codec(onyx->codec.soundbus_dev, onyx);
+}
+
+static struct i2c_driver onyx_driver;
+
+static int onyx_create(struct i2c_adapter *adapter,
+                       struct device_node *node,
+                       int addr)
+{
+        struct onyx *onyx;
+        u8 dummy;
+
+        onyx = kzalloc(sizeof(struct onyx), GFP_KERNEL);
+
+        if (!onyx)
+                return -ENOMEM;
+
+        mutex_init(&onyx->mutex);
+        onyx->i2c.driver = &onyx_driver;
+        onyx->i2c.adapter = adapter;
+        onyx->i2c.addr = addr & 0x7f;
+        strlcpy(onyx->i2c.name, "onyx audio codec", I2C_NAME_SIZE-1);
+
+        if (i2c_attach_client(&onyx->i2c)) {
+                printk(KERN_ERR PFX "failed to attach to i2c\n");
+                goto fail;
+        }
+
+        /* we try to read from register ONYX_REG_CONTROL
+         * to check if the codec is present */
+        if (onyx_read_register(onyx, ONYX_REG_CONTROL, &dummy) != 0) {
+                i2c_detach_client(&onyx->i2c);
+                printk(KERN_ERR PFX "failed to read control register\n");
+                goto fail;
+        }
+
+        strlcpy(onyx->codec.name, "onyx", MAX_CODEC_NAME_LEN-1);
+        onyx->codec.owner = THIS_MODULE;
+        onyx->codec.init = onyx_init_codec;
+        onyx->codec.exit = onyx_exit_codec;
+        onyx->codec.node = of_node_get(node);
+
+        if (aoa_codec_register(&onyx->codec)) {
+                i2c_detach_client(&onyx->i2c);
+                goto fail;
+        }
+        printk(KERN_DEBUG PFX "created and attached onyx instance\n");
+        return 0;
+ fail:
+        kfree(onyx);
+        return -EINVAL;
+}
+
+static int onyx_i2c_attach(struct i2c_adapter *adapter)
+{
+        struct device_node *busnode, *dev = NULL;
+        struct pmac_i2c_bus *bus;
+
+        bus = pmac_i2c_adapter_to_bus(adapter);
+        if (bus == NULL)
+                return -ENODEV;
+        busnode = pmac_i2c_get_bus_node(bus);
+
+        while ((dev = of_get_next_child(busnode, dev)) != NULL) {
+                if (device_is_compatible(dev, "pcm3052")) {
+                        u32 *addr;
+                        printk(KERN_DEBUG PFX "found pcm3052\n");
+                        addr = (u32 *) get_property(dev, "reg", NULL);
+                        if (!addr)
+                                return -ENODEV;
+                        return onyx_create(adapter, dev, (*addr)>>1);
+                }
+        }
+
+        /* if that didn't work, try desperate mode for older
+         * machines that have stuff missing from the device tree */
+        
+        if (!device_is_compatible(busnode, "k2-i2c"))
+                return -ENODEV;
+
+        printk(KERN_DEBUG PFX "found k2-i2c, checking if onyx chip is on it\n");
+        /* probe both possible addresses for the onyx chip */
+        if (onyx_create(adapter, NULL, 0x46) == 0)
+                return 0;
+        return onyx_create(adapter, NULL, 0x47);
+}
+
+static int onyx_i2c_detach(struct i2c_client *client)
+{
+        struct onyx *onyx = container_of(client, struct onyx, i2c);
+        int err;
+
+        if ((err = i2c_detach_client(client)))
+                return err;
+        aoa_codec_unregister(&onyx->codec);
+        of_node_put(onyx->codec.node);
+        if (onyx->codec_info)
+                kfree(onyx->codec_info);
+        kfree(onyx);
+        return 0;
+}
+
+static struct i2c_driver onyx_driver = {
+        .driver = {
+                .name = "aoa_codec_onyx",
+                .owner = THIS_MODULE,
+        },
+        .attach_adapter = onyx_i2c_attach,
+        .detach_client = onyx_i2c_detach,
+};
+
+static int __init onyx_init(void)
+{
+        return i2c_add_driver(&onyx_driver);
+}
+
+static void __exit onyx_exit(void)
+{
+        i2c_del_driver(&onyx_driver);
+}
+
+module_init(onyx_init);
+module_exit(onyx_exit);