ALSA: bebob: Add support for M-Audio special Firewire series

This commit allows this driver to support some models which M-Audio produces
with DM1000 but its firmware is special. They are:
 - Firewire 1814
 - ProjectMix I/O

They have heavily customized firmware. The usual operations can't be applied to
them. For this reason, this commit adds a model specific member to 'struct
snd_bebob' and some model specific functions. Some parameters are write-only so
this commit also adds control interface for applications to set them.

M-Audio special firmware quirks:
 - Just after powering on, they wait to download firmware. This state is
   changed when receiving cue. Then bus reset is generated and the device is
   recognized as a different model with the uploaded firmware.
 - They don't respond against BridgeCo AV/C extension commands. So drivers
   can't get their stream formations and so on.
 - They do not start to transmit packets only by establishing connection but
   also by receiving SIGNAL FORMAT command.
 - After booting up, they often fail to send response against driver's request
   due to mismatch of gap_count.

This module don't support to upload firmware.

Tested-by: Darren Anderson <darrena092@gmail.com> (ProjectMix I/O)
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

4 files changed, 608 insertions, 11 deletions

diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c
index 9bf9149194df..ffb042b1f19f 100644
--- a/sound/firewire/bebob/bebob.c
+++ b/sound/firewire/bebob/bebob.c
@@ -60,6 +60,8 @@ static DECLARE_BITMAP(devices_used, SNDRV_CARDS);
 
 #define MODEL_FOCUSRITE_SAFFIRE_BOTH    0x00000000
 #define MODEL_MAUDIO_AUDIOPHILE_BOTH    0x00010060
+#define MODEL_MAUDIO_FW1814             0x00010071
+#define MODEL_MAUDIO_PROJECTMIX         0x00010091
 
 static int
 name_device(struct snd_bebob *bebob, unsigned int vendor_id)
@@ -210,7 +212,14 @@ bebob_probe(struct fw_unit *unit,
         if (err < 0)
                 goto error;
 
-        err = snd_bebob_stream_discover(bebob);
+        if ((entry->vendor_id == VEN_MAUDIO1) &&
+            (entry->model_id == MODEL_MAUDIO_FW1814))
+                err = snd_bebob_maudio_special_discover(bebob, true);
+        else if ((entry->vendor_id == VEN_MAUDIO1) &&
+                 (entry->model_id == MODEL_MAUDIO_PROJECTMIX))
+                err = snd_bebob_maudio_special_discover(bebob, false);
+        else
+                err = snd_bebob_stream_discover(bebob);
         if (err < 0)
                 goto error;
 
@@ -270,6 +279,8 @@ static void bebob_remove(struct fw_unit *unit)
         if (bebob == NULL)
                 return;
 
+        kfree(bebob->maudio_special_quirk);
+
         snd_bebob_stream_destroy_duplex(bebob);
         snd_card_disconnect(bebob->card);
         snd_card_free_when_closed(bebob->card);
@@ -375,6 +386,12 @@ static const struct ieee1394_device_id bebob_id_table[] = {
         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO1, 0x00010081, &maudio_nrv10_spec),
         /* M-Audio, ProFireLightbridge */
         SND_BEBOB_DEV_ENTRY(VEN_MAUDIO1, 0x000100a1, &spec_normal),
+        /* Firewire 1814 */
+        SND_BEBOB_DEV_ENTRY(VEN_MAUDIO1, MODEL_MAUDIO_FW1814,
+                            &maudio_special_spec),
+        /* M-Audio ProjectMix */
+        SND_BEBOB_DEV_ENTRY(VEN_MAUDIO1, MODEL_MAUDIO_PROJECTMIX,
+                            &maudio_special_spec),
         /* IDs are unknown but able to be supported */
         /*  Apogee, Mini-ME Firewire */
         /*  Apogee, Mini-DAC Firewire */
diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index a851639ead45..eba012958b5c 100644
--- a/sound/firewire/bebob/bebob.h
+++ b/sound/firewire/bebob/bebob.h
@@ -106,6 +106,9 @@ struct snd_bebob {
         int dev_lock_count;
         bool dev_lock_changed;
         wait_queue_head_t hwdep_wait;
+
+        /* for M-Audio special devices */
+        void *maudio_special_quirk;
 };
 
 static inline int
@@ -237,6 +240,8 @@ extern struct snd_bebob_spec maudio_audiophile_spec;
 extern struct snd_bebob_spec maudio_solo_spec;
 extern struct snd_bebob_spec maudio_ozonic_spec;
 extern struct snd_bebob_spec maudio_nrv10_spec;
+extern struct snd_bebob_spec maudio_special_spec;
+int snd_bebob_maudio_special_discover(struct snd_bebob *bebob, bool is1814);
 
 #define SND_BEBOB_DEV_ENTRY(vendor, model, data) \
 { \
diff --git a/sound/firewire/bebob/bebob_maudio.c b/sound/firewire/bebob/bebob_maudio.c
index dededb35fbd7..544094b22c6d 100644
--- a/sound/firewire/bebob/bebob_maudio.c
+++ b/sound/firewire/bebob/bebob_maudio.c
@@ -7,9 +7,10 @@
  */
 
 #include "./bebob.h"
+#include <sound/control.h>
 
 /*
- * Just powering on, Firewire 410/Audiophile wait to
+ * Just powering on, Firewire 410/Audiophile/1814 and ProjectMix I/O wait to
  * download firmware blob. To enable these devices, drivers should upload
  * firmware blob and send a command to initialize configuration to factory
  * settings when completing uploading. Then these devices generate bus reset
@@ -22,6 +23,12 @@
  * Without streaming, the devices except for Firewire Audiophile can mix any
  * input and output. For this reason, Audiophile cannot be used as standalone
  * mixer.
+ *
+ * Firewire 1814 and ProjectMix I/O uses special firmware. It will be freezed
+ * when receiving any commands which the firmware can't understand. These
+ * devices utilize completely different system to control. It is some
+ * write-transaction directly into a certain address. All of addresses for mixer
+ * functionality is between 0xffc700700000 to 0xffc70070009c.
  */
 
 #define MAUDIO_SPECIFIC_ADDRESS 0xffc700000000
@@ -29,6 +36,7 @@
 #define METER_OFFSET            0x00600000
 
 /* some device has sync info after metering data */
+#define METER_SIZE_SPECIAL      84      /* with sync info */
 #define METER_SIZE_FW410        76      /* with sync info */
 #define METER_SIZE_AUDIOPHILE   60      /* with sync info */
 #define METER_SIZE_SOLO         52      /* with sync info */
@@ -50,6 +58,15 @@
 /* for NRV */
 #define UNKNOWN_METER   "Unknown"
 
+struct special_params {
+        bool is1814;
+        unsigned int clk_src;
+        unsigned int dig_in_fmt;
+        unsigned int dig_out_fmt;
+        unsigned int clk_lock;
+        struct snd_ctl_elem_id *ctl_id_sync;
+};
+
 static inline int
 get_meter(struct snd_bebob *bebob, void *buf, unsigned int size)
 {
@@ -58,6 +75,516 @@ get_meter(struct snd_bebob *bebob, void *buf, unsigned int size)
                                   buf, size, 0);
 }
 
+static int
+check_clk_sync(struct snd_bebob *bebob, unsigned int size, bool *sync)
+{
+        int err;
+        u8 *buf;
+
+        buf = kmalloc(size, GFP_KERNEL);
+        if (buf == NULL)
+                return -ENOMEM;
+
+        err = get_meter(bebob, buf, size);
+        if (err < 0)
+                goto end;
+
+        /* if synced, this value is the same as SFC of FDF in CIP header */
+        *sync = (buf[size - 2] != 0xff);
+end:
+        kfree(buf);
+        return err;
+}
+
+/*
+ * dig_fmt: 0x00:S/PDIF, 0x01:ADAT
+ * clk_lock: 0x00:unlock, 0x01:lock
+ */
+static int
+avc_maudio_set_special_clk(struct snd_bebob *bebob, unsigned int clk_src,
+                           unsigned int dig_in_fmt, unsigned int dig_out_fmt,
+                           unsigned int clk_lock)
+{
+        struct special_params *params = bebob->maudio_special_quirk;
+        int err;
+        u8 *buf;
+
+        if (amdtp_stream_running(&bebob->rx_stream) ||
+            amdtp_stream_running(&bebob->tx_stream))
+                return -EBUSY;
+
+        buf = kmalloc(12, GFP_KERNEL);
+        if (buf == NULL)
+                return -ENOMEM;
+
+        buf[0]  = 0x00;         /* CONTROL */
+        buf[1]  = 0xff;         /* UNIT */
+        buf[2]  = 0x00;         /* vendor dependent */
+        buf[3]  = 0x04;         /* company ID high */
+        buf[4]  = 0x00;         /* company ID middle */
+        buf[5]  = 0x04;         /* company ID low */
+        buf[6]  = 0xff & clk_src;       /* clock source */
+        buf[7]  = 0xff & dig_in_fmt;    /* input digital format */
+        buf[8]  = 0xff & dig_out_fmt;   /* output digital format */
+        buf[9]  = 0xff & clk_lock;      /* lock these settings */
+        buf[10] = 0x00;         /* padding  */
+        buf[11] = 0x00;         /* padding */
+
+        err = fcp_avc_transaction(bebob->unit, buf, 12, buf, 12,
+                                  BIT(1) | BIT(2) | BIT(3) | BIT(4) |
+                                  BIT(5) | BIT(6) | BIT(7) | BIT(8) |
+                                  BIT(9));
+        if ((err > 0) && (err < 10))
+                err = -EIO;
+        else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
+                err = -ENOSYS;
+        else if (buf[0] == 0x0a) /* REJECTED */
+                err = -EINVAL;
+        if (err < 0)
+                goto end;
+
+        params->clk_src         = buf[6];
+        params->dig_in_fmt      = buf[7];
+        params->dig_out_fmt     = buf[8];
+        params->clk_lock        = buf[9];
+
+        if (params->ctl_id_sync)
+                snd_ctl_notify(bebob->card, SNDRV_CTL_EVENT_MASK_VALUE,
+                               params->ctl_id_sync);
+
+        err = 0;
+end:
+        kfree(buf);
+        return err;
+}
+static void
+special_stream_formation_set(struct snd_bebob *bebob)
+{
+        static const unsigned int ch_table[2][2][3] = {
+                /* AMDTP_OUT_STREAM */
+                { {  6,  6,  4 },       /* SPDIF */
+                  { 12,  8,  4 } },     /* ADAT */
+                /* AMDTP_IN_STREAM */
+                { { 10, 10,  2 },       /* SPDIF */
+                  { 16, 12,  2 } }      /* ADAT */
+        };
+        struct special_params *params = bebob->maudio_special_quirk;
+        unsigned int i, max;
+
+        max = SND_BEBOB_STRM_FMT_ENTRIES - 1;
+        if (!params->is1814)
+                max -= 2;
+
+        for (i = 0; i < max; i++) {
+                bebob->tx_stream_formations[i + 1].pcm =
+                        ch_table[AMDTP_IN_STREAM][params->dig_in_fmt][i / 2];
+                bebob->tx_stream_formations[i + 1].midi = 1;
+
+                bebob->rx_stream_formations[i + 1].pcm =
+                        ch_table[AMDTP_OUT_STREAM][params->dig_out_fmt][i / 2];
+                bebob->rx_stream_formations[i + 1].midi = 1;
+        }
+}
+
+static int add_special_controls(struct snd_bebob *bebob);
+int
+snd_bebob_maudio_special_discover(struct snd_bebob *bebob, bool is1814)
+{
+        struct special_params *params;
+        int err;
+
+        params = kzalloc(sizeof(struct special_params), GFP_KERNEL);
+        if (params == NULL)
+                return -ENOMEM;
+
+        mutex_lock(&bebob->mutex);
+
+        bebob->maudio_special_quirk = (void *)params;
+        params->is1814 = is1814;
+
+        /* initialize these parameters because driver is not allowed to ask */
+        bebob->rx_stream.context = ERR_PTR(-1);
+        bebob->tx_stream.context = ERR_PTR(-1);
+        err = avc_maudio_set_special_clk(bebob, 0x03, 0x00, 0x00, 0x00);
+        if (err < 0) {
+                dev_err(&bebob->unit->device,
+                        "fail to initialize clock params: %d\n", err);
+                goto end;
+        }
+
+        err = add_special_controls(bebob);
+        if (err < 0)
+                goto end;
+
+        special_stream_formation_set(bebob);
+
+        if (params->is1814) {
+                bebob->midi_input_ports = 1;
+                bebob->midi_output_ports = 1;
+        } else {
+                bebob->midi_input_ports = 2;
+                bebob->midi_output_ports = 2;
+        }
+end:
+        if (err < 0) {
+                kfree(params);
+                bebob->maudio_special_quirk = NULL;
+        }
+        mutex_unlock(&bebob->mutex);
+        return err;
+}
+
+/* Input plug shows actual rate. Output plug is needless for this purpose. */
+static int special_get_rate(struct snd_bebob *bebob, unsigned int *rate)
+{
+        int err, trials;
+
+        trials = 0;
+        do {
+                err = avc_general_get_sig_fmt(bebob->unit, rate,
+                                              AVC_GENERAL_PLUG_DIR_IN, 0);
+        } while (err == -EAGAIN && ++trials < 3);
+
+        return err;
+}
+static int special_set_rate(struct snd_bebob *bebob, unsigned int rate)
+{
+        struct special_params *params = bebob->maudio_special_quirk;
+        int err;
+
+        err = avc_general_set_sig_fmt(bebob->unit, rate,
+                                      AVC_GENERAL_PLUG_DIR_OUT, 0);
+        if (err < 0)
+                goto end;
+
+        /*
+         * Just after changing sampling rate for output, a followed command
+         * for input is easy to fail. This is a workaround fot this issue.
+         */
+        msleep(100);
+
+        err = avc_general_set_sig_fmt(bebob->unit, rate,
+                                      AVC_GENERAL_PLUG_DIR_IN, 0);
+        if (err < 0)
+                goto end;
+
+        if (params->ctl_id_sync)
+                snd_ctl_notify(bebob->card, SNDRV_CTL_EVENT_MASK_VALUE,
+                               params->ctl_id_sync);
+end:
+        return err;
+}
+
+/* Clock source control for special firmware */
+static char *const special_clk_labels[] = {
+        SND_BEBOB_CLOCK_INTERNAL " with Digital Mute", "Digital",
+        "Word Clock", SND_BEBOB_CLOCK_INTERNAL};
+static int special_clk_get(struct snd_bebob *bebob, unsigned int *id)
+{
+        struct special_params *params = bebob->maudio_special_quirk;
+        *id = params->clk_src;
+        return 0;
+}
+static int special_clk_ctl_info(struct snd_kcontrol *kctl,
+                                struct snd_ctl_elem_info *einf)
+{
+        einf->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        einf->count = 1;
+        einf->value.enumerated.items = ARRAY_SIZE(special_clk_labels);
+
+        if (einf->value.enumerated.item >= einf->value.enumerated.items)
+                einf->value.enumerated.item = einf->value.enumerated.items - 1;
+
+        strcpy(einf->value.enumerated.name,
+               special_clk_labels[einf->value.enumerated.item]);
+
+        return 0;
+}
+static int special_clk_ctl_get(struct snd_kcontrol *kctl,
+                               struct snd_ctl_elem_value *uval)
+{
+        struct snd_bebob *bebob = snd_kcontrol_chip(kctl);
+        struct special_params *params = bebob->maudio_special_quirk;
+        uval->value.enumerated.item[0] = params->clk_src;
+        return 0;
+}
+static int special_clk_ctl_put(struct snd_kcontrol *kctl,
+                               struct snd_ctl_elem_value *uval)
+{
+        struct snd_bebob *bebob = snd_kcontrol_chip(kctl);
+        struct special_params *params = bebob->maudio_special_quirk;
+        int err, id;
+
+        mutex_lock(&bebob->mutex);
+
+        id = uval->value.enumerated.item[0];
+        if (id >= ARRAY_SIZE(special_clk_labels))
+                return 0;
+
+        err = avc_maudio_set_special_clk(bebob, id,
+                                         params->dig_in_fmt,
+                                         params->dig_out_fmt,
+                                         params->clk_lock);
+        mutex_unlock(&bebob->mutex);
+
+        return err >= 0;
+}
+static struct snd_kcontrol_new special_clk_ctl = {
+        .name   = "Clock Source",
+        .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .info   = special_clk_ctl_info,
+        .get    = special_clk_ctl_get,
+        .put    = special_clk_ctl_put
+};
+
+/* Clock synchronization control for special firmware */
+static int special_sync_ctl_info(struct snd_kcontrol *kctl,
+                                 struct snd_ctl_elem_info *einf)
+{
+        einf->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+        einf->count = 1;
+        einf->value.integer.min = 0;
+        einf->value.integer.max = 1;
+
+        return 0;
+}
+static int special_sync_ctl_get(struct snd_kcontrol *kctl,
+                                struct snd_ctl_elem_value *uval)
+{
+        struct snd_bebob *bebob = snd_kcontrol_chip(kctl);
+        int err;
+        bool synced = 0;
+
+        err = check_clk_sync(bebob, METER_SIZE_SPECIAL, &synced);
+        if (err >= 0)
+                uval->value.integer.value[0] = synced;
+
+        return 0;
+}
+static struct snd_kcontrol_new special_sync_ctl = {
+        .name   = "Sync Status",
+        .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READ,
+        .info   = special_sync_ctl_info,
+        .get    = special_sync_ctl_get,
+};
+
+/* Digital interface control for special firmware */
+static char *const special_dig_iface_labels[] = {
+        "S/PDIF Optical", "S/PDIF Coaxial", "ADAT Optical"
+};
+static int special_dig_in_iface_ctl_info(struct snd_kcontrol *kctl,
+                                         struct snd_ctl_elem_info *einf)
+{
+        einf->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        einf->count = 1;
+        einf->value.enumerated.items = ARRAY_SIZE(special_dig_iface_labels);
+
+        if (einf->value.enumerated.item >= einf->value.enumerated.items)
+                einf->value.enumerated.item = einf->value.enumerated.items - 1;
+
+        strcpy(einf->value.enumerated.name,
+               special_dig_iface_labels[einf->value.enumerated.item]);
+
+        return 0;
+}
+static int special_dig_in_iface_ctl_get(struct snd_kcontrol *kctl,
+                                        struct snd_ctl_elem_value *uval)
+{
+        struct snd_bebob *bebob = snd_kcontrol_chip(kctl);
+        struct special_params *params = bebob->maudio_special_quirk;
+        unsigned int dig_in_iface;
+        int err, val;
+
+        mutex_lock(&bebob->mutex);
+
+        err = avc_audio_get_selector(bebob->unit, 0x00, 0x04,
+                                     &dig_in_iface);
+        if (err < 0) {
+                dev_err(&bebob->unit->device,
+                        "fail to get digital input interface: %d\n", err);
+                goto end;
+        }
+
+        /* encoded id for user value */
+        val = (params->dig_in_fmt << 1) | (dig_in_iface & 0x01);
+
+        /* for ADAT Optical */
+        if (val > 2)
+                val = 2;
+
+        uval->value.enumerated.item[0] = val;
+end:
+        mutex_unlock(&bebob->mutex);
+        return err;
+}
+static int special_dig_in_iface_ctl_set(struct snd_kcontrol *kctl,
+                                        struct snd_ctl_elem_value *uval)
+{
+        struct snd_bebob *bebob = snd_kcontrol_chip(kctl);
+        struct special_params *params = bebob->maudio_special_quirk;
+        unsigned int id, dig_in_fmt, dig_in_iface;
+        int err;
+
+        mutex_lock(&bebob->mutex);
+
+        id = uval->value.enumerated.item[0];
+
+        /* decode user value */
+        dig_in_fmt = (id >> 1) & 0x01;
+        dig_in_iface = id & 0x01;
+
+        err = avc_maudio_set_special_clk(bebob,
+                                         params->clk_src,
+                                         dig_in_fmt,
+                                         params->dig_out_fmt,
+                                         params->clk_lock);
+        if ((err < 0) || (params->dig_in_fmt > 0)) /* ADAT */
+                goto end;
+
+        err = avc_audio_set_selector(bebob->unit, 0x00, 0x04, dig_in_iface);
+        if (err < 0)
+                dev_err(&bebob->unit->device,
+                        "fail to set digital input interface: %d\n", err);
+end:
+        special_stream_formation_set(bebob);
+        mutex_unlock(&bebob->mutex);
+        return err;
+}
+static struct snd_kcontrol_new special_dig_in_iface_ctl = {
+        .name   = "Digital Input Interface",
+        .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .info   = special_dig_in_iface_ctl_info,
+        .get    = special_dig_in_iface_ctl_get,
+        .put    = special_dig_in_iface_ctl_set
+};
+
+static int special_dig_out_iface_ctl_info(struct snd_kcontrol *kctl,
+                                          struct snd_ctl_elem_info *einf)
+{
+        einf->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+        einf->count = 1;
+        einf->value.enumerated.items = ARRAY_SIZE(special_dig_iface_labels) - 1;
+
+        if (einf->value.enumerated.item >= einf->value.enumerated.items)
+                einf->value.enumerated.item = einf->value.enumerated.items - 1;
+
+        strcpy(einf->value.enumerated.name,
+               special_dig_iface_labels[einf->value.enumerated.item + 1]);
+
+        return 0;
+}
+static int special_dig_out_iface_ctl_get(struct snd_kcontrol *kctl,
+                                         struct snd_ctl_elem_value *uval)
+{
+        struct snd_bebob *bebob = snd_kcontrol_chip(kctl);
+        struct special_params *params = bebob->maudio_special_quirk;
+        mutex_lock(&bebob->mutex);
+        uval->value.enumerated.item[0] = params->dig_out_fmt;
+        mutex_unlock(&bebob->mutex);
+        return 0;
+}
+static int special_dig_out_iface_ctl_set(struct snd_kcontrol *kctl,
+                                         struct snd_ctl_elem_value *uval)
+{
+        struct snd_bebob *bebob = snd_kcontrol_chip(kctl);
+        struct special_params *params = bebob->maudio_special_quirk;
+        unsigned int id;
+        int err;
+
+        mutex_lock(&bebob->mutex);
+
+        id = uval->value.enumerated.item[0];
+
+        err = avc_maudio_set_special_clk(bebob,
+                                         params->clk_src,
+                                         params->dig_in_fmt,
+                                         id, params->clk_lock);
+        if (err >= 0)
+                special_stream_formation_set(bebob);
+
+        mutex_unlock(&bebob->mutex);
+        return err;
+}
+static struct snd_kcontrol_new special_dig_out_iface_ctl = {
+        .name   = "Digital Output Interface",
+        .iface  = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+        .info   = special_dig_out_iface_ctl_info,
+        .get    = special_dig_out_iface_ctl_get,
+        .put    = special_dig_out_iface_ctl_set
+};
+
+static int add_special_controls(struct snd_bebob *bebob)
+{
+        struct snd_kcontrol *kctl;
+        struct special_params *params = bebob->maudio_special_quirk;
+        int err;
+
+        kctl = snd_ctl_new1(&special_clk_ctl, bebob);
+        err = snd_ctl_add(bebob->card, kctl);
+        if (err < 0)
+                goto end;
+
+        kctl = snd_ctl_new1(&special_sync_ctl, bebob);
+        err = snd_ctl_add(bebob->card, kctl);
+        if (err < 0)
+                goto end;
+        params->ctl_id_sync = &kctl->id;
+
+        kctl = snd_ctl_new1(&special_dig_in_iface_ctl, bebob);
+        err = snd_ctl_add(bebob->card, kctl);
+        if (err < 0)
+                goto end;
+
+        kctl = snd_ctl_new1(&special_dig_out_iface_ctl, bebob);
+        err = snd_ctl_add(bebob->card, kctl);
+end:
+        return err;
+}
+
+/* Hardware metering for special firmware */
+static char *const special_meter_labels[] = {
+        ANA_IN, ANA_IN, ANA_IN, ANA_IN,
+        SPDIF_IN,
+        ADAT_IN, ADAT_IN, ADAT_IN, ADAT_IN,
+        ANA_OUT, ANA_OUT,
+        SPDIF_OUT,
+        ADAT_OUT, ADAT_OUT, ADAT_OUT, ADAT_OUT,
+        HP_OUT, HP_OUT,
+        AUX_OUT
+};
+static int
+special_meter_get(struct snd_bebob *bebob, u32 *target, unsigned int size)
+{
+        u16 *buf;
+        unsigned int i, c, channels;
+        int err;
+
+        channels = ARRAY_SIZE(special_meter_labels) * 2;
+        if (size < channels * sizeof(u32))
+                return -EINVAL;
+
+        /* omit last 4 bytes because it's clock info. */
+        buf = kmalloc(METER_SIZE_SPECIAL - 4, GFP_KERNEL);
+        if (buf == NULL)
+                return -ENOMEM;
+
+        err = get_meter(bebob, (void *)buf, METER_SIZE_SPECIAL - 4);
+        if (err < 0)
+                goto end;
+
+        /* Its format is u16 and some channels are unknown. */
+        i = 0;
+        for (c = 2; c < channels + 2; c++)
+                target[i++] = be16_to_cpu(buf[c]) << 16;
+end:
+        kfree(buf);
+        return err;
+}
+
 /* last 4 bytes are omitted because it's clock info. */
 static char *const fw410_meter_labels[] = {
         ANA_IN, DIG_IN,
@@ -115,6 +642,27 @@ end:
         return err;
 }
 
+/* for special customized devices */
+static struct snd_bebob_rate_spec special_rate_spec = {
+        .get    = &special_get_rate,
+        .set    = &special_set_rate,
+};
+static struct snd_bebob_clock_spec special_clk_spec = {
+        .num    = ARRAY_SIZE(special_clk_labels),
+        .labels = special_clk_labels,
+        .get    = &special_clk_get,
+};
+static struct snd_bebob_meter_spec special_meter_spec = {
+        .num    = ARRAY_SIZE(special_meter_labels),
+        .labels = special_meter_labels,
+        .get    = &special_meter_get
+};
+struct snd_bebob_spec maudio_special_spec = {
+        .clock  = &special_clk_spec,
+        .rate   = &special_rate_spec,
+        .meter  = &special_meter_spec
+};
+
 /* Firewire 410 specification */
 static struct snd_bebob_rate_spec usual_rate_spec = {
         .get    = &snd_bebob_stream_get_rate,
diff --git a/sound/firewire/bebob/bebob_stream.c b/sound/firewire/bebob/bebob_stream.c
index 5fc52706f7c5..2695b7899410 100644
--- a/sound/firewire/bebob/bebob_stream.c
+++ b/sound/firewire/bebob/bebob_stream.c
@@ -389,6 +389,10 @@ break_both_connections(struct snd_bebob *bebob)
         cmp_connection_break(&bebob->out_conn);
 
         bebob->connected = false;
+
+        /* These models seems to be in transition state for a longer time. */
+        if (bebob->maudio_special_quirk != NULL)
+                msleep(200);
 }
 
 static void
@@ -421,9 +425,11 @@ start_stream(struct snd_bebob *bebob, struct amdtp_stream *stream,
                 conn = &bebob->out_conn;
 
         /* channel mapping */
-        err = map_data_channels(bebob, stream);
-        if (err < 0)
-                goto end;
+        if (bebob->maudio_special_quirk == NULL) {
+                err = map_data_channels(bebob, stream);
+                if (err < 0)
+                        goto end;
+        }
 
         /* start amdtp stream */
         err = amdtp_stream_start(stream,
@@ -555,13 +561,17 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, int rate)
                  * NOTE:
                  * If establishing connections at first, Yamaha GO46
                  * (and maybe Terratec X24) don't generate sound.
+                 *
+                 * For firmware customized by M-Audio, refer to next NOTE.
                  */
-                err = rate_spec->set(bebob, rate);
-                if (err < 0) {
-                        dev_err(&bebob->unit->device,
-                                "fail to set sampling rate: %d\n",
-                                err);
-                        goto end;
+                if (bebob->maudio_special_quirk == NULL) {
+                        err = rate_spec->set(bebob, rate);
+                        if (err < 0) {
+                                dev_err(&bebob->unit->device,
+                                        "fail to set sampling rate: %d\n",
+                                        err);
+                                goto end;
+                        }
                 }
 
                 err = make_both_connections(bebob, rate);
@@ -576,6 +586,23 @@ int snd_bebob_stream_start_duplex(struct snd_bebob *bebob, int rate)
                         goto end;
                 }
 
+                /*
+                 * NOTE:
+                 * The firmware customized by M-Audio uses these commands to
+                 * start transmitting stream. This is not usual way.
+                 */
+                if (bebob->maudio_special_quirk != NULL) {
+                        err = rate_spec->set(bebob, rate);
+                        if (err < 0) {
+                                dev_err(&bebob->unit->device,
+                                        "fail to ensure sampling rate: %d\n",
+                                        err);
+                                amdtp_stream_stop(master);
+                                break_both_connections(bebob);
+                                goto end;
+                        }
+                }
+
                 /* wait first callback */
                 if (!amdtp_stream_wait_callback(master, CALLBACK_TIMEOUT)) {
                         amdtp_stream_stop(master);