ALSA: add DICE driver

As a start point for further development, this is an incomplete driver
for DICE devices:
- only playback (so no clock source except the bus clock)
- only 44.1 kHz
- no MIDI
- recovery after bus reset is slow
- hwdep device is created, but not actually implemented

Contains compilation fixes by Stefan Richter.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 51 insertions, 0 deletions

diff --git a/include/uapi/sound/firewire.h b/include/uapi/sound/firewire.h
new file mode 100644
index 000000000000..e86131ca49e5
--- /dev/null
+++ b/include/uapi/sound/firewire.h
@@ -0,0 +1,51 @@
+#ifndef UAPI_SOUND_FIREWIRE_H_INCLUDED
+#define UAPI_SOUND_FIREWIRE_H_INCLUDED
+
+#include <linux/ioctl.h>
+
+/* events can be read() from the hwdep device */
+
+#define SNDRV_FIREWIRE_EVENT_LOCK_STATUS        0x000010cc
+#define SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION  0xd1ce004e
+
+struct snd_firewire_event_common {
+        unsigned int type; /* SNDRV_FIREWIRE_EVENT_xxx */
+};
+
+struct snd_firewire_event_lock_status {
+        unsigned int type;
+        unsigned int status; /* 0/1 = unlocked/locked */
+};
+
+struct snd_firewire_event_dice_notification {
+        unsigned int type;
+        unsigned int notification; /* DICE-specific bits */
+};
+
+union snd_firewire_event {
+        struct snd_firewire_event_common            common;
+        struct snd_firewire_event_lock_status       lock_status;
+        struct snd_firewire_event_dice_notification dice_notification;
+};
+
+
+#define SNDRV_FIREWIRE_IOCTL_GET_INFO _IOR('H', 0xf8, struct snd_firewire_get_info)
+#define SNDRV_FIREWIRE_IOCTL_LOCK      _IO('H', 0xf9)
+#define SNDRV_FIREWIRE_IOCTL_UNLOCK    _IO('H', 0xfa)
+
+#define SNDRV_FIREWIRE_TYPE_DICE        1
+/* Fireworks, AV/C, RME, MOTU, ... */
+
+struct snd_firewire_get_info {
+        unsigned int type; /* SNDRV_FIREWIRE_TYPE_xxx */
+        unsigned int card; /* same as fw_cdev_get_info.card */
+        unsigned char guid[8];
+        char device_name[16]; /* device node in /dev */
+};
+
+/*
+ * SNDRV_FIREWIRE_IOCTL_LOCK prevents the driver from streaming.
+ * Returns -EBUSY if the driver is already streaming.
+ */
+
+#endif