Digi 002/003 family uses asynchronous transaction for messaging. The address to transmit this message is stored on a certain register. This commit allocates a range of address on OHCI 1394 host controller to handle the messaging. As long as I know, the purpose of this message seems to notify lost of synchronization. While, the meaning of content of the message is not clear. Actual examples of this messaging: * When clock source is set as internal: - 0x00007051 - 0x00007052 - 0x00007054 - 0x00007057 - 0x00007058 * When clock source is set as somewhat external: - 0x00009000 - 0x00009010 - 0x00009020 - 0x00009021 - 0x00009022 The lost often occurs when using internal clock source. In this case, users hear sounds with quite short gap every several minutes. In fact, the lost is recovered temporarily. When using with external clock source, the lost seems not to occur. The mechanism is not clear yet.
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| @@ -9,6 +9,7 @@ · 8 unmodified lines | |||
| 9 | #define SNDRV_FIREWIRE_EVENT_LOCK_STATUS 0x000010cc | 9 | #define SNDRV_FIREWIRE_EVENT_LOCK_STATUS 0x000010cc |
| 10 | #define SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION 0xd1ce004e | 10 | #define SNDRV_FIREWIRE_EVENT_DICE_NOTIFICATION 0xd1ce004e |
| 11 | #define SNDRV_FIREWIRE_EVENT_EFW_RESPONSE 0x4e617475 | 11 | #define SNDRV_FIREWIRE_EVENT_EFW_RESPONSE 0x4e617475 |
| 12 | #define SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE 0x746e736c | ||
| 12 | 13 | ||
| 13 | struct snd_firewire_event_common { | 14 | struct snd_firewire_event_common { |
| 14 | unsigned int type; /* SNDRV_FIREWIRE_EVENT_xxx */ | 15 | unsigned int type; /* SNDRV_FIREWIRE_EVENT_xxx */ |
| @@ -40,11 +41,17 @@ struct snd_firewire_event_efw_response { · 25 unmodified lines | |||
| 40 | __be32 response[0]; /* some responses */ | 41 | __be32 response[0]; /* some responses */ |
| 41 | }; | 42 | }; |
| 42 | 43 | ||
| 44 | struct snd_firewire_event_digi00x_message { | ||
| 45 | unsigned int type; | ||
| 46 | __u32 message; /* Digi00x-specific message */ | ||
| 47 | }; | ||
| 48 | |||
| 43 | union snd_firewire_event { | 49 | union snd_firewire_event { |
| 44 | struct snd_firewire_event_common common; | 50 | struct snd_firewire_event_common common; |
| 45 | struct snd_firewire_event_lock_status lock_status; | 51 | struct snd_firewire_event_lock_status lock_status; |
| 46 | struct snd_firewire_event_dice_notification dice_notification; | 52 | struct snd_firewire_event_dice_notification dice_notification; |
| 47 | struct snd_firewire_event_efw_response efw_response; | 53 | struct snd_firewire_event_efw_response efw_response; |
| 54 | struct snd_firewire_event_digi00x_message digi00x_message; | ||
| 48 | }; | 55 | }; |
| 49 | 56 | ||
| 50 | 57 | ||