diff options
| -rw-r--r-- | include/linux/firewire-cdev.h | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h index 52c7ffe934a..8b9b2737321 100644 --- a/include/linux/firewire-cdev.h +++ b/include/linux/firewire-cdev.h @@ -204,10 +204,21 @@ struct fw_cdev_event_request2 { * @header: Stripped headers, if any * * This event is sent when the controller has completed an &fw_cdev_iso_packet - * with the %FW_CDEV_ISO_INTERRUPT bit set. In the receive case, the headers - * stripped of all packets up until and including the interrupt packet are - * returned in the @header field. The amount of header data per packet is as - * specified at iso context creation by &fw_cdev_create_iso_context.header_size. + * with the %FW_CDEV_ISO_INTERRUPT bit set. + * + * Isochronous transmit events: + * + * In version 1 of the ABI, &header_length is 0. In version 3 and some + * implementations of version 2 of the ABI, &header_length is a multiple of 4 + * and &header contains timestamps of all packets up until the interrupt packet. + * The format of the timestamps is as described below for isochronous reception. + * + * Isochronous receive events: + * + * The headers stripped of all packets up until and including the interrupt + * packet are returned in the @header field. The amount of header data per + * packet is as specified at iso context creation by + * &fw_cdev_create_iso_context.header_size. * * In version 1 of this ABI, header data consisted of the 1394 isochronous * packet header, followed by quadlets from the packet payload if |