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firewire: implement asynchronous stream transmission

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Allow userspace and other firewire drivers (fw-ipv4 I'm looking at
you!) to send Asynchronous Transmit Streams as described in 7.8.3 of
release 1.1 of the 1394 Open Host Controller Interface Specification.

Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (tweaks)
This commit is contained in:
Jay Fenlason 2009-03-05 19:08:40 +01:00 • committed by Stefan Richter
parent ba27e1f7bf
commit f8c2287c65
5 changed files with 108 additions and 2 deletions
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27
include/linux/firewire-cdev.h
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@ -246,6 +246,7 @@ union fw_cdev_event {
#define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
#define FW_CDEV_IOC_GET_SPEED _IOR('#', 0x11, struct fw_cdev_get_speed)
#define FW_CDEV_IOC_SEND_BROADCAST_REQUEST _IOW('#', 0x12, struct fw_cdev_send_request)
#define FW_CDEV_IOC_SEND_STREAM_PACKET _IOW('#', 0x13, struct fw_cdev_send_stream_packet)
/*
* FW_CDEV_VERSION History
@ -609,4 +610,30 @@ struct fw_cdev_get_speed {
__u32 max_speed;
};
/**
* struct fw_cdev_send_stream_packet - send an asynchronous stream packet
* @generation: Bus generation where the packet is valid
* @speed: Speed code to send the packet at
* @channel: Channel to send the packet on
* @sy: Four-bit sy code for the packet
* @tag: Two-bit tag field to use for the packet
* @size: Size of the packet's data payload
* @data: Userspace pointer to the payload
*
* The %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl sends an asynchronous stream packet
* to every device (that is listening to the specified channel) on the
* firewire bus. It is the applications's job to ensure
* that the intended device(s) will be able to receive the packet at the chosen
* transmit speed.
*/
struct fw_cdev_send_stream_packet {
__u32 generation;
__u32 speed;
__u32 channel;
__u32 sy;
__u32 tag;
__u32 size;
__u64 data;
};
#endif /* _LINUX_FIREWIRE_CDEV_H */