firewire: implement asynchronous stream transmission

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)

1 files changed, 27 insertions, 0 deletions

diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 2e35379bf96c..4dfc84d0ac76 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -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 */