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)
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 2e35379b..4dfc84d 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -246,6 +246,7 @@
#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 @@
__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 */