firewire: adopt read cycle timer ABI from raw1394
This duplicates the read cycle timer feature of raw1394 (added in Linux
2.6.21) in firewire-core's userspace ABI. The argument to the ioctl is
reordered though to ensure 32/64 bit compatibility.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h
index 1a45d6f..0f0e271 100644
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -178,6 +178,7 @@
#define FW_CDEV_IOC_QUEUE_ISO _IOWR('#', 0x09, struct fw_cdev_queue_iso)
#define FW_CDEV_IOC_START_ISO _IOW('#', 0x0a, struct fw_cdev_start_iso)
#define FW_CDEV_IOC_STOP_ISO _IOW('#', 0x0b, struct fw_cdev_stop_iso)
+#define FW_CDEV_IOC_GET_CYCLE_TIMER _IOR('#', 0x0c, struct fw_cdev_get_cycle_timer)
/* FW_CDEV_VERSION History
*
@@ -459,4 +460,18 @@
__u32 handle;
};
+/**
+ * struct fw_cdev_get_cycle_timer - read cycle timer register
+ * @local_time: system time, in microseconds since the Epoch
+ * @cycle_timer: isochronous cycle timer, as per OHCI 1.1 clause 5.13
+ *
+ * The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
+ * and also the system clock. This allows to express the receive time of an
+ * isochronous packet as a system time with microsecond accuracy.
+ */
+struct fw_cdev_get_cycle_timer {
+ __u64 local_time;
+ __u32 cycle_timer;
+};
+
#endif /* _LINUX_FIREWIRE_CDEV_H */