diff options
Diffstat (limited to 'include/linux/firewire-cdev.h')
| -rw-r--r-- | include/linux/firewire-cdev.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/firewire-cdev.h b/include/linux/firewire-cdev.h index 1a45d6f41b0..0f0e271f97f 100644 --- a/include/linux/firewire-cdev.h +++ b/include/linux/firewire-cdev.h @@ -178,6 +178,7 @@ union fw_cdev_event { #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 @@ struct fw_cdev_stop_iso { __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 */ |