diff options
| author | Pieter Palmers <pieterp@joow.be> | 2007-02-03 17:44:39 +0100 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-02-17 14:39:33 +0100 |
| commit | 3dc5ea9b31a8c83cffa338aba91adbc9bd387002 (patch) | |
| tree | 5a9d9682d77fb3a1cfd3dc27654301f69ababf12 /drivers/ieee1394/ieee1394-ioctl.h | |
| parent | 91efa462054d44ae52b0c6c8325ed5e899f2cd17 (diff) | |
ieee1394: cycle timer read extension for raw1394
This implements the simultaneous read of the isochronous cycle timer and
the system clock (in usecs). This allows to express the exact receive
time of an ISO packet as a system time with microsecond accuracy.
http://bugzilla.kernel.org/show_bug.cgi?id=7773
The counterpart patch for libraw1394 can be found at
http://thread.gmane.org/gmane.linux.kernel.firewire.devel/8934
Patch update (Stefan R.): Disable preemption and local interrupts.
Prevent integer overflow. Add paranoid error checks and kerneldoc to
hpsb_read_cycle_timer. Move it to other ieee1394_core high-level API
functions. Change comments. Adjust whitespace. Rename struct
_raw1394_cycle_timer.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Pieter Palmers <pieterp@joow.be>
Acked-by: Dan Dennedy <dan@dennedy.org>
Diffstat (limited to 'drivers/ieee1394/ieee1394-ioctl.h')
| -rw-r--r-- | drivers/ieee1394/ieee1394-ioctl.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/ieee1394/ieee1394-ioctl.h b/drivers/ieee1394/ieee1394-ioctl.h index 8f207508ed1d..46878fef136c 100644 --- a/drivers/ieee1394/ieee1394-ioctl.h +++ b/drivers/ieee1394/ieee1394-ioctl.h @@ -100,5 +100,7 @@ _IO ('#', 0x28) #define RAW1394_IOC_ISO_RECV_FLUSH \ _IO ('#', 0x29) +#define RAW1394_IOC_GET_CYCLE_TIMER \ + _IOR ('#', 0x30, struct raw1394_cycle_timer) #endif /* __IEEE1394_IOCTL_H */ |