From 3dc5ea9b31a8c83cffa338aba91adbc9bd387002 Mon Sep 17 00:00:00 2001 From: Pieter Palmers Date: Sat, 3 Feb 2007 17:44:39 +0100 Subject: 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 Acked-by: Pieter Palmers Acked-by: Dan Dennedy --- drivers/ieee1394/ieee1394_core.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/ieee1394/ieee1394_core.h') diff --git a/drivers/ieee1394/ieee1394_core.h b/drivers/ieee1394/ieee1394_core.h index 536ba3f580f..bd29d8ef5bb 100644 --- a/drivers/ieee1394/ieee1394_core.h +++ b/drivers/ieee1394/ieee1394_core.h @@ -127,6 +127,9 @@ int hpsb_send_packet_and_wait(struct hpsb_packet *packet); * progress, 0 otherwise. */ int hpsb_reset_bus(struct hpsb_host *host, int type); +int hpsb_read_cycle_timer(struct hpsb_host *host, u32 *cycle_timer, + u64 *local_time); + /* * The following functions are exported for host driver module usage. All of * them are safe to use in interrupt contexts, although some are quite -- cgit v1.2.3