On Wed, Jun 06, 2007 at 01:29:34PM -0700, Andrew Morton wrote:
> > asmlinkage long sys_time_pps_find(int cmd, int __user *source,
> > char __user *name, int namelen,
> > char __user *path, int pathlen);
Try to find a PPS source into the system giving one of its feature.
With cmd==PPS_FIND_SRC we check for a PPS source with index number
equal to *source, if *source==-1 we just ask for the first PPS source
defined into the system.
With cmd=PPS_FIND_PATH we check for a PPS source with path name equal
to path.
Selected source is returned into *source and PPS source info are
placed into path and name arrays.
> > asmlinkage long sys_time_pps_getparams(int source,
> > struct pps_params __user *params);
struct pps_params {
int api_version; /* API version # */
int mode; /* mode bits */
union pps_timeu assert_off_tu; /* offset compensation for assert */
union pps_timeu clear_off_tu; /* offset compensation for clear */
};
Given a PPS source index returns its parameters setting.
> > asmlinkage long sys_time_pps_setparams(int source,
> > const struct pps_params __user *params);
Sets PPS source parameters.
> > asmlinkage long sys_time_pps_getcap(int source, int __user *mode);
Given a PPS source index returns its functioning modes.
> > asmlinkage long sys_time_pps_fetch(int source, const int tsformat,
> > struct pps_info __user *info,
> > const struct timespec __user *timeout);
struct pps_info {
unsigned long assert_sequence; /* seq. num. of assert event */
unsigned long clear_sequence; /* seq. num. of clear event */
union pps_timeu assert_tu; /* time of assert event */
union pps_timeu clear_tu; /* time of clear event */
int current_mode; /* current mode bits */
};
Given a PPS source index, a time format and, optionally, a timeout
time returns PPS time data.
Further info on these structs can be get on RFC 2783.
Apart sys_time_pps_find() the other syscalls derive directly from RFC
2783 suggestions.
I hope these info are enough... :)
Rodolfo
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