phc: Add a method to query the maximum adjustment.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>master
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150897669e
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5b8fa684ae
17
phc.c
17
phc.c
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@ -16,11 +16,15 @@
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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*/
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <linux/ptp_clock.h>
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#include "phc.h"
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#include "phc.h"
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clockid_t phc_open(char *phc)
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clockid_t phc_open(char *phc)
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@ -37,3 +41,16 @@ void phc_close(clockid_t clkid)
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close(CLOCKID_TO_FD(clkid));
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close(CLOCKID_TO_FD(clkid));
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}
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}
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int phc_max_adj(clockid_t clkid)
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{
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int fd = CLOCKID_TO_FD(clkid);
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struct ptp_clock_caps caps;
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if (ioctl(fd, PTP_CLOCK_GETCAPS, &caps)) {
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perror("PTP_CLOCK_GETCAPS");
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return 0;
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}
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return caps.max_adj;
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}
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9
phc.h
9
phc.h
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@ -37,4 +37,13 @@ clockid_t phc_open(char *phc);
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*/
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*/
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void phc_close(clockid_t clkid);
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void phc_close(clockid_t clkid);
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/**
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* Query the maximum frequency adjustment of a PTP hardware clock device.
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*
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* @param clkid A clock ID obtained using phc_open().
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*
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* @return The clock's maximum frequency adjustment in parts per billion.
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*/
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int phc_max_adj(clockid_t clkid);
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#endif
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#endif
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