Add code to open and close PHC devices.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2011-11-01 18:00:16 +01:00
parent af380e8617
commit 11e0446c0e
3 changed files with 132 additions and 0 deletions

53
makefile 100644
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#
# Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
KBUILD_OUTPUT ?= /lib/modules/$(shell uname -r)/build
DEBUG =
CC = gcc
INC = -I$(KBUILD_OUTPUT)/usr/include
CFLAGS = -Wall $(INC) $(DEBUG)
LDFLAGS =
LDLIBS = -lm -lrt
PRG = linuxptp
OBJ = phc.o
SRC = $(OBJ:.o=.c)
DEPEND = $(OBJ:.o=.d)
srcdir := $(dir $(lastword $(MAKEFILE_LIST)))
VPATH = $(srcdir)
all: $(OBJ)
linuxptp: $(OBJ)
clean:
rm -f $(OBJ) $(DEPEND)
distclean: clean
rm -f $(PRG)
# Implicit rule to generate a C source file's dependencies.
%.d: %.c
@echo DEPEND $<; \
rm -f $@; \
$(CC) -MM $(CPPFLAGS) $(CFLAGS) $< > $@.$$$$; \
sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
rm -f $@.$$$$
-include $(DEPEND)

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phc.c 100644
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/**
* @file phc.c
* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "phc.h"
clockid_t phc_open(char *phc)
{
int fd = open(phc, O_RDWR);
return fd < 0 ? CLOCK_INVALID : FD_TO_CLOCKID(fd);
}
void phc_close(clockid_t clkid)
{
if (clkid == CLOCK_INVALID)
return;
close(CLOCKID_TO_FD(clkid));
}

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phc.h 100644
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/**
* @file phc.h
* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef HAVE_PHC_H
#define HAVE_PHC_H
#include "missing.h"
/**
* Opens a PTP hardware clock device.
*
* @param phc The device to open.
*
* @return A valid clock ID on success, CLOCK_INVALID otherwise.
*/
clockid_t phc_open(char *phc);
/**
* Closes a PTP hardware clock device.
*
* @param clkid A clock ID obtained using phc_open().
*/
void phc_close(clockid_t clkid);
#endif