Add code to open and close PHC devices.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>master
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#
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# Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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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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KBUILD_OUTPUT ?= /lib/modules/$(shell uname -r)/build
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DEBUG =
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CC = gcc
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INC = -I$(KBUILD_OUTPUT)/usr/include
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CFLAGS = -Wall $(INC) $(DEBUG)
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LDFLAGS =
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LDLIBS = -lm -lrt
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PRG = linuxptp
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OBJ = phc.o
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SRC = $(OBJ:.o=.c)
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DEPEND = $(OBJ:.o=.d)
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srcdir := $(dir $(lastword $(MAKEFILE_LIST)))
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VPATH = $(srcdir)
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all: $(OBJ)
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linuxptp: $(OBJ)
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clean:
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rm -f $(OBJ) $(DEPEND)
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distclean: clean
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rm -f $(PRG)
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# Implicit rule to generate a C source file's dependencies.
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%.d: %.c
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@echo DEPEND $<; \
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rm -f $@; \
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$(CC) -MM $(CPPFLAGS) $(CFLAGS) $< > $@.$$$$; \
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sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
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rm -f $@.$$$$
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-include $(DEPEND)
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/**
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* @file phc.c
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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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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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "phc.h"
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clockid_t phc_open(char *phc)
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{
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int fd = open(phc, O_RDWR);
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return fd < 0 ? CLOCK_INVALID : FD_TO_CLOCKID(fd);
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}
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void phc_close(clockid_t clkid)
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{
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if (clkid == CLOCK_INVALID)
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return;
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close(CLOCKID_TO_FD(clkid));
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}
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/**
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* @file phc.h
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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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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*/
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#ifndef HAVE_PHC_H
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#define HAVE_PHC_H
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#include "missing.h"
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/**
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* Opens a PTP hardware clock device.
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*
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* @param phc The device to open.
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*
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* @return A valid clock ID on success, CLOCK_INVALID otherwise.
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*/
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clockid_t phc_open(char *phc);
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/**
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* Closes 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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void phc_close(clockid_t clkid);
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#endif
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