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samples/timers/hpet_example.c
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// SPDX-License-Identifier: GPL-2.0 |
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#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <memory.h> #include <malloc.h> #include <time.h> #include <ctype.h> #include <sys/types.h> #include <sys/wait.h> #include <signal.h> |
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#include <errno.h> #include <sys/time.h> #include <linux/hpet.h> extern void hpet_open_close(int, const char **); extern void hpet_info(int, const char **); extern void hpet_poll(int, const char **); extern void hpet_fasync(int, const char **); extern void hpet_read(int, const char **); #include <sys/poll.h> #include <sys/ioctl.h> |
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struct hpet_command {
char *command;
void (*func)(int argc, const char ** argv);
} hpet_command[] = {
{
"open-close",
hpet_open_close
},
{
"info",
hpet_info
},
{
"poll",
hpet_poll
},
{
"fasync",
hpet_fasync
},
};
int
main(int argc, const char ** argv)
{
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unsigned int i; |
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argc--;
argv++;
if (!argc) {
fprintf(stderr, "-hpet: requires command
");
return -1;
}
for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++)
if (!strcmp(argv[0], hpet_command[i].command)) {
argc--;
argv++;
fprintf(stderr, "-hpet: executing %s
",
hpet_command[i].command);
hpet_command[i].func(argc, argv);
return 0;
}
fprintf(stderr, "do_hpet: command %s not implemented
", argv[0]);
return -1;
}
void
hpet_open_close(int argc, const char **argv)
{
int fd;
if (argc != 1) {
fprintf(stderr, "hpet_open_close: device-name
");
return;
}
fd = open(argv[0], O_RDONLY);
if (fd < 0)
fprintf(stderr, "hpet_open_close: open failed
");
else
close(fd);
return;
}
void
hpet_info(int argc, const char **argv)
{
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struct hpet_info info;
int fd;
if (argc != 1) {
fprintf(stderr, "hpet_info: device-name
");
return;
}
fd = open(argv[0], O_RDONLY);
if (fd < 0) {
fprintf(stderr, "hpet_info: open of %s failed
", argv[0]);
return;
}
if (ioctl(fd, HPET_INFO, &info) < 0) {
fprintf(stderr, "hpet_info: failed to get info
");
goto out;
}
fprintf(stderr, "hpet_info: hi_irqfreq 0x%lx hi_flags 0x%lx ",
info.hi_ireqfreq, info.hi_flags);
fprintf(stderr, "hi_hpet %d hi_timer %d
",
info.hi_hpet, info.hi_timer);
out:
close(fd);
return;
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}
void
hpet_poll(int argc, const char **argv)
{
unsigned long freq;
int iterations, i, fd;
struct pollfd pfd;
struct hpet_info info;
struct timeval stv, etv;
struct timezone tz;
long usec;
if (argc != 3) {
fprintf(stderr, "hpet_poll: device-name freq iterations
");
return;
}
freq = atoi(argv[1]);
iterations = atoi(argv[2]);
fd = open(argv[0], O_RDONLY);
if (fd < 0) {
fprintf(stderr, "hpet_poll: open of %s failed
", argv[0]);
return;
}
if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed
");
goto out;
}
if (ioctl(fd, HPET_INFO, &info) < 0) {
fprintf(stderr, "hpet_poll: failed to get info
");
goto out;
}
fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx
", info.hi_flags);
if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
fprintf(stderr, "hpet_poll: HPET_EPI failed
");
goto out;
}
if (ioctl(fd, HPET_IE_ON, 0) < 0) {
fprintf(stderr, "hpet_poll, HPET_IE_ON failed
");
goto out;
}
pfd.fd = fd;
pfd.events = POLLIN;
for (i = 0; i < iterations; i++) {
pfd.revents = 0;
gettimeofday(&stv, &tz);
if (poll(&pfd, 1, -1) < 0)
fprintf(stderr, "hpet_poll: poll failed
");
else {
long data;
gettimeofday(&etv, &tz);
usec = stv.tv_sec * 1000000 + stv.tv_usec;
usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec;
fprintf(stderr,
"hpet_poll: expired time = 0x%lx
", usec);
fprintf(stderr, "hpet_poll: revents = 0x%x
",
pfd.revents);
if (read(fd, &data, sizeof(data)) != sizeof(data)) {
fprintf(stderr, "hpet_poll: read failed
");
}
else
fprintf(stderr, "hpet_poll: data 0x%lx
",
data);
}
}
out:
close(fd);
return;
}
static int hpet_sigio_count;
static void
hpet_sigio(int val)
{
fprintf(stderr, "hpet_sigio: called
");
hpet_sigio_count++;
}
void
hpet_fasync(int argc, const char **argv)
{
unsigned long freq;
int iterations, i, fd, value;
sig_t oldsig;
struct hpet_info info;
hpet_sigio_count = 0;
fd = -1;
if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) {
fprintf(stderr, "hpet_fasync: failed to set signal handler
");
return;
}
if (argc != 3) {
fprintf(stderr, "hpet_fasync: device-name freq iterations
");
goto out;
}
fd = open(argv[0], O_RDONLY);
if (fd < 0) {
fprintf(stderr, "hpet_fasync: failed to open %s
", argv[0]);
return;
}
if ((fcntl(fd, F_SETOWN, getpid()) == 1) ||
((value = fcntl(fd, F_GETFL)) == 1) ||
(fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) {
fprintf(stderr, "hpet_fasync: fcntl failed
");
goto out;
}
freq = atoi(argv[1]);
iterations = atoi(argv[2]);
if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed
");
goto out;
}
if (ioctl(fd, HPET_INFO, &info) < 0) {
fprintf(stderr, "hpet_fasync: failed to get info
");
goto out;
}
fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx
", info.hi_flags);
if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
fprintf(stderr, "hpet_fasync: HPET_EPI failed
");
goto out;
}
if (ioctl(fd, HPET_IE_ON, 0) < 0) {
fprintf(stderr, "hpet_fasync, HPET_IE_ON failed
");
goto out;
}
for (i = 0; i < iterations; i++) {
(void) pause();
fprintf(stderr, "hpet_fasync: count = %d
", hpet_sigio_count);
}
out:
signal(SIGIO, oldsig);
if (fd >= 0)
close(fd);
return;
}
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