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yaml
---
r: 187196
b: refs/heads/master
c: e618630
h: refs/heads/master
v: v3
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Randy Dunlap authored and Linus Torvalds committed Mar 12, 2010
1 parent 11d79b5 commit 2b30c7a
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Showing 6 changed files with 283 additions and 273 deletions.
2 changes: 1 addition & 1 deletion [refs]
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---
refs/heads/master: ad25ad979a309963e580015d57e4ec7da72bb7d4
refs/heads/master: e61863099f58e458f08c101da87da752a1e009f5
2 changes: 1 addition & 1 deletion trunk/Documentation/Makefile
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@@ -1,3 +1,3 @@
obj-m := DocBook/ accounting/ auxdisplay/ connector/ \
filesystems/configfs/ ia64/ networking/ \
pcmcia/ spi/ video4linux/ vm/ watchdog/src/
pcmcia/ spi/ timers/ video4linux/ vm/ watchdog/src/
2 changes: 2 additions & 0 deletions trunk/Documentation/timers/00-INDEX
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Expand Up @@ -4,6 +4,8 @@ highres.txt
- High resolution timers and dynamic ticks design notes
hpet.txt
- High Precision Event Timer Driver for Linux
hpet_example.c
- sample hpet timer test program
hrtimers.txt
- subsystem for high-resolution kernel timers
timer_stats.txt
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8 changes: 8 additions & 0 deletions trunk/Documentation/timers/Makefile
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# kbuild trick to avoid linker error. Can be omitted if a module is built.
obj- := dummy.o

# List of programs to build
hostprogs-y := hpet_example

# Tell kbuild to always build the programs
always := $(hostprogs-y)
273 changes: 2 additions & 271 deletions trunk/Documentation/timers/hpet.txt
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Expand Up @@ -26,274 +26,5 @@ initialization. An example of this initialization can be found in
arch/x86/kernel/hpet.c.

The driver provides a userspace API which resembles the API found in the
RTC driver framework. An example user space program is provided below.

#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>
#include <fcntl.h>
#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>
#include <signal.h>

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)
{
int i;

argc--;
argv++;

if (!argc) {
fprintf(stderr, "-hpet: requires command\n");
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\n",
hpet_command[i].command);
hpet_command[i].func(argc, argv);
return 0;
}

fprintf(stderr, "do_hpet: command %s not implemented\n", 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\n");
return;
}

fd = open(argv[0], O_RDONLY);
if (fd < 0)
fprintf(stderr, "hpet_open_close: open failed\n");
else
close(fd);

return;
}

void
hpet_info(int argc, const char **argv)
{
}

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\n");
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\n", argv[0]);
return;
}

if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n");
goto out;
}

if (ioctl(fd, HPET_INFO, &info) < 0) {
fprintf(stderr, "hpet_poll: failed to get info\n");
goto out;
}

fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags);

if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
fprintf(stderr, "hpet_poll: HPET_EPI failed\n");
goto out;
}

if (ioctl(fd, HPET_IE_ON, 0) < 0) {
fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n");
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\n");
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\n", usec);

fprintf(stderr, "hpet_poll: revents = 0x%x\n",
pfd.revents);

if (read(fd, &data, sizeof(data)) != sizeof(data)) {
fprintf(stderr, "hpet_poll: read failed\n");
}
else
fprintf(stderr, "hpet_poll: data 0x%lx\n",
data);
}
}

out:
close(fd);
return;
}

static int hpet_sigio_count;

static void
hpet_sigio(int val)
{
fprintf(stderr, "hpet_sigio: called\n");
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\n");
return;
}

if (argc != 3) {
fprintf(stderr, "hpet_fasync: device-name freq iterations\n");
goto out;
}

fd = open(argv[0], O_RDONLY);

if (fd < 0) {
fprintf(stderr, "hpet_fasync: failed to open %s\n", 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\n");
goto out;
}

freq = atoi(argv[1]);
iterations = atoi(argv[2]);

if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n");
goto out;
}

if (ioctl(fd, HPET_INFO, &info) < 0) {
fprintf(stderr, "hpet_fasync: failed to get info\n");
goto out;
}

fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags);

if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
fprintf(stderr, "hpet_fasync: HPET_EPI failed\n");
goto out;
}

if (ioctl(fd, HPET_IE_ON, 0) < 0) {
fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n");
goto out;
}

for (i = 0; i < iterations; i++) {
(void) pause();
fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count);
}

out:
signal(SIGIO, oldsig);

if (fd >= 0)
close(fd);

return;
}
RTC driver framework. An example user space program is provided in
file:Documentation/timers/hpet_example.c
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