Documentation/timers/hpet_example.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <fcntl.h>
   5 #include <string.h>
   6 #include <memory.h>
   7 #include <malloc.h>
   8 #include <time.h>
   9 #include <ctype.h>
  10 #include <sys/types.h>
  11 #include <sys/wait.h>
  12 #include <signal.h>
  13 #include <errno.h>
  14 #include <sys/time.h>
  15 #include <linux/hpet.h>
  16
  17
  18 extern void hpet_open_close(int, const char **);
  19 extern void hpet_info(int, const char **);
  20 extern void hpet_poll(int, const char **);
  21 extern void hpet_fasync(int, const char **);
  22 extern void hpet_read(int, const char **);
  23
  24 #include <sys/poll.h>
  25 #include <sys/ioctl.h>
  26
  27 struct hpet_command {
  28         char            *command;
  29         void            (*func)(int argc, const char ** argv);
  30 } hpet_command[] = {
  31         {
  32                 "open-close",
  33                 hpet_open_close
  34         },
  35         {
  36                 "info",
  37                 hpet_info
  38         },
  39         {
  40                 "poll",
  41                 hpet_poll
  42         },
  43         {
  44                 "fasync",
  45                 hpet_fasync
  46         },
  47 };
  48
  49 int
  50 main(int argc, const char ** argv)
  51 {
  52         int     i;
  53
  54         argc--;
  55         argv++;
  56
  57         if (!argc) {
  58                 fprintf(stderr, "-hpet: requires command\n");
  59                 return -1;
  60         }
  61
  62
  63         for (i = 0; i < (sizeof (hpet_command) / sizeof (hpet_command[0])); i++)
  64                 if (!strcmp(argv[0], hpet_command[i].command)) {
  65                         argc--;
  66                         argv++;
  67                         fprintf(stderr, "-hpet: executing %s\n",
  68                                 hpet_command[i].command);
  69                         hpet_command[i].func(argc, argv);
  70                         return 0;
  71                 }
  72
  73         fprintf(stderr, "do_hpet: command %s not implemented\n", argv[0]);
  74
  75         return -1;
  76 }
  77
  78 void
  79 hpet_open_close(int argc, const char **argv)
  80 {
  81         int     fd;
  82
  83         if (argc != 1) {
  84                 fprintf(stderr, "hpet_open_close: device-name\n");
  85                 return;
  86         }
  87
  88         fd = open(argv[0], O_RDONLY);
  89         if (fd < 0)
  90                 fprintf(stderr, "hpet_open_close: open failed\n");
  91         else
  92                 close(fd);
  93
  94         return;
  95 }
  96
  97 void
  98 hpet_info(int argc, const char **argv)
  99 {
 100         struct hpet_info        info;
 101         int                     fd;
 102
 103         if (argc != 1) {
 104                 fprintf(stderr, "hpet_info: device-name\n");
 105                 return;
 106         }
 107
 108         fd = open(argv[0], O_RDONLY);
 109         if (fd < 0) {
 110                 fprintf(stderr, "hpet_info: open of %s failed\n", argv[0]);
 111                 return;
 112         }
 113
 114         if (ioctl(fd, HPET_INFO, &info) < 0) {
 115                 fprintf(stderr, "hpet_info: failed to get info\n");
 116                 goto out;
 117         }
 118
 119         fprintf(stderr, "hpet_info: hi_irqfreq 0x%lx hi_flags 0x%lx ",
 120                 info.hi_ireqfreq, info.hi_flags);
 121         fprintf(stderr, "hi_hpet %d hi_timer %d\n",
 122                 info.hi_hpet, info.hi_timer);
 123
 124 out:
 125         close(fd);
 126         return;
 127 }
 128
 129 void
 130 hpet_poll(int argc, const char **argv)
 131 {
 132         unsigned long           freq;
 133         int                     iterations, i, fd;
 134         struct pollfd           pfd;
 135         struct hpet_info        info;
 136         struct timeval          stv, etv;
 137         struct timezone         tz;
 138         long                    usec;
 139
 140         if (argc != 3) {
 141                 fprintf(stderr, "hpet_poll: device-name freq iterations\n");
 142                 return;
 143         }
 144
 145         freq = atoi(argv[1]);
 146         iterations = atoi(argv[2]);
 147
 148         fd = open(argv[0], O_RDONLY);
 149
 150         if (fd < 0) {
 151                 fprintf(stderr, "hpet_poll: open of %s failed\n", argv[0]);
 152                 return;
 153         }
 154
 155         if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
 156                 fprintf(stderr, "hpet_poll: HPET_IRQFREQ failed\n");
 157                 goto out;
 158         }
 159
 160         if (ioctl(fd, HPET_INFO, &info) < 0) {
 161                 fprintf(stderr, "hpet_poll: failed to get info\n");
 162                 goto out;
 163         }
 164
 165         fprintf(stderr, "hpet_poll: info.hi_flags 0x%lx\n", info.hi_flags);
 166
 167         if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
 168                 fprintf(stderr, "hpet_poll: HPET_EPI failed\n");
 169                 goto out;
 170         }
 171
 172         if (ioctl(fd, HPET_IE_ON, 0) < 0) {
 173                 fprintf(stderr, "hpet_poll, HPET_IE_ON failed\n");
 174                 goto out;
 175         }
 176
 177         pfd.fd = fd;
 178         pfd.events = POLLIN;
 179
 180         for (i = 0; i < iterations; i++) {
 181                 pfd.revents = 0;
 182                 gettimeofday(&stv, &tz);
 183                 if (poll(&pfd, 1, -1) < 0)
 184                         fprintf(stderr, "hpet_poll: poll failed\n");
 185                 else {
 186                         long    data;
 187
 188                         gettimeofday(&etv, &tz);
 189                         usec = stv.tv_sec * 1000000 + stv.tv_usec;
 190                         usec = (etv.tv_sec * 1000000 + etv.tv_usec) - usec;
 191
 192                         fprintf(stderr,
 193                                 "hpet_poll: expired time = 0x%lx\n", usec);
 194
 195                         fprintf(stderr, "hpet_poll: revents = 0x%x\n",
 196                                 pfd.revents);
 197
 198                         if (read(fd, &data, sizeof(data)) != sizeof(data)) {
 199                                 fprintf(stderr, "hpet_poll: read failed\n");
 200                         }
 201                         else
 202                                 fprintf(stderr, "hpet_poll: data 0x%lx\n",
 203                                         data);
 204                 }
 205         }
 206
 207 out:
 208         close(fd);
 209         return;
 210 }
 211
 212 static int hpet_sigio_count;
 213
 214 static void
 215 hpet_sigio(int val)
 216 {
 217         fprintf(stderr, "hpet_sigio: called\n");
 218         hpet_sigio_count++;
 219 }
 220
 221 void
 222 hpet_fasync(int argc, const char **argv)
 223 {
 224         unsigned long           freq;
 225         int                     iterations, i, fd, value;
 226         sig_t                   oldsig;
 227         struct hpet_info        info;
 228
 229         hpet_sigio_count = 0;
 230         fd = -1;
 231
 232         if ((oldsig = signal(SIGIO, hpet_sigio)) == SIG_ERR) {
 233                 fprintf(stderr, "hpet_fasync: failed to set signal handler\n");
 234                 return;
 235         }
 236
 237         if (argc != 3) {
 238                 fprintf(stderr, "hpet_fasync: device-name freq iterations\n");
 239                 goto out;
 240         }
 241
 242         fd = open(argv[0], O_RDONLY);
 243
 244         if (fd < 0) {
 245                 fprintf(stderr, "hpet_fasync: failed to open %s\n", argv[0]);
 246                 return;
 247         }
 248
 249
 250         if ((fcntl(fd, F_SETOWN, getpid()) == 1) ||
 251                 ((value = fcntl(fd, F_GETFL)) == 1) ||
 252                 (fcntl(fd, F_SETFL, value | O_ASYNC) == 1)) {
 253                 fprintf(stderr, "hpet_fasync: fcntl failed\n");
 254                 goto out;
 255         }
 256
 257         freq = atoi(argv[1]);
 258         iterations = atoi(argv[2]);
 259
 260         if (ioctl(fd, HPET_IRQFREQ, freq) < 0) {
 261                 fprintf(stderr, "hpet_fasync: HPET_IRQFREQ failed\n");
 262                 goto out;
 263         }
 264
 265         if (ioctl(fd, HPET_INFO, &info) < 0) {
 266                 fprintf(stderr, "hpet_fasync: failed to get info\n");
 267                 goto out;
 268         }
 269
 270         fprintf(stderr, "hpet_fasync: info.hi_flags 0x%lx\n", info.hi_flags);
 271
 272         if (info.hi_flags && (ioctl(fd, HPET_EPI, 0) < 0)) {
 273                 fprintf(stderr, "hpet_fasync: HPET_EPI failed\n");
 274                 goto out;
 275         }
 276
 277         if (ioctl(fd, HPET_IE_ON, 0) < 0) {
 278                 fprintf(stderr, "hpet_fasync, HPET_IE_ON failed\n");
 279                 goto out;
 280         }
 281
 282         for (i = 0; i < iterations; i++) {
 283                 (void) pause();
 284                 fprintf(stderr, "hpet_fasync: count = %d\n", hpet_sigio_count);
 285         }
 286
 287 out:
 288         signal(SIGIO, oldsig);
 289
 290         if (fd >= 0)
 291                 close(fd);
 292
 293         return;
 294 }