components/battery.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdio.h>
   3 #if defined(__linux__)
   4 #include <limits.h>
   5 #include <string.h>
   6 #elif defined(__OpenBSD__)
   7 #include <sys/ioctl.h>
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10 #include <machine/apmvar.h>
  11 #endif
  12
  13 #include "../util.h"
  14
  15 const char *
  16 battery_perc(const char *bat)
  17 {
  18 #if defined(__linux__)
  19         int perc;
  20         char path[PATH_MAX];
  21
  22         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
  23         return (pscanf(path, "%i", &perc) == 1) ?
  24                bprintf("%d", perc) : NULL;
  25 #elif defined(__OpenBSD__)
  26         struct apm_power_info apm_info;
  27         int fd;
  28
  29         fd = open("/dev/apm", O_RDONLY);
  30         if (fd < 0) {
  31                 fprintf(stderr, "Failed to open file /dev/apm");
  32                 return NULL;
  33         }
  34
  35         if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
  36                 fprintf(stderr, "Failed to get battery info");
  37                 close(fd);
  38                 return NULL;
  39         }
  40         close(fd);
  41
  42         return bprintf("%d", apm_info.battery_life);
  43 #endif
  44 }
  45
  46 #if defined(__linux__)
  47 const char *
  48 battery_power(const char *bat)
  49 {
  50         int watts;
  51         char path[PATH_MAX];
  52
  53         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
  54         return (pscanf(path, "%i", &watts) == 1) ?
  55                bprintf("%d", (watts + 500000) / 1000000) : NULL;
  56 }
  57
  58 const char *
  59 battery_state(const char *bat)
  60 {
  61         struct {
  62                 char *state;
  63                 char *symbol;
  64         } map[] = {
  65                 { "Charging",    "+" },
  66                 { "Discharging", "-" },
  67                 { "Full",        "=" },
  68                 { "Unknown",     "/" },
  69         };
  70         size_t i;
  71         char path[PATH_MAX], state[12];
  72
  73         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
  74         if (pscanf(path, "%12s", state) != 1) {
  75                 return NULL;
  76         }
  77
  78         for (i = 0; i < LEN(map); i++) {
  79                 if (!strcmp(map[i].state, state)) {
  80                         break;
  81                 }
  82         }
  83         return (i == LEN(map)) ? "?" : map[i].symbol;
  84 }
  85 #endif