components/battery.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <errno.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5 #if defined(__linux__)
   6 #include <limits.h>
   7 #include <string.h>
   8 #elif defined(__OpenBSD__)
   9 #include <sys/ioctl.h>
  10 #include <fcntl.h>
  11 #include <unistd.h>
  12 #include <machine/apmvar.h>
  13 #endif
  14
  15 #include "../util.h"
  16
  17 const char *
  18 battery_perc(const char *bat)
  19 {
  20 #if defined(__linux__)
  21         int perc;
  22         char path[PATH_MAX];
  23
  24         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/capacity");
  25         return (pscanf(path, "%i", &perc) == 1) ?
  26                bprintf("%d", perc) : NULL;
  27 #elif defined(__OpenBSD__)
  28         struct apm_power_info apm_info;
  29         int fd;
  30
  31         fd = open("/dev/apm", O_RDONLY);
  32         if (fd < 0) {
  33                 fprintf(stderr, "open '/dev/apm': %s\n", strerror(errno));
  34                 return NULL;
  35         }
  36
  37         if (ioctl(fd, APM_IOC_GETPOWER, &apm_info) < 0) {
  38                 fprintf(stderr, "ioctl 'APM_IOC_GETPOWER': %s\n", strerror(errno));
  39                 close(fd);
  40                 return NULL;
  41         }
  42         close(fd);
  43
  44         return bprintf("%d", apm_info.battery_life);
  45 #endif
  46 }
  47
  48 #if defined(__linux__)
  49 const char *
  50 battery_power(const char *bat)
  51 {
  52         int watts;
  53         char path[PATH_MAX];
  54
  55         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/power_now");
  56         return (pscanf(path, "%i", &watts) == 1) ?
  57                bprintf("%d", (watts + 500000) / 1000000) : NULL;
  58 }
  59
  60 const char *
  61 battery_state(const char *bat)
  62 {
  63         struct {
  64                 char *state;
  65                 char *symbol;
  66         } map[] = {
  67                 { "Charging",    "+" },
  68                 { "Discharging", "-" },
  69                 { "Full",        "=" },
  70                 { "Unknown",     "/" },
  71         };
  72         size_t i;
  73         char path[PATH_MAX], state[12];
  74
  75         snprintf(path, sizeof(path), "%s%s%s", "/sys/class/power_supply/", bat, "/status");
  76         if (pscanf(path, "%12s", state) != 1) {
  77                 return NULL;
  78         }
  79
  80         for (i = 0; i < LEN(map); i++) {
  81                 if (!strcmp(map[i].state, state)) {
  82                         break;
  83                 }
  84         }
  85         return (i == LEN(map)) ? "?" : map[i].symbol;
  86 }
  87 #endif