components/battery.c

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