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
   6 #include "../util.h"
   7
   8 #if defined(__linux__)
   9         #include <limits.h>
  10
  11         const char *
  12         battery_perc(const char *bat)
  13         {
  14                 int perc;
  15                 char path[PATH_MAX];
  16
  17                 if (esnprintf(path, sizeof(path),
  18                               "/sys/class/power_supply/%s/capacity",
  19                               bat) < 0) {
  20                         return NULL;
  21                 }
  22                 if (pscanf(path, "%d", &perc) != 1) {
  23                         return NULL;
  24                 }
  25
  26                 return bprintf("%d", perc);
  27         }
  28
  29         const char *
  30         battery_state(const char *bat)
  31         {
  32                 static struct {
  33                         char *state;
  34                         char *symbol;
  35                 } map[] = {
  36                         { "Charging",    "+" },
  37                         { "Discharging", "-" },
  38                 };
  39                 size_t i;
  40                 char path[PATH_MAX], state[12];
  41
  42                 if (esnprintf(path, sizeof(path),
  43                               "/sys/class/power_supply/%s/status",
  44                               bat) < 0) {
  45                         return NULL;
  46                 }
  47                 if (pscanf(path, "%12s", state) != 1) {
  48                         return NULL;
  49                 }
  50
  51                 for (i = 0; i < LEN(map); i++) {
  52                         if (!strcmp(map[i].state, state)) {
  53                                 break;
  54                         }
  55                 }
  56                 return (i == LEN(map)) ? "?" : map[i].symbol;
  57         }
  58
  59         const char *
  60         battery_remaining(const char *bat)
  61         {
  62                 int charge_now, current_now, m, h;
  63                 float timeleft;
  64                 char path[PATH_MAX], state[12];
  65
  66                 if (esnprintf(path, sizeof(path),
  67                               "/sys/class/power_supply/%s/status",
  68                               bat) < 0) {
  69                         return NULL;
  70                 }
  71                 if (pscanf(path, "%12s", state) != 1) {
  72                         return NULL;
  73                 }
  74
  75                 if (!strcmp(state, "Discharging")) {
  76                         if (esnprintf(path, sizeof(path),
  77                                       "/sys/class/power_supply/%s/charge_now",
  78                                       bat) < 0) {
  79                                 return NULL;
  80                         }
  81                         if (pscanf(path, "%d", &charge_now) != 1) {
  82                                 return NULL;
  83                         }
  84                         if (esnprintf(path, sizeof(path),
  85                                       "/sys/class/power_supply/%s/current_now",
  86                                       bat) < 0) {
  87                                 return NULL;
  88                         }
  89                         if (pscanf(path, "%d", &current_now) != 1) {
  90                                 return NULL;
  91                         }
  92
  93                         timeleft = (float)charge_now / (float)current_now;
  94                         h = timeleft;
  95                         m = (timeleft - (float)h) * 60;
  96
  97                         return bprintf("%dh %dm", h, m);
  98                 }
  99
 100                 return "";
 101         }
 102 #elif defined(__OpenBSD__)
 103         #include <fcntl.h>
 104         #include <machine/apmvar.h>
 105         #include <sys/ioctl.h>
 106         #include <unistd.h>
 107
 108         static int
 109         load_apm_power_info(struct apm_power_info *apm_info)
 110         {
 111                 int fd;
 112
 113                 fd = open("/dev/apm", O_RDONLY);
 114                 if (fd < 0) {
 115                         warn("open '/dev/apm':");
 116                         return 0;
 117                 }
 118
 119                 memset(apm_info, 0, sizeof(struct apm_power_info));
 120                 if (ioctl(fd, APM_IOC_GETPOWER, apm_info) < 0) {
 121                         warn("ioctl 'APM_IOC_GETPOWER':");
 122                         close(fd);
 123                         return 0;
 124                 }
 125                 return close(fd), 1;
 126         }
 127
 128         const char *
 129         battery_perc(const char *unused)
 130         {
 131                 struct apm_power_info apm_info;
 132
 133                 if (load_apm_power_info(&apm_info)) {
 134                         return bprintf("%d", apm_info.battery_life);
 135                 }
 136
 137                 return NULL;
 138         }
 139
 140         const char *
 141         battery_state(const char *unused)
 142         {
 143                 struct {
 144                         unsigned int state;
 145                         char *symbol;
 146                 } map[] = {
 147                         { APM_AC_ON,      "+" },
 148                         { APM_AC_OFF,     "-" },
 149                 };
 150                 struct apm_power_info apm_info;
 151                 size_t i;
 152
 153                 if (load_apm_power_info(&apm_info)) {
 154                         for (i = 0; i < LEN(map); i++) {
 155                                 if (map[i].state == apm_info.ac_state) {
 156                                         break;
 157                                 }
 158                         }
 159                         return (i == LEN(map)) ? "?" : map[i].symbol;
 160                 }
 161
 162                 return NULL;
 163         }
 164
 165         const char *
 166         battery_remaining(const char *unused)
 167         {
 168                 struct apm_power_info apm_info;
 169
 170                 if (load_apm_power_info(&apm_info)) {
 171                         if (apm_info.ac_state != APM_AC_ON) {
 172                                 return bprintf("%uh %02um", apm_info.minutes_left / 60,
 173                                                apm_info.minutes_left % 60);
 174                         } else {
 175                                 return "";
 176                         }
 177                 }
 178
 179                 return NULL;
 180         }
 181 #endif