components/battery.c

   1 /* See LICENSE file for copyright and license details. */
   2 #include <stdio.h>
   3 #include <string.h>
   4
   5 #include "../util.h"
   6
   7 #if defined(__linux__)
   8         #include <limits.h>
   9         #include <stdint.h>
  10         #include <unistd.h>
  11
  12         static const char *
  13         pick(const char *bat, const char *f1, const char *f2, char *path,
  14              size_t length)
  15         {
  16                 if (esnprintf(path, length, f1, bat) > 0 &&
  17                     access(path, R_OK) == 0) {
  18                         return f1;
  19                 }
  20
  21                 if (esnprintf(path, length, f2, bat) > 0 &&
  22                     access(path, R_OK) == 0) {
  23                         return f2;
  24                 }
  25
  26                 return NULL;
  27         }
  28
  29         const char *
  30         battery_perc(const char *bat)
  31         {
  32                 int perc;
  33                 char path[PATH_MAX];
  34
  35                 if (esnprintf(path, sizeof(path),
  36                               "/sys/class/power_supply/%s/capacity", bat) < 0) {
  37                         return NULL;
  38                 }
  39                 if (pscanf(path, "%d", &perc) != 1) {
  40                         return NULL;
  41                 }
  42
  43                 return bprintf("%d", perc);
  44         }
  45
  46         const char *
  47         battery_state(const char *bat)
  48         {
  49                 static struct {
  50                         char *state;
  51                         char *symbol;
  52                 } map[] = {
  53                         { "Charging",    "+" },
  54                         { "Discharging", "-" },
  55                 };
  56                 size_t i;
  57                 char path[PATH_MAX], state[12];
  58
  59                 if (esnprintf(path, sizeof(path),
  60                               "/sys/class/power_supply/%s/status", bat) < 0) {
  61                         return NULL;
  62                 }
  63                 if (pscanf(path, "%12s", state) != 1) {
  64                         return NULL;
  65                 }
  66
  67                 for (i = 0; i < LEN(map); i++) {
  68                         if (!strcmp(map[i].state, state)) {
  69                                 break;
  70                         }
  71                 }
  72                 return (i == LEN(map)) ? "?" : map[i].symbol;
  73         }
  74
  75         const char *
  76         battery_remaining(const char *bat)
  77         {
  78                 uintmax_t charge_now, current_now, m, h;
  79                 double timeleft;
  80                 char path[PATH_MAX], state[12];
  81
  82                 if (esnprintf(path, sizeof(path),
  83                               "/sys/class/power_supply/%s/status", bat) < 0) {
  84                         return NULL;
  85                 }
  86                 if (pscanf(path, "%12s", state) != 1) {
  87                         return NULL;
  88                 }
  89
  90                 if (!pick(bat, "/sys/class/power_supply/%s/charge_now",
  91                           "/sys/class/power_supply/%s/energy_now", path,
  92                           sizeof(path)) ||
  93                     pscanf(path, "%ju", &charge_now) < 0) {
  94                         return NULL;
  95                 }
  96
  97                 if (!strcmp(state, "Discharging")) {
  98                         if (!pick(bat, "/sys/class/power_supply/%s/current_now",
  99                                   "/sys/class/power_supply/%s/power_now", path,
 100                                   sizeof(path)) ||
 101                             pscanf(path, "%ju", &current_now) < 0) {
 102                                 return NULL;
 103                         }
 104
 105                         if (current_now == 0) {
 106                                 return NULL;
 107                         }
 108
 109                         timeleft = (double)charge_now / (double)current_now;
 110                         h = timeleft;
 111                         m = (timeleft - (double)h) * 60;
 112
 113                         return bprintf("%juh %jum", h, m);
 114                 }
 115
 116                 return "";
 117         }
 118 #elif defined(__OpenBSD__)
 119         #include <fcntl.h>
 120         #include <machine/apmvar.h>
 121         #include <sys/ioctl.h>
 122         #include <unistd.h>
 123
 124         static int
 125         load_apm_power_info(struct apm_power_info *apm_info)
 126         {
 127                 int fd;
 128
 129                 fd = open("/dev/apm", O_RDONLY);
 130                 if (fd < 0) {
 131                         warn("open '/dev/apm':");
 132                         return 0;
 133                 }
 134
 135                 memset(apm_info, 0, sizeof(struct apm_power_info));
 136                 if (ioctl(fd, APM_IOC_GETPOWER, apm_info) < 0) {
 137                         warn("ioctl 'APM_IOC_GETPOWER':");
 138                         close(fd);
 139                         return 0;
 140                 }
 141                 return close(fd), 1;
 142         }
 143
 144         const char *
 145         battery_perc(const char *unused)
 146         {
 147                 struct apm_power_info apm_info;
 148
 149                 if (load_apm_power_info(&apm_info)) {
 150                         return bprintf("%d", apm_info.battery_life);
 151                 }
 152
 153                 return NULL;
 154         }
 155
 156         const char *
 157         battery_state(const char *unused)
 158         {
 159                 struct {
 160                         unsigned int state;
 161                         char *symbol;
 162                 } map[] = {
 163                         { APM_AC_ON,      "+" },
 164                         { APM_AC_OFF,     "-" },
 165                 };
 166                 struct apm_power_info apm_info;
 167                 size_t i;
 168
 169                 if (load_apm_power_info(&apm_info)) {
 170                         for (i = 0; i < LEN(map); i++) {
 171                                 if (map[i].state == apm_info.ac_state) {
 172                                         break;
 173                                 }
 174                         }
 175                         return (i == LEN(map)) ? "?" : map[i].symbol;
 176                 }
 177
 178                 return NULL;
 179         }
 180
 181         const char *
 182         battery_remaining(const char *unused)
 183         {
 184                 struct apm_power_info apm_info;
 185
 186                 if (load_apm_power_info(&apm_info)) {
 187                         if (apm_info.ac_state != APM_AC_ON) {
 188                                 return bprintf("%uh %02um",
 189                                                apm_info.minutes_left / 60,
 190                                                apm_info.minutes_left % 60);
 191                         } else {
 192                                 return "";
 193                         }
 194                 }
 195
 196                 return NULL;
 197         }
 198 #endif