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",
  37                               bat) < 0) {
  38                         return NULL;
  39                 }
  40                 if (pscanf(path, "%d", &perc) != 1) {
  41                         return NULL;
  42                 }
  43
  44                 return bprintf("%d", perc);
  45         }
  46
  47         const char *
  48         battery_state(const char *bat)
  49         {
  50                 static struct {
  51                         char *state;
  52                         char *symbol;
  53                 } map[] = {
  54                         { "Charging",    "+" },
  55                         { "Discharging", "-" },
  56                 };
  57                 size_t i;
  58                 char path[PATH_MAX], state[12];
  59
  60                 if (esnprintf(path, sizeof(path),
  61                               "/sys/class/power_supply/%s/status",
  62                               bat) < 0) {
  63                         return NULL;
  64                 }
  65                 if (pscanf(path, "%12s", state) != 1) {
  66                         return NULL;
  67                 }
  68
  69                 for (i = 0; i < LEN(map); i++) {
  70                         if (!strcmp(map[i].state, state)) {
  71                                 break;
  72                         }
  73                 }
  74                 return (i == LEN(map)) ? "?" : map[i].symbol;
  75         }
  76
  77         const char *
  78         battery_remaining(const char *bat)
  79         {
  80                 uintmax_t charge_now, current_now, m, h;
  81                 double timeleft;
  82                 char path[PATH_MAX], state[12];
  83
  84                 if (esnprintf(path, sizeof(path),
  85                               "/sys/class/power_supply/%s/status",
  86                               bat) < 0) {
  87                         return NULL;
  88                 }
  89                 if (pscanf(path, "%12s", state) != 1) {
  90                         return NULL;
  91                 }
  92
  93                 if (!pick(bat, "/sys/class/power_supply/%s/charge_now",
  94                           "/sys/class/power_supply/%s/energy_now",
  95                           path, sizeof(path)) ||
  96                     pscanf(path, "%ju", &charge_now) < 0) {
  97                         return NULL;
  98                 }
  99
 100                 if (!strcmp(state, "Discharging")) {
 101                         if (!pick(bat, "/sys/class/power_supply/%s/current_now",
 102                                   "/sys/class/power_supply/%s/power_now", path,
 103                                   sizeof(path)) ||
 104                             pscanf(path, "%ju", &current_now) < 0) {
 105                                 return NULL;
 106                         }
 107
 108                         if (current_now == 0) {
 109                                 return NULL;
 110                         }
 111
 112                         timeleft = (double)charge_now / (double)current_now;
 113                         h = timeleft;
 114                         m = (timeleft - (double)h) * 60;
 115
 116                         return bprintf("%juh %jum", h, m);
 117                 }
 118
 119                 return "";
 120         }
 121 #elif defined(__OpenBSD__)
 122         #include <fcntl.h>
 123         #include <machine/apmvar.h>
 124         #include <sys/ioctl.h>
 125         #include <unistd.h>
 126
 127         static int
 128         load_apm_power_info(struct apm_power_info *apm_info)
 129         {
 130                 int fd;
 131
 132                 fd = open("/dev/apm", O_RDONLY);
 133                 if (fd < 0) {
 134                         warn("open '/dev/apm':");
 135                         return 0;
 136                 }
 137
 138                 memset(apm_info, 0, sizeof(struct apm_power_info));
 139                 if (ioctl(fd, APM_IOC_GETPOWER, apm_info) < 0) {
 140                         warn("ioctl 'APM_IOC_GETPOWER':");
 141                         close(fd);
 142                         return 0;
 143                 }
 144                 return close(fd), 1;
 145         }
 146
 147         const char *
 148         battery_perc(const char *unused)
 149         {
 150                 struct apm_power_info apm_info;
 151
 152                 if (load_apm_power_info(&apm_info)) {
 153                         return bprintf("%d", apm_info.battery_life);
 154                 }
 155
 156                 return NULL;
 157         }
 158
 159         const char *
 160         battery_state(const char *unused)
 161         {
 162                 struct {
 163                         unsigned int state;
 164                         char *symbol;
 165                 } map[] = {
 166                         { APM_AC_ON,      "+" },
 167                         { APM_AC_OFF,     "-" },
 168                 };
 169                 struct apm_power_info apm_info;
 170                 size_t i;
 171
 172                 if (load_apm_power_info(&apm_info)) {
 173                         for (i = 0; i < LEN(map); i++) {
 174                                 if (map[i].state == apm_info.ac_state) {
 175                                         break;
 176                                 }
 177                         }
 178                         return (i == LEN(map)) ? "?" : map[i].symbol;
 179                 }
 180
 181                 return NULL;
 182         }
 183
 184         const char *
 185         battery_remaining(const char *unused)
 186         {
 187                 struct apm_power_info apm_info;
 188
 189                 if (load_apm_power_info(&apm_info)) {
 190                         if (apm_info.ac_state != APM_AC_ON) {
 191                                 return bprintf("%uh %02um",
 192                                                apm_info.minutes_left / 60,
 193                                                apm_info.minutes_left % 60);
 194                         } else {
 195                                 return "";
 196                         }
 197                 }
 198
 199                 return NULL;
 200         }
 201 #endif