git.sur5r.net Git - i3/i3status/blob - src/print_battery_info.c

   1 // vim:ts=8:expandtab
   2 #include <time.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <yajl/yajl_gen.h>
   7 #include <yajl/yajl_version.h>
   8
   9 #include "i3status.h"
  10
  11 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  12 #include <sys/types.h>
  13 #include <sys/sysctl.h>
  14 #endif
  15
  16 #if defined(__OpenBSD__)
  17 #include <sys/types.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/fcntl.h>
  20 #include <machine/apmvar.h>
  21 #endif
  22
  23 #define BATT_STATUS_NAME(status) \
  24     (status == CS_CHARGING ? "CHR" : \
  25         (status == CS_DISCHARGING ? "BAT" : "FULL"))
  26 /*
  27  * Get battery information from /sys. Note that it uses the design capacity to
  28  * calculate the percentage, not the last full capacity, so you can see how
  29  * worn off your battery is.
  30  *
  31  */
  32 void print_battery_info(yajl_gen json_gen, char *buffer, int number, const char *path, const char *format, int low_threshold, char *threshold_type, bool last_full_capacity) {
  33         time_t empty_time;
  34         struct tm *empty_tm;
  35         char buf[1024];
  36         char statusbuf[16];
  37         char percentagebuf[16];
  38         char remainingbuf[256];
  39         char emptytimebuf[256];
  40         char consumptionbuf[256];
  41         const char *walk, *last;
  42         char *outwalk = buffer;
  43         bool watt_as_unit;
  44         int full_design = -1,
  45             remaining = -1,
  46             present_rate = -1,
  47             voltage = -1;
  48         charging_status_t status = CS_DISCHARGING;
  49
  50         memset(statusbuf, '\0', sizeof(statusbuf));
  51         memset(percentagebuf, '\0', sizeof(percentagebuf));
  52         memset(remainingbuf, '\0', sizeof(remainingbuf));
  53         memset(emptytimebuf, '\0', sizeof(emptytimebuf));
  54         memset(consumptionbuf, '\0', sizeof(consumptionbuf));
  55
  56         INSTANCE(path);
  57
  58 #if defined(LINUX)
  59         static char batpath[512];
  60         sprintf(batpath, path, number);
  61         if (!slurp(batpath, buf, sizeof(buf))) {
  62                 OUTPUT_FULL_TEXT("No battery");
  63                 return;
  64         }
  65
  66         for (walk = buf, last = buf; (walk-buf) < 1024; walk++) {
  67                 if (*walk == '\n') {
  68                         last = walk+1;
  69                         continue;
  70                 }
  71
  72                 if (*walk != '=')
  73                         continue;
  74
  75                 if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_NOW")) {
  76                         watt_as_unit = true;
  77                         remaining = atoi(walk+1);
  78                 }
  79                 else if (BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_NOW")) {
  80                         watt_as_unit = false;
  81                         remaining = atoi(walk+1);
  82                 }
  83                 else if (BEGINS_WITH(last, "POWER_SUPPLY_CURRENT_NOW"))
  84                         present_rate = atoi(walk+1);
  85                 else if (BEGINS_WITH(last, "POWER_SUPPLY_VOLTAGE_NOW"))
  86                         voltage = atoi(walk+1);
  87                 /* on some systems POWER_SUPPLY_POWER_NOW does not exist, but actually
  88                  * it is the same as POWER_SUPPLY_CURRENT_NOW but with μWh as
  89                  * unit instead of μAh. We will calculate it as we need it
  90                  * later. */
  91                 else if (BEGINS_WITH(last, "POWER_SUPPLY_POWER_NOW"))
  92                         present_rate = atoi(walk+1);
  93                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Charging"))
  94                         status = CS_CHARGING;
  95                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Full"))
  96                         status = CS_FULL;
  97                 else {
  98                         /* The only thing left is the full capacity */
  99                         if (last_full_capacity) {
 100                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL") &&
 101                                     !BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL"))
 102                                         continue;
 103                         } else {
 104                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL_DESIGN") &&
 105                                     !BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN"))
 106                                         continue;
 107                         }
 108
 109                         full_design = atoi(walk+1);
 110                 }
 111         }
 112
 113         /* the difference between POWER_SUPPLY_ENERGY_NOW and
 114          * POWER_SUPPLY_CHARGE_NOW is the unit of measurement. The energy is
 115          * given in mWh, the charge in mAh. So calculate every value given in
 116          * ampere to watt */
 117         if (!watt_as_unit) {
 118             present_rate = (((float)voltage / 1000.0) * ((float)present_rate / 1000.0));
 119             remaining = (((float)voltage / 1000.0) * ((float)remaining / 1000.0));
 120             full_design = (((float)voltage / 1000.0) * ((float)full_design / 1000.0));
 121         }
 122
 123         if ((full_design == -1) || (remaining == -1)) {
 124                 OUTPUT_FULL_TEXT("No battery");
 125                 return;
 126         }
 127
 128         (void)snprintf(statusbuf, sizeof(statusbuf), "%s", BATT_STATUS_NAME(status));
 129
 130         float percentage_remaining = (((float)remaining / (float)full_design) * 100);
 131         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%.02f%%", percentage_remaining);
 132
 133         if (present_rate > 0) {
 134                 float remaining_time;
 135                 int seconds, hours, minutes, seconds_remaining;
 136                 if (status == CS_CHARGING)
 137                         remaining_time = ((float)full_design - (float)remaining) / (float)present_rate;
 138                 else if (status == CS_DISCHARGING)
 139                         remaining_time = ((float)remaining / (float)present_rate);
 140                 else remaining_time = 0;
 141
 142                 seconds_remaining = (int)(remaining_time * 3600.0);
 143
 144                 hours = seconds_remaining / 3600;
 145                 seconds = seconds_remaining - (hours * 3600);
 146                 minutes = seconds / 60;
 147                 seconds -= (minutes * 60);
 148
 149                 if (status == CS_DISCHARGING && low_threshold > 0) {
 150                         if (strncmp(threshold_type, "percentage", strlen(threshold_type)) == 0
 151                                 && percentage_remaining < low_threshold) {
 152                                 START_COLOR("color_bad");
 153                         } else if (strncmp(threshold_type, "time", strlen(threshold_type)) == 0
 154                                 && seconds_remaining < 60 * low_threshold) {
 155                                 START_COLOR("color_bad");
 156                         }
 157                 }
 158
 159                 (void)snprintf(remainingbuf, sizeof(remainingbuf), "%02d:%02d:%02d",
 160                         max(hours, 0), max(minutes, 0), max(seconds, 0));
 161
 162                 empty_time = time(NULL);
 163                 empty_time += seconds_remaining;
 164                 empty_tm = localtime(&empty_time);
 165
 166                 (void)snprintf(emptytimebuf, sizeof(emptytimebuf), "%02d:%02d:%02d",
 167                         max(empty_tm->tm_hour, 0), max(empty_tm->tm_min, 0), max(empty_tm->tm_sec, 0));
 168
 169                 (void)snprintf(consumptionbuf, sizeof(consumptionbuf), "%1.2fW",
 170                         ((float)present_rate / 1000.0 / 1000.0));
 171
 172                 END_COLOR;
 173         }
 174 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 175         int state;
 176         int sysctl_rslt;
 177         size_t sysctl_size = sizeof(sysctl_rslt);
 178
 179         if (sysctlbyname(BATT_LIFE, &sysctl_rslt, &sysctl_size, NULL, 0) != 0) {
 180                 OUTPUT_FULL_TEXT("No battery");
 181                 return;
 182         }
 183
 184         present_rate = sysctl_rslt;
 185         if (sysctlbyname(BATT_TIME, &sysctl_rslt, &sysctl_size, NULL, 0) != 0) {
 186                 OUTPUT_FULL_TEXT("No battery");
 187                 return;
 188         }
 189
 190         remaining = sysctl_rslt;
 191         if (sysctlbyname(BATT_STATE, &sysctl_rslt, &sysctl_size, NULL,0) != 0) {
 192                 OUTPUT_FULL_TEXT("No battery");
 193                 return;
 194         }
 195
 196         state = sysctl_rslt;
 197         if (state == 0 && present_rate == 100)
 198                 status = CS_FULL;
 199         else if (state == 0 && present_rate < 100)
 200                 status = CS_CHARGING;
 201         else
 202                 status = CS_DISCHARGING;
 203
 204         full_design = sysctl_rslt;
 205
 206         (void)snprintf(statusbuf, sizeof(statusbuf), "%s", BATT_STATUS_NAME(status));
 207
 208         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%02d%%",
 209                        present_rate);
 210
 211         if (state == 1) {
 212                 int hours, minutes;
 213                 minutes = remaining;
 214                 hours = minutes / 60;
 215                 minutes -= (hours * 60);
 216                 (void)snprintf(remainingbuf, sizeof(remainingbuf), "%02dh%02d",
 217                                max(hours, 0), max(minutes, 0));
 218         }
 219 #elif defined(__OpenBSD__)
 220         /*
 221          * We're using apm(4) here, which is the interface to acpi(4) on amd64/i386 and
 222          * the generic interface on macppc/sparc64/zaurus, instead of using sysctl(3) and
 223          * probing acpi(4) devices.
 224          */
 225         struct apm_power_info apm_info;
 226         int apm_fd, ac_status, charging;
 227
 228         apm_fd = open("/dev/apm", O_RDONLY);
 229         if (apm_fd < 0) {
 230                 OUTPUT_FULL_TEXT("can't open /dev/apm");
 231                 return;
 232         }
 233         if (ioctl(apm_fd, APM_IOC_GETPOWER, &apm_info) < 0)
 234                 OUTPUT_FULL_TEXT("can't read power info");
 235
 236         close(apm_fd);
 237
 238         /* Don't bother to go further if there's no battery present. */
 239         if ((apm_info.battery_state == APM_BATTERY_ABSENT) ||
 240             (apm_info.battery_state == APM_BATT_UNKNOWN)) {
 241                 OUTPUT_FULL_TEXT("No battery");
 242                 return;
 243         }
 244
 245         switch(apm_info.ac_state) {
 246         case APM_AC_OFF:
 247                 ac_status = CS_DISCHARGING;
 248                 break;
 249         case APM_AC_ON:
 250                 ac_status = CS_CHARGING;
 251                 break;
 252         default:
 253                 /* If we don't know what's going on, just assume we're discharging. */
 254                 ac_status = CS_DISCHARGING;
 255                 break;
 256         }
 257
 258         (void)snprintf(statusbuf, sizeof(statusbuf), "%s", BATT_STATUS_NAME(status));
 259         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%02d%%", apm_info.battery_life);
 260
 261         /* Can't give a meaningful value for remaining minutes if we're charging. */
 262         if (ac_status == CS_CHARGING)
 263                 charging = 1;
 264
 265         (void)snprintf(remainingbuf, sizeof(remainingbuf), (charging ? "%s" : "%d"),
 266                        (charging ? "(CHR)" : apm_info.minutes_left));
 267 #endif
 268
 269         for (walk = format; *walk != '\0'; walk++) {
 270                 if (*walk != '%') {
 271                         *(outwalk++) = *walk;
 272                         continue;
 273                 }
 274
 275                 if (strncmp(walk+1, "status", strlen("status")) == 0) {
 276                         outwalk += sprintf(outwalk, "%s", statusbuf);
 277                         walk += strlen("status");
 278                 } else if (strncmp(walk+1, "percentage", strlen("percentage")) == 0) {
 279                         outwalk += sprintf(outwalk, "%s", percentagebuf);
 280                         walk += strlen("percentage");
 281                 } else if (strncmp(walk+1, "remaining", strlen("remaining")) == 0) {
 282                         outwalk += sprintf(outwalk, "%s", remainingbuf);
 283                         walk += strlen("remaining");
 284                 } else if (strncmp(walk+1, "emptytime", strlen("emptytime")) == 0) {
 285                         outwalk += sprintf(outwalk, "%s", emptytimebuf);
 286                         walk += strlen("emptytime");
 287                 } else if (strncmp(walk+1, "consumption", strlen("consumption")) == 0) {
 288                         outwalk += sprintf(outwalk, "%s", consumptionbuf);
 289                         walk += strlen("consumption");
 290                 }
 291         }
 292
 293         OUTPUT_FULL_TEXT(buffer);
 294 }