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

   1 // vim:ts=8:expandtab
   2 #include <ctype.h>
   3 #include <time.h>
   4 #include <string.h>
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <yajl/yajl_gen.h>
   8 #include <yajl/yajl_version.h>
   9
  10 #include "i3status.h"
  11
  12 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  13 #include <sys/types.h>
  14 #include <sys/sysctl.h>
  15 #endif
  16
  17 #if defined(__OpenBSD__)
  18 #include <sys/types.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/fcntl.h>
  21 #include <machine/apmvar.h>
  22 #endif
  23
  24 #define BATT_STATUS_NAME(status) \
  25     (status == CS_CHARGING ? "CHR" : \
  26         (status == CS_DISCHARGING ? "BAT" : "FULL"))
  27 /*
  28  * Get battery information from /sys. Note that it uses the design capacity to
  29  * calculate the percentage, not the last full capacity, so you can see how
  30  * worn off your battery is.
  31  *
  32  */
  33 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) {
  34         time_t empty_time;
  35         struct tm *empty_tm;
  36         char buf[1024];
  37         char statusbuf[16];
  38         char percentagebuf[16];
  39         char remainingbuf[256];
  40         char emptytimebuf[256];
  41         char consumptionbuf[256];
  42         const char *walk, *last;
  43         char *outwalk = buffer;
  44         bool watt_as_unit;
  45         bool colorful_output;
  46         int full_design = -1,
  47             remaining = -1,
  48             present_rate = -1,
  49             voltage = -1;
  50         charging_status_t status = CS_DISCHARGING;
  51
  52         memset(statusbuf, '\0', sizeof(statusbuf));
  53         memset(percentagebuf, '\0', sizeof(percentagebuf));
  54         memset(remainingbuf, '\0', sizeof(remainingbuf));
  55         memset(emptytimebuf, '\0', sizeof(emptytimebuf));
  56         memset(consumptionbuf, '\0', sizeof(consumptionbuf));
  57
  58         INSTANCE(path);
  59
  60 #if defined(LINUX)
  61         static char batpath[512];
  62         sprintf(batpath, path, number);
  63         if (!slurp(batpath, buf, sizeof(buf))) {
  64                 OUTPUT_FULL_TEXT("No battery");
  65                 return;
  66         }
  67
  68         for (walk = buf, last = buf; (walk-buf) < 1024; walk++) {
  69                 if (*walk == '\n') {
  70                         last = walk+1;
  71                         continue;
  72                 }
  73
  74                 if (*walk != '=')
  75                         continue;
  76
  77                 if (BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_NOW")) {
  78                         watt_as_unit = true;
  79                         remaining = atoi(walk+1);
  80                 }
  81                 else if (BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_NOW")) {
  82                         watt_as_unit = false;
  83                         remaining = atoi(walk+1);
  84                 }
  85                 else if (BEGINS_WITH(last, "POWER_SUPPLY_CURRENT_NOW"))
  86                         present_rate = atoi(walk+1);
  87                 else if (BEGINS_WITH(last, "POWER_SUPPLY_VOLTAGE_NOW"))
  88                         voltage = atoi(walk+1);
  89                 /* on some systems POWER_SUPPLY_POWER_NOW does not exist, but actually
  90                  * it is the same as POWER_SUPPLY_CURRENT_NOW but with μWh as
  91                  * unit instead of μAh. We will calculate it as we need it
  92                  * later. */
  93                 else if (BEGINS_WITH(last, "POWER_SUPPLY_POWER_NOW"))
  94                         present_rate = atoi(walk+1);
  95                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Charging"))
  96                         status = CS_CHARGING;
  97                 else if (BEGINS_WITH(last, "POWER_SUPPLY_STATUS=Full"))
  98                         status = CS_FULL;
  99                 else {
 100                         /* The only thing left is the full capacity */
 101                         if (last_full_capacity) {
 102                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL") &&
 103                                     !BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL"))
 104                                         continue;
 105                         } else {
 106                                 if (!BEGINS_WITH(last, "POWER_SUPPLY_CHARGE_FULL_DESIGN") &&
 107                                     !BEGINS_WITH(last, "POWER_SUPPLY_ENERGY_FULL_DESIGN"))
 108                                         continue;
 109                         }
 110
 111                         full_design = atoi(walk+1);
 112                 }
 113         }
 114
 115         /* the difference between POWER_SUPPLY_ENERGY_NOW and
 116          * POWER_SUPPLY_CHARGE_NOW is the unit of measurement. The energy is
 117          * given in mWh, the charge in mAh. So calculate every value given in
 118          * ampere to watt */
 119         if (!watt_as_unit) {
 120             present_rate = (((float)voltage / 1000.0) * ((float)present_rate / 1000.0));
 121             remaining = (((float)voltage / 1000.0) * ((float)remaining / 1000.0));
 122             full_design = (((float)voltage / 1000.0) * ((float)full_design / 1000.0));
 123         }
 124
 125         if ((full_design == -1) || (remaining == -1)) {
 126                 OUTPUT_FULL_TEXT("No battery");
 127                 return;
 128         }
 129
 130         (void)snprintf(statusbuf, sizeof(statusbuf), "%s", BATT_STATUS_NAME(status));
 131
 132         float percentage_remaining = (((float)remaining / (float)full_design) * 100);
 133         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%.02f%%", percentage_remaining);
 134
 135         if (present_rate > 0) {
 136                 float remaining_time;
 137                 int seconds, hours, minutes, seconds_remaining;
 138                 if (status == CS_CHARGING)
 139                         remaining_time = ((float)full_design - (float)remaining) / (float)present_rate;
 140                 else if (status == CS_DISCHARGING)
 141                         remaining_time = ((float)remaining / (float)present_rate);
 142                 else remaining_time = 0;
 143
 144                 seconds_remaining = (int)(remaining_time * 3600.0);
 145
 146                 hours = seconds_remaining / 3600;
 147                 seconds = seconds_remaining - (hours * 3600);
 148                 minutes = seconds / 60;
 149                 seconds -= (minutes * 60);
 150
 151                 if (status == CS_DISCHARGING && low_threshold > 0) {
 152                         if (strncmp(threshold_type, "percentage", strlen(threshold_type)) == 0
 153                                 && percentage_remaining < low_threshold) {
 154                                 START_COLOR("color_bad");
 155                                 colorful_output = true;
 156                         } else if (strncmp(threshold_type, "time", strlen(threshold_type)) == 0
 157                                 && seconds_remaining < 60 * low_threshold) {
 158                                 START_COLOR("color_bad");
 159                                 colorful_output = true;
 160                         }
 161                 }
 162
 163                 (void)snprintf(remainingbuf, sizeof(remainingbuf), "%02d:%02d:%02d",
 164                         max(hours, 0), max(minutes, 0), max(seconds, 0));
 165
 166                 empty_time = time(NULL);
 167                 empty_time += seconds_remaining;
 168                 empty_tm = localtime(&empty_time);
 169
 170                 (void)snprintf(emptytimebuf, sizeof(emptytimebuf), "%02d:%02d:%02d",
 171                         max(empty_tm->tm_hour, 0), max(empty_tm->tm_min, 0), max(empty_tm->tm_sec, 0));
 172
 173                 (void)snprintf(consumptionbuf, sizeof(consumptionbuf), "%1.2fW",
 174                         ((float)present_rate / 1000.0 / 1000.0));
 175
 176                 if (colorful_output)
 177                     END_COLOR;
 178         }
 179 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 180         int state;
 181         int sysctl_rslt;
 182         size_t sysctl_size = sizeof(sysctl_rslt);
 183
 184         if (sysctlbyname(BATT_LIFE, &sysctl_rslt, &sysctl_size, NULL, 0) != 0) {
 185                 OUTPUT_FULL_TEXT("No battery");
 186                 return;
 187         }
 188
 189         present_rate = sysctl_rslt;
 190         if (sysctlbyname(BATT_TIME, &sysctl_rslt, &sysctl_size, NULL, 0) != 0) {
 191                 OUTPUT_FULL_TEXT("No battery");
 192                 return;
 193         }
 194
 195         remaining = sysctl_rslt;
 196         if (sysctlbyname(BATT_STATE, &sysctl_rslt, &sysctl_size, NULL,0) != 0) {
 197                 OUTPUT_FULL_TEXT("No battery");
 198                 return;
 199         }
 200
 201         state = sysctl_rslt;
 202         if (state == 0 && present_rate == 100)
 203                 status = CS_FULL;
 204         else if (state == 0 && present_rate < 100)
 205                 status = CS_CHARGING;
 206         else
 207                 status = CS_DISCHARGING;
 208
 209         full_design = sysctl_rslt;
 210
 211         (void)snprintf(statusbuf, sizeof(statusbuf), "%s", BATT_STATUS_NAME(status));
 212
 213         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%02d%%",
 214                        present_rate);
 215
 216         if (state == 1) {
 217                 int hours, minutes;
 218                 minutes = remaining;
 219                 hours = minutes / 60;
 220                 minutes -= (hours * 60);
 221                 (void)snprintf(remainingbuf, sizeof(remainingbuf), "%02dh%02d",
 222                                max(hours, 0), max(minutes, 0));
 223         }
 224 #elif defined(__OpenBSD__)
 225         /*
 226          * We're using apm(4) here, which is the interface to acpi(4) on amd64/i386 and
 227          * the generic interface on macppc/sparc64/zaurus, instead of using sysctl(3) and
 228          * probing acpi(4) devices.
 229          */
 230         struct apm_power_info apm_info;
 231         int apm_fd, ac_status, charging;
 232
 233         apm_fd = open("/dev/apm", O_RDONLY);
 234         if (apm_fd < 0) {
 235                 OUTPUT_FULL_TEXT("can't open /dev/apm");
 236                 return;
 237         }
 238         if (ioctl(apm_fd, APM_IOC_GETPOWER, &apm_info) < 0)
 239                 OUTPUT_FULL_TEXT("can't read power info");
 240
 241         close(apm_fd);
 242
 243         /* Don't bother to go further if there's no battery present. */
 244         if ((apm_info.battery_state == APM_BATTERY_ABSENT) ||
 245             (apm_info.battery_state == APM_BATT_UNKNOWN)) {
 246                 OUTPUT_FULL_TEXT("No battery");
 247                 return;
 248         }
 249
 250         switch(apm_info.ac_state) {
 251         case APM_AC_OFF:
 252                 ac_status = CS_DISCHARGING;
 253                 break;
 254         case APM_AC_ON:
 255                 ac_status = CS_CHARGING;
 256                 break;
 257         default:
 258                 /* If we don't know what's going on, just assume we're discharging. */
 259                 ac_status = CS_DISCHARGING;
 260                 break;
 261         }
 262
 263         (void)snprintf(statusbuf, sizeof(statusbuf), "%s", BATT_STATUS_NAME(status));
 264         (void)snprintf(percentagebuf, sizeof(percentagebuf), "%02d%%", apm_info.battery_life);
 265
 266         /* Can't give a meaningful value for remaining minutes if we're charging. */
 267         if (ac_status == CS_CHARGING)
 268                 charging = 1;
 269
 270         (void)snprintf(remainingbuf, sizeof(remainingbuf), (charging ? "%s" : "%d"),
 271                        (charging ? "(CHR)" : apm_info.minutes_left));
 272 #endif
 273
 274 #define EAT_SPACE_FROM_OUTPUT_IF_EMPTY(_buf) \
 275         do { \
 276                 if (strlen(_buf) == 0) { \
 277                         if (outwalk > buffer && isspace(outwalk[-1])) \
 278                                 outwalk--; \
 279                         else if (isspace(*(walk+1))) \
 280                                 walk++; \
 281                 } \
 282         } while (0)
 283
 284         for (walk = format; *walk != '\0'; walk++) {
 285                 if (*walk != '%') {
 286                         *(outwalk++) = *walk;
 287                         continue;
 288                 }
 289
 290                 if (strncmp(walk+1, "status", strlen("status")) == 0) {
 291                         outwalk += sprintf(outwalk, "%s", statusbuf);
 292                         walk += strlen("status");
 293                 } else if (strncmp(walk+1, "percentage", strlen("percentage")) == 0) {
 294                         outwalk += sprintf(outwalk, "%s", percentagebuf);
 295                         walk += strlen("percentage");
 296                 } else if (strncmp(walk+1, "remaining", strlen("remaining")) == 0) {
 297                         outwalk += sprintf(outwalk, "%s", remainingbuf);
 298                         walk += strlen("remaining");
 299                         EAT_SPACE_FROM_OUTPUT_IF_EMPTY(remainingbuf);
 300                 } else if (strncmp(walk+1, "emptytime", strlen("emptytime")) == 0) {
 301                         outwalk += sprintf(outwalk, "%s", emptytimebuf);
 302                         walk += strlen("emptytime");
 303                         EAT_SPACE_FROM_OUTPUT_IF_EMPTY(emptytimebuf);
 304                 } else if (strncmp(walk+1, "consumption", strlen("consumption")) == 0) {
 305                         outwalk += sprintf(outwalk, "%s", consumptionbuf);
 306                         walk += strlen("consumption");
 307                         EAT_SPACE_FROM_OUTPUT_IF_EMPTY(consumptionbuf);
 308                 }
 309         }
 310
 311         OUTPUT_FULL_TEXT(buffer);
 312 }