wmbattery/sonypi.c

   1 #include <stdio.h>
   2 #include <sys/ioctl.h>
   3 #include "apm.h"
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6 #include <fcntl.h>
   7 #include <stdint.h>
   8
   9 #include "sonypi.h"
  10
  11 signed int spicfd = -1;
  12
  13 int sonypi_supported(void)
  14 {
  15         spicfd = open("/dev/sonypi", O_RDWR);
  16         if (spicfd == -1)
  17                 return 0;
  18         else
  19                 return 1;
  20 }
  21
  22 inline int sonypi_ioctl(int ioctlno, void *param)
  23 {
  24         if (ioctl(spicfd, ioctlno, param) < 0)
  25                 return 0;
  26         else
  27                 return 1;
  28 }
  29
  30 /* Read battery info from sonypi device and shove it into an apm_info
  31  * struct. */
  32 int sonypi_read(apm_info *info)
  33 {
  34         uint8_t batflags;
  35         uint16_t cap, rem;
  36         int havebatt = 0;
  37
  38         info->using_minutes = info->battery_flags = 0;
  39
  40         if (!sonypi_ioctl(SONYPI_IOCGBATFLAGS, &batflags))
  41                 return 1;
  42
  43         info->ac_line_status = (batflags & SONYPI_BFLAGS_AC) != 0;
  44         if (batflags & SONYPI_BFLAGS_B1) {
  45                 if (!sonypi_ioctl(SONYPI_IOCGBAT1CAP, &cap))
  46                         return 1;
  47                 if (!sonypi_ioctl(SONYPI_IOCGBAT1REM, &rem))
  48                         return 1;
  49                 havebatt = 1;
  50         } else if (batflags & SONYPI_BFLAGS_B2) {
  51                 /* Not quite right, if there is a second battery I should
  52                  * probably merge the two somehow.. */
  53                 if (!sonypi_ioctl(SONYPI_IOCGBAT2CAP, &cap))
  54                         return 1;
  55                 if (!sonypi_ioctl(SONYPI_IOCGBAT2REM, &rem))
  56                         return 1;
  57                 havebatt = 1;
  58         } else {
  59                 info->battery_percentage = 0;
  60                 info->battery_status = BATTERY_STATUS_ABSENT;
  61         }
  62
  63         if (havebatt) {
  64                 info->battery_percentage = 100 * rem / cap;
  65                 /* Guess at whether the battery is charging. */
  66                 if (info->battery_percentage < 99 && info->ac_line_status == 1) {
  67                         info->battery_flags = info->battery_flags | BATTERY_FLAGS_CHARGING;
  68                         info->battery_status = BATTERY_STATUS_CHARGING;
  69                 }
  70         }
  71
  72         /* Sadly, there is no way to estimate this. */
  73         info->battery_time = 0;
  74
  75         return 0;
  76 }