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
   8 #include "sonypi.h"
   9
  10 signed int spicfd = -1;
  11
  12 int sonypi_supported (void) {
  13         if ((spicfd = open("/dev/sonypi", O_RDWR)) == -1)
  14                 return 0;
  15         else
  16                 return 1;
  17 }
  18
  19 inline int sonypi_ioctl(int ioctlno, void *param) {
  20         if (ioctl(spicfd, ioctlno, param) < 0)
  21                 return 0;
  22         else
  23                 return 1;
  24 }
  25
  26 /* Read battery info from sonypi device and shove it into an apm_info
  27  * struct. */
  28 int sonypi_read (apm_info *info) {
  29         __u8 batflags;
  30         __u16 cap, rem;
  31         int havebatt = 0;
  32
  33         info->using_minutes = info->battery_flags = 0;
  34
  35         if (! sonypi_ioctl(SONYPI_IOCGBATFLAGS, &batflags)) {
  36                 return 1;
  37         }
  38
  39         info->ac_line_status = (batflags & SONYPI_BFLAGS_AC) != 0;
  40         if (batflags & SONYPI_BFLAGS_B1) {
  41                 if (! sonypi_ioctl(SONYPI_IOCGBAT1CAP, &cap))
  42                         return 1;
  43                 if (! sonypi_ioctl(SONYPI_IOCGBAT1REM, &rem))
  44                         return 1;
  45                 havebatt = 1;
  46         }
  47         else if (batflags & SONYPI_BFLAGS_B2) {
  48                 /* Not quite right, if there is a second battery I should
  49                  * probably merge the two somehow.. */
  50                 if (! sonypi_ioctl(SONYPI_IOCGBAT2CAP, &cap))
  51                         return 1;
  52                 if (! sonypi_ioctl(SONYPI_IOCGBAT2REM, &rem))
  53                         return 1;
  54                 havebatt = 1;
  55         }
  56         else {
  57                 info->battery_percentage = 0;
  58                 info->battery_status = BATTERY_STATUS_ABSENT;
  59         }
  60
  61         if (havebatt) {
  62                 info->battery_percentage = 100 * rem / cap;
  63                 /* Guess at whether the battery is charging. */
  64                 if (info->battery_percentage < 99 && info->ac_line_status == 1) {
  65                         info->battery_flags = info->battery_flags | BATTERY_FLAGS_CHARGING;
  66                         info->battery_status = BATTERY_STATUS_CHARGING;
  67                 }
  68         }
  69
  70         /* Sadly, there is no way to estimate this. */
  71         info->battery_time = 0;
  72
  73         return 0;
  74 }