src/power/beos/SDL_syspower.c
author Sam Lantinga
Sat, 06 Oct 2012 12:16:32 -0700
changeset 6566 dd7e57847ea9
parent 6138 4c64952a58fb
child 6885 700f1b25f77f
permissions -rw-r--r--
Add flags to the vidmode debug output
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "SDL_config.h"
    22 
    23 #ifndef SDL_POWER_DISABLED
    24 #if SDL_POWER_BEOS
    25 
    26 #include <stdio.h>
    27 #include <stdlib.h>
    28 #include <unistd.h>
    29 #include <fcntl.h>
    30 #include <ctype.h>
    31 #include <drivers/Drivers.h>
    32 
    33 /* These values are from apm.h ... */
    34 #define APM_DEVICE_PATH "/dev/misc/apm"
    35 #define APM_FUNC_OFFSET 0x5300
    36 #define APM_FUNC_GET_POWER_STATUS 10
    37 #define APM_DEVICE_ALL 1
    38 #define APM_BIOS_CALL (B_DEVICE_OP_CODES_END + 3)
    39 
    40 #include "SDL_power.h"
    41 
    42 SDL_bool
    43 SDL_GetPowerInfo_BeOS(SDL_PowerState * state, int *seconds, int *percent)
    44 {
    45     const int fd = open("/dev/misc/apm", O_RDONLY);
    46     SDL_bool need_details = SDL_FALSE;
    47     uint16 regs[6];
    48     uint8 ac_status;
    49     uint8 battery_status;
    50     uint8 battery_flags;
    51     uint8 battery_life;
    52     uint32 battery_time;
    53 	int rc;
    54 	
    55     if (fd == -1) {
    56         return SDL_FALSE;       /* maybe some other method will work? */
    57     }
    58 
    59     memset(regs, '\0', sizeof(regs));
    60     regs[0] = APM_FUNC_OFFSET + APM_FUNC_GET_POWER_STATUS;
    61     regs[1] = APM_DEVICE_ALL;
    62     rc = ioctl(fd, APM_BIOS_CALL, regs);
    63     close(fd);
    64 
    65     if (rc < 0) {
    66         return SDL_FALSE;
    67     }
    68 
    69     ac_status = regs[1] >> 8;
    70     battery_status = regs[1] & 0xFF;
    71     battery_flags = regs[2] >> 8;
    72     battery_life = regs[2] & 0xFF;
    73     battery_time = (uint32) regs[3];
    74 
    75     /* in theory, _something_ should be set in battery_flags, right? */
    76     if (battery_flags == 0x00) {        /* older APM BIOS? Less fields. */
    77         battery_time = 0xFFFF;
    78         if (battery_status == 0xFF) {
    79             battery_flags = 0xFF;
    80         } else {
    81             battery_flags = (1 << battery_status);
    82         }
    83     }
    84 
    85     if ((battery_time != 0xFFFF) && (battery_time & (1 << 15))) {
    86         /* time is in minutes, not seconds */
    87         battery_time = (battery_time & 0x7FFF) * 60;
    88     }
    89 
    90     if (battery_flags == 0xFF) {        /* unknown state */
    91         *state = SDL_POWERSTATE_UNKNOWN;
    92     } else if (battery_flags & (1 << 7)) {      /* no battery */
    93         *state = SDL_POWERSTATE_NO_BATTERY;
    94     } else if (battery_flags & (1 << 3)) {      /* charging */
    95         *state = SDL_POWERSTATE_CHARGING;
    96         need_details = SDL_TRUE;
    97     } else if (ac_status == 1) {
    98         *state = SDL_POWERSTATE_CHARGED;        /* on AC, not charging. */
    99         need_details = SDL_TRUE;
   100     } else {
   101         *state = SDL_POWERSTATE_ON_BATTERY;     /* not on AC. */
   102         need_details = SDL_TRUE;
   103     }
   104 
   105     *percent = -1;
   106     *seconds = -1;
   107     if (need_details) {
   108         const int pct = (int) battery_life;
   109         const int secs = (int) battery_time;
   110 
   111         if (pct != 255) {       /* 255 == unknown */
   112             *percent = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
   113         }
   114         if (secs != 0xFFFF) {   /* 0xFFFF == unknown */
   115             *seconds = secs;
   116         }
   117     }
   118 
   119     return SDL_TRUE;            /* the definitive answer if APM driver replied. */
   120 }
   121 
   122 #endif /* SDL_POWER_BEOS */
   123 #endif /* SDL_POWER_DISABLED */
   124 
   125 /* vi: set ts=4 sw=4 expandtab: */