Atlas - SDL_syspower.c
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
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_internal.h"
22
23// uses BeOS euc.jp apm driver.
24// !!! FIXME: does this thing even work on Haiku?
25
26#ifndef SDL_POWER_DISABLED
27#ifdef SDL_POWER_HAIKU
28
29#include <stdio.h>
30#include <stdlib.h>
31#include <unistd.h>
32#include <fcntl.h>
33#include <ctype.h>
34#include <drivers/Drivers.h>
35
36// These values are from apm.h ...
37#define APM_DEVICE_PATH           "/dev/misc/apm"
38#define APM_FUNC_OFFSET           0x5300
39#define APM_FUNC_GET_POWER_STATUS 10
40#define APM_DEVICE_ALL            1
41#define APM_BIOS_CALL             (B_DEVICE_OP_CODES_END + 3)
42
43bool SDL_GetPowerInfo_Haiku(SDL_PowerState *state, int *seconds, int *percent)
44{
45    const int fd = open("/dev/misc/apm", O_RDONLY | O_CLOEXEC);
46    bool need_details = 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 false; // maybe some other method will work?
57    }
58
59    SDL_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 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 = true;
97    } else if (ac_status == 1) {
98        *state = SDL_POWERSTATE_CHARGED; // on AC, not charging.
99        need_details = true;
100    } else {
101        *state = SDL_POWERSTATE_ON_BATTERY; // not on AC.
102        need_details = 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 true; // the definitive answer if APM driver replied.
120}
121
122#endif // SDL_POWER_HAIKU
123#endif // SDL_POWER_DISABLED
124
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