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annotate src/power/beos/SDL_syspower.c @ 4903:f50c7996d925

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Documentation clarification
author Sam Lantinga <slouken@libsdl.org>
date Wed, 29 Sep 2010 21:24:50 -0700
parents f7b03b6838cb
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifndef SDL_POWER_DISABLED
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25 #ifdef SDL_POWER_BEOS
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26
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27 #include <stdio.h>
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28 #include <stdlib.h>
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29 #include <unistd.h>
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30 #include <fcntl.h>
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31 #include <ctype.h>
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32 #include <drivers/Drivers.h>
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33
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34 /* These values are from apm.h ... */
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35 #define APM_DEVICE_PATH "/dev/misc/apm"
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36 #define APM_FUNC_OFFSET 0x5300
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37 #define APM_FUNC_GET_POWER_STATUS 10
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38 #define APM_DEVICE_ALL 1
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39 #define APM_BIOS_CALL (B_DEVICE_OP_CODES_END + 3)
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40
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41 #include "SDL_power.h"
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42
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43 SDL_bool
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44 SDL_GetPowerInfo_BeOS(SDL_PowerState * state, int *seconds, int *percent)
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45 {
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46 const int fd = open("/dev/misc/apm", O_RDONLY);
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47 SDL_bool need_details = SDL_FALSE;
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48 uint16 regs[6];
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49 uint8 ac_status;
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50 uint8 battery_status;
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51 uint8 battery_flags;
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52 uint8 battery_life;
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53 uint32 battery_time;
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54
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55 if (fd == -1) {
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56 return SDL_FALSE; /* maybe some other method will work? */
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57 }
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58
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59 memset(regs, '\0', sizeof(regs));
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60 regs[0] = APM_FUNC_OFFSET + APM_FUNC_GET_POWER_STATUS;
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61 regs[1] = APM_DEVICE_ALL;
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62 rc = ioctl(fd, APM_BIOS_CALL, regs);
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63 close(fd);
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64
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65 if (rc < 0) {
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66 return SDL_FALSE;
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67 }
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68
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69 ac_status = regs[1] >> 8;
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70 battery_status = regs[1] & 0xFF;
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71 battery_flags = regs[2] >> 8;
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72 battery_life = regs[2] & 0xFF;
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73 battery_time = (uint32) regs[3];
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74
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75 /* in theory, _something_ should be set in battery_flags, right? */
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76 if (battery_flags == 0x00) { /* older APM BIOS? Less fields. */
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77 battery_time = 0xFFFF;
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78 if (battery_status == 0xFF) {
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79 battery_flags = 0xFF;
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80 } else {
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81 battery_flags = (1 << status.battery_status);
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82 }
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83 }
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84
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85 if ((battery_time != 0xFFFF) && (battery_time & (1 << 15))) {
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86 /* time is in minutes, not seconds */
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87 battery_time = (battery_time & 0x7FFF) * 60;
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88 }
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89
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90 if (battery_flags == 0xFF) { /* unknown state */
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91 *state = SDL_POWERSTATE_UNKNOWN;
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92 } else if (battery_flags & (1 << 7)) { /* no battery */
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93 *state = SDL_POWERSTATE_NO_BATTERY;
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94 } else if (battery_flags & (1 << 3)) { /* charging */
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95 *state = SDL_POWERSTATE_CHARGING;
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96 need_details = SDL_TRUE;
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97 } else if (ac_status == 1) {
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98 *state = SDL_POWERSTATE_CHARGED; /* on AC, not charging. */
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99 need_details = SDL_TRUE;
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100 } else {
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101 *state = SDL_POWERSTATE_ON_BATTERY; /* not on AC. */
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102 need_details = SDL_TRUE;
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103 }
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104
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105 *percent = -1;
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106 *seconds = -1;
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107 if (need_details) {
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108 const int pct = (int) battery_life;
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109 const int secs = (int) battery_time;
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110
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111 if (pct != 255) { /* 255 == unknown */
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112 *percent = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
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113 }
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114 if (secs != 0xFFFF) { /* 0xFFFF == unknown */
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115 *seconds = secs;
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116 }
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117 }
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118
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119 return SDL_TRUE; /* the definitive answer if APM driver replied. */
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120 }
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121
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122 #endif /* SDL_POWER_BEOS */
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123 #endif /* SDL_POWER_DISABLED */
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124
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125 /* vi: set ts=4 sw=4 expandtab: */