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annotate src/power/linux/SDL_syspower.c @ 3170:b7a48f533966

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Initial work on power subsystem for SDL 1.3.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 07 Jun 2009 06:06:35 +0000
parents
children c8b9c6d27476
rev   line source
3170
b7a48f533966 Initial work on power subsystem for SDL 1.3.
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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_LINUX
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26
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27 #include <stdio.h>
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28 #include <unistd.h>
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29
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30 #include "SDL_power.h"
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31
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32 SDL_bool
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33 SDL_GetPowerInfo_Linux_sys_power(SDL_PowerState *state,
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34 int *seconds, int *percent)
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35 {
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36 return SDL_FALSE; /* !!! FIXME: write me. */
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37 #if 0
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38 const int fd = open("/sys/power", O_RDONLY);
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39 if (fd == -1) {
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40 return SDL_FALSE; /* can't use this interface. */
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41 }
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42 return SDL_TRUE;
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43 #endif
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44 }
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45
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46 SDL_bool
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47 SDL_GetPowerInfo_Linux_sys_proc_acpi(SDL_PowerState *state,
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48 int *seconds, int *percent)
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49 {
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50 return SDL_FALSE; /* !!! FIXME: write me. */
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51 #if 0
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52 const int fd = open("/proc/acpi", O_RDONLY);
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53 if (fd == -1) {
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54 return SDL_FALSE; /* can't use this interface. */
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55 }
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56 return SDL_TRUE;
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57 #endif
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58 }
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59
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60 static SDL_bool
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61 next_string(char **_ptr, char **_str)
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62 {
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63 char *ptr = *_ptr;
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64 char *str = *_str;
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65
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66 while (*ptr == ' ') { /* skip any spaces... */
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67 ptr++;
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68 }
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69
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70 if (*ptr == '\0') {
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71 return SDL_FALSE;
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72 }
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73
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74 str = ptr;
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75 while ((*ptr != ' ') && (*ptr != '\0'))
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76 ptr++;
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77
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78 if (*ptr != '\0')
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79 *(ptr++) = '\0';
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80
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81 *_str = str;
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82 *_ptr = ptr;
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83 return SDL_TRUE;
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84 }
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85
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86 static SDL_bool
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87 int_string(char *str, int *val)
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88 {
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89 char *endptr = NULL;
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90 *val = (int) strtol(str+2, &endptr, 16);
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91 return ((*str != '\0') && (*endptr == '\0'));
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92 }
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93
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94 /* http://lxr.linux.no/linux+v2.6.29/drivers/char/apm-emulation.c */
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95 SDL_bool
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96 SDL_GetPowerInfo_Linux_sys_proc_apm(SDL_PowerState *state,
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97 int *seconds, int *percent)
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98 {
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99 SDL_bool need_details = SDL_FALSE;
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100 int ac_status = 0;
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101 int battery_status = 0;
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102 int battery_flag = 0;
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103 int battery_percent = 0;
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104 int battery_time = 0;
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105 const int fd = open("/proc/apm", O_RDONLY);
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106 char buf[128];
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107 char *ptr = &buf[0];
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108 char *str = NULL;
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109 ssize_t br;
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110
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111 if (fd == -1) {
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112 return SDL_FALSE; /* can't use this interface. */
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113 }
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114
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115 br = read(fd, buf, sizeof (buf) - 1);
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116 close(fd);
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117
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118 if (br < 0) {
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119 return SDL_FALSE;
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120 }
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121
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122 buf[br] = '\0'; // null-terminate the string.
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123 if (!next_string(&ptr, &str)) { /* driver version */
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124 return SDL_FALSE;
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125 }
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126 if (!next_string(&ptr, &str)) { /* BIOS version */
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127 return SDL_FALSE;
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128 }
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129 if (!next_string(&ptr, &str)) { /* APM flags */
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130 return SDL_FALSE;
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131 }
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132
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133 if (!next_string(&ptr, &str)) { /* AC line status */
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134 return SDL_FALSE;
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135 } else if (!int_string(str, &ac_status)) {
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136 return SDL_FALSE;
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137 }
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138
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139 if (!next_string(&ptr, &str)) { /* battery status */
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140 return SDL_FALSE;
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141 } else if (!int_string(str, &battery_status)) {
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142 return SDL_FALSE;
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143 }
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144 if (!next_string(&ptr, &str)) { /* battery flag */
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145 return SDL_FALSE;
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146 } else if (!int_string(str, &battery_flag)) {
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147 return SDL_FALSE;
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148 }
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149 if (!next_string(&ptr, &str)) { /* remaining battery life percent */
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150 return SDL_FALSE;
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151 }
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152 if (str[strlen(str) - 1] == '%') {
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153 str[strlen(str) - 1] = '\0';
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154 }
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155 if (!int_string(str, &battery_percent)) {
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156 return SDL_FALSE;
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157 }
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158
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159 if (!next_string(&ptr, &str)) { /* remaining battery life time */
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160 return SDL_FALSE;
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161 } else if (!int_string(str, &battery_time)) {
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162 return SDL_FALSE;
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163 }
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164
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165 if (!next_string(&ptr, &str)) { /* remaining battery life time units */
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166 return SDL_FALSE;
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167 } else if (strcmp(str, "min") == 0) {
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168 battery_time *= 60;
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169 }
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170
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171 if (battery_flag == 0xFF) { /* unknown state */
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172 *state = SDL_POWERSTATE_UNKNOWN;
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173 } else if (battery_flag & (1 << 7)) { /* no battery */
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174 *state = SDL_POWERSTATE_NO_BATTERY;
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175 } else if (battery_flag & (1 << 3)) { /* charging */
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176 *state = SDL_POWERSTATE_CHARGING;
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177 need_details = SDL_TRUE;
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178 } else if (ac_status == 1) {
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179 *state = SDL_POWERSTATE_CHARGED; /* on AC, not charging. */
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180 need_details = SDL_TRUE;
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181 } else {
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182 *state = SDL_POWERSTATE_ON_BATTERY;
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183 need_details = SDL_TRUE;
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184 }
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185
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186 *percent = -1;
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187 *seconds = -1;
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188 if (need_details) {
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189 const int pct = battery_percent;
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190 const int secs = battery_time;
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191
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192 if (pct >= 0) { /* -1 == unknown */
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193 *percent = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
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194 }
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195 if (secs >= 0) { /* -1 == unknown */
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196 *seconds = secs;
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197 }
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198 }
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199
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200 return SDL_TRUE;
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201 }
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202
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203 #endif /* SDL_POWER_LINUX */
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204 #endif /* SDL_POWER_DISABLED */
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205
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206 /* vi: set ts=4 sw=4 expandtab: */
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207