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annotate src/power/linux/SDL_syspower.c @ 3186:51750b7a966f

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 10 Jun 2009 13:34:20 +0000
parents c8b9c6d27476
children 790cbbda6429
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 <sys/types.h>
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31 #include <sys/stat.h>
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32 #include <fcntl.h>
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33
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34 #include "SDL_power.h"
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35
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36 SDL_bool
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37 SDL_GetPowerInfo_Linux_sys_power(SDL_PowerState * state,
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38 int *seconds, int *percent)
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39 {
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40 return SDL_FALSE; /* !!! FIXME: write me. */
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41 #if 0
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42 const int fd = open("/sys/power", O_RDONLY);
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43 if (fd == -1) {
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44 return SDL_FALSE; /* can't use this interface. */
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45 }
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46 return SDL_TRUE;
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47 #endif
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48 }
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49
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50 SDL_bool
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51 SDL_GetPowerInfo_Linux_proc_acpi(SDL_PowerState * state,
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52 int *seconds, int *percent)
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53 {
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54 return SDL_FALSE; /* !!! FIXME: write me. */
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55 #if 0
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56 const int fd = open("/proc/acpi", O_RDONLY);
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57 if (fd == -1) {
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58 return SDL_FALSE; /* can't use this interface. */
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59 }
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60 return SDL_TRUE;
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61 #endif
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62 }
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63
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64 static SDL_bool
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65 next_string(char **_ptr, char **_str)
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66 {
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67 char *ptr = *_ptr;
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68 char *str = *_str;
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69
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70 while (*ptr == ' ') { /* skip any spaces... */
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71 ptr++;
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72 }
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73
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74 if (*ptr == '\0') {
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75 return SDL_FALSE;
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76 }
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77
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78 str = ptr;
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79 while ((*ptr != ' ') && (*ptr != '\0'))
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80 ptr++;
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81
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82 if (*ptr != '\0')
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83 *(ptr++) = '\0';
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84
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85 *_str = str;
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86 *_ptr = ptr;
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87 return SDL_TRUE;
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88 }
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89
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90 static SDL_bool
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91 int_string(char *str, int *val)
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92 {
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93 char *endptr = NULL;
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94 *val = (int) strtol(str + 2, &endptr, 16);
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95 return ((*str != '\0') && (*endptr == '\0'));
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96 }
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97
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98 /* http://lxr.linux.no/linux+v2.6.29/drivers/char/apm-emulation.c */
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99 SDL_bool
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100 SDL_GetPowerInfo_Linux_proc_apm(SDL_PowerState * state,
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101 int *seconds, int *percent)
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102 {
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103 SDL_bool need_details = SDL_FALSE;
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104 int ac_status = 0;
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105 int battery_status = 0;
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106 int battery_flag = 0;
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107 int battery_percent = 0;
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108 int battery_time = 0;
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109 const int fd = open("/proc/apm", O_RDONLY);
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110 char buf[128];
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111 char *ptr = &buf[0];
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112 char *str = NULL;
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113 ssize_t br;
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114
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115 if (fd == -1) {
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116 return SDL_FALSE; /* can't use this interface. */
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117 }
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118
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119 br = read(fd, buf, sizeof(buf) - 1);
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120 close(fd);
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121
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122 if (br < 0) {
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123 return SDL_FALSE;
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124 }
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125
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126 buf[br] = '\0'; // null-terminate the string.
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127 if (!next_string(&ptr, &str)) { /* driver version */
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128 return SDL_FALSE;
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129 }
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130 if (!next_string(&ptr, &str)) { /* BIOS version */
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131 return SDL_FALSE;
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132 }
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133 if (!next_string(&ptr, &str)) { /* APM flags */
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134 return SDL_FALSE;
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135 }
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136
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137 if (!next_string(&ptr, &str)) { /* AC line status */
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138 return SDL_FALSE;
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139 } else if (!int_string(str, &ac_status)) {
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140 return SDL_FALSE;
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141 }
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142
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143 if (!next_string(&ptr, &str)) { /* battery status */
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144 return SDL_FALSE;
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145 } else if (!int_string(str, &battery_status)) {
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146 return SDL_FALSE;
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147 }
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148 if (!next_string(&ptr, &str)) { /* battery flag */
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149 return SDL_FALSE;
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150 } else if (!int_string(str, &battery_flag)) {
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151 return SDL_FALSE;
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152 }
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153 if (!next_string(&ptr, &str)) { /* remaining battery life percent */
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154 return SDL_FALSE;
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155 }
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156 if (str[strlen(str) - 1] == '%') {
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157 str[strlen(str) - 1] = '\0';
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158 }
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159 if (!int_string(str, &battery_percent)) {
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160 return SDL_FALSE;
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161 }
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162
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163 if (!next_string(&ptr, &str)) { /* remaining battery life time */
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164 return SDL_FALSE;
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165 } else if (!int_string(str, &battery_time)) {
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166 return SDL_FALSE;
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167 }
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168
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169 if (!next_string(&ptr, &str)) { /* remaining battery life time units */
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170 return SDL_FALSE;
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171 } else if (strcmp(str, "min") == 0) {
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172 battery_time *= 60;
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173 }
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174
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175 if (battery_flag == 0xFF) { /* unknown state */
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176 *state = SDL_POWERSTATE_UNKNOWN;
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177 } else if (battery_flag & (1 << 7)) { /* no battery */
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178 *state = SDL_POWERSTATE_NO_BATTERY;
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179 } else if (battery_flag & (1 << 3)) { /* charging */
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180 *state = SDL_POWERSTATE_CHARGING;
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181 need_details = SDL_TRUE;
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182 } else if (ac_status == 1) {
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183 *state = SDL_POWERSTATE_CHARGED; /* on AC, not charging. */
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184 need_details = SDL_TRUE;
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185 } else {
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186 *state = SDL_POWERSTATE_ON_BATTERY;
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187 need_details = SDL_TRUE;
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188 }
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189
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190 *percent = -1;
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191 *seconds = -1;
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192 if (need_details) {
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193 const int pct = battery_percent;
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194 const int secs = battery_time;
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195
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196 if (pct >= 0) { /* -1 == unknown */
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197 *percent = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
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198 }
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199 if (secs >= 0) { /* -1 == unknown */
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200 *seconds = secs;
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201 }
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202 }
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203
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204 return SDL_TRUE;
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205 }
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206
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207 #endif /* SDL_POWER_LINUX */
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208 #endif /* SDL_POWER_DISABLED */
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209
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210 /* vi: set ts=4 sw=4 expandtab: */