Mercurial > backlight
annotate backlight.c @ 19:0de3886f98ad
misc: minor updates
author | David Demelier <markand@malikania.fr> |
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date | Wed, 29 Jan 2020 13:09:21 +0100 |
parents | 281cc3a22f1b |
children | bf880b3c0665 |
rev | line source |
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7 | 1 /* |
2 * main.c -- adjust laptop backlight using ACPI | |
3 * | |
19 | 4 * Copyright (c) 2010-2020 David Demelier <markand@malikania.fr> |
7 | 5 * |
6 * Permission to use, copy, modify, and distribute this software for any | |
7 * purpose with or without fee is hereby granted, provided that the above | |
8 * copyright notice and this permission notice appear in all copies. | |
9 * | |
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
17 */ | |
18 | |
19 #include <errno.h> | |
20 #include <stdarg.h> | |
21 #include <stdio.h> | |
22 #include <stdlib.h> | |
23 #include <string.h> | |
24 | |
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25 /* |
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26 * Functions to implement for your system: |
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27 * |
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28 * All of these functions are allowed to exit on failures. |
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29 */ |
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30 |
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31 /* Set the level explicitly to the nearest value */ |
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32 static void |
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33 set(unsigned int); |
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34 |
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35 /* Get the current value */ |
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36 static unsigned int |
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37 get(void); |
7 | 38 |
39 static void | |
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40 increase(void) |
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41 { |
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42 unsigned int value = get(); |
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43 |
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44 if (value + 2 > 100) |
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45 value = 100; |
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46 else |
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47 value += 2; |
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48 |
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49 set(value); |
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50 } |
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51 |
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52 static void |
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53 decrease(void) |
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54 { |
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55 unsigned int value = get(); |
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56 |
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57 if ((int)value - 2 < 0) |
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58 value = 0; |
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59 else |
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60 value -= 2; |
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61 |
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62 set(value); |
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63 } |
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64 |
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65 |
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66 static void |
7 | 67 usage(const char *name) |
68 { | |
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69 fprintf(stderr, "usage: %s decrease\n", name); |
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70 fprintf(stderr, " %s get\n", name); |
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71 fprintf(stderr, " %s increase\n", name); |
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72 fprintf(stderr, " %s set percentage\n", name); |
7 | 73 exit(1); |
74 } | |
75 | |
76 static void | |
77 die(const char *fmt, ...) | |
78 { | |
79 va_list ap; | |
80 | |
81 va_start(ap, fmt); | |
82 fprintf(stderr, "abort: "); | |
83 vfprintf(stderr, fmt, ap); | |
84 va_end(ap); | |
85 | |
86 exit(1); | |
87 } | |
88 | |
89 /* {{{ Support for FreeBSD */ | |
90 | |
91 #if defined(__FreeBSD__) | |
92 | |
93 #include <sys/types.h> | |
94 #include <sys/sysctl.h> | |
95 | |
96 static int | |
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97 upper_bound(int *levels, size_t length, unsigned int percent) |
7 | 98 { |
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99 size_t low = 0; |
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100 size_t high = length - 1; |
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101 |
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102 while (low < high) { |
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103 size_t mid = (low + high) / 2; |
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104 |
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105 if (percent <= (unsigned)levels[mid]) |
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106 high = mid; |
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107 else |
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108 low = mid + 1; |
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109 } |
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110 |
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111 return low; |
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112 } |
7 | 113 |
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114 static int |
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115 min(const void *v1, const void *v2) |
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116 { |
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117 return *(int *)v1 - *(int *)v2; |
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118 } |
7 | 119 |
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120 static void |
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121 sort(int *tab, size_t size) |
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122 { |
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123 qsort(tab, size, sizeof (int), min); |
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124 } |
7 | 125 |
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126 static void |
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127 set(unsigned int percent) |
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128 { |
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129 int levels[200] = {0}; |
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130 size_t length = sizeof (levels); |
7 | 131 |
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132 if (sysctlbyname("hw.acpi.video.lcd0.levels", levels, &length, NULL, 0) < 0) |
7 | 133 die("sysctl: %s\n", strerror(errno)); |
134 | |
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135 length /= sizeof (int); |
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136 |
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137 /* Find appropriate nearest level */ |
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138 if (percent > 0 && percent < 100) { |
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139 sort(levels, length); |
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140 percent = levels[upper_bound(levels, length, percent)]; |
7 | 141 } |
142 | |
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143 if (sysctlbyname("hw.acpi.video.lcd0.brightness", NULL, NULL, |
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144 &percent, sizeof (int)) < 0) |
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145 die("sysctl: %s\n", strerror(errno)); |
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146 |
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147 } |
7 | 148 |
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149 static unsigned int |
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150 get(void) |
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151 { |
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152 int current = 0; |
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153 size_t length = sizeof (int); |
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154 |
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155 if (sysctlbyname("hw.acpi.video.lcd0.brightness", ¤t, &length, NULL, 0) == -1) |
7 | 156 die("sysctl: %s\n", strerror(errno)); |
157 | |
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158 return current; |
7 | 159 } |
160 | |
161 /* }}} */ | |
162 | |
163 /* {{{ Support for Linux */ | |
164 | |
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165 #elif defined(__linux__) |
7 | 166 |
167 #include <sys/types.h> | |
168 #include <sys/stat.h> | |
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169 #include <dirent.h> |
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170 #include <fcntl.h> |
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171 #include <unistd.h> |
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172 |
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173 #define SYS_PATH "/sys/class/backlight" |
7 | 174 |
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175 static unsigned int |
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176 read_int(int dfd, const char *file) |
7 | 177 { |
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178 char buf[32] = {0}; |
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179 int fd; |
7 | 180 |
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181 if ((fd = openat(dfd, file, O_RDONLY)) < 0) |
7 | 182 die("open: %s\n", strerror(errno)); |
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183 if (read(fd, &buf[0], sizeof (buf) - 1) < 0) |
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184 die("read: %s\n", strerror(errno)); |
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185 |
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186 close(fd); |
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187 |
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188 return atoi(buf); |
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189 } |
7 | 190 |
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191 static int |
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192 write_int(int dfd, const char *file, unsigned int value) |
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193 { |
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194 char buf[32] = {0}; |
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195 int length; |
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196 int fd; |
7 | 197 |
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198 if ((fd = openat(dfd, file, O_WRONLY)) < 0) |
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199 die("open: %s\n", strerror(errno)); |
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200 if ((length = snprintf(buf, sizeof (buf), "%d\n", value)) < 0) |
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201 die("snprintf: %s\n", strerror(errno)); |
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202 if (write(fd, buf, length) != length) |
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203 die("write: %s\n", strerror(errno)); |
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204 |
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205 /* Re-read in case kernel change the value. */ |
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206 return read_int(dfd, "brightness"); |
7 | 207 } |
208 | |
209 static int | |
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210 try_adaptor(int parent_fd, const char *path) |
7 | 211 { |
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212 int dfd; |
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213 struct stat st; |
7 | 214 |
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215 if ((dfd = openat(parent_fd, path, O_RDONLY)) < 0) |
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216 return -1; |
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217 if (fstatat(dfd, "brightness", &st, 0) < 0) { |
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218 close(dfd); |
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219 return -1; |
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220 } |
7 | 221 |
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222 return dfd; |
7 | 223 } |
224 | |
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225 static int |
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226 find_adaptor(void) |
7 | 227 { |
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228 int dfd, adaptorfd = -1; |
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229 DIR *dirp; |
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230 struct dirent *dirent; |
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231 |
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232 if ((dfd = open(SYS_PATH, O_RDONLY)) < 0) |
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233 die("open: %s: %s\n", SYS_PATH, strerror(errno)); |
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234 if (!(dirp = fdopendir(dfd))) |
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235 die("fdopendir: %s: %s\n", SYS_PATH, strerror(errno)); |
7 | 236 |
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237 while ((dirent = readdir(dirp))) { |
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238 if (strcmp(dirent->d_name, ".") == 0 || |
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239 strcmp(dirent->d_name, "..") == 0) |
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240 continue; |
7 | 241 |
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242 if ((adaptorfd = try_adaptor(dfd, dirent->d_name)) >= 0) |
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243 break; |
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244 } |
7 | 245 |
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246 closedir(dirp); |
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247 close(dfd); |
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248 |
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249 if (adaptorfd < 0) |
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250 die("could not find card adaptor\n"); |
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251 |
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252 return adaptorfd; |
7 | 253 } |
254 | |
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255 static unsigned int |
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256 downscale(int dfd, unsigned int value) |
7 | 257 { |
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258 return value * 100 / read_int(dfd, "max_brightness"); |
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259 } |
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260 |
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261 static unsigned int |
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262 upscale(int dfd, unsigned int value) |
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263 { |
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264 return value * read_int(dfd, "max_brightness") / 100; |
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265 } |
7 | 266 |
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267 static void |
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268 set(unsigned int percent) |
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269 { |
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270 int dfd = find_adaptor(); |
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271 unsigned int value = upscale(dfd, percent); |
7 | 272 |
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273 write_int(dfd, "brightness", value); |
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274 } |
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275 |
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276 static unsigned int |
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277 get(void) |
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278 { |
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279 int dfd = find_adaptor(); |
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280 int value = read_int(dfd, "brightness"); |
7 | 281 |
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282 return downscale(dfd, value); |
7 | 283 } |
284 | |
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285 /* }}} */ |
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286 |
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287 /* {{{ Non supported shims */ |
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288 |
7 | 289 #else |
290 | |
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291 static void |
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292 notsupported(void) |
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293 { |
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294 die("backlight is not supported on this system\n"); |
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295 } |
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296 |
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297 static void |
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298 set(unsigned int v) |
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299 { |
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300 (void)v; |
7 | 301 |
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302 notsupported(); |
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303 } |
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304 |
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305 static unsigned int |
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306 get(void) |
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307 { |
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308 notsupported(); |
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309 |
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310 return -1; |
7 | 311 } |
312 | |
313 #endif | |
314 | |
315 /* }}} */ | |
316 | |
317 int | |
318 main(int argc, char *argv[]) | |
319 { | |
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320 -- argc; |
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321 ++ argv; |
7 | 322 |
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323 if (argc < 1) |
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324 usage("backlight"); |
7 | 325 |
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326 if (strcmp(argv[0], "get") == 0) |
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327 printf("%d\n", get()); |
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328 else if (strcmp(argv[0], "set") == 0) { |
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329 if (argc != 2) |
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330 usage(argv[0]); |
7 | 331 |
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332 unsigned int value = atoi(argv[1]); |
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333 |
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334 if (value > 100) |
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335 die("value %u is out of range\n", value); |
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336 |
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337 set(value); |
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338 } else if (strcmp(argv[0], "increase") == 0) |
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339 increase(); |
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340 else if (strcmp(argv[0], "decrease") == 0) |
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341 decrease(); |
7 | 342 } |