Mercurial > backlight
annotate main.c @ 3:7174d183e592
misc: update copyrights
author | David Demelier <markand@malikania.fr> |
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date | Tue, 02 Jan 2018 13:22:22 +0100 |
parents | a81001c9e45a |
children | ecda5dd72b79 |
rev | line source |
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0 | 1 /* |
2 * main.c -- adjust laptop backlight using ACPI | |
3 * | |
3
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misc: update copyrights
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4 * Copyright (c) 2010-2018 David Demelier <markand@malikania.fr> |
0 | 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 <stdio.h> | |
20 #include <stdlib.h> | |
21 #include <string.h> | |
22 | |
23 enum { | |
24 Up, | |
25 Down | |
26 }; | |
27 | |
28 static void | |
29 usage(const char *name) | |
30 { | |
31 fprintf(stderr, "usage: %s down\n", name); | |
32 fprintf(stderr, " %s up\n", name); | |
33 exit(1); | |
34 } | |
35 | |
36 /* {{{ Support for FreeBSD */ | |
37 | |
38 #ifdef __FreeBSD__ | |
39 # include <sys/types.h> | |
40 # include <sys/sysctl.h> | |
41 | |
42 static int | |
43 set(int type) | |
44 { | |
45 int current, next, i; | |
46 int msg[100]; | |
47 size_t len, nextlen; | |
48 | |
49 /* First, get all values availables */ | |
50 len = sizeof (msg); | |
51 | |
52 if (sysctlbyname("hw.acpi.video.lcd0.levels", msg, &len, NULL, 0) == -1) { | |
53 perror("sysctl"); | |
54 return -1; | |
55 } | |
56 | |
57 /* Get the current value */ | |
58 len = sizeof (current); | |
59 | |
60 if (sysctlbyname("hw.acpi.video.lcd0.brightness", ¤t, &len, NULL, 0) == -1) { | |
61 perror("sysctl"); | |
62 return -1; | |
63 } | |
64 | |
65 /* First find the index of 0 */ | |
66 for (i = 0; msg[i] != 0; ++i) | |
67 continue; | |
68 | |
69 /* Find the current value index in msg */ | |
70 for (; msg[i] != current; ++i) | |
71 continue; | |
72 | |
73 if (type == Up) { | |
74 if (msg[i] >= 100) | |
75 return msg[i]; | |
76 | |
77 next = msg[i + 1]; | |
78 } else { | |
79 if (msg[i] == 0) | |
80 return (0); | |
81 | |
82 next = msg[i - 1]; | |
83 } | |
84 | |
85 nextlen = sizeof (next); | |
86 | |
87 if (sysctlbyname("hw.acpi.video.lcd0.brightness", ¤t, &len, &next, nextlen) == -1) { | |
88 perror("sysctl"); | |
89 return -1; | |
90 } | |
91 | |
92 return next; | |
93 } | |
94 | |
95 #endif | |
96 | |
97 /* }}} */ | |
98 | |
99 /* {{{ Support for Linux */ | |
100 | |
101 #ifdef __linux__ | |
102 | |
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103 #include <sys/types.h> |
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104 #include <sys/stat.h> |
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105 |
0 | 106 static int |
107 read_int(const char *path) | |
108 { | |
109 FILE *fp; | |
110 int value; | |
111 | |
112 if ((fp = fopen(path, "r")) == NULL) { | |
113 perror("open"); | |
114 return -1; | |
115 } | |
116 | |
117 if (fscanf(fp, "%d", &value) != 1) | |
118 value = -1; | |
119 fclose(fp); | |
120 | |
121 return value; | |
122 } | |
123 | |
124 static int | |
125 write_int(const char *path, int value) | |
126 { | |
127 FILE *fp; | |
128 | |
129 if ((fp = fopen(path, "w+")) == NULL) { | |
130 perror("open"); | |
131 return -1; | |
132 } | |
133 | |
134 fprintf(fp, "%d", value); | |
135 | |
136 return value; | |
137 } | |
138 | |
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139 const char * |
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140 find_card(void) |
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141 { |
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142 static const char *list[] = { |
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143 "/sys/class/backlight/acpi_video0", |
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144 "/sys/class/backlight/intel_backlight", |
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145 NULL |
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146 }; |
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147 |
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148 struct stat st; |
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149 |
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150 for (const char **ptr = list; *ptr != NULL; ++ptr) |
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151 if (stat(*ptr, &st) >= 0) |
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152 return *ptr; |
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153 |
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154 return NULL; |
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155 } |
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156 |
0 | 157 static int |
158 set(int type) | |
159 { | |
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160 int current, max; |
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161 const char *card = find_card(); |
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162 char file[BUFSIZ]; |
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163 |
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164 /* Find a card adaptor */ |
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165 if (!card) { |
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166 fprintf(stderr, "could not find card adaptor\n"); |
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167 return -1; |
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168 } |
0 | 169 |
170 /* Read actual */ | |
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171 snprintf(file, sizeof (file), "%s/actual_brightness", card); |
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172 current = read_int(file); |
0 | 173 if (current < 0) |
174 return -1; | |
175 | |
176 /* Read max */ | |
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177 snprintf(file, sizeof (file), "%s/max_brightness", card); |
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178 max = read_int(file); |
0 | 179 if (max < 0) |
180 return -1; | |
181 | |
182 if (type == Up) { | |
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183 current += max / 100; |
0 | 184 |
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185 if (current > max) |
0 | 186 return max; |
187 } else { | |
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188 current -= max / 100; |
0 | 189 |
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190 if (current < 0) |
0 | 191 return 0; |
192 } | |
193 | |
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194 snprintf(file, sizeof (file), "%s/brightness", card); |
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195 |
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196 return write_int(file, current); |
0 | 197 } |
198 | |
199 #else | |
200 | |
201 #include <errno.h> | |
202 | |
203 /* Not supported */ | |
204 static int | |
205 set(int type) | |
206 { | |
207 (void)type; | |
208 | |
209 fprintf(stderr, "backlight is not supported on this system"); | |
210 exit(1); | |
211 } | |
212 | |
213 #endif | |
214 | |
215 /* }}} */ | |
216 | |
217 int | |
218 main(int argc, char *argv[]) | |
219 { | |
220 int st, type; | |
221 | |
222 if (argc < 2) | |
223 usage(argv[0]); | |
224 | |
225 if (strcmp(argv[1], "up") == 0) | |
226 type = Up; | |
227 else if (strcmp(argv[1], "down") == 0) | |
228 type = Down; | |
229 else | |
230 usage(argv[0]); | |
231 | |
232 if ((st = set(type)) < 0) { | |
233 printf("failed to set brightness to %d\n", st); | |
234 return 1; | |
235 } | |
236 | |
237 printf("switching to %d\n", st); | |
238 | |
239 return 0; | |
240 } | |
241 | |
242 |