| 1 | /* |
| 2 | * configurable RSSI LED control daemon for OpenWrt |
| 3 | * (c) 2012 Allnet GmbH, Daniel Golle <dgolle@allnet.de> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | * |
| 19 | * The author may be reached as dgolle@allnet.de, or |
| 20 | * ALLNET GmbH |
| 21 | * Maistr. 2 |
| 22 | * D-82110 Germering |
| 23 | * Germany |
| 24 | * |
| 25 | */ |
| 26 | |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <sys/stat.h> |
| 30 | #include <fcntl.h> |
| 31 | #include <signal.h> |
| 32 | #include <unistd.h> |
| 33 | #include <syslog.h> |
| 34 | |
| 35 | #include "iwinfo.h" |
| 36 | |
| 37 | #define RUN_DIR "/var/run" |
| 38 | #define LEDS_BASEPATH "/sys/class/leds/" |
| 39 | #define BACKEND_RETRY_DELAY 500000 |
| 40 | |
| 41 | char *ifname; |
| 42 | int qual_max; |
| 43 | |
| 44 | struct led { |
| 45 | char *sysfspath; |
| 46 | FILE *controlfd; |
| 47 | unsigned char state; |
| 48 | }; |
| 49 | |
| 50 | typedef struct rule rule_t; |
| 51 | struct rule { |
| 52 | struct led *led; |
| 53 | int minq; |
| 54 | int maxq; |
| 55 | int boffset; |
| 56 | int bfactor; |
| 57 | rule_t *next; |
| 58 | }; |
| 59 | |
| 60 | void log_rules(rule_t *rules) |
| 61 | { |
| 62 | rule_t *rule = rules; |
| 63 | while (rule) |
| 64 | { |
| 65 | syslog(LOG_INFO, " %s r: %d..%d, o: %d, f: %d\n", |
| 66 | rule->led->sysfspath, |
| 67 | rule->minq, rule->maxq, |
| 68 | rule->boffset, rule->bfactor); |
| 69 | rule = rule->next; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | int set_led(struct led *led, unsigned char value) |
| 74 | { |
| 75 | char buf[8]; |
| 76 | |
| 77 | if ( ! led ) |
| 78 | return -1; |
| 79 | |
| 80 | if ( ! led->controlfd ) |
| 81 | return -1; |
| 82 | |
| 83 | if ( led->state == value ) |
| 84 | return 0; |
| 85 | |
| 86 | snprintf(buf, 8, "%d", value); |
| 87 | |
| 88 | rewind(led->controlfd); |
| 89 | |
| 90 | if ( ! fwrite(buf, sizeof(char), strlen(buf), led->controlfd) ) |
| 91 | return -2; |
| 92 | |
| 93 | fflush(led->controlfd); |
| 94 | led->state=value; |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | int init_led(struct led **led, char *ledname) |
| 100 | { |
| 101 | struct led *newled; |
| 102 | struct stat statbuffer; |
| 103 | int status; |
| 104 | char *bp; |
| 105 | FILE *bfp; |
| 106 | |
| 107 | bp = calloc(sizeof(char), strlen(ledname) + strlen(LEDS_BASEPATH) + 12); |
| 108 | if ( ! bp ) |
| 109 | goto return_error; |
| 110 | |
| 111 | sprintf(bp, "%s%s/brightness", LEDS_BASEPATH, ledname); |
| 112 | |
| 113 | status = stat(bp, &statbuffer); |
| 114 | if ( status ) |
| 115 | goto cleanup_fname; |
| 116 | |
| 117 | bfp = fopen( bp, "w" ); |
| 118 | if ( !bfp ) |
| 119 | goto cleanup_fname; |
| 120 | |
| 121 | if ( ferror(bfp) ) |
| 122 | goto cleanup_fp; |
| 123 | |
| 124 | /* sysfs path exists and, allocate LED struct */ |
| 125 | newled = calloc(sizeof(struct led),1); |
| 126 | if ( !newled ) |
| 127 | goto cleanup_fp; |
| 128 | |
| 129 | newled->sysfspath = bp; |
| 130 | newled->controlfd = bfp; |
| 131 | |
| 132 | *led = newled; |
| 133 | |
| 134 | if ( set_led(newled, 255) ) |
| 135 | goto cleanup_fp; |
| 136 | |
| 137 | if ( set_led(newled, 0) ) |
| 138 | goto cleanup_fp; |
| 139 | |
| 140 | return 0; |
| 141 | |
| 142 | cleanup_fp: |
| 143 | fclose(bfp); |
| 144 | cleanup_fname: |
| 145 | free(bp); |
| 146 | return_error: |
| 147 | syslog(LOG_CRIT, "can't open LED %s\n", ledname); |
| 148 | *led = NULL; |
| 149 | return -1; |
| 150 | } |
| 151 | |
| 152 | void close_led(struct led **led) |
| 153 | { |
| 154 | fclose((*led)->controlfd); |
| 155 | free((*led)->sysfspath); |
| 156 | free((*led)); |
| 157 | (*led)=NULL; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | int quality(const struct iwinfo_ops *iw, const char *ifname) |
| 162 | { |
| 163 | int qual; |
| 164 | |
| 165 | if ( ! iw ) return -1; |
| 166 | |
| 167 | if (qual_max < 1) |
| 168 | if (iw->quality_max(ifname, &qual_max)) |
| 169 | return -1; |
| 170 | |
| 171 | if (iw->quality(ifname, &qual)) |
| 172 | return -1; |
| 173 | |
| 174 | return ( qual * 100 ) / qual_max ; |
| 175 | } |
| 176 | |
| 177 | int open_backend(const struct iwinfo_ops **iw, const char *ifname) |
| 178 | { |
| 179 | *iw = iwinfo_backend(ifname); |
| 180 | |
| 181 | if (!(*iw)) |
| 182 | return 1; |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | void update_leds(rule_t *rules, int q) |
| 188 | { |
| 189 | rule_t *rule = rules; |
| 190 | while (rule) |
| 191 | { |
| 192 | int b; |
| 193 | /* offset and factore correction according to rule */ |
| 194 | b = ( q + rule->boffset ) * rule->bfactor; |
| 195 | if ( b < 0 ) |
| 196 | b=0; |
| 197 | if ( b > 255 ) |
| 198 | b=255; |
| 199 | |
| 200 | if ( q >= rule->minq && q <= rule->maxq ) |
| 201 | set_led(rule->led, (unsigned char)b); |
| 202 | else |
| 203 | set_led(rule->led, 0); |
| 204 | |
| 205 | rule = rule->next; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | int main(int argc, char **argv) |
| 210 | { |
| 211 | int i,q,q0,r,s; |
| 212 | const struct iwinfo_ops *iw = NULL; |
| 213 | rule_t *headrule = NULL, *currentrule = NULL; |
| 214 | |
| 215 | if (argc < 9 || ( (argc-4) % 5 != 0 ) ) |
| 216 | { |
| 217 | printf("syntax: %s (ifname) (refresh) (threshold) (rule) [rule] ...\n", argv[0]); |
| 218 | printf(" rule: (sysfs-name) (minq) (maxq) (offset) (factore)\n"); |
| 219 | return 1; |
| 220 | } |
| 221 | |
| 222 | ifname = argv[1]; |
| 223 | |
| 224 | /* refresh interval */ |
| 225 | if ( sscanf(argv[2], "%d", &r) != 1 ) |
| 226 | return 1; |
| 227 | |
| 228 | /* sustain threshold */ |
| 229 | if ( sscanf(argv[3], "%d", &s) != 1 ) |
| 230 | return 1; |
| 231 | |
| 232 | openlog("rssileds", LOG_PID, LOG_DAEMON); |
| 233 | syslog(LOG_INFO, "monitoring %s, refresh rate %d, threshold %d\n", ifname, r, s); |
| 234 | |
| 235 | currentrule = headrule; |
| 236 | for (i=4; i<argc; i=i+5) { |
| 237 | if (! currentrule) |
| 238 | { |
| 239 | /* first element in the list */ |
| 240 | currentrule = calloc(sizeof(rule_t),1); |
| 241 | headrule = currentrule; |
| 242 | } |
| 243 | else |
| 244 | { |
| 245 | /* follow-up element */ |
| 246 | currentrule->next = calloc(sizeof(rule_t),1); |
| 247 | currentrule = currentrule->next; |
| 248 | } |
| 249 | |
| 250 | if ( init_led(&(currentrule->led), argv[i]) ) |
| 251 | return 1; |
| 252 | |
| 253 | if ( sscanf(argv[i+1], "%d", &(currentrule->minq)) != 1 ) |
| 254 | return 1; |
| 255 | |
| 256 | if ( sscanf(argv[i+2], "%d", &(currentrule->maxq)) != 1 ) |
| 257 | return 1; |
| 258 | |
| 259 | if ( sscanf(argv[i+3], "%d", &(currentrule->boffset)) != 1 ) |
| 260 | return 1; |
| 261 | |
| 262 | if ( sscanf(argv[i+4], "%d", &(currentrule->bfactor)) != 1 ) |
| 263 | return 1; |
| 264 | } |
| 265 | log_rules(headrule); |
| 266 | |
| 267 | q0 = -1; |
| 268 | do { |
| 269 | q = quality(iw, ifname); |
| 270 | if ( q < q0 - s || q > q0 + s ) { |
| 271 | update_leds(headrule, q); |
| 272 | q0=q; |
| 273 | }; |
| 274 | // re-open backend... |
| 275 | if ( q == -1 && q0 == -1 ) { |
| 276 | if (iw) { |
| 277 | iwinfo_finish(); |
| 278 | iw=NULL; |
| 279 | usleep(BACKEND_RETRY_DELAY); |
| 280 | } |
| 281 | while (open_backend(&iw, ifname)) |
| 282 | usleep(BACKEND_RETRY_DELAY); |
| 283 | } |
| 284 | usleep(r); |
| 285 | } while(1); |
| 286 | |
| 287 | iwinfo_finish(); |
| 288 | |
| 289 | return 0; |
| 290 | } |
| 291 | |
