1 /*- 2 * ---------------------------------------------------------------------------- 3 * "THE BEER-WARE LICENSE" (Revision 42): 4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 5 * can do whatever you want with this stuff. If we meet some day, and you think 6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7 * ---------------------------------------------------------------------------- 8 * 9 */ 10 11 #include <sys/cdefs.h> 12 __FBSDID("$FreeBSD$"); 13 14 #include <sys/param.h> 15 #include <sys/conf.h> 16 #include <sys/kernel.h> 17 #include <sys/systm.h> 18 #include <sys/limits.h> 19 #include <sys/malloc.h> 20 #include <sys/ctype.h> 21 #include <sys/sbuf.h> 22 #include <sys/queue.h> 23 #include <dev/led/led.h> 24 #include <sys/uio.h> 25 #include <sys/sx.h> 26 27 struct ledsc { 28 LIST_ENTRY(ledsc) list; 29 char *name; 30 void *private; 31 int unit; 32 led_t *func; 33 struct cdev *dev; 34 struct sbuf *spec; 35 char *str; 36 char *ptr; 37 int count; 38 time_t last_second; 39 }; 40 41 static struct unrhdr *led_unit; 42 static struct mtx led_mtx; 43 static struct sx led_sx; 44 static LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(led_list); 45 static struct callout led_ch; 46 static int blinkers = 0; 47 48 static MALLOC_DEFINE(M_LED, "LED", "LED driver"); 49 50 static void 51 led_timeout(void *p) 52 { 53 struct ledsc *sc; 54 55 LIST_FOREACH(sc, &led_list, list) { 56 if (sc->ptr == NULL) 57 continue; 58 if (sc->count > 0) { 59 sc->count--; 60 continue; 61 } 62 if (*sc->ptr == '.') { 63 sc->ptr = NULL; 64 blinkers--; 65 continue; 66 } else if (*sc->ptr == 'U' || *sc->ptr == 'u') { 67 if (sc->last_second == time_second) 68 continue; 69 sc->last_second = time_second; 70 sc->func(sc->private, *sc->ptr == 'U'); 71 } else if (*sc->ptr >= 'a' && *sc->ptr <= 'j') { 72 sc->func(sc->private, 0); 73 sc->count = (*sc->ptr & 0xf) - 1; 74 } else if (*sc->ptr >= 'A' && *sc->ptr <= 'J') { 75 sc->func(sc->private, 1); 76 sc->count = (*sc->ptr & 0xf) - 1; 77 } 78 sc->ptr++; 79 if (*sc->ptr == '\0') 80 sc->ptr = sc->str; 81 } 82 if (blinkers > 0) 83 callout_reset(&led_ch, hz / 10, led_timeout, p); 84 } 85 86 static int 87 led_state(struct ledsc *sc, struct sbuf **sb, int state) 88 { 89 struct sbuf *sb2 = NULL; 90 91 sb2 = sc->spec; 92 sc->spec = *sb; 93 if (*sb != NULL) { 94 sc->str = sbuf_data(*sb); 95 if (sc->ptr == NULL) { 96 blinkers++; 97 callout_reset(&led_ch, hz / 10, led_timeout, NULL); 98 } 99 sc->ptr = sc->str; 100 } else { 101 sc->str = NULL; 102 if (sc->ptr != NULL) 103 blinkers--; 104 sc->ptr = NULL; 105 sc->func(sc->private, state); 106 } 107 sc->count = 0; 108 *sb = sb2; 109 return(0); 110 } 111 112 static int 113 led_parse(const char *s, struct sbuf **sb, int *state) 114 { 115 int i, error; 116 117 /* 118 * Handle "on" and "off" immediately so people can flash really 119 * fast from userland if they want to 120 */ 121 if (*s == '0' || *s == '1') { 122 *state = *s & 1; 123 return (0); 124 } 125 126 *state = 0; 127 *sb = sbuf_new_auto(); 128 if (*sb == NULL) 129 return (ENOMEM); 130 switch(s[0]) { 131 /* 132 * Flash, default is 100msec/100msec. 133 * 'f2' sets 200msec/200msec etc. 134 */ 135 case 'f': 136 if (s[1] >= '1' && s[1] <= '9') 137 i = s[1] - '1'; 138 else 139 i = 0; 140 sbuf_printf(*sb, "%c%c", 'A' + i, 'a' + i); 141 break; 142 /* 143 * Digits, flashes out numbers. 144 * 'd12' becomes -__________-_-______________________________ 145 */ 146 case 'd': 147 for(s++; *s; s++) { 148 if (!isdigit(*s)) 149 continue; 150 i = *s - '0'; 151 if (i == 0) 152 i = 10; 153 for (; i > 1; i--) 154 sbuf_cat(*sb, "Aa"); 155 sbuf_cat(*sb, "Aj"); 156 } 157 sbuf_cat(*sb, "jj"); 158 break; 159 /* 160 * String, roll your own. 161 * 'a-j' gives "off" for n/10 sec. 162 * 'A-J' gives "on" for n/10 sec. 163 * no delay before repeat 164 * 'sAaAbBa' becomes _-_--__- 165 */ 166 case 's': 167 for(s++; *s; s++) { 168 if ((*s >= 'a' && *s <= 'j') || 169 (*s >= 'A' && *s <= 'J') || 170 *s == 'U' || *s <= 'u' || 171 *s == '.') 172 sbuf_bcat(*sb, s, 1); 173 } 174 break; 175 /* 176 * Morse. 177 * '.' becomes _- 178 * '-' becomes _--- 179 * ' ' becomes __ 180 * '\n' becomes ____ 181 * 1sec pause between repeats 182 * '... --- ...' -> _-_-_-___---_---_---___-_-_-__________ 183 */ 184 case 'm': 185 for(s++; *s; s++) { 186 if (*s == '.') 187 sbuf_cat(*sb, "aA"); 188 else if (*s == '-') 189 sbuf_cat(*sb, "aC"); 190 else if (*s == ' ') 191 sbuf_cat(*sb, "b"); 192 else if (*s == '\n') 193 sbuf_cat(*sb, "d"); 194 } 195 sbuf_cat(*sb, "j"); 196 break; 197 default: 198 sbuf_delete(*sb); 199 return (EINVAL); 200 } 201 error = sbuf_finish(*sb); 202 if (error != 0 || sbuf_len(*sb) == 0) { 203 *sb = NULL; 204 return (error); 205 } 206 return (0); 207 } 208 209 static int 210 led_write(struct cdev *dev, struct uio *uio, int ioflag) 211 { 212 struct ledsc *sc; 213 char *s; 214 struct sbuf *sb = NULL; 215 int error, state = 0; 216 217 if (uio->uio_resid > 512) 218 return (EINVAL); 219 s = malloc(uio->uio_resid + 1, M_DEVBUF, M_WAITOK); 220 s[uio->uio_resid] = '\0'; 221 error = uiomove(s, uio->uio_resid, uio); 222 if (error) { 223 free(s, M_DEVBUF); 224 return (error); 225 } 226 error = led_parse(s, &sb, &state); 227 free(s, M_DEVBUF); 228 if (error) 229 return (error); 230 mtx_lock(&led_mtx); 231 sc = dev->si_drv1; 232 if (sc != NULL) 233 error = led_state(sc, &sb, state); 234 mtx_unlock(&led_mtx); 235 if (sb != NULL) 236 sbuf_delete(sb); 237 return (error); 238 } 239 240 int 241 led_set(char const *name, char const *cmd) 242 { 243 struct ledsc *sc; 244 struct sbuf *sb = NULL; 245 int error, state = 0; 246 247 error = led_parse(cmd, &sb, &state); 248 if (error) 249 return (error); 250 mtx_lock(&led_mtx); 251 LIST_FOREACH(sc, &led_list, list) { 252 if (strcmp(sc->name, name) == 0) 253 break; 254 } 255 if (sc != NULL) 256 error = led_state(sc, &sb, state); 257 else 258 error = ENOENT; 259 mtx_unlock(&led_mtx); 260 if (sb != NULL) 261 sbuf_delete(sb); 262 return (0); 263 } 264 265 static struct cdevsw led_cdevsw = { 266 .d_version = D_VERSION, 267 .d_write = led_write, 268 .d_name = "LED", 269 }; 270 271 struct cdev * 272 led_create(led_t *func, void *priv, char const *name) 273 { 274 275 return (led_create_state(func, priv, name, 0)); 276 } 277 struct cdev * 278 led_create_state(led_t *func, void *priv, char const *name, int state) 279 { 280 struct ledsc *sc; 281 282 sc = malloc(sizeof *sc, M_LED, M_WAITOK | M_ZERO); 283 284 sx_xlock(&led_sx); 285 sc->name = strdup(name, M_LED); 286 sc->unit = alloc_unr(led_unit); 287 sc->private = priv; 288 sc->func = func; 289 sc->dev = make_dev(&led_cdevsw, sc->unit, 290 UID_ROOT, GID_WHEEL, 0600, "led/%s", name); 291 sx_xunlock(&led_sx); 292 293 mtx_lock(&led_mtx); 294 sc->dev->si_drv1 = sc; 295 LIST_INSERT_HEAD(&led_list, sc, list); 296 if (state != -1) 297 sc->func(sc->private, state != 0); 298 mtx_unlock(&led_mtx); 299 300 return (sc->dev); 301 } 302 303 void 304 led_destroy(struct cdev *dev) 305 { 306 struct ledsc *sc; 307 308 mtx_lock(&led_mtx); 309 sc = dev->si_drv1; 310 dev->si_drv1 = NULL; 311 if (sc->ptr != NULL) 312 blinkers--; 313 LIST_REMOVE(sc, list); 314 if (LIST_EMPTY(&led_list)) 315 callout_stop(&led_ch); 316 mtx_unlock(&led_mtx); 317 318 sx_xlock(&led_sx); 319 free_unr(led_unit, sc->unit); 320 destroy_dev(dev); 321 if (sc->spec != NULL) 322 sbuf_delete(sc->spec); 323 free(sc->name, M_LED); 324 free(sc, M_LED); 325 sx_xunlock(&led_sx); 326 } 327 328 static void 329 led_drvinit(void *unused) 330 { 331 332 led_unit = new_unrhdr(0, INT_MAX, NULL); 333 mtx_init(&led_mtx, "LED mtx", NULL, MTX_DEF); 334 sx_init(&led_sx, "LED sx"); 335 callout_init_mtx(&led_ch, &led_mtx, 0); 336 } 337 338 SYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL); 339