led.c revision 219951
1121941Sphk/*- 2121941Sphk * ---------------------------------------------------------------------------- 3121941Sphk * "THE BEER-WARE LICENSE" (Revision 42): 4121941Sphk * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you 5121941Sphk * can do whatever you want with this stuff. If we meet some day, and you think 6121941Sphk * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp 7121941Sphk * ---------------------------------------------------------------------------- 8121941Sphk * 9121941Sphk */ 10121941Sphk 11121941Sphk#include <sys/cdefs.h> 12121941Sphk__FBSDID("$FreeBSD: head/sys/dev/led/led.c 219951 2011-03-24 08:56:12Z mav $"); 13121941Sphk 14121941Sphk#include <sys/param.h> 15121941Sphk#include <sys/conf.h> 16121941Sphk#include <sys/kernel.h> 17121941Sphk#include <sys/systm.h> 18179413Sed#include <sys/limits.h> 19121941Sphk#include <sys/malloc.h> 20121941Sphk#include <sys/ctype.h> 21121941Sphk#include <sys/sbuf.h> 22121941Sphk#include <sys/queue.h> 23121941Sphk#include <dev/led/led.h> 24121941Sphk#include <sys/uio.h> 25140966Sphk#include <sys/sx.h> 26121941Sphk 27121941Sphkstruct ledsc { 28121941Sphk LIST_ENTRY(ledsc) list; 29219951Smav char *name; 30121941Sphk void *private; 31140966Sphk int unit; 32121941Sphk led_t *func; 33130585Sphk struct cdev *dev; 34121941Sphk struct sbuf *spec; 35121941Sphk char *str; 36121941Sphk char *ptr; 37121941Sphk int count; 38140966Sphk time_t last_second; 39121941Sphk}; 40121941Sphk 41140966Sphkstatic struct unrhdr *led_unit; 42121941Sphkstatic struct mtx led_mtx; 43140966Sphkstatic struct sx led_sx; 44201145Santoinestatic LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(led_list); 45140966Sphkstatic struct callout led_ch; 46121941Sphk 47141616Sphkstatic MALLOC_DEFINE(M_LED, "LED", "LED driver"); 48121941Sphk 49121941Sphkstatic void 50121941Sphkled_timeout(void *p) 51121941Sphk{ 52121941Sphk struct ledsc *sc; 53121941Sphk 54121941Sphk mtx_lock(&led_mtx); 55121941Sphk LIST_FOREACH(sc, &led_list, list) { 56121941Sphk if (sc->ptr == NULL) 57121941Sphk continue; 58121941Sphk if (sc->count > 0) { 59121941Sphk sc->count--; 60121941Sphk continue; 61121941Sphk } 62128678Sphk if (*sc->ptr == '.') { 63128678Sphk sc->ptr = NULL; 64128678Sphk continue; 65140966Sphk } else if (*sc->ptr == 'U' || *sc->ptr == 'u') { 66140966Sphk if (sc->last_second == time_second) 67140966Sphk continue; 68140966Sphk sc->last_second = time_second; 69140966Sphk sc->func(sc->private, *sc->ptr == 'U'); 70128678Sphk } else if (*sc->ptr >= 'a' && *sc->ptr <= 'j') { 71123494Sphk sc->func(sc->private, 0); 72140966Sphk sc->count = (*sc->ptr & 0xf) - 1; 73128678Sphk } else if (*sc->ptr >= 'A' && *sc->ptr <= 'J') { 74123494Sphk sc->func(sc->private, 1); 75140966Sphk sc->count = (*sc->ptr & 0xf) - 1; 76128678Sphk } 77123494Sphk sc->ptr++; 78123494Sphk if (*sc->ptr == '\0') 79121941Sphk sc->ptr = sc->str; 80121941Sphk } 81121941Sphk mtx_unlock(&led_mtx); 82140966Sphk callout_reset(&led_ch, hz / 10, led_timeout, p); 83121941Sphk return; 84121941Sphk} 85121941Sphk 86121941Sphkstatic int 87219951Smavled_state(struct ledsc *sc, struct sbuf **sb, int state) 88140966Sphk{ 89140966Sphk struct sbuf *sb2 = NULL; 90140966Sphk 91219951Smav sb2 = sc->spec; 92219951Smav sc->spec = *sb; 93219951Smav if (*sb != NULL) { 94219951Smav sc->str = sbuf_data(*sb); 95219951Smav sc->ptr = sc->str; 96219951Smav } else { 97219951Smav sc->str = NULL; 98219951Smav sc->ptr = NULL; 99219951Smav sc->func(sc->private, state); 100140966Sphk } 101219951Smav sc->count = 0; 102219951Smav *sb = sb2; 103140966Sphk return(0); 104140966Sphk} 105140966Sphk 106140966Sphkstatic int 107219951Smavled_parse(const char *s, struct sbuf **sb, int *state) 108121941Sphk{ 109219951Smav int i, error; 110121941Sphk 111121941Sphk /* 112121941Sphk * Handle "on" and "off" immediately so people can flash really 113121941Sphk * fast from userland if they want to 114121941Sphk */ 115121941Sphk if (*s == '0' || *s == '1') { 116219951Smav *state = *s & 1; 117219951Smav return (0); 118121941Sphk } 119121941Sphk 120219951Smav *state = 0; 121219951Smav *sb = sbuf_new_auto(); 122219951Smav if (*sb == NULL) 123121941Sphk return (ENOMEM); 124121941Sphk switch(s[0]) { 125121941Sphk /* 126121941Sphk * Flash, default is 100msec/100msec. 127121941Sphk * 'f2' sets 200msec/200msec etc. 128121941Sphk */ 129121941Sphk case 'f': 130121941Sphk if (s[1] >= '1' && s[1] <= '9') 131121941Sphk i = s[1] - '1'; 132121941Sphk else 133121941Sphk i = 0; 134219951Smav sbuf_printf(*sb, "%c%c", 'A' + i, 'a' + i); 135121941Sphk break; 136121941Sphk /* 137121941Sphk * Digits, flashes out numbers. 138121941Sphk * 'd12' becomes -__________-_-______________________________ 139121941Sphk */ 140121941Sphk case 'd': 141121941Sphk for(s++; *s; s++) { 142121941Sphk if (!isdigit(*s)) 143121941Sphk continue; 144121941Sphk i = *s - '0'; 145121941Sphk if (i == 0) 146121941Sphk i = 10; 147121941Sphk for (; i > 1; i--) 148219951Smav sbuf_cat(*sb, "Aa"); 149219951Smav sbuf_cat(*sb, "Aj"); 150121941Sphk } 151219951Smav sbuf_cat(*sb, "jj"); 152121941Sphk break; 153121941Sphk /* 154121941Sphk * String, roll your own. 155123014Sphk * 'a-j' gives "off" for n/10 sec. 156123014Sphk * 'A-J' gives "on" for n/10 sec. 157121941Sphk * no delay before repeat 158121941Sphk * 'sAaAbBa' becomes _-_--__- 159121941Sphk */ 160121941Sphk case 's': 161121941Sphk for(s++; *s; s++) { 162128678Sphk if ((*s >= 'a' && *s <= 'j') || 163128678Sphk (*s >= 'A' && *s <= 'J') || 164140966Sphk *s == 'U' || *s <= 'u' || 165128678Sphk *s == '.') 166219951Smav sbuf_bcat(*sb, s, 1); 167121941Sphk } 168121941Sphk break; 169121941Sphk /* 170121941Sphk * Morse. 171121941Sphk * '.' becomes _- 172121941Sphk * '-' becomes _--- 173121941Sphk * ' ' becomes __ 174121941Sphk * '\n' becomes ____ 175121941Sphk * 1sec pause between repeats 176121941Sphk * '... --- ...' -> _-_-_-___---_---_---___-_-_-__________ 177121941Sphk */ 178121941Sphk case 'm': 179121941Sphk for(s++; *s; s++) { 180121941Sphk if (*s == '.') 181219951Smav sbuf_cat(*sb, "aA"); 182121941Sphk else if (*s == '-') 183219951Smav sbuf_cat(*sb, "aC"); 184121941Sphk else if (*s == ' ') 185219951Smav sbuf_cat(*sb, "b"); 186121956Sphk else if (*s == '\n') 187219951Smav sbuf_cat(*sb, "d"); 188121941Sphk } 189219951Smav sbuf_cat(*sb, "j"); 190121941Sphk break; 191121941Sphk default: 192219951Smav sbuf_delete(*sb); 193123494Sphk return (EINVAL); 194121941Sphk } 195219951Smav error = sbuf_finish(*sb); 196219951Smav if (error != 0 || sbuf_len(*sb) == 0) { 197219951Smav *sb = NULL; 198212371Smdf return (error); 199121941Sphk } 200219951Smav return (0); 201219951Smav} 202121941Sphk 203219951Smavstatic int 204219951Smavled_write(struct cdev *dev, struct uio *uio, int ioflag) 205219951Smav{ 206219951Smav struct ledsc *sc; 207219951Smav char *s; 208219951Smav struct sbuf *sb = NULL; 209219951Smav int error, state = 0; 210219951Smav 211219951Smav if (uio->uio_resid > 512) 212219951Smav return (EINVAL); 213219951Smav s = malloc(uio->uio_resid + 1, M_DEVBUF, M_WAITOK); 214219951Smav s[uio->uio_resid] = '\0'; 215219951Smav error = uiomove(s, uio->uio_resid, uio); 216219951Smav if (error) { 217219951Smav free(s, M_DEVBUF); 218219951Smav return (error); 219219951Smav } 220219951Smav error = led_parse(s, &sb, &state); 221219951Smav free(s, M_DEVBUF); 222219951Smav if (error) 223219951Smav return (error); 224219951Smav mtx_lock(&led_mtx); 225219951Smav sc = dev->si_drv1; 226219951Smav if (sc != NULL) 227219951Smav error = led_state(sc, &sb, state); 228219951Smav mtx_unlock(&led_mtx); 229219951Smav if (sb != NULL) 230219951Smav sbuf_delete(sb); 231219951Smav return (error); 232121941Sphk} 233121941Sphk 234219951Smavint 235219951Smavled_set(char const *name, char const *cmd) 236219951Smav{ 237219951Smav struct ledsc *sc; 238219951Smav struct sbuf *sb = NULL; 239219951Smav int error, state = 0; 240219951Smav 241219951Smav error = led_parse(cmd, &sb, &state); 242219951Smav if (error) 243219951Smav return (error); 244219951Smav mtx_lock(&led_mtx); 245219951Smav LIST_FOREACH(sc, &led_list, list) { 246219951Smav if (strcmp(sc->name, name) == 0) 247219951Smav break; 248219951Smav } 249219951Smav if (sc != NULL) 250219951Smav error = led_state(sc, &sb, state); 251219951Smav else 252219951Smav error = ENOENT; 253219951Smav mtx_unlock(&led_mtx); 254219951Smav if (sb != NULL) 255219951Smav sbuf_delete(sb); 256219951Smav return (0); 257219951Smav} 258219951Smav 259121941Sphkstatic struct cdevsw led_cdevsw = { 260126080Sphk .d_version = D_VERSION, 261125810Sphk .d_write = led_write, 262125810Sphk .d_name = "LED", 263121941Sphk}; 264121941Sphk 265130585Sphkstruct cdev * 266121941Sphkled_create(led_t *func, void *priv, char const *name) 267121941Sphk{ 268168974Sphk 269168974Sphk return (led_create_state(func, priv, name, 0)); 270168974Sphk} 271168974Sphkstruct cdev * 272168974Sphkled_create_state(led_t *func, void *priv, char const *name, int state) 273168974Sphk{ 274121941Sphk struct ledsc *sc; 275121941Sphk 276140966Sphk sc = malloc(sizeof *sc, M_LED, M_WAITOK | M_ZERO); 277121941Sphk 278140966Sphk sx_xlock(&led_sx); 279219951Smav sc->name = strdup(name, M_LED); 280140966Sphk sc->unit = alloc_unr(led_unit); 281121941Sphk sc->private = priv; 282121941Sphk sc->func = func; 283183381Sed sc->dev = make_dev(&led_cdevsw, sc->unit, 284140966Sphk UID_ROOT, GID_WHEEL, 0600, "led/%s", name); 285140966Sphk sx_xunlock(&led_sx); 286140966Sphk 287140966Sphk mtx_lock(&led_mtx); 288121941Sphk sc->dev->si_drv1 = sc; 289140966Sphk if (LIST_EMPTY(&led_list)) 290140966Sphk callout_reset(&led_ch, hz / 10, led_timeout, NULL); 291121941Sphk LIST_INSERT_HEAD(&led_list, sc, list); 292168974Sphk sc->func(sc->private, state != 0); 293121941Sphk mtx_unlock(&led_mtx); 294140966Sphk 295121941Sphk return (sc->dev); 296121941Sphk} 297121941Sphk 298121941Sphkvoid 299130585Sphkled_destroy(struct cdev *dev) 300121941Sphk{ 301121941Sphk struct ledsc *sc; 302121941Sphk 303140966Sphk mtx_lock(&led_mtx); 304121941Sphk sc = dev->si_drv1; 305140966Sphk dev->si_drv1 = NULL; 306140966Sphk 307121941Sphk LIST_REMOVE(sc, list); 308140966Sphk if (LIST_EMPTY(&led_list)) 309140966Sphk callout_stop(&led_ch); 310121941Sphk mtx_unlock(&led_mtx); 311140966Sphk 312140966Sphk sx_xlock(&led_sx); 313140966Sphk free_unr(led_unit, sc->unit); 314140966Sphk destroy_dev(dev); 315122963Sphk if (sc->spec != NULL) 316122963Sphk sbuf_delete(sc->spec); 317219951Smav free(sc->name, M_LED); 318121941Sphk free(sc, M_LED); 319140966Sphk sx_xunlock(&led_sx); 320121941Sphk} 321140966Sphk 322140966Sphkstatic void 323140966Sphkled_drvinit(void *unused) 324140966Sphk{ 325140966Sphk 326179413Sed led_unit = new_unrhdr(0, INT_MAX, NULL); 327140966Sphk mtx_init(&led_mtx, "LED mtx", NULL, MTX_DEF); 328140966Sphk sx_init(&led_sx, "LED sx"); 329140966Sphk callout_init(&led_ch, CALLOUT_MPSAFE); 330140966Sphk} 331140966Sphk 332140966SphkSYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL); 333