led.c revision 183381
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 183381 2008-09-26 14:19:52Z ed $"); 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; 29121941Sphk void *private; 30140966Sphk int unit; 31121941Sphk led_t *func; 32130585Sphk struct cdev *dev; 33121941Sphk struct sbuf *spec; 34121941Sphk char *str; 35121941Sphk char *ptr; 36121941Sphk int count; 37140966Sphk time_t last_second; 38121941Sphk}; 39121941Sphk 40140966Sphkstatic struct unrhdr *led_unit; 41121941Sphkstatic struct mtx led_mtx; 42140966Sphkstatic struct sx led_sx; 43121941Sphkstatic LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(&led_list); 44140966Sphkstatic struct callout led_ch; 45121941Sphk 46141616Sphkstatic MALLOC_DEFINE(M_LED, "LED", "LED driver"); 47121941Sphk 48121941Sphkstatic void 49121941Sphkled_timeout(void *p) 50121941Sphk{ 51121941Sphk struct ledsc *sc; 52121941Sphk 53121941Sphk mtx_lock(&led_mtx); 54121941Sphk LIST_FOREACH(sc, &led_list, list) { 55121941Sphk if (sc->ptr == NULL) 56121941Sphk continue; 57121941Sphk if (sc->count > 0) { 58121941Sphk sc->count--; 59121941Sphk continue; 60121941Sphk } 61128678Sphk if (*sc->ptr == '.') { 62128678Sphk sc->ptr = NULL; 63128678Sphk continue; 64140966Sphk } else if (*sc->ptr == 'U' || *sc->ptr == 'u') { 65140966Sphk if (sc->last_second == time_second) 66140966Sphk continue; 67140966Sphk sc->last_second = time_second; 68140966Sphk sc->func(sc->private, *sc->ptr == 'U'); 69128678Sphk } else if (*sc->ptr >= 'a' && *sc->ptr <= 'j') { 70123494Sphk sc->func(sc->private, 0); 71140966Sphk sc->count = (*sc->ptr & 0xf) - 1; 72128678Sphk } else if (*sc->ptr >= 'A' && *sc->ptr <= 'J') { 73123494Sphk sc->func(sc->private, 1); 74140966Sphk sc->count = (*sc->ptr & 0xf) - 1; 75128678Sphk } 76123494Sphk sc->ptr++; 77123494Sphk if (*sc->ptr == '\0') 78121941Sphk sc->ptr = sc->str; 79121941Sphk } 80121941Sphk mtx_unlock(&led_mtx); 81140966Sphk callout_reset(&led_ch, hz / 10, led_timeout, p); 82121941Sphk return; 83121941Sphk} 84121941Sphk 85121941Sphkstatic int 86140966Sphkled_state(struct cdev *dev, struct sbuf *sb, int state) 87140966Sphk{ 88140966Sphk struct sbuf *sb2 = NULL; 89140966Sphk struct ledsc *sc; 90140966Sphk 91140966Sphk mtx_lock(&led_mtx); 92140966Sphk sc = dev->si_drv1; 93140966Sphk if (sc != NULL) { 94140966Sphk sb2 = sc->spec; 95140966Sphk sc->spec = sb; 96140966Sphk if (sb != NULL) { 97140966Sphk sc->str = sbuf_data(sb); 98140966Sphk sc->ptr = sc->str; 99140966Sphk } else { 100140966Sphk sc->str = NULL; 101140966Sphk sc->ptr = NULL; 102140966Sphk sc->func(sc->private, state); 103140966Sphk } 104140966Sphk sc->count = 0; 105140966Sphk } 106140966Sphk mtx_unlock(&led_mtx); 107140966Sphk if (sb2 != NULL) 108140966Sphk sbuf_delete(sb2); 109140966Sphk if (sc == NULL) 110140966Sphk return (ENXIO); 111140966Sphk return(0); 112140966Sphk} 113140966Sphk 114140966Sphkstatic int 115130585Sphkled_write(struct cdev *dev, struct uio *uio, int ioflag) 116121941Sphk{ 117121941Sphk int error; 118123494Sphk char *s, *s2; 119140966Sphk struct sbuf *sb = NULL; 120121941Sphk int i; 121121941Sphk 122140966Sphk if (dev->si_drv1 == NULL) 123140966Sphk return (ENXIO); 124121941Sphk 125121941Sphk if (uio->uio_resid > 512) 126121941Sphk return (EINVAL); 127123494Sphk s2 = s = malloc(uio->uio_resid + 1, M_DEVBUF, M_WAITOK); 128121941Sphk s[uio->uio_resid] = '\0'; 129121941Sphk error = uiomove(s, uio->uio_resid, uio); 130121941Sphk if (error) { 131123494Sphk free(s2, M_DEVBUF); 132121941Sphk return (error); 133121941Sphk } 134121941Sphk 135121941Sphk /* 136121941Sphk * Handle "on" and "off" immediately so people can flash really 137121941Sphk * fast from userland if they want to 138121941Sphk */ 139121941Sphk if (*s == '0' || *s == '1') { 140140966Sphk error = led_state(dev, NULL, *s & 1); 141123494Sphk free(s2, M_DEVBUF); 142140966Sphk return(error); 143121941Sphk } 144121941Sphk 145181463Sdes sb = sbuf_new_auto(); 146121941Sphk if (sb == NULL) { 147123494Sphk free(s2, M_DEVBUF); 148121941Sphk return (ENOMEM); 149121941Sphk } 150121941Sphk 151121941Sphk switch(s[0]) { 152121941Sphk /* 153121941Sphk * Flash, default is 100msec/100msec. 154121941Sphk * 'f2' sets 200msec/200msec etc. 155121941Sphk */ 156121941Sphk case 'f': 157121941Sphk if (s[1] >= '1' && s[1] <= '9') 158121941Sphk i = s[1] - '1'; 159121941Sphk else 160121941Sphk i = 0; 161123014Sphk sbuf_printf(sb, "%c%c", 'A' + i, 'a' + i); 162121941Sphk break; 163121941Sphk /* 164121941Sphk * Digits, flashes out numbers. 165121941Sphk * 'd12' becomes -__________-_-______________________________ 166121941Sphk */ 167121941Sphk case 'd': 168121941Sphk for(s++; *s; s++) { 169121941Sphk if (!isdigit(*s)) 170121941Sphk continue; 171121941Sphk i = *s - '0'; 172121941Sphk if (i == 0) 173121941Sphk i = 10; 174121941Sphk for (; i > 1; i--) 175123014Sphk sbuf_cat(sb, "Aa"); 176123014Sphk sbuf_cat(sb, "Aj"); 177121941Sphk } 178123014Sphk sbuf_cat(sb, "jj"); 179121941Sphk break; 180121941Sphk /* 181121941Sphk * String, roll your own. 182123014Sphk * 'a-j' gives "off" for n/10 sec. 183123014Sphk * 'A-J' gives "on" for n/10 sec. 184121941Sphk * no delay before repeat 185121941Sphk * 'sAaAbBa' becomes _-_--__- 186121941Sphk */ 187121941Sphk case 's': 188121941Sphk for(s++; *s; s++) { 189128678Sphk if ((*s >= 'a' && *s <= 'j') || 190128678Sphk (*s >= 'A' && *s <= 'J') || 191140966Sphk *s == 'U' || *s <= 'u' || 192128678Sphk *s == '.') 193128678Sphk sbuf_bcat(sb, s, 1); 194121941Sphk } 195121941Sphk break; 196121941Sphk /* 197121941Sphk * Morse. 198121941Sphk * '.' becomes _- 199121941Sphk * '-' becomes _--- 200121941Sphk * ' ' becomes __ 201121941Sphk * '\n' becomes ____ 202121941Sphk * 1sec pause between repeats 203121941Sphk * '... --- ...' -> _-_-_-___---_---_---___-_-_-__________ 204121941Sphk */ 205121941Sphk case 'm': 206121941Sphk for(s++; *s; s++) { 207121941Sphk if (*s == '.') 208123014Sphk sbuf_cat(sb, "aA"); 209121941Sphk else if (*s == '-') 210123014Sphk sbuf_cat(sb, "aC"); 211121941Sphk else if (*s == ' ') 212123014Sphk sbuf_cat(sb, "b"); 213121956Sphk else if (*s == '\n') 214123014Sphk sbuf_cat(sb, "d"); 215121941Sphk } 216123014Sphk sbuf_cat(sb, "j"); 217121941Sphk break; 218121941Sphk default: 219123494Sphk sbuf_delete(sb); 220123494Sphk free(s2, M_DEVBUF); 221123494Sphk return (EINVAL); 222121941Sphk } 223121941Sphk sbuf_finish(sb); 224123494Sphk free(s2, M_DEVBUF); 225121941Sphk if (sbuf_overflowed(sb)) { 226121941Sphk sbuf_delete(sb); 227121941Sphk return (ENOMEM); 228121941Sphk } 229121941Sphk if (sbuf_len(sb) == 0) { 230121941Sphk sbuf_delete(sb); 231121941Sphk return (0); 232121941Sphk } 233121941Sphk 234140966Sphk return (led_state(dev, sb, 0)); 235121941Sphk} 236121941Sphk 237121941Sphkstatic struct cdevsw led_cdevsw = { 238126080Sphk .d_version = D_VERSION, 239125810Sphk .d_write = led_write, 240125810Sphk .d_name = "LED", 241121941Sphk}; 242121941Sphk 243130585Sphkstruct cdev * 244121941Sphkled_create(led_t *func, void *priv, char const *name) 245121941Sphk{ 246168974Sphk 247168974Sphk return (led_create_state(func, priv, name, 0)); 248168974Sphk} 249168974Sphkstruct cdev * 250168974Sphkled_create_state(led_t *func, void *priv, char const *name, int state) 251168974Sphk{ 252121941Sphk struct ledsc *sc; 253121941Sphk 254140966Sphk sc = malloc(sizeof *sc, M_LED, M_WAITOK | M_ZERO); 255121941Sphk 256140966Sphk sx_xlock(&led_sx); 257140966Sphk sc->unit = alloc_unr(led_unit); 258121941Sphk sc->private = priv; 259121941Sphk sc->func = func; 260183381Sed sc->dev = make_dev(&led_cdevsw, sc->unit, 261140966Sphk UID_ROOT, GID_WHEEL, 0600, "led/%s", name); 262140966Sphk sx_xunlock(&led_sx); 263140966Sphk 264140966Sphk mtx_lock(&led_mtx); 265121941Sphk sc->dev->si_drv1 = sc; 266140966Sphk if (LIST_EMPTY(&led_list)) 267140966Sphk callout_reset(&led_ch, hz / 10, led_timeout, NULL); 268121941Sphk LIST_INSERT_HEAD(&led_list, sc, list); 269168974Sphk sc->func(sc->private, state != 0); 270121941Sphk mtx_unlock(&led_mtx); 271140966Sphk 272121941Sphk return (sc->dev); 273121941Sphk} 274121941Sphk 275121941Sphkvoid 276130585Sphkled_destroy(struct cdev *dev) 277121941Sphk{ 278121941Sphk struct ledsc *sc; 279121941Sphk 280140966Sphk mtx_lock(&led_mtx); 281121941Sphk sc = dev->si_drv1; 282140966Sphk dev->si_drv1 = NULL; 283140966Sphk 284121941Sphk LIST_REMOVE(sc, list); 285140966Sphk if (LIST_EMPTY(&led_list)) 286140966Sphk callout_stop(&led_ch); 287121941Sphk mtx_unlock(&led_mtx); 288140966Sphk 289140966Sphk sx_xlock(&led_sx); 290140966Sphk free_unr(led_unit, sc->unit); 291140966Sphk destroy_dev(dev); 292122963Sphk if (sc->spec != NULL) 293122963Sphk sbuf_delete(sc->spec); 294121941Sphk free(sc, M_LED); 295140966Sphk sx_xunlock(&led_sx); 296121941Sphk} 297140966Sphk 298140966Sphkstatic void 299140966Sphkled_drvinit(void *unused) 300140966Sphk{ 301140966Sphk 302179413Sed led_unit = new_unrhdr(0, INT_MAX, NULL); 303140966Sphk mtx_init(&led_mtx, "LED mtx", NULL, MTX_DEF); 304140966Sphk sx_init(&led_sx, "LED sx"); 305140966Sphk callout_init(&led_ch, CALLOUT_MPSAFE); 306140966Sphk} 307140966Sphk 308140966SphkSYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL); 309