led.c revision 125810
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 125810 2004-02-14 20:03:36Z phk $"); 13121941Sphk 14121941Sphk#include <sys/param.h> 15121941Sphk#include <sys/conf.h> 16121941Sphk#include <sys/kernel.h> 17121941Sphk#include <sys/systm.h> 18121941Sphk#include <sys/malloc.h> 19121941Sphk#include <sys/ctype.h> 20121941Sphk#include <sys/sbuf.h> 21121941Sphk#include <sys/queue.h> 22121941Sphk#include <dev/led/led.h> 23121941Sphk#include <sys/uio.h> 24121941Sphk 25121941Sphkstruct ledsc { 26121941Sphk LIST_ENTRY(ledsc) list; 27121941Sphk void *private; 28121941Sphk led_t *func; 29121941Sphk dev_t dev; 30121941Sphk struct sbuf *spec; 31121941Sphk char *str; 32121941Sphk char *ptr; 33121941Sphk int count; 34121941Sphk}; 35121941Sphk 36121941Sphkstatic unsigned next_minor; 37121941Sphkstatic struct mtx led_mtx; 38121941Sphkstatic LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(&led_list); 39121941Sphk 40121941SphkMALLOC_DEFINE(M_LED, "LED", "LED driver"); 41121941Sphk 42121941Sphkstatic void 43121941Sphkled_timeout(void *p) 44121941Sphk{ 45121941Sphk struct ledsc *sc; 46121941Sphk 47121941Sphk mtx_lock(&led_mtx); 48121941Sphk LIST_FOREACH(sc, &led_list, list) { 49121941Sphk if (sc->ptr == NULL) 50121941Sphk continue; 51121941Sphk if (sc->count > 0) { 52121941Sphk sc->count--; 53121941Sphk continue; 54121941Sphk } 55123494Sphk if (*sc->ptr >= 'a' && *sc->ptr <= 'j') 56123494Sphk sc->func(sc->private, 0); 57123494Sphk else if (*sc->ptr >= 'A' && *sc->ptr <= 'J') 58123494Sphk sc->func(sc->private, 1); 59123494Sphk sc->count = *sc->ptr & 0xf; 60123494Sphk sc->ptr++; 61123494Sphk if (*sc->ptr == '\0') 62121941Sphk sc->ptr = sc->str; 63121941Sphk } 64121941Sphk mtx_unlock(&led_mtx); 65121941Sphk timeout(led_timeout, p, hz / 10); 66121941Sphk return; 67121941Sphk} 68121941Sphk 69121941Sphkstatic int 70121941Sphkled_write(dev_t dev, struct uio *uio, int ioflag) 71121941Sphk{ 72121941Sphk int error; 73123494Sphk char *s, *s2; 74121941Sphk struct ledsc *sc; 75121941Sphk struct sbuf *sb; 76121941Sphk struct sbuf *sb2; 77121941Sphk int i; 78121941Sphk 79121941Sphk sc = dev->si_drv1; 80121941Sphk 81121941Sphk if (uio->uio_resid > 512) 82121941Sphk return (EINVAL); 83123494Sphk s2 = s = malloc(uio->uio_resid + 1, M_DEVBUF, M_WAITOK); 84121941Sphk if (s == NULL) 85121941Sphk return (ENOMEM); 86121941Sphk s[uio->uio_resid] = '\0'; 87121941Sphk error = uiomove(s, uio->uio_resid, uio); 88121941Sphk if (error) { 89123494Sphk free(s2, M_DEVBUF); 90121941Sphk return (error); 91121941Sphk } 92121941Sphk 93121941Sphk /* 94121941Sphk * Handle "on" and "off" immediately so people can flash really 95121941Sphk * fast from userland if they want to 96121941Sphk */ 97121941Sphk if (*s == '0' || *s == '1') { 98121941Sphk mtx_lock(&led_mtx); 99121941Sphk sb2 = sc->spec; 100121941Sphk sc->spec = NULL; 101121941Sphk sc->str = NULL; 102121941Sphk sc->ptr = NULL; 103121941Sphk sc->count = 0; 104121941Sphk sc->func(sc->private, *s & 1); 105121941Sphk mtx_unlock(&led_mtx); 106121941Sphk if (sb2 != NULL) 107121941Sphk sbuf_delete(sb2); 108123494Sphk free(s2, M_DEVBUF); 109121941Sphk return(0); 110121941Sphk } 111121941Sphk 112121941Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 113121941Sphk if (sb == NULL) { 114123494Sphk free(s2, M_DEVBUF); 115121941Sphk return (ENOMEM); 116121941Sphk } 117121941Sphk 118121941Sphk switch(s[0]) { 119121941Sphk /* 120121941Sphk * Flash, default is 100msec/100msec. 121121941Sphk * 'f2' sets 200msec/200msec etc. 122121941Sphk */ 123121941Sphk case 'f': 124121941Sphk if (s[1] >= '1' && s[1] <= '9') 125121941Sphk i = s[1] - '1'; 126121941Sphk else 127121941Sphk i = 0; 128123014Sphk sbuf_printf(sb, "%c%c", 'A' + i, 'a' + i); 129121941Sphk break; 130121941Sphk /* 131121941Sphk * Digits, flashes out numbers. 132121941Sphk * 'd12' becomes -__________-_-______________________________ 133121941Sphk */ 134121941Sphk case 'd': 135121941Sphk for(s++; *s; s++) { 136121941Sphk if (!isdigit(*s)) 137121941Sphk continue; 138121941Sphk i = *s - '0'; 139121941Sphk if (i == 0) 140121941Sphk i = 10; 141121941Sphk for (; i > 1; i--) 142123014Sphk sbuf_cat(sb, "Aa"); 143123014Sphk sbuf_cat(sb, "Aj"); 144121941Sphk } 145123014Sphk sbuf_cat(sb, "jj"); 146121941Sphk break; 147121941Sphk /* 148121941Sphk * String, roll your own. 149123014Sphk * 'a-j' gives "off" for n/10 sec. 150123014Sphk * 'A-J' gives "on" for n/10 sec. 151121941Sphk * no delay before repeat 152121941Sphk * 'sAaAbBa' becomes _-_--__- 153121941Sphk */ 154121941Sphk case 's': 155121941Sphk for(s++; *s; s++) { 156121941Sphk if ((*s & 0x0f) > 10) 157121941Sphk continue; 158121941Sphk if ((*s & 0xf0) < ' ') 159121941Sphk continue; 160121941Sphk sbuf_bcat(sb, s, 1); 161121941Sphk } 162121941Sphk break; 163121941Sphk /* 164121941Sphk * Morse. 165121941Sphk * '.' becomes _- 166121941Sphk * '-' becomes _--- 167121941Sphk * ' ' becomes __ 168121941Sphk * '\n' becomes ____ 169121941Sphk * 1sec pause between repeats 170121941Sphk * '... --- ...' -> _-_-_-___---_---_---___-_-_-__________ 171121941Sphk */ 172121941Sphk case 'm': 173121941Sphk for(s++; *s; s++) { 174121941Sphk if (*s == '.') 175123014Sphk sbuf_cat(sb, "aA"); 176121941Sphk else if (*s == '-') 177123014Sphk sbuf_cat(sb, "aC"); 178121941Sphk else if (*s == ' ') 179123014Sphk sbuf_cat(sb, "b"); 180121956Sphk else if (*s == '\n') 181123014Sphk sbuf_cat(sb, "d"); 182121941Sphk } 183123014Sphk sbuf_cat(sb, "j"); 184121941Sphk break; 185121941Sphk default: 186123494Sphk sbuf_delete(sb); 187123494Sphk free(s2, M_DEVBUF); 188123494Sphk return (EINVAL); 189121941Sphk } 190121941Sphk sbuf_finish(sb); 191123494Sphk free(s2, M_DEVBUF); 192121941Sphk if (sbuf_overflowed(sb)) { 193121941Sphk sbuf_delete(sb); 194121941Sphk return (ENOMEM); 195121941Sphk } 196121941Sphk if (sbuf_len(sb) == 0) { 197121941Sphk sbuf_delete(sb); 198121941Sphk return (0); 199121941Sphk } 200121941Sphk 201121941Sphk mtx_lock(&led_mtx); 202121941Sphk sb2 = sc->spec; 203121941Sphk sc->spec = sb; 204121941Sphk sc->str = sbuf_data(sb); 205121941Sphk sc->ptr = sc->str; 206121941Sphk sc->count = 0; 207121941Sphk mtx_unlock(&led_mtx); 208121941Sphk if (sb2 != NULL) 209121941Sphk sbuf_delete(sb2); 210121941Sphk return(0); 211121941Sphk} 212121941Sphk 213121941Sphkstatic struct cdevsw led_cdevsw = { 214125810Sphk .d_write = led_write, 215125810Sphk .d_name = "LED", 216121941Sphk}; 217121941Sphk 218121941Sphkdev_t 219121941Sphkled_create(led_t *func, void *priv, char const *name) 220121941Sphk{ 221121941Sphk struct ledsc *sc; 222121941Sphk struct sbuf *sb; 223121941Sphk 224121941Sphk if (next_minor == 0) { 225123272Struckman mtx_init(&led_mtx, "LED mtx", NULL, MTX_DEF); 226121941Sphk timeout(led_timeout, NULL, hz / 10); 227121941Sphk } 228121941Sphk 229121941Sphk sb = sbuf_new(NULL, NULL, SPECNAMELEN, SBUF_FIXEDLEN); 230121941Sphk if (sb == NULL) 231121941Sphk return (NODEV); 232121941Sphk sbuf_cpy(sb, "led/"); 233121941Sphk sbuf_cat(sb, name); 234121941Sphk sbuf_finish(sb); 235121941Sphk if (sbuf_overflowed(sb)) { 236121941Sphk sbuf_delete(sb); 237121941Sphk return (NODEV); 238121941Sphk } 239121941Sphk 240121941Sphk sc = malloc(sizeof *sc, M_LED, M_WAITOK | M_ZERO); 241121941Sphk sc->private = priv; 242121941Sphk sc->func = func; 243121941Sphk sc->dev = make_dev(&led_cdevsw, unit2minor(next_minor), 244121941Sphk UID_ROOT, GID_WHEEL, 0600, sbuf_data(sb)); 245121941Sphk sc->dev->si_drv1 = sc; 246121941Sphk next_minor++; 247121941Sphk sbuf_delete(sb); 248121941Sphk mtx_lock(&led_mtx); 249121941Sphk LIST_INSERT_HEAD(&led_list, sc, list); 250121941Sphk mtx_unlock(&led_mtx); 251121941Sphk return (sc->dev); 252121941Sphk} 253121941Sphk 254121941Sphkvoid 255121941Sphkled_destroy(dev_t dev) 256121941Sphk{ 257121941Sphk struct ledsc *sc; 258121941Sphk 259121941Sphk sc = dev->si_drv1; 260121941Sphk mtx_lock(&led_mtx); 261121941Sphk LIST_REMOVE(sc, list); 262121941Sphk mtx_unlock(&led_mtx); 263122963Sphk if (sc->spec != NULL) 264122963Sphk sbuf_delete(sc->spec); 265121941Sphk destroy_dev(dev); 266121941Sphk free(sc, M_LED); 267121941Sphk} 268