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 * ----------------------------------------------------------------------------
11 #include <sys/cdefs.h>
12 __FBSDID("$FreeBSD$");
14 #include <sys/param.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>
22 #include <sys/queue.h>
23 #include <dev/led/led.h>
28 LIST_ENTRY(ledsc) list;
40 static struct unrhdr *led_unit;
41 static struct mtx led_mtx;
42 static struct sx led_sx;
43 static LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(led_list);
44 static struct callout led_ch;
46 static MALLOC_DEFINE(M_LED, "LED", "LED driver");
54 LIST_FOREACH(sc, &led_list, list) {
61 if (*sc->ptr == '.') {
64 } else if (*sc->ptr == 'U' || *sc->ptr == 'u') {
65 if (sc->last_second == time_second)
67 sc->last_second = time_second;
68 sc->func(sc->private, *sc->ptr == 'U');
69 } else if (*sc->ptr >= 'a' && *sc->ptr <= 'j') {
70 sc->func(sc->private, 0);
71 sc->count = (*sc->ptr & 0xf) - 1;
72 } else if (*sc->ptr >= 'A' && *sc->ptr <= 'J') {
73 sc->func(sc->private, 1);
74 sc->count = (*sc->ptr & 0xf) - 1;
81 callout_reset(&led_ch, hz / 10, led_timeout, p);
86 led_state(struct cdev *dev, struct sbuf *sb, int state)
88 struct sbuf *sb2 = NULL;
97 sc->str = sbuf_data(sb);
102 sc->func(sc->private, state);
106 mtx_unlock(&led_mtx);
115 led_write(struct cdev *dev, struct uio *uio, int ioflag)
119 struct sbuf *sb = NULL;
122 if (dev->si_drv1 == NULL)
125 if (uio->uio_resid > 512)
127 s2 = s = malloc(uio->uio_resid + 1, M_DEVBUF, M_WAITOK);
128 s[uio->uio_resid] = '\0';
129 error = uiomove(s, uio->uio_resid, uio);
136 * Handle "on" and "off" immediately so people can flash really
137 * fast from userland if they want to
139 if (*s == '0' || *s == '1') {
140 error = led_state(dev, NULL, *s & 1);
145 sb = sbuf_new_auto();
153 * Flash, default is 100msec/100msec.
154 * 'f2' sets 200msec/200msec etc.
157 if (s[1] >= '1' && s[1] <= '9')
161 sbuf_printf(sb, "%c%c", 'A' + i, 'a' + i);
164 * Digits, flashes out numbers.
165 * 'd12' becomes -__________-_-______________________________
181 * String, roll your own.
182 * 'a-j' gives "off" for n/10 sec.
183 * 'A-J' gives "on" for n/10 sec.
184 * no delay before repeat
185 * 'sAaAbBa' becomes _-_--__-
189 if ((*s >= 'a' && *s <= 'j') ||
190 (*s >= 'A' && *s <= 'J') ||
191 *s == 'U' || *s <= 'u' ||
202 * 1sec pause between repeats
203 * '... --- ...' -> _-_-_-___---_---_---___-_-_-__________
225 if (sbuf_overflowed(sb)) {
229 if (sbuf_len(sb) == 0) {
234 return (led_state(dev, sb, 0));
237 static struct cdevsw led_cdevsw = {
238 .d_version = D_VERSION,
239 .d_write = led_write,
244 led_create(led_t *func, void *priv, char const *name)
247 return (led_create_state(func, priv, name, 0));
250 led_create_state(led_t *func, void *priv, char const *name, int state)
254 sc = malloc(sizeof *sc, M_LED, M_WAITOK | M_ZERO);
257 sc->unit = alloc_unr(led_unit);
260 sc->dev = make_dev(&led_cdevsw, sc->unit,
261 UID_ROOT, GID_WHEEL, 0600, "led/%s", name);
265 sc->dev->si_drv1 = sc;
266 if (LIST_EMPTY(&led_list))
267 callout_reset(&led_ch, hz / 10, led_timeout, NULL);
268 LIST_INSERT_HEAD(&led_list, sc, list);
269 sc->func(sc->private, state != 0);
270 mtx_unlock(&led_mtx);
276 led_destroy(struct cdev *dev)
284 LIST_REMOVE(sc, list);
285 if (LIST_EMPTY(&led_list))
286 callout_stop(&led_ch);
287 mtx_unlock(&led_mtx);
290 free_unr(led_unit, sc->unit);
292 if (sc->spec != NULL)
293 sbuf_delete(sc->spec);
299 led_drvinit(void *unused)
302 led_unit = new_unrhdr(0, INT_MAX, NULL);
303 mtx_init(&led_mtx, "LED mtx", NULL, MTX_DEF);
304 sx_init(&led_sx, "LED sx");
305 callout_init(&led_ch, CALLOUT_MPSAFE);
308 SYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL);