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 * ----------------------------------------------------------------------------
9 * $FreeBSD: head/sys/dev/led/led.c 247008 2013-02-19 19:25:50Z mav $
12 #include <sys/param.h>
14 #include <sys/kernel.h>
15 #include <sys/systm.h>
16 #include <sys/limits.h>
17 #include <sys/malloc.h>
18 #include <sys/ctype.h>
20 #include <sys/queue.h>
21 #include <dev/misc/led/led.h>
23 #include <sys/device.h>
26 LIST_ENTRY(ledsc) list;
39 static struct unrhdr *led_unit;
40 static struct lock led_lock;
41 static struct lock led_lock2;
42 static LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(led_list);
43 static struct callout led_ch;
44 static int blinkers = 0;
46 static MALLOC_DEFINE(M_LED, "LED", "LED driver");
53 lockmgr(&led_lock, LK_EXCLUSIVE);
54 LIST_FOREACH(sc, &led_list, list) {
61 if (*sc->ptr == '.') {
65 } else if (*sc->ptr == 'U' || *sc->ptr == 'u') {
66 if (sc->last_second == time_second)
68 sc->last_second = time_second;
69 sc->func(sc->private, *sc->ptr == 'U');
70 } else if (*sc->ptr >= 'a' && *sc->ptr <= 'j') {
71 sc->func(sc->private, 0);
72 sc->count = (*sc->ptr & 0xf) - 1;
73 } else if (*sc->ptr >= 'A' && *sc->ptr <= 'J') {
74 sc->func(sc->private, 1);
75 sc->count = (*sc->ptr & 0xf) - 1;
82 callout_reset(&led_ch, hz / 10, led_timeout, p);
83 lockmgr(&led_lock, LK_RELEASE);
87 led_state(struct ledsc *sc, struct sbuf **sb, int state)
89 struct sbuf *sb2 = NULL;
94 sc->str = sbuf_data(*sb);
95 if (sc->ptr == NULL) {
97 callout_reset(&led_ch, hz / 10, led_timeout, NULL);
105 sc->func(sc->private, state);
113 led_parse(const char *s, struct sbuf **sb, int *state)
118 * Handle "on" and "off" immediately so people can flash really
119 * fast from userland if they want to
121 if (*s == '0' || *s == '1') {
127 *sb = sbuf_new_auto();
132 * Flash, default is 100msec/100msec.
133 * 'f2' sets 200msec/200msec etc.
136 if (s[1] >= '1' && s[1] <= '9')
140 sbuf_printf(*sb, "%c%c", 'A' + i, 'a' + i);
143 * Digits, flashes out numbers.
144 * 'd12' becomes -__________-_-______________________________
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 _-_--__-
168 if ((*s >= 'a' && *s <= 'j') ||
169 (*s >= 'A' && *s <= 'J') ||
170 *s == 'U' || *s <= 'u' ||
172 sbuf_bcat(*sb, s, 1);
181 * 1sec pause between repeats
182 * '... --- ...' -> _-_-_-___---_---_---___-_-_-__________
201 error = sbuf_finish(*sb);
202 if (error != 0 || sbuf_len(*sb) == 0) {
210 led_open(struct dev_open_args *ap)
216 led_close(struct dev_close_args *ap)
222 led_write(struct dev_write_args *ap)
224 struct uio *uio = ap->a_uio;
225 cdev_t dev = ap->a_head.a_dev;
228 struct sbuf *sb = NULL;
229 int error, state = 0;
231 if (uio->uio_resid > 512)
233 s = kmalloc(uio->uio_resid + 1, M_DEVBUF, M_WAITOK);
234 s[uio->uio_resid] = '\0';
235 error = uiomove(s, uio->uio_resid, uio);
240 error = led_parse(s, &sb, &state);
244 lockmgr(&led_lock, LK_EXCLUSIVE);
247 error = led_state(sc, &sb, state);
248 lockmgr(&led_lock, LK_RELEASE);
255 led_set(char const *name, char const *cmd)
258 struct sbuf *sb = NULL;
259 int error, state = 0;
261 error = led_parse(cmd, &sb, &state);
264 lockmgr(&led_lock, LK_EXCLUSIVE);
265 LIST_FOREACH(sc, &led_list, list) {
266 if (strcmp(sc->name, name) == 0)
270 error = led_state(sc, &sb, state);
273 lockmgr(&led_lock, LK_RELEASE);
279 static struct dev_ops led_ops = {
282 .d_close = led_close,
283 .d_write = led_write,
287 led_create(led_t *func, void *priv, char const *name)
290 return (led_create_state(func, priv, name, 0));
293 led_create_state(led_t *func, void *priv, char const *name, int state)
297 sc = kmalloc(sizeof *sc, M_LED, M_WAITOK | M_ZERO);
299 lockmgr(&led_lock2, LK_EXCLUSIVE);
300 sc->name = kstrdup(name, M_LED);
301 sc->unit = alloc_unr(led_unit);
304 sc->dev = make_dev(&led_ops, sc->unit,
305 UID_ROOT, GID_WHEEL, 0600, "led/%s", name);
306 lockmgr(&led_lock2, LK_RELEASE);
308 lockmgr(&led_lock, LK_EXCLUSIVE);
309 sc->dev->si_drv1 = sc;
310 LIST_INSERT_HEAD(&led_list, sc, list);
311 sc->func(sc->private, state != 0);
312 lockmgr(&led_lock, LK_RELEASE);
318 led_destroy(struct cdev *dev)
322 lockmgr(&led_lock, LK_EXCLUSIVE);
327 LIST_REMOVE(sc, list);
328 if (LIST_EMPTY(&led_list))
329 callout_stop(&led_ch);
330 lockmgr(&led_lock, LK_RELEASE);
332 lockmgr(&led_lock2, LK_EXCLUSIVE);
333 free_unr(led_unit, sc->unit);
335 if (sc->spec != NULL)
336 sbuf_delete(sc->spec);
337 kfree(sc->name, M_LED);
339 lockmgr(&led_lock2, LK_RELEASE);
343 led_drvinit(void *unused)
346 led_unit = new_unrhdr(0, INT_MAX, NULL);
347 lockinit(&led_lock, "LED lock", 0, LK_CANRECURSE);
348 lockinit(&led_lock2, "LED lock2", 0, LK_CANRECURSE);
349 callout_init_mp(&led_ch);
352 SYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL);