mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
69c2a7707d
Make led(4) fire callouts at 10Hz only when there is at least one LED that is requested to blink. Do not fire if all LEDs are static (usual case).
338 lines
6.9 KiB
C
338 lines
6.9 KiB
C
/*-
|
|
* ----------------------------------------------------------------------------
|
|
* "THE BEER-WARE LICENSE" (Revision 42):
|
|
* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
|
|
* can do whatever you want with this stuff. If we meet some day, and you think
|
|
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
|
|
* ----------------------------------------------------------------------------
|
|
*
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/ctype.h>
|
|
#include <sys/sbuf.h>
|
|
#include <sys/queue.h>
|
|
#include <dev/led/led.h>
|
|
#include <sys/uio.h>
|
|
#include <sys/sx.h>
|
|
|
|
struct ledsc {
|
|
LIST_ENTRY(ledsc) list;
|
|
char *name;
|
|
void *private;
|
|
int unit;
|
|
led_t *func;
|
|
struct cdev *dev;
|
|
struct sbuf *spec;
|
|
char *str;
|
|
char *ptr;
|
|
int count;
|
|
time_t last_second;
|
|
};
|
|
|
|
static struct unrhdr *led_unit;
|
|
static struct mtx led_mtx;
|
|
static struct sx led_sx;
|
|
static LIST_HEAD(, ledsc) led_list = LIST_HEAD_INITIALIZER(led_list);
|
|
static struct callout led_ch;
|
|
static int blinkers = 0;
|
|
|
|
static MALLOC_DEFINE(M_LED, "LED", "LED driver");
|
|
|
|
static void
|
|
led_timeout(void *p)
|
|
{
|
|
struct ledsc *sc;
|
|
|
|
LIST_FOREACH(sc, &led_list, list) {
|
|
if (sc->ptr == NULL)
|
|
continue;
|
|
if (sc->count > 0) {
|
|
sc->count--;
|
|
continue;
|
|
}
|
|
if (*sc->ptr == '.') {
|
|
sc->ptr = NULL;
|
|
blinkers--;
|
|
continue;
|
|
} else if (*sc->ptr == 'U' || *sc->ptr == 'u') {
|
|
if (sc->last_second == time_second)
|
|
continue;
|
|
sc->last_second = time_second;
|
|
sc->func(sc->private, *sc->ptr == 'U');
|
|
} else if (*sc->ptr >= 'a' && *sc->ptr <= 'j') {
|
|
sc->func(sc->private, 0);
|
|
sc->count = (*sc->ptr & 0xf) - 1;
|
|
} else if (*sc->ptr >= 'A' && *sc->ptr <= 'J') {
|
|
sc->func(sc->private, 1);
|
|
sc->count = (*sc->ptr & 0xf) - 1;
|
|
}
|
|
sc->ptr++;
|
|
if (*sc->ptr == '\0')
|
|
sc->ptr = sc->str;
|
|
}
|
|
if (blinkers > 0)
|
|
callout_reset(&led_ch, hz / 10, led_timeout, p);
|
|
}
|
|
|
|
static int
|
|
led_state(struct ledsc *sc, struct sbuf **sb, int state)
|
|
{
|
|
struct sbuf *sb2 = NULL;
|
|
|
|
sb2 = sc->spec;
|
|
sc->spec = *sb;
|
|
if (*sb != NULL) {
|
|
sc->str = sbuf_data(*sb);
|
|
if (sc->ptr == NULL) {
|
|
blinkers++;
|
|
callout_reset(&led_ch, hz / 10, led_timeout, NULL);
|
|
}
|
|
sc->ptr = sc->str;
|
|
} else {
|
|
sc->str = NULL;
|
|
if (sc->ptr != NULL)
|
|
blinkers--;
|
|
sc->ptr = NULL;
|
|
sc->func(sc->private, state);
|
|
}
|
|
sc->count = 0;
|
|
*sb = sb2;
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
led_parse(const char *s, struct sbuf **sb, int *state)
|
|
{
|
|
int i, error;
|
|
|
|
/*
|
|
* Handle "on" and "off" immediately so people can flash really
|
|
* fast from userland if they want to
|
|
*/
|
|
if (*s == '0' || *s == '1') {
|
|
*state = *s & 1;
|
|
return (0);
|
|
}
|
|
|
|
*state = 0;
|
|
*sb = sbuf_new_auto();
|
|
if (*sb == NULL)
|
|
return (ENOMEM);
|
|
switch(s[0]) {
|
|
/*
|
|
* Flash, default is 100msec/100msec.
|
|
* 'f2' sets 200msec/200msec etc.
|
|
*/
|
|
case 'f':
|
|
if (s[1] >= '1' && s[1] <= '9')
|
|
i = s[1] - '1';
|
|
else
|
|
i = 0;
|
|
sbuf_printf(*sb, "%c%c", 'A' + i, 'a' + i);
|
|
break;
|
|
/*
|
|
* Digits, flashes out numbers.
|
|
* 'd12' becomes -__________-_-______________________________
|
|
*/
|
|
case 'd':
|
|
for(s++; *s; s++) {
|
|
if (!isdigit(*s))
|
|
continue;
|
|
i = *s - '0';
|
|
if (i == 0)
|
|
i = 10;
|
|
for (; i > 1; i--)
|
|
sbuf_cat(*sb, "Aa");
|
|
sbuf_cat(*sb, "Aj");
|
|
}
|
|
sbuf_cat(*sb, "jj");
|
|
break;
|
|
/*
|
|
* String, roll your own.
|
|
* 'a-j' gives "off" for n/10 sec.
|
|
* 'A-J' gives "on" for n/10 sec.
|
|
* no delay before repeat
|
|
* 'sAaAbBa' becomes _-_--__-
|
|
*/
|
|
case 's':
|
|
for(s++; *s; s++) {
|
|
if ((*s >= 'a' && *s <= 'j') ||
|
|
(*s >= 'A' && *s <= 'J') ||
|
|
*s == 'U' || *s <= 'u' ||
|
|
*s == '.')
|
|
sbuf_bcat(*sb, s, 1);
|
|
}
|
|
break;
|
|
/*
|
|
* Morse.
|
|
* '.' becomes _-
|
|
* '-' becomes _---
|
|
* ' ' becomes __
|
|
* '\n' becomes ____
|
|
* 1sec pause between repeats
|
|
* '... --- ...' -> _-_-_-___---_---_---___-_-_-__________
|
|
*/
|
|
case 'm':
|
|
for(s++; *s; s++) {
|
|
if (*s == '.')
|
|
sbuf_cat(*sb, "aA");
|
|
else if (*s == '-')
|
|
sbuf_cat(*sb, "aC");
|
|
else if (*s == ' ')
|
|
sbuf_cat(*sb, "b");
|
|
else if (*s == '\n')
|
|
sbuf_cat(*sb, "d");
|
|
}
|
|
sbuf_cat(*sb, "j");
|
|
break;
|
|
default:
|
|
sbuf_delete(*sb);
|
|
return (EINVAL);
|
|
}
|
|
error = sbuf_finish(*sb);
|
|
if (error != 0 || sbuf_len(*sb) == 0) {
|
|
*sb = NULL;
|
|
return (error);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
led_write(struct cdev *dev, struct uio *uio, int ioflag)
|
|
{
|
|
struct ledsc *sc;
|
|
char *s;
|
|
struct sbuf *sb = NULL;
|
|
int error, state = 0;
|
|
|
|
if (uio->uio_resid > 512)
|
|
return (EINVAL);
|
|
s = malloc(uio->uio_resid + 1, M_DEVBUF, M_WAITOK);
|
|
s[uio->uio_resid] = '\0';
|
|
error = uiomove(s, uio->uio_resid, uio);
|
|
if (error) {
|
|
free(s, M_DEVBUF);
|
|
return (error);
|
|
}
|
|
error = led_parse(s, &sb, &state);
|
|
free(s, M_DEVBUF);
|
|
if (error)
|
|
return (error);
|
|
mtx_lock(&led_mtx);
|
|
sc = dev->si_drv1;
|
|
if (sc != NULL)
|
|
error = led_state(sc, &sb, state);
|
|
mtx_unlock(&led_mtx);
|
|
if (sb != NULL)
|
|
sbuf_delete(sb);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
led_set(char const *name, char const *cmd)
|
|
{
|
|
struct ledsc *sc;
|
|
struct sbuf *sb = NULL;
|
|
int error, state = 0;
|
|
|
|
error = led_parse(cmd, &sb, &state);
|
|
if (error)
|
|
return (error);
|
|
mtx_lock(&led_mtx);
|
|
LIST_FOREACH(sc, &led_list, list) {
|
|
if (strcmp(sc->name, name) == 0)
|
|
break;
|
|
}
|
|
if (sc != NULL)
|
|
error = led_state(sc, &sb, state);
|
|
else
|
|
error = ENOENT;
|
|
mtx_unlock(&led_mtx);
|
|
if (sb != NULL)
|
|
sbuf_delete(sb);
|
|
return (0);
|
|
}
|
|
|
|
static struct cdevsw led_cdevsw = {
|
|
.d_version = D_VERSION,
|
|
.d_write = led_write,
|
|
.d_name = "LED",
|
|
};
|
|
|
|
struct cdev *
|
|
led_create(led_t *func, void *priv, char const *name)
|
|
{
|
|
|
|
return (led_create_state(func, priv, name, 0));
|
|
}
|
|
struct cdev *
|
|
led_create_state(led_t *func, void *priv, char const *name, int state)
|
|
{
|
|
struct ledsc *sc;
|
|
|
|
sc = malloc(sizeof *sc, M_LED, M_WAITOK | M_ZERO);
|
|
|
|
sx_xlock(&led_sx);
|
|
sc->name = strdup(name, M_LED);
|
|
sc->unit = alloc_unr(led_unit);
|
|
sc->private = priv;
|
|
sc->func = func;
|
|
sc->dev = make_dev(&led_cdevsw, sc->unit,
|
|
UID_ROOT, GID_WHEEL, 0600, "led/%s", name);
|
|
sx_xunlock(&led_sx);
|
|
|
|
mtx_lock(&led_mtx);
|
|
sc->dev->si_drv1 = sc;
|
|
LIST_INSERT_HEAD(&led_list, sc, list);
|
|
sc->func(sc->private, state != 0);
|
|
mtx_unlock(&led_mtx);
|
|
|
|
return (sc->dev);
|
|
}
|
|
|
|
void
|
|
led_destroy(struct cdev *dev)
|
|
{
|
|
struct ledsc *sc;
|
|
|
|
mtx_lock(&led_mtx);
|
|
sc = dev->si_drv1;
|
|
dev->si_drv1 = NULL;
|
|
if (sc->ptr != NULL)
|
|
blinkers--;
|
|
LIST_REMOVE(sc, list);
|
|
if (LIST_EMPTY(&led_list))
|
|
callout_stop(&led_ch);
|
|
mtx_unlock(&led_mtx);
|
|
|
|
sx_xlock(&led_sx);
|
|
free_unr(led_unit, sc->unit);
|
|
destroy_dev(dev);
|
|
if (sc->spec != NULL)
|
|
sbuf_delete(sc->spec);
|
|
free(sc->name, M_LED);
|
|
free(sc, M_LED);
|
|
sx_xunlock(&led_sx);
|
|
}
|
|
|
|
static void
|
|
led_drvinit(void *unused)
|
|
{
|
|
|
|
led_unit = new_unrhdr(0, INT_MAX, NULL);
|
|
mtx_init(&led_mtx, "LED mtx", NULL, MTX_DEF);
|
|
sx_init(&led_sx, "LED sx");
|
|
callout_init_mtx(&led_ch, &led_mtx, 0);
|
|
}
|
|
|
|
SYSINIT(leddev, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, led_drvinit, NULL);
|