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