1 /*-
26 #include <sys/param.h>
27 #include <sys/systm.h>
28 #include <sys/kernel.h>
30 #include <sys/bus.h>
31 #include <sys/errno.h>
32 #include <sys/libkern.h>
33 #include <sys/lock.h>
34 #include <sys/malloc.h>
35 #include <sys/module.h>
36 #include <sys/mutex.h>
37 #include <sys/sbuf.h>
38 #include <sys/sysctl.h>
40 #include <dev/ow/ow.h>
41 #include <dev/ow/owll.h>
42 #include <dev/ow/own.h>
45  * lldev - link level device
46  * ndev - network / transport device (this module)
47  * pdev - presentation device (children of this module)
68 #define	OW_LOCK(_sc) mtx_lock(&(_sc)->mtx)
69 #define	OW_UNLOCK(_sc) mtx_unlock(&(_sc)->mtx)
70 #define	OW_LOCK_DESTROY(_sc) mtx_destroy(&_sc->mtx)
71 #define	OW_ASSERT_LOCKED(_sc) mtx_assert(&_sc->mtx, MA_OWNED)
72 #define	OW_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->mtx, MA_NOTOWNED)
162     "1-Wire protocol");
175 	    if (err != 0 || req->newptr == NULL) \
187     "1-Wire timing parameter in microseconds (-1 resets to default)")
251 	} while (present == 1 && tries-- > 0);  in ow_send_command()
256 	if (present == -1) {  in ow_send_command()
261 	for (i = 0; i < cmd->rom_len; i++)  in ow_send_command()
262 		ow_send_byte(lldev, &timing_regular, cmd->rom_cmd[i]);  in ow_send_command()
263 	for (i = 0; i < cmd->rom_read_len; i++)  in ow_send_command()
264 		ow_read_byte(lldev, &timing_regular, cmd->rom_read + i);  in ow_send_command()
265 	if (cmd->xpt_len) {  in ow_send_command()
267 		 * Per AN937, the reset pulse and ROM level are always  in ow_send_command()
268 		 * done with the regular timings. Certain ROM commands  in ow_send_command()
274 		t = (cmd->flags & OW_FLAG_OVERDRIVE) ?  in ow_send_command()
276 		for (i = 0; i < cmd->xpt_len; i++)  in ow_send_command()
277 			ow_send_byte(lldev, t, cmd->xpt_cmd[i]);  in ow_send_command()
278 		if (cmd->flags & OW_FLAG_READ_BIT) {  in ow_send_command()
279 			memset(cmd->xpt_read, 0, (cmd->xpt_read_len + 7) / 8);  in ow_send_command()
280 			for (i = 0; i < cmd->xpt_read_len; i++) {  in ow_send_command()
282 				cmd->xpt_read[i / 8] |= bit << (i % 8);  in ow_send_command()
285 			for (i = 0; i < cmd->xpt_read_len; i++)  in ow_send_command()
286 				ow_read_byte(lldev, t, cmd->xpt_read + i);  in ow_send_command()
323 	di->romid = romid;  in ow_add_child()
352 		if (di->romid == romid) {  in ow_child_by_romid()
363  * CRC generator table -- taken from AN937 DOW CRC LOOKUP FUNCTION Table 2
375 	17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
410 	 * All valid ROM IDs have a valid CRC. Check that first.  in ow_device_found()
435 	prior = -1;  in ow_enumerate()
438 	last = -2;  in ow_enumerate()
442 	while (last != -1) {  in ow_enumerate()
443 		if (sanity-- < 0) {  in ow_enumerate()
449 		last = -1;  in ow_enumerate()
454 		 * send ROM ID bits one at a time (first the bit, then the  in ow_enumerate()
461 		 * devices on the bus and wind up with a unique ROM. We know  in ow_enumerate()
494 			case 1: /* 1 then 0 -> 1 for all */  in ow_enumerate()
497 			case 2: /* 0 then 1 -> 0 for all */  in ow_enumerate()
507 				 * the top of the loop for a re-do of this step.  in ow_enumerate()
558 	sc->dev = ndev;  in ow_attach()
559 	mtx_init(&sc->mtx, device_get_nameunit(sc->dev), "ow", MTX_DEF);  in ow_attach()
587 	sbuf_printf(sb, "romid=%8D", &di->romid, ":");  in ow_child_pnpinfo()
600 		*result = di->romid & 0xff;  in ow_read_ivar()
604 		*ptr = &di->romid;  in ow_read_ivar()
629 	retval += printf(" romid %8D", &di->romid, ":");  in ow_print_child()
641 	device_printf(ndev, "romid %8D: no driver\n", &di->romid, ":");  in ow_probe_nomatch()
652 	if (sc->owner != NULL) {  in ow_acquire_bus()
653 		if (sc->owner == pdev)  in ow_acquire_bus()
661 		while (sc->owner != NULL)  in ow_acquire_bus()
662 			mtx_sleep(sc, &sc->mtx, 0, "owbuswait", 0);  in ow_acquire_bus()
664 	sc->owner = pdev;  in ow_acquire_bus()
678 	if (sc->owner == NULL)  in ow_release_bus()
681 	if (sc->owner != pdev)  in ow_release_bus()
684 		    device_get_nameunit(sc->owner));  in ow_release_bus()
685 	sc->owner = NULL;  in ow_release_bus()