xref: /freebsd-12.1/sys/dev/sound/isa/gusc.c (revision d6b66397)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 1999 Seigo Tanimura
5  * Copyright (c) 1999 Ville-Pertti Keinonen
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/bus.h>
34 #include <sys/malloc.h>
35 #include <sys/module.h>
36 #include <machine/resource.h>
37 #include <machine/bus.h>
38 #include <sys/rman.h>
39 
40 #ifdef HAVE_KERNEL_OPTION_HEADERS
41 #include "opt_snd.h"
42 #endif
43 
44 #include <dev/sound/pcm/sound.h>
45 #include <dev/sound/chip.h>
46 #include "bus_if.h"
47 
48 #include <isa/isavar.h>
49 #include <isa/isa_common.h>
50 
51 SND_DECLARE_FILE("$FreeBSD$");
52 
53 #define LOGICALID_NOPNP 0
54 #define LOGICALID_PCM   0x0000561e
55 #define LOGICALID_OPL   0x0300561e
56 #define LOGICALID_MIDI  0x0400561e
57 
58 /* PnP IDs */
59 static struct isa_pnp_id gusc_ids[] = {
60 	{LOGICALID_PCM,  "GRV0000 Gravis UltraSound PnP PCM"},	/* GRV0000 */
61 	{LOGICALID_OPL,  "GRV0003 Gravis UltraSound PnP OPL"},	/* GRV0003 */
62 	{LOGICALID_MIDI, "GRV0004 Gravis UltraSound PnP MIDI"},	/* GRV0004 */
63 };
64 
65 /* Interrupt handler.  */
66 struct gusc_ihandler {
67 	void (*intr)(void *);
68 	void *arg;
69 };
70 
71 /* Here is the parameter structure per a device. */
72 struct gusc_softc {
73 	device_t dev; /* device */
74 	int io_rid[3]; /* io port rids */
75 	struct resource *io[3]; /* io port resources */
76 	int io_alloced[3]; /* io port alloc flag */
77 	int irq_rid; /* irq rids */
78 	struct resource *irq; /* irq resources */
79 	int irq_alloced; /* irq alloc flag */
80 	int drq_rid[2]; /* drq rids */
81 	struct resource *drq[2]; /* drq resources */
82 	int drq_alloced[2]; /* drq alloc flag */
83 
84 	/* Interrupts are shared (XXX non-PnP only?) */
85 	struct gusc_ihandler midi_intr;
86 	struct gusc_ihandler pcm_intr;
87 };
88 
89 typedef struct gusc_softc *sc_p;
90 
91 static int gusc_probe(device_t dev);
92 static int gusc_attach(device_t dev);
93 static int gusisa_probe(device_t dev);
94 static void gusc_intr(void *);
95 static struct resource *gusc_alloc_resource(device_t bus, device_t child, int type, int *rid,
96 					    rman_res_t start, rman_res_t end, rman_res_t count, u_int flags);
97 static int gusc_release_resource(device_t bus, device_t child, int type, int rid,
98 				   struct resource *r);
99 
100 static device_t find_masterdev(sc_p scp);
101 static int alloc_resource(sc_p scp);
102 static int release_resource(sc_p scp);
103 
104 static devclass_t gusc_devclass;
105 
106 static int
gusc_probe(device_t dev)107 gusc_probe(device_t dev)
108 {
109 	device_t child;
110 	u_int32_t logical_id;
111 	char *s;
112 	struct sndcard_func *func;
113 	int ret;
114 
115 	logical_id = isa_get_logicalid(dev);
116 	s = NULL;
117 
118 	/* Check isapnp ids */
119 	if (logical_id != 0 && (ret = ISA_PNP_PROBE(device_get_parent(dev), dev, gusc_ids)) != 0)
120 		return (ret);
121 	else {
122 		if (logical_id == 0)
123 			return gusisa_probe(dev);
124 	}
125 
126 	switch (logical_id) {
127 	case LOGICALID_PCM:
128 		s = "Gravis UltraSound Plug & Play PCM";
129 		func = malloc(sizeof(struct sndcard_func), M_DEVBUF, M_NOWAIT | M_ZERO);
130 		if (func == NULL)
131 			return (ENOMEM);
132 		func->func = SCF_PCM;
133 		child = device_add_child(dev, "pcm", -1);
134 		device_set_ivars(child, func);
135 		break;
136 	case LOGICALID_OPL:
137 		s = "Gravis UltraSound Plug & Play OPL";
138 		func = malloc(sizeof(struct sndcard_func), M_DEVBUF, M_NOWAIT | M_ZERO);
139 		if (func == NULL)
140 			return (ENOMEM);
141 		func->func = SCF_SYNTH;
142 		child = device_add_child(dev, "midi", -1);
143 		device_set_ivars(child, func);
144 		break;
145 	case LOGICALID_MIDI:
146 		s = "Gravis UltraSound Plug & Play MIDI";
147 		func = malloc(sizeof(struct sndcard_func), M_DEVBUF, M_NOWAIT | M_ZERO);
148 		if (func == NULL)
149 			return (ENOMEM);
150 		func->func = SCF_MIDI;
151 		child = device_add_child(dev, "midi", -1);
152 		device_set_ivars(child, func);
153 		break;
154 	}
155 
156 	if (s != NULL) {
157 		device_set_desc(dev, s);
158 		return (0);
159 	}
160 
161 	return (ENXIO);
162 }
163 
164 static void
port_wr(struct resource * r,int i,unsigned char v)165 port_wr(struct resource *r, int i, unsigned char v)
166 {
167 	bus_space_write_1(rman_get_bustag(r), rman_get_bushandle(r), i, v);
168 }
169 
170 static int
port_rd(struct resource * r,int i)171 port_rd(struct resource *r, int i)
172 {
173 	return bus_space_read_1(rman_get_bustag(r), rman_get_bushandle(r), i);
174 }
175 
176 /*
177  * Probe for an old (non-PnP) GUS card on the ISA bus.
178  */
179 
180 static int
gusisa_probe(device_t dev)181 gusisa_probe(device_t dev)
182 {
183 	device_t child;
184 	struct resource *res, *res2;
185 	int base, rid, rid2, s, flags;
186 	unsigned char val;
187 
188 	base = isa_get_port(dev);
189 	flags = device_get_flags(dev);
190 	rid = 1;
191 	res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, base + 0x100,
192 				 base + 0x107, 8, RF_ACTIVE);
193 
194 	if (res == NULL)
195 		return ENXIO;
196 
197 	res2 = NULL;
198 
199 	/*
200 	 * Check for the presence of some GUS card.  Reset the card,
201 	 * then see if we can access the memory on it.
202 	 */
203 
204 	port_wr(res, 3, 0x4c);
205 	port_wr(res, 5, 0);
206 	DELAY(30 * 1000);
207 
208 	port_wr(res, 3, 0x4c);
209 	port_wr(res, 5, 1);
210 	DELAY(30 * 1000);
211 
212 	s = splhigh();
213 
214 	/* Write to DRAM.  */
215 
216 	port_wr(res, 3, 0x43);		/* Register select */
217 	port_wr(res, 4, 0);		/* Low addr */
218 	port_wr(res, 5, 0);		/* Med addr */
219 
220 	port_wr(res, 3, 0x44);		/* Register select */
221 	port_wr(res, 4, 0);		/* High addr */
222 	port_wr(res, 7, 0x55);		/* DRAM */
223 
224 	/* Read from DRAM.  */
225 
226 	port_wr(res, 3, 0x43);		/* Register select */
227 	port_wr(res, 4, 0);		/* Low addr */
228 	port_wr(res, 5, 0);		/* Med addr */
229 
230 	port_wr(res, 3, 0x44);		/* Register select */
231 	port_wr(res, 4, 0);		/* High addr */
232 	val = port_rd(res, 7);		/* DRAM */
233 
234 	splx(s);
235 
236 	if (val != 0x55)
237 		goto fail;
238 
239 	rid2 = 0;
240 	res2 = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid2, base, base, 1,
241 				  RF_ACTIVE);
242 
243 	if (res2 == NULL)
244 		goto fail;
245 
246 	s = splhigh();
247 	port_wr(res2, 0x0f, 0x20);
248 	val = port_rd(res2, 0x0f);
249 	splx(s);
250 
251 	if (val == 0xff || (val & 0x06) == 0)
252 		val = 0;
253 	else {
254 		val = port_rd(res2, 0x506);	/* XXX Out of range.  */
255 		if (val == 0xff)
256 			val = 0;
257 	}
258 
259 	bus_release_resource(dev, SYS_RES_IOPORT, rid2, res2);
260 	bus_release_resource(dev, SYS_RES_IOPORT, rid, res);
261 
262 	if (val >= 10) {
263 		struct sndcard_func *func;
264 
265 		/* Looks like a GUS MAX.  Set the rest of the resources.  */
266 
267 		bus_set_resource(dev, SYS_RES_IOPORT, 2, base + 0x10c, 8);
268 
269 		if (flags & DV_F_DUAL_DMA)
270 			bus_set_resource(dev, SYS_RES_DRQ, 1,
271 					 flags & DV_F_DRQ_MASK, 1);
272 
273 		/* We can support the CS4231 and MIDI devices.  */
274 
275 		func = malloc(sizeof(struct sndcard_func), M_DEVBUF, M_NOWAIT | M_ZERO);
276 		if (func == NULL)
277 			return ENOMEM;
278 		func->func = SCF_MIDI;
279 		child = device_add_child(dev, "midi", -1);
280 		device_set_ivars(child, func);
281 
282 		func = malloc(sizeof(struct sndcard_func), M_DEVBUF, M_NOWAIT | M_ZERO);
283 		if (func == NULL)
284 			printf("xxx: gus pcm not attached, out of memory\n");
285 		else {
286 			func->func = SCF_PCM;
287 			child = device_add_child(dev, "pcm", -1);
288 			device_set_ivars(child, func);
289 		}
290 		device_set_desc(dev, "Gravis UltraSound MAX");
291 		return 0;
292 	} else {
293 
294 		/*
295 		 * TODO: Support even older GUS cards.  MIDI should work on
296 		 * all models.
297 		 */
298 		return ENXIO;
299 	}
300 
301 fail:
302 	bus_release_resource(dev, SYS_RES_IOPORT, rid, res);
303 	return ENXIO;
304 }
305 
306 static int
gusc_attach(device_t dev)307 gusc_attach(device_t dev)
308 {
309 	sc_p scp;
310 	void *ih;
311 
312 	scp = device_get_softc(dev);
313 
314 	bzero(scp, sizeof(*scp));
315 
316 	scp->dev = dev;
317 	if (alloc_resource(scp)) {
318 		release_resource(scp);
319 		return (ENXIO);
320 	}
321 
322 	if (scp->irq != NULL)
323 		snd_setup_intr(dev, scp->irq, 0, gusc_intr, scp, &ih);
324 	bus_generic_attach(dev);
325 
326 	return (0);
327 }
328 
329 /*
330  * Handle interrupts on GUS devices until there aren't any left.
331  */
332 static void
gusc_intr(void * arg)333 gusc_intr(void *arg)
334 {
335 	sc_p scp = (sc_p)arg;
336 	int did_something;
337 
338 	do {
339 		did_something = 0;
340 		if (scp->pcm_intr.intr != NULL &&
341 		    (port_rd(scp->io[2], 2) & 1)) {
342 			(*scp->pcm_intr.intr)(scp->pcm_intr.arg);
343 			did_something = 1;
344 		}
345 		if (scp->midi_intr.intr != NULL &&
346 		    (port_rd(scp->io[1], 0) & 0x80)) {
347 			(*scp->midi_intr.intr)(scp->midi_intr.arg);
348 			did_something = 1;
349 		}
350 	} while (did_something != 0);
351 }
352 
353 static struct resource *
gusc_alloc_resource(device_t bus,device_t child,int type,int * rid,rman_res_t start,rman_res_t end,rman_res_t count,u_int flags)354 gusc_alloc_resource(device_t bus, device_t child, int type, int *rid,
355 		    rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
356 {
357 	sc_p scp;
358 	int *alloced, rid_max, alloced_max;
359 	struct resource **res;
360 
361 	scp = device_get_softc(bus);
362 	switch (type) {
363 	case SYS_RES_IOPORT:
364 		alloced = scp->io_alloced;
365 		res = scp->io;
366 		rid_max = 2;
367 		alloced_max = 2; /* pcm + midi (more to include synth) */
368 		break;
369 	case SYS_RES_IRQ:
370 		alloced = &scp->irq_alloced;
371 		res = &scp->irq;
372 		rid_max = 0;
373 		alloced_max = 2; /* pcm and midi share the single irq. */
374 		break;
375 	case SYS_RES_DRQ:
376 		alloced = scp->drq_alloced;
377 		res = scp->drq;
378 		rid_max = 1;
379 		alloced_max = 1;
380 		break;
381 	default:
382 		return (NULL);
383 	}
384 
385 	if (*rid > rid_max || alloced[*rid] == alloced_max)
386 		return (NULL);
387 
388 	alloced[*rid]++;
389 	return (res[*rid]);
390 }
391 
392 static int
gusc_release_resource(device_t bus,device_t child,int type,int rid,struct resource * r)393 gusc_release_resource(device_t bus, device_t child, int type, int rid,
394 			struct resource *r)
395 {
396 	sc_p scp;
397 	int *alloced, rid_max;
398 
399 	scp = device_get_softc(bus);
400 	switch (type) {
401 	case SYS_RES_IOPORT:
402 		alloced = scp->io_alloced;
403 		rid_max = 2;
404 		break;
405 	case SYS_RES_IRQ:
406 		alloced = &scp->irq_alloced;
407 		rid_max = 0;
408 		break;
409 	case SYS_RES_DRQ:
410 		alloced = scp->drq_alloced;
411 		rid_max = 1;
412 		break;
413 	default:
414 		return (1);
415 	}
416 
417 	if (rid > rid_max || alloced[rid] == 0)
418 		return (1);
419 
420 	alloced[rid]--;
421 	return (0);
422 }
423 
424 static int
gusc_setup_intr(device_t dev,device_t child,struct resource * irq,int flags,driver_filter_t * filter,driver_intr_t * intr,void * arg,void ** cookiep)425 gusc_setup_intr(device_t dev, device_t child, struct resource *irq, int flags,
426 		driver_filter_t *filter,
427 		driver_intr_t *intr, void *arg, void **cookiep)
428 {
429 	sc_p scp = (sc_p)device_get_softc(dev);
430 	devclass_t devclass;
431 
432 	if (filter != NULL) {
433 		printf("gusc.c: we cannot use a filter here\n");
434 		return (EINVAL);
435 	}
436 	devclass = device_get_devclass(child);
437 	if (strcmp(devclass_get_name(devclass), "midi") == 0) {
438 		scp->midi_intr.intr = intr;
439 		scp->midi_intr.arg = arg;
440 		return 0;
441 	} else if (strcmp(devclass_get_name(devclass), "pcm") == 0) {
442 		scp->pcm_intr.intr = intr;
443 		scp->pcm_intr.arg = arg;
444 		return 0;
445 	}
446 	return bus_generic_setup_intr(dev, child, irq, flags,
447 				filter,
448 				intr, arg, cookiep);
449 }
450 
451 static device_t
find_masterdev(sc_p scp)452 find_masterdev(sc_p scp)
453 {
454 	int i, units;
455 	devclass_t devclass;
456 	device_t dev;
457 
458 	devclass = device_get_devclass(scp->dev);
459 	units = devclass_get_maxunit(devclass);
460 	dev = NULL;
461 	for (i = 0 ; i < units ; i++) {
462 		dev = devclass_get_device(devclass, i);
463 		if (isa_get_vendorid(dev) == isa_get_vendorid(scp->dev)
464 		    && isa_get_logicalid(dev) == LOGICALID_PCM
465 		    && isa_get_serial(dev) == isa_get_serial(scp->dev))
466 			break;
467 	}
468 	if (i == units)
469 		return (NULL);
470 
471 	return (dev);
472 }
473 
474 static int io_range[3]  = {0x10, 0x8  , 0x4  };
475 static int io_offset[3] = {0x0 , 0x100, 0x10c};
476 static int
alloc_resource(sc_p scp)477 alloc_resource(sc_p scp)
478 {
479 	int i, base, lid, flags;
480 	device_t dev;
481 
482 	flags = 0;
483 	if (isa_get_vendorid(scp->dev))
484 		lid = isa_get_logicalid(scp->dev);
485 	else {
486 		lid = LOGICALID_NOPNP;
487 		flags = device_get_flags(scp->dev);
488 	}
489 	switch(lid) {
490 	case LOGICALID_PCM:
491 	case LOGICALID_NOPNP:		/* XXX Non-PnP */
492 		if (lid == LOGICALID_NOPNP)
493 			base = isa_get_port(scp->dev);
494 		else
495 			base = 0;
496 		for (i = 0 ; i < nitems(scp->io); i++) {
497 			if (scp->io[i] == NULL) {
498 				scp->io_rid[i] = i;
499 				if (base == 0)
500 					scp->io[i] =
501 					    bus_alloc_resource_anywhere(scp->dev,
502 					    	    			SYS_RES_IOPORT,
503 					    	    			&scp->io_rid[i],
504 									io_range[i],
505 									RF_ACTIVE);
506 				else
507 					scp->io[i] = bus_alloc_resource(scp->dev, SYS_RES_IOPORT, &scp->io_rid[i],
508 									base + io_offset[i],
509 									base + io_offset[i] + io_range[i] - 1
510 									, io_range[i], RF_ACTIVE);
511 				if (scp->io[i] == NULL)
512 					return (1);
513 				scp->io_alloced[i] = 0;
514 			}
515 		}
516 		if (scp->irq == NULL) {
517 			scp->irq_rid = 0;
518 			scp->irq =
519 				bus_alloc_resource_any(scp->dev, SYS_RES_IRQ,
520 						       &scp->irq_rid,
521 						       RF_ACTIVE|RF_SHAREABLE);
522 			if (scp->irq == NULL)
523 				return (1);
524 			scp->irq_alloced = 0;
525 		}
526 		for (i = 0 ; i < nitems(scp->drq); i++) {
527 			if (scp->drq[i] == NULL) {
528 				scp->drq_rid[i] = i;
529 				if (base == 0 || i == 0)
530 					scp->drq[i] =
531 						bus_alloc_resource_any(
532 							scp->dev, SYS_RES_DRQ,
533 							&scp->drq_rid[i],
534 							RF_ACTIVE);
535 				else if ((flags & DV_F_DUAL_DMA) != 0)
536 					/* XXX The secondary drq is specified in the flag. */
537 					scp->drq[i] = bus_alloc_resource(scp->dev, SYS_RES_DRQ, &scp->drq_rid[i],
538 									 flags & DV_F_DRQ_MASK,
539 									 flags & DV_F_DRQ_MASK, 1, RF_ACTIVE);
540 				if (scp->drq[i] == NULL)
541 					return (1);
542 				scp->drq_alloced[i] = 0;
543 			}
544 		}
545 		break;
546 	case LOGICALID_OPL:
547 		if (scp->io[0] == NULL) {
548 			scp->io_rid[0] = 0;
549 			scp->io[0] = bus_alloc_resource_anywhere(scp->dev,
550 								 SYS_RES_IOPORT,
551 								 &scp->io_rid[0],
552 								 io_range[0],
553 								 RF_ACTIVE);
554 			if (scp->io[0] == NULL)
555 				return (1);
556 			scp->io_alloced[0] = 0;
557 		}
558 		break;
559 	case LOGICALID_MIDI:
560 		if (scp->io[0] == NULL) {
561 			scp->io_rid[0] = 0;
562 			scp->io[0] = bus_alloc_resource_anywhere(scp->dev,
563 								 SYS_RES_IOPORT,
564 								 &scp->io_rid[0],
565 								 io_range[0],
566 								 RF_ACTIVE);
567 			if (scp->io[0] == NULL)
568 				return (1);
569 			scp->io_alloced[0] = 0;
570 		}
571 		if (scp->irq == NULL) {
572 			/* The irq is shared with pcm audio. */
573 			dev = find_masterdev(scp);
574 			if (dev == NULL)
575 				return (1);
576 			scp->irq_rid = 0;
577 			scp->irq = BUS_ALLOC_RESOURCE(dev, NULL, SYS_RES_IRQ, &scp->irq_rid,
578 						      0, ~0, 1, RF_ACTIVE | RF_SHAREABLE);
579 			if (scp->irq == NULL)
580 				return (1);
581 			scp->irq_alloced = 0;
582 		}
583 		break;
584 	}
585 	return (0);
586 }
587 
588 static int
release_resource(sc_p scp)589 release_resource(sc_p scp)
590 {
591 	int i, lid;
592 	device_t dev;
593 
594 	if (isa_get_vendorid(scp->dev))
595 		lid = isa_get_logicalid(scp->dev);
596 	else
597 		lid = LOGICALID_NOPNP;
598 
599 	switch(lid) {
600 	case LOGICALID_PCM:
601 	case LOGICALID_NOPNP:		/* XXX Non-PnP */
602 		for (i = 0 ; i < nitems(scp->io); i++) {
603 			if (scp->io[i] != NULL) {
604 				bus_release_resource(scp->dev, SYS_RES_IOPORT, scp->io_rid[i], scp->io[i]);
605 				scp->io[i] = NULL;
606 			}
607 		}
608 		if (scp->irq != NULL) {
609 			bus_release_resource(scp->dev, SYS_RES_IRQ, scp->irq_rid, scp->irq);
610 			scp->irq = NULL;
611 		}
612 		for (i = 0 ; i < nitems(scp->drq); i++) {
613 			if (scp->drq[i] != NULL) {
614 				bus_release_resource(scp->dev, SYS_RES_DRQ, scp->drq_rid[i], scp->drq[i]);
615 				scp->drq[i] = NULL;
616 			}
617 		}
618 		break;
619 	case LOGICALID_OPL:
620 		if (scp->io[0] != NULL) {
621 			bus_release_resource(scp->dev, SYS_RES_IOPORT, scp->io_rid[0], scp->io[0]);
622 			scp->io[0] = NULL;
623 		}
624 		break;
625 	case LOGICALID_MIDI:
626 		if (scp->io[0] != NULL) {
627 			bus_release_resource(scp->dev, SYS_RES_IOPORT, scp->io_rid[0], scp->io[0]);
628 			scp->io[0] = NULL;
629 		}
630 		if (scp->irq != NULL) {
631 			/* The irq is shared with pcm audio. */
632 			dev = find_masterdev(scp);
633 			if (dev == NULL)
634 				return (1);
635 			BUS_RELEASE_RESOURCE(dev, NULL, SYS_RES_IOPORT, scp->irq_rid, scp->irq);
636 			scp->irq = NULL;
637 		}
638 		break;
639 	}
640 	return (0);
641 }
642 
643 static device_method_t gusc_methods[] = {
644 	/* Device interface */
645 	DEVMETHOD(device_probe,		gusc_probe),
646 	DEVMETHOD(device_attach,	gusc_attach),
647 	DEVMETHOD(device_detach,	bus_generic_detach),
648 	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
649 	DEVMETHOD(device_suspend,	bus_generic_suspend),
650 	DEVMETHOD(device_resume,	bus_generic_resume),
651 
652 	/* Bus interface */
653 	DEVMETHOD(bus_alloc_resource,	gusc_alloc_resource),
654 	DEVMETHOD(bus_release_resource,	gusc_release_resource),
655 	DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
656 	DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
657 	DEVMETHOD(bus_setup_intr,	gusc_setup_intr),
658 	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
659 
660 	DEVMETHOD_END
661 };
662 
663 static driver_t gusc_driver = {
664 	"gusc",
665 	gusc_methods,
666 	sizeof(struct gusc_softc),
667 };
668 
669 /*
670  * gusc can be attached to an isa bus.
671  */
672 DRIVER_MODULE(snd_gusc, isa, gusc_driver, gusc_devclass, 0, 0);
673 DRIVER_MODULE(snd_gusc, acpi, gusc_driver, gusc_devclass, 0, 0);
674 MODULE_DEPEND(snd_gusc, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
675 MODULE_VERSION(snd_gusc, 1);
676 ISA_PNP_INFO(gusc_ids);
677