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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * MOTU Midi Timepiece ALSA Main routines
4 * Copyright by Michael T. Mayers (c) Jan 09, 2000
5 * mail: [email protected]
6 * Thanks to John Galbraith
7 *
8 * This driver is for the 'Mark Of The Unicorn' (MOTU)
9 * MidiTimePiece AV multiport MIDI interface
10 *
11 * IOPORTS
12 * -------
13 * 8 MIDI Ins and 8 MIDI outs
14 * Video Sync In (BNC), Word Sync Out (BNC),
15 * ADAT Sync Out (DB9)
16 * SMPTE in/out (1/4")
17 * 2 programmable pedal/footswitch inputs and 4 programmable MIDI controller knobs.
18 * Macintosh RS422 serial port
19 * RS422 "network" port for ganging multiple MTP's
20 * PC Parallel Port ( which this driver currently uses )
21 *
22 * MISC FEATURES
23 * -------------
24 * Hardware MIDI routing, merging, and filtering
25 * MIDI Synchronization to Video, ADAT, SMPTE and other Clock sources
26 * 128 'scene' memories, recallable from MIDI program change
27 *
28 * ChangeLog
29 * Jun 11 2001 Takashi Iwai <[email protected]>
30 * - Recoded & debugged
31 * - Added timer interrupt for midi outputs
32 * - hwports is between 1 and 8, which specifies the number of hardware ports.
33 * The three global ports, computer, adat and broadcast ports, are created
34 * always after h/w and remote ports.
35 */
36
37#include <linux/init.h>
38#include <linux/interrupt.h>
39#include <linux/module.h>
40#include <linux/err.h>
41#include <linux/platform_device.h>
42#include <linux/ioport.h>
43#include <linux/io.h>
44#include <linux/moduleparam.h>
45#include <sound/core.h>
46#include <sound/initval.h>
47#include <sound/rawmidi.h>
48#include <linux/delay.h>
49#include <linux/string.h>
50
51/*
52 * globals
53 */
54MODULE_AUTHOR("Michael T. Mayers");
55MODULE_DESCRIPTION("MOTU MidiTimePiece AV multiport MIDI");
56MODULE_LICENSE("GPL");
57
58// io resources
59#define MTPAV_IOBASE 0x378
60#define MTPAV_IRQ 7
61#define MTPAV_MAX_PORTS 8
62
63static int index = SNDRV_DEFAULT_IDX1;
64static char *id = SNDRV_DEFAULT_STR1;
65static long port = MTPAV_IOBASE; /* 0x378, 0x278 */
66static int irq = MTPAV_IRQ; /* 7, 5 */
67static int hwports = MTPAV_MAX_PORTS; /* use hardware ports 1-8 */
68
69module_param(index, int, 0444);
70MODULE_PARM_DESC(index, "Index value for MotuMTPAV MIDI.");
71module_param(id, charp, 0444);
72MODULE_PARM_DESC(id, "ID string for MotuMTPAV MIDI.");
73module_param_hw(port, long, ioport, 0444);
74MODULE_PARM_DESC(port, "Parallel port # for MotuMTPAV MIDI.");
75module_param_hw(irq, int, irq, 0444);
76MODULE_PARM_DESC(irq, "Parallel IRQ # for MotuMTPAV MIDI.");
77module_param(hwports, int, 0444);
78MODULE_PARM_DESC(hwports, "Hardware ports # for MotuMTPAV MIDI.");
79
80static struct platform_device *device;
81
82/*
83 * defines
84 */
85//#define USE_FAKE_MTP // don't actually read/write to MTP device (for debugging without an actual unit) (does not work yet)
86
87// parallel port usage masks
88#define SIGS_BYTE 0x08
89#define SIGS_RFD 0x80
90#define SIGS_IRQ 0x40
91#define SIGS_IN0 0x10
92#define SIGS_IN1 0x20
93
94#define SIGC_WRITE 0x04
95#define SIGC_READ 0x08
96#define SIGC_INTEN 0x10
97
98#define DREG 0
99#define SREG 1
100#define CREG 2
101
102//
103#define MTPAV_MODE_INPUT_OPENED 0x01
104#define MTPAV_MODE_OUTPUT_OPENED 0x02
105#define MTPAV_MODE_INPUT_TRIGGERED 0x04
106#define MTPAV_MODE_OUTPUT_TRIGGERED 0x08
107
108#define NUMPORTS (0x12+1)
109
110
111/*
112 */
113
114struct mtpav_port {
115 u8 number;
116 u8 hwport;
117 u8 mode;
118 u8 running_status;
119 struct snd_rawmidi_substream *input;
120 struct snd_rawmidi_substream *output;
121};
122
123struct mtpav {
124 struct snd_card *card;
125 unsigned long port;
126 struct resource *res_port;
127 int irq; /* interrupt (for inputs) */
128 spinlock_t spinlock;
129 int share_irq; /* number of accesses to input interrupts */
130 int istimer; /* number of accesses to timer interrupts */
131 struct timer_list timer; /* timer interrupts for outputs */
132 struct snd_rawmidi *rmidi;
133 int num_ports; /* number of hw ports (1-8) */
134 struct mtpav_port ports[NUMPORTS]; /* all ports including computer, adat and bc */
135
136 u32 inmidiport; /* selected input midi port */
137 u32 inmidistate; /* during midi command 0xf5 */
138
139 u32 outmidihwport; /* selected output midi hw port */
140};
141
142
143/*
144 * possible hardware ports (selected by 0xf5 port message)
145 * 0x00 all ports
146 * 0x01 .. 0x08 this MTP's ports 1..8
147 * 0x09 .. 0x10 networked MTP's ports (9..16)
148 * 0x11 networked MTP's computer port
149 * 0x63 to ADAT
150 *
151 * mappig:
152 * subdevice 0 - (X-1) ports
153 * X - (2*X-1) networked ports
154 * X computer
155 * X+1 ADAT
156 * X+2 all ports
157 *
158 * where X = chip->num_ports
159 */
160
161#define MTPAV_PIDX_COMPUTER 0
162#define MTPAV_PIDX_ADAT 1
163#define MTPAV_PIDX_BROADCAST 2
164
165
166static int translate_subdevice_to_hwport(struct mtpav *chip, int subdev)
167{
168 if (subdev < 0)
169 return 0x01; /* invalid - use port 0 as default */
170 else if (subdev < chip->num_ports)
171 return subdev + 1; /* single mtp port */
172 else if (subdev < chip->num_ports * 2)
173 return subdev - chip->num_ports + 0x09; /* remote port */
174 else if (subdev == chip->num_ports * 2 + MTPAV_PIDX_COMPUTER)
175 return 0x11; /* computer port */
176 else if (subdev == chip->num_ports + MTPAV_PIDX_ADAT)
177 return 0x63; /* ADAT */
178 return 0; /* all ports */
179}
180
181static int translate_hwport_to_subdevice(struct mtpav *chip, int hwport)
182{
183 int p;
184 if (hwport <= 0x00) /* all ports */
185 return chip->num_ports + MTPAV_PIDX_BROADCAST;
186 else if (hwport <= 0x08) { /* single port */
187 p = hwport - 1;
188 if (p >= chip->num_ports)
189 p = 0;
190 return p;
191 } else if (hwport <= 0x10) { /* remote port */
192 p = hwport - 0x09 + chip->num_ports;
193 if (p >= chip->num_ports * 2)
194 p = chip->num_ports;
195 return p;
196 } else if (hwport == 0x11) /* computer port */
197 return chip->num_ports + MTPAV_PIDX_COMPUTER;
198 else /* ADAT */
199 return chip->num_ports + MTPAV_PIDX_ADAT;
200}
201
202
203/*
204 */
205
206static u8 snd_mtpav_getreg(struct mtpav *chip, u16 reg)
207{
208 u8 rval = 0;
209
210 if (reg == SREG) {
211 rval = inb(chip->port + SREG);
212 rval = (rval & 0xf8);
213 } else if (reg == CREG) {
214 rval = inb(chip->port + CREG);
215 rval = (rval & 0x1c);
216 }
217
218 return rval;
219}
220
221/*
222 */
223
224static inline void snd_mtpav_mputreg(struct mtpav *chip, u16 reg, u8 val)
225{
226 if (reg == DREG || reg == CREG)
227 outb(val, chip->port + reg);
228}
229
230/*
231 */
232
233static void snd_mtpav_wait_rfdhi(struct mtpav *chip)
234{
235 int counts = 10000;
236 u8 sbyte;
237
238 sbyte = snd_mtpav_getreg(chip, SREG);
239 while (!(sbyte & SIGS_RFD) && counts--) {
240 sbyte = snd_mtpav_getreg(chip, SREG);
241 udelay(10);
242 }
243}
244
245static void snd_mtpav_send_byte(struct mtpav *chip, u8 byte)
246{
247 u8 tcbyt;
248 u8 clrwrite;
249 u8 setwrite;
250
251 snd_mtpav_wait_rfdhi(chip);
252
253 /////////////////
254
255 tcbyt = snd_mtpav_getreg(chip, CREG);
256 clrwrite = tcbyt & (SIGC_WRITE ^ 0xff);
257 setwrite = tcbyt | SIGC_WRITE;
258
259 snd_mtpav_mputreg(chip, DREG, byte);
260 snd_mtpav_mputreg(chip, CREG, clrwrite); // clear write bit
261
262 snd_mtpav_mputreg(chip, CREG, setwrite); // set write bit
263
264}
265
266
267/*
268 */
269
270/* call this with spin lock held */
271static void snd_mtpav_output_port_write(struct mtpav *mtp_card,
272 struct mtpav_port *portp,
273 struct snd_rawmidi_substream *substream)
274{
275 u8 outbyte;
276
277 // Get the outbyte first, so we can emulate running status if
278 // necessary
279 if (snd_rawmidi_transmit(substream, &outbyte, 1) != 1)
280 return;
281
282 // send port change command if necessary
283
284 if (portp->hwport != mtp_card->outmidihwport) {
285 mtp_card->outmidihwport = portp->hwport;
286
287 snd_mtpav_send_byte(mtp_card, 0xf5);
288 snd_mtpav_send_byte(mtp_card, portp->hwport);
289 if (!(outbyte & 0x80) && portp->running_status)
290 snd_mtpav_send_byte(mtp_card, portp->running_status);
291 }
292
293 // send data
294
295 do {
296 if (outbyte & 0x80)
297 portp->running_status = outbyte;
298
299 snd_mtpav_send_byte(mtp_card, outbyte);
300 } while (snd_rawmidi_transmit(substream, &outbyte, 1) == 1);
301}
302
303static void snd_mtpav_output_write(struct snd_rawmidi_substream *substream)
304{
305 struct mtpav *mtp_card = substream->rmidi->private_data;
306 struct mtpav_port *portp = &mtp_card->ports[substream->number];
307
308 guard(spinlock_irqsave)(&mtp_card->spinlock);
309 snd_mtpav_output_port_write(mtp_card, portp, substream);
310}
311
312
313/*
314 * mtpav control
315 */
316
317static void snd_mtpav_portscan(struct mtpav *chip) // put mtp into smart routing mode
318{
319 u8 p;
320
321 for (p = 0; p < 8; p++) {
322 snd_mtpav_send_byte(chip, 0xf5);
323 snd_mtpav_send_byte(chip, p);
324 snd_mtpav_send_byte(chip, 0xfe);
325 }
326}
327
328/*
329 */
330
331static int snd_mtpav_input_open(struct snd_rawmidi_substream *substream)
332{
333 struct mtpav *mtp_card = substream->rmidi->private_data;
334 struct mtpav_port *portp = &mtp_card->ports[substream->number];
335
336 guard(spinlock_irqsave)(&mtp_card->spinlock);
337 portp->mode |= MTPAV_MODE_INPUT_OPENED;
338 portp->input = substream;
339 if (mtp_card->share_irq++ == 0)
340 snd_mtpav_mputreg(mtp_card, CREG, (SIGC_INTEN | SIGC_WRITE)); // enable pport interrupts
341 return 0;
342}
343
344/*
345 */
346
347static int snd_mtpav_input_close(struct snd_rawmidi_substream *substream)
348{
349 struct mtpav *mtp_card = substream->rmidi->private_data;
350 struct mtpav_port *portp = &mtp_card->ports[substream->number];
351
352 guard(spinlock_irqsave)(&mtp_card->spinlock);
353 portp->mode &= ~MTPAV_MODE_INPUT_OPENED;
354 portp->input = NULL;
355 if (--mtp_card->share_irq == 0)
356 snd_mtpav_mputreg(mtp_card, CREG, 0); // disable pport interrupts
357 return 0;
358}
359
360/*
361 */
362
363static void snd_mtpav_input_trigger(struct snd_rawmidi_substream *substream, int up)
364{
365 struct mtpav *mtp_card = substream->rmidi->private_data;
366 struct mtpav_port *portp = &mtp_card->ports[substream->number];
367
368 guard(spinlock_irqsave)(&mtp_card->spinlock);
369 if (up)
370 portp->mode |= MTPAV_MODE_INPUT_TRIGGERED;
371 else
372 portp->mode &= ~MTPAV_MODE_INPUT_TRIGGERED;
373}
374
375
376/*
377 * timer interrupt for outputs
378 */
379
380static void snd_mtpav_output_timer(struct timer_list *t)
381{
382 struct mtpav *chip = timer_container_of(chip, t, timer);
383 int p;
384
385 guard(spinlock_irqsave)(&chip->spinlock);
386 /* reprogram timer */
387 mod_timer(&chip->timer, 1 + jiffies);
388 /* process each port */
389 for (p = 0; p <= chip->num_ports * 2 + MTPAV_PIDX_BROADCAST; p++) {
390 struct mtpav_port *portp = &chip->ports[p];
391 if ((portp->mode & MTPAV_MODE_OUTPUT_TRIGGERED) && portp->output)
392 snd_mtpav_output_port_write(chip, portp, portp->output);
393 }
394}
395
396/* spinlock held! */
397static void snd_mtpav_add_output_timer(struct mtpav *chip)
398{
399 mod_timer(&chip->timer, 1 + jiffies);
400}
401
402/* spinlock held! */
403static void snd_mtpav_remove_output_timer(struct mtpav *chip)
404{
405 timer_delete(&chip->timer);
406}
407
408/*
409 */
410
411static int snd_mtpav_output_open(struct snd_rawmidi_substream *substream)
412{
413 struct mtpav *mtp_card = substream->rmidi->private_data;
414 struct mtpav_port *portp = &mtp_card->ports[substream->number];
415
416 guard(spinlock_irqsave)(&mtp_card->spinlock);
417 portp->mode |= MTPAV_MODE_OUTPUT_OPENED;
418 portp->output = substream;
419 return 0;
420};
421
422/*
423 */
424
425static int snd_mtpav_output_close(struct snd_rawmidi_substream *substream)
426{
427 struct mtpav *mtp_card = substream->rmidi->private_data;
428 struct mtpav_port *portp = &mtp_card->ports[substream->number];
429
430 guard(spinlock_irqsave)(&mtp_card->spinlock);
431 portp->mode &= ~MTPAV_MODE_OUTPUT_OPENED;
432 portp->output = NULL;
433 return 0;
434};
435
436/*
437 */
438
439static void snd_mtpav_output_trigger(struct snd_rawmidi_substream *substream, int up)
440{
441 struct mtpav *mtp_card = substream->rmidi->private_data;
442 struct mtpav_port *portp = &mtp_card->ports[substream->number];
443
444 scoped_guard(spinlock_irqsave, &mtp_card->spinlock) {
445 if (up) {
446 if ((portp->mode & MTPAV_MODE_OUTPUT_TRIGGERED)) {
447 if (mtp_card->istimer++ == 0)
448 snd_mtpav_add_output_timer(mtp_card);
449 portp->mode |= MTPAV_MODE_OUTPUT_TRIGGERED;
450 }
451 } else {
452 portp->mode &= ~MTPAV_MODE_OUTPUT_TRIGGERED;
453 if (--mtp_card->istimer == 0)
454 snd_mtpav_remove_output_timer(mtp_card);
455 }
456 }
457
458 if (up)
459 snd_mtpav_output_write(substream);
460}
461
462/*
463 * midi interrupt for inputs
464 */
465
466static void snd_mtpav_inmidi_process(struct mtpav *mcrd, u8 inbyte)
467{
468 struct mtpav_port *portp;
469
470 if ((int)mcrd->inmidiport > mcrd->num_ports * 2 + MTPAV_PIDX_BROADCAST)
471 return;
472
473 portp = &mcrd->ports[mcrd->inmidiport];
474 if (portp->mode & MTPAV_MODE_INPUT_TRIGGERED)
475 snd_rawmidi_receive(portp->input, &inbyte, 1);
476}
477
478static void snd_mtpav_inmidi_h(struct mtpav *mcrd, u8 inbyte)
479{
480 if (inbyte >= 0xf8) {
481 /* real-time midi code */
482 snd_mtpav_inmidi_process(mcrd, inbyte);
483 return;
484 }
485
486 if (mcrd->inmidistate == 0) { // awaiting command
487 if (inbyte == 0xf5) // MTP port #
488 mcrd->inmidistate = 1;
489 else
490 snd_mtpav_inmidi_process(mcrd, inbyte);
491 } else if (mcrd->inmidistate) {
492 mcrd->inmidiport = translate_hwport_to_subdevice(mcrd, inbyte);
493 mcrd->inmidistate = 0;
494 }
495}
496
497static void snd_mtpav_read_bytes(struct mtpav *mcrd)
498{
499 u8 clrread, setread;
500 u8 mtp_read_byte;
501 u8 sr, cbyt;
502 int i;
503
504 u8 sbyt = snd_mtpav_getreg(mcrd, SREG);
505
506 if (!(sbyt & SIGS_BYTE))
507 return;
508
509 cbyt = snd_mtpav_getreg(mcrd, CREG);
510 clrread = cbyt & (SIGC_READ ^ 0xff);
511 setread = cbyt | SIGC_READ;
512
513 do {
514
515 mtp_read_byte = 0;
516 for (i = 0; i < 4; i++) {
517 snd_mtpav_mputreg(mcrd, CREG, setread);
518 sr = snd_mtpav_getreg(mcrd, SREG);
519 snd_mtpav_mputreg(mcrd, CREG, clrread);
520
521 sr &= SIGS_IN0 | SIGS_IN1;
522 sr >>= 4;
523 mtp_read_byte |= sr << (i * 2);
524 }
525
526 snd_mtpav_inmidi_h(mcrd, mtp_read_byte);
527
528 sbyt = snd_mtpav_getreg(mcrd, SREG);
529
530 } while (sbyt & SIGS_BYTE);
531}
532
533static irqreturn_t snd_mtpav_irqh(int irq, void *dev_id)
534{
535 struct mtpav *mcard = dev_id;
536
537 guard(spinlock)(&mcard->spinlock);
538 snd_mtpav_read_bytes(mcard);
539 return IRQ_HANDLED;
540}
541
542/*
543 * get ISA resources
544 */
545static int snd_mtpav_get_ISA(struct mtpav *mcard)
546{
547 mcard->res_port = devm_request_region(mcard->card->dev, port, 3,
548 "MotuMTPAV MIDI");
549 if (!mcard->res_port) {
550 dev_err(mcard->card->dev, "MTVAP port 0x%lx is busy\n", port);
551 return -EBUSY;
552 }
553 mcard->port = port;
554 if (devm_request_irq(mcard->card->dev, irq, snd_mtpav_irqh, 0,
555 "MOTU MTPAV", mcard)) {
556 dev_err(mcard->card->dev, "MTVAP IRQ %d busy\n", irq);
557 return -EBUSY;
558 }
559 mcard->irq = irq;
560 return 0;
561}
562
563
564/*
565 */
566
567static const struct snd_rawmidi_ops snd_mtpav_output = {
568 .open = snd_mtpav_output_open,
569 .close = snd_mtpav_output_close,
570 .trigger = snd_mtpav_output_trigger,
571};
572
573static const struct snd_rawmidi_ops snd_mtpav_input = {
574 .open = snd_mtpav_input_open,
575 .close = snd_mtpav_input_close,
576 .trigger = snd_mtpav_input_trigger,
577};
578
579
580/*
581 * get RAWMIDI resources
582 */
583
584static void snd_mtpav_set_name(struct mtpav *chip,
585 struct snd_rawmidi_substream *substream)
586{
587 if (substream->number >= 0 && substream->number < chip->num_ports)
588 sprintf(substream->name, "MTP direct %d", (substream->number % chip->num_ports) + 1);
589 else if (substream->number >= 8 && substream->number < chip->num_ports * 2)
590 sprintf(substream->name, "MTP remote %d", (substream->number % chip->num_ports) + 1);
591 else if (substream->number == chip->num_ports * 2)
592 strscpy(substream->name, "MTP computer");
593 else if (substream->number == chip->num_ports * 2 + 1)
594 strscpy(substream->name, "MTP ADAT");
595 else
596 strscpy(substream->name, "MTP broadcast");
597}
598
599static int snd_mtpav_get_RAWMIDI(struct mtpav *mcard)
600{
601 int rval;
602 struct snd_rawmidi *rawmidi;
603 struct snd_rawmidi_substream *substream;
604 struct list_head *list;
605
606 if (hwports < 1)
607 hwports = 1;
608 else if (hwports > 8)
609 hwports = 8;
610 mcard->num_ports = hwports;
611
612 rval = snd_rawmidi_new(mcard->card, "MotuMIDI", 0,
613 mcard->num_ports * 2 + MTPAV_PIDX_BROADCAST + 1,
614 mcard->num_ports * 2 + MTPAV_PIDX_BROADCAST + 1,
615 &mcard->rmidi);
616 if (rval < 0)
617 return rval;
618 rawmidi = mcard->rmidi;
619 rawmidi->private_data = mcard;
620
621 list_for_each(list, &rawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
622 substream = list_entry(list, struct snd_rawmidi_substream, list);
623 snd_mtpav_set_name(mcard, substream);
624 substream->ops = &snd_mtpav_input;
625 }
626 list_for_each(list, &rawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
627 substream = list_entry(list, struct snd_rawmidi_substream, list);
628 snd_mtpav_set_name(mcard, substream);
629 substream->ops = &snd_mtpav_output;
630 mcard->ports[substream->number].hwport = translate_subdevice_to_hwport(mcard, substream->number);
631 }
632 rawmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT | SNDRV_RAWMIDI_INFO_INPUT |
633 SNDRV_RAWMIDI_INFO_DUPLEX;
634 sprintf(rawmidi->name, "MTP AV MIDI");
635 return 0;
636}
637
638/*
639 */
640
641static void snd_mtpav_free(struct snd_card *card)
642{
643 struct mtpav *crd = card->private_data;
644
645 timer_shutdown_sync(&crd->timer);
646}
647
648/*
649 */
650static int snd_mtpav_probe(struct platform_device *dev)
651{
652 struct snd_card *card;
653 int err;
654 struct mtpav *mtp_card;
655
656 err = snd_devm_card_new(&dev->dev, index, id, THIS_MODULE,
657 sizeof(*mtp_card), &card);
658 if (err < 0)
659 return err;
660
661 mtp_card = card->private_data;
662 spin_lock_init(&mtp_card->spinlock);
663 mtp_card->card = card;
664 mtp_card->irq = -1;
665 mtp_card->share_irq = 0;
666 mtp_card->inmidistate = 0;
667 mtp_card->outmidihwport = 0xffffffff;
668 timer_setup(&mtp_card->timer, snd_mtpav_output_timer, 0);
669
670 err = snd_mtpav_get_RAWMIDI(mtp_card);
671 if (err < 0)
672 return err;
673
674 mtp_card->inmidiport = mtp_card->num_ports + MTPAV_PIDX_BROADCAST;
675
676 err = snd_mtpav_get_ISA(mtp_card);
677 if (err < 0)
678 return err;
679
680 strscpy(card->driver, "MTPAV");
681 strscpy(card->shortname, "MTPAV on parallel port");
682 snprintf(card->longname, sizeof(card->longname),
683 "MTPAV on parallel port at 0x%lx", port);
684
685 snd_mtpav_portscan(mtp_card);
686
687 err = snd_card_register(mtp_card->card);
688 if (err < 0)
689 return err;
690
691 card->private_free = snd_mtpav_free;
692
693 platform_set_drvdata(dev, card);
694 dev_info(card->dev,
695 "Motu MidiTimePiece on parallel port irq: %d ioport: 0x%lx\n",
696 irq, port);
697 return 0;
698}
699
700#define SND_MTPAV_DRIVER "snd_mtpav"
701
702static struct platform_driver snd_mtpav_driver = {
703 .probe = snd_mtpav_probe,
704 .driver = {
705 .name = SND_MTPAV_DRIVER,
706 },
707};
708
709static int __init alsa_card_mtpav_init(void)
710{
711 int err;
712
713 err = platform_driver_register(&snd_mtpav_driver);
714 if (err < 0)
715 return err;
716
717 device = platform_device_register_simple(SND_MTPAV_DRIVER, -1, NULL, 0);
718 if (!IS_ERR(device)) {
719 if (platform_get_drvdata(device))
720 return 0;
721 platform_device_unregister(device);
722 err = -ENODEV;
723 } else
724 err = PTR_ERR(device);
725 platform_driver_unregister(&snd_mtpav_driver);
726 return err;
727}
728
729static void __exit alsa_card_mtpav_exit(void)
730{
731 platform_device_unregister(device);
732 platform_driver_unregister(&snd_mtpav_driver);
733}
734
735module_init(alsa_card_mtpav_init)
736module_exit(alsa_card_mtpav_exit)