1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Routines for control of MPU-401 in UART mode
5 *
6 * MPU-401 supports UART mode which is not capable generate transmit
7 * interrupts thus output is done via polling. Without interrupt,
8 * input is done also via polling. Do not expect good performance.
9 *
10 * 13-03-2003:
11 * Added support for different kind of hardware I/O. Build in choices
12 * are port and mmio. For other kind of I/O, set mpu->read and
13 * mpu->write to your own I/O functions.
14 */
15
16 #include <linux/io.h>
17 #include <linux/delay.h>
18 #include <linux/init.h>
19 #include <linux/slab.h>
20 #include <linux/ioport.h>
21 #include <linux/module.h>
22 #include <linux/interrupt.h>
23 #include <linux/errno.h>
24 #include <sound/core.h>
25 #include <sound/mpu401.h>
26
27 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
28 MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
29 MODULE_LICENSE("GPL");
30
31 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
32 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
33
34 /*
35
36 */
37
38 #define snd_mpu401_input_avail(mpu) \
39 (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
40 #define snd_mpu401_output_ready(mpu) \
41 (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
42
43 /* Build in lowlevel io */
mpu401_write_port(struct snd_mpu401 * mpu,unsigned char data,unsigned long addr)44 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
45 unsigned long addr)
46 {
47 outb(data, addr);
48 }
49
mpu401_read_port(struct snd_mpu401 * mpu,unsigned long addr)50 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
51 unsigned long addr)
52 {
53 return inb(addr);
54 }
55
mpu401_write_mmio(struct snd_mpu401 * mpu,unsigned char data,unsigned long addr)56 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
57 unsigned long addr)
58 {
59 writeb(data, (void __iomem *)addr);
60 }
61
mpu401_read_mmio(struct snd_mpu401 * mpu,unsigned long addr)62 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
63 unsigned long addr)
64 {
65 return readb((void __iomem *)addr);
66 }
67 /* */
68
snd_mpu401_uart_clear_rx(struct snd_mpu401 * mpu)69 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
70 {
71 int timeout = 100000;
72 for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
73 mpu->read(mpu, MPU401D(mpu));
74 #ifdef CONFIG_SND_DEBUG
75 if (timeout <= 0)
76 dev_err(mpu->rmidi->dev,
77 "cmd: clear rx timeout (status = 0x%x)\n",
78 mpu->read(mpu, MPU401C(mpu)));
79 #endif
80 }
81
uart_interrupt_tx(struct snd_mpu401 * mpu)82 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
83 {
84 unsigned long flags;
85
86 if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
87 test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
88 spin_lock_irqsave(&mpu->output_lock, flags);
89 snd_mpu401_uart_output_write(mpu);
90 spin_unlock_irqrestore(&mpu->output_lock, flags);
91 }
92 }
93
_snd_mpu401_uart_interrupt(struct snd_mpu401 * mpu)94 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
95 {
96 unsigned long flags;
97
98 if (mpu->info_flags & MPU401_INFO_INPUT) {
99 spin_lock_irqsave(&mpu->input_lock, flags);
100 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
101 snd_mpu401_uart_input_read(mpu);
102 else
103 snd_mpu401_uart_clear_rx(mpu);
104 spin_unlock_irqrestore(&mpu->input_lock, flags);
105 }
106 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
107 /* ok. for better Tx performance try do some output
108 when input is done */
109 uart_interrupt_tx(mpu);
110 }
111
112 /**
113 * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
114 * @irq: the irq number
115 * @dev_id: mpu401 instance
116 *
117 * Processes the interrupt for MPU401-UART i/o.
118 *
119 * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
120 */
snd_mpu401_uart_interrupt(int irq,void * dev_id)121 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
122 {
123 struct snd_mpu401 *mpu = dev_id;
124
125 if (!mpu)
126 return IRQ_NONE;
127 _snd_mpu401_uart_interrupt(mpu);
128 return IRQ_HANDLED;
129 }
130
131 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
132
133 /**
134 * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
135 * @irq: the irq number
136 * @dev_id: mpu401 instance
137 *
138 * Processes the interrupt for MPU401-UART output.
139 *
140 * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
141 */
snd_mpu401_uart_interrupt_tx(int irq,void * dev_id)142 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
143 {
144 struct snd_mpu401 *mpu = dev_id;
145
146 if (!mpu)
147 return IRQ_NONE;
148 uart_interrupt_tx(mpu);
149 return IRQ_HANDLED;
150 }
151
152 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
153
154 /*
155 * timer callback
156 * reprogram the timer and call the interrupt job
157 */
snd_mpu401_uart_timer(struct timer_list * t)158 static void snd_mpu401_uart_timer(struct timer_list *t)
159 {
160 struct snd_mpu401 *mpu = from_timer(mpu, t, timer);
161 unsigned long flags;
162
163 spin_lock_irqsave(&mpu->timer_lock, flags);
164 /*mpu->mode |= MPU401_MODE_TIMER;*/
165 mod_timer(&mpu->timer, 1 + jiffies);
166 spin_unlock_irqrestore(&mpu->timer_lock, flags);
167 if (mpu->rmidi)
168 _snd_mpu401_uart_interrupt(mpu);
169 }
170
171 /*
172 * initialize the timer callback if not programmed yet
173 */
snd_mpu401_uart_add_timer(struct snd_mpu401 * mpu,int input)174 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
175 {
176 unsigned long flags;
177
178 spin_lock_irqsave (&mpu->timer_lock, flags);
179 if (mpu->timer_invoked == 0) {
180 timer_setup(&mpu->timer, snd_mpu401_uart_timer, 0);
181 mod_timer(&mpu->timer, 1 + jiffies);
182 }
183 mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
184 MPU401_MODE_OUTPUT_TIMER;
185 spin_unlock_irqrestore (&mpu->timer_lock, flags);
186 }
187
188 /*
189 * remove the timer callback if still active
190 */
snd_mpu401_uart_remove_timer(struct snd_mpu401 * mpu,int input)191 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
192 {
193 unsigned long flags;
194
195 spin_lock_irqsave (&mpu->timer_lock, flags);
196 if (mpu->timer_invoked) {
197 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
198 ~MPU401_MODE_OUTPUT_TIMER;
199 if (! mpu->timer_invoked)
200 del_timer(&mpu->timer);
201 }
202 spin_unlock_irqrestore (&mpu->timer_lock, flags);
203 }
204
205 /*
206 * send a UART command
207 * return zero if successful, non-zero for some errors
208 */
209
snd_mpu401_uart_cmd(struct snd_mpu401 * mpu,unsigned char cmd,int ack)210 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
211 int ack)
212 {
213 unsigned long flags;
214 int timeout, ok;
215
216 spin_lock_irqsave(&mpu->input_lock, flags);
217 if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
218 mpu->write(mpu, 0x00, MPU401D(mpu));
219 /*snd_mpu401_uart_clear_rx(mpu);*/
220 }
221 /* ok. standard MPU-401 initialization */
222 if (mpu->hardware != MPU401_HW_SB) {
223 for (timeout = 1000; timeout > 0 &&
224 !snd_mpu401_output_ready(mpu); timeout--)
225 udelay(10);
226 #ifdef CONFIG_SND_DEBUG
227 if (!timeout)
228 dev_err(mpu->rmidi->dev,
229 "cmd: tx timeout (status = 0x%x)\n",
230 mpu->read(mpu, MPU401C(mpu)));
231 #endif
232 }
233 mpu->write(mpu, cmd, MPU401C(mpu));
234 if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
235 ok = 0;
236 timeout = 10000;
237 while (!ok && timeout-- > 0) {
238 if (snd_mpu401_input_avail(mpu)) {
239 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
240 ok = 1;
241 }
242 }
243 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
244 ok = 1;
245 } else
246 ok = 1;
247 spin_unlock_irqrestore(&mpu->input_lock, flags);
248 if (!ok) {
249 dev_err(mpu->rmidi->dev,
250 "cmd: 0x%x failed at 0x%lx (status = 0x%x, data = 0x%x)\n",
251 cmd, mpu->port,
252 mpu->read(mpu, MPU401C(mpu)),
253 mpu->read(mpu, MPU401D(mpu)));
254 return 1;
255 }
256 return 0;
257 }
258
snd_mpu401_do_reset(struct snd_mpu401 * mpu)259 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
260 {
261 if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
262 return -EIO;
263 if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
264 return -EIO;
265 return 0;
266 }
267
268 /*
269 * input/output open/close - protected by open_mutex in rawmidi.c
270 */
snd_mpu401_uart_input_open(struct snd_rawmidi_substream * substream)271 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
272 {
273 struct snd_mpu401 *mpu;
274 int err;
275
276 mpu = substream->rmidi->private_data;
277 if (mpu->open_input) {
278 err = mpu->open_input(mpu);
279 if (err < 0)
280 return err;
281 }
282 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
283 if (snd_mpu401_do_reset(mpu) < 0)
284 goto error_out;
285 }
286 mpu->substream_input = substream;
287 set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
288 return 0;
289
290 error_out:
291 if (mpu->open_input && mpu->close_input)
292 mpu->close_input(mpu);
293 return -EIO;
294 }
295
snd_mpu401_uart_output_open(struct snd_rawmidi_substream * substream)296 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
297 {
298 struct snd_mpu401 *mpu;
299 int err;
300
301 mpu = substream->rmidi->private_data;
302 if (mpu->open_output) {
303 err = mpu->open_output(mpu);
304 if (err < 0)
305 return err;
306 }
307 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
308 if (snd_mpu401_do_reset(mpu) < 0)
309 goto error_out;
310 }
311 mpu->substream_output = substream;
312 set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
313 return 0;
314
315 error_out:
316 if (mpu->open_output && mpu->close_output)
317 mpu->close_output(mpu);
318 return -EIO;
319 }
320
snd_mpu401_uart_input_close(struct snd_rawmidi_substream * substream)321 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
322 {
323 struct snd_mpu401 *mpu;
324 int err = 0;
325
326 mpu = substream->rmidi->private_data;
327 clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
328 mpu->substream_input = NULL;
329 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
330 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
331 if (mpu->close_input)
332 mpu->close_input(mpu);
333 if (err)
334 return -EIO;
335 return 0;
336 }
337
snd_mpu401_uart_output_close(struct snd_rawmidi_substream * substream)338 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
339 {
340 struct snd_mpu401 *mpu;
341 int err = 0;
342
343 mpu = substream->rmidi->private_data;
344 clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
345 mpu->substream_output = NULL;
346 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
347 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
348 if (mpu->close_output)
349 mpu->close_output(mpu);
350 if (err)
351 return -EIO;
352 return 0;
353 }
354
355 /*
356 * trigger input callback
357 */
358 static void
snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream * substream,int up)359 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
360 {
361 unsigned long flags;
362 struct snd_mpu401 *mpu;
363 int max = 64;
364
365 mpu = substream->rmidi->private_data;
366 if (up) {
367 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
368 &mpu->mode)) {
369 /* first time - flush FIFO */
370 while (max-- > 0)
371 mpu->read(mpu, MPU401D(mpu));
372 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
373 snd_mpu401_uart_add_timer(mpu, 1);
374 }
375
376 /* read data in advance */
377 spin_lock_irqsave(&mpu->input_lock, flags);
378 snd_mpu401_uart_input_read(mpu);
379 spin_unlock_irqrestore(&mpu->input_lock, flags);
380 } else {
381 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
382 snd_mpu401_uart_remove_timer(mpu, 1);
383 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
384 }
385
386 }
387
388 /*
389 * transfer input pending data
390 * call with input_lock spinlock held
391 */
snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)392 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
393 {
394 int max = 128;
395 unsigned char byte;
396
397 while (max-- > 0) {
398 if (! snd_mpu401_input_avail(mpu))
399 break; /* input not available */
400 byte = mpu->read(mpu, MPU401D(mpu));
401 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
402 snd_rawmidi_receive(mpu->substream_input, &byte, 1);
403 }
404 }
405
406 /*
407 * Tx FIFO sizes:
408 * CS4237B - 16 bytes
409 * AudioDrive ES1688 - 12 bytes
410 * S3 SonicVibes - 8 bytes
411 * SoundBlaster AWE 64 - 2 bytes (ugly hardware)
412 */
413
414 /*
415 * write output pending bytes
416 * call with output_lock spinlock held
417 */
snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)418 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
419 {
420 unsigned char byte;
421 int max = 256;
422
423 do {
424 if (snd_rawmidi_transmit_peek(mpu->substream_output,
425 &byte, 1) == 1) {
426 /*
427 * Try twice because there is hardware that insists on
428 * setting the output busy bit after each write.
429 */
430 if (!snd_mpu401_output_ready(mpu) &&
431 !snd_mpu401_output_ready(mpu))
432 break; /* Tx FIFO full - try again later */
433 mpu->write(mpu, byte, MPU401D(mpu));
434 snd_rawmidi_transmit_ack(mpu->substream_output, 1);
435 } else {
436 snd_mpu401_uart_remove_timer (mpu, 0);
437 break; /* no other data - leave the tx loop */
438 }
439 } while (--max > 0);
440 }
441
442 /*
443 * output trigger callback
444 */
445 static void
snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream * substream,int up)446 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
447 {
448 unsigned long flags;
449 struct snd_mpu401 *mpu;
450
451 mpu = substream->rmidi->private_data;
452 if (up) {
453 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
454
455 /* try to add the timer at each output trigger,
456 * since the output timer might have been removed in
457 * snd_mpu401_uart_output_write().
458 */
459 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
460 snd_mpu401_uart_add_timer(mpu, 0);
461
462 /* output pending data */
463 spin_lock_irqsave(&mpu->output_lock, flags);
464 snd_mpu401_uart_output_write(mpu);
465 spin_unlock_irqrestore(&mpu->output_lock, flags);
466 } else {
467 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
468 snd_mpu401_uart_remove_timer(mpu, 0);
469 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
470 }
471 }
472
473 /*
474
475 */
476
477 static const struct snd_rawmidi_ops snd_mpu401_uart_output =
478 {
479 .open = snd_mpu401_uart_output_open,
480 .close = snd_mpu401_uart_output_close,
481 .trigger = snd_mpu401_uart_output_trigger,
482 };
483
484 static const struct snd_rawmidi_ops snd_mpu401_uart_input =
485 {
486 .open = snd_mpu401_uart_input_open,
487 .close = snd_mpu401_uart_input_close,
488 .trigger = snd_mpu401_uart_input_trigger,
489 };
490
snd_mpu401_uart_free(struct snd_rawmidi * rmidi)491 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
492 {
493 struct snd_mpu401 *mpu = rmidi->private_data;
494 if (mpu->irq >= 0)
495 free_irq(mpu->irq, (void *) mpu);
496 release_and_free_resource(mpu->res);
497 kfree(mpu);
498 }
499
500 /**
501 * snd_mpu401_uart_new - create an MPU401-UART instance
502 * @card: the card instance
503 * @device: the device index, zero-based
504 * @hardware: the hardware type, MPU401_HW_XXXX
505 * @port: the base address of MPU401 port
506 * @info_flags: bitflags MPU401_INFO_XXX
507 * @irq: the ISA irq number, -1 if not to be allocated
508 * @rrawmidi: the pointer to store the new rawmidi instance
509 *
510 * Creates a new MPU-401 instance.
511 *
512 * Note that the rawmidi instance is returned on the rrawmidi argument,
513 * not the mpu401 instance itself. To access to the mpu401 instance,
514 * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
515 *
516 * Return: Zero if successful, or a negative error code.
517 */
snd_mpu401_uart_new(struct snd_card * card,int device,unsigned short hardware,unsigned long port,unsigned int info_flags,int irq,struct snd_rawmidi ** rrawmidi)518 int snd_mpu401_uart_new(struct snd_card *card, int device,
519 unsigned short hardware,
520 unsigned long port,
521 unsigned int info_flags,
522 int irq,
523 struct snd_rawmidi ** rrawmidi)
524 {
525 struct snd_mpu401 *mpu;
526 struct snd_rawmidi *rmidi;
527 int in_enable, out_enable;
528 int err;
529
530 if (rrawmidi)
531 *rrawmidi = NULL;
532 if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
533 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
534 in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
535 out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
536 err = snd_rawmidi_new(card, "MPU-401U", device,
537 out_enable, in_enable, &rmidi);
538 if (err < 0)
539 return err;
540 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
541 if (!mpu) {
542 err = -ENOMEM;
543 goto free_device;
544 }
545 rmidi->private_data = mpu;
546 rmidi->private_free = snd_mpu401_uart_free;
547 spin_lock_init(&mpu->input_lock);
548 spin_lock_init(&mpu->output_lock);
549 spin_lock_init(&mpu->timer_lock);
550 mpu->hardware = hardware;
551 mpu->irq = -1;
552 mpu->rmidi = rmidi;
553 if (! (info_flags & MPU401_INFO_INTEGRATED)) {
554 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
555 mpu->res = request_region(port, res_size, "MPU401 UART");
556 if (!mpu->res) {
557 dev_err(rmidi->dev,
558 "mpu401_uart: unable to grab port 0x%lx size %d\n",
559 port, res_size);
560 err = -EBUSY;
561 goto free_device;
562 }
563 }
564 if (info_flags & MPU401_INFO_MMIO) {
565 mpu->write = mpu401_write_mmio;
566 mpu->read = mpu401_read_mmio;
567 } else {
568 mpu->write = mpu401_write_port;
569 mpu->read = mpu401_read_port;
570 }
571 mpu->port = port;
572 if (hardware == MPU401_HW_PC98II)
573 mpu->cport = port + 2;
574 else
575 mpu->cport = port + 1;
576 if (irq >= 0) {
577 if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
578 "MPU401 UART", (void *) mpu)) {
579 dev_err(rmidi->dev,
580 "mpu401_uart: unable to grab IRQ %d\n", irq);
581 err = -EBUSY;
582 goto free_device;
583 }
584 }
585 if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
586 info_flags |= MPU401_INFO_USE_TIMER;
587 mpu->info_flags = info_flags;
588 mpu->irq = irq;
589 if (card->shortname[0])
590 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
591 card->shortname);
592 else
593 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
594 if (out_enable) {
595 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
596 &snd_mpu401_uart_output);
597 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
598 }
599 if (in_enable) {
600 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
601 &snd_mpu401_uart_input);
602 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
603 if (out_enable)
604 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
605 }
606 if (rrawmidi)
607 *rrawmidi = rmidi;
608 return 0;
609 free_device:
610 snd_device_free(card, rmidi);
611 return err;
612 }
613
614 EXPORT_SYMBOL(snd_mpu401_uart_new);
615