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