1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Routines for control of MPU-401 in UART mode
4 *
5 * MPU-401 supports UART mode which is not capable generate transmit
6 * interrupts thus output is done via polling. Without interrupt,
7 * input is done also via polling. Do not expect good performance.
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 * 13-03-2003:
25 * Added support for different kind of hardware I/O. Build in choices
26 * are port and mmio. For other kind of I/O, set mpu->read and
27 * mpu->write to your own I/O functions.
28 *
29 */
30
31 #include <linux/io.h>
32 #include <linux/delay.h>
33 #include <linux/init.h>
34 #include <linux/slab.h>
35 #include <linux/ioport.h>
36 #include <linux/module.h>
37 #include <linux/interrupt.h>
38 #include <linux/errno.h>
39 #include <sound/core.h>
40 #include <sound/mpu401.h>
41
42 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
43 MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
44 MODULE_LICENSE("GPL");
45
46 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
47 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
48
49 /*
50
51 */
52
53 #define snd_mpu401_input_avail(mpu) \
54 (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
55 #define snd_mpu401_output_ready(mpu) \
56 (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
57
58 /* Build in lowlevel io */
mpu401_write_port(struct snd_mpu401 * mpu,unsigned char data,unsigned long addr)59 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
60 unsigned long addr)
61 {
62 outb(data, addr);
63 }
64
mpu401_read_port(struct snd_mpu401 * mpu,unsigned long addr)65 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
66 unsigned long addr)
67 {
68 return inb(addr);
69 }
70
mpu401_write_mmio(struct snd_mpu401 * mpu,unsigned char data,unsigned long addr)71 static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
72 unsigned long addr)
73 {
74 writeb(data, (void __iomem *)addr);
75 }
76
mpu401_read_mmio(struct snd_mpu401 * mpu,unsigned long addr)77 static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
78 unsigned long addr)
79 {
80 return readb((void __iomem *)addr);
81 }
82 /* */
83
snd_mpu401_uart_clear_rx(struct snd_mpu401 * mpu)84 static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
85 {
86 int timeout = 100000;
87 for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
88 mpu->read(mpu, MPU401D(mpu));
89 #ifdef CONFIG_SND_DEBUG
90 if (timeout <= 0)
91 snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
92 mpu->read(mpu, MPU401C(mpu)));
93 #endif
94 }
95
uart_interrupt_tx(struct snd_mpu401 * mpu)96 static void uart_interrupt_tx(struct snd_mpu401 *mpu)
97 {
98 unsigned long flags;
99
100 if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
101 test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
102 spin_lock_irqsave(&mpu->output_lock, flags);
103 snd_mpu401_uart_output_write(mpu);
104 spin_unlock_irqrestore(&mpu->output_lock, flags);
105 }
106 }
107
_snd_mpu401_uart_interrupt(struct snd_mpu401 * mpu)108 static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
109 {
110 unsigned long flags;
111
112 if (mpu->info_flags & MPU401_INFO_INPUT) {
113 spin_lock_irqsave(&mpu->input_lock, flags);
114 if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
115 snd_mpu401_uart_input_read(mpu);
116 else
117 snd_mpu401_uart_clear_rx(mpu);
118 spin_unlock_irqrestore(&mpu->input_lock, flags);
119 }
120 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
121 /* ok. for better Tx performance try do some output
122 when input is done */
123 uart_interrupt_tx(mpu);
124 }
125
126 /**
127 * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
128 * @irq: the irq number
129 * @dev_id: mpu401 instance
130 *
131 * Processes the interrupt for MPU401-UART i/o.
132 *
133 * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
134 */
snd_mpu401_uart_interrupt(int irq,void * dev_id)135 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
136 {
137 struct snd_mpu401 *mpu = dev_id;
138
139 if (mpu == NULL)
140 return IRQ_NONE;
141 _snd_mpu401_uart_interrupt(mpu);
142 return IRQ_HANDLED;
143 }
144
145 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
146
147 /**
148 * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
149 * @irq: the irq number
150 * @dev_id: mpu401 instance
151 *
152 * Processes the interrupt for MPU401-UART output.
153 *
154 * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
155 */
snd_mpu401_uart_interrupt_tx(int irq,void * dev_id)156 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
157 {
158 struct snd_mpu401 *mpu = dev_id;
159
160 if (mpu == NULL)
161 return IRQ_NONE;
162 uart_interrupt_tx(mpu);
163 return IRQ_HANDLED;
164 }
165
166 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
167
168 /*
169 * timer callback
170 * reprogram the timer and call the interrupt job
171 */
snd_mpu401_uart_timer(unsigned long data)172 static void snd_mpu401_uart_timer(unsigned long data)
173 {
174 struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
175 unsigned long flags;
176
177 spin_lock_irqsave(&mpu->timer_lock, flags);
178 /*mpu->mode |= MPU401_MODE_TIMER;*/
179 mod_timer(&mpu->timer, 1 + jiffies);
180 spin_unlock_irqrestore(&mpu->timer_lock, flags);
181 if (mpu->rmidi)
182 _snd_mpu401_uart_interrupt(mpu);
183 }
184
185 /*
186 * initialize the timer callback if not programmed yet
187 */
snd_mpu401_uart_add_timer(struct snd_mpu401 * mpu,int input)188 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
189 {
190 unsigned long flags;
191
192 spin_lock_irqsave (&mpu->timer_lock, flags);
193 if (mpu->timer_invoked == 0) {
194 setup_timer(&mpu->timer, snd_mpu401_uart_timer,
195 (unsigned long)mpu);
196 mod_timer(&mpu->timer, 1 + jiffies);
197 }
198 mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
199 MPU401_MODE_OUTPUT_TIMER;
200 spin_unlock_irqrestore (&mpu->timer_lock, flags);
201 }
202
203 /*
204 * remove the timer callback if still active
205 */
snd_mpu401_uart_remove_timer(struct snd_mpu401 * mpu,int input)206 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
207 {
208 unsigned long flags;
209
210 spin_lock_irqsave (&mpu->timer_lock, flags);
211 if (mpu->timer_invoked) {
212 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
213 ~MPU401_MODE_OUTPUT_TIMER;
214 if (! mpu->timer_invoked)
215 del_timer(&mpu->timer);
216 }
217 spin_unlock_irqrestore (&mpu->timer_lock, flags);
218 }
219
220 /*
221 * send a UART command
222 * return zero if successful, non-zero for some errors
223 */
224
snd_mpu401_uart_cmd(struct snd_mpu401 * mpu,unsigned char cmd,int ack)225 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
226 int ack)
227 {
228 unsigned long flags;
229 int timeout, ok;
230
231 spin_lock_irqsave(&mpu->input_lock, flags);
232 if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
233 mpu->write(mpu, 0x00, MPU401D(mpu));
234 /*snd_mpu401_uart_clear_rx(mpu);*/
235 }
236 /* ok. standard MPU-401 initialization */
237 if (mpu->hardware != MPU401_HW_SB) {
238 for (timeout = 1000; timeout > 0 &&
239 !snd_mpu401_output_ready(mpu); timeout--)
240 udelay(10);
241 #ifdef CONFIG_SND_DEBUG
242 if (!timeout)
243 snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
244 mpu->read(mpu, MPU401C(mpu)));
245 #endif
246 }
247 mpu->write(mpu, cmd, MPU401C(mpu));
248 if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
249 ok = 0;
250 timeout = 10000;
251 while (!ok && timeout-- > 0) {
252 if (snd_mpu401_input_avail(mpu)) {
253 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
254 ok = 1;
255 }
256 }
257 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
258 ok = 1;
259 } else
260 ok = 1;
261 spin_unlock_irqrestore(&mpu->input_lock, flags);
262 if (!ok) {
263 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
264 "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
265 mpu->read(mpu, MPU401C(mpu)),
266 mpu->read(mpu, MPU401D(mpu)));
267 return 1;
268 }
269 return 0;
270 }
271
snd_mpu401_do_reset(struct snd_mpu401 * mpu)272 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
273 {
274 if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
275 return -EIO;
276 if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
277 return -EIO;
278 return 0;
279 }
280
281 /*
282 * input/output open/close - protected by open_mutex in rawmidi.c
283 */
snd_mpu401_uart_input_open(struct snd_rawmidi_substream * substream)284 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
285 {
286 struct snd_mpu401 *mpu;
287 int err;
288
289 mpu = substream->rmidi->private_data;
290 if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
291 return err;
292 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
293 if (snd_mpu401_do_reset(mpu) < 0)
294 goto error_out;
295 }
296 mpu->substream_input = substream;
297 set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
298 return 0;
299
300 error_out:
301 if (mpu->open_input && mpu->close_input)
302 mpu->close_input(mpu);
303 return -EIO;
304 }
305
snd_mpu401_uart_output_open(struct snd_rawmidi_substream * substream)306 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
307 {
308 struct snd_mpu401 *mpu;
309 int err;
310
311 mpu = substream->rmidi->private_data;
312 if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
313 return err;
314 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
315 if (snd_mpu401_do_reset(mpu) < 0)
316 goto error_out;
317 }
318 mpu->substream_output = substream;
319 set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
320 return 0;
321
322 error_out:
323 if (mpu->open_output && mpu->close_output)
324 mpu->close_output(mpu);
325 return -EIO;
326 }
327
snd_mpu401_uart_input_close(struct snd_rawmidi_substream * substream)328 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
329 {
330 struct snd_mpu401 *mpu;
331 int err = 0;
332
333 mpu = substream->rmidi->private_data;
334 clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
335 mpu->substream_input = NULL;
336 if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
337 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
338 if (mpu->close_input)
339 mpu->close_input(mpu);
340 if (err)
341 return -EIO;
342 return 0;
343 }
344
snd_mpu401_uart_output_close(struct snd_rawmidi_substream * substream)345 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
346 {
347 struct snd_mpu401 *mpu;
348 int err = 0;
349
350 mpu = substream->rmidi->private_data;
351 clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
352 mpu->substream_output = NULL;
353 if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
354 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
355 if (mpu->close_output)
356 mpu->close_output(mpu);
357 if (err)
358 return -EIO;
359 return 0;
360 }
361
362 /*
363 * trigger input callback
364 */
365 static void
snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream * substream,int up)366 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
367 {
368 unsigned long flags;
369 struct snd_mpu401 *mpu;
370 int max = 64;
371
372 mpu = substream->rmidi->private_data;
373 if (up) {
374 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
375 &mpu->mode)) {
376 /* first time - flush FIFO */
377 while (max-- > 0)
378 mpu->read(mpu, MPU401D(mpu));
379 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
380 snd_mpu401_uart_add_timer(mpu, 1);
381 }
382
383 /* read data in advance */
384 spin_lock_irqsave(&mpu->input_lock, flags);
385 snd_mpu401_uart_input_read(mpu);
386 spin_unlock_irqrestore(&mpu->input_lock, flags);
387 } else {
388 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
389 snd_mpu401_uart_remove_timer(mpu, 1);
390 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
391 }
392
393 }
394
395 /*
396 * transfer input pending data
397 * call with input_lock spinlock held
398 */
snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)399 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
400 {
401 int max = 128;
402 unsigned char byte;
403
404 while (max-- > 0) {
405 if (! snd_mpu401_input_avail(mpu))
406 break; /* input not available */
407 byte = mpu->read(mpu, MPU401D(mpu));
408 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
409 snd_rawmidi_receive(mpu->substream_input, &byte, 1);
410 }
411 }
412
413 /*
414 * Tx FIFO sizes:
415 * CS4237B - 16 bytes
416 * AudioDrive ES1688 - 12 bytes
417 * S3 SonicVibes - 8 bytes
418 * SoundBlaster AWE 64 - 2 bytes (ugly hardware)
419 */
420
421 /*
422 * write output pending bytes
423 * call with output_lock spinlock held
424 */
snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)425 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
426 {
427 unsigned char byte;
428 int max = 256;
429
430 do {
431 if (snd_rawmidi_transmit_peek(mpu->substream_output,
432 &byte, 1) == 1) {
433 /*
434 * Try twice because there is hardware that insists on
435 * setting the output busy bit after each write.
436 */
437 if (!snd_mpu401_output_ready(mpu) &&
438 !snd_mpu401_output_ready(mpu))
439 break; /* Tx FIFO full - try again later */
440 mpu->write(mpu, byte, MPU401D(mpu));
441 snd_rawmidi_transmit_ack(mpu->substream_output, 1);
442 } else {
443 snd_mpu401_uart_remove_timer (mpu, 0);
444 break; /* no other data - leave the tx loop */
445 }
446 } while (--max > 0);
447 }
448
449 /*
450 * output trigger callback
451 */
452 static void
snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream * substream,int up)453 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
454 {
455 unsigned long flags;
456 struct snd_mpu401 *mpu;
457
458 mpu = substream->rmidi->private_data;
459 if (up) {
460 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
461
462 /* try to add the timer at each output trigger,
463 * since the output timer might have been removed in
464 * snd_mpu401_uart_output_write().
465 */
466 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
467 snd_mpu401_uart_add_timer(mpu, 0);
468
469 /* output pending data */
470 spin_lock_irqsave(&mpu->output_lock, flags);
471 snd_mpu401_uart_output_write(mpu);
472 spin_unlock_irqrestore(&mpu->output_lock, flags);
473 } else {
474 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
475 snd_mpu401_uart_remove_timer(mpu, 0);
476 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
477 }
478 }
479
480 /*
481
482 */
483
484 static struct snd_rawmidi_ops snd_mpu401_uart_output =
485 {
486 .open = snd_mpu401_uart_output_open,
487 .close = snd_mpu401_uart_output_close,
488 .trigger = snd_mpu401_uart_output_trigger,
489 };
490
491 static struct snd_rawmidi_ops snd_mpu401_uart_input =
492 {
493 .open = snd_mpu401_uart_input_open,
494 .close = snd_mpu401_uart_input_close,
495 .trigger = snd_mpu401_uart_input_trigger,
496 };
497
snd_mpu401_uart_free(struct snd_rawmidi * rmidi)498 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
499 {
500 struct snd_mpu401 *mpu = rmidi->private_data;
501 if (mpu->irq >= 0)
502 free_irq(mpu->irq, (void *) mpu);
503 release_and_free_resource(mpu->res);
504 kfree(mpu);
505 }
506
507 /**
508 * snd_mpu401_uart_new - create an MPU401-UART instance
509 * @card: the card instance
510 * @device: the device index, zero-based
511 * @hardware: the hardware type, MPU401_HW_XXXX
512 * @port: the base address of MPU401 port
513 * @info_flags: bitflags MPU401_INFO_XXX
514 * @irq: the ISA irq number, -1 if not to be allocated
515 * @rrawmidi: the pointer to store the new rawmidi instance
516 *
517 * Creates a new MPU-401 instance.
518 *
519 * Note that the rawmidi instance is returned on the rrawmidi argument,
520 * not the mpu401 instance itself. To access to the mpu401 instance,
521 * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
522 *
523 * Return: Zero if successful, or a negative error code.
524 */
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)525 int snd_mpu401_uart_new(struct snd_card *card, int device,
526 unsigned short hardware,
527 unsigned long port,
528 unsigned int info_flags,
529 int irq,
530 struct snd_rawmidi ** rrawmidi)
531 {
532 struct snd_mpu401 *mpu;
533 struct snd_rawmidi *rmidi;
534 int in_enable, out_enable;
535 int err;
536
537 if (rrawmidi)
538 *rrawmidi = NULL;
539 if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
540 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
541 in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
542 out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
543 if ((err = snd_rawmidi_new(card, "MPU-401U", device,
544 out_enable, in_enable, &rmidi)) < 0)
545 return err;
546 mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
547 if (mpu == NULL) {
548 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
549 snd_device_free(card, rmidi);
550 return -ENOMEM;
551 }
552 rmidi->private_data = mpu;
553 rmidi->private_free = snd_mpu401_uart_free;
554 spin_lock_init(&mpu->input_lock);
555 spin_lock_init(&mpu->output_lock);
556 spin_lock_init(&mpu->timer_lock);
557 mpu->hardware = hardware;
558 mpu->irq = -1;
559 if (! (info_flags & MPU401_INFO_INTEGRATED)) {
560 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
561 mpu->res = request_region(port, res_size, "MPU401 UART");
562 if (mpu->res == NULL) {
563 snd_printk(KERN_ERR "mpu401_uart: "
564 "unable to grab port 0x%lx size %d\n",
565 port, res_size);
566 snd_device_free(card, rmidi);
567 return -EBUSY;
568 }
569 }
570 if (info_flags & MPU401_INFO_MMIO) {
571 mpu->write = mpu401_write_mmio;
572 mpu->read = mpu401_read_mmio;
573 } else {
574 mpu->write = mpu401_write_port;
575 mpu->read = mpu401_read_port;
576 }
577 mpu->port = port;
578 if (hardware == MPU401_HW_PC98II)
579 mpu->cport = port + 2;
580 else
581 mpu->cport = port + 1;
582 if (irq >= 0) {
583 if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
584 "MPU401 UART", (void *) mpu)) {
585 snd_printk(KERN_ERR "mpu401_uart: "
586 "unable to grab IRQ %d\n", irq);
587 snd_device_free(card, rmidi);
588 return -EBUSY;
589 }
590 }
591 if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
592 info_flags |= MPU401_INFO_USE_TIMER;
593 mpu->info_flags = info_flags;
594 mpu->irq = irq;
595 if (card->shortname[0])
596 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
597 card->shortname);
598 else
599 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
600 if (out_enable) {
601 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
602 &snd_mpu401_uart_output);
603 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
604 }
605 if (in_enable) {
606 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
607 &snd_mpu401_uart_input);
608 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
609 if (out_enable)
610 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
611 }
612 mpu->rmidi = rmidi;
613 if (rrawmidi)
614 *rrawmidi = rmidi;
615 return 0;
616 }
617
618 EXPORT_SYMBOL(snd_mpu401_uart_new);
619
620 /*
621 * INIT part
622 */
623
alsa_mpu401_uart_init(void)624 static int __init alsa_mpu401_uart_init(void)
625 {
626 return 0;
627 }
628
alsa_mpu401_uart_exit(void)629 static void __exit alsa_mpu401_uart_exit(void)
630 {
631 }
632
633 module_init(alsa_mpu401_uart_init)
634 module_exit(alsa_mpu401_uart_exit)
635