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TOMOYO Linux Cross Reference
Linux/sound/drivers/mpu401/mpu401_uart.c

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  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 <asm/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 */
 59 static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
 60                               unsigned long addr)
 61 {
 62         outb(data, addr);
 63 }
 64 
 65 static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
 66                                       unsigned long addr)
 67 {
 68         return inb(addr);
 69 }
 70 
 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 
 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 
 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 
 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 
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 irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
134 {
135         struct snd_mpu401 *mpu = dev_id;
136         
137         if (mpu == NULL)
138                 return IRQ_NONE;
139         _snd_mpu401_uart_interrupt(mpu);
140         return IRQ_HANDLED;
141 }
142 
143 EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
144 
145 /**
146  * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
147  * @irq: the irq number
148  * @dev_id: mpu401 instance
149  *
150  * Processes the interrupt for MPU401-UART output.
151  */
152 irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
153 {
154         struct snd_mpu401 *mpu = dev_id;
155         
156         if (mpu == NULL)
157                 return IRQ_NONE;
158         uart_interrupt_tx(mpu);
159         return IRQ_HANDLED;
160 }
161 
162 EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
163 
164 /*
165  * timer callback
166  * reprogram the timer and call the interrupt job
167  */
168 static void snd_mpu401_uart_timer(unsigned long data)
169 {
170         struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
171         unsigned long flags;
172 
173         spin_lock_irqsave(&mpu->timer_lock, flags);
174         /*mpu->mode |= MPU401_MODE_TIMER;*/
175         mpu->timer.expires = 1 + jiffies;
176         add_timer(&mpu->timer);
177         spin_unlock_irqrestore(&mpu->timer_lock, flags);
178         if (mpu->rmidi)
179                 _snd_mpu401_uart_interrupt(mpu);
180 }
181 
182 /*
183  * initialize the timer callback if not programmed yet
184  */
185 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
186 {
187         unsigned long flags;
188 
189         spin_lock_irqsave (&mpu->timer_lock, flags);
190         if (mpu->timer_invoked == 0) {
191                 init_timer(&mpu->timer);
192                 mpu->timer.data = (unsigned long)mpu;
193                 mpu->timer.function = snd_mpu401_uart_timer;
194                 mpu->timer.expires = 1 + jiffies;
195                 add_timer(&mpu->timer);
196         } 
197         mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
198                 MPU401_MODE_OUTPUT_TIMER;
199         spin_unlock_irqrestore (&mpu->timer_lock, flags);
200 }
201 
202 /*
203  * remove the timer callback if still active
204  */
205 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
206 {
207         unsigned long flags;
208 
209         spin_lock_irqsave (&mpu->timer_lock, flags);
210         if (mpu->timer_invoked) {
211                 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
212                         ~MPU401_MODE_OUTPUT_TIMER;
213                 if (! mpu->timer_invoked)
214                         del_timer(&mpu->timer);
215         }
216         spin_unlock_irqrestore (&mpu->timer_lock, flags);
217 }
218 
219 /*
220  * send a UART command
221  * return zero if successful, non-zero for some errors
222  */
223 
224 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
225                                int ack)
226 {
227         unsigned long flags;
228         int timeout, ok;
229 
230         spin_lock_irqsave(&mpu->input_lock, flags);
231         if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
232                 mpu->write(mpu, 0x00, MPU401D(mpu));
233                 /*snd_mpu401_uart_clear_rx(mpu);*/
234         }
235         /* ok. standard MPU-401 initialization */
236         if (mpu->hardware != MPU401_HW_SB) {
237                 for (timeout = 1000; timeout > 0 &&
238                              !snd_mpu401_output_ready(mpu); timeout--)
239                         udelay(10);
240 #ifdef CONFIG_SND_DEBUG
241                 if (!timeout)
242                         snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
243                                    mpu->read(mpu, MPU401C(mpu)));
244 #endif
245         }
246         mpu->write(mpu, cmd, MPU401C(mpu));
247         if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
248                 ok = 0;
249                 timeout = 10000;
250                 while (!ok && timeout-- > 0) {
251                         if (snd_mpu401_input_avail(mpu)) {
252                                 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
253                                         ok = 1;
254                         }
255                 }
256                 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
257                         ok = 1;
258         } else
259                 ok = 1;
260         spin_unlock_irqrestore(&mpu->input_lock, flags);
261         if (!ok) {
262                 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
263                            "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
264                            mpu->read(mpu, MPU401C(mpu)),
265                            mpu->read(mpu, MPU401D(mpu)));
266                 return 1;
267         }
268         return 0;
269 }
270 
271 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
272 {
273         if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
274                 return -EIO;
275         if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
276                 return -EIO;
277         return 0;
278 }
279 
280 /*
281  * input/output open/close - protected by open_mutex in rawmidi.c
282  */
283 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
284 {
285         struct snd_mpu401 *mpu;
286         int err;
287 
288         mpu = substream->rmidi->private_data;
289         if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
290                 return err;
291         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
292                 if (snd_mpu401_do_reset(mpu) < 0)
293                         goto error_out;
294         }
295         mpu->substream_input = substream;
296         set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
297         return 0;
298 
299 error_out:
300         if (mpu->open_input && mpu->close_input)
301                 mpu->close_input(mpu);
302         return -EIO;
303 }
304 
305 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
306 {
307         struct snd_mpu401 *mpu;
308         int err;
309 
310         mpu = substream->rmidi->private_data;
311         if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
312                 return err;
313         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
314                 if (snd_mpu401_do_reset(mpu) < 0)
315                         goto error_out;
316         }
317         mpu->substream_output = substream;
318         set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
319         return 0;
320 
321 error_out:
322         if (mpu->open_output && mpu->close_output)
323                 mpu->close_output(mpu);
324         return -EIO;
325 }
326 
327 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
328 {
329         struct snd_mpu401 *mpu;
330         int err = 0;
331 
332         mpu = substream->rmidi->private_data;
333         clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
334         mpu->substream_input = NULL;
335         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
336                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
337         if (mpu->close_input)
338                 mpu->close_input(mpu);
339         if (err)
340                 return -EIO;
341         return 0;
342 }
343 
344 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
345 {
346         struct snd_mpu401 *mpu;
347         int err = 0;
348 
349         mpu = substream->rmidi->private_data;
350         clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
351         mpu->substream_output = NULL;
352         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
353                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
354         if (mpu->close_output)
355                 mpu->close_output(mpu);
356         if (err)
357                 return -EIO;
358         return 0;
359 }
360 
361 /*
362  * trigger input callback
363  */
364 static void
365 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
366 {
367         unsigned long flags;
368         struct snd_mpu401 *mpu;
369         int max = 64;
370 
371         mpu = substream->rmidi->private_data;
372         if (up) {
373                 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
374                                        &mpu->mode)) {
375                         /* first time - flush FIFO */
376                         while (max-- > 0)
377                                 mpu->read(mpu, MPU401D(mpu));
378                         if (mpu->info_flags & MPU401_INFO_USE_TIMER)
379                                 snd_mpu401_uart_add_timer(mpu, 1);
380                 }
381                 
382                 /* read data in advance */
383                 spin_lock_irqsave(&mpu->input_lock, flags);
384                 snd_mpu401_uart_input_read(mpu);
385                 spin_unlock_irqrestore(&mpu->input_lock, flags);
386         } else {
387                 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
388                         snd_mpu401_uart_remove_timer(mpu, 1);
389                 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
390         }
391 
392 }
393 
394 /*
395  * transfer input pending data
396  * call with input_lock spinlock held
397  */
398 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
399 {
400         int max = 128;
401         unsigned char byte;
402 
403         while (max-- > 0) {
404                 if (! snd_mpu401_input_avail(mpu))
405                         break; /* input not available */
406                 byte = mpu->read(mpu, MPU401D(mpu));
407                 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
408                         snd_rawmidi_receive(mpu->substream_input, &byte, 1);
409         }
410 }
411 
412 /*
413  *  Tx FIFO sizes:
414  *    CS4237B                   - 16 bytes
415  *    AudioDrive ES1688         - 12 bytes
416  *    S3 SonicVibes             -  8 bytes
417  *    SoundBlaster AWE 64       -  2 bytes (ugly hardware)
418  */
419 
420 /*
421  * write output pending bytes
422  * call with output_lock spinlock held
423  */
424 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
425 {
426         unsigned char byte;
427         int max = 256;
428 
429         do {
430                 if (snd_rawmidi_transmit_peek(mpu->substream_output,
431                                               &byte, 1) == 1) {
432                         /*
433                          * Try twice because there is hardware that insists on
434                          * setting the output busy bit after each write.
435                          */
436                         if (!snd_mpu401_output_ready(mpu) &&
437                             !snd_mpu401_output_ready(mpu))
438                                 break;  /* Tx FIFO full - try again later */
439                         mpu->write(mpu, byte, MPU401D(mpu));
440                         snd_rawmidi_transmit_ack(mpu->substream_output, 1);
441                 } else {
442                         snd_mpu401_uart_remove_timer (mpu, 0);
443                         break;  /* no other data - leave the tx loop */
444                 }
445         } while (--max > 0);
446 }
447 
448 /*
449  * output trigger callback
450  */
451 static void
452 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
453 {
454         unsigned long flags;
455         struct snd_mpu401 *mpu;
456 
457         mpu = substream->rmidi->private_data;
458         if (up) {
459                 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
460 
461                 /* try to add the timer at each output trigger,
462                  * since the output timer might have been removed in
463                  * snd_mpu401_uart_output_write().
464                  */
465                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
466                         snd_mpu401_uart_add_timer(mpu, 0);
467 
468                 /* output pending data */
469                 spin_lock_irqsave(&mpu->output_lock, flags);
470                 snd_mpu401_uart_output_write(mpu);
471                 spin_unlock_irqrestore(&mpu->output_lock, flags);
472         } else {
473                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
474                         snd_mpu401_uart_remove_timer(mpu, 0);
475                 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
476         }
477 }
478 
479 /*
480 
481  */
482 
483 static struct snd_rawmidi_ops snd_mpu401_uart_output =
484 {
485         .open =         snd_mpu401_uart_output_open,
486         .close =        snd_mpu401_uart_output_close,
487         .trigger =      snd_mpu401_uart_output_trigger,
488 };
489 
490 static struct snd_rawmidi_ops snd_mpu401_uart_input =
491 {
492         .open =         snd_mpu401_uart_input_open,
493         .close =        snd_mpu401_uart_input_close,
494         .trigger =      snd_mpu401_uart_input_trigger,
495 };
496 
497 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
498 {
499         struct snd_mpu401 *mpu = rmidi->private_data;
500         if (mpu->irq >= 0)
501                 free_irq(mpu->irq, (void *) mpu);
502         release_and_free_resource(mpu->res);
503         kfree(mpu);
504 }
505 
506 /**
507  * snd_mpu401_uart_new - create an MPU401-UART instance
508  * @card: the card instance
509  * @device: the device index, zero-based
510  * @hardware: the hardware type, MPU401_HW_XXXX
511  * @port: the base address of MPU401 port
512  * @info_flags: bitflags MPU401_INFO_XXX
513  * @irq: the ISA irq number, -1 if not to be allocated
514  * @rrawmidi: the pointer to store the new rawmidi instance
515  *
516  * Creates a new MPU-401 instance.
517  *
518  * Note that the rawmidi instance is returned on the rrawmidi argument,
519  * not the mpu401 instance itself.  To access to the mpu401 instance,
520  * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
521  *
522  * Returns zero if successful, or a negative error code.
523  */
524 int snd_mpu401_uart_new(struct snd_card *card, int device,
525                         unsigned short hardware,
526                         unsigned long port,
527                         unsigned int info_flags,
528                         int irq,
529                         struct snd_rawmidi ** rrawmidi)
530 {
531         struct snd_mpu401 *mpu;
532         struct snd_rawmidi *rmidi;
533         int in_enable, out_enable;
534         int err;
535 
536         if (rrawmidi)
537                 *rrawmidi = NULL;
538         if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
539                 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
540         in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
541         out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
542         if ((err = snd_rawmidi_new(card, "MPU-401U", device,
543                                    out_enable, in_enable, &rmidi)) < 0)
544                 return err;
545         mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
546         if (mpu == NULL) {
547                 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
548                 snd_device_free(card, rmidi);
549                 return -ENOMEM;
550         }
551         rmidi->private_data = mpu;
552         rmidi->private_free = snd_mpu401_uart_free;
553         spin_lock_init(&mpu->input_lock);
554         spin_lock_init(&mpu->output_lock);
555         spin_lock_init(&mpu->timer_lock);
556         mpu->hardware = hardware;
557         mpu->irq = -1;
558         if (! (info_flags & MPU401_INFO_INTEGRATED)) {
559                 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
560                 mpu->res = request_region(port, res_size, "MPU401 UART");
561                 if (mpu->res == NULL) {
562                         snd_printk(KERN_ERR "mpu401_uart: "
563                                    "unable to grab port 0x%lx size %d\n",
564                                    port, res_size);
565                         snd_device_free(card, rmidi);
566                         return -EBUSY;
567                 }
568         }
569         if (info_flags & MPU401_INFO_MMIO) {
570                 mpu->write = mpu401_write_mmio;
571                 mpu->read = mpu401_read_mmio;
572         } else {
573                 mpu->write = mpu401_write_port;
574                 mpu->read = mpu401_read_port;
575         }
576         mpu->port = port;
577         if (hardware == MPU401_HW_PC98II)
578                 mpu->cport = port + 2;
579         else
580                 mpu->cport = port + 1;
581         if (irq >= 0) {
582                 if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
583                                 "MPU401 UART", (void *) mpu)) {
584                         snd_printk(KERN_ERR "mpu401_uart: "
585                                    "unable to grab IRQ %d\n", irq);
586                         snd_device_free(card, rmidi);
587                         return -EBUSY;
588                 }
589         }
590         if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
591                 info_flags |= MPU401_INFO_USE_TIMER;
592         mpu->info_flags = info_flags;
593         mpu->irq = irq;
594         if (card->shortname[0])
595                 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
596                          card->shortname);
597         else
598                 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
599         if (out_enable) {
600                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
601                                     &snd_mpu401_uart_output);
602                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
603         }
604         if (in_enable) {
605                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
606                                     &snd_mpu401_uart_input);
607                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
608                 if (out_enable)
609                         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
610         }
611         mpu->rmidi = rmidi;
612         if (rrawmidi)
613                 *rrawmidi = rmidi;
614         return 0;
615 }
616 
617 EXPORT_SYMBOL(snd_mpu401_uart_new);
618 
619 /*
620  *  INIT part
621  */
622 
623 static int __init alsa_mpu401_uart_init(void)
624 {
625         return 0;
626 }
627 
628 static void __exit alsa_mpu401_uart_exit(void)
629 {
630 }
631 
632 module_init(alsa_mpu401_uart_init)
633 module_exit(alsa_mpu401_uart_exit)
634 

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