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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 <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 */
 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  * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
134  */
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  */
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  */
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  */
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  */
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 
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 
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  */
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 
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 
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 
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
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  */
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  */
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
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 
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  */
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 
624 static int __init alsa_mpu401_uart_init(void)
625 {
626         return 0;
627 }
628 
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 

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