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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  * 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         mpu->timer.expires = 1 + jiffies;
180         add_timer(&mpu->timer);
181         spin_unlock_irqrestore(&mpu->timer_lock, flags);
182         if (mpu->rmidi)
183                 _snd_mpu401_uart_interrupt(mpu);
184 }
185 
186 /*
187  * initialize the timer callback if not programmed yet
188  */
189 static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
190 {
191         unsigned long flags;
192 
193         spin_lock_irqsave (&mpu->timer_lock, flags);
194         if (mpu->timer_invoked == 0) {
195                 init_timer(&mpu->timer);
196                 mpu->timer.data = (unsigned long)mpu;
197                 mpu->timer.function = snd_mpu401_uart_timer;
198                 mpu->timer.expires = 1 + jiffies;
199                 add_timer(&mpu->timer);
200         } 
201         mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
202                 MPU401_MODE_OUTPUT_TIMER;
203         spin_unlock_irqrestore (&mpu->timer_lock, flags);
204 }
205 
206 /*
207  * remove the timer callback if still active
208  */
209 static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
210 {
211         unsigned long flags;
212 
213         spin_lock_irqsave (&mpu->timer_lock, flags);
214         if (mpu->timer_invoked) {
215                 mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
216                         ~MPU401_MODE_OUTPUT_TIMER;
217                 if (! mpu->timer_invoked)
218                         del_timer(&mpu->timer);
219         }
220         spin_unlock_irqrestore (&mpu->timer_lock, flags);
221 }
222 
223 /*
224  * send a UART command
225  * return zero if successful, non-zero for some errors
226  */
227 
228 static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
229                                int ack)
230 {
231         unsigned long flags;
232         int timeout, ok;
233 
234         spin_lock_irqsave(&mpu->input_lock, flags);
235         if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
236                 mpu->write(mpu, 0x00, MPU401D(mpu));
237                 /*snd_mpu401_uart_clear_rx(mpu);*/
238         }
239         /* ok. standard MPU-401 initialization */
240         if (mpu->hardware != MPU401_HW_SB) {
241                 for (timeout = 1000; timeout > 0 &&
242                              !snd_mpu401_output_ready(mpu); timeout--)
243                         udelay(10);
244 #ifdef CONFIG_SND_DEBUG
245                 if (!timeout)
246                         snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
247                                    mpu->read(mpu, MPU401C(mpu)));
248 #endif
249         }
250         mpu->write(mpu, cmd, MPU401C(mpu));
251         if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
252                 ok = 0;
253                 timeout = 10000;
254                 while (!ok && timeout-- > 0) {
255                         if (snd_mpu401_input_avail(mpu)) {
256                                 if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
257                                         ok = 1;
258                         }
259                 }
260                 if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
261                         ok = 1;
262         } else
263                 ok = 1;
264         spin_unlock_irqrestore(&mpu->input_lock, flags);
265         if (!ok) {
266                 snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
267                            "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
268                            mpu->read(mpu, MPU401C(mpu)),
269                            mpu->read(mpu, MPU401D(mpu)));
270                 return 1;
271         }
272         return 0;
273 }
274 
275 static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
276 {
277         if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
278                 return -EIO;
279         if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
280                 return -EIO;
281         return 0;
282 }
283 
284 /*
285  * input/output open/close - protected by open_mutex in rawmidi.c
286  */
287 static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
288 {
289         struct snd_mpu401 *mpu;
290         int err;
291 
292         mpu = substream->rmidi->private_data;
293         if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
294                 return err;
295         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
296                 if (snd_mpu401_do_reset(mpu) < 0)
297                         goto error_out;
298         }
299         mpu->substream_input = substream;
300         set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
301         return 0;
302 
303 error_out:
304         if (mpu->open_input && mpu->close_input)
305                 mpu->close_input(mpu);
306         return -EIO;
307 }
308 
309 static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
310 {
311         struct snd_mpu401 *mpu;
312         int err;
313 
314         mpu = substream->rmidi->private_data;
315         if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
316                 return err;
317         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
318                 if (snd_mpu401_do_reset(mpu) < 0)
319                         goto error_out;
320         }
321         mpu->substream_output = substream;
322         set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
323         return 0;
324 
325 error_out:
326         if (mpu->open_output && mpu->close_output)
327                 mpu->close_output(mpu);
328         return -EIO;
329 }
330 
331 static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
332 {
333         struct snd_mpu401 *mpu;
334         int err = 0;
335 
336         mpu = substream->rmidi->private_data;
337         clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
338         mpu->substream_input = NULL;
339         if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
340                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
341         if (mpu->close_input)
342                 mpu->close_input(mpu);
343         if (err)
344                 return -EIO;
345         return 0;
346 }
347 
348 static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
349 {
350         struct snd_mpu401 *mpu;
351         int err = 0;
352 
353         mpu = substream->rmidi->private_data;
354         clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
355         mpu->substream_output = NULL;
356         if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
357                 err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
358         if (mpu->close_output)
359                 mpu->close_output(mpu);
360         if (err)
361                 return -EIO;
362         return 0;
363 }
364 
365 /*
366  * trigger input callback
367  */
368 static void
369 snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
370 {
371         unsigned long flags;
372         struct snd_mpu401 *mpu;
373         int max = 64;
374 
375         mpu = substream->rmidi->private_data;
376         if (up) {
377                 if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
378                                        &mpu->mode)) {
379                         /* first time - flush FIFO */
380                         while (max-- > 0)
381                                 mpu->read(mpu, MPU401D(mpu));
382                         if (mpu->info_flags & MPU401_INFO_USE_TIMER)
383                                 snd_mpu401_uart_add_timer(mpu, 1);
384                 }
385                 
386                 /* read data in advance */
387                 spin_lock_irqsave(&mpu->input_lock, flags);
388                 snd_mpu401_uart_input_read(mpu);
389                 spin_unlock_irqrestore(&mpu->input_lock, flags);
390         } else {
391                 if (mpu->info_flags & MPU401_INFO_USE_TIMER)
392                         snd_mpu401_uart_remove_timer(mpu, 1);
393                 clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
394         }
395 
396 }
397 
398 /*
399  * transfer input pending data
400  * call with input_lock spinlock held
401  */
402 static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
403 {
404         int max = 128;
405         unsigned char byte;
406 
407         while (max-- > 0) {
408                 if (! snd_mpu401_input_avail(mpu))
409                         break; /* input not available */
410                 byte = mpu->read(mpu, MPU401D(mpu));
411                 if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
412                         snd_rawmidi_receive(mpu->substream_input, &byte, 1);
413         }
414 }
415 
416 /*
417  *  Tx FIFO sizes:
418  *    CS4237B                   - 16 bytes
419  *    AudioDrive ES1688         - 12 bytes
420  *    S3 SonicVibes             -  8 bytes
421  *    SoundBlaster AWE 64       -  2 bytes (ugly hardware)
422  */
423 
424 /*
425  * write output pending bytes
426  * call with output_lock spinlock held
427  */
428 static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
429 {
430         unsigned char byte;
431         int max = 256;
432 
433         do {
434                 if (snd_rawmidi_transmit_peek(mpu->substream_output,
435                                               &byte, 1) == 1) {
436                         /*
437                          * Try twice because there is hardware that insists on
438                          * setting the output busy bit after each write.
439                          */
440                         if (!snd_mpu401_output_ready(mpu) &&
441                             !snd_mpu401_output_ready(mpu))
442                                 break;  /* Tx FIFO full - try again later */
443                         mpu->write(mpu, byte, MPU401D(mpu));
444                         snd_rawmidi_transmit_ack(mpu->substream_output, 1);
445                 } else {
446                         snd_mpu401_uart_remove_timer (mpu, 0);
447                         break;  /* no other data - leave the tx loop */
448                 }
449         } while (--max > 0);
450 }
451 
452 /*
453  * output trigger callback
454  */
455 static void
456 snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
457 {
458         unsigned long flags;
459         struct snd_mpu401 *mpu;
460 
461         mpu = substream->rmidi->private_data;
462         if (up) {
463                 set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
464 
465                 /* try to add the timer at each output trigger,
466                  * since the output timer might have been removed in
467                  * snd_mpu401_uart_output_write().
468                  */
469                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
470                         snd_mpu401_uart_add_timer(mpu, 0);
471 
472                 /* output pending data */
473                 spin_lock_irqsave(&mpu->output_lock, flags);
474                 snd_mpu401_uart_output_write(mpu);
475                 spin_unlock_irqrestore(&mpu->output_lock, flags);
476         } else {
477                 if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
478                         snd_mpu401_uart_remove_timer(mpu, 0);
479                 clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
480         }
481 }
482 
483 /*
484 
485  */
486 
487 static struct snd_rawmidi_ops snd_mpu401_uart_output =
488 {
489         .open =         snd_mpu401_uart_output_open,
490         .close =        snd_mpu401_uart_output_close,
491         .trigger =      snd_mpu401_uart_output_trigger,
492 };
493 
494 static struct snd_rawmidi_ops snd_mpu401_uart_input =
495 {
496         .open =         snd_mpu401_uart_input_open,
497         .close =        snd_mpu401_uart_input_close,
498         .trigger =      snd_mpu401_uart_input_trigger,
499 };
500 
501 static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
502 {
503         struct snd_mpu401 *mpu = rmidi->private_data;
504         if (mpu->irq >= 0)
505                 free_irq(mpu->irq, (void *) mpu);
506         release_and_free_resource(mpu->res);
507         kfree(mpu);
508 }
509 
510 /**
511  * snd_mpu401_uart_new - create an MPU401-UART instance
512  * @card: the card instance
513  * @device: the device index, zero-based
514  * @hardware: the hardware type, MPU401_HW_XXXX
515  * @port: the base address of MPU401 port
516  * @info_flags: bitflags MPU401_INFO_XXX
517  * @irq: the ISA irq number, -1 if not to be allocated
518  * @rrawmidi: the pointer to store the new rawmidi instance
519  *
520  * Creates a new MPU-401 instance.
521  *
522  * Note that the rawmidi instance is returned on the rrawmidi argument,
523  * not the mpu401 instance itself.  To access to the mpu401 instance,
524  * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
525  *
526  * Return: Zero if successful, or a negative error code.
527  */
528 int snd_mpu401_uart_new(struct snd_card *card, int device,
529                         unsigned short hardware,
530                         unsigned long port,
531                         unsigned int info_flags,
532                         int irq,
533                         struct snd_rawmidi ** rrawmidi)
534 {
535         struct snd_mpu401 *mpu;
536         struct snd_rawmidi *rmidi;
537         int in_enable, out_enable;
538         int err;
539 
540         if (rrawmidi)
541                 *rrawmidi = NULL;
542         if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
543                 info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
544         in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
545         out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
546         if ((err = snd_rawmidi_new(card, "MPU-401U", device,
547                                    out_enable, in_enable, &rmidi)) < 0)
548                 return err;
549         mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
550         if (mpu == NULL) {
551                 snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
552                 snd_device_free(card, rmidi);
553                 return -ENOMEM;
554         }
555         rmidi->private_data = mpu;
556         rmidi->private_free = snd_mpu401_uart_free;
557         spin_lock_init(&mpu->input_lock);
558         spin_lock_init(&mpu->output_lock);
559         spin_lock_init(&mpu->timer_lock);
560         mpu->hardware = hardware;
561         mpu->irq = -1;
562         if (! (info_flags & MPU401_INFO_INTEGRATED)) {
563                 int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
564                 mpu->res = request_region(port, res_size, "MPU401 UART");
565                 if (mpu->res == NULL) {
566                         snd_printk(KERN_ERR "mpu401_uart: "
567                                    "unable to grab port 0x%lx size %d\n",
568                                    port, res_size);
569                         snd_device_free(card, rmidi);
570                         return -EBUSY;
571                 }
572         }
573         if (info_flags & MPU401_INFO_MMIO) {
574                 mpu->write = mpu401_write_mmio;
575                 mpu->read = mpu401_read_mmio;
576         } else {
577                 mpu->write = mpu401_write_port;
578                 mpu->read = mpu401_read_port;
579         }
580         mpu->port = port;
581         if (hardware == MPU401_HW_PC98II)
582                 mpu->cport = port + 2;
583         else
584                 mpu->cport = port + 1;
585         if (irq >= 0) {
586                 if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
587                                 "MPU401 UART", (void *) mpu)) {
588                         snd_printk(KERN_ERR "mpu401_uart: "
589                                    "unable to grab IRQ %d\n", irq);
590                         snd_device_free(card, rmidi);
591                         return -EBUSY;
592                 }
593         }
594         if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
595                 info_flags |= MPU401_INFO_USE_TIMER;
596         mpu->info_flags = info_flags;
597         mpu->irq = irq;
598         if (card->shortname[0])
599                 snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
600                          card->shortname);
601         else
602                 sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
603         if (out_enable) {
604                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
605                                     &snd_mpu401_uart_output);
606                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
607         }
608         if (in_enable) {
609                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
610                                     &snd_mpu401_uart_input);
611                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
612                 if (out_enable)
613                         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
614         }
615         mpu->rmidi = rmidi;
616         if (rrawmidi)
617                 *rrawmidi = rmidi;
618         return 0;
619 }
620 
621 EXPORT_SYMBOL(snd_mpu401_uart_new);
622 
623 /*
624  *  INIT part
625  */
626 
627 static int __init alsa_mpu401_uart_init(void)
628 {
629         return 0;
630 }
631 
632 static void __exit alsa_mpu401_uart_exit(void)
633 {
634 }
635 
636 module_init(alsa_mpu401_uart_init)
637 module_exit(alsa_mpu401_uart_exit)
638 

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