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TOMOYO Linux Cross Reference
Linux/sound/core/rawmidi.c

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  1 /*
  2  *  Abstract layer for MIDI v1.0 stream
  3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  4  *
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  *
 20  */
 21 
 22 #include <sound/core.h>
 23 #include <linux/major.h>
 24 #include <linux/init.h>
 25 #include <linux/sched/signal.h>
 26 #include <linux/slab.h>
 27 #include <linux/time.h>
 28 #include <linux/wait.h>
 29 #include <linux/mutex.h>
 30 #include <linux/module.h>
 31 #include <linux/delay.h>
 32 #include <sound/rawmidi.h>
 33 #include <sound/info.h>
 34 #include <sound/control.h>
 35 #include <sound/minors.h>
 36 #include <sound/initval.h>
 37 
 38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 39 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
 40 MODULE_LICENSE("GPL");
 41 
 42 #ifdef CONFIG_SND_OSSEMUL
 43 static int midi_map[SNDRV_CARDS];
 44 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
 45 module_param_array(midi_map, int, NULL, 0444);
 46 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
 47 module_param_array(amidi_map, int, NULL, 0444);
 48 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
 49 #endif /* CONFIG_SND_OSSEMUL */
 50 
 51 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
 52 static int snd_rawmidi_dev_free(struct snd_device *device);
 53 static int snd_rawmidi_dev_register(struct snd_device *device);
 54 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
 55 
 56 static LIST_HEAD(snd_rawmidi_devices);
 57 static DEFINE_MUTEX(register_mutex);
 58 
 59 #define rmidi_err(rmidi, fmt, args...) \
 60         dev_err(&(rmidi)->dev, fmt, ##args)
 61 #define rmidi_warn(rmidi, fmt, args...) \
 62         dev_warn(&(rmidi)->dev, fmt, ##args)
 63 #define rmidi_dbg(rmidi, fmt, args...) \
 64         dev_dbg(&(rmidi)->dev, fmt, ##args)
 65 
 66 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
 67 {
 68         struct snd_rawmidi *rawmidi;
 69 
 70         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
 71                 if (rawmidi->card == card && rawmidi->device == device)
 72                         return rawmidi;
 73         return NULL;
 74 }
 75 
 76 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
 77 {
 78         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
 79         case FMODE_WRITE:
 80                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
 81         case FMODE_READ:
 82                 return SNDRV_RAWMIDI_LFLG_INPUT;
 83         default:
 84                 return SNDRV_RAWMIDI_LFLG_OPEN;
 85         }
 86 }
 87 
 88 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
 89 {
 90         struct snd_rawmidi_runtime *runtime = substream->runtime;
 91         return runtime->avail >= runtime->avail_min;
 92 }
 93 
 94 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 95                                            size_t count)
 96 {
 97         struct snd_rawmidi_runtime *runtime = substream->runtime;
 98         return runtime->avail >= runtime->avail_min &&
 99                (!substream->append || runtime->avail >= count);
100 }
101 
102 static void snd_rawmidi_input_event_work(struct work_struct *work)
103 {
104         struct snd_rawmidi_runtime *runtime =
105                 container_of(work, struct snd_rawmidi_runtime, event_work);
106         if (runtime->event)
107                 runtime->event(runtime->substream);
108 }
109 
110 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
111 {
112         struct snd_rawmidi_runtime *runtime;
113 
114         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
115                 return -ENOMEM;
116         runtime->substream = substream;
117         spin_lock_init(&runtime->lock);
118         init_waitqueue_head(&runtime->sleep);
119         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
120         runtime->event = NULL;
121         runtime->buffer_size = PAGE_SIZE;
122         runtime->avail_min = 1;
123         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
124                 runtime->avail = 0;
125         else
126                 runtime->avail = runtime->buffer_size;
127         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
128                 kfree(runtime);
129                 return -ENOMEM;
130         }
131         runtime->appl_ptr = runtime->hw_ptr = 0;
132         substream->runtime = runtime;
133         return 0;
134 }
135 
136 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
137 {
138         struct snd_rawmidi_runtime *runtime = substream->runtime;
139 
140         kfree(runtime->buffer);
141         kfree(runtime);
142         substream->runtime = NULL;
143         return 0;
144 }
145 
146 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
147 {
148         if (!substream->opened)
149                 return;
150         substream->ops->trigger(substream, up);
151 }
152 
153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154 {
155         if (!substream->opened)
156                 return;
157         substream->ops->trigger(substream, up);
158         if (!up)
159                 cancel_work_sync(&substream->runtime->event_work);
160 }
161 
162 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
163 {
164         unsigned long flags;
165         struct snd_rawmidi_runtime *runtime = substream->runtime;
166 
167         snd_rawmidi_output_trigger(substream, 0);
168         runtime->drain = 0;
169         spin_lock_irqsave(&runtime->lock, flags);
170         runtime->appl_ptr = runtime->hw_ptr = 0;
171         runtime->avail = runtime->buffer_size;
172         spin_unlock_irqrestore(&runtime->lock, flags);
173         return 0;
174 }
175 EXPORT_SYMBOL(snd_rawmidi_drop_output);
176 
177 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
178 {
179         int err;
180         long timeout;
181         struct snd_rawmidi_runtime *runtime = substream->runtime;
182 
183         err = 0;
184         runtime->drain = 1;
185         timeout = wait_event_interruptible_timeout(runtime->sleep,
186                                 (runtime->avail >= runtime->buffer_size),
187                                 10*HZ);
188         if (signal_pending(current))
189                 err = -ERESTARTSYS;
190         if (runtime->avail < runtime->buffer_size && !timeout) {
191                 rmidi_warn(substream->rmidi,
192                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
193                            (long)runtime->avail, (long)runtime->buffer_size);
194                 err = -EIO;
195         }
196         runtime->drain = 0;
197         if (err != -ERESTARTSYS) {
198                 /* we need wait a while to make sure that Tx FIFOs are empty */
199                 if (substream->ops->drain)
200                         substream->ops->drain(substream);
201                 else
202                         msleep(50);
203                 snd_rawmidi_drop_output(substream);
204         }
205         return err;
206 }
207 EXPORT_SYMBOL(snd_rawmidi_drain_output);
208 
209 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
210 {
211         unsigned long flags;
212         struct snd_rawmidi_runtime *runtime = substream->runtime;
213 
214         snd_rawmidi_input_trigger(substream, 0);
215         runtime->drain = 0;
216         spin_lock_irqsave(&runtime->lock, flags);
217         runtime->appl_ptr = runtime->hw_ptr = 0;
218         runtime->avail = 0;
219         spin_unlock_irqrestore(&runtime->lock, flags);
220         return 0;
221 }
222 EXPORT_SYMBOL(snd_rawmidi_drain_input);
223 
224 /* look for an available substream for the given stream direction;
225  * if a specific subdevice is given, try to assign it
226  */
227 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
228                             int stream, int mode,
229                             struct snd_rawmidi_substream **sub_ret)
230 {
231         struct snd_rawmidi_substream *substream;
232         struct snd_rawmidi_str *s = &rmidi->streams[stream];
233         static unsigned int info_flags[2] = {
234                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
235                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
236         };
237 
238         if (!(rmidi->info_flags & info_flags[stream]))
239                 return -ENXIO;
240         if (subdevice >= 0 && subdevice >= s->substream_count)
241                 return -ENODEV;
242 
243         list_for_each_entry(substream, &s->substreams, list) {
244                 if (substream->opened) {
245                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
246                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
247                             !substream->append)
248                                 continue;
249                 }
250                 if (subdevice < 0 || subdevice == substream->number) {
251                         *sub_ret = substream;
252                         return 0;
253                 }
254         }
255         return -EAGAIN;
256 }
257 
258 /* open and do ref-counting for the given substream */
259 static int open_substream(struct snd_rawmidi *rmidi,
260                           struct snd_rawmidi_substream *substream,
261                           int mode)
262 {
263         int err;
264 
265         if (substream->use_count == 0) {
266                 err = snd_rawmidi_runtime_create(substream);
267                 if (err < 0)
268                         return err;
269                 err = substream->ops->open(substream);
270                 if (err < 0) {
271                         snd_rawmidi_runtime_free(substream);
272                         return err;
273                 }
274                 substream->opened = 1;
275                 substream->active_sensing = 0;
276                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
277                         substream->append = 1;
278                 substream->pid = get_pid(task_pid(current));
279                 rmidi->streams[substream->stream].substream_opened++;
280         }
281         substream->use_count++;
282         return 0;
283 }
284 
285 static void close_substream(struct snd_rawmidi *rmidi,
286                             struct snd_rawmidi_substream *substream,
287                             int cleanup);
288 
289 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
290                              struct snd_rawmidi_file *rfile)
291 {
292         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
293         int err;
294 
295         rfile->input = rfile->output = NULL;
296         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
297                 err = assign_substream(rmidi, subdevice,
298                                        SNDRV_RAWMIDI_STREAM_INPUT,
299                                        mode, &sinput);
300                 if (err < 0)
301                         return err;
302         }
303         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
304                 err = assign_substream(rmidi, subdevice,
305                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
306                                        mode, &soutput);
307                 if (err < 0)
308                         return err;
309         }
310 
311         if (sinput) {
312                 err = open_substream(rmidi, sinput, mode);
313                 if (err < 0)
314                         return err;
315         }
316         if (soutput) {
317                 err = open_substream(rmidi, soutput, mode);
318                 if (err < 0) {
319                         if (sinput)
320                                 close_substream(rmidi, sinput, 0);
321                         return err;
322                 }
323         }
324 
325         rfile->rmidi = rmidi;
326         rfile->input = sinput;
327         rfile->output = soutput;
328         return 0;
329 }
330 
331 /* called from sound/core/seq/seq_midi.c */
332 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
333                             int mode, struct snd_rawmidi_file * rfile)
334 {
335         struct snd_rawmidi *rmidi;
336         int err;
337 
338         if (snd_BUG_ON(!rfile))
339                 return -EINVAL;
340 
341         mutex_lock(&register_mutex);
342         rmidi = snd_rawmidi_search(card, device);
343         if (rmidi == NULL) {
344                 mutex_unlock(&register_mutex);
345                 return -ENODEV;
346         }
347         if (!try_module_get(rmidi->card->module)) {
348                 mutex_unlock(&register_mutex);
349                 return -ENXIO;
350         }
351         mutex_unlock(&register_mutex);
352 
353         mutex_lock(&rmidi->open_mutex);
354         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
355         mutex_unlock(&rmidi->open_mutex);
356         if (err < 0)
357                 module_put(rmidi->card->module);
358         return err;
359 }
360 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
361 
362 static int snd_rawmidi_open(struct inode *inode, struct file *file)
363 {
364         int maj = imajor(inode);
365         struct snd_card *card;
366         int subdevice;
367         unsigned short fflags;
368         int err;
369         struct snd_rawmidi *rmidi;
370         struct snd_rawmidi_file *rawmidi_file = NULL;
371         wait_queue_entry_t wait;
372 
373         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 
374                 return -EINVAL;         /* invalid combination */
375 
376         err = nonseekable_open(inode, file);
377         if (err < 0)
378                 return err;
379 
380         if (maj == snd_major) {
381                 rmidi = snd_lookup_minor_data(iminor(inode),
382                                               SNDRV_DEVICE_TYPE_RAWMIDI);
383 #ifdef CONFIG_SND_OSSEMUL
384         } else if (maj == SOUND_MAJOR) {
385                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
386                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
387 #endif
388         } else
389                 return -ENXIO;
390 
391         if (rmidi == NULL)
392                 return -ENODEV;
393 
394         if (!try_module_get(rmidi->card->module)) {
395                 snd_card_unref(rmidi->card);
396                 return -ENXIO;
397         }
398 
399         mutex_lock(&rmidi->open_mutex);
400         card = rmidi->card;
401         err = snd_card_file_add(card, file);
402         if (err < 0)
403                 goto __error_card;
404         fflags = snd_rawmidi_file_flags(file);
405         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
406                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
407         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
408         if (rawmidi_file == NULL) {
409                 err = -ENOMEM;
410                 goto __error;
411         }
412         init_waitqueue_entry(&wait, current);
413         add_wait_queue(&rmidi->open_wait, &wait);
414         while (1) {
415                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
416                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
417                 if (err >= 0)
418                         break;
419                 if (err == -EAGAIN) {
420                         if (file->f_flags & O_NONBLOCK) {
421                                 err = -EBUSY;
422                                 break;
423                         }
424                 } else
425                         break;
426                 set_current_state(TASK_INTERRUPTIBLE);
427                 mutex_unlock(&rmidi->open_mutex);
428                 schedule();
429                 mutex_lock(&rmidi->open_mutex);
430                 if (rmidi->card->shutdown) {
431                         err = -ENODEV;
432                         break;
433                 }
434                 if (signal_pending(current)) {
435                         err = -ERESTARTSYS;
436                         break;
437                 }
438         }
439         remove_wait_queue(&rmidi->open_wait, &wait);
440         if (err < 0) {
441                 kfree(rawmidi_file);
442                 goto __error;
443         }
444 #ifdef CONFIG_SND_OSSEMUL
445         if (rawmidi_file->input && rawmidi_file->input->runtime)
446                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
447         if (rawmidi_file->output && rawmidi_file->output->runtime)
448                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
449 #endif
450         file->private_data = rawmidi_file;
451         mutex_unlock(&rmidi->open_mutex);
452         snd_card_unref(rmidi->card);
453         return 0;
454 
455  __error:
456         snd_card_file_remove(card, file);
457  __error_card:
458         mutex_unlock(&rmidi->open_mutex);
459         module_put(rmidi->card->module);
460         snd_card_unref(rmidi->card);
461         return err;
462 }
463 
464 static void close_substream(struct snd_rawmidi *rmidi,
465                             struct snd_rawmidi_substream *substream,
466                             int cleanup)
467 {
468         if (--substream->use_count)
469                 return;
470 
471         if (cleanup) {
472                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
473                         snd_rawmidi_input_trigger(substream, 0);
474                 else {
475                         if (substream->active_sensing) {
476                                 unsigned char buf = 0xfe;
477                                 /* sending single active sensing message
478                                  * to shut the device up
479                                  */
480                                 snd_rawmidi_kernel_write(substream, &buf, 1);
481                         }
482                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
483                                 snd_rawmidi_output_trigger(substream, 0);
484                 }
485         }
486         substream->ops->close(substream);
487         if (substream->runtime->private_free)
488                 substream->runtime->private_free(substream);
489         snd_rawmidi_runtime_free(substream);
490         substream->opened = 0;
491         substream->append = 0;
492         put_pid(substream->pid);
493         substream->pid = NULL;
494         rmidi->streams[substream->stream].substream_opened--;
495 }
496 
497 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
498 {
499         struct snd_rawmidi *rmidi;
500 
501         rmidi = rfile->rmidi;
502         mutex_lock(&rmidi->open_mutex);
503         if (rfile->input) {
504                 close_substream(rmidi, rfile->input, 1);
505                 rfile->input = NULL;
506         }
507         if (rfile->output) {
508                 close_substream(rmidi, rfile->output, 1);
509                 rfile->output = NULL;
510         }
511         rfile->rmidi = NULL;
512         mutex_unlock(&rmidi->open_mutex);
513         wake_up(&rmidi->open_wait);
514 }
515 
516 /* called from sound/core/seq/seq_midi.c */
517 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
518 {
519         struct snd_rawmidi *rmidi;
520 
521         if (snd_BUG_ON(!rfile))
522                 return -ENXIO;
523         
524         rmidi = rfile->rmidi;
525         rawmidi_release_priv(rfile);
526         module_put(rmidi->card->module);
527         return 0;
528 }
529 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
530 
531 static int snd_rawmidi_release(struct inode *inode, struct file *file)
532 {
533         struct snd_rawmidi_file *rfile;
534         struct snd_rawmidi *rmidi;
535         struct module *module;
536 
537         rfile = file->private_data;
538         rmidi = rfile->rmidi;
539         rawmidi_release_priv(rfile);
540         kfree(rfile);
541         module = rmidi->card->module;
542         snd_card_file_remove(rmidi->card, file);
543         module_put(module);
544         return 0;
545 }
546 
547 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
548                             struct snd_rawmidi_info *info)
549 {
550         struct snd_rawmidi *rmidi;
551         
552         if (substream == NULL)
553                 return -ENODEV;
554         rmidi = substream->rmidi;
555         memset(info, 0, sizeof(*info));
556         info->card = rmidi->card->number;
557         info->device = rmidi->device;
558         info->subdevice = substream->number;
559         info->stream = substream->stream;
560         info->flags = rmidi->info_flags;
561         strcpy(info->id, rmidi->id);
562         strcpy(info->name, rmidi->name);
563         strcpy(info->subname, substream->name);
564         info->subdevices_count = substream->pstr->substream_count;
565         info->subdevices_avail = (substream->pstr->substream_count -
566                                   substream->pstr->substream_opened);
567         return 0;
568 }
569 
570 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
571                                  struct snd_rawmidi_info __user * _info)
572 {
573         struct snd_rawmidi_info info;
574         int err;
575         if ((err = snd_rawmidi_info(substream, &info)) < 0)
576                 return err;
577         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
578                 return -EFAULT;
579         return 0;
580 }
581 
582 static int __snd_rawmidi_info_select(struct snd_card *card,
583                                      struct snd_rawmidi_info *info)
584 {
585         struct snd_rawmidi *rmidi;
586         struct snd_rawmidi_str *pstr;
587         struct snd_rawmidi_substream *substream;
588 
589         rmidi = snd_rawmidi_search(card, info->device);
590         if (!rmidi)
591                 return -ENXIO;
592         if (info->stream < 0 || info->stream > 1)
593                 return -EINVAL;
594         pstr = &rmidi->streams[info->stream];
595         if (pstr->substream_count == 0)
596                 return -ENOENT;
597         if (info->subdevice >= pstr->substream_count)
598                 return -ENXIO;
599         list_for_each_entry(substream, &pstr->substreams, list) {
600                 if ((unsigned int)substream->number == info->subdevice)
601                         return snd_rawmidi_info(substream, info);
602         }
603         return -ENXIO;
604 }
605 
606 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
607 {
608         int ret;
609 
610         mutex_lock(&register_mutex);
611         ret = __snd_rawmidi_info_select(card, info);
612         mutex_unlock(&register_mutex);
613         return ret;
614 }
615 EXPORT_SYMBOL(snd_rawmidi_info_select);
616 
617 static int snd_rawmidi_info_select_user(struct snd_card *card,
618                                         struct snd_rawmidi_info __user *_info)
619 {
620         int err;
621         struct snd_rawmidi_info info;
622         if (get_user(info.device, &_info->device))
623                 return -EFAULT;
624         if (get_user(info.stream, &_info->stream))
625                 return -EFAULT;
626         if (get_user(info.subdevice, &_info->subdevice))
627                 return -EFAULT;
628         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
629                 return err;
630         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
631                 return -EFAULT;
632         return 0;
633 }
634 
635 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
636                               struct snd_rawmidi_params * params)
637 {
638         char *newbuf, *oldbuf;
639         struct snd_rawmidi_runtime *runtime = substream->runtime;
640         
641         if (substream->append && substream->use_count > 1)
642                 return -EBUSY;
643         snd_rawmidi_drain_output(substream);
644         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
645                 return -EINVAL;
646         }
647         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
648                 return -EINVAL;
649         }
650         if (params->buffer_size != runtime->buffer_size) {
651                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
652                 if (!newbuf)
653                         return -ENOMEM;
654                 spin_lock_irq(&runtime->lock);
655                 oldbuf = runtime->buffer;
656                 runtime->buffer = newbuf;
657                 runtime->buffer_size = params->buffer_size;
658                 runtime->avail = runtime->buffer_size;
659                 runtime->appl_ptr = runtime->hw_ptr = 0;
660                 spin_unlock_irq(&runtime->lock);
661                 kfree(oldbuf);
662         }
663         runtime->avail_min = params->avail_min;
664         substream->active_sensing = !params->no_active_sensing;
665         return 0;
666 }
667 EXPORT_SYMBOL(snd_rawmidi_output_params);
668 
669 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
670                              struct snd_rawmidi_params * params)
671 {
672         char *newbuf, *oldbuf;
673         struct snd_rawmidi_runtime *runtime = substream->runtime;
674 
675         snd_rawmidi_drain_input(substream);
676         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
677                 return -EINVAL;
678         }
679         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
680                 return -EINVAL;
681         }
682         if (params->buffer_size != runtime->buffer_size) {
683                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
684                 if (!newbuf)
685                         return -ENOMEM;
686                 spin_lock_irq(&runtime->lock);
687                 oldbuf = runtime->buffer;
688                 runtime->buffer = newbuf;
689                 runtime->buffer_size = params->buffer_size;
690                 runtime->appl_ptr = runtime->hw_ptr = 0;
691                 spin_unlock_irq(&runtime->lock);
692                 kfree(oldbuf);
693         }
694         runtime->avail_min = params->avail_min;
695         return 0;
696 }
697 EXPORT_SYMBOL(snd_rawmidi_input_params);
698 
699 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
700                                      struct snd_rawmidi_status * status)
701 {
702         struct snd_rawmidi_runtime *runtime = substream->runtime;
703 
704         memset(status, 0, sizeof(*status));
705         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
706         spin_lock_irq(&runtime->lock);
707         status->avail = runtime->avail;
708         spin_unlock_irq(&runtime->lock);
709         return 0;
710 }
711 
712 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
713                                     struct snd_rawmidi_status * status)
714 {
715         struct snd_rawmidi_runtime *runtime = substream->runtime;
716 
717         memset(status, 0, sizeof(*status));
718         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
719         spin_lock_irq(&runtime->lock);
720         status->avail = runtime->avail;
721         status->xruns = runtime->xruns;
722         runtime->xruns = 0;
723         spin_unlock_irq(&runtime->lock);
724         return 0;
725 }
726 
727 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
728 {
729         struct snd_rawmidi_file *rfile;
730         void __user *argp = (void __user *)arg;
731 
732         rfile = file->private_data;
733         if (((cmd >> 8) & 0xff) != 'W')
734                 return -ENOTTY;
735         switch (cmd) {
736         case SNDRV_RAWMIDI_IOCTL_PVERSION:
737                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
738         case SNDRV_RAWMIDI_IOCTL_INFO:
739         {
740                 int stream;
741                 struct snd_rawmidi_info __user *info = argp;
742                 if (get_user(stream, &info->stream))
743                         return -EFAULT;
744                 switch (stream) {
745                 case SNDRV_RAWMIDI_STREAM_INPUT:
746                         return snd_rawmidi_info_user(rfile->input, info);
747                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
748                         return snd_rawmidi_info_user(rfile->output, info);
749                 default:
750                         return -EINVAL;
751                 }
752         }
753         case SNDRV_RAWMIDI_IOCTL_PARAMS:
754         {
755                 struct snd_rawmidi_params params;
756                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
757                         return -EFAULT;
758                 switch (params.stream) {
759                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
760                         if (rfile->output == NULL)
761                                 return -EINVAL;
762                         return snd_rawmidi_output_params(rfile->output, &params);
763                 case SNDRV_RAWMIDI_STREAM_INPUT:
764                         if (rfile->input == NULL)
765                                 return -EINVAL;
766                         return snd_rawmidi_input_params(rfile->input, &params);
767                 default:
768                         return -EINVAL;
769                 }
770         }
771         case SNDRV_RAWMIDI_IOCTL_STATUS:
772         {
773                 int err = 0;
774                 struct snd_rawmidi_status status;
775                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
776                         return -EFAULT;
777                 switch (status.stream) {
778                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
779                         if (rfile->output == NULL)
780                                 return -EINVAL;
781                         err = snd_rawmidi_output_status(rfile->output, &status);
782                         break;
783                 case SNDRV_RAWMIDI_STREAM_INPUT:
784                         if (rfile->input == NULL)
785                                 return -EINVAL;
786                         err = snd_rawmidi_input_status(rfile->input, &status);
787                         break;
788                 default:
789                         return -EINVAL;
790                 }
791                 if (err < 0)
792                         return err;
793                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
794                         return -EFAULT;
795                 return 0;
796         }
797         case SNDRV_RAWMIDI_IOCTL_DROP:
798         {
799                 int val;
800                 if (get_user(val, (int __user *) argp))
801                         return -EFAULT;
802                 switch (val) {
803                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
804                         if (rfile->output == NULL)
805                                 return -EINVAL;
806                         return snd_rawmidi_drop_output(rfile->output);
807                 default:
808                         return -EINVAL;
809                 }
810         }
811         case SNDRV_RAWMIDI_IOCTL_DRAIN:
812         {
813                 int val;
814                 if (get_user(val, (int __user *) argp))
815                         return -EFAULT;
816                 switch (val) {
817                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
818                         if (rfile->output == NULL)
819                                 return -EINVAL;
820                         return snd_rawmidi_drain_output(rfile->output);
821                 case SNDRV_RAWMIDI_STREAM_INPUT:
822                         if (rfile->input == NULL)
823                                 return -EINVAL;
824                         return snd_rawmidi_drain_input(rfile->input);
825                 default:
826                         return -EINVAL;
827                 }
828         }
829         default:
830                 rmidi_dbg(rfile->rmidi,
831                           "rawmidi: unknown command = 0x%x\n", cmd);
832         }
833         return -ENOTTY;
834 }
835 
836 static int snd_rawmidi_control_ioctl(struct snd_card *card,
837                                      struct snd_ctl_file *control,
838                                      unsigned int cmd,
839                                      unsigned long arg)
840 {
841         void __user *argp = (void __user *)arg;
842 
843         switch (cmd) {
844         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
845         {
846                 int device;
847                 
848                 if (get_user(device, (int __user *)argp))
849                         return -EFAULT;
850                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
851                         device = SNDRV_RAWMIDI_DEVICES - 1;
852                 mutex_lock(&register_mutex);
853                 device = device < 0 ? 0 : device + 1;
854                 while (device < SNDRV_RAWMIDI_DEVICES) {
855                         if (snd_rawmidi_search(card, device))
856                                 break;
857                         device++;
858                 }
859                 if (device == SNDRV_RAWMIDI_DEVICES)
860                         device = -1;
861                 mutex_unlock(&register_mutex);
862                 if (put_user(device, (int __user *)argp))
863                         return -EFAULT;
864                 return 0;
865         }
866         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
867         {
868                 int val;
869                 
870                 if (get_user(val, (int __user *)argp))
871                         return -EFAULT;
872                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
873                 return 0;
874         }
875         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
876                 return snd_rawmidi_info_select_user(card, argp);
877         }
878         return -ENOIOCTLCMD;
879 }
880 
881 /**
882  * snd_rawmidi_receive - receive the input data from the device
883  * @substream: the rawmidi substream
884  * @buffer: the buffer pointer
885  * @count: the data size to read
886  *
887  * Reads the data from the internal buffer.
888  *
889  * Return: The size of read data, or a negative error code on failure.
890  */
891 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
892                         const unsigned char *buffer, int count)
893 {
894         unsigned long flags;
895         int result = 0, count1;
896         struct snd_rawmidi_runtime *runtime = substream->runtime;
897 
898         if (!substream->opened)
899                 return -EBADFD;
900         if (runtime->buffer == NULL) {
901                 rmidi_dbg(substream->rmidi,
902                           "snd_rawmidi_receive: input is not active!!!\n");
903                 return -EINVAL;
904         }
905         spin_lock_irqsave(&runtime->lock, flags);
906         if (count == 1) {       /* special case, faster code */
907                 substream->bytes++;
908                 if (runtime->avail < runtime->buffer_size) {
909                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
910                         runtime->hw_ptr %= runtime->buffer_size;
911                         runtime->avail++;
912                         result++;
913                 } else {
914                         runtime->xruns++;
915                 }
916         } else {
917                 substream->bytes += count;
918                 count1 = runtime->buffer_size - runtime->hw_ptr;
919                 if (count1 > count)
920                         count1 = count;
921                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
922                         count1 = runtime->buffer_size - runtime->avail;
923                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
924                 runtime->hw_ptr += count1;
925                 runtime->hw_ptr %= runtime->buffer_size;
926                 runtime->avail += count1;
927                 count -= count1;
928                 result += count1;
929                 if (count > 0) {
930                         buffer += count1;
931                         count1 = count;
932                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
933                                 count1 = runtime->buffer_size - runtime->avail;
934                                 runtime->xruns += count - count1;
935                         }
936                         if (count1 > 0) {
937                                 memcpy(runtime->buffer, buffer, count1);
938                                 runtime->hw_ptr = count1;
939                                 runtime->avail += count1;
940                                 result += count1;
941                         }
942                 }
943         }
944         if (result > 0) {
945                 if (runtime->event)
946                         schedule_work(&runtime->event_work);
947                 else if (snd_rawmidi_ready(substream))
948                         wake_up(&runtime->sleep);
949         }
950         spin_unlock_irqrestore(&runtime->lock, flags);
951         return result;
952 }
953 EXPORT_SYMBOL(snd_rawmidi_receive);
954 
955 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
956                                      unsigned char __user *userbuf,
957                                      unsigned char *kernelbuf, long count)
958 {
959         unsigned long flags;
960         long result = 0, count1;
961         struct snd_rawmidi_runtime *runtime = substream->runtime;
962         unsigned long appl_ptr;
963 
964         spin_lock_irqsave(&runtime->lock, flags);
965         while (count > 0 && runtime->avail) {
966                 count1 = runtime->buffer_size - runtime->appl_ptr;
967                 if (count1 > count)
968                         count1 = count;
969                 if (count1 > (int)runtime->avail)
970                         count1 = runtime->avail;
971 
972                 /* update runtime->appl_ptr before unlocking for userbuf */
973                 appl_ptr = runtime->appl_ptr;
974                 runtime->appl_ptr += count1;
975                 runtime->appl_ptr %= runtime->buffer_size;
976                 runtime->avail -= count1;
977 
978                 if (kernelbuf)
979                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
980                 if (userbuf) {
981                         spin_unlock_irqrestore(&runtime->lock, flags);
982                         if (copy_to_user(userbuf + result,
983                                          runtime->buffer + appl_ptr, count1)) {
984                                 return result > 0 ? result : -EFAULT;
985                         }
986                         spin_lock_irqsave(&runtime->lock, flags);
987                 }
988                 result += count1;
989                 count -= count1;
990         }
991         spin_unlock_irqrestore(&runtime->lock, flags);
992         return result;
993 }
994 
995 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
996                              unsigned char *buf, long count)
997 {
998         snd_rawmidi_input_trigger(substream, 1);
999         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1000 }
1001 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1002 
1003 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1004                                 loff_t *offset)
1005 {
1006         long result;
1007         int count1;
1008         struct snd_rawmidi_file *rfile;
1009         struct snd_rawmidi_substream *substream;
1010         struct snd_rawmidi_runtime *runtime;
1011 
1012         rfile = file->private_data;
1013         substream = rfile->input;
1014         if (substream == NULL)
1015                 return -EIO;
1016         runtime = substream->runtime;
1017         snd_rawmidi_input_trigger(substream, 1);
1018         result = 0;
1019         while (count > 0) {
1020                 spin_lock_irq(&runtime->lock);
1021                 while (!snd_rawmidi_ready(substream)) {
1022                         wait_queue_entry_t wait;
1023                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1024                                 spin_unlock_irq(&runtime->lock);
1025                                 return result > 0 ? result : -EAGAIN;
1026                         }
1027                         init_waitqueue_entry(&wait, current);
1028                         add_wait_queue(&runtime->sleep, &wait);
1029                         set_current_state(TASK_INTERRUPTIBLE);
1030                         spin_unlock_irq(&runtime->lock);
1031                         schedule();
1032                         remove_wait_queue(&runtime->sleep, &wait);
1033                         if (rfile->rmidi->card->shutdown)
1034                                 return -ENODEV;
1035                         if (signal_pending(current))
1036                                 return result > 0 ? result : -ERESTARTSYS;
1037                         if (!runtime->avail)
1038                                 return result > 0 ? result : -EIO;
1039                         spin_lock_irq(&runtime->lock);
1040                 }
1041                 spin_unlock_irq(&runtime->lock);
1042                 count1 = snd_rawmidi_kernel_read1(substream,
1043                                                   (unsigned char __user *)buf,
1044                                                   NULL/*kernelbuf*/,
1045                                                   count);
1046                 if (count1 < 0)
1047                         return result > 0 ? result : count1;
1048                 result += count1;
1049                 buf += count1;
1050                 count -= count1;
1051         }
1052         return result;
1053 }
1054 
1055 /**
1056  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1057  * @substream: the rawmidi substream
1058  *
1059  * Return: 1 if the internal output buffer is empty, 0 if not.
1060  */
1061 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1062 {
1063         struct snd_rawmidi_runtime *runtime = substream->runtime;
1064         int result;
1065         unsigned long flags;
1066 
1067         if (runtime->buffer == NULL) {
1068                 rmidi_dbg(substream->rmidi,
1069                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1070                 return 1;
1071         }
1072         spin_lock_irqsave(&runtime->lock, flags);
1073         result = runtime->avail >= runtime->buffer_size;
1074         spin_unlock_irqrestore(&runtime->lock, flags);
1075         return result;          
1076 }
1077 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1078 
1079 /**
1080  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1081  * @substream: the rawmidi substream
1082  * @buffer: the buffer pointer
1083  * @count: data size to transfer
1084  *
1085  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1086  */
1087 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1088                               unsigned char *buffer, int count)
1089 {
1090         int result, count1;
1091         struct snd_rawmidi_runtime *runtime = substream->runtime;
1092 
1093         if (runtime->buffer == NULL) {
1094                 rmidi_dbg(substream->rmidi,
1095                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1096                 return -EINVAL;
1097         }
1098         result = 0;
1099         if (runtime->avail >= runtime->buffer_size) {
1100                 /* warning: lowlevel layer MUST trigger down the hardware */
1101                 goto __skip;
1102         }
1103         if (count == 1) {       /* special case, faster code */
1104                 *buffer = runtime->buffer[runtime->hw_ptr];
1105                 result++;
1106         } else {
1107                 count1 = runtime->buffer_size - runtime->hw_ptr;
1108                 if (count1 > count)
1109                         count1 = count;
1110                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1111                         count1 = runtime->buffer_size - runtime->avail;
1112                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1113                 count -= count1;
1114                 result += count1;
1115                 if (count > 0) {
1116                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1117                                 count = runtime->buffer_size - runtime->avail - count1;
1118                         memcpy(buffer + count1, runtime->buffer, count);
1119                         result += count;
1120                 }
1121         }
1122       __skip:
1123         return result;
1124 }
1125 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1126 
1127 /**
1128  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1129  * @substream: the rawmidi substream
1130  * @buffer: the buffer pointer
1131  * @count: data size to transfer
1132  *
1133  * Copies data from the internal output buffer to the given buffer.
1134  *
1135  * Call this in the interrupt handler when the midi output is ready,
1136  * and call snd_rawmidi_transmit_ack() after the transmission is
1137  * finished.
1138  *
1139  * Return: The size of copied data, or a negative error code on failure.
1140  */
1141 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1142                               unsigned char *buffer, int count)
1143 {
1144         struct snd_rawmidi_runtime *runtime = substream->runtime;
1145         int result;
1146         unsigned long flags;
1147 
1148         spin_lock_irqsave(&runtime->lock, flags);
1149         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1150         spin_unlock_irqrestore(&runtime->lock, flags);
1151         return result;
1152 }
1153 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1154 
1155 /**
1156  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1157  * @substream: the rawmidi substream
1158  * @count: the transferred count
1159  *
1160  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1161  */
1162 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1163 {
1164         struct snd_rawmidi_runtime *runtime = substream->runtime;
1165 
1166         if (runtime->buffer == NULL) {
1167                 rmidi_dbg(substream->rmidi,
1168                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1169                 return -EINVAL;
1170         }
1171         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1172         runtime->hw_ptr += count;
1173         runtime->hw_ptr %= runtime->buffer_size;
1174         runtime->avail += count;
1175         substream->bytes += count;
1176         if (count > 0) {
1177                 if (runtime->drain || snd_rawmidi_ready(substream))
1178                         wake_up(&runtime->sleep);
1179         }
1180         return count;
1181 }
1182 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1183 
1184 /**
1185  * snd_rawmidi_transmit_ack - acknowledge the transmission
1186  * @substream: the rawmidi substream
1187  * @count: the transferred count
1188  *
1189  * Advances the hardware pointer for the internal output buffer with
1190  * the given size and updates the condition.
1191  * Call after the transmission is finished.
1192  *
1193  * Return: The advanced size if successful, or a negative error code on failure.
1194  */
1195 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1196 {
1197         struct snd_rawmidi_runtime *runtime = substream->runtime;
1198         int result;
1199         unsigned long flags;
1200 
1201         spin_lock_irqsave(&runtime->lock, flags);
1202         result = __snd_rawmidi_transmit_ack(substream, count);
1203         spin_unlock_irqrestore(&runtime->lock, flags);
1204         return result;
1205 }
1206 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1207 
1208 /**
1209  * snd_rawmidi_transmit - copy from the buffer to the device
1210  * @substream: the rawmidi substream
1211  * @buffer: the buffer pointer
1212  * @count: the data size to transfer
1213  * 
1214  * Copies data from the buffer to the device and advances the pointer.
1215  *
1216  * Return: The copied size if successful, or a negative error code on failure.
1217  */
1218 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1219                          unsigned char *buffer, int count)
1220 {
1221         struct snd_rawmidi_runtime *runtime = substream->runtime;
1222         int result;
1223         unsigned long flags;
1224 
1225         spin_lock_irqsave(&runtime->lock, flags);
1226         if (!substream->opened)
1227                 result = -EBADFD;
1228         else {
1229                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1230                 if (count <= 0)
1231                         result = count;
1232                 else
1233                         result = __snd_rawmidi_transmit_ack(substream, count);
1234         }
1235         spin_unlock_irqrestore(&runtime->lock, flags);
1236         return result;
1237 }
1238 EXPORT_SYMBOL(snd_rawmidi_transmit);
1239 
1240 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1241                                       const unsigned char __user *userbuf,
1242                                       const unsigned char *kernelbuf,
1243                                       long count)
1244 {
1245         unsigned long flags;
1246         long count1, result;
1247         struct snd_rawmidi_runtime *runtime = substream->runtime;
1248         unsigned long appl_ptr;
1249 
1250         if (!kernelbuf && !userbuf)
1251                 return -EINVAL;
1252         if (snd_BUG_ON(!runtime->buffer))
1253                 return -EINVAL;
1254 
1255         result = 0;
1256         spin_lock_irqsave(&runtime->lock, flags);
1257         if (substream->append) {
1258                 if ((long)runtime->avail < count) {
1259                         spin_unlock_irqrestore(&runtime->lock, flags);
1260                         return -EAGAIN;
1261                 }
1262         }
1263         while (count > 0 && runtime->avail > 0) {
1264                 count1 = runtime->buffer_size - runtime->appl_ptr;
1265                 if (count1 > count)
1266                         count1 = count;
1267                 if (count1 > (long)runtime->avail)
1268                         count1 = runtime->avail;
1269 
1270                 /* update runtime->appl_ptr before unlocking for userbuf */
1271                 appl_ptr = runtime->appl_ptr;
1272                 runtime->appl_ptr += count1;
1273                 runtime->appl_ptr %= runtime->buffer_size;
1274                 runtime->avail -= count1;
1275 
1276                 if (kernelbuf)
1277                         memcpy(runtime->buffer + appl_ptr,
1278                                kernelbuf + result, count1);
1279                 else if (userbuf) {
1280                         spin_unlock_irqrestore(&runtime->lock, flags);
1281                         if (copy_from_user(runtime->buffer + appl_ptr,
1282                                            userbuf + result, count1)) {
1283                                 spin_lock_irqsave(&runtime->lock, flags);
1284                                 result = result > 0 ? result : -EFAULT;
1285                                 goto __end;
1286                         }
1287                         spin_lock_irqsave(&runtime->lock, flags);
1288                 }
1289                 result += count1;
1290                 count -= count1;
1291         }
1292       __end:
1293         count1 = runtime->avail < runtime->buffer_size;
1294         spin_unlock_irqrestore(&runtime->lock, flags);
1295         if (count1)
1296                 snd_rawmidi_output_trigger(substream, 1);
1297         return result;
1298 }
1299 
1300 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1301                               const unsigned char *buf, long count)
1302 {
1303         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1304 }
1305 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1306 
1307 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1308                                  size_t count, loff_t *offset)
1309 {
1310         long result, timeout;
1311         int count1;
1312         struct snd_rawmidi_file *rfile;
1313         struct snd_rawmidi_runtime *runtime;
1314         struct snd_rawmidi_substream *substream;
1315 
1316         rfile = file->private_data;
1317         substream = rfile->output;
1318         runtime = substream->runtime;
1319         /* we cannot put an atomic message to our buffer */
1320         if (substream->append && count > runtime->buffer_size)
1321                 return -EIO;
1322         result = 0;
1323         while (count > 0) {
1324                 spin_lock_irq(&runtime->lock);
1325                 while (!snd_rawmidi_ready_append(substream, count)) {
1326                         wait_queue_entry_t wait;
1327                         if (file->f_flags & O_NONBLOCK) {
1328                                 spin_unlock_irq(&runtime->lock);
1329                                 return result > 0 ? result : -EAGAIN;
1330                         }
1331                         init_waitqueue_entry(&wait, current);
1332                         add_wait_queue(&runtime->sleep, &wait);
1333                         set_current_state(TASK_INTERRUPTIBLE);
1334                         spin_unlock_irq(&runtime->lock);
1335                         timeout = schedule_timeout(30 * HZ);
1336                         remove_wait_queue(&runtime->sleep, &wait);
1337                         if (rfile->rmidi->card->shutdown)
1338                                 return -ENODEV;
1339                         if (signal_pending(current))
1340                                 return result > 0 ? result : -ERESTARTSYS;
1341                         if (!runtime->avail && !timeout)
1342                                 return result > 0 ? result : -EIO;
1343                         spin_lock_irq(&runtime->lock);
1344                 }
1345                 spin_unlock_irq(&runtime->lock);
1346                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1347                 if (count1 < 0)
1348                         return result > 0 ? result : count1;
1349                 result += count1;
1350                 buf += count1;
1351                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1352                         break;
1353                 count -= count1;
1354         }
1355         if (file->f_flags & O_DSYNC) {
1356                 spin_lock_irq(&runtime->lock);
1357                 while (runtime->avail != runtime->buffer_size) {
1358                         wait_queue_entry_t wait;
1359                         unsigned int last_avail = runtime->avail;
1360                         init_waitqueue_entry(&wait, current);
1361                         add_wait_queue(&runtime->sleep, &wait);
1362                         set_current_state(TASK_INTERRUPTIBLE);
1363                         spin_unlock_irq(&runtime->lock);
1364                         timeout = schedule_timeout(30 * HZ);
1365                         remove_wait_queue(&runtime->sleep, &wait);
1366                         if (signal_pending(current))
1367                                 return result > 0 ? result : -ERESTARTSYS;
1368                         if (runtime->avail == last_avail && !timeout)
1369                                 return result > 0 ? result : -EIO;
1370                         spin_lock_irq(&runtime->lock);
1371                 }
1372                 spin_unlock_irq(&runtime->lock);
1373         }
1374         return result;
1375 }
1376 
1377 static __poll_t snd_rawmidi_poll(struct file *file, poll_table * wait)
1378 {
1379         struct snd_rawmidi_file *rfile;
1380         struct snd_rawmidi_runtime *runtime;
1381         __poll_t mask;
1382 
1383         rfile = file->private_data;
1384         if (rfile->input != NULL) {
1385                 runtime = rfile->input->runtime;
1386                 snd_rawmidi_input_trigger(rfile->input, 1);
1387                 poll_wait(file, &runtime->sleep, wait);
1388         }
1389         if (rfile->output != NULL) {
1390                 runtime = rfile->output->runtime;
1391                 poll_wait(file, &runtime->sleep, wait);
1392         }
1393         mask = 0;
1394         if (rfile->input != NULL) {
1395                 if (snd_rawmidi_ready(rfile->input))
1396                         mask |= EPOLLIN | EPOLLRDNORM;
1397         }
1398         if (rfile->output != NULL) {
1399                 if (snd_rawmidi_ready(rfile->output))
1400                         mask |= EPOLLOUT | EPOLLWRNORM;
1401         }
1402         return mask;
1403 }
1404 
1405 /*
1406  */
1407 #ifdef CONFIG_COMPAT
1408 #include "rawmidi_compat.c"
1409 #else
1410 #define snd_rawmidi_ioctl_compat        NULL
1411 #endif
1412 
1413 /*
1414 
1415  */
1416 
1417 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1418                                        struct snd_info_buffer *buffer)
1419 {
1420         struct snd_rawmidi *rmidi;
1421         struct snd_rawmidi_substream *substream;
1422         struct snd_rawmidi_runtime *runtime;
1423 
1424         rmidi = entry->private_data;
1425         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1426         mutex_lock(&rmidi->open_mutex);
1427         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1428                 list_for_each_entry(substream,
1429                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1430                                     list) {
1431                         snd_iprintf(buffer,
1432                                     "Output %d\n"
1433                                     "  Tx bytes     : %lu\n",
1434                                     substream->number,
1435                                     (unsigned long) substream->bytes);
1436                         if (substream->opened) {
1437                                 snd_iprintf(buffer,
1438                                     "  Owner PID    : %d\n",
1439                                     pid_vnr(substream->pid));
1440                                 runtime = substream->runtime;
1441                                 snd_iprintf(buffer,
1442                                     "  Mode         : %s\n"
1443                                     "  Buffer size  : %lu\n"
1444                                     "  Avail        : %lu\n",
1445                                     runtime->oss ? "OSS compatible" : "native",
1446                                     (unsigned long) runtime->buffer_size,
1447                                     (unsigned long) runtime->avail);
1448                         }
1449                 }
1450         }
1451         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1452                 list_for_each_entry(substream,
1453                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1454                                     list) {
1455                         snd_iprintf(buffer,
1456                                     "Input %d\n"
1457                                     "  Rx bytes     : %lu\n",
1458                                     substream->number,
1459                                     (unsigned long) substream->bytes);
1460                         if (substream->opened) {
1461                                 snd_iprintf(buffer,
1462                                             "  Owner PID    : %d\n",
1463                                             pid_vnr(substream->pid));
1464                                 runtime = substream->runtime;
1465                                 snd_iprintf(buffer,
1466                                             "  Buffer size  : %lu\n"
1467                                             "  Avail        : %lu\n"
1468                                             "  Overruns     : %lu\n",
1469                                             (unsigned long) runtime->buffer_size,
1470                                             (unsigned long) runtime->avail,
1471                                             (unsigned long) runtime->xruns);
1472                         }
1473                 }
1474         }
1475         mutex_unlock(&rmidi->open_mutex);
1476 }
1477 
1478 /*
1479  *  Register functions
1480  */
1481 
1482 static const struct file_operations snd_rawmidi_f_ops =
1483 {
1484         .owner =        THIS_MODULE,
1485         .read =         snd_rawmidi_read,
1486         .write =        snd_rawmidi_write,
1487         .open =         snd_rawmidi_open,
1488         .release =      snd_rawmidi_release,
1489         .llseek =       no_llseek,
1490         .poll =         snd_rawmidi_poll,
1491         .unlocked_ioctl =       snd_rawmidi_ioctl,
1492         .compat_ioctl = snd_rawmidi_ioctl_compat,
1493 };
1494 
1495 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1496                                         struct snd_rawmidi_str *stream,
1497                                         int direction,
1498                                         int count)
1499 {
1500         struct snd_rawmidi_substream *substream;
1501         int idx;
1502 
1503         for (idx = 0; idx < count; idx++) {
1504                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1505                 if (!substream)
1506                         return -ENOMEM;
1507                 substream->stream = direction;
1508                 substream->number = idx;
1509                 substream->rmidi = rmidi;
1510                 substream->pstr = stream;
1511                 list_add_tail(&substream->list, &stream->substreams);
1512                 stream->substream_count++;
1513         }
1514         return 0;
1515 }
1516 
1517 static void release_rawmidi_device(struct device *dev)
1518 {
1519         kfree(container_of(dev, struct snd_rawmidi, dev));
1520 }
1521 
1522 /**
1523  * snd_rawmidi_new - create a rawmidi instance
1524  * @card: the card instance
1525  * @id: the id string
1526  * @device: the device index
1527  * @output_count: the number of output streams
1528  * @input_count: the number of input streams
1529  * @rrawmidi: the pointer to store the new rawmidi instance
1530  *
1531  * Creates a new rawmidi instance.
1532  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1533  *
1534  * Return: Zero if successful, or a negative error code on failure.
1535  */
1536 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1537                     int output_count, int input_count,
1538                     struct snd_rawmidi ** rrawmidi)
1539 {
1540         struct snd_rawmidi *rmidi;
1541         int err;
1542         static struct snd_device_ops ops = {
1543                 .dev_free = snd_rawmidi_dev_free,
1544                 .dev_register = snd_rawmidi_dev_register,
1545                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1546         };
1547 
1548         if (snd_BUG_ON(!card))
1549                 return -ENXIO;
1550         if (rrawmidi)
1551                 *rrawmidi = NULL;
1552         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1553         if (!rmidi)
1554                 return -ENOMEM;
1555         rmidi->card = card;
1556         rmidi->device = device;
1557         mutex_init(&rmidi->open_mutex);
1558         init_waitqueue_head(&rmidi->open_wait);
1559         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1560         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1561 
1562         if (id != NULL)
1563                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1564 
1565         snd_device_initialize(&rmidi->dev, card);
1566         rmidi->dev.release = release_rawmidi_device;
1567         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1568 
1569         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1570                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1571                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1572                                                 input_count)) < 0) {
1573                 snd_rawmidi_free(rmidi);
1574                 return err;
1575         }
1576         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1577                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1578                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1579                                                 output_count)) < 0) {
1580                 snd_rawmidi_free(rmidi);
1581                 return err;
1582         }
1583         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1584                 snd_rawmidi_free(rmidi);
1585                 return err;
1586         }
1587         if (rrawmidi)
1588                 *rrawmidi = rmidi;
1589         return 0;
1590 }
1591 EXPORT_SYMBOL(snd_rawmidi_new);
1592 
1593 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1594 {
1595         struct snd_rawmidi_substream *substream;
1596 
1597         while (!list_empty(&stream->substreams)) {
1598                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1599                 list_del(&substream->list);
1600                 kfree(substream);
1601         }
1602 }
1603 
1604 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1605 {
1606         if (!rmidi)
1607                 return 0;
1608 
1609         snd_info_free_entry(rmidi->proc_entry);
1610         rmidi->proc_entry = NULL;
1611         mutex_lock(&register_mutex);
1612         if (rmidi->ops && rmidi->ops->dev_unregister)
1613                 rmidi->ops->dev_unregister(rmidi);
1614         mutex_unlock(&register_mutex);
1615 
1616         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1617         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1618         if (rmidi->private_free)
1619                 rmidi->private_free(rmidi);
1620         put_device(&rmidi->dev);
1621         return 0;
1622 }
1623 
1624 static int snd_rawmidi_dev_free(struct snd_device *device)
1625 {
1626         struct snd_rawmidi *rmidi = device->device_data;
1627         return snd_rawmidi_free(rmidi);
1628 }
1629 
1630 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1631 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1632 {
1633         struct snd_rawmidi *rmidi = device->private_data;
1634         rmidi->seq_dev = NULL;
1635 }
1636 #endif
1637 
1638 static int snd_rawmidi_dev_register(struct snd_device *device)
1639 {
1640         int err;
1641         struct snd_info_entry *entry;
1642         char name[16];
1643         struct snd_rawmidi *rmidi = device->device_data;
1644 
1645         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1646                 return -ENOMEM;
1647         mutex_lock(&register_mutex);
1648         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1649                 mutex_unlock(&register_mutex);
1650                 return -EBUSY;
1651         }
1652         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1653         mutex_unlock(&register_mutex);
1654         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1655                                   rmidi->card, rmidi->device,
1656                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1657         if (err < 0) {
1658                 rmidi_err(rmidi, "unable to register\n");
1659                 mutex_lock(&register_mutex);
1660                 list_del(&rmidi->list);
1661                 mutex_unlock(&register_mutex);
1662                 return err;
1663         }
1664         if (rmidi->ops && rmidi->ops->dev_register &&
1665             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1666                 snd_unregister_device(&rmidi->dev);
1667                 mutex_lock(&register_mutex);
1668                 list_del(&rmidi->list);
1669                 mutex_unlock(&register_mutex);
1670                 return err;
1671         }
1672 #ifdef CONFIG_SND_OSSEMUL
1673         rmidi->ossreg = 0;
1674         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1675                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1676                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1677                                             rmidi) < 0) {
1678                         rmidi_err(rmidi,
1679                                   "unable to register OSS rawmidi device %i:%i\n",
1680                                   rmidi->card->number, 0);
1681                 } else {
1682                         rmidi->ossreg++;
1683 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1684                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1685 #endif
1686                 }
1687         }
1688         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1689                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1690                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1691                                             rmidi) < 0) {
1692                         rmidi_err(rmidi,
1693                                   "unable to register OSS rawmidi device %i:%i\n",
1694                                   rmidi->card->number, 1);
1695                 } else {
1696                         rmidi->ossreg++;
1697                 }
1698         }
1699 #endif /* CONFIG_SND_OSSEMUL */
1700         sprintf(name, "midi%d", rmidi->device);
1701         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1702         if (entry) {
1703                 entry->private_data = rmidi;
1704                 entry->c.text.read = snd_rawmidi_proc_info_read;
1705                 if (snd_info_register(entry) < 0) {
1706                         snd_info_free_entry(entry);
1707                         entry = NULL;
1708                 }
1709         }
1710         rmidi->proc_entry = entry;
1711 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1712         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1713                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1714                         rmidi->seq_dev->private_data = rmidi;
1715                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1716                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1717                         snd_device_register(rmidi->card, rmidi->seq_dev);
1718                 }
1719         }
1720 #endif
1721         return 0;
1722 }
1723 
1724 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1725 {
1726         struct snd_rawmidi *rmidi = device->device_data;
1727         int dir;
1728 
1729         mutex_lock(&register_mutex);
1730         mutex_lock(&rmidi->open_mutex);
1731         wake_up(&rmidi->open_wait);
1732         list_del_init(&rmidi->list);
1733         for (dir = 0; dir < 2; dir++) {
1734                 struct snd_rawmidi_substream *s;
1735                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1736                         if (s->runtime)
1737                                 wake_up(&s->runtime->sleep);
1738                 }
1739         }
1740 
1741 #ifdef CONFIG_SND_OSSEMUL
1742         if (rmidi->ossreg) {
1743                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1744                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1745 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1746                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1747 #endif
1748                 }
1749                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1750                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1751                 rmidi->ossreg = 0;
1752         }
1753 #endif /* CONFIG_SND_OSSEMUL */
1754         snd_unregister_device(&rmidi->dev);
1755         mutex_unlock(&rmidi->open_mutex);
1756         mutex_unlock(&register_mutex);
1757         return 0;
1758 }
1759 
1760 /**
1761  * snd_rawmidi_set_ops - set the rawmidi operators
1762  * @rmidi: the rawmidi instance
1763  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1764  * @ops: the operator table
1765  *
1766  * Sets the rawmidi operators for the given stream direction.
1767  */
1768 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1769                          const struct snd_rawmidi_ops *ops)
1770 {
1771         struct snd_rawmidi_substream *substream;
1772         
1773         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1774                 substream->ops = ops;
1775 }
1776 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1777 
1778 /*
1779  *  ENTRY functions
1780  */
1781 
1782 static int __init alsa_rawmidi_init(void)
1783 {
1784 
1785         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1786         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1787 #ifdef CONFIG_SND_OSSEMUL
1788         { int i;
1789         /* check device map table */
1790         for (i = 0; i < SNDRV_CARDS; i++) {
1791                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1792                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1793                                i, midi_map[i]);
1794                         midi_map[i] = 0;
1795                 }
1796                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1797                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1798                                i, amidi_map[i]);
1799                         amidi_map[i] = 1;
1800                 }
1801         }
1802         }
1803 #endif /* CONFIG_SND_OSSEMUL */
1804         return 0;
1805 }
1806 
1807 static void __exit alsa_rawmidi_exit(void)
1808 {
1809         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1810         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1811 }
1812 
1813 module_init(alsa_rawmidi_init)
1814 module_exit(alsa_rawmidi_exit)
1815 

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