Merge tag 'sound-4.15-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
[muen/linux.git] / sound / core / rawmidi.c
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;
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 = krealloc(runtime->buffer, params->buffer_size,
652                                   GFP_KERNEL);
653                 if (!newbuf)
654                         return -ENOMEM;
655                 runtime->buffer = newbuf;
656                 runtime->buffer_size = params->buffer_size;
657                 runtime->avail = runtime->buffer_size;
658         }
659         runtime->avail_min = params->avail_min;
660         substream->active_sensing = !params->no_active_sensing;
661         return 0;
662 }
663 EXPORT_SYMBOL(snd_rawmidi_output_params);
664
665 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
666                              struct snd_rawmidi_params * params)
667 {
668         char *newbuf;
669         struct snd_rawmidi_runtime *runtime = substream->runtime;
670
671         snd_rawmidi_drain_input(substream);
672         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
673                 return -EINVAL;
674         }
675         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
676                 return -EINVAL;
677         }
678         if (params->buffer_size != runtime->buffer_size) {
679                 newbuf = krealloc(runtime->buffer, params->buffer_size,
680                                   GFP_KERNEL);
681                 if (!newbuf)
682                         return -ENOMEM;
683                 runtime->buffer = newbuf;
684                 runtime->buffer_size = params->buffer_size;
685         }
686         runtime->avail_min = params->avail_min;
687         return 0;
688 }
689 EXPORT_SYMBOL(snd_rawmidi_input_params);
690
691 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
692                                      struct snd_rawmidi_status * status)
693 {
694         struct snd_rawmidi_runtime *runtime = substream->runtime;
695
696         memset(status, 0, sizeof(*status));
697         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
698         spin_lock_irq(&runtime->lock);
699         status->avail = runtime->avail;
700         spin_unlock_irq(&runtime->lock);
701         return 0;
702 }
703
704 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
705                                     struct snd_rawmidi_status * status)
706 {
707         struct snd_rawmidi_runtime *runtime = substream->runtime;
708
709         memset(status, 0, sizeof(*status));
710         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
711         spin_lock_irq(&runtime->lock);
712         status->avail = runtime->avail;
713         status->xruns = runtime->xruns;
714         runtime->xruns = 0;
715         spin_unlock_irq(&runtime->lock);
716         return 0;
717 }
718
719 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
720 {
721         struct snd_rawmidi_file *rfile;
722         void __user *argp = (void __user *)arg;
723
724         rfile = file->private_data;
725         if (((cmd >> 8) & 0xff) != 'W')
726                 return -ENOTTY;
727         switch (cmd) {
728         case SNDRV_RAWMIDI_IOCTL_PVERSION:
729                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
730         case SNDRV_RAWMIDI_IOCTL_INFO:
731         {
732                 int stream;
733                 struct snd_rawmidi_info __user *info = argp;
734                 if (get_user(stream, &info->stream))
735                         return -EFAULT;
736                 switch (stream) {
737                 case SNDRV_RAWMIDI_STREAM_INPUT:
738                         return snd_rawmidi_info_user(rfile->input, info);
739                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
740                         return snd_rawmidi_info_user(rfile->output, info);
741                 default:
742                         return -EINVAL;
743                 }
744         }
745         case SNDRV_RAWMIDI_IOCTL_PARAMS:
746         {
747                 struct snd_rawmidi_params params;
748                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
749                         return -EFAULT;
750                 switch (params.stream) {
751                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
752                         if (rfile->output == NULL)
753                                 return -EINVAL;
754                         return snd_rawmidi_output_params(rfile->output, &params);
755                 case SNDRV_RAWMIDI_STREAM_INPUT:
756                         if (rfile->input == NULL)
757                                 return -EINVAL;
758                         return snd_rawmidi_input_params(rfile->input, &params);
759                 default:
760                         return -EINVAL;
761                 }
762         }
763         case SNDRV_RAWMIDI_IOCTL_STATUS:
764         {
765                 int err = 0;
766                 struct snd_rawmidi_status status;
767                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
768                         return -EFAULT;
769                 switch (status.stream) {
770                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
771                         if (rfile->output == NULL)
772                                 return -EINVAL;
773                         err = snd_rawmidi_output_status(rfile->output, &status);
774                         break;
775                 case SNDRV_RAWMIDI_STREAM_INPUT:
776                         if (rfile->input == NULL)
777                                 return -EINVAL;
778                         err = snd_rawmidi_input_status(rfile->input, &status);
779                         break;
780                 default:
781                         return -EINVAL;
782                 }
783                 if (err < 0)
784                         return err;
785                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
786                         return -EFAULT;
787                 return 0;
788         }
789         case SNDRV_RAWMIDI_IOCTL_DROP:
790         {
791                 int val;
792                 if (get_user(val, (int __user *) argp))
793                         return -EFAULT;
794                 switch (val) {
795                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
796                         if (rfile->output == NULL)
797                                 return -EINVAL;
798                         return snd_rawmidi_drop_output(rfile->output);
799                 default:
800                         return -EINVAL;
801                 }
802         }
803         case SNDRV_RAWMIDI_IOCTL_DRAIN:
804         {
805                 int val;
806                 if (get_user(val, (int __user *) argp))
807                         return -EFAULT;
808                 switch (val) {
809                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
810                         if (rfile->output == NULL)
811                                 return -EINVAL;
812                         return snd_rawmidi_drain_output(rfile->output);
813                 case SNDRV_RAWMIDI_STREAM_INPUT:
814                         if (rfile->input == NULL)
815                                 return -EINVAL;
816                         return snd_rawmidi_drain_input(rfile->input);
817                 default:
818                         return -EINVAL;
819                 }
820         }
821         default:
822                 rmidi_dbg(rfile->rmidi,
823                           "rawmidi: unknown command = 0x%x\n", cmd);
824         }
825         return -ENOTTY;
826 }
827
828 static int snd_rawmidi_control_ioctl(struct snd_card *card,
829                                      struct snd_ctl_file *control,
830                                      unsigned int cmd,
831                                      unsigned long arg)
832 {
833         void __user *argp = (void __user *)arg;
834
835         switch (cmd) {
836         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
837         {
838                 int device;
839                 
840                 if (get_user(device, (int __user *)argp))
841                         return -EFAULT;
842                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
843                         device = SNDRV_RAWMIDI_DEVICES - 1;
844                 mutex_lock(&register_mutex);
845                 device = device < 0 ? 0 : device + 1;
846                 while (device < SNDRV_RAWMIDI_DEVICES) {
847                         if (snd_rawmidi_search(card, device))
848                                 break;
849                         device++;
850                 }
851                 if (device == SNDRV_RAWMIDI_DEVICES)
852                         device = -1;
853                 mutex_unlock(&register_mutex);
854                 if (put_user(device, (int __user *)argp))
855                         return -EFAULT;
856                 return 0;
857         }
858         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
859         {
860                 int val;
861                 
862                 if (get_user(val, (int __user *)argp))
863                         return -EFAULT;
864                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
865                 return 0;
866         }
867         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
868                 return snd_rawmidi_info_select_user(card, argp);
869         }
870         return -ENOIOCTLCMD;
871 }
872
873 /**
874  * snd_rawmidi_receive - receive the input data from the device
875  * @substream: the rawmidi substream
876  * @buffer: the buffer pointer
877  * @count: the data size to read
878  *
879  * Reads the data from the internal buffer.
880  *
881  * Return: The size of read data, or a negative error code on failure.
882  */
883 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
884                         const unsigned char *buffer, int count)
885 {
886         unsigned long flags;
887         int result = 0, count1;
888         struct snd_rawmidi_runtime *runtime = substream->runtime;
889
890         if (!substream->opened)
891                 return -EBADFD;
892         if (runtime->buffer == NULL) {
893                 rmidi_dbg(substream->rmidi,
894                           "snd_rawmidi_receive: input is not active!!!\n");
895                 return -EINVAL;
896         }
897         spin_lock_irqsave(&runtime->lock, flags);
898         if (count == 1) {       /* special case, faster code */
899                 substream->bytes++;
900                 if (runtime->avail < runtime->buffer_size) {
901                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
902                         runtime->hw_ptr %= runtime->buffer_size;
903                         runtime->avail++;
904                         result++;
905                 } else {
906                         runtime->xruns++;
907                 }
908         } else {
909                 substream->bytes += count;
910                 count1 = runtime->buffer_size - runtime->hw_ptr;
911                 if (count1 > count)
912                         count1 = count;
913                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
914                         count1 = runtime->buffer_size - runtime->avail;
915                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
916                 runtime->hw_ptr += count1;
917                 runtime->hw_ptr %= runtime->buffer_size;
918                 runtime->avail += count1;
919                 count -= count1;
920                 result += count1;
921                 if (count > 0) {
922                         buffer += count1;
923                         count1 = count;
924                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
925                                 count1 = runtime->buffer_size - runtime->avail;
926                                 runtime->xruns += count - count1;
927                         }
928                         if (count1 > 0) {
929                                 memcpy(runtime->buffer, buffer, count1);
930                                 runtime->hw_ptr = count1;
931                                 runtime->avail += count1;
932                                 result += count1;
933                         }
934                 }
935         }
936         if (result > 0) {
937                 if (runtime->event)
938                         schedule_work(&runtime->event_work);
939                 else if (snd_rawmidi_ready(substream))
940                         wake_up(&runtime->sleep);
941         }
942         spin_unlock_irqrestore(&runtime->lock, flags);
943         return result;
944 }
945 EXPORT_SYMBOL(snd_rawmidi_receive);
946
947 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
948                                      unsigned char __user *userbuf,
949                                      unsigned char *kernelbuf, long count)
950 {
951         unsigned long flags;
952         long result = 0, count1;
953         struct snd_rawmidi_runtime *runtime = substream->runtime;
954         unsigned long appl_ptr;
955
956         spin_lock_irqsave(&runtime->lock, flags);
957         while (count > 0 && runtime->avail) {
958                 count1 = runtime->buffer_size - runtime->appl_ptr;
959                 if (count1 > count)
960                         count1 = count;
961                 if (count1 > (int)runtime->avail)
962                         count1 = runtime->avail;
963
964                 /* update runtime->appl_ptr before unlocking for userbuf */
965                 appl_ptr = runtime->appl_ptr;
966                 runtime->appl_ptr += count1;
967                 runtime->appl_ptr %= runtime->buffer_size;
968                 runtime->avail -= count1;
969
970                 if (kernelbuf)
971                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
972                 if (userbuf) {
973                         spin_unlock_irqrestore(&runtime->lock, flags);
974                         if (copy_to_user(userbuf + result,
975                                          runtime->buffer + appl_ptr, count1)) {
976                                 return result > 0 ? result : -EFAULT;
977                         }
978                         spin_lock_irqsave(&runtime->lock, flags);
979                 }
980                 result += count1;
981                 count -= count1;
982         }
983         spin_unlock_irqrestore(&runtime->lock, flags);
984         return result;
985 }
986
987 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
988                              unsigned char *buf, long count)
989 {
990         snd_rawmidi_input_trigger(substream, 1);
991         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
992 }
993 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
994
995 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
996                                 loff_t *offset)
997 {
998         long result;
999         int count1;
1000         struct snd_rawmidi_file *rfile;
1001         struct snd_rawmidi_substream *substream;
1002         struct snd_rawmidi_runtime *runtime;
1003
1004         rfile = file->private_data;
1005         substream = rfile->input;
1006         if (substream == NULL)
1007                 return -EIO;
1008         runtime = substream->runtime;
1009         snd_rawmidi_input_trigger(substream, 1);
1010         result = 0;
1011         while (count > 0) {
1012                 spin_lock_irq(&runtime->lock);
1013                 while (!snd_rawmidi_ready(substream)) {
1014                         wait_queue_entry_t wait;
1015                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1016                                 spin_unlock_irq(&runtime->lock);
1017                                 return result > 0 ? result : -EAGAIN;
1018                         }
1019                         init_waitqueue_entry(&wait, current);
1020                         add_wait_queue(&runtime->sleep, &wait);
1021                         set_current_state(TASK_INTERRUPTIBLE);
1022                         spin_unlock_irq(&runtime->lock);
1023                         schedule();
1024                         remove_wait_queue(&runtime->sleep, &wait);
1025                         if (rfile->rmidi->card->shutdown)
1026                                 return -ENODEV;
1027                         if (signal_pending(current))
1028                                 return result > 0 ? result : -ERESTARTSYS;
1029                         if (!runtime->avail)
1030                                 return result > 0 ? result : -EIO;
1031                         spin_lock_irq(&runtime->lock);
1032                 }
1033                 spin_unlock_irq(&runtime->lock);
1034                 count1 = snd_rawmidi_kernel_read1(substream,
1035                                                   (unsigned char __user *)buf,
1036                                                   NULL/*kernelbuf*/,
1037                                                   count);
1038                 if (count1 < 0)
1039                         return result > 0 ? result : count1;
1040                 result += count1;
1041                 buf += count1;
1042                 count -= count1;
1043         }
1044         return result;
1045 }
1046
1047 /**
1048  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1049  * @substream: the rawmidi substream
1050  *
1051  * Return: 1 if the internal output buffer is empty, 0 if not.
1052  */
1053 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1054 {
1055         struct snd_rawmidi_runtime *runtime = substream->runtime;
1056         int result;
1057         unsigned long flags;
1058
1059         if (runtime->buffer == NULL) {
1060                 rmidi_dbg(substream->rmidi,
1061                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1062                 return 1;
1063         }
1064         spin_lock_irqsave(&runtime->lock, flags);
1065         result = runtime->avail >= runtime->buffer_size;
1066         spin_unlock_irqrestore(&runtime->lock, flags);
1067         return result;          
1068 }
1069 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1070
1071 /**
1072  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1073  * @substream: the rawmidi substream
1074  * @buffer: the buffer pointer
1075  * @count: data size to transfer
1076  *
1077  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1078  */
1079 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1080                               unsigned char *buffer, int count)
1081 {
1082         int result, count1;
1083         struct snd_rawmidi_runtime *runtime = substream->runtime;
1084
1085         if (runtime->buffer == NULL) {
1086                 rmidi_dbg(substream->rmidi,
1087                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1088                 return -EINVAL;
1089         }
1090         result = 0;
1091         if (runtime->avail >= runtime->buffer_size) {
1092                 /* warning: lowlevel layer MUST trigger down the hardware */
1093                 goto __skip;
1094         }
1095         if (count == 1) {       /* special case, faster code */
1096                 *buffer = runtime->buffer[runtime->hw_ptr];
1097                 result++;
1098         } else {
1099                 count1 = runtime->buffer_size - runtime->hw_ptr;
1100                 if (count1 > count)
1101                         count1 = count;
1102                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1103                         count1 = runtime->buffer_size - runtime->avail;
1104                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1105                 count -= count1;
1106                 result += count1;
1107                 if (count > 0) {
1108                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1109                                 count = runtime->buffer_size - runtime->avail - count1;
1110                         memcpy(buffer + count1, runtime->buffer, count);
1111                         result += count;
1112                 }
1113         }
1114       __skip:
1115         return result;
1116 }
1117 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1118
1119 /**
1120  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1121  * @substream: the rawmidi substream
1122  * @buffer: the buffer pointer
1123  * @count: data size to transfer
1124  *
1125  * Copies data from the internal output buffer to the given buffer.
1126  *
1127  * Call this in the interrupt handler when the midi output is ready,
1128  * and call snd_rawmidi_transmit_ack() after the transmission is
1129  * finished.
1130  *
1131  * Return: The size of copied data, or a negative error code on failure.
1132  */
1133 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1134                               unsigned char *buffer, int count)
1135 {
1136         struct snd_rawmidi_runtime *runtime = substream->runtime;
1137         int result;
1138         unsigned long flags;
1139
1140         spin_lock_irqsave(&runtime->lock, flags);
1141         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1142         spin_unlock_irqrestore(&runtime->lock, flags);
1143         return result;
1144 }
1145 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1146
1147 /**
1148  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1149  * @substream: the rawmidi substream
1150  * @count: the transferred count
1151  *
1152  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1153  */
1154 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1155 {
1156         struct snd_rawmidi_runtime *runtime = substream->runtime;
1157
1158         if (runtime->buffer == NULL) {
1159                 rmidi_dbg(substream->rmidi,
1160                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1161                 return -EINVAL;
1162         }
1163         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1164         runtime->hw_ptr += count;
1165         runtime->hw_ptr %= runtime->buffer_size;
1166         runtime->avail += count;
1167         substream->bytes += count;
1168         if (count > 0) {
1169                 if (runtime->drain || snd_rawmidi_ready(substream))
1170                         wake_up(&runtime->sleep);
1171         }
1172         return count;
1173 }
1174 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1175
1176 /**
1177  * snd_rawmidi_transmit_ack - acknowledge the transmission
1178  * @substream: the rawmidi substream
1179  * @count: the transferred count
1180  *
1181  * Advances the hardware pointer for the internal output buffer with
1182  * the given size and updates the condition.
1183  * Call after the transmission is finished.
1184  *
1185  * Return: The advanced size if successful, or a negative error code on failure.
1186  */
1187 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1188 {
1189         struct snd_rawmidi_runtime *runtime = substream->runtime;
1190         int result;
1191         unsigned long flags;
1192
1193         spin_lock_irqsave(&runtime->lock, flags);
1194         result = __snd_rawmidi_transmit_ack(substream, count);
1195         spin_unlock_irqrestore(&runtime->lock, flags);
1196         return result;
1197 }
1198 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1199
1200 /**
1201  * snd_rawmidi_transmit - copy from the buffer to the device
1202  * @substream: the rawmidi substream
1203  * @buffer: the buffer pointer
1204  * @count: the data size to transfer
1205  * 
1206  * Copies data from the buffer to the device and advances the pointer.
1207  *
1208  * Return: The copied size if successful, or a negative error code on failure.
1209  */
1210 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1211                          unsigned char *buffer, int count)
1212 {
1213         struct snd_rawmidi_runtime *runtime = substream->runtime;
1214         int result;
1215         unsigned long flags;
1216
1217         spin_lock_irqsave(&runtime->lock, flags);
1218         if (!substream->opened)
1219                 result = -EBADFD;
1220         else {
1221                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1222                 if (count <= 0)
1223                         result = count;
1224                 else
1225                         result = __snd_rawmidi_transmit_ack(substream, count);
1226         }
1227         spin_unlock_irqrestore(&runtime->lock, flags);
1228         return result;
1229 }
1230 EXPORT_SYMBOL(snd_rawmidi_transmit);
1231
1232 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1233                                       const unsigned char __user *userbuf,
1234                                       const unsigned char *kernelbuf,
1235                                       long count)
1236 {
1237         unsigned long flags;
1238         long count1, result;
1239         struct snd_rawmidi_runtime *runtime = substream->runtime;
1240         unsigned long appl_ptr;
1241
1242         if (!kernelbuf && !userbuf)
1243                 return -EINVAL;
1244         if (snd_BUG_ON(!runtime->buffer))
1245                 return -EINVAL;
1246
1247         result = 0;
1248         spin_lock_irqsave(&runtime->lock, flags);
1249         if (substream->append) {
1250                 if ((long)runtime->avail < count) {
1251                         spin_unlock_irqrestore(&runtime->lock, flags);
1252                         return -EAGAIN;
1253                 }
1254         }
1255         while (count > 0 && runtime->avail > 0) {
1256                 count1 = runtime->buffer_size - runtime->appl_ptr;
1257                 if (count1 > count)
1258                         count1 = count;
1259                 if (count1 > (long)runtime->avail)
1260                         count1 = runtime->avail;
1261
1262                 /* update runtime->appl_ptr before unlocking for userbuf */
1263                 appl_ptr = runtime->appl_ptr;
1264                 runtime->appl_ptr += count1;
1265                 runtime->appl_ptr %= runtime->buffer_size;
1266                 runtime->avail -= count1;
1267
1268                 if (kernelbuf)
1269                         memcpy(runtime->buffer + appl_ptr,
1270                                kernelbuf + result, count1);
1271                 else if (userbuf) {
1272                         spin_unlock_irqrestore(&runtime->lock, flags);
1273                         if (copy_from_user(runtime->buffer + appl_ptr,
1274                                            userbuf + result, count1)) {
1275                                 spin_lock_irqsave(&runtime->lock, flags);
1276                                 result = result > 0 ? result : -EFAULT;
1277                                 goto __end;
1278                         }
1279                         spin_lock_irqsave(&runtime->lock, flags);
1280                 }
1281                 result += count1;
1282                 count -= count1;
1283         }
1284       __end:
1285         count1 = runtime->avail < runtime->buffer_size;
1286         spin_unlock_irqrestore(&runtime->lock, flags);
1287         if (count1)
1288                 snd_rawmidi_output_trigger(substream, 1);
1289         return result;
1290 }
1291
1292 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1293                               const unsigned char *buf, long count)
1294 {
1295         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1296 }
1297 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1298
1299 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1300                                  size_t count, loff_t *offset)
1301 {
1302         long result, timeout;
1303         int count1;
1304         struct snd_rawmidi_file *rfile;
1305         struct snd_rawmidi_runtime *runtime;
1306         struct snd_rawmidi_substream *substream;
1307
1308         rfile = file->private_data;
1309         substream = rfile->output;
1310         runtime = substream->runtime;
1311         /* we cannot put an atomic message to our buffer */
1312         if (substream->append && count > runtime->buffer_size)
1313                 return -EIO;
1314         result = 0;
1315         while (count > 0) {
1316                 spin_lock_irq(&runtime->lock);
1317                 while (!snd_rawmidi_ready_append(substream, count)) {
1318                         wait_queue_entry_t wait;
1319                         if (file->f_flags & O_NONBLOCK) {
1320                                 spin_unlock_irq(&runtime->lock);
1321                                 return result > 0 ? result : -EAGAIN;
1322                         }
1323                         init_waitqueue_entry(&wait, current);
1324                         add_wait_queue(&runtime->sleep, &wait);
1325                         set_current_state(TASK_INTERRUPTIBLE);
1326                         spin_unlock_irq(&runtime->lock);
1327                         timeout = schedule_timeout(30 * HZ);
1328                         remove_wait_queue(&runtime->sleep, &wait);
1329                         if (rfile->rmidi->card->shutdown)
1330                                 return -ENODEV;
1331                         if (signal_pending(current))
1332                                 return result > 0 ? result : -ERESTARTSYS;
1333                         if (!runtime->avail && !timeout)
1334                                 return result > 0 ? result : -EIO;
1335                         spin_lock_irq(&runtime->lock);
1336                 }
1337                 spin_unlock_irq(&runtime->lock);
1338                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1339                 if (count1 < 0)
1340                         return result > 0 ? result : count1;
1341                 result += count1;
1342                 buf += count1;
1343                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1344                         break;
1345                 count -= count1;
1346         }
1347         if (file->f_flags & O_DSYNC) {
1348                 spin_lock_irq(&runtime->lock);
1349                 while (runtime->avail != runtime->buffer_size) {
1350                         wait_queue_entry_t wait;
1351                         unsigned int last_avail = runtime->avail;
1352                         init_waitqueue_entry(&wait, current);
1353                         add_wait_queue(&runtime->sleep, &wait);
1354                         set_current_state(TASK_INTERRUPTIBLE);
1355                         spin_unlock_irq(&runtime->lock);
1356                         timeout = schedule_timeout(30 * HZ);
1357                         remove_wait_queue(&runtime->sleep, &wait);
1358                         if (signal_pending(current))
1359                                 return result > 0 ? result : -ERESTARTSYS;
1360                         if (runtime->avail == last_avail && !timeout)
1361                                 return result > 0 ? result : -EIO;
1362                         spin_lock_irq(&runtime->lock);
1363                 }
1364                 spin_unlock_irq(&runtime->lock);
1365         }
1366         return result;
1367 }
1368
1369 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1370 {
1371         struct snd_rawmidi_file *rfile;
1372         struct snd_rawmidi_runtime *runtime;
1373         unsigned int mask;
1374
1375         rfile = file->private_data;
1376         if (rfile->input != NULL) {
1377                 runtime = rfile->input->runtime;
1378                 snd_rawmidi_input_trigger(rfile->input, 1);
1379                 poll_wait(file, &runtime->sleep, wait);
1380         }
1381         if (rfile->output != NULL) {
1382                 runtime = rfile->output->runtime;
1383                 poll_wait(file, &runtime->sleep, wait);
1384         }
1385         mask = 0;
1386         if (rfile->input != NULL) {
1387                 if (snd_rawmidi_ready(rfile->input))
1388                         mask |= POLLIN | POLLRDNORM;
1389         }
1390         if (rfile->output != NULL) {
1391                 if (snd_rawmidi_ready(rfile->output))
1392                         mask |= POLLOUT | POLLWRNORM;
1393         }
1394         return mask;
1395 }
1396
1397 /*
1398  */
1399 #ifdef CONFIG_COMPAT
1400 #include "rawmidi_compat.c"
1401 #else
1402 #define snd_rawmidi_ioctl_compat        NULL
1403 #endif
1404
1405 /*
1406
1407  */
1408
1409 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1410                                        struct snd_info_buffer *buffer)
1411 {
1412         struct snd_rawmidi *rmidi;
1413         struct snd_rawmidi_substream *substream;
1414         struct snd_rawmidi_runtime *runtime;
1415
1416         rmidi = entry->private_data;
1417         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1418         mutex_lock(&rmidi->open_mutex);
1419         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1420                 list_for_each_entry(substream,
1421                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1422                                     list) {
1423                         snd_iprintf(buffer,
1424                                     "Output %d\n"
1425                                     "  Tx bytes     : %lu\n",
1426                                     substream->number,
1427                                     (unsigned long) substream->bytes);
1428                         if (substream->opened) {
1429                                 snd_iprintf(buffer,
1430                                     "  Owner PID    : %d\n",
1431                                     pid_vnr(substream->pid));
1432                                 runtime = substream->runtime;
1433                                 snd_iprintf(buffer,
1434                                     "  Mode         : %s\n"
1435                                     "  Buffer size  : %lu\n"
1436                                     "  Avail        : %lu\n",
1437                                     runtime->oss ? "OSS compatible" : "native",
1438                                     (unsigned long) runtime->buffer_size,
1439                                     (unsigned long) runtime->avail);
1440                         }
1441                 }
1442         }
1443         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1444                 list_for_each_entry(substream,
1445                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1446                                     list) {
1447                         snd_iprintf(buffer,
1448                                     "Input %d\n"
1449                                     "  Rx bytes     : %lu\n",
1450                                     substream->number,
1451                                     (unsigned long) substream->bytes);
1452                         if (substream->opened) {
1453                                 snd_iprintf(buffer,
1454                                             "  Owner PID    : %d\n",
1455                                             pid_vnr(substream->pid));
1456                                 runtime = substream->runtime;
1457                                 snd_iprintf(buffer,
1458                                             "  Buffer size  : %lu\n"
1459                                             "  Avail        : %lu\n"
1460                                             "  Overruns     : %lu\n",
1461                                             (unsigned long) runtime->buffer_size,
1462                                             (unsigned long) runtime->avail,
1463                                             (unsigned long) runtime->xruns);
1464                         }
1465                 }
1466         }
1467         mutex_unlock(&rmidi->open_mutex);
1468 }
1469
1470 /*
1471  *  Register functions
1472  */
1473
1474 static const struct file_operations snd_rawmidi_f_ops =
1475 {
1476         .owner =        THIS_MODULE,
1477         .read =         snd_rawmidi_read,
1478         .write =        snd_rawmidi_write,
1479         .open =         snd_rawmidi_open,
1480         .release =      snd_rawmidi_release,
1481         .llseek =       no_llseek,
1482         .poll =         snd_rawmidi_poll,
1483         .unlocked_ioctl =       snd_rawmidi_ioctl,
1484         .compat_ioctl = snd_rawmidi_ioctl_compat,
1485 };
1486
1487 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1488                                         struct snd_rawmidi_str *stream,
1489                                         int direction,
1490                                         int count)
1491 {
1492         struct snd_rawmidi_substream *substream;
1493         int idx;
1494
1495         for (idx = 0; idx < count; idx++) {
1496                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1497                 if (!substream)
1498                         return -ENOMEM;
1499                 substream->stream = direction;
1500                 substream->number = idx;
1501                 substream->rmidi = rmidi;
1502                 substream->pstr = stream;
1503                 list_add_tail(&substream->list, &stream->substreams);
1504                 stream->substream_count++;
1505         }
1506         return 0;
1507 }
1508
1509 static void release_rawmidi_device(struct device *dev)
1510 {
1511         kfree(container_of(dev, struct snd_rawmidi, dev));
1512 }
1513
1514 /**
1515  * snd_rawmidi_new - create a rawmidi instance
1516  * @card: the card instance
1517  * @id: the id string
1518  * @device: the device index
1519  * @output_count: the number of output streams
1520  * @input_count: the number of input streams
1521  * @rrawmidi: the pointer to store the new rawmidi instance
1522  *
1523  * Creates a new rawmidi instance.
1524  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1525  *
1526  * Return: Zero if successful, or a negative error code on failure.
1527  */
1528 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1529                     int output_count, int input_count,
1530                     struct snd_rawmidi ** rrawmidi)
1531 {
1532         struct snd_rawmidi *rmidi;
1533         int err;
1534         static struct snd_device_ops ops = {
1535                 .dev_free = snd_rawmidi_dev_free,
1536                 .dev_register = snd_rawmidi_dev_register,
1537                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1538         };
1539
1540         if (snd_BUG_ON(!card))
1541                 return -ENXIO;
1542         if (rrawmidi)
1543                 *rrawmidi = NULL;
1544         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1545         if (!rmidi)
1546                 return -ENOMEM;
1547         rmidi->card = card;
1548         rmidi->device = device;
1549         mutex_init(&rmidi->open_mutex);
1550         init_waitqueue_head(&rmidi->open_wait);
1551         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1552         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1553
1554         if (id != NULL)
1555                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1556
1557         snd_device_initialize(&rmidi->dev, card);
1558         rmidi->dev.release = release_rawmidi_device;
1559         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1560
1561         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1562                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1563                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1564                                                 input_count)) < 0) {
1565                 snd_rawmidi_free(rmidi);
1566                 return err;
1567         }
1568         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1569                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1570                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1571                                                 output_count)) < 0) {
1572                 snd_rawmidi_free(rmidi);
1573                 return err;
1574         }
1575         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1576                 snd_rawmidi_free(rmidi);
1577                 return err;
1578         }
1579         if (rrawmidi)
1580                 *rrawmidi = rmidi;
1581         return 0;
1582 }
1583 EXPORT_SYMBOL(snd_rawmidi_new);
1584
1585 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1586 {
1587         struct snd_rawmidi_substream *substream;
1588
1589         while (!list_empty(&stream->substreams)) {
1590                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1591                 list_del(&substream->list);
1592                 kfree(substream);
1593         }
1594 }
1595
1596 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1597 {
1598         if (!rmidi)
1599                 return 0;
1600
1601         snd_info_free_entry(rmidi->proc_entry);
1602         rmidi->proc_entry = NULL;
1603         mutex_lock(&register_mutex);
1604         if (rmidi->ops && rmidi->ops->dev_unregister)
1605                 rmidi->ops->dev_unregister(rmidi);
1606         mutex_unlock(&register_mutex);
1607
1608         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1609         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1610         if (rmidi->private_free)
1611                 rmidi->private_free(rmidi);
1612         put_device(&rmidi->dev);
1613         return 0;
1614 }
1615
1616 static int snd_rawmidi_dev_free(struct snd_device *device)
1617 {
1618         struct snd_rawmidi *rmidi = device->device_data;
1619         return snd_rawmidi_free(rmidi);
1620 }
1621
1622 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1623 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1624 {
1625         struct snd_rawmidi *rmidi = device->private_data;
1626         rmidi->seq_dev = NULL;
1627 }
1628 #endif
1629
1630 static int snd_rawmidi_dev_register(struct snd_device *device)
1631 {
1632         int err;
1633         struct snd_info_entry *entry;
1634         char name[16];
1635         struct snd_rawmidi *rmidi = device->device_data;
1636
1637         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1638                 return -ENOMEM;
1639         mutex_lock(&register_mutex);
1640         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1641                 mutex_unlock(&register_mutex);
1642                 return -EBUSY;
1643         }
1644         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1645         mutex_unlock(&register_mutex);
1646         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1647                                   rmidi->card, rmidi->device,
1648                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1649         if (err < 0) {
1650                 rmidi_err(rmidi, "unable to register\n");
1651                 mutex_lock(&register_mutex);
1652                 list_del(&rmidi->list);
1653                 mutex_unlock(&register_mutex);
1654                 return err;
1655         }
1656         if (rmidi->ops && rmidi->ops->dev_register &&
1657             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1658                 snd_unregister_device(&rmidi->dev);
1659                 mutex_lock(&register_mutex);
1660                 list_del(&rmidi->list);
1661                 mutex_unlock(&register_mutex);
1662                 return err;
1663         }
1664 #ifdef CONFIG_SND_OSSEMUL
1665         rmidi->ossreg = 0;
1666         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1667                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1668                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1669                                             rmidi) < 0) {
1670                         rmidi_err(rmidi,
1671                                   "unable to register OSS rawmidi device %i:%i\n",
1672                                   rmidi->card->number, 0);
1673                 } else {
1674                         rmidi->ossreg++;
1675 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1676                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1677 #endif
1678                 }
1679         }
1680         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1681                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1682                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1683                                             rmidi) < 0) {
1684                         rmidi_err(rmidi,
1685                                   "unable to register OSS rawmidi device %i:%i\n",
1686                                   rmidi->card->number, 1);
1687                 } else {
1688                         rmidi->ossreg++;
1689                 }
1690         }
1691 #endif /* CONFIG_SND_OSSEMUL */
1692         sprintf(name, "midi%d", rmidi->device);
1693         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1694         if (entry) {
1695                 entry->private_data = rmidi;
1696                 entry->c.text.read = snd_rawmidi_proc_info_read;
1697                 if (snd_info_register(entry) < 0) {
1698                         snd_info_free_entry(entry);
1699                         entry = NULL;
1700                 }
1701         }
1702         rmidi->proc_entry = entry;
1703 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1704         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1705                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1706                         rmidi->seq_dev->private_data = rmidi;
1707                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1708                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1709                         snd_device_register(rmidi->card, rmidi->seq_dev);
1710                 }
1711         }
1712 #endif
1713         return 0;
1714 }
1715
1716 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1717 {
1718         struct snd_rawmidi *rmidi = device->device_data;
1719         int dir;
1720
1721         mutex_lock(&register_mutex);
1722         mutex_lock(&rmidi->open_mutex);
1723         wake_up(&rmidi->open_wait);
1724         list_del_init(&rmidi->list);
1725         for (dir = 0; dir < 2; dir++) {
1726                 struct snd_rawmidi_substream *s;
1727                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1728                         if (s->runtime)
1729                                 wake_up(&s->runtime->sleep);
1730                 }
1731         }
1732
1733 #ifdef CONFIG_SND_OSSEMUL
1734         if (rmidi->ossreg) {
1735                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1736                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1737 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1738                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1739 #endif
1740                 }
1741                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1742                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1743                 rmidi->ossreg = 0;
1744         }
1745 #endif /* CONFIG_SND_OSSEMUL */
1746         snd_unregister_device(&rmidi->dev);
1747         mutex_unlock(&rmidi->open_mutex);
1748         mutex_unlock(&register_mutex);
1749         return 0;
1750 }
1751
1752 /**
1753  * snd_rawmidi_set_ops - set the rawmidi operators
1754  * @rmidi: the rawmidi instance
1755  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1756  * @ops: the operator table
1757  *
1758  * Sets the rawmidi operators for the given stream direction.
1759  */
1760 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1761                          const struct snd_rawmidi_ops *ops)
1762 {
1763         struct snd_rawmidi_substream *substream;
1764         
1765         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1766                 substream->ops = ops;
1767 }
1768 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1769
1770 /*
1771  *  ENTRY functions
1772  */
1773
1774 static int __init alsa_rawmidi_init(void)
1775 {
1776
1777         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1778         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1779 #ifdef CONFIG_SND_OSSEMUL
1780         { int i;
1781         /* check device map table */
1782         for (i = 0; i < SNDRV_CARDS; i++) {
1783                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1784                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1785                                i, midi_map[i]);
1786                         midi_map[i] = 0;
1787                 }
1788                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1789                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1790                                i, amidi_map[i]);
1791                         amidi_map[i] = 1;
1792                 }
1793         }
1794         }
1795 #endif /* CONFIG_SND_OSSEMUL */
1796         return 0;
1797 }
1798
1799 static void __exit alsa_rawmidi_exit(void)
1800 {
1801         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1802         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1803 }
1804
1805 module_init(alsa_rawmidi_init)
1806 module_exit(alsa_rawmidi_exit)