Merge tag 'kbuild-fixes-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahi...
[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 <linux/mm.h>
33 #include <sound/rawmidi.h>
34 #include <sound/info.h>
35 #include <sound/control.h>
36 #include <sound/minors.h>
37 #include <sound/initval.h>
38
39 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
40 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
41 MODULE_LICENSE("GPL");
42
43 #ifdef CONFIG_SND_OSSEMUL
44 static int midi_map[SNDRV_CARDS];
45 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
46 module_param_array(midi_map, int, NULL, 0444);
47 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
48 module_param_array(amidi_map, int, NULL, 0444);
49 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
50 #endif /* CONFIG_SND_OSSEMUL */
51
52 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
53 static int snd_rawmidi_dev_free(struct snd_device *device);
54 static int snd_rawmidi_dev_register(struct snd_device *device);
55 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
56
57 static LIST_HEAD(snd_rawmidi_devices);
58 static DEFINE_MUTEX(register_mutex);
59
60 #define rmidi_err(rmidi, fmt, args...) \
61         dev_err(&(rmidi)->dev, fmt, ##args)
62 #define rmidi_warn(rmidi, fmt, args...) \
63         dev_warn(&(rmidi)->dev, fmt, ##args)
64 #define rmidi_dbg(rmidi, fmt, args...) \
65         dev_dbg(&(rmidi)->dev, fmt, ##args)
66
67 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
68 {
69         struct snd_rawmidi *rawmidi;
70
71         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
72                 if (rawmidi->card == card && rawmidi->device == device)
73                         return rawmidi;
74         return NULL;
75 }
76
77 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
78 {
79         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
80         case FMODE_WRITE:
81                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
82         case FMODE_READ:
83                 return SNDRV_RAWMIDI_LFLG_INPUT;
84         default:
85                 return SNDRV_RAWMIDI_LFLG_OPEN;
86         }
87 }
88
89 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
90 {
91         struct snd_rawmidi_runtime *runtime = substream->runtime;
92
93         return runtime->avail >= runtime->avail_min;
94 }
95
96 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
97                                            size_t count)
98 {
99         struct snd_rawmidi_runtime *runtime = substream->runtime;
100
101         return runtime->avail >= runtime->avail_min &&
102                (!substream->append || runtime->avail >= count);
103 }
104
105 static void snd_rawmidi_input_event_work(struct work_struct *work)
106 {
107         struct snd_rawmidi_runtime *runtime =
108                 container_of(work, struct snd_rawmidi_runtime, event_work);
109
110         if (runtime->event)
111                 runtime->event(runtime->substream);
112 }
113
114 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
115 {
116         struct snd_rawmidi_runtime *runtime;
117
118         runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
119         if (!runtime)
120                 return -ENOMEM;
121         runtime->substream = substream;
122         spin_lock_init(&runtime->lock);
123         init_waitqueue_head(&runtime->sleep);
124         INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
125         runtime->event = NULL;
126         runtime->buffer_size = PAGE_SIZE;
127         runtime->avail_min = 1;
128         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
129                 runtime->avail = 0;
130         else
131                 runtime->avail = runtime->buffer_size;
132         runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
133         if (!runtime->buffer) {
134                 kfree(runtime);
135                 return -ENOMEM;
136         }
137         runtime->appl_ptr = runtime->hw_ptr = 0;
138         substream->runtime = runtime;
139         return 0;
140 }
141
142 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
143 {
144         struct snd_rawmidi_runtime *runtime = substream->runtime;
145
146         kvfree(runtime->buffer);
147         kfree(runtime);
148         substream->runtime = NULL;
149         return 0;
150 }
151
152 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
153 {
154         if (!substream->opened)
155                 return;
156         substream->ops->trigger(substream, up);
157 }
158
159 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
160 {
161         if (!substream->opened)
162                 return;
163         substream->ops->trigger(substream, up);
164         if (!up)
165                 cancel_work_sync(&substream->runtime->event_work);
166 }
167
168 static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
169                                  bool is_input)
170 {
171         runtime->drain = 0;
172         runtime->appl_ptr = runtime->hw_ptr = 0;
173         runtime->avail = is_input ? 0 : runtime->buffer_size;
174 }
175
176 static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
177                                bool is_input)
178 {
179         unsigned long flags;
180
181         spin_lock_irqsave(&runtime->lock, flags);
182         __reset_runtime_ptrs(runtime, is_input);
183         spin_unlock_irqrestore(&runtime->lock, flags);
184 }
185
186 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
187 {
188         snd_rawmidi_output_trigger(substream, 0);
189         reset_runtime_ptrs(substream->runtime, false);
190         return 0;
191 }
192 EXPORT_SYMBOL(snd_rawmidi_drop_output);
193
194 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
195 {
196         int err;
197         long timeout;
198         struct snd_rawmidi_runtime *runtime = substream->runtime;
199
200         err = 0;
201         runtime->drain = 1;
202         timeout = wait_event_interruptible_timeout(runtime->sleep,
203                                 (runtime->avail >= runtime->buffer_size),
204                                 10*HZ);
205         if (signal_pending(current))
206                 err = -ERESTARTSYS;
207         if (runtime->avail < runtime->buffer_size && !timeout) {
208                 rmidi_warn(substream->rmidi,
209                            "rawmidi drain error (avail = %li, buffer_size = %li)\n",
210                            (long)runtime->avail, (long)runtime->buffer_size);
211                 err = -EIO;
212         }
213         runtime->drain = 0;
214         if (err != -ERESTARTSYS) {
215                 /* we need wait a while to make sure that Tx FIFOs are empty */
216                 if (substream->ops->drain)
217                         substream->ops->drain(substream);
218                 else
219                         msleep(50);
220                 snd_rawmidi_drop_output(substream);
221         }
222         return err;
223 }
224 EXPORT_SYMBOL(snd_rawmidi_drain_output);
225
226 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
227 {
228         snd_rawmidi_input_trigger(substream, 0);
229         reset_runtime_ptrs(substream->runtime, true);
230         return 0;
231 }
232 EXPORT_SYMBOL(snd_rawmidi_drain_input);
233
234 /* look for an available substream for the given stream direction;
235  * if a specific subdevice is given, try to assign it
236  */
237 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
238                             int stream, int mode,
239                             struct snd_rawmidi_substream **sub_ret)
240 {
241         struct snd_rawmidi_substream *substream;
242         struct snd_rawmidi_str *s = &rmidi->streams[stream];
243         static unsigned int info_flags[2] = {
244                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
245                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
246         };
247
248         if (!(rmidi->info_flags & info_flags[stream]))
249                 return -ENXIO;
250         if (subdevice >= 0 && subdevice >= s->substream_count)
251                 return -ENODEV;
252
253         list_for_each_entry(substream, &s->substreams, list) {
254                 if (substream->opened) {
255                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
256                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
257                             !substream->append)
258                                 continue;
259                 }
260                 if (subdevice < 0 || subdevice == substream->number) {
261                         *sub_ret = substream;
262                         return 0;
263                 }
264         }
265         return -EAGAIN;
266 }
267
268 /* open and do ref-counting for the given substream */
269 static int open_substream(struct snd_rawmidi *rmidi,
270                           struct snd_rawmidi_substream *substream,
271                           int mode)
272 {
273         int err;
274
275         if (substream->use_count == 0) {
276                 err = snd_rawmidi_runtime_create(substream);
277                 if (err < 0)
278                         return err;
279                 err = substream->ops->open(substream);
280                 if (err < 0) {
281                         snd_rawmidi_runtime_free(substream);
282                         return err;
283                 }
284                 substream->opened = 1;
285                 substream->active_sensing = 0;
286                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
287                         substream->append = 1;
288                 substream->pid = get_pid(task_pid(current));
289                 rmidi->streams[substream->stream].substream_opened++;
290         }
291         substream->use_count++;
292         return 0;
293 }
294
295 static void close_substream(struct snd_rawmidi *rmidi,
296                             struct snd_rawmidi_substream *substream,
297                             int cleanup);
298
299 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
300                              struct snd_rawmidi_file *rfile)
301 {
302         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
303         int err;
304
305         rfile->input = rfile->output = NULL;
306         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
307                 err = assign_substream(rmidi, subdevice,
308                                        SNDRV_RAWMIDI_STREAM_INPUT,
309                                        mode, &sinput);
310                 if (err < 0)
311                         return err;
312         }
313         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
314                 err = assign_substream(rmidi, subdevice,
315                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
316                                        mode, &soutput);
317                 if (err < 0)
318                         return err;
319         }
320
321         if (sinput) {
322                 err = open_substream(rmidi, sinput, mode);
323                 if (err < 0)
324                         return err;
325         }
326         if (soutput) {
327                 err = open_substream(rmidi, soutput, mode);
328                 if (err < 0) {
329                         if (sinput)
330                                 close_substream(rmidi, sinput, 0);
331                         return err;
332                 }
333         }
334
335         rfile->rmidi = rmidi;
336         rfile->input = sinput;
337         rfile->output = soutput;
338         return 0;
339 }
340
341 /* called from sound/core/seq/seq_midi.c */
342 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
343                             int mode, struct snd_rawmidi_file *rfile)
344 {
345         struct snd_rawmidi *rmidi;
346         int err = 0;
347
348         if (snd_BUG_ON(!rfile))
349                 return -EINVAL;
350
351         mutex_lock(&register_mutex);
352         rmidi = snd_rawmidi_search(card, device);
353         if (!rmidi)
354                 err = -ENODEV;
355         else if (!try_module_get(rmidi->card->module))
356                 err = -ENXIO;
357         mutex_unlock(&register_mutex);
358         if (err < 0)
359                 return err;
360
361         mutex_lock(&rmidi->open_mutex);
362         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
363         mutex_unlock(&rmidi->open_mutex);
364         if (err < 0)
365                 module_put(rmidi->card->module);
366         return err;
367 }
368 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
369
370 static int snd_rawmidi_open(struct inode *inode, struct file *file)
371 {
372         int maj = imajor(inode);
373         struct snd_card *card;
374         int subdevice;
375         unsigned short fflags;
376         int err;
377         struct snd_rawmidi *rmidi;
378         struct snd_rawmidi_file *rawmidi_file = NULL;
379         wait_queue_entry_t wait;
380
381         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
382                 return -EINVAL;         /* invalid combination */
383
384         err = nonseekable_open(inode, file);
385         if (err < 0)
386                 return err;
387
388         if (maj == snd_major) {
389                 rmidi = snd_lookup_minor_data(iminor(inode),
390                                               SNDRV_DEVICE_TYPE_RAWMIDI);
391 #ifdef CONFIG_SND_OSSEMUL
392         } else if (maj == SOUND_MAJOR) {
393                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
394                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
395 #endif
396         } else
397                 return -ENXIO;
398
399         if (rmidi == NULL)
400                 return -ENODEV;
401
402         if (!try_module_get(rmidi->card->module)) {
403                 snd_card_unref(rmidi->card);
404                 return -ENXIO;
405         }
406
407         mutex_lock(&rmidi->open_mutex);
408         card = rmidi->card;
409         err = snd_card_file_add(card, file);
410         if (err < 0)
411                 goto __error_card;
412         fflags = snd_rawmidi_file_flags(file);
413         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
414                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
415         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
416         if (rawmidi_file == NULL) {
417                 err = -ENOMEM;
418                 goto __error;
419         }
420         init_waitqueue_entry(&wait, current);
421         add_wait_queue(&rmidi->open_wait, &wait);
422         while (1) {
423                 subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
424                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
425                 if (err >= 0)
426                         break;
427                 if (err == -EAGAIN) {
428                         if (file->f_flags & O_NONBLOCK) {
429                                 err = -EBUSY;
430                                 break;
431                         }
432                 } else
433                         break;
434                 set_current_state(TASK_INTERRUPTIBLE);
435                 mutex_unlock(&rmidi->open_mutex);
436                 schedule();
437                 mutex_lock(&rmidi->open_mutex);
438                 if (rmidi->card->shutdown) {
439                         err = -ENODEV;
440                         break;
441                 }
442                 if (signal_pending(current)) {
443                         err = -ERESTARTSYS;
444                         break;
445                 }
446         }
447         remove_wait_queue(&rmidi->open_wait, &wait);
448         if (err < 0) {
449                 kfree(rawmidi_file);
450                 goto __error;
451         }
452 #ifdef CONFIG_SND_OSSEMUL
453         if (rawmidi_file->input && rawmidi_file->input->runtime)
454                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
455         if (rawmidi_file->output && rawmidi_file->output->runtime)
456                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
457 #endif
458         file->private_data = rawmidi_file;
459         mutex_unlock(&rmidi->open_mutex);
460         snd_card_unref(rmidi->card);
461         return 0;
462
463  __error:
464         snd_card_file_remove(card, file);
465  __error_card:
466         mutex_unlock(&rmidi->open_mutex);
467         module_put(rmidi->card->module);
468         snd_card_unref(rmidi->card);
469         return err;
470 }
471
472 static void close_substream(struct snd_rawmidi *rmidi,
473                             struct snd_rawmidi_substream *substream,
474                             int cleanup)
475 {
476         if (--substream->use_count)
477                 return;
478
479         if (cleanup) {
480                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
481                         snd_rawmidi_input_trigger(substream, 0);
482                 else {
483                         if (substream->active_sensing) {
484                                 unsigned char buf = 0xfe;
485                                 /* sending single active sensing message
486                                  * to shut the device up
487                                  */
488                                 snd_rawmidi_kernel_write(substream, &buf, 1);
489                         }
490                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
491                                 snd_rawmidi_output_trigger(substream, 0);
492                 }
493         }
494         substream->ops->close(substream);
495         if (substream->runtime->private_free)
496                 substream->runtime->private_free(substream);
497         snd_rawmidi_runtime_free(substream);
498         substream->opened = 0;
499         substream->append = 0;
500         put_pid(substream->pid);
501         substream->pid = NULL;
502         rmidi->streams[substream->stream].substream_opened--;
503 }
504
505 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
506 {
507         struct snd_rawmidi *rmidi;
508
509         rmidi = rfile->rmidi;
510         mutex_lock(&rmidi->open_mutex);
511         if (rfile->input) {
512                 close_substream(rmidi, rfile->input, 1);
513                 rfile->input = NULL;
514         }
515         if (rfile->output) {
516                 close_substream(rmidi, rfile->output, 1);
517                 rfile->output = NULL;
518         }
519         rfile->rmidi = NULL;
520         mutex_unlock(&rmidi->open_mutex);
521         wake_up(&rmidi->open_wait);
522 }
523
524 /* called from sound/core/seq/seq_midi.c */
525 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
526 {
527         struct snd_rawmidi *rmidi;
528
529         if (snd_BUG_ON(!rfile))
530                 return -ENXIO;
531
532         rmidi = rfile->rmidi;
533         rawmidi_release_priv(rfile);
534         module_put(rmidi->card->module);
535         return 0;
536 }
537 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
538
539 static int snd_rawmidi_release(struct inode *inode, struct file *file)
540 {
541         struct snd_rawmidi_file *rfile;
542         struct snd_rawmidi *rmidi;
543         struct module *module;
544
545         rfile = file->private_data;
546         rmidi = rfile->rmidi;
547         rawmidi_release_priv(rfile);
548         kfree(rfile);
549         module = rmidi->card->module;
550         snd_card_file_remove(rmidi->card, file);
551         module_put(module);
552         return 0;
553 }
554
555 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
556                             struct snd_rawmidi_info *info)
557 {
558         struct snd_rawmidi *rmidi;
559
560         if (substream == NULL)
561                 return -ENODEV;
562         rmidi = substream->rmidi;
563         memset(info, 0, sizeof(*info));
564         info->card = rmidi->card->number;
565         info->device = rmidi->device;
566         info->subdevice = substream->number;
567         info->stream = substream->stream;
568         info->flags = rmidi->info_flags;
569         strcpy(info->id, rmidi->id);
570         strcpy(info->name, rmidi->name);
571         strcpy(info->subname, substream->name);
572         info->subdevices_count = substream->pstr->substream_count;
573         info->subdevices_avail = (substream->pstr->substream_count -
574                                   substream->pstr->substream_opened);
575         return 0;
576 }
577
578 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
579                                  struct snd_rawmidi_info __user *_info)
580 {
581         struct snd_rawmidi_info info;
582         int err;
583
584         err = snd_rawmidi_info(substream, &info);
585         if (err < 0)
586                 return err;
587         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
588                 return -EFAULT;
589         return 0;
590 }
591
592 static int __snd_rawmidi_info_select(struct snd_card *card,
593                                      struct snd_rawmidi_info *info)
594 {
595         struct snd_rawmidi *rmidi;
596         struct snd_rawmidi_str *pstr;
597         struct snd_rawmidi_substream *substream;
598
599         rmidi = snd_rawmidi_search(card, info->device);
600         if (!rmidi)
601                 return -ENXIO;
602         if (info->stream < 0 || info->stream > 1)
603                 return -EINVAL;
604         pstr = &rmidi->streams[info->stream];
605         if (pstr->substream_count == 0)
606                 return -ENOENT;
607         if (info->subdevice >= pstr->substream_count)
608                 return -ENXIO;
609         list_for_each_entry(substream, &pstr->substreams, list) {
610                 if ((unsigned int)substream->number == info->subdevice)
611                         return snd_rawmidi_info(substream, info);
612         }
613         return -ENXIO;
614 }
615
616 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
617 {
618         int ret;
619
620         mutex_lock(&register_mutex);
621         ret = __snd_rawmidi_info_select(card, info);
622         mutex_unlock(&register_mutex);
623         return ret;
624 }
625 EXPORT_SYMBOL(snd_rawmidi_info_select);
626
627 static int snd_rawmidi_info_select_user(struct snd_card *card,
628                                         struct snd_rawmidi_info __user *_info)
629 {
630         int err;
631         struct snd_rawmidi_info info;
632
633         if (get_user(info.device, &_info->device))
634                 return -EFAULT;
635         if (get_user(info.stream, &_info->stream))
636                 return -EFAULT;
637         if (get_user(info.subdevice, &_info->subdevice))
638                 return -EFAULT;
639         err = snd_rawmidi_info_select(card, &info);
640         if (err < 0)
641                 return err;
642         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
643                 return -EFAULT;
644         return 0;
645 }
646
647 static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
648                                  struct snd_rawmidi_params *params,
649                                  bool is_input)
650 {
651         char *newbuf, *oldbuf;
652
653         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
654                 return -EINVAL;
655         if (params->avail_min < 1 || params->avail_min > params->buffer_size)
656                 return -EINVAL;
657         if (params->buffer_size != runtime->buffer_size) {
658                 newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
659                 if (!newbuf)
660                         return -ENOMEM;
661                 spin_lock_irq(&runtime->lock);
662                 oldbuf = runtime->buffer;
663                 runtime->buffer = newbuf;
664                 runtime->buffer_size = params->buffer_size;
665                 __reset_runtime_ptrs(runtime, is_input);
666                 spin_unlock_irq(&runtime->lock);
667                 kvfree(oldbuf);
668         }
669         runtime->avail_min = params->avail_min;
670         return 0;
671 }
672
673 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
674                               struct snd_rawmidi_params *params)
675 {
676         if (substream->append && substream->use_count > 1)
677                 return -EBUSY;
678         snd_rawmidi_drain_output(substream);
679         substream->active_sensing = !params->no_active_sensing;
680         return resize_runtime_buffer(substream->runtime, params, false);
681 }
682 EXPORT_SYMBOL(snd_rawmidi_output_params);
683
684 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
685                              struct snd_rawmidi_params *params)
686 {
687         snd_rawmidi_drain_input(substream);
688         return resize_runtime_buffer(substream->runtime, params, true);
689 }
690 EXPORT_SYMBOL(snd_rawmidi_input_params);
691
692 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
693                                      struct snd_rawmidi_status *status)
694 {
695         struct snd_rawmidi_runtime *runtime = substream->runtime;
696
697         memset(status, 0, sizeof(*status));
698         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
699         spin_lock_irq(&runtime->lock);
700         status->avail = runtime->avail;
701         spin_unlock_irq(&runtime->lock);
702         return 0;
703 }
704
705 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
706                                     struct snd_rawmidi_status *status)
707 {
708         struct snd_rawmidi_runtime *runtime = substream->runtime;
709
710         memset(status, 0, sizeof(*status));
711         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
712         spin_lock_irq(&runtime->lock);
713         status->avail = runtime->avail;
714         status->xruns = runtime->xruns;
715         runtime->xruns = 0;
716         spin_unlock_irq(&runtime->lock);
717         return 0;
718 }
719
720 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
721 {
722         struct snd_rawmidi_file *rfile;
723         void __user *argp = (void __user *)arg;
724
725         rfile = file->private_data;
726         if (((cmd >> 8) & 0xff) != 'W')
727                 return -ENOTTY;
728         switch (cmd) {
729         case SNDRV_RAWMIDI_IOCTL_PVERSION:
730                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
731         case SNDRV_RAWMIDI_IOCTL_INFO:
732         {
733                 int stream;
734                 struct snd_rawmidi_info __user *info = argp;
735
736                 if (get_user(stream, &info->stream))
737                         return -EFAULT;
738                 switch (stream) {
739                 case SNDRV_RAWMIDI_STREAM_INPUT:
740                         return snd_rawmidi_info_user(rfile->input, info);
741                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
742                         return snd_rawmidi_info_user(rfile->output, info);
743                 default:
744                         return -EINVAL;
745                 }
746         }
747         case SNDRV_RAWMIDI_IOCTL_PARAMS:
748         {
749                 struct snd_rawmidi_params params;
750
751                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
752                         return -EFAULT;
753                 switch (params.stream) {
754                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
755                         if (rfile->output == NULL)
756                                 return -EINVAL;
757                         return snd_rawmidi_output_params(rfile->output, &params);
758                 case SNDRV_RAWMIDI_STREAM_INPUT:
759                         if (rfile->input == NULL)
760                                 return -EINVAL;
761                         return snd_rawmidi_input_params(rfile->input, &params);
762                 default:
763                         return -EINVAL;
764                 }
765         }
766         case SNDRV_RAWMIDI_IOCTL_STATUS:
767         {
768                 int err = 0;
769                 struct snd_rawmidi_status status;
770
771                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
772                         return -EFAULT;
773                 switch (status.stream) {
774                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
775                         if (rfile->output == NULL)
776                                 return -EINVAL;
777                         err = snd_rawmidi_output_status(rfile->output, &status);
778                         break;
779                 case SNDRV_RAWMIDI_STREAM_INPUT:
780                         if (rfile->input == NULL)
781                                 return -EINVAL;
782                         err = snd_rawmidi_input_status(rfile->input, &status);
783                         break;
784                 default:
785                         return -EINVAL;
786                 }
787                 if (err < 0)
788                         return err;
789                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
790                         return -EFAULT;
791                 return 0;
792         }
793         case SNDRV_RAWMIDI_IOCTL_DROP:
794         {
795                 int val;
796
797                 if (get_user(val, (int __user *) argp))
798                         return -EFAULT;
799                 switch (val) {
800                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
801                         if (rfile->output == NULL)
802                                 return -EINVAL;
803                         return snd_rawmidi_drop_output(rfile->output);
804                 default:
805                         return -EINVAL;
806                 }
807         }
808         case SNDRV_RAWMIDI_IOCTL_DRAIN:
809         {
810                 int val;
811
812                 if (get_user(val, (int __user *) argp))
813                         return -EFAULT;
814                 switch (val) {
815                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
816                         if (rfile->output == NULL)
817                                 return -EINVAL;
818                         return snd_rawmidi_drain_output(rfile->output);
819                 case SNDRV_RAWMIDI_STREAM_INPUT:
820                         if (rfile->input == NULL)
821                                 return -EINVAL;
822                         return snd_rawmidi_drain_input(rfile->input);
823                 default:
824                         return -EINVAL;
825                 }
826         }
827         default:
828                 rmidi_dbg(rfile->rmidi,
829                           "rawmidi: unknown command = 0x%x\n", cmd);
830         }
831         return -ENOTTY;
832 }
833
834 static int snd_rawmidi_control_ioctl(struct snd_card *card,
835                                      struct snd_ctl_file *control,
836                                      unsigned int cmd,
837                                      unsigned long arg)
838 {
839         void __user *argp = (void __user *)arg;
840
841         switch (cmd) {
842         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
843         {
844                 int device;
845
846                 if (get_user(device, (int __user *)argp))
847                         return -EFAULT;
848                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
849                         device = SNDRV_RAWMIDI_DEVICES - 1;
850                 mutex_lock(&register_mutex);
851                 device = device < 0 ? 0 : device + 1;
852                 while (device < SNDRV_RAWMIDI_DEVICES) {
853                         if (snd_rawmidi_search(card, device))
854                                 break;
855                         device++;
856                 }
857                 if (device == SNDRV_RAWMIDI_DEVICES)
858                         device = -1;
859                 mutex_unlock(&register_mutex);
860                 if (put_user(device, (int __user *)argp))
861                         return -EFAULT;
862                 return 0;
863         }
864         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
865         {
866                 int val;
867
868                 if (get_user(val, (int __user *)argp))
869                         return -EFAULT;
870                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
871                 return 0;
872         }
873         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
874                 return snd_rawmidi_info_select_user(card, argp);
875         }
876         return -ENOIOCTLCMD;
877 }
878
879 /**
880  * snd_rawmidi_receive - receive the input data from the device
881  * @substream: the rawmidi substream
882  * @buffer: the buffer pointer
883  * @count: the data size to read
884  *
885  * Reads the data from the internal buffer.
886  *
887  * Return: The size of read data, or a negative error code on failure.
888  */
889 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
890                         const unsigned char *buffer, int count)
891 {
892         unsigned long flags;
893         int result = 0, count1;
894         struct snd_rawmidi_runtime *runtime = substream->runtime;
895
896         if (!substream->opened)
897                 return -EBADFD;
898         if (runtime->buffer == NULL) {
899                 rmidi_dbg(substream->rmidi,
900                           "snd_rawmidi_receive: input is not active!!!\n");
901                 return -EINVAL;
902         }
903         spin_lock_irqsave(&runtime->lock, flags);
904         if (count == 1) {       /* special case, faster code */
905                 substream->bytes++;
906                 if (runtime->avail < runtime->buffer_size) {
907                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
908                         runtime->hw_ptr %= runtime->buffer_size;
909                         runtime->avail++;
910                         result++;
911                 } else {
912                         runtime->xruns++;
913                 }
914         } else {
915                 substream->bytes += count;
916                 count1 = runtime->buffer_size - runtime->hw_ptr;
917                 if (count1 > count)
918                         count1 = count;
919                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
920                         count1 = runtime->buffer_size - runtime->avail;
921                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
922                 runtime->hw_ptr += count1;
923                 runtime->hw_ptr %= runtime->buffer_size;
924                 runtime->avail += count1;
925                 count -= count1;
926                 result += count1;
927                 if (count > 0) {
928                         buffer += count1;
929                         count1 = count;
930                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
931                                 count1 = runtime->buffer_size - runtime->avail;
932                                 runtime->xruns += count - count1;
933                         }
934                         if (count1 > 0) {
935                                 memcpy(runtime->buffer, buffer, count1);
936                                 runtime->hw_ptr = count1;
937                                 runtime->avail += count1;
938                                 result += count1;
939                         }
940                 }
941         }
942         if (result > 0) {
943                 if (runtime->event)
944                         schedule_work(&runtime->event_work);
945                 else if (snd_rawmidi_ready(substream))
946                         wake_up(&runtime->sleep);
947         }
948         spin_unlock_irqrestore(&runtime->lock, flags);
949         return result;
950 }
951 EXPORT_SYMBOL(snd_rawmidi_receive);
952
953 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
954                                      unsigned char __user *userbuf,
955                                      unsigned char *kernelbuf, long count)
956 {
957         unsigned long flags;
958         long result = 0, count1;
959         struct snd_rawmidi_runtime *runtime = substream->runtime;
960         unsigned long appl_ptr;
961
962         spin_lock_irqsave(&runtime->lock, flags);
963         while (count > 0 && runtime->avail) {
964                 count1 = runtime->buffer_size - runtime->appl_ptr;
965                 if (count1 > count)
966                         count1 = count;
967                 if (count1 > (int)runtime->avail)
968                         count1 = runtime->avail;
969
970                 /* update runtime->appl_ptr before unlocking for userbuf */
971                 appl_ptr = runtime->appl_ptr;
972                 runtime->appl_ptr += count1;
973                 runtime->appl_ptr %= runtime->buffer_size;
974                 runtime->avail -= count1;
975
976                 if (kernelbuf)
977                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
978                 if (userbuf) {
979                         spin_unlock_irqrestore(&runtime->lock, flags);
980                         if (copy_to_user(userbuf + result,
981                                          runtime->buffer + appl_ptr, count1)) {
982                                 return result > 0 ? result : -EFAULT;
983                         }
984                         spin_lock_irqsave(&runtime->lock, flags);
985                 }
986                 result += count1;
987                 count -= count1;
988         }
989         spin_unlock_irqrestore(&runtime->lock, flags);
990         return result;
991 }
992
993 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
994                              unsigned char *buf, long count)
995 {
996         snd_rawmidi_input_trigger(substream, 1);
997         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
998 }
999 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1000
1001 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1002                                 loff_t *offset)
1003 {
1004         long result;
1005         int count1;
1006         struct snd_rawmidi_file *rfile;
1007         struct snd_rawmidi_substream *substream;
1008         struct snd_rawmidi_runtime *runtime;
1009
1010         rfile = file->private_data;
1011         substream = rfile->input;
1012         if (substream == NULL)
1013                 return -EIO;
1014         runtime = substream->runtime;
1015         snd_rawmidi_input_trigger(substream, 1);
1016         result = 0;
1017         while (count > 0) {
1018                 spin_lock_irq(&runtime->lock);
1019                 while (!snd_rawmidi_ready(substream)) {
1020                         wait_queue_entry_t wait;
1021
1022                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1023                                 spin_unlock_irq(&runtime->lock);
1024                                 return result > 0 ? result : -EAGAIN;
1025                         }
1026                         init_waitqueue_entry(&wait, current);
1027                         add_wait_queue(&runtime->sleep, &wait);
1028                         set_current_state(TASK_INTERRUPTIBLE);
1029                         spin_unlock_irq(&runtime->lock);
1030                         schedule();
1031                         remove_wait_queue(&runtime->sleep, &wait);
1032                         if (rfile->rmidi->card->shutdown)
1033                                 return -ENODEV;
1034                         if (signal_pending(current))
1035                                 return result > 0 ? result : -ERESTARTSYS;
1036                         if (!runtime->avail)
1037                                 return result > 0 ? result : -EIO;
1038                         spin_lock_irq(&runtime->lock);
1039                 }
1040                 spin_unlock_irq(&runtime->lock);
1041                 count1 = snd_rawmidi_kernel_read1(substream,
1042                                                   (unsigned char __user *)buf,
1043                                                   NULL/*kernelbuf*/,
1044                                                   count);
1045                 if (count1 < 0)
1046                         return result > 0 ? result : count1;
1047                 result += count1;
1048                 buf += count1;
1049                 count -= count1;
1050         }
1051         return result;
1052 }
1053
1054 /**
1055  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1056  * @substream: the rawmidi substream
1057  *
1058  * Return: 1 if the internal output buffer is empty, 0 if not.
1059  */
1060 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1061 {
1062         struct snd_rawmidi_runtime *runtime = substream->runtime;
1063         int result;
1064         unsigned long flags;
1065
1066         if (runtime->buffer == NULL) {
1067                 rmidi_dbg(substream->rmidi,
1068                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1069                 return 1;
1070         }
1071         spin_lock_irqsave(&runtime->lock, flags);
1072         result = runtime->avail >= runtime->buffer_size;
1073         spin_unlock_irqrestore(&runtime->lock, flags);
1074         return result;
1075 }
1076 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1077
1078 /**
1079  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1080  * @substream: the rawmidi substream
1081  * @buffer: the buffer pointer
1082  * @count: data size to transfer
1083  *
1084  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1085  */
1086 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1087                               unsigned char *buffer, int count)
1088 {
1089         int result, count1;
1090         struct snd_rawmidi_runtime *runtime = substream->runtime;
1091
1092         if (runtime->buffer == NULL) {
1093                 rmidi_dbg(substream->rmidi,
1094                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1095                 return -EINVAL;
1096         }
1097         result = 0;
1098         if (runtime->avail >= runtime->buffer_size) {
1099                 /* warning: lowlevel layer MUST trigger down the hardware */
1100                 goto __skip;
1101         }
1102         if (count == 1) {       /* special case, faster code */
1103                 *buffer = runtime->buffer[runtime->hw_ptr];
1104                 result++;
1105         } else {
1106                 count1 = runtime->buffer_size - runtime->hw_ptr;
1107                 if (count1 > count)
1108                         count1 = count;
1109                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1110                         count1 = runtime->buffer_size - runtime->avail;
1111                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1112                 count -= count1;
1113                 result += count1;
1114                 if (count > 0) {
1115                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1116                                 count = runtime->buffer_size - runtime->avail - count1;
1117                         memcpy(buffer + count1, runtime->buffer, count);
1118                         result += count;
1119                 }
1120         }
1121       __skip:
1122         return result;
1123 }
1124 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1125
1126 /**
1127  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1128  * @substream: the rawmidi substream
1129  * @buffer: the buffer pointer
1130  * @count: data size to transfer
1131  *
1132  * Copies data from the internal output buffer to the given buffer.
1133  *
1134  * Call this in the interrupt handler when the midi output is ready,
1135  * and call snd_rawmidi_transmit_ack() after the transmission is
1136  * finished.
1137  *
1138  * Return: The size of copied data, or a negative error code on failure.
1139  */
1140 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1141                               unsigned char *buffer, int count)
1142 {
1143         struct snd_rawmidi_runtime *runtime = substream->runtime;
1144         int result;
1145         unsigned long flags;
1146
1147         spin_lock_irqsave(&runtime->lock, flags);
1148         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1149         spin_unlock_irqrestore(&runtime->lock, flags);
1150         return result;
1151 }
1152 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1153
1154 /**
1155  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1156  * @substream: the rawmidi substream
1157  * @count: the transferred count
1158  *
1159  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1160  */
1161 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1162 {
1163         struct snd_rawmidi_runtime *runtime = substream->runtime;
1164
1165         if (runtime->buffer == NULL) {
1166                 rmidi_dbg(substream->rmidi,
1167                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1168                 return -EINVAL;
1169         }
1170         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1171         runtime->hw_ptr += count;
1172         runtime->hw_ptr %= runtime->buffer_size;
1173         runtime->avail += count;
1174         substream->bytes += count;
1175         if (count > 0) {
1176                 if (runtime->drain || snd_rawmidi_ready(substream))
1177                         wake_up(&runtime->sleep);
1178         }
1179         return count;
1180 }
1181 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1182
1183 /**
1184  * snd_rawmidi_transmit_ack - acknowledge the transmission
1185  * @substream: the rawmidi substream
1186  * @count: the transferred count
1187  *
1188  * Advances the hardware pointer for the internal output buffer with
1189  * the given size and updates the condition.
1190  * Call after the transmission is finished.
1191  *
1192  * Return: The advanced size if successful, or a negative error code on failure.
1193  */
1194 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1195 {
1196         struct snd_rawmidi_runtime *runtime = substream->runtime;
1197         int result;
1198         unsigned long flags;
1199
1200         spin_lock_irqsave(&runtime->lock, flags);
1201         result = __snd_rawmidi_transmit_ack(substream, count);
1202         spin_unlock_irqrestore(&runtime->lock, flags);
1203         return result;
1204 }
1205 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1206
1207 /**
1208  * snd_rawmidi_transmit - copy from the buffer to the device
1209  * @substream: the rawmidi substream
1210  * @buffer: the buffer pointer
1211  * @count: the data size to transfer
1212  *
1213  * Copies data from the buffer to the device and advances the pointer.
1214  *
1215  * Return: The copied size if successful, or a negative error code on failure.
1216  */
1217 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1218                          unsigned char *buffer, int count)
1219 {
1220         struct snd_rawmidi_runtime *runtime = substream->runtime;
1221         int result;
1222         unsigned long flags;
1223
1224         spin_lock_irqsave(&runtime->lock, flags);
1225         if (!substream->opened)
1226                 result = -EBADFD;
1227         else {
1228                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1229                 if (count <= 0)
1230                         result = count;
1231                 else
1232                         result = __snd_rawmidi_transmit_ack(substream, count);
1233         }
1234         spin_unlock_irqrestore(&runtime->lock, flags);
1235         return result;
1236 }
1237 EXPORT_SYMBOL(snd_rawmidi_transmit);
1238
1239 /**
1240  * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1241  * @substream: rawmidi substream
1242  *
1243  * Return: the number of discarded bytes
1244  */
1245 int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1246 {
1247         struct snd_rawmidi_runtime *runtime = substream->runtime;
1248         unsigned long flags;
1249         int count = 0;
1250
1251         spin_lock_irqsave(&runtime->lock, flags);
1252         if (runtime->avail < runtime->buffer_size) {
1253                 count = runtime->buffer_size - runtime->avail;
1254                 __snd_rawmidi_transmit_ack(substream, count);
1255         }
1256         spin_unlock_irqrestore(&runtime->lock, flags);
1257         return count;
1258 }
1259 EXPORT_SYMBOL(snd_rawmidi_proceed);
1260
1261 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1262                                       const unsigned char __user *userbuf,
1263                                       const unsigned char *kernelbuf,
1264                                       long count)
1265 {
1266         unsigned long flags;
1267         long count1, result;
1268         struct snd_rawmidi_runtime *runtime = substream->runtime;
1269         unsigned long appl_ptr;
1270
1271         if (!kernelbuf && !userbuf)
1272                 return -EINVAL;
1273         if (snd_BUG_ON(!runtime->buffer))
1274                 return -EINVAL;
1275
1276         result = 0;
1277         spin_lock_irqsave(&runtime->lock, flags);
1278         if (substream->append) {
1279                 if ((long)runtime->avail < count) {
1280                         spin_unlock_irqrestore(&runtime->lock, flags);
1281                         return -EAGAIN;
1282                 }
1283         }
1284         while (count > 0 && runtime->avail > 0) {
1285                 count1 = runtime->buffer_size - runtime->appl_ptr;
1286                 if (count1 > count)
1287                         count1 = count;
1288                 if (count1 > (long)runtime->avail)
1289                         count1 = runtime->avail;
1290
1291                 /* update runtime->appl_ptr before unlocking for userbuf */
1292                 appl_ptr = runtime->appl_ptr;
1293                 runtime->appl_ptr += count1;
1294                 runtime->appl_ptr %= runtime->buffer_size;
1295                 runtime->avail -= count1;
1296
1297                 if (kernelbuf)
1298                         memcpy(runtime->buffer + appl_ptr,
1299                                kernelbuf + result, count1);
1300                 else if (userbuf) {
1301                         spin_unlock_irqrestore(&runtime->lock, flags);
1302                         if (copy_from_user(runtime->buffer + appl_ptr,
1303                                            userbuf + result, count1)) {
1304                                 spin_lock_irqsave(&runtime->lock, flags);
1305                                 result = result > 0 ? result : -EFAULT;
1306                                 goto __end;
1307                         }
1308                         spin_lock_irqsave(&runtime->lock, flags);
1309                 }
1310                 result += count1;
1311                 count -= count1;
1312         }
1313       __end:
1314         count1 = runtime->avail < runtime->buffer_size;
1315         spin_unlock_irqrestore(&runtime->lock, flags);
1316         if (count1)
1317                 snd_rawmidi_output_trigger(substream, 1);
1318         return result;
1319 }
1320
1321 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1322                               const unsigned char *buf, long count)
1323 {
1324         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1325 }
1326 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1327
1328 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1329                                  size_t count, loff_t *offset)
1330 {
1331         long result, timeout;
1332         int count1;
1333         struct snd_rawmidi_file *rfile;
1334         struct snd_rawmidi_runtime *runtime;
1335         struct snd_rawmidi_substream *substream;
1336
1337         rfile = file->private_data;
1338         substream = rfile->output;
1339         runtime = substream->runtime;
1340         /* we cannot put an atomic message to our buffer */
1341         if (substream->append && count > runtime->buffer_size)
1342                 return -EIO;
1343         result = 0;
1344         while (count > 0) {
1345                 spin_lock_irq(&runtime->lock);
1346                 while (!snd_rawmidi_ready_append(substream, count)) {
1347                         wait_queue_entry_t wait;
1348
1349                         if (file->f_flags & O_NONBLOCK) {
1350                                 spin_unlock_irq(&runtime->lock);
1351                                 return result > 0 ? result : -EAGAIN;
1352                         }
1353                         init_waitqueue_entry(&wait, current);
1354                         add_wait_queue(&runtime->sleep, &wait);
1355                         set_current_state(TASK_INTERRUPTIBLE);
1356                         spin_unlock_irq(&runtime->lock);
1357                         timeout = schedule_timeout(30 * HZ);
1358                         remove_wait_queue(&runtime->sleep, &wait);
1359                         if (rfile->rmidi->card->shutdown)
1360                                 return -ENODEV;
1361                         if (signal_pending(current))
1362                                 return result > 0 ? result : -ERESTARTSYS;
1363                         if (!runtime->avail && !timeout)
1364                                 return result > 0 ? result : -EIO;
1365                         spin_lock_irq(&runtime->lock);
1366                 }
1367                 spin_unlock_irq(&runtime->lock);
1368                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1369                 if (count1 < 0)
1370                         return result > 0 ? result : count1;
1371                 result += count1;
1372                 buf += count1;
1373                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1374                         break;
1375                 count -= count1;
1376         }
1377         if (file->f_flags & O_DSYNC) {
1378                 spin_lock_irq(&runtime->lock);
1379                 while (runtime->avail != runtime->buffer_size) {
1380                         wait_queue_entry_t wait;
1381                         unsigned int last_avail = runtime->avail;
1382
1383                         init_waitqueue_entry(&wait, current);
1384                         add_wait_queue(&runtime->sleep, &wait);
1385                         set_current_state(TASK_INTERRUPTIBLE);
1386                         spin_unlock_irq(&runtime->lock);
1387                         timeout = schedule_timeout(30 * HZ);
1388                         remove_wait_queue(&runtime->sleep, &wait);
1389                         if (signal_pending(current))
1390                                 return result > 0 ? result : -ERESTARTSYS;
1391                         if (runtime->avail == last_avail && !timeout)
1392                                 return result > 0 ? result : -EIO;
1393                         spin_lock_irq(&runtime->lock);
1394                 }
1395                 spin_unlock_irq(&runtime->lock);
1396         }
1397         return result;
1398 }
1399
1400 static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1401 {
1402         struct snd_rawmidi_file *rfile;
1403         struct snd_rawmidi_runtime *runtime;
1404         __poll_t mask;
1405
1406         rfile = file->private_data;
1407         if (rfile->input != NULL) {
1408                 runtime = rfile->input->runtime;
1409                 snd_rawmidi_input_trigger(rfile->input, 1);
1410                 poll_wait(file, &runtime->sleep, wait);
1411         }
1412         if (rfile->output != NULL) {
1413                 runtime = rfile->output->runtime;
1414                 poll_wait(file, &runtime->sleep, wait);
1415         }
1416         mask = 0;
1417         if (rfile->input != NULL) {
1418                 if (snd_rawmidi_ready(rfile->input))
1419                         mask |= EPOLLIN | EPOLLRDNORM;
1420         }
1421         if (rfile->output != NULL) {
1422                 if (snd_rawmidi_ready(rfile->output))
1423                         mask |= EPOLLOUT | EPOLLWRNORM;
1424         }
1425         return mask;
1426 }
1427
1428 /*
1429  */
1430 #ifdef CONFIG_COMPAT
1431 #include "rawmidi_compat.c"
1432 #else
1433 #define snd_rawmidi_ioctl_compat        NULL
1434 #endif
1435
1436 /*
1437  */
1438
1439 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1440                                        struct snd_info_buffer *buffer)
1441 {
1442         struct snd_rawmidi *rmidi;
1443         struct snd_rawmidi_substream *substream;
1444         struct snd_rawmidi_runtime *runtime;
1445
1446         rmidi = entry->private_data;
1447         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1448         mutex_lock(&rmidi->open_mutex);
1449         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1450                 list_for_each_entry(substream,
1451                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1452                                     list) {
1453                         snd_iprintf(buffer,
1454                                     "Output %d\n"
1455                                     "  Tx bytes     : %lu\n",
1456                                     substream->number,
1457                                     (unsigned long) substream->bytes);
1458                         if (substream->opened) {
1459                                 snd_iprintf(buffer,
1460                                     "  Owner PID    : %d\n",
1461                                     pid_vnr(substream->pid));
1462                                 runtime = substream->runtime;
1463                                 snd_iprintf(buffer,
1464                                     "  Mode         : %s\n"
1465                                     "  Buffer size  : %lu\n"
1466                                     "  Avail        : %lu\n",
1467                                     runtime->oss ? "OSS compatible" : "native",
1468                                     (unsigned long) runtime->buffer_size,
1469                                     (unsigned long) runtime->avail);
1470                         }
1471                 }
1472         }
1473         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1474                 list_for_each_entry(substream,
1475                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1476                                     list) {
1477                         snd_iprintf(buffer,
1478                                     "Input %d\n"
1479                                     "  Rx bytes     : %lu\n",
1480                                     substream->number,
1481                                     (unsigned long) substream->bytes);
1482                         if (substream->opened) {
1483                                 snd_iprintf(buffer,
1484                                             "  Owner PID    : %d\n",
1485                                             pid_vnr(substream->pid));
1486                                 runtime = substream->runtime;
1487                                 snd_iprintf(buffer,
1488                                             "  Buffer size  : %lu\n"
1489                                             "  Avail        : %lu\n"
1490                                             "  Overruns     : %lu\n",
1491                                             (unsigned long) runtime->buffer_size,
1492                                             (unsigned long) runtime->avail,
1493                                             (unsigned long) runtime->xruns);
1494                         }
1495                 }
1496         }
1497         mutex_unlock(&rmidi->open_mutex);
1498 }
1499
1500 /*
1501  *  Register functions
1502  */
1503
1504 static const struct file_operations snd_rawmidi_f_ops = {
1505         .owner =        THIS_MODULE,
1506         .read =         snd_rawmidi_read,
1507         .write =        snd_rawmidi_write,
1508         .open =         snd_rawmidi_open,
1509         .release =      snd_rawmidi_release,
1510         .llseek =       no_llseek,
1511         .poll =         snd_rawmidi_poll,
1512         .unlocked_ioctl =       snd_rawmidi_ioctl,
1513         .compat_ioctl = snd_rawmidi_ioctl_compat,
1514 };
1515
1516 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1517                                         struct snd_rawmidi_str *stream,
1518                                         int direction,
1519                                         int count)
1520 {
1521         struct snd_rawmidi_substream *substream;
1522         int idx;
1523
1524         for (idx = 0; idx < count; idx++) {
1525                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1526                 if (!substream)
1527                         return -ENOMEM;
1528                 substream->stream = direction;
1529                 substream->number = idx;
1530                 substream->rmidi = rmidi;
1531                 substream->pstr = stream;
1532                 list_add_tail(&substream->list, &stream->substreams);
1533                 stream->substream_count++;
1534         }
1535         return 0;
1536 }
1537
1538 static void release_rawmidi_device(struct device *dev)
1539 {
1540         kfree(container_of(dev, struct snd_rawmidi, dev));
1541 }
1542
1543 /**
1544  * snd_rawmidi_new - create a rawmidi instance
1545  * @card: the card instance
1546  * @id: the id string
1547  * @device: the device index
1548  * @output_count: the number of output streams
1549  * @input_count: the number of input streams
1550  * @rrawmidi: the pointer to store the new rawmidi instance
1551  *
1552  * Creates a new rawmidi instance.
1553  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1554  *
1555  * Return: Zero if successful, or a negative error code on failure.
1556  */
1557 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1558                     int output_count, int input_count,
1559                     struct snd_rawmidi **rrawmidi)
1560 {
1561         struct snd_rawmidi *rmidi;
1562         int err;
1563         static struct snd_device_ops ops = {
1564                 .dev_free = snd_rawmidi_dev_free,
1565                 .dev_register = snd_rawmidi_dev_register,
1566                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1567         };
1568
1569         if (snd_BUG_ON(!card))
1570                 return -ENXIO;
1571         if (rrawmidi)
1572                 *rrawmidi = NULL;
1573         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1574         if (!rmidi)
1575                 return -ENOMEM;
1576         rmidi->card = card;
1577         rmidi->device = device;
1578         mutex_init(&rmidi->open_mutex);
1579         init_waitqueue_head(&rmidi->open_wait);
1580         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1581         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1582
1583         if (id != NULL)
1584                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1585
1586         snd_device_initialize(&rmidi->dev, card);
1587         rmidi->dev.release = release_rawmidi_device;
1588         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1589
1590         err = snd_rawmidi_alloc_substreams(rmidi,
1591                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1592                                            SNDRV_RAWMIDI_STREAM_INPUT,
1593                                            input_count);
1594         if (err < 0)
1595                 goto error;
1596         err = snd_rawmidi_alloc_substreams(rmidi,
1597                                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1598                                            SNDRV_RAWMIDI_STREAM_OUTPUT,
1599                                            output_count);
1600         if (err < 0)
1601                 goto error;
1602         err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1603         if (err < 0)
1604                 goto error;
1605
1606         if (rrawmidi)
1607                 *rrawmidi = rmidi;
1608         return 0;
1609
1610  error:
1611         snd_rawmidi_free(rmidi);
1612         return err;
1613 }
1614 EXPORT_SYMBOL(snd_rawmidi_new);
1615
1616 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1617 {
1618         struct snd_rawmidi_substream *substream;
1619
1620         while (!list_empty(&stream->substreams)) {
1621                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1622                 list_del(&substream->list);
1623                 kfree(substream);
1624         }
1625 }
1626
1627 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1628 {
1629         if (!rmidi)
1630                 return 0;
1631
1632         snd_info_free_entry(rmidi->proc_entry);
1633         rmidi->proc_entry = NULL;
1634         mutex_lock(&register_mutex);
1635         if (rmidi->ops && rmidi->ops->dev_unregister)
1636                 rmidi->ops->dev_unregister(rmidi);
1637         mutex_unlock(&register_mutex);
1638
1639         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1640         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1641         if (rmidi->private_free)
1642                 rmidi->private_free(rmidi);
1643         put_device(&rmidi->dev);
1644         return 0;
1645 }
1646
1647 static int snd_rawmidi_dev_free(struct snd_device *device)
1648 {
1649         struct snd_rawmidi *rmidi = device->device_data;
1650
1651         return snd_rawmidi_free(rmidi);
1652 }
1653
1654 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1655 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1656 {
1657         struct snd_rawmidi *rmidi = device->private_data;
1658
1659         rmidi->seq_dev = NULL;
1660 }
1661 #endif
1662
1663 static int snd_rawmidi_dev_register(struct snd_device *device)
1664 {
1665         int err;
1666         struct snd_info_entry *entry;
1667         char name[16];
1668         struct snd_rawmidi *rmidi = device->device_data;
1669
1670         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1671                 return -ENOMEM;
1672         err = 0;
1673         mutex_lock(&register_mutex);
1674         if (snd_rawmidi_search(rmidi->card, rmidi->device))
1675                 err = -EBUSY;
1676         else
1677                 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1678         mutex_unlock(&register_mutex);
1679         if (err < 0)
1680                 return err;
1681
1682         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1683                                   rmidi->card, rmidi->device,
1684                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1685         if (err < 0) {
1686                 rmidi_err(rmidi, "unable to register\n");
1687                 goto error;
1688         }
1689         if (rmidi->ops && rmidi->ops->dev_register) {
1690                 err = rmidi->ops->dev_register(rmidi);
1691                 if (err < 0)
1692                         goto error_unregister;
1693         }
1694 #ifdef CONFIG_SND_OSSEMUL
1695         rmidi->ossreg = 0;
1696         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1697                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1698                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1699                                             rmidi) < 0) {
1700                         rmidi_err(rmidi,
1701                                   "unable to register OSS rawmidi device %i:%i\n",
1702                                   rmidi->card->number, 0);
1703                 } else {
1704                         rmidi->ossreg++;
1705 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1706                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1707 #endif
1708                 }
1709         }
1710         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1711                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1712                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1713                                             rmidi) < 0) {
1714                         rmidi_err(rmidi,
1715                                   "unable to register OSS rawmidi device %i:%i\n",
1716                                   rmidi->card->number, 1);
1717                 } else {
1718                         rmidi->ossreg++;
1719                 }
1720         }
1721 #endif /* CONFIG_SND_OSSEMUL */
1722         sprintf(name, "midi%d", rmidi->device);
1723         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1724         if (entry) {
1725                 entry->private_data = rmidi;
1726                 entry->c.text.read = snd_rawmidi_proc_info_read;
1727                 if (snd_info_register(entry) < 0) {
1728                         snd_info_free_entry(entry);
1729                         entry = NULL;
1730                 }
1731         }
1732         rmidi->proc_entry = entry;
1733 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1734         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1735                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1736                         rmidi->seq_dev->private_data = rmidi;
1737                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1738                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1739                         snd_device_register(rmidi->card, rmidi->seq_dev);
1740                 }
1741         }
1742 #endif
1743         return 0;
1744
1745  error_unregister:
1746         snd_unregister_device(&rmidi->dev);
1747  error:
1748         mutex_lock(&register_mutex);
1749         list_del(&rmidi->list);
1750         mutex_unlock(&register_mutex);
1751         return err;
1752 }
1753
1754 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1755 {
1756         struct snd_rawmidi *rmidi = device->device_data;
1757         int dir;
1758
1759         mutex_lock(&register_mutex);
1760         mutex_lock(&rmidi->open_mutex);
1761         wake_up(&rmidi->open_wait);
1762         list_del_init(&rmidi->list);
1763         for (dir = 0; dir < 2; dir++) {
1764                 struct snd_rawmidi_substream *s;
1765
1766                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1767                         if (s->runtime)
1768                                 wake_up(&s->runtime->sleep);
1769                 }
1770         }
1771
1772 #ifdef CONFIG_SND_OSSEMUL
1773         if (rmidi->ossreg) {
1774                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1775                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1776 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1777                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1778 #endif
1779                 }
1780                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1781                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1782                 rmidi->ossreg = 0;
1783         }
1784 #endif /* CONFIG_SND_OSSEMUL */
1785         snd_unregister_device(&rmidi->dev);
1786         mutex_unlock(&rmidi->open_mutex);
1787         mutex_unlock(&register_mutex);
1788         return 0;
1789 }
1790
1791 /**
1792  * snd_rawmidi_set_ops - set the rawmidi operators
1793  * @rmidi: the rawmidi instance
1794  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1795  * @ops: the operator table
1796  *
1797  * Sets the rawmidi operators for the given stream direction.
1798  */
1799 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1800                          const struct snd_rawmidi_ops *ops)
1801 {
1802         struct snd_rawmidi_substream *substream;
1803
1804         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1805                 substream->ops = ops;
1806 }
1807 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1808
1809 /*
1810  *  ENTRY functions
1811  */
1812
1813 static int __init alsa_rawmidi_init(void)
1814 {
1815
1816         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1817         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1818 #ifdef CONFIG_SND_OSSEMUL
1819         { int i;
1820         /* check device map table */
1821         for (i = 0; i < SNDRV_CARDS; i++) {
1822                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1823                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1824                                i, midi_map[i]);
1825                         midi_map[i] = 0;
1826                 }
1827                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1828                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1829                                i, amidi_map[i]);
1830                         amidi_map[i] = 1;
1831                 }
1832         }
1833         }
1834 #endif /* CONFIG_SND_OSSEMUL */
1835         return 0;
1836 }
1837
1838 static void __exit alsa_rawmidi_exit(void)
1839 {
1840         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1841         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1842 }
1843
1844 module_init(alsa_rawmidi_init)
1845 module_exit(alsa_rawmidi_exit)