Do not hash userspace addresses in fault handlers
[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 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
583 {
584         struct snd_rawmidi *rmidi;
585         struct snd_rawmidi_str *pstr;
586         struct snd_rawmidi_substream *substream;
587
588         mutex_lock(&register_mutex);
589         rmidi = snd_rawmidi_search(card, info->device);
590         mutex_unlock(&register_mutex);
591         if (!rmidi)
592                 return -ENXIO;
593         if (info->stream < 0 || info->stream > 1)
594                 return -EINVAL;
595         pstr = &rmidi->streams[info->stream];
596         if (pstr->substream_count == 0)
597                 return -ENOENT;
598         if (info->subdevice >= pstr->substream_count)
599                 return -ENXIO;
600         list_for_each_entry(substream, &pstr->substreams, list) {
601                 if ((unsigned int)substream->number == info->subdevice)
602                         return snd_rawmidi_info(substream, info);
603         }
604         return -ENXIO;
605 }
606 EXPORT_SYMBOL(snd_rawmidi_info_select);
607
608 static int snd_rawmidi_info_select_user(struct snd_card *card,
609                                         struct snd_rawmidi_info __user *_info)
610 {
611         int err;
612         struct snd_rawmidi_info info;
613         if (get_user(info.device, &_info->device))
614                 return -EFAULT;
615         if (get_user(info.stream, &_info->stream))
616                 return -EFAULT;
617         if (get_user(info.subdevice, &_info->subdevice))
618                 return -EFAULT;
619         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
620                 return err;
621         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
622                 return -EFAULT;
623         return 0;
624 }
625
626 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
627                               struct snd_rawmidi_params * params)
628 {
629         char *newbuf;
630         struct snd_rawmidi_runtime *runtime = substream->runtime;
631         
632         if (substream->append && substream->use_count > 1)
633                 return -EBUSY;
634         snd_rawmidi_drain_output(substream);
635         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
636                 return -EINVAL;
637         }
638         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
639                 return -EINVAL;
640         }
641         if (params->buffer_size != runtime->buffer_size) {
642                 newbuf = krealloc(runtime->buffer, params->buffer_size,
643                                   GFP_KERNEL);
644                 if (!newbuf)
645                         return -ENOMEM;
646                 runtime->buffer = newbuf;
647                 runtime->buffer_size = params->buffer_size;
648                 runtime->avail = runtime->buffer_size;
649         }
650         runtime->avail_min = params->avail_min;
651         substream->active_sensing = !params->no_active_sensing;
652         return 0;
653 }
654 EXPORT_SYMBOL(snd_rawmidi_output_params);
655
656 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
657                              struct snd_rawmidi_params * params)
658 {
659         char *newbuf;
660         struct snd_rawmidi_runtime *runtime = substream->runtime;
661
662         snd_rawmidi_drain_input(substream);
663         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
664                 return -EINVAL;
665         }
666         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
667                 return -EINVAL;
668         }
669         if (params->buffer_size != runtime->buffer_size) {
670                 newbuf = krealloc(runtime->buffer, params->buffer_size,
671                                   GFP_KERNEL);
672                 if (!newbuf)
673                         return -ENOMEM;
674                 runtime->buffer = newbuf;
675                 runtime->buffer_size = params->buffer_size;
676         }
677         runtime->avail_min = params->avail_min;
678         return 0;
679 }
680 EXPORT_SYMBOL(snd_rawmidi_input_params);
681
682 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
683                                      struct snd_rawmidi_status * status)
684 {
685         struct snd_rawmidi_runtime *runtime = substream->runtime;
686
687         memset(status, 0, sizeof(*status));
688         status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
689         spin_lock_irq(&runtime->lock);
690         status->avail = runtime->avail;
691         spin_unlock_irq(&runtime->lock);
692         return 0;
693 }
694
695 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
696                                     struct snd_rawmidi_status * status)
697 {
698         struct snd_rawmidi_runtime *runtime = substream->runtime;
699
700         memset(status, 0, sizeof(*status));
701         status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
702         spin_lock_irq(&runtime->lock);
703         status->avail = runtime->avail;
704         status->xruns = runtime->xruns;
705         runtime->xruns = 0;
706         spin_unlock_irq(&runtime->lock);
707         return 0;
708 }
709
710 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
711 {
712         struct snd_rawmidi_file *rfile;
713         void __user *argp = (void __user *)arg;
714
715         rfile = file->private_data;
716         if (((cmd >> 8) & 0xff) != 'W')
717                 return -ENOTTY;
718         switch (cmd) {
719         case SNDRV_RAWMIDI_IOCTL_PVERSION:
720                 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
721         case SNDRV_RAWMIDI_IOCTL_INFO:
722         {
723                 int stream;
724                 struct snd_rawmidi_info __user *info = argp;
725                 if (get_user(stream, &info->stream))
726                         return -EFAULT;
727                 switch (stream) {
728                 case SNDRV_RAWMIDI_STREAM_INPUT:
729                         return snd_rawmidi_info_user(rfile->input, info);
730                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731                         return snd_rawmidi_info_user(rfile->output, info);
732                 default:
733                         return -EINVAL;
734                 }
735         }
736         case SNDRV_RAWMIDI_IOCTL_PARAMS:
737         {
738                 struct snd_rawmidi_params params;
739                 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
740                         return -EFAULT;
741                 switch (params.stream) {
742                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
743                         if (rfile->output == NULL)
744                                 return -EINVAL;
745                         return snd_rawmidi_output_params(rfile->output, &params);
746                 case SNDRV_RAWMIDI_STREAM_INPUT:
747                         if (rfile->input == NULL)
748                                 return -EINVAL;
749                         return snd_rawmidi_input_params(rfile->input, &params);
750                 default:
751                         return -EINVAL;
752                 }
753         }
754         case SNDRV_RAWMIDI_IOCTL_STATUS:
755         {
756                 int err = 0;
757                 struct snd_rawmidi_status status;
758                 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
759                         return -EFAULT;
760                 switch (status.stream) {
761                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
762                         if (rfile->output == NULL)
763                                 return -EINVAL;
764                         err = snd_rawmidi_output_status(rfile->output, &status);
765                         break;
766                 case SNDRV_RAWMIDI_STREAM_INPUT:
767                         if (rfile->input == NULL)
768                                 return -EINVAL;
769                         err = snd_rawmidi_input_status(rfile->input, &status);
770                         break;
771                 default:
772                         return -EINVAL;
773                 }
774                 if (err < 0)
775                         return err;
776                 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
777                         return -EFAULT;
778                 return 0;
779         }
780         case SNDRV_RAWMIDI_IOCTL_DROP:
781         {
782                 int val;
783                 if (get_user(val, (int __user *) argp))
784                         return -EFAULT;
785                 switch (val) {
786                 case SNDRV_RAWMIDI_STREAM_OUTPUT:
787                         if (rfile->output == NULL)
788                                 return -EINVAL;
789                         return snd_rawmidi_drop_output(rfile->output);
790                 default:
791                         return -EINVAL;
792                 }
793         }
794         case SNDRV_RAWMIDI_IOCTL_DRAIN:
795         {
796                 int val;
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_drain_output(rfile->output);
804                 case SNDRV_RAWMIDI_STREAM_INPUT:
805                         if (rfile->input == NULL)
806                                 return -EINVAL;
807                         return snd_rawmidi_drain_input(rfile->input);
808                 default:
809                         return -EINVAL;
810                 }
811         }
812         default:
813                 rmidi_dbg(rfile->rmidi,
814                           "rawmidi: unknown command = 0x%x\n", cmd);
815         }
816         return -ENOTTY;
817 }
818
819 static int snd_rawmidi_control_ioctl(struct snd_card *card,
820                                      struct snd_ctl_file *control,
821                                      unsigned int cmd,
822                                      unsigned long arg)
823 {
824         void __user *argp = (void __user *)arg;
825
826         switch (cmd) {
827         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
828         {
829                 int device;
830                 
831                 if (get_user(device, (int __user *)argp))
832                         return -EFAULT;
833                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
834                         device = SNDRV_RAWMIDI_DEVICES - 1;
835                 mutex_lock(&register_mutex);
836                 device = device < 0 ? 0 : device + 1;
837                 while (device < SNDRV_RAWMIDI_DEVICES) {
838                         if (snd_rawmidi_search(card, device))
839                                 break;
840                         device++;
841                 }
842                 if (device == SNDRV_RAWMIDI_DEVICES)
843                         device = -1;
844                 mutex_unlock(&register_mutex);
845                 if (put_user(device, (int __user *)argp))
846                         return -EFAULT;
847                 return 0;
848         }
849         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
850         {
851                 int val;
852                 
853                 if (get_user(val, (int __user *)argp))
854                         return -EFAULT;
855                 control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
856                 return 0;
857         }
858         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
859                 return snd_rawmidi_info_select_user(card, argp);
860         }
861         return -ENOIOCTLCMD;
862 }
863
864 /**
865  * snd_rawmidi_receive - receive the input data from the device
866  * @substream: the rawmidi substream
867  * @buffer: the buffer pointer
868  * @count: the data size to read
869  *
870  * Reads the data from the internal buffer.
871  *
872  * Return: The size of read data, or a negative error code on failure.
873  */
874 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
875                         const unsigned char *buffer, int count)
876 {
877         unsigned long flags;
878         int result = 0, count1;
879         struct snd_rawmidi_runtime *runtime = substream->runtime;
880
881         if (!substream->opened)
882                 return -EBADFD;
883         if (runtime->buffer == NULL) {
884                 rmidi_dbg(substream->rmidi,
885                           "snd_rawmidi_receive: input is not active!!!\n");
886                 return -EINVAL;
887         }
888         spin_lock_irqsave(&runtime->lock, flags);
889         if (count == 1) {       /* special case, faster code */
890                 substream->bytes++;
891                 if (runtime->avail < runtime->buffer_size) {
892                         runtime->buffer[runtime->hw_ptr++] = buffer[0];
893                         runtime->hw_ptr %= runtime->buffer_size;
894                         runtime->avail++;
895                         result++;
896                 } else {
897                         runtime->xruns++;
898                 }
899         } else {
900                 substream->bytes += count;
901                 count1 = runtime->buffer_size - runtime->hw_ptr;
902                 if (count1 > count)
903                         count1 = count;
904                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
905                         count1 = runtime->buffer_size - runtime->avail;
906                 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
907                 runtime->hw_ptr += count1;
908                 runtime->hw_ptr %= runtime->buffer_size;
909                 runtime->avail += count1;
910                 count -= count1;
911                 result += count1;
912                 if (count > 0) {
913                         buffer += count1;
914                         count1 = count;
915                         if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
916                                 count1 = runtime->buffer_size - runtime->avail;
917                                 runtime->xruns += count - count1;
918                         }
919                         if (count1 > 0) {
920                                 memcpy(runtime->buffer, buffer, count1);
921                                 runtime->hw_ptr = count1;
922                                 runtime->avail += count1;
923                                 result += count1;
924                         }
925                 }
926         }
927         if (result > 0) {
928                 if (runtime->event)
929                         schedule_work(&runtime->event_work);
930                 else if (snd_rawmidi_ready(substream))
931                         wake_up(&runtime->sleep);
932         }
933         spin_unlock_irqrestore(&runtime->lock, flags);
934         return result;
935 }
936 EXPORT_SYMBOL(snd_rawmidi_receive);
937
938 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
939                                      unsigned char __user *userbuf,
940                                      unsigned char *kernelbuf, long count)
941 {
942         unsigned long flags;
943         long result = 0, count1;
944         struct snd_rawmidi_runtime *runtime = substream->runtime;
945         unsigned long appl_ptr;
946
947         spin_lock_irqsave(&runtime->lock, flags);
948         while (count > 0 && runtime->avail) {
949                 count1 = runtime->buffer_size - runtime->appl_ptr;
950                 if (count1 > count)
951                         count1 = count;
952                 if (count1 > (int)runtime->avail)
953                         count1 = runtime->avail;
954
955                 /* update runtime->appl_ptr before unlocking for userbuf */
956                 appl_ptr = runtime->appl_ptr;
957                 runtime->appl_ptr += count1;
958                 runtime->appl_ptr %= runtime->buffer_size;
959                 runtime->avail -= count1;
960
961                 if (kernelbuf)
962                         memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
963                 if (userbuf) {
964                         spin_unlock_irqrestore(&runtime->lock, flags);
965                         if (copy_to_user(userbuf + result,
966                                          runtime->buffer + appl_ptr, count1)) {
967                                 return result > 0 ? result : -EFAULT;
968                         }
969                         spin_lock_irqsave(&runtime->lock, flags);
970                 }
971                 result += count1;
972                 count -= count1;
973         }
974         spin_unlock_irqrestore(&runtime->lock, flags);
975         return result;
976 }
977
978 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
979                              unsigned char *buf, long count)
980 {
981         snd_rawmidi_input_trigger(substream, 1);
982         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
983 }
984 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
985
986 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
987                                 loff_t *offset)
988 {
989         long result;
990         int count1;
991         struct snd_rawmidi_file *rfile;
992         struct snd_rawmidi_substream *substream;
993         struct snd_rawmidi_runtime *runtime;
994
995         rfile = file->private_data;
996         substream = rfile->input;
997         if (substream == NULL)
998                 return -EIO;
999         runtime = substream->runtime;
1000         snd_rawmidi_input_trigger(substream, 1);
1001         result = 0;
1002         while (count > 0) {
1003                 spin_lock_irq(&runtime->lock);
1004                 while (!snd_rawmidi_ready(substream)) {
1005                         wait_queue_entry_t wait;
1006                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1007                                 spin_unlock_irq(&runtime->lock);
1008                                 return result > 0 ? result : -EAGAIN;
1009                         }
1010                         init_waitqueue_entry(&wait, current);
1011                         add_wait_queue(&runtime->sleep, &wait);
1012                         set_current_state(TASK_INTERRUPTIBLE);
1013                         spin_unlock_irq(&runtime->lock);
1014                         schedule();
1015                         remove_wait_queue(&runtime->sleep, &wait);
1016                         if (rfile->rmidi->card->shutdown)
1017                                 return -ENODEV;
1018                         if (signal_pending(current))
1019                                 return result > 0 ? result : -ERESTARTSYS;
1020                         if (!runtime->avail)
1021                                 return result > 0 ? result : -EIO;
1022                         spin_lock_irq(&runtime->lock);
1023                 }
1024                 spin_unlock_irq(&runtime->lock);
1025                 count1 = snd_rawmidi_kernel_read1(substream,
1026                                                   (unsigned char __user *)buf,
1027                                                   NULL/*kernelbuf*/,
1028                                                   count);
1029                 if (count1 < 0)
1030                         return result > 0 ? result : count1;
1031                 result += count1;
1032                 buf += count1;
1033                 count -= count1;
1034         }
1035         return result;
1036 }
1037
1038 /**
1039  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1040  * @substream: the rawmidi substream
1041  *
1042  * Return: 1 if the internal output buffer is empty, 0 if not.
1043  */
1044 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1045 {
1046         struct snd_rawmidi_runtime *runtime = substream->runtime;
1047         int result;
1048         unsigned long flags;
1049
1050         if (runtime->buffer == NULL) {
1051                 rmidi_dbg(substream->rmidi,
1052                           "snd_rawmidi_transmit_empty: output is not active!!!\n");
1053                 return 1;
1054         }
1055         spin_lock_irqsave(&runtime->lock, flags);
1056         result = runtime->avail >= runtime->buffer_size;
1057         spin_unlock_irqrestore(&runtime->lock, flags);
1058         return result;          
1059 }
1060 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1061
1062 /**
1063  * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1064  * @substream: the rawmidi substream
1065  * @buffer: the buffer pointer
1066  * @count: data size to transfer
1067  *
1068  * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
1069  */
1070 int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1071                               unsigned char *buffer, int count)
1072 {
1073         int result, count1;
1074         struct snd_rawmidi_runtime *runtime = substream->runtime;
1075
1076         if (runtime->buffer == NULL) {
1077                 rmidi_dbg(substream->rmidi,
1078                           "snd_rawmidi_transmit_peek: output is not active!!!\n");
1079                 return -EINVAL;
1080         }
1081         result = 0;
1082         if (runtime->avail >= runtime->buffer_size) {
1083                 /* warning: lowlevel layer MUST trigger down the hardware */
1084                 goto __skip;
1085         }
1086         if (count == 1) {       /* special case, faster code */
1087                 *buffer = runtime->buffer[runtime->hw_ptr];
1088                 result++;
1089         } else {
1090                 count1 = runtime->buffer_size - runtime->hw_ptr;
1091                 if (count1 > count)
1092                         count1 = count;
1093                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1094                         count1 = runtime->buffer_size - runtime->avail;
1095                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1096                 count -= count1;
1097                 result += count1;
1098                 if (count > 0) {
1099                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1100                                 count = runtime->buffer_size - runtime->avail - count1;
1101                         memcpy(buffer + count1, runtime->buffer, count);
1102                         result += count;
1103                 }
1104         }
1105       __skip:
1106         return result;
1107 }
1108 EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1109
1110 /**
1111  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1112  * @substream: the rawmidi substream
1113  * @buffer: the buffer pointer
1114  * @count: data size to transfer
1115  *
1116  * Copies data from the internal output buffer to the given buffer.
1117  *
1118  * Call this in the interrupt handler when the midi output is ready,
1119  * and call snd_rawmidi_transmit_ack() after the transmission is
1120  * finished.
1121  *
1122  * Return: The size of copied data, or a negative error code on failure.
1123  */
1124 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1125                               unsigned char *buffer, int count)
1126 {
1127         struct snd_rawmidi_runtime *runtime = substream->runtime;
1128         int result;
1129         unsigned long flags;
1130
1131         spin_lock_irqsave(&runtime->lock, flags);
1132         result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1133         spin_unlock_irqrestore(&runtime->lock, flags);
1134         return result;
1135 }
1136 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1137
1138 /**
1139  * __snd_rawmidi_transmit_ack - acknowledge the transmission
1140  * @substream: the rawmidi substream
1141  * @count: the transferred count
1142  *
1143  * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1144  */
1145 int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1146 {
1147         struct snd_rawmidi_runtime *runtime = substream->runtime;
1148
1149         if (runtime->buffer == NULL) {
1150                 rmidi_dbg(substream->rmidi,
1151                           "snd_rawmidi_transmit_ack: output is not active!!!\n");
1152                 return -EINVAL;
1153         }
1154         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1155         runtime->hw_ptr += count;
1156         runtime->hw_ptr %= runtime->buffer_size;
1157         runtime->avail += count;
1158         substream->bytes += count;
1159         if (count > 0) {
1160                 if (runtime->drain || snd_rawmidi_ready(substream))
1161                         wake_up(&runtime->sleep);
1162         }
1163         return count;
1164 }
1165 EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1166
1167 /**
1168  * snd_rawmidi_transmit_ack - acknowledge the transmission
1169  * @substream: the rawmidi substream
1170  * @count: the transferred count
1171  *
1172  * Advances the hardware pointer for the internal output buffer with
1173  * the given size and updates the condition.
1174  * Call after the transmission is finished.
1175  *
1176  * Return: The advanced size if successful, or a negative error code on failure.
1177  */
1178 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1179 {
1180         struct snd_rawmidi_runtime *runtime = substream->runtime;
1181         int result;
1182         unsigned long flags;
1183
1184         spin_lock_irqsave(&runtime->lock, flags);
1185         result = __snd_rawmidi_transmit_ack(substream, count);
1186         spin_unlock_irqrestore(&runtime->lock, flags);
1187         return result;
1188 }
1189 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1190
1191 /**
1192  * snd_rawmidi_transmit - copy from the buffer to the device
1193  * @substream: the rawmidi substream
1194  * @buffer: the buffer pointer
1195  * @count: the data size to transfer
1196  * 
1197  * Copies data from the buffer to the device and advances the pointer.
1198  *
1199  * Return: The copied size if successful, or a negative error code on failure.
1200  */
1201 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1202                          unsigned char *buffer, int count)
1203 {
1204         struct snd_rawmidi_runtime *runtime = substream->runtime;
1205         int result;
1206         unsigned long flags;
1207
1208         spin_lock_irqsave(&runtime->lock, flags);
1209         if (!substream->opened)
1210                 result = -EBADFD;
1211         else {
1212                 count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1213                 if (count <= 0)
1214                         result = count;
1215                 else
1216                         result = __snd_rawmidi_transmit_ack(substream, count);
1217         }
1218         spin_unlock_irqrestore(&runtime->lock, flags);
1219         return result;
1220 }
1221 EXPORT_SYMBOL(snd_rawmidi_transmit);
1222
1223 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1224                                       const unsigned char __user *userbuf,
1225                                       const unsigned char *kernelbuf,
1226                                       long count)
1227 {
1228         unsigned long flags;
1229         long count1, result;
1230         struct snd_rawmidi_runtime *runtime = substream->runtime;
1231         unsigned long appl_ptr;
1232
1233         if (!kernelbuf && !userbuf)
1234                 return -EINVAL;
1235         if (snd_BUG_ON(!runtime->buffer))
1236                 return -EINVAL;
1237
1238         result = 0;
1239         spin_lock_irqsave(&runtime->lock, flags);
1240         if (substream->append) {
1241                 if ((long)runtime->avail < count) {
1242                         spin_unlock_irqrestore(&runtime->lock, flags);
1243                         return -EAGAIN;
1244                 }
1245         }
1246         while (count > 0 && runtime->avail > 0) {
1247                 count1 = runtime->buffer_size - runtime->appl_ptr;
1248                 if (count1 > count)
1249                         count1 = count;
1250                 if (count1 > (long)runtime->avail)
1251                         count1 = runtime->avail;
1252
1253                 /* update runtime->appl_ptr before unlocking for userbuf */
1254                 appl_ptr = runtime->appl_ptr;
1255                 runtime->appl_ptr += count1;
1256                 runtime->appl_ptr %= runtime->buffer_size;
1257                 runtime->avail -= count1;
1258
1259                 if (kernelbuf)
1260                         memcpy(runtime->buffer + appl_ptr,
1261                                kernelbuf + result, count1);
1262                 else if (userbuf) {
1263                         spin_unlock_irqrestore(&runtime->lock, flags);
1264                         if (copy_from_user(runtime->buffer + appl_ptr,
1265                                            userbuf + result, count1)) {
1266                                 spin_lock_irqsave(&runtime->lock, flags);
1267                                 result = result > 0 ? result : -EFAULT;
1268                                 goto __end;
1269                         }
1270                         spin_lock_irqsave(&runtime->lock, flags);
1271                 }
1272                 result += count1;
1273                 count -= count1;
1274         }
1275       __end:
1276         count1 = runtime->avail < runtime->buffer_size;
1277         spin_unlock_irqrestore(&runtime->lock, flags);
1278         if (count1)
1279                 snd_rawmidi_output_trigger(substream, 1);
1280         return result;
1281 }
1282
1283 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1284                               const unsigned char *buf, long count)
1285 {
1286         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1287 }
1288 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1289
1290 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1291                                  size_t count, loff_t *offset)
1292 {
1293         long result, timeout;
1294         int count1;
1295         struct snd_rawmidi_file *rfile;
1296         struct snd_rawmidi_runtime *runtime;
1297         struct snd_rawmidi_substream *substream;
1298
1299         rfile = file->private_data;
1300         substream = rfile->output;
1301         runtime = substream->runtime;
1302         /* we cannot put an atomic message to our buffer */
1303         if (substream->append && count > runtime->buffer_size)
1304                 return -EIO;
1305         result = 0;
1306         while (count > 0) {
1307                 spin_lock_irq(&runtime->lock);
1308                 while (!snd_rawmidi_ready_append(substream, count)) {
1309                         wait_queue_entry_t wait;
1310                         if (file->f_flags & O_NONBLOCK) {
1311                                 spin_unlock_irq(&runtime->lock);
1312                                 return result > 0 ? result : -EAGAIN;
1313                         }
1314                         init_waitqueue_entry(&wait, current);
1315                         add_wait_queue(&runtime->sleep, &wait);
1316                         set_current_state(TASK_INTERRUPTIBLE);
1317                         spin_unlock_irq(&runtime->lock);
1318                         timeout = schedule_timeout(30 * HZ);
1319                         remove_wait_queue(&runtime->sleep, &wait);
1320                         if (rfile->rmidi->card->shutdown)
1321                                 return -ENODEV;
1322                         if (signal_pending(current))
1323                                 return result > 0 ? result : -ERESTARTSYS;
1324                         if (!runtime->avail && !timeout)
1325                                 return result > 0 ? result : -EIO;
1326                         spin_lock_irq(&runtime->lock);
1327                 }
1328                 spin_unlock_irq(&runtime->lock);
1329                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1330                 if (count1 < 0)
1331                         return result > 0 ? result : count1;
1332                 result += count1;
1333                 buf += count1;
1334                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1335                         break;
1336                 count -= count1;
1337         }
1338         if (file->f_flags & O_DSYNC) {
1339                 spin_lock_irq(&runtime->lock);
1340                 while (runtime->avail != runtime->buffer_size) {
1341                         wait_queue_entry_t wait;
1342                         unsigned int last_avail = runtime->avail;
1343                         init_waitqueue_entry(&wait, current);
1344                         add_wait_queue(&runtime->sleep, &wait);
1345                         set_current_state(TASK_INTERRUPTIBLE);
1346                         spin_unlock_irq(&runtime->lock);
1347                         timeout = schedule_timeout(30 * HZ);
1348                         remove_wait_queue(&runtime->sleep, &wait);
1349                         if (signal_pending(current))
1350                                 return result > 0 ? result : -ERESTARTSYS;
1351                         if (runtime->avail == last_avail && !timeout)
1352                                 return result > 0 ? result : -EIO;
1353                         spin_lock_irq(&runtime->lock);
1354                 }
1355                 spin_unlock_irq(&runtime->lock);
1356         }
1357         return result;
1358 }
1359
1360 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1361 {
1362         struct snd_rawmidi_file *rfile;
1363         struct snd_rawmidi_runtime *runtime;
1364         unsigned int mask;
1365
1366         rfile = file->private_data;
1367         if (rfile->input != NULL) {
1368                 runtime = rfile->input->runtime;
1369                 snd_rawmidi_input_trigger(rfile->input, 1);
1370                 poll_wait(file, &runtime->sleep, wait);
1371         }
1372         if (rfile->output != NULL) {
1373                 runtime = rfile->output->runtime;
1374                 poll_wait(file, &runtime->sleep, wait);
1375         }
1376         mask = 0;
1377         if (rfile->input != NULL) {
1378                 if (snd_rawmidi_ready(rfile->input))
1379                         mask |= POLLIN | POLLRDNORM;
1380         }
1381         if (rfile->output != NULL) {
1382                 if (snd_rawmidi_ready(rfile->output))
1383                         mask |= POLLOUT | POLLWRNORM;
1384         }
1385         return mask;
1386 }
1387
1388 /*
1389  */
1390 #ifdef CONFIG_COMPAT
1391 #include "rawmidi_compat.c"
1392 #else
1393 #define snd_rawmidi_ioctl_compat        NULL
1394 #endif
1395
1396 /*
1397
1398  */
1399
1400 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1401                                        struct snd_info_buffer *buffer)
1402 {
1403         struct snd_rawmidi *rmidi;
1404         struct snd_rawmidi_substream *substream;
1405         struct snd_rawmidi_runtime *runtime;
1406
1407         rmidi = entry->private_data;
1408         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1409         mutex_lock(&rmidi->open_mutex);
1410         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1411                 list_for_each_entry(substream,
1412                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1413                                     list) {
1414                         snd_iprintf(buffer,
1415                                     "Output %d\n"
1416                                     "  Tx bytes     : %lu\n",
1417                                     substream->number,
1418                                     (unsigned long) substream->bytes);
1419                         if (substream->opened) {
1420                                 snd_iprintf(buffer,
1421                                     "  Owner PID    : %d\n",
1422                                     pid_vnr(substream->pid));
1423                                 runtime = substream->runtime;
1424                                 snd_iprintf(buffer,
1425                                     "  Mode         : %s\n"
1426                                     "  Buffer size  : %lu\n"
1427                                     "  Avail        : %lu\n",
1428                                     runtime->oss ? "OSS compatible" : "native",
1429                                     (unsigned long) runtime->buffer_size,
1430                                     (unsigned long) runtime->avail);
1431                         }
1432                 }
1433         }
1434         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1435                 list_for_each_entry(substream,
1436                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1437                                     list) {
1438                         snd_iprintf(buffer,
1439                                     "Input %d\n"
1440                                     "  Rx bytes     : %lu\n",
1441                                     substream->number,
1442                                     (unsigned long) substream->bytes);
1443                         if (substream->opened) {
1444                                 snd_iprintf(buffer,
1445                                             "  Owner PID    : %d\n",
1446                                             pid_vnr(substream->pid));
1447                                 runtime = substream->runtime;
1448                                 snd_iprintf(buffer,
1449                                             "  Buffer size  : %lu\n"
1450                                             "  Avail        : %lu\n"
1451                                             "  Overruns     : %lu\n",
1452                                             (unsigned long) runtime->buffer_size,
1453                                             (unsigned long) runtime->avail,
1454                                             (unsigned long) runtime->xruns);
1455                         }
1456                 }
1457         }
1458         mutex_unlock(&rmidi->open_mutex);
1459 }
1460
1461 /*
1462  *  Register functions
1463  */
1464
1465 static const struct file_operations snd_rawmidi_f_ops =
1466 {
1467         .owner =        THIS_MODULE,
1468         .read =         snd_rawmidi_read,
1469         .write =        snd_rawmidi_write,
1470         .open =         snd_rawmidi_open,
1471         .release =      snd_rawmidi_release,
1472         .llseek =       no_llseek,
1473         .poll =         snd_rawmidi_poll,
1474         .unlocked_ioctl =       snd_rawmidi_ioctl,
1475         .compat_ioctl = snd_rawmidi_ioctl_compat,
1476 };
1477
1478 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1479                                         struct snd_rawmidi_str *stream,
1480                                         int direction,
1481                                         int count)
1482 {
1483         struct snd_rawmidi_substream *substream;
1484         int idx;
1485
1486         for (idx = 0; idx < count; idx++) {
1487                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1488                 if (!substream)
1489                         return -ENOMEM;
1490                 substream->stream = direction;
1491                 substream->number = idx;
1492                 substream->rmidi = rmidi;
1493                 substream->pstr = stream;
1494                 list_add_tail(&substream->list, &stream->substreams);
1495                 stream->substream_count++;
1496         }
1497         return 0;
1498 }
1499
1500 static void release_rawmidi_device(struct device *dev)
1501 {
1502         kfree(container_of(dev, struct snd_rawmidi, dev));
1503 }
1504
1505 /**
1506  * snd_rawmidi_new - create a rawmidi instance
1507  * @card: the card instance
1508  * @id: the id string
1509  * @device: the device index
1510  * @output_count: the number of output streams
1511  * @input_count: the number of input streams
1512  * @rrawmidi: the pointer to store the new rawmidi instance
1513  *
1514  * Creates a new rawmidi instance.
1515  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1516  *
1517  * Return: Zero if successful, or a negative error code on failure.
1518  */
1519 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1520                     int output_count, int input_count,
1521                     struct snd_rawmidi ** rrawmidi)
1522 {
1523         struct snd_rawmidi *rmidi;
1524         int err;
1525         static struct snd_device_ops ops = {
1526                 .dev_free = snd_rawmidi_dev_free,
1527                 .dev_register = snd_rawmidi_dev_register,
1528                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1529         };
1530
1531         if (snd_BUG_ON(!card))
1532                 return -ENXIO;
1533         if (rrawmidi)
1534                 *rrawmidi = NULL;
1535         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1536         if (!rmidi)
1537                 return -ENOMEM;
1538         rmidi->card = card;
1539         rmidi->device = device;
1540         mutex_init(&rmidi->open_mutex);
1541         init_waitqueue_head(&rmidi->open_wait);
1542         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1543         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1544
1545         if (id != NULL)
1546                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1547
1548         snd_device_initialize(&rmidi->dev, card);
1549         rmidi->dev.release = release_rawmidi_device;
1550         dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1551
1552         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1553                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1554                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1555                                                 input_count)) < 0) {
1556                 snd_rawmidi_free(rmidi);
1557                 return err;
1558         }
1559         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1560                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1561                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1562                                                 output_count)) < 0) {
1563                 snd_rawmidi_free(rmidi);
1564                 return err;
1565         }
1566         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1567                 snd_rawmidi_free(rmidi);
1568                 return err;
1569         }
1570         if (rrawmidi)
1571                 *rrawmidi = rmidi;
1572         return 0;
1573 }
1574 EXPORT_SYMBOL(snd_rawmidi_new);
1575
1576 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1577 {
1578         struct snd_rawmidi_substream *substream;
1579
1580         while (!list_empty(&stream->substreams)) {
1581                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1582                 list_del(&substream->list);
1583                 kfree(substream);
1584         }
1585 }
1586
1587 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1588 {
1589         if (!rmidi)
1590                 return 0;
1591
1592         snd_info_free_entry(rmidi->proc_entry);
1593         rmidi->proc_entry = NULL;
1594         mutex_lock(&register_mutex);
1595         if (rmidi->ops && rmidi->ops->dev_unregister)
1596                 rmidi->ops->dev_unregister(rmidi);
1597         mutex_unlock(&register_mutex);
1598
1599         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1600         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1601         if (rmidi->private_free)
1602                 rmidi->private_free(rmidi);
1603         put_device(&rmidi->dev);
1604         return 0;
1605 }
1606
1607 static int snd_rawmidi_dev_free(struct snd_device *device)
1608 {
1609         struct snd_rawmidi *rmidi = device->device_data;
1610         return snd_rawmidi_free(rmidi);
1611 }
1612
1613 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1614 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1615 {
1616         struct snd_rawmidi *rmidi = device->private_data;
1617         rmidi->seq_dev = NULL;
1618 }
1619 #endif
1620
1621 static int snd_rawmidi_dev_register(struct snd_device *device)
1622 {
1623         int err;
1624         struct snd_info_entry *entry;
1625         char name[16];
1626         struct snd_rawmidi *rmidi = device->device_data;
1627
1628         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1629                 return -ENOMEM;
1630         mutex_lock(&register_mutex);
1631         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1632                 mutex_unlock(&register_mutex);
1633                 return -EBUSY;
1634         }
1635         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1636         mutex_unlock(&register_mutex);
1637         err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1638                                   rmidi->card, rmidi->device,
1639                                   &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1640         if (err < 0) {
1641                 rmidi_err(rmidi, "unable to register\n");
1642                 mutex_lock(&register_mutex);
1643                 list_del(&rmidi->list);
1644                 mutex_unlock(&register_mutex);
1645                 return err;
1646         }
1647         if (rmidi->ops && rmidi->ops->dev_register &&
1648             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1649                 snd_unregister_device(&rmidi->dev);
1650                 mutex_lock(&register_mutex);
1651                 list_del(&rmidi->list);
1652                 mutex_unlock(&register_mutex);
1653                 return err;
1654         }
1655 #ifdef CONFIG_SND_OSSEMUL
1656         rmidi->ossreg = 0;
1657         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1658                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1659                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1660                                             rmidi) < 0) {
1661                         rmidi_err(rmidi,
1662                                   "unable to register OSS rawmidi device %i:%i\n",
1663                                   rmidi->card->number, 0);
1664                 } else {
1665                         rmidi->ossreg++;
1666 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1667                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1668 #endif
1669                 }
1670         }
1671         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1672                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1673                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1674                                             rmidi) < 0) {
1675                         rmidi_err(rmidi,
1676                                   "unable to register OSS rawmidi device %i:%i\n",
1677                                   rmidi->card->number, 1);
1678                 } else {
1679                         rmidi->ossreg++;
1680                 }
1681         }
1682 #endif /* CONFIG_SND_OSSEMUL */
1683         sprintf(name, "midi%d", rmidi->device);
1684         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1685         if (entry) {
1686                 entry->private_data = rmidi;
1687                 entry->c.text.read = snd_rawmidi_proc_info_read;
1688                 if (snd_info_register(entry) < 0) {
1689                         snd_info_free_entry(entry);
1690                         entry = NULL;
1691                 }
1692         }
1693         rmidi->proc_entry = entry;
1694 #if IS_ENABLED(CONFIG_SND_SEQUENCER)
1695         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1696                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1697                         rmidi->seq_dev->private_data = rmidi;
1698                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1699                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1700                         snd_device_register(rmidi->card, rmidi->seq_dev);
1701                 }
1702         }
1703 #endif
1704         return 0;
1705 }
1706
1707 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1708 {
1709         struct snd_rawmidi *rmidi = device->device_data;
1710         int dir;
1711
1712         mutex_lock(&register_mutex);
1713         mutex_lock(&rmidi->open_mutex);
1714         wake_up(&rmidi->open_wait);
1715         list_del_init(&rmidi->list);
1716         for (dir = 0; dir < 2; dir++) {
1717                 struct snd_rawmidi_substream *s;
1718                 list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1719                         if (s->runtime)
1720                                 wake_up(&s->runtime->sleep);
1721                 }
1722         }
1723
1724 #ifdef CONFIG_SND_OSSEMUL
1725         if (rmidi->ossreg) {
1726                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1727                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1728 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1729                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1730 #endif
1731                 }
1732                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1733                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1734                 rmidi->ossreg = 0;
1735         }
1736 #endif /* CONFIG_SND_OSSEMUL */
1737         snd_unregister_device(&rmidi->dev);
1738         mutex_unlock(&rmidi->open_mutex);
1739         mutex_unlock(&register_mutex);
1740         return 0;
1741 }
1742
1743 /**
1744  * snd_rawmidi_set_ops - set the rawmidi operators
1745  * @rmidi: the rawmidi instance
1746  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1747  * @ops: the operator table
1748  *
1749  * Sets the rawmidi operators for the given stream direction.
1750  */
1751 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1752                          const struct snd_rawmidi_ops *ops)
1753 {
1754         struct snd_rawmidi_substream *substream;
1755         
1756         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1757                 substream->ops = ops;
1758 }
1759 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1760
1761 /*
1762  *  ENTRY functions
1763  */
1764
1765 static int __init alsa_rawmidi_init(void)
1766 {
1767
1768         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1769         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1770 #ifdef CONFIG_SND_OSSEMUL
1771         { int i;
1772         /* check device map table */
1773         for (i = 0; i < SNDRV_CARDS; i++) {
1774                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1775                         pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1776                                i, midi_map[i]);
1777                         midi_map[i] = 0;
1778                 }
1779                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1780                         pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1781                                i, amidi_map[i]);
1782                         amidi_map[i] = 1;
1783                 }
1784         }
1785         }
1786 #endif /* CONFIG_SND_OSSEMUL */
1787         return 0;
1788 }
1789
1790 static void __exit alsa_rawmidi_exit(void)
1791 {
1792         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1793         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1794 }
1795
1796 module_init(alsa_rawmidi_init)
1797 module_exit(alsa_rawmidi_exit)