ALSA: sound, core, pcm_lib: fix xrun_log
[linux-2.6.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.h>
26 #include <linux/slab.h>
27 #include <linux/time.h>
28 #include <linux/wait.h>
29 #include <linux/mutex.h>
30 #include <linux/moduleparam.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 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
60 {
61         struct snd_rawmidi *rawmidi;
62
63         list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
64                 if (rawmidi->card == card && rawmidi->device == device)
65                         return rawmidi;
66         return NULL;
67 }
68
69 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
70 {
71         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
72         case FMODE_WRITE:
73                 return SNDRV_RAWMIDI_LFLG_OUTPUT;
74         case FMODE_READ:
75                 return SNDRV_RAWMIDI_LFLG_INPUT;
76         default:
77                 return SNDRV_RAWMIDI_LFLG_OPEN;
78         }
79 }
80
81 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
82 {
83         struct snd_rawmidi_runtime *runtime = substream->runtime;
84         return runtime->avail >= runtime->avail_min;
85 }
86
87 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
88                                            size_t count)
89 {
90         struct snd_rawmidi_runtime *runtime = substream->runtime;
91         return runtime->avail >= runtime->avail_min &&
92                (!substream->append || runtime->avail >= count);
93 }
94
95 static void snd_rawmidi_input_event_tasklet(unsigned long data)
96 {
97         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
98         substream->runtime->event(substream);
99 }
100
101 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
102 {
103         struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
104         substream->ops->trigger(substream, 1);
105 }
106
107 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
108 {
109         struct snd_rawmidi_runtime *runtime;
110
111         if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
112                 return -ENOMEM;
113         spin_lock_init(&runtime->lock);
114         init_waitqueue_head(&runtime->sleep);
115         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
116                 tasklet_init(&runtime->tasklet,
117                              snd_rawmidi_input_event_tasklet,
118                              (unsigned long)substream);
119         else
120                 tasklet_init(&runtime->tasklet,
121                              snd_rawmidi_output_trigger_tasklet,
122                              (unsigned long)substream);
123         runtime->event = NULL;
124         runtime->buffer_size = PAGE_SIZE;
125         runtime->avail_min = 1;
126         if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
127                 runtime->avail = 0;
128         else
129                 runtime->avail = runtime->buffer_size;
130         if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
131                 kfree(runtime);
132                 return -ENOMEM;
133         }
134         runtime->appl_ptr = runtime->hw_ptr = 0;
135         substream->runtime = runtime;
136         return 0;
137 }
138
139 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
140 {
141         struct snd_rawmidi_runtime *runtime = substream->runtime;
142
143         kfree(runtime->buffer);
144         kfree(runtime);
145         substream->runtime = NULL;
146         return 0;
147 }
148
149 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
150 {
151         if (!substream->opened)
152                 return;
153         if (up) {
154                 tasklet_schedule(&substream->runtime->tasklet);
155         } else {
156                 tasklet_kill(&substream->runtime->tasklet);
157                 substream->ops->trigger(substream, 0);
158         }
159 }
160
161 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
162 {
163         if (!substream->opened)
164                 return;
165         substream->ops->trigger(substream, up);
166         if (!up && substream->runtime->event)
167                 tasklet_kill(&substream->runtime->tasklet);
168 }
169
170 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
171 {
172         unsigned long flags;
173         struct snd_rawmidi_runtime *runtime = substream->runtime;
174
175         snd_rawmidi_output_trigger(substream, 0);
176         runtime->drain = 0;
177         spin_lock_irqsave(&runtime->lock, flags);
178         runtime->appl_ptr = runtime->hw_ptr = 0;
179         runtime->avail = runtime->buffer_size;
180         spin_unlock_irqrestore(&runtime->lock, flags);
181         return 0;
182 }
183
184 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
185 {
186         int err;
187         long timeout;
188         struct snd_rawmidi_runtime *runtime = substream->runtime;
189
190         err = 0;
191         runtime->drain = 1;
192         timeout = wait_event_interruptible_timeout(runtime->sleep,
193                                 (runtime->avail >= runtime->buffer_size),
194                                 10*HZ);
195         if (signal_pending(current))
196                 err = -ERESTARTSYS;
197         if (runtime->avail < runtime->buffer_size && !timeout) {
198                 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
199                 err = -EIO;
200         }
201         runtime->drain = 0;
202         if (err != -ERESTARTSYS) {
203                 /* we need wait a while to make sure that Tx FIFOs are empty */
204                 if (substream->ops->drain)
205                         substream->ops->drain(substream);
206                 else
207                         msleep(50);
208                 snd_rawmidi_drop_output(substream);
209         }
210         return err;
211 }
212
213 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
214 {
215         unsigned long flags;
216         struct snd_rawmidi_runtime *runtime = substream->runtime;
217
218         snd_rawmidi_input_trigger(substream, 0);
219         runtime->drain = 0;
220         spin_lock_irqsave(&runtime->lock, flags);
221         runtime->appl_ptr = runtime->hw_ptr = 0;
222         runtime->avail = 0;
223         spin_unlock_irqrestore(&runtime->lock, flags);
224         return 0;
225 }
226
227 /* look for an available substream for the given stream direction;
228  * if a specific subdevice is given, try to assign it
229  */
230 static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
231                             int stream, int mode,
232                             struct snd_rawmidi_substream **sub_ret)
233 {
234         struct snd_rawmidi_substream *substream;
235         struct snd_rawmidi_str *s = &rmidi->streams[stream];
236         static unsigned int info_flags[2] = {
237                 [SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
238                 [SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
239         };
240
241         if (!(rmidi->info_flags & info_flags[stream]))
242                 return -ENXIO;
243         if (subdevice >= 0 && subdevice >= s->substream_count)
244                 return -ENODEV;
245
246         list_for_each_entry(substream, &s->substreams, list) {
247                 if (substream->opened) {
248                         if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
249                             !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
250                             !substream->append)
251                                 continue;
252                 }
253                 if (subdevice < 0 || subdevice == substream->number) {
254                         *sub_ret = substream;
255                         return 0;
256                 }
257         }
258         return -EAGAIN;
259 }
260
261 /* open and do ref-counting for the given substream */
262 static int open_substream(struct snd_rawmidi *rmidi,
263                           struct snd_rawmidi_substream *substream,
264                           int mode)
265 {
266         int err;
267
268         if (substream->use_count == 0) {
269                 err = snd_rawmidi_runtime_create(substream);
270                 if (err < 0)
271                         return err;
272                 err = substream->ops->open(substream);
273                 if (err < 0) {
274                         snd_rawmidi_runtime_free(substream);
275                         return err;
276                 }
277                 substream->opened = 1;
278                 substream->active_sensing = 0;
279                 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
280                         substream->append = 1;
281                 substream->pid = get_pid(task_pid(current));
282                 rmidi->streams[substream->stream].substream_opened++;
283         }
284         substream->use_count++;
285         return 0;
286 }
287
288 static void close_substream(struct snd_rawmidi *rmidi,
289                             struct snd_rawmidi_substream *substream,
290                             int cleanup);
291
292 static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
293                              struct snd_rawmidi_file *rfile)
294 {
295         struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
296         int err;
297
298         rfile->input = rfile->output = NULL;
299         if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
300                 err = assign_substream(rmidi, subdevice,
301                                        SNDRV_RAWMIDI_STREAM_INPUT,
302                                        mode, &sinput);
303                 if (err < 0)
304                         return err;
305         }
306         if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
307                 err = assign_substream(rmidi, subdevice,
308                                        SNDRV_RAWMIDI_STREAM_OUTPUT,
309                                        mode, &soutput);
310                 if (err < 0)
311                         return err;
312         }
313
314         if (sinput) {
315                 err = open_substream(rmidi, sinput, mode);
316                 if (err < 0)
317                         return err;
318         }
319         if (soutput) {
320                 err = open_substream(rmidi, soutput, mode);
321                 if (err < 0) {
322                         if (sinput)
323                                 close_substream(rmidi, sinput, 0);
324                         return err;
325                 }
326         }
327
328         rfile->rmidi = rmidi;
329         rfile->input = sinput;
330         rfile->output = soutput;
331         return 0;
332 }
333
334 /* called from sound/core/seq/seq_midi.c */
335 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
336                             int mode, struct snd_rawmidi_file * rfile)
337 {
338         struct snd_rawmidi *rmidi;
339         int err;
340
341         if (snd_BUG_ON(!rfile))
342                 return -EINVAL;
343
344         mutex_lock(&register_mutex);
345         rmidi = snd_rawmidi_search(card, device);
346         if (rmidi == NULL) {
347                 mutex_unlock(&register_mutex);
348                 return -ENODEV;
349         }
350         if (!try_module_get(rmidi->card->module)) {
351                 mutex_unlock(&register_mutex);
352                 return -ENXIO;
353         }
354         mutex_unlock(&register_mutex);
355
356         mutex_lock(&rmidi->open_mutex);
357         err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
358         mutex_unlock(&rmidi->open_mutex);
359         if (err < 0)
360                 module_put(rmidi->card->module);
361         return err;
362 }
363
364 static int snd_rawmidi_open(struct inode *inode, struct file *file)
365 {
366         int maj = imajor(inode);
367         struct snd_card *card;
368         int subdevice;
369         unsigned short fflags;
370         int err;
371         struct snd_rawmidi *rmidi;
372         struct snd_rawmidi_file *rawmidi_file = NULL;
373         wait_queue_t wait;
374         struct snd_ctl_file *kctl;
375
376         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK)) 
377                 return -EINVAL;         /* invalid combination */
378
379         err = nonseekable_open(inode, file);
380         if (err < 0)
381                 return err;
382
383         if (maj == snd_major) {
384                 rmidi = snd_lookup_minor_data(iminor(inode),
385                                               SNDRV_DEVICE_TYPE_RAWMIDI);
386 #ifdef CONFIG_SND_OSSEMUL
387         } else if (maj == SOUND_MAJOR) {
388                 rmidi = snd_lookup_oss_minor_data(iminor(inode),
389                                                   SNDRV_OSS_DEVICE_TYPE_MIDI);
390 #endif
391         } else
392                 return -ENXIO;
393
394         if (rmidi == NULL)
395                 return -ENODEV;
396
397         if (!try_module_get(rmidi->card->module))
398                 return -ENXIO;
399
400         mutex_lock(&rmidi->open_mutex);
401         card = rmidi->card;
402         err = snd_card_file_add(card, file);
403         if (err < 0)
404                 goto __error_card;
405         fflags = snd_rawmidi_file_flags(file);
406         if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
407                 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
408         rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
409         if (rawmidi_file == NULL) {
410                 err = -ENOMEM;
411                 goto __error;
412         }
413         init_waitqueue_entry(&wait, current);
414         add_wait_queue(&rmidi->open_wait, &wait);
415         while (1) {
416                 subdevice = -1;
417                 read_lock(&card->ctl_files_rwlock);
418                 list_for_each_entry(kctl, &card->ctl_files, list) {
419                         if (kctl->pid == task_pid(current)) {
420                                 subdevice = kctl->prefer_rawmidi_subdevice;
421                                 if (subdevice != -1)
422                                         break;
423                         }
424                 }
425                 read_unlock(&card->ctl_files_rwlock);
426                 err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
427                 if (err >= 0)
428                         break;
429                 if (err == -EAGAIN) {
430                         if (file->f_flags & O_NONBLOCK) {
431                                 err = -EBUSY;
432                                 break;
433                         }
434                 } else
435                         break;
436                 set_current_state(TASK_INTERRUPTIBLE);
437                 mutex_unlock(&rmidi->open_mutex);
438                 schedule();
439                 mutex_lock(&rmidi->open_mutex);
440                 if (signal_pending(current)) {
441                         err = -ERESTARTSYS;
442                         break;
443                 }
444         }
445         remove_wait_queue(&rmidi->open_wait, &wait);
446         if (err < 0) {
447                 kfree(rawmidi_file);
448                 goto __error;
449         }
450 #ifdef CONFIG_SND_OSSEMUL
451         if (rawmidi_file->input && rawmidi_file->input->runtime)
452                 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
453         if (rawmidi_file->output && rawmidi_file->output->runtime)
454                 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
455 #endif
456         file->private_data = rawmidi_file;
457         mutex_unlock(&rmidi->open_mutex);
458         return 0;
459
460  __error:
461         snd_card_file_remove(card, file);
462  __error_card:
463         mutex_unlock(&rmidi->open_mutex);
464         module_put(rmidi->card->module);
465         return err;
466 }
467
468 static void close_substream(struct snd_rawmidi *rmidi,
469                             struct snd_rawmidi_substream *substream,
470                             int cleanup)
471 {
472         if (--substream->use_count)
473                 return;
474
475         if (cleanup) {
476                 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
477                         snd_rawmidi_input_trigger(substream, 0);
478                 else {
479                         if (substream->active_sensing) {
480                                 unsigned char buf = 0xfe;
481                                 /* sending single active sensing message
482                                  * to shut the device up
483                                  */
484                                 snd_rawmidi_kernel_write(substream, &buf, 1);
485                         }
486                         if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
487                                 snd_rawmidi_output_trigger(substream, 0);
488                 }
489         }
490         substream->ops->close(substream);
491         if (substream->runtime->private_free)
492                 substream->runtime->private_free(substream);
493         snd_rawmidi_runtime_free(substream);
494         substream->opened = 0;
495         substream->append = 0;
496         put_pid(substream->pid);
497         substream->pid = NULL;
498         rmidi->streams[substream->stream].substream_opened--;
499 }
500
501 static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
502 {
503         struct snd_rawmidi *rmidi;
504
505         rmidi = rfile->rmidi;
506         mutex_lock(&rmidi->open_mutex);
507         if (rfile->input) {
508                 close_substream(rmidi, rfile->input, 1);
509                 rfile->input = NULL;
510         }
511         if (rfile->output) {
512                 close_substream(rmidi, rfile->output, 1);
513                 rfile->output = NULL;
514         }
515         rfile->rmidi = NULL;
516         mutex_unlock(&rmidi->open_mutex);
517         wake_up(&rmidi->open_wait);
518 }
519
520 /* called from sound/core/seq/seq_midi.c */
521 int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
522 {
523         struct snd_rawmidi *rmidi;
524
525         if (snd_BUG_ON(!rfile))
526                 return -ENXIO;
527         
528         rmidi = rfile->rmidi;
529         rawmidi_release_priv(rfile);
530         module_put(rmidi->card->module);
531         return 0;
532 }
533
534 static int snd_rawmidi_release(struct inode *inode, struct file *file)
535 {
536         struct snd_rawmidi_file *rfile;
537         struct snd_rawmidi *rmidi;
538         struct module *module;
539
540         rfile = file->private_data;
541         rmidi = rfile->rmidi;
542         rawmidi_release_priv(rfile);
543         kfree(rfile);
544         module = rmidi->card->module;
545         snd_card_file_remove(rmidi->card, file);
546         module_put(module);
547         return 0;
548 }
549
550 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
551                             struct snd_rawmidi_info *info)
552 {
553         struct snd_rawmidi *rmidi;
554         
555         if (substream == NULL)
556                 return -ENODEV;
557         rmidi = substream->rmidi;
558         memset(info, 0, sizeof(*info));
559         info->card = rmidi->card->number;
560         info->device = rmidi->device;
561         info->subdevice = substream->number;
562         info->stream = substream->stream;
563         info->flags = rmidi->info_flags;
564         strcpy(info->id, rmidi->id);
565         strcpy(info->name, rmidi->name);
566         strcpy(info->subname, substream->name);
567         info->subdevices_count = substream->pstr->substream_count;
568         info->subdevices_avail = (substream->pstr->substream_count -
569                                   substream->pstr->substream_opened);
570         return 0;
571 }
572
573 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
574                                  struct snd_rawmidi_info __user * _info)
575 {
576         struct snd_rawmidi_info info;
577         int err;
578         if ((err = snd_rawmidi_info(substream, &info)) < 0)
579                 return err;
580         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
581                 return -EFAULT;
582         return 0;
583 }
584
585 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
586 {
587         struct snd_rawmidi *rmidi;
588         struct snd_rawmidi_str *pstr;
589         struct snd_rawmidi_substream *substream;
590
591         mutex_lock(&register_mutex);
592         rmidi = snd_rawmidi_search(card, info->device);
593         mutex_unlock(&register_mutex);
594         if (!rmidi)
595                 return -ENXIO;
596         if (info->stream < 0 || info->stream > 1)
597                 return -EINVAL;
598         pstr = &rmidi->streams[info->stream];
599         if (pstr->substream_count == 0)
600                 return -ENOENT;
601         if (info->subdevice >= pstr->substream_count)
602                 return -ENXIO;
603         list_for_each_entry(substream, &pstr->substreams, list) {
604                 if ((unsigned int)substream->number == info->subdevice)
605                         return snd_rawmidi_info(substream, info);
606         }
607         return -ENXIO;
608 }
609
610 static int snd_rawmidi_info_select_user(struct snd_card *card,
611                                         struct snd_rawmidi_info __user *_info)
612 {
613         int err;
614         struct snd_rawmidi_info info;
615         if (get_user(info.device, &_info->device))
616                 return -EFAULT;
617         if (get_user(info.stream, &_info->stream))
618                 return -EFAULT;
619         if (get_user(info.subdevice, &_info->subdevice))
620                 return -EFAULT;
621         if ((err = snd_rawmidi_info_select(card, &info)) < 0)
622                 return err;
623         if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
624                 return -EFAULT;
625         return 0;
626 }
627
628 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
629                               struct snd_rawmidi_params * params)
630 {
631         char *newbuf;
632         struct snd_rawmidi_runtime *runtime = substream->runtime;
633         
634         if (substream->append && substream->use_count > 1)
635                 return -EBUSY;
636         snd_rawmidi_drain_output(substream);
637         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
638                 return -EINVAL;
639         }
640         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
641                 return -EINVAL;
642         }
643         if (params->buffer_size != runtime->buffer_size) {
644                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
645                 if (!newbuf)
646                         return -ENOMEM;
647                 kfree(runtime->buffer);
648                 runtime->buffer = newbuf;
649                 runtime->buffer_size = params->buffer_size;
650                 runtime->avail = runtime->buffer_size;
651         }
652         runtime->avail_min = params->avail_min;
653         substream->active_sensing = !params->no_active_sensing;
654         return 0;
655 }
656
657 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
658                              struct snd_rawmidi_params * params)
659 {
660         char *newbuf;
661         struct snd_rawmidi_runtime *runtime = substream->runtime;
662
663         snd_rawmidi_drain_input(substream);
664         if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
665                 return -EINVAL;
666         }
667         if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
668                 return -EINVAL;
669         }
670         if (params->buffer_size != runtime->buffer_size) {
671                 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
672                 if (!newbuf)
673                         return -ENOMEM;
674                 kfree(runtime->buffer);
675                 runtime->buffer = newbuf;
676                 runtime->buffer_size = params->buffer_size;
677         }
678         runtime->avail_min = params->avail_min;
679         return 0;
680 }
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 #ifdef CONFIG_SND_DEBUG
813         default:
814                 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
815 #endif
816         }
817         return -ENOTTY;
818 }
819
820 static int snd_rawmidi_control_ioctl(struct snd_card *card,
821                                      struct snd_ctl_file *control,
822                                      unsigned int cmd,
823                                      unsigned long arg)
824 {
825         void __user *argp = (void __user *)arg;
826
827         switch (cmd) {
828         case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
829         {
830                 int device;
831                 
832                 if (get_user(device, (int __user *)argp))
833                         return -EFAULT;
834                 if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
835                         device = SNDRV_RAWMIDI_DEVICES - 1;
836                 mutex_lock(&register_mutex);
837                 device = device < 0 ? 0 : device + 1;
838                 while (device < SNDRV_RAWMIDI_DEVICES) {
839                         if (snd_rawmidi_search(card, device))
840                                 break;
841                         device++;
842                 }
843                 if (device == SNDRV_RAWMIDI_DEVICES)
844                         device = -1;
845                 mutex_unlock(&register_mutex);
846                 if (put_user(device, (int __user *)argp))
847                         return -EFAULT;
848                 return 0;
849         }
850         case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
851         {
852                 int val;
853                 
854                 if (get_user(val, (int __user *)argp))
855                         return -EFAULT;
856                 control->prefer_rawmidi_subdevice = val;
857                 return 0;
858         }
859         case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
860                 return snd_rawmidi_info_select_user(card, argp);
861         }
862         return -ENOIOCTLCMD;
863 }
864
865 /**
866  * snd_rawmidi_receive - receive the input data from the device
867  * @substream: the rawmidi substream
868  * @buffer: the buffer pointer
869  * @count: the data size to read
870  *
871  * Reads the data from the internal buffer.
872  *
873  * Returns the size of read data, or a negative error code on failure.
874  */
875 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
876                         const unsigned char *buffer, int count)
877 {
878         unsigned long flags;
879         int result = 0, count1;
880         struct snd_rawmidi_runtime *runtime = substream->runtime;
881
882         if (!substream->opened)
883                 return -EBADFD;
884         if (runtime->buffer == NULL) {
885                 snd_printd("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                         tasklet_schedule(&runtime->tasklet);
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
937 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
938                                      unsigned char __user *userbuf,
939                                      unsigned char *kernelbuf, long count)
940 {
941         unsigned long flags;
942         long result = 0, count1;
943         struct snd_rawmidi_runtime *runtime = substream->runtime;
944
945         while (count > 0 && runtime->avail) {
946                 count1 = runtime->buffer_size - runtime->appl_ptr;
947                 if (count1 > count)
948                         count1 = count;
949                 spin_lock_irqsave(&runtime->lock, flags);
950                 if (count1 > (int)runtime->avail)
951                         count1 = runtime->avail;
952                 if (kernelbuf)
953                         memcpy(kernelbuf + result, runtime->buffer + runtime->appl_ptr, count1);
954                 if (userbuf) {
955                         spin_unlock_irqrestore(&runtime->lock, flags);
956                         if (copy_to_user(userbuf + result,
957                                          runtime->buffer + runtime->appl_ptr, count1)) {
958                                 return result > 0 ? result : -EFAULT;
959                         }
960                         spin_lock_irqsave(&runtime->lock, flags);
961                 }
962                 runtime->appl_ptr += count1;
963                 runtime->appl_ptr %= runtime->buffer_size;
964                 runtime->avail -= count1;
965                 spin_unlock_irqrestore(&runtime->lock, flags);
966                 result += count1;
967                 count -= count1;
968         }
969         return result;
970 }
971
972 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
973                              unsigned char *buf, long count)
974 {
975         snd_rawmidi_input_trigger(substream, 1);
976         return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
977 }
978
979 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
980                                 loff_t *offset)
981 {
982         long result;
983         int count1;
984         struct snd_rawmidi_file *rfile;
985         struct snd_rawmidi_substream *substream;
986         struct snd_rawmidi_runtime *runtime;
987
988         rfile = file->private_data;
989         substream = rfile->input;
990         if (substream == NULL)
991                 return -EIO;
992         runtime = substream->runtime;
993         snd_rawmidi_input_trigger(substream, 1);
994         result = 0;
995         while (count > 0) {
996                 spin_lock_irq(&runtime->lock);
997                 while (!snd_rawmidi_ready(substream)) {
998                         wait_queue_t wait;
999                         if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1000                                 spin_unlock_irq(&runtime->lock);
1001                                 return result > 0 ? result : -EAGAIN;
1002                         }
1003                         init_waitqueue_entry(&wait, current);
1004                         add_wait_queue(&runtime->sleep, &wait);
1005                         set_current_state(TASK_INTERRUPTIBLE);
1006                         spin_unlock_irq(&runtime->lock);
1007                         schedule();
1008                         remove_wait_queue(&runtime->sleep, &wait);
1009                         if (signal_pending(current))
1010                                 return result > 0 ? result : -ERESTARTSYS;
1011                         if (!runtime->avail)
1012                                 return result > 0 ? result : -EIO;
1013                         spin_lock_irq(&runtime->lock);
1014                 }
1015                 spin_unlock_irq(&runtime->lock);
1016                 count1 = snd_rawmidi_kernel_read1(substream,
1017                                                   (unsigned char __user *)buf,
1018                                                   NULL/*kernelbuf*/,
1019                                                   count);
1020                 if (count1 < 0)
1021                         return result > 0 ? result : count1;
1022                 result += count1;
1023                 buf += count1;
1024                 count -= count1;
1025         }
1026         return result;
1027 }
1028
1029 /**
1030  * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1031  * @substream: the rawmidi substream
1032  * 
1033  * Returns 1 if the internal output buffer is empty, 0 if not.
1034  */
1035 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1036 {
1037         struct snd_rawmidi_runtime *runtime = substream->runtime;
1038         int result;
1039         unsigned long flags;
1040
1041         if (runtime->buffer == NULL) {
1042                 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1043                 return 1;
1044         }
1045         spin_lock_irqsave(&runtime->lock, flags);
1046         result = runtime->avail >= runtime->buffer_size;
1047         spin_unlock_irqrestore(&runtime->lock, flags);
1048         return result;          
1049 }
1050
1051 /**
1052  * snd_rawmidi_transmit_peek - copy data from the internal buffer
1053  * @substream: the rawmidi substream
1054  * @buffer: the buffer pointer
1055  * @count: data size to transfer
1056  *
1057  * Copies data from the internal output buffer to the given buffer.
1058  *
1059  * Call this in the interrupt handler when the midi output is ready,
1060  * and call snd_rawmidi_transmit_ack() after the transmission is
1061  * finished.
1062  *
1063  * Returns the size of copied data, or a negative error code on failure.
1064  */
1065 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1066                               unsigned char *buffer, int count)
1067 {
1068         unsigned long flags;
1069         int result, count1;
1070         struct snd_rawmidi_runtime *runtime = substream->runtime;
1071
1072         if (runtime->buffer == NULL) {
1073                 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1074                 return -EINVAL;
1075         }
1076         result = 0;
1077         spin_lock_irqsave(&runtime->lock, flags);
1078         if (runtime->avail >= runtime->buffer_size) {
1079                 /* warning: lowlevel layer MUST trigger down the hardware */
1080                 goto __skip;
1081         }
1082         if (count == 1) {       /* special case, faster code */
1083                 *buffer = runtime->buffer[runtime->hw_ptr];
1084                 result++;
1085         } else {
1086                 count1 = runtime->buffer_size - runtime->hw_ptr;
1087                 if (count1 > count)
1088                         count1 = count;
1089                 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1090                         count1 = runtime->buffer_size - runtime->avail;
1091                 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1092                 count -= count1;
1093                 result += count1;
1094                 if (count > 0) {
1095                         if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1096                                 count = runtime->buffer_size - runtime->avail - count1;
1097                         memcpy(buffer + count1, runtime->buffer, count);
1098                         result += count;
1099                 }
1100         }
1101       __skip:
1102         spin_unlock_irqrestore(&runtime->lock, flags);
1103         return result;
1104 }
1105
1106 /**
1107  * snd_rawmidi_transmit_ack - acknowledge the transmission
1108  * @substream: the rawmidi substream
1109  * @count: the tranferred count
1110  *
1111  * Advances the hardware pointer for the internal output buffer with
1112  * the given size and updates the condition.
1113  * Call after the transmission is finished.
1114  *
1115  * Returns the advanced size if successful, or a negative error code on failure.
1116  */
1117 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1118 {
1119         unsigned long flags;
1120         struct snd_rawmidi_runtime *runtime = substream->runtime;
1121
1122         if (runtime->buffer == NULL) {
1123                 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1124                 return -EINVAL;
1125         }
1126         spin_lock_irqsave(&runtime->lock, flags);
1127         snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1128         runtime->hw_ptr += count;
1129         runtime->hw_ptr %= runtime->buffer_size;
1130         runtime->avail += count;
1131         substream->bytes += count;
1132         if (count > 0) {
1133                 if (runtime->drain || snd_rawmidi_ready(substream))
1134                         wake_up(&runtime->sleep);
1135         }
1136         spin_unlock_irqrestore(&runtime->lock, flags);
1137         return count;
1138 }
1139
1140 /**
1141  * snd_rawmidi_transmit - copy from the buffer to the device
1142  * @substream: the rawmidi substream
1143  * @buffer: the buffer pointer
1144  * @count: the data size to transfer
1145  * 
1146  * Copies data from the buffer to the device and advances the pointer.
1147  *
1148  * Returns the copied size if successful, or a negative error code on failure.
1149  */
1150 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1151                          unsigned char *buffer, int count)
1152 {
1153         if (!substream->opened)
1154                 return -EBADFD;
1155         count = snd_rawmidi_transmit_peek(substream, buffer, count);
1156         if (count < 0)
1157                 return count;
1158         return snd_rawmidi_transmit_ack(substream, count);
1159 }
1160
1161 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1162                                       const unsigned char __user *userbuf,
1163                                       const unsigned char *kernelbuf,
1164                                       long count)
1165 {
1166         unsigned long flags;
1167         long count1, result;
1168         struct snd_rawmidi_runtime *runtime = substream->runtime;
1169
1170         if (snd_BUG_ON(!kernelbuf && !userbuf))
1171                 return -EINVAL;
1172         if (snd_BUG_ON(!runtime->buffer))
1173                 return -EINVAL;
1174
1175         result = 0;
1176         spin_lock_irqsave(&runtime->lock, flags);
1177         if (substream->append) {
1178                 if ((long)runtime->avail < count) {
1179                         spin_unlock_irqrestore(&runtime->lock, flags);
1180                         return -EAGAIN;
1181                 }
1182         }
1183         while (count > 0 && runtime->avail > 0) {
1184                 count1 = runtime->buffer_size - runtime->appl_ptr;
1185                 if (count1 > count)
1186                         count1 = count;
1187                 if (count1 > (long)runtime->avail)
1188                         count1 = runtime->avail;
1189                 if (kernelbuf)
1190                         memcpy(runtime->buffer + runtime->appl_ptr,
1191                                kernelbuf + result, count1);
1192                 else if (userbuf) {
1193                         spin_unlock_irqrestore(&runtime->lock, flags);
1194                         if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1195                                            userbuf + result, count1)) {
1196                                 spin_lock_irqsave(&runtime->lock, flags);
1197                                 result = result > 0 ? result : -EFAULT;
1198                                 goto __end;
1199                         }
1200                         spin_lock_irqsave(&runtime->lock, flags);
1201                 }
1202                 runtime->appl_ptr += count1;
1203                 runtime->appl_ptr %= runtime->buffer_size;
1204                 runtime->avail -= count1;
1205                 result += count1;
1206                 count -= count1;
1207         }
1208       __end:
1209         count1 = runtime->avail < runtime->buffer_size;
1210         spin_unlock_irqrestore(&runtime->lock, flags);
1211         if (count1)
1212                 snd_rawmidi_output_trigger(substream, 1);
1213         return result;
1214 }
1215
1216 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1217                               const unsigned char *buf, long count)
1218 {
1219         return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1220 }
1221
1222 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1223                                  size_t count, loff_t *offset)
1224 {
1225         long result, timeout;
1226         int count1;
1227         struct snd_rawmidi_file *rfile;
1228         struct snd_rawmidi_runtime *runtime;
1229         struct snd_rawmidi_substream *substream;
1230
1231         rfile = file->private_data;
1232         substream = rfile->output;
1233         runtime = substream->runtime;
1234         /* we cannot put an atomic message to our buffer */
1235         if (substream->append && count > runtime->buffer_size)
1236                 return -EIO;
1237         result = 0;
1238         while (count > 0) {
1239                 spin_lock_irq(&runtime->lock);
1240                 while (!snd_rawmidi_ready_append(substream, count)) {
1241                         wait_queue_t wait;
1242                         if (file->f_flags & O_NONBLOCK) {
1243                                 spin_unlock_irq(&runtime->lock);
1244                                 return result > 0 ? result : -EAGAIN;
1245                         }
1246                         init_waitqueue_entry(&wait, current);
1247                         add_wait_queue(&runtime->sleep, &wait);
1248                         set_current_state(TASK_INTERRUPTIBLE);
1249                         spin_unlock_irq(&runtime->lock);
1250                         timeout = schedule_timeout(30 * HZ);
1251                         remove_wait_queue(&runtime->sleep, &wait);
1252                         if (signal_pending(current))
1253                                 return result > 0 ? result : -ERESTARTSYS;
1254                         if (!runtime->avail && !timeout)
1255                                 return result > 0 ? result : -EIO;
1256                         spin_lock_irq(&runtime->lock);
1257                 }
1258                 spin_unlock_irq(&runtime->lock);
1259                 count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1260                 if (count1 < 0)
1261                         return result > 0 ? result : count1;
1262                 result += count1;
1263                 buf += count1;
1264                 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1265                         break;
1266                 count -= count1;
1267         }
1268         if (file->f_flags & O_DSYNC) {
1269                 spin_lock_irq(&runtime->lock);
1270                 while (runtime->avail != runtime->buffer_size) {
1271                         wait_queue_t wait;
1272                         unsigned int last_avail = runtime->avail;
1273                         init_waitqueue_entry(&wait, current);
1274                         add_wait_queue(&runtime->sleep, &wait);
1275                         set_current_state(TASK_INTERRUPTIBLE);
1276                         spin_unlock_irq(&runtime->lock);
1277                         timeout = schedule_timeout(30 * HZ);
1278                         remove_wait_queue(&runtime->sleep, &wait);
1279                         if (signal_pending(current))
1280                                 return result > 0 ? result : -ERESTARTSYS;
1281                         if (runtime->avail == last_avail && !timeout)
1282                                 return result > 0 ? result : -EIO;
1283                         spin_lock_irq(&runtime->lock);
1284                 }
1285                 spin_unlock_irq(&runtime->lock);
1286         }
1287         return result;
1288 }
1289
1290 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1291 {
1292         struct snd_rawmidi_file *rfile;
1293         struct snd_rawmidi_runtime *runtime;
1294         unsigned int mask;
1295
1296         rfile = file->private_data;
1297         if (rfile->input != NULL) {
1298                 runtime = rfile->input->runtime;
1299                 snd_rawmidi_input_trigger(rfile->input, 1);
1300                 poll_wait(file, &runtime->sleep, wait);
1301         }
1302         if (rfile->output != NULL) {
1303                 runtime = rfile->output->runtime;
1304                 poll_wait(file, &runtime->sleep, wait);
1305         }
1306         mask = 0;
1307         if (rfile->input != NULL) {
1308                 if (snd_rawmidi_ready(rfile->input))
1309                         mask |= POLLIN | POLLRDNORM;
1310         }
1311         if (rfile->output != NULL) {
1312                 if (snd_rawmidi_ready(rfile->output))
1313                         mask |= POLLOUT | POLLWRNORM;
1314         }
1315         return mask;
1316 }
1317
1318 /*
1319  */
1320 #ifdef CONFIG_COMPAT
1321 #include "rawmidi_compat.c"
1322 #else
1323 #define snd_rawmidi_ioctl_compat        NULL
1324 #endif
1325
1326 /*
1327
1328  */
1329
1330 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1331                                        struct snd_info_buffer *buffer)
1332 {
1333         struct snd_rawmidi *rmidi;
1334         struct snd_rawmidi_substream *substream;
1335         struct snd_rawmidi_runtime *runtime;
1336
1337         rmidi = entry->private_data;
1338         snd_iprintf(buffer, "%s\n\n", rmidi->name);
1339         mutex_lock(&rmidi->open_mutex);
1340         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1341                 list_for_each_entry(substream,
1342                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1343                                     list) {
1344                         snd_iprintf(buffer,
1345                                     "Output %d\n"
1346                                     "  Tx bytes     : %lu\n",
1347                                     substream->number,
1348                                     (unsigned long) substream->bytes);
1349                         if (substream->opened) {
1350                                 snd_iprintf(buffer,
1351                                     "  Owner PID    : %d\n",
1352                                     pid_vnr(substream->pid));
1353                                 runtime = substream->runtime;
1354                                 snd_iprintf(buffer,
1355                                     "  Mode         : %s\n"
1356                                     "  Buffer size  : %lu\n"
1357                                     "  Avail        : %lu\n",
1358                                     runtime->oss ? "OSS compatible" : "native",
1359                                     (unsigned long) runtime->buffer_size,
1360                                     (unsigned long) runtime->avail);
1361                         }
1362                 }
1363         }
1364         if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1365                 list_for_each_entry(substream,
1366                                     &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1367                                     list) {
1368                         snd_iprintf(buffer,
1369                                     "Input %d\n"
1370                                     "  Rx bytes     : %lu\n",
1371                                     substream->number,
1372                                     (unsigned long) substream->bytes);
1373                         if (substream->opened) {
1374                                 snd_iprintf(buffer,
1375                                             "  Owner PID    : %d\n",
1376                                             pid_vnr(substream->pid));
1377                                 runtime = substream->runtime;
1378                                 snd_iprintf(buffer,
1379                                             "  Buffer size  : %lu\n"
1380                                             "  Avail        : %lu\n"
1381                                             "  Overruns     : %lu\n",
1382                                             (unsigned long) runtime->buffer_size,
1383                                             (unsigned long) runtime->avail,
1384                                             (unsigned long) runtime->xruns);
1385                         }
1386                 }
1387         }
1388         mutex_unlock(&rmidi->open_mutex);
1389 }
1390
1391 /*
1392  *  Register functions
1393  */
1394
1395 static const struct file_operations snd_rawmidi_f_ops =
1396 {
1397         .owner =        THIS_MODULE,
1398         .read =         snd_rawmidi_read,
1399         .write =        snd_rawmidi_write,
1400         .open =         snd_rawmidi_open,
1401         .release =      snd_rawmidi_release,
1402         .llseek =       no_llseek,
1403         .poll =         snd_rawmidi_poll,
1404         .unlocked_ioctl =       snd_rawmidi_ioctl,
1405         .compat_ioctl = snd_rawmidi_ioctl_compat,
1406 };
1407
1408 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1409                                         struct snd_rawmidi_str *stream,
1410                                         int direction,
1411                                         int count)
1412 {
1413         struct snd_rawmidi_substream *substream;
1414         int idx;
1415
1416         for (idx = 0; idx < count; idx++) {
1417                 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1418                 if (substream == NULL) {
1419                         snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1420                         return -ENOMEM;
1421                 }
1422                 substream->stream = direction;
1423                 substream->number = idx;
1424                 substream->rmidi = rmidi;
1425                 substream->pstr = stream;
1426                 list_add_tail(&substream->list, &stream->substreams);
1427                 stream->substream_count++;
1428         }
1429         return 0;
1430 }
1431
1432 /**
1433  * snd_rawmidi_new - create a rawmidi instance
1434  * @card: the card instance
1435  * @id: the id string
1436  * @device: the device index
1437  * @output_count: the number of output streams
1438  * @input_count: the number of input streams
1439  * @rrawmidi: the pointer to store the new rawmidi instance
1440  *
1441  * Creates a new rawmidi instance.
1442  * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1443  *
1444  * Returns zero if successful, or a negative error code on failure.
1445  */
1446 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1447                     int output_count, int input_count,
1448                     struct snd_rawmidi ** rrawmidi)
1449 {
1450         struct snd_rawmidi *rmidi;
1451         int err;
1452         static struct snd_device_ops ops = {
1453                 .dev_free = snd_rawmidi_dev_free,
1454                 .dev_register = snd_rawmidi_dev_register,
1455                 .dev_disconnect = snd_rawmidi_dev_disconnect,
1456         };
1457
1458         if (snd_BUG_ON(!card))
1459                 return -ENXIO;
1460         if (rrawmidi)
1461                 *rrawmidi = NULL;
1462         rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1463         if (rmidi == NULL) {
1464                 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1465                 return -ENOMEM;
1466         }
1467         rmidi->card = card;
1468         rmidi->device = device;
1469         mutex_init(&rmidi->open_mutex);
1470         init_waitqueue_head(&rmidi->open_wait);
1471         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1472         INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1473
1474         if (id != NULL)
1475                 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1476         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1477                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1478                                                 SNDRV_RAWMIDI_STREAM_INPUT,
1479                                                 input_count)) < 0) {
1480                 snd_rawmidi_free(rmidi);
1481                 return err;
1482         }
1483         if ((err = snd_rawmidi_alloc_substreams(rmidi,
1484                                                 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1485                                                 SNDRV_RAWMIDI_STREAM_OUTPUT,
1486                                                 output_count)) < 0) {
1487                 snd_rawmidi_free(rmidi);
1488                 return err;
1489         }
1490         if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1491                 snd_rawmidi_free(rmidi);
1492                 return err;
1493         }
1494         if (rrawmidi)
1495                 *rrawmidi = rmidi;
1496         return 0;
1497 }
1498
1499 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1500 {
1501         struct snd_rawmidi_substream *substream;
1502
1503         while (!list_empty(&stream->substreams)) {
1504                 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1505                 list_del(&substream->list);
1506                 kfree(substream);
1507         }
1508 }
1509
1510 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1511 {
1512         if (!rmidi)
1513                 return 0;
1514
1515         snd_info_free_entry(rmidi->proc_entry);
1516         rmidi->proc_entry = NULL;
1517         mutex_lock(&register_mutex);
1518         if (rmidi->ops && rmidi->ops->dev_unregister)
1519                 rmidi->ops->dev_unregister(rmidi);
1520         mutex_unlock(&register_mutex);
1521
1522         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1523         snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1524         if (rmidi->private_free)
1525                 rmidi->private_free(rmidi);
1526         kfree(rmidi);
1527         return 0;
1528 }
1529
1530 static int snd_rawmidi_dev_free(struct snd_device *device)
1531 {
1532         struct snd_rawmidi *rmidi = device->device_data;
1533         return snd_rawmidi_free(rmidi);
1534 }
1535
1536 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1537 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1538 {
1539         struct snd_rawmidi *rmidi = device->private_data;
1540         rmidi->seq_dev = NULL;
1541 }
1542 #endif
1543
1544 static int snd_rawmidi_dev_register(struct snd_device *device)
1545 {
1546         int err;
1547         struct snd_info_entry *entry;
1548         char name[16];
1549         struct snd_rawmidi *rmidi = device->device_data;
1550
1551         if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1552                 return -ENOMEM;
1553         mutex_lock(&register_mutex);
1554         if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1555                 mutex_unlock(&register_mutex);
1556                 return -EBUSY;
1557         }
1558         list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1559         sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1560         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1561                                        rmidi->card, rmidi->device,
1562                                        &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1563                 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1564                 list_del(&rmidi->list);
1565                 mutex_unlock(&register_mutex);
1566                 return err;
1567         }
1568         if (rmidi->ops && rmidi->ops->dev_register &&
1569             (err = rmidi->ops->dev_register(rmidi)) < 0) {
1570                 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1571                 list_del(&rmidi->list);
1572                 mutex_unlock(&register_mutex);
1573                 return err;
1574         }
1575 #ifdef CONFIG_SND_OSSEMUL
1576         rmidi->ossreg = 0;
1577         if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1578                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1579                                             rmidi->card, 0, &snd_rawmidi_f_ops,
1580                                             rmidi, name) < 0) {
1581                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1582                 } else {
1583                         rmidi->ossreg++;
1584 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1585                         snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1586 #endif
1587                 }
1588         }
1589         if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1590                 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1591                                             rmidi->card, 1, &snd_rawmidi_f_ops,
1592                                             rmidi, name) < 0) {
1593                         snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1594                 } else {
1595                         rmidi->ossreg++;
1596                 }
1597         }
1598 #endif /* CONFIG_SND_OSSEMUL */
1599         mutex_unlock(&register_mutex);
1600         sprintf(name, "midi%d", rmidi->device);
1601         entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1602         if (entry) {
1603                 entry->private_data = rmidi;
1604                 entry->c.text.read = snd_rawmidi_proc_info_read;
1605                 if (snd_info_register(entry) < 0) {
1606                         snd_info_free_entry(entry);
1607                         entry = NULL;
1608                 }
1609         }
1610         rmidi->proc_entry = entry;
1611 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1612         if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1613                 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1614                         rmidi->seq_dev->private_data = rmidi;
1615                         rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1616                         sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1617                         snd_device_register(rmidi->card, rmidi->seq_dev);
1618                 }
1619         }
1620 #endif
1621         return 0;
1622 }
1623
1624 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1625 {
1626         struct snd_rawmidi *rmidi = device->device_data;
1627
1628         mutex_lock(&register_mutex);
1629         list_del_init(&rmidi->list);
1630 #ifdef CONFIG_SND_OSSEMUL
1631         if (rmidi->ossreg) {
1632                 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1633                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1634 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1635                         snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1636 #endif
1637                 }
1638                 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1639                         snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1640                 rmidi->ossreg = 0;
1641         }
1642 #endif /* CONFIG_SND_OSSEMUL */
1643         snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1644         mutex_unlock(&register_mutex);
1645         return 0;
1646 }
1647
1648 /**
1649  * snd_rawmidi_set_ops - set the rawmidi operators
1650  * @rmidi: the rawmidi instance
1651  * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1652  * @ops: the operator table
1653  *
1654  * Sets the rawmidi operators for the given stream direction.
1655  */
1656 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1657                          struct snd_rawmidi_ops *ops)
1658 {
1659         struct snd_rawmidi_substream *substream;
1660         
1661         list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1662                 substream->ops = ops;
1663 }
1664
1665 /*
1666  *  ENTRY functions
1667  */
1668
1669 static int __init alsa_rawmidi_init(void)
1670 {
1671
1672         snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1673         snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1674 #ifdef CONFIG_SND_OSSEMUL
1675         { int i;
1676         /* check device map table */
1677         for (i = 0; i < SNDRV_CARDS; i++) {
1678                 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1679                         snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1680                         midi_map[i] = 0;
1681                 }
1682                 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1683                         snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1684                         amidi_map[i] = 1;
1685                 }
1686         }
1687         }
1688 #endif /* CONFIG_SND_OSSEMUL */
1689         return 0;
1690 }
1691
1692 static void __exit alsa_rawmidi_exit(void)
1693 {
1694         snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1695         snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1696 }
1697
1698 module_init(alsa_rawmidi_init)
1699 module_exit(alsa_rawmidi_exit)
1700
1701 EXPORT_SYMBOL(snd_rawmidi_output_params);
1702 EXPORT_SYMBOL(snd_rawmidi_input_params);
1703 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1704 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1705 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1706 EXPORT_SYMBOL(snd_rawmidi_receive);
1707 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1708 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1709 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1710 EXPORT_SYMBOL(snd_rawmidi_transmit);
1711 EXPORT_SYMBOL(snd_rawmidi_new);
1712 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1713 EXPORT_SYMBOL(snd_rawmidi_info_select);
1714 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1715 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1716 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1717 EXPORT_SYMBOL(snd_rawmidi_kernel_write);