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V4L/DVB (3568b): saa7111: Prevent array overrun
[linux-2.6/zen-sources.git] / sound / core / rawmidi.c
blob6b7a3677429891c041fd77a6108dbce0b614c87f
1 /*
2 * Abstract layer for MIDI v1.0 stream
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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/driver.h>
23 #include <sound/core.h>
24 #include <linux/major.h>
25 #include <linux/init.h>
26 #include <linux/smp_lock.h>
27 #include <linux/sched.h>
28 #include <linux/slab.h>
29 #include <linux/time.h>
30 #include <linux/wait.h>
31 #include <linux/mutex.h>
32 #include <linux/moduleparam.h>
33 #include <linux/delay.h>
34 #include <linux/wait.h>
35 #include <sound/rawmidi.h>
36 #include <sound/info.h>
37 #include <sound/control.h>
38 #include <sound/minors.h>
39 #include <sound/initval.h>
40
41 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
42 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
43 MODULE_LICENSE("GPL");
44
45 #ifdef CONFIG_SND_OSSEMUL
46 static int midi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 0};
47 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
48 module_param_array(midi_map, int, NULL, 0444);
49 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
50 module_param_array(amidi_map, int, NULL, 0444);
51 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
52 #endif /* CONFIG_SND_OSSEMUL */
53
54 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
55 static int snd_rawmidi_dev_free(struct snd_device *device);
56 static int snd_rawmidi_dev_register(struct snd_device *device);
57 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
58 static int snd_rawmidi_dev_unregister(struct snd_device *device);
59
60 static LIST_HEAD(snd_rawmidi_devices);
61 static DEFINE_MUTEX(register_mutex);
62
63 static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
64 {
65 struct list_head *p;
66 struct snd_rawmidi *rawmidi;
67
68 list_for_each(p, &snd_rawmidi_devices) {
69 rawmidi = list_entry(p, struct snd_rawmidi, list);
70 if (rawmidi->card == card && rawmidi->device == device)
71 return rawmidi;
72 }
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_tasklet(unsigned long data)
103 {
104 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
105 substream->runtime->event(substream);
106 }
107
108 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
109 {
110 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
111 substream->ops->trigger(substream, 1);
112 }
113
114 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
115 {
116 struct snd_rawmidi_runtime *runtime;
117
118 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
119 return -ENOMEM;
120 spin_lock_init(&runtime->lock);
121 init_waitqueue_head(&runtime->sleep);
122 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
123 tasklet_init(&runtime->tasklet,
124 snd_rawmidi_input_event_tasklet,
125 (unsigned long)substream);
126 else
127 tasklet_init(&runtime->tasklet,
128 snd_rawmidi_output_trigger_tasklet,
129 (unsigned long)substream);
130 runtime->event = NULL;
131 runtime->buffer_size = PAGE_SIZE;
132 runtime->avail_min = 1;
133 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
134 runtime->avail = 0;
135 else
136 runtime->avail = runtime->buffer_size;
137 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
138 kfree(runtime);
139 return -ENOMEM;
140 }
141 runtime->appl_ptr = runtime->hw_ptr = 0;
142 substream->runtime = runtime;
143 return 0;
144 }
145
146 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
147 {
148 struct snd_rawmidi_runtime *runtime = substream->runtime;
149
150 kfree(runtime->buffer);
151 kfree(runtime);
152 substream->runtime = NULL;
153 return 0;
154 }
155
156 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
157 {
158 if (up) {
159 tasklet_hi_schedule(&substream->runtime->tasklet);
160 } else {
161 tasklet_kill(&substream->runtime->tasklet);
162 substream->ops->trigger(substream, 0);
163 }
164 }
165
166 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
167 {
168 substream->ops->trigger(substream, up);
169 if (!up && substream->runtime->event)
170 tasklet_kill(&substream->runtime->tasklet);
171 }
172
173 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
174 {
175 unsigned long flags;
176 struct snd_rawmidi_runtime *runtime = substream->runtime;
177
178 snd_rawmidi_output_trigger(substream, 0);
179 runtime->drain = 0;
180 spin_lock_irqsave(&runtime->lock, flags);
181 runtime->appl_ptr = runtime->hw_ptr = 0;
182 runtime->avail = runtime->buffer_size;
183 spin_unlock_irqrestore(&runtime->lock, flags);
184 return 0;
185 }
186
187 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
188 {
189 int err;
190 long timeout;
191 struct snd_rawmidi_runtime *runtime = substream->runtime;
192
193 err = 0;
194 runtime->drain = 1;
195 timeout = wait_event_interruptible_timeout(runtime->sleep,
196 (runtime->avail >= runtime->buffer_size),
197 10*HZ);
198 if (signal_pending(current))
199 err = -ERESTARTSYS;
200 if (runtime->avail < runtime->buffer_size && !timeout) {
201 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
202 err = -EIO;
203 }
204 runtime->drain = 0;
205 if (err != -ERESTARTSYS) {
206 /* we need wait a while to make sure that Tx FIFOs are empty */
207 if (substream->ops->drain)
208 substream->ops->drain(substream);
209 else
210 msleep(50);
211 snd_rawmidi_drop_output(substream);
212 }
213 return err;
214 }
215
216 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
217 {
218 unsigned long flags;
219 struct snd_rawmidi_runtime *runtime = substream->runtime;
220
221 snd_rawmidi_input_trigger(substream, 0);
222 runtime->drain = 0;
223 spin_lock_irqsave(&runtime->lock, flags);
224 runtime->appl_ptr = runtime->hw_ptr = 0;
225 runtime->avail = 0;
226 spin_unlock_irqrestore(&runtime->lock, flags);
227 return 0;
228 }
229
230 int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
231 int mode, struct snd_rawmidi_file * rfile)
232 {
233 struct snd_rawmidi *rmidi;
234 struct list_head *list1, *list2;
235 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
236 struct snd_rawmidi_runtime *input = NULL, *output = NULL;
237 int err;
238
239 if (rfile)
240 rfile->input = rfile->output = NULL;
241 mutex_lock(&register_mutex);
242 rmidi = snd_rawmidi_search(card, device);
243 mutex_unlock(&register_mutex);
244 if (rmidi == NULL) {
245 err = -ENODEV;
246 goto __error1;
247 }
248 if (!try_module_get(rmidi->card->module)) {
249 err = -EFAULT;
250 goto __error1;
251 }
252 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
253 mutex_lock(&rmidi->open_mutex);
254 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
255 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
256 err = -ENXIO;
257 goto __error;
258 }
259 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
260 err = -ENODEV;
261 goto __error;
262 }
263 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
264 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
265 err = -EAGAIN;
266 goto __error;
267 }
268 }
269 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
270 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
271 err = -ENXIO;
272 goto __error;
273 }
274 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
275 err = -ENODEV;
276 goto __error;
277 }
278 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
279 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
280 err = -EAGAIN;
281 goto __error;
282 }
283 }
284 list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
285 while (1) {
286 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
287 sinput = NULL;
288 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
289 err = -EAGAIN;
290 goto __error;
291 }
292 break;
293 }
294 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
295 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
296 goto __nexti;
297 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
298 break;
299 __nexti:
300 list1 = list1->next;
301 }
302 list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
303 while (1) {
304 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
305 soutput = NULL;
306 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
307 err = -EAGAIN;
308 goto __error;
309 }
310 break;
311 }
312 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
313 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
314 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
315 if (soutput->opened && !soutput->append)
316 goto __nexto;
317 } else {
318 if (soutput->opened)
319 goto __nexto;
320 }
321 }
322 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
323 break;
324 __nexto:
325 list2 = list2->next;
326 }
327 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
328 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
329 goto __error;
330 input = sinput->runtime;
331 if ((err = sinput->ops->open(sinput)) < 0)
332 goto __error;
333 sinput->opened = 1;
334 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
335 } else {
336 sinput = NULL;
337 }
338 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
339 if (soutput->opened)
340 goto __skip_output;
341 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
342 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
343 sinput->ops->close(sinput);
344 goto __error;
345 }
346 output = soutput->runtime;
347 if ((err = soutput->ops->open(soutput)) < 0) {
348 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
349 sinput->ops->close(sinput);
350 goto __error;
351 }
352 __skip_output:
353 soutput->opened = 1;
354 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
355 soutput->append = 1;
356 if (soutput->use_count++ == 0)
357 soutput->active_sensing = 1;
358 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
359 } else {
360 soutput = NULL;
361 }
362 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
363 mutex_unlock(&rmidi->open_mutex);
364 if (rfile) {
365 rfile->rmidi = rmidi;
366 rfile->input = sinput;
367 rfile->output = soutput;
368 }
369 return 0;
370
371 __error:
372 if (input != NULL)
373 snd_rawmidi_runtime_free(sinput);
374 if (output != NULL)
375 snd_rawmidi_runtime_free(soutput);
376 module_put(rmidi->card->module);
377 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
378 mutex_unlock(&rmidi->open_mutex);
379 __error1:
380 return err;
381 }
382
383 static int snd_rawmidi_open(struct inode *inode, struct file *file)
384 {
385 int maj = imajor(inode);
386 struct snd_card *card;
387 int subdevice;
388 unsigned short fflags;
389 int err;
390 struct snd_rawmidi *rmidi;
391 struct snd_rawmidi_file *rawmidi_file;
392 wait_queue_t wait;
393 struct list_head *list;
394 struct snd_ctl_file *kctl;
395
396 if (maj == snd_major) {
397 rmidi = snd_lookup_minor_data(iminor(inode),
398 SNDRV_DEVICE_TYPE_RAWMIDI);
399 #ifdef CONFIG_SND_OSSEMUL
400 } else if (maj == SOUND_MAJOR) {
401 rmidi = snd_lookup_oss_minor_data(iminor(inode),
402 SNDRV_OSS_DEVICE_TYPE_MIDI);
403 #endif
404 } else
405 return -ENXIO;
406
407 if (rmidi == NULL)
408 return -ENODEV;
409 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
410 return -EINVAL; /* invalid combination */
411 card = rmidi->card;
412 err = snd_card_file_add(card, file);
413 if (err < 0)
414 return -ENODEV;
415 fflags = snd_rawmidi_file_flags(file);
416 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
417 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
418 fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
419 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
420 if (rawmidi_file == NULL) {
421 snd_card_file_remove(card, file);
422 return -ENOMEM;
423 }
424 init_waitqueue_entry(&wait, current);
425 add_wait_queue(&rmidi->open_wait, &wait);
426 mutex_lock(&rmidi->open_mutex);
427 while (1) {
428 subdevice = -1;
429 down_read(&card->controls_rwsem);
430 list_for_each(list, &card->ctl_files) {
431 kctl = snd_ctl_file(list);
432 if (kctl->pid == current->pid) {
433 subdevice = kctl->prefer_rawmidi_subdevice;
434 break;
435 }
436 }
437 up_read(&card->controls_rwsem);
438 err = snd_rawmidi_kernel_open(rmidi->card, rmidi->device,
439 subdevice, fflags, rawmidi_file);
440 if (err >= 0)
441 break;
442 if (err == -EAGAIN) {
443 if (file->f_flags & O_NONBLOCK) {
444 err = -EBUSY;
445 break;
446 }
447 } else
448 break;
449 set_current_state(TASK_INTERRUPTIBLE);
450 mutex_unlock(&rmidi->open_mutex);
451 schedule();
452 mutex_lock(&rmidi->open_mutex);
453 if (signal_pending(current)) {
454 err = -ERESTARTSYS;
455 break;
456 }
457 }
458 #ifdef CONFIG_SND_OSSEMUL
459 if (rawmidi_file->input && rawmidi_file->input->runtime)
460 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
461 if (rawmidi_file->output && rawmidi_file->output->runtime)
462 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
463 #endif
464 remove_wait_queue(&rmidi->open_wait, &wait);
465 if (err >= 0) {
466 file->private_data = rawmidi_file;
467 } else {
468 snd_card_file_remove(card, file);
469 kfree(rawmidi_file);
470 }
471 mutex_unlock(&rmidi->open_mutex);
472 return err;
473 }
474
475 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
476 {
477 struct snd_rawmidi *rmidi;
478 struct snd_rawmidi_substream *substream;
479 struct snd_rawmidi_runtime *runtime;
480
481 snd_assert(rfile != NULL, return -ENXIO);
482 snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
483 rmidi = rfile->rmidi;
484 mutex_lock(&rmidi->open_mutex);
485 if (rfile->input != NULL) {
486 substream = rfile->input;
487 rfile->input = NULL;
488 runtime = substream->runtime;
489 snd_rawmidi_input_trigger(substream, 0);
490 substream->ops->close(substream);
491 if (runtime->private_free != NULL)
492 runtime->private_free(substream);
493 snd_rawmidi_runtime_free(substream);
494 substream->opened = 0;
495 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
496 }
497 if (rfile->output != NULL) {
498 substream = rfile->output;
499 rfile->output = NULL;
500 if (--substream->use_count == 0) {
501 runtime = substream->runtime;
502 if (substream->active_sensing) {
503 unsigned char buf = 0xfe;
504 /* sending single active sensing message to shut the device up */
505 snd_rawmidi_kernel_write(substream, &buf, 1);
506 }
507 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
508 snd_rawmidi_output_trigger(substream, 0);
509 substream->ops->close(substream);
510 if (runtime->private_free != NULL)
511 runtime->private_free(substream);
512 snd_rawmidi_runtime_free(substream);
513 substream->opened = 0;
514 substream->append = 0;
515 }
516 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
517 }
518 mutex_unlock(&rmidi->open_mutex);
519 module_put(rmidi->card->module);
520 return 0;
521 }
522
523 static int snd_rawmidi_release(struct inode *inode, struct file *file)
524 {
525 struct snd_rawmidi_file *rfile;
526 struct snd_rawmidi *rmidi;
527 int err;
528
529 rfile = file->private_data;
530 err = snd_rawmidi_kernel_release(rfile);
531 rmidi = rfile->rmidi;
532 wake_up(&rmidi->open_wait);
533 kfree(rfile);
534 snd_card_file_remove(rmidi->card, file);
535 return err;
536 }
537
538 static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
539 struct snd_rawmidi_info *info)
540 {
541 struct snd_rawmidi *rmidi;
542
543 if (substream == NULL)
544 return -ENODEV;
545 rmidi = substream->rmidi;
546 memset(info, 0, sizeof(*info));
547 info->card = rmidi->card->number;
548 info->device = rmidi->device;
549 info->subdevice = substream->number;
550 info->stream = substream->stream;
551 info->flags = rmidi->info_flags;
552 strcpy(info->id, rmidi->id);
553 strcpy(info->name, rmidi->name);
554 strcpy(info->subname, substream->name);
555 info->subdevices_count = substream->pstr->substream_count;
556 info->subdevices_avail = (substream->pstr->substream_count -
557 substream->pstr->substream_opened);
558 return 0;
559 }
560
561 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
562 struct snd_rawmidi_info __user * _info)
563 {
564 struct snd_rawmidi_info info;
565 int err;
566 if ((err = snd_rawmidi_info(substream, &info)) < 0)
567 return err;
568 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
569 return -EFAULT;
570 return 0;
571 }
572
573 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
574 {
575 struct snd_rawmidi *rmidi;
576 struct snd_rawmidi_str *pstr;
577 struct snd_rawmidi_substream *substream;
578 struct list_head *list;
579
580 mutex_lock(&register_mutex);
581 rmidi = snd_rawmidi_search(card, info->device);
582 mutex_unlock(&register_mutex);
583 if (!rmidi)
584 return -ENXIO;
585 if (info->stream < 0 || info->stream > 1)
586 return -EINVAL;
587 pstr = &rmidi->streams[info->stream];
588 if (pstr->substream_count == 0)
589 return -ENOENT;
590 if (info->subdevice >= pstr->substream_count)
591 return -ENXIO;
592 list_for_each(list, &pstr->substreams) {
593 substream = list_entry(list, struct snd_rawmidi_substream, list);
594 if ((unsigned int)substream->number == info->subdevice)
595 return snd_rawmidi_info(substream, info);
596 }
597 return -ENXIO;
598 }
599
600 static int snd_rawmidi_info_select_user(struct snd_card *card,
601 struct snd_rawmidi_info __user *_info)
602 {
603 int err;
604 struct snd_rawmidi_info info;
605 if (get_user(info.device, &_info->device))
606 return -EFAULT;
607 if (get_user(info.stream, &_info->stream))
608 return -EFAULT;
609 if (get_user(info.subdevice, &_info->subdevice))
610 return -EFAULT;
611 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
612 return err;
613 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
614 return -EFAULT;
615 return 0;
616 }
617
618 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
619 struct snd_rawmidi_params * params)
620 {
621 char *newbuf;
622 struct snd_rawmidi_runtime *runtime = substream->runtime;
623
624 if (substream->append && substream->use_count > 1)
625 return -EBUSY;
626 snd_rawmidi_drain_output(substream);
627 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
628 return -EINVAL;
629 }
630 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
631 return -EINVAL;
632 }
633 if (params->buffer_size != runtime->buffer_size) {
634 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
635 return -ENOMEM;
636 kfree(runtime->buffer);
637 runtime->buffer = newbuf;
638 runtime->buffer_size = params->buffer_size;
639 runtime->avail = runtime->buffer_size;
640 }
641 runtime->avail_min = params->avail_min;
642 substream->active_sensing = !params->no_active_sensing;
643 return 0;
644 }
645
646 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
647 struct snd_rawmidi_params * params)
648 {
649 char *newbuf;
650 struct snd_rawmidi_runtime *runtime = substream->runtime;
651
652 snd_rawmidi_drain_input(substream);
653 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
654 return -EINVAL;
655 }
656 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
657 return -EINVAL;
658 }
659 if (params->buffer_size != runtime->buffer_size) {
660 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
661 return -ENOMEM;
662 kfree(runtime->buffer);
663 runtime->buffer = newbuf;
664 runtime->buffer_size = params->buffer_size;
665 }
666 runtime->avail_min = params->avail_min;
667 return 0;
668 }
669
670 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
671 struct snd_rawmidi_status * status)
672 {
673 struct snd_rawmidi_runtime *runtime = substream->runtime;
674
675 memset(status, 0, sizeof(*status));
676 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
677 spin_lock_irq(&runtime->lock);
678 status->avail = runtime->avail;
679 spin_unlock_irq(&runtime->lock);
680 return 0;
681 }
682
683 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
684 struct snd_rawmidi_status * status)
685 {
686 struct snd_rawmidi_runtime *runtime = substream->runtime;
687
688 memset(status, 0, sizeof(*status));
689 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
690 spin_lock_irq(&runtime->lock);
691 status->avail = runtime->avail;
692 status->xruns = runtime->xruns;
693 runtime->xruns = 0;
694 spin_unlock_irq(&runtime->lock);
695 return 0;
696 }
697
698 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
699 {
700 struct snd_rawmidi_file *rfile;
701 void __user *argp = (void __user *)arg;
702
703 rfile = file->private_data;
704 if (((cmd >> 8) & 0xff) != 'W')
705 return -ENOTTY;
706 switch (cmd) {
707 case SNDRV_RAWMIDI_IOCTL_PVERSION:
708 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
709 case SNDRV_RAWMIDI_IOCTL_INFO:
710 {
711 int stream;
712 struct snd_rawmidi_info __user *info = argp;
713 if (get_user(stream, &info->stream))
714 return -EFAULT;
715 switch (stream) {
716 case SNDRV_RAWMIDI_STREAM_INPUT:
717 return snd_rawmidi_info_user(rfile->input, info);
718 case SNDRV_RAWMIDI_STREAM_OUTPUT:
719 return snd_rawmidi_info_user(rfile->output, info);
720 default:
721 return -EINVAL;
722 }
723 }
724 case SNDRV_RAWMIDI_IOCTL_PARAMS:
725 {
726 struct snd_rawmidi_params params;
727 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
728 return -EFAULT;
729 switch (params.stream) {
730 case SNDRV_RAWMIDI_STREAM_OUTPUT:
731 if (rfile->output == NULL)
732 return -EINVAL;
733 return snd_rawmidi_output_params(rfile->output, &params);
734 case SNDRV_RAWMIDI_STREAM_INPUT:
735 if (rfile->input == NULL)
736 return -EINVAL;
737 return snd_rawmidi_input_params(rfile->input, &params);
738 default:
739 return -EINVAL;
740 }
741 }
742 case SNDRV_RAWMIDI_IOCTL_STATUS:
743 {
744 int err = 0;
745 struct snd_rawmidi_status status;
746 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
747 return -EFAULT;
748 switch (status.stream) {
749 case SNDRV_RAWMIDI_STREAM_OUTPUT:
750 if (rfile->output == NULL)
751 return -EINVAL;
752 err = snd_rawmidi_output_status(rfile->output, &status);
753 break;
754 case SNDRV_RAWMIDI_STREAM_INPUT:
755 if (rfile->input == NULL)
756 return -EINVAL;
757 err = snd_rawmidi_input_status(rfile->input, &status);
758 break;
759 default:
760 return -EINVAL;
761 }
762 if (err < 0)
763 return err;
764 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
765 return -EFAULT;
766 return 0;
767 }
768 case SNDRV_RAWMIDI_IOCTL_DROP:
769 {
770 int val;
771 if (get_user(val, (int __user *) argp))
772 return -EFAULT;
773 switch (val) {
774 case SNDRV_RAWMIDI_STREAM_OUTPUT:
775 if (rfile->output == NULL)
776 return -EINVAL;
777 return snd_rawmidi_drop_output(rfile->output);
778 default:
779 return -EINVAL;
780 }
781 }
782 case SNDRV_RAWMIDI_IOCTL_DRAIN:
783 {
784 int val;
785 if (get_user(val, (int __user *) argp))
786 return -EFAULT;
787 switch (val) {
788 case SNDRV_RAWMIDI_STREAM_OUTPUT:
789 if (rfile->output == NULL)
790 return -EINVAL;
791 return snd_rawmidi_drain_output(rfile->output);
792 case SNDRV_RAWMIDI_STREAM_INPUT:
793 if (rfile->input == NULL)
794 return -EINVAL;
795 return snd_rawmidi_drain_input(rfile->input);
796 default:
797 return -EINVAL;
798 }
799 }
800 #ifdef CONFIG_SND_DEBUG
801 default:
802 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
803 #endif
804 }
805 return -ENOTTY;
806 }
807
808 static int snd_rawmidi_control_ioctl(struct snd_card *card,
809 struct snd_ctl_file *control,
810 unsigned int cmd,
811 unsigned long arg)
812 {
813 void __user *argp = (void __user *)arg;
814
815 switch (cmd) {
816 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
817 {
818 int device;
819
820 if (get_user(device, (int __user *)argp))
821 return -EFAULT;
822 mutex_lock(&register_mutex);
823 device = device < 0 ? 0 : device + 1;
824 while (device < SNDRV_RAWMIDI_DEVICES) {
825 if (snd_rawmidi_search(card, device))
826 break;
827 device++;
828 }
829 if (device == SNDRV_RAWMIDI_DEVICES)
830 device = -1;
831 mutex_unlock(&register_mutex);
832 if (put_user(device, (int __user *)argp))
833 return -EFAULT;
834 return 0;
835 }
836 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
837 {
838 int val;
839
840 if (get_user(val, (int __user *)argp))
841 return -EFAULT;
842 control->prefer_rawmidi_subdevice = val;
843 return 0;
844 }
845 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
846 return snd_rawmidi_info_select_user(card, argp);
847 }
848 return -ENOIOCTLCMD;
849 }
850
851 /**
852 * snd_rawmidi_receive - receive the input data from the device
853 * @substream: the rawmidi substream
854 * @buffer: the buffer pointer
855 * @count: the data size to read
856 *
857 * Reads the data from the internal buffer.
858 *
859 * Returns the size of read data, or a negative error code on failure.
860 */
861 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
862 const unsigned char *buffer, int count)
863 {
864 unsigned long flags;
865 int result = 0, count1;
866 struct snd_rawmidi_runtime *runtime = substream->runtime;
867
868 if (runtime->buffer == NULL) {
869 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
870 return -EINVAL;
871 }
872 spin_lock_irqsave(&runtime->lock, flags);
873 if (count == 1) { /* special case, faster code */
874 substream->bytes++;
875 if (runtime->avail < runtime->buffer_size) {
876 runtime->buffer[runtime->hw_ptr++] = buffer[0];
877 runtime->hw_ptr %= runtime->buffer_size;
878 runtime->avail++;
879 result++;
880 } else {
881 runtime->xruns++;
882 }
883 } else {
884 substream->bytes += count;
885 count1 = runtime->buffer_size - runtime->hw_ptr;
886 if (count1 > count)
887 count1 = count;
888 if (count1 > (int)(runtime->buffer_size - runtime->avail))
889 count1 = runtime->buffer_size - runtime->avail;
890 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
891 runtime->hw_ptr += count1;
892 runtime->hw_ptr %= runtime->buffer_size;
893 runtime->avail += count1;
894 count -= count1;
895 result += count1;
896 if (count > 0) {
897 buffer += count1;
898 count1 = count;
899 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
900 count1 = runtime->buffer_size - runtime->avail;
901 runtime->xruns += count - count1;
902 }
903 if (count1 > 0) {
904 memcpy(runtime->buffer, buffer, count1);
905 runtime->hw_ptr = count1;
906 runtime->avail += count1;
907 result += count1;
908 }
909 }
910 }
911 if (result > 0) {
912 if (runtime->event)
913 tasklet_hi_schedule(&runtime->tasklet);
914 else if (snd_rawmidi_ready(substream))
915 wake_up(&runtime->sleep);
916 }
917 spin_unlock_irqrestore(&runtime->lock, flags);
918 return result;
919 }
920
921 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
922 unsigned char *buf, long count, int kernel)
923 {
924 unsigned long flags;
925 long result = 0, count1;
926 struct snd_rawmidi_runtime *runtime = substream->runtime;
927
928 while (count > 0 && runtime->avail) {
929 count1 = runtime->buffer_size - runtime->appl_ptr;
930 if (count1 > count)
931 count1 = count;
932 spin_lock_irqsave(&runtime->lock, flags);
933 if (count1 > (int)runtime->avail)
934 count1 = runtime->avail;
935 if (kernel) {
936 memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
937 } else {
938 spin_unlock_irqrestore(&runtime->lock, flags);
939 if (copy_to_user((char __user *)buf + result,
940 runtime->buffer + runtime->appl_ptr, count1)) {
941 return result > 0 ? result : -EFAULT;
942 }
943 spin_lock_irqsave(&runtime->lock, flags);
944 }
945 runtime->appl_ptr += count1;
946 runtime->appl_ptr %= runtime->buffer_size;
947 runtime->avail -= count1;
948 spin_unlock_irqrestore(&runtime->lock, flags);
949 result += count1;
950 count -= count1;
951 }
952 return result;
953 }
954
955 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
956 unsigned char *buf, long count)
957 {
958 snd_rawmidi_input_trigger(substream, 1);
959 return snd_rawmidi_kernel_read1(substream, buf, count, 1);
960 }
961
962 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
963 loff_t *offset)
964 {
965 long result;
966 int count1;
967 struct snd_rawmidi_file *rfile;
968 struct snd_rawmidi_substream *substream;
969 struct snd_rawmidi_runtime *runtime;
970
971 rfile = file->private_data;
972 substream = rfile->input;
973 if (substream == NULL)
974 return -EIO;
975 runtime = substream->runtime;
976 snd_rawmidi_input_trigger(substream, 1);
977 result = 0;
978 while (count > 0) {
979 spin_lock_irq(&runtime->lock);
980 while (!snd_rawmidi_ready(substream)) {
981 wait_queue_t wait;
982 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
983 spin_unlock_irq(&runtime->lock);
984 return result > 0 ? result : -EAGAIN;
985 }
986 init_waitqueue_entry(&wait, current);
987 add_wait_queue(&runtime->sleep, &wait);
988 set_current_state(TASK_INTERRUPTIBLE);
989 spin_unlock_irq(&runtime->lock);
990 schedule();
991 remove_wait_queue(&runtime->sleep, &wait);
992 if (signal_pending(current))
993 return result > 0 ? result : -ERESTARTSYS;
994 if (!runtime->avail)
995 return result > 0 ? result : -EIO;
996 spin_lock_irq(&runtime->lock);
997 }
998 spin_unlock_irq(&runtime->lock);
999 count1 = snd_rawmidi_kernel_read1(substream,
1000 (unsigned char __force *)buf,
1001 count, 0);
1002 if (count1 < 0)
1003 return result > 0 ? result : count1;
1004 result += count1;
1005 buf += count1;
1006 count -= count1;
1007 }
1008 return result;
1009 }
1010
1011 /**
1012 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1013 * @substream: the rawmidi substream
1014 *
1015 * Returns 1 if the internal output buffer is empty, 0 if not.
1016 */
1017 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1018 {
1019 struct snd_rawmidi_runtime *runtime = substream->runtime;
1020 int result;
1021 unsigned long flags;
1022
1023 if (runtime->buffer == NULL) {
1024 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1025 return 1;
1026 }
1027 spin_lock_irqsave(&runtime->lock, flags);
1028 result = runtime->avail >= runtime->buffer_size;
1029 spin_unlock_irqrestore(&runtime->lock, flags);
1030 return result;
1031 }
1032
1033 /**
1034 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1035 * @substream: the rawmidi substream
1036 * @buffer: the buffer pointer
1037 * @count: data size to transfer
1038 *
1039 * Copies data from the internal output buffer to the given buffer.
1040 *
1041 * Call this in the interrupt handler when the midi output is ready,
1042 * and call snd_rawmidi_transmit_ack() after the transmission is
1043 * finished.
1044 *
1045 * Returns the size of copied data, or a negative error code on failure.
1046 */
1047 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1048 unsigned char *buffer, int count)
1049 {
1050 unsigned long flags;
1051 int result, count1;
1052 struct snd_rawmidi_runtime *runtime = substream->runtime;
1053
1054 if (runtime->buffer == NULL) {
1055 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1056 return -EINVAL;
1057 }
1058 result = 0;
1059 spin_lock_irqsave(&runtime->lock, flags);
1060 if (runtime->avail >= runtime->buffer_size) {
1061 /* warning: lowlevel layer MUST trigger down the hardware */
1062 goto __skip;
1063 }
1064 if (count == 1) { /* special case, faster code */
1065 *buffer = runtime->buffer[runtime->hw_ptr];
1066 result++;
1067 } else {
1068 count1 = runtime->buffer_size - runtime->hw_ptr;
1069 if (count1 > count)
1070 count1 = count;
1071 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1072 count1 = runtime->buffer_size - runtime->avail;
1073 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1074 count -= count1;
1075 result += count1;
1076 if (count > 0) {
1077 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1078 count = runtime->buffer_size - runtime->avail - count1;
1079 memcpy(buffer + count1, runtime->buffer, count);
1080 result += count;
1081 }
1082 }
1083 __skip:
1084 spin_unlock_irqrestore(&runtime->lock, flags);
1085 return result;
1086 }
1087
1088 /**
1089 * snd_rawmidi_transmit_ack - acknowledge the transmission
1090 * @substream: the rawmidi substream
1091 * @count: the tranferred count
1092 *
1093 * Advances the hardware pointer for the internal output buffer with
1094 * the given size and updates the condition.
1095 * Call after the transmission is finished.
1096 *
1097 * Returns the advanced size if successful, or a negative error code on failure.
1098 */
1099 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1100 {
1101 unsigned long flags;
1102 struct snd_rawmidi_runtime *runtime = substream->runtime;
1103
1104 if (runtime->buffer == NULL) {
1105 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1106 return -EINVAL;
1107 }
1108 spin_lock_irqsave(&runtime->lock, flags);
1109 snd_assert(runtime->avail + count <= runtime->buffer_size, );
1110 runtime->hw_ptr += count;
1111 runtime->hw_ptr %= runtime->buffer_size;
1112 runtime->avail += count;
1113 substream->bytes += count;
1114 if (count > 0) {
1115 if (runtime->drain || snd_rawmidi_ready(substream))
1116 wake_up(&runtime->sleep);
1117 }
1118 spin_unlock_irqrestore(&runtime->lock, flags);
1119 return count;
1120 }
1121
1122 /**
1123 * snd_rawmidi_transmit - copy from the buffer to the device
1124 * @substream: the rawmidi substream
1125 * @buffer: the buffer pointer
1126 * @count: the data size to transfer
1127 *
1128 * Copies data from the buffer to the device and advances the pointer.
1129 *
1130 * Returns the copied size if successful, or a negative error code on failure.
1131 */
1132 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1133 unsigned char *buffer, int count)
1134 {
1135 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1136 if (count < 0)
1137 return count;
1138 return snd_rawmidi_transmit_ack(substream, count);
1139 }
1140
1141 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1142 const unsigned char *buf, long count, int kernel)
1143 {
1144 unsigned long flags;
1145 long count1, result;
1146 struct snd_rawmidi_runtime *runtime = substream->runtime;
1147
1148 snd_assert(buf != NULL, return -EINVAL);
1149 snd_assert(runtime->buffer != NULL, return -EINVAL);
1150
1151 result = 0;
1152 spin_lock_irqsave(&runtime->lock, flags);
1153 if (substream->append) {
1154 if ((long)runtime->avail < count) {
1155 spin_unlock_irqrestore(&runtime->lock, flags);
1156 return -EAGAIN;
1157 }
1158 }
1159 while (count > 0 && runtime->avail > 0) {
1160 count1 = runtime->buffer_size - runtime->appl_ptr;
1161 if (count1 > count)
1162 count1 = count;
1163 if (count1 > (long)runtime->avail)
1164 count1 = runtime->avail;
1165 if (kernel) {
1166 memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1167 } else {
1168 spin_unlock_irqrestore(&runtime->lock, flags);
1169 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1170 (char __user *)buf, count1)) {
1171 spin_lock_irqsave(&runtime->lock, flags);
1172 result = result > 0 ? result : -EFAULT;
1173 goto __end;
1174 }
1175 spin_lock_irqsave(&runtime->lock, flags);
1176 }
1177 runtime->appl_ptr += count1;
1178 runtime->appl_ptr %= runtime->buffer_size;
1179 runtime->avail -= count1;
1180 result += count1;
1181 buf += count1;
1182 count -= count1;
1183 }
1184 __end:
1185 count1 = runtime->avail < runtime->buffer_size;
1186 spin_unlock_irqrestore(&runtime->lock, flags);
1187 if (count1)
1188 snd_rawmidi_output_trigger(substream, 1);
1189 return result;
1190 }
1191
1192 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1193 const unsigned char *buf, long count)
1194 {
1195 return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1196 }
1197
1198 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1199 size_t count, loff_t *offset)
1200 {
1201 long result, timeout;
1202 int count1;
1203 struct snd_rawmidi_file *rfile;
1204 struct snd_rawmidi_runtime *runtime;
1205 struct snd_rawmidi_substream *substream;
1206
1207 rfile = file->private_data;
1208 substream = rfile->output;
1209 runtime = substream->runtime;
1210 /* we cannot put an atomic message to our buffer */
1211 if (substream->append && count > runtime->buffer_size)
1212 return -EIO;
1213 result = 0;
1214 while (count > 0) {
1215 spin_lock_irq(&runtime->lock);
1216 while (!snd_rawmidi_ready_append(substream, count)) {
1217 wait_queue_t wait;
1218 if (file->f_flags & O_NONBLOCK) {
1219 spin_unlock_irq(&runtime->lock);
1220 return result > 0 ? result : -EAGAIN;
1221 }
1222 init_waitqueue_entry(&wait, current);
1223 add_wait_queue(&runtime->sleep, &wait);
1224 set_current_state(TASK_INTERRUPTIBLE);
1225 spin_unlock_irq(&runtime->lock);
1226 timeout = schedule_timeout(30 * HZ);
1227 remove_wait_queue(&runtime->sleep, &wait);
1228 if (signal_pending(current))
1229 return result > 0 ? result : -ERESTARTSYS;
1230 if (!runtime->avail && !timeout)
1231 return result > 0 ? result : -EIO;
1232 spin_lock_irq(&runtime->lock);
1233 }
1234 spin_unlock_irq(&runtime->lock);
1235 count1 = snd_rawmidi_kernel_write1(substream,
1236 (unsigned char __force *)buf,
1237 count, 0);
1238 if (count1 < 0)
1239 return result > 0 ? result : count1;
1240 result += count1;
1241 buf += count1;
1242 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1243 break;
1244 count -= count1;
1245 }
1246 if (file->f_flags & O_SYNC) {
1247 spin_lock_irq(&runtime->lock);
1248 while (runtime->avail != runtime->buffer_size) {
1249 wait_queue_t wait;
1250 unsigned int last_avail = runtime->avail;
1251 init_waitqueue_entry(&wait, current);
1252 add_wait_queue(&runtime->sleep, &wait);
1253 set_current_state(TASK_INTERRUPTIBLE);
1254 spin_unlock_irq(&runtime->lock);
1255 timeout = schedule_timeout(30 * HZ);
1256 remove_wait_queue(&runtime->sleep, &wait);
1257 if (signal_pending(current))
1258 return result > 0 ? result : -ERESTARTSYS;
1259 if (runtime->avail == last_avail && !timeout)
1260 return result > 0 ? result : -EIO;
1261 spin_lock_irq(&runtime->lock);
1262 }
1263 spin_unlock_irq(&runtime->lock);
1264 }
1265 return result;
1266 }
1267
1268 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1269 {
1270 struct snd_rawmidi_file *rfile;
1271 struct snd_rawmidi_runtime *runtime;
1272 unsigned int mask;
1273
1274 rfile = file->private_data;
1275 if (rfile->input != NULL) {
1276 runtime = rfile->input->runtime;
1277 snd_rawmidi_input_trigger(rfile->input, 1);
1278 poll_wait(file, &runtime->sleep, wait);
1279 }
1280 if (rfile->output != NULL) {
1281 runtime = rfile->output->runtime;
1282 poll_wait(file, &runtime->sleep, wait);
1283 }
1284 mask = 0;
1285 if (rfile->input != NULL) {
1286 if (snd_rawmidi_ready(rfile->input))
1287 mask |= POLLIN | POLLRDNORM;
1288 }
1289 if (rfile->output != NULL) {
1290 if (snd_rawmidi_ready(rfile->output))
1291 mask |= POLLOUT | POLLWRNORM;
1292 }
1293 return mask;
1294 }
1295
1296 /*
1297 */
1298 #ifdef CONFIG_COMPAT
1299 #include "rawmidi_compat.c"
1300 #else
1301 #define snd_rawmidi_ioctl_compat NULL
1302 #endif
1303
1304 /*
1305
1306 */
1307
1308 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1309 struct snd_info_buffer *buffer)
1310 {
1311 struct snd_rawmidi *rmidi;
1312 struct snd_rawmidi_substream *substream;
1313 struct snd_rawmidi_runtime *runtime;
1314 struct list_head *list;
1315
1316 rmidi = entry->private_data;
1317 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1318 mutex_lock(&rmidi->open_mutex);
1319 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1320 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1321 substream = list_entry(list, struct snd_rawmidi_substream, list);
1322 snd_iprintf(buffer,
1323 "Output %d\n"
1324 " Tx bytes : %lu\n",
1325 substream->number,
1326 (unsigned long) substream->bytes);
1327 if (substream->opened) {
1328 runtime = substream->runtime;
1329 snd_iprintf(buffer,
1330 " Mode : %s\n"
1331 " Buffer size : %lu\n"
1332 " Avail : %lu\n",
1333 runtime->oss ? "OSS compatible" : "native",
1334 (unsigned long) runtime->buffer_size,
1335 (unsigned long) runtime->avail);
1336 }
1337 }
1338 }
1339 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1340 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1341 substream = list_entry(list, struct snd_rawmidi_substream, list);
1342 snd_iprintf(buffer,
1343 "Input %d\n"
1344 " Rx bytes : %lu\n",
1345 substream->number,
1346 (unsigned long) substream->bytes);
1347 if (substream->opened) {
1348 runtime = substream->runtime;
1349 snd_iprintf(buffer,
1350 " Buffer size : %lu\n"
1351 " Avail : %lu\n"
1352 " Overruns : %lu\n",
1353 (unsigned long) runtime->buffer_size,
1354 (unsigned long) runtime->avail,
1355 (unsigned long) runtime->xruns);
1356 }
1357 }
1358 }
1359 mutex_unlock(&rmidi->open_mutex);
1360 }
1361
1362 /*
1363 * Register functions
1364 */
1365
1366 static struct file_operations snd_rawmidi_f_ops =
1367 {
1368 .owner = THIS_MODULE,
1369 .read = snd_rawmidi_read,
1370 .write = snd_rawmidi_write,
1371 .open = snd_rawmidi_open,
1372 .release = snd_rawmidi_release,
1373 .poll = snd_rawmidi_poll,
1374 .unlocked_ioctl = snd_rawmidi_ioctl,
1375 .compat_ioctl = snd_rawmidi_ioctl_compat,
1376 };
1377
1378 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1379 struct snd_rawmidi_str *stream,
1380 int direction,
1381 int count)
1382 {
1383 struct snd_rawmidi_substream *substream;
1384 int idx;
1385
1386 INIT_LIST_HEAD(&stream->substreams);
1387 for (idx = 0; idx < count; idx++) {
1388 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1389 if (substream == NULL) {
1390 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1391 return -ENOMEM;
1392 }
1393 substream->stream = direction;
1394 substream->number = idx;
1395 substream->rmidi = rmidi;
1396 substream->pstr = stream;
1397 list_add_tail(&substream->list, &stream->substreams);
1398 stream->substream_count++;
1399 }
1400 return 0;
1401 }
1402
1403 /**
1404 * snd_rawmidi_new - create a rawmidi instance
1405 * @card: the card instance
1406 * @id: the id string
1407 * @device: the device index
1408 * @output_count: the number of output streams
1409 * @input_count: the number of input streams
1410 * @rrawmidi: the pointer to store the new rawmidi instance
1411 *
1412 * Creates a new rawmidi instance.
1413 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1414 *
1415 * Returns zero if successful, or a negative error code on failure.
1416 */
1417 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1418 int output_count, int input_count,
1419 struct snd_rawmidi ** rrawmidi)
1420 {
1421 struct snd_rawmidi *rmidi;
1422 int err;
1423 static struct snd_device_ops ops = {
1424 .dev_free = snd_rawmidi_dev_free,
1425 .dev_register = snd_rawmidi_dev_register,
1426 .dev_disconnect = snd_rawmidi_dev_disconnect,
1427 .dev_unregister = snd_rawmidi_dev_unregister
1428 };
1429
1430 snd_assert(rrawmidi != NULL, return -EINVAL);
1431 *rrawmidi = NULL;
1432 snd_assert(card != NULL, return -ENXIO);
1433 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1434 if (rmidi == NULL) {
1435 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1436 return -ENOMEM;
1437 }
1438 rmidi->card = card;
1439 rmidi->device = device;
1440 mutex_init(&rmidi->open_mutex);
1441 init_waitqueue_head(&rmidi->open_wait);
1442 if (id != NULL)
1443 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1444 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1445 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1446 SNDRV_RAWMIDI_STREAM_INPUT,
1447 input_count)) < 0) {
1448 snd_rawmidi_free(rmidi);
1449 return err;
1450 }
1451 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1452 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1453 SNDRV_RAWMIDI_STREAM_OUTPUT,
1454 output_count)) < 0) {
1455 snd_rawmidi_free(rmidi);
1456 return err;
1457 }
1458 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1459 snd_rawmidi_free(rmidi);
1460 return err;
1461 }
1462 *rrawmidi = rmidi;
1463 return 0;
1464 }
1465
1466 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1467 {
1468 struct snd_rawmidi_substream *substream;
1469
1470 while (!list_empty(&stream->substreams)) {
1471 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1472 list_del(&substream->list);
1473 kfree(substream);
1474 }
1475 }
1476
1477 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1478 {
1479 snd_assert(rmidi != NULL, return -ENXIO);
1480 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1481 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1482 if (rmidi->private_free)
1483 rmidi->private_free(rmidi);
1484 kfree(rmidi);
1485 return 0;
1486 }
1487
1488 static int snd_rawmidi_dev_free(struct snd_device *device)
1489 {
1490 struct snd_rawmidi *rmidi = device->device_data;
1491 return snd_rawmidi_free(rmidi);
1492 }
1493
1494 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1495 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1496 {
1497 struct snd_rawmidi *rmidi = device->private_data;
1498 rmidi->seq_dev = NULL;
1499 }
1500 #endif
1501
1502 static int snd_rawmidi_dev_register(struct snd_device *device)
1503 {
1504 int err;
1505 struct snd_info_entry *entry;
1506 char name[16];
1507 struct snd_rawmidi *rmidi = device->device_data;
1508
1509 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1510 return -ENOMEM;
1511 mutex_lock(&register_mutex);
1512 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1513 mutex_unlock(&register_mutex);
1514 return -EBUSY;
1515 }
1516 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1517 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1518 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1519 rmidi->card, rmidi->device,
1520 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1521 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1522 list_del(&rmidi->list);
1523 mutex_unlock(&register_mutex);
1524 return err;
1525 }
1526 if (rmidi->ops && rmidi->ops->dev_register &&
1527 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1528 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1529 list_del(&rmidi->list);
1530 mutex_unlock(&register_mutex);
1531 return err;
1532 }
1533 #ifdef CONFIG_SND_OSSEMUL
1534 rmidi->ossreg = 0;
1535 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1536 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1537 rmidi->card, 0, &snd_rawmidi_f_ops,
1538 rmidi, name) < 0) {
1539 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1540 } else {
1541 rmidi->ossreg++;
1542 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1543 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1544 #endif
1545 }
1546 }
1547 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1548 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1549 rmidi->card, 1, &snd_rawmidi_f_ops,
1550 rmidi, name) < 0) {
1551 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1552 } else {
1553 rmidi->ossreg++;
1554 }
1555 }
1556 #endif /* CONFIG_SND_OSSEMUL */
1557 mutex_unlock(&register_mutex);
1558 sprintf(name, "midi%d", rmidi->device);
1559 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1560 if (entry) {
1561 entry->private_data = rmidi;
1562 entry->c.text.read_size = 1024;
1563 entry->c.text.read = snd_rawmidi_proc_info_read;
1564 if (snd_info_register(entry) < 0) {
1565 snd_info_free_entry(entry);
1566 entry = NULL;
1567 }
1568 }
1569 rmidi->proc_entry = entry;
1570 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1571 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1572 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1573 rmidi->seq_dev->private_data = rmidi;
1574 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1575 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1576 snd_device_register(rmidi->card, rmidi->seq_dev);
1577 }
1578 }
1579 #endif
1580 return 0;
1581 }
1582
1583 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1584 {
1585 struct snd_rawmidi *rmidi = device->device_data;
1586
1587 mutex_lock(&register_mutex);
1588 list_del_init(&rmidi->list);
1589 mutex_unlock(&register_mutex);
1590 return 0;
1591 }
1592
1593 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1594 {
1595 struct snd_rawmidi *rmidi = device->device_data;
1596
1597 snd_assert(rmidi != NULL, return -ENXIO);
1598 mutex_lock(&register_mutex);
1599 list_del(&rmidi->list);
1600 if (rmidi->proc_entry) {
1601 snd_info_unregister(rmidi->proc_entry);
1602 rmidi->proc_entry = NULL;
1603 }
1604 #ifdef CONFIG_SND_OSSEMUL
1605 if (rmidi->ossreg) {
1606 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1607 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1608 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1609 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1610 #endif
1611 }
1612 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1613 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1614 rmidi->ossreg = 0;
1615 }
1616 #endif /* CONFIG_SND_OSSEMUL */
1617 if (rmidi->ops && rmidi->ops->dev_unregister)
1618 rmidi->ops->dev_unregister(rmidi);
1619 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1620 mutex_unlock(&register_mutex);
1621 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1622 if (rmidi->seq_dev) {
1623 snd_device_free(rmidi->card, rmidi->seq_dev);
1624 rmidi->seq_dev = NULL;
1625 }
1626 #endif
1627 return snd_rawmidi_free(rmidi);
1628 }
1629
1630 /**
1631 * snd_rawmidi_set_ops - set the rawmidi operators
1632 * @rmidi: the rawmidi instance
1633 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1634 * @ops: the operator table
1635 *
1636 * Sets the rawmidi operators for the given stream direction.
1637 */
1638 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1639 struct snd_rawmidi_ops *ops)
1640 {
1641 struct list_head *list;
1642 struct snd_rawmidi_substream *substream;
1643
1644 list_for_each(list, &rmidi->streams[stream].substreams) {
1645 substream = list_entry(list, struct snd_rawmidi_substream, list);
1646 substream->ops = ops;
1647 }
1648 }
1649
1650 /*
1651 * ENTRY functions
1652 */
1653
1654 static int __init alsa_rawmidi_init(void)
1655 {
1656
1657 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1658 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1659 #ifdef CONFIG_SND_OSSEMUL
1660 { int i;
1661 /* check device map table */
1662 for (i = 0; i < SNDRV_CARDS; i++) {
1663 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1664 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1665 midi_map[i] = 0;
1666 }
1667 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1668 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1669 amidi_map[i] = 1;
1670 }
1671 }
1672 }
1673 #endif /* CONFIG_SND_OSSEMUL */
1674 return 0;
1675 }
1676
1677 static void __exit alsa_rawmidi_exit(void)
1678 {
1679 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1680 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1681 }
1682
1683 module_init(alsa_rawmidi_init)
1684 module_exit(alsa_rawmidi_exit)
1685
1686 EXPORT_SYMBOL(snd_rawmidi_output_params);
1687 EXPORT_SYMBOL(snd_rawmidi_input_params);
1688 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1689 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1690 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1691 EXPORT_SYMBOL(snd_rawmidi_receive);
1692 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1693 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1695 EXPORT_SYMBOL(snd_rawmidi_transmit);
1696 EXPORT_SYMBOL(snd_rawmidi_new);
1697 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1698 EXPORT_SYMBOL(snd_rawmidi_info_select);
1699 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1700 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1702 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
Stable & featurefull patchset based on Linus's git branch