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[ALSA] rawmidi: protect against invalid device number in snd_rawmidi_info_select()
[deliverable/linux.git] / sound / core / rawmidi.c
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/moduleparam.h>
32 #include <linux/delay.h>
33 #include <linux/wait.h>
34 #include <sound/rawmidi.h>
35 #include <sound/info.h>
36 #include <sound/control.h>
37 #include <sound/minors.h>
38 #include <sound/initval.h>
39
40 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
41 MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
42 MODULE_LICENSE("GPL");
43
44 #ifdef CONFIG_SND_OSSEMUL
45 static int midi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 0};
46 static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
47 module_param_array(midi_map, int, NULL, 0444);
48 MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
49 module_param_array(amidi_map, int, NULL, 0444);
50 MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
51 #endif /* CONFIG_SND_OSSEMUL */
52
53 static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
54 static int snd_rawmidi_dev_free(struct snd_device *device);
55 static int snd_rawmidi_dev_register(struct snd_device *device);
56 static int snd_rawmidi_dev_disconnect(struct snd_device *device);
57 static int snd_rawmidi_dev_unregister(struct snd_device *device);
58
59 static struct snd_rawmidi *snd_rawmidi_devices[SNDRV_CARDS * SNDRV_RAWMIDI_DEVICES];
60
61 static DECLARE_MUTEX(register_mutex);
62
63 static inline unsigned short snd_rawmidi_file_flags(struct file *file)
64 {
65 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
66 case FMODE_WRITE:
67 return SNDRV_RAWMIDI_LFLG_OUTPUT;
68 case FMODE_READ:
69 return SNDRV_RAWMIDI_LFLG_INPUT;
70 default:
71 return SNDRV_RAWMIDI_LFLG_OPEN;
72 }
73 }
74
75 static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
76 {
77 struct snd_rawmidi_runtime *runtime = substream->runtime;
78 return runtime->avail >= runtime->avail_min;
79 }
80
81 static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
82 size_t count)
83 {
84 struct snd_rawmidi_runtime *runtime = substream->runtime;
85 return runtime->avail >= runtime->avail_min &&
86 (!substream->append || runtime->avail >= count);
87 }
88
89 static void snd_rawmidi_input_event_tasklet(unsigned long data)
90 {
91 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
92 substream->runtime->event(substream);
93 }
94
95 static void snd_rawmidi_output_trigger_tasklet(unsigned long data)
96 {
97 struct snd_rawmidi_substream *substream = (struct snd_rawmidi_substream *)data;
98 substream->ops->trigger(substream, 1);
99 }
100
101 static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
102 {
103 struct snd_rawmidi_runtime *runtime;
104
105 if ((runtime = kzalloc(sizeof(*runtime), GFP_KERNEL)) == NULL)
106 return -ENOMEM;
107 spin_lock_init(&runtime->lock);
108 init_waitqueue_head(&runtime->sleep);
109 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
110 tasklet_init(&runtime->tasklet,
111 snd_rawmidi_input_event_tasklet,
112 (unsigned long)substream);
113 else
114 tasklet_init(&runtime->tasklet,
115 snd_rawmidi_output_trigger_tasklet,
116 (unsigned long)substream);
117 runtime->event = NULL;
118 runtime->buffer_size = PAGE_SIZE;
119 runtime->avail_min = 1;
120 if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
121 runtime->avail = 0;
122 else
123 runtime->avail = runtime->buffer_size;
124 if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
125 kfree(runtime);
126 return -ENOMEM;
127 }
128 runtime->appl_ptr = runtime->hw_ptr = 0;
129 substream->runtime = runtime;
130 return 0;
131 }
132
133 static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
134 {
135 struct snd_rawmidi_runtime *runtime = substream->runtime;
136
137 kfree(runtime->buffer);
138 kfree(runtime);
139 substream->runtime = NULL;
140 return 0;
141 }
142
143 static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,int up)
144 {
145 if (up) {
146 tasklet_hi_schedule(&substream->runtime->tasklet);
147 } else {
148 tasklet_kill(&substream->runtime->tasklet);
149 substream->ops->trigger(substream, 0);
150 }
151 }
152
153 static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
154 {
155 substream->ops->trigger(substream, up);
156 if (!up && substream->runtime->event)
157 tasklet_kill(&substream->runtime->tasklet);
158 }
159
160 int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
161 {
162 unsigned long flags;
163 struct snd_rawmidi_runtime *runtime = substream->runtime;
164
165 snd_rawmidi_output_trigger(substream, 0);
166 runtime->drain = 0;
167 spin_lock_irqsave(&runtime->lock, flags);
168 runtime->appl_ptr = runtime->hw_ptr = 0;
169 runtime->avail = runtime->buffer_size;
170 spin_unlock_irqrestore(&runtime->lock, flags);
171 return 0;
172 }
173
174 int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
175 {
176 int err;
177 long timeout;
178 struct snd_rawmidi_runtime *runtime = substream->runtime;
179
180 err = 0;
181 runtime->drain = 1;
182 timeout = wait_event_interruptible_timeout(runtime->sleep,
183 (runtime->avail >= runtime->buffer_size),
184 10*HZ);
185 if (signal_pending(current))
186 err = -ERESTARTSYS;
187 if (runtime->avail < runtime->buffer_size && !timeout) {
188 snd_printk(KERN_WARNING "rawmidi drain error (avail = %li, buffer_size = %li)\n", (long)runtime->avail, (long)runtime->buffer_size);
189 err = -EIO;
190 }
191 runtime->drain = 0;
192 if (err != -ERESTARTSYS) {
193 /* we need wait a while to make sure that Tx FIFOs are empty */
194 if (substream->ops->drain)
195 substream->ops->drain(substream);
196 else
197 msleep(50);
198 snd_rawmidi_drop_output(substream);
199 }
200 return err;
201 }
202
203 int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
204 {
205 unsigned long flags;
206 struct snd_rawmidi_runtime *runtime = substream->runtime;
207
208 snd_rawmidi_input_trigger(substream, 0);
209 runtime->drain = 0;
210 spin_lock_irqsave(&runtime->lock, flags);
211 runtime->appl_ptr = runtime->hw_ptr = 0;
212 runtime->avail = 0;
213 spin_unlock_irqrestore(&runtime->lock, flags);
214 return 0;
215 }
216
217 int snd_rawmidi_kernel_open(int cardnum, int device, int subdevice,
218 int mode, struct snd_rawmidi_file * rfile)
219 {
220 struct snd_rawmidi *rmidi;
221 struct list_head *list1, *list2;
222 struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
223 struct snd_rawmidi_runtime *input = NULL, *output = NULL;
224 int err;
225
226 if (rfile)
227 rfile->input = rfile->output = NULL;
228 rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
229 if (rmidi == NULL) {
230 err = -ENODEV;
231 goto __error1;
232 }
233 if (!try_module_get(rmidi->card->module)) {
234 err = -EFAULT;
235 goto __error1;
236 }
237 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
238 down(&rmidi->open_mutex);
239 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
240 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT)) {
241 err = -ENXIO;
242 goto __error;
243 }
244 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
245 err = -ENODEV;
246 goto __error;
247 }
248 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened >=
249 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_count) {
250 err = -EAGAIN;
251 goto __error;
252 }
253 }
254 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
255 if (!(rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT)) {
256 err = -ENXIO;
257 goto __error;
258 }
259 if (subdevice >= 0 && (unsigned int)subdevice >= rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
260 err = -ENODEV;
261 goto __error;
262 }
263 if (rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened >=
264 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_count) {
265 err = -EAGAIN;
266 goto __error;
267 }
268 }
269 list1 = rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams.next;
270 while (1) {
271 if (list1 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
272 sinput = NULL;
273 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
274 err = -EAGAIN;
275 goto __error;
276 }
277 break;
278 }
279 sinput = list_entry(list1, struct snd_rawmidi_substream, list);
280 if ((mode & SNDRV_RAWMIDI_LFLG_INPUT) && sinput->opened)
281 goto __nexti;
282 if (subdevice < 0 || (subdevice >= 0 && subdevice == sinput->number))
283 break;
284 __nexti:
285 list1 = list1->next;
286 }
287 list2 = rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams.next;
288 while (1) {
289 if (list2 == &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
290 soutput = NULL;
291 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
292 err = -EAGAIN;
293 goto __error;
294 }
295 break;
296 }
297 soutput = list_entry(list2, struct snd_rawmidi_substream, list);
298 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
299 if (mode & SNDRV_RAWMIDI_LFLG_APPEND) {
300 if (soutput->opened && !soutput->append)
301 goto __nexto;
302 } else {
303 if (soutput->opened)
304 goto __nexto;
305 }
306 }
307 if (subdevice < 0 || (subdevice >= 0 && subdevice == soutput->number))
308 break;
309 __nexto:
310 list2 = list2->next;
311 }
312 if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
313 if ((err = snd_rawmidi_runtime_create(sinput)) < 0)
314 goto __error;
315 input = sinput->runtime;
316 if ((err = sinput->ops->open(sinput)) < 0)
317 goto __error;
318 sinput->opened = 1;
319 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened++;
320 } else {
321 sinput = NULL;
322 }
323 if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
324 if (soutput->opened)
325 goto __skip_output;
326 if ((err = snd_rawmidi_runtime_create(soutput)) < 0) {
327 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
328 sinput->ops->close(sinput);
329 goto __error;
330 }
331 output = soutput->runtime;
332 if ((err = soutput->ops->open(soutput)) < 0) {
333 if (mode & SNDRV_RAWMIDI_LFLG_INPUT)
334 sinput->ops->close(sinput);
335 goto __error;
336 }
337 __skip_output:
338 soutput->opened = 1;
339 if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
340 soutput->append = 1;
341 if (soutput->use_count++ == 0)
342 soutput->active_sensing = 1;
343 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened++;
344 } else {
345 soutput = NULL;
346 }
347 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
348 up(&rmidi->open_mutex);
349 if (rfile) {
350 rfile->rmidi = rmidi;
351 rfile->input = sinput;
352 rfile->output = soutput;
353 }
354 return 0;
355
356 __error:
357 if (input != NULL)
358 snd_rawmidi_runtime_free(sinput);
359 if (output != NULL)
360 snd_rawmidi_runtime_free(soutput);
361 module_put(rmidi->card->module);
362 if (!(mode & SNDRV_RAWMIDI_LFLG_NOOPENLOCK))
363 up(&rmidi->open_mutex);
364 __error1:
365 return err;
366 }
367
368 static int snd_rawmidi_open(struct inode *inode, struct file *file)
369 {
370 int maj = imajor(inode);
371 int cardnum;
372 struct snd_card *card;
373 int device, subdevice;
374 unsigned short fflags;
375 int err;
376 struct snd_rawmidi *rmidi;
377 struct snd_rawmidi_file *rawmidi_file;
378 wait_queue_t wait;
379 struct list_head *list;
380 struct snd_ctl_file *kctl;
381
382 if (maj == snd_major) {
383 cardnum = SNDRV_MINOR_CARD(iminor(inode));
384 cardnum %= SNDRV_CARDS;
385 device = SNDRV_MINOR_DEVICE(iminor(inode)) - SNDRV_MINOR_RAWMIDI;
386 device %= SNDRV_MINOR_RAWMIDIS;
387 #ifdef CONFIG_SND_OSSEMUL
388 } else if (maj == SOUND_MAJOR) {
389 cardnum = SNDRV_MINOR_OSS_CARD(iminor(inode));
390 cardnum %= SNDRV_CARDS;
391 device = SNDRV_MINOR_OSS_DEVICE(iminor(inode)) == SNDRV_MINOR_OSS_MIDI ?
392 midi_map[cardnum] : amidi_map[cardnum];
393 #endif
394 } else
395 return -ENXIO;
396
397 rmidi = snd_rawmidi_devices[(cardnum * SNDRV_RAWMIDI_DEVICES) + device];
398 if (rmidi == NULL)
399 return -ENODEV;
400 #ifdef CONFIG_SND_OSSEMUL
401 if (maj == SOUND_MAJOR && !rmidi->ossreg)
402 return -ENXIO;
403 #endif
404 if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
405 return -EINVAL; /* invalid combination */
406 card = rmidi->card;
407 err = snd_card_file_add(card, file);
408 if (err < 0)
409 return -ENODEV;
410 fflags = snd_rawmidi_file_flags(file);
411 if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
412 fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
413 fflags |= SNDRV_RAWMIDI_LFLG_NOOPENLOCK;
414 rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
415 if (rawmidi_file == NULL) {
416 snd_card_file_remove(card, file);
417 return -ENOMEM;
418 }
419 init_waitqueue_entry(&wait, current);
420 add_wait_queue(&rmidi->open_wait, &wait);
421 down(&rmidi->open_mutex);
422 while (1) {
423 subdevice = -1;
424 down_read(&card->controls_rwsem);
425 list_for_each(list, &card->ctl_files) {
426 kctl = snd_ctl_file(list);
427 if (kctl->pid == current->pid) {
428 subdevice = kctl->prefer_rawmidi_subdevice;
429 break;
430 }
431 }
432 up_read(&card->controls_rwsem);
433 err = snd_rawmidi_kernel_open(cardnum, device, subdevice, fflags, rawmidi_file);
434 if (err >= 0)
435 break;
436 if (err == -EAGAIN) {
437 if (file->f_flags & O_NONBLOCK) {
438 err = -EBUSY;
439 break;
440 }
441 } else
442 break;
443 set_current_state(TASK_INTERRUPTIBLE);
444 up(&rmidi->open_mutex);
445 schedule();
446 down(&rmidi->open_mutex);
447 if (signal_pending(current)) {
448 err = -ERESTARTSYS;
449 break;
450 }
451 }
452 #ifdef CONFIG_SND_OSSEMUL
453 if (rawmidi_file->input && rawmidi_file->input->runtime)
454 rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
455 if (rawmidi_file->output && rawmidi_file->output->runtime)
456 rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
457 #endif
458 remove_wait_queue(&rmidi->open_wait, &wait);
459 if (err >= 0) {
460 file->private_data = rawmidi_file;
461 } else {
462 snd_card_file_remove(card, file);
463 kfree(rawmidi_file);
464 }
465 up(&rmidi->open_mutex);
466 return err;
467 }
468
469 int snd_rawmidi_kernel_release(struct snd_rawmidi_file * rfile)
470 {
471 struct snd_rawmidi *rmidi;
472 struct snd_rawmidi_substream *substream;
473 struct snd_rawmidi_runtime *runtime;
474
475 snd_assert(rfile != NULL, return -ENXIO);
476 snd_assert(rfile->input != NULL || rfile->output != NULL, return -ENXIO);
477 rmidi = rfile->rmidi;
478 down(&rmidi->open_mutex);
479 if (rfile->input != NULL) {
480 substream = rfile->input;
481 rfile->input = NULL;
482 runtime = substream->runtime;
483 snd_rawmidi_input_trigger(substream, 0);
484 substream->ops->close(substream);
485 if (runtime->private_free != NULL)
486 runtime->private_free(substream);
487 snd_rawmidi_runtime_free(substream);
488 substream->opened = 0;
489 rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substream_opened--;
490 }
491 if (rfile->output != NULL) {
492 substream = rfile->output;
493 rfile->output = NULL;
494 if (--substream->use_count == 0) {
495 runtime = substream->runtime;
496 if (substream->active_sensing) {
497 unsigned char buf = 0xfe;
498 /* sending single active sensing message to shut the device up */
499 snd_rawmidi_kernel_write(substream, &buf, 1);
500 }
501 if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
502 snd_rawmidi_output_trigger(substream, 0);
503 substream->ops->close(substream);
504 if (runtime->private_free != NULL)
505 runtime->private_free(substream);
506 snd_rawmidi_runtime_free(substream);
507 substream->opened = 0;
508 substream->append = 0;
509 }
510 rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substream_opened--;
511 }
512 up(&rmidi->open_mutex);
513 module_put(rmidi->card->module);
514 return 0;
515 }
516
517 static int snd_rawmidi_release(struct inode *inode, struct file *file)
518 {
519 struct snd_rawmidi_file *rfile;
520 struct snd_rawmidi *rmidi;
521 int err;
522
523 rfile = file->private_data;
524 err = snd_rawmidi_kernel_release(rfile);
525 rmidi = rfile->rmidi;
526 wake_up(&rmidi->open_wait);
527 kfree(rfile);
528 snd_card_file_remove(rmidi->card, file);
529 return err;
530 }
531
532 int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
533 struct snd_rawmidi_info *info)
534 {
535 struct snd_rawmidi *rmidi;
536
537 if (substream == NULL)
538 return -ENODEV;
539 rmidi = substream->rmidi;
540 memset(info, 0, sizeof(*info));
541 info->card = rmidi->card->number;
542 info->device = rmidi->device;
543 info->subdevice = substream->number;
544 info->stream = substream->stream;
545 info->flags = rmidi->info_flags;
546 strcpy(info->id, rmidi->id);
547 strcpy(info->name, rmidi->name);
548 strcpy(info->subname, substream->name);
549 info->subdevices_count = substream->pstr->substream_count;
550 info->subdevices_avail = (substream->pstr->substream_count -
551 substream->pstr->substream_opened);
552 return 0;
553 }
554
555 static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
556 struct snd_rawmidi_info __user * _info)
557 {
558 struct snd_rawmidi_info info;
559 int err;
560 if ((err = snd_rawmidi_info(substream, &info)) < 0)
561 return err;
562 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
563 return -EFAULT;
564 return 0;
565 }
566
567 int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
568 {
569 struct snd_rawmidi *rmidi;
570 struct snd_rawmidi_str *pstr;
571 struct snd_rawmidi_substream *substream;
572 struct list_head *list;
573 if (info->device >= SNDRV_RAWMIDI_DEVICES)
574 return -ENXIO;
575 rmidi = snd_rawmidi_devices[card->number * SNDRV_RAWMIDI_DEVICES + info->device];
576 if (!rmidi)
577 return -ENXIO;
578 if (info->stream < 0 || info->stream > 1)
579 return -EINVAL;
580 pstr = &rmidi->streams[info->stream];
581 if (pstr->substream_count == 0)
582 return -ENOENT;
583 if (info->subdevice >= pstr->substream_count)
584 return -ENXIO;
585 list_for_each(list, &pstr->substreams) {
586 substream = list_entry(list, struct snd_rawmidi_substream, list);
587 if ((unsigned int)substream->number == info->subdevice)
588 return snd_rawmidi_info(substream, info);
589 }
590 return -ENXIO;
591 }
592
593 static int snd_rawmidi_info_select_user(struct snd_card *card,
594 struct snd_rawmidi_info __user *_info)
595 {
596 int err;
597 struct snd_rawmidi_info info;
598 if (get_user(info.device, &_info->device))
599 return -EFAULT;
600 if (get_user(info.stream, &_info->stream))
601 return -EFAULT;
602 if (get_user(info.subdevice, &_info->subdevice))
603 return -EFAULT;
604 if ((err = snd_rawmidi_info_select(card, &info)) < 0)
605 return err;
606 if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
607 return -EFAULT;
608 return 0;
609 }
610
611 int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
612 struct snd_rawmidi_params * params)
613 {
614 char *newbuf;
615 struct snd_rawmidi_runtime *runtime = substream->runtime;
616
617 if (substream->append && substream->use_count > 1)
618 return -EBUSY;
619 snd_rawmidi_drain_output(substream);
620 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
621 return -EINVAL;
622 }
623 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
624 return -EINVAL;
625 }
626 if (params->buffer_size != runtime->buffer_size) {
627 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
628 return -ENOMEM;
629 kfree(runtime->buffer);
630 runtime->buffer = newbuf;
631 runtime->buffer_size = params->buffer_size;
632 }
633 runtime->avail_min = params->avail_min;
634 substream->active_sensing = !params->no_active_sensing;
635 return 0;
636 }
637
638 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
639 struct snd_rawmidi_params * params)
640 {
641 char *newbuf;
642 struct snd_rawmidi_runtime *runtime = substream->runtime;
643
644 snd_rawmidi_drain_input(substream);
645 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
646 return -EINVAL;
647 }
648 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
649 return -EINVAL;
650 }
651 if (params->buffer_size != runtime->buffer_size) {
652 if ((newbuf = (char *) kmalloc(params->buffer_size, GFP_KERNEL)) == NULL)
653 return -ENOMEM;
654 kfree(runtime->buffer);
655 runtime->buffer = newbuf;
656 runtime->buffer_size = params->buffer_size;
657 }
658 runtime->avail_min = params->avail_min;
659 return 0;
660 }
661
662 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
663 struct snd_rawmidi_status * status)
664 {
665 struct snd_rawmidi_runtime *runtime = substream->runtime;
666
667 memset(status, 0, sizeof(*status));
668 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
669 spin_lock_irq(&runtime->lock);
670 status->avail = runtime->avail;
671 spin_unlock_irq(&runtime->lock);
672 return 0;
673 }
674
675 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
676 struct snd_rawmidi_status * status)
677 {
678 struct snd_rawmidi_runtime *runtime = substream->runtime;
679
680 memset(status, 0, sizeof(*status));
681 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
682 spin_lock_irq(&runtime->lock);
683 status->avail = runtime->avail;
684 status->xruns = runtime->xruns;
685 runtime->xruns = 0;
686 spin_unlock_irq(&runtime->lock);
687 return 0;
688 }
689
690 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
691 {
692 struct snd_rawmidi_file *rfile;
693 void __user *argp = (void __user *)arg;
694
695 rfile = file->private_data;
696 if (((cmd >> 8) & 0xff) != 'W')
697 return -ENOTTY;
698 switch (cmd) {
699 case SNDRV_RAWMIDI_IOCTL_PVERSION:
700 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
701 case SNDRV_RAWMIDI_IOCTL_INFO:
702 {
703 int stream;
704 struct snd_rawmidi_info __user *info = argp;
705 if (get_user(stream, &info->stream))
706 return -EFAULT;
707 switch (stream) {
708 case SNDRV_RAWMIDI_STREAM_INPUT:
709 return snd_rawmidi_info_user(rfile->input, info);
710 case SNDRV_RAWMIDI_STREAM_OUTPUT:
711 return snd_rawmidi_info_user(rfile->output, info);
712 default:
713 return -EINVAL;
714 }
715 }
716 case SNDRV_RAWMIDI_IOCTL_PARAMS:
717 {
718 struct snd_rawmidi_params params;
719 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
720 return -EFAULT;
721 switch (params.stream) {
722 case SNDRV_RAWMIDI_STREAM_OUTPUT:
723 if (rfile->output == NULL)
724 return -EINVAL;
725 return snd_rawmidi_output_params(rfile->output, &params);
726 case SNDRV_RAWMIDI_STREAM_INPUT:
727 if (rfile->input == NULL)
728 return -EINVAL;
729 return snd_rawmidi_input_params(rfile->input, &params);
730 default:
731 return -EINVAL;
732 }
733 }
734 case SNDRV_RAWMIDI_IOCTL_STATUS:
735 {
736 int err = 0;
737 struct snd_rawmidi_status status;
738 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
739 return -EFAULT;
740 switch (status.stream) {
741 case SNDRV_RAWMIDI_STREAM_OUTPUT:
742 if (rfile->output == NULL)
743 return -EINVAL;
744 err = snd_rawmidi_output_status(rfile->output, &status);
745 break;
746 case SNDRV_RAWMIDI_STREAM_INPUT:
747 if (rfile->input == NULL)
748 return -EINVAL;
749 err = snd_rawmidi_input_status(rfile->input, &status);
750 break;
751 default:
752 return -EINVAL;
753 }
754 if (err < 0)
755 return err;
756 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
757 return -EFAULT;
758 return 0;
759 }
760 case SNDRV_RAWMIDI_IOCTL_DROP:
761 {
762 int val;
763 if (get_user(val, (int __user *) argp))
764 return -EFAULT;
765 switch (val) {
766 case SNDRV_RAWMIDI_STREAM_OUTPUT:
767 if (rfile->output == NULL)
768 return -EINVAL;
769 return snd_rawmidi_drop_output(rfile->output);
770 default:
771 return -EINVAL;
772 }
773 }
774 case SNDRV_RAWMIDI_IOCTL_DRAIN:
775 {
776 int val;
777 if (get_user(val, (int __user *) argp))
778 return -EFAULT;
779 switch (val) {
780 case SNDRV_RAWMIDI_STREAM_OUTPUT:
781 if (rfile->output == NULL)
782 return -EINVAL;
783 return snd_rawmidi_drain_output(rfile->output);
784 case SNDRV_RAWMIDI_STREAM_INPUT:
785 if (rfile->input == NULL)
786 return -EINVAL;
787 return snd_rawmidi_drain_input(rfile->input);
788 default:
789 return -EINVAL;
790 }
791 }
792 #ifdef CONFIG_SND_DEBUG
793 default:
794 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
795 #endif
796 }
797 return -ENOTTY;
798 }
799
800 static int snd_rawmidi_control_ioctl(struct snd_card *card,
801 struct snd_ctl_file *control,
802 unsigned int cmd,
803 unsigned long arg)
804 {
805 void __user *argp = (void __user *)arg;
806 unsigned int tmp;
807
808 tmp = card->number * SNDRV_RAWMIDI_DEVICES;
809 switch (cmd) {
810 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
811 {
812 int device;
813
814 if (get_user(device, (int __user *)argp))
815 return -EFAULT;
816 device = device < 0 ? 0 : device + 1;
817 while (device < SNDRV_RAWMIDI_DEVICES) {
818 if (snd_rawmidi_devices[tmp + device])
819 break;
820 device++;
821 }
822 if (device == SNDRV_RAWMIDI_DEVICES)
823 device = -1;
824 if (put_user(device, (int __user *)argp))
825 return -EFAULT;
826 return 0;
827 }
828 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
829 {
830 int val;
831
832 if (get_user(val, (int __user *)argp))
833 return -EFAULT;
834 control->prefer_rawmidi_subdevice = val;
835 return 0;
836 }
837 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
838 return snd_rawmidi_info_select_user(card, argp);
839 }
840 return -ENOIOCTLCMD;
841 }
842
843 /**
844 * snd_rawmidi_receive - receive the input data from the device
845 * @substream: the rawmidi substream
846 * @buffer: the buffer pointer
847 * @count: the data size to read
848 *
849 * Reads the data from the internal buffer.
850 *
851 * Returns the size of read data, or a negative error code on failure.
852 */
853 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
854 const unsigned char *buffer, int count)
855 {
856 unsigned long flags;
857 int result = 0, count1;
858 struct snd_rawmidi_runtime *runtime = substream->runtime;
859
860 if (runtime->buffer == NULL) {
861 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
862 return -EINVAL;
863 }
864 spin_lock_irqsave(&runtime->lock, flags);
865 if (count == 1) { /* special case, faster code */
866 substream->bytes++;
867 if (runtime->avail < runtime->buffer_size) {
868 runtime->buffer[runtime->hw_ptr++] = buffer[0];
869 runtime->hw_ptr %= runtime->buffer_size;
870 runtime->avail++;
871 result++;
872 } else {
873 runtime->xruns++;
874 }
875 } else {
876 substream->bytes += count;
877 count1 = runtime->buffer_size - runtime->hw_ptr;
878 if (count1 > count)
879 count1 = count;
880 if (count1 > (int)(runtime->buffer_size - runtime->avail))
881 count1 = runtime->buffer_size - runtime->avail;
882 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
883 runtime->hw_ptr += count1;
884 runtime->hw_ptr %= runtime->buffer_size;
885 runtime->avail += count1;
886 count -= count1;
887 result += count1;
888 if (count > 0) {
889 buffer += count1;
890 count1 = count;
891 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
892 count1 = runtime->buffer_size - runtime->avail;
893 runtime->xruns += count - count1;
894 }
895 if (count1 > 0) {
896 memcpy(runtime->buffer, buffer, count1);
897 runtime->hw_ptr = count1;
898 runtime->avail += count1;
899 result += count1;
900 }
901 }
902 }
903 if (result > 0) {
904 if (runtime->event)
905 tasklet_hi_schedule(&runtime->tasklet);
906 else if (snd_rawmidi_ready(substream))
907 wake_up(&runtime->sleep);
908 }
909 spin_unlock_irqrestore(&runtime->lock, flags);
910 return result;
911 }
912
913 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
914 unsigned char *buf, long count, int kernel)
915 {
916 unsigned long flags;
917 long result = 0, count1;
918 struct snd_rawmidi_runtime *runtime = substream->runtime;
919
920 while (count > 0 && runtime->avail) {
921 count1 = runtime->buffer_size - runtime->appl_ptr;
922 if (count1 > count)
923 count1 = count;
924 spin_lock_irqsave(&runtime->lock, flags);
925 if (count1 > (int)runtime->avail)
926 count1 = runtime->avail;
927 if (kernel) {
928 memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
929 } else {
930 spin_unlock_irqrestore(&runtime->lock, flags);
931 if (copy_to_user((char __user *)buf + result,
932 runtime->buffer + runtime->appl_ptr, count1)) {
933 return result > 0 ? result : -EFAULT;
934 }
935 spin_lock_irqsave(&runtime->lock, flags);
936 }
937 runtime->appl_ptr += count1;
938 runtime->appl_ptr %= runtime->buffer_size;
939 runtime->avail -= count1;
940 spin_unlock_irqrestore(&runtime->lock, flags);
941 result += count1;
942 count -= count1;
943 }
944 return result;
945 }
946
947 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
948 unsigned char *buf, long count)
949 {
950 snd_rawmidi_input_trigger(substream, 1);
951 return snd_rawmidi_kernel_read1(substream, buf, count, 1);
952 }
953
954 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
955 loff_t *offset)
956 {
957 long result;
958 int count1;
959 struct snd_rawmidi_file *rfile;
960 struct snd_rawmidi_substream *substream;
961 struct snd_rawmidi_runtime *runtime;
962
963 rfile = file->private_data;
964 substream = rfile->input;
965 if (substream == NULL)
966 return -EIO;
967 runtime = substream->runtime;
968 snd_rawmidi_input_trigger(substream, 1);
969 result = 0;
970 while (count > 0) {
971 spin_lock_irq(&runtime->lock);
972 while (!snd_rawmidi_ready(substream)) {
973 wait_queue_t wait;
974 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
975 spin_unlock_irq(&runtime->lock);
976 return result > 0 ? result : -EAGAIN;
977 }
978 init_waitqueue_entry(&wait, current);
979 add_wait_queue(&runtime->sleep, &wait);
980 set_current_state(TASK_INTERRUPTIBLE);
981 spin_unlock_irq(&runtime->lock);
982 schedule();
983 remove_wait_queue(&runtime->sleep, &wait);
984 if (signal_pending(current))
985 return result > 0 ? result : -ERESTARTSYS;
986 if (!runtime->avail)
987 return result > 0 ? result : -EIO;
988 spin_lock_irq(&runtime->lock);
989 }
990 spin_unlock_irq(&runtime->lock);
991 count1 = snd_rawmidi_kernel_read1(substream,
992 (unsigned char __force *)buf,
993 count, 0);
994 if (count1 < 0)
995 return result > 0 ? result : count1;
996 result += count1;
997 buf += count1;
998 count -= count1;
999 }
1000 return result;
1001 }
1002
1003 /**
1004 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1005 * @substream: the rawmidi substream
1006 *
1007 * Returns 1 if the internal output buffer is empty, 0 if not.
1008 */
1009 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1010 {
1011 struct snd_rawmidi_runtime *runtime = substream->runtime;
1012 int result;
1013 unsigned long flags;
1014
1015 if (runtime->buffer == NULL) {
1016 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1017 return 1;
1018 }
1019 spin_lock_irqsave(&runtime->lock, flags);
1020 result = runtime->avail >= runtime->buffer_size;
1021 spin_unlock_irqrestore(&runtime->lock, flags);
1022 return result;
1023 }
1024
1025 /**
1026 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1027 * @substream: the rawmidi substream
1028 * @buffer: the buffer pointer
1029 * @count: data size to transfer
1030 *
1031 * Copies data from the internal output buffer to the given buffer.
1032 *
1033 * Call this in the interrupt handler when the midi output is ready,
1034 * and call snd_rawmidi_transmit_ack() after the transmission is
1035 * finished.
1036 *
1037 * Returns the size of copied data, or a negative error code on failure.
1038 */
1039 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1040 unsigned char *buffer, int count)
1041 {
1042 unsigned long flags;
1043 int result, count1;
1044 struct snd_rawmidi_runtime *runtime = substream->runtime;
1045
1046 if (runtime->buffer == NULL) {
1047 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1048 return -EINVAL;
1049 }
1050 result = 0;
1051 spin_lock_irqsave(&runtime->lock, flags);
1052 if (runtime->avail >= runtime->buffer_size) {
1053 /* warning: lowlevel layer MUST trigger down the hardware */
1054 goto __skip;
1055 }
1056 if (count == 1) { /* special case, faster code */
1057 *buffer = runtime->buffer[runtime->hw_ptr];
1058 result++;
1059 } else {
1060 count1 = runtime->buffer_size - runtime->hw_ptr;
1061 if (count1 > count)
1062 count1 = count;
1063 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1064 count1 = runtime->buffer_size - runtime->avail;
1065 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1066 count -= count1;
1067 result += count1;
1068 if (count > 0) {
1069 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1070 count = runtime->buffer_size - runtime->avail - count1;
1071 memcpy(buffer + count1, runtime->buffer, count);
1072 result += count;
1073 }
1074 }
1075 __skip:
1076 spin_unlock_irqrestore(&runtime->lock, flags);
1077 return result;
1078 }
1079
1080 /**
1081 * snd_rawmidi_transmit_ack - acknowledge the transmission
1082 * @substream: the rawmidi substream
1083 * @count: the tranferred count
1084 *
1085 * Advances the hardware pointer for the internal output buffer with
1086 * the given size and updates the condition.
1087 * Call after the transmission is finished.
1088 *
1089 * Returns the advanced size if successful, or a negative error code on failure.
1090 */
1091 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1092 {
1093 unsigned long flags;
1094 struct snd_rawmidi_runtime *runtime = substream->runtime;
1095
1096 if (runtime->buffer == NULL) {
1097 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1098 return -EINVAL;
1099 }
1100 spin_lock_irqsave(&runtime->lock, flags);
1101 snd_assert(runtime->avail + count <= runtime->buffer_size, );
1102 runtime->hw_ptr += count;
1103 runtime->hw_ptr %= runtime->buffer_size;
1104 runtime->avail += count;
1105 substream->bytes += count;
1106 if (count > 0) {
1107 if (runtime->drain || snd_rawmidi_ready(substream))
1108 wake_up(&runtime->sleep);
1109 }
1110 spin_unlock_irqrestore(&runtime->lock, flags);
1111 return count;
1112 }
1113
1114 /**
1115 * snd_rawmidi_transmit - copy from the buffer to the device
1116 * @substream: the rawmidi substream
1117 * @buffer: the buffer pointer
1118 * @count: the data size to transfer
1119 *
1120 * Copies data from the buffer to the device and advances the pointer.
1121 *
1122 * Returns the copied size if successful, or a negative error code on failure.
1123 */
1124 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1125 unsigned char *buffer, int count)
1126 {
1127 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1128 if (count < 0)
1129 return count;
1130 return snd_rawmidi_transmit_ack(substream, count);
1131 }
1132
1133 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1134 const unsigned char *buf, long count, int kernel)
1135 {
1136 unsigned long flags;
1137 long count1, result;
1138 struct snd_rawmidi_runtime *runtime = substream->runtime;
1139
1140 snd_assert(buf != NULL, return -EINVAL);
1141 snd_assert(runtime->buffer != NULL, return -EINVAL);
1142
1143 result = 0;
1144 spin_lock_irqsave(&runtime->lock, flags);
1145 if (substream->append) {
1146 if ((long)runtime->avail < count) {
1147 spin_unlock_irqrestore(&runtime->lock, flags);
1148 return -EAGAIN;
1149 }
1150 }
1151 while (count > 0 && runtime->avail > 0) {
1152 count1 = runtime->buffer_size - runtime->appl_ptr;
1153 if (count1 > count)
1154 count1 = count;
1155 if (count1 > (long)runtime->avail)
1156 count1 = runtime->avail;
1157 if (kernel) {
1158 memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1159 } else {
1160 spin_unlock_irqrestore(&runtime->lock, flags);
1161 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1162 (char __user *)buf, count1)) {
1163 spin_lock_irqsave(&runtime->lock, flags);
1164 result = result > 0 ? result : -EFAULT;
1165 goto __end;
1166 }
1167 spin_lock_irqsave(&runtime->lock, flags);
1168 }
1169 runtime->appl_ptr += count1;
1170 runtime->appl_ptr %= runtime->buffer_size;
1171 runtime->avail -= count1;
1172 result += count1;
1173 buf += count1;
1174 count -= count1;
1175 }
1176 __end:
1177 count1 = runtime->avail < runtime->buffer_size;
1178 spin_unlock_irqrestore(&runtime->lock, flags);
1179 if (count1)
1180 snd_rawmidi_output_trigger(substream, 1);
1181 return result;
1182 }
1183
1184 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1185 const unsigned char *buf, long count)
1186 {
1187 return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1188 }
1189
1190 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1191 size_t count, loff_t *offset)
1192 {
1193 long result, timeout;
1194 int count1;
1195 struct snd_rawmidi_file *rfile;
1196 struct snd_rawmidi_runtime *runtime;
1197 struct snd_rawmidi_substream *substream;
1198
1199 rfile = file->private_data;
1200 substream = rfile->output;
1201 runtime = substream->runtime;
1202 /* we cannot put an atomic message to our buffer */
1203 if (substream->append && count > runtime->buffer_size)
1204 return -EIO;
1205 result = 0;
1206 while (count > 0) {
1207 spin_lock_irq(&runtime->lock);
1208 while (!snd_rawmidi_ready_append(substream, count)) {
1209 wait_queue_t wait;
1210 if (file->f_flags & O_NONBLOCK) {
1211 spin_unlock_irq(&runtime->lock);
1212 return result > 0 ? result : -EAGAIN;
1213 }
1214 init_waitqueue_entry(&wait, current);
1215 add_wait_queue(&runtime->sleep, &wait);
1216 set_current_state(TASK_INTERRUPTIBLE);
1217 spin_unlock_irq(&runtime->lock);
1218 timeout = schedule_timeout(30 * HZ);
1219 remove_wait_queue(&runtime->sleep, &wait);
1220 if (signal_pending(current))
1221 return result > 0 ? result : -ERESTARTSYS;
1222 if (!runtime->avail && !timeout)
1223 return result > 0 ? result : -EIO;
1224 spin_lock_irq(&runtime->lock);
1225 }
1226 spin_unlock_irq(&runtime->lock);
1227 count1 = snd_rawmidi_kernel_write1(substream,
1228 (unsigned char __force *)buf,
1229 count, 0);
1230 if (count1 < 0)
1231 return result > 0 ? result : count1;
1232 result += count1;
1233 buf += count1;
1234 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1235 break;
1236 count -= count1;
1237 }
1238 if (file->f_flags & O_SYNC) {
1239 spin_lock_irq(&runtime->lock);
1240 while (runtime->avail != runtime->buffer_size) {
1241 wait_queue_t wait;
1242 unsigned int last_avail = runtime->avail;
1243 init_waitqueue_entry(&wait, current);
1244 add_wait_queue(&runtime->sleep, &wait);
1245 set_current_state(TASK_INTERRUPTIBLE);
1246 spin_unlock_irq(&runtime->lock);
1247 timeout = schedule_timeout(30 * HZ);
1248 remove_wait_queue(&runtime->sleep, &wait);
1249 if (signal_pending(current))
1250 return result > 0 ? result : -ERESTARTSYS;
1251 if (runtime->avail == last_avail && !timeout)
1252 return result > 0 ? result : -EIO;
1253 spin_lock_irq(&runtime->lock);
1254 }
1255 spin_unlock_irq(&runtime->lock);
1256 }
1257 return result;
1258 }
1259
1260 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1261 {
1262 struct snd_rawmidi_file *rfile;
1263 struct snd_rawmidi_runtime *runtime;
1264 unsigned int mask;
1265
1266 rfile = file->private_data;
1267 if (rfile->input != NULL) {
1268 runtime = rfile->input->runtime;
1269 snd_rawmidi_input_trigger(rfile->input, 1);
1270 poll_wait(file, &runtime->sleep, wait);
1271 }
1272 if (rfile->output != NULL) {
1273 runtime = rfile->output->runtime;
1274 poll_wait(file, &runtime->sleep, wait);
1275 }
1276 mask = 0;
1277 if (rfile->input != NULL) {
1278 if (snd_rawmidi_ready(rfile->input))
1279 mask |= POLLIN | POLLRDNORM;
1280 }
1281 if (rfile->output != NULL) {
1282 if (snd_rawmidi_ready(rfile->output))
1283 mask |= POLLOUT | POLLWRNORM;
1284 }
1285 return mask;
1286 }
1287
1288 /*
1289 */
1290 #ifdef CONFIG_COMPAT
1291 #include "rawmidi_compat.c"
1292 #else
1293 #define snd_rawmidi_ioctl_compat NULL
1294 #endif
1295
1296 /*
1297
1298 */
1299
1300 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1301 struct snd_info_buffer *buffer)
1302 {
1303 struct snd_rawmidi *rmidi;
1304 struct snd_rawmidi_substream *substream;
1305 struct snd_rawmidi_runtime *runtime;
1306 struct list_head *list;
1307
1308 rmidi = entry->private_data;
1309 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1310 down(&rmidi->open_mutex);
1311 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1312 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1313 substream = list_entry(list, struct snd_rawmidi_substream, list);
1314 snd_iprintf(buffer,
1315 "Output %d\n"
1316 " Tx bytes : %lu\n",
1317 substream->number,
1318 (unsigned long) substream->bytes);
1319 if (substream->opened) {
1320 runtime = substream->runtime;
1321 snd_iprintf(buffer,
1322 " Mode : %s\n"
1323 " Buffer size : %lu\n"
1324 " Avail : %lu\n",
1325 runtime->oss ? "OSS compatible" : "native",
1326 (unsigned long) runtime->buffer_size,
1327 (unsigned long) runtime->avail);
1328 }
1329 }
1330 }
1331 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1332 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1333 substream = list_entry(list, struct snd_rawmidi_substream, list);
1334 snd_iprintf(buffer,
1335 "Input %d\n"
1336 " Rx bytes : %lu\n",
1337 substream->number,
1338 (unsigned long) substream->bytes);
1339 if (substream->opened) {
1340 runtime = substream->runtime;
1341 snd_iprintf(buffer,
1342 " Buffer size : %lu\n"
1343 " Avail : %lu\n"
1344 " Overruns : %lu\n",
1345 (unsigned long) runtime->buffer_size,
1346 (unsigned long) runtime->avail,
1347 (unsigned long) runtime->xruns);
1348 }
1349 }
1350 }
1351 up(&rmidi->open_mutex);
1352 }
1353
1354 /*
1355 * Register functions
1356 */
1357
1358 static struct file_operations snd_rawmidi_f_ops =
1359 {
1360 .owner = THIS_MODULE,
1361 .read = snd_rawmidi_read,
1362 .write = snd_rawmidi_write,
1363 .open = snd_rawmidi_open,
1364 .release = snd_rawmidi_release,
1365 .poll = snd_rawmidi_poll,
1366 .unlocked_ioctl = snd_rawmidi_ioctl,
1367 .compat_ioctl = snd_rawmidi_ioctl_compat,
1368 };
1369
1370 static struct snd_minor snd_rawmidi_reg =
1371 {
1372 .comment = "raw midi",
1373 .f_ops = &snd_rawmidi_f_ops,
1374 };
1375
1376 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1377 struct snd_rawmidi_str *stream,
1378 int direction,
1379 int count)
1380 {
1381 struct snd_rawmidi_substream *substream;
1382 int idx;
1383
1384 INIT_LIST_HEAD(&stream->substreams);
1385 for (idx = 0; idx < count; idx++) {
1386 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1387 if (substream == NULL) {
1388 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1389 return -ENOMEM;
1390 }
1391 substream->stream = direction;
1392 substream->number = idx;
1393 substream->rmidi = rmidi;
1394 substream->pstr = stream;
1395 list_add_tail(&substream->list, &stream->substreams);
1396 stream->substream_count++;
1397 }
1398 return 0;
1399 }
1400
1401 /**
1402 * snd_rawmidi_new - create a rawmidi instance
1403 * @card: the card instance
1404 * @id: the id string
1405 * @device: the device index
1406 * @output_count: the number of output streams
1407 * @input_count: the number of input streams
1408 * @rrawmidi: the pointer to store the new rawmidi instance
1409 *
1410 * Creates a new rawmidi instance.
1411 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1412 *
1413 * Returns zero if successful, or a negative error code on failure.
1414 */
1415 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1416 int output_count, int input_count,
1417 struct snd_rawmidi ** rrawmidi)
1418 {
1419 struct snd_rawmidi *rmidi;
1420 int err;
1421 static struct snd_device_ops ops = {
1422 .dev_free = snd_rawmidi_dev_free,
1423 .dev_register = snd_rawmidi_dev_register,
1424 .dev_disconnect = snd_rawmidi_dev_disconnect,
1425 .dev_unregister = snd_rawmidi_dev_unregister
1426 };
1427
1428 snd_assert(rrawmidi != NULL, return -EINVAL);
1429 *rrawmidi = NULL;
1430 snd_assert(card != NULL, return -ENXIO);
1431 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1432 if (rmidi == NULL) {
1433 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1434 return -ENOMEM;
1435 }
1436 rmidi->card = card;
1437 rmidi->device = device;
1438 init_MUTEX(&rmidi->open_mutex);
1439 init_waitqueue_head(&rmidi->open_wait);
1440 if (id != NULL)
1441 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1442 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1443 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1444 SNDRV_RAWMIDI_STREAM_INPUT,
1445 input_count)) < 0) {
1446 snd_rawmidi_free(rmidi);
1447 return err;
1448 }
1449 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1450 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1451 SNDRV_RAWMIDI_STREAM_OUTPUT,
1452 output_count)) < 0) {
1453 snd_rawmidi_free(rmidi);
1454 return err;
1455 }
1456 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1457 snd_rawmidi_free(rmidi);
1458 return err;
1459 }
1460 *rrawmidi = rmidi;
1461 return 0;
1462 }
1463
1464 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1465 {
1466 struct snd_rawmidi_substream *substream;
1467
1468 while (!list_empty(&stream->substreams)) {
1469 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1470 list_del(&substream->list);
1471 kfree(substream);
1472 }
1473 }
1474
1475 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1476 {
1477 snd_assert(rmidi != NULL, return -ENXIO);
1478 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1479 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1480 if (rmidi->private_free)
1481 rmidi->private_free(rmidi);
1482 kfree(rmidi);
1483 return 0;
1484 }
1485
1486 static int snd_rawmidi_dev_free(struct snd_device *device)
1487 {
1488 struct snd_rawmidi *rmidi = device->device_data;
1489 return snd_rawmidi_free(rmidi);
1490 }
1491
1492 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1493 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1494 {
1495 struct snd_rawmidi *rmidi = device->private_data;
1496 rmidi->seq_dev = NULL;
1497 }
1498 #endif
1499
1500 static int snd_rawmidi_dev_register(struct snd_device *device)
1501 {
1502 int idx, err;
1503 struct snd_info_entry *entry;
1504 char name[16];
1505 struct snd_rawmidi *rmidi = device->device_data;
1506
1507 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1508 return -ENOMEM;
1509 down(&register_mutex);
1510 idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1511 if (snd_rawmidi_devices[idx] != NULL) {
1512 up(&register_mutex);
1513 return -EBUSY;
1514 }
1515 snd_rawmidi_devices[idx] = rmidi;
1516 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1517 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1518 rmidi->card, rmidi->device,
1519 &snd_rawmidi_reg, name)) < 0) {
1520 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1521 snd_rawmidi_devices[idx] = NULL;
1522 up(&register_mutex);
1523 return err;
1524 }
1525 if (rmidi->ops && rmidi->ops->dev_register &&
1526 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1527 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1528 snd_rawmidi_devices[idx] = NULL;
1529 up(&register_mutex);
1530 return err;
1531 }
1532 #ifdef CONFIG_SND_OSSEMUL
1533 rmidi->ossreg = 0;
1534 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1535 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1536 rmidi->card, 0, &snd_rawmidi_reg, name) < 0) {
1537 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1538 } else {
1539 rmidi->ossreg++;
1540 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1541 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1542 #endif
1543 }
1544 }
1545 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1546 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1547 rmidi->card, 1, &snd_rawmidi_reg, name) < 0) {
1548 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1549 } else {
1550 rmidi->ossreg++;
1551 }
1552 }
1553 #endif /* CONFIG_SND_OSSEMUL */
1554 up(&register_mutex);
1555 sprintf(name, "midi%d", rmidi->device);
1556 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1557 if (entry) {
1558 entry->private_data = rmidi;
1559 entry->c.text.read_size = 1024;
1560 entry->c.text.read = snd_rawmidi_proc_info_read;
1561 if (snd_info_register(entry) < 0) {
1562 snd_info_free_entry(entry);
1563 entry = NULL;
1564 }
1565 }
1566 rmidi->proc_entry = entry;
1567 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1568 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1569 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1570 rmidi->seq_dev->private_data = rmidi;
1571 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1572 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1573 snd_device_register(rmidi->card, rmidi->seq_dev);
1574 }
1575 }
1576 #endif
1577 return 0;
1578 }
1579
1580 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1581 {
1582 struct snd_rawmidi *rmidi = device->device_data;
1583 int idx;
1584
1585 down(&register_mutex);
1586 idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1587 snd_rawmidi_devices[idx] = NULL;
1588 up(&register_mutex);
1589 return 0;
1590 }
1591
1592 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1593 {
1594 int idx;
1595 struct snd_rawmidi *rmidi = device->device_data;
1596
1597 snd_assert(rmidi != NULL, return -ENXIO);
1598 down(&register_mutex);
1599 idx = (rmidi->card->number * SNDRV_RAWMIDI_DEVICES) + rmidi->device;
1600 snd_rawmidi_devices[idx] = NULL;
1601 if (rmidi->proc_entry) {
1602 snd_info_unregister(rmidi->proc_entry);
1603 rmidi->proc_entry = NULL;
1604 }
1605 #ifdef CONFIG_SND_OSSEMUL
1606 if (rmidi->ossreg) {
1607 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1608 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1609 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1610 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1611 #endif
1612 }
1613 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1614 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1615 rmidi->ossreg = 0;
1616 }
1617 #endif /* CONFIG_SND_OSSEMUL */
1618 if (rmidi->ops && rmidi->ops->dev_unregister)
1619 rmidi->ops->dev_unregister(rmidi);
1620 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1621 up(&register_mutex);
1622 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1623 if (rmidi->seq_dev) {
1624 snd_device_free(rmidi->card, rmidi->seq_dev);
1625 rmidi->seq_dev = NULL;
1626 }
1627 #endif
1628 return snd_rawmidi_free(rmidi);
1629 }
1630
1631 /**
1632 * snd_rawmidi_set_ops - set the rawmidi operators
1633 * @rmidi: the rawmidi instance
1634 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1635 * @ops: the operator table
1636 *
1637 * Sets the rawmidi operators for the given stream direction.
1638 */
1639 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1640 struct snd_rawmidi_ops *ops)
1641 {
1642 struct list_head *list;
1643 struct snd_rawmidi_substream *substream;
1644
1645 list_for_each(list, &rmidi->streams[stream].substreams) {
1646 substream = list_entry(list, struct snd_rawmidi_substream, list);
1647 substream->ops = ops;
1648 }
1649 }
1650
1651 /*
1652 * ENTRY functions
1653 */
1654
1655 static int __init alsa_rawmidi_init(void)
1656 {
1657
1658 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1659 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1660 #ifdef CONFIG_SND_OSSEMUL
1661 { int i;
1662 /* check device map table */
1663 for (i = 0; i < SNDRV_CARDS; i++) {
1664 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1665 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1666 midi_map[i] = 0;
1667 }
1668 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1669 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1670 amidi_map[i] = 1;
1671 }
1672 }
1673 }
1674 #endif /* CONFIG_SND_OSSEMUL */
1675 return 0;
1676 }
1677
1678 static void __exit alsa_rawmidi_exit(void)
1679 {
1680 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1681 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1682 }
1683
1684 module_init(alsa_rawmidi_init)
1685 module_exit(alsa_rawmidi_exit)
1686
1687 EXPORT_SYMBOL(snd_rawmidi_output_params);
1688 EXPORT_SYMBOL(snd_rawmidi_input_params);
1689 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1690 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1691 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1692 EXPORT_SYMBOL(snd_rawmidi_receive);
1693 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1695 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1696 EXPORT_SYMBOL(snd_rawmidi_transmit);
1697 EXPORT_SYMBOL(snd_rawmidi_new);
1698 EXPORT_SYMBOL(snd_rawmidi_set_ops);
1699 EXPORT_SYMBOL(snd_rawmidi_info);
1700 EXPORT_SYMBOL(snd_rawmidi_info_select);
1701 EXPORT_SYMBOL(snd_rawmidi_kernel_open);
1702 EXPORT_SYMBOL(snd_rawmidi_kernel_release);
1703 EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1704 EXPORT_SYMBOL(snd_rawmidi_kernel_write);
Linux kernel - Deliverables
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