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[SCTP]: Prevent possible infinite recursion with multiple bundled DATA.
[linux-2.6/mini2440.git] / sound / core / rawmidi.c
blob87b47c9564f78029ad6ceaaaf0e8b700fdcbb5d5
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 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
635 if (!newbuf)
636 return -ENOMEM;
637 kfree(runtime->buffer);
638 runtime->buffer = newbuf;
639 runtime->buffer_size = params->buffer_size;
640 runtime->avail = runtime->buffer_size;
641 }
642 runtime->avail_min = params->avail_min;
643 substream->active_sensing = !params->no_active_sensing;
644 return 0;
645 }
646
647 int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
648 struct snd_rawmidi_params * params)
649 {
650 char *newbuf;
651 struct snd_rawmidi_runtime *runtime = substream->runtime;
652
653 snd_rawmidi_drain_input(substream);
654 if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L) {
655 return -EINVAL;
656 }
657 if (params->avail_min < 1 || params->avail_min > params->buffer_size) {
658 return -EINVAL;
659 }
660 if (params->buffer_size != runtime->buffer_size) {
661 newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
662 if (!newbuf)
663 return -ENOMEM;
664 kfree(runtime->buffer);
665 runtime->buffer = newbuf;
666 runtime->buffer_size = params->buffer_size;
667 }
668 runtime->avail_min = params->avail_min;
669 return 0;
670 }
671
672 static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
673 struct snd_rawmidi_status * status)
674 {
675 struct snd_rawmidi_runtime *runtime = substream->runtime;
676
677 memset(status, 0, sizeof(*status));
678 status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
679 spin_lock_irq(&runtime->lock);
680 status->avail = runtime->avail;
681 spin_unlock_irq(&runtime->lock);
682 return 0;
683 }
684
685 static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
686 struct snd_rawmidi_status * status)
687 {
688 struct snd_rawmidi_runtime *runtime = substream->runtime;
689
690 memset(status, 0, sizeof(*status));
691 status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
692 spin_lock_irq(&runtime->lock);
693 status->avail = runtime->avail;
694 status->xruns = runtime->xruns;
695 runtime->xruns = 0;
696 spin_unlock_irq(&runtime->lock);
697 return 0;
698 }
699
700 static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
701 {
702 struct snd_rawmidi_file *rfile;
703 void __user *argp = (void __user *)arg;
704
705 rfile = file->private_data;
706 if (((cmd >> 8) & 0xff) != 'W')
707 return -ENOTTY;
708 switch (cmd) {
709 case SNDRV_RAWMIDI_IOCTL_PVERSION:
710 return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
711 case SNDRV_RAWMIDI_IOCTL_INFO:
712 {
713 int stream;
714 struct snd_rawmidi_info __user *info = argp;
715 if (get_user(stream, &info->stream))
716 return -EFAULT;
717 switch (stream) {
718 case SNDRV_RAWMIDI_STREAM_INPUT:
719 return snd_rawmidi_info_user(rfile->input, info);
720 case SNDRV_RAWMIDI_STREAM_OUTPUT:
721 return snd_rawmidi_info_user(rfile->output, info);
722 default:
723 return -EINVAL;
724 }
725 }
726 case SNDRV_RAWMIDI_IOCTL_PARAMS:
727 {
728 struct snd_rawmidi_params params;
729 if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
730 return -EFAULT;
731 switch (params.stream) {
732 case SNDRV_RAWMIDI_STREAM_OUTPUT:
733 if (rfile->output == NULL)
734 return -EINVAL;
735 return snd_rawmidi_output_params(rfile->output, &params);
736 case SNDRV_RAWMIDI_STREAM_INPUT:
737 if (rfile->input == NULL)
738 return -EINVAL;
739 return snd_rawmidi_input_params(rfile->input, &params);
740 default:
741 return -EINVAL;
742 }
743 }
744 case SNDRV_RAWMIDI_IOCTL_STATUS:
745 {
746 int err = 0;
747 struct snd_rawmidi_status status;
748 if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status)))
749 return -EFAULT;
750 switch (status.stream) {
751 case SNDRV_RAWMIDI_STREAM_OUTPUT:
752 if (rfile->output == NULL)
753 return -EINVAL;
754 err = snd_rawmidi_output_status(rfile->output, &status);
755 break;
756 case SNDRV_RAWMIDI_STREAM_INPUT:
757 if (rfile->input == NULL)
758 return -EINVAL;
759 err = snd_rawmidi_input_status(rfile->input, &status);
760 break;
761 default:
762 return -EINVAL;
763 }
764 if (err < 0)
765 return err;
766 if (copy_to_user(argp, &status, sizeof(struct snd_rawmidi_status)))
767 return -EFAULT;
768 return 0;
769 }
770 case SNDRV_RAWMIDI_IOCTL_DROP:
771 {
772 int val;
773 if (get_user(val, (int __user *) argp))
774 return -EFAULT;
775 switch (val) {
776 case SNDRV_RAWMIDI_STREAM_OUTPUT:
777 if (rfile->output == NULL)
778 return -EINVAL;
779 return snd_rawmidi_drop_output(rfile->output);
780 default:
781 return -EINVAL;
782 }
783 }
784 case SNDRV_RAWMIDI_IOCTL_DRAIN:
785 {
786 int val;
787 if (get_user(val, (int __user *) argp))
788 return -EFAULT;
789 switch (val) {
790 case SNDRV_RAWMIDI_STREAM_OUTPUT:
791 if (rfile->output == NULL)
792 return -EINVAL;
793 return snd_rawmidi_drain_output(rfile->output);
794 case SNDRV_RAWMIDI_STREAM_INPUT:
795 if (rfile->input == NULL)
796 return -EINVAL;
797 return snd_rawmidi_drain_input(rfile->input);
798 default:
799 return -EINVAL;
800 }
801 }
802 #ifdef CONFIG_SND_DEBUG
803 default:
804 snd_printk(KERN_WARNING "rawmidi: unknown command = 0x%x\n", cmd);
805 #endif
806 }
807 return -ENOTTY;
808 }
809
810 static int snd_rawmidi_control_ioctl(struct snd_card *card,
811 struct snd_ctl_file *control,
812 unsigned int cmd,
813 unsigned long arg)
814 {
815 void __user *argp = (void __user *)arg;
816
817 switch (cmd) {
818 case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
819 {
820 int device;
821
822 if (get_user(device, (int __user *)argp))
823 return -EFAULT;
824 mutex_lock(&register_mutex);
825 device = device < 0 ? 0 : device + 1;
826 while (device < SNDRV_RAWMIDI_DEVICES) {
827 if (snd_rawmidi_search(card, device))
828 break;
829 device++;
830 }
831 if (device == SNDRV_RAWMIDI_DEVICES)
832 device = -1;
833 mutex_unlock(&register_mutex);
834 if (put_user(device, (int __user *)argp))
835 return -EFAULT;
836 return 0;
837 }
838 case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
839 {
840 int val;
841
842 if (get_user(val, (int __user *)argp))
843 return -EFAULT;
844 control->prefer_rawmidi_subdevice = val;
845 return 0;
846 }
847 case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
848 return snd_rawmidi_info_select_user(card, argp);
849 }
850 return -ENOIOCTLCMD;
851 }
852
853 /**
854 * snd_rawmidi_receive - receive the input data from the device
855 * @substream: the rawmidi substream
856 * @buffer: the buffer pointer
857 * @count: the data size to read
858 *
859 * Reads the data from the internal buffer.
860 *
861 * Returns the size of read data, or a negative error code on failure.
862 */
863 int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
864 const unsigned char *buffer, int count)
865 {
866 unsigned long flags;
867 int result = 0, count1;
868 struct snd_rawmidi_runtime *runtime = substream->runtime;
869
870 if (runtime->buffer == NULL) {
871 snd_printd("snd_rawmidi_receive: input is not active!!!\n");
872 return -EINVAL;
873 }
874 spin_lock_irqsave(&runtime->lock, flags);
875 if (count == 1) { /* special case, faster code */
876 substream->bytes++;
877 if (runtime->avail < runtime->buffer_size) {
878 runtime->buffer[runtime->hw_ptr++] = buffer[0];
879 runtime->hw_ptr %= runtime->buffer_size;
880 runtime->avail++;
881 result++;
882 } else {
883 runtime->xruns++;
884 }
885 } else {
886 substream->bytes += count;
887 count1 = runtime->buffer_size - runtime->hw_ptr;
888 if (count1 > count)
889 count1 = count;
890 if (count1 > (int)(runtime->buffer_size - runtime->avail))
891 count1 = runtime->buffer_size - runtime->avail;
892 memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
893 runtime->hw_ptr += count1;
894 runtime->hw_ptr %= runtime->buffer_size;
895 runtime->avail += count1;
896 count -= count1;
897 result += count1;
898 if (count > 0) {
899 buffer += count1;
900 count1 = count;
901 if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
902 count1 = runtime->buffer_size - runtime->avail;
903 runtime->xruns += count - count1;
904 }
905 if (count1 > 0) {
906 memcpy(runtime->buffer, buffer, count1);
907 runtime->hw_ptr = count1;
908 runtime->avail += count1;
909 result += count1;
910 }
911 }
912 }
913 if (result > 0) {
914 if (runtime->event)
915 tasklet_hi_schedule(&runtime->tasklet);
916 else if (snd_rawmidi_ready(substream))
917 wake_up(&runtime->sleep);
918 }
919 spin_unlock_irqrestore(&runtime->lock, flags);
920 return result;
921 }
922
923 static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
924 unsigned char *buf, long count, int kernel)
925 {
926 unsigned long flags;
927 long result = 0, count1;
928 struct snd_rawmidi_runtime *runtime = substream->runtime;
929
930 while (count > 0 && runtime->avail) {
931 count1 = runtime->buffer_size - runtime->appl_ptr;
932 if (count1 > count)
933 count1 = count;
934 spin_lock_irqsave(&runtime->lock, flags);
935 if (count1 > (int)runtime->avail)
936 count1 = runtime->avail;
937 if (kernel) {
938 memcpy(buf + result, runtime->buffer + runtime->appl_ptr, count1);
939 } else {
940 spin_unlock_irqrestore(&runtime->lock, flags);
941 if (copy_to_user((char __user *)buf + result,
942 runtime->buffer + runtime->appl_ptr, count1)) {
943 return result > 0 ? result : -EFAULT;
944 }
945 spin_lock_irqsave(&runtime->lock, flags);
946 }
947 runtime->appl_ptr += count1;
948 runtime->appl_ptr %= runtime->buffer_size;
949 runtime->avail -= count1;
950 spin_unlock_irqrestore(&runtime->lock, flags);
951 result += count1;
952 count -= count1;
953 }
954 return result;
955 }
956
957 long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
958 unsigned char *buf, long count)
959 {
960 snd_rawmidi_input_trigger(substream, 1);
961 return snd_rawmidi_kernel_read1(substream, buf, count, 1);
962 }
963
964 static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
965 loff_t *offset)
966 {
967 long result;
968 int count1;
969 struct snd_rawmidi_file *rfile;
970 struct snd_rawmidi_substream *substream;
971 struct snd_rawmidi_runtime *runtime;
972
973 rfile = file->private_data;
974 substream = rfile->input;
975 if (substream == NULL)
976 return -EIO;
977 runtime = substream->runtime;
978 snd_rawmidi_input_trigger(substream, 1);
979 result = 0;
980 while (count > 0) {
981 spin_lock_irq(&runtime->lock);
982 while (!snd_rawmidi_ready(substream)) {
983 wait_queue_t wait;
984 if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
985 spin_unlock_irq(&runtime->lock);
986 return result > 0 ? result : -EAGAIN;
987 }
988 init_waitqueue_entry(&wait, current);
989 add_wait_queue(&runtime->sleep, &wait);
990 set_current_state(TASK_INTERRUPTIBLE);
991 spin_unlock_irq(&runtime->lock);
992 schedule();
993 remove_wait_queue(&runtime->sleep, &wait);
994 if (signal_pending(current))
995 return result > 0 ? result : -ERESTARTSYS;
996 if (!runtime->avail)
997 return result > 0 ? result : -EIO;
998 spin_lock_irq(&runtime->lock);
999 }
1000 spin_unlock_irq(&runtime->lock);
1001 count1 = snd_rawmidi_kernel_read1(substream,
1002 (unsigned char __force *)buf,
1003 count, 0);
1004 if (count1 < 0)
1005 return result > 0 ? result : count1;
1006 result += count1;
1007 buf += count1;
1008 count -= count1;
1009 }
1010 return result;
1011 }
1012
1013 /**
1014 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1015 * @substream: the rawmidi substream
1016 *
1017 * Returns 1 if the internal output buffer is empty, 0 if not.
1018 */
1019 int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1020 {
1021 struct snd_rawmidi_runtime *runtime = substream->runtime;
1022 int result;
1023 unsigned long flags;
1024
1025 if (runtime->buffer == NULL) {
1026 snd_printd("snd_rawmidi_transmit_empty: output is not active!!!\n");
1027 return 1;
1028 }
1029 spin_lock_irqsave(&runtime->lock, flags);
1030 result = runtime->avail >= runtime->buffer_size;
1031 spin_unlock_irqrestore(&runtime->lock, flags);
1032 return result;
1033 }
1034
1035 /**
1036 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1037 * @substream: the rawmidi substream
1038 * @buffer: the buffer pointer
1039 * @count: data size to transfer
1040 *
1041 * Copies data from the internal output buffer to the given buffer.
1042 *
1043 * Call this in the interrupt handler when the midi output is ready,
1044 * and call snd_rawmidi_transmit_ack() after the transmission is
1045 * finished.
1046 *
1047 * Returns the size of copied data, or a negative error code on failure.
1048 */
1049 int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1050 unsigned char *buffer, int count)
1051 {
1052 unsigned long flags;
1053 int result, count1;
1054 struct snd_rawmidi_runtime *runtime = substream->runtime;
1055
1056 if (runtime->buffer == NULL) {
1057 snd_printd("snd_rawmidi_transmit_peek: output is not active!!!\n");
1058 return -EINVAL;
1059 }
1060 result = 0;
1061 spin_lock_irqsave(&runtime->lock, flags);
1062 if (runtime->avail >= runtime->buffer_size) {
1063 /* warning: lowlevel layer MUST trigger down the hardware */
1064 goto __skip;
1065 }
1066 if (count == 1) { /* special case, faster code */
1067 *buffer = runtime->buffer[runtime->hw_ptr];
1068 result++;
1069 } else {
1070 count1 = runtime->buffer_size - runtime->hw_ptr;
1071 if (count1 > count)
1072 count1 = count;
1073 if (count1 > (int)(runtime->buffer_size - runtime->avail))
1074 count1 = runtime->buffer_size - runtime->avail;
1075 memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1076 count -= count1;
1077 result += count1;
1078 if (count > 0) {
1079 if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1080 count = runtime->buffer_size - runtime->avail - count1;
1081 memcpy(buffer + count1, runtime->buffer, count);
1082 result += count;
1083 }
1084 }
1085 __skip:
1086 spin_unlock_irqrestore(&runtime->lock, flags);
1087 return result;
1088 }
1089
1090 /**
1091 * snd_rawmidi_transmit_ack - acknowledge the transmission
1092 * @substream: the rawmidi substream
1093 * @count: the tranferred count
1094 *
1095 * Advances the hardware pointer for the internal output buffer with
1096 * the given size and updates the condition.
1097 * Call after the transmission is finished.
1098 *
1099 * Returns the advanced size if successful, or a negative error code on failure.
1100 */
1101 int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1102 {
1103 unsigned long flags;
1104 struct snd_rawmidi_runtime *runtime = substream->runtime;
1105
1106 if (runtime->buffer == NULL) {
1107 snd_printd("snd_rawmidi_transmit_ack: output is not active!!!\n");
1108 return -EINVAL;
1109 }
1110 spin_lock_irqsave(&runtime->lock, flags);
1111 snd_assert(runtime->avail + count <= runtime->buffer_size, );
1112 runtime->hw_ptr += count;
1113 runtime->hw_ptr %= runtime->buffer_size;
1114 runtime->avail += count;
1115 substream->bytes += count;
1116 if (count > 0) {
1117 if (runtime->drain || snd_rawmidi_ready(substream))
1118 wake_up(&runtime->sleep);
1119 }
1120 spin_unlock_irqrestore(&runtime->lock, flags);
1121 return count;
1122 }
1123
1124 /**
1125 * snd_rawmidi_transmit - copy from the buffer to the device
1126 * @substream: the rawmidi substream
1127 * @buffer: the buffer pointer
1128 * @count: the data size to transfer
1129 *
1130 * Copies data from the buffer to the device and advances the pointer.
1131 *
1132 * Returns the copied size if successful, or a negative error code on failure.
1133 */
1134 int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1135 unsigned char *buffer, int count)
1136 {
1137 count = snd_rawmidi_transmit_peek(substream, buffer, count);
1138 if (count < 0)
1139 return count;
1140 return snd_rawmidi_transmit_ack(substream, count);
1141 }
1142
1143 static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1144 const unsigned char *buf, long count, int kernel)
1145 {
1146 unsigned long flags;
1147 long count1, result;
1148 struct snd_rawmidi_runtime *runtime = substream->runtime;
1149
1150 snd_assert(buf != NULL, return -EINVAL);
1151 snd_assert(runtime->buffer != NULL, return -EINVAL);
1152
1153 result = 0;
1154 spin_lock_irqsave(&runtime->lock, flags);
1155 if (substream->append) {
1156 if ((long)runtime->avail < count) {
1157 spin_unlock_irqrestore(&runtime->lock, flags);
1158 return -EAGAIN;
1159 }
1160 }
1161 while (count > 0 && runtime->avail > 0) {
1162 count1 = runtime->buffer_size - runtime->appl_ptr;
1163 if (count1 > count)
1164 count1 = count;
1165 if (count1 > (long)runtime->avail)
1166 count1 = runtime->avail;
1167 if (kernel) {
1168 memcpy(runtime->buffer + runtime->appl_ptr, buf, count1);
1169 } else {
1170 spin_unlock_irqrestore(&runtime->lock, flags);
1171 if (copy_from_user(runtime->buffer + runtime->appl_ptr,
1172 (char __user *)buf, count1)) {
1173 spin_lock_irqsave(&runtime->lock, flags);
1174 result = result > 0 ? result : -EFAULT;
1175 goto __end;
1176 }
1177 spin_lock_irqsave(&runtime->lock, flags);
1178 }
1179 runtime->appl_ptr += count1;
1180 runtime->appl_ptr %= runtime->buffer_size;
1181 runtime->avail -= count1;
1182 result += count1;
1183 buf += count1;
1184 count -= count1;
1185 }
1186 __end:
1187 count1 = runtime->avail < runtime->buffer_size;
1188 spin_unlock_irqrestore(&runtime->lock, flags);
1189 if (count1)
1190 snd_rawmidi_output_trigger(substream, 1);
1191 return result;
1192 }
1193
1194 long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1195 const unsigned char *buf, long count)
1196 {
1197 return snd_rawmidi_kernel_write1(substream, buf, count, 1);
1198 }
1199
1200 static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1201 size_t count, loff_t *offset)
1202 {
1203 long result, timeout;
1204 int count1;
1205 struct snd_rawmidi_file *rfile;
1206 struct snd_rawmidi_runtime *runtime;
1207 struct snd_rawmidi_substream *substream;
1208
1209 rfile = file->private_data;
1210 substream = rfile->output;
1211 runtime = substream->runtime;
1212 /* we cannot put an atomic message to our buffer */
1213 if (substream->append && count > runtime->buffer_size)
1214 return -EIO;
1215 result = 0;
1216 while (count > 0) {
1217 spin_lock_irq(&runtime->lock);
1218 while (!snd_rawmidi_ready_append(substream, count)) {
1219 wait_queue_t wait;
1220 if (file->f_flags & O_NONBLOCK) {
1221 spin_unlock_irq(&runtime->lock);
1222 return result > 0 ? result : -EAGAIN;
1223 }
1224 init_waitqueue_entry(&wait, current);
1225 add_wait_queue(&runtime->sleep, &wait);
1226 set_current_state(TASK_INTERRUPTIBLE);
1227 spin_unlock_irq(&runtime->lock);
1228 timeout = schedule_timeout(30 * HZ);
1229 remove_wait_queue(&runtime->sleep, &wait);
1230 if (signal_pending(current))
1231 return result > 0 ? result : -ERESTARTSYS;
1232 if (!runtime->avail && !timeout)
1233 return result > 0 ? result : -EIO;
1234 spin_lock_irq(&runtime->lock);
1235 }
1236 spin_unlock_irq(&runtime->lock);
1237 count1 = snd_rawmidi_kernel_write1(substream,
1238 (unsigned char __force *)buf,
1239 count, 0);
1240 if (count1 < 0)
1241 return result > 0 ? result : count1;
1242 result += count1;
1243 buf += count1;
1244 if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1245 break;
1246 count -= count1;
1247 }
1248 if (file->f_flags & O_SYNC) {
1249 spin_lock_irq(&runtime->lock);
1250 while (runtime->avail != runtime->buffer_size) {
1251 wait_queue_t wait;
1252 unsigned int last_avail = runtime->avail;
1253 init_waitqueue_entry(&wait, current);
1254 add_wait_queue(&runtime->sleep, &wait);
1255 set_current_state(TASK_INTERRUPTIBLE);
1256 spin_unlock_irq(&runtime->lock);
1257 timeout = schedule_timeout(30 * HZ);
1258 remove_wait_queue(&runtime->sleep, &wait);
1259 if (signal_pending(current))
1260 return result > 0 ? result : -ERESTARTSYS;
1261 if (runtime->avail == last_avail && !timeout)
1262 return result > 0 ? result : -EIO;
1263 spin_lock_irq(&runtime->lock);
1264 }
1265 spin_unlock_irq(&runtime->lock);
1266 }
1267 return result;
1268 }
1269
1270 static unsigned int snd_rawmidi_poll(struct file *file, poll_table * wait)
1271 {
1272 struct snd_rawmidi_file *rfile;
1273 struct snd_rawmidi_runtime *runtime;
1274 unsigned int mask;
1275
1276 rfile = file->private_data;
1277 if (rfile->input != NULL) {
1278 runtime = rfile->input->runtime;
1279 snd_rawmidi_input_trigger(rfile->input, 1);
1280 poll_wait(file, &runtime->sleep, wait);
1281 }
1282 if (rfile->output != NULL) {
1283 runtime = rfile->output->runtime;
1284 poll_wait(file, &runtime->sleep, wait);
1285 }
1286 mask = 0;
1287 if (rfile->input != NULL) {
1288 if (snd_rawmidi_ready(rfile->input))
1289 mask |= POLLIN | POLLRDNORM;
1290 }
1291 if (rfile->output != NULL) {
1292 if (snd_rawmidi_ready(rfile->output))
1293 mask |= POLLOUT | POLLWRNORM;
1294 }
1295 return mask;
1296 }
1297
1298 /*
1299 */
1300 #ifdef CONFIG_COMPAT
1301 #include "rawmidi_compat.c"
1302 #else
1303 #define snd_rawmidi_ioctl_compat NULL
1304 #endif
1305
1306 /*
1307
1308 */
1309
1310 static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1311 struct snd_info_buffer *buffer)
1312 {
1313 struct snd_rawmidi *rmidi;
1314 struct snd_rawmidi_substream *substream;
1315 struct snd_rawmidi_runtime *runtime;
1316 struct list_head *list;
1317
1318 rmidi = entry->private_data;
1319 snd_iprintf(buffer, "%s\n\n", rmidi->name);
1320 mutex_lock(&rmidi->open_mutex);
1321 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1322 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
1323 substream = list_entry(list, struct snd_rawmidi_substream, list);
1324 snd_iprintf(buffer,
1325 "Output %d\n"
1326 " Tx bytes : %lu\n",
1327 substream->number,
1328 (unsigned long) substream->bytes);
1329 if (substream->opened) {
1330 runtime = substream->runtime;
1331 snd_iprintf(buffer,
1332 " Mode : %s\n"
1333 " Buffer size : %lu\n"
1334 " Avail : %lu\n",
1335 runtime->oss ? "OSS compatible" : "native",
1336 (unsigned long) runtime->buffer_size,
1337 (unsigned long) runtime->avail);
1338 }
1339 }
1340 }
1341 if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1342 list_for_each(list, &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
1343 substream = list_entry(list, struct snd_rawmidi_substream, list);
1344 snd_iprintf(buffer,
1345 "Input %d\n"
1346 " Rx bytes : %lu\n",
1347 substream->number,
1348 (unsigned long) substream->bytes);
1349 if (substream->opened) {
1350 runtime = substream->runtime;
1351 snd_iprintf(buffer,
1352 " Buffer size : %lu\n"
1353 " Avail : %lu\n"
1354 " Overruns : %lu\n",
1355 (unsigned long) runtime->buffer_size,
1356 (unsigned long) runtime->avail,
1357 (unsigned long) runtime->xruns);
1358 }
1359 }
1360 }
1361 mutex_unlock(&rmidi->open_mutex);
1362 }
1363
1364 /*
1365 * Register functions
1366 */
1367
1368 static struct file_operations snd_rawmidi_f_ops =
1369 {
1370 .owner = THIS_MODULE,
1371 .read = snd_rawmidi_read,
1372 .write = snd_rawmidi_write,
1373 .open = snd_rawmidi_open,
1374 .release = snd_rawmidi_release,
1375 .poll = snd_rawmidi_poll,
1376 .unlocked_ioctl = snd_rawmidi_ioctl,
1377 .compat_ioctl = snd_rawmidi_ioctl_compat,
1378 };
1379
1380 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1381 struct snd_rawmidi_str *stream,
1382 int direction,
1383 int count)
1384 {
1385 struct snd_rawmidi_substream *substream;
1386 int idx;
1387
1388 INIT_LIST_HEAD(&stream->substreams);
1389 for (idx = 0; idx < count; idx++) {
1390 substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1391 if (substream == NULL) {
1392 snd_printk(KERN_ERR "rawmidi: cannot allocate substream\n");
1393 return -ENOMEM;
1394 }
1395 substream->stream = direction;
1396 substream->number = idx;
1397 substream->rmidi = rmidi;
1398 substream->pstr = stream;
1399 list_add_tail(&substream->list, &stream->substreams);
1400 stream->substream_count++;
1401 }
1402 return 0;
1403 }
1404
1405 /**
1406 * snd_rawmidi_new - create a rawmidi instance
1407 * @card: the card instance
1408 * @id: the id string
1409 * @device: the device index
1410 * @output_count: the number of output streams
1411 * @input_count: the number of input streams
1412 * @rrawmidi: the pointer to store the new rawmidi instance
1413 *
1414 * Creates a new rawmidi instance.
1415 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1416 *
1417 * Returns zero if successful, or a negative error code on failure.
1418 */
1419 int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1420 int output_count, int input_count,
1421 struct snd_rawmidi ** rrawmidi)
1422 {
1423 struct snd_rawmidi *rmidi;
1424 int err;
1425 static struct snd_device_ops ops = {
1426 .dev_free = snd_rawmidi_dev_free,
1427 .dev_register = snd_rawmidi_dev_register,
1428 .dev_disconnect = snd_rawmidi_dev_disconnect,
1429 .dev_unregister = snd_rawmidi_dev_unregister
1430 };
1431
1432 snd_assert(rrawmidi != NULL, return -EINVAL);
1433 *rrawmidi = NULL;
1434 snd_assert(card != NULL, return -ENXIO);
1435 rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1436 if (rmidi == NULL) {
1437 snd_printk(KERN_ERR "rawmidi: cannot allocate\n");
1438 return -ENOMEM;
1439 }
1440 rmidi->card = card;
1441 rmidi->device = device;
1442 mutex_init(&rmidi->open_mutex);
1443 init_waitqueue_head(&rmidi->open_wait);
1444 if (id != NULL)
1445 strlcpy(rmidi->id, id, sizeof(rmidi->id));
1446 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1447 &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1448 SNDRV_RAWMIDI_STREAM_INPUT,
1449 input_count)) < 0) {
1450 snd_rawmidi_free(rmidi);
1451 return err;
1452 }
1453 if ((err = snd_rawmidi_alloc_substreams(rmidi,
1454 &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1455 SNDRV_RAWMIDI_STREAM_OUTPUT,
1456 output_count)) < 0) {
1457 snd_rawmidi_free(rmidi);
1458 return err;
1459 }
1460 if ((err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops)) < 0) {
1461 snd_rawmidi_free(rmidi);
1462 return err;
1463 }
1464 *rrawmidi = rmidi;
1465 return 0;
1466 }
1467
1468 static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1469 {
1470 struct snd_rawmidi_substream *substream;
1471
1472 while (!list_empty(&stream->substreams)) {
1473 substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1474 list_del(&substream->list);
1475 kfree(substream);
1476 }
1477 }
1478
1479 static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1480 {
1481 snd_assert(rmidi != NULL, return -ENXIO);
1482 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1483 snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1484 if (rmidi->private_free)
1485 rmidi->private_free(rmidi);
1486 kfree(rmidi);
1487 return 0;
1488 }
1489
1490 static int snd_rawmidi_dev_free(struct snd_device *device)
1491 {
1492 struct snd_rawmidi *rmidi = device->device_data;
1493 return snd_rawmidi_free(rmidi);
1494 }
1495
1496 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1497 static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1498 {
1499 struct snd_rawmidi *rmidi = device->private_data;
1500 rmidi->seq_dev = NULL;
1501 }
1502 #endif
1503
1504 static int snd_rawmidi_dev_register(struct snd_device *device)
1505 {
1506 int err;
1507 struct snd_info_entry *entry;
1508 char name[16];
1509 struct snd_rawmidi *rmidi = device->device_data;
1510
1511 if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1512 return -ENOMEM;
1513 mutex_lock(&register_mutex);
1514 if (snd_rawmidi_search(rmidi->card, rmidi->device)) {
1515 mutex_unlock(&register_mutex);
1516 return -EBUSY;
1517 }
1518 list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1519 sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
1520 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1521 rmidi->card, rmidi->device,
1522 &snd_rawmidi_f_ops, rmidi, name)) < 0) {
1523 snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
1524 list_del(&rmidi->list);
1525 mutex_unlock(&register_mutex);
1526 return err;
1527 }
1528 if (rmidi->ops && rmidi->ops->dev_register &&
1529 (err = rmidi->ops->dev_register(rmidi)) < 0) {
1530 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1531 list_del(&rmidi->list);
1532 mutex_unlock(&register_mutex);
1533 return err;
1534 }
1535 #ifdef CONFIG_SND_OSSEMUL
1536 rmidi->ossreg = 0;
1537 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1538 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1539 rmidi->card, 0, &snd_rawmidi_f_ops,
1540 rmidi, name) < 0) {
1541 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
1542 } else {
1543 rmidi->ossreg++;
1544 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1545 snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1546 #endif
1547 }
1548 }
1549 if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1550 if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1551 rmidi->card, 1, &snd_rawmidi_f_ops,
1552 rmidi, name) < 0) {
1553 snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
1554 } else {
1555 rmidi->ossreg++;
1556 }
1557 }
1558 #endif /* CONFIG_SND_OSSEMUL */
1559 mutex_unlock(&register_mutex);
1560 sprintf(name, "midi%d", rmidi->device);
1561 entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1562 if (entry) {
1563 entry->private_data = rmidi;
1564 entry->c.text.read_size = 1024;
1565 entry->c.text.read = snd_rawmidi_proc_info_read;
1566 if (snd_info_register(entry) < 0) {
1567 snd_info_free_entry(entry);
1568 entry = NULL;
1569 }
1570 }
1571 rmidi->proc_entry = entry;
1572 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1573 if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1574 if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1575 rmidi->seq_dev->private_data = rmidi;
1576 rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1577 sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1578 snd_device_register(rmidi->card, rmidi->seq_dev);
1579 }
1580 }
1581 #endif
1582 return 0;
1583 }
1584
1585 static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1586 {
1587 struct snd_rawmidi *rmidi = device->device_data;
1588
1589 mutex_lock(&register_mutex);
1590 list_del_init(&rmidi->list);
1591 mutex_unlock(&register_mutex);
1592 return 0;
1593 }
1594
1595 static int snd_rawmidi_dev_unregister(struct snd_device *device)
1596 {
1597 struct snd_rawmidi *rmidi = device->device_data;
1598
1599 snd_assert(rmidi != NULL, return -ENXIO);
1600 mutex_lock(&register_mutex);
1601 list_del(&rmidi->list);
1602 if (rmidi->proc_entry) {
1603 snd_info_unregister(rmidi->proc_entry);
1604 rmidi->proc_entry = NULL;
1605 }
1606 #ifdef CONFIG_SND_OSSEMUL
1607 if (rmidi->ossreg) {
1608 if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1609 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1610 #ifdef SNDRV_OSS_INFO_DEV_MIDI
1611 snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1612 #endif
1613 }
1614 if ((int)rmidi->device == amidi_map[rmidi->card->number])
1615 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1616 rmidi->ossreg = 0;
1617 }
1618 #endif /* CONFIG_SND_OSSEMUL */
1619 if (rmidi->ops && rmidi->ops->dev_unregister)
1620 rmidi->ops->dev_unregister(rmidi);
1621 snd_unregister_device(SNDRV_DEVICE_TYPE_RAWMIDI, rmidi->card, rmidi->device);
1622 mutex_unlock(&register_mutex);
1623 #if defined(CONFIG_SND_SEQUENCER) || (defined(MODULE) && defined(CONFIG_SND_SEQUENCER_MODULE))
1624 if (rmidi->seq_dev) {
1625 snd_device_free(rmidi->card, rmidi->seq_dev);
1626 rmidi->seq_dev = NULL;
1627 }
1628 #endif
1629 return snd_rawmidi_free(rmidi);
1630 }
1631
1632 /**
1633 * snd_rawmidi_set_ops - set the rawmidi operators
1634 * @rmidi: the rawmidi instance
1635 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1636 * @ops: the operator table
1637 *
1638 * Sets the rawmidi operators for the given stream direction.
1639 */
1640 void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1641 struct snd_rawmidi_ops *ops)
1642 {
1643 struct list_head *list;
1644 struct snd_rawmidi_substream *substream;
1645
1646 list_for_each(list, &rmidi->streams[stream].substreams) {
1647 substream = list_entry(list, struct snd_rawmidi_substream, list);
1648 substream->ops = ops;
1649 }
1650 }
1651
1652 /*
1653 * ENTRY functions
1654 */
1655
1656 static int __init alsa_rawmidi_init(void)
1657 {
1658
1659 snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1660 snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1661 #ifdef CONFIG_SND_OSSEMUL
1662 { int i;
1663 /* check device map table */
1664 for (i = 0; i < SNDRV_CARDS; i++) {
1665 if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1666 snd_printk(KERN_ERR "invalid midi_map[%d] = %d\n", i, midi_map[i]);
1667 midi_map[i] = 0;
1668 }
1669 if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1670 snd_printk(KERN_ERR "invalid amidi_map[%d] = %d\n", i, amidi_map[i]);
1671 amidi_map[i] = 1;
1672 }
1673 }
1674 }
1675 #endif /* CONFIG_SND_OSSEMUL */
1676 return 0;
1677 }
1678
1679 static void __exit alsa_rawmidi_exit(void)
1680 {
1681 snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1682 snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1683 }
1684
1685 module_init(alsa_rawmidi_init)
1686 module_exit(alsa_rawmidi_exit)
1687
1688 EXPORT_SYMBOL(snd_rawmidi_output_params);
1689 EXPORT_SYMBOL(snd_rawmidi_input_params);
1690 EXPORT_SYMBOL(snd_rawmidi_drop_output);
1691 EXPORT_SYMBOL(snd_rawmidi_drain_output);
1692 EXPORT_SYMBOL(snd_rawmidi_drain_input);
1693 EXPORT_SYMBOL(snd_rawmidi_receive);
1694 EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1695 EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1696 EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1697 EXPORT_SYMBOL(snd_rawmidi_transmit);
1698 EXPORT_SYMBOL(snd_rawmidi_new);
1699 EXPORT_SYMBOL(snd_rawmidi_set_ops);
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);
Support for the Chinese Samsung S3C2440 based development boards