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1da177e4 LT |
1 | /* |
2 | ********************************************************************** | |
3 | * midi.c - /dev/midi interface for emu10k1 driver | |
4 | * Copyright 1999, 2000 Creative Labs, Inc. | |
5 | * | |
6 | ********************************************************************** | |
7 | * | |
8 | * Date Author Summary of changes | |
9 | * ---- ------ ------------------ | |
10 | * October 20, 1999 Bertrand Lee base code release | |
11 | * | |
12 | ********************************************************************** | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of | |
17 | * the License, or (at your option) any later version. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU General Public | |
25 | * License along with this program; if not, write to the Free | |
26 | * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, | |
27 | * USA. | |
28 | * | |
29 | ********************************************************************** | |
30 | */ | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/poll.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/smp_lock.h> | |
37 | #include <asm/uaccess.h> | |
38 | ||
39 | #include "hwaccess.h" | |
40 | #include "cardmo.h" | |
41 | #include "cardmi.h" | |
42 | #include "midi.h" | |
43 | ||
44 | #ifdef EMU10K1_SEQUENCER | |
45 | #include "../sound_config.h" | |
46 | #endif | |
47 | ||
42225a35 | 48 | static DEFINE_SPINLOCK(midi_spinlock); |
1da177e4 LT |
49 | |
50 | static void init_midi_hdr(struct midi_hdr *midihdr) | |
51 | { | |
52 | midihdr->bufferlength = MIDIIN_BUFLEN; | |
53 | midihdr->bytesrecorded = 0; | |
54 | midihdr->flags = 0; | |
55 | } | |
56 | ||
57 | static int midiin_add_buffer(struct emu10k1_mididevice *midi_dev, struct midi_hdr **midihdrptr) | |
58 | { | |
59 | struct midi_hdr *midihdr; | |
60 | ||
61 | if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr), GFP_KERNEL)) == NULL) { | |
62 | ERROR(); | |
63 | return -EINVAL; | |
64 | } | |
65 | ||
66 | init_midi_hdr(midihdr); | |
67 | ||
4fa95ef6 JJ |
68 | midihdr->data = kmalloc(MIDIIN_BUFLEN, GFP_KERNEL); |
69 | if (!midihdr->data) { | |
1da177e4 LT |
70 | ERROR(); |
71 | kfree(midihdr); | |
72 | return -1; | |
73 | } | |
74 | ||
75 | if (emu10k1_mpuin_add_buffer(midi_dev->card->mpuin, midihdr) < 0) { | |
76 | ERROR(); | |
77 | kfree(midihdr->data); | |
78 | kfree(midihdr); | |
79 | return -1; | |
80 | } | |
81 | ||
82 | *midihdrptr = midihdr; | |
83 | list_add_tail(&midihdr->list, &midi_dev->mid_hdrs); | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static int emu10k1_midi_open(struct inode *inode, struct file *file) | |
89 | { | |
90 | int minor = iminor(inode); | |
91 | struct emu10k1_card *card = NULL; | |
92 | struct emu10k1_mididevice *midi_dev; | |
93 | struct list_head *entry; | |
94 | ||
95 | DPF(2, "emu10k1_midi_open()\n"); | |
96 | ||
97 | /* Check for correct device to open */ | |
98 | list_for_each(entry, &emu10k1_devs) { | |
99 | card = list_entry(entry, struct emu10k1_card, list); | |
100 | ||
101 | if (card->midi_dev == minor) | |
102 | goto match; | |
103 | } | |
104 | ||
105 | return -ENODEV; | |
106 | ||
107 | match: | |
108 | #ifdef EMU10K1_SEQUENCER | |
109 | if (card->seq_mididev) /* card is opened by sequencer */ | |
110 | return -EBUSY; | |
111 | #endif | |
112 | ||
113 | /* Wait for device to become free */ | |
f82945df | 114 | mutex_lock(&card->open_sem); |
1da177e4 LT |
115 | while (card->open_mode & (file->f_mode << FMODE_MIDI_SHIFT)) { |
116 | if (file->f_flags & O_NONBLOCK) { | |
f82945df | 117 | mutex_unlock(&card->open_sem); |
1da177e4 LT |
118 | return -EBUSY; |
119 | } | |
120 | ||
f82945df | 121 | mutex_unlock(&card->open_sem); |
1da177e4 LT |
122 | interruptible_sleep_on(&card->open_wait); |
123 | ||
124 | if (signal_pending(current)) { | |
125 | return -ERESTARTSYS; | |
126 | } | |
127 | ||
f82945df | 128 | mutex_lock(&card->open_sem); |
1da177e4 LT |
129 | } |
130 | ||
131 | if ((midi_dev = (struct emu10k1_mididevice *) kmalloc(sizeof(*midi_dev), GFP_KERNEL)) == NULL) | |
132 | return -EINVAL; | |
133 | ||
134 | midi_dev->card = card; | |
135 | midi_dev->mistate = MIDIIN_STATE_STOPPED; | |
136 | init_waitqueue_head(&midi_dev->oWait); | |
137 | init_waitqueue_head(&midi_dev->iWait); | |
138 | midi_dev->ird = 0; | |
139 | midi_dev->iwr = 0; | |
140 | midi_dev->icnt = 0; | |
141 | INIT_LIST_HEAD(&midi_dev->mid_hdrs); | |
142 | ||
143 | if (file->f_mode & FMODE_READ) { | |
144 | struct midi_openinfo dsCardMidiOpenInfo; | |
145 | struct midi_hdr *midihdr1; | |
146 | struct midi_hdr *midihdr2; | |
147 | ||
148 | dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev; | |
149 | ||
150 | if (emu10k1_mpuin_open(card, &dsCardMidiOpenInfo) < 0) { | |
151 | ERROR(); | |
152 | kfree(midi_dev); | |
153 | return -ENODEV; | |
154 | } | |
155 | ||
156 | /* Add two buffers to receive sysex buffer */ | |
157 | if (midiin_add_buffer(midi_dev, &midihdr1) < 0) { | |
158 | kfree(midi_dev); | |
159 | return -ENODEV; | |
160 | } | |
161 | ||
162 | if (midiin_add_buffer(midi_dev, &midihdr2) < 0) { | |
163 | list_del(&midihdr1->list); | |
164 | kfree(midihdr1->data); | |
165 | kfree(midihdr1); | |
166 | kfree(midi_dev); | |
167 | return -ENODEV; | |
168 | } | |
169 | } | |
170 | ||
171 | if (file->f_mode & FMODE_WRITE) { | |
172 | struct midi_openinfo dsCardMidiOpenInfo; | |
173 | ||
174 | dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev; | |
175 | ||
176 | if (emu10k1_mpuout_open(card, &dsCardMidiOpenInfo) < 0) { | |
177 | ERROR(); | |
178 | kfree(midi_dev); | |
179 | return -ENODEV; | |
180 | } | |
181 | } | |
182 | ||
183 | file->private_data = (void *) midi_dev; | |
184 | ||
185 | card->open_mode |= (file->f_mode << FMODE_MIDI_SHIFT) & (FMODE_MIDI_READ | FMODE_MIDI_WRITE); | |
186 | ||
f82945df | 187 | mutex_unlock(&card->open_sem); |
1da177e4 LT |
188 | |
189 | return nonseekable_open(inode, file); | |
190 | } | |
191 | ||
192 | static int emu10k1_midi_release(struct inode *inode, struct file *file) | |
193 | { | |
194 | struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data; | |
195 | struct emu10k1_card *card; | |
196 | ||
197 | lock_kernel(); | |
198 | ||
199 | card = midi_dev->card; | |
200 | DPF(2, "emu10k1_midi_release()\n"); | |
201 | ||
202 | if (file->f_mode & FMODE_WRITE) { | |
203 | if (!(file->f_flags & O_NONBLOCK)) { | |
204 | ||
205 | while (!signal_pending(current) && (card->mpuout->firstmidiq != NULL)) { | |
206 | DPF(4, "Cannot close - buffers not empty\n"); | |
207 | ||
208 | interruptible_sleep_on(&midi_dev->oWait); | |
209 | ||
210 | } | |
211 | } | |
212 | ||
213 | emu10k1_mpuout_close(card); | |
214 | } | |
215 | ||
216 | if (file->f_mode & FMODE_READ) { | |
217 | struct midi_hdr *midihdr; | |
218 | ||
219 | if (midi_dev->mistate == MIDIIN_STATE_STARTED) { | |
220 | emu10k1_mpuin_stop(card); | |
221 | midi_dev->mistate = MIDIIN_STATE_STOPPED; | |
222 | } | |
223 | ||
224 | emu10k1_mpuin_reset(card); | |
225 | emu10k1_mpuin_close(card); | |
226 | ||
227 | while (!list_empty(&midi_dev->mid_hdrs)) { | |
228 | midihdr = list_entry(midi_dev->mid_hdrs.next, struct midi_hdr, list); | |
229 | ||
230 | list_del(midi_dev->mid_hdrs.next); | |
231 | kfree(midihdr->data); | |
232 | kfree(midihdr); | |
233 | } | |
234 | } | |
235 | ||
236 | kfree(midi_dev); | |
237 | ||
f82945df | 238 | mutex_lock(&card->open_sem); |
1da177e4 | 239 | card->open_mode &= ~((file->f_mode << FMODE_MIDI_SHIFT) & (FMODE_MIDI_READ | FMODE_MIDI_WRITE)); |
f82945df | 240 | mutex_unlock(&card->open_sem); |
1da177e4 LT |
241 | wake_up_interruptible(&card->open_wait); |
242 | ||
243 | unlock_kernel(); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static ssize_t emu10k1_midi_read(struct file *file, char __user *buffer, size_t count, loff_t * pos) | |
249 | { | |
250 | struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data; | |
251 | ssize_t ret = 0; | |
252 | u16 cnt; | |
253 | unsigned long flags; | |
254 | ||
255 | DPD(4, "emu10k1_midi_read(), count %#x\n", (u32) count); | |
256 | ||
257 | if (!access_ok(VERIFY_WRITE, buffer, count)) | |
258 | return -EFAULT; | |
259 | ||
260 | if (midi_dev->mistate == MIDIIN_STATE_STOPPED) { | |
261 | if (emu10k1_mpuin_start(midi_dev->card) < 0) { | |
262 | ERROR(); | |
263 | return -EINVAL; | |
264 | } | |
265 | ||
266 | midi_dev->mistate = MIDIIN_STATE_STARTED; | |
267 | } | |
268 | ||
269 | while (count > 0) { | |
270 | cnt = MIDIIN_BUFLEN - midi_dev->ird; | |
271 | ||
272 | spin_lock_irqsave(&midi_spinlock, flags); | |
273 | ||
274 | if (midi_dev->icnt < cnt) | |
275 | cnt = midi_dev->icnt; | |
276 | ||
277 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
278 | ||
279 | if (cnt > count) | |
280 | cnt = count; | |
281 | ||
282 | if (cnt <= 0) { | |
283 | if (file->f_flags & O_NONBLOCK) | |
284 | return ret ? ret : -EAGAIN; | |
285 | DPF(2, " Go to sleep...\n"); | |
286 | ||
287 | interruptible_sleep_on(&midi_dev->iWait); | |
288 | ||
289 | if (signal_pending(current)) | |
290 | return ret ? ret : -ERESTARTSYS; | |
291 | ||
292 | continue; | |
293 | } | |
294 | ||
295 | if (copy_to_user(buffer, midi_dev->iBuf + midi_dev->ird, cnt)) { | |
296 | ERROR(); | |
297 | return ret ? ret : -EFAULT; | |
298 | } | |
299 | ||
300 | midi_dev->ird += cnt; | |
301 | midi_dev->ird %= MIDIIN_BUFLEN; | |
302 | ||
303 | spin_lock_irqsave(&midi_spinlock, flags); | |
304 | ||
305 | midi_dev->icnt -= cnt; | |
306 | ||
307 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
308 | ||
309 | count -= cnt; | |
310 | buffer += cnt; | |
311 | ret += cnt; | |
312 | ||
313 | if (midi_dev->icnt == 0) | |
314 | break; | |
315 | } | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
320 | static ssize_t emu10k1_midi_write(struct file *file, const char __user *buffer, size_t count, loff_t * pos) | |
321 | { | |
322 | struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data; | |
323 | struct midi_hdr *midihdr; | |
324 | unsigned long flags; | |
325 | ||
326 | DPD(4, "emu10k1_midi_write(), count=%#x\n", (u32) count); | |
327 | ||
328 | if (!access_ok(VERIFY_READ, buffer, count)) | |
329 | return -EFAULT; | |
330 | ||
331 | if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr), GFP_KERNEL)) == NULL) | |
332 | return -EINVAL; | |
333 | ||
334 | midihdr->bufferlength = count; | |
335 | midihdr->bytesrecorded = 0; | |
336 | midihdr->flags = 0; | |
337 | ||
4fa95ef6 JJ |
338 | midihdr->data = kmalloc(count, GFP_KERNEL); |
339 | if (!midihdr->data) { | |
1da177e4 LT |
340 | ERROR(); |
341 | kfree(midihdr); | |
342 | return -EINVAL; | |
343 | } | |
344 | ||
345 | if (copy_from_user(midihdr->data, buffer, count)) { | |
346 | kfree(midihdr->data); | |
347 | kfree(midihdr); | |
348 | return -EFAULT; | |
349 | } | |
350 | ||
351 | spin_lock_irqsave(&midi_spinlock, flags); | |
352 | ||
353 | if (emu10k1_mpuout_add_buffer(midi_dev->card, midihdr) < 0) { | |
354 | ERROR(); | |
355 | kfree(midihdr->data); | |
356 | kfree(midihdr); | |
357 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
362 | ||
363 | return count; | |
364 | } | |
365 | ||
366 | static unsigned int emu10k1_midi_poll(struct file *file, struct poll_table_struct *wait) | |
367 | { | |
368 | struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) file->private_data; | |
369 | unsigned long flags; | |
370 | unsigned int mask = 0; | |
371 | ||
372 | DPF(4, "emu10k1_midi_poll() called\n"); | |
373 | ||
374 | if (file->f_mode & FMODE_WRITE) | |
375 | poll_wait(file, &midi_dev->oWait, wait); | |
376 | ||
377 | if (file->f_mode & FMODE_READ) | |
378 | poll_wait(file, &midi_dev->iWait, wait); | |
379 | ||
380 | spin_lock_irqsave(&midi_spinlock, flags); | |
381 | ||
382 | if (file->f_mode & FMODE_WRITE) | |
383 | mask |= POLLOUT | POLLWRNORM; | |
384 | ||
385 | if (file->f_mode & FMODE_READ) { | |
386 | if (midi_dev->mistate == MIDIIN_STATE_STARTED) | |
387 | if (midi_dev->icnt > 0) | |
388 | mask |= POLLIN | POLLRDNORM; | |
389 | } | |
390 | ||
391 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
392 | ||
393 | return mask; | |
394 | } | |
395 | ||
396 | int emu10k1_midi_callback(unsigned long msg, unsigned long refdata, unsigned long *pmsg) | |
397 | { | |
398 | struct emu10k1_mididevice *midi_dev = (struct emu10k1_mididevice *) refdata; | |
399 | struct midi_hdr *midihdr = NULL; | |
400 | unsigned long flags; | |
401 | int i; | |
402 | ||
403 | DPF(4, "emu10k1_midi_callback()\n"); | |
404 | ||
405 | spin_lock_irqsave(&midi_spinlock, flags); | |
406 | ||
407 | switch (msg) { | |
408 | case ICARDMIDI_OUTLONGDATA: | |
409 | midihdr = (struct midi_hdr *) pmsg[2]; | |
410 | ||
411 | kfree(midihdr->data); | |
412 | kfree(midihdr); | |
413 | wake_up_interruptible(&midi_dev->oWait); | |
414 | ||
415 | break; | |
416 | ||
417 | case ICARDMIDI_INLONGDATA: | |
418 | midihdr = (struct midi_hdr *) pmsg[2]; | |
419 | ||
420 | for (i = 0; i < midihdr->bytesrecorded; i++) { | |
421 | midi_dev->iBuf[midi_dev->iwr++] = midihdr->data[i]; | |
422 | midi_dev->iwr %= MIDIIN_BUFLEN; | |
423 | } | |
424 | ||
425 | midi_dev->icnt += midihdr->bytesrecorded; | |
426 | ||
427 | if (midi_dev->mistate == MIDIIN_STATE_STARTED) { | |
428 | init_midi_hdr(midihdr); | |
429 | emu10k1_mpuin_add_buffer(midi_dev->card->mpuin, midihdr); | |
430 | wake_up_interruptible(&midi_dev->iWait); | |
431 | } | |
432 | break; | |
433 | ||
434 | case ICARDMIDI_INDATA: | |
435 | { | |
436 | u8 *pBuf = (u8 *) & pmsg[1]; | |
437 | u16 bytesvalid = pmsg[2]; | |
438 | ||
439 | for (i = 0; i < bytesvalid; i++) { | |
440 | midi_dev->iBuf[midi_dev->iwr++] = pBuf[i]; | |
441 | midi_dev->iwr %= MIDIIN_BUFLEN; | |
442 | } | |
443 | ||
444 | midi_dev->icnt += bytesvalid; | |
445 | } | |
446 | ||
447 | wake_up_interruptible(&midi_dev->iWait); | |
448 | break; | |
449 | ||
450 | default: /* Unknown message */ | |
451 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
452 | return -1; | |
453 | } | |
454 | ||
455 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
456 | ||
457 | return 0; | |
458 | } | |
459 | ||
460 | /* MIDI file operations */ | |
461 | struct file_operations emu10k1_midi_fops = { | |
462 | .owner = THIS_MODULE, | |
463 | .read = emu10k1_midi_read, | |
464 | .write = emu10k1_midi_write, | |
465 | .poll = emu10k1_midi_poll, | |
466 | .open = emu10k1_midi_open, | |
467 | .release = emu10k1_midi_release, | |
468 | }; | |
469 | ||
470 | ||
471 | #ifdef EMU10K1_SEQUENCER | |
472 | ||
473 | /* functions used for sequencer access */ | |
474 | ||
475 | int emu10k1_seq_midi_open(int dev, int mode, | |
476 | void (*input) (int dev, unsigned char data), | |
477 | void (*output) (int dev)) | |
478 | { | |
479 | struct emu10k1_card *card; | |
480 | struct midi_openinfo dsCardMidiOpenInfo; | |
481 | struct emu10k1_mididevice *midi_dev; | |
482 | ||
483 | if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL) | |
484 | return -EINVAL; | |
485 | ||
486 | card = midi_devs[dev]->devc; | |
487 | ||
488 | if (card->open_mode) /* card is opened native */ | |
489 | return -EBUSY; | |
490 | ||
491 | DPF(2, "emu10k1_seq_midi_open()\n"); | |
492 | ||
493 | if ((midi_dev = (struct emu10k1_mididevice *) kmalloc(sizeof(*midi_dev), GFP_KERNEL)) == NULL) | |
494 | return -EINVAL; | |
495 | ||
496 | midi_dev->card = card; | |
497 | midi_dev->mistate = MIDIIN_STATE_STOPPED; | |
498 | init_waitqueue_head(&midi_dev->oWait); | |
499 | init_waitqueue_head(&midi_dev->iWait); | |
500 | midi_dev->ird = 0; | |
501 | midi_dev->iwr = 0; | |
502 | midi_dev->icnt = 0; | |
503 | INIT_LIST_HEAD(&midi_dev->mid_hdrs); | |
504 | ||
505 | dsCardMidiOpenInfo.refdata = (unsigned long) midi_dev; | |
506 | ||
507 | if (emu10k1_mpuout_open(card, &dsCardMidiOpenInfo) < 0) { | |
508 | ERROR(); | |
509 | return -ENODEV; | |
510 | } | |
511 | ||
512 | card->seq_mididev = midi_dev; | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | void emu10k1_seq_midi_close(int dev) | |
518 | { | |
519 | struct emu10k1_card *card; | |
520 | ||
521 | DPF(2, "emu10k1_seq_midi_close()\n"); | |
522 | if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL) | |
523 | return; | |
524 | ||
525 | card = midi_devs[dev]->devc; | |
526 | emu10k1_mpuout_close(card); | |
527 | ||
09417379 JJ |
528 | kfree(card->seq_mididev); |
529 | card->seq_mididev = NULL; | |
1da177e4 LT |
530 | } |
531 | ||
532 | int emu10k1_seq_midi_out(int dev, unsigned char midi_byte) | |
533 | { | |
534 | struct emu10k1_card *card; | |
535 | struct midi_hdr *midihdr; | |
536 | unsigned long flags; | |
537 | ||
538 | if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL) | |
539 | return -EINVAL; | |
540 | ||
541 | card = midi_devs[dev]->devc; | |
542 | ||
543 | if ((midihdr = (struct midi_hdr *) kmalloc(sizeof(struct midi_hdr), GFP_KERNEL)) == NULL) | |
544 | return -EINVAL; | |
545 | ||
546 | midihdr->bufferlength = 1; | |
547 | midihdr->bytesrecorded = 0; | |
548 | midihdr->flags = 0; | |
549 | ||
4fa95ef6 JJ |
550 | midihdr->data = kmalloc(1, GFP_KERNEL); |
551 | if (!midihdr->data) { | |
1da177e4 LT |
552 | ERROR(); |
553 | kfree(midihdr); | |
554 | return -EINVAL; | |
555 | } | |
556 | ||
557 | *(midihdr->data) = midi_byte; | |
558 | ||
559 | spin_lock_irqsave(&midi_spinlock, flags); | |
560 | ||
561 | if (emu10k1_mpuout_add_buffer(card, midihdr) < 0) { | |
562 | ERROR(); | |
563 | kfree(midihdr->data); | |
564 | kfree(midihdr); | |
565 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
569 | spin_unlock_irqrestore(&midi_spinlock, flags); | |
570 | ||
571 | return 1; | |
572 | } | |
573 | ||
574 | int emu10k1_seq_midi_start_read(int dev) | |
575 | { | |
576 | return 0; | |
577 | } | |
578 | ||
579 | int emu10k1_seq_midi_end_read(int dev) | |
580 | { | |
581 | return 0; | |
582 | } | |
583 | ||
584 | void emu10k1_seq_midi_kick(int dev) | |
585 | { | |
586 | } | |
587 | ||
588 | int emu10k1_seq_midi_buffer_status(int dev) | |
589 | { | |
590 | int count; | |
591 | struct midi_queue *queue; | |
592 | struct emu10k1_card *card; | |
593 | ||
594 | if (midi_devs[dev] == NULL || midi_devs[dev]->devc == NULL) | |
595 | return -EINVAL; | |
596 | ||
597 | count = 0; | |
598 | ||
599 | card = midi_devs[dev]->devc; | |
600 | queue = card->mpuout->firstmidiq; | |
601 | ||
602 | while (queue != NULL) { | |
603 | count++; | |
604 | if (queue == card->mpuout->lastmidiq) | |
605 | break; | |
606 | ||
607 | queue = queue->next; | |
608 | } | |
609 | ||
610 | return count; | |
611 | } | |
612 | ||
613 | #endif | |
614 |