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security: prevent permission checking of file removal via sysfs_remove_group()
[linux-2.6/linux-2.6-openrd.git] / sound / core / seq / seq_midi_event.c
blob5ff80b776906cc32dd9fd3aea0bfd06a8b469806
1 /*
2 * MIDI byte <-> sequencer event coder
3 *
4 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
5 * Jaroslav Kysela <perex@suse.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <sound/driver.h>
23 #include <linux/slab.h>
24 #include <linux/errno.h>
25 #include <linux/string.h>
26 #include <sound/core.h>
27 #include <sound/seq_kernel.h>
28 #include <sound/seq_midi_event.h>
29 #include <sound/asoundef.h>
30
31 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@suse.cz>");
32 MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
33 MODULE_LICENSE("GPL");
34
35 /* queue type */
36 /* from 0 to 7 are normal commands (note off, on, etc.) */
37 #define ST_NOTEOFF 0
38 #define ST_NOTEON 1
39 #define ST_SPECIAL 8
40 #define ST_SYSEX ST_SPECIAL
41 /* from 8 to 15 are events for 0xf0-0xf7 */
42
43
44 /*
45 * prototypes
46 */
47 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
48 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
49 static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
50 static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
51 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
52 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
53 static void note_decode(struct snd_seq_event *ev, unsigned char *buf);
54 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf);
55 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf);
56 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf);
57 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf);
58
59 /*
60 * event list
61 */
62 static struct status_event_list {
63 int event;
64 int qlen;
65 void (*encode)(struct snd_midi_event *dev, struct snd_seq_event *ev);
66 void (*decode)(struct snd_seq_event *ev, unsigned char *buf);
67 } status_event[] = {
68 /* 0x80 - 0xf0 */
69 {SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
70 {SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
71 {SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
72 {SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
73 {SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
74 {SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
75 {SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
76 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf0 */
77 /* 0xf0 - 0xff */
78 {SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
79 {SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
80 {SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
81 {SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
82 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf4 */
83 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */
84 {SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
85 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */
86 {SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
87 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf9 */
88 {SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
89 {SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
90 {SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
91 {SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xfd */
92 {SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
93 {SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
94 };
95
96 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf, int len,
97 struct snd_seq_event *ev);
98 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf, int count,
99 struct snd_seq_event *ev);
100
101 static struct extra_event_list {
102 int event;
103 int (*decode)(struct snd_midi_event *dev, unsigned char *buf, int len,
104 struct snd_seq_event *ev);
105 } extra_event[] = {
106 {SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
107 {SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
108 {SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
109 };
110
111 /*
112 * new/delete record
113 */
114
115 int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
116 {
117 struct snd_midi_event *dev;
118
119 *rdev = NULL;
120 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
121 if (dev == NULL)
122 return -ENOMEM;
123 if (bufsize > 0) {
124 dev->buf = kmalloc(bufsize, GFP_KERNEL);
125 if (dev->buf == NULL) {
126 kfree(dev);
127 return -ENOMEM;
128 }
129 }
130 dev->bufsize = bufsize;
131 dev->lastcmd = 0xff;
132 spin_lock_init(&dev->lock);
133 *rdev = dev;
134 return 0;
135 }
136
137 void snd_midi_event_free(struct snd_midi_event *dev)
138 {
139 if (dev != NULL) {
140 kfree(dev->buf);
141 kfree(dev);
142 }
143 }
144
145 /*
146 * initialize record
147 */
148 static inline void reset_encode(struct snd_midi_event *dev)
149 {
150 dev->read = 0;
151 dev->qlen = 0;
152 dev->type = 0;
153 }
154
155 void snd_midi_event_reset_encode(struct snd_midi_event *dev)
156 {
157 unsigned long flags;
158
159 spin_lock_irqsave(&dev->lock, flags);
160 reset_encode(dev);
161 spin_unlock_irqrestore(&dev->lock, flags);
162 }
163
164 void snd_midi_event_reset_decode(struct snd_midi_event *dev)
165 {
166 unsigned long flags;
167
168 spin_lock_irqsave(&dev->lock, flags);
169 dev->lastcmd = 0xff;
170 spin_unlock_irqrestore(&dev->lock, flags);
171 }
172
173 #if 0
174 void snd_midi_event_init(struct snd_midi_event *dev)
175 {
176 snd_midi_event_reset_encode(dev);
177 snd_midi_event_reset_decode(dev);
178 }
179 #endif /* 0 */
180
181 void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
182 {
183 dev->nostat = on ? 1 : 0;
184 }
185
186 /*
187 * resize buffer
188 */
189 #if 0
190 int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
191 {
192 unsigned char *new_buf, *old_buf;
193 unsigned long flags;
194
195 if (bufsize == dev->bufsize)
196 return 0;
197 new_buf = kmalloc(bufsize, GFP_KERNEL);
198 if (new_buf == NULL)
199 return -ENOMEM;
200 spin_lock_irqsave(&dev->lock, flags);
201 old_buf = dev->buf;
202 dev->buf = new_buf;
203 dev->bufsize = bufsize;
204 reset_encode(dev);
205 spin_unlock_irqrestore(&dev->lock, flags);
206 kfree(old_buf);
207 return 0;
208 }
209 #endif /* 0 */
210
211 /*
212 * read bytes and encode to sequencer event if finished
213 * return the size of encoded bytes
214 */
215 long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
216 struct snd_seq_event *ev)
217 {
218 long result = 0;
219 int rc;
220
221 ev->type = SNDRV_SEQ_EVENT_NONE;
222
223 while (count-- > 0) {
224 rc = snd_midi_event_encode_byte(dev, *buf++, ev);
225 result++;
226 if (rc < 0)
227 return rc;
228 else if (rc > 0)
229 return result;
230 }
231
232 return result;
233 }
234
235 /*
236 * read one byte and encode to sequencer event:
237 * return 1 if MIDI bytes are encoded to an event
238 * 0 data is not finished
239 * negative for error
240 */
241 int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
242 struct snd_seq_event *ev)
243 {
244 int rc = 0;
245 unsigned long flags;
246
247 c &= 0xff;
248
249 if (c >= MIDI_CMD_COMMON_CLOCK) {
250 /* real-time event */
251 ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
252 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
253 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
254 return 1;
255 }
256
257 spin_lock_irqsave(&dev->lock, flags);
258 if (dev->qlen > 0) {
259 /* rest of command */
260 dev->buf[dev->read++] = c;
261 if (dev->type != ST_SYSEX)
262 dev->qlen--;
263 } else {
264 /* new command */
265 dev->read = 1;
266 if (c & 0x80) {
267 dev->buf[0] = c;
268 if ((c & 0xf0) == 0xf0) /* special events */
269 dev->type = (c & 0x0f) + ST_SPECIAL;
270 else
271 dev->type = (c >> 4) & 0x07;
272 dev->qlen = status_event[dev->type].qlen;
273 } else {
274 /* process this byte as argument */
275 dev->buf[dev->read++] = c;
276 dev->qlen = status_event[dev->type].qlen - 1;
277 }
278 }
279 if (dev->qlen == 0) {
280 ev->type = status_event[dev->type].event;
281 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
282 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
283 if (status_event[dev->type].encode) /* set data values */
284 status_event[dev->type].encode(dev, ev);
285 rc = 1;
286 } else if (dev->type == ST_SYSEX) {
287 if (c == MIDI_CMD_COMMON_SYSEX_END ||
288 dev->read >= dev->bufsize) {
289 ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
290 ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
291 ev->type = SNDRV_SEQ_EVENT_SYSEX;
292 ev->data.ext.len = dev->read;
293 ev->data.ext.ptr = dev->buf;
294 if (c != MIDI_CMD_COMMON_SYSEX_END)
295 dev->read = 0; /* continue to parse */
296 else
297 reset_encode(dev); /* all parsed */
298 rc = 1;
299 }
300 }
301
302 spin_unlock_irqrestore(&dev->lock, flags);
303 return rc;
304 }
305
306 /* encode note event */
307 static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
308 {
309 ev->data.note.channel = dev->buf[0] & 0x0f;
310 ev->data.note.note = dev->buf[1];
311 ev->data.note.velocity = dev->buf[2];
312 }
313
314 /* encode one parameter controls */
315 static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
316 {
317 ev->data.control.channel = dev->buf[0] & 0x0f;
318 ev->data.control.value = dev->buf[1];
319 }
320
321 /* encode pitch wheel change */
322 static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
323 {
324 ev->data.control.channel = dev->buf[0] & 0x0f;
325 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
326 }
327
328 /* encode midi control change */
329 static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
330 {
331 ev->data.control.channel = dev->buf[0] & 0x0f;
332 ev->data.control.param = dev->buf[1];
333 ev->data.control.value = dev->buf[2];
334 }
335
336 /* encode one parameter value*/
337 static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
338 {
339 ev->data.control.value = dev->buf[1];
340 }
341
342 /* encode song position */
343 static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
344 {
345 ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
346 }
347
348 /*
349 * decode from a sequencer event to midi bytes
350 * return the size of decoded midi events
351 */
352 long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
353 struct snd_seq_event *ev)
354 {
355 unsigned int cmd, type;
356
357 if (ev->type == SNDRV_SEQ_EVENT_NONE)
358 return -ENOENT;
359
360 for (type = 0; type < ARRAY_SIZE(status_event); type++) {
361 if (ev->type == status_event[type].event)
362 goto __found;
363 }
364 for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
365 if (ev->type == extra_event[type].event)
366 return extra_event[type].decode(dev, buf, count, ev);
367 }
368 return -ENOENT;
369
370 __found:
371 if (type >= ST_SPECIAL)
372 cmd = 0xf0 + (type - ST_SPECIAL);
373 else
374 /* data.note.channel and data.control.channel is identical */
375 cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
376
377
378 if (cmd == MIDI_CMD_COMMON_SYSEX) {
379 snd_midi_event_reset_decode(dev);
380 return snd_seq_expand_var_event(ev, count, buf, 1, 0);
381 } else {
382 int qlen;
383 unsigned char xbuf[4];
384 unsigned long flags;
385
386 spin_lock_irqsave(&dev->lock, flags);
387 if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
388 dev->lastcmd = cmd;
389 spin_unlock_irqrestore(&dev->lock, flags);
390 xbuf[0] = cmd;
391 if (status_event[type].decode)
392 status_event[type].decode(ev, xbuf + 1);
393 qlen = status_event[type].qlen + 1;
394 } else {
395 spin_unlock_irqrestore(&dev->lock, flags);
396 if (status_event[type].decode)
397 status_event[type].decode(ev, xbuf + 0);
398 qlen = status_event[type].qlen;
399 }
400 if (count < qlen)
401 return -ENOMEM;
402 memcpy(buf, xbuf, qlen);
403 return qlen;
404 }
405 }
406
407
408 /* decode note event */
409 static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
410 {
411 buf[0] = ev->data.note.note & 0x7f;
412 buf[1] = ev->data.note.velocity & 0x7f;
413 }
414
415 /* decode one parameter controls */
416 static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
417 {
418 buf[0] = ev->data.control.value & 0x7f;
419 }
420
421 /* decode pitch wheel change */
422 static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
423 {
424 int value = ev->data.control.value + 8192;
425 buf[0] = value & 0x7f;
426 buf[1] = (value >> 7) & 0x7f;
427 }
428
429 /* decode midi control change */
430 static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
431 {
432 buf[0] = ev->data.control.param & 0x7f;
433 buf[1] = ev->data.control.value & 0x7f;
434 }
435
436 /* decode song position */
437 static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
438 {
439 buf[0] = ev->data.control.value & 0x7f;
440 buf[1] = (ev->data.control.value >> 7) & 0x7f;
441 }
442
443 /* decode 14bit control */
444 static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
445 int count, struct snd_seq_event *ev)
446 {
447 unsigned char cmd;
448 int idx = 0;
449
450 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
451 if (ev->data.control.param < 0x20) {
452 if (count < 4)
453 return -ENOMEM;
454 if (dev->nostat && count < 6)
455 return -ENOMEM;
456 if (cmd != dev->lastcmd || dev->nostat) {
457 if (count < 5)
458 return -ENOMEM;
459 buf[idx++] = dev->lastcmd = cmd;
460 }
461 buf[idx++] = ev->data.control.param;
462 buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
463 if (dev->nostat)
464 buf[idx++] = cmd;
465 buf[idx++] = ev->data.control.param + 0x20;
466 buf[idx++] = ev->data.control.value & 0x7f;
467 } else {
468 if (count < 2)
469 return -ENOMEM;
470 if (cmd != dev->lastcmd || dev->nostat) {
471 if (count < 3)
472 return -ENOMEM;
473 buf[idx++] = dev->lastcmd = cmd;
474 }
475 buf[idx++] = ev->data.control.param & 0x7f;
476 buf[idx++] = ev->data.control.value & 0x7f;
477 }
478 return idx;
479 }
480
481 /* decode reg/nonreg param */
482 static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
483 int count, struct snd_seq_event *ev)
484 {
485 unsigned char cmd;
486 char *cbytes;
487 static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
488 MIDI_CTL_NONREG_PARM_NUM_LSB,
489 MIDI_CTL_MSB_DATA_ENTRY,
490 MIDI_CTL_LSB_DATA_ENTRY };
491 static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
492 MIDI_CTL_REGIST_PARM_NUM_LSB,
493 MIDI_CTL_MSB_DATA_ENTRY,
494 MIDI_CTL_LSB_DATA_ENTRY };
495 unsigned char bytes[4];
496 int idx = 0, i;
497
498 if (count < 8)
499 return -ENOMEM;
500 if (dev->nostat && count < 12)
501 return -ENOMEM;
502 cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
503 bytes[0] = ev->data.control.param & 0x007f;
504 bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
505 bytes[2] = ev->data.control.value & 0x007f;
506 bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
507 if (cmd != dev->lastcmd && !dev->nostat) {
508 if (count < 9)
509 return -ENOMEM;
510 buf[idx++] = dev->lastcmd = cmd;
511 }
512 cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
513 for (i = 0; i < 4; i++) {
514 if (dev->nostat)
515 buf[idx++] = dev->lastcmd = cmd;
516 buf[idx++] = cbytes[i];
517 buf[idx++] = bytes[i];
518 }
519 return idx;
520 }
521
522 /*
523 * exports
524 */
525
526 EXPORT_SYMBOL(snd_midi_event_new);
527 EXPORT_SYMBOL(snd_midi_event_free);
528 EXPORT_SYMBOL(snd_midi_event_reset_encode);
529 EXPORT_SYMBOL(snd_midi_event_reset_decode);
530 EXPORT_SYMBOL(snd_midi_event_no_status);
531 EXPORT_SYMBOL(snd_midi_event_encode);
532 EXPORT_SYMBOL(snd_midi_event_encode_byte);
533 EXPORT_SYMBOL(snd_midi_event_decode);
534
535 static int __init alsa_seq_midi_event_init(void)
536 {
537 return 0;
538 }
539
540 static void __exit alsa_seq_midi_event_exit(void)
541 {
542 }
543
544 module_init(alsa_seq_midi_event_init)
545 module_exit(alsa_seq_midi_event_exit)
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