1 /*
2 * linux/sound/oss/soundcard.c
3 *
4 * Sound card driver for Linux
5 *
6 *
7 * Copyright (C) by Hannu Savolainen 1993-1997
8 *
9 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
10 * Version 2 (June 1991). See the "COPYING" file distributed with this software
11 * for more info.
12 *
13 *
14 * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
15 * integrated sound_switch.c
16 * Stefan Reinauer : integrated /proc/sound (equals to /dev/sndstat,
17 * which should disappear in the near future)
18 * Eric Dumas : devfs support (22-Jan-98) <dumas@linux.eu.org> with
19 * fixups by C. Scott Ananian <cananian@alumni.princeton.edu>
20 * Richard Gooch : moved common (non OSS-specific) devices to sound_core.c
21 * Rob Riggs : Added persistent DMA buffers support (1998/10/17)
22 * Christoph Hellwig : Some cleanup work (2000/03/01)
23 */
24
25
26 #include "sound_config.h"
27 #include <linux/init.h>
28 #include <linux/types.h>
29 #include <linux/errno.h>
30 #include <linux/signal.h>
31 #include <linux/fcntl.h>
32 #include <linux/ctype.h>
33 #include <linux/stddef.h>
34 #include <linux/kmod.h>
35 #include <linux/kernel.h>
36 #include <asm/dma.h>
37 #include <asm/io.h>
38 #include <linux/wait.h>
39 #include <linux/ioport.h>
40 #include <linux/major.h>
41 #include <linux/delay.h>
42 #include <linux/proc_fs.h>
43 #include <linux/mutex.h>
44 #include <linux/module.h>
45 #include <linux/mm.h>
46 #include <linux/device.h>
47
48 /*
49 * This ought to be moved into include/asm/dma.h
50 */
51 #ifndef valid_dma
52 #define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
53 #endif
54
55 /*
56 * Table for permanently allocated memory (used when unloading the module)
57 */
58 void * sound_mem_blocks[MAX_MEM_BLOCKS];
59 static DEFINE_MUTEX(soundcard_mutex);
60 int sound_nblocks = 0;
61
62 /* Persistent DMA buffers */
63 #ifdef CONFIG_SOUND_DMAP
64 int sound_dmap_flag = 1;
65 #else
66 int sound_dmap_flag = 0;
67 #endif
68
69 static char dma_alloc_map[MAX_DMA_CHANNELS];
70
71 #define DMA_MAP_UNAVAIL 0
72 #define DMA_MAP_FREE 1
73 #define DMA_MAP_BUSY 2
74
75
76 unsigned long seq_time = 0; /* Time for /dev/sequencer */
77 extern struct class *sound_class;
78
79 /*
80 * Table for configurable mixer volume handling
81 */
82 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
83 static int num_mixer_volumes;
84
85 int *load_mixer_volumes(char *name, int *levels, int present)
86 {
87 int i, n;
88
89 for (i = 0; i < num_mixer_volumes; i++) {
90 if (strncmp(name, mixer_vols[i].name, 32) == 0) {
91 if (present)
92 mixer_vols[i].num = i;
93 return mixer_vols[i].levels;
94 }
95 }
96 if (num_mixer_volumes >= MAX_MIXER_DEV) {
97 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
98 return levels;
99 }
100 n = num_mixer_volumes++;
101
102 strncpy(mixer_vols[n].name, name, 32);
103
104 if (present)
105 mixer_vols[n].num = n;
106 else
107 mixer_vols[n].num = -1;
108
109 for (i = 0; i < 32; i++)
110 mixer_vols[n].levels[i] = levels[i];
111 return mixer_vols[n].levels;
112 }
113 EXPORT_SYMBOL(load_mixer_volumes);
114
115 static int set_mixer_levels(void __user * arg)
116 {
117 /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
118 mixer_vol_table buf;
119
120 if (__copy_from_user(&buf, arg, sizeof(buf)))
121 return -EFAULT;
122 load_mixer_volumes(buf.name, buf.levels, 0);
123 if (__copy_to_user(arg, &buf, sizeof(buf)))
124 return -EFAULT;
125 return 0;
126 }
127
128 static int get_mixer_levels(void __user * arg)
129 {
130 int n;
131
132 if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
133 return -EFAULT;
134 if (n < 0 || n >= num_mixer_volumes)
135 return -EINVAL;
136 if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
137 return -EFAULT;
138 return 0;
139 }
140
141 /* 4K page size but our output routines use some slack for overruns */
142 #define PROC_BLOCK_SIZE (3*1024)
143
144 static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
145 {
146 int dev = iminor(file_inode(file));
147 int ret = -EINVAL;
148
149 /*
150 * The OSS drivers aren't remotely happy without this locking,
151 * and unless someone fixes them when they are about to bite the
152 * big one anyway, we might as well bandage here..
153 */
154
155 mutex_lock(&soundcard_mutex);
156
157 switch (dev & 0x0f) {
158 case SND_DEV_DSP:
159 case SND_DEV_DSP16:
160 case SND_DEV_AUDIO:
161 ret = audio_read(dev, file, buf, count);
162 break;
163
164 case SND_DEV_SEQ:
165 case SND_DEV_SEQ2:
166 ret = sequencer_read(dev, file, buf, count);
167 break;
168
169 case SND_DEV_MIDIN:
170 ret = MIDIbuf_read(dev, file, buf, count);
171 }
172 mutex_unlock(&soundcard_mutex);
173 return ret;
174 }
175
176 static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
177 {
178 int dev = iminor(file_inode(file));
179 int ret = -EINVAL;
180
181 mutex_lock(&soundcard_mutex);
182 switch (dev & 0x0f) {
183 case SND_DEV_SEQ:
184 case SND_DEV_SEQ2:
185 ret = sequencer_write(dev, file, buf, count);
186 break;
187
188 case SND_DEV_DSP:
189 case SND_DEV_DSP16:
190 case SND_DEV_AUDIO:
191 ret = audio_write(dev, file, buf, count);
192 break;
193
194 case SND_DEV_MIDIN:
195 ret = MIDIbuf_write(dev, file, buf, count);
196 break;
197 }
198 mutex_unlock(&soundcard_mutex);
199 return ret;
200 }
201
202 static int sound_open(struct inode *inode, struct file *file)
203 {
204 int dev = iminor(inode);
205 int retval;
206
207 if ((dev >= SND_NDEVS) || (dev < 0)) {
208 printk(KERN_ERR "Invalid minor device %d\n", dev);
209 return -ENXIO;
210 }
211 mutex_lock(&soundcard_mutex);
212 switch (dev & 0x0f) {
213 case SND_DEV_CTL:
214 dev >>= 4;
215 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
216 request_module("mixer%d", dev);
217 }
218 retval = -ENXIO;
219 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
220 break;
221
222 if (!try_module_get(mixer_devs[dev]->owner))
223 break;
224
225 retval = 0;
226 break;
227
228 case SND_DEV_SEQ:
229 case SND_DEV_SEQ2:
230 retval = sequencer_open(dev, file);
231 break;
232
233 case SND_DEV_MIDIN:
234 retval = MIDIbuf_open(dev, file);
235 break;
236
237 case SND_DEV_DSP:
238 case SND_DEV_DSP16:
239 case SND_DEV_AUDIO:
240 retval = audio_open(dev, file);
241 break;
242
243 default:
244 printk(KERN_ERR "Invalid minor device %d\n", dev);
245 retval = -ENXIO;
246 }
247
248 mutex_unlock(&soundcard_mutex);
249 return retval;
250 }
251
252 static int sound_release(struct inode *inode, struct file *file)
253 {
254 int dev = iminor(inode);
255
256 mutex_lock(&soundcard_mutex);
257 switch (dev & 0x0f) {
258 case SND_DEV_CTL:
259 module_put(mixer_devs[dev >> 4]->owner);
260 break;
261
262 case SND_DEV_SEQ:
263 case SND_DEV_SEQ2:
264 sequencer_release(dev, file);
265 break;
266
267 case SND_DEV_MIDIN:
268 MIDIbuf_release(dev, file);
269 break;
270
271 case SND_DEV_DSP:
272 case SND_DEV_DSP16:
273 case SND_DEV_AUDIO:
274 audio_release(dev, file);
275 break;
276
277 default:
278 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
279 }
280 mutex_unlock(&soundcard_mutex);
281
282 return 0;
283 }
284
285 static int get_mixer_info(int dev, void __user *arg)
286 {
287 mixer_info info;
288 memset(&info, 0, sizeof(info));
289 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
290 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
291 info.modify_counter = mixer_devs[dev]->modify_counter;
292 if (__copy_to_user(arg, &info, sizeof(info)))
293 return -EFAULT;
294 return 0;
295 }
296
297 static int get_old_mixer_info(int dev, void __user *arg)
298 {
299 _old_mixer_info info;
300 memset(&info, 0, sizeof(info));
301 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
302 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
303 if (copy_to_user(arg, &info, sizeof(info)))
304 return -EFAULT;
305 return 0;
306 }
307
308 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
309 {
310 if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
311 return -ENXIO;
312 /* Try to load the mixer... */
313 if (mixer_devs[mixdev] == NULL) {
314 request_module("mixer%d", mixdev);
315 }
316 if (mixdev >= num_mixers || !mixer_devs[mixdev])
317 return -ENXIO;
318 if (cmd == SOUND_MIXER_INFO)
319 return get_mixer_info(mixdev, arg);
320 if (cmd == SOUND_OLD_MIXER_INFO)
321 return get_old_mixer_info(mixdev, arg);
322 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
323 mixer_devs[mixdev]->modify_counter++;
324 if (!mixer_devs[mixdev]->ioctl)
325 return -EINVAL;
326 return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
327 }
328
329 static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
330 {
331 int len = 0, dtype;
332 int dev = iminor(file_inode(file));
333 long ret = -EINVAL;
334 void __user *p = (void __user *)arg;
335
336 if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
337 /*
338 * Have to validate the address given by the process.
339 */
340 len = _SIOC_SIZE(cmd);
341 if (len < 1 || len > 65536 || !p)
342 return -EFAULT;
343 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
344 if (!access_ok(VERIFY_READ, p, len))
345 return -EFAULT;
346 if (_SIOC_DIR(cmd) & _SIOC_READ)
347 if (!access_ok(VERIFY_WRITE, p, len))
348 return -EFAULT;
349 }
350 if (cmd == OSS_GETVERSION)
351 return __put_user(SOUND_VERSION, (int __user *)p);
352
353 mutex_lock(&soundcard_mutex);
354 if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
355 (dev & 0x0f) != SND_DEV_CTL) {
356 dtype = dev & 0x0f;
357 switch (dtype) {
358 case SND_DEV_DSP:
359 case SND_DEV_DSP16:
360 case SND_DEV_AUDIO:
361 ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
362 cmd, p);
363 break;
364 default:
365 ret = sound_mixer_ioctl(dev >> 4, cmd, p);
366 break;
367 }
368 mutex_unlock(&soundcard_mutex);
369 return ret;
370 }
371
372 switch (dev & 0x0f) {
373 case SND_DEV_CTL:
374 if (cmd == SOUND_MIXER_GETLEVELS)
375 ret = get_mixer_levels(p);
376 else if (cmd == SOUND_MIXER_SETLEVELS)
377 ret = set_mixer_levels(p);
378 else
379 ret = sound_mixer_ioctl(dev >> 4, cmd, p);
380 break;
381
382 case SND_DEV_SEQ:
383 case SND_DEV_SEQ2:
384 ret = sequencer_ioctl(dev, file, cmd, p);
385 break;
386
387 case SND_DEV_DSP:
388 case SND_DEV_DSP16:
389 case SND_DEV_AUDIO:
390 ret = audio_ioctl(dev, file, cmd, p);
391 break;
392
393 case SND_DEV_MIDIN:
394 ret = MIDIbuf_ioctl(dev, file, cmd, p);
395 break;
396
397 }
398 mutex_unlock(&soundcard_mutex);
399 return ret;
400 }
401
402 static unsigned int sound_poll(struct file *file, poll_table * wait)
403 {
404 struct inode *inode = file_inode(file);
405 int dev = iminor(inode);
406
407 switch (dev & 0x0f) {
408 case SND_DEV_SEQ:
409 case SND_DEV_SEQ2:
410 return sequencer_poll(dev, file, wait);
411
412 case SND_DEV_MIDIN:
413 return MIDIbuf_poll(dev, file, wait);
414
415 case SND_DEV_DSP:
416 case SND_DEV_DSP16:
417 case SND_DEV_AUDIO:
418 return DMAbuf_poll(file, dev >> 4, wait);
419 }
420 return 0;
421 }
422
423 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
424 {
425 int dev_class;
426 unsigned long size;
427 struct dma_buffparms *dmap = NULL;
428 int dev = iminor(file_inode(file));
429
430 dev_class = dev & 0x0f;
431 dev >>= 4;
432
433 if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
434 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
435 return -EINVAL;
436 }
437 mutex_lock(&soundcard_mutex);
438 if (vma->vm_flags & VM_WRITE) /* Map write and read/write to the output buf */
439 dmap = audio_devs[dev]->dmap_out;
440 else if (vma->vm_flags & VM_READ)
441 dmap = audio_devs[dev]->dmap_in;
442 else {
443 printk(KERN_ERR "Sound: Undefined mmap() access\n");
444 mutex_unlock(&soundcard_mutex);
445 return -EINVAL;
446 }
447
448 if (dmap == NULL) {
449 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
450 mutex_unlock(&soundcard_mutex);
451 return -EIO;
452 }
453 if (dmap->raw_buf == NULL) {
454 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
455 mutex_unlock(&soundcard_mutex);
456 return -EIO;
457 }
458 if (dmap->mapping_flags) {
459 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
460 mutex_unlock(&soundcard_mutex);
461 return -EIO;
462 }
463 if (vma->vm_pgoff != 0) {
464 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
465 mutex_unlock(&soundcard_mutex);
466 return -EINVAL;
467 }
468 size = vma->vm_end - vma->vm_start;
469
470 if (size != dmap->bytes_in_use) {
471 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
472 }
473 if (remap_pfn_range(vma, vma->vm_start,
474 virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
475 vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
476 mutex_unlock(&soundcard_mutex);
477 return -EAGAIN;
478 }
479
480 dmap->mapping_flags |= DMA_MAP_MAPPED;
481
482 if( audio_devs[dev]->d->mmap)
483 audio_devs[dev]->d->mmap(dev);
484
485 memset(dmap->raw_buf,
486 dmap->neutral_byte,
487 dmap->bytes_in_use);
488 mutex_unlock(&soundcard_mutex);
489 return 0;
490 }
491
492 const struct file_operations oss_sound_fops = {
493 .owner = THIS_MODULE,
494 .llseek = no_llseek,
495 .read = sound_read,
496 .write = sound_write,
497 .poll = sound_poll,
498 .unlocked_ioctl = sound_ioctl,
499 .mmap = sound_mmap,
500 .open = sound_open,
501 .release = sound_release,
502 };
503
504 /*
505 * Create the required special subdevices
506 */
507
508 static int create_special_devices(void)
509 {
510 int seq1,seq2;
511 seq1=register_sound_special(&oss_sound_fops, 1);
512 if(seq1==-1)
513 goto bad;
514 seq2=register_sound_special(&oss_sound_fops, 8);
515 if(seq2!=-1)
516 return 0;
517 unregister_sound_special(1);
518 bad:
519 return -1;
520 }
521
522
523 static int dmabuf;
524 static int dmabug;
525
526 module_param(dmabuf, int, 0444);
527 module_param(dmabug, int, 0444);
528
529 /* additional minors for compatibility */
530 struct oss_minor_dev {
531 unsigned short minor;
532 unsigned int enabled;
533 } dev_list[] = {
534 { SND_DEV_DSP16 },
535 { SND_DEV_AUDIO },
536 };
537
538 static int __init oss_init(void)
539 {
540 int err;
541 int i, j;
542
543 #ifdef CONFIG_PCI
544 if(dmabug)
545 isa_dma_bridge_buggy = dmabug;
546 #endif
547
548 err = create_special_devices();
549 if (err) {
550 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
551 return err;
552 }
553
554 /* Protecting the innocent */
555 sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
556
557 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
558 j = 0;
559 do {
560 unsigned short minor = dev_list[i].minor + j * 0x10;
561 if (!register_sound_special(&oss_sound_fops, minor))
562 dev_list[i].enabled = (1 << j);
563 } while (++j < num_audiodevs);
564 }
565
566 if (sound_nblocks >= MAX_MEM_BLOCKS - 1)
567 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
568
569 return 0;
570 }
571
572 static void __exit oss_cleanup(void)
573 {
574 int i, j;
575
576 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
577 j = 0;
578 do {
579 if (dev_list[i].enabled & (1 << j))
580 unregister_sound_special(dev_list[i].minor);
581 } while (++j < num_audiodevs);
582 }
583
584 unregister_sound_special(1);
585 unregister_sound_special(8);
586
587 sound_stop_timer();
588
589 sequencer_unload();
590
591 for (i = 0; i < MAX_DMA_CHANNELS; i++)
592 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
593 printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
594 sound_free_dma(i);
595 }
596
597 for (i = 0; i < sound_nblocks; i++)
598 vfree(sound_mem_blocks[i]);
599
600 }
601
602 module_init(oss_init);
603 module_exit(oss_cleanup);
604 MODULE_LICENSE("GPL");
605 MODULE_DESCRIPTION("OSS Sound subsystem");
606 MODULE_AUTHOR("Hannu Savolainen, et al.");
607
608
609 int sound_alloc_dma(int chn, char *deviceID)
610 {
611 int err;
612
613 if ((err = request_dma(chn, deviceID)) != 0)
614 return err;
615
616 dma_alloc_map[chn] = DMA_MAP_FREE;
617
618 return 0;
619 }
620 EXPORT_SYMBOL(sound_alloc_dma);
621
622 int sound_open_dma(int chn, char *deviceID)
623 {
624 if (!valid_dma(chn)) {
625 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
626 return 1;
627 }
628
629 if (dma_alloc_map[chn] != DMA_MAP_FREE) {
630 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
631 return 1;
632 }
633 dma_alloc_map[chn] = DMA_MAP_BUSY;
634 return 0;
635 }
636 EXPORT_SYMBOL(sound_open_dma);
637
638 void sound_free_dma(int chn)
639 {
640 if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
641 /* printk( "sound_free_dma: Bad access to DMA channel %d\n", chn); */
642 return;
643 }
644 free_dma(chn);
645 dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
646 }
647 EXPORT_SYMBOL(sound_free_dma);
648
649 void sound_close_dma(int chn)
650 {
651 if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
652 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
653 return;
654 }
655 dma_alloc_map[chn] = DMA_MAP_FREE;
656 }
657 EXPORT_SYMBOL(sound_close_dma);
658
659 static void do_sequencer_timer(unsigned long dummy)
660 {
661 sequencer_timer(0);
662 }
663
664
665 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
666
667 void request_sound_timer(int count)
668 {
669 extern unsigned long seq_time;
670
671 if (count < 0) {
672 seq_timer.expires = (-count) + jiffies;
673 add_timer(&seq_timer);
674 return;
675 }
676 count += seq_time;
677
678 count -= jiffies;
679
680 if (count < 1)
681 count = 1;
682
683 seq_timer.expires = (count) + jiffies;
684 add_timer(&seq_timer);
685 }
686
687 void sound_stop_timer(void)
688 {
689 del_timer(&seq_timer);
690 }
691
692 void conf_printf(char *name, struct address_info *hw_config)
693 {
694 #ifndef CONFIG_SOUND_TRACEINIT
695 return;
696 #else
697 printk("<%s> at 0x%03x", name, hw_config->io_base);
698
699 if (hw_config->irq)
700 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
701
702 if (hw_config->dma != -1 || hw_config->dma2 != -1)
703 {
704 printk(" dma %d", hw_config->dma);
705 if (hw_config->dma2 != -1)
706 printk(",%d", hw_config->dma2);
707 }
708 printk("\n");
709 #endif
710 }
711 EXPORT_SYMBOL(conf_printf);
712
713 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
714 {
715 #ifndef CONFIG_SOUND_TRACEINIT
716 return;
717 #else
718 printk("<%s> at 0x%03x", name, base);
719
720 if (irq)
721 printk(" irq %d", (irq > 0) ? irq : -irq);
722
723 if (dma != -1 || dma2 != -1)
724 {
725 printk(" dma %d", dma);
726 if (dma2 != -1)
727 printk(",%d", dma2);
728 }
729 printk("\n");
730 #endif
731 }
732 EXPORT_SYMBOL(conf_printf2);
733
734
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