2 * linux/sound/oss/soundcard.c
4 * Sound card driver for Linux
7 * Copyright (C) by Hannu Savolainen 1993-1997
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
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)
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>
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>
46 #include <linux/device.h>
49 * This ought to be moved into include/asm/dma.h
52 #define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
56 * Table for permanently allocated memory (used when unloading the module)
58 void * sound_mem_blocks[MAX_MEM_BLOCKS];
59 static DEFINE_MUTEX(soundcard_mutex);
60 int sound_nblocks = 0;
62 /* Persistent DMA buffers */
63 #ifdef CONFIG_SOUND_DMAP
64 int sound_dmap_flag = 1;
66 int sound_dmap_flag = 0;
69 static char dma_alloc_map[MAX_DMA_CHANNELS];
71 #define DMA_MAP_UNAVAIL 0
72 #define DMA_MAP_FREE 1
73 #define DMA_MAP_BUSY 2
76 unsigned long seq_time = 0; /* Time for /dev/sequencer */
77 extern struct class *sound_class;
80 * Table for configurable mixer volume handling
82 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
83 static int num_mixer_volumes;
85 int *load_mixer_volumes(char *name, int *levels, int present)
89 for (i = 0; i < num_mixer_volumes; i++) {
90 if (strncmp(name, mixer_vols[i].name, 32) == 0) {
92 mixer_vols[i].num = i;
93 return mixer_vols[i].levels;
96 if (num_mixer_volumes >= MAX_MIXER_DEV) {
97 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
100 n = num_mixer_volumes++;
102 strncpy(mixer_vols[n].name, name, 32);
105 mixer_vols[n].num = n;
107 mixer_vols[n].num = -1;
109 for (i = 0; i < 32; i++)
110 mixer_vols[n].levels[i] = levels[i];
111 return mixer_vols[n].levels;
113 EXPORT_SYMBOL(load_mixer_volumes);
115 static int set_mixer_levels(void __user * arg)
117 /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
120 if (__copy_from_user(&buf, arg, sizeof(buf)))
122 load_mixer_volumes(buf.name, buf.levels, 0);
123 if (__copy_to_user(arg, &buf, sizeof(buf)))
128 static int get_mixer_levels(void __user * arg)
132 if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
134 if (n < 0 || n >= num_mixer_volumes)
136 if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
141 /* 4K page size but our output routines use some slack for overruns */
142 #define PROC_BLOCK_SIZE (3*1024)
144 static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
146 int dev = iminor(file_inode(file));
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..
155 mutex_lock(&soundcard_mutex);
157 switch (dev & 0x0f) {
161 ret = audio_read(dev, file, buf, count);
166 ret = sequencer_read(dev, file, buf, count);
170 ret = MIDIbuf_read(dev, file, buf, count);
172 mutex_unlock(&soundcard_mutex);
176 static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
178 int dev = iminor(file_inode(file));
181 mutex_lock(&soundcard_mutex);
182 switch (dev & 0x0f) {
185 ret = sequencer_write(dev, file, buf, count);
191 ret = audio_write(dev, file, buf, count);
195 ret = MIDIbuf_write(dev, file, buf, count);
198 mutex_unlock(&soundcard_mutex);
202 static int sound_open(struct inode *inode, struct file *file)
204 int dev = iminor(inode);
207 if ((dev >= SND_NDEVS) || (dev < 0)) {
208 printk(KERN_ERR "Invalid minor device %d\n", dev);
211 mutex_lock(&soundcard_mutex);
212 switch (dev & 0x0f) {
215 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
216 request_module("mixer%d", dev);
219 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
222 if (!try_module_get(mixer_devs[dev]->owner))
230 retval = sequencer_open(dev, file);
234 retval = MIDIbuf_open(dev, file);
240 retval = audio_open(dev, file);
244 printk(KERN_ERR "Invalid minor device %d\n", dev);
248 mutex_unlock(&soundcard_mutex);
252 static int sound_release(struct inode *inode, struct file *file)
254 int dev = iminor(inode);
256 mutex_lock(&soundcard_mutex);
257 switch (dev & 0x0f) {
259 module_put(mixer_devs[dev >> 4]->owner);
264 sequencer_release(dev, file);
268 MIDIbuf_release(dev, file);
274 audio_release(dev, file);
278 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
280 mutex_unlock(&soundcard_mutex);
285 static int get_mixer_info(int dev, void __user *arg)
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)))
297 static int get_old_mixer_info(int dev, void __user *arg)
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)))
308 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
310 if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
312 /* Try to load the mixer... */
313 if (mixer_devs[mixdev] == NULL) {
314 request_module("mixer%d", mixdev);
316 if (mixdev >= num_mixers || !mixer_devs[mixdev])
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)
326 return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
329 static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
332 int dev = iminor(file_inode(file));
334 void __user *p = (void __user *)arg;
336 if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
338 * Have to validate the address given by the process.
340 len = _SIOC_SIZE(cmd);
341 if (len < 1 || len > 65536 || !p)
343 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
344 if (!access_ok(VERIFY_READ, p, len))
346 if (_SIOC_DIR(cmd) & _SIOC_READ)
347 if (!access_ok(VERIFY_WRITE, p, len))
350 if (cmd == OSS_GETVERSION)
351 return __put_user(SOUND_VERSION, (int __user *)p);
353 mutex_lock(&soundcard_mutex);
354 if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
355 (dev & 0x0f) != SND_DEV_CTL) {
361 ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
365 ret = sound_mixer_ioctl(dev >> 4, cmd, p);
368 mutex_unlock(&soundcard_mutex);
372 switch (dev & 0x0f) {
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);
379 ret = sound_mixer_ioctl(dev >> 4, cmd, p);
384 ret = sequencer_ioctl(dev, file, cmd, p);
390 ret = audio_ioctl(dev, file, cmd, p);
394 ret = MIDIbuf_ioctl(dev, file, cmd, p);
398 mutex_unlock(&soundcard_mutex);
402 static unsigned int sound_poll(struct file *file, poll_table * wait)
404 struct inode *inode = file_inode(file);
405 int dev = iminor(inode);
407 switch (dev & 0x0f) {
410 return sequencer_poll(dev, file, wait);
413 return MIDIbuf_poll(dev, file, wait);
418 return DMAbuf_poll(file, dev >> 4, wait);
423 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
427 struct dma_buffparms *dmap = NULL;
428 int dev = iminor(file_inode(file));
430 dev_class = dev & 0x0f;
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");
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;
443 printk(KERN_ERR "Sound: Undefined mmap() access\n");
444 mutex_unlock(&soundcard_mutex);
449 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
450 mutex_unlock(&soundcard_mutex);
453 if (dmap->raw_buf == NULL) {
454 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
455 mutex_unlock(&soundcard_mutex);
458 if (dmap->mapping_flags) {
459 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
460 mutex_unlock(&soundcard_mutex);
463 if (vma->vm_pgoff != 0) {
464 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
465 mutex_unlock(&soundcard_mutex);
468 size = vma->vm_end - vma->vm_start;
470 if (size != dmap->bytes_in_use) {
471 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
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);
480 dmap->mapping_flags |= DMA_MAP_MAPPED;
482 if( audio_devs[dev]->d->mmap)
483 audio_devs[dev]->d->mmap(dev);
485 memset(dmap->raw_buf,
488 mutex_unlock(&soundcard_mutex);
492 const struct file_operations oss_sound_fops = {
493 .owner = THIS_MODULE,
496 .write = sound_write,
498 .unlocked_ioctl = sound_ioctl,
501 .release = sound_release,
505 * Create the required special subdevices
508 static int create_special_devices(void)
511 seq1=register_sound_special(&oss_sound_fops, 1);
514 seq2=register_sound_special(&oss_sound_fops, 8);
517 unregister_sound_special(1);
526 module_param(dmabuf, int, 0444);
527 module_param(dmabug, int, 0444);
529 /* additional minors for compatibility */
530 struct oss_minor_dev {
531 unsigned short minor;
532 unsigned int enabled;
538 static int __init oss_init(void)
545 isa_dma_bridge_buggy = dmabug;
548 err = create_special_devices();
550 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
554 /* Protecting the innocent */
555 sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
557 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
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);
566 if (sound_nblocks >= MAX_MEM_BLOCKS - 1)
567 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
572 static void __exit oss_cleanup(void)
576 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
579 if (dev_list[i].enabled & (1 << j))
580 unregister_sound_special(dev_list[i].minor);
581 } while (++j < num_audiodevs);
584 unregister_sound_special(1);
585 unregister_sound_special(8);
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);
597 for (i = 0; i < sound_nblocks; i++)
598 vfree(sound_mem_blocks[i]);
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.");
609 int sound_alloc_dma(int chn, char *deviceID)
613 if ((err = request_dma(chn, deviceID)) != 0)
616 dma_alloc_map[chn] = DMA_MAP_FREE;
620 EXPORT_SYMBOL(sound_alloc_dma);
622 int sound_open_dma(int chn, char *deviceID)
624 if (!valid_dma(chn)) {
625 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
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]);
633 dma_alloc_map[chn] = DMA_MAP_BUSY;
636 EXPORT_SYMBOL(sound_open_dma);
638 void sound_free_dma(int chn)
640 if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
641 /* printk( "sound_free_dma: Bad access to DMA channel %d\n", chn); */
645 dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
647 EXPORT_SYMBOL(sound_free_dma);
649 void sound_close_dma(int chn)
651 if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
652 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
655 dma_alloc_map[chn] = DMA_MAP_FREE;
657 EXPORT_SYMBOL(sound_close_dma);
659 static void do_sequencer_timer(unsigned long dummy)
665 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
667 void request_sound_timer(int count)
669 extern unsigned long seq_time;
672 seq_timer.expires = (-count) + jiffies;
673 add_timer(&seq_timer);
683 seq_timer.expires = (count) + jiffies;
684 add_timer(&seq_timer);
687 void sound_stop_timer(void)
689 del_timer(&seq_timer);
692 void conf_printf(char *name, struct address_info *hw_config)
694 #ifndef CONFIG_SOUND_TRACEINIT
697 printk("<%s> at 0x%03x", name, hw_config->io_base);
700 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
702 if (hw_config->dma != -1 || hw_config->dma2 != -1)
704 printk(" dma %d", hw_config->dma);
705 if (hw_config->dma2 != -1)
706 printk(",%d", hw_config->dma2);
711 EXPORT_SYMBOL(conf_printf);
713 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
715 #ifndef CONFIG_SOUND_TRACEINIT
718 printk("<%s> at 0x%03x", name, base);
721 printk(" irq %d", (irq > 0) ? irq : -irq);
723 if (dma != -1 || dma2 != -1)
725 printk(" dma %d", dma);
732 EXPORT_SYMBOL(conf_printf2);