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/slab.h>
40 #include <linux/ioport.h>
41 #include <linux/major.h>
42 #include <linux/delay.h>
43 #include <linux/proc_fs.h>
44 #include <linux/smp_lock.h>
45 #include <linux/module.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[1024];
59 int sound_nblocks = 0;
61 /* Persistent DMA buffers */
62 #ifdef CONFIG_SOUND_DMAP
63 int sound_dmap_flag = 1;
65 int sound_dmap_flag = 0;
68 static char dma_alloc_map[MAX_DMA_CHANNELS];
70 #define DMA_MAP_UNAVAIL 0
71 #define DMA_MAP_FREE 1
72 #define DMA_MAP_BUSY 2
75 unsigned long seq_time = 0; /* Time for /dev/sequencer */
76 extern struct class *sound_class;
79 * Table for configurable mixer volume handling
81 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
82 static int num_mixer_volumes;
84 int *load_mixer_volumes(char *name, int *levels, int present)
88 for (i = 0; i < num_mixer_volumes; i++) {
89 if (strcmp(name, mixer_vols[i].name) == 0) {
91 mixer_vols[i].num = i;
92 return mixer_vols[i].levels;
95 if (num_mixer_volumes >= MAX_MIXER_DEV) {
96 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
99 n = num_mixer_volumes++;
101 strcpy(mixer_vols[n].name, name);
104 mixer_vols[n].num = n;
106 mixer_vols[n].num = -1;
108 for (i = 0; i < 32; i++)
109 mixer_vols[n].levels[i] = levels[i];
110 return mixer_vols[n].levels;
112 EXPORT_SYMBOL(load_mixer_volumes);
114 static int set_mixer_levels(void __user * arg)
116 /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
119 if (__copy_from_user(&buf, arg, sizeof(buf)))
121 load_mixer_volumes(buf.name, buf.levels, 0);
122 if (__copy_to_user(arg, &buf, sizeof(buf)))
127 static int get_mixer_levels(void __user * arg)
131 if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
133 if (n < 0 || n >= num_mixer_volumes)
135 if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
140 /* 4K page size but our output routines use some slack for overruns */
141 #define PROC_BLOCK_SIZE (3*1024)
143 static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
145 int dev = iminor(file->f_path.dentry->d_inode);
149 * The OSS drivers aren't remotely happy without this locking,
150 * and unless someone fixes them when they are about to bite the
151 * big one anyway, we might as well bandage here..
156 DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
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);
176 static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
178 int dev = iminor(file->f_path.dentry->d_inode);
182 DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
183 switch (dev & 0x0f) {
186 ret = sequencer_write(dev, file, buf, count);
192 ret = audio_write(dev, file, buf, count);
196 ret = MIDIbuf_write(dev, file, buf, count);
203 static int sound_open(struct inode *inode, struct file *file)
205 int dev = iminor(inode);
208 DEB(printk("sound_open(dev=%d)\n", dev));
209 if ((dev >= SND_NDEVS) || (dev < 0)) {
210 printk(KERN_ERR "Invalid minor device %d\n", dev);
213 switch (dev & 0x0f) {
216 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
217 request_module("mixer%d", dev);
219 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
222 if (!try_module_get(mixer_devs[dev]->owner))
228 if ((retval = sequencer_open(dev, file)) < 0)
233 if ((retval = MIDIbuf_open(dev, file)) < 0)
240 if ((retval = audio_open(dev, file)) < 0)
245 printk(KERN_ERR "Invalid minor device %d\n", dev);
252 static int sound_release(struct inode *inode, struct file *file)
254 int dev = iminor(inode);
257 DEB(printk("sound_release(dev=%d)\n", dev));
258 switch (dev & 0x0f) {
260 module_put(mixer_devs[dev >> 4]->owner);
265 sequencer_release(dev, file);
269 MIDIbuf_release(dev, file);
275 audio_release(dev, file);
279 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
286 static int get_mixer_info(int dev, void __user *arg)
289 memset(&info, 0, sizeof(info));
290 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
291 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
292 info.modify_counter = mixer_devs[dev]->modify_counter;
293 if (__copy_to_user(arg, &info, sizeof(info)))
298 static int get_old_mixer_info(int dev, void __user *arg)
300 _old_mixer_info info;
301 memset(&info, 0, sizeof(info));
302 strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
303 strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
304 if (copy_to_user(arg, &info, sizeof(info)))
309 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
311 if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
313 /* Try to load the mixer... */
314 if (mixer_devs[mixdev] == NULL) {
315 request_module("mixer%d", mixdev);
317 if (mixdev >= num_mixers || !mixer_devs[mixdev])
319 if (cmd == SOUND_MIXER_INFO)
320 return get_mixer_info(mixdev, arg);
321 if (cmd == SOUND_OLD_MIXER_INFO)
322 return get_old_mixer_info(mixdev, arg);
323 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
324 mixer_devs[mixdev]->modify_counter++;
325 if (!mixer_devs[mixdev]->ioctl)
327 return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
330 static int sound_ioctl(struct inode *inode, struct file *file,
331 unsigned int cmd, unsigned long arg)
334 int dev = iminor(inode);
335 void __user *p = (void __user *)arg;
337 if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
339 * Have to validate the address given by the process.
341 len = _SIOC_SIZE(cmd);
342 if (len < 1 || len > 65536 || !p)
344 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
345 if (!access_ok(VERIFY_READ, p, len))
347 if (_SIOC_DIR(cmd) & _SIOC_READ)
348 if (!access_ok(VERIFY_WRITE, p, len))
351 DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
352 if (cmd == OSS_GETVERSION)
353 return __put_user(SOUND_VERSION, (int __user *)p);
355 if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
356 (dev & 0x0f) != SND_DEV_CTL) {
362 return sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
366 return sound_mixer_ioctl(dev >> 4, cmd, p);
369 switch (dev & 0x0f) {
371 if (cmd == SOUND_MIXER_GETLEVELS)
372 return get_mixer_levels(p);
373 if (cmd == SOUND_MIXER_SETLEVELS)
374 return set_mixer_levels(p);
375 return sound_mixer_ioctl(dev >> 4, cmd, p);
379 return sequencer_ioctl(dev, file, cmd, p);
384 return audio_ioctl(dev, file, cmd, p);
388 return MIDIbuf_ioctl(dev, file, cmd, p);
395 static unsigned int sound_poll(struct file *file, poll_table * wait)
397 struct inode *inode = file->f_path.dentry->d_inode;
398 int dev = iminor(inode);
400 DEB(printk("sound_poll(dev=%d)\n", dev));
401 switch (dev & 0x0f) {
404 return sequencer_poll(dev, file, wait);
407 return MIDIbuf_poll(dev, file, wait);
412 return DMAbuf_poll(file, dev >> 4, wait);
417 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
421 struct dma_buffparms *dmap = NULL;
422 int dev = iminor(file->f_path.dentry->d_inode);
424 dev_class = dev & 0x0f;
427 if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
428 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
432 if (vma->vm_flags & VM_WRITE) /* Map write and read/write to the output buf */
433 dmap = audio_devs[dev]->dmap_out;
434 else if (vma->vm_flags & VM_READ)
435 dmap = audio_devs[dev]->dmap_in;
437 printk(KERN_ERR "Sound: Undefined mmap() access\n");
443 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
447 if (dmap->raw_buf == NULL) {
448 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
452 if (dmap->mapping_flags) {
453 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
457 if (vma->vm_pgoff != 0) {
458 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
462 size = vma->vm_end - vma->vm_start;
464 if (size != dmap->bytes_in_use) {
465 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
467 if (remap_pfn_range(vma, vma->vm_start,
468 virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
469 vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
474 dmap->mapping_flags |= DMA_MAP_MAPPED;
476 if( audio_devs[dev]->d->mmap)
477 audio_devs[dev]->d->mmap(dev);
479 memset(dmap->raw_buf,
486 const struct file_operations oss_sound_fops = {
487 .owner = THIS_MODULE,
490 .write = sound_write,
492 .ioctl = sound_ioctl,
495 .release = sound_release,
499 * Create the required special subdevices
502 static int create_special_devices(void)
505 seq1=register_sound_special(&oss_sound_fops, 1);
508 seq2=register_sound_special(&oss_sound_fops, 8);
511 unregister_sound_special(1);
517 /* These device names follow the official Linux device list,
518 * Documentation/devices.txt. Let us know if there are other
519 * common names we should support for compatibility.
520 * Only those devices not created by the generic code in sound_core.c are
523 static const struct {
524 unsigned short minor;
528 } dev_list[] = { /* list of minor devices */
529 /* seems to be some confusion here -- this device is not in the device list */
530 {SND_DEV_DSP16, "dspW", S_IWUGO | S_IRUSR | S_IRGRP,
532 {SND_DEV_AUDIO, "audio", S_IWUGO | S_IRUSR | S_IRGRP,
539 module_param(dmabuf, int, 0444);
540 module_param(dmabug, int, 0444);
542 static int __init oss_init(void)
549 isa_dma_bridge_buggy = dmabug;
552 err = create_special_devices();
554 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
558 /* Protecting the innocent */
559 sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
561 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
562 device_create(sound_class, NULL,
563 MKDEV(SOUND_MAJOR, dev_list[i].minor),
564 "%s", dev_list[i].name);
566 if (!dev_list[i].num)
569 for (j = 1; j < *dev_list[i].num; j++)
570 device_create(sound_class, NULL,
571 MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)),
572 "%s%d", dev_list[i].name, j);
575 if (sound_nblocks >= 1024)
576 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
581 static void __exit oss_cleanup(void)
585 for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
586 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
587 if (!dev_list[i].num)
589 for (j = 1; j < *dev_list[i].num; j++)
590 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
593 unregister_sound_special(1);
594 unregister_sound_special(8);
600 for (i = 0; i < MAX_DMA_CHANNELS; i++)
601 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
602 printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
606 for (i = 0; i < sound_nblocks; i++)
607 vfree(sound_mem_blocks[i]);
611 module_init(oss_init);
612 module_exit(oss_cleanup);
613 MODULE_LICENSE("GPL");
614 MODULE_DESCRIPTION("OSS Sound subsystem");
615 MODULE_AUTHOR("Hannu Savolainen, et al.");
618 int sound_alloc_dma(int chn, char *deviceID)
622 if ((err = request_dma(chn, deviceID)) != 0)
625 dma_alloc_map[chn] = DMA_MAP_FREE;
629 EXPORT_SYMBOL(sound_alloc_dma);
631 int sound_open_dma(int chn, char *deviceID)
633 if (!valid_dma(chn)) {
634 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
638 if (dma_alloc_map[chn] != DMA_MAP_FREE) {
639 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
642 dma_alloc_map[chn] = DMA_MAP_BUSY;
645 EXPORT_SYMBOL(sound_open_dma);
647 void sound_free_dma(int chn)
649 if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
650 /* printk( "sound_free_dma: Bad access to DMA channel %d\n", chn); */
654 dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
656 EXPORT_SYMBOL(sound_free_dma);
658 void sound_close_dma(int chn)
660 if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
661 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
664 dma_alloc_map[chn] = DMA_MAP_FREE;
666 EXPORT_SYMBOL(sound_close_dma);
668 static void do_sequencer_timer(unsigned long dummy)
674 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
676 void request_sound_timer(int count)
678 extern unsigned long seq_time;
681 seq_timer.expires = (-count) + jiffies;
682 add_timer(&seq_timer);
692 seq_timer.expires = (count) + jiffies;
693 add_timer(&seq_timer);
696 void sound_stop_timer(void)
698 del_timer(&seq_timer);
701 void conf_printf(char *name, struct address_info *hw_config)
703 #ifndef CONFIG_SOUND_TRACEINIT
706 printk("<%s> at 0x%03x", name, hw_config->io_base);
709 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
711 if (hw_config->dma != -1 || hw_config->dma2 != -1)
713 printk(" dma %d", hw_config->dma);
714 if (hw_config->dma2 != -1)
715 printk(",%d", hw_config->dma2);
720 EXPORT_SYMBOL(conf_printf);
722 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
724 #ifndef CONFIG_SOUND_TRACEINIT
727 printk("<%s> at 0x%03x", name, base);
730 printk(" irq %d", (irq > 0) ? irq : -irq);
732 if (dma != -1 || dma2 != -1)
734 printk(" dma %d", dma);
741 EXPORT_SYMBOL(conf_printf2);