- 根目录:
- sound
- oss
- soundcard.c
/*
* linux/sound/oss/soundcard.c
*
* Sound card driver for Linux
*
*
* Copyright (C) by Hannu Savolainen 1993-1997
*
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this software
* for more info.
*
*
* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
* integrated sound_switch.c
* Stefan Reinauer : integrated /proc/sound (equals to /dev/sndstat,
* which should disappear in the near future)
* Eric Dumas : devfs support (22-Jan-98) <dumas@linux.eu.org> with
* fixups by C. Scott Ananian <cananian@alumni.princeton.edu>
* Richard Gooch : moved common (non OSS-specific) devices to sound_core.c
* Rob Riggs : Added persistent DMA buffers support (1998/10/17)
* Christoph Hellwig : Some cleanup work (2000/03/01)
*/
#include "sound_config.h"
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/fcntl.h>
#include <linux/ctype.h>
#include <linux/stddef.h>
#include <linux/kmod.h>
#include <linux/kernel.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <linux/wait.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/device.h>
/*
* This ought to be moved into include/asm/dma.h
*/
#ifndef valid_dma
#define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
#endif
/*
* Table for permanently allocated memory (used when unloading the module)
*/
void * sound_mem_blocks[MAX_MEM_BLOCKS];
static DEFINE_MUTEX(soundcard_mutex);
int sound_nblocks = 0;
/* Persistent DMA buffers */
#ifdef CONFIG_SOUND_DMAP
int sound_dmap_flag = 1;
#else
int sound_dmap_flag = 0;
#endif
static char dma_alloc_map[MAX_DMA_CHANNELS];
#define DMA_MAP_UNAVAIL 0
#define DMA_MAP_FREE 1
#define DMA_MAP_BUSY 2
unsigned long seq_time = 0; /* Time for /dev/sequencer */
extern struct class *sound_class;
/*
* Table for configurable mixer volume handling
*/
static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
static int num_mixer_volumes;
int *load_mixer_volumes(char *name, int *levels, int present)
{
int i, n;
for (i = 0; i < num_mixer_volumes; i++) {
if (strncmp(name, mixer_vols[i].name, 32) == 0) {
if (present)
mixer_vols[i].num = i;
return mixer_vols[i].levels;
}
}
if (num_mixer_volumes >= MAX_MIXER_DEV) {
printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
return levels;
}
n = num_mixer_volumes++;
strncpy(mixer_vols[n].name, name, 32);
if (present)
mixer_vols[n].num = n;
else
mixer_vols[n].num = -1;
for (i = 0; i < 32; i++)
mixer_vols[n].levels[i] = levels[i];
return mixer_vols[n].levels;
}
EXPORT_SYMBOL(load_mixer_volumes);
static int set_mixer_levels(void __user * arg)
{
/* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
mixer_vol_table buf;
if (__copy_from_user(&buf, arg, sizeof(buf)))
return -EFAULT;
load_mixer_volumes(buf.name, buf.levels, 0);
if (__copy_to_user(arg, &buf, sizeof(buf)))
return -EFAULT;
return 0;
}
static int get_mixer_levels(void __user * arg)
{
int n;
if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
return -EFAULT;
if (n < 0 || n >= num_mixer_volumes)
return -EINVAL;
if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
return -EFAULT;
return 0;
}
/* 4K page size but our output routines use some slack for overruns */
#define PROC_BLOCK_SIZE (3*1024)
static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
int dev = iminor(file_inode(file));
int ret = -EINVAL;
/*
* The OSS drivers aren't remotely happy without this locking,
* and unless someone fixes them when they are about to bite the
* big one anyway, we might as well bandage here..
*/
mutex_lock(&soundcard_mutex);
switch (dev & 0x0f) {
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
ret = audio_read(dev, file, buf, count);
break;
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
ret = sequencer_read(dev, file, buf, count);
break;
case SND_DEV_MIDIN:
ret = MIDIbuf_read(dev, file, buf, count);
}
mutex_unlock(&soundcard_mutex);
return ret;
}
static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
int dev = iminor(file_inode(file));
int ret = -EINVAL;
mutex_lock(&soundcard_mutex);
switch (dev & 0x0f) {
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
ret = sequencer_write(dev, file, buf, count);
break;
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
ret = audio_write(dev, file, buf, count);
break;
case SND_DEV_MIDIN:
ret = MIDIbuf_write(dev, file, buf, count);
break;
}
mutex_unlock(&soundcard_mutex);
return ret;
}
static int sound_open(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
int retval;
if ((dev >= SND_NDEVS) || (dev < 0)) {
printk(KERN_ERR "Invalid minor device %d\n", dev);
return -ENXIO;
}
mutex_lock(&soundcard_mutex);
switch (dev & 0x0f) {
case SND_DEV_CTL:
dev >>= 4;
if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
request_module("mixer%d", dev);
}
retval = -ENXIO;
if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
break;
if (!try_module_get(mixer_devs[dev]->owner))
break;
retval = 0;
break;
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
retval = sequencer_open(dev, file);
break;
case SND_DEV_MIDIN:
retval = MIDIbuf_open(dev, file);
break;
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
retval = audio_open(dev, file);
break;
default:
printk(KERN_ERR "Invalid minor device %d\n", dev);
retval = -ENXIO;
}
mutex_unlock(&soundcard_mutex);
return retval;
}
static int sound_release(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
mutex_lock(&soundcard_mutex);
switch (dev & 0x0f) {
case SND_DEV_CTL:
module_put(mixer_devs[dev >> 4]->owner);
break;
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
sequencer_release(dev, file);
break;
case SND_DEV_MIDIN:
MIDIbuf_release(dev, file);
break;
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
audio_release(dev, file);
break;
default:
printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
}
mutex_unlock(&soundcard_mutex);
return 0;
}
static int get_mixer_info(int dev, void __user *arg)
{
mixer_info info;
memset(&info, 0, sizeof(info));
strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
info.modify_counter = mixer_devs[dev]->modify_counter;
if (__copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int get_old_mixer_info(int dev, void __user *arg)
{
_old_mixer_info info;
memset(&info, 0, sizeof(info));
strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
{
if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
return -ENXIO;
/* Try to load the mixer... */
if (mixer_devs[mixdev] == NULL) {
request_module("mixer%d", mixdev);
}
if (mixdev >= num_mixers || !mixer_devs[mixdev])
return -ENXIO;
if (cmd == SOUND_MIXER_INFO)
return get_mixer_info(mixdev, arg);
if (cmd == SOUND_OLD_MIXER_INFO)
return get_old_mixer_info(mixdev, arg);
if (_SIOC_DIR(cmd) & _SIOC_WRITE)
mixer_devs[mixdev]->modify_counter++;
if (!mixer_devs[mixdev]->ioctl)
return -EINVAL;
return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
}
static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int len = 0, dtype;
int dev = iminor(file_inode(file));
long ret = -EINVAL;
void __user *p = (void __user *)arg;
if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
/*
* Have to validate the address given by the process.
*/
len = _SIOC_SIZE(cmd);
if (len < 1 || len > 65536 || !p)
return -EFAULT;
if (_SIOC_DIR(cmd) & _SIOC_WRITE)
if (!access_ok(VERIFY_READ, p, len))
return -EFAULT;
if (_SIOC_DIR(cmd) & _SIOC_READ)
if (!access_ok(VERIFY_WRITE, p, len))
return -EFAULT;
}
if (cmd == OSS_GETVERSION)
return __put_user(SOUND_VERSION, (int __user *)p);
mutex_lock(&soundcard_mutex);
if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
(dev & 0x0f) != SND_DEV_CTL) {
dtype = dev & 0x0f;
switch (dtype) {
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
cmd, p);
break;
default:
ret = sound_mixer_ioctl(dev >> 4, cmd, p);
break;
}
mutex_unlock(&soundcard_mutex);
return ret;
}
switch (dev & 0x0f) {
case SND_DEV_CTL:
if (cmd == SOUND_MIXER_GETLEVELS)
ret = get_mixer_levels(p);
else if (cmd == SOUND_MIXER_SETLEVELS)
ret = set_mixer_levels(p);
else
ret = sound_mixer_ioctl(dev >> 4, cmd, p);
break;
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
ret = sequencer_ioctl(dev, file, cmd, p);
break;
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
ret = audio_ioctl(dev, file, cmd, p);
break;
case SND_DEV_MIDIN:
ret = MIDIbuf_ioctl(dev, file, cmd, p);
break;
}
mutex_unlock(&soundcard_mutex);
return ret;
}
static unsigned int sound_poll(struct file *file, poll_table * wait)
{
struct inode *inode = file_inode(file);
int dev = iminor(inode);
switch (dev & 0x0f) {
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
return sequencer_poll(dev, file, wait);
case SND_DEV_MIDIN:
return MIDIbuf_poll(dev, file, wait);
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
return DMAbuf_poll(file, dev >> 4, wait);
}
return 0;
}
static int sound_mmap(struct file *file, struct vm_area_struct *vma)
{
int dev_class;
unsigned long size;
struct dma_buffparms *dmap = NULL;
int dev = iminor(file_inode(file));
dev_class = dev & 0x0f;
dev >>= 4;
if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
return -EINVAL;
}
mutex_lock(&soundcard_mutex);
if (vma->vm_flags & VM_WRITE) /* Map write and read/write to the output buf */
dmap = audio_devs[dev]->dmap_out;
else if (vma->vm_flags & VM_READ)
dmap = audio_devs[dev]->dmap_in;
else {
printk(KERN_ERR "Sound: Undefined mmap() access\n");
mutex_unlock(&soundcard_mutex);
return -EINVAL;
}
if (dmap == NULL) {
printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
mutex_unlock(&soundcard_mutex);
return -EIO;
}
if (dmap->raw_buf == NULL) {
printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
mutex_unlock(&soundcard_mutex);
return -EIO;
}
if (dmap->mapping_flags) {
printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
mutex_unlock(&soundcard_mutex);
return -EIO;
}
if (vma->vm_pgoff != 0) {
printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
mutex_unlock(&soundcard_mutex);
return -EINVAL;
}
size = vma->vm_end - vma->vm_start;
if (size != dmap->bytes_in_use) {
printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
}
if (remap_pfn_range(vma, vma->vm_start,
virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
mutex_unlock(&soundcard_mutex);
return -EAGAIN;
}
dmap->mapping_flags |= DMA_MAP_MAPPED;
if( audio_devs[dev]->d->mmap)
audio_devs[dev]->d->mmap(dev);
memset(dmap->raw_buf,
dmap->neutral_byte,
dmap->bytes_in_use);
mutex_unlock(&soundcard_mutex);
return 0;
}
const struct file_operations oss_sound_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = sound_read,
.write = sound_write,
.poll = sound_poll,
.unlocked_ioctl = sound_ioctl,
.mmap = sound_mmap,
.open = sound_open,
.release = sound_release,
};
/*
* Create the required special subdevices
*/
static int create_special_devices(void)
{
int seq1,seq2;
seq1=register_sound_special(&oss_sound_fops, 1);
if(seq1==-1)
goto bad;
seq2=register_sound_special(&oss_sound_fops, 8);
if(seq2!=-1)
return 0;
unregister_sound_special(1);
bad:
return -1;
}
static int dmabuf;
static int dmabug;
module_param(dmabuf, int, 0444);
module_param(dmabug, int, 0444);
/* additional minors for compatibility */
struct oss_minor_dev {
unsigned short minor;
unsigned int enabled;
} dev_list[] = {
{ SND_DEV_DSP16 },
{ SND_DEV_AUDIO },
};
static int __init oss_init(void)
{
int err;
int i, j;
#ifdef CONFIG_PCI
if(dmabug)
isa_dma_bridge_buggy = dmabug;
#endif
err = create_special_devices();
if (err) {
printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
return err;
}
/* Protecting the innocent */
sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
j = 0;
do {
unsigned short minor = dev_list[i].minor + j * 0x10;
if (!register_sound_special(&oss_sound_fops, minor))
dev_list[i].enabled = (1 << j);
} while (++j < num_audiodevs);
}
if (sound_nblocks >= MAX_MEM_BLOCKS - 1)
printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
return 0;
}
static void __exit oss_cleanup(void)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
j = 0;
do {
if (dev_list[i].enabled & (1 << j))
unregister_sound_special(dev_list[i].minor);
} while (++j < num_audiodevs);
}
unregister_sound_special(1);
unregister_sound_special(8);
sound_stop_timer();
sequencer_unload();
for (i = 0; i < MAX_DMA_CHANNELS; i++)
if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
sound_free_dma(i);
}
for (i = 0; i < sound_nblocks; i++)
vfree(sound_mem_blocks[i]);
}
module_init(oss_init);
module_exit(oss_cleanup);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("OSS Sound subsystem");
MODULE_AUTHOR("Hannu Savolainen, et al.");
int sound_alloc_dma(int chn, char *deviceID)
{
int err;
if ((err = request_dma(chn, deviceID)) != 0)
return err;
dma_alloc_map[chn] = DMA_MAP_FREE;
return 0;
}
EXPORT_SYMBOL(sound_alloc_dma);
int sound_open_dma(int chn, char *deviceID)
{
if (!valid_dma(chn)) {
printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
return 1;
}
if (dma_alloc_map[chn] != DMA_MAP_FREE) {
printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
return 1;
}
dma_alloc_map[chn] = DMA_MAP_BUSY;
return 0;
}
EXPORT_SYMBOL(sound_open_dma);
void sound_free_dma(int chn)
{
if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
/* printk( "sound_free_dma: Bad access to DMA channel %d\n", chn); */
return;
}
free_dma(chn);
dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
}
EXPORT_SYMBOL(sound_free_dma);
void sound_close_dma(int chn)
{
if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
return;
}
dma_alloc_map[chn] = DMA_MAP_FREE;
}
EXPORT_SYMBOL(sound_close_dma);
static void do_sequencer_timer(unsigned long dummy)
{
sequencer_timer(0);
}
static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
void request_sound_timer(int count)
{
extern unsigned long seq_time;
if (count < 0) {
seq_timer.expires = (-count) + jiffies;
add_timer(&seq_timer);
return;
}
count += seq_time;
count -= jiffies;
if (count < 1)
count = 1;
seq_timer.expires = (count) + jiffies;
add_timer(&seq_timer);
}
void sound_stop_timer(void)
{
del_timer(&seq_timer);
}
void conf_printf(char *name, struct address_info *hw_config)
{
#ifndef CONFIG_SOUND_TRACEINIT
return;
#else
printk("<%s> at 0x%03x", name, hw_config->io_base);
if (hw_config->irq)
printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
if (hw_config->dma != -1 || hw_config->dma2 != -1)
{
printk(" dma %d", hw_config->dma);
if (hw_config->dma2 != -1)
printk(",%d", hw_config->dma2);
}
printk("\n");
#endif
}
EXPORT_SYMBOL(conf_printf);
void conf_printf2(char *name, int base, int irq, int dma, int dma2)
{
#ifndef CONFIG_SOUND_TRACEINIT
return;
#else
printk("<%s> at 0x%03x", name, base);
if (irq)
printk(" irq %d", (irq > 0) ? irq : -irq);
if (dma != -1 || dma2 != -1)
{
printk(" dma %d", dma);
if (dma2 != -1)
printk(",%d", dma2);
}
printk("\n");
#endif
}
EXPORT_SYMBOL(conf_printf2);