android_kernel_xiaomi_sm8350/sound/oss/soundcard.c
Arjan van de Ven 9c2e08c592 [PATCH] mark struct file_operations const 9
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:46 -08:00

743 lines
17 KiB
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/slab.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/smp_lock.h>
#include <linux/module.h>
#include <linux/mm.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[1024];
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 (strcmp(name, mixer_vols[i].name) == 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++;
strcpy(mixer_vols[n].name, name);
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->f_path.dentry->d_inode);
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..
*/
lock_kernel();
DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
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);
}
unlock_kernel();
return ret;
}
static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
int dev = iminor(file->f_path.dentry->d_inode);
int ret = -EINVAL;
lock_kernel();
DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
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;
}
unlock_kernel();
return ret;
}
static int sound_open(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
int retval;
DEB(printk("sound_open(dev=%d)\n", dev));
if ((dev >= SND_NDEVS) || (dev < 0)) {
printk(KERN_ERR "Invalid minor device %d\n", dev);
return -ENXIO;
}
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);
}
if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
return -ENXIO;
if (!try_module_get(mixer_devs[dev]->owner))
return -ENXIO;
break;
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
if ((retval = sequencer_open(dev, file)) < 0)
return retval;
break;
case SND_DEV_MIDIN:
if ((retval = MIDIbuf_open(dev, file)) < 0)
return retval;
break;
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
if ((retval = audio_open(dev, file)) < 0)
return retval;
break;
default:
printk(KERN_ERR "Invalid minor device %d\n", dev);
return -ENXIO;
}
return 0;
}
static int sound_release(struct inode *inode, struct file *file)
{
int dev = iminor(inode);
lock_kernel();
DEB(printk("sound_release(dev=%d)\n", dev));
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);
}
unlock_kernel();
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 int sound_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int len = 0, dtype;
int dev = iminor(inode);
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;
}
DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
if (cmd == OSS_GETVERSION)
return __put_user(SOUND_VERSION, (int __user *)p);
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:
return sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
cmd, p);
default:
return sound_mixer_ioctl(dev >> 4, cmd, p);
}
}
switch (dev & 0x0f) {
case SND_DEV_CTL:
if (cmd == SOUND_MIXER_GETLEVELS)
return get_mixer_levels(p);
if (cmd == SOUND_MIXER_SETLEVELS)
return set_mixer_levels(p);
return sound_mixer_ioctl(dev >> 4, cmd, p);
case SND_DEV_SEQ:
case SND_DEV_SEQ2:
return sequencer_ioctl(dev, file, cmd, p);
case SND_DEV_DSP:
case SND_DEV_DSP16:
case SND_DEV_AUDIO:
return audio_ioctl(dev, file, cmd, p);
break;
case SND_DEV_MIDIN:
return MIDIbuf_ioctl(dev, file, cmd, p);
break;
}
return -EINVAL;
}
static unsigned int sound_poll(struct file *file, poll_table * wait)
{
struct inode *inode = file->f_path.dentry->d_inode;
int dev = iminor(inode);
DEB(printk("sound_poll(dev=%d)\n", dev));
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->f_path.dentry->d_inode);
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;
}
lock_kernel();
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");
unlock_kernel();
return -EINVAL;
}
if (dmap == NULL) {
printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
unlock_kernel();
return -EIO;
}
if (dmap->raw_buf == NULL) {
printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
unlock_kernel();
return -EIO;
}
if (dmap->mapping_flags) {
printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
unlock_kernel();
return -EIO;
}
if (vma->vm_pgoff != 0) {
printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
unlock_kernel();
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)) {
unlock_kernel();
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);
unlock_kernel();
return 0;
}
const struct file_operations oss_sound_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = sound_read,
.write = sound_write,
.poll = sound_poll,
.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;
}
/* These device names follow the official Linux device list,
* Documentation/devices.txt. Let us know if there are other
* common names we should support for compatibility.
* Only those devices not created by the generic code in sound_core.c are
* registered here.
*/
static const struct {
unsigned short minor;
char *name;
umode_t mode;
int *num;
} dev_list[] = { /* list of minor devices */
/* seems to be some confusion here -- this device is not in the device list */
{SND_DEV_DSP16, "dspW", S_IWUGO | S_IRUSR | S_IRGRP,
&num_audiodevs},
{SND_DEV_AUDIO, "audio", S_IWUGO | S_IRUSR | S_IRGRP,
&num_audiodevs},
};
static int dmabuf;
static int dmabug;
module_param(dmabuf, int, 0444);
module_param(dmabug, int, 0444);
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++) {
device_create(sound_class, NULL,
MKDEV(SOUND_MAJOR, dev_list[i].minor),
"%s", dev_list[i].name);
if (!dev_list[i].num)
continue;
for (j = 1; j < *dev_list[i].num; j++)
device_create(sound_class, NULL,
MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)),
"%s%d", dev_list[i].name, j);
}
if (sound_nblocks >= 1024)
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++) {
device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
if (!dev_list[i].num)
continue;
for (j = 1; j < *dev_list[i].num; j++)
device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
}
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);