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![Takashi Iwai](/assets/img/avatar_default.png)
Since OSS driver creates the device entries for /dev/audio* and /dev/dspW* by itself without coping with sound_core, it leads to conflicts with others and let sysfs spewing warnings. This patch rewrites the registration part of OSS driver to use the standard method also for additional minor devices. Reported-by: Steven Rostedt <rostedt@goodmis.org> (with ktest.pl) Tested-by: Steven Rostedt <rostedt@goodmis.org> (with ktest.pl) Signed-off-by: Takashi Iwai <tiwai@suse.de>
739 lines
17 KiB
C
739 lines
17 KiB
C
/*
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* linux/sound/oss/soundcard.c
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*
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* Sound card driver for Linux
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*
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*
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* Copyright (C) by Hannu Savolainen 1993-1997
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*
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* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
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* Version 2 (June 1991). See the "COPYING" file distributed with this software
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* for more info.
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*
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*
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* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
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* integrated sound_switch.c
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* Stefan Reinauer : integrated /proc/sound (equals to /dev/sndstat,
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* which should disappear in the near future)
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* Eric Dumas : devfs support (22-Jan-98) <dumas@linux.eu.org> with
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* fixups by C. Scott Ananian <cananian@alumni.princeton.edu>
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* Richard Gooch : moved common (non OSS-specific) devices to sound_core.c
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* Rob Riggs : Added persistent DMA buffers support (1998/10/17)
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* Christoph Hellwig : Some cleanup work (2000/03/01)
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*/
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#include "sound_config.h"
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/fcntl.h>
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#include <linux/ctype.h>
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#include <linux/stddef.h>
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#include <linux/kmod.h>
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#include <linux/kernel.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <linux/wait.h>
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#include <linux/ioport.h>
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#include <linux/major.h>
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#include <linux/delay.h>
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#include <linux/proc_fs.h>
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#include <linux/mutex.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/device.h>
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/*
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* This ought to be moved into include/asm/dma.h
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*/
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#ifndef valid_dma
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#define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
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#endif
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/*
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* Table for permanently allocated memory (used when unloading the module)
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*/
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void * sound_mem_blocks[MAX_MEM_BLOCKS];
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static DEFINE_MUTEX(soundcard_mutex);
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int sound_nblocks = 0;
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/* Persistent DMA buffers */
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#ifdef CONFIG_SOUND_DMAP
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int sound_dmap_flag = 1;
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#else
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int sound_dmap_flag = 0;
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#endif
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static char dma_alloc_map[MAX_DMA_CHANNELS];
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#define DMA_MAP_UNAVAIL 0
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#define DMA_MAP_FREE 1
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#define DMA_MAP_BUSY 2
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unsigned long seq_time = 0; /* Time for /dev/sequencer */
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extern struct class *sound_class;
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/*
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* Table for configurable mixer volume handling
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*/
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static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
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static int num_mixer_volumes;
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int *load_mixer_volumes(char *name, int *levels, int present)
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{
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int i, n;
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for (i = 0; i < num_mixer_volumes; i++) {
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if (strncmp(name, mixer_vols[i].name, 32) == 0) {
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if (present)
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mixer_vols[i].num = i;
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return mixer_vols[i].levels;
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}
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}
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if (num_mixer_volumes >= MAX_MIXER_DEV) {
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printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
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return levels;
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}
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n = num_mixer_volumes++;
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strncpy(mixer_vols[n].name, name, 32);
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if (present)
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mixer_vols[n].num = n;
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else
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mixer_vols[n].num = -1;
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for (i = 0; i < 32; i++)
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mixer_vols[n].levels[i] = levels[i];
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return mixer_vols[n].levels;
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}
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EXPORT_SYMBOL(load_mixer_volumes);
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static int set_mixer_levels(void __user * arg)
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{
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/* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
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mixer_vol_table buf;
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if (__copy_from_user(&buf, arg, sizeof(buf)))
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return -EFAULT;
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load_mixer_volumes(buf.name, buf.levels, 0);
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if (__copy_to_user(arg, &buf, sizeof(buf)))
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return -EFAULT;
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return 0;
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}
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static int get_mixer_levels(void __user * arg)
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{
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int n;
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if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
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return -EFAULT;
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if (n < 0 || n >= num_mixer_volumes)
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return -EINVAL;
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if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
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return -EFAULT;
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return 0;
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}
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/* 4K page size but our output routines use some slack for overruns */
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#define PROC_BLOCK_SIZE (3*1024)
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static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
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{
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int dev = iminor(file->f_path.dentry->d_inode);
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int ret = -EINVAL;
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/*
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* The OSS drivers aren't remotely happy without this locking,
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* and unless someone fixes them when they are about to bite the
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* big one anyway, we might as well bandage here..
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*/
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mutex_lock(&soundcard_mutex);
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DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
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switch (dev & 0x0f) {
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case SND_DEV_DSP:
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case SND_DEV_DSP16:
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case SND_DEV_AUDIO:
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ret = audio_read(dev, file, buf, count);
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break;
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case SND_DEV_SEQ:
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case SND_DEV_SEQ2:
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ret = sequencer_read(dev, file, buf, count);
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break;
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case SND_DEV_MIDIN:
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ret = MIDIbuf_read(dev, file, buf, count);
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}
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mutex_unlock(&soundcard_mutex);
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return ret;
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}
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static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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{
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int dev = iminor(file->f_path.dentry->d_inode);
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int ret = -EINVAL;
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mutex_lock(&soundcard_mutex);
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DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
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switch (dev & 0x0f) {
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case SND_DEV_SEQ:
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case SND_DEV_SEQ2:
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ret = sequencer_write(dev, file, buf, count);
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break;
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case SND_DEV_DSP:
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case SND_DEV_DSP16:
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case SND_DEV_AUDIO:
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ret = audio_write(dev, file, buf, count);
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break;
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case SND_DEV_MIDIN:
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ret = MIDIbuf_write(dev, file, buf, count);
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break;
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}
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mutex_unlock(&soundcard_mutex);
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return ret;
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}
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static int sound_open(struct inode *inode, struct file *file)
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{
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int dev = iminor(inode);
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int retval;
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DEB(printk("sound_open(dev=%d)\n", dev));
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if ((dev >= SND_NDEVS) || (dev < 0)) {
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printk(KERN_ERR "Invalid minor device %d\n", dev);
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return -ENXIO;
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}
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mutex_lock(&soundcard_mutex);
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switch (dev & 0x0f) {
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case SND_DEV_CTL:
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dev >>= 4;
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if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
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request_module("mixer%d", dev);
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}
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retval = -ENXIO;
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if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
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break;
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if (!try_module_get(mixer_devs[dev]->owner))
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break;
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retval = 0;
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break;
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case SND_DEV_SEQ:
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case SND_DEV_SEQ2:
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retval = sequencer_open(dev, file);
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break;
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case SND_DEV_MIDIN:
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retval = MIDIbuf_open(dev, file);
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break;
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case SND_DEV_DSP:
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case SND_DEV_DSP16:
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case SND_DEV_AUDIO:
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retval = audio_open(dev, file);
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break;
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default:
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printk(KERN_ERR "Invalid minor device %d\n", dev);
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retval = -ENXIO;
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}
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mutex_unlock(&soundcard_mutex);
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return retval;
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}
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static int sound_release(struct inode *inode, struct file *file)
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{
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int dev = iminor(inode);
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mutex_lock(&soundcard_mutex);
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DEB(printk("sound_release(dev=%d)\n", dev));
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switch (dev & 0x0f) {
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case SND_DEV_CTL:
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module_put(mixer_devs[dev >> 4]->owner);
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break;
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case SND_DEV_SEQ:
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case SND_DEV_SEQ2:
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sequencer_release(dev, file);
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break;
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case SND_DEV_MIDIN:
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MIDIbuf_release(dev, file);
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break;
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case SND_DEV_DSP:
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case SND_DEV_DSP16:
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case SND_DEV_AUDIO:
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audio_release(dev, file);
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break;
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default:
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printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
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}
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mutex_unlock(&soundcard_mutex);
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return 0;
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}
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static int get_mixer_info(int dev, void __user *arg)
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{
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mixer_info info;
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memset(&info, 0, sizeof(info));
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strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
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strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
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info.modify_counter = mixer_devs[dev]->modify_counter;
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if (__copy_to_user(arg, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int get_old_mixer_info(int dev, void __user *arg)
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{
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_old_mixer_info info;
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memset(&info, 0, sizeof(info));
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strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
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strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
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if (copy_to_user(arg, &info, sizeof(info)))
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return -EFAULT;
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return 0;
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}
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static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
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{
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if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
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return -ENXIO;
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/* Try to load the mixer... */
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if (mixer_devs[mixdev] == NULL) {
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request_module("mixer%d", mixdev);
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}
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if (mixdev >= num_mixers || !mixer_devs[mixdev])
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return -ENXIO;
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if (cmd == SOUND_MIXER_INFO)
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return get_mixer_info(mixdev, arg);
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if (cmd == SOUND_OLD_MIXER_INFO)
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return get_old_mixer_info(mixdev, arg);
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if (_SIOC_DIR(cmd) & _SIOC_WRITE)
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mixer_devs[mixdev]->modify_counter++;
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if (!mixer_devs[mixdev]->ioctl)
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return -EINVAL;
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return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
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}
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static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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int len = 0, dtype;
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int dev = iminor(file->f_dentry->d_inode);
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long ret = -EINVAL;
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void __user *p = (void __user *)arg;
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if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
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/*
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* Have to validate the address given by the process.
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*/
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len = _SIOC_SIZE(cmd);
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if (len < 1 || len > 65536 || !p)
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return -EFAULT;
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if (_SIOC_DIR(cmd) & _SIOC_WRITE)
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if (!access_ok(VERIFY_READ, p, len))
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return -EFAULT;
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if (_SIOC_DIR(cmd) & _SIOC_READ)
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if (!access_ok(VERIFY_WRITE, p, len))
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return -EFAULT;
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}
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DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
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if (cmd == OSS_GETVERSION)
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return __put_user(SOUND_VERSION, (int __user *)p);
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mutex_lock(&soundcard_mutex);
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if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 && /* Mixer ioctl */
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(dev & 0x0f) != SND_DEV_CTL) {
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dtype = dev & 0x0f;
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switch (dtype) {
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case SND_DEV_DSP:
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case SND_DEV_DSP16:
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case SND_DEV_AUDIO:
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ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
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cmd, p);
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break;
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default:
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ret = sound_mixer_ioctl(dev >> 4, cmd, p);
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break;
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}
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mutex_unlock(&soundcard_mutex);
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return ret;
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}
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switch (dev & 0x0f) {
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case SND_DEV_CTL:
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if (cmd == SOUND_MIXER_GETLEVELS)
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ret = get_mixer_levels(p);
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else if (cmd == SOUND_MIXER_SETLEVELS)
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ret = set_mixer_levels(p);
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else
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ret = sound_mixer_ioctl(dev >> 4, cmd, p);
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break;
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case SND_DEV_SEQ:
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case SND_DEV_SEQ2:
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ret = sequencer_ioctl(dev, file, cmd, p);
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break;
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case SND_DEV_DSP:
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case SND_DEV_DSP16:
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case SND_DEV_AUDIO:
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ret = audio_ioctl(dev, file, cmd, p);
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break;
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case SND_DEV_MIDIN:
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ret = MIDIbuf_ioctl(dev, file, cmd, p);
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break;
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}
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mutex_unlock(&soundcard_mutex);
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return ret;
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}
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static unsigned int sound_poll(struct file *file, poll_table * wait)
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{
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struct inode *inode = file->f_path.dentry->d_inode;
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int dev = iminor(inode);
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DEB(printk("sound_poll(dev=%d)\n", dev));
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switch (dev & 0x0f) {
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case SND_DEV_SEQ:
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case SND_DEV_SEQ2:
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return sequencer_poll(dev, file, wait);
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case SND_DEV_MIDIN:
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return MIDIbuf_poll(dev, file, wait);
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case SND_DEV_DSP:
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case SND_DEV_DSP16:
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case SND_DEV_AUDIO:
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return DMAbuf_poll(file, dev >> 4, wait);
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}
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return 0;
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}
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static int sound_mmap(struct file *file, struct vm_area_struct *vma)
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{
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int dev_class;
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unsigned long size;
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struct dma_buffparms *dmap = NULL;
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int dev = iminor(file->f_path.dentry->d_inode);
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dev_class = dev & 0x0f;
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dev >>= 4;
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if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
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printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
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return -EINVAL;
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}
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mutex_lock(&soundcard_mutex);
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if (vma->vm_flags & VM_WRITE) /* Map write and read/write to the output buf */
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dmap = audio_devs[dev]->dmap_out;
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else if (vma->vm_flags & VM_READ)
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dmap = audio_devs[dev]->dmap_in;
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else {
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printk(KERN_ERR "Sound: Undefined mmap() access\n");
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mutex_unlock(&soundcard_mutex);
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return -EINVAL;
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}
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if (dmap == NULL) {
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printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
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mutex_unlock(&soundcard_mutex);
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return -EIO;
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}
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if (dmap->raw_buf == NULL) {
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printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
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mutex_unlock(&soundcard_mutex);
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return -EIO;
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}
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if (dmap->mapping_flags) {
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printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
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mutex_unlock(&soundcard_mutex);
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return -EIO;
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}
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if (vma->vm_pgoff != 0) {
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printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
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mutex_unlock(&soundcard_mutex);
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return -EINVAL;
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}
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size = vma->vm_end - vma->vm_start;
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|
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if (size != dmap->bytes_in_use) {
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printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
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}
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if (remap_pfn_range(vma, vma->vm_start,
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virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
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vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
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mutex_unlock(&soundcard_mutex);
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return -EAGAIN;
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}
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|
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dmap->mapping_flags |= DMA_MAP_MAPPED;
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|
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if( audio_devs[dev]->d->mmap)
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audio_devs[dev]->d->mmap(dev);
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|
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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);
|
|
|