--- /dev/null
+/*
+ * 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);
+
Code Review / kvmfornfv.git / blobdiff