Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1298 insertions, 0 deletions

diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
new file mode 100644
index 000000000000..baf4244a54f2
--- /dev/null
+++ b/sound/oss/dmabuf.c
@@ -0,0 +1,1298 @@
+/*
+ * sound/dmabuf.c
+ *
+ * The DMA buffer manager for digitized voice applications
+ */
+/*
+ * 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   : moved several static variables into struct audio_operations
+ *                   (which is grossly misnamed btw.) because they have the same
+ *                   lifetime as the rest in there and dynamic allocation saves
+ *                   12k or so
+ * Thomas Sailer   : remove {in,out}_sleep_flag. It was used for the sleeper to
+ *                   determine if it was woken up by the expiring timeout or by
+ *                   an explicit wake_up. The return value from schedule_timeout
+ *                   can be used instead; if 0, the wakeup was due to the timeout.
+ *
+ * Rob Riggs            Added persistent DMA buffers (1998/10/17)
+ */
+
+#define BE_CONSERVATIVE
+#define SAMPLE_ROUNDUP 0
+
+#include "sound_config.h"
+
+#define DMAP_FREE_ON_CLOSE      0
+#define DMAP_KEEP_ON_CLOSE      1
+extern int sound_dmap_flag;
+
+static void dma_reset_output(int dev);
+static void dma_reset_input(int dev);
+static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode);
+
+
+
+static int debugmem;            /* switched off by default */
+static int dma_buffsize = DSP_BUFFSIZE;
+
+static long dmabuf_timeout(struct dma_buffparms *dmap)
+{
+        long tmout;
+
+        tmout = (dmap->fragment_size * HZ) / dmap->data_rate;
+        tmout += HZ / 5;        /* Some safety distance */
+        if (tmout < (HZ / 2))
+                tmout = HZ / 2;
+        if (tmout > 20 * HZ)
+                tmout = 20 * HZ;
+        return tmout;
+}
+
+static int sound_alloc_dmap(struct dma_buffparms *dmap)
+{
+        char *start_addr, *end_addr;
+        int dma_pagesize;
+        int sz, size;
+        struct page *page;
+
+        dmap->mapping_flags &= ~DMA_MAP_MAPPED;
+
+        if (dmap->raw_buf != NULL)
+                return 0;       /* Already done */
+        if (dma_buffsize < 4096)
+                dma_buffsize = 4096;
+        dma_pagesize = (dmap->dma < 4) ? (64 * 1024) : (128 * 1024);
+        
+        /*
+         *      Now check for the Cyrix problem.
+         */
+         
+        if(isa_dma_bridge_buggy==2)
+                dma_pagesize=32768;
+         
+        dmap->raw_buf = NULL;
+        dmap->buffsize = dma_buffsize;
+        if (dmap->buffsize > dma_pagesize)
+                dmap->buffsize = dma_pagesize;
+        start_addr = NULL;
+        /*
+         * Now loop until we get a free buffer. Try to get smaller buffer if
+         * it fails. Don't accept smaller than 8k buffer for performance
+         * reasons.
+         */
+        while (start_addr == NULL && dmap->buffsize > PAGE_SIZE) {
+                for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
+                dmap->buffsize = PAGE_SIZE * (1 << sz);
+                start_addr = (char *) __get_free_pages(GFP_ATOMIC|GFP_DMA|__GFP_NOWARN, sz);
+                if (start_addr == NULL)
+                        dmap->buffsize /= 2;
+        }
+
+        if (start_addr == NULL) {
+                printk(KERN_WARNING "Sound error: Couldn't allocate DMA buffer\n");
+                return -ENOMEM;
+        } else {
+                /* make some checks */
+                end_addr = start_addr + dmap->buffsize - 1;
+
+                if (debugmem)
+                        printk(KERN_DEBUG "sound: start 0x%lx, end 0x%lx\n", (long) start_addr, (long) end_addr);
+                
+                /* now check if it fits into the same dma-pagesize */
+
+                if (((long) start_addr & ~(dma_pagesize - 1)) != ((long) end_addr & ~(dma_pagesize - 1))
+                    || end_addr >= (char *) (MAX_DMA_ADDRESS)) {
+                        printk(KERN_ERR "sound: Got invalid address 0x%lx for %db DMA-buffer\n", (long) start_addr, dmap->buffsize);
+                        return -EFAULT;
+                }
+        }
+        dmap->raw_buf = start_addr;
+        dmap->raw_buf_phys = virt_to_bus(start_addr);
+
+        for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
+                SetPageReserved(page);
+        return 0;
+}
+
+static void sound_free_dmap(struct dma_buffparms *dmap)
+{
+        int sz, size;
+        struct page *page;
+        unsigned long start_addr, end_addr;
+
+        if (dmap->raw_buf == NULL)
+                return;
+        if (dmap->mapping_flags & DMA_MAP_MAPPED)
+                return;         /* Don't free mmapped buffer. Will use it next time */
+        for (sz = 0, size = PAGE_SIZE; size < dmap->buffsize; sz++, size <<= 1);
+
+        start_addr = (unsigned long) dmap->raw_buf;
+        end_addr = start_addr + dmap->buffsize;
+
+        for (page = virt_to_page(start_addr); page <= virt_to_page(end_addr); page++)
+                ClearPageReserved(page);
+
+        free_pages((unsigned long) dmap->raw_buf, sz);
+        dmap->raw_buf = NULL;
+}
+
+
+/* Intel version !!!!!!!!! */
+
+static int sound_start_dma(struct dma_buffparms *dmap, unsigned long physaddr, int count, int dma_mode)
+{
+        unsigned long flags;
+        int chan = dmap->dma;
+
+        /* printk( "Start DMA%d %d, %d\n",  chan,  (int)(physaddr-dmap->raw_buf_phys),  count); */
+
+        flags = claim_dma_lock();
+        disable_dma(chan);
+        clear_dma_ff(chan);
+        set_dma_mode(chan, dma_mode);
+        set_dma_addr(chan, physaddr);
+        set_dma_count(chan, count);
+        enable_dma(chan);
+        release_dma_lock(flags);
+
+        return 0;
+}
+
+static void dma_init_buffers(struct dma_buffparms *dmap)
+{
+        dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
+        dmap->byte_counter = 0;
+        dmap->max_byte_counter = 8000 * 60 * 60;
+        dmap->bytes_in_use = dmap->buffsize;
+
+        dmap->dma_mode = DMODE_NONE;
+        dmap->mapping_flags = 0;
+        dmap->neutral_byte = 0x80;
+        dmap->data_rate = 8000;
+        dmap->cfrag = -1;
+        dmap->closing = 0;
+        dmap->nbufs = 1;
+        dmap->flags = DMA_BUSY; /* Other flags off */
+}
+
+static int open_dmap(struct audio_operations *adev, int mode, struct dma_buffparms *dmap)
+{
+        int err;
+        
+        if (dmap->flags & DMA_BUSY)
+                return -EBUSY;
+        if ((err = sound_alloc_dmap(dmap)) < 0)
+                return err;
+
+        if (dmap->raw_buf == NULL) {
+                printk(KERN_WARNING "Sound: DMA buffers not available\n");
+                return -ENOSPC; /* Memory allocation failed during boot */
+        }
+        if (dmap->dma >= 0 && sound_open_dma(dmap->dma, adev->name)) {
+                printk(KERN_WARNING "Unable to grab(2) DMA%d for the audio driver\n", dmap->dma);
+                return -EBUSY;
+        }
+        dma_init_buffers(dmap);
+        spin_lock_init(&dmap->lock);
+        dmap->open_mode = mode;
+        dmap->subdivision = dmap->underrun_count = 0;
+        dmap->fragment_size = 0;
+        dmap->max_fragments = 65536;    /* Just a large value */
+        dmap->byte_counter = 0;
+        dmap->max_byte_counter = 8000 * 60 * 60;
+        dmap->applic_profile = APF_NORMAL;
+        dmap->needs_reorg = 1;
+        dmap->audio_callback = NULL;
+        dmap->callback_parm = 0;
+        return 0;
+}
+
+static void close_dmap(struct audio_operations *adev, struct dma_buffparms *dmap)
+{
+        unsigned long flags;
+        
+        if (dmap->dma >= 0) {
+                sound_close_dma(dmap->dma);
+                flags=claim_dma_lock();
+                disable_dma(dmap->dma);
+                release_dma_lock(flags);
+        }
+        if (dmap->flags & DMA_BUSY)
+                dmap->dma_mode = DMODE_NONE;
+        dmap->flags &= ~DMA_BUSY;
+        
+        if (sound_dmap_flag == DMAP_FREE_ON_CLOSE)
+                sound_free_dmap(dmap);
+}
+
+
+static unsigned int default_set_bits(int dev, unsigned int bits)
+{
+        mm_segment_t fs = get_fs();
+
+        set_fs(get_ds());
+        audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SETFMT, (void __user *)&bits);
+        set_fs(fs);
+        return bits;
+}
+
+static int default_set_speed(int dev, int speed)
+{
+        mm_segment_t fs = get_fs();
+
+        set_fs(get_ds());
+        audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_SPEED, (void __user *)&speed);
+        set_fs(fs);
+        return speed;
+}
+
+static short default_set_channels(int dev, short channels)
+{
+        int c = channels;
+        mm_segment_t fs = get_fs();
+
+        set_fs(get_ds());
+        audio_devs[dev]->d->ioctl(dev, SNDCTL_DSP_CHANNELS, (void __user *)&c);
+        set_fs(fs);
+        return c;
+}
+
+static void check_driver(struct audio_driver *d)
+{
+        if (d->set_speed == NULL)
+                d->set_speed = default_set_speed;
+        if (d->set_bits == NULL)
+                d->set_bits = default_set_bits;
+        if (d->set_channels == NULL)
+                d->set_channels = default_set_channels;
+}
+
+int DMAbuf_open(int dev, int mode)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        int retval;
+        struct dma_buffparms *dmap_in = NULL;
+        struct dma_buffparms *dmap_out = NULL;
+
+        if (!adev)
+                  return -ENXIO;
+        if (!(adev->flags & DMA_DUPLEX))
+                adev->dmap_in = adev->dmap_out;
+        check_driver(adev->d);
+
+        if ((retval = adev->d->open(dev, mode)) < 0)
+                return retval;
+        dmap_out = adev->dmap_out;
+        dmap_in = adev->dmap_in;
+        if (dmap_in == dmap_out)
+                adev->flags &= ~DMA_DUPLEX;
+
+        if (mode & OPEN_WRITE) {
+                if ((retval = open_dmap(adev, mode, dmap_out)) < 0) {
+                        adev->d->close(dev);
+                        return retval;
+                }
+        }
+        adev->enable_bits = mode;
+
+        if (mode == OPEN_READ || (mode != OPEN_WRITE && (adev->flags & DMA_DUPLEX))) {
+                if ((retval = open_dmap(adev, mode, dmap_in)) < 0) {
+                        adev->d->close(dev);
+                        if (mode & OPEN_WRITE)
+                                close_dmap(adev, dmap_out);
+                        return retval;
+                }
+        }
+        adev->open_mode = mode;
+        adev->go = 1;
+
+        adev->d->set_bits(dev, 8);
+        adev->d->set_channels(dev, 1);
+        adev->d->set_speed(dev, DSP_DEFAULT_SPEED);
+        if (adev->dmap_out->dma_mode == DMODE_OUTPUT) 
+                memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
+                       adev->dmap_out->bytes_in_use);
+        return 0;
+}
+/* MUST not hold the spinlock */
+void DMAbuf_reset(int dev)
+{
+        if (audio_devs[dev]->open_mode & OPEN_WRITE)
+                dma_reset_output(dev);
+
+        if (audio_devs[dev]->open_mode & OPEN_READ)
+                dma_reset_input(dev);
+}
+
+static void dma_reset_output(int dev)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        unsigned long flags,f ;
+        struct dma_buffparms *dmap = adev->dmap_out;
+
+        if (!(dmap->flags & DMA_STARTED))       /* DMA is not active */
+                return;
+
+        /*
+         *      First wait until the current fragment has been played completely
+         */
+        spin_lock_irqsave(&dmap->lock,flags);
+        adev->dmap_out->flags |= DMA_SYNCING;
+
+        adev->dmap_out->underrun_count = 0;
+        if (!signal_pending(current) && adev->dmap_out->qlen && 
+            adev->dmap_out->underrun_count == 0){
+                spin_unlock_irqrestore(&dmap->lock,flags);
+                interruptible_sleep_on_timeout(&adev->out_sleeper,
+                                               dmabuf_timeout(dmap));
+                spin_lock_irqsave(&dmap->lock,flags);
+        }
+        adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
+
+        /*
+         *      Finally shut the device off
+         */
+        if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_output)
+                adev->d->halt_io(dev);
+        else
+                adev->d->halt_output(dev);
+        adev->dmap_out->flags &= ~DMA_STARTED;
+        
+        f=claim_dma_lock();
+        clear_dma_ff(dmap->dma);
+        disable_dma(dmap->dma);
+        release_dma_lock(f);
+        
+        dmap->byte_counter = 0;
+        reorganize_buffers(dev, adev->dmap_out, 0);
+        dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
+        spin_unlock_irqrestore(&dmap->lock,flags);
+}
+
+static void dma_reset_input(int dev)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        unsigned long flags;
+        struct dma_buffparms *dmap = adev->dmap_in;
+
+        spin_lock_irqsave(&dmap->lock,flags);
+        if (!(adev->flags & DMA_DUPLEX) || !adev->d->halt_input)
+                adev->d->halt_io(dev);
+        else
+                adev->d->halt_input(dev);
+        adev->dmap_in->flags &= ~DMA_STARTED;
+
+        dmap->qlen = dmap->qhead = dmap->qtail = dmap->user_counter = 0;
+        dmap->byte_counter = 0;
+        reorganize_buffers(dev, adev->dmap_in, 1);
+        spin_unlock_irqrestore(&dmap->lock,flags);
+}
+/* MUST be called with holding the dmap->lock */
+void DMAbuf_launch_output(int dev, struct dma_buffparms *dmap)
+{
+        struct audio_operations *adev = audio_devs[dev];
+
+        if (!((adev->enable_bits * adev->go) & PCM_ENABLE_OUTPUT))
+                return;         /* Don't start DMA yet */
+        dmap->dma_mode = DMODE_OUTPUT;
+
+        if (!(dmap->flags & DMA_ACTIVE) || !(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
+                if (!(dmap->flags & DMA_STARTED)) {
+                        reorganize_buffers(dev, dmap, 0);
+                        if (adev->d->prepare_for_output(dev, dmap->fragment_size, dmap->nbufs))
+                                return;
+                        if (!(dmap->flags & DMA_NODMA))
+                                local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_WRITE);
+                        dmap->flags |= DMA_STARTED;
+                }
+                if (dmap->counts[dmap->qhead] == 0)
+                        dmap->counts[dmap->qhead] = dmap->fragment_size;
+                dmap->dma_mode = DMODE_OUTPUT;
+                adev->d->output_block(dev, dmap->raw_buf_phys + dmap->qhead * dmap->fragment_size,
+                                      dmap->counts[dmap->qhead], 1);
+                if (adev->d->trigger)
+                        adev->d->trigger(dev,adev->enable_bits * adev->go);
+        }
+        dmap->flags |= DMA_ACTIVE;
+}
+
+int DMAbuf_sync(int dev)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        unsigned long flags;
+        int n = 0;
+        struct dma_buffparms *dmap;
+
+        if (!adev->go && !(adev->enable_bits & PCM_ENABLE_OUTPUT))
+                return 0;
+
+        if (adev->dmap_out->dma_mode == DMODE_OUTPUT) {
+                dmap = adev->dmap_out;
+                spin_lock_irqsave(&dmap->lock,flags);
+                if (dmap->qlen > 0 && !(dmap->flags & DMA_ACTIVE))
+                        DMAbuf_launch_output(dev, dmap);
+                adev->dmap_out->flags |= DMA_SYNCING;
+                adev->dmap_out->underrun_count = 0;
+                while (!signal_pending(current) && n++ <= adev->dmap_out->nbufs && 
+                       adev->dmap_out->qlen && adev->dmap_out->underrun_count == 0) {
+                        long t = dmabuf_timeout(dmap);
+                        spin_unlock_irqrestore(&dmap->lock,flags);
+                        /* FIXME: not safe may miss events */
+                        t = interruptible_sleep_on_timeout(&adev->out_sleeper, t);
+                        spin_lock_irqsave(&dmap->lock,flags);
+                        if (!t) {
+                                adev->dmap_out->flags &= ~DMA_SYNCING;
+                                spin_unlock_irqrestore(&dmap->lock,flags);
+                                return adev->dmap_out->qlen;
+                        }
+                }
+                adev->dmap_out->flags &= ~(DMA_SYNCING | DMA_ACTIVE);
+                
+                /*
+                 * Some devices such as GUS have huge amount of on board RAM for the
+                 * audio data. We have to wait until the device has finished playing.
+                 */
+
+                /* still holding the lock */
+                if (adev->d->local_qlen) {   /* Device has hidden buffers */
+                        while (!signal_pending(current) &&
+                               adev->d->local_qlen(dev)){
+                                spin_unlock_irqrestore(&dmap->lock,flags);
+                                interruptible_sleep_on_timeout(&adev->out_sleeper,
+                                                               dmabuf_timeout(dmap));
+                                spin_lock_irqsave(&dmap->lock,flags);
+                        }
+                }
+                spin_unlock_irqrestore(&dmap->lock,flags);
+        }
+        adev->dmap_out->dma_mode = DMODE_NONE;
+        return adev->dmap_out->qlen;
+}
+
+int DMAbuf_release(int dev, int mode)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap;
+        unsigned long flags;
+
+        dmap = adev->dmap_out;
+        if (adev->open_mode & OPEN_WRITE)
+                adev->dmap_out->closing = 1;
+
+        if (adev->open_mode & OPEN_READ){
+                adev->dmap_in->closing = 1;
+                dmap = adev->dmap_in;
+        }
+        if (adev->open_mode & OPEN_WRITE)
+                if (!(adev->dmap_out->mapping_flags & DMA_MAP_MAPPED))
+                        if (!signal_pending(current) && (adev->dmap_out->dma_mode == DMODE_OUTPUT))
+                                DMAbuf_sync(dev);
+        if (adev->dmap_out->dma_mode == DMODE_OUTPUT)
+                memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte, adev->dmap_out->bytes_in_use);
+
+        DMAbuf_reset(dev);
+        spin_lock_irqsave(&dmap->lock,flags);
+        adev->d->close(dev);
+
+        if (adev->open_mode & OPEN_WRITE)
+                close_dmap(adev, adev->dmap_out);
+
+        if (adev->open_mode == OPEN_READ ||
+            (adev->open_mode != OPEN_WRITE &&
+             (adev->flags & DMA_DUPLEX)))
+                close_dmap(adev, adev->dmap_in);
+        adev->open_mode = 0;
+        spin_unlock_irqrestore(&dmap->lock,flags);
+        return 0;
+}
+/* called with dmap->lock dold */
+int DMAbuf_activate_recording(int dev, struct dma_buffparms *dmap)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        int  err;
+
+        if (!(adev->open_mode & OPEN_READ))
+                return 0;
+        if (!(adev->enable_bits & PCM_ENABLE_INPUT))
+                return 0;
+        if (dmap->dma_mode == DMODE_OUTPUT) {   /* Direction change */
+                /* release lock - it's not recursive */
+                spin_unlock_irq(&dmap->lock);
+                DMAbuf_sync(dev);
+                DMAbuf_reset(dev);
+                spin_lock_irq(&dmap->lock);
+                dmap->dma_mode = DMODE_NONE;
+        }
+        if (!dmap->dma_mode) {
+                reorganize_buffers(dev, dmap, 1);
+                if ((err = adev->d->prepare_for_input(dev,
+                                dmap->fragment_size, dmap->nbufs)) < 0)
+                        return err;
+                dmap->dma_mode = DMODE_INPUT;
+        }
+        if (!(dmap->flags & DMA_ACTIVE)) {
+                if (dmap->needs_reorg)
+                        reorganize_buffers(dev, dmap, 0);
+                local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
+                adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
+                                     dmap->fragment_size, 0);
+                dmap->flags |= DMA_ACTIVE;
+                if (adev->d->trigger)
+                        adev->d->trigger(dev, adev->enable_bits * adev->go);
+        }
+        return 0;
+}
+/* aquires lock */
+int DMAbuf_getrdbuffer(int dev, char **buf, int *len, int dontblock)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        unsigned long flags;
+        int err = 0, n = 0;
+        struct dma_buffparms *dmap = adev->dmap_in;
+        int go;
+
+        if (!(adev->open_mode & OPEN_READ))
+                return -EIO;
+        spin_lock_irqsave(&dmap->lock,flags);
+        if (dmap->needs_reorg)
+                reorganize_buffers(dev, dmap, 0);
+        if (adev->dmap_in->mapping_flags & DMA_MAP_MAPPED) {
+/*                printk(KERN_WARNING "Sound: Can't read from mmapped device (1)\n");*/
+                  spin_unlock_irqrestore(&dmap->lock,flags);
+                  return -EINVAL;
+        } else while (dmap->qlen <= 0 && n++ < 10) {
+                long timeout = MAX_SCHEDULE_TIMEOUT;
+                if (!(adev->enable_bits & PCM_ENABLE_INPUT) || !adev->go) {
+                        spin_unlock_irqrestore(&dmap->lock,flags);
+                        return -EAGAIN;
+                }
+                if ((err = DMAbuf_activate_recording(dev, dmap)) < 0) {
+                        spin_unlock_irqrestore(&dmap->lock,flags);
+                        return err;
+                }
+                /* Wait for the next block */
+
+                if (dontblock) {
+                        spin_unlock_irqrestore(&dmap->lock,flags);
+                        return -EAGAIN;
+                }
+                if ((go = adev->go))
+                        timeout = dmabuf_timeout(dmap);
+
+                spin_unlock_irqrestore(&dmap->lock,flags);
+                timeout = interruptible_sleep_on_timeout(&adev->in_sleeper,
+                                                         timeout);
+                if (!timeout) {
+                        /* FIXME: include device name */
+                        err = -EIO;
+                        printk(KERN_WARNING "Sound: DMA (input) timed out - IRQ/DRQ config error?\n");
+                        dma_reset_input(dev);
+                } else
+                        err = -EINTR;
+                spin_lock_irqsave(&dmap->lock,flags);
+        }
+        spin_unlock_irqrestore(&dmap->lock,flags);
+
+        if (dmap->qlen <= 0)
+                return err ? err : -EINTR;
+        *buf = &dmap->raw_buf[dmap->qhead * dmap->fragment_size + dmap->counts[dmap->qhead]];
+        *len = dmap->fragment_size - dmap->counts[dmap->qhead];
+
+        return dmap->qhead;
+}
+
+int DMAbuf_rmchars(int dev, int buff_no, int c)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_in;
+        int p = dmap->counts[dmap->qhead] + c;
+
+        if (dmap->mapping_flags & DMA_MAP_MAPPED)
+        {
+/*                printk("Sound: Can't read from mmapped device (2)\n");*/
+                return -EINVAL;
+        }
+        else if (dmap->qlen <= 0)
+                return -EIO;
+        else if (p >= dmap->fragment_size) {  /* This buffer is completely empty */
+                dmap->counts[dmap->qhead] = 0;
+                dmap->qlen--;
+                dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
+        }
+        else dmap->counts[dmap->qhead] = p;
+
+        return 0;
+}
+/* MUST be called with dmap->lock hold */
+int DMAbuf_get_buffer_pointer(int dev, struct dma_buffparms *dmap, int direction)
+{
+        /*
+         *      Try to approximate the active byte position of the DMA pointer within the
+         *      buffer area as well as possible.
+         */
+
+        int pos;
+        unsigned long f;
+
+        if (!(dmap->flags & DMA_ACTIVE))
+                pos = 0;
+        else {
+                int chan = dmap->dma;
+                
+                f=claim_dma_lock();
+                clear_dma_ff(chan);
+                
+                if(!isa_dma_bridge_buggy)
+                        disable_dma(dmap->dma);
+                
+                pos = get_dma_residue(chan);
+                
+                pos = dmap->bytes_in_use - pos;
+
+                if (!(dmap->mapping_flags & DMA_MAP_MAPPED)) {
+                        if (direction == DMODE_OUTPUT) {
+                                if (dmap->qhead == 0)
+                                        if (pos > dmap->fragment_size)
+                                                pos = 0;
+                        } else {
+                                if (dmap->qtail == 0)
+                                        if (pos > dmap->fragment_size)
+                                                pos = 0;
+                        }
+                }
+                if (pos < 0)
+                        pos = 0;
+                if (pos >= dmap->bytes_in_use)
+                        pos = 0;
+                
+                if(!isa_dma_bridge_buggy)
+                        enable_dma(dmap->dma);
+                        
+                release_dma_lock(f);
+        }
+        /* printk( "%04x ",  pos); */
+
+        return pos;
+}
+
+/*
+ *      DMAbuf_start_devices() is called by the /dev/music driver to start
+ *      one or more audio devices at desired moment.
+ */
+
+void DMAbuf_start_devices(unsigned int devmask)
+{
+        struct audio_operations *adev;
+        int dev;
+
+        for (dev = 0; dev < num_audiodevs; dev++) {
+                if (!(devmask & (1 << dev)))
+                        continue;
+                if (!(adev = audio_devs[dev]))
+                        continue;
+                if (adev->open_mode == 0)
+                        continue;
+                if (adev->go)
+                        continue;
+                /* OK to start the device */
+                adev->go = 1;
+                if (adev->d->trigger)
+                        adev->d->trigger(dev,adev->enable_bits * adev->go);
+        }
+}
+/* via poll called without a lock ?*/
+int DMAbuf_space_in_queue(int dev)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        int len, max, tmp;
+        struct dma_buffparms *dmap = adev->dmap_out;
+        int lim = dmap->nbufs;
+
+        if (lim < 2)
+                lim = 2;
+
+        if (dmap->qlen >= lim)  /* No space at all */
+                return 0;
+
+        /*
+         *      Verify that there are no more pending buffers than the limit
+         *      defined by the process.
+         */
+
+        max = dmap->max_fragments;
+        if (max > lim)
+                max = lim;
+        len = dmap->qlen;
+
+        if (adev->d->local_qlen) {
+                tmp = adev->d->local_qlen(dev);
+                if (tmp && len)
+                        tmp--;  /* This buffer has been counted twice */
+                len += tmp;
+        }
+        if (dmap->byte_counter % dmap->fragment_size)   /* There is a partial fragment */
+                len = len + 1;
+
+        if (len >= max)
+                return 0;
+        return max - len;
+}
+/* MUST not hold the spinlock  - this function may sleep */
+static int output_sleep(int dev, int dontblock)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        int err = 0;
+        struct dma_buffparms *dmap = adev->dmap_out;
+        long timeout;
+        long timeout_value;
+
+        if (dontblock)
+                return -EAGAIN;
+        if (!(adev->enable_bits & PCM_ENABLE_OUTPUT))
+                return -EAGAIN;
+
+        /*
+         * Wait for free space
+         */
+        if (signal_pending(current))
+                return -EINTR;
+        timeout = (adev->go && !(dmap->flags & DMA_NOTIMEOUT));
+        if (timeout) 
+                timeout_value = dmabuf_timeout(dmap);
+        else
+                timeout_value = MAX_SCHEDULE_TIMEOUT;
+        timeout_value = interruptible_sleep_on_timeout(&adev->out_sleeper,
+                                                       timeout_value);
+        if (timeout != MAX_SCHEDULE_TIMEOUT && !timeout_value) {
+                printk(KERN_WARNING "Sound: DMA (output) timed out - IRQ/DRQ config error?\n");
+                dma_reset_output(dev);
+        } else {
+                if (signal_pending(current))
+                        err = -EINTR;
+        }
+        return err;
+}
+/* called with the lock held */
+static int find_output_space(int dev, char **buf, int *size)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_out;
+        unsigned long active_offs;
+        long len, offs;
+        int maxfrags;
+        int occupied_bytes = (dmap->user_counter % dmap->fragment_size);
+
+        *buf = dmap->raw_buf;
+        if (!(maxfrags = DMAbuf_space_in_queue(dev)) && !occupied_bytes)
+                return 0;
+
+#ifdef BE_CONSERVATIVE
+        active_offs = dmap->byte_counter + dmap->qhead * dmap->fragment_size;
+#else
+        active_offs = DMAbuf_get_buffer_pointer(dev, dmap, DMODE_OUTPUT);
+        /* Check for pointer wrapping situation */
+        if (active_offs < 0 || active_offs >= dmap->bytes_in_use)
+                active_offs = 0;
+        active_offs += dmap->byte_counter;
+#endif
+
+        offs = (dmap->user_counter % dmap->bytes_in_use) & ~SAMPLE_ROUNDUP;
+        if (offs < 0 || offs >= dmap->bytes_in_use) {
+                printk(KERN_ERR "Sound: Got unexpected offs %ld. Giving up.\n", offs);
+                printk("Counter = %ld, bytes=%d\n", dmap->user_counter, dmap->bytes_in_use);
+                return 0;
+        }
+        *buf = dmap->raw_buf + offs;
+
+        len = active_offs + dmap->bytes_in_use - dmap->user_counter;    /* Number of unused bytes in buffer */
+
+        if ((offs + len) > dmap->bytes_in_use)
+                len = dmap->bytes_in_use - offs;
+        if (len < 0) {
+                return 0;
+        }
+        if (len > ((maxfrags * dmap->fragment_size) - occupied_bytes))
+                len = (maxfrags * dmap->fragment_size) - occupied_bytes;
+        *size = len & ~SAMPLE_ROUNDUP;
+        return (*size > 0);
+}
+/* aquires lock  */
+int DMAbuf_getwrbuffer(int dev, char **buf, int *size, int dontblock)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        unsigned long flags;
+        int err = -EIO;
+        struct dma_buffparms *dmap = adev->dmap_out;
+
+        if (dmap->mapping_flags & DMA_MAP_MAPPED) {
+/*              printk(KERN_DEBUG "Sound: Can't write to mmapped device (3)\n");*/
+                return -EINVAL;
+        }
+        spin_lock_irqsave(&dmap->lock,flags);
+        if (dmap->needs_reorg)
+                reorganize_buffers(dev, dmap, 0);
+
+        if (dmap->dma_mode == DMODE_INPUT) {    /* Direction change */
+                spin_unlock_irqrestore(&dmap->lock,flags);
+                DMAbuf_reset(dev);
+                spin_lock_irqsave(&dmap->lock,flags);
+        }
+        dmap->dma_mode = DMODE_OUTPUT;
+
+        while (find_output_space(dev, buf, size) <= 0) {
+                spin_unlock_irqrestore(&dmap->lock,flags);
+                if ((err = output_sleep(dev, dontblock)) < 0) {
+                        return err;
+                }
+                spin_lock_irqsave(&dmap->lock,flags);
+        }
+
+        spin_unlock_irqrestore(&dmap->lock,flags);
+        return 0;
+}
+/* has to aquire dmap->lock */
+int DMAbuf_move_wrpointer(int dev, int l)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_out;
+        unsigned long ptr;
+        unsigned long end_ptr, p;
+        int post;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dmap->lock,flags);
+        post= (dmap->flags & DMA_POST);
+        ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
+
+        dmap->flags &= ~DMA_POST;
+        dmap->cfrag = -1;
+        dmap->user_counter += l;
+        dmap->flags |= DMA_DIRTY;
+
+        if (dmap->byte_counter >= dmap->max_byte_counter) {
+                /* Wrap the byte counters */
+                long decr = dmap->byte_counter;
+                dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
+                decr -= dmap->byte_counter;
+                dmap->user_counter -= decr;
+        }
+        end_ptr = (dmap->user_counter / dmap->fragment_size) * dmap->fragment_size;
+
+        p = (dmap->user_counter - 1) % dmap->bytes_in_use;
+        dmap->neutral_byte = dmap->raw_buf[p];
+
+        /* Update the fragment based bookkeeping too */
+        while (ptr < end_ptr) {
+                dmap->counts[dmap->qtail] = dmap->fragment_size;
+                dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
+                dmap->qlen++;
+                ptr += dmap->fragment_size;
+        }
+
+        dmap->counts[dmap->qtail] = dmap->user_counter - ptr;
+
+        /*
+         *      Let the low level driver perform some postprocessing to
+         *      the written data.
+         */
+        if (adev->d->postprocess_write)
+                adev->d->postprocess_write(dev);
+
+        if (!(dmap->flags & DMA_ACTIVE))
+                if (dmap->qlen > 1 || (dmap->qlen > 0 && (post || dmap->qlen >= dmap->nbufs - 1)))
+                        DMAbuf_launch_output(dev, dmap);
+
+        spin_unlock_irqrestore(&dmap->lock,flags);
+        return 0;
+}
+
+int DMAbuf_start_dma(int dev, unsigned long physaddr, int count, int dma_mode)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
+
+        if (dmap->raw_buf == NULL) {
+                printk(KERN_ERR "sound: DMA buffer(1) == NULL\n");
+                printk("Device %d, chn=%s\n", dev, (dmap == adev->dmap_out) ? "out" : "in");
+                return 0;
+        }
+        if (dmap->dma < 0)
+                return 0;
+        sound_start_dma(dmap, physaddr, count, dma_mode);
+        return count;
+}
+
+static int local_start_dma(struct audio_operations *adev, unsigned long physaddr, int count, int dma_mode)
+{
+        struct dma_buffparms *dmap = (dma_mode == DMA_MODE_WRITE) ? adev->dmap_out : adev->dmap_in;
+
+        if (dmap->raw_buf == NULL) {
+                printk(KERN_ERR "sound: DMA buffer(2) == NULL\n");
+                printk(KERN_ERR "Device %s, chn=%s\n", adev->name, (dmap == adev->dmap_out) ? "out" : "in");
+                return 0;
+        }
+        if (dmap->flags & DMA_NODMA)
+                return 1;
+        if (dmap->dma < 0)
+                return 0;
+        sound_start_dma(dmap, dmap->raw_buf_phys, dmap->bytes_in_use, dma_mode | DMA_AUTOINIT);
+        dmap->flags |= DMA_STARTED;
+        return count;
+}
+
+static void finish_output_interrupt(int dev, struct dma_buffparms *dmap)
+{
+        struct audio_operations *adev = audio_devs[dev];
+
+        if (dmap->audio_callback != NULL)
+                dmap->audio_callback(dev, dmap->callback_parm);
+        wake_up(&adev->out_sleeper);
+        wake_up(&adev->poll_sleeper);
+}
+/* called with dmap->lock held in irq context*/
+static void do_outputintr(int dev, int dummy)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_out;
+        int this_fragment;
+
+        if (dmap->raw_buf == NULL) {
+                printk(KERN_ERR "Sound: Error. Audio interrupt (%d) after freeing buffers.\n", dev);
+                return;
+        }
+        if (dmap->mapping_flags & DMA_MAP_MAPPED) {     /* Virtual memory mapped access */
+                /* mmapped access */
+                dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
+                if (dmap->qhead == 0) {     /* Wrapped */
+                        dmap->byte_counter += dmap->bytes_in_use;
+                        if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
+                                long decr = dmap->byte_counter;
+                                dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
+                                decr -= dmap->byte_counter;
+                                dmap->user_counter -= decr;
+                        }
+                }
+                dmap->qlen++;   /* Yes increment it (don't decrement) */
+                if (!(adev->flags & DMA_AUTOMODE))
+                        dmap->flags &= ~DMA_ACTIVE;
+                dmap->counts[dmap->qhead] = dmap->fragment_size;
+                DMAbuf_launch_output(dev, dmap);
+                finish_output_interrupt(dev, dmap);
+                return;
+        }
+
+        dmap->qlen--;
+        this_fragment = dmap->qhead;
+        dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
+
+        if (dmap->qhead == 0) { /* Wrapped */
+                dmap->byte_counter += dmap->bytes_in_use;
+                if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
+                        long decr = dmap->byte_counter;
+                        dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use);
+                        decr -= dmap->byte_counter;
+                        dmap->user_counter -= decr;
+                }
+        }
+        if (!(adev->flags & DMA_AUTOMODE))
+                dmap->flags &= ~DMA_ACTIVE;
+                
+        /*
+         *      This is  dmap->qlen <= 0 except when closing when
+         *      dmap->qlen < 0
+         */
+         
+        while (dmap->qlen <= -dmap->closing) {
+                dmap->underrun_count++;
+                dmap->qlen++;
+                if ((dmap->flags & DMA_DIRTY) && dmap->applic_profile != APF_CPUINTENS) {
+                        dmap->flags &= ~DMA_DIRTY;
+                        memset(adev->dmap_out->raw_buf, adev->dmap_out->neutral_byte,
+                               adev->dmap_out->buffsize);
+                }
+                dmap->user_counter += dmap->fragment_size;
+                dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
+        }
+        if (dmap->qlen > 0)
+                DMAbuf_launch_output(dev, dmap);
+        finish_output_interrupt(dev, dmap);
+}
+/* called in irq context */
+void DMAbuf_outputintr(int dev, int notify_only)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        unsigned long flags;
+        struct dma_buffparms *dmap = adev->dmap_out;
+
+        spin_lock_irqsave(&dmap->lock,flags);
+        if (!(dmap->flags & DMA_NODMA)) {
+                int chan = dmap->dma, pos, n;
+                unsigned long f;
+                
+                f=claim_dma_lock();
+                
+                if(!isa_dma_bridge_buggy)
+                        disable_dma(dmap->dma);
+                clear_dma_ff(chan);
+                pos = dmap->bytes_in_use - get_dma_residue(chan);
+                if(!isa_dma_bridge_buggy)
+                        enable_dma(dmap->dma);
+                release_dma_lock(f);
+                
+                pos = pos / dmap->fragment_size;        /* Actual qhead */
+                if (pos < 0 || pos >= dmap->nbufs)
+                        pos = 0;
+                n = 0;
+                while (dmap->qhead != pos && n++ < dmap->nbufs)
+                        do_outputintr(dev, notify_only);
+        }
+        else
+                do_outputintr(dev, notify_only);
+        spin_unlock_irqrestore(&dmap->lock,flags);
+}
+/* called with dmap->lock held in irq context */
+static void do_inputintr(int dev)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_in;
+
+        if (dmap->raw_buf == NULL) {
+                printk(KERN_ERR "Sound: Fatal error. Audio interrupt after freeing buffers.\n");
+                return;
+        }
+        if (dmap->mapping_flags & DMA_MAP_MAPPED) {
+                dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
+                if (dmap->qtail == 0) {         /* Wrapped */
+                        dmap->byte_counter += dmap->bytes_in_use;
+                        if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
+                                long decr = dmap->byte_counter;
+                                dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
+                                decr -= dmap->byte_counter;
+                                dmap->user_counter -= decr;
+                        }
+                }
+                dmap->qlen++;
+
+                if (!(adev->flags & DMA_AUTOMODE)) {
+                        if (dmap->needs_reorg)
+                                reorganize_buffers(dev, dmap, 0);
+                        local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use,DMA_MODE_READ);
+                        adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size,
+                                             dmap->fragment_size, 1);
+                        if (adev->d->trigger)
+                                adev->d->trigger(dev, adev->enable_bits * adev->go);
+                }
+                dmap->flags |= DMA_ACTIVE;
+        } else if (dmap->qlen >= (dmap->nbufs - 1)) {
+                printk(KERN_WARNING "Sound: Recording overrun\n");
+                dmap->underrun_count++;
+
+                /* Just throw away the oldest fragment but keep the engine running */
+                dmap->qhead = (dmap->qhead + 1) % dmap->nbufs;
+                dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
+        } else if (dmap->qlen >= 0 && dmap->qlen < dmap->nbufs) {
+                dmap->qlen++;
+                dmap->qtail = (dmap->qtail + 1) % dmap->nbufs;
+                if (dmap->qtail == 0) {         /* Wrapped */
+                        dmap->byte_counter += dmap->bytes_in_use;
+                        if (dmap->byte_counter >= dmap->max_byte_counter) {     /* Overflow */
+                                long decr = dmap->byte_counter;
+                                dmap->byte_counter = (dmap->byte_counter % dmap->bytes_in_use) + dmap->bytes_in_use;
+                                decr -= dmap->byte_counter;
+                                dmap->user_counter -= decr;
+                        }
+                }
+        }
+        if (!(adev->flags & DMA_AUTOMODE) || (dmap->flags & DMA_NODMA)) {
+                local_start_dma(adev, dmap->raw_buf_phys, dmap->bytes_in_use, DMA_MODE_READ);
+                adev->d->start_input(dev, dmap->raw_buf_phys + dmap->qtail * dmap->fragment_size, dmap->fragment_size, 1);
+                if (adev->d->trigger)
+                        adev->d->trigger(dev,adev->enable_bits * adev->go);
+        }
+        dmap->flags |= DMA_ACTIVE;
+        if (dmap->qlen > 0)
+        {
+                wake_up(&adev->in_sleeper);
+                wake_up(&adev->poll_sleeper);
+        }
+}
+/* called in irq context */
+void DMAbuf_inputintr(int dev)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_in;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dmap->lock,flags);
+
+        if (!(dmap->flags & DMA_NODMA)) {
+                int chan = dmap->dma, pos, n;
+                unsigned long f;
+                
+                f=claim_dma_lock();
+                if(!isa_dma_bridge_buggy)
+                        disable_dma(dmap->dma);
+                clear_dma_ff(chan);
+                pos = dmap->bytes_in_use - get_dma_residue(chan);
+                if(!isa_dma_bridge_buggy)
+                        enable_dma(dmap->dma);
+                release_dma_lock(f);
+
+                pos = pos / dmap->fragment_size;        /* Actual qhead */
+                if (pos < 0 || pos >= dmap->nbufs)
+                        pos = 0;
+
+                n = 0;
+                while (dmap->qtail != pos && ++n < dmap->nbufs)
+                        do_inputintr(dev);
+        } else
+                do_inputintr(dev);
+        spin_unlock_irqrestore(&dmap->lock,flags);
+}
+
+int DMAbuf_open_dma(int dev)
+{
+        /*
+         *    NOTE!  This routine opens only the primary DMA channel (output).
+         */
+        struct audio_operations *adev = audio_devs[dev];
+        int err;
+
+        if ((err = open_dmap(adev, OPEN_READWRITE, adev->dmap_out)) < 0)
+                return -EBUSY;
+        dma_init_buffers(adev->dmap_out);
+        adev->dmap_out->flags |= DMA_ALLOC_DONE;
+        adev->dmap_out->fragment_size = adev->dmap_out->buffsize;
+
+        if (adev->dmap_out->dma >= 0) {
+                unsigned long flags;
+
+                flags=claim_dma_lock();
+                clear_dma_ff(adev->dmap_out->dma);
+                disable_dma(adev->dmap_out->dma);
+                release_dma_lock(flags);
+        }
+        return 0;
+}
+
+void DMAbuf_close_dma(int dev)
+{
+        close_dmap(audio_devs[dev], audio_devs[dev]->dmap_out);
+}
+
+void DMAbuf_init(int dev, int dma1, int dma2)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        /*
+         * NOTE! This routine could be called several times.
+         */
+
+        /* drag in audio_syms.o */
+        {
+                extern char audio_syms_symbol;
+                audio_syms_symbol = 0;
+        }
+
+        if (adev && adev->dmap_out == NULL) {
+                if (adev->d == NULL)
+                        panic("OSS: audio_devs[%d]->d == NULL\n", dev);
+
+                if (adev->parent_dev) {  /* Use DMA map of the parent dev */
+                        int parent = adev->parent_dev - 1;
+                        adev->dmap_out = audio_devs[parent]->dmap_out;
+                        adev->dmap_in = audio_devs[parent]->dmap_in;
+                } else {
+                        adev->dmap_out = adev->dmap_in = &adev->dmaps[0];
+                        adev->dmap_out->dma = dma1;
+                        if (adev->flags & DMA_DUPLEX) {
+                                adev->dmap_in = &adev->dmaps[1];
+                                adev->dmap_in->dma = dma2;
+                        }
+                }
+                /* Persistent DMA buffers allocated here */
+                if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
+                        if (adev->dmap_in->raw_buf == NULL)
+                                sound_alloc_dmap(adev->dmap_in);
+                        if (adev->dmap_out->raw_buf == NULL)
+                                sound_alloc_dmap(adev->dmap_out);
+                }
+        }
+}
+
+/* No kernel lock - DMAbuf_activate_recording protected by global cli/sti */
+static unsigned int poll_input(struct file * file, int dev, poll_table *wait)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_in;
+
+        if (!(adev->open_mode & OPEN_READ))
+                return 0;
+        if (dmap->mapping_flags & DMA_MAP_MAPPED) {
+                if (dmap->qlen)
+                        return POLLIN | POLLRDNORM;
+                return 0;
+        }
+        if (dmap->dma_mode != DMODE_INPUT) {
+                if (dmap->dma_mode == DMODE_NONE &&
+                    adev->enable_bits & PCM_ENABLE_INPUT &&
+                    !dmap->qlen && adev->go) {
+                        unsigned long flags;
+                        
+                        spin_lock_irqsave(&dmap->lock,flags);
+                        DMAbuf_activate_recording(dev, dmap);
+                        spin_unlock_irqrestore(&dmap->lock,flags);
+                }
+                return 0;
+        }
+        if (!dmap->qlen)
+                return 0;
+        return POLLIN | POLLRDNORM;
+}
+
+static unsigned int poll_output(struct file * file, int dev, poll_table *wait)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        struct dma_buffparms *dmap = adev->dmap_out;
+        
+        if (!(adev->open_mode & OPEN_WRITE))
+                return 0;
+        if (dmap->mapping_flags & DMA_MAP_MAPPED) {
+                if (dmap->qlen)
+                        return POLLOUT | POLLWRNORM;
+                return 0;
+        }
+        if (dmap->dma_mode == DMODE_INPUT)
+                return 0;
+        if (dmap->dma_mode == DMODE_NONE)
+                return POLLOUT | POLLWRNORM;
+        if (!DMAbuf_space_in_queue(dev))
+                return 0;
+        return POLLOUT | POLLWRNORM;
+}
+
+unsigned int DMAbuf_poll(struct file * file, int dev, poll_table *wait)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        poll_wait(file, &adev->poll_sleeper, wait);
+        return poll_input(file, dev, wait) | poll_output(file, dev, wait);
+}
+
+void DMAbuf_deinit(int dev)
+{
+        struct audio_operations *adev = audio_devs[dev];
+        /* This routine is called when driver is being unloaded */
+        if (!adev)
+                return;
+
+        /* Persistent DMA buffers deallocated here */
+        if (sound_dmap_flag == DMAP_KEEP_ON_CLOSE) {
+                sound_free_dmap(adev->dmap_out);
+                if (adev->flags & DMA_DUPLEX)
+                        sound_free_dmap(adev->dmap_in);
+        }
+}