Linux-2.6.12-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!
diff --git a/sound/oss/dmabuf.c b/sound/oss/dmabuf.c
new file mode 100644
index 0000000..baf4244
--- /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);
+ }
+}