--- /dev/null
+/*
+ * sound/oss/audio.c
+ *
+ * Device file manager for /dev/audio
+ */
+
+/*
+ * 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)
+ * 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 : use more logical O_NONBLOCK semantics
+ * Daniel Rodriksson: reworked the use of the device specific copy_user
+ * still generic
+ * Horst von Brand: Add missing #include <linux/string.h>
+ * Chris Rankin : Update the module-usage counter for the coprocessor,
+ * and decrement the counters again if we cannot open
+ * the audio device.
+ */
+
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/kmod.h>
+
+#include "sound_config.h"
+#include "ulaw.h"
+#include "coproc.h"
+
+#define NEUTRAL8 0x80
+#define NEUTRAL16 0x00
+
+
+static int dma_ioctl(int dev, unsigned int cmd, void __user *arg);
+
+static int set_format(int dev, int fmt)
+{
+ if (fmt != AFMT_QUERY)
+ {
+ audio_devs[dev]->local_conversion = 0;
+
+ if (!(audio_devs[dev]->format_mask & fmt)) /* Not supported */
+ {
+ if (fmt == AFMT_MU_LAW)
+ {
+ fmt = AFMT_U8;
+ audio_devs[dev]->local_conversion = CNV_MU_LAW;
+ }
+ else
+ fmt = AFMT_U8; /* This is always supported */
+ }
+ audio_devs[dev]->audio_format = audio_devs[dev]->d->set_bits(dev, fmt);
+ audio_devs[dev]->local_format = fmt;
+ }
+ else
+ return audio_devs[dev]->local_format;
+
+ if (audio_devs[dev]->local_conversion)
+ return audio_devs[dev]->local_conversion;
+ else
+ return audio_devs[dev]->local_format;
+}
+
+int audio_open(int dev, struct file *file)
+{
+ int ret;
+ int bits;
+ int dev_type = dev & 0x0f;
+ int mode = translate_mode(file);
+ const struct audio_driver *driver;
+ const struct coproc_operations *coprocessor;
+
+ dev = dev >> 4;
+
+ if (dev_type == SND_DEV_DSP16)
+ bits = 16;
+ else
+ bits = 8;
+
+ if (dev < 0 || dev >= num_audiodevs)
+ return -ENXIO;
+
+ driver = audio_devs[dev]->d;
+
+ if (!try_module_get(driver->owner))
+ return -ENODEV;
+
+ if ((ret = DMAbuf_open(dev, mode)) < 0)
+ goto error_1;
+
+ if ( (coprocessor = audio_devs[dev]->coproc) != NULL ) {
+ if (!try_module_get(coprocessor->owner))
+ goto error_2;
+
+ if ((ret = coprocessor->open(coprocessor->devc, COPR_PCM)) < 0) {
+ printk(KERN_WARNING "Sound: Can't access coprocessor device\n");
+ goto error_3;
+ }
+ }
+
+ audio_devs[dev]->local_conversion = 0;
+
+ if (dev_type == SND_DEV_AUDIO)
+ set_format(dev, AFMT_MU_LAW);
+ else
+ set_format(dev, bits);
+
+ audio_devs[dev]->audio_mode = AM_NONE;
+
+ return 0;
+
+ /*
+ * Clean-up stack: this is what needs (un)doing if
+ * we can't open the audio device ...
+ */
+ error_3:
+ module_put(coprocessor->owner);
+
+ error_2:
+ DMAbuf_release(dev, mode);
+
+ error_1:
+ module_put(driver->owner);
+
+ return ret;
+}
+
+static void sync_output(int dev)
+{
+ int p, i;
+ int l;
+ struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
+
+ if (dmap->fragment_size <= 0)
+ return;
+ dmap->flags |= DMA_POST;
+
+ /* Align the write pointer with fragment boundaries */
+
+ if ((l = dmap->user_counter % dmap->fragment_size) > 0)
+ {
+ int len;
+ unsigned long offs = dmap->user_counter % dmap->bytes_in_use;
+
+ len = dmap->fragment_size - l;
+ memset(dmap->raw_buf + offs, dmap->neutral_byte, len);
+ DMAbuf_move_wrpointer(dev, len);
+ }
+
+ /*
+ * Clean all unused buffer fragments.
+ */
+
+ p = dmap->qtail;
+ dmap->flags |= DMA_POST;
+
+ for (i = dmap->qlen + 1; i < dmap->nbufs; i++)
+ {
+ p = (p + 1) % dmap->nbufs;
+ if (((dmap->raw_buf + p * dmap->fragment_size) + dmap->fragment_size) >
+ (dmap->raw_buf + dmap->buffsize))
+ printk(KERN_ERR "audio: Buffer error 2\n");
+
+ memset(dmap->raw_buf + p * dmap->fragment_size,
+ dmap->neutral_byte,
+ dmap->fragment_size);
+ }
+
+ dmap->flags |= DMA_DIRTY;
+}
+
+void audio_release(int dev, struct file *file)
+{
+ const struct coproc_operations *coprocessor;
+ int mode = translate_mode(file);
+
+ dev = dev >> 4;
+
+ /*
+ * We do this in DMAbuf_release(). Why are we doing it
+ * here? Why don't we test the file mode before setting
+ * both flags? DMAbuf_release() does.
+ * ...pester...pester...pester...
+ */
+ audio_devs[dev]->dmap_out->closing = 1;
+ audio_devs[dev]->dmap_in->closing = 1;
+
+ /*
+ * We need to make sure we allocated the dmap_out buffer
+ * before we go mucking around with it in sync_output().
+ */
+ if (mode & OPEN_WRITE)
+ sync_output(dev);
+
+ if ( (coprocessor = audio_devs[dev]->coproc) != NULL ) {
+ coprocessor->close(coprocessor->devc, COPR_PCM);
+ module_put(coprocessor->owner);
+ }
+ DMAbuf_release(dev, mode);
+
+ module_put(audio_devs[dev]->d->owner);
+}
+
+static void translate_bytes(const unsigned char *table, unsigned char *buff, int n)
+{
+ unsigned long i;
+
+ if (n <= 0)
+ return;
+
+ for (i = 0; i < n; ++i)
+ buff[i] = table[buff[i]];
+}
+
+int audio_write(int dev, struct file *file, const char __user *buf, int count)
+{
+ int c, p, l, buf_size, used, returned;
+ int err;
+ char *dma_buf;
+
+ dev = dev >> 4;
+
+ p = 0;
+ c = count;
+
+ if(count < 0)
+ return -EINVAL;
+
+ if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return -EPERM;
+
+ if (audio_devs[dev]->flags & DMA_DUPLEX)
+ audio_devs[dev]->audio_mode |= AM_WRITE;
+ else
+ audio_devs[dev]->audio_mode = AM_WRITE;
+
+ if (!count) /* Flush output */
+ {
+ sync_output(dev);
+ return 0;
+ }
+
+ while (c)
+ {
+ if ((err = DMAbuf_getwrbuffer(dev, &dma_buf, &buf_size, !!(file->f_flags & O_NONBLOCK))) < 0)
+ {
+ /* Handle nonblocking mode */
+ if ((file->f_flags & O_NONBLOCK) && err == -EAGAIN)
+ return p? p : -EAGAIN; /* No more space. Return # of accepted bytes */
+ return err;
+ }
+ l = c;
+
+ if (l > buf_size)
+ l = buf_size;
+
+ returned = l;
+ used = l;
+ if (!audio_devs[dev]->d->copy_user)
+ {
+ if ((dma_buf + l) >
+ (audio_devs[dev]->dmap_out->raw_buf + audio_devs[dev]->dmap_out->buffsize))
+ {
+ printk(KERN_ERR "audio: Buffer error 3 (%lx,%d), (%lx, %d)\n", (long) dma_buf, l, (long) audio_devs[dev]->dmap_out->raw_buf, (int) audio_devs[dev]->dmap_out->buffsize);
+ return -EDOM;
+ }
+ if (dma_buf < audio_devs[dev]->dmap_out->raw_buf)
+ {
+ printk(KERN_ERR "audio: Buffer error 13 (%lx<%lx)\n", (long) dma_buf, (long) audio_devs[dev]->dmap_out->raw_buf);
+ return -EDOM;
+ }
+ if(copy_from_user(dma_buf, &(buf)[p], l))
+ return -EFAULT;
+ }
+ else audio_devs[dev]->d->copy_user (dev,
+ dma_buf, 0,
+ buf, p,
+ c, buf_size,
+ &used, &returned,
+ l);
+ l = returned;
+
+ if (audio_devs[dev]->local_conversion & CNV_MU_LAW)
+ {
+ translate_bytes(ulaw_dsp, (unsigned char *) dma_buf, l);
+ }
+ c -= used;
+ p += used;
+ DMAbuf_move_wrpointer(dev, l);
+
+ }
+
+ return count;
+}
+
+int audio_read(int dev, struct file *file, char __user *buf, int count)
+{
+ int c, p, l;
+ char *dmabuf;
+ int buf_no;
+
+ dev = dev >> 4;
+ p = 0;
+ c = count;
+
+ if (!(audio_devs[dev]->open_mode & OPEN_READ))
+ return -EPERM;
+
+ if ((audio_devs[dev]->audio_mode & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
+ sync_output(dev);
+
+ if (audio_devs[dev]->flags & DMA_DUPLEX)
+ audio_devs[dev]->audio_mode |= AM_READ;
+ else
+ audio_devs[dev]->audio_mode = AM_READ;
+
+ while(c)
+ {
+ if ((buf_no = DMAbuf_getrdbuffer(dev, &dmabuf, &l, !!(file->f_flags & O_NONBLOCK))) < 0)
+ {
+ /*
+ * Nonblocking mode handling. Return current # of bytes
+ */
+
+ if (p > 0) /* Avoid throwing away data */
+ return p; /* Return it instead */
+
+ if ((file->f_flags & O_NONBLOCK) && buf_no == -EAGAIN)
+ return -EAGAIN;
+
+ return buf_no;
+ }
+ if (l > c)
+ l = c;
+
+ /*
+ * Insert any local processing here.
+ */
+
+ if (audio_devs[dev]->local_conversion & CNV_MU_LAW)
+ {
+ translate_bytes(dsp_ulaw, (unsigned char *) dmabuf, l);
+ }
+
+ {
+ char *fixit = dmabuf;
+
+ if(copy_to_user(&(buf)[p], fixit, l))
+ return -EFAULT;
+ }
+
+ DMAbuf_rmchars(dev, buf_no, l);
+
+ p += l;
+ c -= l;
+ }
+
+ return count - c;
+}
+
+int audio_ioctl(int dev, struct file *file, unsigned int cmd, void __user *arg)
+{
+ int val, count;
+ unsigned long flags;
+ struct dma_buffparms *dmap;
+ int __user *p = arg;
+
+ dev = dev >> 4;
+
+ if (_IOC_TYPE(cmd) == 'C') {
+ if (audio_devs[dev]->coproc) /* Coprocessor ioctl */
+ return audio_devs[dev]->coproc->ioctl(audio_devs[dev]->coproc->devc, cmd, arg, 0);
+ /* else
+ printk(KERN_DEBUG"/dev/dsp%d: No coprocessor for this device\n", dev); */
+ return -ENXIO;
+ }
+ else switch (cmd)
+ {
+ case SNDCTL_DSP_SYNC:
+ if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return 0;
+ if (audio_devs[dev]->dmap_out->fragment_size == 0)
+ return 0;
+ sync_output(dev);
+ DMAbuf_sync(dev);
+ DMAbuf_reset(dev);
+ return 0;
+
+ case SNDCTL_DSP_POST:
+ if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return 0;
+ if (audio_devs[dev]->dmap_out->fragment_size == 0)
+ return 0;
+ audio_devs[dev]->dmap_out->flags |= DMA_POST | DMA_DIRTY;
+ sync_output(dev);
+ dma_ioctl(dev, SNDCTL_DSP_POST, NULL);
+ return 0;
+
+ case SNDCTL_DSP_RESET:
+ audio_devs[dev]->audio_mode = AM_NONE;
+ DMAbuf_reset(dev);
+ return 0;
+
+ case SNDCTL_DSP_GETFMTS:
+ val = audio_devs[dev]->format_mask | AFMT_MU_LAW;
+ break;
+
+ case SNDCTL_DSP_SETFMT:
+ if (get_user(val, p))
+ return -EFAULT;
+ val = set_format(dev, val);
+ break;
+
+ case SNDCTL_DSP_GETISPACE:
+ if (!(audio_devs[dev]->open_mode & OPEN_READ))
+ return 0;
+ if ((audio_devs[dev]->audio_mode & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
+ return -EBUSY;
+ return dma_ioctl(dev, cmd, arg);
+
+ case SNDCTL_DSP_GETOSPACE:
+ if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return -EPERM;
+ if ((audio_devs[dev]->audio_mode & AM_READ) && !(audio_devs[dev]->flags & DMA_DUPLEX))
+ return -EBUSY;
+ return dma_ioctl(dev, cmd, arg);
+
+ case SNDCTL_DSP_NONBLOCK:
+ spin_lock(&file->f_lock);
+ file->f_flags |= O_NONBLOCK;
+ spin_unlock(&file->f_lock);
+ return 0;
+
+ case SNDCTL_DSP_GETCAPS:
+ val = 1 | DSP_CAP_MMAP; /* Revision level of this ioctl() */
+ if (audio_devs[dev]->flags & DMA_DUPLEX &&
+ audio_devs[dev]->open_mode == OPEN_READWRITE)
+ val |= DSP_CAP_DUPLEX;
+ if (audio_devs[dev]->coproc)
+ val |= DSP_CAP_COPROC;
+ if (audio_devs[dev]->d->local_qlen) /* Device has hidden buffers */
+ val |= DSP_CAP_BATCH;
+ if (audio_devs[dev]->d->trigger) /* Supports SETTRIGGER */
+ val |= DSP_CAP_TRIGGER;
+ break;
+
+ case SOUND_PCM_WRITE_RATE:
+ if (get_user(val, p))
+ return -EFAULT;
+ val = audio_devs[dev]->d->set_speed(dev, val);
+ break;
+
+ case SOUND_PCM_READ_RATE:
+ val = audio_devs[dev]->d->set_speed(dev, 0);
+ break;
+
+ case SNDCTL_DSP_STEREO:
+ if (get_user(val, p))
+ return -EFAULT;
+ if (val > 1 || val < 0)
+ return -EINVAL;
+ val = audio_devs[dev]->d->set_channels(dev, val + 1) - 1;
+ break;
+
+ case SOUND_PCM_WRITE_CHANNELS:
+ if (get_user(val, p))
+ return -EFAULT;
+ val = audio_devs[dev]->d->set_channels(dev, val);
+ break;
+
+ case SOUND_PCM_READ_CHANNELS:
+ val = audio_devs[dev]->d->set_channels(dev, 0);
+ break;
+
+ case SOUND_PCM_READ_BITS:
+ val = audio_devs[dev]->d->set_bits(dev, 0);
+ break;
+
+ case SNDCTL_DSP_SETDUPLEX:
+ if (audio_devs[dev]->open_mode != OPEN_READWRITE)
+ return -EPERM;
+ return (audio_devs[dev]->flags & DMA_DUPLEX) ? 0 : -EIO;
+
+ case SNDCTL_DSP_PROFILE:
+ if (get_user(val, p))
+ return -EFAULT;
+ if (audio_devs[dev]->open_mode & OPEN_WRITE)
+ audio_devs[dev]->dmap_out->applic_profile = val;
+ if (audio_devs[dev]->open_mode & OPEN_READ)
+ audio_devs[dev]->dmap_in->applic_profile = val;
+ return 0;
+
+ case SNDCTL_DSP_GETODELAY:
+ dmap = audio_devs[dev]->dmap_out;
+ if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return -EINVAL;
+ if (!(dmap->flags & DMA_ALLOC_DONE))
+ {
+ val=0;
+ break;
+ }
+
+ spin_lock_irqsave(&dmap->lock,flags);
+ /* Compute number of bytes that have been played */
+ count = DMAbuf_get_buffer_pointer (dev, dmap, DMODE_OUTPUT);
+ if (count < dmap->fragment_size && dmap->qhead != 0)
+ count += dmap->bytes_in_use; /* Pointer wrap not handled yet */
+ count += dmap->byte_counter;
+
+ /* Subtract current count from the number of bytes written by app */
+ count = dmap->user_counter - count;
+ if (count < 0)
+ count = 0;
+ spin_unlock_irqrestore(&dmap->lock,flags);
+ val = count;
+ break;
+
+ default:
+ return dma_ioctl(dev, cmd, arg);
+ }
+ return put_user(val, p);
+}
+
+void audio_init_devices(void)
+{
+ /*
+ * NOTE! This routine could be called several times during boot.
+ */
+}
+
+void reorganize_buffers(int dev, struct dma_buffparms *dmap, int recording)
+{
+ /*
+ * This routine breaks the physical device buffers to logical ones.
+ */
+
+ struct audio_operations *dsp_dev = audio_devs[dev];
+
+ unsigned i, n;
+ unsigned sr, nc, sz, bsz;
+
+ sr = dsp_dev->d->set_speed(dev, 0);
+ nc = dsp_dev->d->set_channels(dev, 0);
+ sz = dsp_dev->d->set_bits(dev, 0);
+
+ if (sz == 8)
+ dmap->neutral_byte = NEUTRAL8;
+ else
+ dmap->neutral_byte = NEUTRAL16;
+
+ if (sr < 1 || nc < 1 || sz < 1)
+ {
+/* printk(KERN_DEBUG "Warning: Invalid PCM parameters[%d] sr=%d, nc=%d, sz=%d\n", dev, sr, nc, sz);*/
+ sr = DSP_DEFAULT_SPEED;
+ nc = 1;
+ sz = 8;
+ }
+
+ sz = sr * nc * sz;
+
+ sz /= 8; /* #bits -> #bytes */
+ dmap->data_rate = sz;
+
+ if (!dmap->needs_reorg)
+ return;
+ dmap->needs_reorg = 0;
+
+ if (dmap->fragment_size == 0)
+ {
+ /* Compute the fragment size using the default algorithm */
+
+ /*
+ * Compute a buffer size for time not exceeding 1 second.
+ * Usually this algorithm gives a buffer size for 0.5 to 1.0 seconds
+ * of sound (using the current speed, sample size and #channels).
+ */
+
+ bsz = dmap->buffsize;
+ while (bsz > sz)
+ bsz /= 2;
+
+ if (bsz == dmap->buffsize)
+ bsz /= 2; /* Needs at least 2 buffers */
+
+ /*
+ * Split the computed fragment to smaller parts. After 3.5a9
+ * the default subdivision is 4 which should give better
+ * results when recording.
+ */
+
+ if (dmap->subdivision == 0) /* Not already set */
+ {
+ dmap->subdivision = 4; /* Init to the default value */
+
+ if ((bsz / dmap->subdivision) > 4096)
+ dmap->subdivision *= 2;
+ if ((bsz / dmap->subdivision) < 4096)
+ dmap->subdivision = 1;
+ }
+ bsz /= dmap->subdivision;
+
+ if (bsz < 16)
+ bsz = 16; /* Just a sanity check */
+
+ dmap->fragment_size = bsz;
+ }
+ else
+ {
+ /*
+ * The process has specified the buffer size with SNDCTL_DSP_SETFRAGMENT or
+ * the buffer size computation has already been done.
+ */
+ if (dmap->fragment_size > (dmap->buffsize / 2))
+ dmap->fragment_size = (dmap->buffsize / 2);
+ bsz = dmap->fragment_size;
+ }
+
+ if (audio_devs[dev]->min_fragment)
+ if (bsz < (1 << audio_devs[dev]->min_fragment))
+ bsz = 1 << audio_devs[dev]->min_fragment;
+ if (audio_devs[dev]->max_fragment)
+ if (bsz > (1 << audio_devs[dev]->max_fragment))
+ bsz = 1 << audio_devs[dev]->max_fragment;
+ bsz &= ~0x07; /* Force size which is multiple of 8 bytes */
+#ifdef OS_DMA_ALIGN_CHECK
+ OS_DMA_ALIGN_CHECK(bsz);
+#endif
+
+ n = dmap->buffsize / bsz;
+ if (n > MAX_SUB_BUFFERS)
+ n = MAX_SUB_BUFFERS;
+ if (n > dmap->max_fragments)
+ n = dmap->max_fragments;
+
+ if (n < 2)
+ {
+ n = 2;
+ bsz /= 2;
+ }
+ dmap->nbufs = n;
+ dmap->bytes_in_use = n * bsz;
+ dmap->fragment_size = bsz;
+ dmap->max_byte_counter = (dmap->data_rate * 60 * 60) +
+ dmap->bytes_in_use; /* Approximately one hour */
+
+ if (dmap->raw_buf)
+ {
+ memset(dmap->raw_buf, dmap->neutral_byte, dmap->bytes_in_use);
+ }
+
+ for (i = 0; i < dmap->nbufs; i++)
+ {
+ dmap->counts[i] = 0;
+ }
+
+ dmap->flags |= DMA_ALLOC_DONE | DMA_EMPTY;
+}
+
+static int dma_subdivide(int dev, struct dma_buffparms *dmap, int fact)
+{
+ if (fact == 0)
+ {
+ fact = dmap->subdivision;
+ if (fact == 0)
+ fact = 1;
+ return fact;
+ }
+ if (dmap->subdivision != 0 || dmap->fragment_size) /* Too late to change */
+ return -EINVAL;
+
+ if (fact > MAX_REALTIME_FACTOR)
+ return -EINVAL;
+
+ if (fact != 1 && fact != 2 && fact != 4 && fact != 8 && fact != 16)
+ return -EINVAL;
+
+ dmap->subdivision = fact;
+ return fact;
+}
+
+static int dma_set_fragment(int dev, struct dma_buffparms *dmap, int fact)
+{
+ int bytes, count;
+
+ if (fact == 0)
+ return -EIO;
+
+ if (dmap->subdivision != 0 ||
+ dmap->fragment_size) /* Too late to change */
+ return -EINVAL;
+
+ bytes = fact & 0xffff;
+ count = (fact >> 16) & 0x7fff;
+
+ if (count == 0)
+ count = MAX_SUB_BUFFERS;
+ else if (count < MAX_SUB_BUFFERS)
+ count++;
+
+ if (bytes < 4 || bytes > 17) /* <16 || > 512k */
+ return -EINVAL;
+
+ if (count < 2)
+ return -EINVAL;
+
+ if (audio_devs[dev]->min_fragment > 0)
+ if (bytes < audio_devs[dev]->min_fragment)
+ bytes = audio_devs[dev]->min_fragment;
+
+ if (audio_devs[dev]->max_fragment > 0)
+ if (bytes > audio_devs[dev]->max_fragment)
+ bytes = audio_devs[dev]->max_fragment;
+
+#ifdef OS_DMA_MINBITS
+ if (bytes < OS_DMA_MINBITS)
+ bytes = OS_DMA_MINBITS;
+#endif
+
+ dmap->fragment_size = (1 << bytes);
+ dmap->max_fragments = count;
+
+ if (dmap->fragment_size > dmap->buffsize)
+ dmap->fragment_size = dmap->buffsize;
+
+ if (dmap->fragment_size == dmap->buffsize &&
+ audio_devs[dev]->flags & DMA_AUTOMODE)
+ dmap->fragment_size /= 2; /* Needs at least 2 buffers */
+
+ dmap->subdivision = 1; /* Disable SNDCTL_DSP_SUBDIVIDE */
+ return bytes | ((count - 1) << 16);
+}
+
+static int dma_ioctl(int dev, unsigned int cmd, void __user *arg)
+{
+ struct dma_buffparms *dmap_out = audio_devs[dev]->dmap_out;
+ struct dma_buffparms *dmap_in = audio_devs[dev]->dmap_in;
+ struct dma_buffparms *dmap;
+ audio_buf_info info;
+ count_info cinfo;
+ int fact, ret, changed, bits, count, err;
+ unsigned long flags;
+
+ switch (cmd)
+ {
+ case SNDCTL_DSP_SUBDIVIDE:
+ ret = 0;
+ if (get_user(fact, (int __user *)arg))
+ return -EFAULT;
+ if (audio_devs[dev]->open_mode & OPEN_WRITE)
+ ret = dma_subdivide(dev, dmap_out, fact);
+ if (ret < 0)
+ return ret;
+ if (audio_devs[dev]->open_mode != OPEN_WRITE ||
+ (audio_devs[dev]->flags & DMA_DUPLEX &&
+ audio_devs[dev]->open_mode & OPEN_READ))
+ ret = dma_subdivide(dev, dmap_in, fact);
+ if (ret < 0)
+ return ret;
+ break;
+
+ case SNDCTL_DSP_GETISPACE:
+ case SNDCTL_DSP_GETOSPACE:
+ dmap = dmap_out;
+ if (cmd == SNDCTL_DSP_GETISPACE && !(audio_devs[dev]->open_mode & OPEN_READ))
+ return -EINVAL;
+ if (cmd == SNDCTL_DSP_GETOSPACE && !(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return -EINVAL;
+ if (cmd == SNDCTL_DSP_GETISPACE && audio_devs[dev]->flags & DMA_DUPLEX)
+ dmap = dmap_in;
+ if (dmap->mapping_flags & DMA_MAP_MAPPED)
+ return -EINVAL;
+ if (!(dmap->flags & DMA_ALLOC_DONE))
+ reorganize_buffers(dev, dmap, (cmd == SNDCTL_DSP_GETISPACE));
+ info.fragstotal = dmap->nbufs;
+ if (cmd == SNDCTL_DSP_GETISPACE)
+ info.fragments = dmap->qlen;
+ else
+ {
+ if (!DMAbuf_space_in_queue(dev))
+ info.fragments = 0;
+ else
+ {
+ info.fragments = DMAbuf_space_in_queue(dev);
+ if (audio_devs[dev]->d->local_qlen)
+ {
+ int tmp = audio_devs[dev]->d->local_qlen(dev);
+ if (tmp && info.fragments)
+ tmp--; /*
+ * This buffer has been counted twice
+ */
+ info.fragments -= tmp;
+ }
+ }
+ }
+ if (info.fragments < 0)
+ info.fragments = 0;
+ else if (info.fragments > dmap->nbufs)
+ info.fragments = dmap->nbufs;
+
+ info.fragsize = dmap->fragment_size;
+ info.bytes = info.fragments * dmap->fragment_size;
+
+ if (cmd == SNDCTL_DSP_GETISPACE && dmap->qlen)
+ info.bytes -= dmap->counts[dmap->qhead];
+ else
+ {
+ info.fragments = info.bytes / dmap->fragment_size;
+ info.bytes -= dmap->user_counter % dmap->fragment_size;
+ }
+ if (copy_to_user(arg, &info, sizeof(info)))
+ return -EFAULT;
+ return 0;
+
+ case SNDCTL_DSP_SETTRIGGER:
+ if (get_user(bits, (int __user *)arg))
+ return -EFAULT;
+ bits &= audio_devs[dev]->open_mode;
+ if (audio_devs[dev]->d->trigger == NULL)
+ return -EINVAL;
+ if (!(audio_devs[dev]->flags & DMA_DUPLEX) && (bits & PCM_ENABLE_INPUT) &&
+ (bits & PCM_ENABLE_OUTPUT))
+ return -EINVAL;
+
+ if (bits & PCM_ENABLE_INPUT)
+ {
+ spin_lock_irqsave(&dmap_in->lock,flags);
+ changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_INPUT;
+ if (changed && audio_devs[dev]->go)
+ {
+ reorganize_buffers(dev, dmap_in, 1);
+ if ((err = audio_devs[dev]->d->prepare_for_input(dev,
+ dmap_in->fragment_size, dmap_in->nbufs)) < 0) {
+ spin_unlock_irqrestore(&dmap_in->lock,flags);
+ return err;
+ }
+ dmap_in->dma_mode = DMODE_INPUT;
+ audio_devs[dev]->enable_bits |= PCM_ENABLE_INPUT;
+ DMAbuf_activate_recording(dev, dmap_in);
+ } else
+ audio_devs[dev]->enable_bits &= ~PCM_ENABLE_INPUT;
+ spin_unlock_irqrestore(&dmap_in->lock,flags);
+ }
+ if (bits & PCM_ENABLE_OUTPUT)
+ {
+ spin_lock_irqsave(&dmap_out->lock,flags);
+ changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_OUTPUT;
+ if (changed &&
+ (dmap_out->mapping_flags & DMA_MAP_MAPPED || dmap_out->qlen > 0) &&
+ audio_devs[dev]->go)
+ {
+ if (!(dmap_out->flags & DMA_ALLOC_DONE))
+ reorganize_buffers(dev, dmap_out, 0);
+ dmap_out->dma_mode = DMODE_OUTPUT;
+ audio_devs[dev]->enable_bits |= PCM_ENABLE_OUTPUT;
+ dmap_out->counts[dmap_out->qhead] = dmap_out->fragment_size;
+ DMAbuf_launch_output(dev, dmap_out);
+ } else
+ audio_devs[dev]->enable_bits &= ~PCM_ENABLE_OUTPUT;
+ spin_unlock_irqrestore(&dmap_out->lock,flags);
+ }
+#if 0
+ if (changed && audio_devs[dev]->d->trigger)
+ audio_devs[dev]->d->trigger(dev, bits * audio_devs[dev]->go);
+#endif
+ /* Falls through... */
+
+ case SNDCTL_DSP_GETTRIGGER:
+ ret = audio_devs[dev]->enable_bits;
+ break;
+
+ case SNDCTL_DSP_SETSYNCRO:
+ if (!audio_devs[dev]->d->trigger)
+ return -EINVAL;
+ audio_devs[dev]->d->trigger(dev, 0);
+ audio_devs[dev]->go = 0;
+ return 0;
+
+ case SNDCTL_DSP_GETIPTR:
+ if (!(audio_devs[dev]->open_mode & OPEN_READ))
+ return -EINVAL;
+ spin_lock_irqsave(&dmap_in->lock,flags);
+ cinfo.bytes = dmap_in->byte_counter;
+ cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_in, DMODE_INPUT) & ~3;
+ if (cinfo.ptr < dmap_in->fragment_size && dmap_in->qtail != 0)
+ cinfo.bytes += dmap_in->bytes_in_use; /* Pointer wrap not handled yet */
+ cinfo.blocks = dmap_in->qlen;
+ cinfo.bytes += cinfo.ptr;
+ if (dmap_in->mapping_flags & DMA_MAP_MAPPED)
+ dmap_in->qlen = 0; /* Reset interrupt counter */
+ spin_unlock_irqrestore(&dmap_in->lock,flags);
+ if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
+ return -EFAULT;
+ return 0;
+
+ case SNDCTL_DSP_GETOPTR:
+ if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return -EINVAL;
+
+ spin_lock_irqsave(&dmap_out->lock,flags);
+ cinfo.bytes = dmap_out->byte_counter;
+ cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_out, DMODE_OUTPUT) & ~3;
+ if (cinfo.ptr < dmap_out->fragment_size && dmap_out->qhead != 0)
+ cinfo.bytes += dmap_out->bytes_in_use; /* Pointer wrap not handled yet */
+ cinfo.blocks = dmap_out->qlen;
+ cinfo.bytes += cinfo.ptr;
+ if (dmap_out->mapping_flags & DMA_MAP_MAPPED)
+ dmap_out->qlen = 0; /* Reset interrupt counter */
+ spin_unlock_irqrestore(&dmap_out->lock,flags);
+ if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
+ return -EFAULT;
+ return 0;
+
+ case SNDCTL_DSP_GETODELAY:
+ if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
+ return -EINVAL;
+ if (!(dmap_out->flags & DMA_ALLOC_DONE))
+ {
+ ret=0;
+ break;
+ }
+ spin_lock_irqsave(&dmap_out->lock,flags);
+ /* Compute number of bytes that have been played */
+ count = DMAbuf_get_buffer_pointer (dev, dmap_out, DMODE_OUTPUT);
+ if (count < dmap_out->fragment_size && dmap_out->qhead != 0)
+ count += dmap_out->bytes_in_use; /* Pointer wrap not handled yet */
+ count += dmap_out->byte_counter;
+ /* Subtract current count from the number of bytes written by app */
+ count = dmap_out->user_counter - count;
+ if (count < 0)
+ count = 0;
+ spin_unlock_irqrestore(&dmap_out->lock,flags);
+ ret = count;
+ break;
+
+ case SNDCTL_DSP_POST:
+ if (audio_devs[dev]->dmap_out->qlen > 0)
+ if (!(audio_devs[dev]->dmap_out->flags & DMA_ACTIVE))
+ DMAbuf_launch_output(dev, audio_devs[dev]->dmap_out);
+ return 0;
+
+ case SNDCTL_DSP_GETBLKSIZE:
+ dmap = dmap_out;
+ if (audio_devs[dev]->open_mode & OPEN_WRITE)
+ reorganize_buffers(dev, dmap_out, (audio_devs[dev]->open_mode == OPEN_READ));
+ if (audio_devs[dev]->open_mode == OPEN_READ ||
+ (audio_devs[dev]->flags & DMA_DUPLEX &&
+ audio_devs[dev]->open_mode & OPEN_READ))
+ reorganize_buffers(dev, dmap_in, (audio_devs[dev]->open_mode == OPEN_READ));
+ if (audio_devs[dev]->open_mode == OPEN_READ)
+ dmap = dmap_in;
+ ret = dmap->fragment_size;
+ break;
+
+ case SNDCTL_DSP_SETFRAGMENT:
+ ret = 0;
+ if (get_user(fact, (int __user *)arg))
+ return -EFAULT;
+ if (audio_devs[dev]->open_mode & OPEN_WRITE)
+ ret = dma_set_fragment(dev, dmap_out, fact);
+ if (ret < 0)
+ return ret;
+ if (audio_devs[dev]->open_mode == OPEN_READ ||
+ (audio_devs[dev]->flags & DMA_DUPLEX &&
+ audio_devs[dev]->open_mode & OPEN_READ))
+ ret = dma_set_fragment(dev, dmap_in, fact);
+ if (ret < 0)
+ return ret;
+ if (!arg) /* don't know what this is good for, but preserve old semantics */
+ return 0;
+ break;
+
+ default:
+ if (!audio_devs[dev]->d->ioctl)
+ return -EINVAL;
+ return audio_devs[dev]->d->ioctl(dev, cmd, arg);
+ }
+ return put_user(ret, (int __user *)arg);
+}
Code Review / kvmfornfv.git / blobdiff