diff options
Diffstat (limited to 'sound/oss/audio.c')
| -rw-r--r-- | sound/oss/audio.c | 983 |
1 files changed, 983 insertions, 0 deletions
diff --git a/sound/oss/audio.c b/sound/oss/audio.c new file mode 100644 index 0000000..89bd27a --- /dev/null +++ b/sound/oss/audio.c @@ -0,0 +1,983 @@ +/* + * 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: + file->f_flags |= O_NONBLOCK; + 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; + + /* Substract 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; + /* Substract 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); +} |
