cregit-Linux how code gets into the kernel

Release 4.7 sound/oss/audio.c

Directory: sound/oss
/*
 * 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; }

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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; }

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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; }

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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); }

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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]]; }

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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; }

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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; }

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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); }

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void audio_init_devices(void) { /* * NOTE! This routine could be called several times during boot. */ }

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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; }

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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; }

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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); }

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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); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git152191.63%964.29%
peter waechtlerpeter waechtler1307.83%214.29%
al viroal viro70.42%17.14%
lucas de marchilucas de marchi10.06%17.14%
christoph hellwigchristoph hellwig10.06%17.14%
Total1660100.00%14100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git479794.11%3579.55%
peter waechtlerpeter waechtler1422.79%24.55%
linus torvaldslinus torvalds871.71%12.27%
al viroal viro290.57%12.27%
christoph hellwigchristoph hellwig230.45%24.55%
jonathan corbetjonathan corbet160.31%12.27%
lucas de marchilucas de marchi20.04%12.27%
uwe zeisbergeruwe zeisberger10.02%12.27%
Total5097100.00%44100.00%
Directory: sound/oss
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