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- /*
- * compress_core.c - compress offload core
- *
- * Copyright (C) 2011 Intel Corporation
- * Authors: Vinod Koul <vinod.koul@linux.intel.com>
- * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- */
- #define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
- #define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
- #include <linux/file.h>
- #include <linux/fs.h>
- #include <linux/list.h>
- #include <linux/math64.h>
- #include <linux/mm.h>
- #include <linux/mutex.h>
- #include <linux/poll.h>
- #include <linux/slab.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/uio.h>
- #include <linux/uaccess.h>
- #include <linux/module.h>
- #include <sound/core.h>
- #include <sound/initval.h>
- #include <sound/compress_params.h>
- #include <sound/compress_offload.h>
- #include <sound/compress_driver.h>
- #define U32_MAX ((u32)~0U)
- /* TODO:
- * - add substream support for multiple devices in case of
- * SND_DYNAMIC_MINORS is not used
- * - Multiple node representation
- * driver should be able to register multiple nodes
- */
- static DEFINE_MUTEX(device_mutex);
- struct snd_compr_file {
- unsigned long caps;
- struct snd_compr_stream stream;
- };
- /*
- * a note on stream states used:
- * we use follwing states in the compressed core
- * SNDRV_PCM_STATE_OPEN: When stream has been opened.
- * SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
- * calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
- * state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
- * SNDRV_PCM_STATE_RUNNING: When stream has been started and is
- * decoding/encoding and rendering/capturing data.
- * SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
- * by calling SNDRV_COMPRESS_DRAIN.
- * SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
- * SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
- * SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
- */
- static int snd_compr_open(struct inode *inode, struct file *f)
- {
- struct snd_compr *compr;
- struct snd_compr_file *data;
- struct snd_compr_runtime *runtime;
- enum snd_compr_direction dirn;
- int maj = imajor(inode);
- int ret;
- if ((f->f_flags & O_ACCMODE) == O_WRONLY)
- dirn = SND_COMPRESS_PLAYBACK;
- else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
- dirn = SND_COMPRESS_CAPTURE;
- else
- return -EINVAL;
- if (maj == snd_major)
- compr = snd_lookup_minor_data(iminor(inode),
- SNDRV_DEVICE_TYPE_COMPRESS);
- else
- return -EBADFD;
- if (compr == NULL) {
- pr_err("no device data!!!\n");
- return -ENODEV;
- }
- if (dirn != compr->direction) {
- pr_err("this device doesn't support this direction\n");
- snd_card_unref(compr->card);
- return -EINVAL;
- }
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data) {
- snd_card_unref(compr->card);
- return -ENOMEM;
- }
- data->stream.ops = compr->ops;
- data->stream.direction = dirn;
- data->stream.private_data = compr->private_data;
- data->stream.device = compr;
- runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
- if (!runtime) {
- kfree(data);
- snd_card_unref(compr->card);
- return -ENOMEM;
- }
- runtime->state = SNDRV_PCM_STATE_OPEN;
- init_waitqueue_head(&runtime->sleep);
- data->stream.runtime = runtime;
- f->private_data = (void *)data;
- mutex_lock(&compr->lock);
- ret = compr->ops->open(&data->stream);
- mutex_unlock(&compr->lock);
- if (ret) {
- kfree(runtime);
- kfree(data);
- }
- snd_card_unref(compr->card);
- return ret;
- }
- static int snd_compr_free(struct inode *inode, struct file *f)
- {
- struct snd_compr_file *data = f->private_data;
- struct snd_compr_runtime *runtime = data->stream.runtime;
- switch (runtime->state) {
- case SNDRV_PCM_STATE_RUNNING:
- case SNDRV_PCM_STATE_DRAINING:
- case SNDRV_PCM_STATE_PAUSED:
- data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
- break;
- default:
- break;
- }
- data->stream.ops->free(&data->stream);
- kfree(data->stream.runtime->buffer);
- kfree(data->stream.runtime);
- kfree(data);
- return 0;
- }
- static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
- struct snd_compr_tstamp *tstamp)
- {
- int err = 0;
- if (!stream->ops->pointer)
- return -ENOTSUPP;
- err = stream->ops->pointer(stream, tstamp);
- if (err)
- return err;
- pr_debug("dsp consumed till %d total %d bytes\n",
- tstamp->byte_offset, tstamp->copied_total);
- if (stream->direction == SND_COMPRESS_PLAYBACK)
- stream->runtime->total_bytes_transferred = tstamp->copied_total;
- else
- stream->runtime->total_bytes_available = tstamp->copied_total;
- return 0;
- }
- static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
- struct snd_compr_avail *avail)
- {
- memset(avail, 0, sizeof(*avail));
- snd_compr_update_tstamp(stream, &avail->tstamp);
- /* Still need to return avail even if tstamp can't be filled in */
- if (stream->runtime->total_bytes_available == 0 &&
- stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
- stream->direction == SND_COMPRESS_PLAYBACK) {
- pr_debug("detected init and someone forgot to do a write\n");
- return stream->runtime->buffer_size;
- }
- pr_debug("app wrote %lld, DSP consumed %lld\n",
- stream->runtime->total_bytes_available,
- stream->runtime->total_bytes_transferred);
- if (stream->runtime->total_bytes_available ==
- stream->runtime->total_bytes_transferred) {
- if (stream->direction == SND_COMPRESS_PLAYBACK) {
- pr_debug("both pointers are same, returning full avail\n");
- return stream->runtime->buffer_size;
- } else {
- pr_debug("both pointers are same, returning no avail\n");
- return 0;
- }
- }
- avail->avail = stream->runtime->total_bytes_available -
- stream->runtime->total_bytes_transferred;
- if (stream->direction == SND_COMPRESS_PLAYBACK)
- avail->avail = stream->runtime->buffer_size - avail->avail;
- pr_debug("ret avail as %lld\n", avail->avail);
- return avail->avail;
- }
- static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
- {
- struct snd_compr_avail avail;
- return snd_compr_calc_avail(stream, &avail);
- }
- static int
- snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
- {
- struct snd_compr_avail ioctl_avail;
- size_t avail;
- avail = snd_compr_calc_avail(stream, &ioctl_avail);
- ioctl_avail.avail = avail;
- if (copy_to_user((__u64 __user *)arg,
- &ioctl_avail, sizeof(ioctl_avail)))
- return -EFAULT;
- return 0;
- }
- static int snd_compr_write_data(struct snd_compr_stream *stream,
- const char __user *buf, size_t count)
- {
- void *dstn;
- size_t copy;
- struct snd_compr_runtime *runtime = stream->runtime;
- /* 64-bit Modulus */
- u64 app_pointer = div64_u64(runtime->total_bytes_available,
- runtime->buffer_size);
- app_pointer = runtime->total_bytes_available -
- (app_pointer * runtime->buffer_size);
- dstn = runtime->buffer + app_pointer;
- pr_debug("copying %ld at %lld\n",
- (unsigned long)count, app_pointer);
- if (count < runtime->buffer_size - app_pointer) {
- if (copy_from_user(dstn, buf, count))
- return -EFAULT;
- } else {
- copy = runtime->buffer_size - app_pointer;
- if (copy_from_user(dstn, buf, copy))
- return -EFAULT;
- if (copy_from_user(runtime->buffer, buf + copy, count - copy))
- return -EFAULT;
- }
- /* if DSP cares, let it know data has been written */
- if (stream->ops->ack)
- stream->ops->ack(stream, count);
- return count;
- }
- static ssize_t snd_compr_write(struct file *f, const char __user *buf,
- size_t count, loff_t *offset)
- {
- struct snd_compr_file *data = f->private_data;
- struct snd_compr_stream *stream;
- size_t avail;
- int retval;
- if (snd_BUG_ON(!data))
- return -EFAULT;
- stream = &data->stream;
- mutex_lock(&stream->device->lock);
- /* write is allowed when stream is running or has been steup */
- if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
- stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
- mutex_unlock(&stream->device->lock);
- return -EBADFD;
- }
- avail = snd_compr_get_avail(stream);
- pr_debug("avail returned %ld\n", (unsigned long)avail);
- /* calculate how much we can write to buffer */
- if (avail > count)
- avail = count;
- if (stream->ops->copy) {
- char __user* cbuf = (char __user*)buf;
- retval = stream->ops->copy(stream, cbuf, avail);
- } else {
- retval = snd_compr_write_data(stream, buf, avail);
- }
- if (retval > 0)
- stream->runtime->total_bytes_available += retval;
- /* while initiating the stream, write should be called before START
- * call, so in setup move state */
- if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
- stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
- pr_debug("stream prepared, Houston we are good to go\n");
- }
- mutex_unlock(&stream->device->lock);
- return retval;
- }
- static ssize_t snd_compr_read(struct file *f, char __user *buf,
- size_t count, loff_t *offset)
- {
- struct snd_compr_file *data = f->private_data;
- struct snd_compr_stream *stream;
- size_t avail;
- int retval;
- if (snd_BUG_ON(!data))
- return -EFAULT;
- stream = &data->stream;
- mutex_lock(&stream->device->lock);
- /* read is allowed when stream is running */
- if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
- retval = -EBADFD;
- goto out;
- }
- avail = snd_compr_get_avail(stream);
- pr_debug("avail returned %ld\n", (unsigned long)avail);
- /* calculate how much we can read from buffer */
- if (avail > count)
- avail = count;
- if (stream->ops->copy) {
- retval = stream->ops->copy(stream, buf, avail);
- } else {
- retval = -ENXIO;
- goto out;
- }
- if (retval > 0)
- stream->runtime->total_bytes_transferred += retval;
- out:
- mutex_unlock(&stream->device->lock);
- return retval;
- }
- static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
- {
- return -ENXIO;
- }
- static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
- {
- if (stream->direction == SND_COMPRESS_PLAYBACK)
- return POLLOUT | POLLWRNORM;
- else
- return POLLIN | POLLRDNORM;
- }
- static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
- {
- struct snd_compr_file *data = f->private_data;
- struct snd_compr_stream *stream;
- size_t avail;
- int retval = 0;
- if (snd_BUG_ON(!data))
- return -EFAULT;
- stream = &data->stream;
- if (snd_BUG_ON(!stream))
- return -EFAULT;
- mutex_lock(&stream->device->lock);
- if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
- stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
- retval = -EBADFD;
- goto out;
- }
- poll_wait(f, &stream->runtime->sleep, wait);
- avail = snd_compr_get_avail(stream);
- pr_debug("avail is %ld\n", (unsigned long)avail);
- /* check if we have at least one fragment to fill */
- switch (stream->runtime->state) {
- case SNDRV_PCM_STATE_DRAINING:
- /* stream has been woken up after drain is complete
- * draining done so set stream state to stopped
- */
- retval = snd_compr_get_poll(stream);
- stream->runtime->state = SNDRV_PCM_STATE_SETUP;
- break;
- case SNDRV_PCM_STATE_RUNNING:
- case SNDRV_PCM_STATE_PREPARED:
- case SNDRV_PCM_STATE_PAUSED:
- if (avail >= stream->runtime->fragment_size)
- retval = snd_compr_get_poll(stream);
- break;
- default:
- if (stream->direction == SND_COMPRESS_PLAYBACK)
- retval = POLLOUT | POLLWRNORM | POLLERR;
- else
- retval = POLLIN | POLLRDNORM | POLLERR;
- break;
- }
- out:
- mutex_unlock(&stream->device->lock);
- return retval;
- }
- static int
- snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
- {
- int retval;
- struct snd_compr_caps caps;
- if (!stream->ops->get_caps)
- return -ENXIO;
- memset(&caps, 0, sizeof(caps));
- retval = stream->ops->get_caps(stream, &caps);
- if (retval)
- goto out;
- if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
- retval = -EFAULT;
- out:
- return retval;
- }
- static int
- snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
- {
- int retval;
- struct snd_compr_codec_caps *caps;
- if (!stream->ops->get_codec_caps)
- return -ENXIO;
- caps = kzalloc(sizeof(*caps), GFP_KERNEL);
- if (!caps)
- return -ENOMEM;
- retval = stream->ops->get_codec_caps(stream, caps);
- if (retval)
- goto out;
- if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
- retval = -EFAULT;
- out:
- kfree(caps);
- return retval;
- }
- /* revisit this with snd_pcm_preallocate_xxx */
- static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
- struct snd_compr_params *params)
- {
- unsigned int buffer_size;
- void *buffer;
- if (params->buffer.fragment_size == 0 ||
- params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
- return -EINVAL;
- buffer_size = params->buffer.fragment_size * params->buffer.fragments;
- if (stream->ops->copy) {
- buffer = NULL;
- /* if copy is defined the driver will be required to copy
- * the data from core
- */
- } else {
- buffer = kmalloc(buffer_size, GFP_KERNEL);
- if (!buffer)
- return -ENOMEM;
- }
- stream->runtime->fragment_size = params->buffer.fragment_size;
- stream->runtime->fragments = params->buffer.fragments;
- stream->runtime->buffer = buffer;
- stream->runtime->buffer_size = buffer_size;
- return 0;
- }
- static int snd_compress_check_input(struct snd_compr_params *params)
- {
- /* first let's check the buffer parameter's */
- if (params->buffer.fragment_size == 0 ||
- params->buffer.fragments > U32_MAX / params->buffer.fragment_size)
- return -EINVAL;
- /* now codec parameters */
- if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
- return -EINVAL;
- if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
- return -EINVAL;
- if (!(params->codec.sample_rate & SNDRV_PCM_RATE_8000_192000))
- return -EINVAL;
- return 0;
- }
- static int
- snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
- {
- struct snd_compr_params *params;
- int retval;
- if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
- /*
- * we should allow parameter change only when stream has been
- * opened not in other cases
- */
- params = kmalloc(sizeof(*params), GFP_KERNEL);
- if (!params)
- return -ENOMEM;
- if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
- retval = -EFAULT;
- goto out;
- }
- retval = snd_compress_check_input(params);
- if (retval)
- goto out;
- retval = snd_compr_allocate_buffer(stream, params);
- if (retval) {
- retval = -ENOMEM;
- goto out;
- }
- retval = stream->ops->set_params(stream, params);
- if (retval)
- goto out;
- stream->metadata_set = false;
- stream->next_track = false;
- if (stream->direction == SND_COMPRESS_PLAYBACK)
- stream->runtime->state = SNDRV_PCM_STATE_SETUP;
- else
- stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
- } else {
- return -EPERM;
- }
- out:
- kfree(params);
- return retval;
- }
- static int
- snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
- {
- struct snd_codec *params;
- int retval;
- if (!stream->ops->get_params)
- return -EBADFD;
- params = kzalloc(sizeof(*params), GFP_KERNEL);
- if (!params)
- return -ENOMEM;
- retval = stream->ops->get_params(stream, params);
- if (retval)
- goto out;
- if (copy_to_user((char __user *)arg, params, sizeof(*params)))
- retval = -EFAULT;
- out:
- kfree(params);
- return retval;
- }
- static int
- snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
- {
- struct snd_compr_metadata metadata;
- int retval;
- if (!stream->ops->get_metadata)
- return -ENXIO;
- if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
- return -EFAULT;
- retval = stream->ops->get_metadata(stream, &metadata);
- if (retval != 0)
- return retval;
- if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
- return -EFAULT;
- return 0;
- }
- static int
- snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
- {
- struct snd_compr_metadata metadata;
- int retval;
- if (!stream->ops->set_metadata)
- return -ENXIO;
- /*
- * we should allow parameter change only when stream has been
- * opened not in other cases
- */
- if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
- return -EFAULT;
- retval = stream->ops->set_metadata(stream, &metadata);
- stream->metadata_set = true;
- return retval;
- }
- static inline int
- snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
- {
- struct snd_compr_tstamp tstamp;
- int ret;
- memset(&tstamp, 0, sizeof(tstamp));
- ret = snd_compr_update_tstamp(stream, &tstamp);
- if (ret == 0)
- ret = copy_to_user((struct snd_compr_tstamp __user *)arg,
- &tstamp, sizeof(tstamp)) ? -EFAULT : 0;
- return ret;
- }
- static int snd_compr_pause(struct snd_compr_stream *stream)
- {
- int retval;
- if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
- return -EPERM;
- retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
- if (!retval)
- stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
- return retval;
- }
- static int snd_compr_resume(struct snd_compr_stream *stream)
- {
- int retval;
- if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
- return -EPERM;
- retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
- if (!retval)
- stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
- return retval;
- }
- static int snd_compr_start(struct snd_compr_stream *stream)
- {
- int retval;
- if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
- return -EPERM;
- retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
- if (!retval)
- stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
- return retval;
- }
- static int snd_compr_stop(struct snd_compr_stream *stream)
- {
- int retval;
- if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
- stream->runtime->state == SNDRV_PCM_STATE_SETUP)
- return -EPERM;
- retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
- if (!retval) {
- stream->runtime->state = SNDRV_PCM_STATE_SETUP;
- wake_up(&stream->runtime->sleep);
- stream->runtime->total_bytes_available = 0;
- stream->runtime->total_bytes_transferred = 0;
- }
- return retval;
- }
- /* this fn is called without lock being held and we change stream states here
- * so while using the stream state auquire the lock but relase before invoking
- * DSP as the call will possibly take a while
- */
- static int snd_compr_drain(struct snd_compr_stream *stream)
- {
- int retval;
- mutex_lock(&stream->device->lock);
- if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
- stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
- retval = -EPERM;
- goto ret;
- }
- mutex_unlock(&stream->device->lock);
- retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
- mutex_lock(&stream->device->lock);
- if (!retval) {
- stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
- wake_up(&stream->runtime->sleep);
- }
- ret:
- mutex_unlock(&stream->device->lock);
- return retval;
- }
- static int snd_compr_next_track(struct snd_compr_stream *stream)
- {
- int retval;
- /* only a running stream can transition to next track */
- if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
- return -EPERM;
- /* you can signal next track isf this is intended to be a gapless stream
- * and current track metadata is set
- */
- if (stream->metadata_set == false)
- return -EPERM;
- retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
- if (retval != 0)
- return retval;
- stream->metadata_set = false;
- stream->next_track = true;
- return 0;
- }
- static int snd_compr_partial_drain(struct snd_compr_stream *stream)
- {
- int retval;
- mutex_lock(&stream->device->lock);
- if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
- stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
- mutex_unlock(&stream->device->lock);
- return -EPERM;
- }
- mutex_unlock(&stream->device->lock);
- /* stream can be drained only when next track has been signalled */
- if (stream->next_track == false)
- return -EPERM;
- retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_PARTIAL_DRAIN);
- stream->next_track = false;
- return retval;
- }
- static int snd_compress_simple_ioctls(struct file *file,
- struct snd_compr_stream *stream,
- unsigned int cmd, unsigned long arg)
- {
- int retval = -ENOTTY;
- switch (_IOC_NR(cmd)) {
- case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
- retval = put_user(SNDRV_COMPRESS_VERSION,
- (int __user *)arg) ? -EFAULT : 0;
- break;
- case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
- retval = snd_compr_get_caps(stream, arg);
- break;
- case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
- retval = snd_compr_get_codec_caps(stream, arg);
- break;
- case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
- retval = snd_compr_tstamp(stream, arg);
- break;
- case _IOC_NR(SNDRV_COMPRESS_AVAIL):
- retval = snd_compr_ioctl_avail(stream, arg);
- break;
- /* drain and partial drain need special handling
- * we need to drop the locks here as the streams would get blocked on the
- * dsp to get drained. The locking would be handled in respective
- * function here
- */
- case _IOC_NR(SNDRV_COMPRESS_DRAIN):
- retval = snd_compr_drain(stream);
- break;
- case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
- retval = snd_compr_partial_drain(stream);
- break;
- }
- return retval;
- }
- static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
- {
- struct snd_compr_file *data = f->private_data;
- struct snd_compr_stream *stream;
- int retval = -ENOTTY;
- if (snd_BUG_ON(!data))
- return -EFAULT;
- stream = &data->stream;
- if (snd_BUG_ON(!stream))
- return -EFAULT;
- mutex_lock(&stream->device->lock);
- switch (_IOC_NR(cmd)) {
- case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
- retval = snd_compr_set_params(stream, arg);
- break;
- case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
- retval = snd_compr_get_params(stream, arg);
- break;
- case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
- retval = snd_compr_set_metadata(stream, arg);
- break;
- case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
- retval = snd_compr_get_metadata(stream, arg);
- break;
- case _IOC_NR(SNDRV_COMPRESS_PAUSE):
- retval = snd_compr_pause(stream);
- break;
- case _IOC_NR(SNDRV_COMPRESS_RESUME):
- retval = snd_compr_resume(stream);
- break;
- case _IOC_NR(SNDRV_COMPRESS_START):
- retval = snd_compr_start(stream);
- break;
- case _IOC_NR(SNDRV_COMPRESS_STOP):
- retval = snd_compr_stop(stream);
- break;
- case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
- retval = snd_compr_next_track(stream);
- break;
- default:
- mutex_unlock(&stream->device->lock);
- return snd_compress_simple_ioctls(f, stream, cmd, arg);
- }
- mutex_unlock(&stream->device->lock);
- return retval;
- }
- static const struct file_operations snd_compr_file_ops = {
- .owner = THIS_MODULE,
- .open = snd_compr_open,
- .release = snd_compr_free,
- .write = snd_compr_write,
- .read = snd_compr_read,
- .unlocked_ioctl = snd_compr_ioctl,
- .mmap = snd_compr_mmap,
- .poll = snd_compr_poll,
- };
- static int snd_compress_dev_register(struct snd_device *device)
- {
- int ret = -EINVAL;
- char str[16];
- struct snd_compr *compr;
- if (snd_BUG_ON(!device || !device->device_data))
- return -EBADFD;
- compr = device->device_data;
- sprintf(str, "comprC%iD%i", compr->card->number, compr->device);
- pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
- compr->direction);
- /* register compressed device */
- ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
- compr->device, &snd_compr_file_ops, compr, str);
- if (ret < 0) {
- pr_err("snd_register_device failed\n %d", ret);
- return ret;
- }
- return ret;
- }
- static int snd_compress_dev_disconnect(struct snd_device *device)
- {
- struct snd_compr *compr;
- compr = device->device_data;
- snd_unregister_device(SNDRV_DEVICE_TYPE_COMPRESS, compr->card,
- compr->device);
- return 0;
- }
- /*
- * snd_compress_new: create new compress device
- * @card: sound card pointer
- * @device: device number
- * @dirn: device direction, should be of type enum snd_compr_direction
- * @compr: compress device pointer
- */
- int snd_compress_new(struct snd_card *card, int device,
- int dirn, struct snd_compr *compr)
- {
- static struct snd_device_ops ops = {
- .dev_free = NULL,
- .dev_register = snd_compress_dev_register,
- .dev_disconnect = snd_compress_dev_disconnect,
- };
- compr->card = card;
- compr->device = device;
- compr->direction = dirn;
- return snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
- }
- EXPORT_SYMBOL_GPL(snd_compress_new);
- /*
- * snd_compress_free: free compress device
- * @card: sound card pointer
- * @compr: compress device pointer
- */
- void snd_compress_free(struct snd_card *card, struct snd_compr *compr)
- {
- snd_device_free(card, compr);
- }
- EXPORT_SYMBOL_GPL(snd_compress_free);
- static int snd_compress_add_device(struct snd_compr *device)
- {
- int ret;
- if (!device->card)
- return -EINVAL;
- /* register the card */
- ret = snd_card_register(device->card);
- if (ret)
- goto out;
- return 0;
- out:
- pr_err("failed with %d\n", ret);
- return ret;
- }
- static int snd_compress_remove_device(struct snd_compr *device)
- {
- return snd_card_free(device->card);
- }
- /**
- * snd_compress_register - register compressed device
- *
- * @device: compressed device to register
- */
- int snd_compress_register(struct snd_compr *device)
- {
- int retval;
- if (device->name == NULL || device->dev == NULL || device->ops == NULL)
- return -EINVAL;
- pr_debug("Registering compressed device %s\n", device->name);
- if (snd_BUG_ON(!device->ops->open))
- return -EINVAL;
- if (snd_BUG_ON(!device->ops->free))
- return -EINVAL;
- if (snd_BUG_ON(!device->ops->set_params))
- return -EINVAL;
- if (snd_BUG_ON(!device->ops->trigger))
- return -EINVAL;
- mutex_init(&device->lock);
- /* register a compressed card */
- mutex_lock(&device_mutex);
- retval = snd_compress_add_device(device);
- mutex_unlock(&device_mutex);
- return retval;
- }
- EXPORT_SYMBOL_GPL(snd_compress_register);
- int snd_compress_deregister(struct snd_compr *device)
- {
- pr_debug("Removing compressed device %s\n", device->name);
- mutex_lock(&device_mutex);
- snd_compress_remove_device(device);
- mutex_unlock(&device_mutex);
- return 0;
- }
- EXPORT_SYMBOL_GPL(snd_compress_deregister);
- static int __init snd_compress_init(void)
- {
- return 0;
- }
- static void __exit snd_compress_exit(void)
- {
- }
- module_init(snd_compress_init);
- module_exit(snd_compress_exit);
- MODULE_DESCRIPTION("ALSA Compressed offload framework");
- MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
- MODULE_LICENSE("GPL v2");
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