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ALSA: core: add support for compress_offload
This patch adds core.c, the file which implements the ioctls and registers the devices Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Vinod Koul
Takashi Iwai
parent
e60061a379
commit
b21c60a4ed
765
sound/core/compress_offload.c
Normal file
765
sound/core/compress_offload.c
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@ -0,0 +1,765 @@
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/*
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* compress_core.c - compress offload core
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*
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* Copyright (C) 2011 Intel Corporation
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* Authors: Vinod Koul <vinod.koul@linux.intel.com>
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* Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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*/
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#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
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#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/mm.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/uio.h>
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#include <linux/uaccess.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/compress_params.h>
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#include <sound/compress_offload.h>
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#include <sound/compress_driver.h>
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/* TODO:
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* - add substream support for multiple devices in case of
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* SND_DYNAMIC_MINORS is not used
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* - Multiple node representation
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* driver should be able to register multiple nodes
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*/
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static DEFINE_MUTEX(device_mutex);
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struct snd_compr_file {
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unsigned long caps;
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struct snd_compr_stream stream;
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};
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/*
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* a note on stream states used:
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* we use follwing states in the compressed core
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* SNDRV_PCM_STATE_OPEN: When stream has been opened.
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* SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
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* calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
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* state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
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* SNDRV_PCM_STATE_RUNNING: When stream has been started and is
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* decoding/encoding and rendering/capturing data.
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* SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
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* by calling SNDRV_COMPRESS_DRAIN.
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* SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
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* SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
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* SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
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*/
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static int snd_compr_open(struct inode *inode, struct file *f)
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{
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struct snd_compr *compr;
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struct snd_compr_file *data;
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struct snd_compr_runtime *runtime;
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enum snd_compr_direction dirn;
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int maj = imajor(inode);
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int ret;
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if (f->f_flags & O_WRONLY)
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dirn = SND_COMPRESS_PLAYBACK;
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else if (f->f_flags & O_RDONLY)
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dirn = SND_COMPRESS_CAPTURE;
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else {
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pr_err("invalid direction\n");
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return -EINVAL;
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}
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if (maj == snd_major)
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compr = snd_lookup_minor_data(iminor(inode),
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SNDRV_DEVICE_TYPE_COMPRESS);
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else
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return -EBADFD;
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if (compr == NULL) {
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pr_err("no device data!!!\n");
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return -ENODEV;
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}
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if (dirn != compr->direction) {
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pr_err("this device doesn't support this direction\n");
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return -EINVAL;
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}
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->stream.ops = compr->ops;
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data->stream.direction = dirn;
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data->stream.private_data = compr->private_data;
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data->stream.device = compr;
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runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
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if (!runtime) {
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kfree(data);
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return -ENOMEM;
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}
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runtime->state = SNDRV_PCM_STATE_OPEN;
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init_waitqueue_head(&runtime->sleep);
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data->stream.runtime = runtime;
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f->private_data = (void *)data;
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mutex_lock(&compr->lock);
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ret = compr->ops->open(&data->stream);
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mutex_unlock(&compr->lock);
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if (ret) {
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kfree(runtime);
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kfree(data);
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}
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return ret;
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}
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static int snd_compr_free(struct inode *inode, struct file *f)
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{
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struct snd_compr_file *data = f->private_data;
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data->stream.ops->free(&data->stream);
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kfree(data->stream.runtime->buffer);
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kfree(data->stream.runtime);
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kfree(data);
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return 0;
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}
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static void snd_compr_update_tstamp(struct snd_compr_stream *stream,
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struct snd_compr_tstamp *tstamp)
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{
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if (!stream->ops->pointer)
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return;
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stream->ops->pointer(stream, tstamp);
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pr_debug("dsp consumed till %d total %d bytes\n",
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tstamp->byte_offset, tstamp->copied_total);
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stream->runtime->hw_pointer = tstamp->byte_offset;
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stream->runtime->total_bytes_transferred = tstamp->copied_total;
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}
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static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
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struct snd_compr_avail *avail)
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{
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long avail_calc; /*this needs to be signed variable */
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snd_compr_update_tstamp(stream, &avail->tstamp);
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/* FIXME: This needs to be different for capture stream,
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available is # of compressed data, for playback it's
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remainder of buffer */
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if (stream->runtime->total_bytes_available == 0 &&
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stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
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pr_debug("detected init and someone forgot to do a write\n");
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return stream->runtime->buffer_size;
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}
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pr_debug("app wrote %lld, DSP consumed %lld\n",
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stream->runtime->total_bytes_available,
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stream->runtime->total_bytes_transferred);
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if (stream->runtime->total_bytes_available ==
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stream->runtime->total_bytes_transferred) {
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pr_debug("both pointers are same, returning full avail\n");
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return stream->runtime->buffer_size;
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}
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/* FIXME: this routine isn't consistent, in one test we use
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* cumulative values and in the other byte offsets. Do we
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* really need the byte offsets if the cumulative values have
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* been updated? In the PCM interface app_ptr and hw_ptr are
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* already cumulative */
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avail_calc = stream->runtime->buffer_size -
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(stream->runtime->app_pointer - stream->runtime->hw_pointer);
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pr_debug("calc avail as %ld, app_ptr %lld, hw+ptr %lld\n", avail_calc,
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stream->runtime->app_pointer,
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stream->runtime->hw_pointer);
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if (avail_calc >= stream->runtime->buffer_size)
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avail_calc -= stream->runtime->buffer_size;
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pr_debug("ret avail as %ld\n", avail_calc);
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avail->avail = avail_calc;
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return avail_calc;
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}
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static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
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{
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struct snd_compr_avail avail;
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return snd_compr_calc_avail(stream, &avail);
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}
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static int
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snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
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{
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struct snd_compr_avail ioctl_avail;
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size_t avail;
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avail = snd_compr_calc_avail(stream, &ioctl_avail);
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ioctl_avail.avail = avail;
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if (copy_to_user((__u64 __user *)arg,
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&ioctl_avail, sizeof(ioctl_avail)))
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return -EFAULT;
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return 0;
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}
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static int snd_compr_write_data(struct snd_compr_stream *stream,
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const char __user *buf, size_t count)
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{
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void *dstn;
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size_t copy;
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struct snd_compr_runtime *runtime = stream->runtime;
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dstn = runtime->buffer + runtime->app_pointer;
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pr_debug("copying %ld at %lld\n",
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(unsigned long)count, runtime->app_pointer);
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if (count < runtime->buffer_size - runtime->app_pointer) {
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if (copy_from_user(dstn, buf, count))
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return -EFAULT;
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runtime->app_pointer += count;
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} else {
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copy = runtime->buffer_size - runtime->app_pointer;
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if (copy_from_user(dstn, buf, copy))
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return -EFAULT;
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if (copy_from_user(runtime->buffer, buf + copy, count - copy))
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return -EFAULT;
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runtime->app_pointer = count - copy;
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}
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/* if DSP cares, let it know data has been written */
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if (stream->ops->ack)
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stream->ops->ack(stream, count);
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return count;
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}
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static ssize_t snd_compr_write(struct file *f, const char __user *buf,
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size_t count, loff_t *offset)
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{
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struct snd_compr_file *data = f->private_data;
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struct snd_compr_stream *stream;
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size_t avail;
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int retval;
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if (snd_BUG_ON(!data))
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return -EFAULT;
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stream = &data->stream;
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mutex_lock(&stream->device->lock);
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/* write is allowed when stream is running or has been steup */
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if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
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stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
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mutex_unlock(&stream->device->lock);
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return -EBADFD;
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}
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avail = snd_compr_get_avail(stream);
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pr_debug("avail returned %ld\n", (unsigned long)avail);
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/* calculate how much we can write to buffer */
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if (avail > count)
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avail = count;
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if (stream->ops->copy)
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retval = stream->ops->copy(stream, buf, avail);
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else
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retval = snd_compr_write_data(stream, buf, avail);
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if (retval > 0)
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stream->runtime->total_bytes_available += retval;
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/* while initiating the stream, write should be called before START
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* call, so in setup move state */
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if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
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stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
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pr_debug("stream prepared, Houston we are good to go\n");
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}
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mutex_unlock(&stream->device->lock);
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return retval;
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}
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static ssize_t snd_compr_read(struct file *f, char __user *buf,
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size_t count, loff_t *offset)
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{
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return -ENXIO;
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}
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static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
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{
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return -ENXIO;
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}
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static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
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{
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if (stream->direction == SND_COMPRESS_PLAYBACK)
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return POLLOUT | POLLWRNORM;
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else
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return POLLIN | POLLRDNORM;
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}
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static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
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{
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struct snd_compr_file *data = f->private_data;
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struct snd_compr_stream *stream;
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size_t avail;
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int retval = 0;
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if (snd_BUG_ON(!data))
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return -EFAULT;
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stream = &data->stream;
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if (snd_BUG_ON(!stream))
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return -EFAULT;
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mutex_lock(&stream->device->lock);
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if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED ||
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stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
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retval = -EBADFD;
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goto out;
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}
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poll_wait(f, &stream->runtime->sleep, wait);
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avail = snd_compr_get_avail(stream);
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pr_debug("avail is %ld\n", (unsigned long)avail);
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/* check if we have at least one fragment to fill */
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switch (stream->runtime->state) {
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case SNDRV_PCM_STATE_DRAINING:
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/* stream has been woken up after drain is complete
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* draining done so set stream state to stopped
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*/
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retval = snd_compr_get_poll(stream);
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stream->runtime->state = SNDRV_PCM_STATE_SETUP;
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break;
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case SNDRV_PCM_STATE_RUNNING:
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case SNDRV_PCM_STATE_PREPARED:
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case SNDRV_PCM_STATE_PAUSED:
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if (avail >= stream->runtime->fragment_size)
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retval = snd_compr_get_poll(stream);
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break;
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default:
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if (stream->direction == SND_COMPRESS_PLAYBACK)
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retval = POLLOUT | POLLWRNORM | POLLERR;
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else
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retval = POLLIN | POLLRDNORM | POLLERR;
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break;
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}
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out:
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mutex_unlock(&stream->device->lock);
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return retval;
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}
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static int
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snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
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{
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int retval;
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struct snd_compr_caps caps;
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if (!stream->ops->get_caps)
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return -ENXIO;
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retval = stream->ops->get_caps(stream, &caps);
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if (retval)
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goto out;
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if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
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retval = -EFAULT;
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out:
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return retval;
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}
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static int
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snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
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{
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int retval;
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struct snd_compr_codec_caps *caps;
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if (!stream->ops->get_codec_caps)
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return -ENXIO;
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caps = kmalloc(sizeof(*caps), GFP_KERNEL);
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if (!caps)
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return -ENOMEM;
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retval = stream->ops->get_codec_caps(stream, caps);
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if (retval)
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goto out;
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if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
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retval = -EFAULT;
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out:
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kfree(caps);
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return retval;
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}
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|
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/* revisit this with snd_pcm_preallocate_xxx */
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static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
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struct snd_compr_params *params)
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{
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unsigned int buffer_size;
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void *buffer;
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buffer_size = params->buffer.fragment_size * params->buffer.fragments;
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if (stream->ops->copy) {
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buffer = NULL;
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/* if copy is defined the driver will be required to copy
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* the data from core
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*/
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} else {
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buffer = kmalloc(buffer_size, GFP_KERNEL);
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if (!buffer)
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return -ENOMEM;
|
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}
|
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stream->runtime->fragment_size = params->buffer.fragment_size;
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stream->runtime->fragments = params->buffer.fragments;
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stream->runtime->buffer = buffer;
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stream->runtime->buffer_size = buffer_size;
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return 0;
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}
|
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|
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static int
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snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
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{
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struct snd_compr_params *params;
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int retval;
|
||||
|
||||
if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
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/*
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* we should allow parameter change only when stream has been
|
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* opened not in other cases
|
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*/
|
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params = kmalloc(sizeof(*params), GFP_KERNEL);
|
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if (!params)
|
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return -ENOMEM;
|
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if (copy_from_user(params, (void __user *)arg, sizeof(*params)))
|
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return -EFAULT;
|
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retval = snd_compr_allocate_buffer(stream, params);
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if (retval) {
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kfree(params);
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return -ENOMEM;
|
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}
|
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retval = stream->ops->set_params(stream, params);
|
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if (retval)
|
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goto out;
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stream->runtime->state = SNDRV_PCM_STATE_SETUP;
|
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} else
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return -EPERM;
|
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out:
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kfree(params);
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return retval;
|
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}
|
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|
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static int
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snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
|
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{
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struct snd_codec *params;
|
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int retval;
|
||||
|
||||
if (!stream->ops->get_params)
|
||||
return -EBADFD;
|
||||
|
||||
params = kmalloc(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 inline int
|
||||
snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
|
||||
{
|
||||
struct snd_compr_tstamp tstamp;
|
||||
|
||||
snd_compr_update_tstamp(stream, &tstamp);
|
||||
return copy_to_user((struct snd_compr_tstamp __user *)arg,
|
||||
&tstamp, sizeof(tstamp)) ? -EFAULT : 0;
|
||||
}
|
||||
|
||||
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;
|
||||
wake_up(&stream->runtime->sleep);
|
||||
}
|
||||
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);
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
|
||||
static int snd_compr_drain(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, SND_COMPR_TRIGGER_DRAIN);
|
||||
if (!retval) {
|
||||
stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
|
||||
wake_up(&stream->runtime->sleep);
|
||||
}
|
||||
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_IOCTL_VERSION):
|
||||
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_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_TSTAMP):
|
||||
retval = snd_compr_tstamp(stream, arg);
|
||||
break;
|
||||
case _IOC_NR(SNDRV_COMPRESS_AVAIL):
|
||||
retval = snd_compr_ioctl_avail(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_DRAIN):
|
||||
retval = snd_compr_drain(stream);
|
||||
break;
|
||||
}
|
||||
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(compr->direction, 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);
|
||||
|
||||
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");
|
||||
Loading…
x
Reference in New Issue
Block a user