1195 lines
30 KiB
C
1195 lines
30 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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/math64.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/types.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 <linux/compat.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/info.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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/* struct snd_compr_codec_caps overflows the ioctl bit size for some
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* architectures, so we need to disable the relevant ioctls.
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*/
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#if _IOC_SIZEBITS < 14
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#define COMPR_CODEC_CAPS_OVERFLOW
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#endif
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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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static void error_delayed_work(struct work_struct *work);
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/*
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* a note on stream states used:
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* we use following 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_PREPARED: When a stream has been written to (for
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* playback only). User after setting up stream writes the data buffer
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* before starting the stream.
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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_ACCMODE) == O_WRONLY)
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dirn = SND_COMPRESS_PLAYBACK;
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else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
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dirn = SND_COMPRESS_CAPTURE;
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else
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return -EINVAL;
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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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snd_card_unref(compr->card);
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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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snd_card_unref(compr->card);
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return -ENOMEM;
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}
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INIT_DELAYED_WORK(&data->stream.error_work, error_delayed_work);
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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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snd_card_unref(compr->card);
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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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snd_card_unref(compr->card);
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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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struct snd_compr_runtime *runtime = data->stream.runtime;
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cancel_delayed_work_sync(&data->stream.error_work);
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switch (runtime->state) {
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case SNDRV_PCM_STATE_RUNNING:
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case SNDRV_PCM_STATE_DRAINING:
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case SNDRV_PCM_STATE_PAUSED:
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data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
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break;
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default:
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break;
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}
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data->stream.ops->free(&data->stream);
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if (!data->stream.runtime->dma_buffer_p)
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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 int 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 -ENOTSUPP;
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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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if (stream->direction == SND_COMPRESS_PLAYBACK)
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stream->runtime->total_bytes_transferred = tstamp->copied_total;
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else
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stream->runtime->total_bytes_available = tstamp->copied_total;
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return 0;
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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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memset(avail, 0, sizeof(*avail));
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snd_compr_update_tstamp(stream, &avail->tstamp);
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/* Still need to return avail even if tstamp can't be filled in */
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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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stream->direction == SND_COMPRESS_PLAYBACK) {
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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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if (stream->direction == SND_COMPRESS_PLAYBACK) {
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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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} else {
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pr_debug("both pointers are same, returning no avail\n");
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return 0;
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}
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}
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avail->avail = stream->runtime->total_bytes_available -
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stream->runtime->total_bytes_transferred;
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if (stream->direction == SND_COMPRESS_PLAYBACK)
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avail->avail = stream->runtime->buffer_size - avail->avail;
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pr_debug("ret avail as %lld\n", avail->avail);
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return avail->avail;
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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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switch (stream->runtime->state) {
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case SNDRV_PCM_STATE_OPEN:
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return -EBADFD;
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case SNDRV_PCM_STATE_XRUN:
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return -EPIPE;
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default:
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break;
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}
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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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/* 64-bit Modulus */
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u64 app_pointer = div64_u64(runtime->total_bytes_available,
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runtime->buffer_size);
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app_pointer = runtime->total_bytes_available -
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(app_pointer * runtime->buffer_size);
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dstn = runtime->buffer + app_pointer;
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pr_debug("copying %ld at %lld\n",
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(unsigned long)count, app_pointer);
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if (count < runtime->buffer_size - app_pointer) {
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if (copy_from_user(dstn, buf, count))
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return -EFAULT;
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} else {
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copy = runtime->buffer_size - 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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}
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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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switch (stream->runtime->state) {
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case SNDRV_PCM_STATE_SETUP:
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case SNDRV_PCM_STATE_PREPARED:
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case SNDRV_PCM_STATE_RUNNING:
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break;
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default:
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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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char __user* cbuf = (char __user*)buf;
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retval = stream->ops->copy(stream, cbuf, avail);
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} else {
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retval = snd_compr_write_data(stream, buf, avail);
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}
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if (retval > 0)
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stream->runtime->total_bytes_available += retval;
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|
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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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|
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mutex_unlock(&stream->device->lock);
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return retval;
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}
|
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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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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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|
|
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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);
|
||
|
|
||
|
/* read is allowed when stream is running, paused, draining and setup
|
||
|
* (yes setup is state which we transition to after stop, so if user
|
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|
* wants to read data after stop we allow that)
|
||
|
*/
|
||
|
switch (stream->runtime->state) {
|
||
|
case SNDRV_PCM_STATE_OPEN:
|
||
|
case SNDRV_PCM_STATE_PREPARED:
|
||
|
case SNDRV_PCM_STATE_SUSPENDED:
|
||
|
case SNDRV_PCM_STATE_DISCONNECTED:
|
||
|
retval = -EBADFD;
|
||
|
goto out;
|
||
|
case SNDRV_PCM_STATE_XRUN:
|
||
|
retval = -EPIPE;
|
||
|
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 __poll_t snd_compr_get_poll(struct snd_compr_stream *stream)
|
||
|
{
|
||
|
if (stream->direction == SND_COMPRESS_PLAYBACK)
|
||
|
return EPOLLOUT | EPOLLWRNORM;
|
||
|
else
|
||
|
return EPOLLIN | EPOLLRDNORM;
|
||
|
}
|
||
|
|
||
|
static __poll_t 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;
|
||
|
__poll_t retval = 0;
|
||
|
|
||
|
if (snd_BUG_ON(!data))
|
||
|
return EPOLLERR;
|
||
|
|
||
|
stream = &data->stream;
|
||
|
|
||
|
mutex_lock(&stream->device->lock);
|
||
|
|
||
|
switch (stream->runtime->state) {
|
||
|
case SNDRV_PCM_STATE_OPEN:
|
||
|
case SNDRV_PCM_STATE_XRUN:
|
||
|
retval = snd_compr_get_poll(stream) | EPOLLERR;
|
||
|
goto out;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
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:
|
||
|
retval = snd_compr_get_poll(stream) | EPOLLERR;
|
||
|
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;
|
||
|
}
|
||
|
|
||
|
#ifndef COMPR_CODEC_CAPS_OVERFLOW
|
||
|
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;
|
||
|
}
|
||
|
#endif /* !COMPR_CODEC_CAPS_OVERFLOW */
|
||
|
|
||
|
/* 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 = NULL;
|
||
|
|
||
|
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 {
|
||
|
if (stream->runtime->dma_buffer_p) {
|
||
|
|
||
|
if (buffer_size > stream->runtime->dma_buffer_p->bytes)
|
||
|
dev_err(&stream->device->dev,
|
||
|
"Not enough DMA buffer");
|
||
|
else
|
||
|
buffer = stream->runtime->dma_buffer_p->area;
|
||
|
|
||
|
} 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 ||
|
||
|
params->buffer.fragments == 0)
|
||
|
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;
|
||
|
|
||
|
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 = memdup_user((void __user *)arg, sizeof(*params));
|
||
|
if (IS_ERR(params))
|
||
|
return PTR_ERR(params);
|
||
|
|
||
|
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;
|
||
|
|
||
|
stream->runtime->state = SNDRV_PCM_STATE_SETUP;
|
||
|
} 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 = {0};
|
||
|
int ret;
|
||
|
|
||
|
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;
|
||
|
|
||
|
switch (stream->runtime->state) {
|
||
|
case SNDRV_PCM_STATE_SETUP:
|
||
|
if (stream->direction != SND_COMPRESS_CAPTURE)
|
||
|
return -EPERM;
|
||
|
break;
|
||
|
case SNDRV_PCM_STATE_PREPARED:
|
||
|
break;
|
||
|
default:
|
||
|
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;
|
||
|
|
||
|
switch (stream->runtime->state) {
|
||
|
case SNDRV_PCM_STATE_OPEN:
|
||
|
case SNDRV_PCM_STATE_SETUP:
|
||
|
case SNDRV_PCM_STATE_PREPARED:
|
||
|
return -EPERM;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
|
||
|
if (!retval) {
|
||
|
snd_compr_drain_notify(stream);
|
||
|
stream->runtime->total_bytes_available = 0;
|
||
|
stream->runtime->total_bytes_transferred = 0;
|
||
|
}
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static void error_delayed_work(struct work_struct *work)
|
||
|
{
|
||
|
struct snd_compr_stream *stream;
|
||
|
|
||
|
stream = container_of(work, struct snd_compr_stream, error_work.work);
|
||
|
|
||
|
mutex_lock(&stream->device->lock);
|
||
|
|
||
|
stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
|
||
|
wake_up(&stream->runtime->sleep);
|
||
|
|
||
|
mutex_unlock(&stream->device->lock);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* snd_compr_stop_error: Report a fatal error on a stream
|
||
|
* @stream: pointer to stream
|
||
|
* @state: state to transition the stream to
|
||
|
*
|
||
|
* Stop the stream and set its state.
|
||
|
*
|
||
|
* Should be called with compressed device lock held.
|
||
|
*/
|
||
|
int snd_compr_stop_error(struct snd_compr_stream *stream,
|
||
|
snd_pcm_state_t state)
|
||
|
{
|
||
|
if (stream->runtime->state == state)
|
||
|
return 0;
|
||
|
|
||
|
stream->runtime->state = state;
|
||
|
|
||
|
pr_debug("Changing state to: %d\n", state);
|
||
|
|
||
|
queue_delayed_work(system_power_efficient_wq, &stream->error_work, 0);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL_GPL(snd_compr_stop_error);
|
||
|
|
||
|
static int snd_compress_wait_for_drain(struct snd_compr_stream *stream)
|
||
|
{
|
||
|
int ret;
|
||
|
|
||
|
/*
|
||
|
* We are called with lock held. So drop the lock while we wait for
|
||
|
* drain complete notification from the driver
|
||
|
*
|
||
|
* It is expected that driver will notify the drain completion and then
|
||
|
* stream will be moved to SETUP state, even if draining resulted in an
|
||
|
* error. We can trigger next track after this.
|
||
|
*/
|
||
|
stream->runtime->state = SNDRV_PCM_STATE_DRAINING;
|
||
|
mutex_unlock(&stream->device->lock);
|
||
|
|
||
|
/* we wait for drain to complete here, drain can return when
|
||
|
* interruption occurred, wait returned error or success.
|
||
|
* For the first two cases we don't do anything different here and
|
||
|
* return after waking up
|
||
|
*/
|
||
|
|
||
|
ret = wait_event_interruptible(stream->runtime->sleep,
|
||
|
(stream->runtime->state != SNDRV_PCM_STATE_DRAINING));
|
||
|
if (ret == -ERESTARTSYS)
|
||
|
pr_debug("wait aborted by a signal\n");
|
||
|
else if (ret)
|
||
|
pr_debug("wait for drain failed with %d\n", ret);
|
||
|
|
||
|
|
||
|
wake_up(&stream->runtime->sleep);
|
||
|
mutex_lock(&stream->device->lock);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int snd_compr_drain(struct snd_compr_stream *stream)
|
||
|
{
|
||
|
int retval;
|
||
|
|
||
|
switch (stream->runtime->state) {
|
||
|
case SNDRV_PCM_STATE_OPEN:
|
||
|
case SNDRV_PCM_STATE_SETUP:
|
||
|
case SNDRV_PCM_STATE_PREPARED:
|
||
|
case SNDRV_PCM_STATE_PAUSED:
|
||
|
return -EPERM;
|
||
|
case SNDRV_PCM_STATE_XRUN:
|
||
|
return -EPIPE;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
|
||
|
if (retval) {
|
||
|
pr_debug("SND_COMPR_TRIGGER_DRAIN failed %d\n", retval);
|
||
|
wake_up(&stream->runtime->sleep);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
return snd_compress_wait_for_drain(stream);
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
|
||
|
/* next track doesn't have any meaning for capture streams */
|
||
|
if (stream->direction == SND_COMPRESS_CAPTURE)
|
||
|
return -EPERM;
|
||
|
|
||
|
/* you can signal next track if 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;
|
||
|
|
||
|
switch (stream->runtime->state) {
|
||
|
case SNDRV_PCM_STATE_OPEN:
|
||
|
case SNDRV_PCM_STATE_SETUP:
|
||
|
case SNDRV_PCM_STATE_PREPARED:
|
||
|
case SNDRV_PCM_STATE_PAUSED:
|
||
|
return -EPERM;
|
||
|
case SNDRV_PCM_STATE_XRUN:
|
||
|
return -EPIPE;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* partial drain doesn't have any meaning for capture streams */
|
||
|
if (stream->direction == SND_COMPRESS_CAPTURE)
|
||
|
return -EPERM;
|
||
|
|
||
|
/* 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);
|
||
|
if (retval) {
|
||
|
pr_debug("Partial drain returned failure\n");
|
||
|
wake_up(&stream->runtime->sleep);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
stream->next_track = false;
|
||
|
return snd_compress_wait_for_drain(stream);
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
|
||
|
mutex_lock(&stream->device->lock);
|
||
|
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;
|
||
|
#ifndef COMPR_CODEC_CAPS_OVERFLOW
|
||
|
case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
|
||
|
retval = snd_compr_get_codec_caps(stream, arg);
|
||
|
break;
|
||
|
#endif
|
||
|
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_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;
|
||
|
case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
|
||
|
retval = snd_compr_partial_drain(stream);
|
||
|
break;
|
||
|
case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
|
||
|
retval = snd_compr_next_track(stream);
|
||
|
break;
|
||
|
|
||
|
}
|
||
|
mutex_unlock(&stream->device->lock);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
/* support of 32bit userspace on 64bit platforms */
|
||
|
#ifdef CONFIG_COMPAT
|
||
|
static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd,
|
||
|
unsigned long arg)
|
||
|
{
|
||
|
return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
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,
|
||
|
#ifdef CONFIG_COMPAT
|
||
|
.compat_ioctl = snd_compr_ioctl_compat,
|
||
|
#endif
|
||
|
.mmap = snd_compr_mmap,
|
||
|
.poll = snd_compr_poll,
|
||
|
};
|
||
|
|
||
|
static int snd_compress_dev_register(struct snd_device *device)
|
||
|
{
|
||
|
int ret = -EINVAL;
|
||
|
struct snd_compr *compr;
|
||
|
|
||
|
if (snd_BUG_ON(!device || !device->device_data))
|
||
|
return -EBADFD;
|
||
|
compr = device->device_data;
|
||
|
|
||
|
pr_debug("reg device %s, direction %d\n", compr->name,
|
||
|
compr->direction);
|
||
|
/* register compressed device */
|
||
|
ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
|
||
|
compr->card, compr->device,
|
||
|
&snd_compr_file_ops, compr, &compr->dev);
|
||
|
if (ret < 0) {
|
||
|
pr_err("snd_register_device failed %d\n", 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->dev);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#ifdef CONFIG_SND_VERBOSE_PROCFS
|
||
|
static void snd_compress_proc_info_read(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_compr *compr = (struct snd_compr *)entry->private_data;
|
||
|
|
||
|
snd_iprintf(buffer, "card: %d\n", compr->card->number);
|
||
|
snd_iprintf(buffer, "device: %d\n", compr->device);
|
||
|
snd_iprintf(buffer, "stream: %s\n",
|
||
|
compr->direction == SND_COMPRESS_PLAYBACK
|
||
|
? "PLAYBACK" : "CAPTURE");
|
||
|
snd_iprintf(buffer, "id: %s\n", compr->id);
|
||
|
}
|
||
|
|
||
|
static int snd_compress_proc_init(struct snd_compr *compr)
|
||
|
{
|
||
|
struct snd_info_entry *entry;
|
||
|
char name[16];
|
||
|
|
||
|
sprintf(name, "compr%i", compr->device);
|
||
|
entry = snd_info_create_card_entry(compr->card, name,
|
||
|
compr->card->proc_root);
|
||
|
if (!entry)
|
||
|
return -ENOMEM;
|
||
|
entry->mode = S_IFDIR | 0555;
|
||
|
compr->proc_root = entry;
|
||
|
|
||
|
entry = snd_info_create_card_entry(compr->card, "info",
|
||
|
compr->proc_root);
|
||
|
if (entry)
|
||
|
snd_info_set_text_ops(entry, compr,
|
||
|
snd_compress_proc_info_read);
|
||
|
compr->proc_info_entry = entry;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void snd_compress_proc_done(struct snd_compr *compr)
|
||
|
{
|
||
|
snd_info_free_entry(compr->proc_info_entry);
|
||
|
compr->proc_info_entry = NULL;
|
||
|
snd_info_free_entry(compr->proc_root);
|
||
|
compr->proc_root = NULL;
|
||
|
}
|
||
|
|
||
|
static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
|
||
|
{
|
||
|
strlcpy(compr->id, id, sizeof(compr->id));
|
||
|
}
|
||
|
#else
|
||
|
static inline int snd_compress_proc_init(struct snd_compr *compr)
|
||
|
{
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static inline void snd_compress_proc_done(struct snd_compr *compr)
|
||
|
{
|
||
|
}
|
||
|
|
||
|
static inline void snd_compress_set_id(struct snd_compr *compr, const char *id)
|
||
|
{
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
static int snd_compress_dev_free(struct snd_device *device)
|
||
|
{
|
||
|
struct snd_compr *compr;
|
||
|
|
||
|
compr = device->device_data;
|
||
|
snd_compress_proc_done(compr);
|
||
|
put_device(&compr->dev);
|
||
|
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, const char *id, struct snd_compr *compr)
|
||
|
{
|
||
|
static struct snd_device_ops ops = {
|
||
|
.dev_free = snd_compress_dev_free,
|
||
|
.dev_register = snd_compress_dev_register,
|
||
|
.dev_disconnect = snd_compress_dev_disconnect,
|
||
|
};
|
||
|
int ret;
|
||
|
|
||
|
compr->card = card;
|
||
|
compr->device = device;
|
||
|
compr->direction = dirn;
|
||
|
|
||
|
snd_compress_set_id(compr, id);
|
||
|
|
||
|
snd_device_initialize(&compr->dev, card);
|
||
|
dev_set_name(&compr->dev, "comprC%iD%i", card->number, device);
|
||
|
|
||
|
ret = snd_device_new(card, SNDRV_DEV_COMPRESS, compr, &ops);
|
||
|
if (ret == 0)
|
||
|
snd_compress_proc_init(compr);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
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->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);
|
||
|
|
||
|
MODULE_DESCRIPTION("ALSA Compressed offload framework");
|
||
|
MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
|
||
|
MODULE_LICENSE("GPL v2");
|