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1264 lines
31 KiB
1264 lines
31 KiB
// 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 <[email protected]> |
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* Pierre-Louis Bossart <[email protected]> |
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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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|
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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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|
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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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|
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static DEFINE_MUTEX(device_mutex); |
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|
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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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static void error_delayed_work(struct work_struct *work); |
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|
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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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struct snd_compr *compr; |
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struct snd_compr_file *data; |
|
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); |
|
return -EINVAL; |
|
} |
|
|
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data = kzalloc(sizeof(*data), GFP_KERNEL); |
|
if (!data) { |
|
snd_card_unref(compr->card); |
|
return -ENOMEM; |
|
} |
|
|
|
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; |
|
data->stream.device = compr; |
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runtime = kzalloc(sizeof(*runtime), GFP_KERNEL); |
|
if (!runtime) { |
|
kfree(data); |
|
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) { |
|
kfree(runtime); |
|
kfree(data); |
|
} |
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snd_card_unref(compr->card); |
|
return ret; |
|
} |
|
|
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static int snd_compr_free(struct inode *inode, struct file *f) |
|
{ |
|
struct snd_compr_file *data = f->private_data; |
|
struct snd_compr_runtime *runtime = data->stream.runtime; |
|
|
|
cancel_delayed_work_sync(&data->stream.error_work); |
|
|
|
switch (runtime->state) { |
|
case SNDRV_PCM_STATE_RUNNING: |
|
case SNDRV_PCM_STATE_DRAINING: |
|
case SNDRV_PCM_STATE_PAUSED: |
|
data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP); |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
data->stream.ops->free(&data->stream); |
|
if (!data->stream.runtime->dma_buffer_p) |
|
kfree(data->stream.runtime->buffer); |
|
kfree(data->stream.runtime); |
|
kfree(data); |
|
return 0; |
|
} |
|
|
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static int snd_compr_update_tstamp(struct snd_compr_stream *stream, |
|
struct snd_compr_tstamp *tstamp) |
|
{ |
|
if (!stream->ops->pointer) |
|
return -ENOTSUPP; |
|
stream->ops->pointer(stream, tstamp); |
|
pr_debug("dsp consumed till %d total %d bytes\n", |
|
tstamp->byte_offset, tstamp->copied_total); |
|
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) |
|
{ |
|
memset(avail, 0, sizeof(*avail)); |
|
snd_compr_update_tstamp(stream, &avail->tstamp); |
|
/* Still need to return avail even if tstamp can't be filled in */ |
|
|
|
if (stream->runtime->total_bytes_available == 0 && |
|
stream->runtime->state == SNDRV_PCM_STATE_SETUP && |
|
stream->direction == SND_COMPRESS_PLAYBACK) { |
|
pr_debug("detected init and someone forgot to do a write\n"); |
|
return stream->runtime->buffer_size; |
|
} |
|
pr_debug("app wrote %lld, DSP consumed %lld\n", |
|
stream->runtime->total_bytes_available, |
|
stream->runtime->total_bytes_transferred); |
|
if (stream->runtime->total_bytes_available == |
|
stream->runtime->total_bytes_transferred) { |
|
if (stream->direction == SND_COMPRESS_PLAYBACK) { |
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pr_debug("both pointers are same, returning full avail\n"); |
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return stream->runtime->buffer_size; |
|
} else { |
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pr_debug("both pointers are same, returning no avail\n"); |
|
return 0; |
|
} |
|
} |
|
|
|
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); |
|
return avail->avail; |
|
} |
|
|
|
static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream) |
|
{ |
|
struct snd_compr_avail avail; |
|
|
|
return snd_compr_calc_avail(stream, &avail); |
|
} |
|
|
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static int |
|
snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg) |
|
{ |
|
struct snd_compr_avail ioctl_avail; |
|
size_t avail; |
|
|
|
avail = snd_compr_calc_avail(stream, &ioctl_avail); |
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ioctl_avail.avail = avail; |
|
|
|
switch (stream->runtime->state) { |
|
case SNDRV_PCM_STATE_OPEN: |
|
return -EBADFD; |
|
case SNDRV_PCM_STATE_XRUN: |
|
return -EPIPE; |
|
default: |
|
break; |
|
} |
|
|
|
if (copy_to_user((__u64 __user *)arg, |
|
&ioctl_avail, sizeof(ioctl_avail))) |
|
return -EFAULT; |
|
return 0; |
|
} |
|
|
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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; |
|
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); |
|
|
|
dstn = runtime->buffer + app_pointer; |
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pr_debug("copying %ld at %lld\n", |
|
(unsigned long)count, app_pointer); |
|
if (count < runtime->buffer_size - app_pointer) { |
|
if (copy_from_user(dstn, buf, count)) |
|
return -EFAULT; |
|
} else { |
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copy = runtime->buffer_size - app_pointer; |
|
if (copy_from_user(dstn, buf, copy)) |
|
return -EFAULT; |
|
if (copy_from_user(runtime->buffer, buf + copy, count - copy)) |
|
return -EFAULT; |
|
} |
|
/* if DSP cares, let it know data has been written */ |
|
if (stream->ops->ack) |
|
stream->ops->ack(stream, count); |
|
return count; |
|
} |
|
|
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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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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)) |
|
return -EFAULT; |
|
|
|
stream = &data->stream; |
|
mutex_lock(&stream->device->lock); |
|
/* write is allowed when stream is running or has been steup */ |
|
switch (stream->runtime->state) { |
|
case SNDRV_PCM_STATE_SETUP: |
|
case SNDRV_PCM_STATE_PREPARED: |
|
case SNDRV_PCM_STATE_RUNNING: |
|
break; |
|
default: |
|
mutex_unlock(&stream->device->lock); |
|
return -EBADFD; |
|
} |
|
|
|
avail = snd_compr_get_avail(stream); |
|
pr_debug("avail returned %ld\n", (unsigned long)avail); |
|
/* calculate how much we can write to buffer */ |
|
if (avail > count) |
|
avail = count; |
|
|
|
if (stream->ops->copy) { |
|
char __user* cbuf = (char __user*)buf; |
|
retval = stream->ops->copy(stream, cbuf, avail); |
|
} else { |
|
retval = snd_compr_write_data(stream, buf, avail); |
|
} |
|
if (retval > 0) |
|
stream->runtime->total_bytes_available += retval; |
|
|
|
/* while initiating the stream, write should be called before START |
|
* call, so in setup move state */ |
|
if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) { |
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stream->runtime->state = SNDRV_PCM_STATE_PREPARED; |
|
pr_debug("stream prepared, Houston we are good to go\n"); |
|
} |
|
|
|
mutex_unlock(&stream->device->lock); |
|
return retval; |
|
} |
|
|
|
|
|
static ssize_t snd_compr_read(struct file *f, char __user *buf, |
|
size_t count, loff_t *offset) |
|
{ |
|
struct snd_compr_file *data = f->private_data; |
|
struct snd_compr_stream *stream; |
|
size_t avail; |
|
int retval; |
|
|
|
if (snd_BUG_ON(!data)) |
|
return -EFAULT; |
|
|
|
stream = &data->stream; |
|
mutex_lock(&stream->device->lock); |
|
|
|
/* read is allowed when stream is running, paused, draining and setup |
|
* (yes setup is state which we transition to after stop, so if user |
|
* 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 */ |
|
|
|
int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size) |
|
{ |
|
struct snd_dma_buffer *dmab; |
|
int ret; |
|
|
|
if (snd_BUG_ON(!(stream) || !(stream)->runtime)) |
|
return -EINVAL; |
|
dmab = kzalloc(sizeof(*dmab), GFP_KERNEL); |
|
if (!dmab) |
|
return -ENOMEM; |
|
dmab->dev = stream->dma_buffer.dev; |
|
ret = snd_dma_alloc_pages(dmab->dev.type, dmab->dev.dev, size, dmab); |
|
if (ret < 0) { |
|
kfree(dmab); |
|
return ret; |
|
} |
|
|
|
snd_compr_set_runtime_buffer(stream, dmab); |
|
stream->runtime->dma_bytes = size; |
|
return 1; |
|
} |
|
EXPORT_SYMBOL(snd_compr_malloc_pages); |
|
|
|
int snd_compr_free_pages(struct snd_compr_stream *stream) |
|
{ |
|
struct snd_compr_runtime *runtime; |
|
|
|
if (snd_BUG_ON(!(stream) || !(stream)->runtime)) |
|
return -EINVAL; |
|
runtime = stream->runtime; |
|
if (runtime->dma_area == NULL) |
|
return 0; |
|
if (runtime->dma_buffer_p != &stream->dma_buffer) { |
|
/* It's a newly allocated buffer. Release it now. */ |
|
snd_dma_free_pages(runtime->dma_buffer_p); |
|
kfree(runtime->dma_buffer_p); |
|
} |
|
|
|
snd_compr_set_runtime_buffer(stream, NULL); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(snd_compr_free_pages); |
|
|
|
/* 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; |
|
|
|
switch (stream->runtime->state) { |
|
case SNDRV_PCM_STATE_RUNNING: |
|
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); |
|
if (!retval) |
|
stream->runtime->state = SNDRV_PCM_STATE_PAUSED; |
|
break; |
|
case SNDRV_PCM_STATE_DRAINING: |
|
if (!stream->device->use_pause_in_draining) |
|
return -EPERM; |
|
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH); |
|
if (!retval) |
|
stream->pause_in_draining = true; |
|
break; |
|
default: |
|
return -EPERM; |
|
} |
|
return retval; |
|
} |
|
|
|
static int snd_compr_resume(struct snd_compr_stream *stream) |
|
{ |
|
int retval; |
|
|
|
switch (stream->runtime->state) { |
|
case SNDRV_PCM_STATE_PAUSED: |
|
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE); |
|
if (!retval) |
|
stream->runtime->state = SNDRV_PCM_STATE_RUNNING; |
|
break; |
|
case SNDRV_PCM_STATE_DRAINING: |
|
if (!stream->pause_in_draining) |
|
return -EPERM; |
|
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE); |
|
if (!retval) |
|
stream->pause_in_draining = false; |
|
break; |
|
default: |
|
return -EPERM; |
|
} |
|
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) { |
|
/* clear flags and stop any drain wait */ |
|
stream->partial_drain = false; |
|
stream->metadata_set = false; |
|
stream->pause_in_draining = false; |
|
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; |
|
|
|
stream->partial_drain = true; |
|
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; |
|
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) |
|
{ |
|
strscpy(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 const 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 <[email protected]>"); |
|
MODULE_LICENSE("GPL v2");
|
|
|