linux/sound/core/compress_offload.c
Takashi Iwai 462b3f161b ALSA: compress: Disable GET_CODEC_CAPS ioctl for some architectures
Some architectures like PowerPC can handle the maximum struct size in
an ioctl only up to 13 bits, and struct snd_compr_codec_caps used by
SNDRV_COMPRESS_GET_CODEC_CAPS ioctl overflows this limit.  This
problem was revealed recently by a powerpc change, as it's now treated
as a fatal build error.

This patch is a stop-gap for that: for architectures with less than 14
bit ioctl struct size, get rid of the handling of the relevant ioctl.
We should provide an alternative equivalent ioctl code later, but for
now just paper over it.  Luckily, the compress API hasn't been used on
such architectures, so the impact must be effectively zero.

Reviewed-by: Mark Brown <broonie@kernel.org>
Acked-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-01-25 20:27:33 +01:00

1117 lines
28 KiB
C

/*
* compress_core.c - compress offload core
*
* Copyright (C) 2011 Intel Corporation
* Authors: Vinod Koul <vinod.koul@linux.intel.com>
* Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#define FORMAT(fmt) "%s: %d: " fmt, __func__, __LINE__
#define pr_fmt(fmt) KBUILD_MODNAME ": " FORMAT(fmt)
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/math64.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/uio.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/compat.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/info.h>
#include <sound/compress_params.h>
#include <sound/compress_offload.h>
#include <sound/compress_driver.h>
/* struct snd_compr_codec_caps overflows the ioctl bit size for some
* architectures, so we need to disable the relevant ioctls.
*/
#if _IOC_SIZEBITS < 14
#define COMPR_CODEC_CAPS_OVERFLOW
#endif
/* TODO:
* - add substream support for multiple devices in case of
* SND_DYNAMIC_MINORS is not used
* - Multiple node representation
* driver should be able to register multiple nodes
*/
static DEFINE_MUTEX(device_mutex);
struct snd_compr_file {
unsigned long caps;
struct snd_compr_stream stream;
};
/*
* a note on stream states used:
* we use follwing states in the compressed core
* SNDRV_PCM_STATE_OPEN: When stream has been opened.
* SNDRV_PCM_STATE_SETUP: When stream has been initialized. This is done by
* calling SNDRV_COMPRESS_SET_PARAMS. running streams will come to this
* state at stop by calling SNDRV_COMPRESS_STOP, or at end of drain.
* SNDRV_PCM_STATE_RUNNING: When stream has been started and is
* decoding/encoding and rendering/capturing data.
* SNDRV_PCM_STATE_DRAINING: When stream is draining current data. This is done
* by calling SNDRV_COMPRESS_DRAIN.
* SNDRV_PCM_STATE_PAUSED: When stream is paused. This is done by calling
* SNDRV_COMPRESS_PAUSE. It can be stopped or resumed by calling
* SNDRV_COMPRESS_STOP or SNDRV_COMPRESS_RESUME respectively.
*/
static int snd_compr_open(struct inode *inode, struct file *f)
{
struct snd_compr *compr;
struct snd_compr_file *data;
struct snd_compr_runtime *runtime;
enum snd_compr_direction dirn;
int maj = imajor(inode);
int ret;
if ((f->f_flags & O_ACCMODE) == O_WRONLY)
dirn = SND_COMPRESS_PLAYBACK;
else if ((f->f_flags & O_ACCMODE) == O_RDONLY)
dirn = SND_COMPRESS_CAPTURE;
else
return -EINVAL;
if (maj == snd_major)
compr = snd_lookup_minor_data(iminor(inode),
SNDRV_DEVICE_TYPE_COMPRESS);
else
return -EBADFD;
if (compr == NULL) {
pr_err("no device data!!!\n");
return -ENODEV;
}
if (dirn != compr->direction) {
pr_err("this device doesn't support this direction\n");
snd_card_unref(compr->card);
return -EINVAL;
}
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
snd_card_unref(compr->card);
return -ENOMEM;
}
data->stream.ops = compr->ops;
data->stream.direction = dirn;
data->stream.private_data = compr->private_data;
data->stream.device = compr;
runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
if (!runtime) {
kfree(data);
snd_card_unref(compr->card);
return -ENOMEM;
}
runtime->state = SNDRV_PCM_STATE_OPEN;
init_waitqueue_head(&runtime->sleep);
data->stream.runtime = runtime;
f->private_data = (void *)data;
mutex_lock(&compr->lock);
ret = compr->ops->open(&data->stream);
mutex_unlock(&compr->lock);
if (ret) {
kfree(runtime);
kfree(data);
}
snd_card_unref(compr->card);
return ret;
}
static int snd_compr_free(struct inode *inode, struct file *f)
{
struct snd_compr_file *data = f->private_data;
struct snd_compr_runtime *runtime = data->stream.runtime;
switch (runtime->state) {
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_DRAINING:
case SNDRV_PCM_STATE_PAUSED:
data->stream.ops->trigger(&data->stream, SNDRV_PCM_TRIGGER_STOP);
break;
default:
break;
}
data->stream.ops->free(&data->stream);
kfree(data->stream.runtime->buffer);
kfree(data->stream.runtime);
kfree(data);
return 0;
}
static int snd_compr_update_tstamp(struct snd_compr_stream *stream,
struct snd_compr_tstamp *tstamp)
{
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)
stream->runtime->total_bytes_transferred = tstamp->copied_total;
else
stream->runtime->total_bytes_available = tstamp->copied_total;
return 0;
}
static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
struct snd_compr_avail *avail)
{
memset(avail, 0, sizeof(*avail));
snd_compr_update_tstamp(stream, &avail->tstamp);
/* Still need to return avail even if tstamp can't be filled in */
if (stream->runtime->total_bytes_available == 0 &&
stream->runtime->state == SNDRV_PCM_STATE_SETUP &&
stream->direction == SND_COMPRESS_PLAYBACK) {
pr_debug("detected init and someone forgot to do a write\n");
return stream->runtime->buffer_size;
}
pr_debug("app wrote %lld, DSP consumed %lld\n",
stream->runtime->total_bytes_available,
stream->runtime->total_bytes_transferred);
if (stream->runtime->total_bytes_available ==
stream->runtime->total_bytes_transferred) {
if (stream->direction == SND_COMPRESS_PLAYBACK) {
pr_debug("both pointers are same, returning full avail\n");
return stream->runtime->buffer_size;
} else {
pr_debug("both pointers are same, returning no avail\n");
return 0;
}
}
avail->avail = stream->runtime->total_bytes_available -
stream->runtime->total_bytes_transferred;
if (stream->direction == SND_COMPRESS_PLAYBACK)
avail->avail = stream->runtime->buffer_size - avail->avail;
pr_debug("ret avail as %lld\n", avail->avail);
return avail->avail;
}
static inline size_t snd_compr_get_avail(struct snd_compr_stream *stream)
{
struct snd_compr_avail avail;
return snd_compr_calc_avail(stream, &avail);
}
static int
snd_compr_ioctl_avail(struct snd_compr_stream *stream, unsigned long arg)
{
struct snd_compr_avail ioctl_avail;
size_t avail;
avail = snd_compr_calc_avail(stream, &ioctl_avail);
ioctl_avail.avail = avail;
if (copy_to_user((__u64 __user *)arg,
&ioctl_avail, sizeof(ioctl_avail)))
return -EFAULT;
return 0;
}
static int snd_compr_write_data(struct snd_compr_stream *stream,
const char __user *buf, size_t count)
{
void *dstn;
size_t copy;
struct snd_compr_runtime *runtime = stream->runtime;
/* 64-bit Modulus */
u64 app_pointer = div64_u64(runtime->total_bytes_available,
runtime->buffer_size);
app_pointer = runtime->total_bytes_available -
(app_pointer * runtime->buffer_size);
dstn = runtime->buffer + app_pointer;
pr_debug("copying %ld at %lld\n",
(unsigned long)count, app_pointer);
if (count < runtime->buffer_size - app_pointer) {
if (copy_from_user(dstn, buf, count))
return -EFAULT;
} else {
copy = runtime->buffer_size - app_pointer;
if (copy_from_user(dstn, buf, copy))
return -EFAULT;
if (copy_from_user(runtime->buffer, buf + copy, count - copy))
return -EFAULT;
}
/* if DSP cares, let it know data has been written */
if (stream->ops->ack)
stream->ops->ack(stream, count);
return count;
}
static ssize_t snd_compr_write(struct file *f, const char __user *buf,
size_t count, loff_t *offset)
{
struct snd_compr_file *data = f->private_data;
struct snd_compr_stream *stream;
size_t avail;
int retval;
if (snd_BUG_ON(!data))
return -EFAULT;
stream = &data->stream;
mutex_lock(&stream->device->lock);
/* write is allowed when stream is running or has been steup */
if (stream->runtime->state != SNDRV_PCM_STATE_SETUP &&
stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
mutex_unlock(&stream->device->lock);
return -EBADFD;
}
avail = snd_compr_get_avail(stream);
pr_debug("avail returned %ld\n", (unsigned long)avail);
/* calculate how much we can write to buffer */
if (avail > count)
avail = count;
if (stream->ops->copy) {
char __user* cbuf = (char __user*)buf;
retval = stream->ops->copy(stream, cbuf, avail);
} else {
retval = snd_compr_write_data(stream, buf, avail);
}
if (retval > 0)
stream->runtime->total_bytes_available += retval;
/* while initiating the stream, write should be called before START
* call, so in setup move state */
if (stream->runtime->state == SNDRV_PCM_STATE_SETUP) {
stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
pr_debug("stream prepared, Houston we are good to go\n");
}
mutex_unlock(&stream->device->lock);
return retval;
}
static ssize_t snd_compr_read(struct file *f, char __user *buf,
size_t count, loff_t *offset)
{
struct snd_compr_file *data = f->private_data;
struct snd_compr_stream *stream;
size_t avail;
int retval;
if (snd_BUG_ON(!data))
return -EFAULT;
stream = &data->stream;
mutex_lock(&stream->device->lock);
/* read is allowed when stream is running, 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_XRUN:
case SNDRV_PCM_STATE_SUSPENDED:
case SNDRV_PCM_STATE_DISCONNECTED:
retval = -EBADFD;
goto out;
}
avail = snd_compr_get_avail(stream);
pr_debug("avail returned %ld\n", (unsigned long)avail);
/* calculate how much we can read from buffer */
if (avail > count)
avail = count;
if (stream->ops->copy) {
retval = stream->ops->copy(stream, buf, avail);
} else {
retval = -ENXIO;
goto out;
}
if (retval > 0)
stream->runtime->total_bytes_transferred += retval;
out:
mutex_unlock(&stream->device->lock);
return retval;
}
static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
{
return -ENXIO;
}
static inline int snd_compr_get_poll(struct snd_compr_stream *stream)
{
if (stream->direction == SND_COMPRESS_PLAYBACK)
return POLLOUT | POLLWRNORM;
else
return POLLIN | POLLRDNORM;
}
static unsigned int snd_compr_poll(struct file *f, poll_table *wait)
{
struct snd_compr_file *data = f->private_data;
struct snd_compr_stream *stream;
size_t avail;
int retval = 0;
if (snd_BUG_ON(!data))
return -EFAULT;
stream = &data->stream;
if (snd_BUG_ON(!stream))
return -EFAULT;
mutex_lock(&stream->device->lock);
if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
retval = -EBADFD;
goto out;
}
poll_wait(f, &stream->runtime->sleep, wait);
avail = snd_compr_get_avail(stream);
pr_debug("avail is %ld\n", (unsigned long)avail);
/* check if we have at least one fragment to fill */
switch (stream->runtime->state) {
case SNDRV_PCM_STATE_DRAINING:
/* stream has been woken up after drain is complete
* draining done so set stream state to stopped
*/
retval = snd_compr_get_poll(stream);
stream->runtime->state = SNDRV_PCM_STATE_SETUP;
break;
case SNDRV_PCM_STATE_RUNNING:
case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_PAUSED:
if (avail >= stream->runtime->fragment_size)
retval = snd_compr_get_poll(stream);
break;
default:
if (stream->direction == SND_COMPRESS_PLAYBACK)
retval = POLLOUT | POLLWRNORM | POLLERR;
else
retval = POLLIN | POLLRDNORM | POLLERR;
break;
}
out:
mutex_unlock(&stream->device->lock);
return retval;
}
static int
snd_compr_get_caps(struct snd_compr_stream *stream, unsigned long arg)
{
int retval;
struct snd_compr_caps caps;
if (!stream->ops->get_caps)
return -ENXIO;
memset(&caps, 0, sizeof(caps));
retval = stream->ops->get_caps(stream, &caps);
if (retval)
goto out;
if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
retval = -EFAULT;
out:
return retval;
}
#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;
buffer_size = params->buffer.fragment_size * params->buffer.fragments;
if (stream->ops->copy) {
buffer = NULL;
/* if copy is defined the driver will be required to copy
* the data from core
*/
} else {
buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
}
stream->runtime->fragment_size = params->buffer.fragment_size;
stream->runtime->fragments = params->buffer.fragments;
stream->runtime->buffer = buffer;
stream->runtime->buffer_size = buffer_size;
return 0;
}
static int snd_compress_check_input(struct snd_compr_params *params)
{
/* first let's check the buffer parameter's */
if (params->buffer.fragment_size == 0 ||
params->buffer.fragments > INT_MAX / params->buffer.fragment_size)
return -EINVAL;
/* now codec parameters */
if (params->codec.id == 0 || params->codec.id > SND_AUDIOCODEC_MAX)
return -EINVAL;
if (params->codec.ch_in == 0 || params->codec.ch_out == 0)
return -EINVAL;
return 0;
}
static int
snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
{
struct snd_compr_params *params;
int retval;
if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
/*
* we should allow parameter change only when stream has been
* opened not in other cases
*/
params = kmalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
retval = -EFAULT;
goto out;
}
retval = snd_compress_check_input(params);
if (retval)
goto out;
retval = snd_compr_allocate_buffer(stream, params);
if (retval) {
retval = -ENOMEM;
goto out;
}
retval = stream->ops->set_params(stream, params);
if (retval)
goto out;
stream->metadata_set = false;
stream->next_track = false;
if (stream->direction == SND_COMPRESS_PLAYBACK)
stream->runtime->state = SNDRV_PCM_STATE_SETUP;
else
stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
} else {
return -EPERM;
}
out:
kfree(params);
return retval;
}
static int
snd_compr_get_params(struct snd_compr_stream *stream, unsigned long arg)
{
struct snd_codec *params;
int retval;
if (!stream->ops->get_params)
return -EBADFD;
params = kzalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
retval = stream->ops->get_params(stream, params);
if (retval)
goto out;
if (copy_to_user((char __user *)arg, params, sizeof(*params)))
retval = -EFAULT;
out:
kfree(params);
return retval;
}
static int
snd_compr_get_metadata(struct snd_compr_stream *stream, unsigned long arg)
{
struct snd_compr_metadata metadata;
int retval;
if (!stream->ops->get_metadata)
return -ENXIO;
if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
return -EFAULT;
retval = stream->ops->get_metadata(stream, &metadata);
if (retval != 0)
return retval;
if (copy_to_user((void __user *)arg, &metadata, sizeof(metadata)))
return -EFAULT;
return 0;
}
static int
snd_compr_set_metadata(struct snd_compr_stream *stream, unsigned long arg)
{
struct snd_compr_metadata metadata;
int retval;
if (!stream->ops->set_metadata)
return -ENXIO;
/*
* we should allow parameter change only when stream has been
* opened not in other cases
*/
if (copy_from_user(&metadata, (void __user *)arg, sizeof(metadata)))
return -EFAULT;
retval = stream->ops->set_metadata(stream, &metadata);
stream->metadata_set = true;
return retval;
}
static inline int
snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
{
struct snd_compr_tstamp tstamp = {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;
if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
return -EPERM;
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
if (!retval)
stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
return retval;
}
static int snd_compr_stop(struct snd_compr_stream *stream)
{
int retval;
if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
stream->runtime->state == SNDRV_PCM_STATE_SETUP)
return -EPERM;
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
if (!retval) {
snd_compr_drain_notify(stream);
stream->runtime->total_bytes_available = 0;
stream->runtime->total_bytes_transferred = 0;
}
return retval;
}
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 notfication 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");
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;
if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
stream->runtime->state == SNDRV_PCM_STATE_SETUP)
return -EPERM;
retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
if (retval) {
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;
/* you can signal next track isf this is intended to be a gapless stream
* and current track metadata is set
*/
if (stream->metadata_set == false)
return -EPERM;
retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_NEXT_TRACK);
if (retval != 0)
return retval;
stream->metadata_set = false;
stream->next_track = true;
return 0;
}
static int snd_compr_partial_drain(struct snd_compr_stream *stream)
{
int retval;
if (stream->runtime->state == SNDRV_PCM_STATE_PREPARED ||
stream->runtime->state == SNDRV_PCM_STATE_SETUP)
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;
if (snd_BUG_ON(!stream))
return -EFAULT;
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;
char str[16];
struct snd_compr *compr;
if (snd_BUG_ON(!device || !device->device_data))
return -EBADFD;
compr = device->device_data;
pr_debug("reg %s for device %s, direction %d\n", str, compr->name,
compr->direction);
/* register compressed device */
ret = snd_register_device(SNDRV_DEVICE_TYPE_COMPRESS,
compr->card, compr->device,
&snd_compr_file_ops, compr, &compr->dev);
if (ret < 0) {
pr_err("snd_register_device failed\n %d", ret);
return ret;
}
return ret;
}
static int snd_compress_dev_disconnect(struct snd_device *device)
{
struct snd_compr *compr;
compr = device->device_data;
snd_unregister_device(&compr->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 | S_IRUGO | S_IXUGO;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
return -ENOMEM;
}
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);
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
entry = NULL;
}
}
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);
static int __init snd_compress_init(void)
{
return 0;
}
static void __exit snd_compress_exit(void)
{
}
module_init(snd_compress_init);
module_exit(snd_compress_exit);
MODULE_DESCRIPTION("ALSA Compressed offload framework");
MODULE_AUTHOR("Vinod Koul <vinod.koul@linux.intel.com>");
MODULE_LICENSE("GPL v2");