M7350/kernel/sound/compress_offload/core.c

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2024-09-09 08:52:07 +00:00
/*
* 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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
*/
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/uio.h>
#include <linux/uaccess.h>
#include <sound/snd_compress_params.h>
#include <sound/compress_offload.h>
#include <sound/compress_driver.h>
/* TODO:
* - Integrate with alsa, compressed devices should register as alsa devices
* as /dev/snd_compr_xxx
* - Integrate with ASoC:
* Opening compressed path should also start the codec dai
* TBD how the cpu dai will be viewed and started.
* ASoC should always be optional part
* (we should be able to use this framework in non asoc systems
* - Multiple node representation
* driver should be able to register multiple nodes
* - Version numbering for API
*/
static DEFINE_MUTEX(device_mutex);
static LIST_HEAD(device_list);
static LIST_HEAD(misc_list);
/*
* currently we are using misc device for registration and exposing ioctls
* this is temporary and will be moved to snd
* the device should be registered as /dev/snd_compr.....
*/
struct snd_compr_misc {
struct miscdevice misc;
struct list_head list;
struct snd_compr *compr;
};
struct snd_ioctl_data {
struct snd_compr_misc *misc;
unsigned long caps;
unsigned int minor;
struct snd_compr_stream stream;
};
static struct snd_compr_misc *snd_compr_get_device(unsigned int minor)
{
struct snd_compr_misc *misc;
list_for_each_entry(misc, &misc_list, list) {
if (minor == misc->misc.minor)
return misc;
}
return NULL;
}
static int snd_compr_open(struct inode *inode, struct file *f)
{
unsigned int minor = iminor(inode);
struct snd_compr_misc *misc = snd_compr_get_device(minor);
struct snd_ioctl_data *data;
struct snd_compr_runtime *runtime;
unsigned int direction;
int ret;
mutex_lock(&device_mutex);
if (f->f_flags & O_WRONLY)
direction = SNDRV_PCM_STREAM_PLAYBACK;
else {
ret = -ENXIO;
goto out;
}
/* curently only encoded playback is supported, above needs to be
* removed once we have recording support */
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto out;
}
data->misc = misc;
data->minor = minor;
data->stream.ops = misc->compr->ops;
data->stream.direction = direction;
data->stream.private_data = misc->compr->private_data;
data->stream.device = misc->compr;
runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
if (!runtime) {
ret = -ENOMEM;
kfree(data);
goto out;
}
runtime->state = SNDRV_PCM_STATE_OPEN;
init_waitqueue_head(&runtime->sleep);
data->stream.runtime = runtime;
f->private_data = (void *)data;
ret = misc->compr->ops->open(&data->stream);
if (ret) {
kfree(runtime);
kfree(data);
goto out;
}
out:
mutex_unlock(&device_mutex);
return ret;
}
static int snd_compr_free(struct inode *inode, struct file *f)
{
struct snd_ioctl_data *data = f->private_data;
mutex_lock(&device_mutex);
data->stream.ops->free(&data->stream);
kfree(data->stream.runtime->buffer);
kfree(data->stream.runtime);
kfree(data);
mutex_unlock(&device_mutex);
return 0;
}
static void snd_compr_update_tstamp(struct snd_compr_stream *stream,
struct snd_compr_tstamp *tstamp)
{
stream->ops->pointer(stream, tstamp);
stream->runtime->hw_pointer = tstamp->copied_bytes;
}
static size_t snd_compr_calc_avail(struct snd_compr_stream *stream,
struct snd_compr_avail *avail)
{
size_t avail_calc;
snd_compr_update_tstamp(stream, &avail->tstamp);
avail_calc = stream->runtime->app_pointer - stream->runtime->hw_pointer;
if (avail_calc < 0)
avail_calc = stream->runtime->buffer_size + avail_calc;
avail->avail = avail_calc;
return avail_calc;
}
static 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;
snd_compr_calc_avail(stream, &ioctl_avail);
if (copy_to_user((unsigned long __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;
dstn = stream->runtime->buffer + stream->runtime->app_pointer;
if (count < stream->runtime->buffer_size - stream->runtime->app_pointer) {
if (copy_from_user(dstn, buf, count))
return -EFAULT;
stream->runtime->app_pointer += count;
} else {
copy = stream->runtime->buffer_size - stream->runtime->app_pointer;
if (copy_from_user(dstn, buf, copy))
return -EFAULT;
if (copy_from_user(stream->runtime->buffer, buf + copy, count - copy))
return -EFAULT;
stream->runtime->app_pointer = count - copy;
}
/* if DSP cares, let it know data has been written */
if (stream->ops->ack)
stream->ops->ack(stream);
return count;
}
static ssize_t snd_compr_write(struct file *f, const char __user *buf,
size_t count, loff_t *offset)
{
struct snd_ioctl_data *data = f->private_data;
struct snd_compr_stream *stream;
size_t avail;
int retval;
BUG_ON(!data);
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 -EPERM;
}
avail = snd_compr_get_avail(stream);
/* calculate how much we can write to buffer */
if (avail > count)
avail = count;
if (stream->ops->copy)
retval = stream->ops->copy(stream, buf, avail);
else
retval = snd_compr_write_data(stream, buf, avail);
/* 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;
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)
{
return -ENXIO;
}
static int snd_compr_mmap(struct file *f, struct vm_area_struct *vma)
{
return -ENXIO;
}
unsigned int snd_compr_poll(struct file *f, poll_table *wait)
{
struct snd_ioctl_data *data = f->private_data;
struct snd_compr_stream *stream;
int retval = 0;
BUG_ON(!data);
stream = &data->stream;
mutex_lock(&stream->device->lock);
if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
retval = -ENXIO;
goto out;
}
poll_wait(f, &stream->runtime->sleep, wait);
/* this would change after read is implemented, we would need to
* check for direction here */
if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING)
retval = POLLOUT | POLLWRNORM;
out:
mutex_unlock(&stream->device->lock);
return retval;
}
void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
{
size_t avail;
if (stream->direction != SNDRV_PCM_STREAM_PLAYBACK)
return;
avail = snd_compr_get_avail(stream);
if (avail >= stream->runtime->fragment_size)
wake_up(&stream->runtime->sleep);
}
EXPORT_SYMBOL_GPL(snd_compr_fragment_elapsed);
void snd_compr_frame_elapsed(struct snd_compr_stream *stream)
{
size_t avail;
if (stream->direction != SNDRV_PCM_STREAM_CAPTURE)
return;
avail = snd_compr_get_avail(stream);
if (avail)
wake_up(&stream->runtime->sleep);
}
EXPORT_SYMBOL_GPL(snd_compr_frame_elapsed);
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;
retval = stream->ops->get_caps(stream, &caps);
if (retval)
goto out;
if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
retval = -EFAULT;
out:
return retval;
}
static int snd_compr_get_codec_caps(struct snd_compr_stream *stream, unsigned long arg)
{
int retval;
struct snd_compr_codec_caps *caps;
if (!stream->ops->get_codec_caps)
return -ENXIO;
caps = kmalloc(sizeof(*caps), GFP_KERNEL);
if (!caps)
return -ENOMEM;
retval = stream->ops->get_codec_caps(stream, caps);
if (retval)
goto out;
if (copy_to_user((void __user *)arg, caps, sizeof(*caps)))
retval = -EFAULT;
out:
kfree(caps);
return retval;
}
/* revisit this with snd_pcm_preallocate_xxx */
static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
struct snd_compr_params *params)
{
unsigned int buffer_size;
void *buffer;
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_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)))
return -EFAULT;
retval = snd_compr_allocate_buffer(stream, params);
if (retval) {
kfree(params);
return -ENOMEM;
}
retval = stream->ops->set_params(stream, params);
if (retval)
goto out;
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_compr_params *params;
int retval;
if (!stream->ops->get_params)
return -ENXIO;
params = kmalloc(sizeof(*params), GFP_KERNEL);
if (!params)
return -ENOMEM;
retval = stream->ops->get_params(stream, params);
if (retval)
goto out;
if (copy_to_user((char __user *)arg, params, sizeof(*params)))
retval = -EFAULT;
out:
kfree(params);
return retval;
}
static int snd_compr_tstamp(struct snd_compr_stream *stream, unsigned long arg)
{
struct snd_compr_tstamp tstamp;
snd_compr_update_tstamp(stream, &tstamp);
if (copy_to_user((struct snd_compr_tstamp __user *)arg, &tstamp, sizeof(tstamp)))
return -EFAULT;
return 0;
}
static int snd_compr_pause(struct snd_compr_stream *stream)
{
int retval;
if (stream->runtime->state == SNDRV_PCM_STATE_PAUSED)
return 0;
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_PUSH);
if (!retval) {
stream->runtime->state = SNDRV_PCM_STATE_PAUSED;
wake_up(&stream->runtime->sleep);
}
return retval;
}
static int snd_compr_resume(struct snd_compr_stream *stream)
{
int retval;
if (stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
return -EPERM;
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
if (!retval)
stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
return retval;
}
static int snd_compr_start(struct snd_compr_stream *stream)
{
int retval;
if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
return -EPERM;
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_START);
if (!retval)
stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
return retval;
}
static int snd_compr_stop(struct snd_compr_stream *stream)
{
int retval;
if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED)
return -EPERM;
retval = stream->ops->trigger(stream, SNDRV_PCM_TRIGGER_STOP);
if (!retval) {
stream->runtime->state = SNDRV_PCM_STATE_SETUP;
wake_up(&stream->runtime->sleep);
}
return retval;
}
static int snd_compr_drain(struct snd_compr_stream *stream)
{
int retval;
if (stream->runtime->state != SNDRV_PCM_STATE_PREPARED ||
stream->runtime->state != SNDRV_PCM_STATE_PAUSED)
return -EPERM;
retval = stream->ops->trigger(stream, SND_COMPR_TRIGGER_DRAIN);
if (!retval) {
stream->runtime->state = SNDRV_PCM_STATE_SETUP;
wake_up(&stream->runtime->sleep);
}
return retval;
}
static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
{
struct snd_ioctl_data *data = f->private_data;
struct snd_compr_stream *stream;
int retval = -ENOTTY;
BUG_ON(!data);
stream = &data->stream;
mutex_lock(&stream->device->lock);
switch (_IOC_NR(cmd)) {
case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
retval = snd_compr_get_caps(stream, arg);
break;
case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
retval = snd_compr_get_codec_caps(stream, arg);
break;
case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
retval = snd_compr_set_params(stream, arg);
break;
case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
retval = snd_compr_get_params(stream, arg);
break;
case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
retval = snd_compr_tstamp(stream, arg);
break;
case _IOC_NR(SNDRV_COMPRESS_AVAIL):
retval = snd_compr_ioctl_avail(stream, arg);
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):
cmd = SND_COMPR_TRIGGER_DRAIN;
retval = snd_compr_drain(stream);
break;
}
mutex_unlock(&stream->device->lock);
return retval;
}
static const struct file_operations snd_comp_file = {
.owner = THIS_MODULE,
.open = snd_compr_open,
.release = snd_compr_free,
.read = snd_compr_read,
.write = snd_compr_write,
.unlocked_ioctl = snd_compr_ioctl,
.mmap = snd_compr_mmap,
.poll = snd_compr_poll,
};
static int snd_compress_add_device(struct snd_compr *device)
{
int ret;
struct snd_compr_misc *misc = kzalloc(sizeof(*misc), GFP_KERNEL);
misc->misc.name = device->name;
misc->misc.fops = &snd_comp_file;
misc->misc.minor = MISC_DYNAMIC_MINOR;
misc->compr = device;
ret = misc_register(&misc->misc);
if (ret) {
pr_err("couldn't register misc device\n");
kfree(misc);
} else {
pr_debug("Got minor %d\n", misc->misc.minor);
list_add_tail(&misc->list, &misc_list);
}
return ret;
}
static int snd_compress_remove_device(struct snd_compr *device)
{
struct snd_compr_misc *misc, *__misc;
list_for_each_entry_safe(misc, __misc, &misc_list, list) {
if (device == misc->compr) {
misc_deregister(&misc->misc);
list_del(&device->list);
kfree(misc);
}
}
return 0;
}
/**
* snd_compress_register - register compressed device
*
* @device: compressed device to register
*/
int snd_compress_register(struct snd_compr *device)
{
int retval;
if (device->name == NULL || device->dev == NULL || device->ops == NULL)
return -EINVAL;
BUG_ON(!device->ops->open);
BUG_ON(!device->ops->free);
BUG_ON(!device->ops->set_params);
BUG_ON(!device->ops->get_params);
BUG_ON(!device->ops->trigger);
BUG_ON(!device->ops->pointer);
BUG_ON(!device->ops->get_caps);
BUG_ON(!device->ops->get_codec_caps);
INIT_LIST_HEAD(&device->list);
/* todo register the compressed streams */
/* todo integrate with asoc */
/* register a compressed card TBD if this needs change */
pr_debug("Registering compressed device %s\n", device->name);
mutex_lock(&device_mutex);
/* register a msic device for now */
retval = snd_compress_add_device(device);
if (!retval)
list_add_tail(&device->list, &device_list);
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);
list_del(&device->list);
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);