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linux/drivers/media/v4l2-core/v4l2-mc.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Media Controller ancillary functions
*
* Copyright (c) 2016 Mauro Carvalho Chehab <mchehab@kernel.org>
* Copyright (C) 2016 Shuah Khan <shuahkh@osg.samsung.com>
* Copyright (C) 2006-2010 Nokia Corporation
* Copyright (c) 2016 Intel Corporation.
*/
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/usb.h>
#include <media/media-device.h>
#include <media/media-entity.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-mc.h>
#include <media/v4l2-subdev.h>
#include <media/videobuf2-core.h>
int v4l2_mc_create_media_graph(struct media_device *mdev)
{
struct media_entity *entity;
struct media_entity *if_vid = NULL, *if_aud = NULL;
struct media_entity *tuner = NULL, *decoder = NULL;
struct media_entity *io_v4l = NULL, *io_vbi = NULL, *io_swradio = NULL;
bool is_webcam = false;
u32 flags;
int ret, pad_sink, pad_source;
if (!mdev)
return 0;
media_device_for_each_entity(entity, mdev) {
switch (entity->function) {
case MEDIA_ENT_F_IF_VID_DECODER:
if_vid = entity;
break;
case MEDIA_ENT_F_IF_AUD_DECODER:
if_aud = entity;
break;
case MEDIA_ENT_F_TUNER:
tuner = entity;
break;
case MEDIA_ENT_F_ATV_DECODER:
decoder = entity;
break;
case MEDIA_ENT_F_IO_V4L:
io_v4l = entity;
break;
case MEDIA_ENT_F_IO_VBI:
io_vbi = entity;
break;
case MEDIA_ENT_F_IO_SWRADIO:
io_swradio = entity;
break;
case MEDIA_ENT_F_CAM_SENSOR:
is_webcam = true;
break;
}
}
/* It should have at least one I/O entity */
if (!io_v4l && !io_vbi && !io_swradio) {
dev_warn(mdev->dev, "Didn't find any I/O entity\n");
return -EINVAL;
}
/*
* Here, webcams are modelled on a very simple way: the sensor is
* connected directly to the I/O entity. All dirty details, like
* scaler and crop HW are hidden. While such mapping is not enough
* for mc-centric hardware, it is enough for v4l2 interface centric
* PC-consumer's hardware.
*/
if (is_webcam) {
if (!io_v4l) {
dev_warn(mdev->dev, "Didn't find a MEDIA_ENT_F_IO_V4L\n");
return -EINVAL;
}
media_device_for_each_entity(entity, mdev) {
if (entity->function != MEDIA_ENT_F_CAM_SENSOR)
continue;
ret = media_create_pad_link(entity, 0,
io_v4l, 0,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_warn(mdev->dev, "Failed to create a sensor link\n");
return ret;
}
}
if (!decoder)
return 0;
}
/* The device isn't a webcam. So, it should have a decoder */
if (!decoder) {
dev_warn(mdev->dev, "Decoder not found\n");
return -EINVAL;
}
/* Link the tuner and IF video output pads */
if (tuner) {
if (if_vid) {
pad_source = media_get_pad_index(tuner, false,
PAD_SIGNAL_ANALOG);
pad_sink = media_get_pad_index(if_vid, true,
PAD_SIGNAL_ANALOG);
if (pad_source < 0 || pad_sink < 0) {
dev_warn(mdev->dev, "Couldn't get tuner and/or PLL pad(s): (%d, %d)\n",
pad_source, pad_sink);
return -EINVAL;
}
ret = media_create_pad_link(tuner, pad_source,
if_vid, pad_sink,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_warn(mdev->dev, "Couldn't create tuner->PLL link)\n");
return ret;
}
pad_source = media_get_pad_index(if_vid, false,
PAD_SIGNAL_ANALOG);
pad_sink = media_get_pad_index(decoder, true,
PAD_SIGNAL_ANALOG);
if (pad_source < 0 || pad_sink < 0) {
dev_warn(mdev->dev, "get decoder and/or PLL pad(s): (%d, %d)\n",
pad_source, pad_sink);
return -EINVAL;
}
ret = media_create_pad_link(if_vid, pad_source,
decoder, pad_sink,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_warn(mdev->dev, "couldn't link PLL to decoder\n");
return ret;
}
} else {
pad_source = media_get_pad_index(tuner, false,
PAD_SIGNAL_ANALOG);
pad_sink = media_get_pad_index(decoder, true,
PAD_SIGNAL_ANALOG);
if (pad_source < 0 || pad_sink < 0) {
dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s): (%d, %d)\n",
pad_source, pad_sink);
return -EINVAL;
}
ret = media_create_pad_link(tuner, pad_source,
decoder, pad_sink,
MEDIA_LNK_FL_ENABLED);
if (ret)
return ret;
}
if (if_aud) {
pad_source = media_get_pad_index(tuner, false,
PAD_SIGNAL_AUDIO);
pad_sink = media_get_pad_index(if_aud, true,
PAD_SIGNAL_AUDIO);
if (pad_source < 0 || pad_sink < 0) {
dev_warn(mdev->dev, "couldn't get tuner and/or decoder pad(s) for audio: (%d, %d)\n",
pad_source, pad_sink);
return -EINVAL;
}
ret = media_create_pad_link(tuner, pad_source,
if_aud, pad_sink,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_warn(mdev->dev, "couldn't link tuner->audio PLL\n");
return ret;
}
} else {
if_aud = tuner;
}
}
/* Create demod to V4L, VBI and SDR radio links */
if (io_v4l) {
pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
if (pad_source < 0) {
dev_warn(mdev->dev, "couldn't get decoder output pad for V4L I/O\n");
return -EINVAL;
}
ret = media_create_pad_link(decoder, pad_source,
io_v4l, 0,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_warn(mdev->dev, "couldn't link decoder output to V4L I/O\n");
return ret;
}
}
if (io_swradio) {
pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
if (pad_source < 0) {
dev_warn(mdev->dev, "couldn't get decoder output pad for SDR\n");
return -EINVAL;
}
ret = media_create_pad_link(decoder, pad_source,
io_swradio, 0,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_warn(mdev->dev, "couldn't link decoder output to SDR\n");
return ret;
}
}
if (io_vbi) {
pad_source = media_get_pad_index(decoder, false, PAD_SIGNAL_DV);
if (pad_source < 0) {
dev_warn(mdev->dev, "couldn't get decoder output pad for VBI\n");
return -EINVAL;
}
ret = media_create_pad_link(decoder, pad_source,
io_vbi, 0,
MEDIA_LNK_FL_ENABLED);
if (ret) {
dev_warn(mdev->dev, "couldn't link decoder output to VBI\n");
return ret;
}
}
/* Create links for the media connectors */
flags = MEDIA_LNK_FL_ENABLED;
media_device_for_each_entity(entity, mdev) {
switch (entity->function) {
case MEDIA_ENT_F_CONN_RF:
if (!tuner)
continue;
pad_sink = media_get_pad_index(tuner, true,
PAD_SIGNAL_ANALOG);
if (pad_sink < 0) {
dev_warn(mdev->dev, "couldn't get tuner analog pad sink\n");
return -EINVAL;
}
ret = media_create_pad_link(entity, 0, tuner,
pad_sink,
flags);
break;
case MEDIA_ENT_F_CONN_SVIDEO:
case MEDIA_ENT_F_CONN_COMPOSITE:
pad_sink = media_get_pad_index(decoder, true,
PAD_SIGNAL_ANALOG);
if (pad_sink < 0) {
dev_warn(mdev->dev, "couldn't get tuner analog pad sink\n");
return -EINVAL;
}
ret = media_create_pad_link(entity, 0, decoder,
pad_sink,
flags);
break;
default:
continue;
}
if (ret)
return ret;
flags = 0;
}
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_mc_create_media_graph);
int v4l_enable_media_source(struct video_device *vdev)
{
struct media_device *mdev = vdev->entity.graph_obj.mdev;
int ret = 0, err;
if (!mdev)
return 0;
mutex_lock(&mdev->graph_mutex);
if (!mdev->enable_source)
goto end;
err = mdev->enable_source(&vdev->entity, &vdev->pipe);
if (err)
ret = -EBUSY;
end:
mutex_unlock(&mdev->graph_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(v4l_enable_media_source);
void v4l_disable_media_source(struct video_device *vdev)
{
struct media_device *mdev = vdev->entity.graph_obj.mdev;
if (mdev) {
mutex_lock(&mdev->graph_mutex);
if (mdev->disable_source)
mdev->disable_source(&vdev->entity);
mutex_unlock(&mdev->graph_mutex);
}
}
EXPORT_SYMBOL_GPL(v4l_disable_media_source);
int v4l_vb2q_enable_media_source(struct vb2_queue *q)
{
struct v4l2_fh *fh = q->owner;
if (fh && fh->vdev)
return v4l_enable_media_source(fh->vdev);
return 0;
}
EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_source);
/* -----------------------------------------------------------------------------
* Pipeline power management
*
* Entities must be powered up when part of a pipeline that contains at least
* one open video device node.
*
* To achieve this use the entity use_count field to track the number of users.
* For entities corresponding to video device nodes the use_count field stores
* the users count of the node. For entities corresponding to subdevs the
* use_count field stores the total number of users of all video device nodes
* in the pipeline.
*
* The v4l2_pipeline_pm_use() function must be called in the open() and
* close() handlers of video device nodes. It increments or decrements the use
* count of all subdev entities in the pipeline.
*
* To react to link management on powered pipelines, the link setup notification
* callback updates the use count of all entities in the source and sink sides
* of the link.
*/
/*
* pipeline_pm_use_count - Count the number of users of a pipeline
* @entity: The entity
*
* Return the total number of users of all video device nodes in the pipeline.
*/
static int pipeline_pm_use_count(struct media_entity *entity,
struct media_graph *graph)
{
int use = 0;
media_graph_walk_start(graph, entity);
while ((entity = media_graph_walk_next(graph))) {
if (is_media_entity_v4l2_video_device(entity))
use += entity->use_count;
}
return use;
}
/*
* pipeline_pm_power_one - Apply power change to an entity
* @entity: The entity
* @change: Use count change
*
* Change the entity use count by @change. If the entity is a subdev update its
* power state by calling the core::s_power operation when the use count goes
* from 0 to != 0 or from != 0 to 0.
*
* Return 0 on success or a negative error code on failure.
*/
static int pipeline_pm_power_one(struct media_entity *entity, int change)
{
struct v4l2_subdev *subdev;
int ret;
subdev = is_media_entity_v4l2_subdev(entity)
? media_entity_to_v4l2_subdev(entity) : NULL;
if (entity->use_count == 0 && change > 0 && subdev != NULL) {
ret = v4l2_subdev_call(subdev, core, s_power, 1);
if (ret < 0 && ret != -ENOIOCTLCMD)
return ret;
}
entity->use_count += change;
WARN_ON(entity->use_count < 0);
if (entity->use_count == 0 && change < 0 && subdev != NULL)
v4l2_subdev_call(subdev, core, s_power, 0);
return 0;
}
/*
* pipeline_pm_power - Apply power change to all entities in a pipeline
* @entity: The entity
* @change: Use count change
*
* Walk the pipeline to update the use count and the power state of all non-node
* entities.
*
* Return 0 on success or a negative error code on failure.
*/
static int pipeline_pm_power(struct media_entity *entity, int change,
struct media_graph *graph)
{
struct media_entity *first = entity;
int ret = 0;
if (!change)
return 0;
media_graph_walk_start(graph, entity);
while (!ret && (entity = media_graph_walk_next(graph)))
if (is_media_entity_v4l2_subdev(entity))
ret = pipeline_pm_power_one(entity, change);
if (!ret)
return ret;
media_graph_walk_start(graph, first);
while ((first = media_graph_walk_next(graph))
&& first != entity)
if (is_media_entity_v4l2_subdev(first))
pipeline_pm_power_one(first, -change);
return ret;
}
int v4l2_pipeline_pm_use(struct media_entity *entity, int use)
{
struct media_device *mdev = entity->graph_obj.mdev;
int change = use ? 1 : -1;
int ret;
mutex_lock(&mdev->graph_mutex);
/* Apply use count to node. */
entity->use_count += change;
WARN_ON(entity->use_count < 0);
/* Apply power change to connected non-nodes. */
ret = pipeline_pm_power(entity, change, &mdev->pm_count_walk);
if (ret < 0)
entity->use_count -= change;
mutex_unlock(&mdev->graph_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_pipeline_pm_use);
int v4l2_pipeline_link_notify(struct media_link *link, u32 flags,
unsigned int notification)
{
struct media_graph *graph = &link->graph_obj.mdev->pm_count_walk;
struct media_entity *source = link->source->entity;
struct media_entity *sink = link->sink->entity;
int source_use;
int sink_use;
int ret = 0;
source_use = pipeline_pm_use_count(source, graph);
sink_use = pipeline_pm_use_count(sink, graph);
if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
!(flags & MEDIA_LNK_FL_ENABLED)) {
/* Powering off entities is assumed to never fail. */
pipeline_pm_power(source, -sink_use, graph);
pipeline_pm_power(sink, -source_use, graph);
return 0;
}
if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH &&
(flags & MEDIA_LNK_FL_ENABLED)) {
ret = pipeline_pm_power(source, sink_use, graph);
if (ret < 0)
return ret;
ret = pipeline_pm_power(sink, source_use, graph);
if (ret < 0)
pipeline_pm_power(source, -sink_use, graph);
}
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_pipeline_link_notify);
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