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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2021-2022 Bootlin
* Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
*/
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include "sun6i_csi.h"
#include "sun6i_csi_bridge.h"
/* Helpers */
void sun6i_csi_bridge_dimensions(struct sun6i_csi_device *csi_dev,
unsigned int *width, unsigned int *height)
{
if (width)
*width = csi_dev->bridge.mbus_format.width;
if (height)
*height = csi_dev->bridge.mbus_format.height;
}
void sun6i_csi_bridge_format(struct sun6i_csi_device *csi_dev,
u32 *mbus_code, u32 *field)
{
if (mbus_code)
*mbus_code = csi_dev->bridge.mbus_format.code;
if (field)
*field = csi_dev->bridge.mbus_format.field;
}
/* Format */
static const u32 sun6i_csi_bridge_mbus_codes[] = {
/* Bayer */
MEDIA_BUS_FMT_SBGGR8_1X8,
MEDIA_BUS_FMT_SGBRG8_1X8,
MEDIA_BUS_FMT_SGRBG8_1X8,
MEDIA_BUS_FMT_SRGGB8_1X8,
MEDIA_BUS_FMT_SBGGR10_1X10,
MEDIA_BUS_FMT_SGBRG10_1X10,
MEDIA_BUS_FMT_SGRBG10_1X10,
MEDIA_BUS_FMT_SRGGB10_1X10,
MEDIA_BUS_FMT_SBGGR12_1X12,
MEDIA_BUS_FMT_SGBRG12_1X12,
MEDIA_BUS_FMT_SGRBG12_1X12,
MEDIA_BUS_FMT_SRGGB12_1X12,
/* RGB */
MEDIA_BUS_FMT_RGB565_2X8_LE,
MEDIA_BUS_FMT_RGB565_2X8_BE,
/* YUV422 */
MEDIA_BUS_FMT_YUYV8_2X8,
MEDIA_BUS_FMT_UYVY8_2X8,
MEDIA_BUS_FMT_YVYU8_2X8,
MEDIA_BUS_FMT_UYVY8_2X8,
MEDIA_BUS_FMT_VYUY8_2X8,
MEDIA_BUS_FMT_YUYV8_1X16,
MEDIA_BUS_FMT_UYVY8_1X16,
MEDIA_BUS_FMT_YVYU8_1X16,
MEDIA_BUS_FMT_UYVY8_1X16,
MEDIA_BUS_FMT_VYUY8_1X16,
/* Compressed */
MEDIA_BUS_FMT_JPEG_1X8,
};
static bool sun6i_csi_bridge_mbus_code_check(u32 mbus_code)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(sun6i_csi_bridge_mbus_codes); i++)
if (sun6i_csi_bridge_mbus_codes[i] == mbus_code)
return true;
return false;
}
/* V4L2 Subdev */
static int sun6i_csi_bridge_s_stream(struct v4l2_subdev *subdev, int on)
{
struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
struct sun6i_csi_bridge *bridge = &csi_dev->bridge;
struct media_pad *local_pad = &bridge->pads[SUN6I_CSI_BRIDGE_PAD_SINK];
struct device *dev = csi_dev->dev;
struct v4l2_subdev *source_subdev;
struct media_pad *remote_pad;
/* Initialize to 0 to use both in disable label (ret != 0) and off. */
int ret = 0;
/* Source */
remote_pad = media_pad_remote_pad_unique(local_pad);
if (IS_ERR(remote_pad)) {
dev_err(dev,
"zero or more than a single source connected to the bridge\n");
return PTR_ERR(remote_pad);
}
source_subdev = media_entity_to_v4l2_subdev(remote_pad->entity);
if (!on) {
v4l2_subdev_call(source_subdev, video, s_stream, 0);
goto disable;
}
ret = v4l2_subdev_call(source_subdev, video, s_stream, 1);
if (ret && ret != -ENOIOCTLCMD)
goto disable;
return 0;
disable:
return ret;
}
static const struct v4l2_subdev_video_ops sun6i_csi_bridge_video_ops = {
.s_stream = sun6i_csi_bridge_s_stream,
};
static void
sun6i_csi_bridge_mbus_format_prepare(struct v4l2_mbus_framefmt *mbus_format)
{
if (!sun6i_csi_bridge_mbus_code_check(mbus_format->code))
mbus_format->code = sun6i_csi_bridge_mbus_codes[0];
mbus_format->field = V4L2_FIELD_NONE;
mbus_format->colorspace = V4L2_COLORSPACE_RAW;
mbus_format->quantization = V4L2_QUANTIZATION_DEFAULT;
mbus_format->xfer_func = V4L2_XFER_FUNC_DEFAULT;
}
static int sun6i_csi_bridge_init_cfg(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *state)
{
struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
unsigned int pad = SUN6I_CSI_BRIDGE_PAD_SINK;
struct v4l2_mbus_framefmt *mbus_format =
v4l2_subdev_get_try_format(subdev, state, pad);
struct mutex *lock = &csi_dev->bridge.lock;
mutex_lock(lock);
mbus_format->code = sun6i_csi_bridge_mbus_codes[0];
mbus_format->width = 1280;
mbus_format->height = 720;
sun6i_csi_bridge_mbus_format_prepare(mbus_format);
mutex_unlock(lock);
return 0;
}
static int
sun6i_csi_bridge_enum_mbus_code(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *state,
struct v4l2_subdev_mbus_code_enum *code_enum)
{
if (code_enum->index >= ARRAY_SIZE(sun6i_csi_bridge_mbus_codes))
return -EINVAL;
code_enum->code = sun6i_csi_bridge_mbus_codes[code_enum->index];
return 0;
}
static int sun6i_csi_bridge_get_fmt(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
struct v4l2_mbus_framefmt *mbus_format = &format->format;
struct mutex *lock = &csi_dev->bridge.lock;
mutex_lock(lock);
if (format->which == V4L2_SUBDEV_FORMAT_TRY)
*mbus_format = *v4l2_subdev_get_try_format(subdev, state,
format->pad);
else
*mbus_format = csi_dev->bridge.mbus_format;
mutex_unlock(lock);
return 0;
}
static int sun6i_csi_bridge_set_fmt(struct v4l2_subdev *subdev,
struct v4l2_subdev_state *state,
struct v4l2_subdev_format *format)
{
struct sun6i_csi_device *csi_dev = v4l2_get_subdevdata(subdev);
struct v4l2_mbus_framefmt *mbus_format = &format->format;
struct mutex *lock = &csi_dev->bridge.lock;
mutex_lock(lock);
sun6i_csi_bridge_mbus_format_prepare(mbus_format);
if (format->which == V4L2_SUBDEV_FORMAT_TRY)
*v4l2_subdev_get_try_format(subdev, state, format->pad) =
*mbus_format;
else
csi_dev->bridge.mbus_format = *mbus_format;
mutex_unlock(lock);
return 0;
}
static const struct v4l2_subdev_pad_ops sun6i_csi_bridge_pad_ops = {
.init_cfg = sun6i_csi_bridge_init_cfg,
.enum_mbus_code = sun6i_csi_bridge_enum_mbus_code,
.get_fmt = sun6i_csi_bridge_get_fmt,
.set_fmt = sun6i_csi_bridge_set_fmt,
};
const struct v4l2_subdev_ops sun6i_csi_bridge_subdev_ops = {
.video = &sun6i_csi_bridge_video_ops,
.pad = &sun6i_csi_bridge_pad_ops,
};
/* Media Entity */
static const struct media_entity_operations sun6i_csi_bridge_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
/* V4L2 Async */
static int sun6i_csi_bridge_link(struct sun6i_csi_device *csi_dev,
int sink_pad_index,
struct v4l2_subdev *remote_subdev,
bool enabled)
{
struct device *dev = csi_dev->dev;
struct v4l2_subdev *subdev = &csi_dev->bridge.subdev;
struct media_entity *sink_entity = &subdev->entity;
struct media_entity *source_entity = &remote_subdev->entity;
int source_pad_index;
int ret;
/* Get the first remote source pad. */
ret = media_entity_get_fwnode_pad(source_entity, remote_subdev->fwnode,
MEDIA_PAD_FL_SOURCE);
if (ret < 0) {
dev_err(dev, "missing source pad in external entity %s\n",
source_entity->name);
return -EINVAL;
}
source_pad_index = ret;
dev_dbg(dev, "creating %s:%u -> %s:%u link\n", source_entity->name,
source_pad_index, sink_entity->name, sink_pad_index);
ret = media_create_pad_link(source_entity, source_pad_index,
sink_entity, sink_pad_index,
enabled ? MEDIA_LNK_FL_ENABLED : 0);
if (ret < 0) {
dev_err(dev, "failed to create %s:%u -> %s:%u link\n",
source_entity->name, source_pad_index,
sink_entity->name, sink_pad_index);
return ret;
}
return 0;
}
static int
sun6i_csi_bridge_notifier_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *remote_subdev,
struct v4l2_async_subdev *async_subdev)
{
struct sun6i_csi_device *csi_dev =
container_of(notifier, struct sun6i_csi_device,
bridge.notifier);
struct sun6i_csi_bridge_async_subdev *bridge_async_subdev =
container_of(async_subdev, struct sun6i_csi_bridge_async_subdev,
async_subdev);
struct sun6i_csi_bridge_source *source = bridge_async_subdev->source;
bool enabled;
switch (source->endpoint.base.port) {
case SUN6I_CSI_PORT_PARALLEL:
enabled = true;
break;
default:
break;
}
source->subdev = remote_subdev;
return sun6i_csi_bridge_link(csi_dev, SUN6I_CSI_BRIDGE_PAD_SINK,
remote_subdev, enabled);
}
static int
sun6i_csi_bridge_notifier_complete(struct v4l2_async_notifier *notifier)
{
struct sun6i_csi_device *csi_dev =
container_of(notifier, struct sun6i_csi_device,
bridge.notifier);
struct v4l2_device *v4l2_dev = &csi_dev->v4l2.v4l2_dev;
return v4l2_device_register_subdev_nodes(v4l2_dev);
}
static const struct v4l2_async_notifier_operations
sun6i_csi_bridge_notifier_ops = {
.bound = sun6i_csi_bridge_notifier_bound,
.complete = sun6i_csi_bridge_notifier_complete,
};
/* Bridge */
static int sun6i_csi_bridge_source_setup(struct sun6i_csi_device *csi_dev,
struct sun6i_csi_bridge_source *source,
u32 port,
enum v4l2_mbus_type *bus_types)
{
struct device *dev = csi_dev->dev;
struct v4l2_async_notifier *notifier = &csi_dev->bridge.notifier;
struct v4l2_fwnode_endpoint *endpoint = &source->endpoint;
struct sun6i_csi_bridge_async_subdev *bridge_async_subdev;
struct fwnode_handle *handle;
int ret;
handle = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), port, 0, 0);
if (!handle)
return -ENODEV;
ret = v4l2_fwnode_endpoint_parse(handle, endpoint);
if (ret)
goto complete;
if (bus_types) {
bool valid = false;
unsigned int i;
for (i = 0; bus_types[i] != V4L2_MBUS_INVALID; i++) {
if (endpoint->bus_type == bus_types[i]) {
valid = true;
break;
}
}
if (!valid) {
dev_err(dev, "unsupported bus type for port %d\n",
port);
ret = -EINVAL;
goto complete;
}
}
bridge_async_subdev =
v4l2_async_nf_add_fwnode_remote(notifier, handle,
struct
sun6i_csi_bridge_async_subdev);
if (IS_ERR(bridge_async_subdev)) {
ret = PTR_ERR(bridge_async_subdev);
goto complete;
}
bridge_async_subdev->source = source;
source->expected = true;
complete:
fwnode_handle_put(handle);
return ret;
}
int sun6i_csi_bridge_setup(struct sun6i_csi_device *csi_dev)
{
struct device *dev = csi_dev->dev;
struct sun6i_csi_bridge *bridge = &csi_dev->bridge;
struct v4l2_device *v4l2_dev = &csi_dev->v4l2.v4l2_dev;
struct v4l2_subdev *subdev = &bridge->subdev;
struct v4l2_async_notifier *notifier = &bridge->notifier;
struct media_pad *pads = bridge->pads;
enum v4l2_mbus_type parallel_mbus_types[] = {
V4L2_MBUS_PARALLEL,
V4L2_MBUS_BT656,
V4L2_MBUS_INVALID
};
int ret;
mutex_init(&bridge->lock);
/* V4L2 Subdev */
v4l2_subdev_init(subdev, &sun6i_csi_bridge_subdev_ops);
strscpy(subdev->name, SUN6I_CSI_BRIDGE_NAME, sizeof(subdev->name));
subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
subdev->owner = THIS_MODULE;
subdev->dev = dev;
v4l2_set_subdevdata(subdev, csi_dev);
/* Media Entity */
subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
subdev->entity.ops = &sun6i_csi_bridge_entity_ops;
/* Media Pads */
pads[SUN6I_CSI_BRIDGE_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
pads[SUN6I_CSI_BRIDGE_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE |
MEDIA_PAD_FL_MUST_CONNECT;
ret = media_entity_pads_init(&subdev->entity,
SUN6I_CSI_BRIDGE_PAD_COUNT, pads);
if (ret < 0)
return ret;
/* V4L2 Subdev */
ret = v4l2_device_register_subdev(v4l2_dev, subdev);
if (ret) {
dev_err(dev, "failed to register v4l2 subdev: %d\n", ret);
goto error_media_entity;
}
/* V4L2 Async */
v4l2_async_nf_init(notifier);
notifier->ops = &sun6i_csi_bridge_notifier_ops;
sun6i_csi_bridge_source_setup(csi_dev, &bridge->source_parallel,
SUN6I_CSI_PORT_PARALLEL,
parallel_mbus_types);
ret = v4l2_async_nf_register(v4l2_dev, notifier);
if (ret) {
dev_err(dev, "failed to register v4l2 async notifier: %d\n",
ret);
goto error_v4l2_async_notifier;
}
return 0;
error_v4l2_async_notifier:
v4l2_async_nf_cleanup(notifier);
v4l2_device_unregister_subdev(subdev);
error_media_entity:
media_entity_cleanup(&subdev->entity);
return ret;
}
void sun6i_csi_bridge_cleanup(struct sun6i_csi_device *csi_dev)
{
struct v4l2_subdev *subdev = &csi_dev->bridge.subdev;
struct v4l2_async_notifier *notifier = &csi_dev->bridge.notifier;
v4l2_async_nf_unregister(notifier);
v4l2_async_nf_cleanup(notifier);
v4l2_device_unregister_subdev(subdev);
media_entity_cleanup(&subdev->entity);
}
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