Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 893 insertions, 0 deletions

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
new file mode 100644
index 000000000..fbf0dcb31
--- /dev/null
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -0,0 +1,893 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * V4L2 sub-device
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *	    Sakari Ailus <sakari.ailus@iki.fi>
+ */
+
+#include <linux/ioctl.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/videodev2.h>
+#include <linux/export.h>
+#include <linux/version.h>
+
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-event.h>
+
+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
+static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
+{
+	if (sd->entity.num_pads) {
+		fh->pad = v4l2_subdev_alloc_pad_config(sd);
+		if (fh->pad == NULL)
+			return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void subdev_fh_free(struct v4l2_subdev_fh *fh)
+{
+	v4l2_subdev_free_pad_config(fh->pad);
+	fh->pad = NULL;
+}
+
+static int subdev_open(struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+	struct v4l2_subdev_fh *subdev_fh;
+	int ret;
+
+	subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
+	if (subdev_fh == NULL)
+		return -ENOMEM;
+
+	ret = subdev_fh_init(subdev_fh, sd);
+	if (ret) {
+		kfree(subdev_fh);
+		return ret;
+	}
+
+	v4l2_fh_init(&subdev_fh->vfh, vdev);
+	v4l2_fh_add(&subdev_fh->vfh);
+	file->private_data = &subdev_fh->vfh;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	if (sd->v4l2_dev->mdev && sd->entity.graph_obj.mdev->dev) {
+		struct module *owner;
+
+		owner = sd->entity.graph_obj.mdev->dev->driver->owner;
+		if (!try_module_get(owner)) {
+			ret = -EBUSY;
+			goto err;
+		}
+		subdev_fh->owner = owner;
+	}
+#endif
+
+	if (sd->internal_ops && sd->internal_ops->open) {
+		ret = sd->internal_ops->open(sd, subdev_fh);
+		if (ret < 0)
+			goto err;
+	}
+
+	return 0;
+
+err:
+	module_put(subdev_fh->owner);
+	v4l2_fh_del(&subdev_fh->vfh);
+	v4l2_fh_exit(&subdev_fh->vfh);
+	subdev_fh_free(subdev_fh);
+	kfree(subdev_fh);
+
+	return ret;
+}
+
+static int subdev_close(struct file *file)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+	struct v4l2_fh *vfh = file->private_data;
+	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
+
+	if (sd->internal_ops && sd->internal_ops->close)
+		sd->internal_ops->close(sd, subdev_fh);
+	module_put(subdev_fh->owner);
+	v4l2_fh_del(vfh);
+	v4l2_fh_exit(vfh);
+	subdev_fh_free(subdev_fh);
+	kfree(subdev_fh);
+	file->private_data = NULL;
+
+	return 0;
+}
+#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
+static int subdev_open(struct file *file)
+{
+	return -ENODEV;
+}
+
+static int subdev_close(struct file *file)
+{
+	return -ENODEV;
+}
+#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
+
+static inline int check_which(u32 which)
+{
+	if (which != V4L2_SUBDEV_FORMAT_TRY &&
+	    which != V4L2_SUBDEV_FORMAT_ACTIVE)
+		return -EINVAL;
+
+	return 0;
+}
+
+static inline int check_pad(struct v4l2_subdev *sd, u32 pad)
+{
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	if (sd->entity.num_pads) {
+		if (pad >= sd->entity.num_pads)
+			return -EINVAL;
+		return 0;
+	}
+#endif
+	/* allow pad 0 on subdevices not registered as media entities */
+	if (pad > 0)
+		return -EINVAL;
+	return 0;
+}
+
+static int check_cfg(u32 which, struct v4l2_subdev_pad_config *cfg)
+{
+	if (which == V4L2_SUBDEV_FORMAT_TRY && !cfg)
+		return -EINVAL;
+
+	return 0;
+}
+
+static inline int check_format(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_pad_config *cfg,
+			       struct v4l2_subdev_format *format)
+{
+	if (!format)
+		return -EINVAL;
+
+	return check_which(format->which) ? : check_pad(sd, format->pad) ? :
+	       check_cfg(format->which, cfg);
+}
+
+static int call_get_fmt(struct v4l2_subdev *sd,
+			struct v4l2_subdev_pad_config *cfg,
+			struct v4l2_subdev_format *format)
+{
+	return check_format(sd, cfg, format) ? :
+	       sd->ops->pad->get_fmt(sd, cfg, format);
+}
+
+static int call_set_fmt(struct v4l2_subdev *sd,
+			struct v4l2_subdev_pad_config *cfg,
+			struct v4l2_subdev_format *format)
+{
+	return check_format(sd, cfg, format) ? :
+	       sd->ops->pad->set_fmt(sd, cfg, format);
+}
+
+static int call_enum_mbus_code(struct v4l2_subdev *sd,
+			       struct v4l2_subdev_pad_config *cfg,
+			       struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (!code)
+		return -EINVAL;
+
+	return check_which(code->which) ? : check_pad(sd, code->pad) ? :
+	       check_cfg(code->which, cfg) ? :
+	       sd->ops->pad->enum_mbus_code(sd, cfg, code);
+}
+
+static int call_enum_frame_size(struct v4l2_subdev *sd,
+				struct v4l2_subdev_pad_config *cfg,
+				struct v4l2_subdev_frame_size_enum *fse)
+{
+	if (!fse)
+		return -EINVAL;
+
+	return check_which(fse->which) ? : check_pad(sd, fse->pad) ? :
+	       check_cfg(fse->which, cfg) ? :
+	       sd->ops->pad->enum_frame_size(sd, cfg, fse);
+}
+
+static inline int check_frame_interval(struct v4l2_subdev *sd,
+				       struct v4l2_subdev_frame_interval *fi)
+{
+	if (!fi)
+		return -EINVAL;
+
+	return check_pad(sd, fi->pad);
+}
+
+static int call_g_frame_interval(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_frame_interval *fi)
+{
+	return check_frame_interval(sd, fi) ? :
+	       sd->ops->video->g_frame_interval(sd, fi);
+}
+
+static int call_s_frame_interval(struct v4l2_subdev *sd,
+				 struct v4l2_subdev_frame_interval *fi)
+{
+	return check_frame_interval(sd, fi) ? :
+	       sd->ops->video->s_frame_interval(sd, fi);
+}
+
+static int call_enum_frame_interval(struct v4l2_subdev *sd,
+				    struct v4l2_subdev_pad_config *cfg,
+				    struct v4l2_subdev_frame_interval_enum *fie)
+{
+	if (!fie)
+		return -EINVAL;
+
+	return check_which(fie->which) ? : check_pad(sd, fie->pad) ? :
+	       check_cfg(fie->which, cfg) ? :
+	       sd->ops->pad->enum_frame_interval(sd, cfg, fie);
+}
+
+static inline int check_selection(struct v4l2_subdev *sd,
+				  struct v4l2_subdev_pad_config *cfg,
+				  struct v4l2_subdev_selection *sel)
+{
+	if (!sel)
+		return -EINVAL;
+
+	return check_which(sel->which) ? : check_pad(sd, sel->pad) ? :
+	       check_cfg(sel->which, cfg);
+}
+
+static int call_get_selection(struct v4l2_subdev *sd,
+			      struct v4l2_subdev_pad_config *cfg,
+			      struct v4l2_subdev_selection *sel)
+{
+	return check_selection(sd, cfg, sel) ? :
+	       sd->ops->pad->get_selection(sd, cfg, sel);
+}
+
+static int call_set_selection(struct v4l2_subdev *sd,
+			      struct v4l2_subdev_pad_config *cfg,
+			      struct v4l2_subdev_selection *sel)
+{
+	return check_selection(sd, cfg, sel) ? :
+	       sd->ops->pad->set_selection(sd, cfg, sel);
+}
+
+static inline int check_edid(struct v4l2_subdev *sd,
+			     struct v4l2_subdev_edid *edid)
+{
+	if (!edid)
+		return -EINVAL;
+
+	if (edid->blocks && edid->edid == NULL)
+		return -EINVAL;
+
+	return check_pad(sd, edid->pad);
+}
+
+static int call_get_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
+{
+	return check_edid(sd, edid) ? : sd->ops->pad->get_edid(sd, edid);
+}
+
+static int call_set_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
+{
+	return check_edid(sd, edid) ? : sd->ops->pad->set_edid(sd, edid);
+}
+
+static int call_dv_timings_cap(struct v4l2_subdev *sd,
+			       struct v4l2_dv_timings_cap *cap)
+{
+	if (!cap)
+		return -EINVAL;
+
+	return check_pad(sd, cap->pad) ? :
+	       sd->ops->pad->dv_timings_cap(sd, cap);
+}
+
+static int call_enum_dv_timings(struct v4l2_subdev *sd,
+				struct v4l2_enum_dv_timings *dvt)
+{
+	if (!dvt)
+		return -EINVAL;
+
+	return check_pad(sd, dvt->pad) ? :
+	       sd->ops->pad->enum_dv_timings(sd, dvt);
+}
+
+static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
+				struct v4l2_mbus_config *config)
+{
+	return check_pad(sd, pad) ? :
+	       sd->ops->pad->get_mbus_config(sd, pad, config);
+}
+
+static int call_set_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
+				struct v4l2_mbus_config *config)
+{
+	return check_pad(sd, pad) ? :
+	       sd->ops->pad->get_mbus_config(sd, pad, config);
+}
+
+static const struct v4l2_subdev_pad_ops v4l2_subdev_call_pad_wrappers = {
+	.get_fmt		= call_get_fmt,
+	.set_fmt		= call_set_fmt,
+	.enum_mbus_code		= call_enum_mbus_code,
+	.enum_frame_size	= call_enum_frame_size,
+	.enum_frame_interval	= call_enum_frame_interval,
+	.get_selection		= call_get_selection,
+	.set_selection		= call_set_selection,
+	.get_edid		= call_get_edid,
+	.set_edid		= call_set_edid,
+	.dv_timings_cap		= call_dv_timings_cap,
+	.enum_dv_timings	= call_enum_dv_timings,
+	.get_mbus_config	= call_get_mbus_config,
+	.set_mbus_config	= call_set_mbus_config,
+};
+
+static const struct v4l2_subdev_video_ops v4l2_subdev_call_video_wrappers = {
+	.g_frame_interval	= call_g_frame_interval,
+	.s_frame_interval	= call_s_frame_interval,
+};
+
+const struct v4l2_subdev_ops v4l2_subdev_call_wrappers = {
+	.pad	= &v4l2_subdev_call_pad_wrappers,
+	.video	= &v4l2_subdev_call_video_wrappers,
+};
+EXPORT_SYMBOL(v4l2_subdev_call_wrappers);
+
+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
+static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+	struct v4l2_fh *vfh = file->private_data;
+	struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
+	bool ro_subdev = test_bit(V4L2_FL_SUBDEV_RO_DEVNODE, &vdev->flags);
+	int rval;
+
+	switch (cmd) {
+	case VIDIOC_SUBDEV_QUERYCAP: {
+		struct v4l2_subdev_capability *cap = arg;
+
+		memset(cap->reserved, 0, sizeof(cap->reserved));
+		cap->version = LINUX_VERSION_CODE;
+		cap->capabilities = ro_subdev ? V4L2_SUBDEV_CAP_RO_SUBDEV : 0;
+
+		return 0;
+	}
+
+	case VIDIOC_QUERYCTRL:
+		/*
+		 * TODO: this really should be folded into v4l2_queryctrl (this
+		 * currently returns -EINVAL for NULL control handlers).
+		 * However, v4l2_queryctrl() is still called directly by
+		 * drivers as well and until that has been addressed I believe
+		 * it is safer to do the check here. The same is true for the
+		 * other control ioctls below.
+		 */
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_queryctrl(vfh->ctrl_handler, arg);
+
+	case VIDIOC_QUERY_EXT_CTRL:
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
+
+	case VIDIOC_QUERYMENU:
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_querymenu(vfh->ctrl_handler, arg);
+
+	case VIDIOC_G_CTRL:
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_g_ctrl(vfh->ctrl_handler, arg);
+
+	case VIDIOC_S_CTRL:
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
+
+	case VIDIOC_G_EXT_CTRLS:
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_g_ext_ctrls(vfh->ctrl_handler,
+					vdev, sd->v4l2_dev->mdev, arg);
+
+	case VIDIOC_S_EXT_CTRLS:
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler,
+					vdev, sd->v4l2_dev->mdev, arg);
+
+	case VIDIOC_TRY_EXT_CTRLS:
+		if (!vfh->ctrl_handler)
+			return -ENOTTY;
+		return v4l2_try_ext_ctrls(vfh->ctrl_handler,
+					  vdev, sd->v4l2_dev->mdev, arg);
+
+	case VIDIOC_DQEVENT:
+		if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
+			return -ENOIOCTLCMD;
+
+		return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
+
+	case VIDIOC_SUBSCRIBE_EVENT:
+		return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
+
+	case VIDIOC_UNSUBSCRIBE_EVENT:
+		return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	case VIDIOC_DBG_G_REGISTER:
+	{
+		struct v4l2_dbg_register *p = arg;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+		return v4l2_subdev_call(sd, core, g_register, p);
+	}
+	case VIDIOC_DBG_S_REGISTER:
+	{
+		struct v4l2_dbg_register *p = arg;
+
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+		return v4l2_subdev_call(sd, core, s_register, p);
+	}
+	case VIDIOC_DBG_G_CHIP_INFO:
+	{
+		struct v4l2_dbg_chip_info *p = arg;
+
+		if (p->match.type != V4L2_CHIP_MATCH_SUBDEV || p->match.addr)
+			return -EINVAL;
+		if (sd->ops->core && sd->ops->core->s_register)
+			p->flags |= V4L2_CHIP_FL_WRITABLE;
+		if (sd->ops->core && sd->ops->core->g_register)
+			p->flags |= V4L2_CHIP_FL_READABLE;
+		strscpy(p->name, sd->name, sizeof(p->name));
+		return 0;
+	}
+#endif
+
+	case VIDIOC_LOG_STATUS: {
+		int ret;
+
+		pr_info("%s: =================  START STATUS  =================\n",
+			sd->name);
+		ret = v4l2_subdev_call(sd, core, log_status);
+		pr_info("%s: ==================  END STATUS  ==================\n",
+			sd->name);
+		return ret;
+	}
+
+	case VIDIOC_SUBDEV_G_FMT: {
+		struct v4l2_subdev_format *format = arg;
+
+		memset(format->reserved, 0, sizeof(format->reserved));
+		memset(format->format.reserved, 0, sizeof(format->format.reserved));
+		return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh->pad, format);
+	}
+
+	case VIDIOC_SUBDEV_S_FMT: {
+		struct v4l2_subdev_format *format = arg;
+
+		if (format->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
+			return -EPERM;
+
+		memset(format->reserved, 0, sizeof(format->reserved));
+		memset(format->format.reserved, 0, sizeof(format->format.reserved));
+		return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh->pad, format);
+	}
+
+	case VIDIOC_SUBDEV_G_CROP: {
+		struct v4l2_subdev_crop *crop = arg;
+		struct v4l2_subdev_selection sel;
+
+		memset(crop->reserved, 0, sizeof(crop->reserved));
+		memset(&sel, 0, sizeof(sel));
+		sel.which = crop->which;
+		sel.pad = crop->pad;
+		sel.target = V4L2_SEL_TGT_CROP;
+
+		rval = v4l2_subdev_call(
+			sd, pad, get_selection, subdev_fh->pad, &sel);
+
+		crop->rect = sel.r;
+
+		return rval;
+	}
+
+	case VIDIOC_SUBDEV_S_CROP: {
+		struct v4l2_subdev_crop *crop = arg;
+		struct v4l2_subdev_selection sel;
+
+		if (crop->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
+			return -EPERM;
+
+		memset(crop->reserved, 0, sizeof(crop->reserved));
+		memset(&sel, 0, sizeof(sel));
+		sel.which = crop->which;
+		sel.pad = crop->pad;
+		sel.target = V4L2_SEL_TGT_CROP;
+		sel.r = crop->rect;
+
+		rval = v4l2_subdev_call(
+			sd, pad, set_selection, subdev_fh->pad, &sel);
+
+		crop->rect = sel.r;
+
+		return rval;
+	}
+
+	case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
+		struct v4l2_subdev_mbus_code_enum *code = arg;
+
+		memset(code->reserved, 0, sizeof(code->reserved));
+		return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh->pad,
+					code);
+	}
+
+	case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
+		struct v4l2_subdev_frame_size_enum *fse = arg;
+
+		memset(fse->reserved, 0, sizeof(fse->reserved));
+		return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh->pad,
+					fse);
+	}
+
+	case VIDIOC_SUBDEV_G_FRAME_INTERVAL: {
+		struct v4l2_subdev_frame_interval *fi = arg;
+
+		memset(fi->reserved, 0, sizeof(fi->reserved));
+		return v4l2_subdev_call(sd, video, g_frame_interval, arg);
+	}
+
+	case VIDIOC_SUBDEV_S_FRAME_INTERVAL: {
+		struct v4l2_subdev_frame_interval *fi = arg;
+
+		if (ro_subdev)
+			return -EPERM;
+
+		memset(fi->reserved, 0, sizeof(fi->reserved));
+		return v4l2_subdev_call(sd, video, s_frame_interval, arg);
+	}
+
+	case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
+		struct v4l2_subdev_frame_interval_enum *fie = arg;
+
+		memset(fie->reserved, 0, sizeof(fie->reserved));
+		return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh->pad,
+					fie);
+	}
+
+	case VIDIOC_SUBDEV_G_SELECTION: {
+		struct v4l2_subdev_selection *sel = arg;
+
+		memset(sel->reserved, 0, sizeof(sel->reserved));
+		return v4l2_subdev_call(
+			sd, pad, get_selection, subdev_fh->pad, sel);
+	}
+
+	case VIDIOC_SUBDEV_S_SELECTION: {
+		struct v4l2_subdev_selection *sel = arg;
+
+		if (sel->which != V4L2_SUBDEV_FORMAT_TRY && ro_subdev)
+			return -EPERM;
+
+		memset(sel->reserved, 0, sizeof(sel->reserved));
+		return v4l2_subdev_call(
+			sd, pad, set_selection, subdev_fh->pad, sel);
+	}
+
+	case VIDIOC_G_EDID: {
+		struct v4l2_subdev_edid *edid = arg;
+
+		return v4l2_subdev_call(sd, pad, get_edid, edid);
+	}
+
+	case VIDIOC_S_EDID: {
+		struct v4l2_subdev_edid *edid = arg;
+
+		return v4l2_subdev_call(sd, pad, set_edid, edid);
+	}
+
+	case VIDIOC_SUBDEV_DV_TIMINGS_CAP: {
+		struct v4l2_dv_timings_cap *cap = arg;
+
+		return v4l2_subdev_call(sd, pad, dv_timings_cap, cap);
+	}
+
+	case VIDIOC_SUBDEV_ENUM_DV_TIMINGS: {
+		struct v4l2_enum_dv_timings *dvt = arg;
+
+		return v4l2_subdev_call(sd, pad, enum_dv_timings, dvt);
+	}
+
+	case VIDIOC_SUBDEV_QUERY_DV_TIMINGS:
+		return v4l2_subdev_call(sd, video, query_dv_timings, arg);
+
+	case VIDIOC_SUBDEV_G_DV_TIMINGS:
+		return v4l2_subdev_call(sd, video, g_dv_timings, arg);
+
+	case VIDIOC_SUBDEV_S_DV_TIMINGS:
+		if (ro_subdev)
+			return -EPERM;
+
+		return v4l2_subdev_call(sd, video, s_dv_timings, arg);
+
+	case VIDIOC_SUBDEV_G_STD:
+		return v4l2_subdev_call(sd, video, g_std, arg);
+
+	case VIDIOC_SUBDEV_S_STD: {
+		v4l2_std_id *std = arg;
+
+		if (ro_subdev)
+			return -EPERM;
+
+		return v4l2_subdev_call(sd, video, s_std, *std);
+	}
+
+	case VIDIOC_SUBDEV_ENUMSTD: {
+		struct v4l2_standard *p = arg;
+		v4l2_std_id id;
+
+		if (v4l2_subdev_call(sd, video, g_tvnorms, &id))
+			return -EINVAL;
+
+		return v4l_video_std_enumstd(p, id);
+	}
+
+	case VIDIOC_SUBDEV_QUERYSTD:
+		return v4l2_subdev_call(sd, video, querystd, arg);
+
+	default:
+		return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
+	}
+
+	return 0;
+}
+
+static long subdev_do_ioctl_lock(struct file *file, unsigned int cmd, void *arg)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct mutex *lock = vdev->lock;
+	long ret = -ENODEV;
+
+	if (lock && mutex_lock_interruptible(lock))
+		return -ERESTARTSYS;
+	if (video_is_registered(vdev))
+		ret = subdev_do_ioctl(file, cmd, arg);
+	if (lock)
+		mutex_unlock(lock);
+	return ret;
+}
+
+static long subdev_ioctl(struct file *file, unsigned int cmd,
+	unsigned long arg)
+{
+	return video_usercopy(file, cmd, arg, subdev_do_ioctl_lock);
+}
+
+#ifdef CONFIG_COMPAT
+static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
+	unsigned long arg)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+
+	return v4l2_subdev_call(sd, core, compat_ioctl32, cmd, arg);
+}
+#endif
+
+#else /* CONFIG_VIDEO_V4L2_SUBDEV_API */
+static long subdev_ioctl(struct file *file, unsigned int cmd,
+			 unsigned long arg)
+{
+	return -ENODEV;
+}
+
+#ifdef CONFIG_COMPAT
+static long subdev_compat_ioctl32(struct file *file, unsigned int cmd,
+				  unsigned long arg)
+{
+	return -ENODEV;
+}
+#endif
+#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
+
+static __poll_t subdev_poll(struct file *file, poll_table *wait)
+{
+	struct video_device *vdev = video_devdata(file);
+	struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
+	struct v4l2_fh *fh = file->private_data;
+
+	if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
+		return EPOLLERR;
+
+	poll_wait(file, &fh->wait, wait);
+
+	if (v4l2_event_pending(fh))
+		return EPOLLPRI;
+
+	return 0;
+}
+
+const struct v4l2_file_operations v4l2_subdev_fops = {
+	.owner = THIS_MODULE,
+	.open = subdev_open,
+	.unlocked_ioctl = subdev_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl32 = subdev_compat_ioctl32,
+#endif
+	.release = subdev_close,
+	.poll = subdev_poll,
+};
+
+#ifdef CONFIG_MEDIA_CONTROLLER
+
+int v4l2_subdev_get_fwnode_pad_1_to_1(struct media_entity *entity,
+				      struct fwnode_endpoint *endpoint)
+{
+	struct fwnode_handle *fwnode;
+	struct v4l2_subdev *sd;
+
+	if (!is_media_entity_v4l2_subdev(entity))
+		return -EINVAL;
+
+	sd = media_entity_to_v4l2_subdev(entity);
+
+	fwnode = fwnode_graph_get_port_parent(endpoint->local_fwnode);
+	fwnode_handle_put(fwnode);
+
+	if (dev_fwnode(sd->dev) == fwnode)
+		return endpoint->port;
+
+	return -ENXIO;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_get_fwnode_pad_1_to_1);
+
+int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
+				      struct media_link *link,
+				      struct v4l2_subdev_format *source_fmt,
+				      struct v4l2_subdev_format *sink_fmt)
+{
+	/* The width, height and code must match. */
+	if (source_fmt->format.width != sink_fmt->format.width
+	    || source_fmt->format.height != sink_fmt->format.height
+	    || source_fmt->format.code != sink_fmt->format.code)
+		return -EPIPE;
+
+	/* The field order must match, or the sink field order must be NONE
+	 * to support interlaced hardware connected to bridges that support
+	 * progressive formats only.
+	 */
+	if (source_fmt->format.field != sink_fmt->format.field &&
+	    sink_fmt->format.field != V4L2_FIELD_NONE)
+		return -EPIPE;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default);
+
+static int
+v4l2_subdev_link_validate_get_format(struct media_pad *pad,
+				     struct v4l2_subdev_format *fmt)
+{
+	if (is_media_entity_v4l2_subdev(pad->entity)) {
+		struct v4l2_subdev *sd =
+			media_entity_to_v4l2_subdev(pad->entity);
+
+		fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
+		fmt->pad = pad->index;
+		return v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
+	}
+
+	WARN(pad->entity->function != MEDIA_ENT_F_IO_V4L,
+	     "Driver bug! Wrong media entity type 0x%08x, entity %s\n",
+	     pad->entity->function, pad->entity->name);
+
+	return -EINVAL;
+}
+
+int v4l2_subdev_link_validate(struct media_link *link)
+{
+	struct v4l2_subdev *sink;
+	struct v4l2_subdev_format sink_fmt, source_fmt;
+	int rval;
+
+	rval = v4l2_subdev_link_validate_get_format(
+		link->source, &source_fmt);
+	if (rval < 0)
+		return 0;
+
+	rval = v4l2_subdev_link_validate_get_format(
+		link->sink, &sink_fmt);
+	if (rval < 0)
+		return 0;
+
+	sink = media_entity_to_v4l2_subdev(link->sink->entity);
+
+	rval = v4l2_subdev_call(sink, pad, link_validate, link,
+				&source_fmt, &sink_fmt);
+	if (rval != -ENOIOCTLCMD)
+		return rval;
+
+	return v4l2_subdev_link_validate_default(
+		sink, link, &source_fmt, &sink_fmt);
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
+
+struct v4l2_subdev_pad_config *
+v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd)
+{
+	struct v4l2_subdev_pad_config *cfg;
+	int ret;
+
+	if (!sd->entity.num_pads)
+		return NULL;
+
+	cfg = kvmalloc_array(sd->entity.num_pads, sizeof(*cfg),
+			     GFP_KERNEL | __GFP_ZERO);
+	if (!cfg)
+		return NULL;
+
+	ret = v4l2_subdev_call(sd, pad, init_cfg, cfg);
+	if (ret < 0 && ret != -ENOIOCTLCMD) {
+		kvfree(cfg);
+		return NULL;
+	}
+
+	return cfg;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config);
+
+void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg)
+{
+	kvfree(cfg);
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config);
+#endif /* CONFIG_MEDIA_CONTROLLER */
+
+void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
+{
+	INIT_LIST_HEAD(&sd->list);
+	BUG_ON(!ops);
+	sd->ops = ops;
+	sd->v4l2_dev = NULL;
+	sd->flags = 0;
+	sd->name[0] = '\0';
+	sd->grp_id = 0;
+	sd->dev_priv = NULL;
+	sd->host_priv = NULL;
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	sd->entity.name = sd->name;
+	sd->entity.obj_type = MEDIA_ENTITY_TYPE_V4L2_SUBDEV;
+	sd->entity.function = MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN;
+#endif
+}
+EXPORT_SYMBOL(v4l2_subdev_init);
+
+void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
+			      const struct v4l2_event *ev)
+{
+	v4l2_event_queue(sd->devnode, ev);
+	v4l2_subdev_notify(sd, V4L2_DEVICE_NOTIFY_EVENT, (void *)ev);
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);