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2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 
 kernel/include/media/v4l2-device.h
....@@ -1,21 +1,9 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23     V4L2 device support header.
34 
45     Copyright (C) 2008  Hans Verkuil <hverkuil@xs4all.nl>
56 
6
-    This program is free software; you can redistribute it and/or modify
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-    it under the terms of the GNU General Public License as published by
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-    the Free Software Foundation; either version 2 of the License, or
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-    (at your option) any later version.
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-
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-    This program is distributed in the hope that it will be useful,
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-    but WITHOUT ANY WARRANTY; without even the implied warranty of
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-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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-    GNU General Public License for more details.
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-
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-    You should have received a copy of the GNU General Public License
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-    along with this program; if not, write to the Free Software
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-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
197  */
208 
219 #ifndef _V4L2_DEVICE_H
....@@ -84,7 +72,7 @@
8472 }
8573 
8674 /**
87
- * v4l2_device_put - putss a V4L2 device reference
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+ * v4l2_device_put - puts a V4L2 device reference
8876  *
8977  * @v4l2_dev: pointer to struct &v4l2_device
9078  *
....@@ -186,14 +174,56 @@
186174 void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
187175 
188176 /**
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- * v4l2_device_register_subdev_nodes - Registers device nodes for all subdevs
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- *	of the v4l2 device that are marked with
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- *	the %V4L2_SUBDEV_FL_HAS_DEVNODE flag.
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+ * __v4l2_device_register_ro_subdev_nodes - Registers device nodes for
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+ *      all subdevs of the v4l2 device that are marked with the
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+ *      %V4L2_SUBDEV_FL_HAS_DEVNODE flag.
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+ *
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+ * @v4l2_dev: pointer to struct v4l2_device
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+ * @read_only: subdevices read-only flag. True to register the subdevices
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+ *	device nodes in read-only mode, false to allow full access to the
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+ *	subdevice userspace API.
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+ */
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+int __must_check
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+__v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev,
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+				    bool read_only);
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+
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+/**
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+ * v4l2_device_register_subdev_nodes - Registers subdevices device nodes with
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+ *	unrestricted access to the subdevice userspace operations
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+ *
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+ * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation
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+ * for more details.
192196  *
193197  * @v4l2_dev: pointer to struct v4l2_device
194198  */
195
-int __must_check
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-v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev);
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+static inline int __must_check
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+v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev)
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+{
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+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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+	return __v4l2_device_register_subdev_nodes(v4l2_dev, false);
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+#else
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+	return 0;
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+#endif
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+}
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+
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+/**
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+ * v4l2_device_register_ro_subdev_nodes - Registers subdevices device nodes
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+ *	in read-only mode
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+ *
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+ * Internally calls __v4l2_device_register_subdev_nodes(). See its documentation
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+ * for more details.
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+ *
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+ * @v4l2_dev: pointer to struct v4l2_device
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+ */
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+static inline int __must_check
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+v4l2_device_register_ro_subdev_nodes(struct v4l2_device *v4l2_dev)
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+{
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+#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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+	return __v4l2_device_register_subdev_nodes(v4l2_dev, true);
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+#else
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+	return 0;
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+#endif
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+}
197227 
198228 /**
199229  * v4l2_subdev_notify - Sends a notification to v4l2_device.
....@@ -209,6 +239,17 @@
209239 {
210240 	if (sd && sd->v4l2_dev && sd->v4l2_dev->notify)
211241 		sd->v4l2_dev->notify(sd, notification, arg);
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+}
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+
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+/**
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+ * v4l2_device_supports_requests - Test if requests are supported.
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+ *
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+ * @v4l2_dev: pointer to struct v4l2_device
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+ */
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+static inline bool v4l2_device_supports_requests(struct v4l2_device *v4l2_dev)
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+{
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+	return v4l2_dev->mdev && v4l2_dev->mdev->ops &&
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+	       v4l2_dev->mdev->ops->req_queue;
212253 }
213254 
214255 /* Helper macros to iterate over all subdevs. */
....@@ -241,7 +282,7 @@
241282  * @f: operation function that will be called if @cond matches.
242283  *	The operation functions are defined in groups, according to
243284  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
245286  *
246287  * Ignore any errors.
247288  *
....@@ -266,7 +307,7 @@
266307  * @f: operation function that will be called if @cond matches.
267308  *	The operation functions are defined in groups, according to
268309  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
270311  *
271312  * Ignore any errors.
272313  *
....@@ -294,7 +335,7 @@
294335  * @f: operation function that will be called if @cond matches.
295336  *	The operation functions are defined in groups, according to
296337  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
298339  *
299340  * Return:
300341  *
....@@ -329,7 +370,7 @@
329370  * @f: operation function that will be called if @cond matches.
330371  *	The operation functions are defined in groups, according to
331372  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
333374  *
334375  * Return:
335376  *
....@@ -360,7 +401,7 @@
360401  * @f: operation function that will be called if @cond matches.
361402  *	The operation functions are defined in groups, according to
362403  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
364405  *
365406  * Ignore any errors.
366407  *
....@@ -389,7 +430,7 @@
389430  * @f: operation function that will be called if @cond matches.
390431  *	The operation functions are defined in groups, according to
391432  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
393434  *
394435  * Return:
395436  *
....@@ -420,7 +461,7 @@
420461  * @f: operation function that will be called if @cond matches.
421462  *	The operation functions are defined in groups, according to
422463  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
424465  *
425466  * Ignore any errors.
426467  *
....@@ -448,7 +489,7 @@
448489  * @f: operation function that will be called if @cond matches.
449490  *	The operation functions are defined in groups, according to
450491  *	each element at &struct v4l2_subdev_ops.
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- * @args...: arguments for @f.
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+ * @args: arguments for @f.
452493  *
453494  * Return:
454495  *