include/media/v4l2-device.h - linux-imx - Git at Google

 /*
     V4L2 device support header.

     Copyright (C) 2008  Hans Verkuil <hverkuil@xs4all.nl>

     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; either version 2 of the License, or
     (at your option) any later version.

     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
  */

 #ifndef _V4L2_DEVICE_H
 #define _V4L2_DEVICE_H

 #include <media/media-device.h>
 #include <media/v4l2-subdev.h>
 #include <media/v4l2-dev.h>

 #define V4L2_DEVICE_NAME_SIZE (20 + 16)

 struct v4l2_ctrl_handler;

 /**
  * struct v4l2_device - main struct to for V4L2 device drivers
  *
  * @dev: pointer to struct device.
  * @mdev: pointer to struct media_device
  * @subdevs: used to keep track of the registered subdevs
  * @lock: lock this struct; can be used by the driver as well
  *	if this struct is embedded into a larger struct.
  * @name: unique device name, by default the driver name + bus ID
  * @notify: notify callback called by some sub-devices.
  * @ctrl_handler: The control handler. May be %NULL.
  * @prio: Device's priority state
  * @ref: Keep track of the references to this struct.
  * @release: Release function that is called when the ref count
  *	goes to 0.
  *
  * Each instance of a V4L2 device should create the v4l2_device struct,
  * either stand-alone or embedded in a larger struct.
  *
  * It allows easy access to sub-devices (see v4l2-subdev.h) and provides
  * basic V4L2 device-level support.
  *
  * .. note::
  *
  *    #) @dev->driver_data points to this struct.
  *    #) @dev might be %NULL if there is no parent device
  */

 struct v4l2_device {
 	struct device *dev;
 #if defined(CONFIG_MEDIA_CONTROLLER)
 	struct media_device *mdev;
 #endif
 	struct list_head subdevs;
 	spinlock_t lock;
 	char name[V4L2_DEVICE_NAME_SIZE];
 	void (*notify)(struct v4l2_subdev *sd,
 			unsigned int notification, void *arg);
 	struct v4l2_ctrl_handler *ctrl_handler;
 	struct v4l2_prio_state prio;
 	/* BKL replacement mutex. Temporary solution only. */
 	struct mutex ioctl_lock;
 	struct kref ref;
 	void (*release)(struct v4l2_device *v4l2_dev);
 };

 /**
  * v4l2_device_get - gets a V4L2 device reference
  *
  * @v4l2_dev: pointer to struct &v4l2_device
  *
  * This is an ancillary routine meant to increment the usage for the
  * struct &v4l2_device pointed by @v4l2_dev.
  */
 static inline void v4l2_device_get(struct v4l2_device *v4l2_dev)
 {
 	kref_get(&v4l2_dev->ref);
 }

 /**
  * v4l2_device_put - putss a V4L2 device reference
  *
  * @v4l2_dev: pointer to struct &v4l2_device
  *
  * This is an ancillary routine meant to decrement the usage for the
  * struct &v4l2_device pointed by @v4l2_dev.
  */
 int v4l2_device_put(struct v4l2_device *v4l2_dev);

 /**
  * v4l2_device_register - Initialize v4l2_dev and make @dev->driver_data
  *	point to @v4l2_dev.
  *
  * @dev: pointer to struct &device
  * @v4l2_dev: pointer to struct &v4l2_device
  *
  * .. note::
  *	@dev may be %NULL in rare cases (ISA devices).
  *	In such case the caller must fill in the @v4l2_dev->name field
  *	before calling this function.
  */
 int __must_check v4l2_device_register(struct device *dev,
 				      struct v4l2_device *v4l2_dev);

 /**
  * v4l2_device_set_name - Optional function to initialize the
  *	name field of struct &v4l2_device
  *
  * @v4l2_dev: pointer to struct &v4l2_device
  * @basename: base name for the device name
  * @instance: pointer to a static atomic_t var with the instance usage for
  *	the device driver.
  *
  * v4l2_device_set_name() initializes the name field of struct &v4l2_device
  * using the driver name and a driver-global atomic_t instance.
  *
  * This function will increment the instance counter and returns the
  * instance value used in the name.
  *
  * Example:
  *
  *   static atomic_t drv_instance = ATOMIC_INIT(0);
  *
  *   ...
  *
  *   instance = v4l2_device_set_name(&\ v4l2_dev, "foo", &\ drv_instance);
  *
  * The first time this is called the name field will be set to foo0 and
  * this function returns 0. If the name ends with a digit (e.g. cx18),
  * then the name will be set to cx18-0 since cx180 would look really odd.
  */
 int v4l2_device_set_name(struct v4l2_device *v4l2_dev, const char *basename,
 			 atomic_t *instance);

 /**
  * v4l2_device_disconnect - Change V4L2 device state to disconnected.
  *
  * @v4l2_dev: pointer to struct v4l2_device
  *
  * Should be called when the USB parent disconnects.
  * Since the parent disappears, this ensures that @v4l2_dev doesn't have
  * an invalid parent pointer.
  *
  * .. note:: This function sets @v4l2_dev->dev to NULL.
  */
 void v4l2_device_disconnect(struct v4l2_device *v4l2_dev);

 /**
  *  v4l2_device_unregister - Unregister all sub-devices and any other
  *	 resources related to @v4l2_dev.
  *
  * @v4l2_dev: pointer to struct v4l2_device
  */
 void v4l2_device_unregister(struct v4l2_device *v4l2_dev);

 /**
  * v4l2_device_register_subdev - Registers a subdev with a v4l2 device.
  *
  * @v4l2_dev: pointer to struct &v4l2_device
  * @sd: pointer to struct &v4l2_subdev
  *
  * While registered, the subdev module is marked as in-use.
  *
  * An error is returned if the module is no longer loaded on any attempts
  * to register it.
  */
 int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
 					     struct v4l2_subdev *sd);

 /**
  * v4l2_device_unregister_subdev - Unregisters a subdev with a v4l2 device.
  *
  * @sd: pointer to struct &v4l2_subdev
  *
  * .. note ::
  *
  *	Can also be called if the subdev wasn't registered. In such
  *	case, it will do nothing.
  */
 void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);

 /**
  * v4l2_device_register_subdev_nodes - Registers device nodes for all subdevs
  *	of the v4l2 device that are marked with
  *	the %V4L2_SUBDEV_FL_HAS_DEVNODE flag.
  *
  * @v4l2_dev: pointer to struct v4l2_device
  */
 int __must_check
 v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev);

 /**
  * v4l2_subdev_notify - Sends a notification to v4l2_device.
  *
  * @sd: pointer to struct &v4l2_subdev
  * @notification: type of notification. Please notice that the notification
  *	type is driver-specific.
  * @arg: arguments for the notification. Those are specific to each
  *	notification type.
  */
 static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
 				      unsigned int notification, void *arg)
 {
 	if (sd && sd->v4l2_dev && sd->v4l2_dev->notify)
 		sd->v4l2_dev->notify(sd, notification, arg);
 }

 /* Iterate over all subdevs. */
 #define v4l2_device_for_each_subdev(sd, v4l2_dev)			\
 	list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)

 /* Call the specified callback for all subdevs matching the condition.
    Ignore any errors. Note that you cannot add or delete a subdev
    while walking the subdevs list. */
 #define __v4l2_device_call_subdevs_p(v4l2_dev, sd, cond, o, f, args...)	\
 	do {								\
 		list_for_each_entry((sd), &(v4l2_dev)->subdevs, list)	\
 			if ((cond) && (sd)->ops->o && (sd)->ops->o->f)	\
 				(sd)->ops->o->f((sd) , ##args);		\
 	} while (0)

 #define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...)	\
 	do {								\
 		struct v4l2_subdev *__sd;				\
 									\
 		__v4l2_device_call_subdevs_p(v4l2_dev, __sd, cond, o,	\
 						f , ##args);		\
 	} while (0)

 /* Call the specified callback for all subdevs matching the condition.
    If the callback returns an error other than 0 or -ENOIOCTLCMD, then
    return with that error code. Note that you cannot add or delete a
    subdev while walking the subdevs list. */
 #define __v4l2_device_call_subdevs_until_err_p(v4l2_dev, sd, cond, o, f, args...) \
 ({									\
 	long __err = 0;							\
 									\
 	list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) {		\
 		if ((cond) && (sd)->ops->o && (sd)->ops->o->f)		\
 			__err = (sd)->ops->o->f((sd) , ##args);		\
 		if (__err && __err != -ENOIOCTLCMD)			\
 			break;						\
 	}								\
 	(__err == -ENOIOCTLCMD) ? 0 : __err;				\
 })

 #define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
 ({									\
 	struct v4l2_subdev *__sd;					\
 	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, cond, o,	\
 						f , ##args);		\
 })

 /* Call the specified callback for all subdevs matching grp_id (if 0, then
    match them all). Ignore any errors. Note that you cannot add or delete
    a subdev while walking the subdevs list. */
 #define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...)		\
 	do {								\
 		struct v4l2_subdev *__sd;				\
 									\
 		__v4l2_device_call_subdevs_p(v4l2_dev, __sd,		\
 			!(grpid) || __sd->grp_id == (grpid), o, f ,	\
 			##args);					\
 	} while (0)

 /* Call the specified callback for all subdevs matching grp_id (if 0, then
    match them all). If the callback returns an error other than 0 or
    -ENOIOCTLCMD, then return with that error code. Note that you cannot
    add or delete a subdev while walking the subdevs list. */
 #define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...)	\
 ({									\
 	struct v4l2_subdev *__sd;					\
 	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd,		\
 			!(grpid) || __sd->grp_id == (grpid), o, f ,	\
 			##args);					\
 })

 /*
  * Call the specified callback for all subdevs where grp_id & grpmsk != 0
  * (if grpmsk == `0, then match them all). Ignore any errors. Note that you
  * cannot add or delete a subdev while walking the subdevs list.
  */
 #define v4l2_device_mask_call_all(v4l2_dev, grpmsk, o, f, args...)	\
 	do {								\
 		struct v4l2_subdev *__sd;				\
 									\
 		__v4l2_device_call_subdevs_p(v4l2_dev, __sd,		\
 			!(grpmsk) || (__sd->grp_id & (grpmsk)), o, f ,	\
 			##args);					\
 	} while (0)

 /*
  * Call the specified callback for all subdevs where grp_id & grpmsk != 0
  * (if grpmsk == 0, then match them all). If the callback returns an error
  * other than 0 or %-ENOIOCTLCMD, then return with that error code. Note that
  * you cannot add or delete a subdev while walking the subdevs list.
  */
 #define v4l2_device_mask_call_until_err(v4l2_dev, grpmsk, o, f, args...) \
 ({									\
 	struct v4l2_subdev *__sd;					\
 	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd,		\
 			!(grpmsk) || (__sd->grp_id & (grpmsk)), o, f ,	\
 			##args);					\
 })

 /*
  * Does any subdev with matching grpid (or all if grpid == 0) has the given
  * op?
  */
 #define v4l2_device_has_op(v4l2_dev, grpid, o, f)			\
 ({									\
 	struct v4l2_subdev *__sd;					\
 	bool __result = false;						\
 	list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) {		\
 		if ((grpid) && __sd->grp_id != (grpid))			\
 			continue;					\
 		if (v4l2_subdev_has_op(__sd, o, f)) {			\
 			__result = true;				\
 			break;						\
 		}							\
 	}								\
 	__result;							\
 })

 /*
  * Does any subdev with matching grpmsk (or all if grpmsk == 0) has the given
  * op?
  */
 #define v4l2_device_mask_has_op(v4l2_dev, grpmsk, o, f)			\
 ({									\
 	struct v4l2_subdev *__sd;					\
 	bool __result = false;						\
 	list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) {		\
 		if ((grpmsk) && !(__sd->grp_id & (grpmsk)))		\
 			continue;					\
 		if (v4l2_subdev_has_op(__sd, o, f)) {			\
 			__result = true;				\
 			break;						\
 		}							\
 	}								\
 	__result;							\
 })

 #endif
	/*
	V4L2 device support header.

	Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>

	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; either version 2 of the License, or
	(at your option) any later version.

	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
	*/

	#ifndef _V4L2_DEVICE_H
	#define _V4L2_DEVICE_H

	#include <media/media-device.h>
	#include <media/v4l2-subdev.h>
	#include <media/v4l2-dev.h>

	#define V4L2_DEVICE_NAME_SIZE (20 + 16)

	struct v4l2_ctrl_handler;

	/**
	* struct v4l2_device - main struct to for V4L2 device drivers
	*
	* @dev: pointer to struct device.
	* @mdev: pointer to struct media_device
	* @subdevs: used to keep track of the registered subdevs
	* @lock: lock this struct; can be used by the driver as well
	* if this struct is embedded into a larger struct.
	* @name: unique device name, by default the driver name + bus ID
	* @notify: notify callback called by some sub-devices.
	* @ctrl_handler: The control handler. May be %NULL.
	* @prio: Device's priority state
	* @ref: Keep track of the references to this struct.
	* @release: Release function that is called when the ref count
	* goes to 0.
	*
	* Each instance of a V4L2 device should create the v4l2_device struct,
	* either stand-alone or embedded in a larger struct.
	*
	* It allows easy access to sub-devices (see v4l2-subdev.h) and provides
	* basic V4L2 device-level support.
	*
	* .. note::
	*
	* #) @dev->driver_data points to this struct.
	* #) @dev might be %NULL if there is no parent device
	*/

	struct v4l2_device {
	struct device *dev;
	#if defined(CONFIG_MEDIA_CONTROLLER)
	struct media_device *mdev;
	#endif
	struct list_head subdevs;
	spinlock_t lock;
	char name[V4L2_DEVICE_NAME_SIZE];
	void (notify)(struct v4l2_subdev sd,
	unsigned int notification, void *arg);
	struct v4l2_ctrl_handler *ctrl_handler;
	struct v4l2_prio_state prio;
	/* BKL replacement mutex. Temporary solution only. */
	struct mutex ioctl_lock;
	struct kref ref;
	void (release)(struct v4l2_device v4l2_dev);
	};

	/**
	* v4l2_device_get - gets a V4L2 device reference
	*
	* @v4l2_dev: pointer to struct &v4l2_device
	*
	* This is an ancillary routine meant to increment the usage for the
	* struct &v4l2_device pointed by @v4l2_dev.
	*/
	static inline void v4l2_device_get(struct v4l2_device *v4l2_dev)
	{
	kref_get(&v4l2_dev->ref);
	}

	/**
	* v4l2_device_put - putss a V4L2 device reference
	*
	* @v4l2_dev: pointer to struct &v4l2_device
	*
	* This is an ancillary routine meant to decrement the usage for the
	* struct &v4l2_device pointed by @v4l2_dev.
	*/
	int v4l2_device_put(struct v4l2_device *v4l2_dev);

	/**
	* v4l2_device_register - Initialize v4l2_dev and make @dev->driver_data
	* point to @v4l2_dev.
	*
	* @dev: pointer to struct &device
	* @v4l2_dev: pointer to struct &v4l2_device
	*
	* .. note::
	* @dev may be %NULL in rare cases (ISA devices).
	* In such case the caller must fill in the @v4l2_dev->name field
	* before calling this function.
	*/
	int __must_check v4l2_device_register(struct device *dev,
	struct v4l2_device *v4l2_dev);

	/**
	* v4l2_device_set_name - Optional function to initialize the
	* name field of struct &v4l2_device
	*
	* @v4l2_dev: pointer to struct &v4l2_device
	* @basename: base name for the device name
	* @instance: pointer to a static atomic_t var with the instance usage for
	* the device driver.
	*
	* v4l2_device_set_name() initializes the name field of struct &v4l2_device
	* using the driver name and a driver-global atomic_t instance.
	*
	* This function will increment the instance counter and returns the
	* instance value used in the name.
	*
	* Example:
	*
	* static atomic_t drv_instance = ATOMIC_INIT(0);
	*
	* ...
	*
	* instance = v4l2_device_set_name(&\ v4l2_dev, "foo", &\ drv_instance);
	*
	* The first time this is called the name field will be set to foo0 and
	* this function returns 0. If the name ends with a digit (e.g. cx18),
	* then the name will be set to cx18-0 since cx180 would look really odd.
	*/
	int v4l2_device_set_name(struct v4l2_device v4l2_dev, const char basename,
	atomic_t *instance);

	/**
	* v4l2_device_disconnect - Change V4L2 device state to disconnected.
	*
	* @v4l2_dev: pointer to struct v4l2_device
	*
	* Should be called when the USB parent disconnects.
	* Since the parent disappears, this ensures that @v4l2_dev doesn't have
	* an invalid parent pointer.
	*
	* .. note:: This function sets @v4l2_dev->dev to NULL.
	*/
	void v4l2_device_disconnect(struct v4l2_device *v4l2_dev);

	/**
	* v4l2_device_unregister - Unregister all sub-devices and any other
	* resources related to @v4l2_dev.
	*
	* @v4l2_dev: pointer to struct v4l2_device
	*/
	void v4l2_device_unregister(struct v4l2_device *v4l2_dev);

	/**
	* v4l2_device_register_subdev - Registers a subdev with a v4l2 device.
	*
	* @v4l2_dev: pointer to struct &v4l2_device
	* @sd: pointer to struct &v4l2_subdev
	*
	* While registered, the subdev module is marked as in-use.
	*
	* An error is returned if the module is no longer loaded on any attempts
	* to register it.
	*/
	int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
	struct v4l2_subdev *sd);

	/**
	* v4l2_device_unregister_subdev - Unregisters a subdev with a v4l2 device.
	*
	* @sd: pointer to struct &v4l2_subdev
	*
	* .. note ::
	*
	* Can also be called if the subdev wasn't registered. In such
	* case, it will do nothing.
	*/
	void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);

	/**
	* v4l2_device_register_subdev_nodes - Registers device nodes for all subdevs
	* of the v4l2 device that are marked with
	* the %V4L2_SUBDEV_FL_HAS_DEVNODE flag.
	*
	* @v4l2_dev: pointer to struct v4l2_device
	*/
	int __must_check
	v4l2_device_register_subdev_nodes(struct v4l2_device *v4l2_dev);

	/**
	* v4l2_subdev_notify - Sends a notification to v4l2_device.
	*
	* @sd: pointer to struct &v4l2_subdev
	* @notification: type of notification. Please notice that the notification
	* type is driver-specific.
	* @arg: arguments for the notification. Those are specific to each
	* notification type.
	*/
	static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
	unsigned int notification, void *arg)
	{
	if (sd && sd->v4l2_dev && sd->v4l2_dev->notify)
	sd->v4l2_dev->notify(sd, notification, arg);
	}

	/* Iterate over all subdevs. */
	#define v4l2_device_for_each_subdev(sd, v4l2_dev) \
	list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)

	/* Call the specified callback for all subdevs matching the condition.
	Ignore any errors. Note that you cannot add or delete a subdev
	while walking the subdevs list. */
	#define __v4l2_device_call_subdevs_p(v4l2_dev, sd, cond, o, f, args...) \
	do { \
	list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) \
	if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \
	(sd)->ops->o->f((sd) , ##args); \
	} while (0)

	#define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \
	do { \
	struct v4l2_subdev *__sd; \
	\
	__v4l2_device_call_subdevs_p(v4l2_dev, __sd, cond, o, \
	f , ##args); \
	} while (0)

	/* Call the specified callback for all subdevs matching the condition.
	If the callback returns an error other than 0 or -ENOIOCTLCMD, then
	return with that error code. Note that you cannot add or delete a
	subdev while walking the subdevs list. */
	#define __v4l2_device_call_subdevs_until_err_p(v4l2_dev, sd, cond, o, f, args...) \
	({ \
	long __err = 0; \
	\
	list_for_each_entry((sd), &(v4l2_dev)->subdevs, list) { \
	if ((cond) && (sd)->ops->o && (sd)->ops->o->f) \
	__err = (sd)->ops->o->f((sd) , ##args); \
	if (__err && __err != -ENOIOCTLCMD) \
	break; \
	} \
	(__err == -ENOIOCTLCMD) ? 0 : __err; \
	})

	#define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
	({ \
	struct v4l2_subdev *__sd; \
	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, cond, o, \
	f , ##args); \
	})

	/* Call the specified callback for all subdevs matching grp_id (if 0, then
	match them all). Ignore any errors. Note that you cannot add or delete
	a subdev while walking the subdevs list. */
	#define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \
	do { \
	struct v4l2_subdev *__sd; \
	\
	__v4l2_device_call_subdevs_p(v4l2_dev, __sd, \
	!(grpid) \|\| __sd->grp_id == (grpid), o, f , \
	##args); \
	} while (0)

	/* Call the specified callback for all subdevs matching grp_id (if 0, then
	match them all). If the callback returns an error other than 0 or
	-ENOIOCTLCMD, then return with that error code. Note that you cannot
	add or delete a subdev while walking the subdevs list. */
	#define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \
	({ \
	struct v4l2_subdev *__sd; \
	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \
	!(grpid) \|\| __sd->grp_id == (grpid), o, f , \
	##args); \
	})

	/*
	* Call the specified callback for all subdevs where grp_id & grpmsk != 0
	* (if grpmsk == `0, then match them all). Ignore any errors. Note that you
	* cannot add or delete a subdev while walking the subdevs list.
	*/
	#define v4l2_device_mask_call_all(v4l2_dev, grpmsk, o, f, args...) \
	do { \
	struct v4l2_subdev *__sd; \
	\
	__v4l2_device_call_subdevs_p(v4l2_dev, __sd, \
	!(grpmsk) \|\| (__sd->grp_id & (grpmsk)), o, f , \
	##args); \
	} while (0)

	/*
	* Call the specified callback for all subdevs where grp_id & grpmsk != 0
	* (if grpmsk == 0, then match them all). If the callback returns an error
	* other than 0 or %-ENOIOCTLCMD, then return with that error code. Note that
	* you cannot add or delete a subdev while walking the subdevs list.
	*/
	#define v4l2_device_mask_call_until_err(v4l2_dev, grpmsk, o, f, args...) \
	({ \
	struct v4l2_subdev *__sd; \
	__v4l2_device_call_subdevs_until_err_p(v4l2_dev, __sd, \
	!(grpmsk) \|\| (__sd->grp_id & (grpmsk)), o, f , \
	##args); \
	})

	/*
	* Does any subdev with matching grpid (or all if grpid == 0) has the given
	* op?
	*/
	#define v4l2_device_has_op(v4l2_dev, grpid, o, f) \
	({ \
	struct v4l2_subdev *__sd; \
	bool __result = false; \
	list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \
	if ((grpid) && __sd->grp_id != (grpid)) \
	continue; \
	if (v4l2_subdev_has_op(__sd, o, f)) { \
	__result = true; \
	break; \
	} \
	} \
	__result; \
	})

	/*
	* Does any subdev with matching grpmsk (or all if grpmsk == 0) has the given
	* op?
	*/
	#define v4l2_device_mask_has_op(v4l2_dev, grpmsk, o, f) \
	({ \
	struct v4l2_subdev *__sd; \
	bool __result = false; \
	list_for_each_entry(__sd, &(v4l2_dev)->subdevs, list) { \
	if ((grpmsk) && !(__sd->grp_id & (grpmsk))) \
	continue; \
	if (v4l2_subdev_has_op(__sd, o, f)) { \
	__result = true; \
	break; \
	} \
	} \
	__result; \
	})

	#endif