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Commit d651ff91 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
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media: v4l2-device.h: document helper macros 

There are several macros that aren't documented using kernel-docs
markups.

Document them.

While here, add cross-references to structs on this file.
Acked-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent c2a6a07a
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Showing with 211 additions and 35 deletions
include/media/v4l2-device.h
View file @ d651ff91
......@@ -38,7 +38,7 @@ struct v4l2_ctrl_handler;
* @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.
* @notify: notify operation 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.
......@@ -56,7 +56,6 @@ struct v4l2_ctrl_handler;
* #) @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)
......@@ -166,7 +165,7 @@ 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
* @sd: pointer to &struct v4l2_subdev
*
* While registered, the subdev module is marked as in-use.
*
......@@ -179,7 +178,7 @@ int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
/**
* v4l2_device_unregister_subdev - Unregisters a subdev with a v4l2 device.
*
* @sd: pointer to struct &v4l2_subdev
* @sd: pointer to &struct v4l2_subdev
*
* .. note ::
*
......@@ -201,7 +200,7 @@ 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
* @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
......@@ -214,13 +213,43 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
sd->v4l2_dev->notify(sd, notification, arg);
}
/* Iterate over all subdevs. */
/* Helper macros to iterate over all subdevs. */
/**
* v4l2_device_for_each_subdev - Helper macro that interates over all
* sub-devices of a given &v4l2_device.
*
* @sd: pointer that will be filled by the macro with all
* &struct v4l2_subdev pointer used as an iterator by the loop.
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
*
* This macro iterates over all sub-devices owned by the @v4l2_dev device.
* It acts as a for loop iterator and executes the next statement with
* the @sd variable pointing to each sub-device in turn.
*/
#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. */
/**
* __v4l2_device_call_subdevs_p - Calls the specified operation for
* all subdevs matching the condition.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @sd: pointer that will be filled by the macro with all
* &struct v4l2_subdev pointer used as an iterator by the loop.
* @cond: condition to be match
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Ignore any errors.
*
* Note: subdevs cannot be added or deleted 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) \
......@@ -228,6 +257,24 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
(sd)->ops->o->f((sd) , ##args); \
} while (0)
/**
* __v4l2_device_call_subdevs - Calls the specified operation for
* all subdevs matching the condition.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @cond: condition to be match
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Ignore any errors.
*
* Note: subdevs cannot be added or deleted while walking
* the subdevs list.
*/
#define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \
do { \
struct v4l2_subdev *__sd; \
......@@ -236,10 +283,30 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
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. */
/**
* __v4l2_device_call_subdevs_until_err_p - Calls the specified operation for
* all subdevs matching the condition.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @sd: pointer that will be filled by the macro with all
* &struct v4l2_subdev sub-devices associated with @v4l2_dev.
* @cond: condition to be match
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Return:
*
* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
* for any subdevice, then abort and return with that error code, zero
* otherwise.
*
* Note: subdevs cannot be added or deleted while walking
* the subdevs list.
*/
#define __v4l2_device_call_subdevs_until_err_p(v4l2_dev, sd, cond, o, f, args...) \
({ \
long __err = 0; \
......@@ -253,6 +320,28 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
(__err == -ENOIOCTLCMD) ? 0 : __err; \
})
/**
* __v4l2_device_call_subdevs_until_err - Calls the specified operation for
* all subdevs matching the condition.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @cond: condition to be match
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Return:
*
* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
* for any subdevice, then abort and return with that error code,
* zero otherwise.
*
* Note: subdevs cannot be added or deleted while walking
* the subdevs list.
*/
#define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
({ \
struct v4l2_subdev *__sd; \
......@@ -260,9 +349,26 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
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. */
/**
* v4l2_device_call_all - Calls the specified operation for
* all subdevs matching the &v4l2_subdev.grp_id, as assigned
* by the bridge driver.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @grpid: &struct v4l2_subdev->grp_id group ID to match.
* Use 0 to match them all.
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Ignore any errors.
*
* Note: subdevs cannot be added or deleted while walking
* the subdevs list.
*/
#define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \
do { \
struct v4l2_subdev *__sd; \
......@@ -272,10 +378,30 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
##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. */
/**
* v4l2_device_call_until_err - Calls the specified operation for
* all subdevs matching the &v4l2_subdev.grp_id, as assigned
* by the bridge driver, until an error occurs.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @grpid: &struct v4l2_subdev->grp_id group ID to match.
* Use 0 to match them all.
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Return:
*
* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
* for any subdevice, then abort and return with that error code,
* zero otherwise.
*
* Note: subdevs cannot be added or deleted while walking
* the subdevs list.
*/
#define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \
({ \
struct v4l2_subdev *__sd; \
......@@ -284,10 +410,24 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
##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.
/**
* v4l2_device_mask_call_all - Calls the specified operation for
* all subdevices where a group ID matches a specified bitmask.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
* group ID to be matched. Use 0 to match them all.
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Ignore any errors.
*
* Note: subdevs cannot be added or deleted while walking
* the subdevs list.
*/
#define v4l2_device_mask_call_all(v4l2_dev, grpmsk, o, f, args...) \
do { \
......@@ -298,11 +438,28 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
##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.
/**
* v4l2_device_mask_call_until_err - Calls the specified operation for
* all subdevices where a group ID matches a specified bitmask.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
* group ID to be matched. Use 0 to match them all.
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
* @args...: arguments for @f.
*
* Return:
*
* If the operation returns an error other than 0 or ``-ENOIOCTLCMD``
* for any subdevice, then abort and return with that error code,
* zero otherwise.
*
* Note: subdevs cannot be added or deleted while walking
* the subdevs list.
*/
#define v4l2_device_mask_call_until_err(v4l2_dev, grpmsk, o, f, args...) \
({ \
......@@ -312,9 +469,19 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
##args); \
})
/*
* Does any subdev with matching grpid (or all if grpid == 0) has the given
* op?
/**
* v4l2_device_has_op - checks if any subdev with matching grpid has a
* given ops.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @grpid: &struct v4l2_subdev->grp_id group ID to match.
* Use 0 to match them all.
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
*/
#define v4l2_device_has_op(v4l2_dev, grpid, o, f) \
({ \
......@@ -331,9 +498,18 @@ static inline void v4l2_subdev_notify(struct v4l2_subdev *sd,
__result; \
})
/*
* Does any subdev with matching grpmsk (or all if grpmsk == 0) has the given
* op?
/**
* v4l2_device_mask_has_op - checks if any subdev with matching group
* mask has a given ops.
*
* @v4l2_dev: &struct v4l2_device owning the sub-devices to iterate over.
* @grpmsk: bitmask to be checked against &struct v4l2_subdev->grp_id
* group ID to be matched. Use 0 to match them all.
* @o: name of the element at &struct v4l2_subdev_ops that contains @f.
* Each element there groups a set of operations functions.
* @f: operation function that will be called if @cond matches.
* The operation functions are defined in groups, according to
* each element at &struct v4l2_subdev_ops.
*/
#define v4l2_device_mask_has_op(v4l2_dev, grpmsk, o, f) \
({ \
......
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