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media: dvbdev: fully document its functions

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There are several functions at the dvbdev that are common to all
digital TV device nodes with aren't documented.

Add documentation for them. No functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-09-19 16:11:55 -04:00
parent 6bbf7a855d
commit 400efa8e4e
1 changed files with 78 additions and 8 deletions
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86
drivers/media/dvb-core/dvbdev.h
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@ -261,7 +261,7 @@ void dvb_unregister_device(struct dvb_device *dvbdev);
* dvb_create_media_graph - Creates media graph for the Digital TV part of the
* device.
*
* @adap: pointer to struct dvb_adapter
* @adap: pointer to &struct dvb_adapter
* @create_rf_connector: if true, it creates the RF connector too
*
* This function checks all DVB-related functions at the media controller
@ -274,12 +274,23 @@ void dvb_unregister_device(struct dvb_device *dvbdev);
__must_check int dvb_create_media_graph(struct dvb_adapter *adap,
bool create_rf_connector);
/**
* dvb_register_media_controller - registers a media controller at DVB adapter
*
* @adap: pointer to &struct dvb_adapter
* @mdev: pointer to &struct media_device
*/
static inline void dvb_register_media_controller(struct dvb_adapter *adap,
struct media_device *mdev)
{
adap->mdev = mdev;
}
/**
* dvb_get_media_controller - gets the associated media controller
*
* @adap: pointer to &struct dvb_adapter
*/
static inline struct media_device
*dvb_get_media_controller(struct dvb_adapter *adap)
{
@ -296,20 +307,71 @@ int dvb_create_media_graph(struct dvb_adapter *adap,
#define dvb_get_media_controller(a) NULL
#endif
int dvb_generic_open (struct inode *inode, struct file *file);
int dvb_generic_release (struct inode *inode, struct file *file);
long dvb_generic_ioctl (struct file *file,
/**
* dvb_generic_open - Digital TV open function, used by DVB devices
*
* @inode: pointer to &struct inode.
* @file: pointer to &struct file.
*
* Checks if a DVB devnode is still valid, and if the permissions are
* OK and increment negative use count.
*/
int dvb_generic_open(struct inode *inode, struct file *file);
/**
* dvb_generic_close - Digital TV close function, used by DVB devices
*
* @inode: pointer to &struct inode.
* @file: pointer to &struct file.
*
* Checks if a DVB devnode is still valid, and if the permissions are
* OK and decrement negative use count.
*/
int dvb_generic_release(struct inode *inode, struct file *file);
/**
* dvb_generic_ioctl - Digital TV close function, used by DVB devices
*
* @file: pointer to &struct file.
* @cmd: Ioctl name.
* @arg: Ioctl argument.
*
* Checks if a DVB devnode and struct dvbdev.kernel_ioctl is still valid.
* If so, calls dvb_usercopy().
*/
long dvb_generic_ioctl(struct file *file,
unsigned int cmd, unsigned long arg);
/* we don't mess with video_usercopy() any more,
we simply define out own dvb_usercopy(), which will hopefully become
generic_usercopy() someday... */
/**
* dvb_usercopy - copies data from/to userspace memory when an ioctl is
* issued.
*
* @file: Pointer to struct &file.
* @cmd: Ioctl name.
* @arg: Ioctl argument.
* @func: function that will actually handle the ioctl
*
* Ancillary function that uses ioctl direction and size to copy from
* userspace. Then, it calls @func, and, if needed, data is copied back
* to userspace.
*/
int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
int (*func)(struct file *file, unsigned int cmd, void *arg));
/** generic DVB attach function. */
#ifdef CONFIG_MEDIA_ATTACH
/**
* dvb_attach - attaches a DVB frontend into the DVB core.
*
* @FUNCTION: function on a frontend module to be called.
* @ARGS...: @FUNCTION arguments.
*
* This ancillary function loads a frontend module in runtime and runs
* the @FUNCTION function there, with @ARGS.
* As it increments symbol usage cont, at unregister, dvb_detach()
* should be called.
*/
#define dvb_attach(FUNCTION, ARGS...) ({ \
void *__r = NULL; \
typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
@ -323,6 +385,14 @@ int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
__r; \
})
/**
* dvb_detach - detaches a DVB frontend loaded via dvb_attach()
*
* @FUNC: attach function
*
* Decrements usage count for a function previously called via dvb_attach().
*/
#define dvb_detach(FUNC) symbol_put_addr(FUNC)
#else