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authorMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-08-22 19:39:38 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-08-22 19:39:38 -0300
commitd071c833a0d30e7aae0ea565d92ef83c79106d6f (patch)
treedf383e757c35850a8d4aa4a448cd8e6f2295f521 /drivers/media/dvb-core
parent35848bf0aa6ba677458adfbde49ef73d10c9f381 (diff)
[media] dvbdev: document most of the functions/data structs
Document the most relevant functions and data structs for developers that are working with the DVB subsystem. Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> Acked-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/media/dvb-core')
-rw-r--r--drivers/media/dvb-core/dvbdev.h116
1 files changed, 99 insertions, 17 deletions
diff --git a/drivers/media/dvb-core/dvbdev.h b/drivers/media/dvb-core/dvbdev.h
index 12629b8ecb0c..c61a4f03a66f 100644
--- a/drivers/media/dvb-core/dvbdev.h
+++ b/drivers/media/dvb-core/dvbdev.h
@@ -57,6 +57,25 @@
struct dvb_frontend;
+/**
+ * struct dvb_adapter - represents a Digital TV adapter using Linux DVB API
+ *
+ * @num: Number of the adapter
+ * @list_head: List with the DVB adapters
+ * @device_list: List with the DVB devices
+ * @name: Name of the adapter
+ * @proposed_mac: proposed MAC address for the adapter
+ * @priv: private data
+ * @device: pointer to struct device
+ * @module: pointer to struct module
+ * @mfe_shared: mfe shared: indicates mutually exclusive frontends
+ * Thie usage of this flag is currently deprecated
+ * @mfe_dvbdev: Frontend device in use, in the case of MFE
+ * @mfe_lock: Lock to prevent using the other frontends when MFE is
+ * used.
+ * @mdev: pointer to struct media_device, used when the media
+ * controller is used.
+ */
struct dvb_adapter {
int num;
struct list_head list_head;
@@ -78,7 +97,34 @@ struct dvb_adapter {
#endif
};
-
+/**
+ * struct dvb_device - represents a DVB device node
+ *
+ * @list_head: List head with all DVB devices
+ * @fops: pointer to struct file_operations
+ * @adapter: pointer to the adapter that holds this device node
+ * @type: type of the device: DVB_DEVICE_SEC, DVB_DEVICE_FRONTEND,
+ * DVB_DEVICE_DEMUX, DVB_DEVICE_DVR, DVB_DEVICE_CA, DVB_DEVICE_NET
+ * @minor: devnode minor number. Major number is always DVB_MAJOR.
+ * @id: device ID number, inside the adapter
+ * @readers: Initialized by the caller. Each call to open() in Read Only mode
+ * decreases this counter by one.
+ * @writers: Initialized by the caller. Each call to open() in Read/Write
+ * mode decreases this counter by one.
+ * @users: Initialized by the caller. Each call to open() in any mode
+ * decreases this counter by one.
+ * @wait_queue: wait queue, used to wait for certain events inside one of
+ * the DVB API callers
+ * @kernel_ioctl: callback function used to handle ioctl calls from userspace.
+ * @name: Name to be used for the device at the Media Controller
+ * @entity: pointer to struct media_entity associated with the device node
+ * @pads: pointer to struct media_pad associated with @entity;
+ * @priv: private data
+ *
+ * This structure is used by the DVB core (frontend, CA, net, demux) in
+ * order to create the device nodes. Usually, driver should not initialize
+ * this struct diretly.
+ */
struct dvb_device {
struct list_head list_head;
const struct file_operations *fops;
@@ -109,19 +155,55 @@ struct dvb_device {
void *priv;
};
+/**
+ * dvb_register_adapter - Registers a new DVB adapter
+ *
+ * @adap: pointer to struct dvb_adapter
+ * @name: Adapter's name
+ * @module: initialized with THIS_MODULE at the caller
+ * @device: pointer to struct device that corresponds to the device driver
+ * @adapter_nums: Array with a list of the numbers for @dvb_register_adapter;
+ * to select among them. Typically, initialized with:
+ * DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums)
+ */
+int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
+ struct module *module, struct device *device,
+ short *adapter_nums);
-extern int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
- struct module *module, struct device *device,
- short *adapter_nums);
-extern int dvb_unregister_adapter (struct dvb_adapter *adap);
-
-extern int dvb_register_device (struct dvb_adapter *adap,
- struct dvb_device **pdvbdev,
- const struct dvb_device *template,
- void *priv,
- int type);
+/**
+ * dvb_unregister_adapter - Unregisters a DVB adapter
+ *
+ * @adap: pointer to struct dvb_adapter
+ */
+int dvb_unregister_adapter(struct dvb_adapter *adap);
-extern void dvb_unregister_device (struct dvb_device *dvbdev);
+/**
+ * dvb_register_device - Registers a new DVB device
+ *
+ * @adap: pointer to struct dvb_adapter
+ * @pdvbdev: pointer to the place where the new struct dvb_device will be
+ * stored
+ * @template: Template used to create &pdvbdev;
+ * @device: pointer to struct device that corresponds to the device driver
+ * @adapter_nums: Array with a list of the numbers for @dvb_register_adapter;
+ * to select among them. Typically, initialized with:
+ * DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums)
+ * @priv: private data
+ * @type: type of the device: DVB_DEVICE_SEC, DVB_DEVICE_FRONTEND,
+ * DVB_DEVICE_DEMUX, DVB_DEVICE_DVR, DVB_DEVICE_CA, DVB_DEVICE_NET
+ */
+int dvb_register_device(struct dvb_adapter *adap,
+ struct dvb_device **pdvbdev,
+ const struct dvb_device *template,
+ void *priv,
+ int type);
+
+/**
+ * dvb_unregister_device - Unregisters a DVB device
+ *
+ * @dvbdev: pointer to struct dvb_device
+ */
+void dvb_unregister_device(struct dvb_device *dvbdev);
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
void dvb_create_media_graph(struct dvb_adapter *adap);
@@ -136,17 +218,17 @@ static inline void dvb_create_media_graph(struct dvb_adapter *adap) {}
#define dvb_register_media_controller(a, b) {}
#endif
-extern int dvb_generic_open (struct inode *inode, struct file *file);
-extern int dvb_generic_release (struct inode *inode, struct file *file);
-extern long dvb_generic_ioctl (struct file *file,
+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,
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... */
-extern int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
- int (*func)(struct file *file, unsigned int cmd, void *arg));
+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

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