struct dvb_device

struct dvb_device
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Name

struct dvb_device — represents a DVB device node

Synopsis

struct dvb_device {
  struct list_head list_head;
  const struct file_operations * fops;
  struct dvb_adapter * adapter;
  int type;
  int minor;
  u32 id;
  int readers;
  int writers;
  int users;
  wait_queue_head_t wait_queue;
  int (* kernel_ioctl) (struct file *file, unsigned int cmd, void *arg);
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
  const char * name;
  struct media_entity * entity;
  struct media_pad * pads;
#endif
  void * priv;
};

Members

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

Description

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.