include/uapi/linux/dvb/ca.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/dvb/ca.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/dvb/ca.h
Extension
.h
Size
3542 bytes
Lines
141
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ca_slot_info {
	int num;
	int type;
#define CA_CI            1
#define CA_CI_LINK       2
#define CA_CI_PHYS       4
#define CA_DESCR         8
#define CA_SC          128

	unsigned int flags;
#define CA_CI_MODULE_PRESENT 1
#define CA_CI_MODULE_READY   2
};


/**
 * struct ca_descr_info - descrambler types and info.
 *
 * @num:	number of available descramblers (keys).
 * @type:	type of supported scrambling system.
 *
 * Identifies the number of descramblers and their type.
 *
 * @type can be:
 *
 *	- %CA_ECD - European Common Descrambler (ECD) hardware;
 *	- %CA_NDS - Videoguard (NDS) hardware;
 *	- %CA_DSS - Distributed Sample Scrambling (DSS) hardware.
 */
struct ca_descr_info {
	unsigned int num;
	unsigned int type;
#define CA_ECD           1
#define CA_NDS           2
#define CA_DSS           4
};

/**
 * struct ca_caps - CA slot interface capabilities.
 *
 * @slot_num:	total number of CA card and module slots.
 * @slot_type:	bitmap with all supported types as defined at
 *		&struct ca_slot_info (e. g. %CA_CI, %CA_CI_LINK, etc).
 * @descr_num:	total number of descrambler slots (keys)
 * @descr_type:	bitmap with all supported types as defined at
 *		&struct ca_descr_info (e. g. %CA_ECD, %CA_NDS, etc).
 */
struct ca_caps {
	unsigned int slot_num;
	unsigned int slot_type;
	unsigned int descr_num;
	unsigned int descr_type;
};

/**
 * struct ca_msg - a message to/from a CI-CAM
 *
 * @index:	unused
 * @type:	unused
 * @length:	length of the message
 * @msg:	message
 *
 * This struct carries a message to be send/received from a CI CA module.
 */
struct ca_msg {
	unsigned int index;
	unsigned int type;
	unsigned int length;
	unsigned char msg[256];
};

/**
 * struct ca_descr - CA descrambler control words info
 *
 * @index: CA Descrambler slot
 * @parity: control words parity, where 0 means even and 1 means odd
 * @cw: CA Descrambler control words
 */
struct ca_descr {
	unsigned int index;
	unsigned int parity;
	unsigned char cw[8];
};

#define CA_RESET          _IO('o', 128)
#define CA_GET_CAP        _IOR('o', 129, struct ca_caps)
#define CA_GET_SLOT_INFO  _IOR('o', 130, struct ca_slot_info)
#define CA_GET_DESCR_INFO _IOR('o', 131, struct ca_descr_info)
#define CA_GET_MSG        _IOR('o', 132, struct ca_msg)
#define CA_SEND_MSG       _IOW('o', 133, struct ca_msg)

Annotation

Implementation Notes