The DVB CA device controls the conditional access hardware. It can be accessed through /dev/dvb/adapter0/ca0. Data types and and ioctl definitions can be accessed by including linux/dvb/ca.h in your application.

/⋆ slot interface types and info ⋆/ typedef struct ca_slot_info_s { int num; /⋆ slot number ⋆/ int type; /⋆ CA interface this slot supports ⋆/ #define CA_CI 1 /⋆ CI high level interface ⋆/ #define CA_CI_LINK 2 /⋆ CI link layer level interface ⋆/ #define CA_CI_PHYS 4 /⋆ CI physical layer level interface ⋆/ #define CA_SC 128 /⋆ simple smart card interface ⋆/ unsigned int flags; #define CA_CI_MODULE_PRESENT 1 /⋆ module (or card) inserted ⋆/ #define CA_CI_MODULE_READY 2 } ca_slot_info_t;

typedef struct ca_descr_info_s { unsigned int num; /⋆ number of available descramblers (keys) ⋆/ unsigned int type; /⋆ type of supported scrambling system ⋆/ #define CA_ECD 1 #define CA_NDS 2 #define CA_DSS 4 } ca_descr_info_t;

typedef struct ca_cap_s { unsigned int slot_num; /⋆ total number of CA card and module slots ⋆/ unsigned int slot_type; /⋆ OR of all supported types ⋆/ unsigned int descr_num; /⋆ total number of descrambler slots (keys) ⋆/ unsigned int descr_type;/⋆ OR of all supported types ⋆/ } ca_cap_t;

/⋆ a message to/from a CI-CAM ⋆/ typedef struct ca_msg_s { unsigned int index; unsigned int type; unsigned int length; unsigned char msg[256]; } ca_msg_t;

typedef struct ca_descr_s { unsigned int index; unsigned int parity; unsigned char cw[8]; } ca_descr_t;

DESCRIPTION This system call opens a named ca device (e.g. /dev/ost/ca) for subsequent use. When an open() call has succeeded, the device will be ready for use. The significance of blocking or non-blocking mode is described in the documentation for functions where there is a difference. It does not affect the semantics of the open() call itself. A device opened in blocking mode can later be put into non-blocking mode (and vice versa) using the F_SETFL command of the fcntl system call. This is a standard system call, documented in the Linux manual page for fcntl. Only one user can open the CA Device in O_RDWR mode. All other attempts to open the device in this mode will fail, and an error code will be returned. SYNOPSIS int open(const char ⋆deviceName, int flags); PARAMETERS const char *deviceName Name of specific video device. int flags A bit-wise OR of the following flags: O_RDONLY read-only access O_RDWR read/write access O_NONBLOCK open in non-blocking mode (blocking mode is the default) ERRORS ENODEV Device driver not loaded/available. EINTERNAL Internal error. EBUSY Device or resource busy. EINVAL Invalid argument.

DESCRIPTION This system call closes a previously opened audio device. SYNOPSIS int close(int fd); PARAMETERS int fd File descriptor returned by a previous call to open(). ERRORS EBADF fd is not a valid open file descriptor.