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221 lines
6.0 KiB
221 lines
6.0 KiB
<title>DVB CA Device</title>
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<para>The DVB CA device controls the conditional access hardware. It can be accessed through
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<emphasis role="tt">/dev/dvb/adapter0/ca0</emphasis>. Data types and and ioctl definitions can be accessed by
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including <emphasis role="tt">linux/dvb/ca.h</emphasis> in your application.
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</para>
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<section id="ca_data_types">
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<title>CA Data Types</title>
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<section id="ca_slot_info_t">
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<title>ca_slot_info_t</title>
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<programlisting>
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/⋆ slot interface types and info ⋆/
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typedef struct ca_slot_info_s {
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int num; /⋆ slot number ⋆/
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int type; /⋆ CA interface this slot supports ⋆/
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#define CA_CI 1 /⋆ CI high level interface ⋆/
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#define CA_CI_LINK 2 /⋆ CI link layer level interface ⋆/
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#define CA_CI_PHYS 4 /⋆ CI physical layer level interface ⋆/
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#define CA_SC 128 /⋆ simple smart card interface ⋆/
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unsigned int flags;
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#define CA_CI_MODULE_PRESENT 1 /⋆ module (or card) inserted ⋆/
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#define CA_CI_MODULE_READY 2
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} ca_slot_info_t;
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</programlisting>
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</section>
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<section id="ca_descr_info_t">
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<title>ca_descr_info_t</title>
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<programlisting>
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typedef struct ca_descr_info_s {
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unsigned int num; /⋆ number of available descramblers (keys) ⋆/
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unsigned int type; /⋆ type of supported scrambling system ⋆/
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#define CA_ECD 1
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#define CA_NDS 2
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#define CA_DSS 4
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} ca_descr_info_t;
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</programlisting>
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</section>
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<section id="ca_cap_t">
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<title>ca_cap_t</title>
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<programlisting>
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typedef struct ca_cap_s {
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unsigned int slot_num; /⋆ total number of CA card and module slots ⋆/
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unsigned int slot_type; /⋆ OR of all supported types ⋆/
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unsigned int descr_num; /⋆ total number of descrambler slots (keys) ⋆/
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unsigned int descr_type;/⋆ OR of all supported types ⋆/
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} ca_cap_t;
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</programlisting>
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</section>
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<section id="ca_msg_t">
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<title>ca_msg_t</title>
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<programlisting>
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/⋆ a message to/from a CI-CAM ⋆/
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typedef struct ca_msg_s {
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unsigned int index;
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unsigned int type;
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unsigned int length;
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unsigned char msg[256];
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} ca_msg_t;
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</programlisting>
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</section>
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<section id="ca_descr_t">
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<title>ca_descr_t</title>
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<programlisting>
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typedef struct ca_descr_s {
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unsigned int index;
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unsigned int parity;
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unsigned char cw[8];
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} ca_descr_t;
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</programlisting>
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</section></section>
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<section id="ca_function_calls">
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<title>CA Function Calls</title>
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<section id="ca_fopen">
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<title>open()</title>
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<para>DESCRIPTION
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>This system call opens a named ca device (e.g. /dev/ost/ca) for subsequent use.</para>
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<para>When an open() call has succeeded, the device will be ready for use.
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The significance of blocking or non-blocking mode is described in the
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documentation for functions where there is a difference. It does not affect the
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semantics of the open() call itself. A device opened in blocking mode can later
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be put into non-blocking mode (and vice versa) using the F_SETFL command
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of the fcntl system call. This is a standard system call, documented in the Linux
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manual page for fcntl. Only one user can open the CA Device in O_RDWR
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mode. All other attempts to open the device in this mode will fail, and an error
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code will be returned.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>SYNOPSIS
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>int open(const char ⋆deviceName, int flags);</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>PARAMETERS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>const char
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*deviceName</para>
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</entry><entry
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align="char">
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<para>Name of specific video device.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>int flags</para>
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</entry><entry
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align="char">
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<para>A bit-wise OR of the following flags:</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>O_RDONLY read-only access</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>O_RDWR read/write access</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>O_NONBLOCK open in non-blocking mode</para>
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</entry>
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</row><row><entry
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align="char">
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</entry><entry
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align="char">
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<para>(blocking mode is the default)</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>ERRORS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>ENODEV</para>
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</entry><entry
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align="char">
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<para>Device driver not loaded/available.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>EINTERNAL</para>
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</entry><entry
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align="char">
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<para>Internal error.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>EBUSY</para>
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</entry><entry
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align="char">
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<para>Device or resource busy.</para>
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</entry>
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</row><row><entry
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align="char">
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<para>EINVAL</para>
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</entry><entry
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align="char">
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<para>Invalid argument.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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</section>
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<section id="ca_fclose">
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<title>close()</title>
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<para>DESCRIPTION
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>This system call closes a previously opened audio device.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>SYNOPSIS
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</para>
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<informaltable><tgroup cols="1"><tbody><row><entry
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align="char">
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<para>int close(int fd);</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>PARAMETERS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>int fd</para>
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</entry><entry
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align="char">
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<para>File descriptor returned by a previous call to open().</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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<para>ERRORS
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</para>
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<informaltable><tgroup cols="2"><tbody><row><entry
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align="char">
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<para>EBADF</para>
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</entry><entry
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align="char">
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<para>fd is not a valid open file descriptor.</para>
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</entry>
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</row></tbody></tgroup></informaltable>
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</section>
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</section>
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