1
<title>DVB CA Device</title>
2
<para>The DVB CA device controls the conditional access hardware. It can be accessed through
3
<emphasis role="tt">/dev/dvb/adapter0/ca0</emphasis>. Data types and and ioctl definitions can be accessed by
4
including <emphasis role="tt">linux/dvb/ca.h</emphasis> in your application.
7
<section id="ca_data_types">
8
<title>CA Data Types</title>
11
<section id="ca_slot_info_t">
12
<title>ca_slot_info_t</title>
14
/⋆ slot interface types and info ⋆/
16
typedef struct ca_slot_info_s {
17
int num; /⋆ slot number ⋆/
19
int type; /⋆ CA interface this slot supports ⋆/
20
#define CA_CI 1 /⋆ CI high level interface ⋆/
21
#define CA_CI_LINK 2 /⋆ CI link layer level interface ⋆/
22
#define CA_CI_PHYS 4 /⋆ CI physical layer level interface ⋆/
23
#define CA_SC 128 /⋆ simple smart card interface ⋆/
26
#define CA_CI_MODULE_PRESENT 1 /⋆ module (or card) inserted ⋆/
27
#define CA_CI_MODULE_READY 2
32
<section id="ca_descr_info_t">
33
<title>ca_descr_info_t</title>
35
typedef struct ca_descr_info_s {
36
unsigned int num; /⋆ number of available descramblers (keys) ⋆/
37
unsigned int type; /⋆ type of supported scrambling system ⋆/
45
<section id="ca_cap_t">
46
<title>ca_cap_t</title>
48
typedef struct ca_cap_s {
49
unsigned int slot_num; /⋆ total number of CA card and module slots ⋆/
50
unsigned int slot_type; /⋆ OR of all supported types ⋆/
51
unsigned int descr_num; /⋆ total number of descrambler slots (keys) ⋆/
52
unsigned int descr_type;/⋆ OR of all supported types ⋆/
57
<section id="ca_msg_t">
58
<title>ca_msg_t</title>
60
/⋆ a message to/from a CI-CAM ⋆/
61
typedef struct ca_msg_s {
65
unsigned char msg[256];
70
<section id="ca_descr_t">
71
<title>ca_descr_t</title>
73
typedef struct ca_descr_s {
80
<section id="ca_function_calls">
81
<title>CA Function Calls</title>
84
<section id="ca_fopen">
88
<informaltable><tgroup cols="1"><tbody><row><entry
90
<para>This system call opens a named ca device (e.g. /dev/ost/ca) for subsequent use.</para>
91
<para>When an open() call has succeeded, the device will be ready for use.
92
The significance of blocking or non-blocking mode is described in the
93
documentation for functions where there is a difference. It does not affect the
94
semantics of the open() call itself. A device opened in blocking mode can later
95
be put into non-blocking mode (and vice versa) using the F_SETFL command
96
of the fcntl system call. This is a standard system call, documented in the Linux
97
manual page for fcntl. Only one user can open the CA Device in O_RDWR
98
mode. All other attempts to open the device in this mode will fail, and an error
99
code will be returned.</para>
101
</row></tbody></tgroup></informaltable>
104
<informaltable><tgroup cols="1"><tbody><row><entry
106
<para>int open(const char ⋆deviceName, int flags);</para>
108
</row></tbody></tgroup></informaltable>
111
<informaltable><tgroup cols="2"><tbody><row><entry
117
<para>Name of specific video device.</para>
121
<para>int flags</para>
124
<para>A bit-wise OR of the following flags:</para>
130
<para>O_RDONLY read-only access</para>
136
<para>O_RDWR read/write access</para>
142
<para>O_NONBLOCK open in non-blocking mode</para>
148
<para>(blocking mode is the default)</para>
150
</row></tbody></tgroup></informaltable>
153
<informaltable><tgroup cols="2"><tbody><row><entry
158
<para>Device driver not loaded/available.</para>
162
<para>EINTERNAL</para>
165
<para>Internal error.</para>
172
<para>Device or resource busy.</para>
179
<para>Invalid argument.</para>
181
</row></tbody></tgroup></informaltable>
184
<section id="ca_fclose">
185
<title>close()</title>
188
<informaltable><tgroup cols="1"><tbody><row><entry
190
<para>This system call closes a previously opened audio device.</para>
192
</row></tbody></tgroup></informaltable>
195
<informaltable><tgroup cols="1"><tbody><row><entry
197
<para>int close(int fd);</para>
199
</row></tbody></tgroup></informaltable>
202
<informaltable><tgroup cols="2"><tbody><row><entry
207
<para>File descriptor returned by a previous call to open().</para>
209
</row></tbody></tgroup></informaltable>
212
<informaltable><tgroup cols="2"><tbody><row><entry
217
<para>fd is not a valid open file descriptor.</para>
219
</row></tbody></tgroup></informaltable>