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Diffstat (limited to 'Documentation/dvb/ci.txt')
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diff --git a/Documentation/dvb/ci.txt b/Documentation/dvb/ci.txt deleted file mode 100644 index 6c3bda50f..000000000 --- a/Documentation/dvb/ci.txt +++ /dev/null @@ -1,212 +0,0 @@ -* For the user -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -NOTE: This document describes the usage of the high level CI API as -in accordance to the Linux DVB API. This is a not a documentation for the, -existing low level CI API. -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -To utilize the High Level CI capabilities, - -(1*) This point is valid only for the Twinhan/clones - For the Twinhan/Twinhan clones, the dst_ca module handles the CI - hardware handling.This module is loaded automatically if a CI - (Common Interface, that holds the CAM (Conditional Access Module) - is detected. - -(2) one requires a userspace application, ca_zap. This small userland - application is in charge of sending the descrambling related information - to the CAM. - -This application requires the following to function properly as of now. - - (a) Tune to a valid channel, with szap. - eg: $ szap -c channels.conf -r "TMC" -x - - (b) a channels.conf containing a valid PMT PID - eg: TMC:11996:h:0:27500:278:512:650:321 - - here 278 is a valid PMT PID. the rest of the values are the - same ones that szap uses. - - (c) after running a szap, you have to run ca_zap, for the - descrambler to function, - eg: $ ca_zap channels.conf "TMC" - - (d) Hopefully enjoy your favourite subscribed channel as you do with - a FTA card. - -(3) Currently ca_zap, and dst_test, both are meant for demonstration - purposes only, they can become full fledged applications if necessary. - - -* Cards that fall in this category -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -At present the cards that fall in this category are the Twinhan and its -clones, these cards are available as VVMER, Tomato, Hercules, Orange and -so on. - -* CI modules that are supported -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -The CI module support is largely dependent upon the firmware on the cards -Some cards do support almost all of the available CI modules. There is -nothing much that can be done in order to make additional CI modules -working with these cards. - -Modules that have been tested by this driver at present are - -(1) Irdeto 1 and 2 from SCM -(2) Viaccess from SCM -(3) Dragoncam - -* The High level CI API -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - -* For the programmer -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -With the High Level CI approach any new card with almost any random -architecture can be implemented with this style, the definitions -inside the switch statement can be easily adapted for any card, thereby -eliminating the need for any additional ioctls. - -The disadvantage is that the driver/hardware has to manage the rest. For -the application programmer it would be as simple as sending/receiving an -array to/from the CI ioctls as defined in the Linux DVB API. No changes -have been made in the API to accommodate this feature. - - -* Why the need for another CI interface ? -~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -This is one of the most commonly asked question. Well a nice question. -Strictly speaking this is not a new interface. - -The CI interface is defined in the DVB API in ca.h as - -typedef struct ca_slot_info { - 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_DESCR 8 /* built-in descrambler */ -#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; - - - -This CI interface follows the CI high level interface, which is not -implemented by most applications. Hence this area is revisited. - -This CI interface is quite different in the case that it tries to -accommodate all other CI based devices, that fall into the other categories. - -This means that this CI interface handles the EN50221 style tags in the -Application layer only and no session management is taken care of by the -application. The driver/hardware will take care of all that. - -This interface is purely an EN50221 interface exchanging APDU's. This -means that no session management, link layer or a transport layer do -exist in this case in the application to driver communication. It is -as simple as that. The driver/hardware has to take care of that. - - -With this High Level CI interface, the interface can be defined with the -regular ioctls. - -All these ioctls are also valid for the High level CI interface - -#define CA_RESET _IO('o', 128) -#define CA_GET_CAP _IOR('o', 129, ca_caps_t) -#define CA_GET_SLOT_INFO _IOR('o', 130, ca_slot_info_t) -#define CA_GET_DESCR_INFO _IOR('o', 131, ca_descr_info_t) -#define CA_GET_MSG _IOR('o', 132, ca_msg_t) -#define CA_SEND_MSG _IOW('o', 133, ca_msg_t) -#define CA_SET_DESCR _IOW('o', 134, ca_descr_t) -#define CA_SET_PID _IOW('o', 135, ca_pid_t) - - -On querying the device, the device yields information thus - -CA_GET_SLOT_INFO ----------------------------- -Command = [info] -APP: Number=[1] -APP: Type=[1] -APP: flags=[1] -APP: CI High level interface -APP: CA/CI Module Present - -CA_GET_CAP ----------------------------- -Command = [caps] -APP: Slots=[1] -APP: Type=[1] -APP: Descrambler keys=[16] -APP: Type=[1] - -CA_SEND_MSG ----------------------------- -Descriptors(Program Level)=[ 09 06 06 04 05 50 ff f1] -Found CA descriptor @ program level - -(20) ES type=[2] ES pid=[201] ES length =[0 (0x0)] -(25) ES type=[4] ES pid=[301] ES length =[0 (0x0)] -ca_message length is 25 (0x19) bytes -EN50221 CA MSG=[ 9f 80 32 19 03 01 2d d1 f0 08 01 09 06 06 04 05 50 ff f1 02 e0 c9 00 00 04 e1 2d 00 00] - - -Not all ioctl's are implemented in the driver from the API, the other -features of the hardware that cannot be implemented by the API are achieved -using the CA_GET_MSG and CA_SEND_MSG ioctls. An EN50221 style wrapper is -used to exchange the data to maintain compatibility with other hardware. - - -/* a message to/from a CI-CAM */ -typedef struct ca_msg { - unsigned int index; - unsigned int type; - unsigned int length; - unsigned char msg[256]; -} ca_msg_t; - - -The flow of data can be described thus, - - - - - - App (User) - ----- - parse - | - | - v - en50221 APDU (package) - -------------------------------------- - | | | High Level CI driver - | | | - | v | - | en50221 APDU (unpackage) | - | | | - | | | - | v | - | sanity checks | - | | | - | | | - | v | - | do (H/W dep) | - -------------------------------------- - | Hardware - | - v - - - - -The High Level CI interface uses the EN50221 DVB standard, following a -standard ensures futureproofness. |