25985edced
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
212 lines
6.6 KiB
Text
212 lines
6.6 KiB
Text
* 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.
|