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/*
* libdvbca - interface onto raw CA devices
*
* Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <linux/dvb/ca.h>
#include "dvbca.h"
int dvbca_open(int adapter, int cadevice)
{
char filename[PATH_MAX+1];
int fd;
sprintf(filename, "/dev/dvb/adapter%i/ca%i", adapter, cadevice);
if ((fd = open(filename, O_RDWR)) < 0) {
// if that failed, try a flat /dev structure
sprintf(filename, "/dev/dvb%i.ca%i", adapter, cadevice);
fd = open(filename, O_RDWR);
}
return fd;
}
int dvbca_reset(int fd, uint8_t slot)
{
return ioctl(fd, CA_RESET, (1 << slot));
}
int dvbca_get_interface_type(int fd, uint8_t slot)
{
ca_slot_info_t info;
info.num = slot;
if (ioctl(fd, CA_GET_SLOT_INFO, &info))
return -1;
if (info.type & CA_CI_LINK)
return DVBCA_INTERFACE_LINK;
if (info.type & CA_CI)
return DVBCA_INTERFACE_HLCI;
return -1;
}
int dvbca_get_cam_state(int fd, uint8_t slot)
{
ca_slot_info_t info;
info.num = slot;
if (ioctl(fd, CA_GET_SLOT_INFO, &info))
return -1;
if (info.flags == 0)
return DVBCA_CAMSTATE_MISSING;
if (info.flags & CA_CI_MODULE_READY)
return DVBCA_CAMSTATE_READY;
if (info.flags & CA_CI_MODULE_PRESENT)
return DVBCA_CAMSTATE_INITIALISING;
return -1;
}
int dvbca_link_write(int fd, uint8_t slot, uint8_t connection_id,
uint8_t *data, uint16_t data_length)
{
uint8_t *buf = malloc(data_length + 2);
if (buf == NULL)
return -1;
buf[0] = slot;
buf[1] = connection_id;
memcpy(buf+2, data, data_length);
int result = write(fd, buf, data_length+2);
free(buf);
return result;
}
int dvbca_link_read(int fd, uint8_t *slot, uint8_t *connection_id,
uint8_t *data, uint16_t data_length)
{
int size;
uint8_t *buf = malloc(data_length + 2);
if (buf == NULL)
return -1;
if ((size = read(fd, buf, data_length+2)) < 2)
return -1;
*slot = buf[0];
*connection_id = buf[1];
memcpy(data, buf+2, size-2);
free(buf);
return size - 2;
}
int dvbca_hlci_write(int fd, uint8_t *data, uint16_t data_length)
{
struct ca_msg msg;
if (data_length > 256) {
return -1;
}
memset(&msg, 0, sizeof(msg));
msg.length = data_length;
memcpy(msg.msg, data, data_length);
return ioctl(fd, CA_SEND_MSG, &msg);
}
int dvbca_hlci_read(int fd, uint32_t app_tag, uint8_t *data,
uint16_t data_length)
{
struct ca_msg msg;
if (data_length > 256) {
data_length = 256;
}
memset(&msg, 0, sizeof(msg));
msg.length = data_length;
msg.msg[0] = app_tag >> 16;
msg.msg[1] = app_tag >> 8;
msg.msg[2] = app_tag;
int status = ioctl(fd, CA_GET_MSG, &msg);
if (status < 0) return status;
if (msg.length > data_length) msg.length = data_length;
memcpy(data, msg.msg, msg.length);
return msg.length;
}
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