text: /*
  	CA-driver for TwinHan DST Frontend/Card
  
  	Copyright (C) 2004, 2005 Manu Abraham (manu@kromtek.com)
  
  	This program is free software; you can redistribute it and/or modify
  	it under the terms of the GNU General Public License as published by
  	the Free Software Foundation; either version 2 of the License, or
  	(at your option) any later version.
  
  	This program 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 General Public License for more details.
  
  	You should have received a copy of the GNU General Public License
  	along with this program; if not, write to the Free Software
  	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/init.h>
  #include <linux/mutex.h>
  #include <linux/string.h>
  #include <linux/dvb/ca.h>
  #include "dvbdev.h"
  #include "dvb_frontend.h"
  #include "dst_ca.h"
  #include "dst_common.h"
  
  #define DST_CA_ERROR		0
  #define DST_CA_NOTICE		1
  #define DST_CA_INFO		2
  #define DST_CA_DEBUG		3
  
  #define dprintk(x, y, z, format, arg...) do {						\
  	if (z) {									\
  		if	((x > DST_CA_ERROR) && (x > y))					\
  			printk(KERN_ERR "%s: " format "\n", __func__ , ##arg);	\
  		else if	((x > DST_CA_NOTICE) && (x > y))				\
  			printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg);	\
  		else if ((x > DST_CA_INFO) && (x > y))					\
  			printk(KERN_INFO "%s: " format "\n", __func__ , ##arg);	\
  		else if ((x > DST_CA_DEBUG) && (x > y))					\
  			printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg);	\
  	} else {									\
  		if (x > y)								\
  			printk(format, ## arg);						\
  	}										\
  } while(0)
  
  
  static DEFINE_MUTEX(dst_ca_mutex);
  static unsigned int verbose = 5;
  module_param(verbose, int, 0644);
  MODULE_PARM_DESC(verbose, "verbose startup messages, default is 1 (yes)");
  
  /*	Need some more work	*/
  static int ca_set_slot_descr(void)
  {
  	/*	We could make this more graceful ?	*/
  	return -EOPNOTSUPP;
  }
  
  /*	Need some more work	*/
  static int ca_set_pid(void)
  {
  	/*	We could make this more graceful ?	*/
  	return -EOPNOTSUPP;
  }
  
  static void put_command_and_length(u8 *data, int command, int length)
  {
  	data[0] = (command >> 16) & 0xff;
  	data[1] = (command >> 8) & 0xff;
  	data[2] = command & 0xff;
  	data[3] = length;
  }
  
  static void put_checksum(u8 *check_string, int length)
  {
  	dprintk(verbose, DST_CA_DEBUG, 1, " Computing string checksum.");
  	dprintk(verbose, DST_CA_DEBUG, 1, "  -> string length : 0x%02x", length);
  	check_string[length] = dst_check_sum (check_string, length);
  	dprintk(verbose, DST_CA_DEBUG, 1, "  -> checksum      : 0x%02x", check_string[length]);
  }
  
  static int dst_ci_command(struct dst_state* state, u8 * data, u8 *ca_string, u8 len, int read)
  {
  	u8 reply;
  
  	mutex_lock(&state->dst_mutex);
  	dst_comm_init(state);
  	msleep(65);
  
  	if (write_dst(state, data, len)) {
  		dprintk(verbose, DST_CA_INFO, 1, " Write not successful, trying to recover");
  		dst_error_recovery(state);
  		goto error;
  	}
  	if ((dst_pio_disable(state)) < 0) {
  		dprintk(verbose, DST_CA_ERROR, 1, " DST PIO disable failed.");
  		goto error;
  	}
  	if (read_dst(state, &reply, GET_ACK) < 0) {
  		dprintk(verbose, DST_CA_INFO, 1, " Read not successful, trying to recover");
  		dst_error_recovery(state);
  		goto error;
  	}
  	if (read) {
  		if (! dst_wait_dst_ready(state, LONG_DELAY)) {
  			dprintk(verbose, DST_CA_NOTICE, 1, " 8820 not ready");
  			goto error;
  		}
  		if (read_dst(state, ca_string, 128) < 0) {	/*	Try to make this dynamic	*/
  			dprintk(verbose, DST_CA_INFO, 1, " Read not successful, trying to recover");
  			dst_error_recovery(state);
  			goto error;
  		}
  	}
  	mutex_unlock(&state->dst_mutex);
  	return 0;
  
  error:
  	mutex_unlock(&state->dst_mutex);
  	return -EIO;
  }
  
  
  static int dst_put_ci(struct dst_state *state, u8 *data, int len, u8 *ca_string, int read)
  {
  	u8 dst_ca_comm_err = 0;
  
  	while (dst_ca_comm_err < RETRIES) {
  		dprintk(verbose, DST_CA_NOTICE, 1, " Put Command");
  		if (dst_ci_command(state, data, ca_string, len, read)) {	// If error
  			dst_error_recovery(state);
  			dst_ca_comm_err++; // work required here.
  		} else {
  			break;
  		}
  	}
  
  	if(dst_ca_comm_err == RETRIES)
  		return -1;
  
  	return 0;
  }
  
  
  
  static int ca_get_app_info(struct dst_state *state)
  {
  	int length, str_length;
  	static u8 command[8] = {0x07, 0x40, 0x01, 0x00, 0x01, 0x00, 0x00, 0xff};
  
  	put_checksum(&command[0], command[0]);
  	if ((dst_put_ci(state, command, sizeof(command), state->messages, GET_REPLY)) < 0) {
  		dprintk(verbose, DST_CA_ERROR, 1, " -->dst_put_ci FAILED !");
  		return -1;
  	}
  	dprintk(verbose, DST_CA_INFO, 1, " -->dst_put_ci SUCCESS !");
  	dprintk(verbose, DST_CA_INFO, 1, " ================================ CI Module Application Info ======================================");
  	dprintk(verbose, DST_CA_INFO, 1, " Application Type=[%d], Application Vendor=[%d], Vendor Code=[%d]\n%s: Application info=[%s]",
  		state->messages[7], (state->messages[8] << 8) | state->messages[9],
  		(state->messages[10] << 8) | state->messages[11], __func__, (char *)(&state->messages[12]));
  	dprintk(verbose, DST_CA_INFO, 1, " ==================================================================================================");
  
  	// Transform dst message to correct application_info message
  	length = state->messages[5];
  	str_length = length - 6;
  	if (str_length < 0) {
  		str_length = 0;
  		dprintk(verbose, DST_CA_ERROR, 1, "Invalid string length returned in ca_get_app_info(). Recovering.");
  	}
  
  	// First, the command and length fields
  	put_command_and_length(&state->messages[0], CA_APP_INFO, length);
  
  	// Copy application_type, application_manufacturer and manufacturer_code
  	memcpy(&state->messages[4], &state->messages[7], 5);
  
  	// Set string length and copy string
  	state->messages[9] = str_length;
  	memcpy(&state->messages[10], &state->messages[12], str_length);
  
  	return 0;
  }
  
  static int ca_get_ca_info(struct dst_state *state)
  {
  	int srcPtr, dstPtr, i, num_ids;
  	static u8 slot_command[8] = {0x07, 0x40, 0x00, 0x00, 0x02, 0x00, 0x00, 0xff};
  	const int in_system_id_pos = 8, out_system_id_pos = 4, in_num_ids_pos = 7;
  
  	put_checksum(&slot_command[0], slot_command[0]);
  	if ((dst_put_ci(state, slot_command, sizeof (slot_command), state->messages, GET_REPLY)) < 0) {
  		dprintk(verbose, DST_CA_ERROR, 1, " -->dst_put_ci FAILED !");
  		return -1;
  	}
  	dprintk(verbose, DST_CA_INFO, 1, " -->dst_put_ci SUCCESS !");
  
  	// Print raw data
  	dprintk(verbose, DST_CA_INFO, 0, " DST data = [");
  	for (i = 0; i < state->messages[0] + 1; i++) {
  		dprintk(verbose, DST_CA_INFO, 0, " 0x%02x", state->messages[i]);
  	}
  	dprintk(verbose, DST_CA_INFO, 0, "]\n");
  
  	// Set the command and length of the output
  	num_ids = state->messages[in_num_ids_pos];
  	if (num_ids >= 100) {
  		num_ids = 100;
  		dprintk(verbose, DST_CA_ERROR, 1, "Invalid number of ids (>100). Recovering.");
  	}
  	put_command_and_length(&state->messages[0], CA_INFO, num_ids * 2);
  
  	dprintk(verbose, DST_CA_INFO, 0, " CA_INFO = [");
  	srcPtr = in_system_id_pos;
  	dstPtr = out_system_id_pos;
  	for(i = 0; i < num_ids; i++) {
  		dprintk(verbose, DST_CA_INFO, 0, " 0x%02x%02x", state->messages[srcPtr + 0], state->messages[srcPtr + 1]);
  		// Append to output
  		state->messages[dstPtr + 0] = state->messages[srcPtr + 0];
  		state->messages[dstPtr + 1] = state->messages[srcPtr + 1];
  		srcPtr += 2;
  		dstPtr += 2;
  	}
  	dprintk(verbose, DST_CA_INFO, 0, "]\n");
  
  	return 0;
  }
  
  static int ca_get_slot_caps(struct dst_state *state, struct ca_caps *p_ca_caps, void __user *arg)
  {
  	int i;
  	u8 slot_cap[256];
  	static u8 slot_command[8] = {0x07, 0x40, 0x02, 0x00, 0x02, 0x00, 0x00, 0xff};
  
  	put_checksum(&slot_command[0], slot_command[0]);
  	if ((dst_put_ci(state, slot_command, sizeof (slot_command), slot_cap, GET_REPLY)) < 0) {
  		dprintk(verbose, DST_CA_ERROR, 1, " -->dst_put_ci FAILED !");
  		return -1;
  	}
  	dprintk(verbose, DST_CA_NOTICE, 1, " -->dst_put_ci SUCCESS !");
  
  	/*	Will implement the rest soon		*/
  
  	dprintk(verbose, DST_CA_INFO, 1, " Slot cap = [%d]", slot_cap[7]);
  	dprintk(verbose, DST_CA_INFO, 0, "===================================\n");
  	for (i = 0; i < slot_cap[0] + 1; i++)
  		dprintk(verbose, DST_CA_INFO, 0, " %d", slot_cap[i]);
  	dprintk(verbose, DST_CA_INFO, 0, "\n");
  
  	p_ca_caps->slot_num = 1;
  	p_ca_caps->slot_type = 1;
  	p_ca_caps->descr_num = slot_cap[7];
  	p_ca_caps->descr_type = 1;
  
  	if (copy_to_user(arg, p_ca_caps, sizeof (struct ca_caps)))
  		return -EFAULT;
  
  	return 0;
  }
  
  /*	Need some more work	*/
  static int ca_get_slot_descr(struct dst_state *state, struct ca_msg *p_ca_message, void __user *arg)
  {
  	return -EOPNOTSUPP;
  }
  
  
  static int ca_get_slot_info(struct dst_state *state, struct ca_slot_info *p_ca_slot_info, void __user *arg)
  {
  	int i;
  	static u8 slot_command[8] = {0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff};
  
  	u8 *slot_info = state->messages;
  
  	put_checksum(&slot_command[0], 7);
  	if ((dst_put_ci(state, slot_command, sizeof (slot_command), slot_info, GET_REPLY)) < 0) {
  		dprintk(verbose, DST_CA_ERROR, 1, " -->dst_put_ci FAILED !");
  		return -1;
  	}
  	dprintk(verbose, DST_CA_INFO, 1, " -->dst_put_ci SUCCESS !");
  
  	/*	Will implement the rest soon		*/
  
  	dprintk(verbose, DST_CA_INFO, 1, " Slot info = [%d]", slot_info[3]);
  	dprintk(verbose, DST_CA_INFO, 0, "===================================\n");
  	for (i = 0; i < 8; i++)
  		dprintk(verbose, DST_CA_INFO, 0, " %d", slot_info[i]);
  	dprintk(verbose, DST_CA_INFO, 0, "\n");
  
  	if (slot_info[4] & 0x80) {
  		p_ca_slot_info->flags = CA_CI_MODULE_PRESENT;
  		p_ca_slot_info->num = 1;
  		p_ca_slot_info->type = CA_CI;
  	} else if (slot_info[4] & 0x40) {
  		p_ca_slot_info->flags = CA_CI_MODULE_READY;
  		p_ca_slot_info->num = 1;
  		p_ca_slot_info->type = CA_CI;
  	} else
  		p_ca_slot_info->flags = 0;
  
  	if (copy_to_user(arg, p_ca_slot_info, sizeof (struct ca_slot_info)))
  		return -EFAULT;
  
  	return 0;
  }
  
  
  static int ca_get_message(struct dst_state *state, struct ca_msg *p_ca_message, void __user *arg)
  {
  	u8 i = 0;
  	u32 command = 0;
  
  	if (copy_from_user(p_ca_message, arg, sizeof (struct ca_msg)))
  		return -EFAULT;
  
  	if (p_ca_message->msg) {
  		dprintk(verbose, DST_CA_NOTICE, 1, " Message = [%02x %02x %02x]", p_ca_message->msg[0], p_ca_message->msg[1], p_ca_message->msg[2]);
  
  		for (i = 0; i < 3; i++) {
  			command = command | p_ca_message->msg[i];
  			if (i < 2)
  				command = command << 8;
  		}
  		dprintk(verbose, DST_CA_NOTICE, 1, " Command=[0x%x]", command);
  
  		switch (command) {
  		case CA_APP_INFO:
  			memcpy(p_ca_message->msg, state->messages, 128);
  			if (copy_to_user(arg, p_ca_message, sizeof (struct ca_msg)) )
  				return -EFAULT;
  			break;
  		case CA_INFO:
  			memcpy(p_ca_message->msg, state->messages, 128);
  			if (copy_to_user(arg, p_ca_message, sizeof (struct ca_msg)) )
  				return -EFAULT;
  			break;
  		}
  	}
  
  	return 0;
  }
  
  static int handle_dst_tag(struct dst_state *state, struct ca_msg *p_ca_message, struct ca_msg *hw_buffer, u32 length)
  {
  	if (state->dst_hw_cap & DST_TYPE_HAS_SESSION) {
  		hw_buffer->msg[2] = p_ca_message->msg[1];	/*	MSB	*/
  		hw_buffer->msg[3] = p_ca_message->msg[2];	/*	LSB	*/
  	} else {
  		if (length > 247) {
  			dprintk(verbose, DST_CA_ERROR, 1, " Message too long ! *** Bailing Out *** !");
  			return -1;
  		}
  		hw_buffer->msg[0] = (length & 0xff) + 7;
  		hw_buffer->msg[1] = 0x40;
  		hw_buffer->msg[2] = 0x03;
  		hw_buffer->msg[3] = 0x00;
  		hw_buffer->msg[4] = 0x03;
  		hw_buffer->msg[5] = length & 0xff;
  		hw_buffer->msg[6] = 0x00;
  
  		/*
  		 *	Need to compute length for EN50221 section 8.3.2, for the time being
  		 *	assuming 8.3.2 is not applicable
  		 */
  		memcpy(&hw_buffer->msg[7], &p_ca_message->msg[4], length);
  	}
  
  	return 0;
  }
  
  static int write_to_8820(struct dst_state *state, struct ca_msg *hw_buffer, u8 length, u8 reply)
  {
  	if ((dst_put_ci(state, hw_buffer->msg, length, hw_buffer->msg, reply)) < 0) {
  		dprintk(verbose, DST_CA_ERROR, 1, " DST-CI Command failed.");
  		dprintk(verbose, DST_CA_NOTICE, 1, " Resetting DST.");
  		rdc_reset_state(state);
  		return -1;
  	}
  	dprintk(verbose, DST_CA_NOTICE, 1, " DST-CI Command success.");
  
  	return 0;
  }
  
  static u32 asn_1_decode(u8 *asn_1_array)
  {
  	u8 length_field = 0, word_count = 0, count = 0;
  	u32 length = 0;
  
  	length_field = asn_1_array[0];
  	dprintk(verbose, DST_CA_DEBUG, 1, " Length field=[%02x]", length_field);
  	if (length_field < 0x80) {
  		length = length_field & 0x7f;
  		dprintk(verbose, DST_CA_DEBUG, 1, " Length=[%02x]\n", length);
  	} else {
  		word_count = length_field & 0x7f;
  		for (count = 0; count < word_count; count++) {
  			length = length  << 8;
  			length += asn_1_array[count + 1];
  			dprintk(verbose, DST_CA_DEBUG, 1, " Length=[%04x]", length);
  		}
  	}
  	return length;
  }
  
  static int debug_string(u8 *msg, u32 length, u32 offset)
  {
  	u32 i;
  
  	dprintk(verbose, DST_CA_DEBUG, 0, " String=[ ");
  	for (i = offset; i < length; i++)
  		dprintk(verbose, DST_CA_DEBUG, 0, "%02x ", msg[i]);
  	dprintk(verbose, DST_CA_DEBUG, 0, "]\n");
  
  	return 0;
  }
  
  
  static int ca_set_pmt(struct dst_state *state, struct ca_msg *p_ca_message, struct ca_msg *hw_buffer, u8 reply, u8 query)
  {
  	u32 length = 0;
  	u8 tag_length = 8;
  
  	length = asn_1_decode(&p_ca_message->msg[3]);
  	dprintk(verbose, DST_CA_DEBUG, 1, " CA Message length=[%d]", length);
  	debug_string(&p_ca_message->msg[4], length, 0); /*	length is excluding tag & length	*/
  
  	memset(hw_buffer->msg, '\0', length);
  	handle_dst_tag(state, p_ca_message, hw_buffer, length);
  	put_checksum(hw_buffer->msg, hw_buffer->msg[0]);
  
  	debug_string(hw_buffer->msg, (length + tag_length), 0); /*	tags too	*/
  	write_to_8820(state, hw_buffer, (length + tag_length), reply);
  
  	return 0;
  }
  
  
  /*	Board supports CA PMT reply ?		*/
  static int dst_check_ca_pmt(struct dst_state *state, struct ca_msg *p_ca_message, struct ca_msg *hw_buffer)
  {
  	int ca_pmt_reply_test = 0;
  
  	/*	Do test board			*/
  	/*	Not there yet but soon		*/
  
  	/*	CA PMT Reply capable		*/
  	if (ca_pmt_reply_test) {
  		if ((ca_set_pmt(state, p_ca_message, hw_buffer, 1, GET_REPLY)) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " ca_set_pmt.. failed !");
  			return -1;
  		}
  
  	/*	Process CA PMT Reply		*/
  	/*	will implement soon		*/
  		dprintk(verbose, DST_CA_ERROR, 1, " Not there yet");
  	}
  	/*	CA PMT Reply not capable	*/
  	if (!ca_pmt_reply_test) {
  		if ((ca_set_pmt(state, p_ca_message, hw_buffer, 0, NO_REPLY)) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " ca_set_pmt.. failed !");
  			return -1;
  		}
  		dprintk(verbose, DST_CA_NOTICE, 1, " ca_set_pmt.. success !");
  	/*	put a dummy message		*/
  
  	}
  	return 0;
  }
  
  static int ca_send_message(struct dst_state *state, struct ca_msg *p_ca_message, void __user *arg)
  {
  	int i = 0;
  
  	u32 command = 0;
  	struct ca_msg *hw_buffer;
  	int result = 0;
  
  	if ((hw_buffer = kmalloc(sizeof (struct ca_msg), GFP_KERNEL)) == NULL) {
  		dprintk(verbose, DST_CA_ERROR, 1, " Memory allocation failure");
  		return -ENOMEM;
  	}
  	dprintk(verbose, DST_CA_DEBUG, 1, " ");
  
  	if (copy_from_user(p_ca_message, arg, sizeof (struct ca_msg))) {
  		result = -EFAULT;
  		goto free_mem_and_exit;
  	}
  
  
  	if (p_ca_message->msg) {
  		/*	EN50221 tag	*/
  		command = 0;
  
  		for (i = 0; i < 3; i++) {
  			command = command | p_ca_message->msg[i];
  			if (i < 2)
  				command = command << 8;
  		}
  		dprintk(verbose, DST_CA_DEBUG, 1, " Command=[0x%x]\n", command);
  
  		switch (command) {
  		case CA_PMT:
  			dprintk(verbose, DST_CA_DEBUG, 1, "Command = SEND_CA_PMT");
  			if ((ca_set_pmt(state, p_ca_message, hw_buffer, 0, 0)) < 0) {	// code simplification started
  				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_PMT Failed !");
  				result = -1;
  				goto free_mem_and_exit;
  			}
  			dprintk(verbose, DST_CA_INFO, 1, " -->CA_PMT Success !");
  			break;
  		case CA_PMT_REPLY:
  			dprintk(verbose, DST_CA_INFO, 1, "Command = CA_PMT_REPLY");
  			/*      Have to handle the 2 basic types of cards here  */
  			if ((dst_check_ca_pmt(state, p_ca_message, hw_buffer)) < 0) {
  				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_PMT_REPLY Failed !");
  				result = -1;
  				goto free_mem_and_exit;
  			}
  			dprintk(verbose, DST_CA_INFO, 1, " -->CA_PMT_REPLY Success !");
  			break;
  		case CA_APP_INFO_ENQUIRY:		// only for debugging
  			dprintk(verbose, DST_CA_INFO, 1, " Getting Cam Application information");
  
  			if ((ca_get_app_info(state)) < 0) {
  				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_APP_INFO_ENQUIRY Failed !");
  				result = -1;
  				goto free_mem_and_exit;
  			}
  			dprintk(verbose, DST_CA_INFO, 1, " -->CA_APP_INFO_ENQUIRY Success !");
  			break;
  		case CA_INFO_ENQUIRY:
  			dprintk(verbose, DST_CA_INFO, 1, " Getting CA Information");
  
  			if ((ca_get_ca_info(state)) < 0) {
  				dprintk(verbose, DST_CA_ERROR, 1, " -->CA_INFO_ENQUIRY Failed !");
  				result = -1;
  				goto free_mem_and_exit;
  			}
  			dprintk(verbose, DST_CA_INFO, 1, " -->CA_INFO_ENQUIRY Success !");
  			break;
  		}
  	}
  free_mem_and_exit:
  	kfree (hw_buffer);
  
  	return result;
  }
  
  static long dst_ca_ioctl(struct file *file, unsigned int cmd, unsigned long ioctl_arg)
  {
  	struct dvb_device *dvbdev;
  	struct dst_state *state;
  	struct ca_slot_info *p_ca_slot_info;
  	struct ca_caps *p_ca_caps;
  	struct ca_msg *p_ca_message;
  	void __user *arg = (void __user *)ioctl_arg;
  	int result = 0;
  
  	mutex_lock(&dst_ca_mutex);
  	dvbdev = file->private_data;
  	state = (struct dst_state *)dvbdev->priv;
  	p_ca_message = kmalloc(sizeof (struct ca_msg), GFP_KERNEL);
  	p_ca_slot_info = kmalloc(sizeof (struct ca_slot_info), GFP_KERNEL);
  	p_ca_caps = kmalloc(sizeof (struct ca_caps), GFP_KERNEL);
  	if (!p_ca_message || !p_ca_slot_info || !p_ca_caps) {
  		dprintk(verbose, DST_CA_ERROR, 1, " Memory allocation failure");
  		result = -ENOMEM;
  		goto free_mem_and_exit;
  	}
  
  	/*	We have now only the standard ioctl's, the driver is upposed to handle internals.	*/
  	switch (cmd) {
  	case CA_SEND_MSG:
  		dprintk(verbose, DST_CA_INFO, 1, " Sending message");
  		if ((ca_send_message(state, p_ca_message, arg)) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_SEND_MSG Failed !");
  			result = -1;
  			goto free_mem_and_exit;
  		}
  		break;
  	case CA_GET_MSG:
  		dprintk(verbose, DST_CA_INFO, 1, " Getting message");
  		if ((ca_get_message(state, p_ca_message, arg)) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_GET_MSG Failed !");
  			result = -1;
  			goto free_mem_and_exit;
  		}
  		dprintk(verbose, DST_CA_INFO, 1, " -->CA_GET_MSG Success !");
  		break;
  	case CA_RESET:
  		dprintk(verbose, DST_CA_ERROR, 1, " Resetting DST");
  		dst_error_bailout(state);
  		msleep(4000);
  		break;
  	case CA_GET_SLOT_INFO:
  		dprintk(verbose, DST_CA_INFO, 1, " Getting Slot info");
  		if ((ca_get_slot_info(state, p_ca_slot_info, arg)) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_GET_SLOT_INFO Failed !");
  			result = -1;
  			goto free_mem_and_exit;
  		}
  		dprintk(verbose, DST_CA_INFO, 1, " -->CA_GET_SLOT_INFO Success !");
  		break;
  	case CA_GET_CAP:
  		dprintk(verbose, DST_CA_INFO, 1, " Getting Slot capabilities");
  		if ((ca_get_slot_caps(state, p_ca_caps, arg)) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_GET_CAP Failed !");
  			result = -1;
  			goto free_mem_and_exit;
  		}
  		dprintk(verbose, DST_CA_INFO, 1, " -->CA_GET_CAP Success !");
  		break;
  	case CA_GET_DESCR_INFO:
  		dprintk(verbose, DST_CA_INFO, 1, " Getting descrambler description");
  		if ((ca_get_slot_descr(state, p_ca_message, arg)) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_GET_DESCR_INFO Failed !");
  			result = -1;
  			goto free_mem_and_exit;
  		}
  		dprintk(verbose, DST_CA_INFO, 1, " -->CA_GET_DESCR_INFO Success !");
  		break;
  	case CA_SET_DESCR:
  		dprintk(verbose, DST_CA_INFO, 1, " Setting descrambler");
  		if ((ca_set_slot_descr()) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_SET_DESCR Failed !");
  			result = -1;
  			goto free_mem_and_exit;
  		}
  		dprintk(verbose, DST_CA_INFO, 1, " -->CA_SET_DESCR Success !");
  		break;
  	case CA_SET_PID:
  		dprintk(verbose, DST_CA_INFO, 1, " Setting PID");
  		if ((ca_set_pid()) < 0) {
  			dprintk(verbose, DST_CA_ERROR, 1, " -->CA_SET_PID Failed !");
  			result = -1;
  			goto free_mem_and_exit;
  		}
  		dprintk(verbose, DST_CA_INFO, 1, " -->CA_SET_PID Success !");
  	default:
  		result = -EOPNOTSUPP;
  	};
   free_mem_and_exit:
  	kfree (p_ca_message);
  	kfree (p_ca_slot_info);
  	kfree (p_ca_caps);
  
  	mutex_unlock(&dst_ca_mutex);
  	return result;
  }
  
  static int dst_ca_open(struct inode *inode, struct file *file)
  {
  	dprintk(verbose, DST_CA_DEBUG, 1, " Device opened [%p] ", file);
  	try_module_get(THIS_MODULE);
  
  	return 0;
  }
  
  static int dst_ca_release(struct inode *inode, struct file *file)
  {
  	dprintk(verbose, DST_CA_DEBUG, 1, " Device closed.");
  	module_put(THIS_MODULE);
  
  	return 0;
  }
  
  static ssize_t dst_ca_read(struct file *file, char __user *buffer, size_t length, loff_t *offset)
  {
  	ssize_t bytes_read = 0;
  
  	dprintk(verbose, DST_CA_DEBUG, 1, " Device read.");
  
  	return bytes_read;
  }
  
  static ssize_t dst_ca_write(struct file *file, const char __user *buffer, size_t length, loff_t *offset)
  {
  	dprintk(verbose, DST_CA_DEBUG, 1, " Device write.");
  
  	return 0;
  }
  
  static const struct file_operations dst_ca_fops = {
  	.owner = THIS_MODULE,
  	.unlocked_ioctl = dst_ca_ioctl,
  	.open = dst_ca_open,
  	.release = dst_ca_release,
  	.read = dst_ca_read,
  	.write = dst_ca_write,
  	.llseek = noop_llseek,
  };
  
  static struct dvb_device dvbdev_ca = {
  	.priv = NULL,
  	.users = 1,
  	.readers = 1,
  	.writers = 1,
  	.fops = &dst_ca_fops
  };
  
  struct dvb_device *dst_ca_attach(struct dst_state *dst, struct dvb_adapter *dvb_adapter)
  {
  	struct dvb_device *dvbdev;
  
  	dprintk(verbose, DST_CA_ERROR, 1, "registering DST-CA device");
  	if (dvb_register_device(dvb_adapter, &dvbdev, &dvbdev_ca, dst, DVB_DEVICE_CA) == 0) {
  		dst->dst_ca = dvbdev;
  		return dst->dst_ca;
  	}
  
  	return NULL;
  }
  
  EXPORT_SYMBOL(dst_ca_attach);
  
  MODULE_DESCRIPTION("DST DVB-S/T/C Combo CA driver");
  MODULE_AUTHOR("Manu Abraham");
  MODULE_LICENSE("GPL");
  