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dst_ca.c

/*
      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/init.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", __FUNCTION__ , ##arg);  \
            else if     ((x > DST_CA_NOTICE) && (x > y))                      \
                  printk(KERN_NOTICE "%s: " format "\n", __FUNCTION__ , ##arg);     \
            else if ((x > DST_CA_INFO) && (x > y))                            \
                  printk(KERN_INFO "%s: " format "\n", __FUNCTION__ , ##arg); \
            else if ((x > DST_CA_DEBUG) && (x > y))                           \
                  printk(KERN_DEBUG "%s: " format "\n", __FUNCTION__ , ##arg);      \
      } else {                                                    \
            if (x > y)                                            \
                  printk(format, ## arg);                               \
      }                                                           \
} while(0)


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], __FUNCTION__, (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;
      unsigned int ca_message_header_len;

      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) {
            ca_message_header_len = p_ca_message->length;   /*    Restore it back when you are done   */
            /*    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 int dst_ca_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long ioctl_arg)
{
      struct dvb_device* dvbdev = (struct dvb_device*) file->private_data;
      struct dst_state* state = (struct dst_state*) dvbdev->priv;
      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;

      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);

      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 struct file_operations dst_ca_fops = {
      .owner = THIS_MODULE,
      .ioctl = dst_ca_ioctl,
      .open = dst_ca_open,
      .release = dst_ca_release,
      .read = dst_ca_read,
      .write = dst_ca_write
};

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");

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