drivers/media/firewire/firedtv-ci.c

   1 /*
   2  * FireDTV driver (formerly known as FireSAT)
   3  *
   4  * Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
   5  * Copyright (C) 2008 Henrik Kurelid <henrik@kurelid.se>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License as
   9  *      published by the Free Software Foundation; either version 2 of
  10  *      the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/device.h>
  14 #include <linux/dvb/ca.h>
  15 #include <linux/fs.h>
  16 #include <linux/module.h>
  17
  18 #include <media/dvbdev.h>
  19
  20 #include "firedtv.h"
  21
  22 #define EN50221_TAG_APP_INFO_ENQUIRY    0x9f8020
  23 #define EN50221_TAG_CA_INFO_ENQUIRY     0x9f8030
  24 #define EN50221_TAG_CA_PMT              0x9f8032
  25 #define EN50221_TAG_ENTER_MENU          0x9f8022
  26
  27 static int fdtv_ca_ready(struct firedtv_tuner_status *stat)
  28 {
  29         return stat->ca_initialization_status   == 1 &&
  30                stat->ca_error_flag              == 0 &&
  31                stat->ca_dvb_flag                == 1 &&
  32                stat->ca_module_present_status   == 1;
  33 }
  34
  35 static int fdtv_get_ca_flags(struct firedtv_tuner_status *stat)
  36 {
  37         int flags = 0;
  38
  39         if (stat->ca_module_present_status == 1)
  40                 flags |= CA_CI_MODULE_PRESENT;
  41         if (stat->ca_initialization_status == 1 &&
  42             stat->ca_error_flag            == 0 &&
  43             stat->ca_dvb_flag              == 1)
  44                 flags |= CA_CI_MODULE_READY;
  45         return flags;
  46 }
  47
  48 static int fdtv_ca_get_caps(void *arg)
  49 {
  50         struct ca_caps *cap = arg;
  51
  52         cap->slot_num = 1;
  53         cap->slot_type = CA_CI;
  54         cap->descr_num = 1;
  55         cap->descr_type = CA_ECD;
  56         return 0;
  57 }
  58
  59 static int fdtv_ca_get_slot_info(struct firedtv *fdtv, void *arg)
  60 {
  61         struct firedtv_tuner_status stat;
  62         struct ca_slot_info *slot = arg;
  63         int err;
  64
  65         err = avc_tuner_status(fdtv, &stat);
  66         if (err)
  67                 return err;
  68
  69         if (slot->num != 0)
  70                 return -EACCES;
  71
  72         slot->type = CA_CI;
  73         slot->flags = fdtv_get_ca_flags(&stat);
  74         return 0;
  75 }
  76
  77 static int fdtv_ca_app_info(struct firedtv *fdtv, void *arg)
  78 {
  79         struct ca_msg *reply = arg;
  80
  81         return avc_ca_app_info(fdtv, reply->msg, &reply->length);
  82 }
  83
  84 static int fdtv_ca_info(struct firedtv *fdtv, void *arg)
  85 {
  86         struct ca_msg *reply = arg;
  87
  88         return avc_ca_info(fdtv, reply->msg, &reply->length);
  89 }
  90
  91 static int fdtv_ca_get_mmi(struct firedtv *fdtv, void *arg)
  92 {
  93         struct ca_msg *reply = arg;
  94
  95         return avc_ca_get_mmi(fdtv, reply->msg, &reply->length);
  96 }
  97
  98 static int fdtv_ca_get_msg(struct firedtv *fdtv, void *arg)
  99 {
 100         struct firedtv_tuner_status stat;
 101         int err;
 102
 103         switch (fdtv->ca_last_command) {
 104         case EN50221_TAG_APP_INFO_ENQUIRY:
 105                 err = fdtv_ca_app_info(fdtv, arg);
 106                 break;
 107         case EN50221_TAG_CA_INFO_ENQUIRY:
 108                 err = fdtv_ca_info(fdtv, arg);
 109                 break;
 110         default:
 111                 err = avc_tuner_status(fdtv, &stat);
 112                 if (err)
 113                         break;
 114                 if (stat.ca_mmi == 1)
 115                         err = fdtv_ca_get_mmi(fdtv, arg);
 116                 else {
 117                         dev_info(fdtv->device, "unhandled CA message 0x%08x\n",
 118                                  fdtv->ca_last_command);
 119                         err = -EACCES;
 120                 }
 121         }
 122         fdtv->ca_last_command = 0;
 123         return err;
 124 }
 125
 126 static int fdtv_ca_pmt(struct firedtv *fdtv, void *arg)
 127 {
 128         struct ca_msg *msg = arg;
 129         int data_pos;
 130         int data_length;
 131         int i;
 132
 133         data_pos = 4;
 134         if (msg->msg[3] & 0x80) {
 135                 data_length = 0;
 136                 for (i = 0; i < (msg->msg[3] & 0x7f); i++)
 137                         data_length = (data_length << 8) + msg->msg[data_pos++];
 138         } else {
 139                 data_length = msg->msg[3];
 140         }
 141
 142         return avc_ca_pmt(fdtv, &msg->msg[data_pos], data_length);
 143 }
 144
 145 static int fdtv_ca_send_msg(struct firedtv *fdtv, void *arg)
 146 {
 147         struct ca_msg *msg = arg;
 148         int err;
 149
 150         /* Do we need a semaphore for this? */
 151         fdtv->ca_last_command =
 152                 (msg->msg[0] << 16) + (msg->msg[1] << 8) + msg->msg[2];
 153         switch (fdtv->ca_last_command) {
 154         case EN50221_TAG_CA_PMT:
 155                 err = fdtv_ca_pmt(fdtv, arg);
 156                 break;
 157         case EN50221_TAG_APP_INFO_ENQUIRY:
 158                 /* handled in ca_get_msg */
 159                 err = 0;
 160                 break;
 161         case EN50221_TAG_CA_INFO_ENQUIRY:
 162                 /* handled in ca_get_msg */
 163                 err = 0;
 164                 break;
 165         case EN50221_TAG_ENTER_MENU:
 166                 err = avc_ca_enter_menu(fdtv);
 167                 break;
 168         default:
 169                 dev_err(fdtv->device, "unhandled CA message 0x%08x\n",
 170                         fdtv->ca_last_command);
 171                 err = -EACCES;
 172         }
 173         return err;
 174 }
 175
 176 static int fdtv_ca_ioctl(struct file *file, unsigned int cmd, void *arg)
 177 {
 178         struct dvb_device *dvbdev = file->private_data;
 179         struct firedtv *fdtv = dvbdev->priv;
 180         struct firedtv_tuner_status stat;
 181         int err;
 182
 183         switch (cmd) {
 184         case CA_RESET:
 185                 err = avc_ca_reset(fdtv);
 186                 break;
 187         case CA_GET_CAP:
 188                 err = fdtv_ca_get_caps(arg);
 189                 break;
 190         case CA_GET_SLOT_INFO:
 191                 err = fdtv_ca_get_slot_info(fdtv, arg);
 192                 break;
 193         case CA_GET_MSG:
 194                 err = fdtv_ca_get_msg(fdtv, arg);
 195                 break;
 196         case CA_SEND_MSG:
 197                 err = fdtv_ca_send_msg(fdtv, arg);
 198                 break;
 199         default:
 200                 dev_info(fdtv->device, "unhandled CA ioctl %u\n", cmd);
 201                 err = -EOPNOTSUPP;
 202         }
 203
 204         /* FIXME Is this necessary? */
 205         avc_tuner_status(fdtv, &stat);
 206
 207         return err;
 208 }
 209
 210 static __poll_t fdtv_ca_io_poll(struct file *file, poll_table *wait)
 211 {
 212         return EPOLLIN;
 213 }
 214
 215 static const struct file_operations fdtv_ca_fops = {
 216         .owner          = THIS_MODULE,
 217         .unlocked_ioctl = dvb_generic_ioctl,
 218         .open           = dvb_generic_open,
 219         .release        = dvb_generic_release,
 220         .poll           = fdtv_ca_io_poll,
 221         .llseek         = noop_llseek,
 222 };
 223
 224 static struct dvb_device fdtv_ca = {
 225         .users          = 1,
 226         .readers        = 1,
 227         .writers        = 1,
 228         .fops           = &fdtv_ca_fops,
 229         .kernel_ioctl   = fdtv_ca_ioctl,
 230 };
 231
 232 int fdtv_ca_register(struct firedtv *fdtv)
 233 {
 234         struct firedtv_tuner_status stat;
 235         int err;
 236
 237         if (avc_tuner_status(fdtv, &stat))
 238                 return -EINVAL;
 239
 240         if (!fdtv_ca_ready(&stat))
 241                 return -EFAULT;
 242
 243         err = dvb_register_device(&fdtv->adapter, &fdtv->cadev,
 244                                   &fdtv_ca, fdtv, DVB_DEVICE_CA, 0);
 245
 246         if (stat.ca_application_info == 0)
 247                 dev_err(fdtv->device, "CaApplicationInfo is not set\n");
 248         if (stat.ca_date_time_request == 1)
 249                 avc_ca_get_time_date(fdtv, &fdtv->ca_time_interval);
 250
 251         return err;
 252 }
 253
 254 void fdtv_ca_release(struct firedtv *fdtv)
 255 {
 256         dvb_unregister_device(fdtv->cadev);
 257 }