drivers/media/firewire/firedtv-ci.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * FireDTV driver (formerly known as FireSAT)
   4  *
   5  * Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
   6  * Copyright (C) 2008 Henrik Kurelid <henrik@kurelid.se>
   7  */
   8
   9 #include <linux/device.h>
  10 #include <linux/dvb/ca.h>
  11 #include <linux/fs.h>
  12 #include <linux/module.h>
  13
  14 #include <media/dvbdev.h>
  15
  16 #include "firedtv.h"
  17
  18 #define EN50221_TAG_APP_INFO_ENQUIRY    0x9f8020
  19 #define EN50221_TAG_CA_INFO_ENQUIRY     0x9f8030
  20 #define EN50221_TAG_CA_PMT              0x9f8032
  21 #define EN50221_TAG_ENTER_MENU          0x9f8022
  22
  23 static int fdtv_ca_ready(struct firedtv_tuner_status *stat)
  24 {
  25         return stat->ca_initialization_status   == 1 &&
  26                stat->ca_error_flag              == 0 &&
  27                stat->ca_dvb_flag                == 1 &&
  28                stat->ca_module_present_status   == 1;
  29 }
  30
  31 static int fdtv_get_ca_flags(struct firedtv_tuner_status *stat)
  32 {
  33         int flags = 0;
  34
  35         if (stat->ca_module_present_status == 1)
  36                 flags |= CA_CI_MODULE_PRESENT;
  37         if (stat->ca_initialization_status == 1 &&
  38             stat->ca_error_flag            == 0 &&
  39             stat->ca_dvb_flag              == 1)
  40                 flags |= CA_CI_MODULE_READY;
  41         return flags;
  42 }
  43
  44 static int fdtv_ca_get_caps(void *arg)
  45 {
  46         struct ca_caps *cap = arg;
  47
  48         cap->slot_num = 1;
  49         cap->slot_type = CA_CI;
  50         cap->descr_num = 1;
  51         cap->descr_type = CA_ECD;
  52         return 0;
  53 }
  54
  55 static int fdtv_ca_get_slot_info(struct firedtv *fdtv, void *arg)
  56 {
  57         struct firedtv_tuner_status stat;
  58         struct ca_slot_info *slot = arg;
  59         int err;
  60
  61         err = avc_tuner_status(fdtv, &stat);
  62         if (err)
  63                 return err;
  64
  65         if (slot->num != 0)
  66                 return -EACCES;
  67
  68         slot->type = CA_CI;
  69         slot->flags = fdtv_get_ca_flags(&stat);
  70         return 0;
  71 }
  72
  73 static int fdtv_ca_app_info(struct firedtv *fdtv, void *arg)
  74 {
  75         struct ca_msg *reply = arg;
  76
  77         return avc_ca_app_info(fdtv, reply->msg, &reply->length);
  78 }
  79
  80 static int fdtv_ca_info(struct firedtv *fdtv, void *arg)
  81 {
  82         struct ca_msg *reply = arg;
  83
  84         return avc_ca_info(fdtv, reply->msg, &reply->length);
  85 }
  86
  87 static int fdtv_ca_get_mmi(struct firedtv *fdtv, void *arg)
  88 {
  89         struct ca_msg *reply = arg;
  90
  91         return avc_ca_get_mmi(fdtv, reply->msg, &reply->length);
  92 }
  93
  94 static int fdtv_ca_get_msg(struct firedtv *fdtv, void *arg)
  95 {
  96         struct firedtv_tuner_status stat;
  97         int err;
  98
  99         switch (fdtv->ca_last_command) {
 100         case EN50221_TAG_APP_INFO_ENQUIRY:
 101                 err = fdtv_ca_app_info(fdtv, arg);
 102                 break;
 103         case EN50221_TAG_CA_INFO_ENQUIRY:
 104                 err = fdtv_ca_info(fdtv, arg);
 105                 break;
 106         default:
 107                 err = avc_tuner_status(fdtv, &stat);
 108                 if (err)
 109                         break;
 110                 if (stat.ca_mmi == 1)
 111                         err = fdtv_ca_get_mmi(fdtv, arg);
 112                 else {
 113                         dev_info(fdtv->device, "unhandled CA message 0x%08x\n",
 114                                  fdtv->ca_last_command);
 115                         err = -EACCES;
 116                 }
 117         }
 118         fdtv->ca_last_command = 0;
 119         return err;
 120 }
 121
 122 static int fdtv_ca_pmt(struct firedtv *fdtv, void *arg)
 123 {
 124         struct ca_msg *msg = arg;
 125         int data_pos;
 126         int data_length;
 127         int i;
 128
 129         data_pos = 4;
 130         if (msg->msg[3] & 0x80) {
 131                 data_length = 0;
 132                 for (i = 0; i < (msg->msg[3] & 0x7f); i++)
 133                         data_length = (data_length << 8) + msg->msg[data_pos++];
 134         } else {
 135                 data_length = msg->msg[3];
 136         }
 137         if (data_length > sizeof(msg->msg) - data_pos)
 138                 return -EINVAL;
 139
 140         return avc_ca_pmt(fdtv, &msg->msg[data_pos], data_length);
 141 }
 142
 143 static int fdtv_ca_send_msg(struct firedtv *fdtv, void *arg)
 144 {
 145         struct ca_msg *msg = arg;
 146         int err;
 147
 148         /* Do we need a semaphore for this? */
 149         fdtv->ca_last_command =
 150                 (msg->msg[0] << 16) + (msg->msg[1] << 8) + msg->msg[2];
 151         switch (fdtv->ca_last_command) {
 152         case EN50221_TAG_CA_PMT:
 153                 err = fdtv_ca_pmt(fdtv, arg);
 154                 break;
 155         case EN50221_TAG_APP_INFO_ENQUIRY:
 156                 /* handled in ca_get_msg */
 157                 err = 0;
 158                 break;
 159         case EN50221_TAG_CA_INFO_ENQUIRY:
 160                 /* handled in ca_get_msg */
 161                 err = 0;
 162                 break;
 163         case EN50221_TAG_ENTER_MENU:
 164                 err = avc_ca_enter_menu(fdtv);
 165                 break;
 166         default:
 167                 dev_err(fdtv->device, "unhandled CA message 0x%08x\n",
 168                         fdtv->ca_last_command);
 169                 err = -EACCES;
 170         }
 171         return err;
 172 }
 173
 174 static int fdtv_ca_ioctl(struct file *file, unsigned int cmd, void *arg)
 175 {
 176         struct dvb_device *dvbdev = file->private_data;
 177         struct firedtv *fdtv = dvbdev->priv;
 178         struct firedtv_tuner_status stat;
 179         int err;
 180
 181         switch (cmd) {
 182         case CA_RESET:
 183                 err = avc_ca_reset(fdtv);
 184                 break;
 185         case CA_GET_CAP:
 186                 err = fdtv_ca_get_caps(arg);
 187                 break;
 188         case CA_GET_SLOT_INFO:
 189                 err = fdtv_ca_get_slot_info(fdtv, arg);
 190                 break;
 191         case CA_GET_MSG:
 192                 err = fdtv_ca_get_msg(fdtv, arg);
 193                 break;
 194         case CA_SEND_MSG:
 195                 err = fdtv_ca_send_msg(fdtv, arg);
 196                 break;
 197         default:
 198                 dev_info(fdtv->device, "unhandled CA ioctl %u\n", cmd);
 199                 err = -EOPNOTSUPP;
 200         }
 201
 202         /* FIXME Is this necessary? */
 203         avc_tuner_status(fdtv, &stat);
 204
 205         return err;
 206 }
 207
 208 static __poll_t fdtv_ca_io_poll(struct file *file, poll_table *wait)
 209 {
 210         return EPOLLIN;
 211 }
 212
 213 static const struct file_operations fdtv_ca_fops = {
 214         .owner          = THIS_MODULE,
 215         .unlocked_ioctl = dvb_generic_ioctl,
 216         .open           = dvb_generic_open,
 217         .release        = dvb_generic_release,
 218         .poll           = fdtv_ca_io_poll,
 219         .llseek         = noop_llseek,
 220 };
 221
 222 static const struct dvb_device fdtv_ca = {
 223         .users          = 1,
 224         .readers        = 1,
 225         .writers        = 1,
 226         .fops           = &fdtv_ca_fops,
 227         .kernel_ioctl   = fdtv_ca_ioctl,
 228 };
 229
 230 int fdtv_ca_register(struct firedtv *fdtv)
 231 {
 232         struct firedtv_tuner_status stat;
 233         int err;
 234
 235         if (avc_tuner_status(fdtv, &stat))
 236                 return -EINVAL;
 237
 238         if (!fdtv_ca_ready(&stat))
 239                 return -EFAULT;
 240
 241         err = dvb_register_device(&fdtv->adapter, &fdtv->cadev,
 242                                   &fdtv_ca, fdtv, DVB_DEVICE_CA, 0);
 243
 244         if (stat.ca_application_info == 0)
 245                 dev_err(fdtv->device, "CaApplicationInfo is not set\n");
 246         if (stat.ca_date_time_request == 1)
 247                 avc_ca_get_time_date(fdtv, &fdtv->ca_time_interval);
 248
 249         return err;
 250 }
 251
 252 void fdtv_ca_release(struct firedtv *fdtv)
 253 {
 254         dvb_unregister_device(fdtv->cadev);
 255 }