Documentation/media/uapi/dvb/fe-get-info.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _FE_GET_INFO:
   4
   5 *****************
   6 ioctl FE_GET_INFO
   7 *****************
   8
   9 Name
  10 ====
  11
  12 FE_GET_INFO - Query DVB frontend capabilities and returns information about the - front-end. This call only requires read-only access to the device
  13
  14
  15 Synopsis
  16 ========
  17
  18 .. cpp:function:: int ioctl( int fd, int request, struct dvb_frontend_info *argp )
  19
  20
  21 Arguments
  22 =========
  23
  24 ``fd``
  25     File descriptor returned by :ref:`open() <frontend_f_open>`.
  26
  27 ``request``
  28     FE_GET_INFO
  29
  30 ``argp``
  31     pointer to struct struct
  32     :ref:`dvb_frontend_info <dvb-frontend-info>`
  33
  34
  35 Description
  36 ===========
  37
  38 All DVB frontend devices support the ``FE_GET_INFO`` ioctl. It is used
  39 to identify kernel devices compatible with this specification and to
  40 obtain information about driver and hardware capabilities. The ioctl
  41 takes a pointer to dvb_frontend_info which is filled by the driver.
  42 When the driver is not compatible with this specification the ioctl
  43 returns an error.
  44
  45 .. _dvb-frontend-info:
  46
  47 struct dvb_frontend_info
  48 ========================
  49
  50 .. flat-table:: struct dvb_frontend_info
  51     :header-rows:  0
  52     :stub-columns: 0
  53     :widths:       1 1 2
  54
  55
  56     -  .. row 1
  57
  58        -  char
  59
  60        -  name[128]
  61
  62        -  Name of the frontend
  63
  64     -  .. row 2
  65
  66        -  fe_type_t
  67
  68        -  type
  69
  70        -  **DEPRECATED**. DVBv3 type. Should not be used on modern programs,
  71           as a frontend may have more than one type. So, the DVBv5 API
  72           should be used instead to enumerate and select the frontend type.
  73
  74     -  .. row 3
  75
  76        -  uint32_t
  77
  78        -  frequency_min
  79
  80        -  Minimal frequency supported by the frontend
  81
  82     -  .. row 4
  83
  84        -  uint32_t
  85
  86        -  frequency_max
  87
  88        -  Maximal frequency supported by the frontend
  89
  90     -  .. row 5
  91
  92        -  uint32_t
  93
  94        -  frequency_stepsize
  95
  96        -  Frequency step - all frequencies are multiple of this value
  97
  98     -  .. row 6
  99
 100        -  uint32_t
 101
 102        -  frequency_tolerance
 103
 104        -  Tolerance of the frequency
 105
 106     -  .. row 7
 107
 108        -  uint32_t
 109
 110        -  symbol_rate_min
 111
 112        -  Minimal symbol rate (for Cable/Satellite systems), in bauds
 113
 114     -  .. row 8
 115
 116        -  uint32_t
 117
 118        -  symbol_rate_max
 119
 120        -  Maximal symbol rate (for Cable/Satellite systems), in bauds
 121
 122     -  .. row 9
 123
 124        -  uint32_t
 125
 126        -  symbol_rate_tolerance
 127
 128        -  Maximal symbol rate tolerance, in ppm
 129
 130     -  .. row 10
 131
 132        -  uint32_t
 133
 134        -  notifier_delay
 135
 136        -  **DEPRECATED**. Not used by any driver.
 137
 138     -  .. row 11
 139
 140        -  enum :ref:`fe_caps <fe-caps>`
 141
 142        -  caps
 143
 144        -  Capabilities supported by the frontend
 145
 146
 147 .. note:: The frequencies are specified in Hz for Terrestrial and Cable
 148    systems. They're specified in kHz for Satellite systems
 149
 150
 151 .. _fe-caps-t:
 152
 153 frontend capabilities
 154 =====================
 155
 156 Capabilities describe what a frontend can do. Some capabilities are
 157 supported only on some specific frontend types.
 158
 159
 160 .. _fe-caps:
 161
 162 .. flat-table:: enum fe_caps
 163     :header-rows:  1
 164     :stub-columns: 0
 165
 166
 167     -  .. row 1
 168
 169        -  ID
 170
 171        -  Description
 172
 173     -  .. row 2
 174
 175        -  .. _FE-IS-STUPID:
 176
 177           ``FE_IS_STUPID``
 178
 179        -  There's something wrong at the frontend, and it can't report its
 180           capabilities
 181
 182     -  .. row 3
 183
 184        -  .. _FE-CAN-INVERSION-AUTO:
 185
 186           ``FE_CAN_INVERSION_AUTO``
 187
 188        -  The frontend is capable of auto-detecting inversion
 189
 190     -  .. row 4
 191
 192        -  .. _FE-CAN-FEC-1-2:
 193
 194           ``FE_CAN_FEC_1_2``
 195
 196        -  The frontend supports FEC 1/2
 197
 198     -  .. row 5
 199
 200        -  .. _FE-CAN-FEC-2-3:
 201
 202           ``FE_CAN_FEC_2_3``
 203
 204        -  The frontend supports FEC 2/3
 205
 206     -  .. row 6
 207
 208        -  .. _FE-CAN-FEC-3-4:
 209
 210           ``FE_CAN_FEC_3_4``
 211
 212        -  The frontend supports FEC 3/4
 213
 214     -  .. row 7
 215
 216        -  .. _FE-CAN-FEC-4-5:
 217
 218           ``FE_CAN_FEC_4_5``
 219
 220        -  The frontend supports FEC 4/5
 221
 222     -  .. row 8
 223
 224        -  .. _FE-CAN-FEC-5-6:
 225
 226           ``FE_CAN_FEC_5_6``
 227
 228        -  The frontend supports FEC 5/6
 229
 230     -  .. row 9
 231
 232        -  .. _FE-CAN-FEC-6-7:
 233
 234           ``FE_CAN_FEC_6_7``
 235
 236        -  The frontend supports FEC 6/7
 237
 238     -  .. row 10
 239
 240        -  .. _FE-CAN-FEC-7-8:
 241
 242           ``FE_CAN_FEC_7_8``
 243
 244        -  The frontend supports FEC 7/8
 245
 246     -  .. row 11
 247
 248        -  .. _FE-CAN-FEC-8-9:
 249
 250           ``FE_CAN_FEC_8_9``
 251
 252        -  The frontend supports FEC 8/9
 253
 254     -  .. row 12
 255
 256        -  .. _FE-CAN-FEC-AUTO:
 257
 258           ``FE_CAN_FEC_AUTO``
 259
 260        -  The frontend can autodetect FEC.
 261
 262     -  .. row 13
 263
 264        -  .. _FE-CAN-QPSK:
 265
 266           ``FE_CAN_QPSK``
 267
 268        -  The frontend supports QPSK modulation
 269
 270     -  .. row 14
 271
 272        -  .. _FE-CAN-QAM-16:
 273
 274           ``FE_CAN_QAM_16``
 275
 276        -  The frontend supports 16-QAM modulation
 277
 278     -  .. row 15
 279
 280        -  .. _FE-CAN-QAM-32:
 281
 282           ``FE_CAN_QAM_32``
 283
 284        -  The frontend supports 32-QAM modulation
 285
 286     -  .. row 16
 287
 288        -  .. _FE-CAN-QAM-64:
 289
 290           ``FE_CAN_QAM_64``
 291
 292        -  The frontend supports 64-QAM modulation
 293
 294     -  .. row 17
 295
 296        -  .. _FE-CAN-QAM-128:
 297
 298           ``FE_CAN_QAM_128``
 299
 300        -  The frontend supports 128-QAM modulation
 301
 302     -  .. row 18
 303
 304        -  .. _FE-CAN-QAM-256:
 305
 306           ``FE_CAN_QAM_256``
 307
 308        -  The frontend supports 256-QAM modulation
 309
 310     -  .. row 19
 311
 312        -  .. _FE-CAN-QAM-AUTO:
 313
 314           ``FE_CAN_QAM_AUTO``
 315
 316        -  The frontend can autodetect modulation
 317
 318     -  .. row 20
 319
 320        -  .. _FE-CAN-TRANSMISSION-MODE-AUTO:
 321
 322           ``FE_CAN_TRANSMISSION_MODE_AUTO``
 323
 324        -  The frontend can autodetect the transmission mode
 325
 326     -  .. row 21
 327
 328        -  .. _FE-CAN-BANDWIDTH-AUTO:
 329
 330           ``FE_CAN_BANDWIDTH_AUTO``
 331
 332        -  The frontend can autodetect the bandwidth
 333
 334     -  .. row 22
 335
 336        -  .. _FE-CAN-GUARD-INTERVAL-AUTO:
 337
 338           ``FE_CAN_GUARD_INTERVAL_AUTO``
 339
 340        -  The frontend can autodetect the guard interval
 341
 342     -  .. row 23
 343
 344        -  .. _FE-CAN-HIERARCHY-AUTO:
 345
 346           ``FE_CAN_HIERARCHY_AUTO``
 347
 348        -  The frontend can autodetect hierarch
 349
 350     -  .. row 24
 351
 352        -  .. _FE-CAN-8VSB:
 353
 354           ``FE_CAN_8VSB``
 355
 356        -  The frontend supports 8-VSB modulation
 357
 358     -  .. row 25
 359
 360        -  .. _FE-CAN-16VSB:
 361
 362           ``FE_CAN_16VSB``
 363
 364        -  The frontend supports 16-VSB modulation
 365
 366     -  .. row 26
 367
 368        -  .. _FE-HAS-EXTENDED-CAPS:
 369
 370           ``FE_HAS_EXTENDED_CAPS``
 371
 372        -  Currently, unused
 373
 374     -  .. row 27
 375
 376        -  .. _FE-CAN-MULTISTREAM:
 377
 378           ``FE_CAN_MULTISTREAM``
 379
 380        -  The frontend supports multistream filtering
 381
 382     -  .. row 28
 383
 384        -  .. _FE-CAN-TURBO-FEC:
 385
 386           ``FE_CAN_TURBO_FEC``
 387
 388        -  The frontend supports turbo FEC modulation
 389
 390     -  .. row 29
 391
 392        -  .. _FE-CAN-2G-MODULATION:
 393
 394           ``FE_CAN_2G_MODULATION``
 395
 396        -  The frontend supports "2nd generation modulation" (DVB-S2/T2)>
 397
 398     -  .. row 30
 399
 400        -  .. _FE-NEEDS-BENDING:
 401
 402           ``FE_NEEDS_BENDING``
 403
 404        -  Not supported anymore, don't use it
 405
 406     -  .. row 31
 407
 408        -  .. _FE-CAN-RECOVER:
 409
 410           ``FE_CAN_RECOVER``
 411
 412        -  The frontend can recover from a cable unplug automatically
 413
 414     -  .. row 32
 415
 416        -  .. _FE-CAN-MUTE-TS:
 417
 418           ``FE_CAN_MUTE_TS``
 419
 420        -  The frontend can stop spurious TS data output
 421
 422
 423 Return Value
 424 ============
 425
 426 On success 0 is returned, on error -1 and the ``errno`` variable is set
 427 appropriately. The generic error codes are described at the
 428 :ref:`Generic Error Codes <gen-errors>` chapter.