drivers/media/dvb-frontends/nxt6000.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         NxtWave Communications - NXT6000 demodulator driver
   4
   5     Copyright (C) 2002-2003 Florian Schirmer <jolt@tuxbox.org>
   6     Copyright (C) 2003 Paul Andreassen <paul@andreassen.com.au>
   7
   8 */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16 #include <linux/slab.h>
  17
  18 #include <media/dvb_frontend.h>
  19 #include "nxt6000_priv.h"
  20 #include "nxt6000.h"
  21
  22
  23
  24 struct nxt6000_state {
  25         struct i2c_adapter* i2c;
  26         /* configuration settings */
  27         const struct nxt6000_config* config;
  28         struct dvb_frontend frontend;
  29 };
  30
  31 static int debug;
  32 #define dprintk(fmt, arg...) do {                                       \
  33         if (debug)                                                      \
  34                 printk(KERN_DEBUG pr_fmt("%s: " fmt),                   \
  35                        __func__, ##arg);                                \
  36 } while (0)
  37
  38 static int nxt6000_writereg(struct nxt6000_state* state, u8 reg, u8 data)
  39 {
  40         u8 buf[] = { reg, data };
  41         struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 };
  42         int ret;
  43
  44         if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1)
  45                 dprintk("nxt6000: nxt6000_write error (reg: 0x%02X, data: 0x%02X, ret: %d)\n", reg, data, ret);
  46
  47         return (ret != 1) ? -EIO : 0;
  48 }
  49
  50 static u8 nxt6000_readreg(struct nxt6000_state* state, u8 reg)
  51 {
  52         int ret;
  53         u8 b0[] = { reg };
  54         u8 b1[] = { 0 };
  55         struct i2c_msg msgs[] = {
  56                 {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1},
  57                 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
  58         };
  59
  60         ret = i2c_transfer(state->i2c, msgs, 2);
  61
  62         if (ret != 2)
  63                 dprintk("nxt6000: nxt6000_read error (reg: 0x%02X, ret: %d)\n", reg, ret);
  64
  65         return b1[0];
  66 }
  67
  68 static void nxt6000_reset(struct nxt6000_state* state)
  69 {
  70         u8 val;
  71
  72         val = nxt6000_readreg(state, OFDM_COR_CTL);
  73
  74         nxt6000_writereg(state, OFDM_COR_CTL, val & ~COREACT);
  75         nxt6000_writereg(state, OFDM_COR_CTL, val | COREACT);
  76 }
  77
  78 static int nxt6000_set_bandwidth(struct nxt6000_state *state, u32 bandwidth)
  79 {
  80         u16 nominal_rate;
  81         int result;
  82
  83         switch (bandwidth) {
  84         case 6000000:
  85                 nominal_rate = 0x55B7;
  86                 break;
  87
  88         case 7000000:
  89                 nominal_rate = 0x6400;
  90                 break;
  91
  92         case 8000000:
  93                 nominal_rate = 0x7249;
  94                 break;
  95
  96         default:
  97                 return -EINVAL;
  98         }
  99
 100         if ((result = nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, nominal_rate & 0xFF)) < 0)
 101                 return result;
 102
 103         return nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, (nominal_rate >> 8) & 0xFF);
 104 }
 105
 106 static int nxt6000_set_guard_interval(struct nxt6000_state *state,
 107                                       enum fe_guard_interval guard_interval)
 108 {
 109         switch (guard_interval) {
 110
 111         case GUARD_INTERVAL_1_32:
 112                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x00 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 113
 114         case GUARD_INTERVAL_1_16:
 115                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x01 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 116
 117         case GUARD_INTERVAL_AUTO:
 118         case GUARD_INTERVAL_1_8:
 119                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x02 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 120
 121         case GUARD_INTERVAL_1_4:
 122                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x03 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 123
 124         default:
 125                 return -EINVAL;
 126         }
 127 }
 128
 129 static int nxt6000_set_inversion(struct nxt6000_state *state,
 130                                  enum fe_spectral_inversion inversion)
 131 {
 132         switch (inversion) {
 133
 134         case INVERSION_OFF:
 135                 return nxt6000_writereg(state, OFDM_ITB_CTL, 0x00);
 136
 137         case INVERSION_ON:
 138                 return nxt6000_writereg(state, OFDM_ITB_CTL, ITBINV);
 139
 140         default:
 141                 return -EINVAL;
 142
 143         }
 144 }
 145
 146 static int
 147 nxt6000_set_transmission_mode(struct nxt6000_state *state,
 148                               enum fe_transmit_mode transmission_mode)
 149 {
 150         int result;
 151
 152         switch (transmission_mode) {
 153
 154         case TRANSMISSION_MODE_2K:
 155                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x00 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 156                         return result;
 157
 158                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x00 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 159
 160         case TRANSMISSION_MODE_8K:
 161         case TRANSMISSION_MODE_AUTO:
 162                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x02 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 163                         return result;
 164
 165                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x01 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 166
 167         default:
 168                 return -EINVAL;
 169
 170         }
 171 }
 172
 173 static void nxt6000_setup(struct dvb_frontend* fe)
 174 {
 175         struct nxt6000_state* state = fe->demodulator_priv;
 176
 177         nxt6000_writereg(state, RS_COR_SYNC_PARAM, SYNC_PARAM);
 178         nxt6000_writereg(state, BER_CTRL, /*(1 << 2) | */ (0x01 << 1) | 0x01);
 179         nxt6000_writereg(state, VIT_BERTIME_2, 0x00);  // BER Timer = 0x000200 * 256 = 131072 bits
 180         nxt6000_writereg(state, VIT_BERTIME_1, 0x02);  //
 181         nxt6000_writereg(state, VIT_BERTIME_0, 0x00);  //
 182         nxt6000_writereg(state, VIT_COR_INTEN, 0x98); // Enable BER interrupts
 183         nxt6000_writereg(state, VIT_COR_CTL, 0x82);   // Enable BER measurement
 184         nxt6000_writereg(state, VIT_COR_CTL, VIT_COR_RESYNC | 0x02 );
 185         nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F));
 186         nxt6000_writereg(state, OFDM_COR_MODEGUARD, FORCEMODE8K | 0x02);
 187         nxt6000_writereg(state, OFDM_AGC_CTL, AGCLAST | INITIAL_AGC_BW);
 188         nxt6000_writereg(state, OFDM_ITB_FREQ_1, 0x06);
 189         nxt6000_writereg(state, OFDM_ITB_FREQ_2, 0x31);
 190         nxt6000_writereg(state, OFDM_CAS_CTL, (0x01 << 7) | (0x02 << 3) | 0x04);
 191         nxt6000_writereg(state, CAS_FREQ, 0xBB);        /* CHECKME */
 192         nxt6000_writereg(state, OFDM_SYR_CTL, 1 << 2);
 193         nxt6000_writereg(state, OFDM_PPM_CTL_1, PPM256);
 194         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, 0x49);
 195         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, 0x72);
 196         nxt6000_writereg(state, ANALOG_CONTROL_0, 1 << 5);
 197         nxt6000_writereg(state, EN_DMD_RACQ, (1 << 7) | (3 << 4) | 2);
 198         nxt6000_writereg(state, DIAG_CONFIG, TB_SET);
 199
 200         if (state->config->clock_inversion)
 201                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, CLKINVERSION);
 202         else
 203                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, 0);
 204
 205         nxt6000_writereg(state, TS_FORMAT, 0);
 206 }
 207
 208 static void nxt6000_dump_status(struct nxt6000_state *state)
 209 {
 210         u8 val;
 211
 212 #if 0
 213         pr_info("RS_COR_STAT: 0x%02X\n",
 214                 nxt6000_readreg(fe, RS_COR_STAT));
 215         pr_info("VIT_SYNC_STATUS: 0x%02X\n",
 216                 nxt6000_readreg(fe, VIT_SYNC_STATUS));
 217         pr_info("OFDM_COR_STAT: 0x%02X\n",
 218                 nxt6000_readreg(fe, OFDM_COR_STAT));
 219         pr_info("OFDM_SYR_STAT: 0x%02X\n",
 220                 nxt6000_readreg(fe, OFDM_SYR_STAT));
 221         pr_info("OFDM_TPS_RCVD_1: 0x%02X\n",
 222                 nxt6000_readreg(fe, OFDM_TPS_RCVD_1));
 223         pr_info("OFDM_TPS_RCVD_2: 0x%02X\n",
 224                 nxt6000_readreg(fe, OFDM_TPS_RCVD_2));
 225         pr_info("OFDM_TPS_RCVD_3: 0x%02X\n",
 226                 nxt6000_readreg(fe, OFDM_TPS_RCVD_3));
 227         pr_info("OFDM_TPS_RCVD_4: 0x%02X\n",
 228                 nxt6000_readreg(fe, OFDM_TPS_RCVD_4));
 229         pr_info("OFDM_TPS_RESERVED_1: 0x%02X\n",
 230                 nxt6000_readreg(fe, OFDM_TPS_RESERVED_1));
 231         pr_info("OFDM_TPS_RESERVED_2: 0x%02X\n",
 232                 nxt6000_readreg(fe, OFDM_TPS_RESERVED_2));
 233 #endif
 234         pr_info("NXT6000 status:");
 235
 236         val = nxt6000_readreg(state, RS_COR_STAT);
 237
 238         pr_cont(" DATA DESCR LOCK: %d,", val & 0x01);
 239         pr_cont(" DATA SYNC LOCK: %d,", (val >> 1) & 0x01);
 240
 241         val = nxt6000_readreg(state, VIT_SYNC_STATUS);
 242
 243         pr_cont(" VITERBI LOCK: %d,", (val >> 7) & 0x01);
 244
 245         switch ((val >> 4) & 0x07) {
 246
 247         case 0x00:
 248                 pr_cont(" VITERBI CODERATE: 1/2,");
 249                 break;
 250
 251         case 0x01:
 252                 pr_cont(" VITERBI CODERATE: 2/3,");
 253                 break;
 254
 255         case 0x02:
 256                 pr_cont(" VITERBI CODERATE: 3/4,");
 257                 break;
 258
 259         case 0x03:
 260                 pr_cont(" VITERBI CODERATE: 5/6,");
 261                 break;
 262
 263         case 0x04:
 264                 pr_cont(" VITERBI CODERATE: 7/8,");
 265                 break;
 266
 267         default:
 268                 pr_cont(" VITERBI CODERATE: Reserved,");
 269
 270         }
 271
 272         val = nxt6000_readreg(state, OFDM_COR_STAT);
 273
 274         pr_cont(" CHCTrack: %d,", (val >> 7) & 0x01);
 275         pr_cont(" TPSLock: %d,", (val >> 6) & 0x01);
 276         pr_cont(" SYRLock: %d,", (val >> 5) & 0x01);
 277         pr_cont(" AGCLock: %d,", (val >> 4) & 0x01);
 278
 279         switch (val & 0x0F) {
 280
 281         case 0x00:
 282                 pr_cont(" CoreState: IDLE,");
 283                 break;
 284
 285         case 0x02:
 286                 pr_cont(" CoreState: WAIT_AGC,");
 287                 break;
 288
 289         case 0x03:
 290                 pr_cont(" CoreState: WAIT_SYR,");
 291                 break;
 292
 293         case 0x04:
 294                 pr_cont(" CoreState: WAIT_PPM,");
 295                 break;
 296
 297         case 0x01:
 298                 pr_cont(" CoreState: WAIT_TRL,");
 299                 break;
 300
 301         case 0x05:
 302                 pr_cont(" CoreState: WAIT_TPS,");
 303                 break;
 304
 305         case 0x06:
 306                 pr_cont(" CoreState: MONITOR_TPS,");
 307                 break;
 308
 309         default:
 310                 pr_cont(" CoreState: Reserved,");
 311
 312         }
 313
 314         val = nxt6000_readreg(state, OFDM_SYR_STAT);
 315
 316         pr_cont(" SYRLock: %d,", (val >> 4) & 0x01);
 317         pr_cont(" SYRMode: %s,", (val >> 2) & 0x01 ? "8K" : "2K");
 318
 319         switch ((val >> 4) & 0x03) {
 320
 321         case 0x00:
 322                 pr_cont(" SYRGuard: 1/32,");
 323                 break;
 324
 325         case 0x01:
 326                 pr_cont(" SYRGuard: 1/16,");
 327                 break;
 328
 329         case 0x02:
 330                 pr_cont(" SYRGuard: 1/8,");
 331                 break;
 332
 333         case 0x03:
 334                 pr_cont(" SYRGuard: 1/4,");
 335                 break;
 336         }
 337
 338         val = nxt6000_readreg(state, OFDM_TPS_RCVD_3);
 339
 340         switch ((val >> 4) & 0x07) {
 341
 342         case 0x00:
 343                 pr_cont(" TPSLP: 1/2,");
 344                 break;
 345
 346         case 0x01:
 347                 pr_cont(" TPSLP: 2/3,");
 348                 break;
 349
 350         case 0x02:
 351                 pr_cont(" TPSLP: 3/4,");
 352                 break;
 353
 354         case 0x03:
 355                 pr_cont(" TPSLP: 5/6,");
 356                 break;
 357
 358         case 0x04:
 359                 pr_cont(" TPSLP: 7/8,");
 360                 break;
 361
 362         default:
 363                 pr_cont(" TPSLP: Reserved,");
 364
 365         }
 366
 367         switch (val & 0x07) {
 368
 369         case 0x00:
 370                 pr_cont(" TPSHP: 1/2,");
 371                 break;
 372
 373         case 0x01:
 374                 pr_cont(" TPSHP: 2/3,");
 375                 break;
 376
 377         case 0x02:
 378                 pr_cont(" TPSHP: 3/4,");
 379                 break;
 380
 381         case 0x03:
 382                 pr_cont(" TPSHP: 5/6,");
 383                 break;
 384
 385         case 0x04:
 386                 pr_cont(" TPSHP: 7/8,");
 387                 break;
 388
 389         default:
 390                 pr_cont(" TPSHP: Reserved,");
 391
 392         }
 393
 394         val = nxt6000_readreg(state, OFDM_TPS_RCVD_4);
 395
 396         pr_cont(" TPSMode: %s,", val & 0x01 ? "8K" : "2K");
 397
 398         switch ((val >> 4) & 0x03) {
 399
 400         case 0x00:
 401                 pr_cont(" TPSGuard: 1/32,");
 402                 break;
 403
 404         case 0x01:
 405                 pr_cont(" TPSGuard: 1/16,");
 406                 break;
 407
 408         case 0x02:
 409                 pr_cont(" TPSGuard: 1/8,");
 410                 break;
 411
 412         case 0x03:
 413                 pr_cont(" TPSGuard: 1/4,");
 414                 break;
 415
 416         }
 417
 418         /* Strange magic required to gain access to RF_AGC_STATUS */
 419         nxt6000_readreg(state, RF_AGC_VAL_1);
 420         val = nxt6000_readreg(state, RF_AGC_STATUS);
 421         val = nxt6000_readreg(state, RF_AGC_STATUS);
 422
 423         pr_cont(" RF AGC LOCK: %d,", (val >> 4) & 0x01);
 424         pr_cont("\n");
 425 }
 426
 427 static int nxt6000_read_status(struct dvb_frontend *fe, enum fe_status *status)
 428 {
 429         u8 core_status;
 430         struct nxt6000_state* state = fe->demodulator_priv;
 431
 432         *status = 0;
 433
 434         core_status = nxt6000_readreg(state, OFDM_COR_STAT);
 435
 436         if (core_status & AGCLOCKED)
 437                 *status |= FE_HAS_SIGNAL;
 438
 439         if (nxt6000_readreg(state, OFDM_SYR_STAT) & GI14_SYR_LOCK)
 440                 *status |= FE_HAS_CARRIER;
 441
 442         if (nxt6000_readreg(state, VIT_SYNC_STATUS) & VITINSYNC)
 443                 *status |= FE_HAS_VITERBI;
 444
 445         if (nxt6000_readreg(state, RS_COR_STAT) & RSCORESTATUS)
 446                 *status |= FE_HAS_SYNC;
 447
 448         if ((core_status & TPSLOCKED) && (*status == (FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)))
 449                 *status |= FE_HAS_LOCK;
 450
 451         if (debug)
 452                 nxt6000_dump_status(state);
 453
 454         return 0;
 455 }
 456
 457 static int nxt6000_init(struct dvb_frontend* fe)
 458 {
 459         struct nxt6000_state* state = fe->demodulator_priv;
 460
 461         nxt6000_reset(state);
 462         nxt6000_setup(fe);
 463
 464         return 0;
 465 }
 466
 467 static int nxt6000_set_frontend(struct dvb_frontend *fe)
 468 {
 469         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 470         struct nxt6000_state* state = fe->demodulator_priv;
 471         int result;
 472
 473         if (fe->ops.tuner_ops.set_params) {
 474                 fe->ops.tuner_ops.set_params(fe);
 475                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 476         }
 477
 478         result = nxt6000_set_bandwidth(state, p->bandwidth_hz);
 479         if (result < 0)
 480                 return result;
 481
 482         result = nxt6000_set_guard_interval(state, p->guard_interval);
 483         if (result < 0)
 484                 return result;
 485
 486         result = nxt6000_set_transmission_mode(state, p->transmission_mode);
 487         if (result < 0)
 488                 return result;
 489
 490         result = nxt6000_set_inversion(state, p->inversion);
 491         if (result < 0)
 492                 return result;
 493
 494         msleep(500);
 495         return 0;
 496 }
 497
 498 static void nxt6000_release(struct dvb_frontend* fe)
 499 {
 500         struct nxt6000_state* state = fe->demodulator_priv;
 501         kfree(state);
 502 }
 503
 504 static int nxt6000_read_snr(struct dvb_frontend* fe, u16* snr)
 505 {
 506         struct nxt6000_state* state = fe->demodulator_priv;
 507
 508         *snr = nxt6000_readreg( state, OFDM_CHC_SNR) / 8;
 509
 510         return 0;
 511 }
 512
 513 static int nxt6000_read_ber(struct dvb_frontend* fe, u32* ber)
 514 {
 515         struct nxt6000_state* state = fe->demodulator_priv;
 516
 517         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18 );
 518
 519         *ber = (nxt6000_readreg( state, VIT_BER_1 ) << 8 ) |
 520                 nxt6000_readreg( state, VIT_BER_0 );
 521
 522         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18); // Clear BER Done interrupts
 523
 524         return 0;
 525 }
 526
 527 static int nxt6000_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 528 {
 529         struct nxt6000_state* state = fe->demodulator_priv;
 530
 531         *signal_strength = (short) (511 -
 532                 (nxt6000_readreg(state, AGC_GAIN_1) +
 533                 ((nxt6000_readreg(state, AGC_GAIN_2) & 0x03) << 8)));
 534
 535         return 0;
 536 }
 537
 538 static int nxt6000_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 539 {
 540         tune->min_delay_ms = 500;
 541         return 0;
 542 }
 543
 544 static int nxt6000_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 545 {
 546         struct nxt6000_state* state = fe->demodulator_priv;
 547
 548         if (enable) {
 549                 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x01);
 550         } else {
 551                 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x00);
 552         }
 553 }
 554
 555 static const struct dvb_frontend_ops nxt6000_ops;
 556
 557 struct dvb_frontend* nxt6000_attach(const struct nxt6000_config* config,
 558                                     struct i2c_adapter* i2c)
 559 {
 560         struct nxt6000_state* state = NULL;
 561
 562         /* allocate memory for the internal state */
 563         state = kzalloc(sizeof(struct nxt6000_state), GFP_KERNEL);
 564         if (state == NULL) goto error;
 565
 566         /* setup the state */
 567         state->config = config;
 568         state->i2c = i2c;
 569
 570         /* check if the demod is there */
 571         if (nxt6000_readreg(state, OFDM_MSC_REV) != NXT6000ASICDEVICE) goto error;
 572
 573         /* create dvb_frontend */
 574         memcpy(&state->frontend.ops, &nxt6000_ops, sizeof(struct dvb_frontend_ops));
 575         state->frontend.demodulator_priv = state;
 576         return &state->frontend;
 577
 578 error:
 579         kfree(state);
 580         return NULL;
 581 }
 582
 583 static const struct dvb_frontend_ops nxt6000_ops = {
 584         .delsys = { SYS_DVBT },
 585         .info = {
 586                 .name = "NxtWave NXT6000 DVB-T",
 587                 .frequency_min_hz = 0,
 588                 .frequency_max_hz = 863250 * kHz,
 589                 .frequency_stepsize_hz = 62500,
 590                 /*.frequency_tolerance = *//* FIXME: 12% of SR */
 591                 .symbol_rate_min = 0,   /* FIXME */
 592                 .symbol_rate_max = 9360000,     /* FIXME */
 593                 .symbol_rate_tolerance = 4000,
 594                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 595                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 596                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 597                         FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 598                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 599                         FE_CAN_HIERARCHY_AUTO,
 600         },
 601
 602         .release = nxt6000_release,
 603
 604         .init = nxt6000_init,
 605         .i2c_gate_ctrl = nxt6000_i2c_gate_ctrl,
 606
 607         .get_tune_settings = nxt6000_fe_get_tune_settings,
 608
 609         .set_frontend = nxt6000_set_frontend,
 610
 611         .read_status = nxt6000_read_status,
 612         .read_ber = nxt6000_read_ber,
 613         .read_signal_strength = nxt6000_read_signal_strength,
 614         .read_snr = nxt6000_read_snr,
 615 };
 616
 617 module_param(debug, int, 0644);
 618 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 619
 620 MODULE_DESCRIPTION("NxtWave NXT6000 DVB-T demodulator driver");
 621 MODULE_AUTHOR("Florian Schirmer");
 622 MODULE_LICENSE("GPL");
 623
 624 EXPORT_SYMBOL(nxt6000_attach);