drivers/media/dvb/frontends/nxt6000.c

   1 /*
   2         NxtWave Communications - NXT6000 demodulator driver
   3
   4     Copyright (C) 2002-2003 Florian Schirmer <jolt@tuxbox.org>
   5     Copyright (C) 2003 Paul Andreassen <paul@andreassen.com.au>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/slab.h>
  27
  28 #include "dvb_frontend.h"
  29 #include "nxt6000_priv.h"
  30 #include "nxt6000.h"
  31
  32
  33
  34 struct nxt6000_state {
  35         struct i2c_adapter* i2c;
  36         /* configuration settings */
  37         const struct nxt6000_config* config;
  38         struct dvb_frontend frontend;
  39 };
  40
  41 static int debug;
  42 #define dprintk if (debug) printk
  43
  44 static int nxt6000_writereg(struct nxt6000_state* state, u8 reg, u8 data)
  45 {
  46         u8 buf[] = { reg, data };
  47         struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 };
  48         int ret;
  49
  50         if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1)
  51                 dprintk("nxt6000: nxt6000_write error (reg: 0x%02X, data: 0x%02X, ret: %d)\n", reg, data, ret);
  52
  53         return (ret != 1) ? -EIO : 0;
  54 }
  55
  56 static u8 nxt6000_readreg(struct nxt6000_state* state, u8 reg)
  57 {
  58         int ret;
  59         u8 b0[] = { reg };
  60         u8 b1[] = { 0 };
  61         struct i2c_msg msgs[] = {
  62                 {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1},
  63                 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
  64         };
  65
  66         ret = i2c_transfer(state->i2c, msgs, 2);
  67
  68         if (ret != 2)
  69                 dprintk("nxt6000: nxt6000_read error (reg: 0x%02X, ret: %d)\n", reg, ret);
  70
  71         return b1[0];
  72 }
  73
  74 static void nxt6000_reset(struct nxt6000_state* state)
  75 {
  76         u8 val;
  77
  78         val = nxt6000_readreg(state, OFDM_COR_CTL);
  79
  80         nxt6000_writereg(state, OFDM_COR_CTL, val & ~COREACT);
  81         nxt6000_writereg(state, OFDM_COR_CTL, val | COREACT);
  82 }
  83
  84 static int nxt6000_set_bandwidth(struct nxt6000_state *state, u32 bandwidth)
  85 {
  86         u16 nominal_rate;
  87         int result;
  88
  89         switch (bandwidth) {
  90         case 6000000:
  91                 nominal_rate = 0x55B7;
  92                 break;
  93
  94         case 7000000:
  95                 nominal_rate = 0x6400;
  96                 break;
  97
  98         case 8000000:
  99                 nominal_rate = 0x7249;
 100                 break;
 101
 102         default:
 103                 return -EINVAL;
 104         }
 105
 106         if ((result = nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, nominal_rate & 0xFF)) < 0)
 107                 return result;
 108
 109         return nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, (nominal_rate >> 8) & 0xFF);
 110 }
 111
 112 static int nxt6000_set_guard_interval(struct nxt6000_state* state, fe_guard_interval_t guard_interval)
 113 {
 114         switch (guard_interval) {
 115
 116         case GUARD_INTERVAL_1_32:
 117                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x00 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 118
 119         case GUARD_INTERVAL_1_16:
 120                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x01 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 121
 122         case GUARD_INTERVAL_AUTO:
 123         case GUARD_INTERVAL_1_8:
 124                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x02 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 125
 126         case GUARD_INTERVAL_1_4:
 127                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x03 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 128
 129         default:
 130                 return -EINVAL;
 131         }
 132 }
 133
 134 static int nxt6000_set_inversion(struct nxt6000_state* state, fe_spectral_inversion_t inversion)
 135 {
 136         switch (inversion) {
 137
 138         case INVERSION_OFF:
 139                 return nxt6000_writereg(state, OFDM_ITB_CTL, 0x00);
 140
 141         case INVERSION_ON:
 142                 return nxt6000_writereg(state, OFDM_ITB_CTL, ITBINV);
 143
 144         default:
 145                 return -EINVAL;
 146
 147         }
 148 }
 149
 150 static int nxt6000_set_transmission_mode(struct nxt6000_state* state, fe_transmit_mode_t transmission_mode)
 151 {
 152         int result;
 153
 154         switch (transmission_mode) {
 155
 156         case TRANSMISSION_MODE_2K:
 157                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x00 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 158                         return result;
 159
 160                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x00 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 161
 162         case TRANSMISSION_MODE_8K:
 163         case TRANSMISSION_MODE_AUTO:
 164                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x02 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 165                         return result;
 166
 167                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x01 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 168
 169         default:
 170                 return -EINVAL;
 171
 172         }
 173 }
 174
 175 static void nxt6000_setup(struct dvb_frontend* fe)
 176 {
 177         struct nxt6000_state* state = fe->demodulator_priv;
 178
 179         nxt6000_writereg(state, RS_COR_SYNC_PARAM, SYNC_PARAM);
 180         nxt6000_writereg(state, BER_CTRL, /*(1 << 2) | */ (0x01 << 1) | 0x01);
 181         nxt6000_writereg(state, VIT_BERTIME_2, 0x00);  // BER Timer = 0x000200 * 256 = 131072 bits
 182         nxt6000_writereg(state, VIT_BERTIME_1, 0x02);  //
 183         nxt6000_writereg(state, VIT_BERTIME_0, 0x00);  //
 184         nxt6000_writereg(state, VIT_COR_INTEN, 0x98); // Enable BER interrupts
 185         nxt6000_writereg(state, VIT_COR_CTL, 0x82);   // Enable BER measurement
 186         nxt6000_writereg(state, VIT_COR_CTL, VIT_COR_RESYNC | 0x02 );
 187         nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F));
 188         nxt6000_writereg(state, OFDM_COR_MODEGUARD, FORCEMODE8K | 0x02);
 189         nxt6000_writereg(state, OFDM_AGC_CTL, AGCLAST | INITIAL_AGC_BW);
 190         nxt6000_writereg(state, OFDM_ITB_FREQ_1, 0x06);
 191         nxt6000_writereg(state, OFDM_ITB_FREQ_2, 0x31);
 192         nxt6000_writereg(state, OFDM_CAS_CTL, (0x01 << 7) | (0x02 << 3) | 0x04);
 193         nxt6000_writereg(state, CAS_FREQ, 0xBB);        /* CHECKME */
 194         nxt6000_writereg(state, OFDM_SYR_CTL, 1 << 2);
 195         nxt6000_writereg(state, OFDM_PPM_CTL_1, PPM256);
 196         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, 0x49);
 197         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, 0x72);
 198         nxt6000_writereg(state, ANALOG_CONTROL_0, 1 << 5);
 199         nxt6000_writereg(state, EN_DMD_RACQ, (1 << 7) | (3 << 4) | 2);
 200         nxt6000_writereg(state, DIAG_CONFIG, TB_SET);
 201
 202         if (state->config->clock_inversion)
 203                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, CLKINVERSION);
 204         else
 205                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, 0);
 206
 207         nxt6000_writereg(state, TS_FORMAT, 0);
 208 }
 209
 210 static void nxt6000_dump_status(struct nxt6000_state *state)
 211 {
 212         u8 val;
 213
 214 /*
 215         printk("RS_COR_STAT: 0x%02X\n", nxt6000_readreg(fe, RS_COR_STAT));
 216         printk("VIT_SYNC_STATUS: 0x%02X\n", nxt6000_readreg(fe, VIT_SYNC_STATUS));
 217         printk("OFDM_COR_STAT: 0x%02X\n", nxt6000_readreg(fe, OFDM_COR_STAT));
 218         printk("OFDM_SYR_STAT: 0x%02X\n", nxt6000_readreg(fe, OFDM_SYR_STAT));
 219         printk("OFDM_TPS_RCVD_1: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_1));
 220         printk("OFDM_TPS_RCVD_2: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_2));
 221         printk("OFDM_TPS_RCVD_3: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_3));
 222         printk("OFDM_TPS_RCVD_4: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_4));
 223         printk("OFDM_TPS_RESERVED_1: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RESERVED_1));
 224         printk("OFDM_TPS_RESERVED_2: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RESERVED_2));
 225 */
 226         printk("NXT6000 status:");
 227
 228         val = nxt6000_readreg(state, RS_COR_STAT);
 229
 230         printk(" DATA DESCR LOCK: %d,", val & 0x01);
 231         printk(" DATA SYNC LOCK: %d,", (val >> 1) & 0x01);
 232
 233         val = nxt6000_readreg(state, VIT_SYNC_STATUS);
 234
 235         printk(" VITERBI LOCK: %d,", (val >> 7) & 0x01);
 236
 237         switch ((val >> 4) & 0x07) {
 238
 239         case 0x00:
 240                 printk(" VITERBI CODERATE: 1/2,");
 241                 break;
 242
 243         case 0x01:
 244                 printk(" VITERBI CODERATE: 2/3,");
 245                 break;
 246
 247         case 0x02:
 248                 printk(" VITERBI CODERATE: 3/4,");
 249                 break;
 250
 251         case 0x03:
 252                 printk(" VITERBI CODERATE: 5/6,");
 253                 break;
 254
 255         case 0x04:
 256                 printk(" VITERBI CODERATE: 7/8,");
 257                 break;
 258
 259         default:
 260                 printk(" VITERBI CODERATE: Reserved,");
 261
 262         }
 263
 264         val = nxt6000_readreg(state, OFDM_COR_STAT);
 265
 266         printk(" CHCTrack: %d,", (val >> 7) & 0x01);
 267         printk(" TPSLock: %d,", (val >> 6) & 0x01);
 268         printk(" SYRLock: %d,", (val >> 5) & 0x01);
 269         printk(" AGCLock: %d,", (val >> 4) & 0x01);
 270
 271         switch (val & 0x0F) {
 272
 273         case 0x00:
 274                 printk(" CoreState: IDLE,");
 275                 break;
 276
 277         case 0x02:
 278                 printk(" CoreState: WAIT_AGC,");
 279                 break;
 280
 281         case 0x03:
 282                 printk(" CoreState: WAIT_SYR,");
 283                 break;
 284
 285         case 0x04:
 286                 printk(" CoreState: WAIT_PPM,");
 287                 break;
 288
 289         case 0x01:
 290                 printk(" CoreState: WAIT_TRL,");
 291                 break;
 292
 293         case 0x05:
 294                 printk(" CoreState: WAIT_TPS,");
 295                 break;
 296
 297         case 0x06:
 298                 printk(" CoreState: MONITOR_TPS,");
 299                 break;
 300
 301         default:
 302                 printk(" CoreState: Reserved,");
 303
 304         }
 305
 306         val = nxt6000_readreg(state, OFDM_SYR_STAT);
 307
 308         printk(" SYRLock: %d,", (val >> 4) & 0x01);
 309         printk(" SYRMode: %s,", (val >> 2) & 0x01 ? "8K" : "2K");
 310
 311         switch ((val >> 4) & 0x03) {
 312
 313         case 0x00:
 314                 printk(" SYRGuard: 1/32,");
 315                 break;
 316
 317         case 0x01:
 318                 printk(" SYRGuard: 1/16,");
 319                 break;
 320
 321         case 0x02:
 322                 printk(" SYRGuard: 1/8,");
 323                 break;
 324
 325         case 0x03:
 326                 printk(" SYRGuard: 1/4,");
 327                 break;
 328         }
 329
 330         val = nxt6000_readreg(state, OFDM_TPS_RCVD_3);
 331
 332         switch ((val >> 4) & 0x07) {
 333
 334         case 0x00:
 335                 printk(" TPSLP: 1/2,");
 336                 break;
 337
 338         case 0x01:
 339                 printk(" TPSLP: 2/3,");
 340                 break;
 341
 342         case 0x02:
 343                 printk(" TPSLP: 3/4,");
 344                 break;
 345
 346         case 0x03:
 347                 printk(" TPSLP: 5/6,");
 348                 break;
 349
 350         case 0x04:
 351                 printk(" TPSLP: 7/8,");
 352                 break;
 353
 354         default:
 355                 printk(" TPSLP: Reserved,");
 356
 357         }
 358
 359         switch (val & 0x07) {
 360
 361         case 0x00:
 362                 printk(" TPSHP: 1/2,");
 363                 break;
 364
 365         case 0x01:
 366                 printk(" TPSHP: 2/3,");
 367                 break;
 368
 369         case 0x02:
 370                 printk(" TPSHP: 3/4,");
 371                 break;
 372
 373         case 0x03:
 374                 printk(" TPSHP: 5/6,");
 375                 break;
 376
 377         case 0x04:
 378                 printk(" TPSHP: 7/8,");
 379                 break;
 380
 381         default:
 382                 printk(" TPSHP: Reserved,");
 383
 384         }
 385
 386         val = nxt6000_readreg(state, OFDM_TPS_RCVD_4);
 387
 388         printk(" TPSMode: %s,", val & 0x01 ? "8K" : "2K");
 389
 390         switch ((val >> 4) & 0x03) {
 391
 392         case 0x00:
 393                 printk(" TPSGuard: 1/32,");
 394                 break;
 395
 396         case 0x01:
 397                 printk(" TPSGuard: 1/16,");
 398                 break;
 399
 400         case 0x02:
 401                 printk(" TPSGuard: 1/8,");
 402                 break;
 403
 404         case 0x03:
 405                 printk(" TPSGuard: 1/4,");
 406                 break;
 407
 408         }
 409
 410         /* Strange magic required to gain access to RF_AGC_STATUS */
 411         nxt6000_readreg(state, RF_AGC_VAL_1);
 412         val = nxt6000_readreg(state, RF_AGC_STATUS);
 413         val = nxt6000_readreg(state, RF_AGC_STATUS);
 414
 415         printk(" RF AGC LOCK: %d,", (val >> 4) & 0x01);
 416         printk("\n");
 417 }
 418
 419 static int nxt6000_read_status(struct dvb_frontend* fe, fe_status_t* status)
 420 {
 421         u8 core_status;
 422         struct nxt6000_state* state = fe->demodulator_priv;
 423
 424         *status = 0;
 425
 426         core_status = nxt6000_readreg(state, OFDM_COR_STAT);
 427
 428         if (core_status & AGCLOCKED)
 429                 *status |= FE_HAS_SIGNAL;
 430
 431         if (nxt6000_readreg(state, OFDM_SYR_STAT) & GI14_SYR_LOCK)
 432                 *status |= FE_HAS_CARRIER;
 433
 434         if (nxt6000_readreg(state, VIT_SYNC_STATUS) & VITINSYNC)
 435                 *status |= FE_HAS_VITERBI;
 436
 437         if (nxt6000_readreg(state, RS_COR_STAT) & RSCORESTATUS)
 438                 *status |= FE_HAS_SYNC;
 439
 440         if ((core_status & TPSLOCKED) && (*status == (FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)))
 441                 *status |= FE_HAS_LOCK;
 442
 443         if (debug)
 444                 nxt6000_dump_status(state);
 445
 446         return 0;
 447 }
 448
 449 static int nxt6000_init(struct dvb_frontend* fe)
 450 {
 451         struct nxt6000_state* state = fe->demodulator_priv;
 452
 453         nxt6000_reset(state);
 454         nxt6000_setup(fe);
 455
 456         return 0;
 457 }
 458
 459 static int nxt6000_set_frontend(struct dvb_frontend *fe)
 460 {
 461         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 462         struct nxt6000_state* state = fe->demodulator_priv;
 463         int result;
 464
 465         if (fe->ops.tuner_ops.set_params) {
 466                 fe->ops.tuner_ops.set_params(fe);
 467                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 468         }
 469
 470         result = nxt6000_set_bandwidth(state, p->bandwidth_hz);
 471         if (result < 0)
 472                 return result;
 473
 474         result = nxt6000_set_guard_interval(state, p->guard_interval);
 475         if (result < 0)
 476                 return result;
 477
 478         result = nxt6000_set_transmission_mode(state, p->transmission_mode);
 479         if (result < 0)
 480                 return result;
 481
 482         result = nxt6000_set_inversion(state, p->inversion);
 483         if (result < 0)
 484                 return result;
 485
 486         msleep(500);
 487         return 0;
 488 }
 489
 490 static void nxt6000_release(struct dvb_frontend* fe)
 491 {
 492         struct nxt6000_state* state = fe->demodulator_priv;
 493         kfree(state);
 494 }
 495
 496 static int nxt6000_read_snr(struct dvb_frontend* fe, u16* snr)
 497 {
 498         struct nxt6000_state* state = fe->demodulator_priv;
 499
 500         *snr = nxt6000_readreg( state, OFDM_CHC_SNR) / 8;
 501
 502         return 0;
 503 }
 504
 505 static int nxt6000_read_ber(struct dvb_frontend* fe, u32* ber)
 506 {
 507         struct nxt6000_state* state = fe->demodulator_priv;
 508
 509         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18 );
 510
 511         *ber = (nxt6000_readreg( state, VIT_BER_1 ) << 8 ) |
 512                 nxt6000_readreg( state, VIT_BER_0 );
 513
 514         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18); // Clear BER Done interrupts
 515
 516         return 0;
 517 }
 518
 519 static int nxt6000_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 520 {
 521         struct nxt6000_state* state = fe->demodulator_priv;
 522
 523         *signal_strength = (short) (511 -
 524                 (nxt6000_readreg(state, AGC_GAIN_1) +
 525                 ((nxt6000_readreg(state, AGC_GAIN_2) & 0x03) << 8)));
 526
 527         return 0;
 528 }
 529
 530 static int nxt6000_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 531 {
 532         tune->min_delay_ms = 500;
 533         return 0;
 534 }
 535
 536 static int nxt6000_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 537 {
 538         struct nxt6000_state* state = fe->demodulator_priv;
 539
 540         if (enable) {
 541                 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x01);
 542         } else {
 543                 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x00);
 544         }
 545 }
 546
 547 static struct dvb_frontend_ops nxt6000_ops;
 548
 549 struct dvb_frontend* nxt6000_attach(const struct nxt6000_config* config,
 550                                     struct i2c_adapter* i2c)
 551 {
 552         struct nxt6000_state* state = NULL;
 553
 554         /* allocate memory for the internal state */
 555         state = kzalloc(sizeof(struct nxt6000_state), GFP_KERNEL);
 556         if (state == NULL) goto error;
 557
 558         /* setup the state */
 559         state->config = config;
 560         state->i2c = i2c;
 561
 562         /* check if the demod is there */
 563         if (nxt6000_readreg(state, OFDM_MSC_REV) != NXT6000ASICDEVICE) goto error;
 564
 565         /* create dvb_frontend */
 566         memcpy(&state->frontend.ops, &nxt6000_ops, sizeof(struct dvb_frontend_ops));
 567         state->frontend.demodulator_priv = state;
 568         return &state->frontend;
 569
 570 error:
 571         kfree(state);
 572         return NULL;
 573 }
 574
 575 static struct dvb_frontend_ops nxt6000_ops = {
 576         .delsys = { SYS_DVBT },
 577         .info = {
 578                 .name = "NxtWave NXT6000 DVB-T",
 579                 .frequency_min = 0,
 580                 .frequency_max = 863250000,
 581                 .frequency_stepsize = 62500,
 582                 /*.frequency_tolerance = *//* FIXME: 12% of SR */
 583                 .symbol_rate_min = 0,   /* FIXME */
 584                 .symbol_rate_max = 9360000,     /* FIXME */
 585                 .symbol_rate_tolerance = 4000,
 586                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 587                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 588                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 589                         FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 590                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 591                         FE_CAN_HIERARCHY_AUTO,
 592         },
 593
 594         .release = nxt6000_release,
 595
 596         .init = nxt6000_init,
 597         .i2c_gate_ctrl = nxt6000_i2c_gate_ctrl,
 598
 599         .get_tune_settings = nxt6000_fe_get_tune_settings,
 600
 601         .set_frontend = nxt6000_set_frontend,
 602
 603         .read_status = nxt6000_read_status,
 604         .read_ber = nxt6000_read_ber,
 605         .read_signal_strength = nxt6000_read_signal_strength,
 606         .read_snr = nxt6000_read_snr,
 607 };
 608
 609 module_param(debug, int, 0644);
 610 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 611
 612 MODULE_DESCRIPTION("NxtWave NXT6000 DVB-T demodulator driver");
 613 MODULE_AUTHOR("Florian Schirmer");
 614 MODULE_LICENSE("GPL");
 615
 616 EXPORT_SYMBOL(nxt6000_attach);