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,
 113                                       enum fe_guard_interval guard_interval)
 114 {
 115         switch (guard_interval) {
 116
 117         case GUARD_INTERVAL_1_32:
 118                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x00 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 119
 120         case GUARD_INTERVAL_1_16:
 121                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x01 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 122
 123         case GUARD_INTERVAL_AUTO:
 124         case GUARD_INTERVAL_1_8:
 125                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x02 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 126
 127         case GUARD_INTERVAL_1_4:
 128                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x03 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 129
 130         default:
 131                 return -EINVAL;
 132         }
 133 }
 134
 135 static int nxt6000_set_inversion(struct nxt6000_state *state,
 136                                  enum fe_spectral_inversion inversion)
 137 {
 138         switch (inversion) {
 139
 140         case INVERSION_OFF:
 141                 return nxt6000_writereg(state, OFDM_ITB_CTL, 0x00);
 142
 143         case INVERSION_ON:
 144                 return nxt6000_writereg(state, OFDM_ITB_CTL, ITBINV);
 145
 146         default:
 147                 return -EINVAL;
 148
 149         }
 150 }
 151
 152 static int
 153 nxt6000_set_transmission_mode(struct nxt6000_state *state,
 154                               enum fe_transmit_mode transmission_mode)
 155 {
 156         int result;
 157
 158         switch (transmission_mode) {
 159
 160         case TRANSMISSION_MODE_2K:
 161                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x00 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 162                         return result;
 163
 164                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x00 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 165
 166         case TRANSMISSION_MODE_8K:
 167         case TRANSMISSION_MODE_AUTO:
 168                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x02 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 169                         return result;
 170
 171                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x01 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 172
 173         default:
 174                 return -EINVAL;
 175
 176         }
 177 }
 178
 179 static void nxt6000_setup(struct dvb_frontend* fe)
 180 {
 181         struct nxt6000_state* state = fe->demodulator_priv;
 182
 183         nxt6000_writereg(state, RS_COR_SYNC_PARAM, SYNC_PARAM);
 184         nxt6000_writereg(state, BER_CTRL, /*(1 << 2) | */ (0x01 << 1) | 0x01);
 185         nxt6000_writereg(state, VIT_BERTIME_2, 0x00);  // BER Timer = 0x000200 * 256 = 131072 bits
 186         nxt6000_writereg(state, VIT_BERTIME_1, 0x02);  //
 187         nxt6000_writereg(state, VIT_BERTIME_0, 0x00);  //
 188         nxt6000_writereg(state, VIT_COR_INTEN, 0x98); // Enable BER interrupts
 189         nxt6000_writereg(state, VIT_COR_CTL, 0x82);   // Enable BER measurement
 190         nxt6000_writereg(state, VIT_COR_CTL, VIT_COR_RESYNC | 0x02 );
 191         nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F));
 192         nxt6000_writereg(state, OFDM_COR_MODEGUARD, FORCEMODE8K | 0x02);
 193         nxt6000_writereg(state, OFDM_AGC_CTL, AGCLAST | INITIAL_AGC_BW);
 194         nxt6000_writereg(state, OFDM_ITB_FREQ_1, 0x06);
 195         nxt6000_writereg(state, OFDM_ITB_FREQ_2, 0x31);
 196         nxt6000_writereg(state, OFDM_CAS_CTL, (0x01 << 7) | (0x02 << 3) | 0x04);
 197         nxt6000_writereg(state, CAS_FREQ, 0xBB);        /* CHECKME */
 198         nxt6000_writereg(state, OFDM_SYR_CTL, 1 << 2);
 199         nxt6000_writereg(state, OFDM_PPM_CTL_1, PPM256);
 200         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, 0x49);
 201         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, 0x72);
 202         nxt6000_writereg(state, ANALOG_CONTROL_0, 1 << 5);
 203         nxt6000_writereg(state, EN_DMD_RACQ, (1 << 7) | (3 << 4) | 2);
 204         nxt6000_writereg(state, DIAG_CONFIG, TB_SET);
 205
 206         if (state->config->clock_inversion)
 207                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, CLKINVERSION);
 208         else
 209                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, 0);
 210
 211         nxt6000_writereg(state, TS_FORMAT, 0);
 212 }
 213
 214 static void nxt6000_dump_status(struct nxt6000_state *state)
 215 {
 216         u8 val;
 217
 218 /*
 219         printk("RS_COR_STAT: 0x%02X\n", nxt6000_readreg(fe, RS_COR_STAT));
 220         printk("VIT_SYNC_STATUS: 0x%02X\n", nxt6000_readreg(fe, VIT_SYNC_STATUS));
 221         printk("OFDM_COR_STAT: 0x%02X\n", nxt6000_readreg(fe, OFDM_COR_STAT));
 222         printk("OFDM_SYR_STAT: 0x%02X\n", nxt6000_readreg(fe, OFDM_SYR_STAT));
 223         printk("OFDM_TPS_RCVD_1: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_1));
 224         printk("OFDM_TPS_RCVD_2: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_2));
 225         printk("OFDM_TPS_RCVD_3: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_3));
 226         printk("OFDM_TPS_RCVD_4: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_4));
 227         printk("OFDM_TPS_RESERVED_1: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RESERVED_1));
 228         printk("OFDM_TPS_RESERVED_2: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RESERVED_2));
 229 */
 230         printk("NXT6000 status:");
 231
 232         val = nxt6000_readreg(state, RS_COR_STAT);
 233
 234         printk(" DATA DESCR LOCK: %d,", val & 0x01);
 235         printk(" DATA SYNC LOCK: %d,", (val >> 1) & 0x01);
 236
 237         val = nxt6000_readreg(state, VIT_SYNC_STATUS);
 238
 239         printk(" VITERBI LOCK: %d,", (val >> 7) & 0x01);
 240
 241         switch ((val >> 4) & 0x07) {
 242
 243         case 0x00:
 244                 printk(" VITERBI CODERATE: 1/2,");
 245                 break;
 246
 247         case 0x01:
 248                 printk(" VITERBI CODERATE: 2/3,");
 249                 break;
 250
 251         case 0x02:
 252                 printk(" VITERBI CODERATE: 3/4,");
 253                 break;
 254
 255         case 0x03:
 256                 printk(" VITERBI CODERATE: 5/6,");
 257                 break;
 258
 259         case 0x04:
 260                 printk(" VITERBI CODERATE: 7/8,");
 261                 break;
 262
 263         default:
 264                 printk(" VITERBI CODERATE: Reserved,");
 265
 266         }
 267
 268         val = nxt6000_readreg(state, OFDM_COR_STAT);
 269
 270         printk(" CHCTrack: %d,", (val >> 7) & 0x01);
 271         printk(" TPSLock: %d,", (val >> 6) & 0x01);
 272         printk(" SYRLock: %d,", (val >> 5) & 0x01);
 273         printk(" AGCLock: %d,", (val >> 4) & 0x01);
 274
 275         switch (val & 0x0F) {
 276
 277         case 0x00:
 278                 printk(" CoreState: IDLE,");
 279                 break;
 280
 281         case 0x02:
 282                 printk(" CoreState: WAIT_AGC,");
 283                 break;
 284
 285         case 0x03:
 286                 printk(" CoreState: WAIT_SYR,");
 287                 break;
 288
 289         case 0x04:
 290                 printk(" CoreState: WAIT_PPM,");
 291                 break;
 292
 293         case 0x01:
 294                 printk(" CoreState: WAIT_TRL,");
 295                 break;
 296
 297         case 0x05:
 298                 printk(" CoreState: WAIT_TPS,");
 299                 break;
 300
 301         case 0x06:
 302                 printk(" CoreState: MONITOR_TPS,");
 303                 break;
 304
 305         default:
 306                 printk(" CoreState: Reserved,");
 307
 308         }
 309
 310         val = nxt6000_readreg(state, OFDM_SYR_STAT);
 311
 312         printk(" SYRLock: %d,", (val >> 4) & 0x01);
 313         printk(" SYRMode: %s,", (val >> 2) & 0x01 ? "8K" : "2K");
 314
 315         switch ((val >> 4) & 0x03) {
 316
 317         case 0x00:
 318                 printk(" SYRGuard: 1/32,");
 319                 break;
 320
 321         case 0x01:
 322                 printk(" SYRGuard: 1/16,");
 323                 break;
 324
 325         case 0x02:
 326                 printk(" SYRGuard: 1/8,");
 327                 break;
 328
 329         case 0x03:
 330                 printk(" SYRGuard: 1/4,");
 331                 break;
 332         }
 333
 334         val = nxt6000_readreg(state, OFDM_TPS_RCVD_3);
 335
 336         switch ((val >> 4) & 0x07) {
 337
 338         case 0x00:
 339                 printk(" TPSLP: 1/2,");
 340                 break;
 341
 342         case 0x01:
 343                 printk(" TPSLP: 2/3,");
 344                 break;
 345
 346         case 0x02:
 347                 printk(" TPSLP: 3/4,");
 348                 break;
 349
 350         case 0x03:
 351                 printk(" TPSLP: 5/6,");
 352                 break;
 353
 354         case 0x04:
 355                 printk(" TPSLP: 7/8,");
 356                 break;
 357
 358         default:
 359                 printk(" TPSLP: Reserved,");
 360
 361         }
 362
 363         switch (val & 0x07) {
 364
 365         case 0x00:
 366                 printk(" TPSHP: 1/2,");
 367                 break;
 368
 369         case 0x01:
 370                 printk(" TPSHP: 2/3,");
 371                 break;
 372
 373         case 0x02:
 374                 printk(" TPSHP: 3/4,");
 375                 break;
 376
 377         case 0x03:
 378                 printk(" TPSHP: 5/6,");
 379                 break;
 380
 381         case 0x04:
 382                 printk(" TPSHP: 7/8,");
 383                 break;
 384
 385         default:
 386                 printk(" TPSHP: Reserved,");
 387
 388         }
 389
 390         val = nxt6000_readreg(state, OFDM_TPS_RCVD_4);
 391
 392         printk(" TPSMode: %s,", val & 0x01 ? "8K" : "2K");
 393
 394         switch ((val >> 4) & 0x03) {
 395
 396         case 0x00:
 397                 printk(" TPSGuard: 1/32,");
 398                 break;
 399
 400         case 0x01:
 401                 printk(" TPSGuard: 1/16,");
 402                 break;
 403
 404         case 0x02:
 405                 printk(" TPSGuard: 1/8,");
 406                 break;
 407
 408         case 0x03:
 409                 printk(" TPSGuard: 1/4,");
 410                 break;
 411
 412         }
 413
 414         /* Strange magic required to gain access to RF_AGC_STATUS */
 415         nxt6000_readreg(state, RF_AGC_VAL_1);
 416         val = nxt6000_readreg(state, RF_AGC_STATUS);
 417         val = nxt6000_readreg(state, RF_AGC_STATUS);
 418
 419         printk(" RF AGC LOCK: %d,", (val >> 4) & 0x01);
 420         printk("\n");
 421 }
 422
 423 static int nxt6000_read_status(struct dvb_frontend *fe, enum fe_status *status)
 424 {
 425         u8 core_status;
 426         struct nxt6000_state* state = fe->demodulator_priv;
 427
 428         *status = 0;
 429
 430         core_status = nxt6000_readreg(state, OFDM_COR_STAT);
 431
 432         if (core_status & AGCLOCKED)
 433                 *status |= FE_HAS_SIGNAL;
 434
 435         if (nxt6000_readreg(state, OFDM_SYR_STAT) & GI14_SYR_LOCK)
 436                 *status |= FE_HAS_CARRIER;
 437
 438         if (nxt6000_readreg(state, VIT_SYNC_STATUS) & VITINSYNC)
 439                 *status |= FE_HAS_VITERBI;
 440
 441         if (nxt6000_readreg(state, RS_COR_STAT) & RSCORESTATUS)
 442                 *status |= FE_HAS_SYNC;
 443
 444         if ((core_status & TPSLOCKED) && (*status == (FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)))
 445                 *status |= FE_HAS_LOCK;
 446
 447         if (debug)
 448                 nxt6000_dump_status(state);
 449
 450         return 0;
 451 }
 452
 453 static int nxt6000_init(struct dvb_frontend* fe)
 454 {
 455         struct nxt6000_state* state = fe->demodulator_priv;
 456
 457         nxt6000_reset(state);
 458         nxt6000_setup(fe);
 459
 460         return 0;
 461 }
 462
 463 static int nxt6000_set_frontend(struct dvb_frontend *fe)
 464 {
 465         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 466         struct nxt6000_state* state = fe->demodulator_priv;
 467         int result;
 468
 469         if (fe->ops.tuner_ops.set_params) {
 470                 fe->ops.tuner_ops.set_params(fe);
 471                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 472         }
 473
 474         result = nxt6000_set_bandwidth(state, p->bandwidth_hz);
 475         if (result < 0)
 476                 return result;
 477
 478         result = nxt6000_set_guard_interval(state, p->guard_interval);
 479         if (result < 0)
 480                 return result;
 481
 482         result = nxt6000_set_transmission_mode(state, p->transmission_mode);
 483         if (result < 0)
 484                 return result;
 485
 486         result = nxt6000_set_inversion(state, p->inversion);
 487         if (result < 0)
 488                 return result;
 489
 490         msleep(500);
 491         return 0;
 492 }
 493
 494 static void nxt6000_release(struct dvb_frontend* fe)
 495 {
 496         struct nxt6000_state* state = fe->demodulator_priv;
 497         kfree(state);
 498 }
 499
 500 static int nxt6000_read_snr(struct dvb_frontend* fe, u16* snr)
 501 {
 502         struct nxt6000_state* state = fe->demodulator_priv;
 503
 504         *snr = nxt6000_readreg( state, OFDM_CHC_SNR) / 8;
 505
 506         return 0;
 507 }
 508
 509 static int nxt6000_read_ber(struct dvb_frontend* fe, u32* ber)
 510 {
 511         struct nxt6000_state* state = fe->demodulator_priv;
 512
 513         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18 );
 514
 515         *ber = (nxt6000_readreg( state, VIT_BER_1 ) << 8 ) |
 516                 nxt6000_readreg( state, VIT_BER_0 );
 517
 518         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18); // Clear BER Done interrupts
 519
 520         return 0;
 521 }
 522
 523 static int nxt6000_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 524 {
 525         struct nxt6000_state* state = fe->demodulator_priv;
 526
 527         *signal_strength = (short) (511 -
 528                 (nxt6000_readreg(state, AGC_GAIN_1) +
 529                 ((nxt6000_readreg(state, AGC_GAIN_2) & 0x03) << 8)));
 530
 531         return 0;
 532 }
 533
 534 static int nxt6000_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 535 {
 536         tune->min_delay_ms = 500;
 537         return 0;
 538 }
 539
 540 static int nxt6000_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 541 {
 542         struct nxt6000_state* state = fe->demodulator_priv;
 543
 544         if (enable) {
 545                 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x01);
 546         } else {
 547                 return nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x00);
 548         }
 549 }
 550
 551 static struct dvb_frontend_ops nxt6000_ops;
 552
 553 struct dvb_frontend* nxt6000_attach(const struct nxt6000_config* config,
 554                                     struct i2c_adapter* i2c)
 555 {
 556         struct nxt6000_state* state = NULL;
 557
 558         /* allocate memory for the internal state */
 559         state = kzalloc(sizeof(struct nxt6000_state), GFP_KERNEL);
 560         if (state == NULL) goto error;
 561
 562         /* setup the state */
 563         state->config = config;
 564         state->i2c = i2c;
 565
 566         /* check if the demod is there */
 567         if (nxt6000_readreg(state, OFDM_MSC_REV) != NXT6000ASICDEVICE) goto error;
 568
 569         /* create dvb_frontend */
 570         memcpy(&state->frontend.ops, &nxt6000_ops, sizeof(struct dvb_frontend_ops));
 571         state->frontend.demodulator_priv = state;
 572         return &state->frontend;
 573
 574 error:
 575         kfree(state);
 576         return NULL;
 577 }
 578
 579 static struct dvb_frontend_ops nxt6000_ops = {
 580         .delsys = { SYS_DVBT },
 581         .info = {
 582                 .name = "NxtWave NXT6000 DVB-T",
 583                 .frequency_min = 0,
 584                 .frequency_max = 863250000,
 585                 .frequency_stepsize = 62500,
 586                 /*.frequency_tolerance = *//* FIXME: 12% of SR */
 587                 .symbol_rate_min = 0,   /* FIXME */
 588                 .symbol_rate_max = 9360000,     /* FIXME */
 589                 .symbol_rate_tolerance = 4000,
 590                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 591                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 592                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 593                         FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 594                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 595                         FE_CAN_HIERARCHY_AUTO,
 596         },
 597
 598         .release = nxt6000_release,
 599
 600         .init = nxt6000_init,
 601         .i2c_gate_ctrl = nxt6000_i2c_gate_ctrl,
 602
 603         .get_tune_settings = nxt6000_fe_get_tune_settings,
 604
 605         .set_frontend = nxt6000_set_frontend,
 606
 607         .read_status = nxt6000_read_status,
 608         .read_ber = nxt6000_read_ber,
 609         .read_signal_strength = nxt6000_read_signal_strength,
 610         .read_snr = nxt6000_read_snr,
 611 };
 612
 613 module_param(debug, int, 0644);
 614 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 615
 616 MODULE_DESCRIPTION("NxtWave NXT6000 DVB-T demodulator driver");
 617 MODULE_AUTHOR("Florian Schirmer");
 618 MODULE_LICENSE("GPL");
 619
 620 EXPORT_SYMBOL(nxt6000_attach);