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         struct dvb_frontend_ops ops;
  37         /* configuration settings */
  38         const struct nxt6000_config* config;
  39         struct dvb_frontend frontend;
  40 };
  41
  42 static int debug = 0;
  43 #define dprintk if (debug) printk
  44
  45 static int nxt6000_writereg(struct nxt6000_state* state, u8 reg, u8 data)
  46 {
  47         u8 buf[] = { reg, data };
  48         struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 };
  49         int ret;
  50
  51         if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1)
  52                 dprintk("nxt6000: nxt6000_write error (reg: 0x%02X, data: 0x%02X, ret: %d)\n", reg, data, ret);
  53
  54         return (ret != 1) ? -EFAULT : 0;
  55 }
  56
  57 static u8 nxt6000_readreg(struct nxt6000_state* state, u8 reg)
  58 {
  59         int ret;
  60         u8 b0[] = { reg };
  61         u8 b1[] = { 0 };
  62         struct i2c_msg msgs[] = {
  63                 {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1},
  64                 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
  65         };
  66
  67         ret = i2c_transfer(state->i2c, msgs, 2);
  68
  69         if (ret != 2)
  70                 dprintk("nxt6000: nxt6000_read error (reg: 0x%02X, ret: %d)\n", reg, ret);
  71
  72         return b1[0];
  73 }
  74
  75 static void nxt6000_reset(struct nxt6000_state* state)
  76 {
  77         u8 val;
  78
  79         val = nxt6000_readreg(state, OFDM_COR_CTL);
  80
  81         nxt6000_writereg(state, OFDM_COR_CTL, val & ~COREACT);
  82         nxt6000_writereg(state, OFDM_COR_CTL, val | COREACT);
  83 }
  84
  85 static int nxt6000_set_bandwidth(struct nxt6000_state* state, fe_bandwidth_t bandwidth)
  86 {
  87         u16 nominal_rate;
  88         int result;
  89
  90         switch (bandwidth) {
  91
  92         case BANDWIDTH_6_MHZ:
  93                 nominal_rate = 0x55B7;
  94                 break;
  95
  96         case BANDWIDTH_7_MHZ:
  97                 nominal_rate = 0x6400;
  98                 break;
  99
 100         case BANDWIDTH_8_MHZ:
 101                 nominal_rate = 0x7249;
 102                 break;
 103
 104         default:
 105                 return -EINVAL;
 106         }
 107
 108         if ((result = nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, nominal_rate & 0xFF)) < 0)
 109                 return result;
 110
 111         return nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, (nominal_rate >> 8) & 0xFF);
 112 }
 113
 114 static int nxt6000_set_guard_interval(struct nxt6000_state* state, fe_guard_interval_t guard_interval)
 115 {
 116         switch (guard_interval) {
 117
 118         case GUARD_INTERVAL_1_32:
 119                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x00 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 120
 121         case GUARD_INTERVAL_1_16:
 122                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x01 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 123
 124         case GUARD_INTERVAL_AUTO:
 125         case GUARD_INTERVAL_1_8:
 126                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x02 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 127
 128         case GUARD_INTERVAL_1_4:
 129                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x03 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
 130
 131         default:
 132                 return -EINVAL;
 133         }
 134 }
 135
 136 static int nxt6000_set_inversion(struct nxt6000_state* state, fe_spectral_inversion_t 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 nxt6000_set_transmission_mode(struct nxt6000_state* state, fe_transmit_mode_t transmission_mode)
 153 {
 154         int result;
 155
 156         switch (transmission_mode) {
 157
 158         case TRANSMISSION_MODE_2K:
 159                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x00 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 160                         return result;
 161
 162                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x00 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 163
 164         case TRANSMISSION_MODE_8K:
 165         case TRANSMISSION_MODE_AUTO:
 166                 if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x02 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
 167                         return result;
 168
 169                 return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x01 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
 170
 171         default:
 172                 return -EINVAL;
 173
 174         }
 175 }
 176
 177 static void nxt6000_setup(struct dvb_frontend* fe)
 178 {
 179         struct nxt6000_state* state = fe->demodulator_priv;
 180
 181         nxt6000_writereg(state, RS_COR_SYNC_PARAM, SYNC_PARAM);
 182         nxt6000_writereg(state, BER_CTRL, /*(1 << 2) | */ (0x01 << 1) | 0x01);
 183         nxt6000_writereg(state, VIT_BERTIME_2, 0x00);  // BER Timer = 0x000200 * 256 = 131072 bits
 184         nxt6000_writereg(state, VIT_BERTIME_1, 0x02);  //
 185         nxt6000_writereg(state, VIT_BERTIME_0, 0x00);  //
 186         nxt6000_writereg(state, VIT_COR_INTEN, 0x98); // Enable BER interrupts
 187         nxt6000_writereg(state, VIT_COR_CTL, 0x82);   // Enable BER measurement
 188         nxt6000_writereg(state, VIT_COR_CTL, VIT_COR_RESYNC | 0x02 );
 189         nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F));
 190         nxt6000_writereg(state, OFDM_COR_MODEGUARD, FORCEMODE8K | 0x02);
 191         nxt6000_writereg(state, OFDM_AGC_CTL, AGCLAST | INITIAL_AGC_BW);
 192         nxt6000_writereg(state, OFDM_ITB_FREQ_1, 0x06);
 193         nxt6000_writereg(state, OFDM_ITB_FREQ_2, 0x31);
 194         nxt6000_writereg(state, OFDM_CAS_CTL, (0x01 << 7) | (0x02 << 3) | 0x04);
 195         nxt6000_writereg(state, CAS_FREQ, 0xBB);        /* CHECKME */
 196         nxt6000_writereg(state, OFDM_SYR_CTL, 1 << 2);
 197         nxt6000_writereg(state, OFDM_PPM_CTL_1, PPM256);
 198         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, 0x49);
 199         nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, 0x72);
 200         nxt6000_writereg(state, ANALOG_CONTROL_0, 1 << 5);
 201         nxt6000_writereg(state, EN_DMD_RACQ, (1 << 7) | (3 << 4) | 2);
 202         nxt6000_writereg(state, DIAG_CONFIG, TB_SET);
 203
 204         if (state->config->clock_inversion)
 205                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, CLKINVERSION);
 206         else
 207                 nxt6000_writereg(state, SUB_DIAG_MODE_SEL, 0);
 208
 209         nxt6000_writereg(state, TS_FORMAT, 0);
 210
 211         if (state->config->pll_init) {
 212                 nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x01);        /* open i2c bus switch */
 213                 state->config->pll_init(fe);
 214                 nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x00);        /* close i2c bus switch */
 215         }
 216 }
 217
 218 static void nxt6000_dump_status(struct nxt6000_state *state)
 219 {
 220         u8 val;
 221
 222 /*
 223         printk("RS_COR_STAT: 0x%02X\n", nxt6000_readreg(fe, RS_COR_STAT));
 224         printk("VIT_SYNC_STATUS: 0x%02X\n", nxt6000_readreg(fe, VIT_SYNC_STATUS));
 225         printk("OFDM_COR_STAT: 0x%02X\n", nxt6000_readreg(fe, OFDM_COR_STAT));
 226         printk("OFDM_SYR_STAT: 0x%02X\n", nxt6000_readreg(fe, OFDM_SYR_STAT));
 227         printk("OFDM_TPS_RCVD_1: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_1));
 228         printk("OFDM_TPS_RCVD_2: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_2));
 229         printk("OFDM_TPS_RCVD_3: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_3));
 230         printk("OFDM_TPS_RCVD_4: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RCVD_4));
 231         printk("OFDM_TPS_RESERVED_1: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RESERVED_1));
 232         printk("OFDM_TPS_RESERVED_2: 0x%02X\n", nxt6000_readreg(fe, OFDM_TPS_RESERVED_2));
 233 */
 234         printk("NXT6000 status:");
 235
 236         val = nxt6000_readreg(state, RS_COR_STAT);
 237
 238         printk(" DATA DESCR LOCK: %d,", val & 0x01);
 239         printk(" DATA SYNC LOCK: %d,", (val >> 1) & 0x01);
 240
 241         val = nxt6000_readreg(state, VIT_SYNC_STATUS);
 242
 243         printk(" VITERBI LOCK: %d,", (val >> 7) & 0x01);
 244
 245         switch ((val >> 4) & 0x07) {
 246
 247         case 0x00:
 248                 printk(" VITERBI CODERATE: 1/2,");
 249                 break;
 250
 251         case 0x01:
 252                 printk(" VITERBI CODERATE: 2/3,");
 253                 break;
 254
 255         case 0x02:
 256                 printk(" VITERBI CODERATE: 3/4,");
 257                 break;
 258
 259         case 0x03:
 260                 printk(" VITERBI CODERATE: 5/6,");
 261                 break;
 262
 263         case 0x04:
 264                 printk(" VITERBI CODERATE: 7/8,");
 265                 break;
 266
 267         default:
 268                 printk(" VITERBI CODERATE: Reserved,");
 269
 270         }
 271
 272         val = nxt6000_readreg(state, OFDM_COR_STAT);
 273
 274         printk(" CHCTrack: %d,", (val >> 7) & 0x01);
 275         printk(" TPSLock: %d,", (val >> 6) & 0x01);
 276         printk(" SYRLock: %d,", (val >> 5) & 0x01);
 277         printk(" AGCLock: %d,", (val >> 4) & 0x01);
 278
 279         switch (val & 0x0F) {
 280
 281         case 0x00:
 282                 printk(" CoreState: IDLE,");
 283                 break;
 284
 285         case 0x02:
 286                 printk(" CoreState: WAIT_AGC,");
 287                 break;
 288
 289         case 0x03:
 290                 printk(" CoreState: WAIT_SYR,");
 291                 break;
 292
 293         case 0x04:
 294                 printk(" CoreState: WAIT_PPM,");
 295                 break;
 296
 297         case 0x01:
 298                 printk(" CoreState: WAIT_TRL,");
 299                 break;
 300
 301         case 0x05:
 302                 printk(" CoreState: WAIT_TPS,");
 303                 break;
 304
 305         case 0x06:
 306                 printk(" CoreState: MONITOR_TPS,");
 307                 break;
 308
 309         default:
 310                 printk(" CoreState: Reserved,");
 311
 312         }
 313
 314         val = nxt6000_readreg(state, OFDM_SYR_STAT);
 315
 316         printk(" SYRLock: %d,", (val >> 4) & 0x01);
 317         printk(" SYRMode: %s,", (val >> 2) & 0x01 ? "8K" : "2K");
 318
 319         switch ((val >> 4) & 0x03) {
 320
 321         case 0x00:
 322                 printk(" SYRGuard: 1/32,");
 323                 break;
 324
 325         case 0x01:
 326                 printk(" SYRGuard: 1/16,");
 327                 break;
 328
 329         case 0x02:
 330                 printk(" SYRGuard: 1/8,");
 331                 break;
 332
 333         case 0x03:
 334                 printk(" 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                 printk(" TPSLP: 1/2,");
 344                 break;
 345
 346         case 0x01:
 347                 printk(" TPSLP: 2/3,");
 348                 break;
 349
 350         case 0x02:
 351                 printk(" TPSLP: 3/4,");
 352                 break;
 353
 354         case 0x03:
 355                 printk(" TPSLP: 5/6,");
 356                 break;
 357
 358         case 0x04:
 359                 printk(" TPSLP: 7/8,");
 360                 break;
 361
 362         default:
 363                 printk(" TPSLP: Reserved,");
 364
 365         }
 366
 367         switch (val & 0x07) {
 368
 369         case 0x00:
 370                 printk(" TPSHP: 1/2,");
 371                 break;
 372
 373         case 0x01:
 374                 printk(" TPSHP: 2/3,");
 375                 break;
 376
 377         case 0x02:
 378                 printk(" TPSHP: 3/4,");
 379                 break;
 380
 381         case 0x03:
 382                 printk(" TPSHP: 5/6,");
 383                 break;
 384
 385         case 0x04:
 386                 printk(" TPSHP: 7/8,");
 387                 break;
 388
 389         default:
 390                 printk(" TPSHP: Reserved,");
 391
 392         }
 393
 394         val = nxt6000_readreg(state, OFDM_TPS_RCVD_4);
 395
 396         printk(" TPSMode: %s,", val & 0x01 ? "8K" : "2K");
 397
 398         switch ((val >> 4) & 0x03) {
 399
 400         case 0x00:
 401                 printk(" TPSGuard: 1/32,");
 402                 break;
 403
 404         case 0x01:
 405                 printk(" TPSGuard: 1/16,");
 406                 break;
 407
 408         case 0x02:
 409                 printk(" TPSGuard: 1/8,");
 410                 break;
 411
 412         case 0x03:
 413                 printk(" 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         printk(" RF AGC LOCK: %d,", (val >> 4) & 0x01);
 424         printk("\n");
 425 }
 426
 427 static int nxt6000_read_status(struct dvb_frontend* fe, fe_status_t* 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, struct dvb_frontend_parameters *param)
 468 {
 469         struct nxt6000_state* state = fe->demodulator_priv;
 470         int result;
 471
 472         nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x01);        /* open i2c bus switch */
 473         state->config->pll_set(fe, param);
 474         nxt6000_writereg(state, ENABLE_TUNER_IIC, 0x00);        /* close i2c bus switch */
 475
 476         if ((result = nxt6000_set_bandwidth(state, param->u.ofdm.bandwidth)) < 0)
 477                 return result;
 478         if ((result = nxt6000_set_guard_interval(state, param->u.ofdm.guard_interval)) < 0)
 479                 return result;
 480         if ((result = nxt6000_set_transmission_mode(state, param->u.ofdm.transmission_mode)) < 0)
 481                 return result;
 482         if ((result = nxt6000_set_inversion(state, param->inversion)) < 0)
 483                 return result;
 484
 485         return 0;
 486 }
 487
 488 static void nxt6000_release(struct dvb_frontend* fe)
 489 {
 490         struct nxt6000_state* state = fe->demodulator_priv;
 491         kfree(state);
 492 }
 493
 494 static int nxt6000_read_snr(struct dvb_frontend* fe, u16* snr)
 495 {
 496         struct nxt6000_state* state = fe->demodulator_priv;
 497
 498         *snr = nxt6000_readreg( state, OFDM_CHC_SNR) / 8;
 499
 500         return 0;
 501 }
 502
 503 static int nxt6000_read_ber(struct dvb_frontend* fe, u32* ber)
 504 {
 505         struct nxt6000_state* state = fe->demodulator_priv;
 506
 507         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18 );
 508
 509         *ber = (nxt6000_readreg( state, VIT_BER_1 ) << 8 ) |
 510                 nxt6000_readreg( state, VIT_BER_0 );
 511
 512         nxt6000_writereg( state, VIT_COR_INTSTAT, 0x18); // Clear BER Done interrupts
 513
 514         return 0;
 515 }
 516
 517 static int nxt6000_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 518 {
 519         struct nxt6000_state* state = fe->demodulator_priv;
 520
 521         *signal_strength = (short) (511 -
 522                 (nxt6000_readreg(state, AGC_GAIN_1) +
 523                 ((nxt6000_readreg(state, AGC_GAIN_2) & 0x03) << 8)));
 524
 525         return 0;
 526 }
 527
 528 static struct dvb_frontend_ops nxt6000_ops;
 529
 530 struct dvb_frontend* nxt6000_attach(const struct nxt6000_config* config,
 531                                     struct i2c_adapter* i2c)
 532 {
 533         struct nxt6000_state* state = NULL;
 534
 535         /* allocate memory for the internal state */
 536         state = kmalloc(sizeof(struct nxt6000_state), GFP_KERNEL);
 537         if (state == NULL) goto error;
 538
 539         /* setup the state */
 540         state->config = config;
 541         state->i2c = i2c;
 542         memcpy(&state->ops, &nxt6000_ops, sizeof(struct dvb_frontend_ops));
 543
 544         /* check if the demod is there */
 545         if (nxt6000_readreg(state, OFDM_MSC_REV) != NXT6000ASICDEVICE) goto error;
 546
 547         /* create dvb_frontend */
 548         state->frontend.ops = &state->ops;
 549         state->frontend.demodulator_priv = state;
 550         return &state->frontend;
 551
 552 error:
 553         kfree(state);
 554         return NULL;
 555 }
 556
 557 static struct dvb_frontend_ops nxt6000_ops = {
 558
 559         .info = {
 560                 .name = "NxtWave NXT6000 DVB-T",
 561                 .type = FE_OFDM,
 562                 .frequency_min = 0,
 563                 .frequency_max = 863250000,
 564                 .frequency_stepsize = 62500,
 565                 /*.frequency_tolerance = *//* FIXME: 12% of SR */
 566                 .symbol_rate_min = 0,   /* FIXME */
 567                 .symbol_rate_max = 9360000,     /* FIXME */
 568                 .symbol_rate_tolerance = 4000,
 569                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 570                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 571                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 572                         FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 573                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 574                         FE_CAN_HIERARCHY_AUTO,
 575         },
 576
 577         .release = nxt6000_release,
 578
 579         .init = nxt6000_init,
 580
 581         .set_frontend = nxt6000_set_frontend,
 582
 583         .read_status = nxt6000_read_status,
 584         .read_ber = nxt6000_read_ber,
 585         .read_signal_strength = nxt6000_read_signal_strength,
 586         .read_snr = nxt6000_read_snr,
 587 };
 588
 589 module_param(debug, int, 0644);
 590 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 591
 592 MODULE_DESCRIPTION("NxtWave NXT6000 DVB-T demodulator driver");
 593 MODULE_AUTHOR("Florian Schirmer");
 594 MODULE_LICENSE("GPL");
 595
 596 EXPORT_SYMBOL(nxt6000_attach);