drivers/media/dvb/frontends/au8522.c

   1 /*
   2     Auvitek AU8522 QAM/8VSB demodulator driver
   3
   4     Copyright (C) 2008 Steven Toth <stoth@hauppauge.com>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20 */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include "dvb_frontend.h"
  29 #include "dvb-pll.h"
  30 #include "au8522.h"
  31
  32 struct au8522_state {
  33
  34         struct i2c_adapter *i2c;
  35
  36         /* configuration settings */
  37         const struct au8522_config *config;
  38
  39         struct dvb_frontend frontend;
  40
  41         u32 current_frequency;
  42         fe_modulation_t current_modulation;
  43
  44 };
  45
  46 static int debug;
  47
  48 #define dprintk(arg...) do {            \
  49         if (debug)                      \
  50                  printk(arg);           \
  51         } while (0)
  52
  53 /* 16 bit registers, 8 bit values */
  54 static int au8522_writereg(struct au8522_state *state, u16 reg, u8 data)
  55 {
  56         int ret;
  57         u8 buf [] = { reg >> 8, reg & 0xff, data };
  58
  59         struct i2c_msg msg = { .addr = state->config->demod_address,
  60                                .flags = 0, .buf = buf, .len = 3 };
  61
  62         ret = i2c_transfer(state->i2c, &msg, 1);
  63
  64         if (ret != 1)
  65                 printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
  66                        "ret == %i)\n", __func__, reg, data, ret);
  67
  68         return (ret != 1) ? -1 : 0;
  69 }
  70
  71 static u8 au8522_readreg(struct au8522_state *state, u16 reg)
  72 {
  73         int ret;
  74         u8 b0 [] = { reg >> 8, reg & 0xff };
  75         u8 b1 [] = { 0 };
  76
  77         struct i2c_msg msg [] = {
  78                 { .addr = state->config->demod_address, .flags = 0,
  79                   .buf = b0, .len = 2 },
  80                 { .addr = state->config->demod_address, .flags = I2C_M_RD,
  81                   .buf = b1, .len = 1 } };
  82
  83         ret = i2c_transfer(state->i2c, msg, 2);
  84
  85         if (ret != 2)
  86                 printk(KERN_ERR "%s: readreg error (ret == %i)\n",
  87                        __func__, ret);
  88         return b1[0];
  89 }
  90
  91 static int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
  92 {
  93         struct au8522_state *state = fe->demodulator_priv;
  94
  95         dprintk("%s(%d)\n", __func__, enable);
  96
  97         if (enable)
  98                 return au8522_writereg(state, 0x106, 1);
  99         else
 100                 return au8522_writereg(state, 0x106, 0);
 101 }
 102
 103 struct mse2snr_tab {
 104         u16 val;
 105         u16 data;
 106 };
 107
 108 /* VSB SNR lookup table */
 109 static struct mse2snr_tab vsb_mse2snr_tab[] = {
 110         {   0, 270 },
 111         {   2, 250 },
 112         {   3, 240 },
 113         {   5, 230 },
 114         {   7, 220 },
 115         {   9, 210 },
 116         {  12, 200 },
 117         {  13, 195 },
 118         {  15, 190 },
 119         {  17, 185 },
 120         {  19, 180 },
 121         {  21, 175 },
 122         {  24, 170 },
 123         {  27, 165 },
 124         {  31, 160 },
 125         {  32, 158 },
 126         {  33, 156 },
 127         {  36, 152 },
 128         {  37, 150 },
 129         {  39, 148 },
 130         {  40, 146 },
 131         {  41, 144 },
 132         {  43, 142 },
 133         {  44, 140 },
 134         {  48, 135 },
 135         {  50, 130 },
 136         {  43, 142 },
 137         {  53, 125 },
 138         {  56, 120 },
 139         { 256, 115 },
 140 };
 141
 142 /* QAM64 SNR lookup table */
 143 static struct mse2snr_tab qam64_mse2snr_tab[] = {
 144         {  15,   0 },
 145         {  16, 290 },
 146         {  17, 288 },
 147         {  18, 286 },
 148         {  19, 284 },
 149         {  20, 282 },
 150         {  21, 281 },
 151         {  22, 279 },
 152         {  23, 277 },
 153         {  24, 275 },
 154         {  25, 273 },
 155         {  26, 271 },
 156         {  27, 269 },
 157         {  28, 268 },
 158         {  29, 266 },
 159         {  30, 264 },
 160         {  31, 262 },
 161         {  32, 260 },
 162         {  33, 259 },
 163         {  34, 258 },
 164         {  35, 256 },
 165         {  36, 255 },
 166         {  37, 254 },
 167         {  38, 252 },
 168         {  39, 251 },
 169         {  40, 250 },
 170         {  41, 249 },
 171         {  42, 248 },
 172         {  43, 246 },
 173         {  44, 245 },
 174         {  45, 244 },
 175         {  46, 242 },
 176         {  47, 241 },
 177         {  48, 240 },
 178         {  50, 239 },
 179         {  51, 238 },
 180         {  53, 237 },
 181         {  54, 236 },
 182         {  56, 235 },
 183         {  57, 234 },
 184         {  59, 233 },
 185         {  60, 232 },
 186         {  62, 231 },
 187         {  63, 230 },
 188         {  65, 229 },
 189         {  67, 228 },
 190         {  68, 227 },
 191         {  70, 226 },
 192         {  71, 225 },
 193         {  73, 224 },
 194         {  74, 223 },
 195         {  76, 222 },
 196         {  78, 221 },
 197         {  80, 220 },
 198         {  82, 219 },
 199         {  85, 218 },
 200         {  88, 217 },
 201         {  90, 216 },
 202         {  92, 215 },
 203         {  93, 214 },
 204         {  94, 212 },
 205         {  95, 211 },
 206         {  97, 210 },
 207         {  99, 209 },
 208         { 101, 208 },
 209         { 102, 207 },
 210         { 104, 206 },
 211         { 107, 205 },
 212         { 111, 204 },
 213         { 114, 203 },
 214         { 118, 202 },
 215         { 122, 201 },
 216         { 125, 200 },
 217         { 128, 199 },
 218         { 130, 198 },
 219         { 132, 197 },
 220         { 256, 190 },
 221 };
 222
 223 /* QAM256 SNR lookup table */
 224 static struct mse2snr_tab qam256_mse2snr_tab[] = {
 225         {  16,   0 },
 226         {  17, 400 },
 227         {  18, 398 },
 228         {  19, 396 },
 229         {  20, 394 },
 230         {  21, 392 },
 231         {  22, 390 },
 232         {  23, 388 },
 233         {  24, 386 },
 234         {  25, 384 },
 235         {  26, 382 },
 236         {  27, 380 },
 237         {  28, 379 },
 238         {  29, 378 },
 239         {  30, 377 },
 240         {  31, 376 },
 241         {  32, 375 },
 242         {  33, 374 },
 243         {  34, 373 },
 244         {  35, 372 },
 245         {  36, 371 },
 246         {  37, 370 },
 247         {  38, 362 },
 248         {  39, 354 },
 249         {  40, 346 },
 250         {  41, 338 },
 251         {  42, 330 },
 252         {  43, 328 },
 253         {  44, 326 },
 254         {  45, 324 },
 255         {  46, 322 },
 256         {  47, 320 },
 257         {  48, 319 },
 258         {  49, 318 },
 259         {  50, 317 },
 260         {  51, 316 },
 261         {  52, 315 },
 262         {  53, 314 },
 263         {  54, 313 },
 264         {  55, 312 },
 265         {  56, 311 },
 266         {  57, 310 },
 267         {  58, 308 },
 268         {  59, 306 },
 269         {  60, 304 },
 270         {  61, 302 },
 271         {  62, 300 },
 272         {  63, 298 },
 273         {  65, 295 },
 274         {  68, 294 },
 275         {  70, 293 },
 276         {  73, 292 },
 277         {  76, 291 },
 278         {  78, 290 },
 279         {  79, 289 },
 280         {  81, 288 },
 281         {  82, 287 },
 282         {  83, 286 },
 283         {  84, 285 },
 284         {  85, 284 },
 285         {  86, 283 },
 286         {  88, 282 },
 287         {  89, 281 },
 288         { 256, 280 },
 289 };
 290
 291 static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
 292                                  u16 *snr)
 293 {
 294         int i, ret = -EINVAL;
 295         dprintk("%s()\n", __func__);
 296
 297         for (i = 0; i < sz; i++) {
 298                 if (mse < tab[i].val) {
 299                         *snr = tab[i].data;
 300                         ret = 0;
 301                         break;
 302                 }
 303         }
 304         dprintk("%s() snr=%d\n", __func__, *snr);
 305         return ret;
 306 }
 307
 308 /* VSB Modulation table */
 309 static struct {
 310         u16 reg;
 311         u16 data;
 312 } VSB_mod_tab[] = {
 313         { 0x8090, 0x84 },
 314         { 0x4092, 0x11 },
 315         { 0x2005, 0x00 },
 316         { 0x8091, 0x80 },
 317         { 0x80a3, 0x0c },
 318         { 0x80a4, 0xe8 },
 319         { 0x8081, 0xc4 },
 320         { 0x80a5, 0x40 },
 321         { 0x80a7, 0x40 },
 322         { 0x80a6, 0x67 },
 323         { 0x8262, 0x20 },
 324         { 0x821c, 0x30 },
 325         { 0x80d8, 0x1a },
 326         { 0x8227, 0xa0 },
 327         { 0x8121, 0xff },
 328         { 0x80a8, 0xf0 },
 329         { 0x80a9, 0x05 },
 330         { 0x80aa, 0x77 },
 331         { 0x80ab, 0xf0 },
 332         { 0x80ac, 0x05 },
 333         { 0x80ad, 0x77 },
 334         { 0x80ae, 0x41 },
 335         { 0x80af, 0x66 },
 336         { 0x821b, 0xcc },
 337         { 0x821d, 0x80 },
 338         { 0x80b5, 0xfb },
 339         { 0x80b6, 0x8e },
 340         { 0x80b7, 0x39 },
 341         { 0x80a4, 0xe8 },
 342         { 0x8231, 0x13 },
 343 };
 344
 345 /* QAM Modulation table */
 346 static struct {
 347         u16 reg;
 348         u16 data;
 349 } QAM_mod_tab[] = {
 350         { 0x80a3, 0x09 },
 351         { 0x80a4, 0x00 },
 352         { 0x8081, 0xc4 },
 353         { 0x80a5, 0x40 },
 354         { 0x80b5, 0xfb },
 355         { 0x80b6, 0x8e },
 356         { 0x80b7, 0x39 },
 357         { 0x80aa, 0x77 },
 358         { 0x80ad, 0x77 },
 359         { 0x80a6, 0x67 },
 360         { 0x8262, 0x20 },
 361         { 0x821c, 0x30 },
 362         { 0x80b8, 0x3e },
 363         { 0x80b9, 0xf0 },
 364         { 0x80ba, 0x01 },
 365         { 0x80bb, 0x18 },
 366         { 0x80bc, 0x50 },
 367         { 0x80bd, 0x00 },
 368         { 0x80be, 0xea },
 369         { 0x80bf, 0xef },
 370         { 0x80c0, 0xfc },
 371         { 0x80c1, 0xbd },
 372         { 0x80c2, 0x1f },
 373         { 0x80c3, 0xfc },
 374         { 0x80c4, 0xdd },
 375         { 0x80c5, 0xaf },
 376         { 0x80c6, 0x00 },
 377         { 0x80c7, 0x38 },
 378         { 0x80c8, 0x30 },
 379         { 0x80c9, 0x05 },
 380         { 0x80ca, 0x4a },
 381         { 0x80cb, 0xd0 },
 382         { 0x80cc, 0x01 },
 383         { 0x80cd, 0xd9 },
 384         { 0x80ce, 0x6f },
 385         { 0x80cf, 0xf9 },
 386         { 0x80d0, 0x70 },
 387         { 0x80d1, 0xdf },
 388         { 0x80d2, 0xf7 },
 389         { 0x80d3, 0xc2 },
 390         { 0x80d4, 0xdf },
 391         { 0x80d5, 0x02 },
 392         { 0x80d6, 0x9a },
 393         { 0x80d7, 0xd0 },
 394         { 0x8250, 0x0d },
 395         { 0x8251, 0xcd },
 396         { 0x8252, 0xe0 },
 397         { 0x8253, 0x05 },
 398         { 0x8254, 0xa7 },
 399         { 0x8255, 0xff },
 400         { 0x8256, 0xed },
 401         { 0x8257, 0x5b },
 402         { 0x8258, 0xae },
 403         { 0x8259, 0xe6 },
 404         { 0x825a, 0x3d },
 405         { 0x825b, 0x0f },
 406         { 0x825c, 0x0d },
 407         { 0x825d, 0xea },
 408         { 0x825e, 0xf2 },
 409         { 0x825f, 0x51 },
 410         { 0x8260, 0xf5 },
 411         { 0x8261, 0x06 },
 412         { 0x821a, 0x00 },
 413         { 0x8546, 0x40 },
 414         { 0x8210, 0x26 },
 415         { 0x8211, 0xf6 },
 416         { 0x8212, 0x84 },
 417         { 0x8213, 0x02 },
 418         { 0x8502, 0x01 },
 419         { 0x8121, 0x04 },
 420         { 0x8122, 0x04 },
 421         { 0x852e, 0x10 },
 422         { 0x80a4, 0xca },
 423         { 0x80a7, 0x40 },
 424         { 0x8526, 0x01 },
 425 };
 426
 427 static int au8522_enable_modulation(struct dvb_frontend *fe,
 428                                     fe_modulation_t m)
 429 {
 430         struct au8522_state *state = fe->demodulator_priv;
 431         int i;
 432
 433         dprintk("%s(0x%08x)\n", __func__, m);
 434
 435         switch (m) {
 436         case VSB_8:
 437                 dprintk("%s() VSB_8\n", __func__);
 438                 for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
 439                         au8522_writereg(state,
 440                                 VSB_mod_tab[i].reg,
 441                                 VSB_mod_tab[i].data);
 442                 break;
 443         case QAM_64:
 444         case QAM_256:
 445                 dprintk("%s() QAM 64/256\n", __func__);
 446                 for (i = 0; i < ARRAY_SIZE(QAM_mod_tab); i++)
 447                         au8522_writereg(state,
 448                                 QAM_mod_tab[i].reg,
 449                                 QAM_mod_tab[i].data);
 450                 break;
 451         default:
 452                 dprintk("%s() Invalid modulation\n", __func__);
 453                 return -EINVAL;
 454         }
 455
 456         state->current_modulation = m;
 457
 458         return 0;
 459 }
 460
 461 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 462 static int au8522_set_frontend(struct dvb_frontend *fe,
 463                                struct dvb_frontend_parameters *p)
 464 {
 465         struct au8522_state *state = fe->demodulator_priv;
 466         int ret = -EINVAL;
 467
 468         dprintk("%s(frequency=%d)\n", __func__, p->frequency);
 469
 470         if ((state->current_frequency == p->frequency) &&
 471             (state->current_modulation == p->u.vsb.modulation))
 472                 return 0;
 473
 474         au8522_enable_modulation(fe, p->u.vsb.modulation);
 475
 476         /* Allow the demod to settle */
 477         msleep(100);
 478
 479         if (fe->ops.tuner_ops.set_params) {
 480                 if (fe->ops.i2c_gate_ctrl)
 481                         fe->ops.i2c_gate_ctrl(fe, 1);
 482                 ret = fe->ops.tuner_ops.set_params(fe, p);
 483                 if (fe->ops.i2c_gate_ctrl)
 484                         fe->ops.i2c_gate_ctrl(fe, 0);
 485         }
 486
 487         if (ret < 0)
 488                 return ret;
 489
 490         state->current_frequency = p->frequency;
 491
 492         return 0;
 493 }
 494
 495 /* Reset the demod hardware and reset all of the configuration registers
 496    to a default state. */
 497 static int au8522_init(struct dvb_frontend *fe)
 498 {
 499         struct au8522_state *state = fe->demodulator_priv;
 500         dprintk("%s()\n", __func__);
 501
 502         au8522_writereg(state, 0xa4, 1 << 5);
 503
 504         au8522_i2c_gate_ctrl(fe, 1);
 505
 506         return 0;
 507 }
 508
 509 static int au8522_sleep(struct dvb_frontend *fe)
 510 {
 511         struct au8522_state *state = fe->demodulator_priv;
 512         dprintk("%s()\n", __func__);
 513
 514         state->current_frequency = 0;
 515
 516         return 0;
 517 }
 518
 519 static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
 520 {
 521         struct au8522_state *state = fe->demodulator_priv;
 522         u8 reg;
 523         u32 tuner_status = 0;
 524
 525         *status = 0;
 526
 527         if (state->current_modulation == VSB_8) {
 528                 dprintk("%s() Checking VSB_8\n", __func__);
 529                 reg = au8522_readreg(state, 0x4088);
 530                 if ((reg & 0x03) == 0x03)
 531                         *status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
 532         } else {
 533                 dprintk("%s() Checking QAM\n", __func__);
 534                 reg = au8522_readreg(state, 0x4541);
 535                 if (reg & 0x80)
 536                         *status |= FE_HAS_VITERBI;
 537                 if (reg & 0x20)
 538                         *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 539         }
 540
 541         switch (state->config->status_mode) {
 542         case AU8522_DEMODLOCKING:
 543                 dprintk("%s() DEMODLOCKING\n", __func__);
 544                 if (*status & FE_HAS_VITERBI)
 545                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 546                 break;
 547         case AU8522_TUNERLOCKING:
 548                 /* Get the tuner status */
 549                 dprintk("%s() TUNERLOCKING\n", __func__);
 550                 if (fe->ops.tuner_ops.get_status) {
 551                         if (fe->ops.i2c_gate_ctrl)
 552                                 fe->ops.i2c_gate_ctrl(fe, 1);
 553
 554                         fe->ops.tuner_ops.get_status(fe, &tuner_status);
 555
 556                         if (fe->ops.i2c_gate_ctrl)
 557                                 fe->ops.i2c_gate_ctrl(fe, 0);
 558                 }
 559                 if (tuner_status)
 560                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 561                 break;
 562         }
 563
 564         dprintk("%s() status 0x%08x\n", __func__, *status);
 565
 566         return 0;
 567 }
 568
 569 static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
 570 {
 571         struct au8522_state *state = fe->demodulator_priv;
 572         int ret = -EINVAL;
 573
 574         dprintk("%s()\n", __func__);
 575
 576         if (state->current_modulation == QAM_256)
 577                 ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
 578                                             ARRAY_SIZE(qam256_mse2snr_tab),
 579                                             au8522_readreg(state, 0x4522),
 580                                             snr);
 581         else if (state->current_modulation == QAM_64)
 582                 ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
 583                                             ARRAY_SIZE(qam64_mse2snr_tab),
 584                                             au8522_readreg(state, 0x4522),
 585                                             snr);
 586         else /* VSB_8 */
 587                 ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
 588                                             ARRAY_SIZE(vsb_mse2snr_tab),
 589                                             au8522_readreg(state, 0x4311),
 590                                             snr);
 591
 592         return ret;
 593 }
 594
 595 static int au8522_read_signal_strength(struct dvb_frontend *fe,
 596                                        u16 *signal_strength)
 597 {
 598         return au8522_read_snr(fe, signal_strength);
 599 }
 600
 601 static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 602 {
 603         struct au8522_state *state = fe->demodulator_priv;
 604
 605         if (state->current_modulation == VSB_8)
 606                 *ucblocks = au8522_readreg(state, 0x4087);
 607         else
 608                 *ucblocks = au8522_readreg(state, 0x4543);
 609
 610         return 0;
 611 }
 612
 613 static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
 614 {
 615         return au8522_read_ucblocks(fe, ber);
 616 }
 617
 618 static int au8522_get_frontend(struct dvb_frontend *fe,
 619                                 struct dvb_frontend_parameters *p)
 620 {
 621         struct au8522_state *state = fe->demodulator_priv;
 622
 623         p->frequency = state->current_frequency;
 624         p->u.vsb.modulation = state->current_modulation;
 625
 626         return 0;
 627 }
 628
 629 static int au8522_get_tune_settings(struct dvb_frontend *fe,
 630                                     struct dvb_frontend_tune_settings *tune)
 631 {
 632         tune->min_delay_ms = 1000;
 633         return 0;
 634 }
 635
 636 static void au8522_release(struct dvb_frontend *fe)
 637 {
 638         struct au8522_state *state = fe->demodulator_priv;
 639         kfree(state);
 640 }
 641
 642 static struct dvb_frontend_ops au8522_ops;
 643
 644 struct dvb_frontend *au8522_attach(const struct au8522_config *config,
 645                                    struct i2c_adapter *i2c)
 646 {
 647         struct au8522_state *state = NULL;
 648
 649         /* allocate memory for the internal state */
 650         state = kmalloc(sizeof(struct au8522_state), GFP_KERNEL);
 651         if (state == NULL)
 652                 goto error;
 653
 654         /* setup the state */
 655         state->config = config;
 656         state->i2c = i2c;
 657         /* create dvb_frontend */
 658         memcpy(&state->frontend.ops, &au8522_ops,
 659                sizeof(struct dvb_frontend_ops));
 660         state->frontend.demodulator_priv = state;
 661
 662         if (au8522_init(&state->frontend) != 0) {
 663                 printk(KERN_ERR "%s: Failed to initialize correctly\n",
 664                         __func__);
 665                 goto error;
 666         }
 667
 668         /* Note: Leaving the I2C gate open here. */
 669         au8522_i2c_gate_ctrl(&state->frontend, 1);
 670
 671         return &state->frontend;
 672
 673 error:
 674         kfree(state);
 675         return NULL;
 676 }
 677 EXPORT_SYMBOL(au8522_attach);
 678
 679 static struct dvb_frontend_ops au8522_ops = {
 680
 681         .info = {
 682                 .name                   = "Auvitek AU8522 QAM/8VSB Frontend",
 683                 .type                   = FE_ATSC,
 684                 .frequency_min          = 54000000,
 685                 .frequency_max          = 858000000,
 686                 .frequency_stepsize     = 62500,
 687                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 688         },
 689
 690         .init                 = au8522_init,
 691         .sleep                = au8522_sleep,
 692         .i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 693         .set_frontend         = au8522_set_frontend,
 694         .get_frontend         = au8522_get_frontend,
 695         .get_tune_settings    = au8522_get_tune_settings,
 696         .read_status          = au8522_read_status,
 697         .read_ber             = au8522_read_ber,
 698         .read_signal_strength = au8522_read_signal_strength,
 699         .read_snr             = au8522_read_snr,
 700         .read_ucblocks        = au8522_read_ucblocks,
 701         .release              = au8522_release,
 702 };
 703
 704 module_param(debug, int, 0644);
 705 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 706
 707 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
 708 MODULE_AUTHOR("Steven Toth");
 709 MODULE_LICENSE("GPL");