drivers/media/dvb-frontends/or51132.c

   1 /*
   2  *    Support for OR51132 (pcHDTV HD-3000) - VSB/QAM
   3  *
   4  *
   5  *    Copyright (C) 2007 Trent Piepho <xyzzy@speakeasy.org>
   6  *
   7  *    Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
   8  *
   9  *    Based on code from Jack Kelliher (kelliher@xmission.com)
  10  *                           Copyright (C) 2002 & pcHDTV, inc.
  11  *
  12  *    This program is free software; you can redistribute it and/or modify
  13  *    it under the terms of the GNU General Public License as published by
  14  *    the Free Software Foundation; either version 2 of the License, or
  15  *    (at your option) any later version.
  16  *
  17  *    This program is distributed in the hope that it will be useful,
  18  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *    GNU General Public License for more details.
  21  *
  22  *    You should have received a copy of the GNU General Public License
  23  *    along with this program; if not, write to the Free Software
  24  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26 */
  27
  28 /*
  29  * This driver needs two external firmware files. Please copy
  30  * "dvb-fe-or51132-vsb.fw" and "dvb-fe-or51132-qam.fw" to
  31  * /usr/lib/hotplug/firmware/ or /lib/firmware/
  32  * (depending on configuration of firmware hotplug).
  33  */
  34 #define OR51132_VSB_FIRMWARE "dvb-fe-or51132-vsb.fw"
  35 #define OR51132_QAM_FIRMWARE "dvb-fe-or51132-qam.fw"
  36
  37 #include <linux/kernel.h>
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/delay.h>
  41 #include <linux/string.h>
  42 #include <linux/slab.h>
  43 #include <asm/byteorder.h>
  44
  45 #include "dvb_math.h"
  46 #include "dvb_frontend.h"
  47 #include "or51132.h"
  48
  49 static int debug;
  50 #define dprintk(args...) \
  51         do { \
  52                 if (debug) printk(KERN_DEBUG "or51132: " args); \
  53         } while (0)
  54
  55
  56 struct or51132_state
  57 {
  58         struct i2c_adapter* i2c;
  59
  60         /* Configuration settings */
  61         const struct or51132_config* config;
  62
  63         struct dvb_frontend frontend;
  64
  65         /* Demodulator private data */
  66         enum fe_modulation current_modulation;
  67         u32 snr; /* Result of last SNR calculation */
  68
  69         /* Tuner private data */
  70         u32 current_frequency;
  71 };
  72
  73
  74 /* Write buffer to demod */
  75 static int or51132_writebuf(struct or51132_state *state, const u8 *buf, int len)
  76 {
  77         int err;
  78         struct i2c_msg msg = { .addr = state->config->demod_address,
  79                                .flags = 0, .buf = (u8*)buf, .len = len };
  80
  81         /* msleep(20); */ /* doesn't appear to be necessary */
  82         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
  83                 printk(KERN_WARNING "or51132: I2C write (addr 0x%02x len %d) error: %d\n",
  84                        msg.addr, msg.len, err);
  85                 return -EREMOTEIO;
  86         }
  87         return 0;
  88 }
  89
  90 /* Write constant bytes, e.g. or51132_writebytes(state, 0x04, 0x42, 0x00);
  91    Less code and more efficient that loading a buffer on the stack with
  92    the bytes to send and then calling or51132_writebuf() on that. */
  93 #define or51132_writebytes(state, data...)  \
  94         ({ static const u8 _data[] = {data}; \
  95         or51132_writebuf(state, _data, sizeof(_data)); })
  96
  97 /* Read data from demod into buffer.  Returns 0 on success. */
  98 static int or51132_readbuf(struct or51132_state *state, u8 *buf, int len)
  99 {
 100         int err;
 101         struct i2c_msg msg = { .addr = state->config->demod_address,
 102                                .flags = I2C_M_RD, .buf = buf, .len = len };
 103
 104         /* msleep(20); */ /* doesn't appear to be necessary */
 105         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
 106                 printk(KERN_WARNING "or51132: I2C read (addr 0x%02x len %d) error: %d\n",
 107                        msg.addr, msg.len, err);
 108                 return -EREMOTEIO;
 109         }
 110         return 0;
 111 }
 112
 113 /* Reads a 16-bit demod register.  Returns <0 on error. */
 114 static int or51132_readreg(struct or51132_state *state, u8 reg)
 115 {
 116         u8 buf[2] = { 0x04, reg };
 117         struct i2c_msg msg[2] = {
 118                 {.addr = state->config->demod_address, .flags = 0,
 119                  .buf = buf, .len = 2 },
 120                 {.addr = state->config->demod_address, .flags = I2C_M_RD,
 121                  .buf = buf, .len = 2 }};
 122         int err;
 123
 124         if ((err = i2c_transfer(state->i2c, msg, 2)) != 2) {
 125                 printk(KERN_WARNING "or51132: I2C error reading register %d: %d\n",
 126                        reg, err);
 127                 return -EREMOTEIO;
 128         }
 129         return buf[0] | (buf[1] << 8);
 130 }
 131
 132 static int or51132_load_firmware (struct dvb_frontend* fe, const struct firmware *fw)
 133 {
 134         struct or51132_state* state = fe->demodulator_priv;
 135         static const u8 run_buf[] = {0x7F,0x01};
 136         u8 rec_buf[8];
 137         u32 firmwareAsize, firmwareBsize;
 138         int i,ret;
 139
 140         dprintk("Firmware is %Zd bytes\n",fw->size);
 141
 142         /* Get size of firmware A and B */
 143         firmwareAsize = le32_to_cpu(*((__le32*)fw->data));
 144         dprintk("FirmwareA is %i bytes\n",firmwareAsize);
 145         firmwareBsize = le32_to_cpu(*((__le32*)(fw->data+4)));
 146         dprintk("FirmwareB is %i bytes\n",firmwareBsize);
 147
 148         /* Upload firmware */
 149         if ((ret = or51132_writebuf(state, &fw->data[8], firmwareAsize))) {
 150                 printk(KERN_WARNING "or51132: load_firmware error 1\n");
 151                 return ret;
 152         }
 153         if ((ret = or51132_writebuf(state, &fw->data[8+firmwareAsize],
 154                                     firmwareBsize))) {
 155                 printk(KERN_WARNING "or51132: load_firmware error 2\n");
 156                 return ret;
 157         }
 158
 159         if ((ret = or51132_writebuf(state, run_buf, 2))) {
 160                 printk(KERN_WARNING "or51132: load_firmware error 3\n");
 161                 return ret;
 162         }
 163         if ((ret = or51132_writebuf(state, run_buf, 2))) {
 164                 printk(KERN_WARNING "or51132: load_firmware error 4\n");
 165                 return ret;
 166         }
 167
 168         /* 50ms for operation to begin */
 169         msleep(50);
 170
 171         /* Read back ucode version to besure we loaded correctly and are really up and running */
 172         /* Get uCode version */
 173         if ((ret = or51132_writebytes(state, 0x10, 0x10, 0x00))) {
 174                 printk(KERN_WARNING "or51132: load_firmware error a\n");
 175                 return ret;
 176         }
 177         if ((ret = or51132_writebytes(state, 0x04, 0x17))) {
 178                 printk(KERN_WARNING "or51132: load_firmware error b\n");
 179                 return ret;
 180         }
 181         if ((ret = or51132_writebytes(state, 0x00, 0x00))) {
 182                 printk(KERN_WARNING "or51132: load_firmware error c\n");
 183                 return ret;
 184         }
 185         for (i=0;i<4;i++) {
 186                 /* Once upon a time, this command might have had something
 187                    to do with getting the firmware version, but it's
 188                    not used anymore:
 189                    {0x04,0x00,0x30,0x00,i+1} */
 190                 /* Read 8 bytes, two bytes at a time */
 191                 if ((ret = or51132_readbuf(state, &rec_buf[i*2], 2))) {
 192                         printk(KERN_WARNING
 193                                "or51132: load_firmware error d - %d\n",i);
 194                         return ret;
 195                 }
 196         }
 197
 198         printk(KERN_WARNING
 199                "or51132: Version: %02X%02X%02X%02X-%02X%02X%02X%02X (%02X%01X-%01X-%02X%01X-%01X)\n",
 200                rec_buf[1],rec_buf[0],rec_buf[3],rec_buf[2],
 201                rec_buf[5],rec_buf[4],rec_buf[7],rec_buf[6],
 202                rec_buf[3],rec_buf[2]>>4,rec_buf[2]&0x0f,
 203                rec_buf[5],rec_buf[4]>>4,rec_buf[4]&0x0f);
 204
 205         if ((ret = or51132_writebytes(state, 0x10, 0x00, 0x00))) {
 206                 printk(KERN_WARNING "or51132: load_firmware error e\n");
 207                 return ret;
 208         }
 209         return 0;
 210 };
 211
 212 static int or51132_init(struct dvb_frontend* fe)
 213 {
 214         return 0;
 215 }
 216
 217 static int or51132_read_ber(struct dvb_frontend* fe, u32* ber)
 218 {
 219         *ber = 0;
 220         return 0;
 221 }
 222
 223 static int or51132_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 224 {
 225         *ucblocks = 0;
 226         return 0;
 227 }
 228
 229 static int or51132_sleep(struct dvb_frontend* fe)
 230 {
 231         return 0;
 232 }
 233
 234 static int or51132_setmode(struct dvb_frontend* fe)
 235 {
 236         struct or51132_state* state = fe->demodulator_priv;
 237         u8 cmd_buf1[3] = {0x04, 0x01, 0x5f};
 238         u8 cmd_buf2[3] = {0x1c, 0x00, 0 };
 239
 240         dprintk("setmode %d\n",(int)state->current_modulation);
 241
 242         switch (state->current_modulation) {
 243         case VSB_8:
 244                 /* Auto CH, Auto NTSC rej, MPEGser, MPEG2tr, phase noise-high */
 245                 cmd_buf1[2] = 0x50;
 246                 /* REC MODE inv IF spectrum, Normal */
 247                 cmd_buf2[1] = 0x03;
 248                 /* Channel MODE ATSC/VSB8 */
 249                 cmd_buf2[2] = 0x06;
 250                 break;
 251         /* All QAM modes are:
 252            Auto-deinterleave; MPEGser, MPEG2tr, phase noise-high
 253            REC MODE Normal Carrier Lock */
 254         case QAM_AUTO:
 255                 /* Channel MODE Auto QAM64/256 */
 256                 cmd_buf2[2] = 0x4f;
 257                 break;
 258         case QAM_256:
 259                 /* Channel MODE QAM256 */
 260                 cmd_buf2[2] = 0x45;
 261                 break;
 262         case QAM_64:
 263                 /* Channel MODE QAM64 */
 264                 cmd_buf2[2] = 0x43;
 265                 break;
 266         default:
 267                 printk(KERN_WARNING
 268                        "or51132: setmode: Modulation set to unsupported value (%d)\n",
 269                        state->current_modulation);
 270                 return -EINVAL;
 271         }
 272
 273         /* Set Receiver 1 register */
 274         if (or51132_writebuf(state, cmd_buf1, 3)) {
 275                 printk(KERN_WARNING "or51132: set_mode error 1\n");
 276                 return -EREMOTEIO;
 277         }
 278         dprintk("set #1 to %02x\n", cmd_buf1[2]);
 279
 280         /* Set operation mode in Receiver 6 register */
 281         if (or51132_writebuf(state, cmd_buf2, 3)) {
 282                 printk(KERN_WARNING "or51132: set_mode error 2\n");
 283                 return -EREMOTEIO;
 284         }
 285         dprintk("set #6 to 0x%02x%02x\n", cmd_buf2[1], cmd_buf2[2]);
 286
 287         return 0;
 288 }
 289
 290 /* Some modulations use the same firmware.  This classifies modulations
 291    by the firmware they use. */
 292 #define MOD_FWCLASS_UNKNOWN     0
 293 #define MOD_FWCLASS_VSB         1
 294 #define MOD_FWCLASS_QAM         2
 295 static int modulation_fw_class(enum fe_modulation modulation)
 296 {
 297         switch(modulation) {
 298         case VSB_8:
 299                 return MOD_FWCLASS_VSB;
 300         case QAM_AUTO:
 301         case QAM_64:
 302         case QAM_256:
 303                 return MOD_FWCLASS_QAM;
 304         default:
 305                 return MOD_FWCLASS_UNKNOWN;
 306         }
 307 }
 308
 309 static int or51132_set_parameters(struct dvb_frontend *fe)
 310 {
 311         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 312         int ret;
 313         struct or51132_state* state = fe->demodulator_priv;
 314         const struct firmware *fw;
 315         const char *fwname;
 316         int clock_mode;
 317
 318         /* Upload new firmware only if we need a different one */
 319         if (modulation_fw_class(state->current_modulation) !=
 320             modulation_fw_class(p->modulation)) {
 321                 switch (modulation_fw_class(p->modulation)) {
 322                 case MOD_FWCLASS_VSB:
 323                         dprintk("set_parameters VSB MODE\n");
 324                         fwname = OR51132_VSB_FIRMWARE;
 325
 326                         /* Set non-punctured clock for VSB */
 327                         clock_mode = 0;
 328                         break;
 329                 case MOD_FWCLASS_QAM:
 330                         dprintk("set_parameters QAM MODE\n");
 331                         fwname = OR51132_QAM_FIRMWARE;
 332
 333                         /* Set punctured clock for QAM */
 334                         clock_mode = 1;
 335                         break;
 336                 default:
 337                         printk("or51132: Modulation type(%d) UNSUPPORTED\n",
 338                                p->modulation);
 339                         return -1;
 340                 }
 341                 printk("or51132: Waiting for firmware upload(%s)...\n",
 342                        fwname);
 343                 ret = request_firmware(&fw, fwname, state->i2c->dev.parent);
 344                 if (ret) {
 345                         printk(KERN_WARNING "or51132: No firmware up"
 346                                "loaded(timeout or file not found?)\n");
 347                         return ret;
 348                 }
 349                 ret = or51132_load_firmware(fe, fw);
 350                 release_firmware(fw);
 351                 if (ret) {
 352                         printk(KERN_WARNING "or51132: Writing firmware to "
 353                                "device failed!\n");
 354                         return ret;
 355                 }
 356                 printk("or51132: Firmware upload complete.\n");
 357                 state->config->set_ts_params(fe, clock_mode);
 358         }
 359         /* Change only if we are actually changing the modulation */
 360         if (state->current_modulation != p->modulation) {
 361                 state->current_modulation = p->modulation;
 362                 or51132_setmode(fe);
 363         }
 364
 365         if (fe->ops.tuner_ops.set_params) {
 366                 fe->ops.tuner_ops.set_params(fe);
 367                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 368         }
 369
 370         /* Set to current mode */
 371         or51132_setmode(fe);
 372
 373         /* Update current frequency */
 374         state->current_frequency = p->frequency;
 375         return 0;
 376 }
 377
 378 static int or51132_get_parameters(struct dvb_frontend* fe,
 379                                   struct dtv_frontend_properties *p)
 380 {
 381         struct or51132_state* state = fe->demodulator_priv;
 382         int status;
 383         int retry = 1;
 384
 385 start:
 386         /* Receiver Status */
 387         if ((status = or51132_readreg(state, 0x00)) < 0) {
 388                 printk(KERN_WARNING "or51132: get_parameters: error reading receiver status\n");
 389                 return -EREMOTEIO;
 390         }
 391         switch(status&0xff) {
 392         case 0x06:
 393                 p->modulation = VSB_8;
 394                 break;
 395         case 0x43:
 396                 p->modulation = QAM_64;
 397                 break;
 398         case 0x45:
 399                 p->modulation = QAM_256;
 400                 break;
 401         default:
 402                 if (retry--)
 403                         goto start;
 404                 printk(KERN_WARNING "or51132: unknown status 0x%02x\n",
 405                        status&0xff);
 406                 return -EREMOTEIO;
 407         }
 408
 409         /* FIXME: Read frequency from frontend, take AFC into account */
 410         p->frequency = state->current_frequency;
 411
 412         /* FIXME: How to read inversion setting? Receiver 6 register? */
 413         p->inversion = INVERSION_AUTO;
 414
 415         return 0;
 416 }
 417
 418 static int or51132_read_status(struct dvb_frontend *fe, enum fe_status *status)
 419 {
 420         struct or51132_state* state = fe->demodulator_priv;
 421         int reg;
 422
 423         /* Receiver Status */
 424         if ((reg = or51132_readreg(state, 0x00)) < 0) {
 425                 printk(KERN_WARNING "or51132: read_status: error reading receiver status: %d\n", reg);
 426                 *status = 0;
 427                 return -EREMOTEIO;
 428         }
 429         dprintk("%s: read_status %04x\n", __func__, reg);
 430
 431         if (reg & 0x0100) /* Receiver Lock */
 432                 *status = FE_HAS_SIGNAL|FE_HAS_CARRIER|FE_HAS_VITERBI|
 433                           FE_HAS_SYNC|FE_HAS_LOCK;
 434         else
 435                 *status = 0;
 436         return 0;
 437 }
 438
 439 /* Calculate SNR estimation (scaled by 2^24)
 440
 441    8-VSB SNR and QAM equations from Oren datasheets
 442
 443    For 8-VSB:
 444      SNR[dB] = 10 * log10(897152044.8282 / MSE^2 ) - K
 445
 446      Where K = 0 if NTSC rejection filter is OFF; and
 447            K = 3 if NTSC rejection filter is ON
 448
 449    For QAM64:
 450      SNR[dB] = 10 * log10(897152044.8282 / MSE^2 )
 451
 452    For QAM256:
 453      SNR[dB] = 10 * log10(907832426.314266  / MSE^2 )
 454
 455    We re-write the snr equation as:
 456      SNR * 2^24 = 10*(c - 2*intlog10(MSE))
 457    Where for QAM256, c = log10(907832426.314266) * 2^24
 458    and for 8-VSB and QAM64, c = log10(897152044.8282) * 2^24 */
 459
 460 static u32 calculate_snr(u32 mse, u32 c)
 461 {
 462         if (mse == 0) /* No signal */
 463                 return 0;
 464
 465         mse = 2*intlog10(mse);
 466         if (mse > c) {
 467                 /* Negative SNR, which is possible, but realisticly the
 468                 demod will lose lock before the signal gets this bad.  The
 469                 API only allows for unsigned values, so just return 0 */
 470                 return 0;
 471         }
 472         return 10*(c - mse);
 473 }
 474
 475 static int or51132_read_snr(struct dvb_frontend* fe, u16* snr)
 476 {
 477         struct or51132_state* state = fe->demodulator_priv;
 478         int noise, reg;
 479         u32 c, usK = 0;
 480         int retry = 1;
 481
 482 start:
 483         /* SNR after Equalizer */
 484         noise = or51132_readreg(state, 0x02);
 485         if (noise < 0) {
 486                 printk(KERN_WARNING "or51132: read_snr: error reading equalizer\n");
 487                 return -EREMOTEIO;
 488         }
 489         dprintk("read_snr noise (%d)\n", noise);
 490
 491         /* Read status, contains modulation type for QAM_AUTO and
 492            NTSC filter for VSB */
 493         reg = or51132_readreg(state, 0x00);
 494         if (reg < 0) {
 495                 printk(KERN_WARNING "or51132: read_snr: error reading receiver status\n");
 496                 return -EREMOTEIO;
 497         }
 498
 499         switch (reg&0xff) {
 500         case 0x06:
 501                 if (reg & 0x1000) usK = 3 << 24;
 502                 /* Fall through to QAM64 case */
 503         case 0x43:
 504                 c = 150204167;
 505                 break;
 506         case 0x45:
 507                 c = 150290396;
 508                 break;
 509         default:
 510                 printk(KERN_WARNING "or51132: unknown status 0x%02x\n", reg&0xff);
 511                 if (retry--) goto start;
 512                 return -EREMOTEIO;
 513         }
 514         dprintk("%s: modulation %02x, NTSC rej O%s\n", __func__,
 515                 reg&0xff, reg&0x1000?"n":"ff");
 516
 517         /* Calculate SNR using noise, c, and NTSC rejection correction */
 518         state->snr = calculate_snr(noise, c) - usK;
 519         *snr = (state->snr) >> 16;
 520
 521         dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
 522                 state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
 523
 524         return 0;
 525 }
 526
 527 static int or51132_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 528 {
 529         /* Calculate Strength from SNR up to 35dB */
 530         /* Even though the SNR can go higher than 35dB, there is some comfort */
 531         /* factor in having a range of strong signals that can show at 100%   */
 532         struct or51132_state* state = (struct or51132_state*) fe->demodulator_priv;
 533         u16 snr;
 534         int ret;
 535
 536         ret = fe->ops.read_snr(fe, &snr);
 537         if (ret != 0)
 538                 return ret;
 539         /* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
 540         /* scale the range 0 - 35*2^24 into 0 - 65535 */
 541         if (state->snr >= 8960 * 0x10000)
 542                 *strength = 0xffff;
 543         else
 544                 *strength = state->snr / 8960;
 545
 546         return 0;
 547 }
 548
 549 static int or51132_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
 550 {
 551         fe_tune_settings->min_delay_ms = 500;
 552         fe_tune_settings->step_size = 0;
 553         fe_tune_settings->max_drift = 0;
 554
 555         return 0;
 556 }
 557
 558 static void or51132_release(struct dvb_frontend* fe)
 559 {
 560         struct or51132_state* state = fe->demodulator_priv;
 561         kfree(state);
 562 }
 563
 564 static struct dvb_frontend_ops or51132_ops;
 565
 566 struct dvb_frontend* or51132_attach(const struct or51132_config* config,
 567                                     struct i2c_adapter* i2c)
 568 {
 569         struct or51132_state* state = NULL;
 570
 571         /* Allocate memory for the internal state */
 572         state = kzalloc(sizeof(struct or51132_state), GFP_KERNEL);
 573         if (state == NULL)
 574                 return NULL;
 575
 576         /* Setup the state */
 577         state->config = config;
 578         state->i2c = i2c;
 579         state->current_frequency = -1;
 580         state->current_modulation = -1;
 581
 582         /* Create dvb_frontend */
 583         memcpy(&state->frontend.ops, &or51132_ops, sizeof(struct dvb_frontend_ops));
 584         state->frontend.demodulator_priv = state;
 585         return &state->frontend;
 586 }
 587
 588 static struct dvb_frontend_ops or51132_ops = {
 589         .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
 590         .info = {
 591                 .name                   = "Oren OR51132 VSB/QAM Frontend",
 592                 .frequency_min          = 44000000,
 593                 .frequency_max          = 958000000,
 594                 .frequency_stepsize     = 166666,
 595                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 596                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 597                         FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_QAM_AUTO |
 598                         FE_CAN_8VSB
 599         },
 600
 601         .release = or51132_release,
 602
 603         .init = or51132_init,
 604         .sleep = or51132_sleep,
 605
 606         .set_frontend = or51132_set_parameters,
 607         .get_frontend = or51132_get_parameters,
 608         .get_tune_settings = or51132_get_tune_settings,
 609
 610         .read_status = or51132_read_status,
 611         .read_ber = or51132_read_ber,
 612         .read_signal_strength = or51132_read_signal_strength,
 613         .read_snr = or51132_read_snr,
 614         .read_ucblocks = or51132_read_ucblocks,
 615 };
 616
 617 module_param(debug, int, 0644);
 618 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 619
 620 MODULE_DESCRIPTION("OR51132 ATSC [pcHDTV HD-3000] (8VSB & ITU J83 AnnexB FEC QAM64/256) Demodulator Driver");
 621 MODULE_AUTHOR("Kirk Lapray");
 622 MODULE_AUTHOR("Trent Piepho");
 623 MODULE_LICENSE("GPL");
 624
 625 EXPORT_SYMBOL(or51132_attach);