1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 Driver for STV0297 demodulator 4 5 Copyright (C) 2004 Andrew de Quincey <adq_dvb@lidskialf.net> 6 Copyright (C) 2003-2004 Dennis Noermann <dennis.noermann@noernet.de> 7 8*/ 9 10#include <linux/init.h> 11#include <linux/kernel.h> 12#include <linux/module.h> 13#include <linux/string.h> 14#include <linux/delay.h> 15#include <linux/jiffies.h> 16#include <linux/slab.h> 17 18#include <media/dvb_frontend.h> 19#include "stv0297.h" 20 21struct stv0297_state { 22 struct i2c_adapter *i2c; 23 const struct stv0297_config *config; 24 struct dvb_frontend frontend; 25 26 unsigned long last_ber; 27 unsigned long base_freq; 28}; 29 30#if 1 31#define dprintk(x...) printk(x) 32#else 33#define dprintk(x...) 34#endif 35 36#define STV0297_CLOCK_KHZ 28900 37 38 39static int stv0297_writereg(struct stv0297_state *state, u8 reg, u8 data) 40{ 41 int ret; 42 u8 buf[] = { reg, data }; 43 struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 }; 44 45 ret = i2c_transfer(state->i2c, &msg, 1); 46 47 if (ret != 1) 48 dprintk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n", 49 __func__, reg, data, ret); 50 51 return (ret != 1) ? -1 : 0; 52} 53 54static int stv0297_readreg(struct stv0297_state *state, u8 reg) 55{ 56 int ret; 57 u8 b0[] = { reg }; 58 u8 b1[] = { 0 }; 59 struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 1}, 60 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1} 61 }; 62 63 // this device needs a STOP between the register and data 64 if (state->config->stop_during_read) { 65 if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) { 66 dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg, ret); 67 return -1; 68 } 69 if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) { 70 dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg, ret); 71 return -1; 72 } 73 } else { 74 if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) { 75 dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg, ret); 76 return -1; 77 } 78 } 79 80 return b1[0]; 81} 82 83static int stv0297_writereg_mask(struct stv0297_state *state, u8 reg, u8 mask, u8 data) 84{ 85 int val; 86 87 val = stv0297_readreg(state, reg); 88 val &= ~mask; 89 val |= (data & mask); 90 stv0297_writereg(state, reg, val); 91 92 return 0; 93} 94 95static int stv0297_readregs(struct stv0297_state *state, u8 reg1, u8 * b, u8 len) 96{ 97 int ret; 98 struct i2c_msg msg[] = { {.addr = state->config->demod_address,.flags = 0,.buf = 99 ®1,.len = 1}, 100 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b,.len = len} 101 }; 102 103 // this device needs a STOP between the register and data 104 if (state->config->stop_during_read) { 105 if ((ret = i2c_transfer(state->i2c, &msg[0], 1)) != 1) { 106 dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg1, ret); 107 return -1; 108 } 109 if ((ret = i2c_transfer(state->i2c, &msg[1], 1)) != 1) { 110 dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg1, ret); 111 return -1; 112 } 113 } else { 114 if ((ret = i2c_transfer(state->i2c, msg, 2)) != 2) { 115 dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n", __func__, reg1, ret); 116 return -1; 117 } 118 } 119 120 return 0; 121} 122 123static u32 stv0297_get_symbolrate(struct stv0297_state *state) 124{ 125 u64 tmp; 126 127 tmp = (u64)(stv0297_readreg(state, 0x55) 128 | (stv0297_readreg(state, 0x56) << 8) 129 | (stv0297_readreg(state, 0x57) << 16) 130 | (stv0297_readreg(state, 0x58) << 24)); 131 132 tmp *= STV0297_CLOCK_KHZ; 133 tmp >>= 32; 134 135 return (u32) tmp; 136} 137 138static void stv0297_set_symbolrate(struct stv0297_state *state, u32 srate) 139{ 140 long tmp; 141 142 tmp = 131072L * srate; /* 131072 = 2^17 */ 143 tmp = tmp / (STV0297_CLOCK_KHZ / 4); /* 1/4 = 2^-2 */ 144 tmp = tmp * 8192L; /* 8192 = 2^13 */ 145 146 stv0297_writereg(state, 0x55, (unsigned char) (tmp & 0xFF)); 147 stv0297_writereg(state, 0x56, (unsigned char) (tmp >> 8)); 148 stv0297_writereg(state, 0x57, (unsigned char) (tmp >> 16)); 149 stv0297_writereg(state, 0x58, (unsigned char) (tmp >> 24)); 150} 151 152static void stv0297_set_sweeprate(struct stv0297_state *state, short fshift, long symrate) 153{ 154 long tmp; 155 156 tmp = (long) fshift *262144L; /* 262144 = 2*18 */ 157 tmp /= symrate; 158 tmp *= 1024; /* 1024 = 2*10 */ 159 160 // adjust 161 if (tmp >= 0) { 162 tmp += 500000; 163 } else { 164 tmp -= 500000; 165 } 166 tmp /= 1000000; 167 168 stv0297_writereg(state, 0x60, tmp & 0xFF); 169 stv0297_writereg_mask(state, 0x69, 0xF0, (tmp >> 4) & 0xf0); 170} 171 172static void stv0297_set_carrieroffset(struct stv0297_state *state, long offset) 173{ 174 long tmp; 175 176 /* symrate is hardcoded to 10000 */ 177 tmp = offset * 26844L; /* (2**28)/10000 */ 178 if (tmp < 0) 179 tmp += 0x10000000; 180 tmp &= 0x0FFFFFFF; 181 182 stv0297_writereg(state, 0x66, (unsigned char) (tmp & 0xFF)); 183 stv0297_writereg(state, 0x67, (unsigned char) (tmp >> 8)); 184 stv0297_writereg(state, 0x68, (unsigned char) (tmp >> 16)); 185 stv0297_writereg_mask(state, 0x69, 0x0F, (tmp >> 24) & 0x0f); 186} 187 188/* 189static long stv0297_get_carrieroffset(struct stv0297_state *state) 190{ 191 s64 tmp; 192 193 stv0297_writereg(state, 0x6B, 0x00); 194 195 tmp = stv0297_readreg(state, 0x66); 196 tmp |= (stv0297_readreg(state, 0x67) << 8); 197 tmp |= (stv0297_readreg(state, 0x68) << 16); 198 tmp |= (stv0297_readreg(state, 0x69) & 0x0F) << 24; 199 200 tmp *= stv0297_get_symbolrate(state); 201 tmp >>= 28; 202 203 return (s32) tmp; 204} 205*/ 206 207static void stv0297_set_initialdemodfreq(struct stv0297_state *state, long freq) 208{ 209 s32 tmp; 210 211 if (freq > 10000) 212 freq -= STV0297_CLOCK_KHZ; 213 214 tmp = (STV0297_CLOCK_KHZ * 1000) / (1 << 16); 215 tmp = (freq * 1000) / tmp; 216 if (tmp > 0xffff) 217 tmp = 0xffff; 218 219 stv0297_writereg_mask(state, 0x25, 0x80, 0x80); 220 stv0297_writereg(state, 0x21, tmp >> 8); 221 stv0297_writereg(state, 0x20, tmp); 222} 223 224static int stv0297_set_qam(struct stv0297_state *state, 225 enum fe_modulation modulation) 226{ 227 int val = 0; 228 229 switch (modulation) { 230 case QAM_16: 231 val = 0; 232 break; 233 234 case QAM_32: 235 val = 1; 236 break; 237 238 case QAM_64: 239 val = 4; 240 break; 241 242 case QAM_128: 243 val = 2; 244 break; 245 246 case QAM_256: 247 val = 3; 248 break; 249 250 default: 251 return -EINVAL; 252 } 253 254 stv0297_writereg_mask(state, 0x00, 0x70, val << 4); 255 256 return 0; 257} 258 259static int stv0297_set_inversion(struct stv0297_state *state, 260 enum fe_spectral_inversion inversion) 261{ 262 int val = 0; 263 264 switch (inversion) { 265 case INVERSION_OFF: 266 val = 0; 267 break; 268 269 case INVERSION_ON: 270 val = 1; 271 break; 272 273 default: 274 return -EINVAL; 275 } 276 277 stv0297_writereg_mask(state, 0x83, 0x08, val << 3); 278 279 return 0; 280} 281 282static int stv0297_i2c_gate_ctrl(struct dvb_frontend *fe, int enable) 283{ 284 struct stv0297_state *state = fe->demodulator_priv; 285 286 if (enable) { 287 stv0297_writereg(state, 0x87, 0x78); 288 stv0297_writereg(state, 0x86, 0xc8); 289 } 290 291 return 0; 292} 293 294static int stv0297_init(struct dvb_frontend *fe) 295{ 296 struct stv0297_state *state = fe->demodulator_priv; 297 int i; 298 299 /* load init table */ 300 for (i=0; !(state->config->inittab[i] == 0xff && state->config->inittab[i+1] == 0xff); i+=2) 301 stv0297_writereg(state, state->config->inittab[i], state->config->inittab[i+1]); 302 msleep(200); 303 304 state->last_ber = 0; 305 306 return 0; 307} 308 309static int stv0297_sleep(struct dvb_frontend *fe) 310{ 311 struct stv0297_state *state = fe->demodulator_priv; 312 313 stv0297_writereg_mask(state, 0x80, 1, 1); 314 315 return 0; 316} 317 318static int stv0297_read_status(struct dvb_frontend *fe, 319 enum fe_status *status) 320{ 321 struct stv0297_state *state = fe->demodulator_priv; 322 323 u8 sync = stv0297_readreg(state, 0xDF); 324 325 *status = 0; 326 if (sync & 0x80) 327 *status |= 328 FE_HAS_SYNC | FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_LOCK; 329 return 0; 330} 331 332static int stv0297_read_ber(struct dvb_frontend *fe, u32 * ber) 333{ 334 struct stv0297_state *state = fe->demodulator_priv; 335 u8 BER[3]; 336 337 stv0297_readregs(state, 0xA0, BER, 3); 338 if (!(BER[0] & 0x80)) { 339 state->last_ber = BER[2] << 8 | BER[1]; 340 stv0297_writereg_mask(state, 0xA0, 0x80, 0x80); 341 } 342 343 *ber = state->last_ber; 344 345 return 0; 346} 347 348 349static int stv0297_read_signal_strength(struct dvb_frontend *fe, u16 * strength) 350{ 351 struct stv0297_state *state = fe->demodulator_priv; 352 u8 STRENGTH[3]; 353 u16 tmp; 354 355 stv0297_readregs(state, 0x41, STRENGTH, 3); 356 tmp = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0]; 357 if (STRENGTH[2] & 0x20) { 358 if (tmp < 0x200) 359 tmp = 0; 360 else 361 tmp = tmp - 0x200; 362 } else { 363 if (tmp > 0x1ff) 364 tmp = 0; 365 else 366 tmp = 0x1ff - tmp; 367 } 368 *strength = (tmp << 7) | (tmp >> 2); 369 return 0; 370} 371 372static int stv0297_read_snr(struct dvb_frontend *fe, u16 * snr) 373{ 374 struct stv0297_state *state = fe->demodulator_priv; 375 u8 SNR[2]; 376 377 stv0297_readregs(state, 0x07, SNR, 2); 378 *snr = SNR[1] << 8 | SNR[0]; 379 380 return 0; 381} 382 383static int stv0297_read_ucblocks(struct dvb_frontend *fe, u32 * ucblocks) 384{ 385 struct stv0297_state *state = fe->demodulator_priv; 386 387 stv0297_writereg_mask(state, 0xDF, 0x03, 0x03); /* freeze the counters */ 388 389 *ucblocks = (stv0297_readreg(state, 0xD5) << 8) 390 | stv0297_readreg(state, 0xD4); 391 392 stv0297_writereg_mask(state, 0xDF, 0x03, 0x02); /* clear the counters */ 393 stv0297_writereg_mask(state, 0xDF, 0x03, 0x01); /* re-enable the counters */ 394 395 return 0; 396} 397 398static int stv0297_set_frontend(struct dvb_frontend *fe) 399{ 400 struct dtv_frontend_properties *p = &fe->dtv_property_cache; 401 struct stv0297_state *state = fe->demodulator_priv; 402 int u_threshold; 403 int initial_u; 404 int blind_u; 405 int delay; 406 int sweeprate; 407 int carrieroffset; 408 unsigned long timeout; 409 enum fe_spectral_inversion inversion; 410 411 switch (p->modulation) { 412 case QAM_16: 413 case QAM_32: 414 case QAM_64: 415 delay = 100; 416 sweeprate = 1000; 417 break; 418 419 case QAM_128: 420 case QAM_256: 421 delay = 200; 422 sweeprate = 500; 423 break; 424 425 default: 426 return -EINVAL; 427 } 428 429 // determine inversion dependent parameters 430 inversion = p->inversion; 431 if (state->config->invert) 432 inversion = (inversion == INVERSION_ON) ? INVERSION_OFF : INVERSION_ON; 433 carrieroffset = -330; 434 switch (inversion) { 435 case INVERSION_OFF: 436 break; 437 438 case INVERSION_ON: 439 sweeprate = -sweeprate; 440 carrieroffset = -carrieroffset; 441 break; 442 443 default: 444 return -EINVAL; 445 } 446 447 stv0297_init(fe); 448 if (fe->ops.tuner_ops.set_params) { 449 fe->ops.tuner_ops.set_params(fe); 450 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); 451 } 452 453 /* clear software interrupts */ 454 stv0297_writereg(state, 0x82, 0x0); 455 456 /* set initial demodulation frequency */ 457 stv0297_set_initialdemodfreq(state, 7250); 458 459 /* setup AGC */ 460 stv0297_writereg_mask(state, 0x43, 0x10, 0x00); 461 stv0297_writereg(state, 0x41, 0x00); 462 stv0297_writereg_mask(state, 0x42, 0x03, 0x01); 463 stv0297_writereg_mask(state, 0x36, 0x60, 0x00); 464 stv0297_writereg_mask(state, 0x36, 0x18, 0x00); 465 stv0297_writereg_mask(state, 0x71, 0x80, 0x80); 466 stv0297_writereg(state, 0x72, 0x00); 467 stv0297_writereg(state, 0x73, 0x00); 468 stv0297_writereg_mask(state, 0x74, 0x0F, 0x00); 469 stv0297_writereg_mask(state, 0x43, 0x08, 0x00); 470 stv0297_writereg_mask(state, 0x71, 0x80, 0x00); 471 472 /* setup STL */ 473 stv0297_writereg_mask(state, 0x5a, 0x20, 0x20); 474 stv0297_writereg_mask(state, 0x5b, 0x02, 0x02); 475 stv0297_writereg_mask(state, 0x5b, 0x02, 0x00); 476 stv0297_writereg_mask(state, 0x5b, 0x01, 0x00); 477 stv0297_writereg_mask(state, 0x5a, 0x40, 0x40); 478 479 /* disable frequency sweep */ 480 stv0297_writereg_mask(state, 0x6a, 0x01, 0x00); 481 482 /* reset deinterleaver */ 483 stv0297_writereg_mask(state, 0x81, 0x01, 0x01); 484 stv0297_writereg_mask(state, 0x81, 0x01, 0x00); 485 486 /* ??? */ 487 stv0297_writereg_mask(state, 0x83, 0x20, 0x20); 488 stv0297_writereg_mask(state, 0x83, 0x20, 0x00); 489 490 /* reset equaliser */ 491 u_threshold = stv0297_readreg(state, 0x00) & 0xf; 492 initial_u = stv0297_readreg(state, 0x01) >> 4; 493 blind_u = stv0297_readreg(state, 0x01) & 0xf; 494 stv0297_writereg_mask(state, 0x84, 0x01, 0x01); 495 stv0297_writereg_mask(state, 0x84, 0x01, 0x00); 496 stv0297_writereg_mask(state, 0x00, 0x0f, u_threshold); 497 stv0297_writereg_mask(state, 0x01, 0xf0, initial_u << 4); 498 stv0297_writereg_mask(state, 0x01, 0x0f, blind_u); 499 500 /* data comes from internal A/D */ 501 stv0297_writereg_mask(state, 0x87, 0x80, 0x00); 502 503 /* clear phase registers */ 504 stv0297_writereg(state, 0x63, 0x00); 505 stv0297_writereg(state, 0x64, 0x00); 506 stv0297_writereg(state, 0x65, 0x00); 507 stv0297_writereg(state, 0x66, 0x00); 508 stv0297_writereg(state, 0x67, 0x00); 509 stv0297_writereg(state, 0x68, 0x00); 510 stv0297_writereg_mask(state, 0x69, 0x0f, 0x00); 511 512 /* set parameters */ 513 stv0297_set_qam(state, p->modulation); 514 stv0297_set_symbolrate(state, p->symbol_rate / 1000); 515 stv0297_set_sweeprate(state, sweeprate, p->symbol_rate / 1000); 516 stv0297_set_carrieroffset(state, carrieroffset); 517 stv0297_set_inversion(state, inversion); 518 519 /* kick off lock */ 520 /* Disable corner detection for higher QAMs */ 521 if (p->modulation == QAM_128 || 522 p->modulation == QAM_256) 523 stv0297_writereg_mask(state, 0x88, 0x08, 0x00); 524 else 525 stv0297_writereg_mask(state, 0x88, 0x08, 0x08); 526 527 stv0297_writereg_mask(state, 0x5a, 0x20, 0x00); 528 stv0297_writereg_mask(state, 0x6a, 0x01, 0x01); 529 stv0297_writereg_mask(state, 0x43, 0x40, 0x40); 530 stv0297_writereg_mask(state, 0x5b, 0x30, 0x00); 531 stv0297_writereg_mask(state, 0x03, 0x0c, 0x0c); 532 stv0297_writereg_mask(state, 0x03, 0x03, 0x03); 533 stv0297_writereg_mask(state, 0x43, 0x10, 0x10); 534 535 /* wait for WGAGC lock */ 536 timeout = jiffies + msecs_to_jiffies(2000); 537 while (time_before(jiffies, timeout)) { 538 msleep(10); 539 if (stv0297_readreg(state, 0x43) & 0x08) 540 break; 541 } 542 if (time_after(jiffies, timeout)) { 543 goto timeout; 544 } 545 msleep(20); 546 547 /* wait for equaliser partial convergence */ 548 timeout = jiffies + msecs_to_jiffies(500); 549 while (time_before(jiffies, timeout)) { 550 msleep(10); 551 552 if (stv0297_readreg(state, 0x82) & 0x04) { 553 break; 554 } 555 } 556 if (time_after(jiffies, timeout)) { 557 goto timeout; 558 } 559 560 /* wait for equaliser full convergence */ 561 timeout = jiffies + msecs_to_jiffies(delay); 562 while (time_before(jiffies, timeout)) { 563 msleep(10); 564 565 if (stv0297_readreg(state, 0x82) & 0x08) { 566 break; 567 } 568 } 569 if (time_after(jiffies, timeout)) { 570 goto timeout; 571 } 572 573 /* disable sweep */ 574 stv0297_writereg_mask(state, 0x6a, 1, 0); 575 stv0297_writereg_mask(state, 0x88, 8, 0); 576 577 /* wait for main lock */ 578 timeout = jiffies + msecs_to_jiffies(20); 579 while (time_before(jiffies, timeout)) { 580 msleep(10); 581 582 if (stv0297_readreg(state, 0xDF) & 0x80) { 583 break; 584 } 585 } 586 if (time_after(jiffies, timeout)) { 587 goto timeout; 588 } 589 msleep(100); 590 591 /* is it still locked after that delay? */ 592 if (!(stv0297_readreg(state, 0xDF) & 0x80)) { 593 goto timeout; 594 } 595 596 /* success!! */ 597 stv0297_writereg_mask(state, 0x5a, 0x40, 0x00); 598 state->base_freq = p->frequency; 599 return 0; 600 601timeout: 602 stv0297_writereg_mask(state, 0x6a, 0x01, 0x00); 603 return 0; 604} 605 606static int stv0297_get_frontend(struct dvb_frontend *fe, 607 struct dtv_frontend_properties *p) 608{ 609 struct stv0297_state *state = fe->demodulator_priv; 610 int reg_00, reg_83; 611 612 reg_00 = stv0297_readreg(state, 0x00); 613 reg_83 = stv0297_readreg(state, 0x83); 614 615 p->frequency = state->base_freq; 616 p->inversion = (reg_83 & 0x08) ? INVERSION_ON : INVERSION_OFF; 617 if (state->config->invert) 618 p->inversion = (p->inversion == INVERSION_ON) ? INVERSION_OFF : INVERSION_ON; 619 p->symbol_rate = stv0297_get_symbolrate(state) * 1000; 620 p->fec_inner = FEC_NONE; 621 622 switch ((reg_00 >> 4) & 0x7) { 623 case 0: 624 p->modulation = QAM_16; 625 break; 626 case 1: 627 p->modulation = QAM_32; 628 break; 629 case 2: 630 p->modulation = QAM_128; 631 break; 632 case 3: 633 p->modulation = QAM_256; 634 break; 635 case 4: 636 p->modulation = QAM_64; 637 break; 638 } 639 640 return 0; 641} 642 643static void stv0297_release(struct dvb_frontend *fe) 644{ 645 struct stv0297_state *state = fe->demodulator_priv; 646 kfree(state); 647} 648 649static const struct dvb_frontend_ops stv0297_ops; 650 651struct dvb_frontend *stv0297_attach(const struct stv0297_config *config, 652 struct i2c_adapter *i2c) 653{ 654 struct stv0297_state *state = NULL; 655 656 /* allocate memory for the internal state */ 657 state = kzalloc(sizeof(struct stv0297_state), GFP_KERNEL); 658 if (state == NULL) 659 goto error; 660 661 /* setup the state */ 662 state->config = config; 663 state->i2c = i2c; 664 state->last_ber = 0; 665 state->base_freq = 0; 666 667 /* check if the demod is there */ 668 if ((stv0297_readreg(state, 0x80) & 0x70) != 0x20) 669 goto error; 670 671 /* create dvb_frontend */ 672 memcpy(&state->frontend.ops, &stv0297_ops, sizeof(struct dvb_frontend_ops)); 673 state->frontend.demodulator_priv = state; 674 return &state->frontend; 675 676error: 677 kfree(state); 678 return NULL; 679} 680 681static const struct dvb_frontend_ops stv0297_ops = { 682 .delsys = { SYS_DVBC_ANNEX_A }, 683 .info = { 684 .name = "ST STV0297 DVB-C", 685 .frequency_min_hz = 47 * MHz, 686 .frequency_max_hz = 862 * MHz, 687 .frequency_stepsize_hz = 62500, 688 .symbol_rate_min = 870000, 689 .symbol_rate_max = 11700000, 690 .caps = FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 | 691 FE_CAN_QAM_128 | FE_CAN_QAM_256 | FE_CAN_FEC_AUTO}, 692 693 .release = stv0297_release, 694 695 .init = stv0297_init, 696 .sleep = stv0297_sleep, 697 .i2c_gate_ctrl = stv0297_i2c_gate_ctrl, 698 699 .set_frontend = stv0297_set_frontend, 700 .get_frontend = stv0297_get_frontend, 701 702 .read_status = stv0297_read_status, 703 .read_ber = stv0297_read_ber, 704 .read_signal_strength = stv0297_read_signal_strength, 705 .read_snr = stv0297_read_snr, 706 .read_ucblocks = stv0297_read_ucblocks, 707}; 708 709MODULE_DESCRIPTION("ST STV0297 DVB-C Demodulator driver"); 710MODULE_AUTHOR("Dennis Noermann and Andrew de Quincey"); 711MODULE_LICENSE("GPL"); 712 713EXPORT_SYMBOL_GPL(stv0297_attach); 714