drivers/media/dvb-frontends/hd29l2.c

   1 /*
   2  * HDIC HD29L2 DMB-TH demodulator driver
   3  *
   4  * Copyright (C) 2011 Metropolia University of Applied Sciences, Electria R&D
   5  *
   6  * Author: Antti Palosaari <crope@iki.fi>
   7  *
   8  *    This program is free software; you can redistribute it and/or modify
   9  *    it under the terms of the GNU General Public License as published by
  10  *    the Free Software Foundation; either version 2 of the License, or
  11  *    (at your option) any later version.
  12  *
  13  *    This program is distributed in the hope that it will be useful,
  14  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *    GNU General Public License for more details.
  17  *
  18  *    You should have received a copy of the GNU General Public License
  19  *    along with this program; if not, write to the Free Software
  20  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include "hd29l2_priv.h"
  24
  25 /* write multiple registers */
  26 static int hd29l2_wr_regs(struct hd29l2_priv *priv, u8 reg, u8 *val, int len)
  27 {
  28         int ret;
  29         u8 buf[2 + len];
  30         struct i2c_msg msg[1] = {
  31                 {
  32                         .addr = priv->cfg.i2c_addr,
  33                         .flags = 0,
  34                         .len = sizeof(buf),
  35                         .buf = buf,
  36                 }
  37         };
  38
  39         buf[0] = 0x00;
  40         buf[1] = reg;
  41         memcpy(&buf[2], val, len);
  42
  43         ret = i2c_transfer(priv->i2c, msg, 1);
  44         if (ret == 1) {
  45                 ret = 0;
  46         } else {
  47                 dev_warn(&priv->i2c->dev,
  48                                 "%s: i2c wr failed=%d reg=%02x len=%d\n",
  49                                 KBUILD_MODNAME, ret, reg, len);
  50                 ret = -EREMOTEIO;
  51         }
  52
  53         return ret;
  54 }
  55
  56 /* read multiple registers */
  57 static int hd29l2_rd_regs(struct hd29l2_priv *priv, u8 reg, u8 *val, int len)
  58 {
  59         int ret;
  60         u8 buf[2] = { 0x00, reg };
  61         struct i2c_msg msg[2] = {
  62                 {
  63                         .addr = priv->cfg.i2c_addr,
  64                         .flags = 0,
  65                         .len = 2,
  66                         .buf = buf,
  67                 }, {
  68                         .addr = priv->cfg.i2c_addr,
  69                         .flags = I2C_M_RD,
  70                         .len = len,
  71                         .buf = val,
  72                 }
  73         };
  74
  75         ret = i2c_transfer(priv->i2c, msg, 2);
  76         if (ret == 2) {
  77                 ret = 0;
  78         } else {
  79                 dev_warn(&priv->i2c->dev,
  80                                 "%s: i2c rd failed=%d reg=%02x len=%d\n",
  81                                 KBUILD_MODNAME, ret, reg, len);
  82                 ret = -EREMOTEIO;
  83         }
  84
  85         return ret;
  86 }
  87
  88 /* write single register */
  89 static int hd29l2_wr_reg(struct hd29l2_priv *priv, u8 reg, u8 val)
  90 {
  91         return hd29l2_wr_regs(priv, reg, &val, 1);
  92 }
  93
  94 /* read single register */
  95 static int hd29l2_rd_reg(struct hd29l2_priv *priv, u8 reg, u8 *val)
  96 {
  97         return hd29l2_rd_regs(priv, reg, val, 1);
  98 }
  99
 100 /* write single register with mask */
 101 static int hd29l2_wr_reg_mask(struct hd29l2_priv *priv, u8 reg, u8 val, u8 mask)
 102 {
 103         int ret;
 104         u8 tmp;
 105
 106         /* no need for read if whole reg is written */
 107         if (mask != 0xff) {
 108                 ret = hd29l2_rd_regs(priv, reg, &tmp, 1);
 109                 if (ret)
 110                         return ret;
 111
 112                 val &= mask;
 113                 tmp &= ~mask;
 114                 val |= tmp;
 115         }
 116
 117         return hd29l2_wr_regs(priv, reg, &val, 1);
 118 }
 119
 120 /* read single register with mask */
 121 int hd29l2_rd_reg_mask(struct hd29l2_priv *priv, u8 reg, u8 *val, u8 mask)
 122 {
 123         int ret, i;
 124         u8 tmp;
 125
 126         ret = hd29l2_rd_regs(priv, reg, &tmp, 1);
 127         if (ret)
 128                 return ret;
 129
 130         tmp &= mask;
 131
 132         /* find position of the first bit */
 133         for (i = 0; i < 8; i++) {
 134                 if ((mask >> i) & 0x01)
 135                         break;
 136         }
 137         *val = tmp >> i;
 138
 139         return 0;
 140 }
 141
 142 static int hd29l2_soft_reset(struct hd29l2_priv *priv)
 143 {
 144         int ret;
 145         u8 tmp;
 146
 147         ret = hd29l2_rd_reg(priv, 0x26, &tmp);
 148         if (ret)
 149                 goto err;
 150
 151         ret = hd29l2_wr_reg(priv, 0x26, 0x0d);
 152         if (ret)
 153                 goto err;
 154
 155         usleep_range(10000, 20000);
 156
 157         ret = hd29l2_wr_reg(priv, 0x26, tmp);
 158         if (ret)
 159                 goto err;
 160
 161         return 0;
 162 err:
 163         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 164         return ret;
 165 }
 166
 167 static int hd29l2_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 168 {
 169         int ret, i;
 170         struct hd29l2_priv *priv = fe->demodulator_priv;
 171         u8 tmp;
 172
 173         dev_dbg(&priv->i2c->dev, "%s: enable=%d\n", __func__, enable);
 174
 175         /* set tuner address for demod */
 176         if (!priv->tuner_i2c_addr_programmed && enable) {
 177                 /* no need to set tuner address every time, once is enough */
 178                 ret = hd29l2_wr_reg(priv, 0x9d, priv->cfg.tuner_i2c_addr << 1);
 179                 if (ret)
 180                         goto err;
 181
 182                 priv->tuner_i2c_addr_programmed = true;
 183         }
 184
 185         /* open / close gate */
 186         ret = hd29l2_wr_reg(priv, 0x9f, enable);
 187         if (ret)
 188                 goto err;
 189
 190         /* wait demod ready */
 191         for (i = 10; i; i--) {
 192                 ret = hd29l2_rd_reg(priv, 0x9e, &tmp);
 193                 if (ret)
 194                         goto err;
 195
 196                 if (tmp == enable)
 197                         break;
 198
 199                 usleep_range(5000, 10000);
 200         }
 201
 202         dev_dbg(&priv->i2c->dev, "%s: loop=%d\n", __func__, i);
 203
 204         return ret;
 205 err:
 206         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 207         return ret;
 208 }
 209
 210 static int hd29l2_read_status(struct dvb_frontend *fe, fe_status_t *status)
 211 {
 212         int ret;
 213         struct hd29l2_priv *priv = fe->demodulator_priv;
 214         u8 buf[2];
 215
 216         *status = 0;
 217
 218         ret = hd29l2_rd_reg(priv, 0x05, &buf[0]);
 219         if (ret)
 220                 goto err;
 221
 222         if (buf[0] & 0x01) {
 223                 /* full lock */
 224                 *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
 225                         FE_HAS_SYNC | FE_HAS_LOCK;
 226         } else {
 227                 ret = hd29l2_rd_reg(priv, 0x0d, &buf[1]);
 228                 if (ret)
 229                         goto err;
 230
 231                 if ((buf[1] & 0xfe) == 0x78)
 232                         /* partial lock */
 233                         *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 234                                 FE_HAS_VITERBI | FE_HAS_SYNC;
 235         }
 236
 237         priv->fe_status = *status;
 238
 239         return 0;
 240 err:
 241         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 242         return ret;
 243 }
 244
 245 static int hd29l2_read_snr(struct dvb_frontend *fe, u16 *snr)
 246 {
 247         int ret;
 248         struct hd29l2_priv *priv = fe->demodulator_priv;
 249         u8 buf[2];
 250         u16 tmp;
 251
 252         if (!(priv->fe_status & FE_HAS_LOCK)) {
 253                 *snr = 0;
 254                 ret = 0;
 255                 goto err;
 256         }
 257
 258         ret = hd29l2_rd_regs(priv, 0x0b, buf, 2);
 259         if (ret)
 260                 goto err;
 261
 262         tmp = (buf[0] << 8) | buf[1];
 263
 264         /* report SNR in dB * 10 */
 265         #define LOG10_20736_24 72422627 /* log10(20736) << 24 */
 266         if (tmp)
 267                 *snr = (LOG10_20736_24 - intlog10(tmp)) / ((1 << 24) / 100);
 268         else
 269                 *snr = 0;
 270
 271         return 0;
 272 err:
 273         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 274         return ret;
 275 }
 276
 277 static int hd29l2_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 278 {
 279         int ret;
 280         struct hd29l2_priv *priv = fe->demodulator_priv;
 281         u8 buf[2];
 282         u16 tmp;
 283
 284         *strength = 0;
 285
 286         ret = hd29l2_rd_regs(priv, 0xd5, buf, 2);
 287         if (ret)
 288                 goto err;
 289
 290         tmp = buf[0] << 8 | buf[1];
 291         tmp = ~tmp & 0x0fff;
 292
 293         /* scale value to 0x0000-0xffff from 0x0000-0x0fff */
 294         *strength = tmp * 0xffff / 0x0fff;
 295
 296         return 0;
 297 err:
 298         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 299         return ret;
 300 }
 301
 302 static int hd29l2_read_ber(struct dvb_frontend *fe, u32 *ber)
 303 {
 304         int ret;
 305         struct hd29l2_priv *priv = fe->demodulator_priv;
 306         u8 buf[2];
 307
 308         if (!(priv->fe_status & FE_HAS_SYNC)) {
 309                 *ber = 0;
 310                 ret = 0;
 311                 goto err;
 312         }
 313
 314         ret = hd29l2_rd_regs(priv, 0xd9, buf, 2);
 315         if (ret) {
 316                 *ber = 0;
 317                 goto err;
 318         }
 319
 320         /* LDPC BER */
 321         *ber = ((buf[0] & 0x0f) << 8) | buf[1];
 322
 323         return 0;
 324 err:
 325         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 326         return ret;
 327 }
 328
 329 static int hd29l2_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 330 {
 331         /* no way to read? */
 332         *ucblocks = 0;
 333         return 0;
 334 }
 335
 336 static enum dvbfe_search hd29l2_search(struct dvb_frontend *fe)
 337 {
 338         int ret, i;
 339         struct hd29l2_priv *priv = fe->demodulator_priv;
 340         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 341         u8 tmp, buf[3];
 342         u8 modulation, carrier, guard_interval, interleave, code_rate;
 343         u64 num64;
 344         u32 if_freq, if_ctl;
 345         bool auto_mode;
 346
 347         dev_dbg(&priv->i2c->dev, "%s: delivery_system=%d frequency=%d " \
 348                         "bandwidth_hz=%d modulation=%d inversion=%d " \
 349                         "fec_inner=%d guard_interval=%d\n", __func__,
 350                         c->delivery_system, c->frequency, c->bandwidth_hz,
 351                         c->modulation, c->inversion, c->fec_inner,
 352                         c->guard_interval);
 353
 354         /* as for now we detect always params automatically */
 355         auto_mode = true;
 356
 357         /* program tuner */
 358         if (fe->ops.tuner_ops.set_params)
 359                 fe->ops.tuner_ops.set_params(fe);
 360
 361         /* get and program IF */
 362         if (fe->ops.tuner_ops.get_if_frequency)
 363                 fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
 364         else
 365                 if_freq = 0;
 366
 367         if (if_freq) {
 368                 /* normal IF */
 369
 370                 /* calc IF control value */
 371                 num64 = if_freq;
 372                 num64 *= 0x800000;
 373                 num64 = div_u64(num64, HD29L2_XTAL);
 374                 num64 -= 0x800000;
 375                 if_ctl = num64;
 376
 377                 tmp = 0xfc; /* tuner type normal */
 378         } else {
 379                 /* zero IF */
 380                 if_ctl = 0;
 381                 tmp = 0xfe; /* tuner type Zero-IF */
 382         }
 383
 384         buf[0] = ((if_ctl >>  0) & 0xff);
 385         buf[1] = ((if_ctl >>  8) & 0xff);
 386         buf[2] = ((if_ctl >> 16) & 0xff);
 387
 388         /* program IF control */
 389         ret = hd29l2_wr_regs(priv, 0x14, buf, 3);
 390         if (ret)
 391                 goto err;
 392
 393         /* program tuner type */
 394         ret = hd29l2_wr_reg(priv, 0xab, tmp);
 395         if (ret)
 396                 goto err;
 397
 398         dev_dbg(&priv->i2c->dev, "%s: if_freq=%d if_ctl=%x\n",
 399                         __func__, if_freq, if_ctl);
 400
 401         if (auto_mode) {
 402                 /*
 403                  * use auto mode
 404                  */
 405
 406                 /* disable quick mode */
 407                 ret = hd29l2_wr_reg_mask(priv, 0xac, 0 << 7, 0x80);
 408                 if (ret)
 409                         goto err;
 410
 411                 ret = hd29l2_wr_reg_mask(priv, 0x82, 1 << 1, 0x02);
 412                 if (ret)
 413                         goto err;
 414
 415                 /* enable auto mode */
 416                 ret = hd29l2_wr_reg_mask(priv, 0x7d, 1 << 6, 0x40);
 417                 if (ret)
 418                         goto err;
 419
 420                 ret = hd29l2_wr_reg_mask(priv, 0x81, 1 << 3, 0x08);
 421                 if (ret)
 422                         goto err;
 423
 424                 /* soft reset */
 425                 ret = hd29l2_soft_reset(priv);
 426                 if (ret)
 427                         goto err;
 428
 429                 /* detect modulation */
 430                 for (i = 30; i; i--) {
 431                         msleep(100);
 432
 433                         ret = hd29l2_rd_reg(priv, 0x0d, &tmp);
 434                         if (ret)
 435                                 goto err;
 436
 437                         if ((((tmp & 0xf0) >= 0x10) &&
 438                                 ((tmp & 0x0f) == 0x08)) || (tmp >= 0x2c))
 439                                 break;
 440                 }
 441
 442                 dev_dbg(&priv->i2c->dev, "%s: loop=%d\n", __func__, i);
 443
 444                 if (i == 0)
 445                         /* detection failed */
 446                         return DVBFE_ALGO_SEARCH_FAILED;
 447
 448                 /* read modulation */
 449                 ret = hd29l2_rd_reg_mask(priv, 0x7d, &modulation, 0x07);
 450                 if (ret)
 451                         goto err;
 452         } else {
 453                 /*
 454                  * use manual mode
 455                  */
 456
 457                 modulation = HD29L2_QAM64;
 458                 carrier = HD29L2_CARRIER_MULTI;
 459                 guard_interval = HD29L2_PN945;
 460                 interleave = HD29L2_INTERLEAVER_420;
 461                 code_rate = HD29L2_CODE_RATE_08;
 462
 463                 tmp = (code_rate << 3) | modulation;
 464                 ret = hd29l2_wr_reg_mask(priv, 0x7d, tmp, 0x5f);
 465                 if (ret)
 466                         goto err;
 467
 468                 tmp = (carrier << 2) | guard_interval;
 469                 ret = hd29l2_wr_reg_mask(priv, 0x81, tmp, 0x0f);
 470                 if (ret)
 471                         goto err;
 472
 473                 tmp = interleave;
 474                 ret = hd29l2_wr_reg_mask(priv, 0x82, tmp, 0x03);
 475                 if (ret)
 476                         goto err;
 477         }
 478
 479         /* ensure modulation validy */
 480         /* 0=QAM4_NR, 1=QAM4, 2=QAM16, 3=QAM32, 4=QAM64 */
 481         if (modulation > (ARRAY_SIZE(reg_mod_vals_tab[0].val) - 1)) {
 482                 dev_dbg(&priv->i2c->dev, "%s: modulation=%d not valid\n",
 483                                 __func__, modulation);
 484                 goto err;
 485         }
 486
 487         /* program registers according to modulation */
 488         for (i = 0; i < ARRAY_SIZE(reg_mod_vals_tab); i++) {
 489                 ret = hd29l2_wr_reg(priv, reg_mod_vals_tab[i].reg,
 490                         reg_mod_vals_tab[i].val[modulation]);
 491                 if (ret)
 492                         goto err;
 493         }
 494
 495         /* read guard interval */
 496         ret = hd29l2_rd_reg_mask(priv, 0x81, &guard_interval, 0x03);
 497         if (ret)
 498                 goto err;
 499
 500         /* read carrier mode */
 501         ret = hd29l2_rd_reg_mask(priv, 0x81, &carrier, 0x04);
 502         if (ret)
 503                 goto err;
 504
 505         dev_dbg(&priv->i2c->dev,
 506                         "%s: modulation=%d guard_interval=%d carrier=%d\n",
 507                         __func__, modulation, guard_interval, carrier);
 508
 509         if ((carrier == HD29L2_CARRIER_MULTI) && (modulation == HD29L2_QAM64) &&
 510                 (guard_interval == HD29L2_PN945)) {
 511                 dev_dbg(&priv->i2c->dev, "%s: C=3780 && QAM64 && PN945\n",
 512                                 __func__);
 513
 514                 ret = hd29l2_wr_reg(priv, 0x42, 0x33);
 515                 if (ret)
 516                         goto err;
 517
 518                 ret = hd29l2_wr_reg(priv, 0xdd, 0x01);
 519                 if (ret)
 520                         goto err;
 521         }
 522
 523         usleep_range(10000, 20000);
 524
 525         /* soft reset */
 526         ret = hd29l2_soft_reset(priv);
 527         if (ret)
 528                 goto err;
 529
 530         /* wait demod lock */
 531         for (i = 30; i; i--) {
 532                 msleep(100);
 533
 534                 /* read lock bit */
 535                 ret = hd29l2_rd_reg_mask(priv, 0x05, &tmp, 0x01);
 536                 if (ret)
 537                         goto err;
 538
 539                 if (tmp)
 540                         break;
 541         }
 542
 543         dev_dbg(&priv->i2c->dev, "%s: loop=%d\n", __func__, i);
 544
 545         if (i == 0)
 546                 return DVBFE_ALGO_SEARCH_AGAIN;
 547
 548         return DVBFE_ALGO_SEARCH_SUCCESS;
 549 err:
 550         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 551         return DVBFE_ALGO_SEARCH_ERROR;
 552 }
 553
 554 static int hd29l2_get_frontend_algo(struct dvb_frontend *fe)
 555 {
 556         return DVBFE_ALGO_CUSTOM;
 557 }
 558
 559 static int hd29l2_get_frontend(struct dvb_frontend *fe)
 560 {
 561         int ret;
 562         struct hd29l2_priv *priv = fe->demodulator_priv;
 563         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 564         u8 buf[3];
 565         u32 if_ctl;
 566         char *str_constellation, *str_code_rate, *str_constellation_code_rate,
 567                 *str_guard_interval, *str_carrier, *str_guard_interval_carrier,
 568                 *str_interleave, *str_interleave_;
 569
 570         ret = hd29l2_rd_reg(priv, 0x7d, &buf[0]);
 571         if (ret)
 572                 goto err;
 573
 574         ret = hd29l2_rd_regs(priv, 0x81, &buf[1], 2);
 575         if (ret)
 576                 goto err;
 577
 578         /* constellation, 0x7d[2:0] */
 579         switch ((buf[0] >> 0) & 0x07) {
 580         case 0: /* QAM4NR */
 581                 str_constellation = "QAM4NR";
 582                 c->modulation = QAM_AUTO; /* FIXME */
 583                 break;
 584         case 1: /* QAM4 */
 585                 str_constellation = "QAM4";
 586                 c->modulation = QPSK; /* FIXME */
 587                 break;
 588         case 2:
 589                 str_constellation = "QAM16";
 590                 c->modulation = QAM_16;
 591                 break;
 592         case 3:
 593                 str_constellation = "QAM32";
 594                 c->modulation = QAM_32;
 595                 break;
 596         case 4:
 597                 str_constellation = "QAM64";
 598                 c->modulation = QAM_64;
 599                 break;
 600         default:
 601                 str_constellation = "?";
 602         }
 603
 604         /* LDPC code rate, 0x7d[4:3] */
 605         switch ((buf[0] >> 3) & 0x03) {
 606         case 0: /* 0.4 */
 607                 str_code_rate = "0.4";
 608                 c->fec_inner = FEC_AUTO; /* FIXME */
 609                 break;
 610         case 1: /* 0.6 */
 611                 str_code_rate = "0.6";
 612                 c->fec_inner = FEC_3_5;
 613                 break;
 614         case 2: /* 0.8 */
 615                 str_code_rate = "0.8";
 616                 c->fec_inner = FEC_4_5;
 617                 break;
 618         default:
 619                 str_code_rate = "?";
 620         }
 621
 622         /* constellation & code rate set, 0x7d[6] */
 623         switch ((buf[0] >> 6) & 0x01) {
 624         case 0:
 625                 str_constellation_code_rate = "manual";
 626                 break;
 627         case 1:
 628                 str_constellation_code_rate = "auto";
 629                 break;
 630         default:
 631                 str_constellation_code_rate = "?";
 632         }
 633
 634         /* frame header, 0x81[1:0] */
 635         switch ((buf[1] >> 0) & 0x03) {
 636         case 0: /* PN945 */
 637                 str_guard_interval = "PN945";
 638                 c->guard_interval = GUARD_INTERVAL_AUTO; /* FIXME */
 639                 break;
 640         case 1: /* PN595 */
 641                 str_guard_interval = "PN595";
 642                 c->guard_interval = GUARD_INTERVAL_AUTO; /* FIXME */
 643                 break;
 644         case 2: /* PN420 */
 645                 str_guard_interval = "PN420";
 646                 c->guard_interval = GUARD_INTERVAL_AUTO; /* FIXME */
 647                 break;
 648         default:
 649                 str_guard_interval = "?";
 650         }
 651
 652         /* carrier, 0x81[2] */
 653         switch ((buf[1] >> 2) & 0x01) {
 654         case 0:
 655                 str_carrier = "C=1";
 656                 break;
 657         case 1:
 658                 str_carrier = "C=3780";
 659                 break;
 660         default:
 661                 str_carrier = "?";
 662         }
 663
 664         /* frame header & carrier set, 0x81[3] */
 665         switch ((buf[1] >> 3) & 0x01) {
 666         case 0:
 667                 str_guard_interval_carrier = "manual";
 668                 break;
 669         case 1:
 670                 str_guard_interval_carrier = "auto";
 671                 break;
 672         default:
 673                 str_guard_interval_carrier = "?";
 674         }
 675
 676         /* interleave, 0x82[0] */
 677         switch ((buf[2] >> 0) & 0x01) {
 678         case 0:
 679                 str_interleave = "M=720";
 680                 break;
 681         case 1:
 682                 str_interleave = "M=240";
 683                 break;
 684         default:
 685                 str_interleave = "?";
 686         }
 687
 688         /* interleave set, 0x82[1] */
 689         switch ((buf[2] >> 1) & 0x01) {
 690         case 0:
 691                 str_interleave_ = "manual";
 692                 break;
 693         case 1:
 694                 str_interleave_ = "auto";
 695                 break;
 696         default:
 697                 str_interleave_ = "?";
 698         }
 699
 700         /*
 701          * We can read out current detected NCO and use that value next
 702          * time instead of calculating new value from targed IF.
 703          * I think it will not effect receiver sensitivity but gaining lock
 704          * after tune could be easier...
 705          */
 706         ret = hd29l2_rd_regs(priv, 0xb1, &buf[0], 3);
 707         if (ret)
 708                 goto err;
 709
 710         if_ctl = (buf[0] << 16) | ((buf[1] - 7) << 8) | buf[2];
 711
 712         dev_dbg(&priv->i2c->dev, "%s: %s %s %s | %s %s %s | %s %s | NCO=%06x\n",
 713                         __func__, str_constellation, str_code_rate,
 714                         str_constellation_code_rate, str_guard_interval,
 715                         str_carrier, str_guard_interval_carrier, str_interleave,
 716                         str_interleave_, if_ctl);
 717         return 0;
 718 err:
 719         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 720         return ret;
 721 }
 722
 723 static int hd29l2_init(struct dvb_frontend *fe)
 724 {
 725         int ret, i;
 726         struct hd29l2_priv *priv = fe->demodulator_priv;
 727         u8 tmp;
 728         static const struct reg_val tab[] = {
 729                 { 0x3a, 0x06 },
 730                 { 0x3b, 0x03 },
 731                 { 0x3c, 0x04 },
 732                 { 0xaf, 0x06 },
 733                 { 0xb0, 0x1b },
 734                 { 0x80, 0x64 },
 735                 { 0x10, 0x38 },
 736         };
 737
 738         dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
 739
 740         /* reset demod */
 741         /* it is recommended to HW reset chip using RST_N pin */
 742         if (fe->callback) {
 743                 ret = fe->callback(fe, DVB_FRONTEND_COMPONENT_DEMOD, 0, 0);
 744                 if (ret)
 745                         goto err;
 746
 747                 /* reprogramming needed because HW reset clears registers */
 748                 priv->tuner_i2c_addr_programmed = false;
 749         }
 750
 751         /* init */
 752         for (i = 0; i < ARRAY_SIZE(tab); i++) {
 753                 ret = hd29l2_wr_reg(priv, tab[i].reg, tab[i].val);
 754                 if (ret)
 755                         goto err;
 756         }
 757
 758         /* TS params */
 759         ret = hd29l2_rd_reg(priv, 0x36, &tmp);
 760         if (ret)
 761                 goto err;
 762
 763         tmp &= 0x1b;
 764         tmp |= priv->cfg.ts_mode;
 765         ret = hd29l2_wr_reg(priv, 0x36, tmp);
 766         if (ret)
 767                 goto err;
 768
 769         ret = hd29l2_rd_reg(priv, 0x31, &tmp);
 770         tmp &= 0xef;
 771
 772         if (!(priv->cfg.ts_mode >> 7))
 773                 /* set b4 for serial TS */
 774                 tmp |= 0x10;
 775
 776         ret = hd29l2_wr_reg(priv, 0x31, tmp);
 777         if (ret)
 778                 goto err;
 779
 780         return ret;
 781 err:
 782         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
 783         return ret;
 784 }
 785
 786 static void hd29l2_release(struct dvb_frontend *fe)
 787 {
 788         struct hd29l2_priv *priv = fe->demodulator_priv;
 789         kfree(priv);
 790 }
 791
 792 static struct dvb_frontend_ops hd29l2_ops;
 793
 794 struct dvb_frontend *hd29l2_attach(const struct hd29l2_config *config,
 795         struct i2c_adapter *i2c)
 796 {
 797         int ret;
 798         struct hd29l2_priv *priv = NULL;
 799         u8 tmp;
 800
 801         /* allocate memory for the internal state */
 802         priv = kzalloc(sizeof(struct hd29l2_priv), GFP_KERNEL);
 803         if (priv == NULL)
 804                 goto err;
 805
 806         /* setup the state */
 807         priv->i2c = i2c;
 808         memcpy(&priv->cfg, config, sizeof(struct hd29l2_config));
 809
 810
 811         /* check if the demod is there */
 812         ret = hd29l2_rd_reg(priv, 0x00, &tmp);
 813         if (ret)
 814                 goto err;
 815
 816         /* create dvb_frontend */
 817         memcpy(&priv->fe.ops, &hd29l2_ops, sizeof(struct dvb_frontend_ops));
 818         priv->fe.demodulator_priv = priv;
 819
 820         return &priv->fe;
 821 err:
 822         kfree(priv);
 823         return NULL;
 824 }
 825 EXPORT_SYMBOL(hd29l2_attach);
 826
 827 static struct dvb_frontend_ops hd29l2_ops = {
 828         .delsys = { SYS_DVBT },
 829         .info = {
 830                 .name = "HDIC HD29L2 DMB-TH",
 831                 .frequency_min = 474000000,
 832                 .frequency_max = 858000000,
 833                 .frequency_stepsize = 10000,
 834                 .caps = FE_CAN_FEC_AUTO |
 835                         FE_CAN_QPSK |
 836                         FE_CAN_QAM_16 |
 837                         FE_CAN_QAM_32 |
 838                         FE_CAN_QAM_64 |
 839                         FE_CAN_QAM_AUTO |
 840                         FE_CAN_TRANSMISSION_MODE_AUTO |
 841                         FE_CAN_BANDWIDTH_AUTO |
 842                         FE_CAN_GUARD_INTERVAL_AUTO |
 843                         FE_CAN_HIERARCHY_AUTO |
 844                         FE_CAN_RECOVER
 845         },
 846
 847         .release = hd29l2_release,
 848
 849         .init = hd29l2_init,
 850
 851         .get_frontend_algo = hd29l2_get_frontend_algo,
 852         .search = hd29l2_search,
 853         .get_frontend = hd29l2_get_frontend,
 854
 855         .read_status = hd29l2_read_status,
 856         .read_snr = hd29l2_read_snr,
 857         .read_signal_strength = hd29l2_read_signal_strength,
 858         .read_ber = hd29l2_read_ber,
 859         .read_ucblocks = hd29l2_read_ucblocks,
 860
 861         .i2c_gate_ctrl = hd29l2_i2c_gate_ctrl,
 862 };
 863
 864 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 865 MODULE_DESCRIPTION("HDIC HD29L2 DMB-TH demodulator driver");
 866 MODULE_LICENSE("GPL");