drivers/media/dvb/frontends/lgdt330x.c

   1 /*
   2  *    Support for LGDT3302 and LGDT3303 - VSB/QAM
   3  *
   4  *    Copyright (C) 2005 Wilson Michaels <wilsonmichaels@earthlink.net>
   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 /*
  23  *                      NOTES ABOUT THIS DRIVER
  24  *
  25  * This Linux driver supports:
  26  *   DViCO FusionHDTV 3 Gold-Q
  27  *   DViCO FusionHDTV 3 Gold-T
  28  *   DViCO FusionHDTV 5 Gold
  29  *   DViCO FusionHDTV 5 Lite
  30  *   DViCO FusionHDTV 5 USB Gold
  31  *   Air2PC/AirStar 2 ATSC 3rd generation (HD5000)
  32  *   pcHDTV HD5500
  33  *
  34  * TODO:
  35  * signal strength always returns 0.
  36  *
  37  */
  38
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/moduleparam.h>
  42 #include <linux/init.h>
  43 #include <linux/delay.h>
  44 #include <linux/string.h>
  45 #include <linux/slab.h>
  46 #include <asm/byteorder.h>
  47
  48 #include "dvb_frontend.h"
  49 #include "lgdt330x_priv.h"
  50 #include "lgdt330x.h"
  51
  52 static int debug = 0;
  53 module_param(debug, int, 0644);
  54 MODULE_PARM_DESC(debug,"Turn on/off lgdt330x frontend debugging (default:off).");
  55 #define dprintk(args...) \
  56 do { \
  57 if (debug) printk(KERN_DEBUG "lgdt330x: " args); \
  58 } while (0)
  59
  60 struct lgdt330x_state
  61 {
  62         struct i2c_adapter* i2c;
  63
  64         /* Configuration settings */
  65         const struct lgdt330x_config* config;
  66
  67         struct dvb_frontend frontend;
  68
  69         /* Demodulator private data */
  70         fe_modulation_t current_modulation;
  71
  72         /* Tuner private data */
  73         u32 current_frequency;
  74 };
  75
  76 static int i2c_write_demod_bytes (struct lgdt330x_state* state,
  77                                   u8 *buf, /* data bytes to send */
  78                                   int len  /* number of bytes to send */ )
  79 {
  80         struct i2c_msg msg =
  81                 { .addr = state->config->demod_address,
  82                   .flags = 0,
  83                   .buf = buf,
  84                   .len = 2 };
  85         int i;
  86         int err;
  87
  88         for (i=0; i<len-1; i+=2){
  89                 if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
  90                         printk(KERN_WARNING "lgdt330x: %s error (addr %02x <- %02x, err = %i)\n", __FUNCTION__, msg.buf[0], msg.buf[1], err);
  91                         if (err < 0)
  92                                 return err;
  93                         else
  94                                 return -EREMOTEIO;
  95                 }
  96                 msg.buf += 2;
  97         }
  98         return 0;
  99 }
 100
 101 /*
 102  * This routine writes the register (reg) to the demod bus
 103  * then reads the data returned for (len) bytes.
 104  */
 105
 106 static u8 i2c_read_demod_bytes (struct lgdt330x_state* state,
 107                                enum I2C_REG reg, u8* buf, int len)
 108 {
 109         u8 wr [] = { reg };
 110         struct i2c_msg msg [] = {
 111                 { .addr = state->config->demod_address,
 112                   .flags = 0, .buf = wr,  .len = 1 },
 113                 { .addr = state->config->demod_address,
 114                   .flags = I2C_M_RD, .buf = buf, .len = len },
 115         };
 116         int ret;
 117         ret = i2c_transfer(state->i2c, msg, 2);
 118         if (ret != 2) {
 119                 printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __FUNCTION__, state->config->demod_address, reg, ret);
 120         } else {
 121                 ret = 0;
 122         }
 123         return ret;
 124 }
 125
 126 /* Software reset */
 127 static int lgdt3302_SwReset(struct lgdt330x_state* state)
 128 {
 129         u8 ret;
 130         u8 reset[] = {
 131                 IRQ_MASK,
 132                 0x00 /* bit 6 is active low software reset
 133                       * bits 5-0 are 1 to mask interrupts */
 134         };
 135
 136         ret = i2c_write_demod_bytes(state,
 137                                     reset, sizeof(reset));
 138         if (ret == 0) {
 139
 140                 /* force reset high (inactive) and unmask interrupts */
 141                 reset[1] = 0x7f;
 142                 ret = i2c_write_demod_bytes(state,
 143                                             reset, sizeof(reset));
 144         }
 145         return ret;
 146 }
 147
 148 static int lgdt3303_SwReset(struct lgdt330x_state* state)
 149 {
 150         u8 ret;
 151         u8 reset[] = {
 152                 0x02,
 153                 0x00 /* bit 0 is active low software reset */
 154         };
 155
 156         ret = i2c_write_demod_bytes(state,
 157                                     reset, sizeof(reset));
 158         if (ret == 0) {
 159
 160                 /* force reset high (inactive) */
 161                 reset[1] = 0x01;
 162                 ret = i2c_write_demod_bytes(state,
 163                                             reset, sizeof(reset));
 164         }
 165         return ret;
 166 }
 167
 168 static int lgdt330x_SwReset(struct lgdt330x_state* state)
 169 {
 170         switch (state->config->demod_chip) {
 171         case LGDT3302:
 172                 return lgdt3302_SwReset(state);
 173         case LGDT3303:
 174                 return lgdt3303_SwReset(state);
 175         default:
 176                 return -ENODEV;
 177         }
 178 }
 179
 180 static int lgdt330x_init(struct dvb_frontend* fe)
 181 {
 182         /* Hardware reset is done using gpio[0] of cx23880x chip.
 183          * I'd like to do it here, but don't know how to find chip address.
 184          * cx88-cards.c arranges for the reset bit to be inactive (high).
 185          * Maybe there needs to be a callable function in cx88-core or
 186          * the caller of this function needs to do it. */
 187
 188         /*
 189          * Array of byte pairs <address, value>
 190          * to initialize each different chip
 191          */
 192         static u8 lgdt3302_init_data[] = {
 193                 /* Use 50MHz parameter values from spec sheet since xtal is 50 */
 194                 /* Change the value of NCOCTFV[25:0] of carrier
 195                    recovery center frequency register */
 196                 VSB_CARRIER_FREQ0, 0x00,
 197                 VSB_CARRIER_FREQ1, 0x87,
 198                 VSB_CARRIER_FREQ2, 0x8e,
 199                 VSB_CARRIER_FREQ3, 0x01,
 200                 /* Change the TPCLK pin polarity
 201                    data is valid on falling clock */
 202                 DEMUX_CONTROL, 0xfb,
 203                 /* Change the value of IFBW[11:0] of
 204                    AGC IF/RF loop filter bandwidth register */
 205                 AGC_RF_BANDWIDTH0, 0x40,
 206                 AGC_RF_BANDWIDTH1, 0x93,
 207                 AGC_RF_BANDWIDTH2, 0x00,
 208                 /* Change the value of bit 6, 'nINAGCBY' and
 209                    'NSSEL[1:0] of ACG function control register 2 */
 210                 AGC_FUNC_CTRL2, 0xc6,
 211                 /* Change the value of bit 6 'RFFIX'
 212                    of AGC function control register 3 */
 213                 AGC_FUNC_CTRL3, 0x40,
 214                 /* Set the value of 'INLVTHD' register 0x2a/0x2c
 215                    to 0x7fe */
 216                 AGC_DELAY0, 0x07,
 217                 AGC_DELAY2, 0xfe,
 218                 /* Change the value of IAGCBW[15:8]
 219                    of inner AGC loop filter bandwidth */
 220                 AGC_LOOP_BANDWIDTH0, 0x08,
 221                 AGC_LOOP_BANDWIDTH1, 0x9a
 222         };
 223
 224         static u8 lgdt3303_init_data[] = {
 225                 0x4c, 0x14
 226         };
 227
 228         static u8 flip_lgdt3303_init_data[] = {
 229                 0x4c, 0x14,
 230                 0x87, 0xf3
 231         };
 232
 233         struct lgdt330x_state* state = fe->demodulator_priv;
 234         char  *chip_name;
 235         int    err;
 236
 237         switch (state->config->demod_chip) {
 238         case LGDT3302:
 239                 chip_name = "LGDT3302";
 240                 err = i2c_write_demod_bytes(state, lgdt3302_init_data,
 241                                             sizeof(lgdt3302_init_data));
 242                 break;
 243         case LGDT3303:
 244                 chip_name = "LGDT3303";
 245                 if (state->config->clock_polarity_flip) {
 246                         err = i2c_write_demod_bytes(state, flip_lgdt3303_init_data,
 247                                                     sizeof(flip_lgdt3303_init_data));
 248                 } else {
 249                         err = i2c_write_demod_bytes(state, lgdt3303_init_data,
 250                                                     sizeof(lgdt3303_init_data));
 251                 }
 252                 break;
 253         default:
 254                 chip_name = "undefined";
 255                 printk (KERN_WARNING "Only LGDT3302 and LGDT3303 are supported chips.\n");
 256                 err = -ENODEV;
 257         }
 258         dprintk("%s entered as %s\n", __FUNCTION__, chip_name);
 259         if (err < 0)
 260                 return err;
 261         return lgdt330x_SwReset(state);
 262 }
 263
 264 static int lgdt330x_read_ber(struct dvb_frontend* fe, u32* ber)
 265 {
 266         *ber = 0; /* Not supplied by the demod chips */
 267         return 0;
 268 }
 269
 270 static int lgdt330x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 271 {
 272         struct lgdt330x_state* state = fe->demodulator_priv;
 273         int err;
 274         u8 buf[2];
 275
 276         switch (state->config->demod_chip) {
 277         case LGDT3302:
 278                 err = i2c_read_demod_bytes(state, LGDT3302_PACKET_ERR_COUNTER1,
 279                                            buf, sizeof(buf));
 280                 break;
 281         case LGDT3303:
 282                 err = i2c_read_demod_bytes(state, LGDT3303_PACKET_ERR_COUNTER1,
 283                                            buf, sizeof(buf));
 284                 break;
 285         default:
 286                 printk(KERN_WARNING
 287                        "Only LGDT3302 and LGDT3303 are supported chips.\n");
 288                 err = -ENODEV;
 289         }
 290
 291         *ucblocks = (buf[0] << 8) | buf[1];
 292         return 0;
 293 }
 294
 295 static int lgdt330x_set_parameters(struct dvb_frontend* fe,
 296                                    struct dvb_frontend_parameters *param)
 297 {
 298         /*
 299          * Array of byte pairs <address, value>
 300          * to initialize 8VSB for lgdt3303 chip 50 MHz IF
 301          */
 302         static u8 lgdt3303_8vsb_44_data[] = {
 303                 0x04, 0x00,
 304                 0x0d, 0x40,
 305         0x0e, 0x87,
 306         0x0f, 0x8e,
 307         0x10, 0x01,
 308         0x47, 0x8b };
 309
 310         /*
 311          * Array of byte pairs <address, value>
 312          * to initialize QAM for lgdt3303 chip
 313          */
 314         static u8 lgdt3303_qam_data[] = {
 315                 0x04, 0x00,
 316                 0x0d, 0x00,
 317                 0x0e, 0x00,
 318                 0x0f, 0x00,
 319                 0x10, 0x00,
 320                 0x51, 0x63,
 321                 0x47, 0x66,
 322                 0x48, 0x66,
 323                 0x4d, 0x1a,
 324                 0x49, 0x08,
 325                 0x4a, 0x9b };
 326
 327         struct lgdt330x_state* state = fe->demodulator_priv;
 328
 329         static u8 top_ctrl_cfg[]   = { TOP_CONTROL, 0x03 };
 330
 331         int err;
 332         /* Change only if we are actually changing the modulation */
 333         if (state->current_modulation != param->u.vsb.modulation) {
 334                 switch(param->u.vsb.modulation) {
 335                 case VSB_8:
 336                         dprintk("%s: VSB_8 MODE\n", __FUNCTION__);
 337
 338                         /* Select VSB mode */
 339                         top_ctrl_cfg[1] = 0x03;
 340
 341                         /* Select ANT connector if supported by card */
 342                         if (state->config->pll_rf_set)
 343                                 state->config->pll_rf_set(fe, 1);
 344
 345                         if (state->config->demod_chip == LGDT3303) {
 346                                 err = i2c_write_demod_bytes(state, lgdt3303_8vsb_44_data,
 347                                                             sizeof(lgdt3303_8vsb_44_data));
 348                         }
 349                         break;
 350
 351                 case QAM_64:
 352                         dprintk("%s: QAM_64 MODE\n", __FUNCTION__);
 353
 354                         /* Select QAM_64 mode */
 355                         top_ctrl_cfg[1] = 0x00;
 356
 357                         /* Select CABLE connector if supported by card */
 358                         if (state->config->pll_rf_set)
 359                                 state->config->pll_rf_set(fe, 0);
 360
 361                         if (state->config->demod_chip == LGDT3303) {
 362                                 err = i2c_write_demod_bytes(state, lgdt3303_qam_data,
 363                                                                                         sizeof(lgdt3303_qam_data));
 364                         }
 365                         break;
 366
 367                 case QAM_256:
 368                         dprintk("%s: QAM_256 MODE\n", __FUNCTION__);
 369
 370                         /* Select QAM_256 mode */
 371                         top_ctrl_cfg[1] = 0x01;
 372
 373                         /* Select CABLE connector if supported by card */
 374                         if (state->config->pll_rf_set)
 375                                 state->config->pll_rf_set(fe, 0);
 376
 377                         if (state->config->demod_chip == LGDT3303) {
 378                                 err = i2c_write_demod_bytes(state, lgdt3303_qam_data,
 379                                                                                         sizeof(lgdt3303_qam_data));
 380                         }
 381                         break;
 382                 default:
 383                         printk(KERN_WARNING "lgdt330x: %s: Modulation type(%d) UNSUPPORTED\n", __FUNCTION__, param->u.vsb.modulation);
 384                         return -1;
 385                 }
 386                 /*
 387                  * select serial or parallel MPEG harware interface
 388                  * Serial:   0x04 for LGDT3302 or 0x40 for LGDT3303
 389                  * Parallel: 0x00
 390                  */
 391                 top_ctrl_cfg[1] |= state->config->serial_mpeg;
 392
 393                 /* Select the requested mode */
 394                 i2c_write_demod_bytes(state, top_ctrl_cfg,
 395                                       sizeof(top_ctrl_cfg));
 396                 if (state->config->set_ts_params)
 397                         state->config->set_ts_params(fe, 0);
 398                 state->current_modulation = param->u.vsb.modulation;
 399         }
 400
 401         /* Tune to the specified frequency */
 402         if (fe->ops.tuner_ops.set_params) {
 403                 fe->ops.tuner_ops.set_params(fe, param);
 404                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 405         }
 406
 407         /* Keep track of the new frequency */
 408         /* FIXME this is the wrong way to do this...           */
 409         /* The tuner is shared with the video4linux analog API */
 410         state->current_frequency = param->frequency;
 411
 412         lgdt330x_SwReset(state);
 413         return 0;
 414 }
 415
 416 static int lgdt330x_get_frontend(struct dvb_frontend* fe,
 417                                  struct dvb_frontend_parameters* param)
 418 {
 419         struct lgdt330x_state *state = fe->demodulator_priv;
 420         param->frequency = state->current_frequency;
 421         return 0;
 422 }
 423
 424 static int lgdt3302_read_status(struct dvb_frontend* fe, fe_status_t* status)
 425 {
 426         struct lgdt330x_state* state = fe->demodulator_priv;
 427         u8 buf[3];
 428
 429         *status = 0; /* Reset status result */
 430
 431         /* AGC status register */
 432         i2c_read_demod_bytes(state, AGC_STATUS, buf, 1);
 433         dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]);
 434         if ((buf[0] & 0x0c) == 0x8){
 435                 /* Test signal does not exist flag */
 436                 /* as well as the AGC lock flag.   */
 437                 *status |= FE_HAS_SIGNAL;
 438         }
 439
 440         /*
 441          * You must set the Mask bits to 1 in the IRQ_MASK in order
 442          * to see that status bit in the IRQ_STATUS register.
 443          * This is done in SwReset();
 444          */
 445         /* signal status */
 446         i2c_read_demod_bytes(state, TOP_CONTROL, buf, sizeof(buf));
 447         dprintk("%s: TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n", __FUNCTION__, buf[0], buf[1], buf[2]);
 448
 449
 450         /* sync status */
 451         if ((buf[2] & 0x03) == 0x01) {
 452                 *status |= FE_HAS_SYNC;
 453         }
 454
 455         /* FEC error status */
 456         if ((buf[2] & 0x0c) == 0x08) {
 457                 *status |= FE_HAS_LOCK;
 458                 *status |= FE_HAS_VITERBI;
 459         }
 460
 461         /* Carrier Recovery Lock Status Register */
 462         i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
 463         dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]);
 464         switch (state->current_modulation) {
 465         case QAM_256:
 466         case QAM_64:
 467                 /* Need to undestand why there are 3 lock levels here */
 468                 if ((buf[0] & 0x07) == 0x07)
 469                         *status |= FE_HAS_CARRIER;
 470                 break;
 471         case VSB_8:
 472                 if ((buf[0] & 0x80) == 0x80)
 473                         *status |= FE_HAS_CARRIER;
 474                 break;
 475         default:
 476                 printk("KERN_WARNING lgdt330x: %s: Modulation set to unsupported value\n", __FUNCTION__);
 477         }
 478
 479         return 0;
 480 }
 481
 482 static int lgdt3303_read_status(struct dvb_frontend* fe, fe_status_t* status)
 483 {
 484         struct lgdt330x_state* state = fe->demodulator_priv;
 485         int err;
 486         u8 buf[3];
 487
 488         *status = 0; /* Reset status result */
 489
 490         /* lgdt3303 AGC status register */
 491         err = i2c_read_demod_bytes(state, 0x58, buf, 1);
 492         if (err < 0)
 493                 return err;
 494
 495         dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]);
 496         if ((buf[0] & 0x21) == 0x01){
 497                 /* Test input signal does not exist flag */
 498                 /* as well as the AGC lock flag.   */
 499                 *status |= FE_HAS_SIGNAL;
 500         }
 501
 502         /* Carrier Recovery Lock Status Register */
 503         i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
 504         dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]);
 505         switch (state->current_modulation) {
 506         case QAM_256:
 507         case QAM_64:
 508                 /* Need to undestand why there are 3 lock levels here */
 509                 if ((buf[0] & 0x07) == 0x07)
 510                         *status |= FE_HAS_CARRIER;
 511                 else
 512                         break;
 513                 i2c_read_demod_bytes(state, 0x8a, buf, 1);
 514                 if ((buf[0] & 0x04) == 0x04)
 515                         *status |= FE_HAS_SYNC;
 516                 if ((buf[0] & 0x01) == 0x01)
 517                         *status |= FE_HAS_LOCK;
 518                 if ((buf[0] & 0x08) == 0x08)
 519                         *status |= FE_HAS_VITERBI;
 520                 break;
 521         case VSB_8:
 522                 if ((buf[0] & 0x80) == 0x80)
 523                         *status |= FE_HAS_CARRIER;
 524                 else
 525                         break;
 526                 i2c_read_demod_bytes(state, 0x38, buf, 1);
 527                 if ((buf[0] & 0x02) == 0x00)
 528                         *status |= FE_HAS_SYNC;
 529                 if ((buf[0] & 0x01) == 0x01) {
 530                         *status |= FE_HAS_LOCK;
 531                         *status |= FE_HAS_VITERBI;
 532                 }
 533                 break;
 534         default:
 535                 printk("KERN_WARNING lgdt330x: %s: Modulation set to unsupported value\n", __FUNCTION__);
 536         }
 537         return 0;
 538 }
 539
 540 static int lgdt330x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 541 {
 542         /* not directly available. */
 543         *strength = 0;
 544         return 0;
 545 }
 546
 547 static int lgdt3302_read_snr(struct dvb_frontend* fe, u16* snr)
 548 {
 549 #ifdef SNR_IN_DB
 550         /*
 551          * Spec sheet shows formula for SNR_EQ = 10 log10(25 * 24**2 / noise)
 552          * and SNR_PH = 10 log10(25 * 32**2 / noise) for equalizer and phase tracker
 553          * respectively. The following tables are built on these formulas.
 554          * The usual definition is SNR = 20 log10(signal/noise)
 555          * If the specification is wrong the value retuned is 1/2 the actual SNR in db.
 556          *
 557          * This table is a an ordered list of noise values computed by the
 558          * formula from the spec sheet such that the index into the table
 559          * starting at 43 or 45 is the SNR value in db. There are duplicate noise
 560          * value entries at the beginning because the SNR varies more than
 561          * 1 db for a change of 1 digit in noise at very small values of noise.
 562          *
 563          * Examples from SNR_EQ table:
 564          * noise SNR
 565          *   0    43
 566          *   1    42
 567          *   2    39
 568          *   3    37
 569          *   4    36
 570          *   5    35
 571          *   6    34
 572          *   7    33
 573          *   8    33
 574          *   9    32
 575          *   10   32
 576          *   11   31
 577          *   12   31
 578          *   13   30
 579          */
 580
 581         static const u32 SNR_EQ[] =
 582                 { 1,     2,      2,      2, 3,      3,      4,     4,     5,     7,
 583                   9,     11,     13,     17, 21,     26,     33,    41,    52,    65,
 584                   81,    102,    129,    162, 204,    257,    323,   406,   511,   644,
 585                   810,   1020,   1284,   1616, 2035,   2561,   3224,  4059,  5110,  6433,
 586                   8098,  10195,  12835,  16158, 20341,  25608,  32238, 40585, 51094, 64323,
 587                   80978, 101945, 128341, 161571, 203406, 256073, 0x40000
 588                 };
 589
 590         static const u32 SNR_PH[] =
 591                 { 1,     2,      2,      2,      3,      3,     4,     5,     6,     8,
 592                   10,    12,     15,     19,     23,     29, 37,    46,    58,    73,
 593                   91,    115,    144,    182,    229,    288, 362,   456,   574,   722,
 594                   909,   1144,   1440,   1813,   2282,   2873, 3617,  4553,  5732,  7216,
 595                   9084,  11436,  14396,  18124,  22817,  28724,  36161, 45524, 57312, 72151,
 596                   90833, 114351, 143960, 181235, 228161, 0x080000
 597                 };
 598
 599         static u8 buf[5];/* read data buffer */
 600         static u32 noise;   /* noise value */
 601         static u32 snr_db;  /* index into SNR_EQ[] */
 602         struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
 603
 604         /* read both equalizer and phase tracker noise data */
 605         i2c_read_demod_bytes(state, EQPH_ERR0, buf, sizeof(buf));
 606
 607         if (state->current_modulation == VSB_8) {
 608                 /* Equalizer Mean-Square Error Register for VSB */
 609                 noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2];
 610
 611                 /*
 612                  * Look up noise value in table.
 613                  * A better search algorithm could be used...
 614                  * watch out there are duplicate entries.
 615                  */
 616                 for (snr_db = 0; snr_db < sizeof(SNR_EQ); snr_db++) {
 617                         if (noise < SNR_EQ[snr_db]) {
 618                                 *snr = 43 - snr_db;
 619                                 break;
 620                         }
 621                 }
 622         } else {
 623                 /* Phase Tracker Mean-Square Error Register for QAM */
 624                 noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
 625
 626                 /* Look up noise value in table. */
 627                 for (snr_db = 0; snr_db < sizeof(SNR_PH); snr_db++) {
 628                         if (noise < SNR_PH[snr_db]) {
 629                                 *snr = 45 - snr_db;
 630                                 break;
 631                         }
 632                 }
 633         }
 634 #else
 635         /* Return the raw noise value */
 636         static u8 buf[5];/* read data buffer */
 637         static u32 noise;   /* noise value */
 638         struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
 639
 640         /* read both equalizer and pase tracker noise data */
 641         i2c_read_demod_bytes(state, EQPH_ERR0, buf, sizeof(buf));
 642
 643         if (state->current_modulation == VSB_8) {
 644                 /* Phase Tracker Mean-Square Error Register for VSB */
 645                 noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
 646         } else {
 647
 648                 /* Carrier Recovery Mean-Square Error for QAM */
 649                 i2c_read_demod_bytes(state, 0x1a, buf, 2);
 650                 noise = ((buf[0] & 3) << 8) | buf[1];
 651         }
 652
 653         /* Small values for noise mean signal is better so invert noise */
 654         *snr = ~noise;
 655 #endif
 656
 657         dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr);
 658
 659         return 0;
 660 }
 661
 662 static int lgdt3303_read_snr(struct dvb_frontend* fe, u16* snr)
 663 {
 664         /* Return the raw noise value */
 665         static u8 buf[5];/* read data buffer */
 666         static u32 noise;   /* noise value */
 667         struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
 668
 669         if (state->current_modulation == VSB_8) {
 670
 671                 i2c_read_demod_bytes(state, 0x6e, buf, 5);
 672                 /* Phase Tracker Mean-Square Error Register for VSB */
 673                 noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4];
 674         } else {
 675
 676                 /* Carrier Recovery Mean-Square Error for QAM */
 677                 i2c_read_demod_bytes(state, 0x1a, buf, 2);
 678                 noise = (buf[0] << 8) | buf[1];
 679         }
 680
 681         /* Small values for noise mean signal is better so invert noise */
 682         *snr = ~noise;
 683
 684         dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr);
 685
 686         return 0;
 687 }
 688
 689 static int lgdt330x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
 690 {
 691         /* I have no idea about this - it may not be needed */
 692         fe_tune_settings->min_delay_ms = 500;
 693         fe_tune_settings->step_size = 0;
 694         fe_tune_settings->max_drift = 0;
 695         return 0;
 696 }
 697
 698 static void lgdt330x_release(struct dvb_frontend* fe)
 699 {
 700         struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
 701         kfree(state);
 702 }
 703
 704 static struct dvb_frontend_ops lgdt3302_ops;
 705 static struct dvb_frontend_ops lgdt3303_ops;
 706
 707 struct dvb_frontend* lgdt330x_attach(const struct lgdt330x_config* config,
 708                                      struct i2c_adapter* i2c)
 709 {
 710         struct lgdt330x_state* state = NULL;
 711         u8 buf[1];
 712
 713         /* Allocate memory for the internal state */
 714         state = kzalloc(sizeof(struct lgdt330x_state), GFP_KERNEL);
 715         if (state == NULL)
 716                 goto error;
 717
 718         /* Setup the state */
 719         state->config = config;
 720         state->i2c = i2c;
 721
 722         /* Create dvb_frontend */
 723         switch (config->demod_chip) {
 724         case LGDT3302:
 725                 memcpy(&state->frontend.ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops));
 726                 break;
 727         case LGDT3303:
 728                 memcpy(&state->frontend.ops, &lgdt3303_ops, sizeof(struct dvb_frontend_ops));
 729                 break;
 730         default:
 731                 goto error;
 732         }
 733         state->frontend.demodulator_priv = state;
 734
 735         /* Verify communication with demod chip */
 736         if (i2c_read_demod_bytes(state, 2, buf, 1))
 737                 goto error;
 738
 739         state->current_frequency = -1;
 740         state->current_modulation = -1;
 741
 742         return &state->frontend;
 743
 744 error:
 745         kfree(state);
 746         dprintk("%s: ERROR\n",__FUNCTION__);
 747         return NULL;
 748 }
 749
 750 static struct dvb_frontend_ops lgdt3302_ops = {
 751         .info = {
 752                 .name= "LG Electronics LGDT3302 VSB/QAM Frontend",
 753                 .type = FE_ATSC,
 754                 .frequency_min= 54000000,
 755                 .frequency_max= 858000000,
 756                 .frequency_stepsize= 62500,
 757                 .symbol_rate_min    = 5056941,  /* QAM 64 */
 758                 .symbol_rate_max    = 10762000, /* VSB 8  */
 759                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 760         },
 761         .init                 = lgdt330x_init,
 762         .set_frontend         = lgdt330x_set_parameters,
 763         .get_frontend         = lgdt330x_get_frontend,
 764         .get_tune_settings    = lgdt330x_get_tune_settings,
 765         .read_status          = lgdt3302_read_status,
 766         .read_ber             = lgdt330x_read_ber,
 767         .read_signal_strength = lgdt330x_read_signal_strength,
 768         .read_snr             = lgdt3302_read_snr,
 769         .read_ucblocks        = lgdt330x_read_ucblocks,
 770         .release              = lgdt330x_release,
 771 };
 772
 773 static struct dvb_frontend_ops lgdt3303_ops = {
 774         .info = {
 775                 .name= "LG Electronics LGDT3303 VSB/QAM Frontend",
 776                 .type = FE_ATSC,
 777                 .frequency_min= 54000000,
 778                 .frequency_max= 858000000,
 779                 .frequency_stepsize= 62500,
 780                 .symbol_rate_min    = 5056941,  /* QAM 64 */
 781                 .symbol_rate_max    = 10762000, /* VSB 8  */
 782                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 783         },
 784         .init                 = lgdt330x_init,
 785         .set_frontend         = lgdt330x_set_parameters,
 786         .get_frontend         = lgdt330x_get_frontend,
 787         .get_tune_settings    = lgdt330x_get_tune_settings,
 788         .read_status          = lgdt3303_read_status,
 789         .read_ber             = lgdt330x_read_ber,
 790         .read_signal_strength = lgdt330x_read_signal_strength,
 791         .read_snr             = lgdt3303_read_snr,
 792         .read_ucblocks        = lgdt330x_read_ucblocks,
 793         .release              = lgdt330x_release,
 794 };
 795
 796 MODULE_DESCRIPTION("LGDT330X (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver");
 797 MODULE_AUTHOR("Wilson Michaels");
 798 MODULE_LICENSE("GPL");
 799
 800 EXPORT_SYMBOL(lgdt330x_attach);
 801
 802 /*
 803  * Local variables:
 804  * c-basic-offset: 8
 805  * End:
 806  */