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   1 /*
   2  *    Support for NXT2002 and NXT2004 - VSB/QAM
   3  *
   4  *    Copyright (C) 2005 Kirk Lapray <kirk.lapray@gmail.com>
   5  *    Copyright (C) 2006 Michael Krufky <mkrufky@m1k.net>
   6  *    based on nxt2002 by Taylor Jacob <rtjacob@earthlink.net>
   7  *    and nxt2004 by Jean-Francois Thibert <jeanfrancois@sagetv.com>
   8  *
   9  *    This program is free software; you can redistribute it and/or modify
  10  *    it under the terms of the GNU General Public License as published by
  11  *    the Free Software Foundation; either version 2 of the License, or
  12  *    (at your option) any later version.
  13  *
  14  *    This program is distributed in the hope that it will be useful,
  15  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *    GNU General Public License for more details.
  18  *
  19  *    You should have received a copy of the GNU General Public License
  20  *    along with this program; if not, write to the Free Software
  21  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23 */
  24
  25 /*
  26  *                      NOTES ABOUT THIS DRIVER
  27  *
  28  * This Linux driver supports:
  29  *   B2C2/BBTI Technisat Air2PC - ATSC (NXT2002)
  30  *   AverTVHD MCE A180 (NXT2004)
  31  *   ATI HDTV Wonder (NXT2004)
  32  *
  33  * This driver needs external firmware. Please use the command
  34  * "<kerneldir>/Documentation/dvb/get_dvb_firmware nxt2002" or
  35  * "<kerneldir>/Documentation/dvb/get_dvb_firmware nxt2004" to
  36  * download/extract the appropriate firmware, and then copy it to
  37  * /usr/lib/hotplug/firmware/ or /lib/firmware/
  38  * (depending on configuration of firmware hotplug).
  39  */
  40 #define NXT2002_DEFAULT_FIRMWARE "dvb-fe-nxt2002.fw"
  41 #define NXT2004_DEFAULT_FIRMWARE "dvb-fe-nxt2004.fw"
  42 #define CRC_CCIT_MASK 0x1021
  43
  44 #include <linux/kernel.h>
  45 #include <linux/init.h>
  46 #include <linux/module.h>
  47 #include <linux/slab.h>
  48 #include <linux/string.h>
  49
  50 #include "dvb_frontend.h"
  51 #include "nxt200x.h"
  52
  53 struct nxt200x_state {
  54
  55         struct i2c_adapter* i2c;
  56         const struct nxt200x_config* config;
  57         struct dvb_frontend frontend;
  58
  59         /* demodulator private data */
  60         nxt_chip_type demod_chip;
  61         u8 initialised:1;
  62 };
  63
  64 static int debug;
  65 #define dprintk(args...) \
  66         do { \
  67                 if (debug) printk(KERN_DEBUG "nxt200x: " args); \
  68         } while (0)
  69
  70 static int i2c_writebytes (struct nxt200x_state* state, u8 addr, u8 *buf, u8 len)
  71 {
  72         int err;
  73         struct i2c_msg msg = { .addr = addr, .flags = 0, .buf = buf, .len = len };
  74
  75         if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
  76                 printk (KERN_WARNING "nxt200x: %s: i2c write error (addr 0x%02x, err == %i)\n",
  77                         __func__, addr, err);
  78                 return -EREMOTEIO;
  79         }
  80         return 0;
  81 }
  82
  83 static int i2c_readbytes(struct nxt200x_state *state, u8 addr, u8 *buf, u8 len)
  84 {
  85         int err;
  86         struct i2c_msg msg = { .addr = addr, .flags = I2C_M_RD, .buf = buf, .len = len };
  87
  88         if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
  89                 printk (KERN_WARNING "nxt200x: %s: i2c read error (addr 0x%02x, err == %i)\n",
  90                         __func__, addr, err);
  91                 return -EREMOTEIO;
  92         }
  93         return 0;
  94 }
  95
  96 static int nxt200x_writebytes (struct nxt200x_state* state, u8 reg,
  97                                const u8 *buf, u8 len)
  98 {
  99         u8 buf2 [len+1];
 100         int err;
 101         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf2, .len = len + 1 };
 102
 103         buf2[0] = reg;
 104         memcpy(&buf2[1], buf, len);
 105
 106         if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
 107                 printk (KERN_WARNING "nxt200x: %s: i2c write error (addr 0x%02x, err == %i)\n",
 108                         __func__, state->config->demod_address, err);
 109                 return -EREMOTEIO;
 110         }
 111         return 0;
 112 }
 113
 114 static int nxt200x_readbytes(struct nxt200x_state *state, u8 reg, u8 *buf, u8 len)
 115 {
 116         u8 reg2 [] = { reg };
 117
 118         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = reg2, .len = 1 },
 119                         { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = buf, .len = len } };
 120
 121         int err;
 122
 123         if ((err = i2c_transfer (state->i2c, msg, 2)) != 2) {
 124                 printk (KERN_WARNING "nxt200x: %s: i2c read error (addr 0x%02x, err == %i)\n",
 125                         __func__, state->config->demod_address, err);
 126                 return -EREMOTEIO;
 127         }
 128         return 0;
 129 }
 130
 131 static u16 nxt200x_crc(u16 crc, u8 c)
 132 {
 133         u8 i;
 134         u16 input = (u16) c & 0xFF;
 135
 136         input<<=8;
 137         for(i=0; i<8; i++) {
 138                 if((crc^input) & 0x8000)
 139                         crc=(crc<<1)^CRC_CCIT_MASK;
 140                 else
 141                         crc<<=1;
 142                 input<<=1;
 143         }
 144         return crc;
 145 }
 146
 147 static int nxt200x_writereg_multibyte (struct nxt200x_state* state, u8 reg, u8* data, u8 len)
 148 {
 149         u8 attr, len2, buf;
 150         dprintk("%s\n", __func__);
 151
 152         /* set mutli register register */
 153         nxt200x_writebytes(state, 0x35, &reg, 1);
 154
 155         /* send the actual data */
 156         nxt200x_writebytes(state, 0x36, data, len);
 157
 158         switch (state->demod_chip) {
 159                 case NXT2002:
 160                         len2 = len;
 161                         buf = 0x02;
 162                         break;
 163                 case NXT2004:
 164                         /* probably not right, but gives correct values */
 165                         attr = 0x02;
 166                         if (reg & 0x80) {
 167                                 attr = attr << 1;
 168                                 if (reg & 0x04)
 169                                         attr = attr >> 1;
 170                         }
 171                         /* set write bit */
 172                         len2 = ((attr << 4) | 0x10) | len;
 173                         buf = 0x80;
 174                         break;
 175                 default:
 176                         return -EINVAL;
 177                         break;
 178         }
 179
 180         /* set multi register length */
 181         nxt200x_writebytes(state, 0x34, &len2, 1);
 182
 183         /* toggle the multireg write bit */
 184         nxt200x_writebytes(state, 0x21, &buf, 1);
 185
 186         nxt200x_readbytes(state, 0x21, &buf, 1);
 187
 188         switch (state->demod_chip) {
 189                 case NXT2002:
 190                         if ((buf & 0x02) == 0)
 191                                 return 0;
 192                         break;
 193                 case NXT2004:
 194                         if (buf == 0)
 195                                 return 0;
 196                         break;
 197                 default:
 198                         return -EINVAL;
 199                         break;
 200         }
 201
 202         printk(KERN_WARNING "nxt200x: Error writing multireg register 0x%02X\n",reg);
 203
 204         return 0;
 205 }
 206
 207 static int nxt200x_readreg_multibyte (struct nxt200x_state* state, u8 reg, u8* data, u8 len)
 208 {
 209         int i;
 210         u8 buf, len2, attr;
 211         dprintk("%s\n", __func__);
 212
 213         /* set mutli register register */
 214         nxt200x_writebytes(state, 0x35, &reg, 1);
 215
 216         switch (state->demod_chip) {
 217                 case NXT2002:
 218                         /* set multi register length */
 219                         len2 = len & 0x80;
 220                         nxt200x_writebytes(state, 0x34, &len2, 1);
 221
 222                         /* read the actual data */
 223                         nxt200x_readbytes(state, reg, data, len);
 224                         return 0;
 225                         break;
 226                 case NXT2004:
 227                         /* probably not right, but gives correct values */
 228                         attr = 0x02;
 229                         if (reg & 0x80) {
 230                                 attr = attr << 1;
 231                                 if (reg & 0x04)
 232                                         attr = attr >> 1;
 233                         }
 234
 235                         /* set multi register length */
 236                         len2 = (attr << 4) | len;
 237                         nxt200x_writebytes(state, 0x34, &len2, 1);
 238
 239                         /* toggle the multireg bit*/
 240                         buf = 0x80;
 241                         nxt200x_writebytes(state, 0x21, &buf, 1);
 242
 243                         /* read the actual data */
 244                         for(i = 0; i < len; i++) {
 245                                 nxt200x_readbytes(state, 0x36 + i, &data[i], 1);
 246                         }
 247                         return 0;
 248                         break;
 249                 default:
 250                         return -EINVAL;
 251                         break;
 252         }
 253 }
 254
 255 static void nxt200x_microcontroller_stop (struct nxt200x_state* state)
 256 {
 257         u8 buf, stopval, counter = 0;
 258         dprintk("%s\n", __func__);
 259
 260         /* set correct stop value */
 261         switch (state->demod_chip) {
 262                 case NXT2002:
 263                         stopval = 0x40;
 264                         break;
 265                 case NXT2004:
 266                         stopval = 0x10;
 267                         break;
 268                 default:
 269                         stopval = 0;
 270                         break;
 271         }
 272
 273         buf = 0x80;
 274         nxt200x_writebytes(state, 0x22, &buf, 1);
 275
 276         while (counter < 20) {
 277                 nxt200x_readbytes(state, 0x31, &buf, 1);
 278                 if (buf & stopval)
 279                         return;
 280                 msleep(10);
 281                 counter++;
 282         }
 283
 284         printk(KERN_WARNING "nxt200x: Timeout waiting for nxt200x to stop. This is ok after firmware upload.\n");
 285         return;
 286 }
 287
 288 static void nxt200x_microcontroller_start (struct nxt200x_state* state)
 289 {
 290         u8 buf;
 291         dprintk("%s\n", __func__);
 292
 293         buf = 0x00;
 294         nxt200x_writebytes(state, 0x22, &buf, 1);
 295 }
 296
 297 static void nxt2004_microcontroller_init (struct nxt200x_state* state)
 298 {
 299         u8 buf[9];
 300         u8 counter = 0;
 301         dprintk("%s\n", __func__);
 302
 303         buf[0] = 0x00;
 304         nxt200x_writebytes(state, 0x2b, buf, 1);
 305         buf[0] = 0x70;
 306         nxt200x_writebytes(state, 0x34, buf, 1);
 307         buf[0] = 0x04;
 308         nxt200x_writebytes(state, 0x35, buf, 1);
 309         buf[0] = 0x01; buf[1] = 0x23; buf[2] = 0x45; buf[3] = 0x67; buf[4] = 0x89;
 310         buf[5] = 0xAB; buf[6] = 0xCD; buf[7] = 0xEF; buf[8] = 0xC0;
 311         nxt200x_writebytes(state, 0x36, buf, 9);
 312         buf[0] = 0x80;
 313         nxt200x_writebytes(state, 0x21, buf, 1);
 314
 315         while (counter < 20) {
 316                 nxt200x_readbytes(state, 0x21, buf, 1);
 317                 if (buf[0] == 0)
 318                         return;
 319                 msleep(10);
 320                 counter++;
 321         }
 322
 323         printk(KERN_WARNING "nxt200x: Timeout waiting for nxt2004 to init.\n");
 324
 325         return;
 326 }
 327
 328 static int nxt200x_writetuner (struct nxt200x_state* state, u8* data)
 329 {
 330         u8 buf, count = 0;
 331
 332         dprintk("%s\n", __func__);
 333
 334         dprintk("Tuner Bytes: %02X %02X %02X %02X\n", data[1], data[2], data[3], data[4]);
 335
 336         /* if NXT2004, write directly to tuner. if NXT2002, write through NXT chip.
 337          * direct write is required for Philips TUV1236D and ALPS TDHU2 */
 338         switch (state->demod_chip) {
 339                 case NXT2004:
 340                         if (i2c_writebytes(state, data[0], data+1, 4))
 341                                 printk(KERN_WARNING "nxt200x: error writing to tuner\n");
 342                         /* wait until we have a lock */
 343                         while (count < 20) {
 344                                 i2c_readbytes(state, data[0], &buf, 1);
 345                                 if (buf & 0x40)
 346                                         return 0;
 347                                 msleep(100);
 348                                 count++;
 349                         }
 350                         printk("nxt2004: timeout waiting for tuner lock\n");
 351                         break;
 352                 case NXT2002:
 353                         /* set the i2c transfer speed to the tuner */
 354                         buf = 0x03;
 355                         nxt200x_writebytes(state, 0x20, &buf, 1);
 356
 357                         /* setup to transfer 4 bytes via i2c */
 358                         buf = 0x04;
 359                         nxt200x_writebytes(state, 0x34, &buf, 1);
 360
 361                         /* write actual tuner bytes */
 362                         nxt200x_writebytes(state, 0x36, data+1, 4);
 363
 364                         /* set tuner i2c address */
 365                         buf = data[0] << 1;
 366                         nxt200x_writebytes(state, 0x35, &buf, 1);
 367
 368                         /* write UC Opmode to begin transfer */
 369                         buf = 0x80;
 370                         nxt200x_writebytes(state, 0x21, &buf, 1);
 371
 372                         while (count < 20) {
 373                                 nxt200x_readbytes(state, 0x21, &buf, 1);
 374                                 if ((buf & 0x80)== 0x00)
 375                                         return 0;
 376                                 msleep(100);
 377                                 count++;
 378                         }
 379                         printk("nxt2002: timeout error writing tuner\n");
 380                         break;
 381                 default:
 382                         return -EINVAL;
 383                         break;
 384         }
 385         return 0;
 386 }
 387
 388 static void nxt200x_agc_reset(struct nxt200x_state* state)
 389 {
 390         u8 buf;
 391         dprintk("%s\n", __func__);
 392
 393         switch (state->demod_chip) {
 394                 case NXT2002:
 395                         buf = 0x08;
 396                         nxt200x_writebytes(state, 0x08, &buf, 1);
 397                         buf = 0x00;
 398                         nxt200x_writebytes(state, 0x08, &buf, 1);
 399                         break;
 400                 case NXT2004:
 401                         nxt200x_readreg_multibyte(state, 0x08, &buf, 1);
 402                         buf = 0x08;
 403                         nxt200x_writereg_multibyte(state, 0x08, &buf, 1);
 404                         buf = 0x00;
 405                         nxt200x_writereg_multibyte(state, 0x08, &buf, 1);
 406                         break;
 407                 default:
 408                         break;
 409         }
 410         return;
 411 }
 412
 413 static int nxt2002_load_firmware (struct dvb_frontend* fe, const struct firmware *fw)
 414 {
 415
 416         struct nxt200x_state* state = fe->demodulator_priv;
 417         u8 buf[3], written = 0, chunkpos = 0;
 418         u16 rambase, position, crc = 0;
 419
 420         dprintk("%s\n", __func__);
 421         dprintk("Firmware is %zu bytes\n", fw->size);
 422
 423         /* Get the RAM base for this nxt2002 */
 424         nxt200x_readbytes(state, 0x10, buf, 1);
 425
 426         if (buf[0] & 0x10)
 427                 rambase = 0x1000;
 428         else
 429                 rambase = 0x0000;
 430
 431         dprintk("rambase on this nxt2002 is %04X\n", rambase);
 432
 433         /* Hold the micro in reset while loading firmware */
 434         buf[0] = 0x80;
 435         nxt200x_writebytes(state, 0x2B, buf, 1);
 436
 437         for (position = 0; position < fw->size; position++) {
 438                 if (written == 0) {
 439                         crc = 0;
 440                         chunkpos = 0x28;
 441                         buf[0] = ((rambase + position) >> 8);
 442                         buf[1] = (rambase + position) & 0xFF;
 443                         buf[2] = 0x81;
 444                         /* write starting address */
 445                         nxt200x_writebytes(state, 0x29, buf, 3);
 446                 }
 447                 written++;
 448                 chunkpos++;
 449
 450                 if ((written % 4) == 0)
 451                         nxt200x_writebytes(state, chunkpos, &fw->data[position-3], 4);
 452
 453                 crc = nxt200x_crc(crc, fw->data[position]);
 454
 455                 if ((written == 255) || (position+1 == fw->size)) {
 456                         /* write remaining bytes of firmware */
 457                         nxt200x_writebytes(state, chunkpos+4-(written %4),
 458                                 &fw->data[position-(written %4) + 1],
 459                                 written %4);
 460                         buf[0] = crc << 8;
 461                         buf[1] = crc & 0xFF;
 462
 463                         /* write crc */
 464                         nxt200x_writebytes(state, 0x2C, buf, 2);
 465
 466                         /* do a read to stop things */
 467                         nxt200x_readbytes(state, 0x2A, buf, 1);
 468
 469                         /* set transfer mode to complete */
 470                         buf[0] = 0x80;
 471                         nxt200x_writebytes(state, 0x2B, buf, 1);
 472
 473                         written = 0;
 474                 }
 475         }
 476
 477         return 0;
 478 };
 479
 480 static int nxt2004_load_firmware (struct dvb_frontend* fe, const struct firmware *fw)
 481 {
 482
 483         struct nxt200x_state* state = fe->demodulator_priv;
 484         u8 buf[3];
 485         u16 rambase, position, crc=0;
 486
 487         dprintk("%s\n", __func__);
 488         dprintk("Firmware is %zu bytes\n", fw->size);
 489
 490         /* set rambase */
 491         rambase = 0x1000;
 492
 493         /* hold the micro in reset while loading firmware */
 494         buf[0] = 0x80;
 495         nxt200x_writebytes(state, 0x2B, buf,1);
 496
 497         /* calculate firmware CRC */
 498         for (position = 0; position < fw->size; position++) {
 499                 crc = nxt200x_crc(crc, fw->data[position]);
 500         }
 501
 502         buf[0] = rambase >> 8;
 503         buf[1] = rambase & 0xFF;
 504         buf[2] = 0x81;
 505         /* write starting address */
 506         nxt200x_writebytes(state,0x29,buf,3);
 507
 508         for (position = 0; position < fw->size;) {
 509                 nxt200x_writebytes(state, 0x2C, &fw->data[position],
 510                         fw->size-position > 255 ? 255 : fw->size-position);
 511                 position += (fw->size-position > 255 ? 255 : fw->size-position);
 512         }
 513         buf[0] = crc >> 8;
 514         buf[1] = crc & 0xFF;
 515
 516         dprintk("firmware crc is 0x%02X 0x%02X\n", buf[0], buf[1]);
 517
 518         /* write crc */
 519         nxt200x_writebytes(state, 0x2C, buf,2);
 520
 521         /* do a read to stop things */
 522         nxt200x_readbytes(state, 0x2C, buf, 1);
 523
 524         /* set transfer mode to complete */
 525         buf[0] = 0x80;
 526         nxt200x_writebytes(state, 0x2B, buf,1);
 527
 528         return 0;
 529 };
 530
 531 static int nxt200x_setup_frontend_parameters (struct dvb_frontend* fe,
 532                                              struct dvb_frontend_parameters *p)
 533 {
 534         struct nxt200x_state* state = fe->demodulator_priv;
 535         u8 buf[5];
 536
 537         /* stop the micro first */
 538         nxt200x_microcontroller_stop(state);
 539
 540         if (state->demod_chip == NXT2004) {
 541                 /* make sure demod is set to digital */
 542                 buf[0] = 0x04;
 543                 nxt200x_writebytes(state, 0x14, buf, 1);
 544                 buf[0] = 0x00;
 545                 nxt200x_writebytes(state, 0x17, buf, 1);
 546         }
 547
 548         /* set additional params */
 549         switch (p->u.vsb.modulation) {
 550                 case QAM_64:
 551                 case QAM_256:
 552                         /* Set punctured clock for QAM */
 553                         /* This is just a guess since I am unable to test it */
 554                         if (state->config->set_ts_params)
 555                                 state->config->set_ts_params(fe, 1);
 556                         break;
 557                 case VSB_8:
 558                         /* Set non-punctured clock for VSB */
 559                         if (state->config->set_ts_params)
 560                                 state->config->set_ts_params(fe, 0);
 561                         break;
 562                 default:
 563                         return -EINVAL;
 564                         break;
 565         }
 566
 567         if (fe->ops.tuner_ops.calc_regs) {
 568                 /* get tuning information */
 569                 fe->ops.tuner_ops.calc_regs(fe, p, buf, 5);
 570
 571                 /* write frequency information */
 572                 nxt200x_writetuner(state, buf);
 573         }
 574
 575         /* reset the agc now that tuning has been completed */
 576         nxt200x_agc_reset(state);
 577
 578         /* set target power level */
 579         switch (p->u.vsb.modulation) {
 580                 case QAM_64:
 581                 case QAM_256:
 582                         buf[0] = 0x74;
 583                         break;
 584                 case VSB_8:
 585                         buf[0] = 0x70;
 586                         break;
 587                 default:
 588                         return -EINVAL;
 589                         break;
 590         }
 591         nxt200x_writebytes(state, 0x42, buf, 1);
 592
 593         /* configure sdm */
 594         switch (state->demod_chip) {
 595                 case NXT2002:
 596                         buf[0] = 0x87;
 597                         break;
 598                 case NXT2004:
 599                         buf[0] = 0x07;
 600                         break;
 601                 default:
 602                         return -EINVAL;
 603                         break;
 604         }
 605         nxt200x_writebytes(state, 0x57, buf, 1);
 606
 607         /* write sdm1 input */
 608         buf[0] = 0x10;
 609         buf[1] = 0x00;
 610         switch (state->demod_chip) {
 611                 case NXT2002:
 612                         nxt200x_writereg_multibyte(state, 0x58, buf, 2);
 613                         break;
 614                 case NXT2004:
 615                         nxt200x_writebytes(state, 0x58, buf, 2);
 616                         break;
 617                 default:
 618                         return -EINVAL;
 619                         break;
 620         }
 621
 622         /* write sdmx input */
 623         switch (p->u.vsb.modulation) {
 624                 case QAM_64:
 625                                 buf[0] = 0x68;
 626                                 break;
 627                 case QAM_256:
 628                                 buf[0] = 0x64;
 629                                 break;
 630                 case VSB_8:
 631                                 buf[0] = 0x60;
 632                                 break;
 633                 default:
 634                                 return -EINVAL;
 635                                 break;
 636         }
 637         buf[1] = 0x00;
 638         switch (state->demod_chip) {
 639                 case NXT2002:
 640                         nxt200x_writereg_multibyte(state, 0x5C, buf, 2);
 641                         break;
 642                 case NXT2004:
 643                         nxt200x_writebytes(state, 0x5C, buf, 2);
 644                         break;
 645                 default:
 646                         return -EINVAL;
 647                         break;
 648         }
 649
 650         /* write adc power lpf fc */
 651         buf[0] = 0x05;
 652         nxt200x_writebytes(state, 0x43, buf, 1);
 653
 654         if (state->demod_chip == NXT2004) {
 655                 /* write ??? */
 656                 buf[0] = 0x00;
 657                 buf[1] = 0x00;
 658                 nxt200x_writebytes(state, 0x46, buf, 2);
 659         }
 660
 661         /* write accumulator2 input */
 662         buf[0] = 0x80;
 663         buf[1] = 0x00;
 664         switch (state->demod_chip) {
 665                 case NXT2002:
 666                         nxt200x_writereg_multibyte(state, 0x4B, buf, 2);
 667                         break;
 668                 case NXT2004:
 669                         nxt200x_writebytes(state, 0x4B, buf, 2);
 670                         break;
 671                 default:
 672                         return -EINVAL;
 673                         break;
 674         }
 675
 676         /* write kg1 */
 677         buf[0] = 0x00;
 678         nxt200x_writebytes(state, 0x4D, buf, 1);
 679
 680         /* write sdm12 lpf fc */
 681         buf[0] = 0x44;
 682         nxt200x_writebytes(state, 0x55, buf, 1);
 683
 684         /* write agc control reg */
 685         buf[0] = 0x04;
 686         nxt200x_writebytes(state, 0x41, buf, 1);
 687
 688         if (state->demod_chip == NXT2004) {
 689                 nxt200x_readreg_multibyte(state, 0x80, buf, 1);
 690                 buf[0] = 0x24;
 691                 nxt200x_writereg_multibyte(state, 0x80, buf, 1);
 692
 693                 /* soft reset? */
 694                 nxt200x_readreg_multibyte(state, 0x08, buf, 1);
 695                 buf[0] = 0x10;
 696                 nxt200x_writereg_multibyte(state, 0x08, buf, 1);
 697                 nxt200x_readreg_multibyte(state, 0x08, buf, 1);
 698                 buf[0] = 0x00;
 699                 nxt200x_writereg_multibyte(state, 0x08, buf, 1);
 700
 701                 nxt200x_readreg_multibyte(state, 0x80, buf, 1);
 702                 buf[0] = 0x04;
 703                 nxt200x_writereg_multibyte(state, 0x80, buf, 1);
 704                 buf[0] = 0x00;
 705                 nxt200x_writereg_multibyte(state, 0x81, buf, 1);
 706                 buf[0] = 0x80; buf[1] = 0x00; buf[2] = 0x00;
 707                 nxt200x_writereg_multibyte(state, 0x82, buf, 3);
 708                 nxt200x_readreg_multibyte(state, 0x88, buf, 1);
 709                 buf[0] = 0x11;
 710                 nxt200x_writereg_multibyte(state, 0x88, buf, 1);
 711                 nxt200x_readreg_multibyte(state, 0x80, buf, 1);
 712                 buf[0] = 0x44;
 713                 nxt200x_writereg_multibyte(state, 0x80, buf, 1);
 714         }
 715
 716         /* write agc ucgp0 */
 717         switch (p->u.vsb.modulation) {
 718                 case QAM_64:
 719                                 buf[0] = 0x02;
 720                                 break;
 721                 case QAM_256:
 722                                 buf[0] = 0x03;
 723                                 break;
 724                 case VSB_8:
 725                                 buf[0] = 0x00;
 726                                 break;
 727                 default:
 728                                 return -EINVAL;
 729                                 break;
 730         }
 731         nxt200x_writebytes(state, 0x30, buf, 1);
 732
 733         /* write agc control reg */
 734         buf[0] = 0x00;
 735         nxt200x_writebytes(state, 0x41, buf, 1);
 736
 737         /* write accumulator2 input */
 738         buf[0] = 0x80;
 739         buf[1] = 0x00;
 740         switch (state->demod_chip) {
 741                 case NXT2002:
 742                         nxt200x_writereg_multibyte(state, 0x49, buf, 2);
 743                         nxt200x_writereg_multibyte(state, 0x4B, buf, 2);
 744                         break;
 745                 case NXT2004:
 746                         nxt200x_writebytes(state, 0x49, buf, 2);
 747                         nxt200x_writebytes(state, 0x4B, buf, 2);
 748                         break;
 749                 default:
 750                         return -EINVAL;
 751                         break;
 752         }
 753
 754         /* write agc control reg */
 755         buf[0] = 0x04;
 756         nxt200x_writebytes(state, 0x41, buf, 1);
 757
 758         nxt200x_microcontroller_start(state);
 759
 760         if (state->demod_chip == NXT2004) {
 761                 nxt2004_microcontroller_init(state);
 762
 763                 /* ???? */
 764                 buf[0] = 0xF0;
 765                 buf[1] = 0x00;
 766                 nxt200x_writebytes(state, 0x5C, buf, 2);
 767         }
 768
 769         /* adjacent channel detection should be done here, but I don't
 770         have any stations with this need so I cannot test it */
 771
 772         return 0;
 773 }
 774
 775 static int nxt200x_read_status(struct dvb_frontend* fe, fe_status_t* status)
 776 {
 777         struct nxt200x_state* state = fe->demodulator_priv;
 778         u8 lock;
 779         nxt200x_readbytes(state, 0x31, &lock, 1);
 780
 781         *status = 0;
 782         if (lock & 0x20) {
 783                 *status |= FE_HAS_SIGNAL;
 784                 *status |= FE_HAS_CARRIER;
 785                 *status |= FE_HAS_VITERBI;
 786                 *status |= FE_HAS_SYNC;
 787                 *status |= FE_HAS_LOCK;
 788         }
 789         return 0;
 790 }
 791
 792 static int nxt200x_read_ber(struct dvb_frontend* fe, u32* ber)
 793 {
 794         struct nxt200x_state* state = fe->demodulator_priv;
 795         u8 b[3];
 796
 797         nxt200x_readreg_multibyte(state, 0xE6, b, 3);
 798
 799         *ber = ((b[0] << 8) + b[1]) * 8;
 800
 801         return 0;
 802 }
 803
 804 static int nxt200x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 805 {
 806         struct nxt200x_state* state = fe->demodulator_priv;
 807         u8 b[2];
 808         u16 temp = 0;
 809
 810         /* setup to read cluster variance */
 811         b[0] = 0x00;
 812         nxt200x_writebytes(state, 0xA1, b, 1);
 813
 814         /* get multreg val */
 815         nxt200x_readreg_multibyte(state, 0xA6, b, 2);
 816
 817         temp = (b[0] << 8) | b[1];
 818         *strength = ((0x7FFF - temp) & 0x0FFF) * 16;
 819
 820         return 0;
 821 }
 822
 823 static int nxt200x_read_snr(struct dvb_frontend* fe, u16* snr)
 824 {
 825
 826         struct nxt200x_state* state = fe->demodulator_priv;
 827         u8 b[2];
 828         u16 temp = 0, temp2;
 829         u32 snrdb = 0;
 830
 831         /* setup to read cluster variance */
 832         b[0] = 0x00;
 833         nxt200x_writebytes(state, 0xA1, b, 1);
 834
 835         /* get multreg val from 0xA6 */
 836         nxt200x_readreg_multibyte(state, 0xA6, b, 2);
 837
 838         temp = (b[0] << 8) | b[1];
 839         temp2 = 0x7FFF - temp;
 840
 841         /* snr will be in db */
 842         if (temp2 > 0x7F00)
 843                 snrdb = 1000*24 + ( 1000*(30-24) * ( temp2 - 0x7F00 ) / ( 0x7FFF - 0x7F00 ) );
 844         else if (temp2 > 0x7EC0)
 845                 snrdb = 1000*18 + ( 1000*(24-18) * ( temp2 - 0x7EC0 ) / ( 0x7F00 - 0x7EC0 ) );
 846         else if (temp2 > 0x7C00)
 847                 snrdb = 1000*12 + ( 1000*(18-12) * ( temp2 - 0x7C00 ) / ( 0x7EC0 - 0x7C00 ) );
 848         else
 849                 snrdb = 1000*0 + ( 1000*(12-0) * ( temp2 - 0 ) / ( 0x7C00 - 0 ) );
 850
 851         /* the value reported back from the frontend will be FFFF=32db 0000=0db */
 852         *snr = snrdb * (0xFFFF/32000);
 853
 854         return 0;
 855 }
 856
 857 static int nxt200x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 858 {
 859         struct nxt200x_state* state = fe->demodulator_priv;
 860         u8 b[3];
 861
 862         nxt200x_readreg_multibyte(state, 0xE6, b, 3);
 863         *ucblocks = b[2];
 864
 865         return 0;
 866 }
 867
 868 static int nxt200x_sleep(struct dvb_frontend* fe)
 869 {
 870         return 0;
 871 }
 872
 873 static int nxt2002_init(struct dvb_frontend* fe)
 874 {
 875         struct nxt200x_state* state = fe->demodulator_priv;
 876         const struct firmware *fw;
 877         int ret;
 878         u8 buf[2];
 879
 880         /* request the firmware, this will block until someone uploads it */
 881         printk("nxt2002: Waiting for firmware upload (%s)...\n", NXT2002_DEFAULT_FIRMWARE);
 882         ret = request_firmware(&fw, NXT2002_DEFAULT_FIRMWARE, &state->i2c->dev);
 883         printk("nxt2002: Waiting for firmware upload(2)...\n");
 884         if (ret) {
 885                 printk("nxt2002: No firmware uploaded (timeout or file not found?)\n");
 886                 return ret;
 887         }
 888
 889         ret = nxt2002_load_firmware(fe, fw);
 890         release_firmware(fw);
 891         if (ret) {
 892                 printk("nxt2002: Writing firmware to device failed\n");
 893                 return ret;
 894         }
 895         printk("nxt2002: Firmware upload complete\n");
 896
 897         /* Put the micro into reset */
 898         nxt200x_microcontroller_stop(state);
 899
 900         /* ensure transfer is complete */
 901         buf[0]=0x00;
 902         nxt200x_writebytes(state, 0x2B, buf, 1);
 903
 904         /* Put the micro into reset for real this time */
 905         nxt200x_microcontroller_stop(state);
 906
 907         /* soft reset everything (agc,frontend,eq,fec)*/
 908         buf[0] = 0x0F;
 909         nxt200x_writebytes(state, 0x08, buf, 1);
 910         buf[0] = 0x00;
 911         nxt200x_writebytes(state, 0x08, buf, 1);
 912
 913         /* write agc sdm configure */
 914         buf[0] = 0xF1;
 915         nxt200x_writebytes(state, 0x57, buf, 1);
 916
 917         /* write mod output format */
 918         buf[0] = 0x20;
 919         nxt200x_writebytes(state, 0x09, buf, 1);
 920
 921         /* write fec mpeg mode */
 922         buf[0] = 0x7E;
 923         buf[1] = 0x00;
 924         nxt200x_writebytes(state, 0xE9, buf, 2);
 925
 926         /* write mux selection */
 927         buf[0] = 0x00;
 928         nxt200x_writebytes(state, 0xCC, buf, 1);
 929
 930         return 0;
 931 }
 932
 933 static int nxt2004_init(struct dvb_frontend* fe)
 934 {
 935         struct nxt200x_state* state = fe->demodulator_priv;
 936         const struct firmware *fw;
 937         int ret;
 938         u8 buf[3];
 939
 940         /* ??? */
 941         buf[0]=0x00;
 942         nxt200x_writebytes(state, 0x1E, buf, 1);
 943
 944         /* request the firmware, this will block until someone uploads it */
 945         printk("nxt2004: Waiting for firmware upload (%s)...\n", NXT2004_DEFAULT_FIRMWARE);
 946         ret = request_firmware(&fw, NXT2004_DEFAULT_FIRMWARE, &state->i2c->dev);
 947         printk("nxt2004: Waiting for firmware upload(2)...\n");
 948         if (ret) {
 949                 printk("nxt2004: No firmware uploaded (timeout or file not found?)\n");
 950                 return ret;
 951         }
 952
 953         ret = nxt2004_load_firmware(fe, fw);
 954         release_firmware(fw);
 955         if (ret) {
 956                 printk("nxt2004: Writing firmware to device failed\n");
 957                 return ret;
 958         }
 959         printk("nxt2004: Firmware upload complete\n");
 960
 961         /* ensure transfer is complete */
 962         buf[0] = 0x01;
 963         nxt200x_writebytes(state, 0x19, buf, 1);
 964
 965         nxt2004_microcontroller_init(state);
 966         nxt200x_microcontroller_stop(state);
 967         nxt200x_microcontroller_stop(state);
 968         nxt2004_microcontroller_init(state);
 969         nxt200x_microcontroller_stop(state);
 970
 971         /* soft reset everything (agc,frontend,eq,fec)*/
 972         buf[0] = 0xFF;
 973         nxt200x_writereg_multibyte(state, 0x08, buf, 1);
 974         buf[0] = 0x00;
 975         nxt200x_writereg_multibyte(state, 0x08, buf, 1);
 976
 977         /* write agc sdm configure */
 978         buf[0] = 0xD7;
 979         nxt200x_writebytes(state, 0x57, buf, 1);
 980
 981         /* ???*/
 982         buf[0] = 0x07;
 983         buf[1] = 0xfe;
 984         nxt200x_writebytes(state, 0x35, buf, 2);
 985         buf[0] = 0x12;
 986         nxt200x_writebytes(state, 0x34, buf, 1);
 987         buf[0] = 0x80;
 988         nxt200x_writebytes(state, 0x21, buf, 1);
 989
 990         /* ???*/
 991         buf[0] = 0x21;
 992         nxt200x_writebytes(state, 0x0A, buf, 1);
 993
 994         /* ???*/
 995         buf[0] = 0x01;
 996         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
 997
 998         /* write fec mpeg mode */
 999         buf[0] = 0x7E;
1000         buf[1] = 0x00;
1001         nxt200x_writebytes(state, 0xE9, buf, 2);
1002
1003         /* write mux selection */
1004         buf[0] = 0x00;
1005         nxt200x_writebytes(state, 0xCC, buf, 1);
1006
1007         /* ???*/
1008         nxt200x_readreg_multibyte(state, 0x80, buf, 1);
1009         buf[0] = 0x00;
1010         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
1011
1012         /* soft reset? */
1013         nxt200x_readreg_multibyte(state, 0x08, buf, 1);
1014         buf[0] = 0x10;
1015         nxt200x_writereg_multibyte(state, 0x08, buf, 1);
1016         nxt200x_readreg_multibyte(state, 0x08, buf, 1);
1017         buf[0] = 0x00;
1018         nxt200x_writereg_multibyte(state, 0x08, buf, 1);
1019
1020         /* ???*/
1021         nxt200x_readreg_multibyte(state, 0x80, buf, 1);
1022         buf[0] = 0x01;
1023         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
1024         buf[0] = 0x70;
1025         nxt200x_writereg_multibyte(state, 0x81, buf, 1);
1026         buf[0] = 0x31; buf[1] = 0x5E; buf[2] = 0x66;
1027         nxt200x_writereg_multibyte(state, 0x82, buf, 3);
1028
1029         nxt200x_readreg_multibyte(state, 0x88, buf, 1);
1030         buf[0] = 0x11;
1031         nxt200x_writereg_multibyte(state, 0x88, buf, 1);
1032         nxt200x_readreg_multibyte(state, 0x80, buf, 1);
1033         buf[0] = 0x40;
1034         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
1035
1036         nxt200x_readbytes(state, 0x10, buf, 1);
1037         buf[0] = 0x10;
1038         nxt200x_writebytes(state, 0x10, buf, 1);
1039         nxt200x_readbytes(state, 0x0A, buf, 1);
1040         buf[0] = 0x21;
1041         nxt200x_writebytes(state, 0x0A, buf, 1);
1042
1043         nxt2004_microcontroller_init(state);
1044
1045         buf[0] = 0x21;
1046         nxt200x_writebytes(state, 0x0A, buf, 1);
1047         buf[0] = 0x7E;
1048         nxt200x_writebytes(state, 0xE9, buf, 1);
1049         buf[0] = 0x00;
1050         nxt200x_writebytes(state, 0xEA, buf, 1);
1051
1052         nxt200x_readreg_multibyte(state, 0x80, buf, 1);
1053         buf[0] = 0x00;
1054         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
1055         nxt200x_readreg_multibyte(state, 0x80, buf, 1);
1056         buf[0] = 0x00;
1057         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
1058
1059         /* soft reset? */
1060         nxt200x_readreg_multibyte(state, 0x08, buf, 1);
1061         buf[0] = 0x10;
1062         nxt200x_writereg_multibyte(state, 0x08, buf, 1);
1063         nxt200x_readreg_multibyte(state, 0x08, buf, 1);
1064         buf[0] = 0x00;
1065         nxt200x_writereg_multibyte(state, 0x08, buf, 1);
1066
1067         nxt200x_readreg_multibyte(state, 0x80, buf, 1);
1068         buf[0] = 0x04;
1069         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
1070         buf[0] = 0x00;
1071         nxt200x_writereg_multibyte(state, 0x81, buf, 1);
1072         buf[0] = 0x80; buf[1] = 0x00; buf[2] = 0x00;
1073         nxt200x_writereg_multibyte(state, 0x82, buf, 3);
1074
1075         nxt200x_readreg_multibyte(state, 0x88, buf, 1);
1076         buf[0] = 0x11;
1077         nxt200x_writereg_multibyte(state, 0x88, buf, 1);
1078
1079         nxt200x_readreg_multibyte(state, 0x80, buf, 1);
1080         buf[0] = 0x44;
1081         nxt200x_writereg_multibyte(state, 0x80, buf, 1);
1082
1083         /* initialize tuner */
1084         nxt200x_readbytes(state, 0x10, buf, 1);
1085         buf[0] = 0x12;
1086         nxt200x_writebytes(state, 0x10, buf, 1);
1087         buf[0] = 0x04;
1088         nxt200x_writebytes(state, 0x13, buf, 1);
1089         buf[0] = 0x00;
1090         nxt200x_writebytes(state, 0x16, buf, 1);
1091         buf[0] = 0x04;
1092         nxt200x_writebytes(state, 0x14, buf, 1);
1093         buf[0] = 0x00;
1094         nxt200x_writebytes(state, 0x14, buf, 1);
1095         nxt200x_writebytes(state, 0x17, buf, 1);
1096         nxt200x_writebytes(state, 0x14, buf, 1);
1097         nxt200x_writebytes(state, 0x17, buf, 1);
1098
1099         return 0;
1100 }
1101
1102 static int nxt200x_init(struct dvb_frontend* fe)
1103 {
1104         struct nxt200x_state* state = fe->demodulator_priv;
1105         int ret = 0;
1106
1107         if (!state->initialised) {
1108                 switch (state->demod_chip) {
1109                         case NXT2002:
1110                                 ret = nxt2002_init(fe);
1111                                 break;
1112                         case NXT2004:
1113                                 ret = nxt2004_init(fe);
1114                                 break;
1115                         default:
1116                                 return -EINVAL;
1117                                 break;
1118                 }
1119                 state->initialised = 1;
1120         }
1121         return ret;
1122 }
1123
1124 static int nxt200x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
1125 {
1126         fesettings->min_delay_ms = 500;
1127         fesettings->step_size = 0;
1128         fesettings->max_drift = 0;
1129         return 0;
1130 }
1131
1132 static void nxt200x_release(struct dvb_frontend* fe)
1133 {
1134         struct nxt200x_state* state = fe->demodulator_priv;
1135         kfree(state);
1136 }
1137
1138 static struct dvb_frontend_ops nxt200x_ops;
1139
1140 struct dvb_frontend* nxt200x_attach(const struct nxt200x_config* config,
1141                                    struct i2c_adapter* i2c)
1142 {
1143         struct nxt200x_state* state = NULL;
1144         u8 buf [] = {0,0,0,0,0};
1145
1146         /* allocate memory for the internal state */
1147         state = kzalloc(sizeof(struct nxt200x_state), GFP_KERNEL);
1148         if (state == NULL)
1149                 goto error;
1150
1151         /* setup the state */
1152         state->config = config;
1153         state->i2c = i2c;
1154         state->initialised = 0;
1155
1156         /* read card id */
1157         nxt200x_readbytes(state, 0x00, buf, 5);
1158         dprintk("NXT info: %02X %02X %02X %02X %02X\n",
1159                 buf[0], buf[1], buf[2], buf[3], buf[4]);
1160
1161         /* set demod chip */
1162         switch (buf[0]) {
1163                 case 0x04:
1164                         state->demod_chip = NXT2002;
1165                         printk("nxt200x: NXT2002 Detected\n");
1166                         break;
1167                 case 0x05:
1168                         state->demod_chip = NXT2004;
1169                         printk("nxt200x: NXT2004 Detected\n");
1170                         break;
1171                 default:
1172                         goto error;
1173         }
1174
1175         /* make sure demod chip is supported */
1176         switch (state->demod_chip) {
1177                 case NXT2002:
1178                         if (buf[0] != 0x04) goto error;         /* device id */
1179                         if (buf[1] != 0x02) goto error;         /* fab id */
1180                         if (buf[2] != 0x11) goto error;         /* month */
1181                         if (buf[3] != 0x20) goto error;         /* year msb */
1182                         if (buf[4] != 0x00) goto error;         /* year lsb */
1183                         break;
1184                 case NXT2004:
1185                         if (buf[0] != 0x05) goto error;         /* device id */
1186                         break;
1187                 default:
1188                         goto error;
1189         }
1190
1191         /* create dvb_frontend */
1192         memcpy(&state->frontend.ops, &nxt200x_ops, sizeof(struct dvb_frontend_ops));
1193         state->frontend.demodulator_priv = state;
1194         return &state->frontend;
1195
1196 error:
1197         kfree(state);
1198         printk("Unknown/Unsupported NXT chip: %02X %02X %02X %02X %02X\n",
1199                 buf[0], buf[1], buf[2], buf[3], buf[4]);
1200         return NULL;
1201 }
1202
1203 static struct dvb_frontend_ops nxt200x_ops = {
1204
1205         .info = {
1206                 .name = "Nextwave NXT200X VSB/QAM frontend",
1207                 .type = FE_ATSC,
1208                 .frequency_min =  54000000,
1209                 .frequency_max = 860000000,
1210                 .frequency_stepsize = 166666,   /* stepsize is just a guess */
1211                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
1212                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
1213                         FE_CAN_8VSB | FE_CAN_QAM_64 | FE_CAN_QAM_256
1214         },
1215
1216         .release = nxt200x_release,
1217
1218         .init = nxt200x_init,
1219         .sleep = nxt200x_sleep,
1220
1221         .set_frontend = nxt200x_setup_frontend_parameters,
1222         .get_tune_settings = nxt200x_get_tune_settings,
1223
1224         .read_status = nxt200x_read_status,
1225         .read_ber = nxt200x_read_ber,
1226         .read_signal_strength = nxt200x_read_signal_strength,
1227         .read_snr = nxt200x_read_snr,
1228         .read_ucblocks = nxt200x_read_ucblocks,
1229 };
1230
1231 module_param(debug, int, 0644);
1232 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
1233
1234 MODULE_DESCRIPTION("NXT200X (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver");
1235 MODULE_AUTHOR("Kirk Lapray, Michael Krufky, Jean-Francois Thibert, and Taylor Jacob");
1236 MODULE_LICENSE("GPL");
1237
1238 EXPORT_SYMBOL(nxt200x_attach);
1239