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   1 /*
   2  *    Support for OR51211 (pcHDTV HD-2000) - VSB
   3  *
   4  *    Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
   5  *
   6  *    Based on code from Jack Kelliher (kelliher@xmission.com)
   7  *                           Copyright (C) 2002 & pcHDTV, inc.
   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  * This driver needs external firmware. Please use the command
  27  * "<kerneldir>/Documentation/dvb/get_dvb_firmware or51211" to
  28  * download/extract it, and then copy it to /usr/lib/hotplug/firmware
  29  * or /lib/firmware (depending on configuration of firmware hotplug).
  30  */
  31 #define OR51211_DEFAULT_FIRMWARE "dvb-fe-or51211.fw"
  32
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/device.h>
  37 #include <linux/firmware.h>
  38 #include <linux/string.h>
  39 #include <linux/slab.h>
  40 #include <asm/byteorder.h>
  41
  42 #include "dvb_math.h"
  43 #include "dvb_frontend.h"
  44 #include "or51211.h"
  45
  46 static int debug;
  47 #define dprintk(args...) \
  48         do { \
  49                 if (debug) printk(KERN_DEBUG "or51211: " args); \
  50         } while (0)
  51
  52 static u8 run_buf[] = {0x7f,0x01};
  53 static u8 cmd_buf[] = {0x04,0x01,0x50,0x80,0x06}; // ATSC
  54
  55 struct or51211_state {
  56
  57         struct i2c_adapter* i2c;
  58
  59         /* Configuration settings */
  60         const struct or51211_config* config;
  61
  62         struct dvb_frontend frontend;
  63         struct bt878* bt;
  64
  65         /* Demodulator private data */
  66         u8 initialized:1;
  67         u32 snr; /* Result of last SNR claculation */
  68
  69         /* Tuner private data */
  70         u32 current_frequency;
  71 };
  72
  73 static int i2c_writebytes (struct or51211_state* state, u8 reg, u8 *buf,
  74                            int len)
  75 {
  76         int err;
  77         struct i2c_msg msg;
  78         msg.addr        = reg;
  79         msg.flags       = 0;
  80         msg.len         = len;
  81         msg.buf         = buf;
  82
  83         if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
  84                 printk(KERN_WARNING "or51211: i2c_writebytes error "
  85                        "(addr %02x, err == %i)\n", reg, err);
  86                 return -EREMOTEIO;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static u8 i2c_readbytes (struct or51211_state* state, u8 reg, u8* buf, int len)
  93 {
  94         int err;
  95         struct i2c_msg msg;
  96         msg.addr        = reg;
  97         msg.flags       = I2C_M_RD;
  98         msg.len         = len;
  99         msg.buf         = buf;
 100
 101         if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
 102                 printk(KERN_WARNING "or51211: i2c_readbytes error "
 103                        "(addr %02x, err == %i)\n", reg, err);
 104                 return -EREMOTEIO;
 105         }
 106
 107         return 0;
 108 }
 109
 110 static int or51211_load_firmware (struct dvb_frontend* fe,
 111                                   const struct firmware *fw)
 112 {
 113         struct or51211_state* state = fe->demodulator_priv;
 114         u8 tudata[585];
 115         int i;
 116
 117         dprintk("Firmware is %zd bytes\n",fw->size);
 118
 119         /* Get eprom data */
 120         tudata[0] = 17;
 121         if (i2c_writebytes(state,0x50,tudata,1)) {
 122                 printk(KERN_WARNING "or51211:load_firmware error eprom addr\n");
 123                 return -1;
 124         }
 125         if (i2c_readbytes(state,0x50,&tudata[145],192)) {
 126                 printk(KERN_WARNING "or51211: load_firmware error eprom\n");
 127                 return -1;
 128         }
 129
 130         /* Create firmware buffer */
 131         for (i = 0; i < 145; i++)
 132                 tudata[i] = fw->data[i];
 133
 134         for (i = 0; i < 248; i++)
 135                 tudata[i+337] = fw->data[145+i];
 136
 137         state->config->reset(fe);
 138
 139         if (i2c_writebytes(state,state->config->demod_address,tudata,585)) {
 140                 printk(KERN_WARNING "or51211: load_firmware error 1\n");
 141                 return -1;
 142         }
 143         msleep(1);
 144
 145         if (i2c_writebytes(state,state->config->demod_address,
 146                            &fw->data[393],8125)) {
 147                 printk(KERN_WARNING "or51211: load_firmware error 2\n");
 148                 return -1;
 149         }
 150         msleep(1);
 151
 152         if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 153                 printk(KERN_WARNING "or51211: load_firmware error 3\n");
 154                 return -1;
 155         }
 156
 157         /* Wait at least 5 msec */
 158         msleep(10);
 159         if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 160                 printk(KERN_WARNING "or51211: load_firmware error 4\n");
 161                 return -1;
 162         }
 163         msleep(10);
 164
 165         printk("or51211: Done.\n");
 166         return 0;
 167 };
 168
 169 static int or51211_setmode(struct dvb_frontend* fe, int mode)
 170 {
 171         struct or51211_state* state = fe->demodulator_priv;
 172         u8 rec_buf[14];
 173
 174         state->config->setmode(fe, mode);
 175
 176         if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 177                 printk(KERN_WARNING "or51211: setmode error 1\n");
 178                 return -1;
 179         }
 180
 181         /* Wait at least 5 msec */
 182         msleep(10);
 183         if (i2c_writebytes(state,state->config->demod_address,run_buf,2)) {
 184                 printk(KERN_WARNING "or51211: setmode error 2\n");
 185                 return -1;
 186         }
 187
 188         msleep(10);
 189
 190         /* Set operation mode in Receiver 1 register;
 191          * type 1:
 192          * data 0x50h  Automatic sets receiver channel conditions
 193          *             Automatic NTSC rejection filter
 194          *             Enable  MPEG serial data output
 195          *             MPEG2tr
 196          *             High tuner phase noise
 197          *             normal +/-150kHz Carrier acquisition range
 198          */
 199         if (i2c_writebytes(state,state->config->demod_address,cmd_buf,3)) {
 200                 printk(KERN_WARNING "or51211: setmode error 3\n");
 201                 return -1;
 202         }
 203
 204         rec_buf[0] = 0x04;
 205         rec_buf[1] = 0x00;
 206         rec_buf[2] = 0x03;
 207         rec_buf[3] = 0x00;
 208         msleep(20);
 209         if (i2c_writebytes(state,state->config->demod_address,rec_buf,3)) {
 210                 printk(KERN_WARNING "or51211: setmode error 5\n");
 211         }
 212         msleep(3);
 213         if (i2c_readbytes(state,state->config->demod_address,&rec_buf[10],2)) {
 214                 printk(KERN_WARNING "or51211: setmode error 6");
 215                 return -1;
 216         }
 217         dprintk("setmode rec status %02x %02x\n",rec_buf[10],rec_buf[11]);
 218
 219         return 0;
 220 }
 221
 222 static int or51211_set_parameters(struct dvb_frontend* fe,
 223                                   struct dvb_frontend_parameters *param)
 224 {
 225         struct or51211_state* state = fe->demodulator_priv;
 226
 227         /* Change only if we are actually changing the channel */
 228         if (state->current_frequency != param->frequency) {
 229                 if (fe->ops.tuner_ops.set_params) {
 230                         fe->ops.tuner_ops.set_params(fe, param);
 231                         if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 232                 }
 233
 234                 /* Set to ATSC mode */
 235                 or51211_setmode(fe,0);
 236
 237                 /* Update current frequency */
 238                 state->current_frequency = param->frequency;
 239         }
 240         return 0;
 241 }
 242
 243 static int or51211_read_status(struct dvb_frontend* fe, fe_status_t* status)
 244 {
 245         struct or51211_state* state = fe->demodulator_priv;
 246         unsigned char rec_buf[2];
 247         unsigned char snd_buf[] = {0x04,0x00,0x03,0x00};
 248         *status = 0;
 249
 250         /* Receiver Status */
 251         if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
 252                 printk(KERN_WARNING "or51132: read_status write error\n");
 253                 return -1;
 254         }
 255         msleep(3);
 256         if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
 257                 printk(KERN_WARNING "or51132: read_status read error\n");
 258                 return -1;
 259         }
 260         dprintk("read_status %x %x\n",rec_buf[0],rec_buf[1]);
 261
 262         if (rec_buf[0] &  0x01) { /* Receiver Lock */
 263                 *status |= FE_HAS_SIGNAL;
 264                 *status |= FE_HAS_CARRIER;
 265                 *status |= FE_HAS_VITERBI;
 266                 *status |= FE_HAS_SYNC;
 267                 *status |= FE_HAS_LOCK;
 268         }
 269         return 0;
 270 }
 271
 272 /* Calculate SNR estimation (scaled by 2^24)
 273
 274    8-VSB SNR equation from Oren datasheets
 275
 276    For 8-VSB:
 277      SNR[dB] = 10 * log10(219037.9454 / MSE^2 )
 278
 279    We re-write the snr equation as:
 280      SNR * 2^24 = 10*(c - 2*intlog10(MSE))
 281    Where for 8-VSB, c = log10(219037.9454) * 2^24 */
 282
 283 static u32 calculate_snr(u32 mse, u32 c)
 284 {
 285         if (mse == 0) /* No signal */
 286                 return 0;
 287
 288         mse = 2*intlog10(mse);
 289         if (mse > c) {
 290                 /* Negative SNR, which is possible, but realisticly the
 291                 demod will lose lock before the signal gets this bad.  The
 292                 API only allows for unsigned values, so just return 0 */
 293                 return 0;
 294         }
 295         return 10*(c - mse);
 296 }
 297
 298 static int or51211_read_snr(struct dvb_frontend* fe, u16* snr)
 299 {
 300         struct or51211_state* state = fe->demodulator_priv;
 301         u8 rec_buf[2];
 302         u8 snd_buf[3];
 303
 304         /* SNR after Equalizer */
 305         snd_buf[0] = 0x04;
 306         snd_buf[1] = 0x00;
 307         snd_buf[2] = 0x04;
 308
 309         if (i2c_writebytes(state,state->config->demod_address,snd_buf,3)) {
 310                 printk(KERN_WARNING "%s: error writing snr reg\n",
 311                        __FUNCTION__);
 312                 return -1;
 313         }
 314         if (i2c_readbytes(state,state->config->demod_address,rec_buf,2)) {
 315                 printk(KERN_WARNING "%s: read_status read error\n",
 316                        __FUNCTION__);
 317                 return -1;
 318         }
 319
 320         state->snr = calculate_snr(rec_buf[0], 89599047);
 321         *snr = (state->snr) >> 16;
 322
 323         dprintk("%s: noise = 0x%02x, snr = %d.%02d dB\n", __FUNCTION__, rec_buf[0],
 324                 state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
 325
 326         return 0;
 327 }
 328
 329 static int or51211_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 330 {
 331         /* Calculate Strength from SNR up to 35dB */
 332         /* Even though the SNR can go higher than 35dB, there is some comfort */
 333         /* factor in having a range of strong signals that can show at 100%   */
 334         struct or51211_state* state = (struct or51211_state*)fe->demodulator_priv;
 335         u16 snr;
 336         int ret;
 337
 338         ret = fe->ops.read_snr(fe, &snr);
 339         if (ret != 0)
 340                 return ret;
 341         /* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
 342         /* scale the range 0 - 35*2^24 into 0 - 65535 */
 343         if (state->snr >= 8960 * 0x10000)
 344                 *strength = 0xffff;
 345         else
 346                 *strength = state->snr / 8960;
 347
 348         return 0;
 349 }
 350
 351 static int or51211_read_ber(struct dvb_frontend* fe, u32* ber)
 352 {
 353         *ber = -ENOSYS;
 354         return 0;
 355 }
 356
 357 static int or51211_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 358 {
 359         *ucblocks = -ENOSYS;
 360         return 0;
 361 }
 362
 363 static int or51211_sleep(struct dvb_frontend* fe)
 364 {
 365         return 0;
 366 }
 367
 368 static int or51211_init(struct dvb_frontend* fe)
 369 {
 370         struct or51211_state* state = fe->demodulator_priv;
 371         const struct or51211_config* config = state->config;
 372         const struct firmware* fw;
 373         unsigned char get_ver_buf[] = {0x04,0x00,0x30,0x00,0x00};
 374         unsigned char rec_buf[14];
 375         int ret,i;
 376
 377         if (!state->initialized) {
 378                 /* Request the firmware, this will block until it uploads */
 379                 printk(KERN_INFO "or51211: Waiting for firmware upload "
 380                        "(%s)...\n", OR51211_DEFAULT_FIRMWARE);
 381                 ret = config->request_firmware(fe, &fw,
 382                                                OR51211_DEFAULT_FIRMWARE);
 383                 printk(KERN_INFO "or51211:Got Hotplug firmware\n");
 384                 if (ret) {
 385                         printk(KERN_WARNING "or51211: No firmware uploaded "
 386                                "(timeout or file not found?)\n");
 387                         return ret;
 388                 }
 389
 390                 ret = or51211_load_firmware(fe, fw);
 391                 release_firmware(fw);
 392                 if (ret) {
 393                         printk(KERN_WARNING "or51211: Writing firmware to "
 394                                "device failed!\n");
 395                         return ret;
 396                 }
 397                 printk(KERN_INFO "or51211: Firmware upload complete.\n");
 398
 399                 /* Set operation mode in Receiver 1 register;
 400                  * type 1:
 401                  * data 0x50h  Automatic sets receiver channel conditions
 402                  *             Automatic NTSC rejection filter
 403                  *             Enable  MPEG serial data output
 404                  *             MPEG2tr
 405                  *             High tuner phase noise
 406                  *             normal +/-150kHz Carrier acquisition range
 407                  */
 408                 if (i2c_writebytes(state,state->config->demod_address,
 409                                    cmd_buf,3)) {
 410                         printk(KERN_WARNING "or51211: Load DVR Error 5\n");
 411                         return -1;
 412                 }
 413
 414                 /* Read back ucode version to besure we loaded correctly */
 415                 /* and are really up and running */
 416                 rec_buf[0] = 0x04;
 417                 rec_buf[1] = 0x00;
 418                 rec_buf[2] = 0x03;
 419                 rec_buf[3] = 0x00;
 420                 msleep(30);
 421                 if (i2c_writebytes(state,state->config->demod_address,
 422                                    rec_buf,3)) {
 423                         printk(KERN_WARNING "or51211: Load DVR Error A\n");
 424                         return -1;
 425                 }
 426                 msleep(3);
 427                 if (i2c_readbytes(state,state->config->demod_address,
 428                                   &rec_buf[10],2)) {
 429                         printk(KERN_WARNING "or51211: Load DVR Error B\n");
 430                         return -1;
 431                 }
 432
 433                 rec_buf[0] = 0x04;
 434                 rec_buf[1] = 0x00;
 435                 rec_buf[2] = 0x01;
 436                 rec_buf[3] = 0x00;
 437                 msleep(20);
 438                 if (i2c_writebytes(state,state->config->demod_address,
 439                                    rec_buf,3)) {
 440                         printk(KERN_WARNING "or51211: Load DVR Error C\n");
 441                         return -1;
 442                 }
 443                 msleep(3);
 444                 if (i2c_readbytes(state,state->config->demod_address,
 445                                   &rec_buf[12],2)) {
 446                         printk(KERN_WARNING "or51211: Load DVR Error D\n");
 447                         return -1;
 448                 }
 449
 450                 for (i = 0; i < 8; i++)
 451                         rec_buf[i]=0xed;
 452
 453                 for (i = 0; i < 5; i++) {
 454                         msleep(30);
 455                         get_ver_buf[4] = i+1;
 456                         if (i2c_writebytes(state,state->config->demod_address,
 457                                            get_ver_buf,5)) {
 458                                 printk(KERN_WARNING "or51211:Load DVR Error 6"
 459                                        " - %d\n",i);
 460                                 return -1;
 461                         }
 462                         msleep(3);
 463
 464                         if (i2c_readbytes(state,state->config->demod_address,
 465                                           &rec_buf[i*2],2)) {
 466                                 printk(KERN_WARNING "or51211:Load DVR Error 7"
 467                                        " - %d\n",i);
 468                                 return -1;
 469                         }
 470                         /* If we didn't receive the right index, try again */
 471                         if ((int)rec_buf[i*2+1]!=i+1){
 472                           i--;
 473                         }
 474                 }
 475                 dprintk("read_fwbits %x %x %x %x %x %x %x %x %x %x\n",
 476                         rec_buf[0], rec_buf[1], rec_buf[2], rec_buf[3],
 477                         rec_buf[4], rec_buf[5], rec_buf[6], rec_buf[7],
 478                         rec_buf[8], rec_buf[9]);
 479
 480                 printk(KERN_INFO "or51211: ver TU%02x%02x%02x VSB mode %02x"
 481                        " Status %02x\n",
 482                        rec_buf[2], rec_buf[4],rec_buf[6],
 483                        rec_buf[12],rec_buf[10]);
 484
 485                 rec_buf[0] = 0x04;
 486                 rec_buf[1] = 0x00;
 487                 rec_buf[2] = 0x03;
 488                 rec_buf[3] = 0x00;
 489                 msleep(20);
 490                 if (i2c_writebytes(state,state->config->demod_address,
 491                                    rec_buf,3)) {
 492                         printk(KERN_WARNING "or51211: Load DVR Error 8\n");
 493                         return -1;
 494                 }
 495                 msleep(20);
 496                 if (i2c_readbytes(state,state->config->demod_address,
 497                                   &rec_buf[8],2)) {
 498                         printk(KERN_WARNING "or51211: Load DVR Error 9\n");
 499                         return -1;
 500                 }
 501                 state->initialized = 1;
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int or51211_get_tune_settings(struct dvb_frontend* fe,
 508                                      struct dvb_frontend_tune_settings* fesettings)
 509 {
 510         fesettings->min_delay_ms = 500;
 511         fesettings->step_size = 0;
 512         fesettings->max_drift = 0;
 513         return 0;
 514 }
 515
 516 static void or51211_release(struct dvb_frontend* fe)
 517 {
 518         struct or51211_state* state = fe->demodulator_priv;
 519         state->config->sleep(fe);
 520         kfree(state);
 521 }
 522
 523 static struct dvb_frontend_ops or51211_ops;
 524
 525 struct dvb_frontend* or51211_attach(const struct or51211_config* config,
 526                                     struct i2c_adapter* i2c)
 527 {
 528         struct or51211_state* state = NULL;
 529
 530         /* Allocate memory for the internal state */
 531         state = kmalloc(sizeof(struct or51211_state), GFP_KERNEL);
 532         if (state == NULL)
 533                 goto error;
 534
 535         /* Setup the state */
 536         state->config = config;
 537         state->i2c = i2c;
 538         state->initialized = 0;
 539         state->current_frequency = 0;
 540
 541         /* Create dvb_frontend */
 542         memcpy(&state->frontend.ops, &or51211_ops, sizeof(struct dvb_frontend_ops));
 543         state->frontend.demodulator_priv = state;
 544         return &state->frontend;
 545
 546 error:
 547         kfree(state);
 548         return NULL;
 549 }
 550
 551 static struct dvb_frontend_ops or51211_ops = {
 552
 553         .info = {
 554                 .name               = "Oren OR51211 VSB Frontend",
 555                 .type               = FE_ATSC,
 556                 .frequency_min      = 44000000,
 557                 .frequency_max      = 958000000,
 558                 .frequency_stepsize = 166666,
 559                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 560                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 561                         FE_CAN_8VSB
 562         },
 563
 564         .release = or51211_release,
 565
 566         .init = or51211_init,
 567         .sleep = or51211_sleep,
 568
 569         .set_frontend = or51211_set_parameters,
 570         .get_tune_settings = or51211_get_tune_settings,
 571
 572         .read_status = or51211_read_status,
 573         .read_ber = or51211_read_ber,
 574         .read_signal_strength = or51211_read_signal_strength,
 575         .read_snr = or51211_read_snr,
 576         .read_ucblocks = or51211_read_ucblocks,
 577 };
 578
 579 module_param(debug, int, 0644);
 580 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 581
 582 MODULE_DESCRIPTION("Oren OR51211 VSB [pcHDTV HD-2000] Demodulator Driver");
 583 MODULE_AUTHOR("Kirk Lapray");
 584 MODULE_LICENSE("GPL");
 585
 586 EXPORT_SYMBOL(or51211_attach);
 587