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