LXR linux/drivers/media/dvb-frontends/or51132.c

   1/*
   2 *    Support for OR51132 (pcHDTV HD-3000) - VSB/QAM
   3 *
   4 *
   5 *    Copyright (C) 2007 Trent Piepho <xyzzy@speakeasy.org>
   6 *
   7 *    Copyright (C) 2005 Kirk Lapray <kirk_lapray@bigfoot.com>
   8 *
   9 *    Based on code from Jack Kelliher (kelliher@xmission.com)
  10 *                           Copyright (C) 2002 & pcHDTV, inc.
  11 *
  12 *    This program is free software; you can redistribute it and/or modify
  13 *    it under the terms of the GNU General Public License as published by
  14 *    the Free Software Foundation; either version 2 of the License, or
  15 *    (at your option) any later version.
  16 *
  17 *    This program is distributed in the hope that it will be useful,
  18 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 *    GNU General Public License for more details.
  21 *
  22*/
  23
  24/*
  25 * This driver needs two external firmware files. Please copy
  26 * "dvb-fe-or51132-vsb.fw" and "dvb-fe-or51132-qam.fw" to
  27 * /usr/lib/hotplug/firmware/ or /lib/firmware/
  28 * (depending on configuration of firmware hotplug).
  29 */
  30#define OR51132_VSB_FIRMWARE "dvb-fe-or51132-vsb.fw"
  31#define OR51132_QAM_FIRMWARE "dvb-fe-or51132-qam.fw"
  32
  33#include <linux/kernel.h>
  34#include <linux/module.h>
  35#include <linux/init.h>
  36#include <linux/delay.h>
  37#include <linux/string.h>
  38#include <linux/slab.h>
  39#include <asm/byteorder.h>
  40
  41#include <media/dvb_math.h>
  42#include <media/dvb_frontend.h>
  43#include "or51132.h"
  44
  45static int debug;
  46#define dprintk(args...) \
  47        do { \
  48                if (debug) printk(KERN_DEBUG "or51132: " args); \
  49        } while (0)
  50
  51
  52struct or51132_state
  53{
  54        struct i2c_adapter* i2c;
  55
  56        /* Configuration settings */
  57        const struct or51132_config* config;
  58
  59        struct dvb_frontend frontend;
  60
  61        /* Demodulator private data */
  62        enum fe_modulation current_modulation;
  63        u32 snr; /* Result of last SNR calculation */
  64
  65        /* Tuner private data */
  66        u32 current_frequency;
  67};
  68
  69
  70/* Write buffer to demod */
  71static int or51132_writebuf(struct or51132_state *state, const u8 *buf, int len)
  72{
  73        int err;
  74        struct i2c_msg msg = { .addr = state->config->demod_address,
  75                               .flags = 0, .buf = (u8*)buf, .len = len };
  76
  77        /* msleep(20); */ /* doesn't appear to be necessary */
  78        if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
  79                printk(KERN_WARNING "or51132: I2C write (addr 0x%02x len %d) error: %d\n",
  80                       msg.addr, msg.len, err);
  81                return -EREMOTEIO;
  82        }
  83        return 0;
  84}
  85
  86/* Write constant bytes, e.g. or51132_writebytes(state, 0x04, 0x42, 0x00);
  87   Less code and more efficient that loading a buffer on the stack with
  88   the bytes to send and then calling or51132_writebuf() on that. */
  89#define or51132_writebytes(state, data...)  \
  90        ({ static const u8 _data[] = {data}; \
  91        or51132_writebuf(state, _data, sizeof(_data)); })
  92
  93/* Read data from demod into buffer.  Returns 0 on success. */
  94static int or51132_readbuf(struct or51132_state *state, u8 *buf, int len)
  95{
  96        int err;
  97        struct i2c_msg msg = { .addr = state->config->demod_address,
  98                               .flags = I2C_M_RD, .buf = buf, .len = len };
  99
 100        /* msleep(20); */ /* doesn't appear to be necessary */
 101        if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
 102                printk(KERN_WARNING "or51132: I2C read (addr 0x%02x len %d) error: %d\n",
 103                       msg.addr, msg.len, err);
 104                return -EREMOTEIO;
 105        }
 106        return 0;
 107}
 108
 109/* Reads a 16-bit demod register.  Returns <0 on error. */
 110static int or51132_readreg(struct or51132_state *state, u8 reg)
 111{
 112        u8 buf[2] = { 0x04, reg };
 113        struct i2c_msg msg[2] = {
 114                {.addr = state->config->demod_address, .flags = 0,
 115                 .buf = buf, .len = 2 },
 116                {.addr = state->config->demod_address, .flags = I2C_M_RD,
 117                 .buf = buf, .len = 2 }};
 118        int err;
 119
 120        if ((err = i2c_transfer(state->i2c, msg, 2)) != 2) {
 121                printk(KERN_WARNING "or51132: I2C error reading register %d: %d\n",
 122                       reg, err);
 123                return -EREMOTEIO;
 124        }
 125        return buf[0] | (buf[1] << 8);
 126}
 127
 128static int or51132_load_firmware (struct dvb_frontend* fe, const struct firmware *fw)
 129{
 130        struct or51132_state* state = fe->demodulator_priv;
 131        static const u8 run_buf[] = {0x7F,0x01};
 132        u8 rec_buf[8];
 133        u32 firmwareAsize, firmwareBsize;
 134        int i,ret;
 135
 136        dprintk("Firmware is %zd bytes\n",fw->size);
 137
 138        /* Get size of firmware A and B */
 139        firmwareAsize = le32_to_cpu(*((__le32*)fw->data));
 140        dprintk("FirmwareA is %i bytes\n",firmwareAsize);
 141        firmwareBsize = le32_to_cpu(*((__le32*)(fw->data+4)));
 142        dprintk("FirmwareB is %i bytes\n",firmwareBsize);
 143
 144        /* Upload firmware */
 145        if ((ret = or51132_writebuf(state, &fw->data[8], firmwareAsize))) {
 146                printk(KERN_WARNING "or51132: load_firmware error 1\n");
 147                return ret;
 148        }
 149        if ((ret = or51132_writebuf(state, &fw->data[8+firmwareAsize],
 150                                    firmwareBsize))) {
 151                printk(KERN_WARNING "or51132: load_firmware error 2\n");
 152                return ret;
 153        }
 154
 155        if ((ret = or51132_writebuf(state, run_buf, 2))) {
 156                printk(KERN_WARNING "or51132: load_firmware error 3\n");
 157                return ret;
 158        }
 159        if ((ret = or51132_writebuf(state, run_buf, 2))) {
 160                printk(KERN_WARNING "or51132: load_firmware error 4\n");
 161                return ret;
 162        }
 163
 164        /* 50ms for operation to begin */
 165        msleep(50);
 166
 167        /* Read back ucode version to besure we loaded correctly and are really up and running */
 168        /* Get uCode version */
 169        if ((ret = or51132_writebytes(state, 0x10, 0x10, 0x00))) {
 170                printk(KERN_WARNING "or51132: load_firmware error a\n");
 171                return ret;
 172        }
 173        if ((ret = or51132_writebytes(state, 0x04, 0x17))) {
 174                printk(KERN_WARNING "or51132: load_firmware error b\n");
 175                return ret;
 176        }
 177        if ((ret = or51132_writebytes(state, 0x00, 0x00))) {
 178                printk(KERN_WARNING "or51132: load_firmware error c\n");
 179                return ret;
 180        }
 181        for (i=0;i<4;i++) {
 182                /* Once upon a time, this command might have had something
 183                   to do with getting the firmware version, but it's
 184                   not used anymore:
 185                   {0x04,0x00,0x30,0x00,i+1} */
 186                /* Read 8 bytes, two bytes at a time */
 187                if ((ret = or51132_readbuf(state, &rec_buf[i*2], 2))) {
 188                        printk(KERN_WARNING
 189                               "or51132: load_firmware error d - %d\n",i);
 190                        return ret;
 191                }
 192        }
 193
 194        printk(KERN_WARNING
 195               "or51132: Version: %02X%02X%02X%02X-%02X%02X%02X%02X (%02X%01X-%01X-%02X%01X-%01X)\n",
 196               rec_buf[1],rec_buf[0],rec_buf[3],rec_buf[2],
 197               rec_buf[5],rec_buf[4],rec_buf[7],rec_buf[6],
 198               rec_buf[3],rec_buf[2]>>4,rec_buf[2]&0x0f,
 199               rec_buf[5],rec_buf[4]>>4,rec_buf[4]&0x0f);
 200
 201        if ((ret = or51132_writebytes(state, 0x10, 0x00, 0x00))) {
 202                printk(KERN_WARNING "or51132: load_firmware error e\n");
 203                return ret;
 204        }
 205        return 0;
 206};
 207
 208static int or51132_init(struct dvb_frontend* fe)
 209{
 210        return 0;
 211}
 212
 213static int or51132_read_ber(struct dvb_frontend* fe, u32* ber)
 214{
 215        *ber = 0;
 216        return 0;
 217}
 218
 219static int or51132_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 220{
 221        *ucblocks = 0;
 222        return 0;
 223}
 224
 225static int or51132_sleep(struct dvb_frontend* fe)
 226{
 227        return 0;
 228}
 229
 230static int or51132_setmode(struct dvb_frontend* fe)
 231{
 232        struct or51132_state* state = fe->demodulator_priv;
 233        u8 cmd_buf1[3] = {0x04, 0x01, 0x5f};
 234        u8 cmd_buf2[3] = {0x1c, 0x00, 0 };
 235
 236        dprintk("setmode %d\n",(int)state->current_modulation);
 237
 238        switch (state->current_modulation) {
 239        case VSB_8:
 240                /* Auto CH, Auto NTSC rej, MPEGser, MPEG2tr, phase noise-high */
 241                cmd_buf1[2] = 0x50;
 242                /* REC MODE inv IF spectrum, Normal */
 243                cmd_buf2[1] = 0x03;
 244                /* Channel MODE ATSC/VSB8 */
 245                cmd_buf2[2] = 0x06;
 246                break;
 247        /* All QAM modes are:
 248           Auto-deinterleave; MPEGser, MPEG2tr, phase noise-high
 249           REC MODE Normal Carrier Lock */
 250        case QAM_AUTO:
 251                /* Channel MODE Auto QAM64/256 */
 252                cmd_buf2[2] = 0x4f;
 253                break;
 254        case QAM_256:
 255                /* Channel MODE QAM256 */
 256                cmd_buf2[2] = 0x45;
 257                break;
 258        case QAM_64:
 259                /* Channel MODE QAM64 */
 260                cmd_buf2[2] = 0x43;
 261                break;
 262        default:
 263                printk(KERN_WARNING
 264                       "or51132: setmode: Modulation set to unsupported value (%d)\n",
 265                       state->current_modulation);
 266                return -EINVAL;
 267        }
 268
 269        /* Set Receiver 1 register */
 270        if (or51132_writebuf(state, cmd_buf1, 3)) {
 271                printk(KERN_WARNING "or51132: set_mode error 1\n");
 272                return -EREMOTEIO;
 273        }
 274        dprintk("set #1 to %02x\n", cmd_buf1[2]);
 275
 276        /* Set operation mode in Receiver 6 register */
 277        if (or51132_writebuf(state, cmd_buf2, 3)) {
 278                printk(KERN_WARNING "or51132: set_mode error 2\n");
 279                return -EREMOTEIO;
 280        }
 281        dprintk("set #6 to 0x%02x%02x\n", cmd_buf2[1], cmd_buf2[2]);
 282
 283        return 0;
 284}
 285
 286/* Some modulations use the same firmware.  This classifies modulations
 287   by the firmware they use. */
 288#define MOD_FWCLASS_UNKNOWN     0
 289#define MOD_FWCLASS_VSB         1
 290#define MOD_FWCLASS_QAM         2
 291static int modulation_fw_class(enum fe_modulation modulation)
 292{
 293        switch(modulation) {
 294        case VSB_8:
 295                return MOD_FWCLASS_VSB;
 296        case QAM_AUTO:
 297        case QAM_64:
 298        case QAM_256:
 299                return MOD_FWCLASS_QAM;
 300        default:
 301                return MOD_FWCLASS_UNKNOWN;
 302        }
 303}
 304
 305static int or51132_set_parameters(struct dvb_frontend *fe)
 306{
 307        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 308        int ret;
 309        struct or51132_state* state = fe->demodulator_priv;
 310        const struct firmware *fw;
 311        const char *fwname;
 312        int clock_mode;
 313
 314        /* Upload new firmware only if we need a different one */
 315        if (modulation_fw_class(state->current_modulation) !=
 316            modulation_fw_class(p->modulation)) {
 317                switch (modulation_fw_class(p->modulation)) {
 318                case MOD_FWCLASS_VSB:
 319                        dprintk("set_parameters VSB MODE\n");
 320                        fwname = OR51132_VSB_FIRMWARE;
 321
 322                        /* Set non-punctured clock for VSB */
 323                        clock_mode = 0;
 324                        break;
 325                case MOD_FWCLASS_QAM:
 326                        dprintk("set_parameters QAM MODE\n");
 327                        fwname = OR51132_QAM_FIRMWARE;
 328
 329                        /* Set punctured clock for QAM */
 330                        clock_mode = 1;
 331                        break;
 332                default:
 333                        printk("or51132: Modulation type(%d) UNSUPPORTED\n",
 334                               p->modulation);
 335                        return -1;
 336                }
 337                printk("or51132: Waiting for firmware upload(%s)...\n",
 338                       fwname);
 339                ret = request_firmware(&fw, fwname, state->i2c->dev.parent);
 340                if (ret) {
 341                        printk(KERN_WARNING "or51132: No firmware uploaded(timeout or file not found?)\n");
 342                        return ret;
 343                }
 344                ret = or51132_load_firmware(fe, fw);
 345                release_firmware(fw);
 346                if (ret) {
 347                        printk(KERN_WARNING "or51132: Writing firmware to device failed!\n");
 348                        return ret;
 349                }
 350                printk("or51132: Firmware upload complete.\n");
 351                state->config->set_ts_params(fe, clock_mode);
 352        }
 353        /* Change only if we are actually changing the modulation */
 354        if (state->current_modulation != p->modulation) {
 355                state->current_modulation = p->modulation;
 356                or51132_setmode(fe);
 357        }
 358
 359        if (fe->ops.tuner_ops.set_params) {
 360                fe->ops.tuner_ops.set_params(fe);
 361                if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 362        }
 363
 364        /* Set to current mode */
 365        or51132_setmode(fe);
 366
 367        /* Update current frequency */
 368        state->current_frequency = p->frequency;
 369        return 0;
 370}
 371
 372static int or51132_get_parameters(struct dvb_frontend* fe,
 373                                  struct dtv_frontend_properties *p)
 374{
 375        struct or51132_state* state = fe->demodulator_priv;
 376        int status;
 377        int retry = 1;
 378
 379start:
 380        /* Receiver Status */
 381        if ((status = or51132_readreg(state, 0x00)) < 0) {
 382                printk(KERN_WARNING "or51132: get_parameters: error reading receiver status\n");
 383                return -EREMOTEIO;
 384        }
 385        switch(status&0xff) {
 386        case 0x06:
 387                p->modulation = VSB_8;
 388                break;
 389        case 0x43:
 390                p->modulation = QAM_64;
 391                break;
 392        case 0x45:
 393                p->modulation = QAM_256;
 394                break;
 395        default:
 396                if (retry--)
 397                        goto start;
 398                printk(KERN_WARNING "or51132: unknown status 0x%02x\n",
 399                       status&0xff);
 400                return -EREMOTEIO;
 401        }
 402
 403        /* FIXME: Read frequency from frontend, take AFC into account */
 404        p->frequency = state->current_frequency;
 405
 406        /* FIXME: How to read inversion setting? Receiver 6 register? */
 407        p->inversion = INVERSION_AUTO;
 408
 409        return 0;
 410}
 411
 412static int or51132_read_status(struct dvb_frontend *fe, enum fe_status *status)
 413{
 414        struct or51132_state* state = fe->demodulator_priv;
 415        int reg;
 416
 417        /* Receiver Status */
 418        if ((reg = or51132_readreg(state, 0x00)) < 0) {
 419                printk(KERN_WARNING "or51132: read_status: error reading receiver status: %d\n", reg);
 420                *status = 0;
 421                return -EREMOTEIO;
 422        }
 423        dprintk("%s: read_status %04x\n", __func__, reg);
 424
 425        if (reg & 0x0100) /* Receiver Lock */
 426                *status = FE_HAS_SIGNAL|FE_HAS_CARRIER|FE_HAS_VITERBI|
 427                          FE_HAS_SYNC|FE_HAS_LOCK;
 428        else
 429                *status = 0;
 430        return 0;
 431}
 432
 433/* Calculate SNR estimation (scaled by 2^24)
 434
 435   8-VSB SNR and QAM equations from Oren datasheets
 436
 437   For 8-VSB:
 438     SNR[dB] = 10 * log10(897152044.8282 / MSE^2 ) - K
 439
 440     Where K = 0 if NTSC rejection filter is OFF; and
 441           K = 3 if NTSC rejection filter is ON
 442
 443   For QAM64:
 444     SNR[dB] = 10 * log10(897152044.8282 / MSE^2 )
 445
 446   For QAM256:
 447     SNR[dB] = 10 * log10(907832426.314266  / MSE^2 )
 448
 449   We re-write the snr equation as:
 450     SNR * 2^24 = 10*(c - 2*intlog10(MSE))
 451   Where for QAM256, c = log10(907832426.314266) * 2^24
 452   and for 8-VSB and QAM64, c = log10(897152044.8282) * 2^24 */
 453
 454static u32 calculate_snr(u32 mse, u32 c)
 455{
 456        if (mse == 0) /* No signal */
 457                return 0;
 458
 459        mse = 2*intlog10(mse);
 460        if (mse > c) {
 461                /* Negative SNR, which is possible, but realisticly the
 462                demod will lose lock before the signal gets this bad.  The
 463                API only allows for unsigned values, so just return 0 */
 464                return 0;
 465        }
 466        return 10*(c - mse);
 467}
 468
 469static int or51132_read_snr(struct dvb_frontend* fe, u16* snr)
 470{
 471        struct or51132_state* state = fe->demodulator_priv;
 472        int noise, reg;
 473        u32 c, usK = 0;
 474        int retry = 1;
 475
 476start:
 477        /* SNR after Equalizer */
 478        noise = or51132_readreg(state, 0x02);
 479        if (noise < 0) {
 480                printk(KERN_WARNING "or51132: read_snr: error reading equalizer\n");
 481                return -EREMOTEIO;
 482        }
 483        dprintk("read_snr noise (%d)\n", noise);
 484
 485        /* Read status, contains modulation type for QAM_AUTO and
 486           NTSC filter for VSB */
 487        reg = or51132_readreg(state, 0x00);
 488        if (reg < 0) {
 489                printk(KERN_WARNING "or51132: read_snr: error reading receiver status\n");
 490                return -EREMOTEIO;
 491        }
 492
 493        switch (reg&0xff) {
 494        case 0x06:
 495                if (reg & 0x1000) usK = 3 << 24;
 496                /* fall through */
 497        case 0x43: /* QAM64 */
 498                c = 150204167;
 499                break;
 500        case 0x45:
 501                c = 150290396;
 502                break;
 503        default:
 504                printk(KERN_WARNING "or51132: unknown status 0x%02x\n", reg&0xff);
 505                if (retry--) goto start;
 506                return -EREMOTEIO;
 507        }
 508        dprintk("%s: modulation %02x, NTSC rej O%s\n", __func__,
 509                reg&0xff, reg&0x1000?"n":"ff");
 510
 511        /* Calculate SNR using noise, c, and NTSC rejection correction */
 512        state->snr = calculate_snr(noise, c) - usK;
 513        *snr = (state->snr) >> 16;
 514
 515        dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
 516                state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
 517
 518        return 0;
 519}
 520
 521static int or51132_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 522{
 523        /* Calculate Strength from SNR up to 35dB */
 524        /* Even though the SNR can go higher than 35dB, there is some comfort */
 525        /* factor in having a range of strong signals that can show at 100%   */
 526        struct or51132_state* state = (struct or51132_state*) fe->demodulator_priv;
 527        u16 snr;
 528        int ret;
 529
 530        ret = fe->ops.read_snr(fe, &snr);
 531        if (ret != 0)
 532                return ret;
 533        /* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
 534        /* scale the range 0 - 35*2^24 into 0 - 65535 */
 535        if (state->snr >= 8960 * 0x10000)
 536                *strength = 0xffff;
 537        else
 538                *strength = state->snr / 8960;
 539
 540        return 0;
 541}
 542
 543static int or51132_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
 544{
 545        fe_tune_settings->min_delay_ms = 500;
 546        fe_tune_settings->step_size = 0;
 547        fe_tune_settings->max_drift = 0;
 548
 549        return 0;
 550}
 551
 552static void or51132_release(struct dvb_frontend* fe)
 553{
 554        struct or51132_state* state = fe->demodulator_priv;
 555        kfree(state);
 556}
 557
 558static const struct dvb_frontend_ops or51132_ops;
 559
 560struct dvb_frontend* or51132_attach(const struct or51132_config* config,
 561                                    struct i2c_adapter* i2c)
 562{
 563        struct or51132_state* state = NULL;
 564
 565        /* Allocate memory for the internal state */
 566        state = kzalloc(sizeof(struct or51132_state), GFP_KERNEL);
 567        if (state == NULL)
 568                return NULL;
 569
 570        /* Setup the state */
 571        state->config = config;
 572        state->i2c = i2c;
 573        state->current_frequency = -1;
 574        state->current_modulation = -1;
 575
 576        /* Create dvb_frontend */
 577        memcpy(&state->frontend.ops, &or51132_ops, sizeof(struct dvb_frontend_ops));
 578        state->frontend.demodulator_priv = state;
 579        return &state->frontend;
 580}
 581
 582static const struct dvb_frontend_ops or51132_ops = {
 583        .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
 584        .info = {
 585                .name                   = "Oren OR51132 VSB/QAM Frontend",
 586                .frequency_min          = 44000000,
 587                .frequency_max          = 958000000,
 588                .frequency_stepsize     = 166666,
 589                .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 590                        FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 591                        FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_QAM_AUTO |
 592                        FE_CAN_8VSB
 593        },
 594
 595        .release = or51132_release,
 596
 597        .init = or51132_init,
 598        .sleep = or51132_sleep,
 599
 600        .set_frontend = or51132_set_parameters,
 601        .get_frontend = or51132_get_parameters,
 602        .get_tune_settings = or51132_get_tune_settings,
 603
 604        .read_status = or51132_read_status,
 605        .read_ber = or51132_read_ber,
 606        .read_signal_strength = or51132_read_signal_strength,
 607        .read_snr = or51132_read_snr,
 608        .read_ucblocks = or51132_read_ucblocks,
 609};
 610
 611module_param(debug, int, 0644);
 612MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 613
 614MODULE_DESCRIPTION("OR51132 ATSC [pcHDTV HD-3000] (8VSB & ITU J83 AnnexB FEC QAM64/256) Demodulator Driver");
 615MODULE_AUTHOR("Kirk Lapray");
 616MODULE_AUTHOR("Trent Piepho");
 617MODULE_LICENSE("GPL");
 618
 619EXPORT_SYMBOL(or51132_attach);
 620