drivers/media/dvb-frontends/or51132.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *    Support for OR51132 (pcHDTV HD-3000) - VSB/QAM
   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
  13 /*
  14  * This driver needs two external firmware files. Please copy
  15  * "dvb-fe-or51132-vsb.fw" and "dvb-fe-or51132-qam.fw" to
  16  * /usr/lib/hotplug/firmware/ or /lib/firmware/
  17  * (depending on configuration of firmware hotplug).
  18  */
  19 #define OR51132_VSB_FIRMWARE "dvb-fe-or51132-vsb.fw"
  20 #define OR51132_QAM_FIRMWARE "dvb-fe-or51132-qam.fw"
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/string.h>
  27 #include <linux/slab.h>
  28 #include <asm/byteorder.h>
  29
  30 #include <media/dvb_math.h>
  31 #include <media/dvb_frontend.h>
  32 #include "or51132.h"
  33
  34 static int debug;
  35 #define dprintk(args...) \
  36         do { \
  37                 if (debug) printk(KERN_DEBUG "or51132: " args); \
  38         } while (0)
  39
  40
  41 struct or51132_state
  42 {
  43         struct i2c_adapter* i2c;
  44
  45         /* Configuration settings */
  46         const struct or51132_config* config;
  47
  48         struct dvb_frontend frontend;
  49
  50         /* Demodulator private data */
  51         enum fe_modulation current_modulation;
  52         u32 snr; /* Result of last SNR calculation */
  53
  54         /* Tuner private data */
  55         u32 current_frequency;
  56 };
  57
  58
  59 /* Write buffer to demod */
  60 static int or51132_writebuf(struct or51132_state *state, const u8 *buf, int len)
  61 {
  62         int err;
  63         struct i2c_msg msg = { .addr = state->config->demod_address,
  64                                .flags = 0, .buf = (u8*)buf, .len = len };
  65
  66         /* msleep(20); */ /* doesn't appear to be necessary */
  67         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
  68                 printk(KERN_WARNING "or51132: I2C write (addr 0x%02x len %d) error: %d\n",
  69                        msg.addr, msg.len, err);
  70                 return -EREMOTEIO;
  71         }
  72         return 0;
  73 }
  74
  75 /* Write constant bytes, e.g. or51132_writebytes(state, 0x04, 0x42, 0x00);
  76    Less code and more efficient that loading a buffer on the stack with
  77    the bytes to send and then calling or51132_writebuf() on that. */
  78 #define or51132_writebytes(state, data...)  \
  79         ({ static const u8 _data[] = {data}; \
  80         or51132_writebuf(state, _data, sizeof(_data)); })
  81
  82 /* Read data from demod into buffer.  Returns 0 on success. */
  83 static int or51132_readbuf(struct or51132_state *state, u8 *buf, int len)
  84 {
  85         int err;
  86         struct i2c_msg msg = { .addr = state->config->demod_address,
  87                                .flags = I2C_M_RD, .buf = buf, .len = len };
  88
  89         /* msleep(20); */ /* doesn't appear to be necessary */
  90         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
  91                 printk(KERN_WARNING "or51132: I2C read (addr 0x%02x len %d) error: %d\n",
  92                        msg.addr, msg.len, err);
  93                 return -EREMOTEIO;
  94         }
  95         return 0;
  96 }
  97
  98 /* Reads a 16-bit demod register.  Returns <0 on error. */
  99 static int or51132_readreg(struct or51132_state *state, u8 reg)
 100 {
 101         u8 buf[2] = { 0x04, reg };
 102         struct i2c_msg msg[2] = {
 103                 {.addr = state->config->demod_address, .flags = 0,
 104                  .buf = buf, .len = 2 },
 105                 {.addr = state->config->demod_address, .flags = I2C_M_RD,
 106                  .buf = buf, .len = 2 }};
 107         int err;
 108
 109         if ((err = i2c_transfer(state->i2c, msg, 2)) != 2) {
 110                 printk(KERN_WARNING "or51132: I2C error reading register %d: %d\n",
 111                        reg, err);
 112                 return -EREMOTEIO;
 113         }
 114         return buf[0] | (buf[1] << 8);
 115 }
 116
 117 static int or51132_load_firmware (struct dvb_frontend* fe, const struct firmware *fw)
 118 {
 119         struct or51132_state* state = fe->demodulator_priv;
 120         static const u8 run_buf[] = {0x7F,0x01};
 121         u8 rec_buf[8];
 122         u32 firmwareAsize, firmwareBsize;
 123         int i,ret;
 124
 125         dprintk("Firmware is %zd bytes\n",fw->size);
 126
 127         /* Get size of firmware A and B */
 128         firmwareAsize = le32_to_cpu(*((__le32*)fw->data));
 129         dprintk("FirmwareA is %i bytes\n",firmwareAsize);
 130         firmwareBsize = le32_to_cpu(*((__le32*)(fw->data+4)));
 131         dprintk("FirmwareB is %i bytes\n",firmwareBsize);
 132
 133         /* Upload firmware */
 134         if ((ret = or51132_writebuf(state, &fw->data[8], firmwareAsize))) {
 135                 printk(KERN_WARNING "or51132: load_firmware error 1\n");
 136                 return ret;
 137         }
 138         if ((ret = or51132_writebuf(state, &fw->data[8+firmwareAsize],
 139                                     firmwareBsize))) {
 140                 printk(KERN_WARNING "or51132: load_firmware error 2\n");
 141                 return ret;
 142         }
 143
 144         if ((ret = or51132_writebuf(state, run_buf, 2))) {
 145                 printk(KERN_WARNING "or51132: load_firmware error 3\n");
 146                 return ret;
 147         }
 148         if ((ret = or51132_writebuf(state, run_buf, 2))) {
 149                 printk(KERN_WARNING "or51132: load_firmware error 4\n");
 150                 return ret;
 151         }
 152
 153         /* 50ms for operation to begin */
 154         msleep(50);
 155
 156         /* Read back ucode version to besure we loaded correctly and are really up and running */
 157         /* Get uCode version */
 158         if ((ret = or51132_writebytes(state, 0x10, 0x10, 0x00))) {
 159                 printk(KERN_WARNING "or51132: load_firmware error a\n");
 160                 return ret;
 161         }
 162         if ((ret = or51132_writebytes(state, 0x04, 0x17))) {
 163                 printk(KERN_WARNING "or51132: load_firmware error b\n");
 164                 return ret;
 165         }
 166         if ((ret = or51132_writebytes(state, 0x00, 0x00))) {
 167                 printk(KERN_WARNING "or51132: load_firmware error c\n");
 168                 return ret;
 169         }
 170         for (i=0;i<4;i++) {
 171                 /* Once upon a time, this command might have had something
 172                    to do with getting the firmware version, but it's
 173                    not used anymore:
 174                    {0x04,0x00,0x30,0x00,i+1} */
 175                 /* Read 8 bytes, two bytes at a time */
 176                 if ((ret = or51132_readbuf(state, &rec_buf[i*2], 2))) {
 177                         printk(KERN_WARNING
 178                                "or51132: load_firmware error d - %d\n",i);
 179                         return ret;
 180                 }
 181         }
 182
 183         printk(KERN_WARNING
 184                "or51132: Version: %02X%02X%02X%02X-%02X%02X%02X%02X (%02X%01X-%01X-%02X%01X-%01X)\n",
 185                rec_buf[1],rec_buf[0],rec_buf[3],rec_buf[2],
 186                rec_buf[5],rec_buf[4],rec_buf[7],rec_buf[6],
 187                rec_buf[3],rec_buf[2]>>4,rec_buf[2]&0x0f,
 188                rec_buf[5],rec_buf[4]>>4,rec_buf[4]&0x0f);
 189
 190         if ((ret = or51132_writebytes(state, 0x10, 0x00, 0x00))) {
 191                 printk(KERN_WARNING "or51132: load_firmware error e\n");
 192                 return ret;
 193         }
 194         return 0;
 195 };
 196
 197 static int or51132_init(struct dvb_frontend* fe)
 198 {
 199         return 0;
 200 }
 201
 202 static int or51132_read_ber(struct dvb_frontend* fe, u32* ber)
 203 {
 204         *ber = 0;
 205         return 0;
 206 }
 207
 208 static int or51132_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 209 {
 210         *ucblocks = 0;
 211         return 0;
 212 }
 213
 214 static int or51132_sleep(struct dvb_frontend* fe)
 215 {
 216         return 0;
 217 }
 218
 219 static int or51132_setmode(struct dvb_frontend* fe)
 220 {
 221         struct or51132_state* state = fe->demodulator_priv;
 222         u8 cmd_buf1[3] = {0x04, 0x01, 0x5f};
 223         u8 cmd_buf2[3] = {0x1c, 0x00, 0 };
 224
 225         dprintk("setmode %d\n",(int)state->current_modulation);
 226
 227         switch (state->current_modulation) {
 228         case VSB_8:
 229                 /* Auto CH, Auto NTSC rej, MPEGser, MPEG2tr, phase noise-high */
 230                 cmd_buf1[2] = 0x50;
 231                 /* REC MODE inv IF spectrum, Normal */
 232                 cmd_buf2[1] = 0x03;
 233                 /* Channel MODE ATSC/VSB8 */
 234                 cmd_buf2[2] = 0x06;
 235                 break;
 236         /* All QAM modes are:
 237            Auto-deinterleave; MPEGser, MPEG2tr, phase noise-high
 238            REC MODE Normal Carrier Lock */
 239         case QAM_AUTO:
 240                 /* Channel MODE Auto QAM64/256 */
 241                 cmd_buf2[2] = 0x4f;
 242                 break;
 243         case QAM_256:
 244                 /* Channel MODE QAM256 */
 245                 cmd_buf2[2] = 0x45;
 246                 break;
 247         case QAM_64:
 248                 /* Channel MODE QAM64 */
 249                 cmd_buf2[2] = 0x43;
 250                 break;
 251         default:
 252                 printk(KERN_WARNING
 253                        "or51132: setmode: Modulation set to unsupported value (%d)\n",
 254                        state->current_modulation);
 255                 return -EINVAL;
 256         }
 257
 258         /* Set Receiver 1 register */
 259         if (or51132_writebuf(state, cmd_buf1, 3)) {
 260                 printk(KERN_WARNING "or51132: set_mode error 1\n");
 261                 return -EREMOTEIO;
 262         }
 263         dprintk("set #1 to %02x\n", cmd_buf1[2]);
 264
 265         /* Set operation mode in Receiver 6 register */
 266         if (or51132_writebuf(state, cmd_buf2, 3)) {
 267                 printk(KERN_WARNING "or51132: set_mode error 2\n");
 268                 return -EREMOTEIO;
 269         }
 270         dprintk("set #6 to 0x%02x%02x\n", cmd_buf2[1], cmd_buf2[2]);
 271
 272         return 0;
 273 }
 274
 275 /* Some modulations use the same firmware.  This classifies modulations
 276    by the firmware they use. */
 277 #define MOD_FWCLASS_UNKNOWN     0
 278 #define MOD_FWCLASS_VSB         1
 279 #define MOD_FWCLASS_QAM         2
 280 static int modulation_fw_class(enum fe_modulation modulation)
 281 {
 282         switch(modulation) {
 283         case VSB_8:
 284                 return MOD_FWCLASS_VSB;
 285         case QAM_AUTO:
 286         case QAM_64:
 287         case QAM_256:
 288                 return MOD_FWCLASS_QAM;
 289         default:
 290                 return MOD_FWCLASS_UNKNOWN;
 291         }
 292 }
 293
 294 static int or51132_set_parameters(struct dvb_frontend *fe)
 295 {
 296         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 297         int ret;
 298         struct or51132_state* state = fe->demodulator_priv;
 299         const struct firmware *fw;
 300         const char *fwname;
 301         int clock_mode;
 302
 303         /* Upload new firmware only if we need a different one */
 304         if (modulation_fw_class(state->current_modulation) !=
 305             modulation_fw_class(p->modulation)) {
 306                 switch (modulation_fw_class(p->modulation)) {
 307                 case MOD_FWCLASS_VSB:
 308                         dprintk("set_parameters VSB MODE\n");
 309                         fwname = OR51132_VSB_FIRMWARE;
 310
 311                         /* Set non-punctured clock for VSB */
 312                         clock_mode = 0;
 313                         break;
 314                 case MOD_FWCLASS_QAM:
 315                         dprintk("set_parameters QAM MODE\n");
 316                         fwname = OR51132_QAM_FIRMWARE;
 317
 318                         /* Set punctured clock for QAM */
 319                         clock_mode = 1;
 320                         break;
 321                 default:
 322                         printk("or51132: Modulation type(%d) UNSUPPORTED\n",
 323                                p->modulation);
 324                         return -1;
 325                 }
 326                 printk("or51132: Waiting for firmware upload(%s)...\n",
 327                        fwname);
 328                 ret = request_firmware(&fw, fwname, state->i2c->dev.parent);
 329                 if (ret) {
 330                         printk(KERN_WARNING "or51132: No firmware uploaded(timeout or file not found?)\n");
 331                         return ret;
 332                 }
 333                 ret = or51132_load_firmware(fe, fw);
 334                 release_firmware(fw);
 335                 if (ret) {
 336                         printk(KERN_WARNING "or51132: Writing firmware to device failed!\n");
 337                         return ret;
 338                 }
 339                 printk("or51132: Firmware upload complete.\n");
 340                 state->config->set_ts_params(fe, clock_mode);
 341         }
 342         /* Change only if we are actually changing the modulation */
 343         if (state->current_modulation != p->modulation) {
 344                 state->current_modulation = p->modulation;
 345                 or51132_setmode(fe);
 346         }
 347
 348         if (fe->ops.tuner_ops.set_params) {
 349                 fe->ops.tuner_ops.set_params(fe);
 350                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 351         }
 352
 353         /* Set to current mode */
 354         or51132_setmode(fe);
 355
 356         /* Update current frequency */
 357         state->current_frequency = p->frequency;
 358         return 0;
 359 }
 360
 361 static int or51132_get_parameters(struct dvb_frontend* fe,
 362                                   struct dtv_frontend_properties *p)
 363 {
 364         struct or51132_state* state = fe->demodulator_priv;
 365         int status;
 366         int retry = 1;
 367
 368 start:
 369         /* Receiver Status */
 370         if ((status = or51132_readreg(state, 0x00)) < 0) {
 371                 printk(KERN_WARNING "or51132: get_parameters: error reading receiver status\n");
 372                 return -EREMOTEIO;
 373         }
 374         switch(status&0xff) {
 375         case 0x06:
 376                 p->modulation = VSB_8;
 377                 break;
 378         case 0x43:
 379                 p->modulation = QAM_64;
 380                 break;
 381         case 0x45:
 382                 p->modulation = QAM_256;
 383                 break;
 384         default:
 385                 if (retry--)
 386                         goto start;
 387                 printk(KERN_WARNING "or51132: unknown status 0x%02x\n",
 388                        status&0xff);
 389                 return -EREMOTEIO;
 390         }
 391
 392         /* FIXME: Read frequency from frontend, take AFC into account */
 393         p->frequency = state->current_frequency;
 394
 395         /* FIXME: How to read inversion setting? Receiver 6 register? */
 396         p->inversion = INVERSION_AUTO;
 397
 398         return 0;
 399 }
 400
 401 static int or51132_read_status(struct dvb_frontend *fe, enum fe_status *status)
 402 {
 403         struct or51132_state* state = fe->demodulator_priv;
 404         int reg;
 405
 406         /* Receiver Status */
 407         if ((reg = or51132_readreg(state, 0x00)) < 0) {
 408                 printk(KERN_WARNING "or51132: read_status: error reading receiver status: %d\n", reg);
 409                 *status = 0;
 410                 return -EREMOTEIO;
 411         }
 412         dprintk("%s: read_status %04x\n", __func__, reg);
 413
 414         if (reg & 0x0100) /* Receiver Lock */
 415                 *status = FE_HAS_SIGNAL|FE_HAS_CARRIER|FE_HAS_VITERBI|
 416                           FE_HAS_SYNC|FE_HAS_LOCK;
 417         else
 418                 *status = 0;
 419         return 0;
 420 }
 421
 422 /* Calculate SNR estimation (scaled by 2^24)
 423
 424    8-VSB SNR and QAM equations from Oren datasheets
 425
 426    For 8-VSB:
 427      SNR[dB] = 10 * log10(897152044.8282 / MSE^2 ) - K
 428
 429      Where K = 0 if NTSC rejection filter is OFF; and
 430            K = 3 if NTSC rejection filter is ON
 431
 432    For QAM64:
 433      SNR[dB] = 10 * log10(897152044.8282 / MSE^2 )
 434
 435    For QAM256:
 436      SNR[dB] = 10 * log10(907832426.314266  / MSE^2 )
 437
 438    We re-write the snr equation as:
 439      SNR * 2^24 = 10*(c - 2*intlog10(MSE))
 440    Where for QAM256, c = log10(907832426.314266) * 2^24
 441    and for 8-VSB and QAM64, c = log10(897152044.8282) * 2^24 */
 442
 443 static u32 calculate_snr(u32 mse, u32 c)
 444 {
 445         if (mse == 0) /* No signal */
 446                 return 0;
 447
 448         mse = 2*intlog10(mse);
 449         if (mse > c) {
 450                 /* Negative SNR, which is possible, but realisticly the
 451                 demod will lose lock before the signal gets this bad.  The
 452                 API only allows for unsigned values, so just return 0 */
 453                 return 0;
 454         }
 455         return 10*(c - mse);
 456 }
 457
 458 static int or51132_read_snr(struct dvb_frontend* fe, u16* snr)
 459 {
 460         struct or51132_state* state = fe->demodulator_priv;
 461         int noise, reg;
 462         u32 c, usK = 0;
 463         int retry = 1;
 464
 465 start:
 466         /* SNR after Equalizer */
 467         noise = or51132_readreg(state, 0x02);
 468         if (noise < 0) {
 469                 printk(KERN_WARNING "or51132: read_snr: error reading equalizer\n");
 470                 return -EREMOTEIO;
 471         }
 472         dprintk("read_snr noise (%d)\n", noise);
 473
 474         /* Read status, contains modulation type for QAM_AUTO and
 475            NTSC filter for VSB */
 476         reg = or51132_readreg(state, 0x00);
 477         if (reg < 0) {
 478                 printk(KERN_WARNING "or51132: read_snr: error reading receiver status\n");
 479                 return -EREMOTEIO;
 480         }
 481
 482         switch (reg&0xff) {
 483         case 0x06:
 484                 if (reg & 0x1000) usK = 3 << 24;
 485                 /* fall through */
 486         case 0x43: /* QAM64 */
 487                 c = 150204167;
 488                 break;
 489         case 0x45:
 490                 c = 150290396;
 491                 break;
 492         default:
 493                 printk(KERN_WARNING "or51132: unknown status 0x%02x\n", reg&0xff);
 494                 if (retry--) goto start;
 495                 return -EREMOTEIO;
 496         }
 497         dprintk("%s: modulation %02x, NTSC rej O%s\n", __func__,
 498                 reg&0xff, reg&0x1000?"n":"ff");
 499
 500         /* Calculate SNR using noise, c, and NTSC rejection correction */
 501         state->snr = calculate_snr(noise, c) - usK;
 502         *snr = (state->snr) >> 16;
 503
 504         dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
 505                 state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
 506
 507         return 0;
 508 }
 509
 510 static int or51132_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 511 {
 512         /* Calculate Strength from SNR up to 35dB */
 513         /* Even though the SNR can go higher than 35dB, there is some comfort */
 514         /* factor in having a range of strong signals that can show at 100%   */
 515         struct or51132_state* state = (struct or51132_state*) fe->demodulator_priv;
 516         u16 snr;
 517         int ret;
 518
 519         ret = fe->ops.read_snr(fe, &snr);
 520         if (ret != 0)
 521                 return ret;
 522         /* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
 523         /* scale the range 0 - 35*2^24 into 0 - 65535 */
 524         if (state->snr >= 8960 * 0x10000)
 525                 *strength = 0xffff;
 526         else
 527                 *strength = state->snr / 8960;
 528
 529         return 0;
 530 }
 531
 532 static int or51132_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
 533 {
 534         fe_tune_settings->min_delay_ms = 500;
 535         fe_tune_settings->step_size = 0;
 536         fe_tune_settings->max_drift = 0;
 537
 538         return 0;
 539 }
 540
 541 static void or51132_release(struct dvb_frontend* fe)
 542 {
 543         struct or51132_state* state = fe->demodulator_priv;
 544         kfree(state);
 545 }
 546
 547 static const struct dvb_frontend_ops or51132_ops;
 548
 549 struct dvb_frontend* or51132_attach(const struct or51132_config* config,
 550                                     struct i2c_adapter* i2c)
 551 {
 552         struct or51132_state* state = NULL;
 553
 554         /* Allocate memory for the internal state */
 555         state = kzalloc(sizeof(struct or51132_state), GFP_KERNEL);
 556         if (state == NULL)
 557                 return NULL;
 558
 559         /* Setup the state */
 560         state->config = config;
 561         state->i2c = i2c;
 562         state->current_frequency = -1;
 563         state->current_modulation = -1;
 564
 565         /* Create dvb_frontend */
 566         memcpy(&state->frontend.ops, &or51132_ops, sizeof(struct dvb_frontend_ops));
 567         state->frontend.demodulator_priv = state;
 568         return &state->frontend;
 569 }
 570
 571 static const struct dvb_frontend_ops or51132_ops = {
 572         .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
 573         .info = {
 574                 .name                   = "Oren OR51132 VSB/QAM Frontend",
 575                 .frequency_min_hz       =  44 * MHz,
 576                 .frequency_max_hz       = 958 * MHz,
 577                 .frequency_stepsize_hz  = 166666,
 578                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 579                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 580                         FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_QAM_AUTO |
 581                         FE_CAN_8VSB
 582         },
 583
 584         .release = or51132_release,
 585
 586         .init = or51132_init,
 587         .sleep = or51132_sleep,
 588
 589         .set_frontend = or51132_set_parameters,
 590         .get_frontend = or51132_get_parameters,
 591         .get_tune_settings = or51132_get_tune_settings,
 592
 593         .read_status = or51132_read_status,
 594         .read_ber = or51132_read_ber,
 595         .read_signal_strength = or51132_read_signal_strength,
 596         .read_snr = or51132_read_snr,
 597         .read_ucblocks = or51132_read_ucblocks,
 598 };
 599
 600 module_param(debug, int, 0644);
 601 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 602
 603 MODULE_DESCRIPTION("OR51132 ATSC [pcHDTV HD-3000] (8VSB & ITU J83 AnnexB FEC QAM64/256) Demodulator Driver");
 604 MODULE_AUTHOR("Kirk Lapray");
 605 MODULE_AUTHOR("Trent Piepho");
 606 MODULE_LICENSE("GPL");
 607
 608 EXPORT_SYMBOL(or51132_attach);