drivers/media/dvb/frontends/lgs8gxx.c

   1 /*
   2  *    Support for Legend Silicon DMB-TH demodulator
   3  *    LGS8913, LGS8GL5
   4  *    experimental support LGS8G42, LGS8G52
   5  *
   6  *    Copyright (C) 2007,2008 David T.L. Wong <davidtlwong@gmail.com>
   7  *    Copyright (C) 2008 Sirius International (Hong Kong) Limited
   8  *    Timothy Lee <timothy.lee@siriushk.com> (for initial work on LGS8GL5)
   9  *
  10  *    This program is free software; you can redistribute it and/or modify
  11  *    it under the terms of the GNU General Public License as published by
  12  *    the Free Software Foundation; either version 2 of the License, or
  13  *    (at your option) any later version.
  14  *
  15  *    This program is distributed in the hope that it will be useful,
  16  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *    GNU General Public License for more details.
  19  *
  20  *    You should have received a copy of the GNU General Public License
  21  *    along with this program; if not, write to the Free Software
  22  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  */
  25
  26 #include <asm/div64.h>
  27
  28 #include "dvb_frontend.h"
  29
  30 #include "lgs8gxx.h"
  31 #include "lgs8gxx_priv.h"
  32
  33 #define dprintk(args...) \
  34         do { \
  35                 if (debug) \
  36                         printk(KERN_DEBUG "lgs8gxx: " args); \
  37         } while (0)
  38
  39 static int debug;
  40 static int fake_signal_str = 1;
  41
  42 module_param(debug, int, 0644);
  43 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
  44
  45 module_param(fake_signal_str, int, 0644);
  46 MODULE_PARM_DESC(fake_signal_str, "fake signal strength for LGS8913."
  47 "Signal strength calculation is slow.(default:on).");
  48
  49 /* LGS8GXX internal helper functions */
  50
  51 static int lgs8gxx_write_reg(struct lgs8gxx_state *priv, u8 reg, u8 data)
  52 {
  53         int ret;
  54         u8 buf[] = { reg, data };
  55         struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 };
  56
  57         msg.addr = priv->config->demod_address;
  58         if (reg >= 0xC0)
  59                 msg.addr += 0x02;
  60
  61         if (debug >= 2)
  62                 printk(KERN_DEBUG "%s: reg=0x%02X, data=0x%02X\n",
  63                         __func__, reg, data);
  64
  65         ret = i2c_transfer(priv->i2c, &msg, 1);
  66
  67         if (ret != 1)
  68                 dprintk(KERN_DEBUG "%s: error reg=0x%x, data=0x%x, ret=%i\n",
  69                         __func__, reg, data, ret);
  70
  71         return (ret != 1) ? -1 : 0;
  72 }
  73
  74 static int lgs8gxx_read_reg(struct lgs8gxx_state *priv, u8 reg, u8 *p_data)
  75 {
  76         int ret;
  77         u8 dev_addr;
  78
  79         u8 b0[] = { reg };
  80         u8 b1[] = { 0 };
  81         struct i2c_msg msg[] = {
  82                 { .flags = 0, .buf = b0, .len = 1 },
  83                 { .flags = I2C_M_RD, .buf = b1, .len = 1 },
  84         };
  85
  86         dev_addr = priv->config->demod_address;
  87         if (reg >= 0xC0)
  88                 dev_addr += 0x02;
  89         msg[1].addr =  msg[0].addr = dev_addr;
  90
  91         ret = i2c_transfer(priv->i2c, msg, 2);
  92         if (ret != 2) {
  93                 dprintk(KERN_DEBUG "%s: error reg=0x%x, ret=%i\n",
  94                         __func__, reg, ret);
  95                 return -1;
  96         }
  97
  98         *p_data = b1[0];
  99         if (debug >= 2)
 100                 printk(KERN_DEBUG "%s: reg=0x%02X, data=0x%02X\n",
 101                         __func__, reg, b1[0]);
 102         return 0;
 103 }
 104
 105 static int lgs8gxx_soft_reset(struct lgs8gxx_state *priv)
 106 {
 107         lgs8gxx_write_reg(priv, 0x02, 0x00);
 108         msleep(1);
 109         lgs8gxx_write_reg(priv, 0x02, 0x01);
 110         msleep(100);
 111
 112         return 0;
 113 }
 114
 115 static int lgs8gxx_set_ad_mode(struct lgs8gxx_state *priv)
 116 {
 117         const struct lgs8gxx_config *config = priv->config;
 118         u8 if_conf;
 119
 120         if_conf = 0x10; /* AGC output on; */
 121
 122         if_conf |=
 123                 ((config->ext_adc) ? 0x80 : 0x00) |
 124                 ((config->if_neg_center) ? 0x04 : 0x00) |
 125                 ((config->if_freq == 0) ? 0x08 : 0x00) | /* Baseband */
 126                 ((config->ext_adc && config->adc_signed) ? 0x02 : 0x00) |
 127                 ((config->ext_adc && config->if_neg_edge) ? 0x01 : 0x00);
 128
 129         if (config->ext_adc &&
 130                 (config->prod == LGS8GXX_PROD_LGS8G52)) {
 131                 lgs8gxx_write_reg(priv, 0xBA, 0x40);
 132         }
 133
 134         lgs8gxx_write_reg(priv, 0x07, if_conf);
 135
 136         return 0;
 137 }
 138
 139 static int lgs8gxx_set_if_freq(struct lgs8gxx_state *priv, u32 freq /*in kHz*/)
 140 {
 141         u64 val;
 142         u32 v32;
 143         u32 if_clk;
 144
 145         if_clk = priv->config->if_clk_freq;
 146
 147         val = freq;
 148         if (freq != 0) {
 149                 val *= (u64)1 << 32;
 150                 if (if_clk != 0)
 151                         do_div(val, if_clk);
 152                 v32 = val & 0xFFFFFFFF;
 153                 dprintk("Set IF Freq to %dkHz\n", freq);
 154         } else {
 155                 v32 = 0;
 156                 dprintk("Set IF Freq to baseband\n");
 157         }
 158         dprintk("AFC_INIT_FREQ = 0x%08X\n", v32);
 159
 160         lgs8gxx_write_reg(priv, 0x09, 0xFF & (v32));
 161         lgs8gxx_write_reg(priv, 0x0A, 0xFF & (v32 >> 8));
 162         lgs8gxx_write_reg(priv, 0x0B, 0xFF & (v32 >> 16));
 163         lgs8gxx_write_reg(priv, 0x0C, 0xFF & (v32 >> 24));
 164
 165         return 0;
 166 }
 167
 168 static int lgs8gxx_set_mode_auto(struct lgs8gxx_state *priv)
 169 {
 170         u8 t;
 171
 172         if (priv->config->prod == LGS8GXX_PROD_LGS8913)
 173                 lgs8gxx_write_reg(priv, 0xC6, 0x01);
 174
 175         lgs8gxx_read_reg(priv, 0x7E, &t);
 176         lgs8gxx_write_reg(priv, 0x7E, t | 0x01);
 177
 178         /* clear FEC self reset */
 179         lgs8gxx_read_reg(priv, 0xC5, &t);
 180         lgs8gxx_write_reg(priv, 0xC5, t & 0xE0);
 181
 182         if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
 183                 /* FEC auto detect */
 184                 lgs8gxx_write_reg(priv, 0xC1, 0x03);
 185
 186                 lgs8gxx_read_reg(priv, 0x7C, &t);
 187                 t = (t & 0x8C) | 0x03;
 188                 lgs8gxx_write_reg(priv, 0x7C, t);
 189         }
 190
 191
 192         if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
 193                 /* BER test mode */
 194                 lgs8gxx_read_reg(priv, 0xC3, &t);
 195                 t = (t & 0xEF) |  0x10;
 196                 lgs8gxx_write_reg(priv, 0xC3, t);
 197         }
 198
 199         if (priv->config->prod == LGS8GXX_PROD_LGS8G52)
 200                 lgs8gxx_write_reg(priv, 0xD9, 0x40);
 201
 202         return 0;
 203 }
 204
 205 static int lgs8gxx_set_mode_manual(struct lgs8gxx_state *priv)
 206 {
 207         int ret = 0;
 208         u8 t;
 209
 210         /* turn off auto-detect; manual settings */
 211         lgs8gxx_write_reg(priv, 0x7E, 0);
 212         if (priv->config->prod == LGS8GXX_PROD_LGS8913)
 213                 lgs8gxx_write_reg(priv, 0xC1, 0);
 214
 215         ret = lgs8gxx_read_reg(priv, 0xC5, &t);
 216         t = (t & 0xE0) | 0x06;
 217         lgs8gxx_write_reg(priv, 0xC5, t);
 218
 219         lgs8gxx_soft_reset(priv);
 220
 221         return 0;
 222 }
 223
 224 static int lgs8gxx_is_locked(struct lgs8gxx_state *priv, u8 *locked)
 225 {
 226         int ret = 0;
 227         u8 t;
 228
 229         ret = lgs8gxx_read_reg(priv, 0x4B, &t);
 230         if (ret != 0)
 231                 return ret;
 232
 233         *locked = ((t & 0xC0) == 0xC0) ? 1 : 0;
 234         return 0;
 235 }
 236
 237 static int lgs8gxx_is_autodetect_finished(struct lgs8gxx_state *priv,
 238                                           u8 *finished)
 239 {
 240         int ret = 0;
 241         u8 t;
 242
 243         ret = lgs8gxx_read_reg(priv, 0xA4, &t);
 244         if (ret != 0)
 245                 return ret;
 246
 247         *finished = ((t & 0x3) == 0x1) ? 1 : 0;
 248
 249         return 0;
 250 }
 251
 252 static int lgs8gxx_autolock_gi(struct lgs8gxx_state *priv, u8 gi, u8 *locked)
 253 {
 254         int err;
 255         u8 ad_fini = 0;
 256
 257         if (gi == GI_945)
 258                 dprintk("try GI 945\n");
 259         else if (gi == GI_595)
 260                 dprintk("try GI 595\n");
 261         else if (gi == GI_420)
 262                 dprintk("try GI 420\n");
 263         lgs8gxx_write_reg(priv, 0x04, gi);
 264         lgs8gxx_soft_reset(priv);
 265         msleep(50);
 266         err = lgs8gxx_is_autodetect_finished(priv, &ad_fini);
 267         if (err != 0)
 268                 return err;
 269         if (ad_fini) {
 270                 err = lgs8gxx_is_locked(priv, locked);
 271                 if (err != 0)
 272                         return err;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static int lgs8gxx_auto_detect(struct lgs8gxx_state *priv,
 279                                u8 *detected_param, u8 *gi)
 280 {
 281         int i, j;
 282         int err = 0;
 283         u8 locked = 0, tmp_gi;
 284
 285         dprintk("%s\n", __func__);
 286
 287         lgs8gxx_set_mode_auto(priv);
 288         /* Guard Interval */
 289         lgs8gxx_write_reg(priv, 0x03, 00);
 290
 291         for (i = 0; i < 2; i++) {
 292                 for (j = 0; j < 2; j++) {
 293                         tmp_gi = GI_945;
 294                         err = lgs8gxx_autolock_gi(priv, GI_945, &locked);
 295                         if (err)
 296                                 goto out;
 297                         if (locked)
 298                                 goto locked;
 299                 }
 300                 for (j = 0; j < 2; j++) {
 301                         tmp_gi = GI_420;
 302                         err = lgs8gxx_autolock_gi(priv, GI_420, &locked);
 303                         if (err)
 304                                 goto out;
 305                         if (locked)
 306                                 goto locked;
 307                 }
 308                 tmp_gi = GI_595;
 309                 err = lgs8gxx_autolock_gi(priv, GI_595, &locked);
 310                 if (err)
 311                         goto out;
 312                 if (locked)
 313                         goto locked;
 314         }
 315
 316 locked:
 317         if ((err == 0) && (locked == 1)) {
 318                 u8 t;
 319
 320                 lgs8gxx_read_reg(priv, 0xA2, &t);
 321                 *detected_param = t;
 322
 323                 if (tmp_gi == GI_945)
 324                         dprintk("GI 945 locked\n");
 325                 else if (tmp_gi == GI_595)
 326                         dprintk("GI 595 locked\n");
 327                 else if (tmp_gi == GI_420)
 328                         dprintk("GI 420 locked\n");
 329                 *gi = tmp_gi;
 330         }
 331         if (!locked)
 332                 err = -1;
 333
 334 out:
 335         return err;
 336 }
 337
 338 static void lgs8gxx_auto_lock(struct lgs8gxx_state *priv)
 339 {
 340         s8 err;
 341         u8 gi = 0x2;
 342         u8 detected_param = 0;
 343
 344         err = lgs8gxx_auto_detect(priv, &detected_param, &gi);
 345
 346         if (err != 0) {
 347                 dprintk("lgs8gxx_auto_detect failed\n");
 348         }
 349
 350         /* Apply detected parameters */
 351         if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
 352                 u8 inter_leave_len = detected_param & TIM_MASK ;
 353                 inter_leave_len = (inter_leave_len == TIM_LONG) ? 0x60 : 0x40;
 354                 detected_param &= CF_MASK | SC_MASK  | LGS_FEC_MASK;
 355                 detected_param |= inter_leave_len;
 356         }
 357         lgs8gxx_write_reg(priv, 0x7D, detected_param);
 358         if (priv->config->prod == LGS8GXX_PROD_LGS8913)
 359                 lgs8gxx_write_reg(priv, 0xC0, detected_param);
 360         /* lgs8gxx_soft_reset(priv); */
 361
 362         /* Enter manual mode */
 363         lgs8gxx_set_mode_manual(priv);
 364
 365         switch (gi) {
 366         case GI_945:
 367                 priv->curr_gi = 945; break;
 368         case GI_595:
 369                 priv->curr_gi = 595; break;
 370         case GI_420:
 371                 priv->curr_gi = 420; break;
 372         default:
 373                 priv->curr_gi = 945; break;
 374         }
 375 }
 376
 377 static int lgs8gxx_set_mpeg_mode(struct lgs8gxx_state *priv,
 378         u8 serial, u8 clk_pol, u8 clk_gated)
 379 {
 380         int ret = 0;
 381         u8 t;
 382
 383         ret = lgs8gxx_read_reg(priv, 0xC2, &t);
 384         if (ret != 0)
 385                 return ret;
 386
 387         t &= 0xF8;
 388         t |= serial ? TS_SERIAL : TS_PARALLEL;
 389         t |= clk_pol ? TS_CLK_INVERTED : TS_CLK_NORMAL;
 390         t |= clk_gated ? TS_CLK_GATED : TS_CLK_FREERUN;
 391
 392         ret = lgs8gxx_write_reg(priv, 0xC2, t);
 393         if (ret != 0)
 394                 return ret;
 395
 396         return 0;
 397 }
 398
 399
 400 /* LGS8913 demod frontend functions */
 401
 402 static int lgs8913_init(struct lgs8gxx_state *priv)
 403 {
 404         u8 t;
 405
 406         /* LGS8913 specific */
 407         lgs8gxx_write_reg(priv, 0xc1, 0x3);
 408
 409         lgs8gxx_read_reg(priv, 0x7c, &t);
 410         lgs8gxx_write_reg(priv, 0x7c, (t&0x8c) | 0x3);
 411
 412         /* LGS8913 specific */
 413         lgs8gxx_read_reg(priv, 0xc3, &t);
 414         lgs8gxx_write_reg(priv, 0xc3, t&0x10);
 415
 416
 417         return 0;
 418 }
 419
 420 static int lgs8gxx_init(struct dvb_frontend *fe)
 421 {
 422         struct lgs8gxx_state *priv =
 423                 (struct lgs8gxx_state *)fe->demodulator_priv;
 424         const struct lgs8gxx_config *config = priv->config;
 425         u8 data = 0;
 426         s8 err;
 427         dprintk("%s\n", __func__);
 428
 429         lgs8gxx_read_reg(priv, 0, &data);
 430         dprintk("reg 0 = 0x%02X\n", data);
 431
 432         /* Setup MPEG output format */
 433         err = lgs8gxx_set_mpeg_mode(priv, config->serial_ts,
 434                                     config->ts_clk_pol,
 435                                     config->ts_clk_gated);
 436         if (err != 0)
 437                 return -EIO;
 438
 439         if (config->prod == LGS8GXX_PROD_LGS8913)
 440                 lgs8913_init(priv);
 441         lgs8gxx_set_if_freq(priv, priv->config->if_freq);
 442         if (config->prod != LGS8GXX_PROD_LGS8913)
 443                 lgs8gxx_set_ad_mode(priv);
 444
 445         return 0;
 446 }
 447
 448 static void lgs8gxx_release(struct dvb_frontend *fe)
 449 {
 450         struct lgs8gxx_state *state = fe->demodulator_priv;
 451         dprintk("%s\n", __func__);
 452
 453         kfree(state);
 454 }
 455
 456
 457 static int lgs8gxx_write(struct dvb_frontend *fe, u8 *buf, int len)
 458 {
 459         struct lgs8gxx_state *priv = fe->demodulator_priv;
 460
 461         if (len != 2)
 462                 return -EINVAL;
 463
 464         return lgs8gxx_write_reg(priv, buf[0], buf[1]);
 465 }
 466
 467 static int lgs8gxx_set_fe(struct dvb_frontend *fe,
 468                           struct dvb_frontend_parameters *fe_params)
 469 {
 470         struct lgs8gxx_state *priv = fe->demodulator_priv;
 471
 472         dprintk("%s\n", __func__);
 473
 474         /* set frequency */
 475         if (fe->ops.tuner_ops.set_params) {
 476                 fe->ops.tuner_ops.set_params(fe, fe_params);
 477                 if (fe->ops.i2c_gate_ctrl)
 478                         fe->ops.i2c_gate_ctrl(fe, 0);
 479         }
 480
 481         /* start auto lock */
 482         lgs8gxx_auto_lock(priv);
 483
 484         msleep(10);
 485
 486         return 0;
 487 }
 488
 489 static int lgs8gxx_get_fe(struct dvb_frontend *fe,
 490                           struct dvb_frontend_parameters *fe_params)
 491 {
 492         struct lgs8gxx_state *priv = fe->demodulator_priv;
 493         u8 t;
 494
 495         dprintk("%s\n", __func__);
 496
 497         /* TODO: get real readings from device */
 498         /* inversion status */
 499         fe_params->inversion = INVERSION_OFF;
 500
 501         /* bandwidth */
 502         fe_params->u.ofdm.bandwidth = BANDWIDTH_8_MHZ;
 503
 504
 505         lgs8gxx_read_reg(priv, 0x7D, &t);
 506         fe_params->u.ofdm.code_rate_HP = FEC_AUTO;
 507         fe_params->u.ofdm.code_rate_LP = FEC_AUTO;
 508
 509         /* constellation */
 510         switch (t & SC_MASK) {
 511         case SC_QAM64:
 512                 fe_params->u.ofdm.constellation = QAM_64;
 513                 break;
 514         case SC_QAM32:
 515                 fe_params->u.ofdm.constellation = QAM_32;
 516                 break;
 517         case SC_QAM16:
 518                 fe_params->u.ofdm.constellation = QAM_16;
 519                 break;
 520         case SC_QAM4:
 521         case SC_QAM4NR:
 522                 fe_params->u.ofdm.constellation = QPSK;
 523                 break;
 524         default:
 525                 fe_params->u.ofdm.constellation = QAM_64;
 526         }
 527
 528         /* transmission mode */
 529         fe_params->u.ofdm.transmission_mode = TRANSMISSION_MODE_AUTO;
 530
 531         /* guard interval */
 532         fe_params->u.ofdm.guard_interval = GUARD_INTERVAL_AUTO;
 533
 534         /* hierarchy */
 535         fe_params->u.ofdm.hierarchy_information = HIERARCHY_NONE;
 536
 537         return 0;
 538 }
 539
 540 static
 541 int lgs8gxx_get_tune_settings(struct dvb_frontend *fe,
 542                               struct dvb_frontend_tune_settings *fesettings)
 543 {
 544         /* FIXME: copy from tda1004x.c */
 545         fesettings->min_delay_ms = 800;
 546         fesettings->step_size = 0;
 547         fesettings->max_drift = 0;
 548         return 0;
 549 }
 550
 551 static int lgs8gxx_read_status(struct dvb_frontend *fe, fe_status_t *fe_status)
 552 {
 553         struct lgs8gxx_state *priv = fe->demodulator_priv;
 554         s8 ret;
 555         u8 t;
 556
 557         dprintk("%s\n", __func__);
 558
 559         ret = lgs8gxx_read_reg(priv, 0x4B, &t);
 560         if (ret != 0)
 561                 return -EIO;
 562
 563         dprintk("Reg 0x4B: 0x%02X\n", t);
 564
 565         *fe_status = 0;
 566         if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
 567                 if ((t & 0x40) == 0x40)
 568                         *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
 569                 if ((t & 0x80) == 0x80)
 570                         *fe_status |= FE_HAS_VITERBI | FE_HAS_SYNC |
 571                                 FE_HAS_LOCK;
 572         } else {
 573                 if ((t & 0x80) == 0x80)
 574                         *fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
 575                                 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
 576         }
 577
 578         /* success */
 579         dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
 580         return 0;
 581 }
 582
 583 static int lgs8gxx_read_signal_agc(struct lgs8gxx_state *priv, u16 *signal)
 584 {
 585         u16 v;
 586         u8 agc_lvl[2], cat;
 587
 588         dprintk("%s()\n", __func__);
 589         lgs8gxx_read_reg(priv, 0x3F, &agc_lvl[0]);
 590         lgs8gxx_read_reg(priv, 0x3E, &agc_lvl[1]);
 591
 592         v = agc_lvl[0];
 593         v <<= 8;
 594         v |= agc_lvl[1];
 595
 596         dprintk("agc_lvl: 0x%04X\n", v);
 597
 598         if (v < 0x100)
 599                 cat = 0;
 600         else if (v < 0x190)
 601                 cat = 5;
 602         else if (v < 0x2A8)
 603                 cat = 4;
 604         else if (v < 0x381)
 605                 cat = 3;
 606         else if (v < 0x400)
 607                 cat = 2;
 608         else if (v == 0x400)
 609                 cat = 1;
 610         else
 611                 cat = 0;
 612
 613         *signal = cat * 65535 / 5;
 614
 615         return 0;
 616 }
 617
 618 static int lgs8913_read_signal_strength(struct lgs8gxx_state *priv, u16 *signal)
 619 {
 620         u8 t; s8 ret;
 621         s16 max_strength = 0;
 622         u8 str;
 623         u16 i, gi = priv->curr_gi;
 624
 625         dprintk("%s\n", __func__);
 626
 627         ret = lgs8gxx_read_reg(priv, 0x4B, &t);
 628         if (ret != 0)
 629                 return -EIO;
 630
 631         if (fake_signal_str) {
 632                 if ((t & 0xC0) == 0xC0) {
 633                         dprintk("Fake signal strength\n");
 634                         *signal = 0x7FFF;
 635                 } else
 636                         *signal = 0;
 637                 return 0;
 638         }
 639
 640         dprintk("gi = %d\n", gi);
 641         for (i = 0; i < gi; i++) {
 642
 643                 if ((i & 0xFF) == 0)
 644                         lgs8gxx_write_reg(priv, 0x84, 0x03 & (i >> 8));
 645                 lgs8gxx_write_reg(priv, 0x83, i & 0xFF);
 646
 647                 lgs8gxx_read_reg(priv, 0x94, &str);
 648                 if (max_strength < str)
 649                         max_strength = str;
 650         }
 651
 652         *signal = max_strength;
 653         dprintk("%s: signal=0x%02X\n", __func__, *signal);
 654
 655         lgs8gxx_read_reg(priv, 0x95, &t);
 656         dprintk("%s: AVG Noise=0x%02X\n", __func__, t);
 657
 658         return 0;
 659 }
 660
 661 static int lgs8gxx_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
 662 {
 663         struct lgs8gxx_state *priv = fe->demodulator_priv;
 664
 665         if (priv->config->prod == LGS8GXX_PROD_LGS8913)
 666                 return lgs8913_read_signal_strength(priv, signal);
 667         else
 668                 return lgs8gxx_read_signal_agc(priv, signal);
 669 }
 670
 671 static int lgs8gxx_read_snr(struct dvb_frontend *fe, u16 *snr)
 672 {
 673         struct lgs8gxx_state *priv = fe->demodulator_priv;
 674         u8 t;
 675         *snr = 0;
 676
 677         lgs8gxx_read_reg(priv, 0x95, &t);
 678         dprintk("AVG Noise=0x%02X\n", t);
 679         *snr = 256 - t;
 680         *snr <<= 8;
 681         dprintk("snr=0x%x\n", *snr);
 682
 683         return 0;
 684 }
 685
 686 static int lgs8gxx_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 687 {
 688         *ucblocks = 0;
 689         dprintk("%s: ucblocks=0x%x\n", __func__, *ucblocks);
 690         return 0;
 691 }
 692
 693 static int lgs8gxx_read_ber(struct dvb_frontend *fe, u32 *ber)
 694 {
 695         struct lgs8gxx_state *priv = fe->demodulator_priv;
 696         u8 r0, r1, r2, r3;
 697         u32 total_cnt, err_cnt;
 698
 699         dprintk("%s\n", __func__);
 700
 701         lgs8gxx_write_reg(priv, 0xc6, 0x01);
 702         lgs8gxx_write_reg(priv, 0xc6, 0x41);
 703         lgs8gxx_write_reg(priv, 0xc6, 0x01);
 704
 705         msleep(200);
 706
 707         lgs8gxx_write_reg(priv, 0xc6, 0x81);
 708         lgs8gxx_read_reg(priv, 0xd0, &r0);
 709         lgs8gxx_read_reg(priv, 0xd1, &r1);
 710         lgs8gxx_read_reg(priv, 0xd2, &r2);
 711         lgs8gxx_read_reg(priv, 0xd3, &r3);
 712         total_cnt = (r3 << 24) | (r2 << 16) | (r1 << 8) | (r0);
 713         lgs8gxx_read_reg(priv, 0xd4, &r0);
 714         lgs8gxx_read_reg(priv, 0xd5, &r1);
 715         lgs8gxx_read_reg(priv, 0xd6, &r2);
 716         lgs8gxx_read_reg(priv, 0xd7, &r3);
 717         err_cnt = (r3 << 24) | (r2 << 16) | (r1 << 8) | (r0);
 718         dprintk("error=%d total=%d\n", err_cnt, total_cnt);
 719
 720         if (total_cnt == 0)
 721                 *ber = 0;
 722         else
 723                 *ber = err_cnt * 100 / total_cnt;
 724
 725         dprintk("%s: ber=0x%x\n", __func__, *ber);
 726         return 0;
 727 }
 728
 729 static int lgs8gxx_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 730 {
 731         struct lgs8gxx_state *priv = fe->demodulator_priv;
 732
 733         if (priv->config->tuner_address == 0)
 734                 return 0;
 735         if (enable) {
 736                 u8 v = 0x80 | priv->config->tuner_address;
 737                 return lgs8gxx_write_reg(priv, 0x01, v);
 738         }
 739         return lgs8gxx_write_reg(priv, 0x01, 0);
 740 }
 741
 742 static struct dvb_frontend_ops lgs8gxx_ops = {
 743         .info = {
 744                 .name = "Legend Silicon LGS8913/LGS8GXX DMB-TH",
 745                 .type = FE_OFDM,
 746                 .frequency_min = 474000000,
 747                 .frequency_max = 858000000,
 748                 .frequency_stepsize = 10000,
 749                 .caps =
 750                         FE_CAN_FEC_AUTO |
 751                         FE_CAN_QAM_AUTO |
 752                         FE_CAN_TRANSMISSION_MODE_AUTO |
 753                         FE_CAN_GUARD_INTERVAL_AUTO
 754         },
 755
 756         .release = lgs8gxx_release,
 757
 758         .init = lgs8gxx_init,
 759         .write = lgs8gxx_write,
 760         .i2c_gate_ctrl = lgs8gxx_i2c_gate_ctrl,
 761
 762         .set_frontend = lgs8gxx_set_fe,
 763         .get_frontend = lgs8gxx_get_fe,
 764         .get_tune_settings = lgs8gxx_get_tune_settings,
 765
 766         .read_status = lgs8gxx_read_status,
 767         .read_ber = lgs8gxx_read_ber,
 768         .read_signal_strength = lgs8gxx_read_signal_strength,
 769         .read_snr = lgs8gxx_read_snr,
 770         .read_ucblocks = lgs8gxx_read_ucblocks,
 771 };
 772
 773 struct dvb_frontend *lgs8gxx_attach(const struct lgs8gxx_config *config,
 774         struct i2c_adapter *i2c)
 775 {
 776         struct lgs8gxx_state *priv = NULL;
 777         u8 data = 0;
 778
 779         dprintk("%s()\n", __func__);
 780
 781         if (config == NULL || i2c == NULL)
 782                 return NULL;
 783
 784         priv = kzalloc(sizeof(struct lgs8gxx_state), GFP_KERNEL);
 785         if (priv == NULL)
 786                 goto error_out;
 787
 788         priv->config = config;
 789         priv->i2c = i2c;
 790
 791         /* check if the demod is there */
 792         if (lgs8gxx_read_reg(priv, 0, &data) != 0) {
 793                 dprintk("%s lgs8gxx not found at i2c addr 0x%02X\n",
 794                         __func__, priv->config->demod_address);
 795                 goto error_out;
 796         }
 797
 798         lgs8gxx_read_reg(priv, 1, &data);
 799
 800         memcpy(&priv->frontend.ops, &lgs8gxx_ops,
 801                sizeof(struct dvb_frontend_ops));
 802         priv->frontend.demodulator_priv = priv;
 803
 804         return &priv->frontend;
 805
 806 error_out:
 807         dprintk("%s() error_out\n", __func__);
 808         kfree(priv);
 809         return NULL;
 810
 811 }
 812 EXPORT_SYMBOL(lgs8gxx_attach);
 813
 814 MODULE_DESCRIPTION("Legend Silicon LGS8913/LGS8GXX DMB-TH demodulator driver");
 815 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
 816 MODULE_LICENSE("GPL");