drivers/media/dvb-frontends/tda10086.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2   /*
   3      Driver for Philips tda10086 DVBS Demodulator
   4
   5      (c) 2006 Andrew de Quincey
   6
   7
   8    */
   9
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/device.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/string.h>
  15 #include <linux/slab.h>
  16
  17 #include <media/dvb_frontend.h>
  18 #include "tda10086.h"
  19
  20 #define SACLK 96000000
  21
  22 struct tda10086_state {
  23         struct i2c_adapter* i2c;
  24         const struct tda10086_config* config;
  25         struct dvb_frontend frontend;
  26
  27         /* private demod data */
  28         u32 frequency;
  29         u32 symbol_rate;
  30         bool has_lock;
  31 };
  32
  33 static int debug;
  34 #define dprintk(args...) \
  35         do { \
  36                 if (debug) printk(KERN_DEBUG "tda10086: " args); \
  37         } while (0)
  38
  39 static int tda10086_write_byte(struct tda10086_state *state, int reg, int data)
  40 {
  41         int ret;
  42         u8 b0[] = { reg, data };
  43         struct i2c_msg msg = { .flags = 0, .buf = b0, .len = 2 };
  44
  45         msg.addr = state->config->demod_address;
  46         ret = i2c_transfer(state->i2c, &msg, 1);
  47
  48         if (ret != 1)
  49                 dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
  50                         __func__, reg, data, ret);
  51
  52         return (ret != 1) ? ret : 0;
  53 }
  54
  55 static int tda10086_read_byte(struct tda10086_state *state, int reg)
  56 {
  57         int ret;
  58         u8 b0[] = { reg };
  59         u8 b1[] = { 0 };
  60         struct i2c_msg msg[] = {{ .flags = 0, .buf = b0, .len = 1 },
  61                                 { .flags = I2C_M_RD, .buf = b1, .len = 1 }};
  62
  63         msg[0].addr = state->config->demod_address;
  64         msg[1].addr = state->config->demod_address;
  65         ret = i2c_transfer(state->i2c, msg, 2);
  66
  67         if (ret != 2) {
  68                 dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg,
  69                         ret);
  70                 return ret;
  71         }
  72
  73         return b1[0];
  74 }
  75
  76 static int tda10086_write_mask(struct tda10086_state *state, int reg, int mask, int data)
  77 {
  78         int val;
  79
  80         /* read a byte and check */
  81         val = tda10086_read_byte(state, reg);
  82         if (val < 0)
  83                 return val;
  84
  85         /* mask if off */
  86         val = val & ~mask;
  87         val |= data & 0xff;
  88
  89         /* write it out again */
  90         return tda10086_write_byte(state, reg, val);
  91 }
  92
  93 static int tda10086_init(struct dvb_frontend* fe)
  94 {
  95         struct tda10086_state* state = fe->demodulator_priv;
  96         u8 t22k_off = 0x80;
  97
  98         dprintk ("%s\n", __func__);
  99
 100         if (state->config->diseqc_tone)
 101                 t22k_off = 0;
 102         /* reset */
 103         tda10086_write_byte(state, 0x00, 0x00);
 104         msleep(10);
 105
 106         /* misc setup */
 107         tda10086_write_byte(state, 0x01, 0x94);
 108         tda10086_write_byte(state, 0x02, 0x35); /* NOTE: TT drivers appear to disable CSWP */
 109         tda10086_write_byte(state, 0x03, 0xe4);
 110         tda10086_write_byte(state, 0x04, 0x43);
 111         tda10086_write_byte(state, 0x0c, 0x0c);
 112         tda10086_write_byte(state, 0x1b, 0xb0); /* noise threshold */
 113         tda10086_write_byte(state, 0x20, 0x89); /* misc */
 114         tda10086_write_byte(state, 0x30, 0x04); /* acquisition period length */
 115         tda10086_write_byte(state, 0x32, 0x00); /* irq off */
 116         tda10086_write_byte(state, 0x31, 0x56); /* setup AFC */
 117
 118         /* setup PLL (this assumes SACLK = 96MHz) */
 119         tda10086_write_byte(state, 0x55, 0x2c); /* misc PLL setup */
 120         if (state->config->xtal_freq == TDA10086_XTAL_16M) {
 121                 tda10086_write_byte(state, 0x3a, 0x0b); /* M=12 */
 122                 tda10086_write_byte(state, 0x3b, 0x01); /* P=2 */
 123         } else {
 124                 tda10086_write_byte(state, 0x3a, 0x17); /* M=24 */
 125                 tda10086_write_byte(state, 0x3b, 0x00); /* P=1 */
 126         }
 127         tda10086_write_mask(state, 0x55, 0x20, 0x00); /* powerup PLL */
 128
 129         /* setup TS interface */
 130         tda10086_write_byte(state, 0x11, 0x81);
 131         tda10086_write_byte(state, 0x12, 0x81);
 132         tda10086_write_byte(state, 0x19, 0x40); /* parallel mode A + MSBFIRST */
 133         tda10086_write_byte(state, 0x56, 0x80); /* powerdown WPLL - unused in the mode we use */
 134         tda10086_write_byte(state, 0x57, 0x08); /* bypass WPLL - unused in the mode we use */
 135         tda10086_write_byte(state, 0x10, 0x2a);
 136
 137         /* setup ADC */
 138         tda10086_write_byte(state, 0x58, 0x61); /* ADC setup */
 139         tda10086_write_mask(state, 0x58, 0x01, 0x00); /* powerup ADC */
 140
 141         /* setup AGC */
 142         tda10086_write_byte(state, 0x05, 0x0B);
 143         tda10086_write_byte(state, 0x37, 0x63);
 144         tda10086_write_byte(state, 0x3f, 0x0a); /* NOTE: flydvb varies it */
 145         tda10086_write_byte(state, 0x40, 0x64);
 146         tda10086_write_byte(state, 0x41, 0x4f);
 147         tda10086_write_byte(state, 0x42, 0x43);
 148
 149         /* setup viterbi */
 150         tda10086_write_byte(state, 0x1a, 0x11); /* VBER 10^6, DVB, QPSK */
 151
 152         /* setup carrier recovery */
 153         tda10086_write_byte(state, 0x3d, 0x80);
 154
 155         /* setup SEC */
 156         tda10086_write_byte(state, 0x36, t22k_off); /* all SEC off, 22k tone */
 157         tda10086_write_byte(state, 0x34, (((1<<19) * (22000/1000)) / (SACLK/1000)));
 158         tda10086_write_byte(state, 0x35, (((1<<19) * (22000/1000)) / (SACLK/1000)) >> 8);
 159
 160         return 0;
 161 }
 162
 163 static void tda10086_diseqc_wait(struct tda10086_state *state)
 164 {
 165         unsigned long timeout = jiffies + msecs_to_jiffies(200);
 166         while (!(tda10086_read_byte(state, 0x50) & 0x01)) {
 167                 if(time_after(jiffies, timeout)) {
 168                         printk("%s: diseqc queue not ready, command may be lost.\n", __func__);
 169                         break;
 170                 }
 171                 msleep(10);
 172         }
 173 }
 174
 175 static int tda10086_set_tone(struct dvb_frontend *fe,
 176                              enum fe_sec_tone_mode tone)
 177 {
 178         struct tda10086_state* state = fe->demodulator_priv;
 179         u8 t22k_off = 0x80;
 180
 181         dprintk ("%s\n", __func__);
 182
 183         if (state->config->diseqc_tone)
 184                 t22k_off = 0;
 185
 186         switch (tone) {
 187         case SEC_TONE_OFF:
 188                 tda10086_write_byte(state, 0x36, t22k_off);
 189                 break;
 190
 191         case SEC_TONE_ON:
 192                 tda10086_write_byte(state, 0x36, 0x01 + t22k_off);
 193                 break;
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int tda10086_send_master_cmd (struct dvb_frontend* fe,
 200                                     struct dvb_diseqc_master_cmd* cmd)
 201 {
 202         struct tda10086_state* state = fe->demodulator_priv;
 203         int i;
 204         u8 oldval;
 205         u8 t22k_off = 0x80;
 206
 207         dprintk ("%s\n", __func__);
 208
 209         if (state->config->diseqc_tone)
 210                 t22k_off = 0;
 211
 212         if (cmd->msg_len > 6)
 213                 return -EINVAL;
 214         oldval = tda10086_read_byte(state, 0x36);
 215
 216         for(i=0; i< cmd->msg_len; i++) {
 217                 tda10086_write_byte(state, 0x48+i, cmd->msg[i]);
 218         }
 219         tda10086_write_byte(state, 0x36, (0x08 + t22k_off)
 220                                         | ((cmd->msg_len - 1) << 4));
 221
 222         tda10086_diseqc_wait(state);
 223
 224         tda10086_write_byte(state, 0x36, oldval);
 225
 226         return 0;
 227 }
 228
 229 static int tda10086_send_burst(struct dvb_frontend *fe,
 230                                enum fe_sec_mini_cmd minicmd)
 231 {
 232         struct tda10086_state* state = fe->demodulator_priv;
 233         u8 oldval = tda10086_read_byte(state, 0x36);
 234         u8 t22k_off = 0x80;
 235
 236         dprintk ("%s\n", __func__);
 237
 238         if (state->config->diseqc_tone)
 239                 t22k_off = 0;
 240
 241         switch(minicmd) {
 242         case SEC_MINI_A:
 243                 tda10086_write_byte(state, 0x36, 0x04 + t22k_off);
 244                 break;
 245
 246         case SEC_MINI_B:
 247                 tda10086_write_byte(state, 0x36, 0x06 + t22k_off);
 248                 break;
 249         }
 250
 251         tda10086_diseqc_wait(state);
 252
 253         tda10086_write_byte(state, 0x36, oldval);
 254
 255         return 0;
 256 }
 257
 258 static int tda10086_set_inversion(struct tda10086_state *state,
 259                                   struct dtv_frontend_properties *fe_params)
 260 {
 261         u8 invval = 0x80;
 262
 263         dprintk ("%s %i %i\n", __func__, fe_params->inversion, state->config->invert);
 264
 265         switch(fe_params->inversion) {
 266         case INVERSION_OFF:
 267                 if (state->config->invert)
 268                         invval = 0x40;
 269                 break;
 270         case INVERSION_ON:
 271                 if (!state->config->invert)
 272                         invval = 0x40;
 273                 break;
 274         case INVERSION_AUTO:
 275                 invval = 0x00;
 276                 break;
 277         }
 278         tda10086_write_mask(state, 0x0c, 0xc0, invval);
 279
 280         return 0;
 281 }
 282
 283 static int tda10086_set_symbol_rate(struct tda10086_state *state,
 284                                     struct dtv_frontend_properties *fe_params)
 285 {
 286         u8 dfn = 0;
 287         u8 afs = 0;
 288         u8 byp = 0;
 289         u8 reg37 = 0x43;
 290         u8 reg42 = 0x43;
 291         u64 big;
 292         u32 tmp;
 293         u32 bdr;
 294         u32 bdri;
 295         u32 symbol_rate = fe_params->symbol_rate;
 296
 297         dprintk ("%s %i\n", __func__, symbol_rate);
 298
 299         /* setup the decimation and anti-aliasing filters.. */
 300         if (symbol_rate < (u32) (SACLK * 0.0137)) {
 301                 dfn=4;
 302                 afs=1;
 303         } else if (symbol_rate < (u32) (SACLK * 0.0208)) {
 304                 dfn=4;
 305                 afs=0;
 306         } else if (symbol_rate < (u32) (SACLK * 0.0270)) {
 307                 dfn=3;
 308                 afs=1;
 309         } else if (symbol_rate < (u32) (SACLK * 0.0416)) {
 310                 dfn=3;
 311                 afs=0;
 312         } else if (symbol_rate < (u32) (SACLK * 0.0550)) {
 313                 dfn=2;
 314                 afs=1;
 315         } else if (symbol_rate < (u32) (SACLK * 0.0833)) {
 316                 dfn=2;
 317                 afs=0;
 318         } else if (symbol_rate < (u32) (SACLK * 0.1100)) {
 319                 dfn=1;
 320                 afs=1;
 321         } else if (symbol_rate < (u32) (SACLK * 0.1666)) {
 322                 dfn=1;
 323                 afs=0;
 324         } else if (symbol_rate < (u32) (SACLK * 0.2200)) {
 325                 dfn=0;
 326                 afs=1;
 327         } else if (symbol_rate < (u32) (SACLK * 0.3333)) {
 328                 dfn=0;
 329                 afs=0;
 330         } else {
 331                 reg37 = 0x63;
 332                 reg42 = 0x4f;
 333                 byp=1;
 334         }
 335
 336         /* calculate BDR */
 337         big = (1ULL<<21) * ((u64) symbol_rate/1000ULL) * (1ULL<<dfn);
 338         big += ((SACLK/1000ULL)-1ULL);
 339         do_div(big, (SACLK/1000ULL));
 340         bdr = big & 0xfffff;
 341
 342         /* calculate BDRI */
 343         tmp = (1<<dfn)*(symbol_rate/1000);
 344         bdri = ((32 * (SACLK/1000)) + (tmp-1)) / tmp;
 345
 346         tda10086_write_byte(state, 0x21, (afs << 7) | dfn);
 347         tda10086_write_mask(state, 0x20, 0x08, byp << 3);
 348         tda10086_write_byte(state, 0x06, bdr);
 349         tda10086_write_byte(state, 0x07, bdr >> 8);
 350         tda10086_write_byte(state, 0x08, bdr >> 16);
 351         tda10086_write_byte(state, 0x09, bdri);
 352         tda10086_write_byte(state, 0x37, reg37);
 353         tda10086_write_byte(state, 0x42, reg42);
 354
 355         return 0;
 356 }
 357
 358 static int tda10086_set_fec(struct tda10086_state *state,
 359                             struct dtv_frontend_properties *fe_params)
 360 {
 361         u8 fecval;
 362
 363         dprintk("%s %i\n", __func__, fe_params->fec_inner);
 364
 365         switch (fe_params->fec_inner) {
 366         case FEC_1_2:
 367                 fecval = 0x00;
 368                 break;
 369         case FEC_2_3:
 370                 fecval = 0x01;
 371                 break;
 372         case FEC_3_4:
 373                 fecval = 0x02;
 374                 break;
 375         case FEC_4_5:
 376                 fecval = 0x03;
 377                 break;
 378         case FEC_5_6:
 379                 fecval = 0x04;
 380                 break;
 381         case FEC_6_7:
 382                 fecval = 0x05;
 383                 break;
 384         case FEC_7_8:
 385                 fecval = 0x06;
 386                 break;
 387         case FEC_8_9:
 388                 fecval = 0x07;
 389                 break;
 390         case FEC_AUTO:
 391                 fecval = 0x08;
 392                 break;
 393         default:
 394                 return -1;
 395         }
 396         tda10086_write_byte(state, 0x0d, fecval);
 397
 398         return 0;
 399 }
 400
 401 static int tda10086_set_frontend(struct dvb_frontend *fe)
 402 {
 403         struct dtv_frontend_properties *fe_params = &fe->dtv_property_cache;
 404         struct tda10086_state *state = fe->demodulator_priv;
 405         int ret;
 406         u32 freq = 0;
 407         int freqoff;
 408
 409         dprintk ("%s\n", __func__);
 410
 411         /* modify parameters for tuning */
 412         tda10086_write_byte(state, 0x02, 0x35);
 413         state->has_lock = false;
 414
 415         /* set params */
 416         if (fe->ops.tuner_ops.set_params) {
 417                 fe->ops.tuner_ops.set_params(fe);
 418                 if (fe->ops.i2c_gate_ctrl)
 419                         fe->ops.i2c_gate_ctrl(fe, 0);
 420
 421                 if (fe->ops.tuner_ops.get_frequency)
 422                         fe->ops.tuner_ops.get_frequency(fe, &freq);
 423                 if (fe->ops.i2c_gate_ctrl)
 424                         fe->ops.i2c_gate_ctrl(fe, 0);
 425         }
 426
 427         /* calculate the frequency offset (in *Hz* not kHz) */
 428         freqoff = fe_params->frequency - freq;
 429         freqoff = ((1<<16) * freqoff) / (SACLK/1000);
 430         tda10086_write_byte(state, 0x3d, 0x80 | ((freqoff >> 8) & 0x7f));
 431         tda10086_write_byte(state, 0x3e, freqoff);
 432
 433         if ((ret = tda10086_set_inversion(state, fe_params)) < 0)
 434                 return ret;
 435         if ((ret = tda10086_set_symbol_rate(state, fe_params)) < 0)
 436                 return ret;
 437         if ((ret = tda10086_set_fec(state, fe_params)) < 0)
 438                 return ret;
 439
 440         /* soft reset + disable TS output until lock */
 441         tda10086_write_mask(state, 0x10, 0x40, 0x40);
 442         tda10086_write_mask(state, 0x00, 0x01, 0x00);
 443
 444         state->symbol_rate = fe_params->symbol_rate;
 445         state->frequency = fe_params->frequency;
 446         return 0;
 447 }
 448
 449 static int tda10086_get_frontend(struct dvb_frontend *fe,
 450                                  struct dtv_frontend_properties *fe_params)
 451 {
 452         struct tda10086_state* state = fe->demodulator_priv;
 453         u8 val;
 454         int tmp;
 455         u64 tmp64;
 456
 457         dprintk ("%s\n", __func__);
 458
 459         /* check for invalid symbol rate */
 460         if (fe_params->symbol_rate < 500000)
 461                 return -EINVAL;
 462
 463         /* calculate the updated frequency (note: we convert from Hz->kHz) */
 464         tmp64 = ((u64)tda10086_read_byte(state, 0x52)
 465                 | (tda10086_read_byte(state, 0x51) << 8));
 466         if (tmp64 & 0x8000)
 467                 tmp64 |= 0xffffffffffff0000ULL;
 468         tmp64 = (tmp64 * (SACLK/1000ULL));
 469         do_div(tmp64, (1ULL<<15) * (1ULL<<1));
 470         fe_params->frequency = (int) state->frequency + (int) tmp64;
 471
 472         /* the inversion */
 473         val = tda10086_read_byte(state, 0x0c);
 474         if (val & 0x80) {
 475                 switch(val & 0x40) {
 476                 case 0x00:
 477                         fe_params->inversion = INVERSION_OFF;
 478                         if (state->config->invert)
 479                                 fe_params->inversion = INVERSION_ON;
 480                         break;
 481                 default:
 482                         fe_params->inversion = INVERSION_ON;
 483                         if (state->config->invert)
 484                                 fe_params->inversion = INVERSION_OFF;
 485                         break;
 486                 }
 487         } else {
 488                 tda10086_read_byte(state, 0x0f);
 489                 switch(val & 0x02) {
 490                 case 0x00:
 491                         fe_params->inversion = INVERSION_OFF;
 492                         if (state->config->invert)
 493                                 fe_params->inversion = INVERSION_ON;
 494                         break;
 495                 default:
 496                         fe_params->inversion = INVERSION_ON;
 497                         if (state->config->invert)
 498                                 fe_params->inversion = INVERSION_OFF;
 499                         break;
 500                 }
 501         }
 502
 503         /* calculate the updated symbol rate */
 504         tmp = tda10086_read_byte(state, 0x1d);
 505         if (tmp & 0x80)
 506                 tmp |= 0xffffff00;
 507         tmp = (tmp * 480 * (1<<1)) / 128;
 508         tmp = ((state->symbol_rate/1000) * tmp) / (1000000/1000);
 509         fe_params->symbol_rate = state->symbol_rate + tmp;
 510
 511         /* the FEC */
 512         val = (tda10086_read_byte(state, 0x0d) & 0x70) >> 4;
 513         switch(val) {
 514         case 0x00:
 515                 fe_params->fec_inner = FEC_1_2;
 516                 break;
 517         case 0x01:
 518                 fe_params->fec_inner = FEC_2_3;
 519                 break;
 520         case 0x02:
 521                 fe_params->fec_inner = FEC_3_4;
 522                 break;
 523         case 0x03:
 524                 fe_params->fec_inner = FEC_4_5;
 525                 break;
 526         case 0x04:
 527                 fe_params->fec_inner = FEC_5_6;
 528                 break;
 529         case 0x05:
 530                 fe_params->fec_inner = FEC_6_7;
 531                 break;
 532         case 0x06:
 533                 fe_params->fec_inner = FEC_7_8;
 534                 break;
 535         case 0x07:
 536                 fe_params->fec_inner = FEC_8_9;
 537                 break;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int tda10086_read_status(struct dvb_frontend *fe,
 544                                 enum fe_status *fe_status)
 545 {
 546         struct tda10086_state* state = fe->demodulator_priv;
 547         u8 val;
 548
 549         dprintk ("%s\n", __func__);
 550
 551         val = tda10086_read_byte(state, 0x0e);
 552         *fe_status = 0;
 553         if (val & 0x01)
 554                 *fe_status |= FE_HAS_SIGNAL;
 555         if (val & 0x02)
 556                 *fe_status |= FE_HAS_CARRIER;
 557         if (val & 0x04)
 558                 *fe_status |= FE_HAS_VITERBI;
 559         if (val & 0x08)
 560                 *fe_status |= FE_HAS_SYNC;
 561         if (val & 0x10) {
 562                 *fe_status |= FE_HAS_LOCK;
 563                 if (!state->has_lock) {
 564                         state->has_lock = true;
 565                         /* modify parameters for stable reception */
 566                         tda10086_write_byte(state, 0x02, 0x00);
 567                 }
 568         }
 569
 570         return 0;
 571 }
 572
 573 static int tda10086_read_signal_strength(struct dvb_frontend* fe, u16 * signal)
 574 {
 575         struct tda10086_state* state = fe->demodulator_priv;
 576         u8 _str;
 577
 578         dprintk ("%s\n", __func__);
 579
 580         _str = 0xff - tda10086_read_byte(state, 0x43);
 581         *signal = (_str << 8) | _str;
 582
 583         return 0;
 584 }
 585
 586 static int tda10086_read_snr(struct dvb_frontend* fe, u16 * snr)
 587 {
 588         struct tda10086_state* state = fe->demodulator_priv;
 589         u8 _snr;
 590
 591         dprintk ("%s\n", __func__);
 592
 593         _snr = 0xff - tda10086_read_byte(state, 0x1c);
 594         *snr = (_snr << 8) | _snr;
 595
 596         return 0;
 597 }
 598
 599 static int tda10086_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 600 {
 601         struct tda10086_state* state = fe->demodulator_priv;
 602
 603         dprintk ("%s\n", __func__);
 604
 605         /* read it */
 606         *ucblocks = tda10086_read_byte(state, 0x18) & 0x7f;
 607
 608         /* reset counter */
 609         tda10086_write_byte(state, 0x18, 0x00);
 610         tda10086_write_byte(state, 0x18, 0x80);
 611
 612         return 0;
 613 }
 614
 615 static int tda10086_read_ber(struct dvb_frontend* fe, u32* ber)
 616 {
 617         struct tda10086_state* state = fe->demodulator_priv;
 618
 619         dprintk ("%s\n", __func__);
 620
 621         /* read it */
 622         *ber = 0;
 623         *ber |= tda10086_read_byte(state, 0x15);
 624         *ber |= tda10086_read_byte(state, 0x16) << 8;
 625         *ber |= (tda10086_read_byte(state, 0x17) & 0xf) << 16;
 626
 627         return 0;
 628 }
 629
 630 static int tda10086_sleep(struct dvb_frontend* fe)
 631 {
 632         struct tda10086_state* state = fe->demodulator_priv;
 633
 634         dprintk ("%s\n", __func__);
 635
 636         tda10086_write_mask(state, 0x00, 0x08, 0x08);
 637
 638         return 0;
 639 }
 640
 641 static int tda10086_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 642 {
 643         struct tda10086_state* state = fe->demodulator_priv;
 644
 645         dprintk ("%s\n", __func__);
 646
 647         if (enable) {
 648                 tda10086_write_mask(state, 0x00, 0x10, 0x10);
 649         } else {
 650                 tda10086_write_mask(state, 0x00, 0x10, 0x00);
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int tda10086_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 657 {
 658         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 659
 660         if (p->symbol_rate > 20000000) {
 661                 fesettings->min_delay_ms = 50;
 662                 fesettings->step_size = 2000;
 663                 fesettings->max_drift = 8000;
 664         } else if (p->symbol_rate > 12000000) {
 665                 fesettings->min_delay_ms = 100;
 666                 fesettings->step_size = 1500;
 667                 fesettings->max_drift = 9000;
 668         } else if (p->symbol_rate > 8000000) {
 669                 fesettings->min_delay_ms = 100;
 670                 fesettings->step_size = 1000;
 671                 fesettings->max_drift = 8000;
 672         } else if (p->symbol_rate > 4000000) {
 673                 fesettings->min_delay_ms = 100;
 674                 fesettings->step_size = 500;
 675                 fesettings->max_drift = 7000;
 676         } else if (p->symbol_rate > 2000000) {
 677                 fesettings->min_delay_ms = 200;
 678                 fesettings->step_size = p->symbol_rate / 8000;
 679                 fesettings->max_drift = 14 * fesettings->step_size;
 680         } else {
 681                 fesettings->min_delay_ms = 200;
 682                 fesettings->step_size =  p->symbol_rate / 8000;
 683                 fesettings->max_drift = 18 * fesettings->step_size;
 684         }
 685
 686         return 0;
 687 }
 688
 689 static void tda10086_release(struct dvb_frontend* fe)
 690 {
 691         struct tda10086_state *state = fe->demodulator_priv;
 692         tda10086_sleep(fe);
 693         kfree(state);
 694 }
 695
 696 static const struct dvb_frontend_ops tda10086_ops = {
 697         .delsys = { SYS_DVBS },
 698         .info = {
 699                 .name     = "Philips TDA10086 DVB-S",
 700                 .frequency_min_hz      =  950 * MHz,
 701                 .frequency_max_hz      = 2150 * MHz,
 702                 .frequency_stepsize_hz =  125 * kHz,
 703                 .symbol_rate_min  = 1000000,
 704                 .symbol_rate_max  = 45000000,
 705                 .caps = FE_CAN_INVERSION_AUTO |
 706                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 707                         FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 708                         FE_CAN_QPSK
 709         },
 710
 711         .release = tda10086_release,
 712
 713         .init = tda10086_init,
 714         .sleep = tda10086_sleep,
 715         .i2c_gate_ctrl = tda10086_i2c_gate_ctrl,
 716
 717         .set_frontend = tda10086_set_frontend,
 718         .get_frontend = tda10086_get_frontend,
 719         .get_tune_settings = tda10086_get_tune_settings,
 720
 721         .read_status = tda10086_read_status,
 722         .read_ber = tda10086_read_ber,
 723         .read_signal_strength = tda10086_read_signal_strength,
 724         .read_snr = tda10086_read_snr,
 725         .read_ucblocks = tda10086_read_ucblocks,
 726
 727         .diseqc_send_master_cmd = tda10086_send_master_cmd,
 728         .diseqc_send_burst = tda10086_send_burst,
 729         .set_tone = tda10086_set_tone,
 730 };
 731
 732 struct dvb_frontend* tda10086_attach(const struct tda10086_config* config,
 733                                      struct i2c_adapter* i2c)
 734 {
 735         struct tda10086_state *state;
 736
 737         dprintk ("%s\n", __func__);
 738
 739         /* allocate memory for the internal state */
 740         state = kzalloc(sizeof(struct tda10086_state), GFP_KERNEL);
 741         if (!state)
 742                 return NULL;
 743
 744         /* setup the state */
 745         state->config = config;
 746         state->i2c = i2c;
 747
 748         /* check if the demod is there */
 749         if (tda10086_read_byte(state, 0x1e) != 0xe1) {
 750                 kfree(state);
 751                 return NULL;
 752         }
 753
 754         /* create dvb_frontend */
 755         memcpy(&state->frontend.ops, &tda10086_ops, sizeof(struct dvb_frontend_ops));
 756         state->frontend.demodulator_priv = state;
 757         return &state->frontend;
 758 }
 759
 760 module_param(debug, int, 0644);
 761 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 762
 763 MODULE_DESCRIPTION("Philips TDA10086 DVB-S Demodulator");
 764 MODULE_AUTHOR("Andrew de Quincey");
 765 MODULE_LICENSE("GPL");
 766
 767 EXPORT_SYMBOL(tda10086_attach);