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   1   /*
   2      Driver for Philips tda10086 DVBS Demodulator
   3
   4      (c) 2006 Andrew de Quincey
   5
   6      This program is free software; you can redistribute it and/or modify
   7      it under the terms of the GNU General Public License as published by
   8      the Free Software Foundation; either version 2 of the License, or
   9      (at your option) any later version.
  10
  11      This program is distributed in the hope that it will be useful,
  12      but WITHOUT ANY WARRANTY; without even the implied warranty of
  13      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14
  15      GNU General Public License for more details.
  16
  17      You should have received a copy of the GNU General Public License
  18      along with this program; if not, write to the Free Software
  19      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21    */
  22
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/device.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29
  30 #include "dvb_frontend.h"
  31 #include "tda10086.h"
  32
  33 #define SACLK 96000000
  34
  35 struct tda10086_state {
  36         struct i2c_adapter* i2c;
  37         const struct tda10086_config* config;
  38         struct dvb_frontend frontend;
  39
  40         /* private demod data */
  41         u32 frequency;
  42         u32 symbol_rate;
  43         bool has_lock;
  44 };
  45
  46 static int debug = 0;
  47 #define dprintk(args...) \
  48         do { \
  49                 if (debug) printk(KERN_DEBUG "tda10086: " args); \
  50         } while (0)
  51
  52 static int tda10086_write_byte(struct tda10086_state *state, int reg, int data)
  53 {
  54         int ret;
  55         u8 b0[] = { reg, data };
  56         struct i2c_msg msg = { .flags = 0, .buf = b0, .len = 2 };
  57
  58         msg.addr = state->config->demod_address;
  59         ret = i2c_transfer(state->i2c, &msg, 1);
  60
  61         if (ret != 1)
  62                 dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
  63                         __FUNCTION__, reg, data, ret);
  64
  65         return (ret != 1) ? ret : 0;
  66 }
  67
  68 static int tda10086_read_byte(struct tda10086_state *state, int reg)
  69 {
  70         int ret;
  71         u8 b0[] = { reg };
  72         u8 b1[] = { 0 };
  73         struct i2c_msg msg[] = {{ .flags = 0, .buf = b0, .len = 1 },
  74                                 { .flags = I2C_M_RD, .buf = b1, .len = 1 }};
  75
  76         msg[0].addr = state->config->demod_address;
  77         msg[1].addr = state->config->demod_address;
  78         ret = i2c_transfer(state->i2c, msg, 2);
  79
  80         if (ret != 2) {
  81                 dprintk("%s: error reg=0x%x, ret=%i\n", __FUNCTION__, reg,
  82                         ret);
  83                 return ret;
  84         }
  85
  86         return b1[0];
  87 }
  88
  89 static int tda10086_write_mask(struct tda10086_state *state, int reg, int mask, int data)
  90 {
  91         int val;
  92
  93         // read a byte and check
  94         val = tda10086_read_byte(state, reg);
  95         if (val < 0)
  96                 return val;
  97
  98         // mask if off
  99         val = val & ~mask;
 100         val |= data & 0xff;
 101
 102         // write it out again
 103         return tda10086_write_byte(state, reg, val);
 104 }
 105
 106 static int tda10086_init(struct dvb_frontend* fe)
 107 {
 108         struct tda10086_state* state = fe->demodulator_priv;
 109
 110         dprintk ("%s\n", __FUNCTION__);
 111
 112         // reset
 113         tda10086_write_byte(state, 0x00, 0x00);
 114         msleep(10);
 115
 116         // misc setup
 117         tda10086_write_byte(state, 0x01, 0x94);
 118         tda10086_write_byte(state, 0x02, 0x35); // NOTE: TT drivers appear to disable CSWP
 119         tda10086_write_byte(state, 0x03, 0xe4);
 120         tda10086_write_byte(state, 0x04, 0x43);
 121         tda10086_write_byte(state, 0x0c, 0x0c);
 122         tda10086_write_byte(state, 0x1b, 0xb0); // noise threshold
 123         tda10086_write_byte(state, 0x20, 0x89); // misc
 124         tda10086_write_byte(state, 0x30, 0x04); // acquisition period length
 125         tda10086_write_byte(state, 0x32, 0x00); // irq off
 126         tda10086_write_byte(state, 0x31, 0x56); // setup AFC
 127
 128         // setup PLL (assumes 16Mhz XIN)
 129         tda10086_write_byte(state, 0x55, 0x2c); // misc PLL setup
 130         tda10086_write_byte(state, 0x3a, 0x0b); // M=12
 131         tda10086_write_byte(state, 0x3b, 0x01); // P=2
 132         tda10086_write_mask(state, 0x55, 0x20, 0x00); // powerup PLL
 133
 134         // setup TS interface
 135         tda10086_write_byte(state, 0x11, 0x81);
 136         tda10086_write_byte(state, 0x12, 0x81);
 137         tda10086_write_byte(state, 0x19, 0x40); // parallel mode A + MSBFIRST
 138         tda10086_write_byte(state, 0x56, 0x80); // powerdown WPLL - unused in the mode we use
 139         tda10086_write_byte(state, 0x57, 0x08); // bypass WPLL - unused in the mode we use
 140         tda10086_write_byte(state, 0x10, 0x2a);
 141
 142         // setup ADC
 143         tda10086_write_byte(state, 0x58, 0x61); // ADC setup
 144         tda10086_write_mask(state, 0x58, 0x01, 0x00); // powerup ADC
 145
 146         // setup AGC
 147         tda10086_write_byte(state, 0x05, 0x0B);
 148         tda10086_write_byte(state, 0x37, 0x63);
 149         tda10086_write_byte(state, 0x3f, 0x0a); // NOTE: flydvb varies it
 150         tda10086_write_byte(state, 0x40, 0x64);
 151         tda10086_write_byte(state, 0x41, 0x4f);
 152         tda10086_write_byte(state, 0x42, 0x43);
 153
 154         // setup viterbi
 155         tda10086_write_byte(state, 0x1a, 0x11); // VBER 10^6, DVB, QPSK
 156
 157         // setup carrier recovery
 158         tda10086_write_byte(state, 0x3d, 0x80);
 159
 160         // setup SEC
 161         tda10086_write_byte(state, 0x36, 0x80); // all SEC off, no 22k tone
 162         tda10086_write_byte(state, 0x34, (((1<<19) * (22000/1000)) / (SACLK/1000)));      // } tone frequency
 163         tda10086_write_byte(state, 0x35, (((1<<19) * (22000/1000)) / (SACLK/1000)) >> 8); // }
 164
 165         return 0;
 166 }
 167
 168 static void tda10086_diseqc_wait(struct tda10086_state *state)
 169 {
 170         unsigned long timeout = jiffies + msecs_to_jiffies(200);
 171         while (!(tda10086_read_byte(state, 0x50) & 0x01)) {
 172                 if(time_after(jiffies, timeout)) {
 173                         printk("%s: diseqc queue not ready, command may be lost.\n", __FUNCTION__);
 174                         break;
 175                 }
 176                 msleep(10);
 177         }
 178 }
 179
 180 static int tda10086_set_tone (struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 181 {
 182         struct tda10086_state* state = fe->demodulator_priv;
 183
 184         dprintk ("%s\n", __FUNCTION__);
 185
 186         switch (tone) {
 187         case SEC_TONE_OFF:
 188                 tda10086_write_byte(state, 0x36, 0x80);
 189                 break;
 190
 191         case SEC_TONE_ON:
 192                 tda10086_write_byte(state, 0x36, 0x81);
 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
 206         dprintk ("%s\n", __FUNCTION__);
 207
 208         if (cmd->msg_len > 6)
 209                 return -EINVAL;
 210         oldval = tda10086_read_byte(state, 0x36);
 211
 212         for(i=0; i< cmd->msg_len; i++) {
 213                 tda10086_write_byte(state, 0x48+i, cmd->msg[i]);
 214         }
 215         tda10086_write_byte(state, 0x36, 0x88 | ((cmd->msg_len - 1) << 4));
 216
 217         tda10086_diseqc_wait(state);
 218
 219         tda10086_write_byte(state, 0x36, oldval);
 220
 221         return 0;
 222 }
 223
 224 static int tda10086_send_burst (struct dvb_frontend* fe, fe_sec_mini_cmd_t minicmd)
 225 {
 226         struct tda10086_state* state = fe->demodulator_priv;
 227         u8 oldval = tda10086_read_byte(state, 0x36);
 228
 229         dprintk ("%s\n", __FUNCTION__);
 230
 231         switch(minicmd) {
 232         case SEC_MINI_A:
 233                 tda10086_write_byte(state, 0x36, 0x84);
 234                 break;
 235
 236         case SEC_MINI_B:
 237                 tda10086_write_byte(state, 0x36, 0x86);
 238                 break;
 239         }
 240
 241         tda10086_diseqc_wait(state);
 242
 243         tda10086_write_byte(state, 0x36, oldval);
 244
 245         return 0;
 246 }
 247
 248 static int tda10086_set_inversion(struct tda10086_state *state,
 249                                   struct dvb_frontend_parameters *fe_params)
 250 {
 251         u8 invval = 0x80;
 252
 253         dprintk ("%s %i %i\n", __FUNCTION__, fe_params->inversion, state->config->invert);
 254
 255         switch(fe_params->inversion) {
 256         case INVERSION_OFF:
 257                 if (state->config->invert)
 258                         invval = 0x40;
 259                 break;
 260         case INVERSION_ON:
 261                 if (!state->config->invert)
 262                         invval = 0x40;
 263                 break;
 264         case INVERSION_AUTO:
 265                 invval = 0x00;
 266                 break;
 267         }
 268         tda10086_write_mask(state, 0x0c, 0xc0, invval);
 269
 270         return 0;
 271 }
 272
 273 static int tda10086_set_symbol_rate(struct tda10086_state *state,
 274                                     struct dvb_frontend_parameters *fe_params)
 275 {
 276         u8 dfn = 0;
 277         u8 afs = 0;
 278         u8 byp = 0;
 279         u8 reg37 = 0x43;
 280         u8 reg42 = 0x43;
 281         u64 big;
 282         u32 tmp;
 283         u32 bdr;
 284         u32 bdri;
 285         u32 symbol_rate = fe_params->u.qpsk.symbol_rate;
 286
 287         dprintk ("%s %i\n", __FUNCTION__, symbol_rate);
 288
 289         // setup the decimation and anti-aliasing filters..
 290         if (symbol_rate < (u32) (SACLK * 0.0137)) {
 291                 dfn=4;
 292                 afs=1;
 293         } else if (symbol_rate < (u32) (SACLK * 0.0208)) {
 294                 dfn=4;
 295                 afs=0;
 296         } else if (symbol_rate < (u32) (SACLK * 0.0270)) {
 297                 dfn=3;
 298                 afs=1;
 299         } else if (symbol_rate < (u32) (SACLK * 0.0416)) {
 300                 dfn=3;
 301                 afs=0;
 302         } else if (symbol_rate < (u32) (SACLK * 0.0550)) {
 303                 dfn=2;
 304                 afs=1;
 305         } else if (symbol_rate < (u32) (SACLK * 0.0833)) {
 306                 dfn=2;
 307                 afs=0;
 308         } else if (symbol_rate < (u32) (SACLK * 0.1100)) {
 309                 dfn=1;
 310                 afs=1;
 311         } else if (symbol_rate < (u32) (SACLK * 0.1666)) {
 312                 dfn=1;
 313                 afs=0;
 314         } else if (symbol_rate < (u32) (SACLK * 0.2200)) {
 315                 dfn=0;
 316                 afs=1;
 317         } else if (symbol_rate < (u32) (SACLK * 0.3333)) {
 318                 dfn=0;
 319                 afs=0;
 320         } else {
 321                 reg37 = 0x63;
 322                 reg42 = 0x4f;
 323                 byp=1;
 324         }
 325
 326         // calculate BDR
 327         big = (1ULL<<21) * ((u64) symbol_rate/1000ULL) * (1ULL<<dfn);
 328         big += ((SACLK/1000ULL)-1ULL);
 329         do_div(big, (SACLK/1000ULL));
 330         bdr = big & 0xfffff;
 331
 332         // calculate BDRI
 333         tmp = (1<<dfn)*(symbol_rate/1000);
 334         bdri = ((32 * (SACLK/1000)) + (tmp-1)) / tmp;
 335
 336         tda10086_write_byte(state, 0x21, (afs << 7) | dfn);
 337         tda10086_write_mask(state, 0x20, 0x08, byp << 3);
 338         tda10086_write_byte(state, 0x06, bdr);
 339         tda10086_write_byte(state, 0x07, bdr >> 8);
 340         tda10086_write_byte(state, 0x08, bdr >> 16);
 341         tda10086_write_byte(state, 0x09, bdri);
 342         tda10086_write_byte(state, 0x37, reg37);
 343         tda10086_write_byte(state, 0x42, reg42);
 344
 345         return 0;
 346 }
 347
 348 static int tda10086_set_fec(struct tda10086_state *state,
 349                             struct dvb_frontend_parameters *fe_params)
 350 {
 351         u8 fecval;
 352
 353         dprintk ("%s %i\n", __FUNCTION__, fe_params->u.qpsk.fec_inner);
 354
 355         switch(fe_params->u.qpsk.fec_inner) {
 356         case FEC_1_2:
 357                 fecval = 0x00;
 358                 break;
 359         case FEC_2_3:
 360                 fecval = 0x01;
 361                 break;
 362         case FEC_3_4:
 363                 fecval = 0x02;
 364                 break;
 365         case FEC_4_5:
 366                 fecval = 0x03;
 367                 break;
 368         case FEC_5_6:
 369                 fecval = 0x04;
 370                 break;
 371         case FEC_6_7:
 372                 fecval = 0x05;
 373                 break;
 374         case FEC_7_8:
 375                 fecval = 0x06;
 376                 break;
 377         case FEC_8_9:
 378                 fecval = 0x07;
 379                 break;
 380         case FEC_AUTO:
 381                 fecval = 0x08;
 382                 break;
 383         default:
 384                 return -1;
 385         }
 386         tda10086_write_byte(state, 0x0d, fecval);
 387
 388         return 0;
 389 }
 390
 391 static int tda10086_set_frontend(struct dvb_frontend* fe,
 392                                  struct dvb_frontend_parameters *fe_params)
 393 {
 394         struct tda10086_state *state = fe->demodulator_priv;
 395         int ret;
 396         u32 freq = 0;
 397         int freqoff;
 398
 399         dprintk ("%s\n", __FUNCTION__);
 400
 401         // modify parameters for tuning
 402         tda10086_write_byte(state, 0x02, 0x35);
 403         state->has_lock = false;
 404
 405         // set params
 406         if (fe->ops.tuner_ops.set_params) {
 407                 fe->ops.tuner_ops.set_params(fe, fe_params);
 408                 if (fe->ops.i2c_gate_ctrl)
 409                         fe->ops.i2c_gate_ctrl(fe, 0);
 410
 411                 if (fe->ops.tuner_ops.get_frequency)
 412                         fe->ops.tuner_ops.get_frequency(fe, &freq);
 413                 if (fe->ops.i2c_gate_ctrl)
 414                         fe->ops.i2c_gate_ctrl(fe, 0);
 415         }
 416
 417         // calcluate the frequency offset (in *Hz* not kHz)
 418         freqoff = fe_params->frequency - freq;
 419         freqoff = ((1<<16) * freqoff) / (SACLK/1000);
 420         tda10086_write_byte(state, 0x3d, 0x80 | ((freqoff >> 8) & 0x7f));
 421         tda10086_write_byte(state, 0x3e, freqoff);
 422
 423         if ((ret = tda10086_set_inversion(state, fe_params)) < 0)
 424                 return ret;
 425         if ((ret = tda10086_set_symbol_rate(state, fe_params)) < 0)
 426                 return ret;
 427         if ((ret = tda10086_set_fec(state, fe_params)) < 0)
 428                 return ret;
 429
 430         // soft reset + disable TS output until lock
 431         tda10086_write_mask(state, 0x10, 0x40, 0x40);
 432         tda10086_write_mask(state, 0x00, 0x01, 0x00);
 433
 434         state->symbol_rate = fe_params->u.qpsk.symbol_rate;
 435         state->frequency = fe_params->frequency;
 436         return 0;
 437 }
 438
 439 static int tda10086_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *fe_params)
 440 {
 441         struct tda10086_state* state = fe->demodulator_priv;
 442         u8 val;
 443         int tmp;
 444         u64 tmp64;
 445
 446         dprintk ("%s\n", __FUNCTION__);
 447
 448         // check for invalid symbol rate
 449         if (fe_params->u.qpsk.symbol_rate < 500000)
 450                 return -EINVAL;
 451
 452         // calculate the updated frequency (note: we convert from Hz->kHz)
 453         tmp64 = tda10086_read_byte(state, 0x52);
 454         tmp64 |= (tda10086_read_byte(state, 0x51) << 8);
 455         if (tmp64 & 0x8000)
 456                 tmp64 |= 0xffffffffffff0000ULL;
 457         tmp64 = (tmp64 * (SACLK/1000ULL));
 458         do_div(tmp64, (1ULL<<15) * (1ULL<<1));
 459         fe_params->frequency = (int) state->frequency + (int) tmp64;
 460
 461         // the inversion
 462         val = tda10086_read_byte(state, 0x0c);
 463         if (val & 0x80) {
 464                 switch(val & 0x40) {
 465                 case 0x00:
 466                         fe_params->inversion = INVERSION_OFF;
 467                         if (state->config->invert)
 468                                 fe_params->inversion = INVERSION_ON;
 469                         break;
 470                 default:
 471                         fe_params->inversion = INVERSION_ON;
 472                         if (state->config->invert)
 473                                 fe_params->inversion = INVERSION_OFF;
 474                         break;
 475                 }
 476         } else {
 477                 tda10086_read_byte(state, 0x0f);
 478                 switch(val & 0x02) {
 479                 case 0x00:
 480                         fe_params->inversion = INVERSION_OFF;
 481                         if (state->config->invert)
 482                                 fe_params->inversion = INVERSION_ON;
 483                         break;
 484                 default:
 485                         fe_params->inversion = INVERSION_ON;
 486                         if (state->config->invert)
 487                                 fe_params->inversion = INVERSION_OFF;
 488                         break;
 489                 }
 490         }
 491
 492         // calculate the updated symbol rate
 493         tmp = tda10086_read_byte(state, 0x1d);
 494         if (tmp & 0x80)
 495                 tmp |= 0xffffff00;
 496         tmp = (tmp * 480 * (1<<1)) / 128;
 497         tmp = ((state->symbol_rate/1000) * tmp) / (1000000/1000);
 498         fe_params->u.qpsk.symbol_rate = state->symbol_rate + tmp;
 499
 500         // the FEC
 501         val = (tda10086_read_byte(state, 0x0d) & 0x70) >> 4;
 502         switch(val) {
 503         case 0x00:
 504                 fe_params->u.qpsk.fec_inner = FEC_1_2;
 505                 break;
 506         case 0x01:
 507                 fe_params->u.qpsk.fec_inner = FEC_2_3;
 508                 break;
 509         case 0x02:
 510                 fe_params->u.qpsk.fec_inner = FEC_3_4;
 511                 break;
 512         case 0x03:
 513                 fe_params->u.qpsk.fec_inner = FEC_4_5;
 514                 break;
 515         case 0x04:
 516                 fe_params->u.qpsk.fec_inner = FEC_5_6;
 517                 break;
 518         case 0x05:
 519                 fe_params->u.qpsk.fec_inner = FEC_6_7;
 520                 break;
 521         case 0x06:
 522                 fe_params->u.qpsk.fec_inner = FEC_7_8;
 523                 break;
 524         case 0x07:
 525                 fe_params->u.qpsk.fec_inner = FEC_8_9;
 526                 break;
 527         }
 528
 529         return 0;
 530 }
 531
 532 static int tda10086_read_status(struct dvb_frontend* fe, fe_status_t *fe_status)
 533 {
 534         struct tda10086_state* state = fe->demodulator_priv;
 535         u8 val;
 536
 537         dprintk ("%s\n", __FUNCTION__);
 538
 539         val = tda10086_read_byte(state, 0x0e);
 540         *fe_status = 0;
 541         if (val & 0x01)
 542                 *fe_status |= FE_HAS_SIGNAL;
 543         if (val & 0x02)
 544                 *fe_status |= FE_HAS_CARRIER;
 545         if (val & 0x04)
 546                 *fe_status |= FE_HAS_VITERBI;
 547         if (val & 0x08)
 548                 *fe_status |= FE_HAS_SYNC;
 549         if (val & 0x10) {
 550                 *fe_status |= FE_HAS_LOCK;
 551                 if (!state->has_lock) {
 552                         state->has_lock = true;
 553                         // modify parameters for stable reception
 554                         tda10086_write_byte(state, 0x02, 0x00);
 555                 }
 556         }
 557
 558         return 0;
 559 }
 560
 561 static int tda10086_read_signal_strength(struct dvb_frontend* fe, u16 * signal)
 562 {
 563         struct tda10086_state* state = fe->demodulator_priv;
 564         u8 _str;
 565
 566         dprintk ("%s\n", __FUNCTION__);
 567
 568         _str = 0xff - tda10086_read_byte(state, 0x43);
 569         *signal = (_str << 8) | _str;
 570
 571         return 0;
 572 }
 573
 574 static int tda10086_read_snr(struct dvb_frontend* fe, u16 * snr)
 575 {
 576         struct tda10086_state* state = fe->demodulator_priv;
 577         u8 _snr;
 578
 579         dprintk ("%s\n", __FUNCTION__);
 580
 581         _snr = 0xff - tda10086_read_byte(state, 0x1c);
 582         *snr = (_snr << 8) | _snr;
 583
 584         return 0;
 585 }
 586
 587 static int tda10086_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 588 {
 589         struct tda10086_state* state = fe->demodulator_priv;
 590
 591         dprintk ("%s\n", __FUNCTION__);
 592
 593         // read it
 594         *ucblocks = tda10086_read_byte(state, 0x18) & 0x7f;
 595
 596         // reset counter
 597         tda10086_write_byte(state, 0x18, 0x00);
 598         tda10086_write_byte(state, 0x18, 0x80);
 599
 600         return 0;
 601 }
 602
 603 static int tda10086_read_ber(struct dvb_frontend* fe, u32* ber)
 604 {
 605         struct tda10086_state* state = fe->demodulator_priv;
 606
 607         dprintk ("%s\n", __FUNCTION__);
 608
 609         // read it
 610         *ber = 0;
 611         *ber |= tda10086_read_byte(state, 0x15);
 612         *ber |= tda10086_read_byte(state, 0x16) << 8;
 613         *ber |= (tda10086_read_byte(state, 0x17) & 0xf) << 16;
 614
 615         return 0;
 616 }
 617
 618 static int tda10086_sleep(struct dvb_frontend* fe)
 619 {
 620         struct tda10086_state* state = fe->demodulator_priv;
 621
 622         dprintk ("%s\n", __FUNCTION__);
 623
 624         tda10086_write_mask(state, 0x00, 0x08, 0x08);
 625
 626         return 0;
 627 }
 628
 629 static int tda10086_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 630 {
 631         struct tda10086_state* state = fe->demodulator_priv;
 632
 633         dprintk ("%s\n", __FUNCTION__);
 634
 635         if (enable) {
 636                 tda10086_write_mask(state, 0x00, 0x10, 0x10);
 637         } else {
 638                 tda10086_write_mask(state, 0x00, 0x10, 0x00);
 639         }
 640
 641         return 0;
 642 }
 643
 644 static int tda10086_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 645 {
 646         if (fesettings->parameters.u.qpsk.symbol_rate > 20000000) {
 647                 fesettings->min_delay_ms = 50;
 648                 fesettings->step_size = 2000;
 649                 fesettings->max_drift = 8000;
 650         } else if (fesettings->parameters.u.qpsk.symbol_rate > 12000000) {
 651                 fesettings->min_delay_ms = 100;
 652                 fesettings->step_size = 1500;
 653                 fesettings->max_drift = 9000;
 654         } else if (fesettings->parameters.u.qpsk.symbol_rate > 8000000) {
 655                 fesettings->min_delay_ms = 100;
 656                 fesettings->step_size = 1000;
 657                 fesettings->max_drift = 8000;
 658         } else if (fesettings->parameters.u.qpsk.symbol_rate > 4000000) {
 659                 fesettings->min_delay_ms = 100;
 660                 fesettings->step_size = 500;
 661                 fesettings->max_drift = 7000;
 662         } else if (fesettings->parameters.u.qpsk.symbol_rate > 2000000) {
 663                 fesettings->min_delay_ms = 200;
 664                 fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
 665                 fesettings->max_drift = 14 * fesettings->step_size;
 666         } else {
 667                 fesettings->min_delay_ms = 200;
 668                 fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
 669                 fesettings->max_drift = 18 * fesettings->step_size;
 670         }
 671
 672         return 0;
 673 }
 674
 675 static void tda10086_release(struct dvb_frontend* fe)
 676 {
 677         struct tda10086_state *state = fe->demodulator_priv;
 678         tda10086_sleep(fe);
 679         kfree(state);
 680 }
 681
 682 static struct dvb_frontend_ops tda10086_ops = {
 683
 684         .info = {
 685                 .name     = "Philips TDA10086 DVB-S",
 686                 .type     = FE_QPSK,
 687                 .frequency_min    = 950000,
 688                 .frequency_max    = 2150000,
 689                 .frequency_stepsize = 125,     /* kHz for QPSK frontends */
 690                 .symbol_rate_min  = 1000000,
 691                 .symbol_rate_max  = 45000000,
 692                 .caps = FE_CAN_INVERSION_AUTO |
 693                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 694                         FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 695                         FE_CAN_QPSK
 696         },
 697
 698         .release = tda10086_release,
 699
 700         .init = tda10086_init,
 701         .sleep = tda10086_sleep,
 702         .i2c_gate_ctrl = tda10086_i2c_gate_ctrl,
 703
 704         .set_frontend = tda10086_set_frontend,
 705         .get_frontend = tda10086_get_frontend,
 706         .get_tune_settings = tda10086_get_tune_settings,
 707
 708         .read_status = tda10086_read_status,
 709         .read_ber = tda10086_read_ber,
 710         .read_signal_strength = tda10086_read_signal_strength,
 711         .read_snr = tda10086_read_snr,
 712         .read_ucblocks = tda10086_read_ucblocks,
 713
 714         .diseqc_send_master_cmd = tda10086_send_master_cmd,
 715         .diseqc_send_burst = tda10086_send_burst,
 716         .set_tone = tda10086_set_tone,
 717 };
 718
 719 struct dvb_frontend* tda10086_attach(const struct tda10086_config* config,
 720                                      struct i2c_adapter* i2c)
 721 {
 722         struct tda10086_state *state;
 723
 724         dprintk ("%s\n", __FUNCTION__);
 725
 726         /* allocate memory for the internal state */
 727         state = kmalloc(sizeof(struct tda10086_state), GFP_KERNEL);
 728         if (!state)
 729                 return NULL;
 730
 731         /* setup the state */
 732         state->config = config;
 733         state->i2c = i2c;
 734
 735         /* check if the demod is there */
 736         if (tda10086_read_byte(state, 0x1e) != 0xe1) {
 737                 kfree(state);
 738                 return NULL;
 739         }
 740
 741         /* create dvb_frontend */
 742         memcpy(&state->frontend.ops, &tda10086_ops, sizeof(struct dvb_frontend_ops));
 743         state->frontend.demodulator_priv = state;
 744         return &state->frontend;
 745 }
 746
 747 module_param(debug, int, 0644);
 748 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 749
 750 MODULE_DESCRIPTION("Philips TDA10086 DVB-S Demodulator");
 751 MODULE_AUTHOR("Andrew de Quincey");
 752 MODULE_LICENSE("GPL");
 753
 754 EXPORT_SYMBOL(tda10086_attach);