git.oblomov.eu Git - linux-2.6/blob - drivers/media/dvb/frontends/tda10086.c

   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/moduleparam.h>
  26 #include <linux/device.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/string.h>
  29 #include <linux/slab.h>
  30
  31 #include "dvb_frontend.h"
  32 #include "tda10086.h"
  33
  34 #define SACLK 96000000
  35
  36 struct tda10086_state {
  37         struct i2c_adapter* i2c;
  38         const struct tda10086_config* config;
  39         struct dvb_frontend frontend;
  40
  41         /* private demod data */
  42         u32 frequency;
  43         u32 symbol_rate;
  44         bool has_lock;
  45 };
  46
  47 static int debug = 0;
  48 #define dprintk(args...) \
  49         do { \
  50                 if (debug) printk(KERN_DEBUG "tda10086: " args); \
  51         } while (0)
  52
  53 static int tda10086_write_byte(struct tda10086_state *state, int reg, int data)
  54 {
  55         int ret;
  56         u8 b0[] = { reg, data };
  57         struct i2c_msg msg = { .flags = 0, .buf = b0, .len = 2 };
  58
  59         msg.addr = state->config->demod_address;
  60         ret = i2c_transfer(state->i2c, &msg, 1);
  61
  62         if (ret != 1)
  63                 dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
  64                         __FUNCTION__, reg, data, ret);
  65
  66         return (ret != 1) ? ret : 0;
  67 }
  68
  69 static int tda10086_read_byte(struct tda10086_state *state, int reg)
  70 {
  71         int ret;
  72         u8 b0[] = { reg };
  73         u8 b1[] = { 0 };
  74         struct i2c_msg msg[] = {{ .flags = 0, .buf = b0, .len = 1 },
  75                                 { .flags = I2C_M_RD, .buf = b1, .len = 1 }};
  76
  77         msg[0].addr = state->config->demod_address;
  78         msg[1].addr = state->config->demod_address;
  79         ret = i2c_transfer(state->i2c, msg, 2);
  80
  81         if (ret != 2) {
  82                 dprintk("%s: error reg=0x%x, ret=%i\n", __FUNCTION__, reg,
  83                         ret);
  84                 return ret;
  85         }
  86
  87         return b1[0];
  88 }
  89
  90 static int tda10086_write_mask(struct tda10086_state *state, int reg, int mask, int data)
  91 {
  92         int val;
  93
  94         // read a byte and check
  95         val = tda10086_read_byte(state, reg);
  96         if (val < 0)
  97                 return val;
  98
  99         // mask if off
 100         val = val & ~mask;
 101         val |= data & 0xff;
 102
 103         // write it out again
 104         return tda10086_write_byte(state, reg, val);
 105 }
 106
 107 static int tda10086_init(struct dvb_frontend* fe)
 108 {
 109         struct tda10086_state* state = fe->demodulator_priv;
 110
 111         dprintk ("%s\n", __FUNCTION__);
 112
 113         // reset
 114         tda10086_write_byte(state, 0x00, 0x00);
 115         msleep(10);
 116
 117         // misc setup
 118         tda10086_write_byte(state, 0x01, 0x94);
 119         tda10086_write_byte(state, 0x02, 0x35); // NOTE: TT drivers appear to disable CSWP
 120         tda10086_write_byte(state, 0x03, 0xe4);
 121         tda10086_write_byte(state, 0x04, 0x43);
 122         tda10086_write_byte(state, 0x0c, 0x0c);
 123         tda10086_write_byte(state, 0x1b, 0xb0); // noise threshold
 124         tda10086_write_byte(state, 0x20, 0x89); // misc
 125         tda10086_write_byte(state, 0x30, 0x04); // acquisition period length
 126         tda10086_write_byte(state, 0x32, 0x00); // irq off
 127         tda10086_write_byte(state, 0x31, 0x56); // setup AFC
 128
 129         // setup PLL (assumes 16Mhz XIN)
 130         tda10086_write_byte(state, 0x55, 0x2c); // misc PLL setup
 131         tda10086_write_byte(state, 0x3a, 0x0b); // M=12
 132         tda10086_write_byte(state, 0x3b, 0x01); // P=2
 133         tda10086_write_mask(state, 0x55, 0x20, 0x00); // powerup PLL
 134
 135         // setup TS interface
 136         tda10086_write_byte(state, 0x11, 0x81);
 137         tda10086_write_byte(state, 0x12, 0x81);
 138         tda10086_write_byte(state, 0x19, 0x40); // parallel mode A + MSBFIRST
 139         tda10086_write_byte(state, 0x56, 0x80); // powerdown WPLL - unused in the mode we use
 140         tda10086_write_byte(state, 0x57, 0x08); // bypass WPLL - unused in the mode we use
 141         tda10086_write_byte(state, 0x10, 0x2a);
 142
 143         // setup ADC
 144         tda10086_write_byte(state, 0x58, 0x61); // ADC setup
 145         tda10086_write_mask(state, 0x58, 0x01, 0x00); // powerup ADC
 146
 147         // setup AGC
 148         tda10086_write_byte(state, 0x05, 0x0B);
 149         tda10086_write_byte(state, 0x37, 0x63);
 150         tda10086_write_byte(state, 0x3f, 0x0a); // NOTE: flydvb varies it
 151         tda10086_write_byte(state, 0x40, 0x64);
 152         tda10086_write_byte(state, 0x41, 0x4f);
 153         tda10086_write_byte(state, 0x42, 0x43);
 154
 155         // setup viterbi
 156         tda10086_write_byte(state, 0x1a, 0x11); // VBER 10^6, DVB, QPSK
 157
 158         // setup carrier recovery
 159         tda10086_write_byte(state, 0x3d, 0x80);
 160
 161         // setup SEC
 162         tda10086_write_byte(state, 0x36, 0x00); // all SEC off
 163         tda10086_write_byte(state, 0x34, (((1<<19) * (22000/1000)) / (SACLK/1000)));      // } tone frequency
 164         tda10086_write_byte(state, 0x35, (((1<<19) * (22000/1000)) / (SACLK/1000)) >> 8); // }
 165
 166         return 0;
 167 }
 168
 169 static void tda10086_diseqc_wait(struct tda10086_state *state)
 170 {
 171         unsigned long timeout = jiffies + msecs_to_jiffies(200);
 172         while (!(tda10086_read_byte(state, 0x50) & 0x01)) {
 173                 if(time_after(jiffies, timeout)) {
 174                         printk("%s: diseqc queue not ready, command may be lost.\n", __FUNCTION__);
 175                         break;
 176                 }
 177                 msleep(10);
 178         }
 179 }
 180
 181 static int tda10086_set_tone (struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 182 {
 183         struct tda10086_state* state = fe->demodulator_priv;
 184
 185         dprintk ("%s\n", __FUNCTION__);
 186
 187         switch(tone) {
 188         case SEC_TONE_OFF:
 189                 tda10086_write_byte(state, 0x36, 0x00);
 190                 break;
 191
 192         case SEC_TONE_ON:
 193                 tda10086_write_byte(state, 0x36, 0x01);
 194                 break;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int tda10086_send_master_cmd (struct dvb_frontend* fe,
 201                                     struct dvb_diseqc_master_cmd* cmd)
 202 {
 203         struct tda10086_state* state = fe->demodulator_priv;
 204         int i;
 205         u8 oldval;
 206
 207         dprintk ("%s\n", __FUNCTION__);
 208
 209         if (cmd->msg_len > 6)
 210                 return -EINVAL;
 211         oldval = tda10086_read_byte(state, 0x36);
 212
 213         for(i=0; i< cmd->msg_len; i++) {
 214                 tda10086_write_byte(state, 0x48+i, cmd->msg[i]);
 215         }
 216         tda10086_write_byte(state, 0x36, 0x08 | ((cmd->msg_len - 1) << 4));
 217
 218         tda10086_diseqc_wait(state);
 219
 220         tda10086_write_byte(state, 0x36, oldval);
 221
 222         return 0;
 223 }
 224
 225 static int tda10086_send_burst (struct dvb_frontend* fe, fe_sec_mini_cmd_t minicmd)
 226 {
 227         struct tda10086_state* state = fe->demodulator_priv;
 228         u8 oldval = tda10086_read_byte(state, 0x36);
 229
 230         dprintk ("%s\n", __FUNCTION__);
 231
 232         switch(minicmd) {
 233         case SEC_MINI_A:
 234                 tda10086_write_byte(state, 0x36, 0x04);
 235                 break;
 236
 237         case SEC_MINI_B:
 238                 tda10086_write_byte(state, 0x36, 0x06);
 239                 break;
 240         }
 241
 242         tda10086_diseqc_wait(state);
 243
 244         tda10086_write_byte(state, 0x36, oldval);
 245
 246         return 0;
 247 }
 248
 249 static int tda10086_set_inversion(struct tda10086_state *state,
 250                                   struct dvb_frontend_parameters *fe_params)
 251 {
 252         u8 invval = 0x80;
 253
 254         dprintk ("%s %i %i\n", __FUNCTION__, fe_params->inversion, state->config->invert);
 255
 256         switch(fe_params->inversion) {
 257         case INVERSION_OFF:
 258                 if (state->config->invert)
 259                         invval = 0x40;
 260                 break;
 261         case INVERSION_ON:
 262                 if (!state->config->invert)
 263                         invval = 0x40;
 264                 break;
 265         case INVERSION_AUTO:
 266                 invval = 0x00;
 267                 break;
 268         }
 269         tda10086_write_mask(state, 0x0c, 0xc0, invval);
 270
 271         return 0;
 272 }
 273
 274 static int tda10086_set_symbol_rate(struct tda10086_state *state,
 275                                     struct dvb_frontend_parameters *fe_params)
 276 {
 277         u8 dfn = 0;
 278         u8 afs = 0;
 279         u8 byp = 0;
 280         u8 reg37 = 0x43;
 281         u8 reg42 = 0x43;
 282         u64 big;
 283         u32 tmp;
 284         u32 bdr;
 285         u32 bdri;
 286         u32 symbol_rate = fe_params->u.qpsk.symbol_rate;
 287
 288         dprintk ("%s %i\n", __FUNCTION__, symbol_rate);
 289
 290         // setup the decimation and anti-aliasing filters..
 291         if (symbol_rate < (u32) (SACLK * 0.0137)) {
 292                 dfn=4;
 293                 afs=1;
 294         } else if (symbol_rate < (u32) (SACLK * 0.0208)) {
 295                 dfn=4;
 296                 afs=0;
 297         } else if (symbol_rate < (u32) (SACLK * 0.0270)) {
 298                 dfn=3;
 299                 afs=1;
 300         } else if (symbol_rate < (u32) (SACLK * 0.0416)) {
 301                 dfn=3;
 302                 afs=0;
 303         } else if (symbol_rate < (u32) (SACLK * 0.0550)) {
 304                 dfn=2;
 305                 afs=1;
 306         } else if (symbol_rate < (u32) (SACLK * 0.0833)) {
 307                 dfn=2;
 308                 afs=0;
 309         } else if (symbol_rate < (u32) (SACLK * 0.1100)) {
 310                 dfn=1;
 311                 afs=1;
 312         } else if (symbol_rate < (u32) (SACLK * 0.1666)) {
 313                 dfn=1;
 314                 afs=0;
 315         } else if (symbol_rate < (u32) (SACLK * 0.2200)) {
 316                 dfn=0;
 317                 afs=1;
 318         } else if (symbol_rate < (u32) (SACLK * 0.3333)) {
 319                 dfn=0;
 320                 afs=0;
 321         } else {
 322                 reg37 = 0x63;
 323                 reg42 = 0x4f;
 324                 byp=1;
 325         }
 326
 327         // calculate BDR
 328         big = (1ULL<<21) * ((u64) symbol_rate/1000ULL) * (1ULL<<dfn);
 329         big += ((SACLK/1000ULL)-1ULL);
 330         do_div(big, (SACLK/1000ULL));
 331         bdr = big & 0xfffff;
 332
 333         // calculate BDRI
 334         tmp = (1<<dfn)*(symbol_rate/1000);
 335         bdri = ((32 * (SACLK/1000)) + (tmp-1)) / tmp;
 336
 337         tda10086_write_byte(state, 0x21, (afs << 7) | dfn);
 338         tda10086_write_mask(state, 0x20, 0x08, byp << 3);
 339         tda10086_write_byte(state, 0x06, bdr);
 340         tda10086_write_byte(state, 0x07, bdr >> 8);
 341         tda10086_write_byte(state, 0x08, bdr >> 16);
 342         tda10086_write_byte(state, 0x09, bdri);
 343         tda10086_write_byte(state, 0x37, reg37);
 344         tda10086_write_byte(state, 0x42, reg42);
 345
 346         return 0;
 347 }
 348
 349 static int tda10086_set_fec(struct tda10086_state *state,
 350                             struct dvb_frontend_parameters *fe_params)
 351 {
 352         u8 fecval;
 353
 354         dprintk ("%s %i\n", __FUNCTION__, fe_params->u.qpsk.fec_inner);
 355
 356         switch(fe_params->u.qpsk.fec_inner) {
 357         case FEC_1_2:
 358                 fecval = 0x00;
 359                 break;
 360         case FEC_2_3:
 361                 fecval = 0x01;
 362                 break;
 363         case FEC_3_4:
 364                 fecval = 0x02;
 365                 break;
 366         case FEC_4_5:
 367                 fecval = 0x03;
 368                 break;
 369         case FEC_5_6:
 370                 fecval = 0x04;
 371                 break;
 372         case FEC_6_7:
 373                 fecval = 0x05;
 374                 break;
 375         case FEC_7_8:
 376                 fecval = 0x06;
 377                 break;
 378         case FEC_8_9:
 379                 fecval = 0x07;
 380                 break;
 381         case FEC_AUTO:
 382                 fecval = 0x08;
 383                 break;
 384         default:
 385                 return -1;
 386         }
 387         tda10086_write_byte(state, 0x0d, fecval);
 388
 389         return 0;
 390 }
 391
 392 static int tda10086_set_frontend(struct dvb_frontend* fe,
 393                                  struct dvb_frontend_parameters *fe_params)
 394 {
 395         struct tda10086_state *state = fe->demodulator_priv;
 396         int ret;
 397         u32 freq = 0;
 398         int freqoff;
 399
 400         dprintk ("%s\n", __FUNCTION__);
 401
 402         // modify parameters for tuning
 403         tda10086_write_byte(state, 0x02, 0x35);
 404         state->has_lock = false;
 405
 406         // set params
 407         if (fe->ops.tuner_ops.set_params) {
 408                 fe->ops.tuner_ops.set_params(fe, fe_params);
 409                 if (fe->ops.i2c_gate_ctrl)
 410                         fe->ops.i2c_gate_ctrl(fe, 0);
 411
 412                 if (fe->ops.tuner_ops.get_frequency)
 413                         fe->ops.tuner_ops.get_frequency(fe, &freq);
 414                 if (fe->ops.i2c_gate_ctrl)
 415                         fe->ops.i2c_gate_ctrl(fe, 0);
 416         }
 417
 418         // calcluate the frequency offset (in *Hz* not kHz)
 419         freqoff = fe_params->frequency - freq;
 420         freqoff = ((1<<16) * freqoff) / (SACLK/1000);
 421         tda10086_write_byte(state, 0x3d, 0x80 | ((freqoff >> 8) & 0x7f));
 422         tda10086_write_byte(state, 0x3e, freqoff);
 423
 424         if ((ret = tda10086_set_inversion(state, fe_params)) < 0)
 425                 return ret;
 426         if ((ret = tda10086_set_symbol_rate(state, fe_params)) < 0)
 427                 return ret;
 428         if ((ret = tda10086_set_fec(state, fe_params)) < 0)
 429                 return ret;
 430
 431         // soft reset + disable TS output until lock
 432         tda10086_write_mask(state, 0x10, 0x40, 0x40);
 433         tda10086_write_mask(state, 0x00, 0x01, 0x00);
 434
 435         state->symbol_rate = fe_params->u.qpsk.symbol_rate;
 436         state->frequency = fe_params->frequency;
 437         return 0;
 438 }
 439
 440 static int tda10086_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *fe_params)
 441 {
 442         struct tda10086_state* state = fe->demodulator_priv;
 443         u8 val;
 444         int tmp;
 445         u64 tmp64;
 446
 447         dprintk ("%s\n", __FUNCTION__);
 448
 449         // check for invalid symbol rate
 450         if (fe_params->u.qpsk.symbol_rate < 500000)
 451                 return -EINVAL;
 452
 453         // calculate the updated frequency (note: we convert from Hz->kHz)
 454         tmp64 = tda10086_read_byte(state, 0x52);
 455         tmp64 |= (tda10086_read_byte(state, 0x51) << 8);
 456         if (tmp64 & 0x8000)
 457                 tmp64 |= 0xffffffffffff0000ULL;
 458         tmp64 = (tmp64 * (SACLK/1000ULL));
 459         do_div(tmp64, (1ULL<<15) * (1ULL<<1));
 460         fe_params->frequency = (int) state->frequency + (int) tmp64;
 461
 462         // the inversion
 463         val = tda10086_read_byte(state, 0x0c);
 464         if (val & 0x80) {
 465                 switch(val & 0x40) {
 466                 case 0x00:
 467                         fe_params->inversion = INVERSION_OFF;
 468                         if (state->config->invert)
 469                                 fe_params->inversion = INVERSION_ON;
 470                         break;
 471                 default:
 472                         fe_params->inversion = INVERSION_ON;
 473                         if (state->config->invert)
 474                                 fe_params->inversion = INVERSION_OFF;
 475                         break;
 476                 }
 477         } else {
 478                 tda10086_read_byte(state, 0x0f);
 479                 switch(val & 0x02) {
 480                 case 0x00:
 481                         fe_params->inversion = INVERSION_OFF;
 482                         if (state->config->invert)
 483                                 fe_params->inversion = INVERSION_ON;
 484                         break;
 485                 default:
 486                         fe_params->inversion = INVERSION_ON;
 487                         if (state->config->invert)
 488                                 fe_params->inversion = INVERSION_OFF;
 489                         break;
 490                 }
 491         }
 492
 493         // calculate the updated symbol rate
 494         tmp = tda10086_read_byte(state, 0x1d);
 495         if (tmp & 0x80)
 496                 tmp |= 0xffffff00;
 497         tmp = (tmp * 480 * (1<<1)) / 128;
 498         tmp = ((state->symbol_rate/1000) * tmp) / (1000000/1000);
 499         fe_params->u.qpsk.symbol_rate = state->symbol_rate + tmp;
 500
 501         // the FEC
 502         val = (tda10086_read_byte(state, 0x0d) & 0x70) >> 4;
 503         switch(val) {
 504         case 0x00:
 505                 fe_params->u.qpsk.fec_inner = FEC_1_2;
 506                 break;
 507         case 0x01:
 508                 fe_params->u.qpsk.fec_inner = FEC_2_3;
 509                 break;
 510         case 0x02:
 511                 fe_params->u.qpsk.fec_inner = FEC_3_4;
 512                 break;
 513         case 0x03:
 514                 fe_params->u.qpsk.fec_inner = FEC_4_5;
 515                 break;
 516         case 0x04:
 517                 fe_params->u.qpsk.fec_inner = FEC_5_6;
 518                 break;
 519         case 0x05:
 520                 fe_params->u.qpsk.fec_inner = FEC_6_7;
 521                 break;
 522         case 0x06:
 523                 fe_params->u.qpsk.fec_inner = FEC_7_8;
 524                 break;
 525         case 0x07:
 526                 fe_params->u.qpsk.fec_inner = FEC_8_9;
 527                 break;
 528         }
 529
 530         return 0;
 531 }
 532
 533 static int tda10086_read_status(struct dvb_frontend* fe, fe_status_t *fe_status)
 534 {
 535         struct tda10086_state* state = fe->demodulator_priv;
 536         u8 val;
 537
 538         dprintk ("%s\n", __FUNCTION__);
 539
 540         val = tda10086_read_byte(state, 0x0e);
 541         *fe_status = 0;
 542         if (val & 0x01)
 543                 *fe_status |= FE_HAS_SIGNAL;
 544         if (val & 0x02)
 545                 *fe_status |= FE_HAS_CARRIER;
 546         if (val & 0x04)
 547                 *fe_status |= FE_HAS_VITERBI;
 548         if (val & 0x08)
 549                 *fe_status |= FE_HAS_SYNC;
 550         if (val & 0x10) {
 551                 *fe_status |= FE_HAS_LOCK;
 552                 if (!state->has_lock) {
 553                         state->has_lock = true;
 554                         // modify parameters for stable reception
 555                         tda10086_write_byte(state, 0x02, 0x00);
 556                 }
 557         }
 558
 559         return 0;
 560 }
 561
 562 static int tda10086_read_signal_strength(struct dvb_frontend* fe, u16 * signal)
 563 {
 564         struct tda10086_state* state = fe->demodulator_priv;
 565         u8 _str;
 566
 567         dprintk ("%s\n", __FUNCTION__);
 568
 569         _str = 0xff - tda10086_read_byte(state, 0x43);
 570         *signal = (_str << 8) | _str;
 571
 572         return 0;
 573 }
 574
 575 static int tda10086_read_snr(struct dvb_frontend* fe, u16 * snr)
 576 {
 577         struct tda10086_state* state = fe->demodulator_priv;
 578         u8 _snr;
 579
 580         dprintk ("%s\n", __FUNCTION__);
 581
 582         _snr = 0xff - tda10086_read_byte(state, 0x1c);
 583         *snr = (_snr << 8) | _snr;
 584
 585         return 0;
 586 }
 587
 588 static int tda10086_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 589 {
 590         struct tda10086_state* state = fe->demodulator_priv;
 591
 592         dprintk ("%s\n", __FUNCTION__);
 593
 594         // read it
 595         *ucblocks = tda10086_read_byte(state, 0x18) & 0x7f;
 596
 597         // reset counter
 598         tda10086_write_byte(state, 0x18, 0x00);
 599         tda10086_write_byte(state, 0x18, 0x80);
 600
 601         return 0;
 602 }
 603
 604 static int tda10086_read_ber(struct dvb_frontend* fe, u32* ber)
 605 {
 606         struct tda10086_state* state = fe->demodulator_priv;
 607
 608         dprintk ("%s\n", __FUNCTION__);
 609
 610         // read it
 611         *ber = 0;
 612         *ber |= tda10086_read_byte(state, 0x15);
 613         *ber |= tda10086_read_byte(state, 0x16) << 8;
 614         *ber |= (tda10086_read_byte(state, 0x17) & 0xf) << 16;
 615
 616         return 0;
 617 }
 618
 619 static int tda10086_sleep(struct dvb_frontend* fe)
 620 {
 621         struct tda10086_state* state = fe->demodulator_priv;
 622
 623         dprintk ("%s\n", __FUNCTION__);
 624
 625         tda10086_write_mask(state, 0x00, 0x08, 0x08);
 626
 627         return 0;
 628 }
 629
 630 static int tda10086_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 631 {
 632         struct tda10086_state* state = fe->demodulator_priv;
 633
 634         dprintk ("%s\n", __FUNCTION__);
 635
 636         if (enable) {
 637                 tda10086_write_mask(state, 0x00, 0x10, 0x10);
 638         } else {
 639                 tda10086_write_mask(state, 0x00, 0x10, 0x00);
 640         }
 641
 642         return 0;
 643 }
 644
 645 static int tda10086_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 646 {
 647         if (fesettings->parameters.u.qpsk.symbol_rate > 20000000) {
 648                 fesettings->min_delay_ms = 50;
 649                 fesettings->step_size = 2000;
 650                 fesettings->max_drift = 8000;
 651         } else if (fesettings->parameters.u.qpsk.symbol_rate > 12000000) {
 652                 fesettings->min_delay_ms = 100;
 653                 fesettings->step_size = 1500;
 654                 fesettings->max_drift = 9000;
 655         } else if (fesettings->parameters.u.qpsk.symbol_rate > 8000000) {
 656                 fesettings->min_delay_ms = 100;
 657                 fesettings->step_size = 1000;
 658                 fesettings->max_drift = 8000;
 659         } else if (fesettings->parameters.u.qpsk.symbol_rate > 4000000) {
 660                 fesettings->min_delay_ms = 100;
 661                 fesettings->step_size = 500;
 662                 fesettings->max_drift = 7000;
 663         } else if (fesettings->parameters.u.qpsk.symbol_rate > 2000000) {
 664                 fesettings->min_delay_ms = 200;
 665                 fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
 666                 fesettings->max_drift = 14 * fesettings->step_size;
 667         } else {
 668                 fesettings->min_delay_ms = 200;
 669                 fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
 670                 fesettings->max_drift = 18 * fesettings->step_size;
 671         }
 672
 673         return 0;
 674 }
 675
 676 static void tda10086_release(struct dvb_frontend* fe)
 677 {
 678         struct tda10086_state *state = fe->demodulator_priv;
 679         tda10086_sleep(fe);
 680         kfree(state);
 681 }
 682
 683 static struct dvb_frontend_ops tda10086_ops = {
 684
 685         .info = {
 686                 .name     = "Philips TDA10086 DVB-S",
 687                 .type     = FE_QPSK,
 688                 .frequency_min    = 950000,
 689                 .frequency_max    = 2150000,
 690                 .frequency_stepsize = 125,     /* kHz for QPSK frontends */
 691                 .symbol_rate_min  = 1000000,
 692                 .symbol_rate_max  = 45000000,
 693                 .caps = FE_CAN_INVERSION_AUTO |
 694                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 695                         FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 696                         FE_CAN_QPSK
 697         },
 698
 699         .release = tda10086_release,
 700
 701         .init = tda10086_init,
 702         .sleep = tda10086_sleep,
 703         .i2c_gate_ctrl = tda10086_i2c_gate_ctrl,
 704
 705         .set_frontend = tda10086_set_frontend,
 706         .get_frontend = tda10086_get_frontend,
 707         .get_tune_settings = tda10086_get_tune_settings,
 708
 709         .read_status = tda10086_read_status,
 710         .read_ber = tda10086_read_ber,
 711         .read_signal_strength = tda10086_read_signal_strength,
 712         .read_snr = tda10086_read_snr,
 713         .read_ucblocks = tda10086_read_ucblocks,
 714
 715         .diseqc_send_master_cmd = tda10086_send_master_cmd,
 716         .diseqc_send_burst = tda10086_send_burst,
 717         .set_tone = tda10086_set_tone,
 718 };
 719
 720 struct dvb_frontend* tda10086_attach(const struct tda10086_config* config,
 721                                      struct i2c_adapter* i2c)
 722 {
 723         struct tda10086_state *state;
 724
 725         dprintk ("%s\n", __FUNCTION__);
 726
 727         /* allocate memory for the internal state */
 728         state = kmalloc(sizeof(struct tda10086_state), GFP_KERNEL);
 729         if (!state)
 730                 return NULL;
 731
 732         /* setup the state */
 733         state->config = config;
 734         state->i2c = i2c;
 735
 736         /* check if the demod is there */
 737         if (tda10086_read_byte(state, 0x1e) != 0xe1) {
 738                 kfree(state);
 739                 return NULL;
 740         }
 741
 742         /* create dvb_frontend */
 743         memcpy(&state->frontend.ops, &tda10086_ops, sizeof(struct dvb_frontend_ops));
 744         state->frontend.demodulator_priv = state;
 745         return &state->frontend;
 746 }
 747
 748 module_param(debug, int, 0644);
 749 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 750
 751 MODULE_DESCRIPTION("Philips TDA10086 DVB-S Demodulator");
 752 MODULE_AUTHOR("Andrew de Quincey");
 753 MODULE_LICENSE("GPL");
 754
 755 EXPORT_SYMBOL(tda10086_attach);