drivers/media/dvb/frontends/tda80xx.c

   1 /*
   2  * tda80xx.c
   3  *
   4  * Philips TDA8044 / TDA8083 QPSK demodulator driver
   5  *
   6  * Copyright (C) 2001 Felix Domke <tmbinc@elitedvb.net>
   7  * Copyright (C) 2002-2004 Andreas Oberritter <obi@linuxtv.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/config.h>
  25 #include <linux/delay.h>
  26 #include <linux/init.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/threads.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/irq.h>
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/slab.h>
  34 #include <asm/div64.h>
  35
  36 #include "dvb_frontend.h"
  37 #include "tda80xx.h"
  38
  39 enum {
  40         ID_TDA8044 = 0x04,
  41         ID_TDA8083 = 0x05,
  42 };
  43
  44
  45 struct tda80xx_state {
  46
  47         struct i2c_adapter* i2c;
  48
  49         struct dvb_frontend_ops ops;
  50
  51         /* configuration settings */
  52         const struct tda80xx_config* config;
  53
  54         struct dvb_frontend frontend;
  55
  56         u32 clk;
  57         int afc_loop;
  58         struct work_struct worklet;
  59         fe_code_rate_t code_rate;
  60         fe_spectral_inversion_t spectral_inversion;
  61         fe_status_t status;
  62         u8 id;
  63 };
  64
  65 static int debug = 1;
  66 #define dprintk if (debug) printk
  67
  68 static u8 tda8044_inittab_pre[] = {
  69         0x02, 0x00, 0x6f, 0xb5, 0x86, 0x22, 0x00, 0xea,
  70         0x30, 0x42, 0x98, 0x68, 0x70, 0x42, 0x99, 0x58,
  71         0x95, 0x10, 0xf5, 0xe7, 0x93, 0x0b, 0x15, 0x68,
  72         0x9a, 0x90, 0x61, 0x80, 0x00, 0xe0, 0x40, 0x00,
  73         0x0f, 0x15, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  74         0x00, 0x00
  75 };
  76
  77 static u8 tda8044_inittab_post[] = {
  78         0x04, 0x00, 0x6f, 0xb5, 0x86, 0x22, 0x00, 0xea,
  79         0x30, 0x42, 0x98, 0x68, 0x70, 0x42, 0x99, 0x50,
  80         0x95, 0x10, 0xf5, 0xe7, 0x93, 0x0b, 0x15, 0x68,
  81         0x9a, 0x90, 0x61, 0x80, 0x00, 0xe0, 0x40, 0x6c,
  82         0x0f, 0x15, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  83         0x00, 0x00
  84 };
  85
  86 static u8 tda8083_inittab[] = {
  87         0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
  88         0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
  89         0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
  90         0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
  91         0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
  92         0x00, 0x00, 0x00, 0x00
  93 };
  94
  95 static __inline__ u32 tda80xx_div(u32 a, u32 b)
  96 {
  97         return (a + (b / 2)) / b;
  98 }
  99
 100 static __inline__ u32 tda80xx_gcd(u32 a, u32 b)
 101 {
 102         u32 r;
 103
 104         while ((r = a % b)) {
 105                 a = b;
 106                 b = r;
 107         }
 108
 109         return b;
 110 }
 111
 112 static int tda80xx_read(struct tda80xx_state* state, u8 reg, u8 *buf, u8 len)
 113 {
 114         int ret;
 115         struct i2c_msg msg[] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg, .len = 1 },
 116                           { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = buf, .len = len } };
 117
 118         ret = i2c_transfer(state->i2c, msg, 2);
 119
 120         if (ret != 2)
 121                 dprintk("%s: readreg error (reg %02x, ret == %i)\n",
 122                                 __FUNCTION__, reg, ret);
 123
 124         mdelay(10);
 125
 126         return (ret == 2) ? 0 : -EREMOTEIO;
 127 }
 128
 129 static int tda80xx_write(struct tda80xx_state* state, u8 reg, const u8 *buf, u8 len)
 130 {
 131         int ret;
 132         u8 wbuf[len + 1];
 133         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = wbuf, .len = len + 1 };
 134
 135         wbuf[0] = reg;
 136         memcpy(&wbuf[1], buf, len);
 137
 138         ret = i2c_transfer(state->i2c, &msg, 1);
 139
 140         if (ret != 1)
 141                 dprintk("%s: i2c xfer error (ret == %i)\n", __FUNCTION__, ret);
 142
 143         mdelay(10);
 144
 145         return (ret == 1) ? 0 : -EREMOTEIO;
 146 }
 147
 148 static __inline__ u8 tda80xx_readreg(struct tda80xx_state* state, u8 reg)
 149 {
 150         u8 val;
 151
 152         tda80xx_read(state, reg, &val, 1);
 153
 154         return val;
 155 }
 156
 157 static __inline__ int tda80xx_writereg(struct tda80xx_state* state, u8 reg, u8 data)
 158 {
 159         return tda80xx_write(state, reg, &data, 1);
 160 }
 161
 162 static int tda80xx_set_parameters(struct tda80xx_state* state,
 163                                   fe_spectral_inversion_t inversion,
 164                                   u32 symbol_rate,
 165                                   fe_code_rate_t fec_inner)
 166 {
 167         u8 buf[15];
 168         u64 ratio;
 169         u32 clk;
 170         u32 k;
 171         u32 sr = symbol_rate;
 172         u32 gcd;
 173         u8 scd;
 174
 175         if (symbol_rate > (state->clk * 3) / 16)
 176                 scd = 0;
 177         else if (symbol_rate > (state->clk * 3) / 32)
 178                 scd = 1;
 179         else if (symbol_rate > (state->clk * 3) / 64)
 180                 scd = 2;
 181         else
 182                 scd = 3;
 183
 184         clk = scd ? (state->clk / (scd * 2)) : state->clk;
 185
 186         /*
 187          * Viterbi decoder:
 188          * Differential decoding off
 189          * Spectral inversion unknown
 190          * QPSK modulation
 191          */
 192         if (inversion == INVERSION_ON)
 193                 buf[0] = 0x60;
 194         else if (inversion == INVERSION_OFF)
 195                 buf[0] = 0x20;
 196         else
 197                 buf[0] = 0x00;
 198
 199         /*
 200          * CLK ratio:
 201          * system clock frequency is up to 64 or 96 MHz
 202          *
 203          * formula:
 204          * r = k * clk / symbol_rate
 205          *
 206          * k:   2^21 for caa 0..3,
 207          *      2^20 for caa 4..5,
 208          *      2^19 for caa 6..7
 209          */
 210         if (symbol_rate <= (clk * 3) / 32)
 211                 k = (1 << 19);
 212         else if (symbol_rate <= (clk * 3) / 16)
 213                 k = (1 << 20);
 214         else
 215                 k = (1 << 21);
 216
 217         gcd = tda80xx_gcd(clk, sr);
 218         clk /= gcd;
 219         sr /= gcd;
 220
 221         gcd = tda80xx_gcd(k, sr);
 222         k /= gcd;
 223         sr /= gcd;
 224
 225         ratio = (u64)k * (u64)clk;
 226         do_div(ratio, sr);
 227
 228         buf[1] = ratio >> 16;
 229         buf[2] = ratio >> 8;
 230         buf[3] = ratio;
 231
 232         /* nyquist filter roll-off factor 35% */
 233         buf[4] = 0x20;
 234
 235         clk = scd ? (state->clk / (scd * 2)) : state->clk;
 236
 237         /* Anti Alias Filter */
 238         if (symbol_rate < (clk * 3) / 64)
 239                 printk("tda80xx: unsupported symbol rate: %u\n", symbol_rate);
 240         else if (symbol_rate <= clk / 16)
 241                 buf[4] |= 0x07;
 242         else if (symbol_rate <= (clk * 3) / 32)
 243                 buf[4] |= 0x06;
 244         else if (symbol_rate <= clk / 8)
 245                 buf[4] |= 0x05;
 246         else if (symbol_rate <= (clk * 3) / 16)
 247                 buf[4] |= 0x04;
 248         else if (symbol_rate <= clk / 4)
 249                 buf[4] |= 0x03;
 250         else if (symbol_rate <= (clk * 3) / 8)
 251                 buf[4] |= 0x02;
 252         else if (symbol_rate <= clk / 2)
 253                 buf[4] |= 0x01;
 254         else
 255                 buf[4] |= 0x00;
 256
 257         /* Sigma Delta converter */
 258         buf[5] = 0x00;
 259
 260         /* FEC: Possible puncturing rates */
 261         if (fec_inner == FEC_NONE)
 262                 buf[6] = 0x00;
 263         else if ((fec_inner >= FEC_1_2) && (fec_inner <= FEC_8_9))
 264                 buf[6] = (1 << (8 - fec_inner));
 265         else if (fec_inner == FEC_AUTO)
 266                 buf[6] = 0xff;
 267         else
 268                 return -EINVAL;
 269
 270         /* carrier lock detector threshold value */
 271         buf[7] = 0x30;
 272         /* AFC1: proportional part settings */
 273         buf[8] = 0x42;
 274         /* AFC1: integral part settings */
 275         buf[9] = 0x98;
 276         /* PD: Leaky integrator SCPC mode */
 277         buf[10] = 0x28;
 278         /* AFC2, AFC1 controls */
 279         buf[11] = 0x30;
 280         /* PD: proportional part settings */
 281         buf[12] = 0x42;
 282         /* PD: integral part settings */
 283         buf[13] = 0x99;
 284         /* AGC */
 285         buf[14] = 0x50 | scd;
 286
 287         printk("symbol_rate=%u clk=%u\n", symbol_rate, clk);
 288
 289         return tda80xx_write(state, 0x01, buf, sizeof(buf));
 290 }
 291
 292 static int tda80xx_set_clk(struct tda80xx_state* state)
 293 {
 294         u8 buf[2];
 295
 296         /* CLK proportional part */
 297         buf[0] = (0x06 << 5) | 0x08;    /* CMP[2:0], CSP[4:0] */
 298         /* CLK integral part */
 299         buf[1] = (0x04 << 5) | 0x1a;    /* CMI[2:0], CSI[4:0] */
 300
 301         return tda80xx_write(state, 0x17, buf, sizeof(buf));
 302 }
 303
 304 #if 0
 305 static int tda80xx_set_scpc_freq_offset(struct tda80xx_state* state)
 306 {
 307         /* a constant value is nonsense here imho */
 308         return tda80xx_writereg(state, 0x22, 0xf9);
 309 }
 310 #endif
 311
 312 static int tda80xx_close_loop(struct tda80xx_state* state)
 313 {
 314         u8 buf[2];
 315
 316         /* PD: Loop closed, LD: lock detect enable, SCPC: Sweep mode - AFC1 loop closed */
 317         buf[0] = 0x68;
 318         /* AFC1: Loop closed, CAR Feedback: 8192 */
 319         buf[1] = 0x70;
 320
 321         return tda80xx_write(state, 0x0b, buf, sizeof(buf));
 322 }
 323
 324 static irqreturn_t tda80xx_irq(int irq, void *priv, struct pt_regs *pt)
 325 {
 326         schedule_work(priv);
 327
 328         return IRQ_HANDLED;
 329 }
 330
 331 static void tda80xx_read_status_int(struct tda80xx_state* state)
 332 {
 333         u8 val;
 334
 335         static const fe_spectral_inversion_t inv_tab[] = {
 336                 INVERSION_OFF, INVERSION_ON
 337         };
 338
 339         static const fe_code_rate_t fec_tab[] = {
 340                 FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
 341                 FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8,
 342         };
 343
 344         val = tda80xx_readreg(state, 0x02);
 345
 346         state->status = 0;
 347
 348         if (val & 0x01) /* demodulator lock */
 349                 state->status |= FE_HAS_SIGNAL;
 350         if (val & 0x02) /* clock recovery lock */
 351                 state->status |= FE_HAS_CARRIER;
 352         if (val & 0x04) /* viterbi lock */
 353                 state->status |= FE_HAS_VITERBI;
 354         if (val & 0x08) /* deinterleaver lock (packet sync) */
 355                 state->status |= FE_HAS_SYNC;
 356         if (val & 0x10) /* derandomizer lock (frame sync) */
 357                 state->status |= FE_HAS_LOCK;
 358         if (val & 0x20) /* frontend can not lock */
 359                 state->status |= FE_TIMEDOUT;
 360
 361         if ((state->status & (FE_HAS_CARRIER)) && (state->afc_loop)) {
 362                 printk("tda80xx: closing loop\n");
 363                 tda80xx_close_loop(state);
 364                 state->afc_loop = 0;
 365         }
 366
 367         if (state->status & (FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK)) {
 368                 val = tda80xx_readreg(state, 0x0e);
 369                 state->code_rate = fec_tab[val & 0x07];
 370                 if (state->status & (FE_HAS_SYNC | FE_HAS_LOCK))
 371                         state->spectral_inversion = inv_tab[(val >> 7) & 0x01];
 372                 else
 373                         state->spectral_inversion = INVERSION_AUTO;
 374         }
 375         else {
 376                 state->code_rate = FEC_AUTO;
 377         }
 378 }
 379
 380 static void tda80xx_worklet(void *priv)
 381 {
 382         struct tda80xx_state *state = priv;
 383
 384         tda80xx_writereg(state, 0x00, 0x04);
 385         enable_irq(state->config->irq);
 386
 387         tda80xx_read_status_int(state);
 388 }
 389
 390 static void tda80xx_wait_diseqc_fifo(struct tda80xx_state* state)
 391 {
 392         size_t i;
 393
 394         for (i = 0; i < 100; i++) {
 395                 if (tda80xx_readreg(state, 0x02) & 0x80)
 396                         break;
 397                 msleep(10);
 398         }
 399 }
 400
 401 static int tda8044_init(struct dvb_frontend* fe)
 402 {
 403         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 404         int ret;
 405
 406         /*
 407          * this function is a mess...
 408          */
 409
 410         if ((ret = tda80xx_write(state, 0x00, tda8044_inittab_pre, sizeof(tda8044_inittab_pre))))
 411                 return ret;
 412
 413         tda80xx_writereg(state, 0x0f, 0x50);
 414 #if 1
 415         tda80xx_writereg(state, 0x20, 0x8F);            /* FIXME */
 416         tda80xx_writereg(state, 0x20, state->config->volt18setting);    /* FIXME */
 417         //tda80xx_writereg(state, 0x00, 0x04);
 418         tda80xx_writereg(state, 0x00, 0x0C);
 419 #endif
 420         //tda80xx_writereg(state, 0x00, 0x08); /* Reset AFC1 loop filter */
 421
 422         tda80xx_write(state, 0x00, tda8044_inittab_post, sizeof(tda8044_inittab_post));
 423
 424         if (state->config->pll_init) {
 425                 tda80xx_writereg(state, 0x1c, 0x80);
 426                 state->config->pll_init(fe);
 427                 tda80xx_writereg(state, 0x1c, 0x00);
 428         }
 429
 430         return 0;
 431 }
 432
 433 static int tda8083_init(struct dvb_frontend* fe)
 434 {
 435         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 436
 437         tda80xx_write(state, 0x00, tda8083_inittab, sizeof(tda8083_inittab));
 438
 439         if (state->config->pll_init) {
 440                 tda80xx_writereg(state, 0x1c, 0x80);
 441                 state->config->pll_init(fe);
 442                 tda80xx_writereg(state, 0x1c, 0x00);
 443         }
 444
 445         return 0;
 446 }
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463 static int tda80xx_set_voltage(struct dvb_frontend* fe, fe_sec_voltage_t voltage)
 464 {
 465         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 466
 467         switch (voltage) {
 468         case SEC_VOLTAGE_13:
 469                 return tda80xx_writereg(state, 0x20, state->config->volt13setting);
 470         case SEC_VOLTAGE_18:
 471                 return tda80xx_writereg(state, 0x20, state->config->volt18setting);
 472         case SEC_VOLTAGE_OFF:
 473                 return tda80xx_writereg(state, 0x20, 0);
 474         default:
 475                 return -EINVAL;
 476         }
 477 }
 478
 479 static int tda80xx_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 480 {
 481         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 482
 483         switch (tone) {
 484         case SEC_TONE_OFF:
 485                 return tda80xx_writereg(state, 0x29, 0x00);
 486         case SEC_TONE_ON:
 487                 return tda80xx_writereg(state, 0x29, 0x80);
 488         default:
 489                 return -EINVAL;
 490         }
 491 }
 492
 493 static int tda80xx_send_diseqc_msg(struct dvb_frontend* fe, struct dvb_diseqc_master_cmd *cmd)
 494 {
 495         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 496
 497         if (cmd->msg_len > 6)
 498                 return -EINVAL;
 499
 500         tda80xx_writereg(state, 0x29, 0x08 | (cmd->msg_len - 3));
 501         tda80xx_write(state, 0x23, cmd->msg, cmd->msg_len);
 502         tda80xx_writereg(state, 0x29, 0x0c | (cmd->msg_len - 3));
 503         tda80xx_wait_diseqc_fifo(state);
 504
 505         return 0;
 506 }
 507
 508 static int tda80xx_send_diseqc_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t cmd)
 509 {
 510         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 511
 512         switch (cmd) {
 513         case SEC_MINI_A:
 514                 tda80xx_writereg(state, 0x29, 0x14);
 515                 break;
 516         case SEC_MINI_B:
 517                 tda80xx_writereg(state, 0x29, 0x1c);
 518                 break;
 519         default:
 520                 return -EINVAL;
 521         }
 522
 523         tda80xx_wait_diseqc_fifo(state);
 524
 525         return 0;
 526 }
 527
 528 static int tda80xx_sleep(struct dvb_frontend* fe)
 529 {
 530         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 531
 532         tda80xx_writereg(state, 0x00, 0x02);    /* enter standby */
 533
 534         return 0;
 535 }
 536
 537 static int tda80xx_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 538 {
 539         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 540
 541         tda80xx_writereg(state, 0x1c, 0x80);
 542         state->config->pll_set(fe, p);
 543         tda80xx_writereg(state, 0x1c, 0x00);
 544
 545         tda80xx_set_parameters(state, p->inversion, p->u.qpsk.symbol_rate, p->u.qpsk.fec_inner);
 546         tda80xx_set_clk(state);
 547         //tda80xx_set_scpc_freq_offset(state);
 548         state->afc_loop = 1;
 549
 550         return 0;
 551 }
 552
 553 static int tda80xx_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 554 {
 555         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 556
 557         if (!state->config->irq)
 558                 tda80xx_read_status_int(state);
 559
 560         p->inversion = state->spectral_inversion;
 561         p->u.qpsk.fec_inner = state->code_rate;
 562
 563         return 0;
 564 }
 565
 566 static int tda80xx_read_status(struct dvb_frontend* fe, fe_status_t* status)
 567 {
 568         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 569
 570         if (!state->config->irq)
 571                 tda80xx_read_status_int(state);
 572         *status = state->status;
 573
 574         return 0;
 575 }
 576
 577 static int tda80xx_read_ber(struct dvb_frontend* fe, u32* ber)
 578 {
 579         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 580         int ret;
 581         u8 buf[3];
 582
 583         if ((ret = tda80xx_read(state, 0x0b, buf, sizeof(buf))))
 584                 return ret;
 585
 586         *ber = ((buf[0] & 0x1f) << 16) | (buf[1] << 8) | buf[2];
 587
 588         return 0;
 589 }
 590
 591 static int tda80xx_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 592 {
 593         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 594
 595         u8 gain = ~tda80xx_readreg(state, 0x01);
 596         *strength = (gain << 8) | gain;
 597
 598         return 0;
 599 }
 600
 601 static int tda80xx_read_snr(struct dvb_frontend* fe, u16* snr)
 602 {
 603         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 604
 605         u8 quality = tda80xx_readreg(state, 0x08);
 606         *snr = (quality << 8) | quality;
 607
 608         return 0;
 609 }
 610
 611 static int tda80xx_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 612 {
 613         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 614
 615         *ucblocks = tda80xx_readreg(state, 0x0f);
 616         if (*ucblocks == 0xff)
 617                 *ucblocks = 0xffffffff;
 618
 619         return 0;
 620 }
 621
 622 static int tda80xx_init(struct dvb_frontend* fe)
 623 {
 624         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 625
 626         switch(state->id) {
 627         case ID_TDA8044:
 628                 return tda8044_init(fe);
 629
 630         case ID_TDA8083:
 631                 return tda8083_init(fe);
 632         }
 633         return 0;
 634 }
 635
 636 static void tda80xx_release(struct dvb_frontend* fe)
 637 {
 638         struct tda80xx_state* state = (struct tda80xx_state*) fe->demodulator_priv;
 639
 640         if (state->config->irq)
 641                 free_irq(state->config->irq, &state->worklet);
 642
 643         kfree(state);
 644 }
 645
 646 static struct dvb_frontend_ops tda80xx_ops;
 647
 648 struct dvb_frontend* tda80xx_attach(const struct tda80xx_config* config,
 649                                     struct i2c_adapter* i2c)
 650 {
 651         struct tda80xx_state* state = NULL;
 652         int ret;
 653
 654         /* allocate memory for the internal state */
 655         state = (struct tda80xx_state*) kmalloc(sizeof(struct tda80xx_state), GFP_KERNEL);
 656         if (state == NULL) goto error;
 657
 658         /* setup the state */
 659         state->config = config;
 660         state->i2c = i2c;
 661         memcpy(&state->ops, &tda80xx_ops, sizeof(struct dvb_frontend_ops));
 662         state->spectral_inversion = INVERSION_AUTO;
 663         state->code_rate = FEC_AUTO;
 664         state->status = 0;
 665         state->afc_loop = 0;
 666
 667         /* check if the demod is there */
 668         if (tda80xx_writereg(state, 0x89, 0x00) < 0) goto error;
 669         state->id = tda80xx_readreg(state, 0x00);
 670
 671         switch (state->id) {
 672         case ID_TDA8044:
 673                 state->clk = 96000000;
 674                 printk("tda80xx: Detected tda8044\n");
 675                 break;
 676
 677         case ID_TDA8083:
 678                 state->clk = 64000000;
 679                 printk("tda80xx: Detected tda8083\n");
 680                 break;
 681
 682         default:
 683                 goto error;
 684         }
 685
 686         /* setup IRQ */
 687         if (state->config->irq) {
 688                 INIT_WORK(&state->worklet, tda80xx_worklet, state);
 689                 if ((ret = request_irq(state->config->irq, tda80xx_irq, SA_ONESHOT, "tda80xx", &state->worklet)) < 0) {
 690                         printk(KERN_ERR "tda80xx: request_irq failed (%d)\n", ret);
 691                         goto error;
 692                 }
 693         }
 694
 695         /* create dvb_frontend */
 696         state->frontend.ops = &state->ops;
 697         state->frontend.demodulator_priv = state;
 698         return &state->frontend;
 699
 700 error:
 701         if (state) kfree(state);
 702         return NULL;
 703 }
 704
 705 static struct dvb_frontend_ops tda80xx_ops = {
 706
 707         .info = {
 708                 .name = "Philips TDA80xx DVB-S",
 709                 .type = FE_QPSK,
 710                 .frequency_min = 500000,
 711                 .frequency_max = 2700000,
 712                 .frequency_stepsize = 125,
 713                 .symbol_rate_min = 4500000,
 714                 .symbol_rate_max = 45000000,
 715                 .caps = FE_CAN_INVERSION_AUTO |
 716                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 717                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 718                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 719                         FE_CAN_QPSK |
 720                         FE_CAN_MUTE_TS
 721         },
 722
 723         .release = tda80xx_release,
 724
 725         .init = tda80xx_init,
 726         .sleep = tda80xx_sleep,
 727
 728         .set_frontend = tda80xx_set_frontend,
 729         .get_frontend = tda80xx_get_frontend,
 730
 731         .read_status = tda80xx_read_status,
 732         .read_ber = tda80xx_read_ber,
 733         .read_signal_strength = tda80xx_read_signal_strength,
 734         .read_snr = tda80xx_read_snr,
 735         .read_ucblocks = tda80xx_read_ucblocks,
 736
 737         .diseqc_send_master_cmd = tda80xx_send_diseqc_msg,
 738         .diseqc_send_burst = tda80xx_send_diseqc_burst,
 739         .set_tone = tda80xx_set_tone,
 740         .set_voltage = tda80xx_set_voltage,
 741 };
 742
 743 module_param(debug, int, 0644);
 744
 745 MODULE_DESCRIPTION("Philips TDA8044 / TDA8083 DVB-S Demodulator driver");
 746 MODULE_AUTHOR("Felix Domke, Andreas Oberritter");
 747 MODULE_LICENSE("GPL");
 748
 749 EXPORT_SYMBOL(tda80xx_attach);