drivers/media/dvb/frontends/cx24110.c

   1 /*
   2     cx24110 - Single Chip Satellite Channel Receiver driver module
   3
   4     Copyright (C) 2002 Peter Hettkamp <peter.hettkamp@t-online.de> based on
   5     work
   6     Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16
  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
  25 #include <linux/slab.h>
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/moduleparam.h>
  29 #include <linux/init.h>
  30
  31 #include "dvb_frontend.h"
  32 #include "cx24110.h"
  33
  34
  35 struct cx24110_state {
  36
  37         struct i2c_adapter* i2c;
  38
  39         struct dvb_frontend_ops ops;
  40
  41         const struct cx24110_config* config;
  42
  43         struct dvb_frontend frontend;
  44
  45         u32 lastber;
  46         u32 lastbler;
  47         u32 lastesn0;
  48 };
  49
  50 static int debug;
  51 #define dprintk(args...) \
  52         do { \
  53                 if (debug) printk(KERN_DEBUG "cx24110: " args); \
  54         } while (0)
  55
  56 static struct {u8 reg; u8 data;} cx24110_regdata[]=
  57                       /* Comments beginning with @ denote this value should
  58                          be the default */
  59         {{0x09,0x01}, /* SoftResetAll */
  60          {0x09,0x00}, /* release reset */
  61          {0x01,0xe8}, /* MSB of code rate 27.5MS/s */
  62          {0x02,0x17}, /* middle byte " */
  63          {0x03,0x29}, /* LSB         " */
  64          {0x05,0x03}, /* @ DVB mode, standard code rate 3/4 */
  65          {0x06,0xa5}, /* @ PLL 60MHz */
  66          {0x07,0x01}, /* @ Fclk, i.e. sampling clock, 60MHz */
  67          {0x0a,0x00}, /* @ partial chip disables, do not set */
  68          {0x0b,0x01}, /* set output clock in gapped mode, start signal low
  69                          active for first byte */
  70          {0x0c,0x11}, /* no parity bytes, large hold time, serial data out */
  71          {0x0d,0x6f}, /* @ RS Sync/Unsync thresholds */
  72          {0x10,0x40}, /* chip doc is misleading here: write bit 6 as 1
  73                          to avoid starting the BER counter. Reset the
  74                          CRC test bit. Finite counting selected */
  75          {0x15,0xff}, /* @ size of the limited time window for RS BER
  76                          estimation. It is <value>*256 RS blocks, this
  77                          gives approx. 2.6 sec at 27.5MS/s, rate 3/4 */
  78          {0x16,0x00}, /* @ enable all RS output ports */
  79          {0x17,0x04}, /* @ time window allowed for the RS to sync */
  80          {0x18,0xae}, /* @ allow all standard DVB code rates to be scanned
  81                          for automatically */
  82                       /* leave the current code rate and normalization
  83                          registers as they are after reset... */
  84          {0x21,0x10}, /* @ during AutoAcq, search each viterbi setting
  85                          only once */
  86          {0x23,0x18}, /* @ size of the limited time window for Viterbi BER
  87                          estimation. It is <value>*65536 channel bits, i.e.
  88                          approx. 38ms at 27.5MS/s, rate 3/4 */
  89          {0x24,0x24}, /* do not trigger Viterbi CRC test. Finite count window */
  90                       /* leave front-end AGC parameters at default values */
  91                       /* leave decimation AGC parameters at default values */
  92          {0x35,0x40}, /* disable all interrupts. They are not connected anyway */
  93          {0x36,0xff}, /* clear all interrupt pending flags */
  94          {0x37,0x00}, /* @ fully enable AutoAcqq state machine */
  95          {0x38,0x07}, /* @ enable fade recovery, but not autostart AutoAcq */
  96                       /* leave the equalizer parameters on their default values */
  97                       /* leave the final AGC parameters on their default values */
  98          {0x41,0x00}, /* @ MSB of front-end derotator frequency */
  99          {0x42,0x00}, /* @ middle bytes " */
 100          {0x43,0x00}, /* @ LSB          " */
 101                       /* leave the carrier tracking loop parameters on default */
 102                       /* leave the bit timing loop parameters at gefault */
 103          {0x56,0x4d}, /* set the filtune voltage to 2.7V, as recommended by */
 104                       /* the cx24108 data sheet for symbol rates above 15MS/s */
 105          {0x57,0x00}, /* @ Filter sigma delta enabled, positive */
 106          {0x61,0x95}, /* GPIO pins 1-4 have special function */
 107          {0x62,0x05}, /* GPIO pin 5 has special function, pin 6 is GPIO */
 108          {0x63,0x00}, /* All GPIO pins use CMOS output characteristics */
 109          {0x64,0x20}, /* GPIO 6 is input, all others are outputs */
 110          {0x6d,0x30}, /* tuner auto mode clock freq 62kHz */
 111          {0x70,0x15}, /* use auto mode, tuner word is 21 bits long */
 112          {0x73,0x00}, /* @ disable several demod bypasses */
 113          {0x74,0x00}, /* @  " */
 114          {0x75,0x00}  /* @  " */
 115                       /* the remaining registers are for SEC */
 116         };
 117
 118
 119 static int cx24110_writereg (struct cx24110_state* state, int reg, int data)
 120 {
 121         u8 buf [] = { reg, data };
 122         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
 123         int err;
 124
 125         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
 126                 dprintk ("%s: writereg error (err == %i, reg == 0x%02x,"
 127                          " data == 0x%02x)\n", __FUNCTION__, err, reg, data);
 128                 return -EREMOTEIO;
 129         }
 130
 131         return 0;
 132 }
 133
 134 static int cx24110_readreg (struct cx24110_state* state, u8 reg)
 135 {
 136         int ret;
 137         u8 b0 [] = { reg };
 138         u8 b1 [] = { 0 };
 139         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
 140                            { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
 141
 142         ret = i2c_transfer(state->i2c, msg, 2);
 143
 144         if (ret != 2) return ret;
 145
 146         return b1[0];
 147 }
 148
 149 static int cx24110_set_inversion (struct cx24110_state* state, fe_spectral_inversion_t inversion)
 150 {
 151 /* fixme (low): error handling */
 152
 153         switch (inversion) {
 154         case INVERSION_OFF:
 155                 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)|0x1);
 156                 /* AcqSpectrInvDis on. No idea why someone should want this */
 157                 cx24110_writereg(state,0x5,cx24110_readreg(state,0x5)&0xf7);
 158                 /* Initial value 0 at start of acq */
 159                 cx24110_writereg(state,0x22,cx24110_readreg(state,0x22)&0xef);
 160                 /* current value 0 */
 161                 /* The cx24110 manual tells us this reg is read-only.
 162                    But what the heck... set it ayways */
 163                 break;
 164         case INVERSION_ON:
 165                 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)|0x1);
 166                 /* AcqSpectrInvDis on. No idea why someone should want this */
 167                 cx24110_writereg(state,0x5,cx24110_readreg(state,0x5)|0x08);
 168                 /* Initial value 1 at start of acq */
 169                 cx24110_writereg(state,0x22,cx24110_readreg(state,0x22)|0x10);
 170                 /* current value 1 */
 171                 break;
 172         case INVERSION_AUTO:
 173                 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)&0xfe);
 174                 /* AcqSpectrInvDis off. Leave initial & current states as is */
 175                 break;
 176         default:
 177                 return -EINVAL;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static int cx24110_set_fec (struct cx24110_state* state, fe_code_rate_t fec)
 184 {
 185 /* fixme (low): error handling */
 186
 187         static const int rate[]={-1,1,2,3,5,7,-1};
 188         static const int g1[]={-1,0x01,0x02,0x05,0x15,0x45,-1};
 189         static const int g2[]={-1,0x01,0x03,0x06,0x1a,0x7a,-1};
 190
 191         /* Well, the AutoAcq engine of the cx24106 and 24110 automatically
 192            searches all enabled viterbi rates, and can handle non-standard
 193            rates as well. */
 194
 195         if (fec>FEC_AUTO)
 196                 fec=FEC_AUTO;
 197
 198         if (fec==FEC_AUTO) { /* (re-)establish AutoAcq behaviour */
 199                 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)&0xdf);
 200                 /* clear AcqVitDis bit */
 201                 cx24110_writereg(state,0x18,0xae);
 202                 /* allow all DVB standard code rates */
 203                 cx24110_writereg(state,0x05,(cx24110_readreg(state,0x05)&0xf0)|0x3);
 204                 /* set nominal Viterbi rate 3/4 */
 205                 cx24110_writereg(state,0x22,(cx24110_readreg(state,0x22)&0xf0)|0x3);
 206                 /* set current Viterbi rate 3/4 */
 207                 cx24110_writereg(state,0x1a,0x05); cx24110_writereg(state,0x1b,0x06);
 208                 /* set the puncture registers for code rate 3/4 */
 209                 return 0;
 210         } else {
 211                 cx24110_writereg(state,0x37,cx24110_readreg(state,0x37)|0x20);
 212                 /* set AcqVitDis bit */
 213                 if(rate[fec]>0) {
 214                         cx24110_writereg(state,0x05,(cx24110_readreg(state,0x05)&0xf0)|rate[fec]);
 215                         /* set nominal Viterbi rate */
 216                         cx24110_writereg(state,0x22,(cx24110_readreg(state,0x22)&0xf0)|rate[fec]);
 217                         /* set current Viterbi rate */
 218                         cx24110_writereg(state,0x1a,g1[fec]);
 219                         cx24110_writereg(state,0x1b,g2[fec]);
 220                         /* not sure if this is the right way: I always used AutoAcq mode */
 221            } else
 222                    return -EOPNOTSUPP;
 223 /* fixme (low): which is the correct return code? */
 224         };
 225         return 0;
 226 }
 227
 228 static fe_code_rate_t cx24110_get_fec (struct cx24110_state* state)
 229 {
 230         int i;
 231
 232         i=cx24110_readreg(state,0x22)&0x0f;
 233         if(!(i&0x08)) {
 234                 return FEC_1_2 + i - 1;
 235         } else {
 236 /* fixme (low): a special code rate has been selected. In theory, we need to
 237    return a denominator value, a numerator value, and a pair of puncture
 238    maps to correctly describe this mode. But this should never happen in
 239    practice, because it cannot be set by cx24110_get_fec. */
 240            return FEC_NONE;
 241         }
 242 }
 243
 244 static int cx24110_set_symbolrate (struct cx24110_state* state, u32 srate)
 245 {
 246 /* fixme (low): add error handling */
 247         u32 ratio;
 248         u32 tmp, fclk, BDRI;
 249
 250         static const u32 bands[]={5000000UL,15000000UL,90999000UL/2};
 251         int i;
 252
 253 dprintk("cx24110 debug: entering %s(%d)\n",__FUNCTION__,srate);
 254         if (srate>90999000UL/2)
 255                 srate=90999000UL/2;
 256         if (srate<500000)
 257                 srate=500000;
 258
 259         for(i=0;(i<sizeof(bands)/sizeof(bands[0]))&&(srate>bands[i]);i++)
 260                 ;
 261         /* first, check which sample rate is appropriate: 45, 60 80 or 90 MHz,
 262            and set the PLL accordingly (R07[1:0] Fclk, R06[7:4] PLLmult,
 263            R06[3:0] PLLphaseDetGain */
 264         tmp=cx24110_readreg(state,0x07)&0xfc;
 265         if(srate<90999000UL/4) { /* sample rate 45MHz*/
 266                 cx24110_writereg(state,0x07,tmp);
 267                 cx24110_writereg(state,0x06,0x78);
 268                 fclk=90999000UL/2;
 269         } else if(srate<60666000UL/2) { /* sample rate 60MHz */
 270                 cx24110_writereg(state,0x07,tmp|0x1);
 271                 cx24110_writereg(state,0x06,0xa5);
 272                 fclk=60666000UL;
 273         } else if(srate<80888000UL/2) { /* sample rate 80MHz */
 274                 cx24110_writereg(state,0x07,tmp|0x2);
 275                 cx24110_writereg(state,0x06,0x87);
 276                 fclk=80888000UL;
 277         } else { /* sample rate 90MHz */
 278                 cx24110_writereg(state,0x07,tmp|0x3);
 279                 cx24110_writereg(state,0x06,0x78);
 280                 fclk=90999000UL;
 281         };
 282         dprintk("cx24110 debug: fclk %d Hz\n",fclk);
 283         /* we need to divide two integers with approx. 27 bits in 32 bit
 284            arithmetic giving a 25 bit result */
 285         /* the maximum dividend is 90999000/2, 0x02b6446c, this number is
 286            also the most complex divisor. Hence, the dividend has,
 287            assuming 32bit unsigned arithmetic, 6 clear bits on top, the
 288            divisor 2 unused bits at the bottom. Also, the quotient is
 289            always less than 1/2. Borrowed from VES1893.c, of course */
 290
 291         tmp=srate<<6;
 292         BDRI=fclk>>2;
 293         ratio=(tmp/BDRI);
 294
 295         tmp=(tmp%BDRI)<<8;
 296         ratio=(ratio<<8)+(tmp/BDRI);
 297
 298         tmp=(tmp%BDRI)<<8;
 299         ratio=(ratio<<8)+(tmp/BDRI);
 300
 301         tmp=(tmp%BDRI)<<1;
 302         ratio=(ratio<<1)+(tmp/BDRI);
 303
 304         dprintk("srate= %d (range %d, up to %d)\n", srate,i,bands[i]);
 305         dprintk("fclk = %d\n", fclk);
 306         dprintk("ratio= %08x\n", ratio);
 307
 308         cx24110_writereg(state, 0x1, (ratio>>16)&0xff);
 309         cx24110_writereg(state, 0x2, (ratio>>8)&0xff);
 310         cx24110_writereg(state, 0x3, (ratio)&0xff);
 311
 312         return 0;
 313
 314 }
 315
 316 int cx24110_pll_write (struct dvb_frontend* fe, u32 data)
 317 {
 318         struct cx24110_state *state = fe->demodulator_priv;
 319
 320 /* tuner data is 21 bits long, must be left-aligned in data */
 321 /* tuner cx24108 is written through a dedicated 3wire interface on the demod chip */
 322 /* FIXME (low): add error handling, avoid infinite loops if HW fails... */
 323
 324         dprintk("cx24110 debug: cx24108_write(%8.8x)\n",data);
 325
 326         cx24110_writereg(state,0x6d,0x30); /* auto mode at 62kHz */
 327         cx24110_writereg(state,0x70,0x15); /* auto mode 21 bits */
 328
 329         /* if the auto tuner writer is still busy, clear it out */
 330         while (cx24110_readreg(state,0x6d)&0x80)
 331                 cx24110_writereg(state,0x72,0);
 332
 333         /* write the topmost 8 bits */
 334         cx24110_writereg(state,0x72,(data>>24)&0xff);
 335
 336         /* wait for the send to be completed */
 337         while ((cx24110_readreg(state,0x6d)&0xc0)==0x80)
 338                 ;
 339
 340         /* send another 8 bytes */
 341         cx24110_writereg(state,0x72,(data>>16)&0xff);
 342         while ((cx24110_readreg(state,0x6d)&0xc0)==0x80)
 343                 ;
 344
 345         /* and the topmost 5 bits of this byte */
 346         cx24110_writereg(state,0x72,(data>>8)&0xff);
 347         while ((cx24110_readreg(state,0x6d)&0xc0)==0x80)
 348                 ;
 349
 350         /* now strobe the enable line once */
 351         cx24110_writereg(state,0x6d,0x32);
 352         cx24110_writereg(state,0x6d,0x30);
 353
 354         return 0;
 355 }
 356
 357 static int cx24110_initfe(struct dvb_frontend* fe)
 358 {
 359         struct cx24110_state *state = fe->demodulator_priv;
 360 /* fixme (low): error handling */
 361         int i;
 362
 363         dprintk("%s: init chip\n", __FUNCTION__);
 364
 365         for(i=0;i<sizeof(cx24110_regdata)/sizeof(cx24110_regdata[0]);i++) {
 366                 cx24110_writereg(state, cx24110_regdata[i].reg, cx24110_regdata[i].data);
 367         };
 368
 369         if (state->config->pll_init) state->config->pll_init(fe);
 370
 371         return 0;
 372 }
 373
 374 static int cx24110_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
 375 {
 376         struct cx24110_state *state = fe->demodulator_priv;
 377
 378         switch (voltage) {
 379         case SEC_VOLTAGE_13:
 380                 return cx24110_writereg(state,0x76,(cx24110_readreg(state,0x76)&0x3b)|0xc0);
 381         case SEC_VOLTAGE_18:
 382                 return cx24110_writereg(state,0x76,(cx24110_readreg(state,0x76)&0x3b)|0x40);
 383         default:
 384                 return -EINVAL;
 385         };
 386 }
 387
 388 static int cx24110_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
 389 {
 390         int rv, bit, i;
 391         struct cx24110_state *state = fe->demodulator_priv;
 392
 393         if (burst == SEC_MINI_A)
 394                 bit = 0x00;
 395         else if (burst == SEC_MINI_B)
 396                 bit = 0x08;
 397         else
 398                 return -EINVAL;
 399
 400         rv = cx24110_readreg(state, 0x77);
 401         cx24110_writereg(state, 0x77, rv|0x04);
 402
 403         rv = cx24110_readreg(state, 0x76);
 404         cx24110_writereg(state, 0x76, ((rv & 0x90) | 0x40 | bit));
 405         for (i = 500; i-- > 0 && !(cx24110_readreg(state,0x76)&0x40) ; )
 406               ; /* wait for LNB ready */
 407
 408         return 0;
 409 }
 410
 411 static int cx24110_send_diseqc_msg(struct dvb_frontend* fe,
 412                                    struct dvb_diseqc_master_cmd *cmd)
 413 {
 414         int i, rv;
 415         struct cx24110_state *state = fe->demodulator_priv;
 416
 417         for (i = 0; i < cmd->msg_len; i++)
 418                 cx24110_writereg(state, 0x79 + i, cmd->msg[i]);
 419
 420         rv = cx24110_readreg(state, 0x77);
 421         cx24110_writereg(state, 0x77, rv|0x04);
 422
 423         rv = cx24110_readreg(state, 0x76);
 424
 425         cx24110_writereg(state, 0x76, ((rv & 0x90) | 0x40) | ((cmd->msg_len-3) & 3));
 426         for (i=500; i-- > 0 && !(cx24110_readreg(state,0x76)&0x40);)
 427                 ; /* wait for LNB ready */
 428
 429         return 0;
 430 }
 431
 432 static int cx24110_read_status(struct dvb_frontend* fe, fe_status_t* status)
 433 {
 434         struct cx24110_state *state = fe->demodulator_priv;
 435
 436         int sync = cx24110_readreg (state, 0x55);
 437
 438         *status = 0;
 439
 440         if (sync & 0x10)
 441                 *status |= FE_HAS_SIGNAL;
 442
 443         if (sync & 0x08)
 444                 *status |= FE_HAS_CARRIER;
 445
 446         sync = cx24110_readreg (state, 0x08);
 447
 448         if (sync & 0x40)
 449                 *status |= FE_HAS_VITERBI;
 450
 451         if (sync & 0x20)
 452                 *status |= FE_HAS_SYNC;
 453
 454         if ((sync & 0x60) == 0x60)
 455                 *status |= FE_HAS_LOCK;
 456
 457         return 0;
 458 }
 459
 460 static int cx24110_read_ber(struct dvb_frontend* fe, u32* ber)
 461 {
 462         struct cx24110_state *state = fe->demodulator_priv;
 463
 464         /* fixme (maybe): value range is 16 bit. Scale? */
 465         if(cx24110_readreg(state,0x24)&0x10) {
 466                 /* the Viterbi error counter has finished one counting window */
 467                 cx24110_writereg(state,0x24,0x04); /* select the ber reg */
 468                 state->lastber=cx24110_readreg(state,0x25)|
 469                         (cx24110_readreg(state,0x26)<<8);
 470                 cx24110_writereg(state,0x24,0x04); /* start new count window */
 471                 cx24110_writereg(state,0x24,0x14);
 472         }
 473         *ber = state->lastber;
 474
 475         return 0;
 476 }
 477
 478 static int cx24110_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 479 {
 480         struct cx24110_state *state = fe->demodulator_priv;
 481
 482 /* no provision in hardware. Read the frontend AGC accumulator. No idea how to scale this, but I know it is 2s complement */
 483         u8 signal = cx24110_readreg (state, 0x27)+128;
 484         *signal_strength = (signal << 8) | signal;
 485
 486         return 0;
 487 }
 488
 489 static int cx24110_read_snr(struct dvb_frontend* fe, u16* snr)
 490 {
 491         struct cx24110_state *state = fe->demodulator_priv;
 492
 493         /* no provision in hardware. Can be computed from the Es/N0 estimator, but I don't know how. */
 494         if(cx24110_readreg(state,0x6a)&0x80) {
 495                 /* the Es/N0 error counter has finished one counting window */
 496                 state->lastesn0=cx24110_readreg(state,0x69)|
 497                         (cx24110_readreg(state,0x68)<<8);
 498                 cx24110_writereg(state,0x6a,0x84); /* start new count window */
 499         }
 500         *snr = state->lastesn0;
 501
 502         return 0;
 503 }
 504
 505 static int cx24110_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 506 {
 507         struct cx24110_state *state = fe->demodulator_priv;
 508         u32 lastbyer;
 509
 510         if(cx24110_readreg(state,0x10)&0x40) {
 511                 /* the RS error counter has finished one counting window */
 512                 cx24110_writereg(state,0x10,0x60); /* select the byer reg */
 513                 lastbyer=cx24110_readreg(state,0x12)|
 514                         (cx24110_readreg(state,0x13)<<8)|
 515                         (cx24110_readreg(state,0x14)<<16);
 516                 cx24110_writereg(state,0x10,0x70); /* select the bler reg */
 517                 state->lastbler=cx24110_readreg(state,0x12)|
 518                         (cx24110_readreg(state,0x13)<<8)|
 519                         (cx24110_readreg(state,0x14)<<16);
 520                 cx24110_writereg(state,0x10,0x20); /* start new count window */
 521         }
 522         *ucblocks = state->lastbler;
 523
 524         return 0;
 525 }
 526
 527 static int cx24110_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 528 {
 529         struct cx24110_state *state = fe->demodulator_priv;
 530
 531         state->config->pll_set(fe, p);
 532         cx24110_set_inversion (state, p->inversion);
 533         cx24110_set_fec (state, p->u.qpsk.fec_inner);
 534         cx24110_set_symbolrate (state, p->u.qpsk.symbol_rate);
 535         cx24110_writereg(state,0x04,0x05); /* start aquisition */
 536
 537         return 0;
 538 }
 539
 540 static int cx24110_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 541 {
 542         struct cx24110_state *state = fe->demodulator_priv;
 543         s32 afc; unsigned sclk;
 544
 545 /* cannot read back tuner settings (freq). Need to have some private storage */
 546
 547         sclk = cx24110_readreg (state, 0x07) & 0x03;
 548 /* ok, real AFC (FEDR) freq. is afc/2^24*fsamp, fsamp=45/60/80/90MHz.
 549  * Need 64 bit arithmetic. Is thiss possible in the kernel? */
 550         if (sclk==0) sclk=90999000L/2L;
 551         else if (sclk==1) sclk=60666000L;
 552         else if (sclk==2) sclk=80888000L;
 553         else sclk=90999000L;
 554         sclk>>=8;
 555         afc = sclk*(cx24110_readreg (state, 0x44)&0x1f)+
 556               ((sclk*cx24110_readreg (state, 0x45))>>8)+
 557               ((sclk*cx24110_readreg (state, 0x46))>>16);
 558
 559         p->frequency += afc;
 560         p->inversion = (cx24110_readreg (state, 0x22) & 0x10) ?
 561                                 INVERSION_ON : INVERSION_OFF;
 562         p->u.qpsk.fec_inner = cx24110_get_fec (state);
 563
 564         return 0;
 565 }
 566
 567 static int cx24110_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 568 {
 569         struct cx24110_state *state = fe->demodulator_priv;
 570
 571         return cx24110_writereg(state,0x76,(cx24110_readreg(state,0x76)&~0x10)|(((tone==SEC_TONE_ON))?0x10:0));
 572 }
 573
 574 static void cx24110_release(struct dvb_frontend* fe)
 575 {
 576         struct cx24110_state* state = fe->demodulator_priv;
 577         kfree(state);
 578 }
 579
 580 static struct dvb_frontend_ops cx24110_ops;
 581
 582 struct dvb_frontend* cx24110_attach(const struct cx24110_config* config,
 583                                     struct i2c_adapter* i2c)
 584 {
 585         struct cx24110_state* state = NULL;
 586         int ret;
 587
 588         /* allocate memory for the internal state */
 589         state = kmalloc(sizeof(struct cx24110_state), GFP_KERNEL);
 590         if (state == NULL) goto error;
 591
 592         /* setup the state */
 593         state->config = config;
 594         state->i2c = i2c;
 595         memcpy(&state->ops, &cx24110_ops, sizeof(struct dvb_frontend_ops));
 596         state->lastber = 0;
 597         state->lastbler = 0;
 598         state->lastesn0 = 0;
 599
 600         /* check if the demod is there */
 601         ret = cx24110_readreg(state, 0x00);
 602         if ((ret != 0x5a) && (ret != 0x69)) goto error;
 603
 604         /* create dvb_frontend */
 605         state->frontend.ops = &state->ops;
 606         state->frontend.demodulator_priv = state;
 607         return &state->frontend;
 608
 609 error:
 610         kfree(state);
 611         return NULL;
 612 }
 613
 614 static struct dvb_frontend_ops cx24110_ops = {
 615
 616         .info = {
 617                 .name = "Conexant CX24110 DVB-S",
 618                 .type = FE_QPSK,
 619                 .frequency_min = 950000,
 620                 .frequency_max = 2150000,
 621                 .frequency_stepsize = 1011,  /* kHz for QPSK frontends */
 622                 .frequency_tolerance = 29500,
 623                 .symbol_rate_min = 1000000,
 624                 .symbol_rate_max = 45000000,
 625                 .caps = FE_CAN_INVERSION_AUTO |
 626                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 627                         FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 628                         FE_CAN_QPSK | FE_CAN_RECOVER
 629         },
 630
 631         .release = cx24110_release,
 632
 633         .init = cx24110_initfe,
 634         .set_frontend = cx24110_set_frontend,
 635         .get_frontend = cx24110_get_frontend,
 636         .read_status = cx24110_read_status,
 637         .read_ber = cx24110_read_ber,
 638         .read_signal_strength = cx24110_read_signal_strength,
 639         .read_snr = cx24110_read_snr,
 640         .read_ucblocks = cx24110_read_ucblocks,
 641
 642         .diseqc_send_master_cmd = cx24110_send_diseqc_msg,
 643         .set_tone = cx24110_set_tone,
 644         .set_voltage = cx24110_set_voltage,
 645         .diseqc_send_burst = cx24110_diseqc_send_burst,
 646 };
 647
 648 module_param(debug, int, 0644);
 649 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 650
 651 MODULE_DESCRIPTION("Conexant CX24110 DVB-S Demodulator driver");
 652 MODULE_AUTHOR("Peter Hettkamp");
 653 MODULE_LICENSE("GPL");
 654
 655 EXPORT_SYMBOL(cx24110_attach);
 656 EXPORT_SYMBOL(cx24110_pll_write);