drivers/media/dvb-frontends/m88rs2000.c

   1 /*
   2         Driver for M88RS2000 demodulator and tuner
   3
   4         Copyright (C) 2012 Malcolm Priestley (tvboxspy@gmail.com)
   5         Beta Driver
   6
   7         Include various calculation code from DS3000 driver.
   8         Copyright (C) 2009 Konstantin Dimitrov.
   9
  10         This program is free software; you can redistribute it and/or modify
  11         it under the terms of the GNU General Public License as published by
  12         the Free Software Foundation; either version 2 of the License, or
  13         (at your option) any later version.
  14
  15         This program is distributed in the hope that it will be useful,
  16         but WITHOUT ANY WARRANTY; without even the implied warranty of
  17         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18         GNU General Public License for more details.
  19
  20         You should have received a copy of the GNU General Public License
  21         along with this program; if not, write to the Free Software
  22         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 */
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/string.h>
  30 #include <linux/slab.h>
  31 #include <linux/types.h>
  32
  33
  34 #include "dvb_frontend.h"
  35 #include "m88rs2000.h"
  36
  37 struct m88rs2000_state {
  38         struct i2c_adapter *i2c;
  39         const struct m88rs2000_config *config;
  40         struct dvb_frontend frontend;
  41         u8 no_lock_count;
  42         u32 tuner_frequency;
  43         u32 symbol_rate;
  44         fe_code_rate_t fec_inner;
  45         u8 tuner_level;
  46         int errmode;
  47 };
  48
  49 static int m88rs2000_debug;
  50
  51 module_param_named(debug, m88rs2000_debug, int, 0644);
  52 MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
  53
  54 #define dprintk(level, args...) do { \
  55         if (level & m88rs2000_debug) \
  56                 printk(KERN_DEBUG "m88rs2000-fe: " args); \
  57 } while (0)
  58
  59 #define deb_info(args...)  dprintk(0x01, args)
  60 #define info(format, arg...) \
  61         printk(KERN_INFO "m88rs2000-fe: " format "\n" , ## arg)
  62
  63 static int m88rs2000_writereg(struct m88rs2000_state *state,
  64         u8 reg, u8 data)
  65 {
  66         int ret;
  67         u8 buf[] = { reg, data };
  68         struct i2c_msg msg = {
  69                 .addr = state->config->demod_addr,
  70                 .flags = 0,
  71                 .buf = buf,
  72                 .len = 2
  73         };
  74
  75         ret = i2c_transfer(state->i2c, &msg, 1);
  76
  77         if (ret != 1)
  78                 deb_info("%s: writereg error (reg == 0x%02x, val == 0x%02x, "
  79                         "ret == %i)\n", __func__, reg, data, ret);
  80
  81         return (ret != 1) ? -EREMOTEIO : 0;
  82 }
  83
  84 static u8 m88rs2000_readreg(struct m88rs2000_state *state, u8 reg)
  85 {
  86         int ret;
  87         u8 b0[] = { reg };
  88         u8 b1[] = { 0 };
  89
  90         struct i2c_msg msg[] = {
  91                 {
  92                         .addr = state->config->demod_addr,
  93                         .flags = 0,
  94                         .buf = b0,
  95                         .len = 1
  96                 }, {
  97                         .addr = state->config->demod_addr,
  98                         .flags = I2C_M_RD,
  99                         .buf = b1,
 100                         .len = 1
 101                 }
 102         };
 103
 104         ret = i2c_transfer(state->i2c, msg, 2);
 105
 106         if (ret != 2)
 107                 deb_info("%s: readreg error (reg == 0x%02x, ret == %i)\n",
 108                                 __func__, reg, ret);
 109
 110         return b1[0];
 111 }
 112
 113 static u32 m88rs2000_get_mclk(struct dvb_frontend *fe)
 114 {
 115         struct m88rs2000_state *state = fe->demodulator_priv;
 116         u32 mclk;
 117         u8 reg;
 118         /* Must not be 0x00 or 0xff */
 119         reg = m88rs2000_readreg(state, 0x86);
 120         if (!reg || reg == 0xff)
 121                 return 0;
 122
 123         reg /= 2;
 124         reg += 1;
 125
 126         mclk = (u32)(reg * RS2000_FE_CRYSTAL_KHZ + 28 / 2) / 28;
 127
 128         return mclk;
 129 }
 130
 131 static int m88rs2000_set_carrieroffset(struct dvb_frontend *fe, s16 offset)
 132 {
 133         struct m88rs2000_state *state = fe->demodulator_priv;
 134         u32 mclk;
 135         s32 tmp;
 136         u8 reg;
 137         int ret;
 138
 139         mclk = m88rs2000_get_mclk(fe);
 140         if (!mclk)
 141                 return -EINVAL;
 142
 143         tmp = (offset * 4096 + (s32)mclk / 2) / (s32)mclk;
 144         if (tmp < 0)
 145                 tmp += 4096;
 146
 147         /* Carrier Offset */
 148         ret = m88rs2000_writereg(state, 0x9c, (u8)(tmp >> 4));
 149
 150         reg = m88rs2000_readreg(state, 0x9d);
 151         reg &= 0xf;
 152         reg |= (u8)(tmp & 0xf) << 4;
 153
 154         ret |= m88rs2000_writereg(state, 0x9d, reg);
 155
 156         return ret;
 157 }
 158
 159 static int m88rs2000_set_symbolrate(struct dvb_frontend *fe, u32 srate)
 160 {
 161         struct m88rs2000_state *state = fe->demodulator_priv;
 162         int ret;
 163         u64 temp;
 164         u32 mclk;
 165         u8 b[3];
 166
 167         if ((srate < 1000000) || (srate > 45000000))
 168                 return -EINVAL;
 169
 170         mclk = m88rs2000_get_mclk(fe);
 171         if (!mclk)
 172                 return -EINVAL;
 173
 174         temp = srate / 1000;
 175         temp *= 1 << 24;
 176
 177         do_div(temp, mclk);
 178
 179         b[0] = (u8) (temp >> 16) & 0xff;
 180         b[1] = (u8) (temp >> 8) & 0xff;
 181         b[2] = (u8) temp & 0xff;
 182
 183         ret = m88rs2000_writereg(state, 0x93, b[2]);
 184         ret |= m88rs2000_writereg(state, 0x94, b[1]);
 185         ret |= m88rs2000_writereg(state, 0x95, b[0]);
 186
 187         if (srate > 10000000)
 188                 ret |= m88rs2000_writereg(state, 0xa0, 0x20);
 189         else
 190                 ret |= m88rs2000_writereg(state, 0xa0, 0x60);
 191
 192         ret |= m88rs2000_writereg(state, 0xa1, 0xe0);
 193
 194         if (srate > 12000000)
 195                 ret |= m88rs2000_writereg(state, 0xa3, 0x20);
 196         else if (srate > 2800000)
 197                 ret |= m88rs2000_writereg(state, 0xa3, 0x98);
 198         else
 199                 ret |= m88rs2000_writereg(state, 0xa3, 0x90);
 200
 201         deb_info("m88rs2000: m88rs2000_set_symbolrate\n");
 202         return ret;
 203 }
 204
 205 static int m88rs2000_send_diseqc_msg(struct dvb_frontend *fe,
 206                                     struct dvb_diseqc_master_cmd *m)
 207 {
 208         struct m88rs2000_state *state = fe->demodulator_priv;
 209
 210         int i;
 211         u8 reg;
 212         deb_info("%s\n", __func__);
 213         m88rs2000_writereg(state, 0x9a, 0x30);
 214         reg = m88rs2000_readreg(state, 0xb2);
 215         reg &= 0x3f;
 216         m88rs2000_writereg(state, 0xb2, reg);
 217         for (i = 0; i <  m->msg_len; i++)
 218                 m88rs2000_writereg(state, 0xb3 + i, m->msg[i]);
 219
 220         reg = m88rs2000_readreg(state, 0xb1);
 221         reg &= 0x87;
 222         reg |= ((m->msg_len - 1) << 3) | 0x07;
 223         reg &= 0x7f;
 224         m88rs2000_writereg(state, 0xb1, reg);
 225
 226         for (i = 0; i < 15; i++) {
 227                 if ((m88rs2000_readreg(state, 0xb1) & 0x40) == 0x0)
 228                         break;
 229                 msleep(20);
 230         }
 231
 232         reg = m88rs2000_readreg(state, 0xb1);
 233         if ((reg & 0x40) > 0x0) {
 234                 reg &= 0x7f;
 235                 reg |= 0x40;
 236                 m88rs2000_writereg(state, 0xb1, reg);
 237         }
 238
 239         reg = m88rs2000_readreg(state, 0xb2);
 240         reg &= 0x3f;
 241         reg |= 0x80;
 242         m88rs2000_writereg(state, 0xb2, reg);
 243         m88rs2000_writereg(state, 0x9a, 0xb0);
 244
 245
 246         return 0;
 247 }
 248
 249 static int m88rs2000_send_diseqc_burst(struct dvb_frontend *fe,
 250                                                 fe_sec_mini_cmd_t burst)
 251 {
 252         struct m88rs2000_state *state = fe->demodulator_priv;
 253         u8 reg0, reg1;
 254         deb_info("%s\n", __func__);
 255         m88rs2000_writereg(state, 0x9a, 0x30);
 256         msleep(50);
 257         reg0 = m88rs2000_readreg(state, 0xb1);
 258         reg1 = m88rs2000_readreg(state, 0xb2);
 259         /* TODO complete this section */
 260         m88rs2000_writereg(state, 0xb2, reg1);
 261         m88rs2000_writereg(state, 0xb1, reg0);
 262         m88rs2000_writereg(state, 0x9a, 0xb0);
 263
 264         return 0;
 265 }
 266
 267 static int m88rs2000_set_tone(struct dvb_frontend *fe, fe_sec_tone_mode_t tone)
 268 {
 269         struct m88rs2000_state *state = fe->demodulator_priv;
 270         u8 reg0, reg1;
 271         m88rs2000_writereg(state, 0x9a, 0x30);
 272         reg0 = m88rs2000_readreg(state, 0xb1);
 273         reg1 = m88rs2000_readreg(state, 0xb2);
 274
 275         reg1 &= 0x3f;
 276
 277         switch (tone) {
 278         case SEC_TONE_ON:
 279                 reg0 |= 0x4;
 280                 reg0 &= 0xbc;
 281                 break;
 282         case SEC_TONE_OFF:
 283                 reg1 |= 0x80;
 284                 break;
 285         default:
 286                 break;
 287         }
 288         m88rs2000_writereg(state, 0xb2, reg1);
 289         m88rs2000_writereg(state, 0xb1, reg0);
 290         m88rs2000_writereg(state, 0x9a, 0xb0);
 291         return 0;
 292 }
 293
 294 struct inittab {
 295         u8 cmd;
 296         u8 reg;
 297         u8 val;
 298 };
 299
 300 struct inittab m88rs2000_setup[] = {
 301         {DEMOD_WRITE, 0x9a, 0x30},
 302         {DEMOD_WRITE, 0x00, 0x01},
 303         {WRITE_DELAY, 0x19, 0x00},
 304         {DEMOD_WRITE, 0x00, 0x00},
 305         {DEMOD_WRITE, 0x9a, 0xb0},
 306         {DEMOD_WRITE, 0x81, 0xc1},
 307         {DEMOD_WRITE, 0x81, 0x81},
 308         {DEMOD_WRITE, 0x86, 0xc6},
 309         {DEMOD_WRITE, 0x9a, 0x30},
 310         {DEMOD_WRITE, 0xf0, 0x22},
 311         {DEMOD_WRITE, 0xf1, 0xbf},
 312         {DEMOD_WRITE, 0xb0, 0x45},
 313         {DEMOD_WRITE, 0xb2, 0x01}, /* set voltage pin always set 1*/
 314         {DEMOD_WRITE, 0x9a, 0xb0},
 315         {0xff, 0xaa, 0xff}
 316 };
 317
 318 struct inittab m88rs2000_shutdown[] = {
 319         {DEMOD_WRITE, 0x9a, 0x30},
 320         {DEMOD_WRITE, 0xb0, 0x00},
 321         {DEMOD_WRITE, 0xf1, 0x89},
 322         {DEMOD_WRITE, 0x00, 0x01},
 323         {DEMOD_WRITE, 0x9a, 0xb0},
 324         {DEMOD_WRITE, 0x81, 0x81},
 325         {0xff, 0xaa, 0xff}
 326 };
 327
 328 struct inittab fe_reset[] = {
 329         {DEMOD_WRITE, 0x00, 0x01},
 330         {DEMOD_WRITE, 0x20, 0x81},
 331         {DEMOD_WRITE, 0x21, 0x80},
 332         {DEMOD_WRITE, 0x10, 0x33},
 333         {DEMOD_WRITE, 0x11, 0x44},
 334         {DEMOD_WRITE, 0x12, 0x07},
 335         {DEMOD_WRITE, 0x18, 0x20},
 336         {DEMOD_WRITE, 0x28, 0x04},
 337         {DEMOD_WRITE, 0x29, 0x8e},
 338         {DEMOD_WRITE, 0x3b, 0xff},
 339         {DEMOD_WRITE, 0x32, 0x10},
 340         {DEMOD_WRITE, 0x33, 0x02},
 341         {DEMOD_WRITE, 0x34, 0x30},
 342         {DEMOD_WRITE, 0x35, 0xff},
 343         {DEMOD_WRITE, 0x38, 0x50},
 344         {DEMOD_WRITE, 0x39, 0x68},
 345         {DEMOD_WRITE, 0x3c, 0x7f},
 346         {DEMOD_WRITE, 0x3d, 0x0f},
 347         {DEMOD_WRITE, 0x45, 0x20},
 348         {DEMOD_WRITE, 0x46, 0x24},
 349         {DEMOD_WRITE, 0x47, 0x7c},
 350         {DEMOD_WRITE, 0x48, 0x16},
 351         {DEMOD_WRITE, 0x49, 0x04},
 352         {DEMOD_WRITE, 0x4a, 0x01},
 353         {DEMOD_WRITE, 0x4b, 0x78},
 354         {DEMOD_WRITE, 0X4d, 0xd2},
 355         {DEMOD_WRITE, 0x4e, 0x6d},
 356         {DEMOD_WRITE, 0x50, 0x30},
 357         {DEMOD_WRITE, 0x51, 0x30},
 358         {DEMOD_WRITE, 0x54, 0x7b},
 359         {DEMOD_WRITE, 0x56, 0x09},
 360         {DEMOD_WRITE, 0x58, 0x59},
 361         {DEMOD_WRITE, 0x59, 0x37},
 362         {DEMOD_WRITE, 0x63, 0xfa},
 363         {0xff, 0xaa, 0xff}
 364 };
 365
 366 struct inittab fe_trigger[] = {
 367         {DEMOD_WRITE, 0x97, 0x04},
 368         {DEMOD_WRITE, 0x99, 0x77},
 369         {DEMOD_WRITE, 0x9b, 0x64},
 370         {DEMOD_WRITE, 0x9e, 0x00},
 371         {DEMOD_WRITE, 0x9f, 0xf8},
 372         {DEMOD_WRITE, 0x98, 0xff},
 373         {DEMOD_WRITE, 0xc0, 0x0f},
 374         {DEMOD_WRITE, 0x89, 0x01},
 375         {DEMOD_WRITE, 0x00, 0x00},
 376         {WRITE_DELAY, 0x0a, 0x00},
 377         {DEMOD_WRITE, 0x00, 0x01},
 378         {DEMOD_WRITE, 0x00, 0x00},
 379         {DEMOD_WRITE, 0x9a, 0xb0},
 380         {0xff, 0xaa, 0xff}
 381 };
 382
 383 static int m88rs2000_tab_set(struct m88rs2000_state *state,
 384                 struct inittab *tab)
 385 {
 386         int ret = 0;
 387         u8 i;
 388         if (tab == NULL)
 389                 return -EINVAL;
 390
 391         for (i = 0; i < 255; i++) {
 392                 switch (tab[i].cmd) {
 393                 case 0x01:
 394                         ret = m88rs2000_writereg(state, tab[i].reg,
 395                                 tab[i].val);
 396                         break;
 397                 case 0x10:
 398                         if (tab[i].reg > 0)
 399                                 mdelay(tab[i].reg);
 400                         break;
 401                 case 0xff:
 402                         if (tab[i].reg == 0xaa && tab[i].val == 0xff)
 403                                 return 0;
 404                 case 0x00:
 405                         break;
 406                 default:
 407                         return -EINVAL;
 408                 }
 409                 if (ret < 0)
 410                         return -ENODEV;
 411         }
 412         return 0;
 413 }
 414
 415 static int m88rs2000_set_voltage(struct dvb_frontend *fe, fe_sec_voltage_t volt)
 416 {
 417         struct m88rs2000_state *state = fe->demodulator_priv;
 418         u8 data;
 419
 420         data = m88rs2000_readreg(state, 0xb2);
 421         data |= 0x03; /* bit0 V/H, bit1 off/on */
 422
 423         switch (volt) {
 424         case SEC_VOLTAGE_18:
 425                 data &= ~0x03;
 426                 break;
 427         case SEC_VOLTAGE_13:
 428                 data &= ~0x03;
 429                 data |= 0x01;
 430                 break;
 431         case SEC_VOLTAGE_OFF:
 432                 break;
 433         }
 434
 435         m88rs2000_writereg(state, 0xb2, data);
 436
 437         return 0;
 438 }
 439
 440 static int m88rs2000_init(struct dvb_frontend *fe)
 441 {
 442         struct m88rs2000_state *state = fe->demodulator_priv;
 443         int ret;
 444
 445         deb_info("m88rs2000: init chip\n");
 446         /* Setup frontend from shutdown/cold */
 447         if (state->config->inittab)
 448                 ret = m88rs2000_tab_set(state,
 449                                 (struct inittab *)state->config->inittab);
 450         else
 451                 ret = m88rs2000_tab_set(state, m88rs2000_setup);
 452
 453         return ret;
 454 }
 455
 456 static int m88rs2000_sleep(struct dvb_frontend *fe)
 457 {
 458         struct m88rs2000_state *state = fe->demodulator_priv;
 459         int ret;
 460         /* Shutdown the frondend */
 461         ret = m88rs2000_tab_set(state, m88rs2000_shutdown);
 462         return ret;
 463 }
 464
 465 static int m88rs2000_read_status(struct dvb_frontend *fe, fe_status_t *status)
 466 {
 467         struct m88rs2000_state *state = fe->demodulator_priv;
 468         u8 reg = m88rs2000_readreg(state, 0x8c);
 469
 470         *status = 0;
 471
 472         if ((reg & 0xee) == 0xee) {
 473                 *status = FE_HAS_CARRIER | FE_HAS_SIGNAL | FE_HAS_VITERBI
 474                         | FE_HAS_SYNC | FE_HAS_LOCK;
 475                 if (state->config->set_ts_params)
 476                         state->config->set_ts_params(fe, CALL_IS_READ);
 477         }
 478         return 0;
 479 }
 480
 481 static int m88rs2000_read_ber(struct dvb_frontend *fe, u32 *ber)
 482 {
 483         struct m88rs2000_state *state = fe->demodulator_priv;
 484         u8 tmp0, tmp1;
 485
 486         m88rs2000_writereg(state, 0x9a, 0x30);
 487         tmp0 = m88rs2000_readreg(state, 0xd8);
 488         if ((tmp0 & 0x10) != 0) {
 489                 m88rs2000_writereg(state, 0x9a, 0xb0);
 490                 *ber = 0xffffffff;
 491                 return 0;
 492         }
 493
 494         *ber = (m88rs2000_readreg(state, 0xd7) << 8) |
 495                 m88rs2000_readreg(state, 0xd6);
 496
 497         tmp1 = m88rs2000_readreg(state, 0xd9);
 498         m88rs2000_writereg(state, 0xd9, (tmp1 & ~7) | 4);
 499         /* needs twice */
 500         m88rs2000_writereg(state, 0xd8, (tmp0 & ~8) | 0x30);
 501         m88rs2000_writereg(state, 0xd8, (tmp0 & ~8) | 0x30);
 502         m88rs2000_writereg(state, 0x9a, 0xb0);
 503
 504         return 0;
 505 }
 506
 507 static int m88rs2000_read_signal_strength(struct dvb_frontend *fe,
 508         u16 *strength)
 509 {
 510         if (fe->ops.tuner_ops.get_rf_strength)
 511                 fe->ops.tuner_ops.get_rf_strength(fe, strength);
 512
 513         return 0;
 514 }
 515
 516 static int m88rs2000_read_snr(struct dvb_frontend *fe, u16 *snr)
 517 {
 518         struct m88rs2000_state *state = fe->demodulator_priv;
 519
 520         *snr = 512 * m88rs2000_readreg(state, 0x65);
 521
 522         return 0;
 523 }
 524
 525 static int m88rs2000_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 526 {
 527         struct m88rs2000_state *state = fe->demodulator_priv;
 528         u8 tmp;
 529
 530         *ucblocks = (m88rs2000_readreg(state, 0xd5) << 8) |
 531                         m88rs2000_readreg(state, 0xd4);
 532         tmp = m88rs2000_readreg(state, 0xd8);
 533         m88rs2000_writereg(state, 0xd8, tmp & ~0x20);
 534         /* needs two times */
 535         m88rs2000_writereg(state, 0xd8, tmp | 0x20);
 536         m88rs2000_writereg(state, 0xd8, tmp | 0x20);
 537
 538         return 0;
 539 }
 540
 541 static int m88rs2000_set_fec(struct m88rs2000_state *state,
 542                 fe_code_rate_t fec)
 543 {
 544         u8 fec_set, reg;
 545         int ret;
 546
 547         switch (fec) {
 548         case FEC_1_2:
 549                 fec_set = 0x8;
 550                 break;
 551         case FEC_2_3:
 552                 fec_set = 0x10;
 553                 break;
 554         case FEC_3_4:
 555                 fec_set = 0x20;
 556                 break;
 557         case FEC_5_6:
 558                 fec_set = 0x40;
 559                 break;
 560         case FEC_7_8:
 561                 fec_set = 0x80;
 562                 break;
 563         case FEC_AUTO:
 564         default:
 565                 fec_set = 0x0;
 566         }
 567
 568         reg = m88rs2000_readreg(state, 0x70);
 569         reg &= 0x7;
 570         ret = m88rs2000_writereg(state, 0x70, reg | fec_set);
 571
 572         ret |= m88rs2000_writereg(state, 0x76, 0x8);
 573
 574         return ret;
 575 }
 576
 577 static fe_code_rate_t m88rs2000_get_fec(struct m88rs2000_state *state)
 578 {
 579         u8 reg;
 580         m88rs2000_writereg(state, 0x9a, 0x30);
 581         reg = m88rs2000_readreg(state, 0x76);
 582         m88rs2000_writereg(state, 0x9a, 0xb0);
 583
 584         reg &= 0xf0;
 585         reg >>= 5;
 586
 587         switch (reg) {
 588         case 0x4:
 589                 return FEC_1_2;
 590         case 0x3:
 591                 return FEC_2_3;
 592         case 0x2:
 593                 return FEC_3_4;
 594         case 0x1:
 595                 return FEC_5_6;
 596         case 0x0:
 597                 return FEC_7_8;
 598         default:
 599                 break;
 600         }
 601
 602         return FEC_AUTO;
 603 }
 604
 605 static int m88rs2000_set_frontend(struct dvb_frontend *fe)
 606 {
 607         struct m88rs2000_state *state = fe->demodulator_priv;
 608         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 609         fe_status_t status;
 610         int i, ret = 0;
 611         u32 tuner_freq;
 612         s16 offset = 0;
 613         u8 reg;
 614
 615         state->no_lock_count = 0;
 616
 617         if (c->delivery_system != SYS_DVBS) {
 618                         deb_info("%s: unsupported delivery "
 619                                 "system selected (%d)\n",
 620                                 __func__, c->delivery_system);
 621                         return -EOPNOTSUPP;
 622         }
 623
 624         /* Set Tuner */
 625         if (fe->ops.tuner_ops.set_params)
 626                 ret = fe->ops.tuner_ops.set_params(fe);
 627
 628         if (ret < 0)
 629                 return -ENODEV;
 630
 631         if (fe->ops.tuner_ops.get_frequency)
 632                 ret = fe->ops.tuner_ops.get_frequency(fe, &tuner_freq);
 633
 634         if (ret < 0)
 635                 return -ENODEV;
 636
 637         offset = (s16)((s32)tuner_freq - c->frequency);
 638
 639         /* default mclk value 96.4285 * 2 * 1000 = 192857 */
 640         if (((c->frequency % 192857) >= (192857 - 3000)) ||
 641                                 (c->frequency % 192857) <= 3000)
 642                 ret = m88rs2000_writereg(state, 0x86, 0xc2);
 643         else
 644                 ret = m88rs2000_writereg(state, 0x86, 0xc6);
 645
 646         ret |= m88rs2000_set_carrieroffset(fe, offset);
 647         if (ret < 0)
 648                 return -ENODEV;
 649
 650         /* Reset demod by symbol rate */
 651         if (c->symbol_rate > 27500000)
 652                 ret = m88rs2000_writereg(state, 0xf1, 0xa4);
 653         else
 654                 ret = m88rs2000_writereg(state, 0xf1, 0xbf);
 655
 656         ret |= m88rs2000_tab_set(state, fe_reset);
 657         if (ret < 0)
 658                 return -ENODEV;
 659
 660         /* Set FEC */
 661         ret = m88rs2000_set_fec(state, c->fec_inner);
 662         ret |= m88rs2000_writereg(state, 0x85, 0x1);
 663         ret |= m88rs2000_writereg(state, 0x8a, 0xbf);
 664         ret |= m88rs2000_writereg(state, 0x8d, 0x1e);
 665         ret |= m88rs2000_writereg(state, 0x90, 0xf1);
 666         ret |= m88rs2000_writereg(state, 0x91, 0x08);
 667
 668         if (ret < 0)
 669                 return -ENODEV;
 670
 671         /* Set Symbol Rate */
 672         ret = m88rs2000_set_symbolrate(fe, c->symbol_rate);
 673         if (ret < 0)
 674                 return -ENODEV;
 675
 676         /* Set up Demod */
 677         ret = m88rs2000_tab_set(state, fe_trigger);
 678         if (ret < 0)
 679                 return -ENODEV;
 680
 681         for (i = 0; i < 25; i++) {
 682                 reg = m88rs2000_readreg(state, 0x8c);
 683                 if ((reg & 0xee) == 0xee) {
 684                         status = FE_HAS_LOCK;
 685                         break;
 686                 }
 687                 state->no_lock_count++;
 688                 if (state->no_lock_count == 15) {
 689                         reg = m88rs2000_readreg(state, 0x70);
 690                         reg ^= 0x4;
 691                         m88rs2000_writereg(state, 0x70, reg);
 692                         state->no_lock_count = 0;
 693                 }
 694                 msleep(20);
 695         }
 696
 697         if (status & FE_HAS_LOCK) {
 698                 state->fec_inner = m88rs2000_get_fec(state);
 699                 /* Uknown suspect SNR level */
 700                 reg = m88rs2000_readreg(state, 0x65);
 701         }
 702
 703         state->tuner_frequency = c->frequency;
 704         state->symbol_rate = c->symbol_rate;
 705         return 0;
 706 }
 707
 708 static int m88rs2000_get_frontend(struct dvb_frontend *fe)
 709 {
 710         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 711         struct m88rs2000_state *state = fe->demodulator_priv;
 712         c->fec_inner = state->fec_inner;
 713         c->frequency = state->tuner_frequency;
 714         c->symbol_rate = state->symbol_rate;
 715         return 0;
 716 }
 717
 718 static int m88rs2000_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 719 {
 720         struct m88rs2000_state *state = fe->demodulator_priv;
 721
 722         if (enable)
 723                 m88rs2000_writereg(state, 0x81, 0x84);
 724         else
 725                 m88rs2000_writereg(state, 0x81, 0x81);
 726         udelay(10);
 727         return 0;
 728 }
 729
 730 static void m88rs2000_release(struct dvb_frontend *fe)
 731 {
 732         struct m88rs2000_state *state = fe->demodulator_priv;
 733         kfree(state);
 734 }
 735
 736 static struct dvb_frontend_ops m88rs2000_ops = {
 737         .delsys = { SYS_DVBS },
 738         .info = {
 739                 .name                   = "M88RS2000 DVB-S",
 740                 .frequency_min          = 950000,
 741                 .frequency_max          = 2150000,
 742                 .frequency_stepsize     = 1000,  /* kHz for QPSK frontends */
 743                 .frequency_tolerance    = 5000,
 744                 .symbol_rate_min        = 1000000,
 745                 .symbol_rate_max        = 45000000,
 746                 .symbol_rate_tolerance  = 500,  /* ppm */
 747                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 748                       FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 749                       FE_CAN_QPSK |
 750                       FE_CAN_FEC_AUTO
 751         },
 752
 753         .release = m88rs2000_release,
 754         .init = m88rs2000_init,
 755         .sleep = m88rs2000_sleep,
 756         .i2c_gate_ctrl = m88rs2000_i2c_gate_ctrl,
 757         .read_status = m88rs2000_read_status,
 758         .read_ber = m88rs2000_read_ber,
 759         .read_signal_strength = m88rs2000_read_signal_strength,
 760         .read_snr = m88rs2000_read_snr,
 761         .read_ucblocks = m88rs2000_read_ucblocks,
 762         .diseqc_send_master_cmd = m88rs2000_send_diseqc_msg,
 763         .diseqc_send_burst = m88rs2000_send_diseqc_burst,
 764         .set_tone = m88rs2000_set_tone,
 765         .set_voltage = m88rs2000_set_voltage,
 766
 767         .set_frontend = m88rs2000_set_frontend,
 768         .get_frontend = m88rs2000_get_frontend,
 769 };
 770
 771 struct dvb_frontend *m88rs2000_attach(const struct m88rs2000_config *config,
 772                                     struct i2c_adapter *i2c)
 773 {
 774         struct m88rs2000_state *state = NULL;
 775
 776         /* allocate memory for the internal state */
 777         state = kzalloc(sizeof(struct m88rs2000_state), GFP_KERNEL);
 778         if (state == NULL)
 779                 goto error;
 780
 781         /* setup the state */
 782         state->config = config;
 783         state->i2c = i2c;
 784         state->tuner_frequency = 0;
 785         state->symbol_rate = 0;
 786         state->fec_inner = 0;
 787
 788         /* create dvb_frontend */
 789         memcpy(&state->frontend.ops, &m88rs2000_ops,
 790                         sizeof(struct dvb_frontend_ops));
 791         state->frontend.demodulator_priv = state;
 792         return &state->frontend;
 793
 794 error:
 795         kfree(state);
 796
 797         return NULL;
 798 }
 799 EXPORT_SYMBOL(m88rs2000_attach);
 800
 801 MODULE_DESCRIPTION("M88RS2000 DVB-S Demodulator driver");
 802 MODULE_AUTHOR("Malcolm Priestley tvboxspy@gmail.com");
 803 MODULE_LICENSE("GPL");
 804 MODULE_VERSION("1.13");
 805