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         enum fe_code_rate 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, ret == %i)\n",
  79                          __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                                        enum fe_sec_mini_cmd 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,
 268                               enum fe_sec_tone_mode tone)
 269 {
 270         struct m88rs2000_state *state = fe->demodulator_priv;
 271         u8 reg0, reg1;
 272         m88rs2000_writereg(state, 0x9a, 0x30);
 273         reg0 = m88rs2000_readreg(state, 0xb1);
 274         reg1 = m88rs2000_readreg(state, 0xb2);
 275
 276         reg1 &= 0x3f;
 277
 278         switch (tone) {
 279         case SEC_TONE_ON:
 280                 reg0 |= 0x4;
 281                 reg0 &= 0xbc;
 282                 break;
 283         case SEC_TONE_OFF:
 284                 reg1 |= 0x80;
 285                 break;
 286         default:
 287                 break;
 288         }
 289         m88rs2000_writereg(state, 0xb2, reg1);
 290         m88rs2000_writereg(state, 0xb1, reg0);
 291         m88rs2000_writereg(state, 0x9a, 0xb0);
 292         return 0;
 293 }
 294
 295 struct inittab {
 296         u8 cmd;
 297         u8 reg;
 298         u8 val;
 299 };
 300
 301 static struct inittab m88rs2000_setup[] = {
 302         {DEMOD_WRITE, 0x9a, 0x30},
 303         {DEMOD_WRITE, 0x00, 0x01},
 304         {WRITE_DELAY, 0x19, 0x00},
 305         {DEMOD_WRITE, 0x00, 0x00},
 306         {DEMOD_WRITE, 0x9a, 0xb0},
 307         {DEMOD_WRITE, 0x81, 0xc1},
 308         {DEMOD_WRITE, 0x81, 0x81},
 309         {DEMOD_WRITE, 0x86, 0xc6},
 310         {DEMOD_WRITE, 0x9a, 0x30},
 311         {DEMOD_WRITE, 0xf0, 0x22},
 312         {DEMOD_WRITE, 0xf1, 0xbf},
 313         {DEMOD_WRITE, 0xb0, 0x45},
 314         {DEMOD_WRITE, 0xb2, 0x01}, /* set voltage pin always set 1*/
 315         {DEMOD_WRITE, 0x9a, 0xb0},
 316         {0xff, 0xaa, 0xff}
 317 };
 318
 319 static struct inittab m88rs2000_shutdown[] = {
 320         {DEMOD_WRITE, 0x9a, 0x30},
 321         {DEMOD_WRITE, 0xb0, 0x00},
 322         {DEMOD_WRITE, 0xf1, 0x89},
 323         {DEMOD_WRITE, 0x00, 0x01},
 324         {DEMOD_WRITE, 0x9a, 0xb0},
 325         {DEMOD_WRITE, 0x81, 0x81},
 326         {0xff, 0xaa, 0xff}
 327 };
 328
 329 static struct inittab fe_reset[] = {
 330         {DEMOD_WRITE, 0x00, 0x01},
 331         {DEMOD_WRITE, 0x20, 0x81},
 332         {DEMOD_WRITE, 0x21, 0x80},
 333         {DEMOD_WRITE, 0x10, 0x33},
 334         {DEMOD_WRITE, 0x11, 0x44},
 335         {DEMOD_WRITE, 0x12, 0x07},
 336         {DEMOD_WRITE, 0x18, 0x20},
 337         {DEMOD_WRITE, 0x28, 0x04},
 338         {DEMOD_WRITE, 0x29, 0x8e},
 339         {DEMOD_WRITE, 0x3b, 0xff},
 340         {DEMOD_WRITE, 0x32, 0x10},
 341         {DEMOD_WRITE, 0x33, 0x02},
 342         {DEMOD_WRITE, 0x34, 0x30},
 343         {DEMOD_WRITE, 0x35, 0xff},
 344         {DEMOD_WRITE, 0x38, 0x50},
 345         {DEMOD_WRITE, 0x39, 0x68},
 346         {DEMOD_WRITE, 0x3c, 0x7f},
 347         {DEMOD_WRITE, 0x3d, 0x0f},
 348         {DEMOD_WRITE, 0x45, 0x20},
 349         {DEMOD_WRITE, 0x46, 0x24},
 350         {DEMOD_WRITE, 0x47, 0x7c},
 351         {DEMOD_WRITE, 0x48, 0x16},
 352         {DEMOD_WRITE, 0x49, 0x04},
 353         {DEMOD_WRITE, 0x4a, 0x01},
 354         {DEMOD_WRITE, 0x4b, 0x78},
 355         {DEMOD_WRITE, 0X4d, 0xd2},
 356         {DEMOD_WRITE, 0x4e, 0x6d},
 357         {DEMOD_WRITE, 0x50, 0x30},
 358         {DEMOD_WRITE, 0x51, 0x30},
 359         {DEMOD_WRITE, 0x54, 0x7b},
 360         {DEMOD_WRITE, 0x56, 0x09},
 361         {DEMOD_WRITE, 0x58, 0x59},
 362         {DEMOD_WRITE, 0x59, 0x37},
 363         {DEMOD_WRITE, 0x63, 0xfa},
 364         {0xff, 0xaa, 0xff}
 365 };
 366
 367 static struct inittab fe_trigger[] = {
 368         {DEMOD_WRITE, 0x97, 0x04},
 369         {DEMOD_WRITE, 0x99, 0x77},
 370         {DEMOD_WRITE, 0x9b, 0x64},
 371         {DEMOD_WRITE, 0x9e, 0x00},
 372         {DEMOD_WRITE, 0x9f, 0xf8},
 373         {DEMOD_WRITE, 0x98, 0xff},
 374         {DEMOD_WRITE, 0xc0, 0x0f},
 375         {DEMOD_WRITE, 0x89, 0x01},
 376         {DEMOD_WRITE, 0x00, 0x00},
 377         {WRITE_DELAY, 0x0a, 0x00},
 378         {DEMOD_WRITE, 0x00, 0x01},
 379         {DEMOD_WRITE, 0x00, 0x00},
 380         {DEMOD_WRITE, 0x9a, 0xb0},
 381         {0xff, 0xaa, 0xff}
 382 };
 383
 384 static int m88rs2000_tab_set(struct m88rs2000_state *state,
 385                 struct inittab *tab)
 386 {
 387         int ret = 0;
 388         u8 i;
 389         if (tab == NULL)
 390                 return -EINVAL;
 391
 392         for (i = 0; i < 255; i++) {
 393                 switch (tab[i].cmd) {
 394                 case 0x01:
 395                         ret = m88rs2000_writereg(state, tab[i].reg,
 396                                 tab[i].val);
 397                         break;
 398                 case 0x10:
 399                         if (tab[i].reg > 0)
 400                                 mdelay(tab[i].reg);
 401                         break;
 402                 case 0xff:
 403                         if (tab[i].reg == 0xaa && tab[i].val == 0xff)
 404                                 return 0;
 405                 case 0x00:
 406                         break;
 407                 default:
 408                         return -EINVAL;
 409                 }
 410                 if (ret < 0)
 411                         return -ENODEV;
 412         }
 413         return 0;
 414 }
 415
 416 static int m88rs2000_set_voltage(struct dvb_frontend *fe,
 417                                  enum fe_sec_voltage volt)
 418 {
 419         struct m88rs2000_state *state = fe->demodulator_priv;
 420         u8 data;
 421
 422         data = m88rs2000_readreg(state, 0xb2);
 423         data |= 0x03; /* bit0 V/H, bit1 off/on */
 424
 425         switch (volt) {
 426         case SEC_VOLTAGE_18:
 427                 data &= ~0x03;
 428                 break;
 429         case SEC_VOLTAGE_13:
 430                 data &= ~0x03;
 431                 data |= 0x01;
 432                 break;
 433         case SEC_VOLTAGE_OFF:
 434                 break;
 435         }
 436
 437         m88rs2000_writereg(state, 0xb2, data);
 438
 439         return 0;
 440 }
 441
 442 static int m88rs2000_init(struct dvb_frontend *fe)
 443 {
 444         struct m88rs2000_state *state = fe->demodulator_priv;
 445         int ret;
 446
 447         deb_info("m88rs2000: init chip\n");
 448         /* Setup frontend from shutdown/cold */
 449         if (state->config->inittab)
 450                 ret = m88rs2000_tab_set(state,
 451                                 (struct inittab *)state->config->inittab);
 452         else
 453                 ret = m88rs2000_tab_set(state, m88rs2000_setup);
 454
 455         return ret;
 456 }
 457
 458 static int m88rs2000_sleep(struct dvb_frontend *fe)
 459 {
 460         struct m88rs2000_state *state = fe->demodulator_priv;
 461         int ret;
 462         /* Shutdown the frondend */
 463         ret = m88rs2000_tab_set(state, m88rs2000_shutdown);
 464         return ret;
 465 }
 466
 467 static int m88rs2000_read_status(struct dvb_frontend *fe,
 468                                  enum fe_status *status)
 469 {
 470         struct m88rs2000_state *state = fe->demodulator_priv;
 471         u8 reg = m88rs2000_readreg(state, 0x8c);
 472
 473         *status = 0;
 474
 475         if ((reg & 0xee) == 0xee) {
 476                 *status = FE_HAS_CARRIER | FE_HAS_SIGNAL | FE_HAS_VITERBI
 477                         | FE_HAS_SYNC | FE_HAS_LOCK;
 478                 if (state->config->set_ts_params)
 479                         state->config->set_ts_params(fe, CALL_IS_READ);
 480         }
 481         return 0;
 482 }
 483
 484 static int m88rs2000_read_ber(struct dvb_frontend *fe, u32 *ber)
 485 {
 486         struct m88rs2000_state *state = fe->demodulator_priv;
 487         u8 tmp0, tmp1;
 488
 489         m88rs2000_writereg(state, 0x9a, 0x30);
 490         tmp0 = m88rs2000_readreg(state, 0xd8);
 491         if ((tmp0 & 0x10) != 0) {
 492                 m88rs2000_writereg(state, 0x9a, 0xb0);
 493                 *ber = 0xffffffff;
 494                 return 0;
 495         }
 496
 497         *ber = (m88rs2000_readreg(state, 0xd7) << 8) |
 498                 m88rs2000_readreg(state, 0xd6);
 499
 500         tmp1 = m88rs2000_readreg(state, 0xd9);
 501         m88rs2000_writereg(state, 0xd9, (tmp1 & ~7) | 4);
 502         /* needs twice */
 503         m88rs2000_writereg(state, 0xd8, (tmp0 & ~8) | 0x30);
 504         m88rs2000_writereg(state, 0xd8, (tmp0 & ~8) | 0x30);
 505         m88rs2000_writereg(state, 0x9a, 0xb0);
 506
 507         return 0;
 508 }
 509
 510 static int m88rs2000_read_signal_strength(struct dvb_frontend *fe,
 511         u16 *strength)
 512 {
 513         if (fe->ops.tuner_ops.get_rf_strength)
 514                 fe->ops.tuner_ops.get_rf_strength(fe, strength);
 515
 516         return 0;
 517 }
 518
 519 static int m88rs2000_read_snr(struct dvb_frontend *fe, u16 *snr)
 520 {
 521         struct m88rs2000_state *state = fe->demodulator_priv;
 522
 523         *snr = 512 * m88rs2000_readreg(state, 0x65);
 524
 525         return 0;
 526 }
 527
 528 static int m88rs2000_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 529 {
 530         struct m88rs2000_state *state = fe->demodulator_priv;
 531         u8 tmp;
 532
 533         *ucblocks = (m88rs2000_readreg(state, 0xd5) << 8) |
 534                         m88rs2000_readreg(state, 0xd4);
 535         tmp = m88rs2000_readreg(state, 0xd8);
 536         m88rs2000_writereg(state, 0xd8, tmp & ~0x20);
 537         /* needs two times */
 538         m88rs2000_writereg(state, 0xd8, tmp | 0x20);
 539         m88rs2000_writereg(state, 0xd8, tmp | 0x20);
 540
 541         return 0;
 542 }
 543
 544 static int m88rs2000_set_fec(struct m88rs2000_state *state,
 545                              enum fe_code_rate fec)
 546 {
 547         u8 fec_set, reg;
 548         int ret;
 549
 550         switch (fec) {
 551         case FEC_1_2:
 552                 fec_set = 0x8;
 553                 break;
 554         case FEC_2_3:
 555                 fec_set = 0x10;
 556                 break;
 557         case FEC_3_4:
 558                 fec_set = 0x20;
 559                 break;
 560         case FEC_5_6:
 561                 fec_set = 0x40;
 562                 break;
 563         case FEC_7_8:
 564                 fec_set = 0x80;
 565                 break;
 566         case FEC_AUTO:
 567         default:
 568                 fec_set = 0x0;
 569         }
 570
 571         reg = m88rs2000_readreg(state, 0x70);
 572         reg &= 0x7;
 573         ret = m88rs2000_writereg(state, 0x70, reg | fec_set);
 574
 575         ret |= m88rs2000_writereg(state, 0x76, 0x8);
 576
 577         return ret;
 578 }
 579
 580 static enum fe_code_rate m88rs2000_get_fec(struct m88rs2000_state *state)
 581 {
 582         u8 reg;
 583         m88rs2000_writereg(state, 0x9a, 0x30);
 584         reg = m88rs2000_readreg(state, 0x76);
 585         m88rs2000_writereg(state, 0x9a, 0xb0);
 586
 587         reg &= 0xf0;
 588         reg >>= 5;
 589
 590         switch (reg) {
 591         case 0x4:
 592                 return FEC_1_2;
 593         case 0x3:
 594                 return FEC_2_3;
 595         case 0x2:
 596                 return FEC_3_4;
 597         case 0x1:
 598                 return FEC_5_6;
 599         case 0x0:
 600                 return FEC_7_8;
 601         default:
 602                 break;
 603         }
 604
 605         return FEC_AUTO;
 606 }
 607
 608 static int m88rs2000_set_frontend(struct dvb_frontend *fe)
 609 {
 610         struct m88rs2000_state *state = fe->demodulator_priv;
 611         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 612         enum fe_status status = 0;
 613         int i, ret = 0;
 614         u32 tuner_freq;
 615         s16 offset = 0;
 616         u8 reg;
 617
 618         state->no_lock_count = 0;
 619
 620         if (c->delivery_system != SYS_DVBS) {
 621                 deb_info("%s: unsupported delivery system selected (%d)\n",
 622                          __func__, c->delivery_system);
 623                 return -EOPNOTSUPP;
 624         }
 625
 626         /* Set Tuner */
 627         if (fe->ops.tuner_ops.set_params)
 628                 ret = fe->ops.tuner_ops.set_params(fe);
 629
 630         if (ret < 0)
 631                 return -ENODEV;
 632
 633         if (fe->ops.tuner_ops.get_frequency)
 634                 ret = fe->ops.tuner_ops.get_frequency(fe, &tuner_freq);
 635
 636         if (ret < 0)
 637                 return -ENODEV;
 638
 639         offset = (s16)((s32)tuner_freq - c->frequency);
 640
 641         /* default mclk value 96.4285 * 2 * 1000 = 192857 */
 642         if (((c->frequency % 192857) >= (192857 - 3000)) ||
 643                                 (c->frequency % 192857) <= 3000)
 644                 ret = m88rs2000_writereg(state, 0x86, 0xc2);
 645         else
 646                 ret = m88rs2000_writereg(state, 0x86, 0xc6);
 647
 648         ret |= m88rs2000_set_carrieroffset(fe, offset);
 649         if (ret < 0)
 650                 return -ENODEV;
 651
 652         /* Reset demod by symbol rate */
 653         if (c->symbol_rate > 27500000)
 654                 ret = m88rs2000_writereg(state, 0xf1, 0xa4);
 655         else
 656                 ret = m88rs2000_writereg(state, 0xf1, 0xbf);
 657
 658         ret |= m88rs2000_tab_set(state, fe_reset);
 659         if (ret < 0)
 660                 return -ENODEV;
 661
 662         /* Set FEC */
 663         ret = m88rs2000_set_fec(state, c->fec_inner);
 664         ret |= m88rs2000_writereg(state, 0x85, 0x1);
 665         ret |= m88rs2000_writereg(state, 0x8a, 0xbf);
 666         ret |= m88rs2000_writereg(state, 0x8d, 0x1e);
 667         ret |= m88rs2000_writereg(state, 0x90, 0xf1);
 668         ret |= m88rs2000_writereg(state, 0x91, 0x08);
 669
 670         if (ret < 0)
 671                 return -ENODEV;
 672
 673         /* Set Symbol Rate */
 674         ret = m88rs2000_set_symbolrate(fe, c->symbol_rate);
 675         if (ret < 0)
 676                 return -ENODEV;
 677
 678         /* Set up Demod */
 679         ret = m88rs2000_tab_set(state, fe_trigger);
 680         if (ret < 0)
 681                 return -ENODEV;
 682
 683         for (i = 0; i < 25; i++) {
 684                 reg = m88rs2000_readreg(state, 0x8c);
 685                 if ((reg & 0xee) == 0xee) {
 686                         status = FE_HAS_LOCK;
 687                         break;
 688                 }
 689                 state->no_lock_count++;
 690                 if (state->no_lock_count == 15) {
 691                         reg = m88rs2000_readreg(state, 0x70);
 692                         reg ^= 0x4;
 693                         m88rs2000_writereg(state, 0x70, reg);
 694                         state->no_lock_count = 0;
 695                 }
 696                 msleep(20);
 697         }
 698
 699         if (status & FE_HAS_LOCK) {
 700                 state->fec_inner = m88rs2000_get_fec(state);
 701                 /* Uknown suspect SNR level */
 702                 reg = m88rs2000_readreg(state, 0x65);
 703         }
 704
 705         state->tuner_frequency = c->frequency;
 706         state->symbol_rate = c->symbol_rate;
 707         return 0;
 708 }
 709
 710 static int m88rs2000_get_frontend(struct dvb_frontend *fe,
 711                                   struct dtv_frontend_properties *c)
 712 {
 713         struct m88rs2000_state *state = fe->demodulator_priv;
 714
 715         c->fec_inner = state->fec_inner;
 716         c->frequency = state->tuner_frequency;
 717         c->symbol_rate = state->symbol_rate;
 718         return 0;
 719 }
 720
 721 static int m88rs2000_get_tune_settings(struct dvb_frontend *fe,
 722         struct dvb_frontend_tune_settings *tune)
 723 {
 724         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 725
 726         if (c->symbol_rate > 3000000)
 727                 tune->min_delay_ms = 2000;
 728         else
 729                 tune->min_delay_ms = 3000;
 730
 731         tune->step_size = c->symbol_rate / 16000;
 732         tune->max_drift = c->symbol_rate / 2000;
 733
 734         return 0;
 735 }
 736
 737 static int m88rs2000_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 738 {
 739         struct m88rs2000_state *state = fe->demodulator_priv;
 740
 741         if (enable)
 742                 m88rs2000_writereg(state, 0x81, 0x84);
 743         else
 744                 m88rs2000_writereg(state, 0x81, 0x81);
 745         udelay(10);
 746         return 0;
 747 }
 748
 749 static void m88rs2000_release(struct dvb_frontend *fe)
 750 {
 751         struct m88rs2000_state *state = fe->demodulator_priv;
 752         kfree(state);
 753 }
 754
 755 static const struct dvb_frontend_ops m88rs2000_ops = {
 756         .delsys = { SYS_DVBS },
 757         .info = {
 758                 .name                   = "M88RS2000 DVB-S",
 759                 .frequency_min          = 950000,
 760                 .frequency_max          = 2150000,
 761                 .frequency_stepsize     = 1000,  /* kHz for QPSK frontends */
 762                 .frequency_tolerance    = 5000,
 763                 .symbol_rate_min        = 1000000,
 764                 .symbol_rate_max        = 45000000,
 765                 .symbol_rate_tolerance  = 500,  /* ppm */
 766                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 767                       FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 768                       FE_CAN_QPSK | FE_CAN_INVERSION_AUTO |
 769                       FE_CAN_FEC_AUTO
 770         },
 771
 772         .release = m88rs2000_release,
 773         .init = m88rs2000_init,
 774         .sleep = m88rs2000_sleep,
 775         .i2c_gate_ctrl = m88rs2000_i2c_gate_ctrl,
 776         .read_status = m88rs2000_read_status,
 777         .read_ber = m88rs2000_read_ber,
 778         .read_signal_strength = m88rs2000_read_signal_strength,
 779         .read_snr = m88rs2000_read_snr,
 780         .read_ucblocks = m88rs2000_read_ucblocks,
 781         .diseqc_send_master_cmd = m88rs2000_send_diseqc_msg,
 782         .diseqc_send_burst = m88rs2000_send_diseqc_burst,
 783         .set_tone = m88rs2000_set_tone,
 784         .set_voltage = m88rs2000_set_voltage,
 785
 786         .set_frontend = m88rs2000_set_frontend,
 787         .get_frontend = m88rs2000_get_frontend,
 788         .get_tune_settings = m88rs2000_get_tune_settings,
 789 };
 790
 791 struct dvb_frontend *m88rs2000_attach(const struct m88rs2000_config *config,
 792                                     struct i2c_adapter *i2c)
 793 {
 794         struct m88rs2000_state *state = NULL;
 795
 796         /* allocate memory for the internal state */
 797         state = kzalloc(sizeof(struct m88rs2000_state), GFP_KERNEL);
 798         if (state == NULL)
 799                 goto error;
 800
 801         /* setup the state */
 802         state->config = config;
 803         state->i2c = i2c;
 804         state->tuner_frequency = 0;
 805         state->symbol_rate = 0;
 806         state->fec_inner = 0;
 807
 808         /* create dvb_frontend */
 809         memcpy(&state->frontend.ops, &m88rs2000_ops,
 810                         sizeof(struct dvb_frontend_ops));
 811         state->frontend.demodulator_priv = state;
 812         return &state->frontend;
 813
 814 error:
 815         kfree(state);
 816
 817         return NULL;
 818 }
 819 EXPORT_SYMBOL(m88rs2000_attach);
 820
 821 MODULE_DESCRIPTION("M88RS2000 DVB-S Demodulator driver");
 822 MODULE_AUTHOR("Malcolm Priestley tvboxspy@gmail.com");
 823 MODULE_LICENSE("GPL");
 824 MODULE_VERSION("1.13");
 825