drivers/media/dvb-frontends/m88rs2000.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3         Driver for M88RS2000 demodulator and tuner
   4
   5         Copyright (C) 2012 Malcolm Priestley (tvboxspy@gmail.com)
   6         Beta Driver
   7
   8         Include various calculation code from DS3000 driver.
   9         Copyright (C) 2009 Konstantin Dimitrov.
  10
  11
  12 */
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/jiffies.h>
  17 #include <linux/string.h>
  18 #include <linux/slab.h>
  19 #include <linux/types.h>
  20
  21
  22 #include <media/dvb_frontend.h>
  23 #include "m88rs2000.h"
  24
  25 struct m88rs2000_state {
  26         struct i2c_adapter *i2c;
  27         const struct m88rs2000_config *config;
  28         struct dvb_frontend frontend;
  29         u8 no_lock_count;
  30         u32 tuner_frequency;
  31         u32 symbol_rate;
  32         enum fe_code_rate fec_inner;
  33         u8 tuner_level;
  34         int errmode;
  35 };
  36
  37 static int m88rs2000_debug;
  38
  39 module_param_named(debug, m88rs2000_debug, int, 0644);
  40 MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
  41
  42 #define dprintk(level, args...) do { \
  43         if (level & m88rs2000_debug) \
  44                 printk(KERN_DEBUG "m88rs2000-fe: " args); \
  45 } while (0)
  46
  47 #define deb_info(args...)  dprintk(0x01, args)
  48 #define info(format, arg...) \
  49         printk(KERN_INFO "m88rs2000-fe: " format "\n" , ## arg)
  50
  51 static int m88rs2000_writereg(struct m88rs2000_state *state,
  52         u8 reg, u8 data)
  53 {
  54         int ret;
  55         u8 buf[] = { reg, data };
  56         struct i2c_msg msg = {
  57                 .addr = state->config->demod_addr,
  58                 .flags = 0,
  59                 .buf = buf,
  60                 .len = 2
  61         };
  62
  63         ret = i2c_transfer(state->i2c, &msg, 1);
  64
  65         if (ret != 1)
  66                 deb_info("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  67                          __func__, reg, data, ret);
  68
  69         return (ret != 1) ? -EREMOTEIO : 0;
  70 }
  71
  72 static u8 m88rs2000_readreg(struct m88rs2000_state *state, u8 reg)
  73 {
  74         int ret;
  75         u8 b0[] = { reg };
  76         u8 b1[] = { 0 };
  77
  78         struct i2c_msg msg[] = {
  79                 {
  80                         .addr = state->config->demod_addr,
  81                         .flags = 0,
  82                         .buf = b0,
  83                         .len = 1
  84                 }, {
  85                         .addr = state->config->demod_addr,
  86                         .flags = I2C_M_RD,
  87                         .buf = b1,
  88                         .len = 1
  89                 }
  90         };
  91
  92         ret = i2c_transfer(state->i2c, msg, 2);
  93
  94         if (ret != 2)
  95                 deb_info("%s: readreg error (reg == 0x%02x, ret == %i)\n",
  96                                 __func__, reg, ret);
  97
  98         return b1[0];
  99 }
 100
 101 static u32 m88rs2000_get_mclk(struct dvb_frontend *fe)
 102 {
 103         struct m88rs2000_state *state = fe->demodulator_priv;
 104         u32 mclk;
 105         u8 reg;
 106         /* Must not be 0x00 or 0xff */
 107         reg = m88rs2000_readreg(state, 0x86);
 108         if (!reg || reg == 0xff)
 109                 return 0;
 110
 111         reg /= 2;
 112         reg += 1;
 113
 114         mclk = (u32)(reg * RS2000_FE_CRYSTAL_KHZ + 28 / 2) / 28;
 115
 116         return mclk;
 117 }
 118
 119 static int m88rs2000_set_carrieroffset(struct dvb_frontend *fe, s16 offset)
 120 {
 121         struct m88rs2000_state *state = fe->demodulator_priv;
 122         u32 mclk;
 123         s32 tmp;
 124         u8 reg;
 125         int ret;
 126
 127         mclk = m88rs2000_get_mclk(fe);
 128         if (!mclk)
 129                 return -EINVAL;
 130
 131         tmp = (offset * 4096 + (s32)mclk / 2) / (s32)mclk;
 132         if (tmp < 0)
 133                 tmp += 4096;
 134
 135         /* Carrier Offset */
 136         ret = m88rs2000_writereg(state, 0x9c, (u8)(tmp >> 4));
 137
 138         reg = m88rs2000_readreg(state, 0x9d);
 139         reg &= 0xf;
 140         reg |= (u8)(tmp & 0xf) << 4;
 141
 142         ret |= m88rs2000_writereg(state, 0x9d, reg);
 143
 144         return ret;
 145 }
 146
 147 static int m88rs2000_set_symbolrate(struct dvb_frontend *fe, u32 srate)
 148 {
 149         struct m88rs2000_state *state = fe->demodulator_priv;
 150         int ret;
 151         u64 temp;
 152         u32 mclk;
 153         u8 b[3];
 154
 155         if ((srate < 1000000) || (srate > 45000000))
 156                 return -EINVAL;
 157
 158         mclk = m88rs2000_get_mclk(fe);
 159         if (!mclk)
 160                 return -EINVAL;
 161
 162         temp = srate / 1000;
 163         temp *= 1 << 24;
 164
 165         do_div(temp, mclk);
 166
 167         b[0] = (u8) (temp >> 16) & 0xff;
 168         b[1] = (u8) (temp >> 8) & 0xff;
 169         b[2] = (u8) temp & 0xff;
 170
 171         ret = m88rs2000_writereg(state, 0x93, b[2]);
 172         ret |= m88rs2000_writereg(state, 0x94, b[1]);
 173         ret |= m88rs2000_writereg(state, 0x95, b[0]);
 174
 175         if (srate > 10000000)
 176                 ret |= m88rs2000_writereg(state, 0xa0, 0x20);
 177         else
 178                 ret |= m88rs2000_writereg(state, 0xa0, 0x60);
 179
 180         ret |= m88rs2000_writereg(state, 0xa1, 0xe0);
 181
 182         if (srate > 12000000)
 183                 ret |= m88rs2000_writereg(state, 0xa3, 0x20);
 184         else if (srate > 2800000)
 185                 ret |= m88rs2000_writereg(state, 0xa3, 0x98);
 186         else
 187                 ret |= m88rs2000_writereg(state, 0xa3, 0x90);
 188
 189         deb_info("m88rs2000: m88rs2000_set_symbolrate\n");
 190         return ret;
 191 }
 192
 193 static int m88rs2000_send_diseqc_msg(struct dvb_frontend *fe,
 194                                     struct dvb_diseqc_master_cmd *m)
 195 {
 196         struct m88rs2000_state *state = fe->demodulator_priv;
 197
 198         int i;
 199         u8 reg;
 200         deb_info("%s\n", __func__);
 201         m88rs2000_writereg(state, 0x9a, 0x30);
 202         reg = m88rs2000_readreg(state, 0xb2);
 203         reg &= 0x3f;
 204         m88rs2000_writereg(state, 0xb2, reg);
 205         for (i = 0; i <  m->msg_len; i++)
 206                 m88rs2000_writereg(state, 0xb3 + i, m->msg[i]);
 207
 208         reg = m88rs2000_readreg(state, 0xb1);
 209         reg &= 0x87;
 210         reg |= ((m->msg_len - 1) << 3) | 0x07;
 211         reg &= 0x7f;
 212         m88rs2000_writereg(state, 0xb1, reg);
 213
 214         for (i = 0; i < 15; i++) {
 215                 if ((m88rs2000_readreg(state, 0xb1) & 0x40) == 0x0)
 216                         break;
 217                 msleep(20);
 218         }
 219
 220         reg = m88rs2000_readreg(state, 0xb1);
 221         if ((reg & 0x40) > 0x0) {
 222                 reg &= 0x7f;
 223                 reg |= 0x40;
 224                 m88rs2000_writereg(state, 0xb1, reg);
 225         }
 226
 227         reg = m88rs2000_readreg(state, 0xb2);
 228         reg &= 0x3f;
 229         reg |= 0x80;
 230         m88rs2000_writereg(state, 0xb2, reg);
 231         m88rs2000_writereg(state, 0x9a, 0xb0);
 232
 233
 234         return 0;
 235 }
 236
 237 static int m88rs2000_send_diseqc_burst(struct dvb_frontend *fe,
 238                                        enum fe_sec_mini_cmd burst)
 239 {
 240         struct m88rs2000_state *state = fe->demodulator_priv;
 241         u8 reg0, reg1;
 242         deb_info("%s\n", __func__);
 243         m88rs2000_writereg(state, 0x9a, 0x30);
 244         msleep(50);
 245         reg0 = m88rs2000_readreg(state, 0xb1);
 246         reg1 = m88rs2000_readreg(state, 0xb2);
 247         /* TODO complete this section */
 248         m88rs2000_writereg(state, 0xb2, reg1);
 249         m88rs2000_writereg(state, 0xb1, reg0);
 250         m88rs2000_writereg(state, 0x9a, 0xb0);
 251
 252         return 0;
 253 }
 254
 255 static int m88rs2000_set_tone(struct dvb_frontend *fe,
 256                               enum fe_sec_tone_mode tone)
 257 {
 258         struct m88rs2000_state *state = fe->demodulator_priv;
 259         u8 reg0, reg1;
 260         m88rs2000_writereg(state, 0x9a, 0x30);
 261         reg0 = m88rs2000_readreg(state, 0xb1);
 262         reg1 = m88rs2000_readreg(state, 0xb2);
 263
 264         reg1 &= 0x3f;
 265
 266         switch (tone) {
 267         case SEC_TONE_ON:
 268                 reg0 |= 0x4;
 269                 reg0 &= 0xbc;
 270                 break;
 271         case SEC_TONE_OFF:
 272                 reg1 |= 0x80;
 273                 break;
 274         default:
 275                 break;
 276         }
 277         m88rs2000_writereg(state, 0xb2, reg1);
 278         m88rs2000_writereg(state, 0xb1, reg0);
 279         m88rs2000_writereg(state, 0x9a, 0xb0);
 280         return 0;
 281 }
 282
 283 struct inittab {
 284         u8 cmd;
 285         u8 reg;
 286         u8 val;
 287 };
 288
 289 static struct inittab m88rs2000_setup[] = {
 290         {DEMOD_WRITE, 0x9a, 0x30},
 291         {DEMOD_WRITE, 0x00, 0x01},
 292         {WRITE_DELAY, 0x19, 0x00},
 293         {DEMOD_WRITE, 0x00, 0x00},
 294         {DEMOD_WRITE, 0x9a, 0xb0},
 295         {DEMOD_WRITE, 0x81, 0xc1},
 296         {DEMOD_WRITE, 0x81, 0x81},
 297         {DEMOD_WRITE, 0x86, 0xc6},
 298         {DEMOD_WRITE, 0x9a, 0x30},
 299         {DEMOD_WRITE, 0xf0, 0x22},
 300         {DEMOD_WRITE, 0xf1, 0xbf},
 301         {DEMOD_WRITE, 0xb0, 0x45},
 302         {DEMOD_WRITE, 0xb2, 0x01}, /* set voltage pin always set 1*/
 303         {DEMOD_WRITE, 0x9a, 0xb0},
 304         {0xff, 0xaa, 0xff}
 305 };
 306
 307 static struct inittab m88rs2000_shutdown[] = {
 308         {DEMOD_WRITE, 0x9a, 0x30},
 309         {DEMOD_WRITE, 0xb0, 0x00},
 310         {DEMOD_WRITE, 0xf1, 0x89},
 311         {DEMOD_WRITE, 0x00, 0x01},
 312         {DEMOD_WRITE, 0x9a, 0xb0},
 313         {DEMOD_WRITE, 0x81, 0x81},
 314         {0xff, 0xaa, 0xff}
 315 };
 316
 317 static struct inittab fe_reset[] = {
 318         {DEMOD_WRITE, 0x00, 0x01},
 319         {DEMOD_WRITE, 0x20, 0x81},
 320         {DEMOD_WRITE, 0x21, 0x80},
 321         {DEMOD_WRITE, 0x10, 0x33},
 322         {DEMOD_WRITE, 0x11, 0x44},
 323         {DEMOD_WRITE, 0x12, 0x07},
 324         {DEMOD_WRITE, 0x18, 0x20},
 325         {DEMOD_WRITE, 0x28, 0x04},
 326         {DEMOD_WRITE, 0x29, 0x8e},
 327         {DEMOD_WRITE, 0x3b, 0xff},
 328         {DEMOD_WRITE, 0x32, 0x10},
 329         {DEMOD_WRITE, 0x33, 0x02},
 330         {DEMOD_WRITE, 0x34, 0x30},
 331         {DEMOD_WRITE, 0x35, 0xff},
 332         {DEMOD_WRITE, 0x38, 0x50},
 333         {DEMOD_WRITE, 0x39, 0x68},
 334         {DEMOD_WRITE, 0x3c, 0x7f},
 335         {DEMOD_WRITE, 0x3d, 0x0f},
 336         {DEMOD_WRITE, 0x45, 0x20},
 337         {DEMOD_WRITE, 0x46, 0x24},
 338         {DEMOD_WRITE, 0x47, 0x7c},
 339         {DEMOD_WRITE, 0x48, 0x16},
 340         {DEMOD_WRITE, 0x49, 0x04},
 341         {DEMOD_WRITE, 0x4a, 0x01},
 342         {DEMOD_WRITE, 0x4b, 0x78},
 343         {DEMOD_WRITE, 0X4d, 0xd2},
 344         {DEMOD_WRITE, 0x4e, 0x6d},
 345         {DEMOD_WRITE, 0x50, 0x30},
 346         {DEMOD_WRITE, 0x51, 0x30},
 347         {DEMOD_WRITE, 0x54, 0x7b},
 348         {DEMOD_WRITE, 0x56, 0x09},
 349         {DEMOD_WRITE, 0x58, 0x59},
 350         {DEMOD_WRITE, 0x59, 0x37},
 351         {DEMOD_WRITE, 0x63, 0xfa},
 352         {0xff, 0xaa, 0xff}
 353 };
 354
 355 static struct inittab fe_trigger[] = {
 356         {DEMOD_WRITE, 0x97, 0x04},
 357         {DEMOD_WRITE, 0x99, 0x77},
 358         {DEMOD_WRITE, 0x9b, 0x64},
 359         {DEMOD_WRITE, 0x9e, 0x00},
 360         {DEMOD_WRITE, 0x9f, 0xf8},
 361         {DEMOD_WRITE, 0x98, 0xff},
 362         {DEMOD_WRITE, 0xc0, 0x0f},
 363         {DEMOD_WRITE, 0x89, 0x01},
 364         {DEMOD_WRITE, 0x00, 0x00},
 365         {WRITE_DELAY, 0x0a, 0x00},
 366         {DEMOD_WRITE, 0x00, 0x01},
 367         {DEMOD_WRITE, 0x00, 0x00},
 368         {DEMOD_WRITE, 0x9a, 0xb0},
 369         {0xff, 0xaa, 0xff}
 370 };
 371
 372 static int m88rs2000_tab_set(struct m88rs2000_state *state,
 373                 struct inittab *tab)
 374 {
 375         int ret = 0;
 376         u8 i;
 377         if (tab == NULL)
 378                 return -EINVAL;
 379
 380         for (i = 0; i < 255; i++) {
 381                 switch (tab[i].cmd) {
 382                 case 0x01:
 383                         ret = m88rs2000_writereg(state, tab[i].reg,
 384                                 tab[i].val);
 385                         break;
 386                 case 0x10:
 387                         if (tab[i].reg > 0)
 388                                 mdelay(tab[i].reg);
 389                         break;
 390                 case 0xff:
 391                         if (tab[i].reg == 0xaa && tab[i].val == 0xff)
 392                                 return 0;
 393                         break;
 394                 case 0x00:
 395                         break;
 396                 default:
 397                         return -EINVAL;
 398                 }
 399                 if (ret < 0)
 400                         return -ENODEV;
 401         }
 402         return 0;
 403 }
 404
 405 static int m88rs2000_set_voltage(struct dvb_frontend *fe,
 406                                  enum fe_sec_voltage volt)
 407 {
 408         struct m88rs2000_state *state = fe->demodulator_priv;
 409         u8 data;
 410
 411         data = m88rs2000_readreg(state, 0xb2);
 412         data |= 0x03; /* bit0 V/H, bit1 off/on */
 413
 414         switch (volt) {
 415         case SEC_VOLTAGE_18:
 416                 data &= ~0x03;
 417                 break;
 418         case SEC_VOLTAGE_13:
 419                 data &= ~0x03;
 420                 data |= 0x01;
 421                 break;
 422         case SEC_VOLTAGE_OFF:
 423                 break;
 424         }
 425
 426         m88rs2000_writereg(state, 0xb2, data);
 427
 428         return 0;
 429 }
 430
 431 static int m88rs2000_init(struct dvb_frontend *fe)
 432 {
 433         struct m88rs2000_state *state = fe->demodulator_priv;
 434         int ret;
 435
 436         deb_info("m88rs2000: init chip\n");
 437         /* Setup frontend from shutdown/cold */
 438         if (state->config->inittab)
 439                 ret = m88rs2000_tab_set(state,
 440                                 (struct inittab *)state->config->inittab);
 441         else
 442                 ret = m88rs2000_tab_set(state, m88rs2000_setup);
 443
 444         return ret;
 445 }
 446
 447 static int m88rs2000_sleep(struct dvb_frontend *fe)
 448 {
 449         struct m88rs2000_state *state = fe->demodulator_priv;
 450         int ret;
 451         /* Shutdown the frondend */
 452         ret = m88rs2000_tab_set(state, m88rs2000_shutdown);
 453         return ret;
 454 }
 455
 456 static int m88rs2000_read_status(struct dvb_frontend *fe,
 457                                  enum fe_status *status)
 458 {
 459         struct m88rs2000_state *state = fe->demodulator_priv;
 460         u8 reg = m88rs2000_readreg(state, 0x8c);
 461
 462         *status = 0;
 463
 464         if ((reg & 0xee) == 0xee) {
 465                 *status = FE_HAS_CARRIER | FE_HAS_SIGNAL | FE_HAS_VITERBI
 466                         | FE_HAS_SYNC | FE_HAS_LOCK;
 467                 if (state->config->set_ts_params)
 468                         state->config->set_ts_params(fe, CALL_IS_READ);
 469         }
 470         return 0;
 471 }
 472
 473 static int m88rs2000_read_ber(struct dvb_frontend *fe, u32 *ber)
 474 {
 475         struct m88rs2000_state *state = fe->demodulator_priv;
 476         u8 tmp0, tmp1;
 477
 478         m88rs2000_writereg(state, 0x9a, 0x30);
 479         tmp0 = m88rs2000_readreg(state, 0xd8);
 480         if ((tmp0 & 0x10) != 0) {
 481                 m88rs2000_writereg(state, 0x9a, 0xb0);
 482                 *ber = 0xffffffff;
 483                 return 0;
 484         }
 485
 486         *ber = (m88rs2000_readreg(state, 0xd7) << 8) |
 487                 m88rs2000_readreg(state, 0xd6);
 488
 489         tmp1 = m88rs2000_readreg(state, 0xd9);
 490         m88rs2000_writereg(state, 0xd9, (tmp1 & ~7) | 4);
 491         /* needs twice */
 492         m88rs2000_writereg(state, 0xd8, (tmp0 & ~8) | 0x30);
 493         m88rs2000_writereg(state, 0xd8, (tmp0 & ~8) | 0x30);
 494         m88rs2000_writereg(state, 0x9a, 0xb0);
 495
 496         return 0;
 497 }
 498
 499 static int m88rs2000_read_signal_strength(struct dvb_frontend *fe,
 500         u16 *strength)
 501 {
 502         if (fe->ops.tuner_ops.get_rf_strength)
 503                 fe->ops.tuner_ops.get_rf_strength(fe, strength);
 504
 505         return 0;
 506 }
 507
 508 static int m88rs2000_read_snr(struct dvb_frontend *fe, u16 *snr)
 509 {
 510         struct m88rs2000_state *state = fe->demodulator_priv;
 511
 512         *snr = 512 * m88rs2000_readreg(state, 0x65);
 513
 514         return 0;
 515 }
 516
 517 static int m88rs2000_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 518 {
 519         struct m88rs2000_state *state = fe->demodulator_priv;
 520         u8 tmp;
 521
 522         *ucblocks = (m88rs2000_readreg(state, 0xd5) << 8) |
 523                         m88rs2000_readreg(state, 0xd4);
 524         tmp = m88rs2000_readreg(state, 0xd8);
 525         m88rs2000_writereg(state, 0xd8, tmp & ~0x20);
 526         /* needs two times */
 527         m88rs2000_writereg(state, 0xd8, tmp | 0x20);
 528         m88rs2000_writereg(state, 0xd8, tmp | 0x20);
 529
 530         return 0;
 531 }
 532
 533 static int m88rs2000_set_fec(struct m88rs2000_state *state,
 534                              enum fe_code_rate fec)
 535 {
 536         u8 fec_set, reg;
 537         int ret;
 538
 539         switch (fec) {
 540         case FEC_1_2:
 541                 fec_set = 0x8;
 542                 break;
 543         case FEC_2_3:
 544                 fec_set = 0x10;
 545                 break;
 546         case FEC_3_4:
 547                 fec_set = 0x20;
 548                 break;
 549         case FEC_5_6:
 550                 fec_set = 0x40;
 551                 break;
 552         case FEC_7_8:
 553                 fec_set = 0x80;
 554                 break;
 555         case FEC_AUTO:
 556         default:
 557                 fec_set = 0x0;
 558         }
 559
 560         reg = m88rs2000_readreg(state, 0x70);
 561         reg &= 0x7;
 562         ret = m88rs2000_writereg(state, 0x70, reg | fec_set);
 563
 564         ret |= m88rs2000_writereg(state, 0x76, 0x8);
 565
 566         return ret;
 567 }
 568
 569 static enum fe_code_rate m88rs2000_get_fec(struct m88rs2000_state *state)
 570 {
 571         u8 reg;
 572         m88rs2000_writereg(state, 0x9a, 0x30);
 573         reg = m88rs2000_readreg(state, 0x76);
 574         m88rs2000_writereg(state, 0x9a, 0xb0);
 575
 576         reg &= 0xf0;
 577         reg >>= 5;
 578
 579         switch (reg) {
 580         case 0x4:
 581                 return FEC_1_2;
 582         case 0x3:
 583                 return FEC_2_3;
 584         case 0x2:
 585                 return FEC_3_4;
 586         case 0x1:
 587                 return FEC_5_6;
 588         case 0x0:
 589                 return FEC_7_8;
 590         default:
 591                 break;
 592         }
 593
 594         return FEC_AUTO;
 595 }
 596
 597 static int m88rs2000_set_frontend(struct dvb_frontend *fe)
 598 {
 599         struct m88rs2000_state *state = fe->demodulator_priv;
 600         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 601         enum fe_status status = 0;
 602         int i, ret = 0;
 603         u32 tuner_freq;
 604         s16 offset = 0;
 605         u8 reg;
 606
 607         state->no_lock_count = 0;
 608
 609         if (c->delivery_system != SYS_DVBS) {
 610                 deb_info("%s: unsupported delivery system selected (%d)\n",
 611                          __func__, c->delivery_system);
 612                 return -EOPNOTSUPP;
 613         }
 614
 615         /* Set Tuner */
 616         if (fe->ops.tuner_ops.set_params)
 617                 ret = fe->ops.tuner_ops.set_params(fe);
 618
 619         if (ret < 0)
 620                 return -ENODEV;
 621
 622         if (fe->ops.tuner_ops.get_frequency) {
 623                 ret = fe->ops.tuner_ops.get_frequency(fe, &tuner_freq);
 624
 625                 if (ret < 0)
 626                         return -ENODEV;
 627
 628                 offset = (s16)((s32)tuner_freq - c->frequency);
 629         } else {
 630                 offset = 0;
 631         }
 632
 633         /* default mclk value 96.4285 * 2 * 1000 = 192857 */
 634         if (((c->frequency % 192857) >= (192857 - 3000)) ||
 635                                 (c->frequency % 192857) <= 3000)
 636                 ret = m88rs2000_writereg(state, 0x86, 0xc2);
 637         else
 638                 ret = m88rs2000_writereg(state, 0x86, 0xc6);
 639
 640         ret |= m88rs2000_set_carrieroffset(fe, offset);
 641         if (ret < 0)
 642                 return -ENODEV;
 643
 644         /* Reset demod by symbol rate */
 645         if (c->symbol_rate > 27500000)
 646                 ret = m88rs2000_writereg(state, 0xf1, 0xa4);
 647         else
 648                 ret = m88rs2000_writereg(state, 0xf1, 0xbf);
 649
 650         ret |= m88rs2000_tab_set(state, fe_reset);
 651         if (ret < 0)
 652                 return -ENODEV;
 653
 654         /* Set FEC */
 655         ret = m88rs2000_set_fec(state, c->fec_inner);
 656         ret |= m88rs2000_writereg(state, 0x85, 0x1);
 657         ret |= m88rs2000_writereg(state, 0x8a, 0xbf);
 658         ret |= m88rs2000_writereg(state, 0x8d, 0x1e);
 659         ret |= m88rs2000_writereg(state, 0x90, 0xf1);
 660         ret |= m88rs2000_writereg(state, 0x91, 0x08);
 661
 662         if (ret < 0)
 663                 return -ENODEV;
 664
 665         /* Set Symbol Rate */
 666         ret = m88rs2000_set_symbolrate(fe, c->symbol_rate);
 667         if (ret < 0)
 668                 return -ENODEV;
 669
 670         /* Set up Demod */
 671         ret = m88rs2000_tab_set(state, fe_trigger);
 672         if (ret < 0)
 673                 return -ENODEV;
 674
 675         for (i = 0; i < 25; i++) {
 676                 reg = m88rs2000_readreg(state, 0x8c);
 677                 if ((reg & 0xee) == 0xee) {
 678                         status = FE_HAS_LOCK;
 679                         break;
 680                 }
 681                 state->no_lock_count++;
 682                 if (state->no_lock_count == 15) {
 683                         reg = m88rs2000_readreg(state, 0x70);
 684                         reg ^= 0x4;
 685                         m88rs2000_writereg(state, 0x70, reg);
 686                         state->no_lock_count = 0;
 687                 }
 688                 msleep(20);
 689         }
 690
 691         if (status & FE_HAS_LOCK) {
 692                 state->fec_inner = m88rs2000_get_fec(state);
 693                 /* Unknown suspect SNR level */
 694                 reg = m88rs2000_readreg(state, 0x65);
 695         }
 696
 697         state->tuner_frequency = c->frequency;
 698         state->symbol_rate = c->symbol_rate;
 699         return 0;
 700 }
 701
 702 static int m88rs2000_get_frontend(struct dvb_frontend *fe,
 703                                   struct dtv_frontend_properties *c)
 704 {
 705         struct m88rs2000_state *state = fe->demodulator_priv;
 706
 707         c->fec_inner = state->fec_inner;
 708         c->frequency = state->tuner_frequency;
 709         c->symbol_rate = state->symbol_rate;
 710         return 0;
 711 }
 712
 713 static int m88rs2000_get_tune_settings(struct dvb_frontend *fe,
 714         struct dvb_frontend_tune_settings *tune)
 715 {
 716         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 717
 718         if (c->symbol_rate > 3000000)
 719                 tune->min_delay_ms = 2000;
 720         else
 721                 tune->min_delay_ms = 3000;
 722
 723         tune->step_size = c->symbol_rate / 16000;
 724         tune->max_drift = c->symbol_rate / 2000;
 725
 726         return 0;
 727 }
 728
 729 static int m88rs2000_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 730 {
 731         struct m88rs2000_state *state = fe->demodulator_priv;
 732
 733         if (enable)
 734                 m88rs2000_writereg(state, 0x81, 0x84);
 735         else
 736                 m88rs2000_writereg(state, 0x81, 0x81);
 737         udelay(10);
 738         return 0;
 739 }
 740
 741 static void m88rs2000_release(struct dvb_frontend *fe)
 742 {
 743         struct m88rs2000_state *state = fe->demodulator_priv;
 744         kfree(state);
 745 }
 746
 747 static const struct dvb_frontend_ops m88rs2000_ops = {
 748         .delsys = { SYS_DVBS },
 749         .info = {
 750                 .name                   = "M88RS2000 DVB-S",
 751                 .frequency_min_hz       =  950 * MHz,
 752                 .frequency_max_hz       = 2150 * MHz,
 753                 .frequency_stepsize_hz  = 1 * MHz,
 754                 .frequency_tolerance_hz = 5 * MHz,
 755                 .symbol_rate_min        = 1000000,
 756                 .symbol_rate_max        = 45000000,
 757                 .symbol_rate_tolerance  = 500,  /* ppm */
 758                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 759                       FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 760                       FE_CAN_QPSK | FE_CAN_INVERSION_AUTO |
 761                       FE_CAN_FEC_AUTO
 762         },
 763
 764         .release = m88rs2000_release,
 765         .init = m88rs2000_init,
 766         .sleep = m88rs2000_sleep,
 767         .i2c_gate_ctrl = m88rs2000_i2c_gate_ctrl,
 768         .read_status = m88rs2000_read_status,
 769         .read_ber = m88rs2000_read_ber,
 770         .read_signal_strength = m88rs2000_read_signal_strength,
 771         .read_snr = m88rs2000_read_snr,
 772         .read_ucblocks = m88rs2000_read_ucblocks,
 773         .diseqc_send_master_cmd = m88rs2000_send_diseqc_msg,
 774         .diseqc_send_burst = m88rs2000_send_diseqc_burst,
 775         .set_tone = m88rs2000_set_tone,
 776         .set_voltage = m88rs2000_set_voltage,
 777
 778         .set_frontend = m88rs2000_set_frontend,
 779         .get_frontend = m88rs2000_get_frontend,
 780         .get_tune_settings = m88rs2000_get_tune_settings,
 781 };
 782
 783 struct dvb_frontend *m88rs2000_attach(const struct m88rs2000_config *config,
 784                                     struct i2c_adapter *i2c)
 785 {
 786         struct m88rs2000_state *state = NULL;
 787
 788         /* allocate memory for the internal state */
 789         state = kzalloc(sizeof(struct m88rs2000_state), GFP_KERNEL);
 790         if (state == NULL)
 791                 goto error;
 792
 793         /* setup the state */
 794         state->config = config;
 795         state->i2c = i2c;
 796         state->tuner_frequency = 0;
 797         state->symbol_rate = 0;
 798         state->fec_inner = 0;
 799
 800         /* create dvb_frontend */
 801         memcpy(&state->frontend.ops, &m88rs2000_ops,
 802                         sizeof(struct dvb_frontend_ops));
 803         state->frontend.demodulator_priv = state;
 804         return &state->frontend;
 805
 806 error:
 807         kfree(state);
 808
 809         return NULL;
 810 }
 811 EXPORT_SYMBOL(m88rs2000_attach);
 812
 813 MODULE_DESCRIPTION("M88RS2000 DVB-S Demodulator driver");
 814 MODULE_AUTHOR("Malcolm Priestley tvboxspy@gmail.com");
 815 MODULE_LICENSE("GPL");
 816 MODULE_VERSION("1.13");
 817