drivers/media/dvb-frontends/mt312.c

   1 /*
   2     Driver for Zarlink VP310/MT312/ZL10313 Satellite Channel Decoder
   3
   4     Copyright (C) 2003 Andreas Oberritter <obi@linuxtv.org>
   5     Copyright (C) 2008 Matthias Schwarzott <zzam@gentoo.org>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21
  22     References:
  23     http://products.zarlink.com/product_profiles/MT312.htm
  24     http://products.zarlink.com/product_profiles/SL1935.htm
  25 */
  26
  27 #include <linux/delay.h>
  28 #include <linux/errno.h>
  29 #include <linux/init.h>
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/string.h>
  33 #include <linux/slab.h>
  34
  35 #include "dvb_frontend.h"
  36 #include "mt312_priv.h"
  37 #include "mt312.h"
  38
  39 /* Max transfer size done by I2C transfer functions */
  40 #define MAX_XFER_SIZE  64
  41
  42 struct mt312_state {
  43         struct i2c_adapter *i2c;
  44         /* configuration settings */
  45         const struct mt312_config *config;
  46         struct dvb_frontend frontend;
  47
  48         u8 id;
  49         unsigned long xtal;
  50         u8 freq_mult;
  51 };
  52
  53 static int debug;
  54 #define dprintk(args...) \
  55         do { \
  56                 if (debug) \
  57                         printk(KERN_DEBUG "mt312: " args); \
  58         } while (0)
  59
  60 #define MT312_PLL_CLK           10000000UL      /* 10 MHz */
  61 #define MT312_PLL_CLK_10_111    10111000UL      /* 10.111 MHz */
  62
  63 static int mt312_read(struct mt312_state *state, const enum mt312_reg_addr reg,
  64                       u8 *buf, const size_t count)
  65 {
  66         int ret;
  67         struct i2c_msg msg[2];
  68         u8 regbuf[1] = { reg };
  69
  70         msg[0].addr = state->config->demod_address;
  71         msg[0].flags = 0;
  72         msg[0].buf = regbuf;
  73         msg[0].len = 1;
  74         msg[1].addr = state->config->demod_address;
  75         msg[1].flags = I2C_M_RD;
  76         msg[1].buf = buf;
  77         msg[1].len = count;
  78
  79         ret = i2c_transfer(state->i2c, msg, 2);
  80
  81         if (ret != 2) {
  82                 printk(KERN_DEBUG "%s: ret == %d\n", __func__, ret);
  83                 return -EREMOTEIO;
  84         }
  85
  86         if (debug) {
  87                 int i;
  88                 dprintk("R(%d):", reg & 0x7f);
  89                 for (i = 0; i < count; i++)
  90                         printk(KERN_CONT " %02x", buf[i]);
  91                 printk("\n");
  92         }
  93
  94         return 0;
  95 }
  96
  97 static int mt312_write(struct mt312_state *state, const enum mt312_reg_addr reg,
  98                        const u8 *src, const size_t count)
  99 {
 100         int ret;
 101         u8 buf[MAX_XFER_SIZE];
 102         struct i2c_msg msg;
 103
 104         if (1 + count > sizeof(buf)) {
 105                 printk(KERN_WARNING
 106                        "mt312: write: len=%zu is too big!\n", count);
 107                 return -EINVAL;
 108         }
 109
 110         if (debug) {
 111                 int i;
 112                 dprintk("W(%d):", reg & 0x7f);
 113                 for (i = 0; i < count; i++)
 114                         printk(KERN_CONT " %02x", src[i]);
 115                 printk("\n");
 116         }
 117
 118         buf[0] = reg;
 119         memcpy(&buf[1], src, count);
 120
 121         msg.addr = state->config->demod_address;
 122         msg.flags = 0;
 123         msg.buf = buf;
 124         msg.len = count + 1;
 125
 126         ret = i2c_transfer(state->i2c, &msg, 1);
 127
 128         if (ret != 1) {
 129                 dprintk("%s: ret == %d\n", __func__, ret);
 130                 return -EREMOTEIO;
 131         }
 132
 133         return 0;
 134 }
 135
 136 static inline int mt312_readreg(struct mt312_state *state,
 137                                 const enum mt312_reg_addr reg, u8 *val)
 138 {
 139         return mt312_read(state, reg, val, 1);
 140 }
 141
 142 static inline int mt312_writereg(struct mt312_state *state,
 143                                  const enum mt312_reg_addr reg, const u8 val)
 144 {
 145         return mt312_write(state, reg, &val, 1);
 146 }
 147
 148 static inline u32 mt312_div(u32 a, u32 b)
 149 {
 150         return (a + (b / 2)) / b;
 151 }
 152
 153 static int mt312_reset(struct mt312_state *state, const u8 full)
 154 {
 155         return mt312_writereg(state, RESET, full ? 0x80 : 0x40);
 156 }
 157
 158 static int mt312_get_inversion(struct mt312_state *state,
 159                                enum fe_spectral_inversion *i)
 160 {
 161         int ret;
 162         u8 vit_mode;
 163
 164         ret = mt312_readreg(state, VIT_MODE, &vit_mode);
 165         if (ret < 0)
 166                 return ret;
 167
 168         if (vit_mode & 0x80)    /* auto inversion was used */
 169                 *i = (vit_mode & 0x40) ? INVERSION_ON : INVERSION_OFF;
 170
 171         return 0;
 172 }
 173
 174 static int mt312_get_symbol_rate(struct mt312_state *state, u32 *sr)
 175 {
 176         int ret;
 177         u8 sym_rate_h;
 178         u8 dec_ratio;
 179         u16 sym_rat_op;
 180         u16 monitor;
 181         u8 buf[2];
 182
 183         ret = mt312_readreg(state, SYM_RATE_H, &sym_rate_h);
 184         if (ret < 0)
 185                 return ret;
 186
 187         if (sym_rate_h & 0x80) {
 188                 /* symbol rate search was used */
 189                 ret = mt312_writereg(state, MON_CTRL, 0x03);
 190                 if (ret < 0)
 191                         return ret;
 192
 193                 ret = mt312_read(state, MONITOR_H, buf, sizeof(buf));
 194                 if (ret < 0)
 195                         return ret;
 196
 197                 monitor = (buf[0] << 8) | buf[1];
 198
 199                 dprintk("sr(auto) = %u\n",
 200                        mt312_div(monitor * 15625, 4));
 201         } else {
 202                 ret = mt312_writereg(state, MON_CTRL, 0x05);
 203                 if (ret < 0)
 204                         return ret;
 205
 206                 ret = mt312_read(state, MONITOR_H, buf, sizeof(buf));
 207                 if (ret < 0)
 208                         return ret;
 209
 210                 dec_ratio = ((buf[0] >> 5) & 0x07) * 32;
 211
 212                 ret = mt312_read(state, SYM_RAT_OP_H, buf, sizeof(buf));
 213                 if (ret < 0)
 214                         return ret;
 215
 216                 sym_rat_op = (buf[0] << 8) | buf[1];
 217
 218                 dprintk("sym_rat_op=%d dec_ratio=%d\n",
 219                        sym_rat_op, dec_ratio);
 220                 dprintk("*sr(manual) = %lu\n",
 221                        (((state->xtal * 8192) / (sym_rat_op + 8192)) *
 222                         2) - dec_ratio);
 223         }
 224
 225         return 0;
 226 }
 227
 228 static int mt312_get_code_rate(struct mt312_state *state, enum fe_code_rate *cr)
 229 {
 230         const enum fe_code_rate fec_tab[8] =
 231             { FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_6_7, FEC_7_8,
 232                 FEC_AUTO, FEC_AUTO };
 233
 234         int ret;
 235         u8 fec_status;
 236
 237         ret = mt312_readreg(state, FEC_STATUS, &fec_status);
 238         if (ret < 0)
 239                 return ret;
 240
 241         *cr = fec_tab[(fec_status >> 4) & 0x07];
 242
 243         return 0;
 244 }
 245
 246 static int mt312_initfe(struct dvb_frontend *fe)
 247 {
 248         struct mt312_state *state = fe->demodulator_priv;
 249         int ret;
 250         u8 buf[2];
 251
 252         /* wake up */
 253         ret = mt312_writereg(state, CONFIG,
 254                         (state->freq_mult == 6 ? 0x88 : 0x8c));
 255         if (ret < 0)
 256                 return ret;
 257
 258         /* wait at least 150 usec */
 259         udelay(150);
 260
 261         /* full reset */
 262         ret = mt312_reset(state, 1);
 263         if (ret < 0)
 264                 return ret;
 265
 266 /* Per datasheet, write correct values. 09/28/03 ACCJr.
 267  * If we don't do this, we won't get FE_HAS_VITERBI in the VP310. */
 268         {
 269                 u8 buf_def[8] = { 0x14, 0x12, 0x03, 0x02,
 270                                   0x01, 0x00, 0x00, 0x00 };
 271
 272                 ret = mt312_write(state, VIT_SETUP, buf_def, sizeof(buf_def));
 273                 if (ret < 0)
 274                         return ret;
 275         }
 276
 277         switch (state->id) {
 278         case ID_ZL10313:
 279                 /* enable ADC */
 280                 ret = mt312_writereg(state, GPP_CTRL, 0x80);
 281                 if (ret < 0)
 282                         return ret;
 283
 284                 /* configure ZL10313 for optimal ADC performance */
 285                 buf[0] = 0x80;
 286                 buf[1] = 0xB0;
 287                 ret = mt312_write(state, HW_CTRL, buf, 2);
 288                 if (ret < 0)
 289                         return ret;
 290
 291                 /* enable MPEG output and ADCs */
 292                 ret = mt312_writereg(state, HW_CTRL, 0x00);
 293                 if (ret < 0)
 294                         return ret;
 295
 296                 ret = mt312_writereg(state, MPEG_CTRL, 0x00);
 297                 if (ret < 0)
 298                         return ret;
 299
 300                 break;
 301         }
 302
 303         /* SYS_CLK */
 304         buf[0] = mt312_div(state->xtal * state->freq_mult * 2, 1000000);
 305
 306         /* DISEQC_RATIO */
 307         buf[1] = mt312_div(state->xtal, 22000 * 4);
 308
 309         ret = mt312_write(state, SYS_CLK, buf, sizeof(buf));
 310         if (ret < 0)
 311                 return ret;
 312
 313         ret = mt312_writereg(state, SNR_THS_HIGH, 0x32);
 314         if (ret < 0)
 315                 return ret;
 316
 317         /* different MOCLK polarity */
 318         switch (state->id) {
 319         case ID_ZL10313:
 320                 buf[0] = 0x33;
 321                 break;
 322         default:
 323                 buf[0] = 0x53;
 324                 break;
 325         }
 326
 327         ret = mt312_writereg(state, OP_CTRL, buf[0]);
 328         if (ret < 0)
 329                 return ret;
 330
 331         /* TS_SW_LIM */
 332         buf[0] = 0x8c;
 333         buf[1] = 0x98;
 334
 335         ret = mt312_write(state, TS_SW_LIM_L, buf, sizeof(buf));
 336         if (ret < 0)
 337                 return ret;
 338
 339         ret = mt312_writereg(state, CS_SW_LIM, 0x69);
 340         if (ret < 0)
 341                 return ret;
 342
 343         return 0;
 344 }
 345
 346 static int mt312_send_master_cmd(struct dvb_frontend *fe,
 347                                  struct dvb_diseqc_master_cmd *c)
 348 {
 349         struct mt312_state *state = fe->demodulator_priv;
 350         int ret;
 351         u8 diseqc_mode;
 352
 353         if ((c->msg_len == 0) || (c->msg_len > sizeof(c->msg)))
 354                 return -EINVAL;
 355
 356         ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode);
 357         if (ret < 0)
 358                 return ret;
 359
 360         ret = mt312_write(state, (0x80 | DISEQC_INSTR), c->msg, c->msg_len);
 361         if (ret < 0)
 362                 return ret;
 363
 364         ret = mt312_writereg(state, DISEQC_MODE,
 365                              (diseqc_mode & 0x40) | ((c->msg_len - 1) << 3)
 366                              | 0x04);
 367         if (ret < 0)
 368                 return ret;
 369
 370         /* is there a better way to wait for message to be transmitted */
 371         msleep(100);
 372
 373         /* set DISEQC_MODE[2:0] to zero if a return message is expected */
 374         if (c->msg[0] & 0x02) {
 375                 ret = mt312_writereg(state, DISEQC_MODE, (diseqc_mode & 0x40));
 376                 if (ret < 0)
 377                         return ret;
 378         }
 379
 380         return 0;
 381 }
 382
 383 static int mt312_send_burst(struct dvb_frontend *fe,
 384                             const enum fe_sec_mini_cmd c)
 385 {
 386         struct mt312_state *state = fe->demodulator_priv;
 387         const u8 mini_tab[2] = { 0x02, 0x03 };
 388
 389         int ret;
 390         u8 diseqc_mode;
 391
 392         if (c > SEC_MINI_B)
 393                 return -EINVAL;
 394
 395         ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode);
 396         if (ret < 0)
 397                 return ret;
 398
 399         ret = mt312_writereg(state, DISEQC_MODE,
 400                              (diseqc_mode & 0x40) | mini_tab[c]);
 401         if (ret < 0)
 402                 return ret;
 403
 404         return 0;
 405 }
 406
 407 static int mt312_set_tone(struct dvb_frontend *fe,
 408                           const enum fe_sec_tone_mode t)
 409 {
 410         struct mt312_state *state = fe->demodulator_priv;
 411         const u8 tone_tab[2] = { 0x01, 0x00 };
 412
 413         int ret;
 414         u8 diseqc_mode;
 415
 416         if (t > SEC_TONE_OFF)
 417                 return -EINVAL;
 418
 419         ret = mt312_readreg(state, DISEQC_MODE, &diseqc_mode);
 420         if (ret < 0)
 421                 return ret;
 422
 423         ret = mt312_writereg(state, DISEQC_MODE,
 424                              (diseqc_mode & 0x40) | tone_tab[t]);
 425         if (ret < 0)
 426                 return ret;
 427
 428         return 0;
 429 }
 430
 431 static int mt312_set_voltage(struct dvb_frontend *fe,
 432                              const enum fe_sec_voltage v)
 433 {
 434         struct mt312_state *state = fe->demodulator_priv;
 435         const u8 volt_tab[3] = { 0x00, 0x40, 0x00 };
 436         u8 val;
 437
 438         if (v > SEC_VOLTAGE_OFF)
 439                 return -EINVAL;
 440
 441         val = volt_tab[v];
 442         if (state->config->voltage_inverted)
 443                 val ^= 0x40;
 444
 445         return mt312_writereg(state, DISEQC_MODE, val);
 446 }
 447
 448 static int mt312_read_status(struct dvb_frontend *fe, enum fe_status *s)
 449 {
 450         struct mt312_state *state = fe->demodulator_priv;
 451         int ret;
 452         u8 status[3];
 453
 454         *s = 0;
 455
 456         ret = mt312_read(state, QPSK_STAT_H, status, sizeof(status));
 457         if (ret < 0)
 458                 return ret;
 459
 460         dprintk("QPSK_STAT_H: 0x%02x, QPSK_STAT_L: 0x%02x, FEC_STATUS: 0x%02x\n",
 461                 status[0], status[1], status[2]);
 462
 463         if (status[0] & 0xc0)
 464                 *s |= FE_HAS_SIGNAL;    /* signal noise ratio */
 465         if (status[0] & 0x04)
 466                 *s |= FE_HAS_CARRIER;   /* qpsk carrier lock */
 467         if (status[2] & 0x02)
 468                 *s |= FE_HAS_VITERBI;   /* viterbi lock */
 469         if (status[2] & 0x04)
 470                 *s |= FE_HAS_SYNC;      /* byte align lock */
 471         if (status[0] & 0x01)
 472                 *s |= FE_HAS_LOCK;      /* qpsk lock */
 473
 474         return 0;
 475 }
 476
 477 static int mt312_read_ber(struct dvb_frontend *fe, u32 *ber)
 478 {
 479         struct mt312_state *state = fe->demodulator_priv;
 480         int ret;
 481         u8 buf[3];
 482
 483         ret = mt312_read(state, RS_BERCNT_H, buf, 3);
 484         if (ret < 0)
 485                 return ret;
 486
 487         *ber = ((buf[0] << 16) | (buf[1] << 8) | buf[2]) * 64;
 488
 489         return 0;
 490 }
 491
 492 static int mt312_read_signal_strength(struct dvb_frontend *fe,
 493                                       u16 *signal_strength)
 494 {
 495         struct mt312_state *state = fe->demodulator_priv;
 496         int ret;
 497         u8 buf[3];
 498         u16 agc;
 499         s16 err_db;
 500
 501         ret = mt312_read(state, AGC_H, buf, sizeof(buf));
 502         if (ret < 0)
 503                 return ret;
 504
 505         agc = (buf[0] << 6) | (buf[1] >> 2);
 506         err_db = (s16) (((buf[1] & 0x03) << 14) | buf[2] << 6) >> 6;
 507
 508         *signal_strength = agc;
 509
 510         dprintk("agc=%08x err_db=%hd\n", agc, err_db);
 511
 512         return 0;
 513 }
 514
 515 static int mt312_read_snr(struct dvb_frontend *fe, u16 *snr)
 516 {
 517         struct mt312_state *state = fe->demodulator_priv;
 518         int ret;
 519         u8 buf[2];
 520
 521         ret = mt312_read(state, M_SNR_H, buf, sizeof(buf));
 522         if (ret < 0)
 523                 return ret;
 524
 525         *snr = 0xFFFF - ((((buf[0] & 0x7f) << 8) | buf[1]) << 1);
 526
 527         return 0;
 528 }
 529
 530 static int mt312_read_ucblocks(struct dvb_frontend *fe, u32 *ubc)
 531 {
 532         struct mt312_state *state = fe->demodulator_priv;
 533         int ret;
 534         u8 buf[2];
 535
 536         ret = mt312_read(state, RS_UBC_H, buf, sizeof(buf));
 537         if (ret < 0)
 538                 return ret;
 539
 540         *ubc = (buf[0] << 8) | buf[1];
 541
 542         return 0;
 543 }
 544
 545 static int mt312_set_frontend(struct dvb_frontend *fe)
 546 {
 547         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 548         struct mt312_state *state = fe->demodulator_priv;
 549         int ret;
 550         u8 buf[5], config_val;
 551         u16 sr;
 552
 553         const u8 fec_tab[10] =
 554             { 0x00, 0x01, 0x02, 0x04, 0x3f, 0x08, 0x10, 0x20, 0x3f, 0x3f };
 555         const u8 inv_tab[3] = { 0x00, 0x40, 0x80 };
 556
 557         dprintk("%s: Freq %d\n", __func__, p->frequency);
 558
 559         if ((p->frequency < fe->ops.info.frequency_min)
 560             || (p->frequency > fe->ops.info.frequency_max))
 561                 return -EINVAL;
 562
 563         if (((int)p->inversion < INVERSION_OFF)
 564             || (p->inversion > INVERSION_ON))
 565                 return -EINVAL;
 566
 567         if ((p->symbol_rate < fe->ops.info.symbol_rate_min)
 568             || (p->symbol_rate > fe->ops.info.symbol_rate_max))
 569                 return -EINVAL;
 570
 571         if (((int)p->fec_inner < FEC_NONE)
 572             || (p->fec_inner > FEC_AUTO))
 573                 return -EINVAL;
 574
 575         if ((p->fec_inner == FEC_4_5)
 576             || (p->fec_inner == FEC_8_9))
 577                 return -EINVAL;
 578
 579         switch (state->id) {
 580         case ID_VP310:
 581         /* For now we will do this only for the VP310.
 582          * It should be better for the mt312 as well,
 583          * but tuning will be slower. ACCJr 09/29/03
 584          */
 585                 ret = mt312_readreg(state, CONFIG, &config_val);
 586                 if (ret < 0)
 587                         return ret;
 588                 if (p->symbol_rate >= 30000000) {
 589                         /* Note that 30MS/s should use 90MHz */
 590                         if (state->freq_mult == 6) {
 591                                 /* We are running 60MHz */
 592                                 state->freq_mult = 9;
 593                                 ret = mt312_initfe(fe);
 594                                 if (ret < 0)
 595                                         return ret;
 596                         }
 597                 } else {
 598                         if (state->freq_mult == 9) {
 599                                 /* We are running 90MHz */
 600                                 state->freq_mult = 6;
 601                                 ret = mt312_initfe(fe);
 602                                 if (ret < 0)
 603                                         return ret;
 604                         }
 605                 }
 606                 break;
 607
 608         case ID_MT312:
 609         case ID_ZL10313:
 610                 break;
 611
 612         default:
 613                 return -EINVAL;
 614         }
 615
 616         if (fe->ops.tuner_ops.set_params) {
 617                 fe->ops.tuner_ops.set_params(fe);
 618                 if (fe->ops.i2c_gate_ctrl)
 619                         fe->ops.i2c_gate_ctrl(fe, 0);
 620         }
 621
 622         /* sr = (u16)(sr * 256.0 / 1000000.0) */
 623         sr = mt312_div(p->symbol_rate * 4, 15625);
 624
 625         /* SYM_RATE */
 626         buf[0] = (sr >> 8) & 0x3f;
 627         buf[1] = (sr >> 0) & 0xff;
 628
 629         /* VIT_MODE */
 630         buf[2] = inv_tab[p->inversion] | fec_tab[p->fec_inner];
 631
 632         /* QPSK_CTRL */
 633         buf[3] = 0x40;          /* swap I and Q before QPSK demodulation */
 634
 635         if (p->symbol_rate < 10000000)
 636                 buf[3] |= 0x04; /* use afc mode */
 637
 638         /* GO */
 639         buf[4] = 0x01;
 640
 641         ret = mt312_write(state, SYM_RATE_H, buf, sizeof(buf));
 642         if (ret < 0)
 643                 return ret;
 644
 645         mt312_reset(state, 0);
 646
 647         return 0;
 648 }
 649
 650 static int mt312_get_frontend(struct dvb_frontend *fe,
 651                               struct dtv_frontend_properties *p)
 652 {
 653         struct mt312_state *state = fe->demodulator_priv;
 654         int ret;
 655
 656         ret = mt312_get_inversion(state, &p->inversion);
 657         if (ret < 0)
 658                 return ret;
 659
 660         ret = mt312_get_symbol_rate(state, &p->symbol_rate);
 661         if (ret < 0)
 662                 return ret;
 663
 664         ret = mt312_get_code_rate(state, &p->fec_inner);
 665         if (ret < 0)
 666                 return ret;
 667
 668         return 0;
 669 }
 670
 671 static int mt312_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 672 {
 673         struct mt312_state *state = fe->demodulator_priv;
 674
 675         u8 val = 0x00;
 676         int ret;
 677
 678         switch (state->id) {
 679         case ID_ZL10313:
 680                 ret = mt312_readreg(state, GPP_CTRL, &val);
 681                 if (ret < 0)
 682                         goto error;
 683
 684                 /* preserve this bit to not accidentally shutdown ADC */
 685                 val &= 0x80;
 686                 break;
 687         }
 688
 689         if (enable)
 690                 val |= 0x40;
 691         else
 692                 val &= ~0x40;
 693
 694         ret = mt312_writereg(state, GPP_CTRL, val);
 695
 696 error:
 697         return ret;
 698 }
 699
 700 static int mt312_sleep(struct dvb_frontend *fe)
 701 {
 702         struct mt312_state *state = fe->demodulator_priv;
 703         int ret;
 704         u8 config;
 705
 706         /* reset all registers to defaults */
 707         ret = mt312_reset(state, 1);
 708         if (ret < 0)
 709                 return ret;
 710
 711         if (state->id == ID_ZL10313) {
 712                 /* reset ADC */
 713                 ret = mt312_writereg(state, GPP_CTRL, 0x00);
 714                 if (ret < 0)
 715                         return ret;
 716
 717                 /* full shutdown of ADCs, mpeg bus tristated */
 718                 ret = mt312_writereg(state, HW_CTRL, 0x0d);
 719                 if (ret < 0)
 720                         return ret;
 721         }
 722
 723         ret = mt312_readreg(state, CONFIG, &config);
 724         if (ret < 0)
 725                 return ret;
 726
 727         /* enter standby */
 728         ret = mt312_writereg(state, CONFIG, config & 0x7f);
 729         if (ret < 0)
 730                 return ret;
 731
 732         return 0;
 733 }
 734
 735 static int mt312_get_tune_settings(struct dvb_frontend *fe,
 736                 struct dvb_frontend_tune_settings *fesettings)
 737 {
 738         fesettings->min_delay_ms = 50;
 739         fesettings->step_size = 0;
 740         fesettings->max_drift = 0;
 741         return 0;
 742 }
 743
 744 static void mt312_release(struct dvb_frontend *fe)
 745 {
 746         struct mt312_state *state = fe->demodulator_priv;
 747         kfree(state);
 748 }
 749
 750 #define MT312_SYS_CLK           90000000UL      /* 90 MHz */
 751 static const struct dvb_frontend_ops mt312_ops = {
 752         .delsys = { SYS_DVBS },
 753         .info = {
 754                 .name = "Zarlink ???? DVB-S",
 755                 .frequency_min = 950000,
 756                 .frequency_max = 2150000,
 757                 /* FIXME: adjust freq to real used xtal */
 758                 .frequency_stepsize = (MT312_PLL_CLK / 1000) / 128,
 759                 .symbol_rate_min = MT312_SYS_CLK / 128, /* FIXME as above */
 760                 .symbol_rate_max = MT312_SYS_CLK / 2,
 761                 .caps =
 762                     FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
 763                     FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 764                     FE_CAN_FEC_AUTO | FE_CAN_QPSK | FE_CAN_MUTE_TS |
 765                     FE_CAN_RECOVER
 766         },
 767
 768         .release = mt312_release,
 769
 770         .init = mt312_initfe,
 771         .sleep = mt312_sleep,
 772         .i2c_gate_ctrl = mt312_i2c_gate_ctrl,
 773
 774         .set_frontend = mt312_set_frontend,
 775         .get_frontend = mt312_get_frontend,
 776         .get_tune_settings = mt312_get_tune_settings,
 777
 778         .read_status = mt312_read_status,
 779         .read_ber = mt312_read_ber,
 780         .read_signal_strength = mt312_read_signal_strength,
 781         .read_snr = mt312_read_snr,
 782         .read_ucblocks = mt312_read_ucblocks,
 783
 784         .diseqc_send_master_cmd = mt312_send_master_cmd,
 785         .diseqc_send_burst = mt312_send_burst,
 786         .set_tone = mt312_set_tone,
 787         .set_voltage = mt312_set_voltage,
 788 };
 789
 790 struct dvb_frontend *mt312_attach(const struct mt312_config *config,
 791                                         struct i2c_adapter *i2c)
 792 {
 793         struct mt312_state *state = NULL;
 794
 795         /* allocate memory for the internal state */
 796         state = kzalloc(sizeof(struct mt312_state), GFP_KERNEL);
 797         if (state == NULL)
 798                 goto error;
 799
 800         /* setup the state */
 801         state->config = config;
 802         state->i2c = i2c;
 803
 804         /* check if the demod is there */
 805         if (mt312_readreg(state, ID, &state->id) < 0)
 806                 goto error;
 807
 808         /* create dvb_frontend */
 809         memcpy(&state->frontend.ops, &mt312_ops,
 810                 sizeof(struct dvb_frontend_ops));
 811         state->frontend.demodulator_priv = state;
 812
 813         switch (state->id) {
 814         case ID_VP310:
 815                 strcpy(state->frontend.ops.info.name, "Zarlink VP310 DVB-S");
 816                 state->xtal = MT312_PLL_CLK;
 817                 state->freq_mult = 9;
 818                 break;
 819         case ID_MT312:
 820                 strcpy(state->frontend.ops.info.name, "Zarlink MT312 DVB-S");
 821                 state->xtal = MT312_PLL_CLK;
 822                 state->freq_mult = 6;
 823                 break;
 824         case ID_ZL10313:
 825                 strcpy(state->frontend.ops.info.name, "Zarlink ZL10313 DVB-S");
 826                 state->xtal = MT312_PLL_CLK_10_111;
 827                 state->freq_mult = 9;
 828                 break;
 829         default:
 830                 printk(KERN_WARNING "Only Zarlink VP310/MT312/ZL10313 are supported chips.\n");
 831                 goto error;
 832         }
 833
 834         return &state->frontend;
 835
 836 error:
 837         kfree(state);
 838         return NULL;
 839 }
 840 EXPORT_SYMBOL(mt312_attach);
 841
 842 module_param(debug, int, 0644);
 843 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 844
 845 MODULE_DESCRIPTION("Zarlink VP310/MT312/ZL10313 DVB-S Demodulator driver");
 846 MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
 847 MODULE_AUTHOR("Matthias Schwarzott <zzam@gentoo.org>");
 848 MODULE_LICENSE("GPL");
 849