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   1 /*
   2  *  Driver for Conexant CX24113/CX24128 Tuner (Satellite)
   3  *
   4  *  Copyright (C) 2007-8 Patrick Boettcher <pb@linuxtv.org>
   5  *
   6  *  Developed for BBTI / Technisat
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/slab.h>
  25 #include <linux/kernel.h>
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28
  29 #include "dvb_frontend.h"
  30 #include "cx24113.h"
  31
  32 static int debug;
  33
  34 #define info(args...) do { printk(KERN_INFO "CX24113: " args); } while (0)
  35 #define err(args...)  do { printk(KERN_ERR  "CX24113: " args); } while (0)
  36
  37 #define dprintk(args...) \
  38         do { \
  39                 if (debug) { \
  40                         printk(KERN_DEBUG "CX24113: %s: ", __func__); \
  41                         printk(args); \
  42                 } \
  43         } while (0)
  44
  45 struct cx24113_state {
  46         struct i2c_adapter *i2c;
  47         const struct cx24113_config *config;
  48
  49 #define REV_CX24113 0x23
  50         u8 rev;
  51         u8 ver;
  52
  53         u8 icp_mode:1;
  54
  55 #define ICP_LEVEL1 0
  56 #define ICP_LEVEL2 1
  57 #define ICP_LEVEL3 2
  58 #define ICP_LEVEL4 3
  59         u8 icp_man:2;
  60         u8 icp_auto_low:2;
  61         u8 icp_auto_mlow:2;
  62         u8 icp_auto_mhi:2;
  63         u8 icp_auto_hi:2;
  64         u8 icp_dig;
  65
  66 #define LNA_MIN_GAIN 0
  67 #define LNA_MID_GAIN 1
  68 #define LNA_MAX_GAIN 2
  69         u8 lna_gain:2;
  70
  71         u8 acp_on:1;
  72
  73         u8 vco_mode:2;
  74         u8 vco_shift:1;
  75 #define VCOBANDSEL_6 0x80
  76 #define VCOBANDSEL_5 0x01
  77 #define VCOBANDSEL_4 0x02
  78 #define VCOBANDSEL_3 0x04
  79 #define VCOBANDSEL_2 0x08
  80 #define VCOBANDSEL_1 0x10
  81         u8 vco_band;
  82
  83 #define VCODIV4 4
  84 #define VCODIV2 2
  85         u8 vcodiv;
  86
  87         u8 bs_delay:4;
  88         u16 bs_freqcnt:13;
  89         u16 bs_rdiv;
  90         u8 prescaler_mode:1;
  91
  92         u8 rfvga_bias_ctrl;
  93
  94         s16 tuner_gain_thres;
  95         u8  gain_level;
  96
  97         u32 frequency;
  98
  99         u8 refdiv;
 100
 101         u8 Fwindow_enabled;
 102 };
 103
 104 static int cx24113_writereg(struct cx24113_state *state, int reg, int data)
 105 {
 106         u8 buf[] = { reg, data };
 107         struct i2c_msg msg = { .addr = state->config->i2c_addr,
 108                 .flags = 0, .buf = buf, .len = 2 };
 109         int err = i2c_transfer(state->i2c, &msg, 1);
 110         if (err != 1) {
 111                 printk(KERN_DEBUG "%s: writereg error(err == %i, reg == 0x%02x,"
 112                          " data == 0x%02x)\n", __func__, err, reg, data);
 113                 return err;
 114         }
 115
 116         return 0;
 117 }
 118
 119 static int cx24113_readreg(struct cx24113_state *state, u8 reg)
 120 {
 121         int ret;
 122         u8 b;
 123         struct i2c_msg msg[] = {
 124                 { .addr = state->config->i2c_addr,
 125                         .flags = 0, .buf = &reg, .len = 1 },
 126                 { .addr = state->config->i2c_addr,
 127                         .flags = I2C_M_RD, .buf = &b, .len = 1 }
 128         };
 129
 130         ret = i2c_transfer(state->i2c, msg, 2);
 131
 132         if (ret != 2) {
 133                 printk(KERN_DEBUG "%s: reg=0x%x (error=%d)\n",
 134                         __func__, reg, ret);
 135                 return ret;
 136         }
 137
 138         return b;
 139 }
 140
 141 static void cx24113_set_parameters(struct cx24113_state *state)
 142 {
 143         u8 r;
 144
 145         r = cx24113_readreg(state, 0x10) & 0x82;
 146         r |= state->icp_mode;
 147         r |= state->icp_man << 4;
 148         r |= state->icp_dig << 2;
 149         r |= state->prescaler_mode << 5;
 150         cx24113_writereg(state, 0x10, r);
 151
 152         r = (state->icp_auto_low  << 0) | (state->icp_auto_mlow << 2)
 153                 | (state->icp_auto_mhi << 4) | (state->icp_auto_hi << 6);
 154         cx24113_writereg(state, 0x11, r);
 155
 156         if (state->rev == REV_CX24113) {
 157                 r = cx24113_readreg(state, 0x20) & 0xec;
 158                 r |= state->lna_gain;
 159                 r |= state->rfvga_bias_ctrl << 4;
 160                 cx24113_writereg(state, 0x20, r);
 161         }
 162
 163         r = cx24113_readreg(state, 0x12) & 0x03;
 164         r |= state->acp_on << 2;
 165         r |= state->bs_delay << 4;
 166         cx24113_writereg(state, 0x12, r);
 167
 168         r = cx24113_readreg(state, 0x18) & 0x40;
 169         r |= state->vco_shift;
 170         if (state->vco_band == VCOBANDSEL_6)
 171                 r |= (1 << 7);
 172         else
 173                 r |= (state->vco_band << 1);
 174         cx24113_writereg(state, 0x18, r);
 175
 176         r  = cx24113_readreg(state, 0x14) & 0x20;
 177         r |= (state->vco_mode << 6) | ((state->bs_freqcnt >> 8) & 0x1f);
 178         cx24113_writereg(state, 0x14, r);
 179         cx24113_writereg(state, 0x15, (state->bs_freqcnt        & 0xff));
 180
 181         cx24113_writereg(state, 0x16, (state->bs_rdiv >> 4) & 0xff);
 182         r = (cx24113_readreg(state, 0x17) & 0x0f) |
 183                 ((state->bs_rdiv & 0x0f) << 4);
 184         cx24113_writereg(state, 0x17, r);
 185 }
 186
 187 #define VGA_0 0x00
 188 #define VGA_1 0x04
 189 #define VGA_2 0x02
 190 #define VGA_3 0x06
 191 #define VGA_4 0x01
 192 #define VGA_5 0x05
 193 #define VGA_6 0x03
 194 #define VGA_7 0x07
 195
 196 #define RFVGA_0 0x00
 197 #define RFVGA_1 0x01
 198 #define RFVGA_2 0x02
 199 #define RFVGA_3 0x03
 200
 201 static int cx24113_set_gain_settings(struct cx24113_state *state,
 202                 s16 power_estimation)
 203 {
 204         u8 ampout = cx24113_readreg(state, 0x1d) & 0xf0,
 205            vga    = cx24113_readreg(state, 0x1f) & 0x3f,
 206            rfvga  = cx24113_readreg(state, 0x20) & 0xf3;
 207         u8 gain_level = power_estimation >= state->tuner_gain_thres;
 208
 209         dprintk("power estimation: %d, thres: %d, gain_level: %d/%d\n",
 210                         power_estimation, state->tuner_gain_thres,
 211                         state->gain_level, gain_level);
 212
 213         if (gain_level == state->gain_level)
 214                 return 0; /* nothing to be done */
 215
 216         ampout |= 0xf;
 217
 218         if (gain_level) {
 219                 rfvga |= RFVGA_0 << 2;
 220                 vga   |= (VGA_7 << 3) | VGA_7;
 221         } else {
 222                 rfvga |= RFVGA_2 << 2;
 223                 vga  |= (VGA_6 << 3) | VGA_2;
 224         }
 225         state->gain_level = gain_level;
 226
 227         cx24113_writereg(state, 0x1d, ampout);
 228         cx24113_writereg(state, 0x1f, vga);
 229         cx24113_writereg(state, 0x20, rfvga);
 230
 231         return 1; /* did something */
 232 }
 233
 234 static int cx24113_set_Fref(struct cx24113_state *state, u8 high)
 235 {
 236         u8 xtal = cx24113_readreg(state, 0x02);
 237         if (state->rev == 0x43 && state->vcodiv == VCODIV4)
 238                 high = 1;
 239
 240         xtal &= ~0x2;
 241         if (high)
 242                 xtal |= high << 1;
 243         return cx24113_writereg(state, 0x02, xtal);
 244 }
 245
 246 static int cx24113_enable(struct cx24113_state *state, u8 enable)
 247 {
 248         u8 r21 = (cx24113_readreg(state, 0x21) & 0xc0) | enable;
 249         if (state->rev == REV_CX24113)
 250                 r21 |= (1 << 1);
 251         return cx24113_writereg(state, 0x21, r21);
 252 }
 253
 254 static int cx24113_set_bandwidth(struct cx24113_state *state, u32 bandwidth_khz)
 255 {
 256         u8 r;
 257
 258         if (bandwidth_khz <= 19000)
 259                 r = 0x03 << 6;
 260         else if (bandwidth_khz <= 25000)
 261                 r = 0x02 << 6;
 262         else
 263                 r = 0x01 << 6;
 264
 265         dprintk("bandwidth to be set: %d\n", bandwidth_khz);
 266         bandwidth_khz *= 10;
 267         bandwidth_khz -= 10000;
 268         bandwidth_khz /= 1000;
 269         bandwidth_khz += 5;
 270         bandwidth_khz /= 10;
 271
 272         dprintk("bandwidth: %d %d\n", r >> 6, bandwidth_khz);
 273
 274         r |= bandwidth_khz & 0x3f;
 275
 276         return cx24113_writereg(state, 0x1e, r);
 277 }
 278
 279 static int cx24113_set_clk_inversion(struct cx24113_state *state, u8 on)
 280 {
 281         u8 r = (cx24113_readreg(state, 0x10) & 0x7f) | ((on & 0x1) << 7);
 282         return cx24113_writereg(state, 0x10, r);
 283 }
 284
 285 static int cx24113_get_status(struct dvb_frontend *fe, u32 *status)
 286 {
 287         struct cx24113_state *state = fe->tuner_priv;
 288         u8 r = (cx24113_readreg(state, 0x10) & 0x02) >> 1;
 289         if (r)
 290                 *status |= TUNER_STATUS_LOCKED;
 291         dprintk("PLL locked: %d\n", r);
 292         return 0;
 293 }
 294
 295 static u8 cx24113_set_ref_div(struct cx24113_state *state, u8 refdiv)
 296 {
 297         if (state->rev == 0x43 && state->vcodiv == VCODIV4)
 298                 refdiv = 2;
 299         return state->refdiv = refdiv;
 300 }
 301
 302 static void cx24113_calc_pll_nf(struct cx24113_state *state, u16 *n, s32 *f)
 303 {
 304         s32 N;
 305         s64 F;
 306         u64 dividend;
 307         u8 R, r;
 308         u8 vcodiv;
 309         u8 factor;
 310         s32 freq_hz = state->frequency * 1000;
 311
 312         if (state->config->xtal_khz < 20000)
 313                 factor = 1;
 314         else
 315                 factor = 2;
 316
 317         if (state->rev == REV_CX24113) {
 318                 if (state->frequency >= 1100000)
 319                         vcodiv = VCODIV2;
 320                 else
 321                         vcodiv = VCODIV4;
 322         } else {
 323                 if (state->frequency >= 1165000)
 324                         vcodiv = VCODIV2;
 325                 else
 326                         vcodiv = VCODIV4;
 327         }
 328         state->vcodiv = vcodiv;
 329
 330         dprintk("calculating N/F for %dHz with vcodiv %d\n", freq_hz, vcodiv);
 331         R = 0;
 332         do {
 333                 R = cx24113_set_ref_div(state, R + 1);
 334
 335                 /* calculate tuner PLL settings: */
 336                 N =  (freq_hz / 100 * vcodiv) * R;
 337                 N /= (state->config->xtal_khz) * factor * 2;
 338                 N += 5;     /* For round up. */
 339                 N /= 10;
 340                 N -= 32;
 341         } while (N < 6 && R < 3);
 342
 343         if (N < 6) {
 344                 err("strange frequency: N < 6\n");
 345                 return;
 346         }
 347         F = freq_hz;
 348         F *= (u64) (R * vcodiv * 262144);
 349         dprintk("1 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
 350         /* do_div needs an u64 as first argument */
 351         dividend = F;
 352         do_div(dividend, state->config->xtal_khz * 1000 * factor * 2);
 353         F = dividend;
 354         dprintk("2 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
 355         F -= (N + 32) * 262144;
 356
 357         dprintk("3 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
 358
 359         if (state->Fwindow_enabled) {
 360                 if (F > (262144 / 2 - 1638))
 361                         F = 262144 / 2 - 1638;
 362                 if (F < (-262144 / 2 + 1638))
 363                         F = -262144 / 2 + 1638;
 364                 if ((F < 3277 && F > 0) || (F > -3277 && F < 0)) {
 365                         F = 0;
 366                         r = cx24113_readreg(state, 0x10);
 367                         cx24113_writereg(state, 0x10, r | (1 << 6));
 368                 }
 369         }
 370         dprintk("4 N: %d, F: %lld, R: %d\n", N, (long long)F, R);
 371
 372         *n = (u16) N;
 373         *f = (s32) F;
 374 }
 375
 376
 377 static void cx24113_set_nfr(struct cx24113_state *state, u16 n, s32 f, u8 r)
 378 {
 379         u8 reg;
 380         cx24113_writereg(state, 0x19, (n >> 1) & 0xff);
 381
 382         reg = ((n & 0x1) << 7) | ((f >> 11) & 0x7f);
 383         cx24113_writereg(state, 0x1a, reg);
 384
 385         cx24113_writereg(state, 0x1b, (f >> 3) & 0xff);
 386
 387         reg = cx24113_readreg(state, 0x1c) & 0x1f;
 388         cx24113_writereg(state, 0x1c, reg | ((f & 0x7) << 5));
 389
 390         cx24113_set_Fref(state, r - 1);
 391 }
 392
 393 static int cx24113_set_frequency(struct cx24113_state *state, u32 frequency)
 394 {
 395         u8 r = 1; /* or 2 */
 396         u16 n = 6;
 397         s32 f = 0;
 398
 399         r = cx24113_readreg(state, 0x14);
 400         cx24113_writereg(state, 0x14, r & 0x3f);
 401
 402         r = cx24113_readreg(state, 0x10);
 403         cx24113_writereg(state, 0x10, r & 0xbf);
 404
 405         state->frequency = frequency;
 406
 407         dprintk("tuning to frequency: %d\n", frequency);
 408
 409         cx24113_calc_pll_nf(state, &n, &f);
 410         cx24113_set_nfr(state, n, f, state->refdiv);
 411
 412         r = cx24113_readreg(state, 0x18) & 0xbf;
 413         if (state->vcodiv != VCODIV2)
 414                 r |= 1 << 6;
 415         cx24113_writereg(state, 0x18, r);
 416
 417         /* The need for this sleep is not clear. But helps in some cases */
 418         msleep(5);
 419
 420         r = cx24113_readreg(state, 0x1c) & 0xef;
 421         cx24113_writereg(state, 0x1c, r | (1 << 4));
 422         return 0;
 423 }
 424
 425 static int cx24113_init(struct dvb_frontend *fe)
 426 {
 427         struct cx24113_state *state = fe->tuner_priv;
 428         int ret;
 429
 430         state->tuner_gain_thres = -50;
 431         state->gain_level = 255; /* to force a gain-setting initialization */
 432         state->icp_mode = 0;
 433
 434         if (state->config->xtal_khz < 11000) {
 435                 state->icp_auto_hi  = ICP_LEVEL4;
 436                 state->icp_auto_mhi  = ICP_LEVEL4;
 437                 state->icp_auto_mlow = ICP_LEVEL3;
 438                 state->icp_auto_low = ICP_LEVEL3;
 439         } else {
 440                 state->icp_auto_hi  = ICP_LEVEL4;
 441                 state->icp_auto_mhi  = ICP_LEVEL4;
 442                 state->icp_auto_mlow = ICP_LEVEL3;
 443                 state->icp_auto_low = ICP_LEVEL2;
 444         }
 445
 446         state->icp_dig = ICP_LEVEL3;
 447         state->icp_man = ICP_LEVEL1;
 448         state->acp_on  = 1;
 449         state->vco_mode = 0;
 450         state->vco_shift = 0;
 451         state->vco_band = VCOBANDSEL_1;
 452         state->bs_delay = 8;
 453         state->bs_freqcnt = 0x0fff;
 454         state->bs_rdiv = 0x0fff;
 455         state->prescaler_mode = 0;
 456         state->lna_gain = LNA_MAX_GAIN;
 457         state->rfvga_bias_ctrl = 1;
 458         state->Fwindow_enabled = 1;
 459
 460         cx24113_set_Fref(state, 0);
 461         cx24113_enable(state, 0x3d);
 462         cx24113_set_parameters(state);
 463
 464         cx24113_set_gain_settings(state, -30);
 465
 466         cx24113_set_bandwidth(state, 18025);
 467         cx24113_set_clk_inversion(state, 1);
 468
 469         if (state->config->xtal_khz >= 40000)
 470                 ret = cx24113_writereg(state, 0x02,
 471                         (cx24113_readreg(state, 0x02) & 0xfb) | (1 << 2));
 472         else
 473                 ret = cx24113_writereg(state, 0x02,
 474                         (cx24113_readreg(state, 0x02) & 0xfb) | (0 << 2));
 475
 476         return ret;
 477 }
 478
 479 static int cx24113_set_params(struct dvb_frontend *fe,
 480                 struct dvb_frontend_parameters *p)
 481 {
 482         struct cx24113_state *state = fe->tuner_priv;
 483         /* for a ROLL-OFF factor of 0.35, 0.2: 600, 0.25: 625 */
 484         u32 roll_off = 675;
 485         u32 bw;
 486
 487         bw  = ((p->u.qpsk.symbol_rate/100) * roll_off) / 1000;
 488         bw += (10000000/100) + 5;
 489         bw /= 10;
 490         bw += 1000;
 491         cx24113_set_bandwidth(state, bw);
 492
 493         cx24113_set_frequency(state, p->frequency);
 494         msleep(5);
 495         return cx24113_get_status(fe, &bw);
 496 }
 497
 498 static s8 cx24113_agc_table[2][10] = {
 499         {-54, -41, -35, -30, -25, -21, -16, -10,  -6,  -2},
 500         {-39, -35, -30, -25, -19, -15, -11,  -5,   1,   9},
 501 };
 502
 503 void cx24113_agc_callback(struct dvb_frontend *fe)
 504 {
 505         struct cx24113_state *state = fe->tuner_priv;
 506         s16 s, i;
 507         if (!fe->ops.read_signal_strength)
 508                 return;
 509
 510         do {
 511                 /* this only works with the current CX24123 implementation */
 512                 fe->ops.read_signal_strength(fe, (u16 *) &s);
 513                 s >>= 8;
 514                 dprintk("signal strength: %d\n", s);
 515                 for (i = 0; i < sizeof(cx24113_agc_table[0]); i++)
 516                         if (cx24113_agc_table[state->gain_level][i] > s)
 517                                 break;
 518                 s = -25 - i*5;
 519         } while (cx24113_set_gain_settings(state, s));
 520 }
 521 EXPORT_SYMBOL(cx24113_agc_callback);
 522
 523 static int cx24113_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 524 {
 525         struct cx24113_state *state = fe->tuner_priv;
 526         *frequency = state->frequency;
 527         return 0;
 528 }
 529
 530 static int cx24113_release(struct dvb_frontend *fe)
 531 {
 532         struct cx24113_state *state = fe->tuner_priv;
 533         dprintk("\n");
 534         fe->tuner_priv = NULL;
 535         kfree(state);
 536         return 0;
 537 }
 538
 539 static const struct dvb_tuner_ops cx24113_tuner_ops = {
 540         .info = {
 541                 .name           = "Conexant CX24113",
 542                 .frequency_min  = 950000,
 543                 .frequency_max  = 2150000,
 544                 .frequency_step = 125,
 545         },
 546
 547         .release       = cx24113_release,
 548
 549         .init          = cx24113_init,
 550         .sleep         = NULL,
 551
 552         .set_params    = cx24113_set_params,
 553         .get_frequency = cx24113_get_frequency,
 554         .get_bandwidth = NULL,
 555         .get_status    = cx24113_get_status,
 556 };
 557
 558 struct dvb_frontend *cx24113_attach(struct dvb_frontend *fe,
 559                 const struct cx24113_config *config, struct i2c_adapter *i2c)
 560 {
 561         /* allocate memory for the internal state */
 562         struct cx24113_state *state =
 563                 kzalloc(sizeof(struct cx24113_state), GFP_KERNEL);
 564         int rc;
 565         if (state == NULL) {
 566                 err("Unable to kzalloc\n");
 567                 goto error;
 568         }
 569
 570         /* setup the state */
 571         state->config = config;
 572         state->i2c = i2c;
 573
 574         info("trying to detect myself\n");
 575
 576         /* making a dummy read, because of some expected troubles
 577          * after power on */
 578         cx24113_readreg(state, 0x00);
 579
 580         rc = cx24113_readreg(state, 0x00);
 581         if (rc < 0) {
 582                 info("CX24113 not found.\n");
 583                 goto error;
 584         }
 585         state->rev = rc;
 586
 587         switch (rc) {
 588         case 0x43:
 589                 info("detected CX24113 variant\n");
 590                 break;
 591         case REV_CX24113:
 592                 info("successfully detected\n");
 593                 break;
 594         default:
 595                 err("unsupported device id: %x\n", state->rev);
 596                 goto error;
 597         }
 598         state->ver = cx24113_readreg(state, 0x01);
 599         info("version: %x\n", state->ver);
 600
 601         /* create dvb_frontend */
 602         memcpy(&fe->ops.tuner_ops, &cx24113_tuner_ops,
 603                         sizeof(struct dvb_tuner_ops));
 604         fe->tuner_priv = state;
 605         return fe;
 606
 607 error:
 608         kfree(state);
 609
 610         return NULL;
 611 }
 612 EXPORT_SYMBOL(cx24113_attach);
 613
 614 module_param(debug, int, 0644);
 615 MODULE_PARM_DESC(debug, "Activates frontend debugging (default:0)");
 616
 617 MODULE_AUTHOR("Patrick Boettcher <pb@linuxtv.org>");
 618 MODULE_DESCRIPTION("DVB Frontend module for Conexant CX24113/CX24128hardware");
 619 MODULE_LICENSE("GPL");
 620