kernel/drivers/media/tuners/fc0011.c

   1 /*
   2  * Fitipower FC0011 tuner driver
   3  *
   4  * Copyright (C) 2012 Michael Buesch <m@bues.ch>
   5  *
   6  * Derived from FC0012 tuner driver:
   7  * Copyright (C) 2012 Hans-Frieder Vogt <hfvogt@gmx.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  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 "fc0011.h"
  25
  26
  27 /* Tuner registers */
  28 enum {
  29         FC11_REG_0,
  30         FC11_REG_FA,            /* FA */
  31         FC11_REG_FP,            /* FP */
  32         FC11_REG_XINHI,         /* XIN high 8 bit */
  33         FC11_REG_XINLO,         /* XIN low 8 bit */
  34         FC11_REG_VCO,           /* VCO */
  35         FC11_REG_VCOSEL,        /* VCO select */
  36         FC11_REG_7,             /* Unknown tuner reg 7 */
  37         FC11_REG_8,             /* Unknown tuner reg 8 */
  38         FC11_REG_9,
  39         FC11_REG_10,            /* Unknown tuner reg 10 */
  40         FC11_REG_11,            /* Unknown tuner reg 11 */
  41         FC11_REG_12,
  42         FC11_REG_RCCAL,         /* RC calibrate */
  43         FC11_REG_VCOCAL,        /* VCO calibrate */
  44         FC11_REG_15,
  45         FC11_REG_16,            /* Unknown tuner reg 16 */
  46         FC11_REG_17,
  47
  48         FC11_NR_REGS,           /* Number of registers */
  49 };
  50
  51 enum FC11_REG_VCOSEL_bits {
  52         FC11_VCOSEL_2           = 0x08, /* VCO select 2 */
  53         FC11_VCOSEL_1           = 0x10, /* VCO select 1 */
  54         FC11_VCOSEL_CLKOUT      = 0x20, /* Fix clock out */
  55         FC11_VCOSEL_BW7M        = 0x40, /* 7MHz bw */
  56         FC11_VCOSEL_BW6M        = 0x80, /* 6MHz bw */
  57 };
  58
  59 enum FC11_REG_RCCAL_bits {
  60         FC11_RCCAL_FORCE        = 0x10, /* force */
  61 };
  62
  63 enum FC11_REG_VCOCAL_bits {
  64         FC11_VCOCAL_RUN         = 0,    /* VCO calibration run */
  65         FC11_VCOCAL_VALUEMASK   = 0x3F, /* VCO calibration value mask */
  66         FC11_VCOCAL_OK          = 0x40, /* VCO calibration Ok */
  67         FC11_VCOCAL_RESET       = 0x80, /* VCO calibration reset */
  68 };
  69
  70
  71 struct fc0011_priv {
  72         struct i2c_adapter *i2c;
  73         u8 addr;
  74
  75         u32 frequency;
  76         u32 bandwidth;
  77 };
  78
  79
  80 static int fc0011_writereg(struct fc0011_priv *priv, u8 reg, u8 val)
  81 {
  82         u8 buf[2] = { reg, val };
  83         struct i2c_msg msg = { .addr = priv->addr,
  84                 .flags = 0, .buf = buf, .len = 2 };
  85
  86         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  87                 dev_err(&priv->i2c->dev,
  88                         "I2C write reg failed, reg: %02x, val: %02x\n",
  89                         reg, val);
  90                 return -EIO;
  91         }
  92
  93         return 0;
  94 }
  95
  96 static int fc0011_readreg(struct fc0011_priv *priv, u8 reg, u8 *val)
  97 {
  98         u8 dummy;
  99         struct i2c_msg msg[2] = {
 100                 { .addr = priv->addr,
 101                   .flags = 0, .buf = &reg, .len = 1 },
 102                 { .addr = priv->addr,
 103                   .flags = I2C_M_RD, .buf = val ? : &dummy, .len = 1 },
 104         };
 105
 106         if (i2c_transfer(priv->i2c, msg, 2) != 2) {
 107                 dev_err(&priv->i2c->dev,
 108                         "I2C read failed, reg: %02x\n", reg);
 109                 return -EIO;
 110         }
 111
 112         return 0;
 113 }
 114
 115 static int fc0011_release(struct dvb_frontend *fe)
 116 {
 117         kfree(fe->tuner_priv);
 118         fe->tuner_priv = NULL;
 119
 120         return 0;
 121 }
 122
 123 static int fc0011_init(struct dvb_frontend *fe)
 124 {
 125         struct fc0011_priv *priv = fe->tuner_priv;
 126         int err;
 127
 128         if (WARN_ON(!fe->callback))
 129                 return -EINVAL;
 130
 131         err = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
 132                            FC0011_FE_CALLBACK_POWER, priv->addr);
 133         if (err) {
 134                 dev_err(&priv->i2c->dev, "Power-on callback failed\n");
 135                 return err;
 136         }
 137         err = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
 138                            FC0011_FE_CALLBACK_RESET, priv->addr);
 139         if (err) {
 140                 dev_err(&priv->i2c->dev, "Reset callback failed\n");
 141                 return err;
 142         }
 143
 144         return 0;
 145 }
 146
 147 /* Initiate VCO calibration */
 148 static int fc0011_vcocal_trigger(struct fc0011_priv *priv)
 149 {
 150         int err;
 151
 152         err = fc0011_writereg(priv, FC11_REG_VCOCAL, FC11_VCOCAL_RESET);
 153         if (err)
 154                 return err;
 155         err = fc0011_writereg(priv, FC11_REG_VCOCAL, FC11_VCOCAL_RUN);
 156         if (err)
 157                 return err;
 158
 159         return 0;
 160 }
 161
 162 /* Read VCO calibration value */
 163 static int fc0011_vcocal_read(struct fc0011_priv *priv, u8 *value)
 164 {
 165         int err;
 166
 167         err = fc0011_writereg(priv, FC11_REG_VCOCAL, FC11_VCOCAL_RUN);
 168         if (err)
 169                 return err;
 170         usleep_range(10000, 20000);
 171         err = fc0011_readreg(priv, FC11_REG_VCOCAL, value);
 172         if (err)
 173                 return err;
 174
 175         return 0;
 176 }
 177
 178 static int fc0011_set_params(struct dvb_frontend *fe)
 179 {
 180         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 181         struct fc0011_priv *priv = fe->tuner_priv;
 182         int err;
 183         unsigned int i, vco_retries;
 184         u32 freq = p->frequency / 1000;
 185         u32 bandwidth = p->bandwidth_hz / 1000;
 186         u32 fvco, xin, frac, xdiv, xdivr;
 187         u8 fa, fp, vco_sel, vco_cal;
 188         u8 regs[FC11_NR_REGS] = { };
 189
 190         regs[FC11_REG_7] = 0x0F;
 191         regs[FC11_REG_8] = 0x3E;
 192         regs[FC11_REG_10] = 0xB8;
 193         regs[FC11_REG_11] = 0x80;
 194         regs[FC11_REG_RCCAL] = 0x04;
 195         err = fc0011_writereg(priv, FC11_REG_7, regs[FC11_REG_7]);
 196         err |= fc0011_writereg(priv, FC11_REG_8, regs[FC11_REG_8]);
 197         err |= fc0011_writereg(priv, FC11_REG_10, regs[FC11_REG_10]);
 198         err |= fc0011_writereg(priv, FC11_REG_11, regs[FC11_REG_11]);
 199         err |= fc0011_writereg(priv, FC11_REG_RCCAL, regs[FC11_REG_RCCAL]);
 200         if (err)
 201                 return -EIO;
 202
 203         /* Set VCO freq and VCO div */
 204         if (freq < 54000) {
 205                 fvco = freq * 64;
 206                 regs[FC11_REG_VCO] = 0x82;
 207         } else if (freq < 108000) {
 208                 fvco = freq * 32;
 209                 regs[FC11_REG_VCO] = 0x42;
 210         } else if (freq < 216000) {
 211                 fvco = freq * 16;
 212                 regs[FC11_REG_VCO] = 0x22;
 213         } else if (freq < 432000) {
 214                 fvco = freq * 8;
 215                 regs[FC11_REG_VCO] = 0x12;
 216         } else {
 217                 fvco = freq * 4;
 218                 regs[FC11_REG_VCO] = 0x0A;
 219         }
 220
 221         /* Calc XIN. The PLL reference frequency is 18 MHz. */
 222         xdiv = fvco / 18000;
 223         WARN_ON(xdiv > 0xFF);
 224         frac = fvco - xdiv * 18000;
 225         frac = (frac << 15) / 18000;
 226         if (frac >= 16384)
 227                 frac += 32786;
 228         if (!frac)
 229                 xin = 0;
 230         else
 231                 xin = clamp_t(u32, frac, 512, 65024);
 232         regs[FC11_REG_XINHI] = xin >> 8;
 233         regs[FC11_REG_XINLO] = xin;
 234
 235         /* Calc FP and FA */
 236         xdivr = xdiv;
 237         if (fvco - xdiv * 18000 >= 9000)
 238                 xdivr += 1; /* round */
 239         fp = xdivr / 8;
 240         fa = xdivr - fp * 8;
 241         if (fa < 2) {
 242                 fp -= 1;
 243                 fa += 8;
 244         }
 245         if (fp > 0x1F) {
 246                 fp = 0x1F;
 247                 fa = 0xF;
 248         }
 249         if (fa >= fp) {
 250                 dev_warn(&priv->i2c->dev,
 251                          "fa %02X >= fp %02X, but trying to continue\n",
 252                          (unsigned int)(u8)fa, (unsigned int)(u8)fp);
 253         }
 254         regs[FC11_REG_FA] = fa;
 255         regs[FC11_REG_FP] = fp;
 256
 257         /* Select bandwidth */
 258         switch (bandwidth) {
 259         case 8000:
 260                 break;
 261         case 7000:
 262                 regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_BW7M;
 263                 break;
 264         default:
 265                 dev_warn(&priv->i2c->dev, "Unsupported bandwidth %u kHz. "
 266                          "Using 6000 kHz.\n",
 267                          bandwidth);
 268                 bandwidth = 6000;
 269                 /* fallthrough */
 270         case 6000:
 271                 regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_BW6M;
 272                 break;
 273         }
 274
 275         /* Pre VCO select */
 276         if (fvco < 2320000) {
 277                 vco_sel = 0;
 278                 regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 279         } else if (fvco < 3080000) {
 280                 vco_sel = 1;
 281                 regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 282                 regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_1;
 283         } else {
 284                 vco_sel = 2;
 285                 regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 286                 regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_2;
 287         }
 288
 289         /* Fix for low freqs */
 290         if (freq < 45000) {
 291                 regs[FC11_REG_FA] = 0x6;
 292                 regs[FC11_REG_FP] = 0x11;
 293         }
 294
 295         /* Clock out fix */
 296         regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_CLKOUT;
 297
 298         /* Write the cached registers */
 299         for (i = FC11_REG_FA; i <= FC11_REG_VCOSEL; i++) {
 300                 err = fc0011_writereg(priv, i, regs[i]);
 301                 if (err)
 302                         return err;
 303         }
 304
 305         /* VCO calibration */
 306         err = fc0011_vcocal_trigger(priv);
 307         if (err)
 308                 return err;
 309         err = fc0011_vcocal_read(priv, &vco_cal);
 310         if (err)
 311                 return err;
 312         vco_retries = 0;
 313         while (!(vco_cal & FC11_VCOCAL_OK) && vco_retries < 3) {
 314                 /* Reset the tuner and try again */
 315                 err = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
 316                                    FC0011_FE_CALLBACK_RESET, priv->addr);
 317                 if (err) {
 318                         dev_err(&priv->i2c->dev, "Failed to reset tuner\n");
 319                         return err;
 320                 }
 321                 /* Reinit tuner config */
 322                 err = 0;
 323                 for (i = FC11_REG_FA; i <= FC11_REG_VCOSEL; i++)
 324                         err |= fc0011_writereg(priv, i, regs[i]);
 325                 err |= fc0011_writereg(priv, FC11_REG_7, regs[FC11_REG_7]);
 326                 err |= fc0011_writereg(priv, FC11_REG_8, regs[FC11_REG_8]);
 327                 err |= fc0011_writereg(priv, FC11_REG_10, regs[FC11_REG_10]);
 328                 err |= fc0011_writereg(priv, FC11_REG_11, regs[FC11_REG_11]);
 329                 err |= fc0011_writereg(priv, FC11_REG_RCCAL, regs[FC11_REG_RCCAL]);
 330                 if (err)
 331                         return -EIO;
 332                 /* VCO calibration */
 333                 err = fc0011_vcocal_trigger(priv);
 334                 if (err)
 335                         return err;
 336                 err = fc0011_vcocal_read(priv, &vco_cal);
 337                 if (err)
 338                         return err;
 339                 vco_retries++;
 340         }
 341         if (!(vco_cal & FC11_VCOCAL_OK)) {
 342                 dev_err(&priv->i2c->dev,
 343                         "Failed to read VCO calibration value (got %02X)\n",
 344                         (unsigned int)vco_cal);
 345                 return -EIO;
 346         }
 347         vco_cal &= FC11_VCOCAL_VALUEMASK;
 348
 349         switch (vco_sel) {
 350         default:
 351                 WARN_ON(1);
 352         case 0:
 353                 if (vco_cal < 8) {
 354                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 355                         regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_1;
 356                         err = fc0011_writereg(priv, FC11_REG_VCOSEL,
 357                                               regs[FC11_REG_VCOSEL]);
 358                         if (err)
 359                                 return err;
 360                         err = fc0011_vcocal_trigger(priv);
 361                         if (err)
 362                                 return err;
 363                 } else {
 364                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 365                         err = fc0011_writereg(priv, FC11_REG_VCOSEL,
 366                                               regs[FC11_REG_VCOSEL]);
 367                         if (err)
 368                                 return err;
 369                 }
 370                 break;
 371         case 1:
 372                 if (vco_cal < 5) {
 373                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 374                         regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_2;
 375                         err = fc0011_writereg(priv, FC11_REG_VCOSEL,
 376                                               regs[FC11_REG_VCOSEL]);
 377                         if (err)
 378                                 return err;
 379                         err = fc0011_vcocal_trigger(priv);
 380                         if (err)
 381                                 return err;
 382                 } else if (vco_cal <= 48) {
 383                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 384                         regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_1;
 385                         err = fc0011_writereg(priv, FC11_REG_VCOSEL,
 386                                               regs[FC11_REG_VCOSEL]);
 387                         if (err)
 388                                 return err;
 389                 } else {
 390                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 391                         err = fc0011_writereg(priv, FC11_REG_VCOSEL,
 392                                               regs[FC11_REG_VCOSEL]);
 393                         if (err)
 394                                 return err;
 395                         err = fc0011_vcocal_trigger(priv);
 396                         if (err)
 397                                 return err;
 398                 }
 399                 break;
 400         case 2:
 401                 if (vco_cal > 53) {
 402                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 403                         regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_1;
 404                         err = fc0011_writereg(priv, FC11_REG_VCOSEL,
 405                                               regs[FC11_REG_VCOSEL]);
 406                         if (err)
 407                                 return err;
 408                         err = fc0011_vcocal_trigger(priv);
 409                         if (err)
 410                                 return err;
 411                 } else {
 412                         regs[FC11_REG_VCOSEL] &= ~(FC11_VCOSEL_1 | FC11_VCOSEL_2);
 413                         regs[FC11_REG_VCOSEL] |= FC11_VCOSEL_2;
 414                         err = fc0011_writereg(priv, FC11_REG_VCOSEL,
 415                                               regs[FC11_REG_VCOSEL]);
 416                         if (err)
 417                                 return err;
 418                 }
 419                 break;
 420         }
 421         err = fc0011_vcocal_read(priv, NULL);
 422         if (err)
 423                 return err;
 424         usleep_range(10000, 50000);
 425
 426         err = fc0011_readreg(priv, FC11_REG_RCCAL, &regs[FC11_REG_RCCAL]);
 427         if (err)
 428                 return err;
 429         regs[FC11_REG_RCCAL] |= FC11_RCCAL_FORCE;
 430         err = fc0011_writereg(priv, FC11_REG_RCCAL, regs[FC11_REG_RCCAL]);
 431         if (err)
 432                 return err;
 433         regs[FC11_REG_16] = 0xB;
 434         err = fc0011_writereg(priv, FC11_REG_16, regs[FC11_REG_16]);
 435         if (err)
 436                 return err;
 437
 438         dev_dbg(&priv->i2c->dev, "Tuned to "
 439                 "fa=%02X fp=%02X xin=%02X%02X vco=%02X vcosel=%02X "
 440                 "vcocal=%02X(%u) bw=%u\n",
 441                 (unsigned int)regs[FC11_REG_FA],
 442                 (unsigned int)regs[FC11_REG_FP],
 443                 (unsigned int)regs[FC11_REG_XINHI],
 444                 (unsigned int)regs[FC11_REG_XINLO],
 445                 (unsigned int)regs[FC11_REG_VCO],
 446                 (unsigned int)regs[FC11_REG_VCOSEL],
 447                 (unsigned int)vco_cal, vco_retries,
 448                 (unsigned int)bandwidth);
 449
 450         priv->frequency = p->frequency;
 451         priv->bandwidth = p->bandwidth_hz;
 452
 453         return 0;
 454 }
 455
 456 static int fc0011_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 457 {
 458         struct fc0011_priv *priv = fe->tuner_priv;
 459
 460         *frequency = priv->frequency;
 461
 462         return 0;
 463 }
 464
 465 static int fc0011_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 466 {
 467         *frequency = 0;
 468
 469         return 0;
 470 }
 471
 472 static int fc0011_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 473 {
 474         struct fc0011_priv *priv = fe->tuner_priv;
 475
 476         *bandwidth = priv->bandwidth;
 477
 478         return 0;
 479 }
 480
 481 static const struct dvb_tuner_ops fc0011_tuner_ops = {
 482         .info = {
 483                 .name           = "Fitipower FC0011",
 484
 485                 .frequency_min  = 45000000,
 486                 .frequency_max  = 1000000000,
 487         },
 488
 489         .release                = fc0011_release,
 490         .init                   = fc0011_init,
 491
 492         .set_params             = fc0011_set_params,
 493
 494         .get_frequency          = fc0011_get_frequency,
 495         .get_if_frequency       = fc0011_get_if_frequency,
 496         .get_bandwidth          = fc0011_get_bandwidth,
 497 };
 498
 499 struct dvb_frontend *fc0011_attach(struct dvb_frontend *fe,
 500                                    struct i2c_adapter *i2c,
 501                                    const struct fc0011_config *config)
 502 {
 503         struct fc0011_priv *priv;
 504
 505         priv = kzalloc(sizeof(struct fc0011_priv), GFP_KERNEL);
 506         if (!priv)
 507                 return NULL;
 508
 509         priv->i2c = i2c;
 510         priv->addr = config->i2c_address;
 511
 512         fe->tuner_priv = priv;
 513         fe->ops.tuner_ops = fc0011_tuner_ops;
 514
 515         dev_info(&priv->i2c->dev, "Fitipower FC0011 tuner attached\n");
 516
 517         return fe;
 518 }
 519 EXPORT_SYMBOL(fc0011_attach);
 520
 521 MODULE_DESCRIPTION("Fitipower FC0011 silicon tuner driver");
 522 MODULE_AUTHOR("Michael Buesch <m@bues.ch>");
 523 MODULE_LICENSE("GPL");