drivers/media/tuners/fc0012.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Fitipower FC0012 tuner driver
   4  *
   5  * Copyright (C) 2012 Hans-Frieder Vogt <hfvogt@gmx.net>
   6  */
   7
   8 #include "fc0012.h"
   9 #include "fc0012-priv.h"
  10
  11 static int fc0012_writereg(struct fc0012_priv *priv, u8 reg, u8 val)
  12 {
  13         u8 buf[2] = {reg, val};
  14         struct i2c_msg msg = {
  15                 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
  16         };
  17
  18         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  19                 dev_err(&priv->i2c->dev,
  20                         "%s: I2C write reg failed, reg: %02x, val: %02x\n",
  21                         KBUILD_MODNAME, reg, val);
  22                 return -EREMOTEIO;
  23         }
  24         return 0;
  25 }
  26
  27 static int fc0012_readreg(struct fc0012_priv *priv, u8 reg, u8 *val)
  28 {
  29         struct i2c_msg msg[2] = {
  30                 { .addr = priv->cfg->i2c_address, .flags = 0,
  31                         .buf = &reg, .len = 1 },
  32                 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
  33                         .buf = val, .len = 1 },
  34         };
  35
  36         if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  37                 dev_err(&priv->i2c->dev,
  38                         "%s: I2C read reg failed, reg: %02x\n",
  39                         KBUILD_MODNAME, reg);
  40                 return -EREMOTEIO;
  41         }
  42         return 0;
  43 }
  44
  45 static void fc0012_release(struct dvb_frontend *fe)
  46 {
  47         kfree(fe->tuner_priv);
  48         fe->tuner_priv = NULL;
  49 }
  50
  51 static int fc0012_init(struct dvb_frontend *fe)
  52 {
  53         struct fc0012_priv *priv = fe->tuner_priv;
  54         int i, ret = 0;
  55         unsigned char reg[] = {
  56                 0x00,   /* dummy reg. 0 */
  57                 0x05,   /* reg. 0x01 */
  58                 0x10,   /* reg. 0x02 */
  59                 0x00,   /* reg. 0x03 */
  60                 0x00,   /* reg. 0x04 */
  61                 0x0f,   /* reg. 0x05: may also be 0x0a */
  62                 0x00,   /* reg. 0x06: divider 2, VCO slow */
  63                 0x00,   /* reg. 0x07: may also be 0x0f */
  64                 0xff,   /* reg. 0x08: AGC Clock divide by 256, AGC gain 1/256,
  65                            Loop Bw 1/8 */
  66                 0x6e,   /* reg. 0x09: Disable LoopThrough, Enable LoopThrough: 0x6f */
  67                 0xb8,   /* reg. 0x0a: Disable LO Test Buffer */
  68                 0x82,   /* reg. 0x0b: Output Clock is same as clock frequency,
  69                            may also be 0x83 */
  70                 0xfc,   /* reg. 0x0c: depending on AGC Up-Down mode, may need 0xf8 */
  71                 0x02,   /* reg. 0x0d: AGC Not Forcing & LNA Forcing, 0x02 for DVB-T */
  72                 0x00,   /* reg. 0x0e */
  73                 0x00,   /* reg. 0x0f */
  74                 0x00,   /* reg. 0x10: may also be 0x0d */
  75                 0x00,   /* reg. 0x11 */
  76                 0x1f,   /* reg. 0x12: Set to maximum gain */
  77                 0x08,   /* reg. 0x13: Set to Middle Gain: 0x08,
  78                            Low Gain: 0x00, High Gain: 0x10, enable IX2: 0x80 */
  79                 0x00,   /* reg. 0x14 */
  80                 0x04,   /* reg. 0x15: Enable LNA COMPS */
  81         };
  82
  83         switch (priv->cfg->xtal_freq) {
  84         case FC_XTAL_27_MHZ:
  85         case FC_XTAL_28_8_MHZ:
  86                 reg[0x07] |= 0x20;
  87                 break;
  88         case FC_XTAL_36_MHZ:
  89         default:
  90                 break;
  91         }
  92
  93         if (priv->cfg->dual_master)
  94                 reg[0x0c] |= 0x02;
  95
  96         if (priv->cfg->loop_through)
  97                 reg[0x09] |= 0x01;
  98
  99         if (fe->ops.i2c_gate_ctrl)
 100                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 101
 102         for (i = 1; i < sizeof(reg); i++) {
 103                 ret = fc0012_writereg(priv, i, reg[i]);
 104                 if (ret)
 105                         break;
 106         }
 107
 108         if (fe->ops.i2c_gate_ctrl)
 109                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 110
 111         if (ret)
 112                 dev_err(&priv->i2c->dev, "%s: fc0012_writereg failed: %d\n",
 113                                 KBUILD_MODNAME, ret);
 114
 115         return ret;
 116 }
 117
 118 static int fc0012_set_params(struct dvb_frontend *fe)
 119 {
 120         struct fc0012_priv *priv = fe->tuner_priv;
 121         int i, ret = 0;
 122         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 123         u32 freq = p->frequency / 1000;
 124         u32 delsys = p->delivery_system;
 125         unsigned char reg[7], am, pm, multi, tmp;
 126         unsigned long f_vco;
 127         unsigned short xtal_freq_khz_2, xin, xdiv;
 128         bool vco_select = false;
 129
 130         if (fe->callback) {
 131                 ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
 132                         FC_FE_CALLBACK_VHF_ENABLE, (freq > 300000 ? 0 : 1));
 133                 if (ret)
 134                         goto exit;
 135         }
 136
 137         switch (priv->cfg->xtal_freq) {
 138         case FC_XTAL_27_MHZ:
 139                 xtal_freq_khz_2 = 27000 / 2;
 140                 break;
 141         case FC_XTAL_36_MHZ:
 142                 xtal_freq_khz_2 = 36000 / 2;
 143                 break;
 144         case FC_XTAL_28_8_MHZ:
 145         default:
 146                 xtal_freq_khz_2 = 28800 / 2;
 147                 break;
 148         }
 149
 150         /* select frequency divider and the frequency of VCO */
 151         if (freq < 37084) {             /* freq * 96 < 3560000 */
 152                 multi = 96;
 153                 reg[5] = 0x82;
 154                 reg[6] = 0x00;
 155         } else if (freq < 55625) {      /* freq * 64 < 3560000 */
 156                 multi = 64;
 157                 reg[5] = 0x82;
 158                 reg[6] = 0x02;
 159         } else if (freq < 74167) {      /* freq * 48 < 3560000 */
 160                 multi = 48;
 161                 reg[5] = 0x42;
 162                 reg[6] = 0x00;
 163         } else if (freq < 111250) {     /* freq * 32 < 3560000 */
 164                 multi = 32;
 165                 reg[5] = 0x42;
 166                 reg[6] = 0x02;
 167         } else if (freq < 148334) {     /* freq * 24 < 3560000 */
 168                 multi = 24;
 169                 reg[5] = 0x22;
 170                 reg[6] = 0x00;
 171         } else if (freq < 222500) {     /* freq * 16 < 3560000 */
 172                 multi = 16;
 173                 reg[5] = 0x22;
 174                 reg[6] = 0x02;
 175         } else if (freq < 296667) {     /* freq * 12 < 3560000 */
 176                 multi = 12;
 177                 reg[5] = 0x12;
 178                 reg[6] = 0x00;
 179         } else if (freq < 445000) {     /* freq * 8 < 3560000 */
 180                 multi = 8;
 181                 reg[5] = 0x12;
 182                 reg[6] = 0x02;
 183         } else if (freq < 593334) {     /* freq * 6 < 3560000 */
 184                 multi = 6;
 185                 reg[5] = 0x0a;
 186                 reg[6] = 0x00;
 187         } else {
 188                 multi = 4;
 189                 reg[5] = 0x0a;
 190                 reg[6] = 0x02;
 191         }
 192
 193         f_vco = freq * multi;
 194
 195         if (f_vco >= 3060000) {
 196                 reg[6] |= 0x08;
 197                 vco_select = true;
 198         }
 199
 200         if (freq >= 45000) {
 201                 /* From divided value (XDIV) determined the FA and FP value */
 202                 xdiv = (unsigned short)(f_vco / xtal_freq_khz_2);
 203                 if ((f_vco - xdiv * xtal_freq_khz_2) >= (xtal_freq_khz_2 / 2))
 204                         xdiv++;
 205
 206                 pm = (unsigned char)(xdiv / 8);
 207                 am = (unsigned char)(xdiv - (8 * pm));
 208
 209                 if (am < 2) {
 210                         reg[1] = am + 8;
 211                         reg[2] = pm - 1;
 212                 } else {
 213                         reg[1] = am;
 214                         reg[2] = pm;
 215                 }
 216         } else {
 217                 /* fix for frequency less than 45 MHz */
 218                 reg[1] = 0x06;
 219                 reg[2] = 0x11;
 220         }
 221
 222         /* fix clock out */
 223         reg[6] |= 0x20;
 224
 225         /* From VCO frequency determines the XIN ( fractional part of Delta
 226            Sigma PLL) and divided value (XDIV) */
 227         xin = (unsigned short)(f_vco - (f_vco / xtal_freq_khz_2) * xtal_freq_khz_2);
 228         xin = (xin << 15) / xtal_freq_khz_2;
 229         if (xin >= 16384)
 230                 xin += 32768;
 231
 232         reg[3] = xin >> 8;      /* xin with 9 bit resolution */
 233         reg[4] = xin & 0xff;
 234
 235         if (delsys == SYS_DVBT) {
 236                 reg[6] &= 0x3f; /* bits 6 and 7 describe the bandwidth */
 237                 switch (p->bandwidth_hz) {
 238                 case 6000000:
 239                         reg[6] |= 0x80;
 240                         break;
 241                 case 7000000:
 242                         reg[6] |= 0x40;
 243                         break;
 244                 case 8000000:
 245                 default:
 246                         break;
 247                 }
 248         } else {
 249                 dev_err(&priv->i2c->dev, "%s: modulation type not supported!\n",
 250                                 KBUILD_MODNAME);
 251                 return -EINVAL;
 252         }
 253
 254         /* modified for Realtek demod */
 255         reg[5] |= 0x07;
 256
 257         if (fe->ops.i2c_gate_ctrl)
 258                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 259
 260         for (i = 1; i <= 6; i++) {
 261                 ret = fc0012_writereg(priv, i, reg[i]);
 262                 if (ret)
 263                         goto exit;
 264         }
 265
 266         /* VCO Calibration */
 267         ret = fc0012_writereg(priv, 0x0e, 0x80);
 268         if (!ret)
 269                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 270
 271         /* VCO Re-Calibration if needed */
 272         if (!ret)
 273                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 274
 275         if (!ret) {
 276                 msleep(10);
 277                 ret = fc0012_readreg(priv, 0x0e, &tmp);
 278         }
 279         if (ret)
 280                 goto exit;
 281
 282         /* vco selection */
 283         tmp &= 0x3f;
 284
 285         if (vco_select) {
 286                 if (tmp > 0x3c) {
 287                         reg[6] &= ~0x08;
 288                         ret = fc0012_writereg(priv, 0x06, reg[6]);
 289                         if (!ret)
 290                                 ret = fc0012_writereg(priv, 0x0e, 0x80);
 291                         if (!ret)
 292                                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 293                 }
 294         } else {
 295                 if (tmp < 0x02) {
 296                         reg[6] |= 0x08;
 297                         ret = fc0012_writereg(priv, 0x06, reg[6]);
 298                         if (!ret)
 299                                 ret = fc0012_writereg(priv, 0x0e, 0x80);
 300                         if (!ret)
 301                                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 302                 }
 303         }
 304
 305         priv->frequency = p->frequency;
 306         priv->bandwidth = p->bandwidth_hz;
 307
 308 exit:
 309         if (fe->ops.i2c_gate_ctrl)
 310                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 311         if (ret)
 312                 dev_warn(&priv->i2c->dev, "%s: %s failed: %d\n",
 313                                 KBUILD_MODNAME, __func__, ret);
 314         return ret;
 315 }
 316
 317 static int fc0012_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 318 {
 319         struct fc0012_priv *priv = fe->tuner_priv;
 320         *frequency = priv->frequency;
 321         return 0;
 322 }
 323
 324 static int fc0012_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 325 {
 326         *frequency = 0; /* Zero-IF */
 327         return 0;
 328 }
 329
 330 static int fc0012_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 331 {
 332         struct fc0012_priv *priv = fe->tuner_priv;
 333         *bandwidth = priv->bandwidth;
 334         return 0;
 335 }
 336
 337 #define INPUT_ADC_LEVEL -8
 338
 339 static int fc0012_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 340 {
 341         struct fc0012_priv *priv = fe->tuner_priv;
 342         int ret;
 343         unsigned char tmp;
 344         int int_temp, lna_gain, int_lna, tot_agc_gain, power;
 345         static const int fc0012_lna_gain_table[] = {
 346                 /* low gain */
 347                 -63, -58, -99, -73,
 348                 -63, -65, -54, -60,
 349                 /* middle gain */
 350                  71,  70,  68,  67,
 351                  65,  63,  61,  58,
 352                 /* high gain */
 353                 197, 191, 188, 186,
 354                 184, 182, 181, 179,
 355         };
 356
 357         if (fe->ops.i2c_gate_ctrl)
 358                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 359
 360         ret = fc0012_writereg(priv, 0x12, 0x00);
 361         if (ret)
 362                 goto err;
 363
 364         ret = fc0012_readreg(priv, 0x12, &tmp);
 365         if (ret)
 366                 goto err;
 367         int_temp = tmp;
 368
 369         ret = fc0012_readreg(priv, 0x13, &tmp);
 370         if (ret)
 371                 goto err;
 372         lna_gain = tmp & 0x1f;
 373
 374         if (fe->ops.i2c_gate_ctrl)
 375                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 376
 377         if (lna_gain < ARRAY_SIZE(fc0012_lna_gain_table)) {
 378                 int_lna = fc0012_lna_gain_table[lna_gain];
 379                 tot_agc_gain = (abs((int_temp >> 5) - 7) - 2 +
 380                                 (int_temp & 0x1f)) * 2;
 381                 power = INPUT_ADC_LEVEL - tot_agc_gain - int_lna / 10;
 382
 383                 if (power >= 45)
 384                         *strength = 255;        /* 100% */
 385                 else if (power < -95)
 386                         *strength = 0;
 387                 else
 388                         *strength = (power + 95) * 255 / 140;
 389
 390                 *strength |= *strength << 8;
 391         } else {
 392                 ret = -1;
 393         }
 394
 395         goto exit;
 396
 397 err:
 398         if (fe->ops.i2c_gate_ctrl)
 399                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 400 exit:
 401         if (ret)
 402                 dev_warn(&priv->i2c->dev, "%s: %s failed: %d\n",
 403                                 KBUILD_MODNAME, __func__, ret);
 404         return ret;
 405 }
 406
 407 static const struct dvb_tuner_ops fc0012_tuner_ops = {
 408         .info = {
 409                 .name              = "Fitipower FC0012",
 410
 411                 .frequency_min_hz  =  37 * MHz, /* estimate */
 412                 .frequency_max_hz  = 862 * MHz, /* estimate */
 413         },
 414
 415         .release        = fc0012_release,
 416
 417         .init           = fc0012_init,
 418
 419         .set_params     = fc0012_set_params,
 420
 421         .get_frequency  = fc0012_get_frequency,
 422         .get_if_frequency = fc0012_get_if_frequency,
 423         .get_bandwidth  = fc0012_get_bandwidth,
 424
 425         .get_rf_strength = fc0012_get_rf_strength,
 426 };
 427
 428 struct dvb_frontend *fc0012_attach(struct dvb_frontend *fe,
 429         struct i2c_adapter *i2c, const struct fc0012_config *cfg)
 430 {
 431         struct fc0012_priv *priv;
 432         int ret;
 433         u8 chip_id;
 434
 435         if (fe->ops.i2c_gate_ctrl)
 436                 fe->ops.i2c_gate_ctrl(fe, 1);
 437
 438         priv = kzalloc(sizeof(struct fc0012_priv), GFP_KERNEL);
 439         if (!priv) {
 440                 ret = -ENOMEM;
 441                 dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
 442                 goto err;
 443         }
 444
 445         priv->cfg = cfg;
 446         priv->i2c = i2c;
 447
 448         /* check if the tuner is there */
 449         ret = fc0012_readreg(priv, 0x00, &chip_id);
 450         if (ret < 0)
 451                 goto err;
 452
 453         dev_dbg(&i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);
 454
 455         switch (chip_id) {
 456         case 0xa1:
 457                 break;
 458         default:
 459                 ret = -ENODEV;
 460                 goto err;
 461         }
 462
 463         dev_info(&i2c->dev, "%s: Fitipower FC0012 successfully identified\n",
 464                         KBUILD_MODNAME);
 465
 466         if (priv->cfg->loop_through) {
 467                 ret = fc0012_writereg(priv, 0x09, 0x6f);
 468                 if (ret < 0)
 469                         goto err;
 470         }
 471
 472         /*
 473          * TODO: Clock out en or div?
 474          * For dual tuner configuration clearing bit [0] is required.
 475          */
 476         if (priv->cfg->clock_out) {
 477                 ret =  fc0012_writereg(priv, 0x0b, 0x82);
 478                 if (ret < 0)
 479                         goto err;
 480         }
 481
 482         fe->tuner_priv = priv;
 483         memcpy(&fe->ops.tuner_ops, &fc0012_tuner_ops,
 484                 sizeof(struct dvb_tuner_ops));
 485
 486 err:
 487         if (fe->ops.i2c_gate_ctrl)
 488                 fe->ops.i2c_gate_ctrl(fe, 0);
 489
 490         if (ret) {
 491                 dev_dbg(&i2c->dev, "%s: failed: %d\n", __func__, ret);
 492                 kfree(priv);
 493                 return NULL;
 494         }
 495
 496         return fe;
 497 }
 498 EXPORT_SYMBOL(fc0012_attach);
 499
 500 MODULE_DESCRIPTION("Fitipower FC0012 silicon tuner driver");
 501 MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
 502 MODULE_LICENSE("GPL");
 503 MODULE_VERSION("0.6");