kernel/drivers/media/tuners/fc0012.c

   1 /*
   2  * Fitipower FC0012 tuner driver
   3  *
   4  * Copyright (C) 2012 Hans-Frieder Vogt <hfvogt@gmx.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "fc0012.h"
  22 #include "fc0012-priv.h"
  23
  24 static int fc0012_writereg(struct fc0012_priv *priv, u8 reg, u8 val)
  25 {
  26         u8 buf[2] = {reg, val};
  27         struct i2c_msg msg = {
  28                 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
  29         };
  30
  31         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  32                 dev_err(&priv->i2c->dev,
  33                         "%s: I2C write reg failed, reg: %02x, val: %02x\n",
  34                         KBUILD_MODNAME, reg, val);
  35                 return -EREMOTEIO;
  36         }
  37         return 0;
  38 }
  39
  40 static int fc0012_readreg(struct fc0012_priv *priv, u8 reg, u8 *val)
  41 {
  42         struct i2c_msg msg[2] = {
  43                 { .addr = priv->cfg->i2c_address, .flags = 0,
  44                         .buf = &reg, .len = 1 },
  45                 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
  46                         .buf = val, .len = 1 },
  47         };
  48
  49         if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  50                 dev_err(&priv->i2c->dev,
  51                         "%s: I2C read reg failed, reg: %02x\n",
  52                         KBUILD_MODNAME, reg);
  53                 return -EREMOTEIO;
  54         }
  55         return 0;
  56 }
  57
  58 static int fc0012_release(struct dvb_frontend *fe)
  59 {
  60         kfree(fe->tuner_priv);
  61         fe->tuner_priv = NULL;
  62         return 0;
  63 }
  64
  65 static int fc0012_init(struct dvb_frontend *fe)
  66 {
  67         struct fc0012_priv *priv = fe->tuner_priv;
  68         int i, ret = 0;
  69         unsigned char reg[] = {
  70                 0x00,   /* dummy reg. 0 */
  71                 0x05,   /* reg. 0x01 */
  72                 0x10,   /* reg. 0x02 */
  73                 0x00,   /* reg. 0x03 */
  74                 0x00,   /* reg. 0x04 */
  75                 0x0f,   /* reg. 0x05: may also be 0x0a */
  76                 0x00,   /* reg. 0x06: divider 2, VCO slow */
  77                 0x00,   /* reg. 0x07: may also be 0x0f */
  78                 0xff,   /* reg. 0x08: AGC Clock divide by 256, AGC gain 1/256,
  79                            Loop Bw 1/8 */
  80                 0x6e,   /* reg. 0x09: Disable LoopThrough, Enable LoopThrough: 0x6f */
  81                 0xb8,   /* reg. 0x0a: Disable LO Test Buffer */
  82                 0x82,   /* reg. 0x0b: Output Clock is same as clock frequency,
  83                            may also be 0x83 */
  84                 0xfc,   /* reg. 0x0c: depending on AGC Up-Down mode, may need 0xf8 */
  85                 0x02,   /* reg. 0x0d: AGC Not Forcing & LNA Forcing, 0x02 for DVB-T */
  86                 0x00,   /* reg. 0x0e */
  87                 0x00,   /* reg. 0x0f */
  88                 0x00,   /* reg. 0x10: may also be 0x0d */
  89                 0x00,   /* reg. 0x11 */
  90                 0x1f,   /* reg. 0x12: Set to maximum gain */
  91                 0x08,   /* reg. 0x13: Set to Middle Gain: 0x08,
  92                            Low Gain: 0x00, High Gain: 0x10, enable IX2: 0x80 */
  93                 0x00,   /* reg. 0x14 */
  94                 0x04,   /* reg. 0x15: Enable LNA COMPS */
  95         };
  96
  97         switch (priv->cfg->xtal_freq) {
  98         case FC_XTAL_27_MHZ:
  99         case FC_XTAL_28_8_MHZ:
 100                 reg[0x07] |= 0x20;
 101                 break;
 102         case FC_XTAL_36_MHZ:
 103         default:
 104                 break;
 105         }
 106
 107         if (priv->cfg->dual_master)
 108                 reg[0x0c] |= 0x02;
 109
 110         if (priv->cfg->loop_through)
 111                 reg[0x09] |= 0x01;
 112
 113         if (fe->ops.i2c_gate_ctrl)
 114                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 115
 116         for (i = 1; i < sizeof(reg); i++) {
 117                 ret = fc0012_writereg(priv, i, reg[i]);
 118                 if (ret)
 119                         break;
 120         }
 121
 122         if (fe->ops.i2c_gate_ctrl)
 123                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 124
 125         if (ret)
 126                 dev_err(&priv->i2c->dev, "%s: fc0012_writereg failed: %d\n",
 127                                 KBUILD_MODNAME, ret);
 128
 129         return ret;
 130 }
 131
 132 static int fc0012_set_params(struct dvb_frontend *fe)
 133 {
 134         struct fc0012_priv *priv = fe->tuner_priv;
 135         int i, ret = 0;
 136         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 137         u32 freq = p->frequency / 1000;
 138         u32 delsys = p->delivery_system;
 139         unsigned char reg[7], am, pm, multi, tmp;
 140         unsigned long f_vco;
 141         unsigned short xtal_freq_khz_2, xin, xdiv;
 142         bool vco_select = false;
 143
 144         if (fe->callback) {
 145                 ret = fe->callback(priv->i2c, DVB_FRONTEND_COMPONENT_TUNER,
 146                         FC_FE_CALLBACK_VHF_ENABLE, (freq > 300000 ? 0 : 1));
 147                 if (ret)
 148                         goto exit;
 149         }
 150
 151         switch (priv->cfg->xtal_freq) {
 152         case FC_XTAL_27_MHZ:
 153                 xtal_freq_khz_2 = 27000 / 2;
 154                 break;
 155         case FC_XTAL_36_MHZ:
 156                 xtal_freq_khz_2 = 36000 / 2;
 157                 break;
 158         case FC_XTAL_28_8_MHZ:
 159         default:
 160                 xtal_freq_khz_2 = 28800 / 2;
 161                 break;
 162         }
 163
 164         /* select frequency divider and the frequency of VCO */
 165         if (freq < 37084) {             /* freq * 96 < 3560000 */
 166                 multi = 96;
 167                 reg[5] = 0x82;
 168                 reg[6] = 0x00;
 169         } else if (freq < 55625) {      /* freq * 64 < 3560000 */
 170                 multi = 64;
 171                 reg[5] = 0x82;
 172                 reg[6] = 0x02;
 173         } else if (freq < 74167) {      /* freq * 48 < 3560000 */
 174                 multi = 48;
 175                 reg[5] = 0x42;
 176                 reg[6] = 0x00;
 177         } else if (freq < 111250) {     /* freq * 32 < 3560000 */
 178                 multi = 32;
 179                 reg[5] = 0x42;
 180                 reg[6] = 0x02;
 181         } else if (freq < 148334) {     /* freq * 24 < 3560000 */
 182                 multi = 24;
 183                 reg[5] = 0x22;
 184                 reg[6] = 0x00;
 185         } else if (freq < 222500) {     /* freq * 16 < 3560000 */
 186                 multi = 16;
 187                 reg[5] = 0x22;
 188                 reg[6] = 0x02;
 189         } else if (freq < 296667) {     /* freq * 12 < 3560000 */
 190                 multi = 12;
 191                 reg[5] = 0x12;
 192                 reg[6] = 0x00;
 193         } else if (freq < 445000) {     /* freq * 8 < 3560000 */
 194                 multi = 8;
 195                 reg[5] = 0x12;
 196                 reg[6] = 0x02;
 197         } else if (freq < 593334) {     /* freq * 6 < 3560000 */
 198                 multi = 6;
 199                 reg[5] = 0x0a;
 200                 reg[6] = 0x00;
 201         } else {
 202                 multi = 4;
 203                 reg[5] = 0x0a;
 204                 reg[6] = 0x02;
 205         }
 206
 207         f_vco = freq * multi;
 208
 209         if (f_vco >= 3060000) {
 210                 reg[6] |= 0x08;
 211                 vco_select = true;
 212         }
 213
 214         if (freq >= 45000) {
 215                 /* From divided value (XDIV) determined the FA and FP value */
 216                 xdiv = (unsigned short)(f_vco / xtal_freq_khz_2);
 217                 if ((f_vco - xdiv * xtal_freq_khz_2) >= (xtal_freq_khz_2 / 2))
 218                         xdiv++;
 219
 220                 pm = (unsigned char)(xdiv / 8);
 221                 am = (unsigned char)(xdiv - (8 * pm));
 222
 223                 if (am < 2) {
 224                         reg[1] = am + 8;
 225                         reg[2] = pm - 1;
 226                 } else {
 227                         reg[1] = am;
 228                         reg[2] = pm;
 229                 }
 230         } else {
 231                 /* fix for frequency less than 45 MHz */
 232                 reg[1] = 0x06;
 233                 reg[2] = 0x11;
 234         }
 235
 236         /* fix clock out */
 237         reg[6] |= 0x20;
 238
 239         /* From VCO frequency determines the XIN ( fractional part of Delta
 240            Sigma PLL) and divided value (XDIV) */
 241         xin = (unsigned short)(f_vco - (f_vco / xtal_freq_khz_2) * xtal_freq_khz_2);
 242         xin = (xin << 15) / xtal_freq_khz_2;
 243         if (xin >= 16384)
 244                 xin += 32768;
 245
 246         reg[3] = xin >> 8;      /* xin with 9 bit resolution */
 247         reg[4] = xin & 0xff;
 248
 249         if (delsys == SYS_DVBT) {
 250                 reg[6] &= 0x3f; /* bits 6 and 7 describe the bandwidth */
 251                 switch (p->bandwidth_hz) {
 252                 case 6000000:
 253                         reg[6] |= 0x80;
 254                         break;
 255                 case 7000000:
 256                         reg[6] |= 0x40;
 257                         break;
 258                 case 8000000:
 259                 default:
 260                         break;
 261                 }
 262         } else {
 263                 dev_err(&priv->i2c->dev, "%s: modulation type not supported!\n",
 264                                 KBUILD_MODNAME);
 265                 return -EINVAL;
 266         }
 267
 268         /* modified for Realtek demod */
 269         reg[5] |= 0x07;
 270
 271         if (fe->ops.i2c_gate_ctrl)
 272                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 273
 274         for (i = 1; i <= 6; i++) {
 275                 ret = fc0012_writereg(priv, i, reg[i]);
 276                 if (ret)
 277                         goto exit;
 278         }
 279
 280         /* VCO Calibration */
 281         ret = fc0012_writereg(priv, 0x0e, 0x80);
 282         if (!ret)
 283                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 284
 285         /* VCO Re-Calibration if needed */
 286         if (!ret)
 287                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 288
 289         if (!ret) {
 290                 msleep(10);
 291                 ret = fc0012_readreg(priv, 0x0e, &tmp);
 292         }
 293         if (ret)
 294                 goto exit;
 295
 296         /* vco selection */
 297         tmp &= 0x3f;
 298
 299         if (vco_select) {
 300                 if (tmp > 0x3c) {
 301                         reg[6] &= ~0x08;
 302                         ret = fc0012_writereg(priv, 0x06, reg[6]);
 303                         if (!ret)
 304                                 ret = fc0012_writereg(priv, 0x0e, 0x80);
 305                         if (!ret)
 306                                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 307                 }
 308         } else {
 309                 if (tmp < 0x02) {
 310                         reg[6] |= 0x08;
 311                         ret = fc0012_writereg(priv, 0x06, reg[6]);
 312                         if (!ret)
 313                                 ret = fc0012_writereg(priv, 0x0e, 0x80);
 314                         if (!ret)
 315                                 ret = fc0012_writereg(priv, 0x0e, 0x00);
 316                 }
 317         }
 318
 319         priv->frequency = p->frequency;
 320         priv->bandwidth = p->bandwidth_hz;
 321
 322 exit:
 323         if (fe->ops.i2c_gate_ctrl)
 324                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 325         if (ret)
 326                 dev_warn(&priv->i2c->dev, "%s: %s failed: %d\n",
 327                                 KBUILD_MODNAME, __func__, ret);
 328         return ret;
 329 }
 330
 331 static int fc0012_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 332 {
 333         struct fc0012_priv *priv = fe->tuner_priv;
 334         *frequency = priv->frequency;
 335         return 0;
 336 }
 337
 338 static int fc0012_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 339 {
 340         *frequency = 0; /* Zero-IF */
 341         return 0;
 342 }
 343
 344 static int fc0012_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 345 {
 346         struct fc0012_priv *priv = fe->tuner_priv;
 347         *bandwidth = priv->bandwidth;
 348         return 0;
 349 }
 350
 351 #define INPUT_ADC_LEVEL -8
 352
 353 static int fc0012_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 354 {
 355         struct fc0012_priv *priv = fe->tuner_priv;
 356         int ret;
 357         unsigned char tmp;
 358         int int_temp, lna_gain, int_lna, tot_agc_gain, power;
 359         const int fc0012_lna_gain_table[] = {
 360                 /* low gain */
 361                 -63, -58, -99, -73,
 362                 -63, -65, -54, -60,
 363                 /* middle gain */
 364                  71,  70,  68,  67,
 365                  65,  63,  61,  58,
 366                 /* high gain */
 367                 197, 191, 188, 186,
 368                 184, 182, 181, 179,
 369         };
 370
 371         if (fe->ops.i2c_gate_ctrl)
 372                 fe->ops.i2c_gate_ctrl(fe, 1); /* open I2C-gate */
 373
 374         ret = fc0012_writereg(priv, 0x12, 0x00);
 375         if (ret)
 376                 goto err;
 377
 378         ret = fc0012_readreg(priv, 0x12, &tmp);
 379         if (ret)
 380                 goto err;
 381         int_temp = tmp;
 382
 383         ret = fc0012_readreg(priv, 0x13, &tmp);
 384         if (ret)
 385                 goto err;
 386         lna_gain = tmp & 0x1f;
 387
 388         if (fe->ops.i2c_gate_ctrl)
 389                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 390
 391         if (lna_gain < ARRAY_SIZE(fc0012_lna_gain_table)) {
 392                 int_lna = fc0012_lna_gain_table[lna_gain];
 393                 tot_agc_gain = (abs((int_temp >> 5) - 7) - 2 +
 394                                 (int_temp & 0x1f)) * 2;
 395                 power = INPUT_ADC_LEVEL - tot_agc_gain - int_lna / 10;
 396
 397                 if (power >= 45)
 398                         *strength = 255;        /* 100% */
 399                 else if (power < -95)
 400                         *strength = 0;
 401                 else
 402                         *strength = (power + 95) * 255 / 140;
 403
 404                 *strength |= *strength << 8;
 405         } else {
 406                 ret = -1;
 407         }
 408
 409         goto exit;
 410
 411 err:
 412         if (fe->ops.i2c_gate_ctrl)
 413                 fe->ops.i2c_gate_ctrl(fe, 0); /* close I2C-gate */
 414 exit:
 415         if (ret)
 416                 dev_warn(&priv->i2c->dev, "%s: %s failed: %d\n",
 417                                 KBUILD_MODNAME, __func__, ret);
 418         return ret;
 419 }
 420
 421 static const struct dvb_tuner_ops fc0012_tuner_ops = {
 422         .info = {
 423                 .name           = "Fitipower FC0012",
 424
 425                 .frequency_min  = 37000000,     /* estimate */
 426                 .frequency_max  = 862000000,    /* estimate */
 427                 .frequency_step = 0,
 428         },
 429
 430         .release        = fc0012_release,
 431
 432         .init           = fc0012_init,
 433
 434         .set_params     = fc0012_set_params,
 435
 436         .get_frequency  = fc0012_get_frequency,
 437         .get_if_frequency = fc0012_get_if_frequency,
 438         .get_bandwidth  = fc0012_get_bandwidth,
 439
 440         .get_rf_strength = fc0012_get_rf_strength,
 441 };
 442
 443 struct dvb_frontend *fc0012_attach(struct dvb_frontend *fe,
 444         struct i2c_adapter *i2c, const struct fc0012_config *cfg)
 445 {
 446         struct fc0012_priv *priv;
 447         int ret;
 448         u8 chip_id;
 449
 450         if (fe->ops.i2c_gate_ctrl)
 451                 fe->ops.i2c_gate_ctrl(fe, 1);
 452
 453         priv = kzalloc(sizeof(struct fc0012_priv), GFP_KERNEL);
 454         if (!priv) {
 455                 ret = -ENOMEM;
 456                 dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
 457                 goto err;
 458         }
 459
 460         priv->cfg = cfg;
 461         priv->i2c = i2c;
 462
 463         /* check if the tuner is there */
 464         ret = fc0012_readreg(priv, 0x00, &chip_id);
 465         if (ret < 0)
 466                 goto err;
 467
 468         dev_dbg(&i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);
 469
 470         switch (chip_id) {
 471         case 0xa1:
 472                 break;
 473         default:
 474                 ret = -ENODEV;
 475                 goto err;
 476         }
 477
 478         dev_info(&i2c->dev, "%s: Fitipower FC0012 successfully identified\n",
 479                         KBUILD_MODNAME);
 480
 481         if (priv->cfg->loop_through) {
 482                 ret = fc0012_writereg(priv, 0x09, 0x6f);
 483                 if (ret < 0)
 484                         goto err;
 485         }
 486
 487         /*
 488          * TODO: Clock out en or div?
 489          * For dual tuner configuration clearing bit [0] is required.
 490          */
 491         if (priv->cfg->clock_out) {
 492                 ret =  fc0012_writereg(priv, 0x0b, 0x82);
 493                 if (ret < 0)
 494                         goto err;
 495         }
 496
 497         fe->tuner_priv = priv;
 498         memcpy(&fe->ops.tuner_ops, &fc0012_tuner_ops,
 499                 sizeof(struct dvb_tuner_ops));
 500
 501 err:
 502         if (fe->ops.i2c_gate_ctrl)
 503                 fe->ops.i2c_gate_ctrl(fe, 0);
 504
 505         if (ret) {
 506                 dev_dbg(&i2c->dev, "%s: failed: %d\n", __func__, ret);
 507                 kfree(priv);
 508                 return NULL;
 509         }
 510
 511         return fe;
 512 }
 513 EXPORT_SYMBOL(fc0012_attach);
 514
 515 MODULE_DESCRIPTION("Fitipower FC0012 silicon tuner driver");
 516 MODULE_AUTHOR("Hans-Frieder Vogt <hfvogt@gmx.net>");
 517 MODULE_LICENSE("GPL");
 518 MODULE_VERSION("0.6");