drivers/media/dvb-frontends/ts2020.c

   1 /*
   2     Montage Technology TS2020 - Silicon Tuner driver
   3     Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>
   4
   5     Copyright (C) 2009-2012 TurboSight.com
   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     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "dvb_frontend.h"
  23 #include "ts2020.h"
  24 #include <linux/regmap.h>
  25 #include <linux/math64.h>
  26
  27 #define TS2020_XTAL_FREQ   27000 /* in kHz */
  28 #define FREQ_OFFSET_LOW_SYM_RATE 3000
  29
  30 struct ts2020_priv {
  31         struct i2c_client *client;
  32         struct mutex regmap_mutex;
  33         struct regmap_config regmap_config;
  34         struct regmap *regmap;
  35         struct dvb_frontend *fe;
  36         struct delayed_work stat_work;
  37         int (*get_agc_pwm)(struct dvb_frontend *fe, u8 *_agc_pwm);
  38         /* i2c details */
  39         struct i2c_adapter *i2c;
  40         int i2c_address;
  41         bool loop_through:1;
  42         u8 clk_out:2;
  43         u8 clk_out_div:5;
  44         bool dont_poll:1;
  45         u32 frequency_div; /* LO output divider switch frequency */
  46         u32 frequency_khz; /* actual used LO frequency */
  47 #define TS2020_M88TS2020 0
  48 #define TS2020_M88TS2022 1
  49         u8 tuner;
  50 };
  51
  52 struct ts2020_reg_val {
  53         u8 reg;
  54         u8 val;
  55 };
  56
  57 static void ts2020_stat_work(struct work_struct *work);
  58
  59 static int ts2020_release(struct dvb_frontend *fe)
  60 {
  61         struct ts2020_priv *priv = fe->tuner_priv;
  62         struct i2c_client *client = priv->client;
  63
  64         dev_dbg(&client->dev, "\n");
  65
  66         i2c_unregister_device(client);
  67         return 0;
  68 }
  69
  70 static int ts2020_sleep(struct dvb_frontend *fe)
  71 {
  72         struct ts2020_priv *priv = fe->tuner_priv;
  73         int ret;
  74         u8 u8tmp;
  75
  76         if (priv->tuner == TS2020_M88TS2020)
  77                 u8tmp = 0x0a; /* XXX: probably wrong */
  78         else
  79                 u8tmp = 0x00;
  80
  81         ret = regmap_write(priv->regmap, u8tmp, 0x00);
  82         if (ret < 0)
  83                 return ret;
  84
  85         /* stop statistics polling */
  86         if (!priv->dont_poll)
  87                 cancel_delayed_work_sync(&priv->stat_work);
  88         return 0;
  89 }
  90
  91 static int ts2020_init(struct dvb_frontend *fe)
  92 {
  93         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  94         struct ts2020_priv *priv = fe->tuner_priv;
  95         int i;
  96         u8 u8tmp;
  97
  98         if (priv->tuner == TS2020_M88TS2020) {
  99                 regmap_write(priv->regmap, 0x42, 0x73);
 100                 regmap_write(priv->regmap, 0x05, priv->clk_out_div);
 101                 regmap_write(priv->regmap, 0x20, 0x27);
 102                 regmap_write(priv->regmap, 0x07, 0x02);
 103                 regmap_write(priv->regmap, 0x11, 0xff);
 104                 regmap_write(priv->regmap, 0x60, 0xf9);
 105                 regmap_write(priv->regmap, 0x08, 0x01);
 106                 regmap_write(priv->regmap, 0x00, 0x41);
 107         } else {
 108                 static const struct ts2020_reg_val reg_vals[] = {
 109                         {0x7d, 0x9d},
 110                         {0x7c, 0x9a},
 111                         {0x7a, 0x76},
 112                         {0x3b, 0x01},
 113                         {0x63, 0x88},
 114                         {0x61, 0x85},
 115                         {0x22, 0x30},
 116                         {0x30, 0x40},
 117                         {0x20, 0x23},
 118                         {0x24, 0x02},
 119                         {0x12, 0xa0},
 120                 };
 121
 122                 regmap_write(priv->regmap, 0x00, 0x01);
 123                 regmap_write(priv->regmap, 0x00, 0x03);
 124
 125                 switch (priv->clk_out) {
 126                 case TS2020_CLK_OUT_DISABLED:
 127                         u8tmp = 0x60;
 128                         break;
 129                 case TS2020_CLK_OUT_ENABLED:
 130                         u8tmp = 0x70;
 131                         regmap_write(priv->regmap, 0x05, priv->clk_out_div);
 132                         break;
 133                 case TS2020_CLK_OUT_ENABLED_XTALOUT:
 134                         u8tmp = 0x6c;
 135                         break;
 136                 default:
 137                         u8tmp = 0x60;
 138                         break;
 139                 }
 140
 141                 regmap_write(priv->regmap, 0x42, u8tmp);
 142
 143                 if (priv->loop_through)
 144                         u8tmp = 0xec;
 145                 else
 146                         u8tmp = 0x6c;
 147
 148                 regmap_write(priv->regmap, 0x62, u8tmp);
 149
 150                 for (i = 0; i < ARRAY_SIZE(reg_vals); i++)
 151                         regmap_write(priv->regmap, reg_vals[i].reg,
 152                                      reg_vals[i].val);
 153         }
 154
 155         /* Initialise v5 stats here */
 156         c->strength.len = 1;
 157         c->strength.stat[0].scale = FE_SCALE_DECIBEL;
 158         c->strength.stat[0].uvalue = 0;
 159
 160         /* Start statistics polling by invoking the work function */
 161         ts2020_stat_work(&priv->stat_work.work);
 162         return 0;
 163 }
 164
 165 static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset)
 166 {
 167         struct ts2020_priv *priv = fe->tuner_priv;
 168         int ret;
 169         ret = regmap_write(priv->regmap, 0x51, 0x1f - offset);
 170         ret |= regmap_write(priv->regmap, 0x51, 0x1f);
 171         ret |= regmap_write(priv->regmap, 0x50, offset);
 172         ret |= regmap_write(priv->regmap, 0x50, 0x00);
 173         msleep(20);
 174         return ret;
 175 }
 176
 177 static int ts2020_set_tuner_rf(struct dvb_frontend *fe)
 178 {
 179         struct ts2020_priv *dev = fe->tuner_priv;
 180         int ret;
 181         unsigned int utmp;
 182
 183         ret = regmap_read(dev->regmap, 0x3d, &utmp);
 184         utmp &= 0x7f;
 185         if (utmp < 0x16)
 186                 utmp = 0xa1;
 187         else if (utmp == 0x16)
 188                 utmp = 0x99;
 189         else
 190                 utmp = 0xf9;
 191
 192         regmap_write(dev->regmap, 0x60, utmp);
 193         ret = ts2020_tuner_gate_ctrl(fe, 0x08);
 194
 195         return ret;
 196 }
 197
 198 static int ts2020_set_params(struct dvb_frontend *fe)
 199 {
 200         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 201         struct ts2020_priv *priv = fe->tuner_priv;
 202         int ret;
 203         unsigned int utmp;
 204         u32 f3db, gdiv28;
 205         u16 u16tmp, value, lpf_coeff;
 206         u8 buf[3], reg10, lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
 207         unsigned int f_ref_khz, f_vco_khz, div_ref, div_out, pll_n;
 208         unsigned int frequency_khz = c->frequency;
 209
 210         /*
 211          * Integer-N PLL synthesizer
 212          * kHz is used for all calculations to keep calculations within 32-bit
 213          */
 214         f_ref_khz = TS2020_XTAL_FREQ;
 215         div_ref = DIV_ROUND_CLOSEST(f_ref_khz, 2000);
 216
 217         /* select LO output divider */
 218         if (frequency_khz < priv->frequency_div) {
 219                 div_out = 4;
 220                 reg10 = 0x10;
 221         } else {
 222                 div_out = 2;
 223                 reg10 = 0x00;
 224         }
 225
 226         f_vco_khz = frequency_khz * div_out;
 227         pll_n = f_vco_khz * div_ref / f_ref_khz;
 228         pll_n += pll_n % 2;
 229         priv->frequency_khz = pll_n * f_ref_khz / div_ref / div_out;
 230
 231         pr_debug("frequency=%u offset=%d f_vco_khz=%u pll_n=%u div_ref=%u div_out=%u\n",
 232                  priv->frequency_khz, priv->frequency_khz - c->frequency,
 233                  f_vco_khz, pll_n, div_ref, div_out);
 234
 235         if (priv->tuner == TS2020_M88TS2020) {
 236                 lpf_coeff = 2766;
 237                 reg10 |= 0x01;
 238                 ret = regmap_write(priv->regmap, 0x10, reg10);
 239         } else {
 240                 lpf_coeff = 3200;
 241                 reg10 |= 0x0b;
 242                 ret = regmap_write(priv->regmap, 0x10, reg10);
 243                 ret |= regmap_write(priv->regmap, 0x11, 0x40);
 244         }
 245
 246         u16tmp = pll_n - 1024;
 247         buf[0] = (u16tmp >> 8) & 0xff;
 248         buf[1] = (u16tmp >> 0) & 0xff;
 249         buf[2] = div_ref - 8;
 250
 251         ret |= regmap_write(priv->regmap, 0x01, buf[0]);
 252         ret |= regmap_write(priv->regmap, 0x02, buf[1]);
 253         ret |= regmap_write(priv->regmap, 0x03, buf[2]);
 254
 255         ret |= ts2020_tuner_gate_ctrl(fe, 0x10);
 256         if (ret < 0)
 257                 return -ENODEV;
 258
 259         ret |= ts2020_tuner_gate_ctrl(fe, 0x08);
 260
 261         /* Tuner RF */
 262         if (priv->tuner == TS2020_M88TS2020)
 263                 ret |= ts2020_set_tuner_rf(fe);
 264
 265         gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000;
 266         ret |= regmap_write(priv->regmap, 0x04, gdiv28 & 0xff);
 267         ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
 268         if (ret < 0)
 269                 return -ENODEV;
 270
 271         if (priv->tuner == TS2020_M88TS2022) {
 272                 ret = regmap_write(priv->regmap, 0x25, 0x00);
 273                 ret |= regmap_write(priv->regmap, 0x27, 0x70);
 274                 ret |= regmap_write(priv->regmap, 0x41, 0x09);
 275                 ret |= regmap_write(priv->regmap, 0x08, 0x0b);
 276                 if (ret < 0)
 277                         return -ENODEV;
 278         }
 279
 280         regmap_read(priv->regmap, 0x26, &utmp);
 281         value = utmp;
 282
 283         f3db = (c->bandwidth_hz / 1000 / 2) + 2000;
 284         f3db += FREQ_OFFSET_LOW_SYM_RATE; /* FIXME: ~always too wide filter */
 285         f3db = clamp(f3db, 7000U, 40000U);
 286
 287         gdiv28 = gdiv28 * 207 / (value * 2 + 151);
 288         mlpf_max = gdiv28 * 135 / 100;
 289         mlpf_min = gdiv28 * 78 / 100;
 290         if (mlpf_max > 63)
 291                 mlpf_max = 63;
 292
 293         nlpf = (f3db * gdiv28 * 2 / lpf_coeff /
 294                 (TS2020_XTAL_FREQ / 1000)  + 1) / 2;
 295         if (nlpf > 23)
 296                 nlpf = 23;
 297         if (nlpf < 1)
 298                 nlpf = 1;
 299
 300         lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 301                 * lpf_coeff * 2  / f3db + 1) / 2;
 302
 303         if (lpf_mxdiv < mlpf_min) {
 304                 nlpf++;
 305                 lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 306                         * lpf_coeff * 2  / f3db + 1) / 2;
 307         }
 308
 309         if (lpf_mxdiv > mlpf_max)
 310                 lpf_mxdiv = mlpf_max;
 311
 312         ret = regmap_write(priv->regmap, 0x04, lpf_mxdiv);
 313         ret |= regmap_write(priv->regmap, 0x06, nlpf);
 314
 315         ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
 316
 317         ret |= ts2020_tuner_gate_ctrl(fe, 0x01);
 318
 319         msleep(80);
 320
 321         return (ret < 0) ? -EINVAL : 0;
 322 }
 323
 324 static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 325 {
 326         struct ts2020_priv *priv = fe->tuner_priv;
 327
 328         *frequency = priv->frequency_khz;
 329         return 0;
 330 }
 331
 332 static int ts2020_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 333 {
 334         *frequency = 0; /* Zero-IF */
 335         return 0;
 336 }
 337
 338 /*
 339  * Get the tuner gain.
 340  * @fe: The front end for which we're determining the gain
 341  * @v_agc: The voltage of the AGC from the demodulator (0-2600mV)
 342  * @_gain: Where to store the gain (in 0.001dB units)
 343  *
 344  * Returns 0 or a negative error code.
 345  */
 346 static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc,
 347                                   __s64 *_gain)
 348 {
 349         struct ts2020_priv *priv = fe->tuner_priv;
 350         unsigned long gain1, gain2, gain3;
 351         unsigned utmp;
 352         int ret;
 353
 354         /* Read the RF gain */
 355         ret = regmap_read(priv->regmap, 0x3d, &utmp);
 356         if (ret < 0)
 357                 return ret;
 358         gain1 = utmp & 0x1f;
 359
 360         /* Read the baseband gain */
 361         ret = regmap_read(priv->regmap, 0x21, &utmp);
 362         if (ret < 0)
 363                 return ret;
 364         gain2 = utmp & 0x1f;
 365
 366         switch (priv->tuner) {
 367         case TS2020_M88TS2020:
 368                 gain1 = clamp_t(long, gain1, 0, 15);
 369                 gain2 = clamp_t(long, gain2, 0, 13);
 370                 v_agc = clamp_t(long, v_agc, 400, 1100);
 371
 372                 *_gain = -(gain1 * 2330 +
 373                            gain2 * 3500 +
 374                            v_agc * 24 / 10 * 10 +
 375                            10000);
 376                 /* gain in range -19600 to -116850 in units of 0.001dB */
 377                 break;
 378
 379         case TS2020_M88TS2022:
 380                 ret = regmap_read(priv->regmap, 0x66, &utmp);
 381                 if (ret < 0)
 382                         return ret;
 383                 gain3 = (utmp >> 3) & 0x07;
 384
 385                 gain1 = clamp_t(long, gain1, 0, 15);
 386                 gain2 = clamp_t(long, gain2, 2, 16);
 387                 gain3 = clamp_t(long, gain3, 0, 6);
 388                 v_agc = clamp_t(long, v_agc, 600, 1600);
 389
 390                 *_gain = -(gain1 * 2650 +
 391                            gain2 * 3380 +
 392                            gain3 * 2850 +
 393                            v_agc * 176 / 100 * 10 -
 394                            30000);
 395                 /* gain in range -47320 to -158950 in units of 0.001dB */
 396                 break;
 397         }
 398
 399         return 0;
 400 }
 401
 402 /*
 403  * Get the AGC information from the demodulator and use that to calculate the
 404  * tuner gain.
 405  */
 406 static int ts2020_get_tuner_gain(struct dvb_frontend *fe, __s64 *_gain)
 407 {
 408         struct ts2020_priv *priv = fe->tuner_priv;
 409         int v_agc = 0, ret;
 410         u8 agc_pwm;
 411
 412         /* Read the AGC PWM rate from the demodulator */
 413         if (priv->get_agc_pwm) {
 414                 ret = priv->get_agc_pwm(fe, &agc_pwm);
 415                 if (ret < 0)
 416                         return ret;
 417
 418                 switch (priv->tuner) {
 419                 case TS2020_M88TS2020:
 420                         v_agc = (int)agc_pwm * 20 - 1166;
 421                         break;
 422                 case TS2020_M88TS2022:
 423                         v_agc = (int)agc_pwm * 16 - 670;
 424                         break;
 425                 }
 426
 427                 if (v_agc < 0)
 428                         v_agc = 0;
 429         }
 430
 431         return ts2020_read_tuner_gain(fe, v_agc, _gain);
 432 }
 433
 434 /*
 435  * Gather statistics on a regular basis
 436  */
 437 static void ts2020_stat_work(struct work_struct *work)
 438 {
 439         struct ts2020_priv *priv = container_of(work, struct ts2020_priv,
 440                                                stat_work.work);
 441         struct i2c_client *client = priv->client;
 442         struct dtv_frontend_properties *c = &priv->fe->dtv_property_cache;
 443         int ret;
 444
 445         dev_dbg(&client->dev, "\n");
 446
 447         ret = ts2020_get_tuner_gain(priv->fe, &c->strength.stat[0].svalue);
 448         if (ret < 0)
 449                 goto err;
 450
 451         c->strength.stat[0].scale = FE_SCALE_DECIBEL;
 452
 453         if (!priv->dont_poll)
 454                 schedule_delayed_work(&priv->stat_work, msecs_to_jiffies(2000));
 455         return;
 456 err:
 457         dev_dbg(&client->dev, "failed=%d\n", ret);
 458 }
 459
 460 /*
 461  * Read TS2020 signal strength in v3 format.
 462  */
 463 static int ts2020_read_signal_strength(struct dvb_frontend *fe,
 464                                        u16 *_signal_strength)
 465 {
 466         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 467         struct ts2020_priv *priv = fe->tuner_priv;
 468         unsigned strength;
 469         __s64 gain;
 470
 471         if (priv->dont_poll)
 472                 ts2020_stat_work(&priv->stat_work.work);
 473
 474         if (c->strength.stat[0].scale == FE_SCALE_NOT_AVAILABLE) {
 475                 *_signal_strength = 0;
 476                 return 0;
 477         }
 478
 479         gain = c->strength.stat[0].svalue;
 480
 481         /* Calculate the signal strength based on the total gain of the tuner */
 482         if (gain < -85000)
 483                 /* 0%: no signal or weak signal */
 484                 strength = 0;
 485         else if (gain < -65000)
 486                 /* 0% - 60%: weak signal */
 487                 strength = 0 + div64_s64((85000 + gain) * 3, 1000);
 488         else if (gain < -45000)
 489                 /* 60% - 90%: normal signal */
 490                 strength = 60 + div64_s64((65000 + gain) * 3, 2000);
 491         else
 492                 /* 90% - 99%: strong signal */
 493                 strength = 90 + div64_s64((45000 + gain), 5000);
 494
 495         *_signal_strength = strength * 65535 / 100;
 496         return 0;
 497 }
 498
 499 static struct dvb_tuner_ops ts2020_tuner_ops = {
 500         .info = {
 501                 .name = "TS2020",
 502                 .frequency_min = 950000,
 503                 .frequency_max = 2150000
 504         },
 505         .init = ts2020_init,
 506         .release = ts2020_release,
 507         .sleep = ts2020_sleep,
 508         .set_params = ts2020_set_params,
 509         .get_frequency = ts2020_get_frequency,
 510         .get_if_frequency = ts2020_get_if_frequency,
 511         .get_rf_strength = ts2020_read_signal_strength,
 512 };
 513
 514 struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
 515                                         const struct ts2020_config *config,
 516                                         struct i2c_adapter *i2c)
 517 {
 518         struct i2c_client *client;
 519         struct i2c_board_info board_info;
 520
 521         /* This is only used by ts2020_probe() so can be on the stack */
 522         struct ts2020_config pdata;
 523
 524         memcpy(&pdata, config, sizeof(pdata));
 525         pdata.fe = fe;
 526         pdata.attach_in_use = true;
 527
 528         memset(&board_info, 0, sizeof(board_info));
 529         strlcpy(board_info.type, "ts2020", I2C_NAME_SIZE);
 530         board_info.addr = config->tuner_address;
 531         board_info.platform_data = &pdata;
 532         client = i2c_new_device(i2c, &board_info);
 533         if (!client || !client->dev.driver)
 534                 return NULL;
 535
 536         return fe;
 537 }
 538 EXPORT_SYMBOL(ts2020_attach);
 539
 540 /*
 541  * We implement own regmap locking due to legacy DVB attach which uses frontend
 542  * gate control callback to control I2C bus access. We can open / close gate and
 543  * serialize whole open / I2C-operation / close sequence at the same.
 544  */
 545 static void ts2020_regmap_lock(void *__dev)
 546 {
 547         struct ts2020_priv *dev = __dev;
 548
 549         mutex_lock(&dev->regmap_mutex);
 550         if (dev->fe->ops.i2c_gate_ctrl)
 551                 dev->fe->ops.i2c_gate_ctrl(dev->fe, 1);
 552 }
 553
 554 static void ts2020_regmap_unlock(void *__dev)
 555 {
 556         struct ts2020_priv *dev = __dev;
 557
 558         if (dev->fe->ops.i2c_gate_ctrl)
 559                 dev->fe->ops.i2c_gate_ctrl(dev->fe, 0);
 560         mutex_unlock(&dev->regmap_mutex);
 561 }
 562
 563 static int ts2020_probe(struct i2c_client *client,
 564                 const struct i2c_device_id *id)
 565 {
 566         struct ts2020_config *pdata = client->dev.platform_data;
 567         struct dvb_frontend *fe = pdata->fe;
 568         struct ts2020_priv *dev;
 569         int ret;
 570         u8 u8tmp;
 571         unsigned int utmp;
 572         char *chip_str;
 573
 574         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 575         if (!dev) {
 576                 ret = -ENOMEM;
 577                 goto err;
 578         }
 579
 580         /* create regmap */
 581         mutex_init(&dev->regmap_mutex);
 582         dev->regmap_config.reg_bits = 8,
 583         dev->regmap_config.val_bits = 8,
 584         dev->regmap_config.lock = ts2020_regmap_lock,
 585         dev->regmap_config.unlock = ts2020_regmap_unlock,
 586         dev->regmap_config.lock_arg = dev,
 587         dev->regmap = regmap_init_i2c(client, &dev->regmap_config);
 588         if (IS_ERR(dev->regmap)) {
 589                 ret = PTR_ERR(dev->regmap);
 590                 goto err_kfree;
 591         }
 592
 593         dev->i2c = client->adapter;
 594         dev->i2c_address = client->addr;
 595         dev->loop_through = pdata->loop_through;
 596         dev->clk_out = pdata->clk_out;
 597         dev->clk_out_div = pdata->clk_out_div;
 598         dev->dont_poll = pdata->dont_poll;
 599         dev->frequency_div = pdata->frequency_div;
 600         dev->fe = fe;
 601         dev->get_agc_pwm = pdata->get_agc_pwm;
 602         fe->tuner_priv = dev;
 603         dev->client = client;
 604         INIT_DELAYED_WORK(&dev->stat_work, ts2020_stat_work);
 605
 606         /* check if the tuner is there */
 607         ret = regmap_read(dev->regmap, 0x00, &utmp);
 608         if (ret)
 609                 goto err_regmap_exit;
 610
 611         if ((utmp & 0x03) == 0x00) {
 612                 ret = regmap_write(dev->regmap, 0x00, 0x01);
 613                 if (ret)
 614                         goto err_regmap_exit;
 615
 616                 usleep_range(2000, 50000);
 617         }
 618
 619         ret = regmap_write(dev->regmap, 0x00, 0x03);
 620         if (ret)
 621                 goto err_regmap_exit;
 622
 623         usleep_range(2000, 50000);
 624
 625         ret = regmap_read(dev->regmap, 0x00, &utmp);
 626         if (ret)
 627                 goto err_regmap_exit;
 628
 629         dev_dbg(&client->dev, "chip_id=%02x\n", utmp);
 630
 631         switch (utmp) {
 632         case 0x01:
 633         case 0x41:
 634         case 0x81:
 635                 dev->tuner = TS2020_M88TS2020;
 636                 chip_str = "TS2020";
 637                 if (!dev->frequency_div)
 638                         dev->frequency_div = 1060000;
 639                 break;
 640         case 0xc3:
 641         case 0x83:
 642                 dev->tuner = TS2020_M88TS2022;
 643                 chip_str = "TS2022";
 644                 if (!dev->frequency_div)
 645                         dev->frequency_div = 1103000;
 646                 break;
 647         default:
 648                 ret = -ENODEV;
 649                 goto err_regmap_exit;
 650         }
 651
 652         if (dev->tuner == TS2020_M88TS2022) {
 653                 switch (dev->clk_out) {
 654                 case TS2020_CLK_OUT_DISABLED:
 655                         u8tmp = 0x60;
 656                         break;
 657                 case TS2020_CLK_OUT_ENABLED:
 658                         u8tmp = 0x70;
 659                         ret = regmap_write(dev->regmap, 0x05, dev->clk_out_div);
 660                         if (ret)
 661                                 goto err_regmap_exit;
 662                         break;
 663                 case TS2020_CLK_OUT_ENABLED_XTALOUT:
 664                         u8tmp = 0x6c;
 665                         break;
 666                 default:
 667                         ret = -EINVAL;
 668                         goto err_regmap_exit;
 669                 }
 670
 671                 ret = regmap_write(dev->regmap, 0x42, u8tmp);
 672                 if (ret)
 673                         goto err_regmap_exit;
 674
 675                 if (dev->loop_through)
 676                         u8tmp = 0xec;
 677                 else
 678                         u8tmp = 0x6c;
 679
 680                 ret = regmap_write(dev->regmap, 0x62, u8tmp);
 681                 if (ret)
 682                         goto err_regmap_exit;
 683         }
 684
 685         /* sleep */
 686         ret = regmap_write(dev->regmap, 0x00, 0x00);
 687         if (ret)
 688                 goto err_regmap_exit;
 689
 690         dev_info(&client->dev,
 691                  "Montage Technology %s successfully identified\n", chip_str);
 692
 693         memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops,
 694                         sizeof(struct dvb_tuner_ops));
 695         if (!pdata->attach_in_use)
 696                 fe->ops.tuner_ops.release = NULL;
 697
 698         i2c_set_clientdata(client, dev);
 699         return 0;
 700 err_regmap_exit:
 701         regmap_exit(dev->regmap);
 702 err_kfree:
 703         kfree(dev);
 704 err:
 705         dev_dbg(&client->dev, "failed=%d\n", ret);
 706         return ret;
 707 }
 708
 709 static int ts2020_remove(struct i2c_client *client)
 710 {
 711         struct ts2020_priv *dev = i2c_get_clientdata(client);
 712
 713         dev_dbg(&client->dev, "\n");
 714
 715         regmap_exit(dev->regmap);
 716         kfree(dev);
 717         return 0;
 718 }
 719
 720 static const struct i2c_device_id ts2020_id_table[] = {
 721         {"ts2020", 0},
 722         {"ts2022", 0},
 723         {}
 724 };
 725 MODULE_DEVICE_TABLE(i2c, ts2020_id_table);
 726
 727 static struct i2c_driver ts2020_driver = {
 728         .driver = {
 729                 .name   = "ts2020",
 730         },
 731         .probe          = ts2020_probe,
 732         .remove         = ts2020_remove,
 733         .id_table       = ts2020_id_table,
 734 };
 735
 736 module_i2c_driver(ts2020_driver);
 737
 738 MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
 739 MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
 740 MODULE_LICENSE("GPL");