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