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         if (ret)
 184                 return ret;
 185
 186         utmp &= 0x7f;
 187         if (utmp < 0x16)
 188                 utmp = 0xa1;
 189         else if (utmp == 0x16)
 190                 utmp = 0x99;
 191         else
 192                 utmp = 0xf9;
 193
 194         regmap_write(dev->regmap, 0x60, utmp);
 195         ret = ts2020_tuner_gate_ctrl(fe, 0x08);
 196
 197         return ret;
 198 }
 199
 200 static int ts2020_set_params(struct dvb_frontend *fe)
 201 {
 202         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 203         struct ts2020_priv *priv = fe->tuner_priv;
 204         int ret;
 205         unsigned int utmp;
 206         u32 f3db, gdiv28;
 207         u16 u16tmp, value, lpf_coeff;
 208         u8 buf[3], reg10, lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
 209         unsigned int f_ref_khz, f_vco_khz, div_ref, div_out, pll_n;
 210         unsigned int frequency_khz = c->frequency;
 211
 212         /*
 213          * Integer-N PLL synthesizer
 214          * kHz is used for all calculations to keep calculations within 32-bit
 215          */
 216         f_ref_khz = TS2020_XTAL_FREQ;
 217         div_ref = DIV_ROUND_CLOSEST(f_ref_khz, 2000);
 218
 219         /* select LO output divider */
 220         if (frequency_khz < priv->frequency_div) {
 221                 div_out = 4;
 222                 reg10 = 0x10;
 223         } else {
 224                 div_out = 2;
 225                 reg10 = 0x00;
 226         }
 227
 228         f_vco_khz = frequency_khz * div_out;
 229         pll_n = f_vco_khz * div_ref / f_ref_khz;
 230         pll_n += pll_n % 2;
 231         priv->frequency_khz = pll_n * f_ref_khz / div_ref / div_out;
 232
 233         pr_debug("frequency=%u offset=%d f_vco_khz=%u pll_n=%u div_ref=%u div_out=%u\n",
 234                  priv->frequency_khz, priv->frequency_khz - c->frequency,
 235                  f_vco_khz, pll_n, div_ref, div_out);
 236
 237         if (priv->tuner == TS2020_M88TS2020) {
 238                 lpf_coeff = 2766;
 239                 reg10 |= 0x01;
 240                 ret = regmap_write(priv->regmap, 0x10, reg10);
 241         } else {
 242                 lpf_coeff = 3200;
 243                 reg10 |= 0x0b;
 244                 ret = regmap_write(priv->regmap, 0x10, reg10);
 245                 ret |= regmap_write(priv->regmap, 0x11, 0x40);
 246         }
 247
 248         u16tmp = pll_n - 1024;
 249         buf[0] = (u16tmp >> 8) & 0xff;
 250         buf[1] = (u16tmp >> 0) & 0xff;
 251         buf[2] = div_ref - 8;
 252
 253         ret |= regmap_write(priv->regmap, 0x01, buf[0]);
 254         ret |= regmap_write(priv->regmap, 0x02, buf[1]);
 255         ret |= regmap_write(priv->regmap, 0x03, buf[2]);
 256
 257         ret |= ts2020_tuner_gate_ctrl(fe, 0x10);
 258         if (ret < 0)
 259                 return -ENODEV;
 260
 261         ret |= ts2020_tuner_gate_ctrl(fe, 0x08);
 262
 263         /* Tuner RF */
 264         if (priv->tuner == TS2020_M88TS2020)
 265                 ret |= ts2020_set_tuner_rf(fe);
 266
 267         gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000;
 268         ret |= regmap_write(priv->regmap, 0x04, gdiv28 & 0xff);
 269         ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
 270         if (ret < 0)
 271                 return -ENODEV;
 272
 273         if (priv->tuner == TS2020_M88TS2022) {
 274                 ret = regmap_write(priv->regmap, 0x25, 0x00);
 275                 ret |= regmap_write(priv->regmap, 0x27, 0x70);
 276                 ret |= regmap_write(priv->regmap, 0x41, 0x09);
 277                 ret |= regmap_write(priv->regmap, 0x08, 0x0b);
 278                 if (ret < 0)
 279                         return -ENODEV;
 280         }
 281
 282         regmap_read(priv->regmap, 0x26, &utmp);
 283         value = utmp;
 284
 285         f3db = (c->bandwidth_hz / 1000 / 2) + 2000;
 286         f3db += FREQ_OFFSET_LOW_SYM_RATE; /* FIXME: ~always too wide filter */
 287         f3db = clamp(f3db, 7000U, 40000U);
 288
 289         gdiv28 = gdiv28 * 207 / (value * 2 + 151);
 290         mlpf_max = gdiv28 * 135 / 100;
 291         mlpf_min = gdiv28 * 78 / 100;
 292         if (mlpf_max > 63)
 293                 mlpf_max = 63;
 294
 295         nlpf = (f3db * gdiv28 * 2 / lpf_coeff /
 296                 (TS2020_XTAL_FREQ / 1000)  + 1) / 2;
 297         if (nlpf > 23)
 298                 nlpf = 23;
 299         if (nlpf < 1)
 300                 nlpf = 1;
 301
 302         lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 303                 * lpf_coeff * 2  / f3db + 1) / 2;
 304
 305         if (lpf_mxdiv < mlpf_min) {
 306                 nlpf++;
 307                 lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 308                         * lpf_coeff * 2  / f3db + 1) / 2;
 309         }
 310
 311         if (lpf_mxdiv > mlpf_max)
 312                 lpf_mxdiv = mlpf_max;
 313
 314         ret = regmap_write(priv->regmap, 0x04, lpf_mxdiv);
 315         ret |= regmap_write(priv->regmap, 0x06, nlpf);
 316
 317         ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
 318
 319         ret |= ts2020_tuner_gate_ctrl(fe, 0x01);
 320
 321         msleep(80);
 322
 323         return (ret < 0) ? -EINVAL : 0;
 324 }
 325
 326 static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 327 {
 328         struct ts2020_priv *priv = fe->tuner_priv;
 329
 330         *frequency = priv->frequency_khz;
 331         return 0;
 332 }
 333
 334 static int ts2020_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 335 {
 336         *frequency = 0; /* Zero-IF */
 337         return 0;
 338 }
 339
 340 /*
 341  * Get the tuner gain.
 342  * @fe: The front end for which we're determining the gain
 343  * @v_agc: The voltage of the AGC from the demodulator (0-2600mV)
 344  * @_gain: Where to store the gain (in 0.001dB units)
 345  *
 346  * Returns 0 or a negative error code.
 347  */
 348 static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc,
 349                                   __s64 *_gain)
 350 {
 351         struct ts2020_priv *priv = fe->tuner_priv;
 352         unsigned long gain1, gain2, gain3;
 353         unsigned utmp;
 354         int ret;
 355
 356         /* Read the RF gain */
 357         ret = regmap_read(priv->regmap, 0x3d, &utmp);
 358         if (ret < 0)
 359                 return ret;
 360         gain1 = utmp & 0x1f;
 361
 362         /* Read the baseband gain */
 363         ret = regmap_read(priv->regmap, 0x21, &utmp);
 364         if (ret < 0)
 365                 return ret;
 366         gain2 = utmp & 0x1f;
 367
 368         switch (priv->tuner) {
 369         case TS2020_M88TS2020:
 370                 gain1 = clamp_t(long, gain1, 0, 15);
 371                 gain2 = clamp_t(long, gain2, 0, 13);
 372                 v_agc = clamp_t(long, v_agc, 400, 1100);
 373
 374                 *_gain = -((__s64)gain1 * 2330 +
 375                            gain2 * 3500 +
 376                            v_agc * 24 / 10 * 10 +
 377                            10000);
 378                 /* gain in range -19600 to -116850 in units of 0.001dB */
 379                 break;
 380
 381         case TS2020_M88TS2022:
 382                 ret = regmap_read(priv->regmap, 0x66, &utmp);
 383                 if (ret < 0)
 384                         return ret;
 385                 gain3 = (utmp >> 3) & 0x07;
 386
 387                 gain1 = clamp_t(long, gain1, 0, 15);
 388                 gain2 = clamp_t(long, gain2, 2, 16);
 389                 gain3 = clamp_t(long, gain3, 0, 6);
 390                 v_agc = clamp_t(long, v_agc, 600, 1600);
 391
 392                 *_gain = -((__s64)gain1 * 2650 +
 393                            gain2 * 3380 +
 394                            gain3 * 2850 +
 395                            v_agc * 176 / 100 * 10 -
 396                            30000);
 397                 /* gain in range -47320 to -158950 in units of 0.001dB */
 398                 break;
 399         }
 400
 401         return 0;
 402 }
 403
 404 /*
 405  * Get the AGC information from the demodulator and use that to calculate the
 406  * tuner gain.
 407  */
 408 static int ts2020_get_tuner_gain(struct dvb_frontend *fe, __s64 *_gain)
 409 {
 410         struct ts2020_priv *priv = fe->tuner_priv;
 411         int v_agc = 0, ret;
 412         u8 agc_pwm;
 413
 414         /* Read the AGC PWM rate from the demodulator */
 415         if (priv->get_agc_pwm) {
 416                 ret = priv->get_agc_pwm(fe, &agc_pwm);
 417                 if (ret < 0)
 418                         return ret;
 419
 420                 switch (priv->tuner) {
 421                 case TS2020_M88TS2020:
 422                         v_agc = (int)agc_pwm * 20 - 1166;
 423                         break;
 424                 case TS2020_M88TS2022:
 425                         v_agc = (int)agc_pwm * 16 - 670;
 426                         break;
 427                 }
 428
 429                 if (v_agc < 0)
 430                         v_agc = 0;
 431         }
 432
 433         return ts2020_read_tuner_gain(fe, v_agc, _gain);
 434 }
 435
 436 /*
 437  * Gather statistics on a regular basis
 438  */
 439 static void ts2020_stat_work(struct work_struct *work)
 440 {
 441         struct ts2020_priv *priv = container_of(work, struct ts2020_priv,
 442                                                stat_work.work);
 443         struct i2c_client *client = priv->client;
 444         struct dtv_frontend_properties *c = &priv->fe->dtv_property_cache;
 445         int ret;
 446
 447         dev_dbg(&client->dev, "\n");
 448
 449         ret = ts2020_get_tuner_gain(priv->fe, &c->strength.stat[0].svalue);
 450         if (ret < 0)
 451                 goto err;
 452
 453         c->strength.stat[0].scale = FE_SCALE_DECIBEL;
 454
 455         if (!priv->dont_poll)
 456                 schedule_delayed_work(&priv->stat_work, msecs_to_jiffies(2000));
 457         return;
 458 err:
 459         dev_dbg(&client->dev, "failed=%d\n", ret);
 460 }
 461
 462 /*
 463  * Read TS2020 signal strength in v3 format.
 464  */
 465 static int ts2020_read_signal_strength(struct dvb_frontend *fe,
 466                                        u16 *_signal_strength)
 467 {
 468         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 469         struct ts2020_priv *priv = fe->tuner_priv;
 470         unsigned strength;
 471         __s64 gain;
 472
 473         if (priv->dont_poll)
 474                 ts2020_stat_work(&priv->stat_work.work);
 475
 476         if (c->strength.stat[0].scale == FE_SCALE_NOT_AVAILABLE) {
 477                 *_signal_strength = 0;
 478                 return 0;
 479         }
 480
 481         gain = c->strength.stat[0].svalue;
 482
 483         /* Calculate the signal strength based on the total gain of the tuner */
 484         if (gain < -85000)
 485                 /* 0%: no signal or weak signal */
 486                 strength = 0;
 487         else if (gain < -65000)
 488                 /* 0% - 60%: weak signal */
 489                 strength = 0 + div64_s64((85000 + gain) * 3, 1000);
 490         else if (gain < -45000)
 491                 /* 60% - 90%: normal signal */
 492                 strength = 60 + div64_s64((65000 + gain) * 3, 2000);
 493         else
 494                 /* 90% - 99%: strong signal */
 495                 strength = 90 + div64_s64((45000 + gain), 5000);
 496
 497         *_signal_strength = strength * 65535 / 100;
 498         return 0;
 499 }
 500
 501 static const struct dvb_tuner_ops ts2020_tuner_ops = {
 502         .info = {
 503                 .name = "TS2020",
 504                 .frequency_min_hz =  950 * MHz,
 505                 .frequency_max_hz = 2150 * MHz
 506         },
 507         .init = ts2020_init,
 508         .release = ts2020_release,
 509         .sleep = ts2020_sleep,
 510         .set_params = ts2020_set_params,
 511         .get_frequency = ts2020_get_frequency,
 512         .get_if_frequency = ts2020_get_if_frequency,
 513         .get_rf_strength = ts2020_read_signal_strength,
 514 };
 515
 516 struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
 517                                         const struct ts2020_config *config,
 518                                         struct i2c_adapter *i2c)
 519 {
 520         struct i2c_client *client;
 521         struct i2c_board_info board_info;
 522
 523         /* This is only used by ts2020_probe() so can be on the stack */
 524         struct ts2020_config pdata;
 525
 526         memcpy(&pdata, config, sizeof(pdata));
 527         pdata.fe = fe;
 528         pdata.attach_in_use = true;
 529
 530         memset(&board_info, 0, sizeof(board_info));
 531         strscpy(board_info.type, "ts2020", I2C_NAME_SIZE);
 532         board_info.addr = config->tuner_address;
 533         board_info.platform_data = &pdata;
 534         client = i2c_new_device(i2c, &board_info);
 535         if (!client || !client->dev.driver)
 536                 return NULL;
 537
 538         return fe;
 539 }
 540 EXPORT_SYMBOL(ts2020_attach);
 541
 542 /*
 543  * We implement own regmap locking due to legacy DVB attach which uses frontend
 544  * gate control callback to control I2C bus access. We can open / close gate and
 545  * serialize whole open / I2C-operation / close sequence at the same.
 546  */
 547 static void ts2020_regmap_lock(void *__dev)
 548 {
 549         struct ts2020_priv *dev = __dev;
 550
 551         mutex_lock(&dev->regmap_mutex);
 552         if (dev->fe->ops.i2c_gate_ctrl)
 553                 dev->fe->ops.i2c_gate_ctrl(dev->fe, 1);
 554 }
 555
 556 static void ts2020_regmap_unlock(void *__dev)
 557 {
 558         struct ts2020_priv *dev = __dev;
 559
 560         if (dev->fe->ops.i2c_gate_ctrl)
 561                 dev->fe->ops.i2c_gate_ctrl(dev->fe, 0);
 562         mutex_unlock(&dev->regmap_mutex);
 563 }
 564
 565 static int ts2020_probe(struct i2c_client *client,
 566                 const struct i2c_device_id *id)
 567 {
 568         struct ts2020_config *pdata = client->dev.platform_data;
 569         struct dvb_frontend *fe = pdata->fe;
 570         struct ts2020_priv *dev;
 571         int ret;
 572         u8 u8tmp;
 573         unsigned int utmp;
 574         char *chip_str;
 575
 576         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 577         if (!dev) {
 578                 ret = -ENOMEM;
 579                 goto err;
 580         }
 581
 582         /* create regmap */
 583         mutex_init(&dev->regmap_mutex);
 584         dev->regmap_config.reg_bits = 8,
 585         dev->regmap_config.val_bits = 8,
 586         dev->regmap_config.lock = ts2020_regmap_lock,
 587         dev->regmap_config.unlock = ts2020_regmap_unlock,
 588         dev->regmap_config.lock_arg = dev,
 589         dev->regmap = regmap_init_i2c(client, &dev->regmap_config);
 590         if (IS_ERR(dev->regmap)) {
 591                 ret = PTR_ERR(dev->regmap);
 592                 goto err_kfree;
 593         }
 594
 595         dev->i2c = client->adapter;
 596         dev->i2c_address = client->addr;
 597         dev->loop_through = pdata->loop_through;
 598         dev->clk_out = pdata->clk_out;
 599         dev->clk_out_div = pdata->clk_out_div;
 600         dev->dont_poll = pdata->dont_poll;
 601         dev->frequency_div = pdata->frequency_div;
 602         dev->fe = fe;
 603         dev->get_agc_pwm = pdata->get_agc_pwm;
 604         fe->tuner_priv = dev;
 605         dev->client = client;
 606         INIT_DELAYED_WORK(&dev->stat_work, ts2020_stat_work);
 607
 608         /* check if the tuner is there */
 609         ret = regmap_read(dev->regmap, 0x00, &utmp);
 610         if (ret)
 611                 goto err_regmap_exit;
 612
 613         if ((utmp & 0x03) == 0x00) {
 614                 ret = regmap_write(dev->regmap, 0x00, 0x01);
 615                 if (ret)
 616                         goto err_regmap_exit;
 617
 618                 usleep_range(2000, 50000);
 619         }
 620
 621         ret = regmap_write(dev->regmap, 0x00, 0x03);
 622         if (ret)
 623                 goto err_regmap_exit;
 624
 625         usleep_range(2000, 50000);
 626
 627         ret = regmap_read(dev->regmap, 0x00, &utmp);
 628         if (ret)
 629                 goto err_regmap_exit;
 630
 631         dev_dbg(&client->dev, "chip_id=%02x\n", utmp);
 632
 633         switch (utmp) {
 634         case 0x01:
 635         case 0x41:
 636         case 0x81:
 637                 dev->tuner = TS2020_M88TS2020;
 638                 chip_str = "TS2020";
 639                 if (!dev->frequency_div)
 640                         dev->frequency_div = 1060000;
 641                 break;
 642         case 0xc3:
 643         case 0x83:
 644                 dev->tuner = TS2020_M88TS2022;
 645                 chip_str = "TS2022";
 646                 if (!dev->frequency_div)
 647                         dev->frequency_div = 1103000;
 648                 break;
 649         default:
 650                 ret = -ENODEV;
 651                 goto err_regmap_exit;
 652         }
 653
 654         if (dev->tuner == TS2020_M88TS2022) {
 655                 switch (dev->clk_out) {
 656                 case TS2020_CLK_OUT_DISABLED:
 657                         u8tmp = 0x60;
 658                         break;
 659                 case TS2020_CLK_OUT_ENABLED:
 660                         u8tmp = 0x70;
 661                         ret = regmap_write(dev->regmap, 0x05, dev->clk_out_div);
 662                         if (ret)
 663                                 goto err_regmap_exit;
 664                         break;
 665                 case TS2020_CLK_OUT_ENABLED_XTALOUT:
 666                         u8tmp = 0x6c;
 667                         break;
 668                 default:
 669                         ret = -EINVAL;
 670                         goto err_regmap_exit;
 671                 }
 672
 673                 ret = regmap_write(dev->regmap, 0x42, u8tmp);
 674                 if (ret)
 675                         goto err_regmap_exit;
 676
 677                 if (dev->loop_through)
 678                         u8tmp = 0xec;
 679                 else
 680                         u8tmp = 0x6c;
 681
 682                 ret = regmap_write(dev->regmap, 0x62, u8tmp);
 683                 if (ret)
 684                         goto err_regmap_exit;
 685         }
 686
 687         /* sleep */
 688         ret = regmap_write(dev->regmap, 0x00, 0x00);
 689         if (ret)
 690                 goto err_regmap_exit;
 691
 692         dev_info(&client->dev,
 693                  "Montage Technology %s successfully identified\n", chip_str);
 694
 695         memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops,
 696                         sizeof(struct dvb_tuner_ops));
 697         if (!pdata->attach_in_use)
 698                 fe->ops.tuner_ops.release = NULL;
 699
 700         i2c_set_clientdata(client, dev);
 701         return 0;
 702 err_regmap_exit:
 703         regmap_exit(dev->regmap);
 704 err_kfree:
 705         kfree(dev);
 706 err:
 707         dev_dbg(&client->dev, "failed=%d\n", ret);
 708         return ret;
 709 }
 710
 711 static int ts2020_remove(struct i2c_client *client)
 712 {
 713         struct ts2020_priv *dev = i2c_get_clientdata(client);
 714
 715         dev_dbg(&client->dev, "\n");
 716
 717         /* stop statistics polling */
 718         if (!dev->dont_poll)
 719                 cancel_delayed_work_sync(&dev->stat_work);
 720
 721         regmap_exit(dev->regmap);
 722         kfree(dev);
 723         return 0;
 724 }
 725
 726 static const struct i2c_device_id ts2020_id_table[] = {
 727         {"ts2020", 0},
 728         {"ts2022", 0},
 729         {}
 730 };
 731 MODULE_DEVICE_TABLE(i2c, ts2020_id_table);
 732
 733 static struct i2c_driver ts2020_driver = {
 734         .driver = {
 735                 .name   = "ts2020",
 736         },
 737         .probe          = ts2020_probe,
 738         .remove         = ts2020_remove,
 739         .id_table       = ts2020_id_table,
 740 };
 741
 742 module_i2c_driver(ts2020_driver);
 743
 744 MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
 745 MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
 746 MODULE_LICENSE("GPL");