root/drivers/media/dvb-frontends/ts2020.c

DEFINITIONS

1. ts2020_release
2. ts2020_sleep
3. ts2020_init
4. ts2020_tuner_gate_ctrl
5. ts2020_set_tuner_rf
6. ts2020_set_params
7. ts2020_get_frequency
8. ts2020_get_if_frequency
9. ts2020_read_tuner_gain
10. ts2020_get_tuner_gain
11. ts2020_stat_work
12. ts2020_read_signal_strength
13. ts2020_attach
14. ts2020_regmap_lock
15. ts2020_regmap_unlock
16. ts2020_probe
17. ts2020_remove

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     Montage Technology TS2020 - Silicon Tuner driver
   4     Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>
   5 
   6     Copyright (C) 2009-2012 TurboSight.com
   7 
   8  */
   9 
  10 #include <media/dvb_frontend.h>
  11 #include "ts2020.h"
  12 #include <linux/regmap.h>
  13 #include <linux/math64.h>
  14 
  15 #define TS2020_XTAL_FREQ   27000 /* in kHz */
  16 #define FREQ_OFFSET_LOW_SYM_RATE 3000
  17 
  18 struct ts2020_priv {
  19         struct i2c_client *client;
  20         struct mutex regmap_mutex;
  21         struct regmap_config regmap_config;
  22         struct regmap *regmap;
  23         struct dvb_frontend *fe;
  24         struct delayed_work stat_work;
  25         int (*get_agc_pwm)(struct dvb_frontend *fe, u8 *_agc_pwm);
  26         /* i2c details */
  27         struct i2c_adapter *i2c;
  28         int i2c_address;
  29         bool loop_through:1;
  30         u8 clk_out:2;
  31         u8 clk_out_div:5;
  32         bool dont_poll:1;
  33         u32 frequency_div; /* LO output divider switch frequency */
  34         u32 frequency_khz; /* actual used LO frequency */
  35 #define TS2020_M88TS2020 0
  36 #define TS2020_M88TS2022 1
  37         u8 tuner;
  38 };
  39 
  40 struct ts2020_reg_val {
  41         u8 reg;
  42         u8 val;
  43 };
  44 
  45 static void ts2020_stat_work(struct work_struct *work);
  46 
  47 static void ts2020_release(struct dvb_frontend *fe)
  48 {
  49         struct ts2020_priv *priv = fe->tuner_priv;
  50         struct i2c_client *client = priv->client;
  51 
  52         dev_dbg(&client->dev, "\n");
  53 
  54         i2c_unregister_device(client);
  55 }
  56 
  57 static int ts2020_sleep(struct dvb_frontend *fe)
  58 {
  59         struct ts2020_priv *priv = fe->tuner_priv;
  60         int ret;
  61         u8 u8tmp;
  62 
  63         if (priv->tuner == TS2020_M88TS2020)
  64                 u8tmp = 0x0a; /* XXX: probably wrong */
  65         else
  66                 u8tmp = 0x00;
  67 
  68         ret = regmap_write(priv->regmap, u8tmp, 0x00);
  69         if (ret < 0)
  70                 return ret;
  71 
  72         /* stop statistics polling */
  73         if (!priv->dont_poll)
  74                 cancel_delayed_work_sync(&priv->stat_work);
  75         return 0;
  76 }
  77 
  78 static int ts2020_init(struct dvb_frontend *fe)
  79 {
  80         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  81         struct ts2020_priv *priv = fe->tuner_priv;
  82         int i;
  83         u8 u8tmp;
  84 
  85         if (priv->tuner == TS2020_M88TS2020) {
  86                 regmap_write(priv->regmap, 0x42, 0x73);
  87                 regmap_write(priv->regmap, 0x05, priv->clk_out_div);
  88                 regmap_write(priv->regmap, 0x20, 0x27);
  89                 regmap_write(priv->regmap, 0x07, 0x02);
  90                 regmap_write(priv->regmap, 0x11, 0xff);
  91                 regmap_write(priv->regmap, 0x60, 0xf9);
  92                 regmap_write(priv->regmap, 0x08, 0x01);
  93                 regmap_write(priv->regmap, 0x00, 0x41);
  94         } else {
  95                 static const struct ts2020_reg_val reg_vals[] = {
  96                         {0x7d, 0x9d},
  97                         {0x7c, 0x9a},
  98                         {0x7a, 0x76},
  99                         {0x3b, 0x01},
 100                         {0x63, 0x88},
 101                         {0x61, 0x85},
 102                         {0x22, 0x30},
 103                         {0x30, 0x40},
 104                         {0x20, 0x23},
 105                         {0x24, 0x02},
 106                         {0x12, 0xa0},
 107                 };
 108 
 109                 regmap_write(priv->regmap, 0x00, 0x01);
 110                 regmap_write(priv->regmap, 0x00, 0x03);
 111 
 112                 switch (priv->clk_out) {
 113                 case TS2020_CLK_OUT_DISABLED:
 114                         u8tmp = 0x60;
 115                         break;
 116                 case TS2020_CLK_OUT_ENABLED:
 117                         u8tmp = 0x70;
 118                         regmap_write(priv->regmap, 0x05, priv->clk_out_div);
 119                         break;
 120                 case TS2020_CLK_OUT_ENABLED_XTALOUT:
 121                         u8tmp = 0x6c;
 122                         break;
 123                 default:
 124                         u8tmp = 0x60;
 125                         break;
 126                 }
 127 
 128                 regmap_write(priv->regmap, 0x42, u8tmp);
 129 
 130                 if (priv->loop_through)
 131                         u8tmp = 0xec;
 132                 else
 133                         u8tmp = 0x6c;
 134 
 135                 regmap_write(priv->regmap, 0x62, u8tmp);
 136 
 137                 for (i = 0; i < ARRAY_SIZE(reg_vals); i++)
 138                         regmap_write(priv->regmap, reg_vals[i].reg,
 139                                      reg_vals[i].val);
 140         }
 141 
 142         /* Initialise v5 stats here */
 143         c->strength.len = 1;
 144         c->strength.stat[0].scale = FE_SCALE_DECIBEL;
 145         c->strength.stat[0].uvalue = 0;
 146 
 147         /* Start statistics polling by invoking the work function */
 148         ts2020_stat_work(&priv->stat_work.work);
 149         return 0;
 150 }
 151 
 152 static int ts2020_tuner_gate_ctrl(struct dvb_frontend *fe, u8 offset)
 153 {
 154         struct ts2020_priv *priv = fe->tuner_priv;
 155         int ret;
 156         ret = regmap_write(priv->regmap, 0x51, 0x1f - offset);
 157         ret |= regmap_write(priv->regmap, 0x51, 0x1f);
 158         ret |= regmap_write(priv->regmap, 0x50, offset);
 159         ret |= regmap_write(priv->regmap, 0x50, 0x00);
 160         msleep(20);
 161         return ret;
 162 }
 163 
 164 static int ts2020_set_tuner_rf(struct dvb_frontend *fe)
 165 {
 166         struct ts2020_priv *dev = fe->tuner_priv;
 167         int ret;
 168         unsigned int utmp;
 169 
 170         ret = regmap_read(dev->regmap, 0x3d, &utmp);
 171         if (ret)
 172                 return ret;
 173 
 174         utmp &= 0x7f;
 175         if (utmp < 0x16)
 176                 utmp = 0xa1;
 177         else if (utmp == 0x16)
 178                 utmp = 0x99;
 179         else
 180                 utmp = 0xf9;
 181 
 182         regmap_write(dev->regmap, 0x60, utmp);
 183         ret = ts2020_tuner_gate_ctrl(fe, 0x08);
 184 
 185         return ret;
 186 }
 187 
 188 static int ts2020_set_params(struct dvb_frontend *fe)
 189 {
 190         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 191         struct ts2020_priv *priv = fe->tuner_priv;
 192         int ret;
 193         unsigned int utmp;
 194         u32 f3db, gdiv28;
 195         u16 u16tmp, value, lpf_coeff;
 196         u8 buf[3], reg10, lpf_mxdiv, mlpf_max, mlpf_min, nlpf;
 197         unsigned int f_ref_khz, f_vco_khz, div_ref, div_out, pll_n;
 198         unsigned int frequency_khz = c->frequency;
 199 
 200         /*
 201          * Integer-N PLL synthesizer
 202          * kHz is used for all calculations to keep calculations within 32-bit
 203          */
 204         f_ref_khz = TS2020_XTAL_FREQ;
 205         div_ref = DIV_ROUND_CLOSEST(f_ref_khz, 2000);
 206 
 207         /* select LO output divider */
 208         if (frequency_khz < priv->frequency_div) {
 209                 div_out = 4;
 210                 reg10 = 0x10;
 211         } else {
 212                 div_out = 2;
 213                 reg10 = 0x00;
 214         }
 215 
 216         f_vco_khz = frequency_khz * div_out;
 217         pll_n = f_vco_khz * div_ref / f_ref_khz;
 218         pll_n += pll_n % 2;
 219         priv->frequency_khz = pll_n * f_ref_khz / div_ref / div_out;
 220 
 221         pr_debug("frequency=%u offset=%d f_vco_khz=%u pll_n=%u div_ref=%u div_out=%u\n",
 222                  priv->frequency_khz, priv->frequency_khz - c->frequency,
 223                  f_vco_khz, pll_n, div_ref, div_out);
 224 
 225         if (priv->tuner == TS2020_M88TS2020) {
 226                 lpf_coeff = 2766;
 227                 reg10 |= 0x01;
 228                 ret = regmap_write(priv->regmap, 0x10, reg10);
 229         } else {
 230                 lpf_coeff = 3200;
 231                 reg10 |= 0x0b;
 232                 ret = regmap_write(priv->regmap, 0x10, reg10);
 233                 ret |= regmap_write(priv->regmap, 0x11, 0x40);
 234         }
 235 
 236         u16tmp = pll_n - 1024;
 237         buf[0] = (u16tmp >> 8) & 0xff;
 238         buf[1] = (u16tmp >> 0) & 0xff;
 239         buf[2] = div_ref - 8;
 240 
 241         ret |= regmap_write(priv->regmap, 0x01, buf[0]);
 242         ret |= regmap_write(priv->regmap, 0x02, buf[1]);
 243         ret |= regmap_write(priv->regmap, 0x03, buf[2]);
 244 
 245         ret |= ts2020_tuner_gate_ctrl(fe, 0x10);
 246         if (ret < 0)
 247                 return -ENODEV;
 248 
 249         ret |= ts2020_tuner_gate_ctrl(fe, 0x08);
 250 
 251         /* Tuner RF */
 252         if (priv->tuner == TS2020_M88TS2020)
 253                 ret |= ts2020_set_tuner_rf(fe);
 254 
 255         gdiv28 = (TS2020_XTAL_FREQ / 1000 * 1694 + 500) / 1000;
 256         ret |= regmap_write(priv->regmap, 0x04, gdiv28 & 0xff);
 257         ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
 258         if (ret < 0)
 259                 return -ENODEV;
 260 
 261         if (priv->tuner == TS2020_M88TS2022) {
 262                 ret = regmap_write(priv->regmap, 0x25, 0x00);
 263                 ret |= regmap_write(priv->regmap, 0x27, 0x70);
 264                 ret |= regmap_write(priv->regmap, 0x41, 0x09);
 265                 ret |= regmap_write(priv->regmap, 0x08, 0x0b);
 266                 if (ret < 0)
 267                         return -ENODEV;
 268         }
 269 
 270         regmap_read(priv->regmap, 0x26, &utmp);
 271         value = utmp;
 272 
 273         f3db = (c->bandwidth_hz / 1000 / 2) + 2000;
 274         f3db += FREQ_OFFSET_LOW_SYM_RATE; /* FIXME: ~always too wide filter */
 275         f3db = clamp(f3db, 7000U, 40000U);
 276 
 277         gdiv28 = gdiv28 * 207 / (value * 2 + 151);
 278         mlpf_max = gdiv28 * 135 / 100;
 279         mlpf_min = gdiv28 * 78 / 100;
 280         if (mlpf_max > 63)
 281                 mlpf_max = 63;
 282 
 283         nlpf = (f3db * gdiv28 * 2 / lpf_coeff /
 284                 (TS2020_XTAL_FREQ / 1000)  + 1) / 2;
 285         if (nlpf > 23)
 286                 nlpf = 23;
 287         if (nlpf < 1)
 288                 nlpf = 1;
 289 
 290         lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 291                 * lpf_coeff * 2  / f3db + 1) / 2;
 292 
 293         if (lpf_mxdiv < mlpf_min) {
 294                 nlpf++;
 295                 lpf_mxdiv = (nlpf * (TS2020_XTAL_FREQ / 1000)
 296                         * lpf_coeff * 2  / f3db + 1) / 2;
 297         }
 298 
 299         if (lpf_mxdiv > mlpf_max)
 300                 lpf_mxdiv = mlpf_max;
 301 
 302         ret = regmap_write(priv->regmap, 0x04, lpf_mxdiv);
 303         ret |= regmap_write(priv->regmap, 0x06, nlpf);
 304 
 305         ret |= ts2020_tuner_gate_ctrl(fe, 0x04);
 306 
 307         ret |= ts2020_tuner_gate_ctrl(fe, 0x01);
 308 
 309         msleep(80);
 310 
 311         return (ret < 0) ? -EINVAL : 0;
 312 }
 313 
 314 static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 315 {
 316         struct ts2020_priv *priv = fe->tuner_priv;
 317 
 318         *frequency = priv->frequency_khz;
 319         return 0;
 320 }
 321 
 322 static int ts2020_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 323 {
 324         *frequency = 0; /* Zero-IF */
 325         return 0;
 326 }
 327 
 328 /*
 329  * Get the tuner gain.
 330  * @fe: The front end for which we're determining the gain
 331  * @v_agc: The voltage of the AGC from the demodulator (0-2600mV)
 332  * @_gain: Where to store the gain (in 0.001dB units)
 333  *
 334  * Returns 0 or a negative error code.
 335  */
 336 static int ts2020_read_tuner_gain(struct dvb_frontend *fe, unsigned v_agc,
 337                                   __s64 *_gain)
 338 {
 339         struct ts2020_priv *priv = fe->tuner_priv;
 340         unsigned long gain1, gain2, gain3;
 341         unsigned utmp;
 342         int ret;
 343 
 344         /* Read the RF gain */
 345         ret = regmap_read(priv->regmap, 0x3d, &utmp);
 346         if (ret < 0)
 347                 return ret;
 348         gain1 = utmp & 0x1f;
 349 
 350         /* Read the baseband gain */
 351         ret = regmap_read(priv->regmap, 0x21, &utmp);
 352         if (ret < 0)
 353                 return ret;
 354         gain2 = utmp & 0x1f;
 355 
 356         switch (priv->tuner) {
 357         case TS2020_M88TS2020:
 358                 gain1 = clamp_t(long, gain1, 0, 15);
 359                 gain2 = clamp_t(long, gain2, 0, 13);
 360                 v_agc = clamp_t(long, v_agc, 400, 1100);
 361 
 362                 *_gain = -((__s64)gain1 * 2330 +
 363                            gain2 * 3500 +
 364                            v_agc * 24 / 10 * 10 +
 365                            10000);
 366                 /* gain in range -19600 to -116850 in units of 0.001dB */
 367                 break;
 368 
 369         case TS2020_M88TS2022:
 370                 ret = regmap_read(priv->regmap, 0x66, &utmp);
 371                 if (ret < 0)
 372                         return ret;
 373                 gain3 = (utmp >> 3) & 0x07;
 374 
 375                 gain1 = clamp_t(long, gain1, 0, 15);
 376                 gain2 = clamp_t(long, gain2, 2, 16);
 377                 gain3 = clamp_t(long, gain3, 0, 6);
 378                 v_agc = clamp_t(long, v_agc, 600, 1600);
 379 
 380                 *_gain = -((__s64)gain1 * 2650 +
 381                            gain2 * 3380 +
 382                            gain3 * 2850 +
 383                            v_agc * 176 / 100 * 10 -
 384                            30000);
 385                 /* gain in range -47320 to -158950 in units of 0.001dB */
 386                 break;
 387         }
 388 
 389         return 0;
 390 }
 391 
 392 /*
 393  * Get the AGC information from the demodulator and use that to calculate the
 394  * tuner gain.
 395  */
 396 static int ts2020_get_tuner_gain(struct dvb_frontend *fe, __s64 *_gain)
 397 {
 398         struct ts2020_priv *priv = fe->tuner_priv;
 399         int v_agc = 0, ret;
 400         u8 agc_pwm;
 401 
 402         /* Read the AGC PWM rate from the demodulator */
 403         if (priv->get_agc_pwm) {
 404                 ret = priv->get_agc_pwm(fe, &agc_pwm);
 405                 if (ret < 0)
 406                         return ret;
 407 
 408                 switch (priv->tuner) {
 409                 case TS2020_M88TS2020:
 410                         v_agc = (int)agc_pwm * 20 - 1166;
 411                         break;
 412                 case TS2020_M88TS2022:
 413                         v_agc = (int)agc_pwm * 16 - 670;
 414                         break;
 415                 }
 416 
 417                 if (v_agc < 0)
 418                         v_agc = 0;
 419         }
 420 
 421         return ts2020_read_tuner_gain(fe, v_agc, _gain);
 422 }
 423 
 424 /*
 425  * Gather statistics on a regular basis
 426  */
 427 static void ts2020_stat_work(struct work_struct *work)
 428 {
 429         struct ts2020_priv *priv = container_of(work, struct ts2020_priv,
 430                                                stat_work.work);
 431         struct i2c_client *client = priv->client;
 432         struct dtv_frontend_properties *c = &priv->fe->dtv_property_cache;
 433         int ret;
 434 
 435         dev_dbg(&client->dev, "\n");
 436 
 437         ret = ts2020_get_tuner_gain(priv->fe, &c->strength.stat[0].svalue);
 438         if (ret < 0)
 439                 goto err;
 440 
 441         c->strength.stat[0].scale = FE_SCALE_DECIBEL;
 442 
 443         if (!priv->dont_poll)
 444                 schedule_delayed_work(&priv->stat_work, msecs_to_jiffies(2000));
 445         return;
 446 err:
 447         dev_dbg(&client->dev, "failed=%d\n", ret);
 448 }
 449 
 450 /*
 451  * Read TS2020 signal strength in v3 format.
 452  */
 453 static int ts2020_read_signal_strength(struct dvb_frontend *fe,
 454                                        u16 *_signal_strength)
 455 {
 456         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 457         struct ts2020_priv *priv = fe->tuner_priv;
 458         unsigned strength;
 459         __s64 gain;
 460 
 461         if (priv->dont_poll)
 462                 ts2020_stat_work(&priv->stat_work.work);
 463 
 464         if (c->strength.stat[0].scale == FE_SCALE_NOT_AVAILABLE) {
 465                 *_signal_strength = 0;
 466                 return 0;
 467         }
 468 
 469         gain = c->strength.stat[0].svalue;
 470 
 471         /* Calculate the signal strength based on the total gain of the tuner */
 472         if (gain < -85000)
 473                 /* 0%: no signal or weak signal */
 474                 strength = 0;
 475         else if (gain < -65000)
 476                 /* 0% - 60%: weak signal */
 477                 strength = 0 + div64_s64((85000 + gain) * 3, 1000);
 478         else if (gain < -45000)
 479                 /* 60% - 90%: normal signal */
 480                 strength = 60 + div64_s64((65000 + gain) * 3, 2000);
 481         else
 482                 /* 90% - 99%: strong signal */
 483                 strength = 90 + div64_s64((45000 + gain), 5000);
 484 
 485         *_signal_strength = strength * 65535 / 100;
 486         return 0;
 487 }
 488 
 489 static const struct dvb_tuner_ops ts2020_tuner_ops = {
 490         .info = {
 491                 .name = "TS2020",
 492                 .frequency_min_hz =  950 * MHz,
 493                 .frequency_max_hz = 2150 * MHz
 494         },
 495         .init = ts2020_init,
 496         .release = ts2020_release,
 497         .sleep = ts2020_sleep,
 498         .set_params = ts2020_set_params,
 499         .get_frequency = ts2020_get_frequency,
 500         .get_if_frequency = ts2020_get_if_frequency,
 501         .get_rf_strength = ts2020_read_signal_strength,
 502 };
 503 
 504 struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
 505                                         const struct ts2020_config *config,
 506                                         struct i2c_adapter *i2c)
 507 {
 508         struct i2c_client *client;
 509         struct i2c_board_info board_info;
 510 
 511         /* This is only used by ts2020_probe() so can be on the stack */
 512         struct ts2020_config pdata;
 513 
 514         memcpy(&pdata, config, sizeof(pdata));
 515         pdata.fe = fe;
 516         pdata.attach_in_use = true;
 517 
 518         memset(&board_info, 0, sizeof(board_info));
 519         strscpy(board_info.type, "ts2020", I2C_NAME_SIZE);
 520         board_info.addr = config->tuner_address;
 521         board_info.platform_data = &pdata;
 522         client = i2c_new_device(i2c, &board_info);
 523         if (!client || !client->dev.driver)
 524                 return NULL;
 525 
 526         return fe;
 527 }
 528 EXPORT_SYMBOL(ts2020_attach);
 529 
 530 /*
 531  * We implement own regmap locking due to legacy DVB attach which uses frontend
 532  * gate control callback to control I2C bus access. We can open / close gate and
 533  * serialize whole open / I2C-operation / close sequence at the same.
 534  */
 535 static void ts2020_regmap_lock(void *__dev)
 536 {
 537         struct ts2020_priv *dev = __dev;
 538 
 539         mutex_lock(&dev->regmap_mutex);
 540         if (dev->fe->ops.i2c_gate_ctrl)
 541                 dev->fe->ops.i2c_gate_ctrl(dev->fe, 1);
 542 }
 543 
 544 static void ts2020_regmap_unlock(void *__dev)
 545 {
 546         struct ts2020_priv *dev = __dev;
 547 
 548         if (dev->fe->ops.i2c_gate_ctrl)
 549                 dev->fe->ops.i2c_gate_ctrl(dev->fe, 0);
 550         mutex_unlock(&dev->regmap_mutex);
 551 }
 552 
 553 static int ts2020_probe(struct i2c_client *client,
 554                 const struct i2c_device_id *id)
 555 {
 556         struct ts2020_config *pdata = client->dev.platform_data;
 557         struct dvb_frontend *fe = pdata->fe;
 558         struct ts2020_priv *dev;
 559         int ret;
 560         u8 u8tmp;
 561         unsigned int utmp;
 562         char *chip_str;
 563 
 564         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 565         if (!dev) {
 566                 ret = -ENOMEM;
 567                 goto err;
 568         }
 569 
 570         /* create regmap */
 571         mutex_init(&dev->regmap_mutex);
 572         dev->regmap_config.reg_bits = 8,
 573         dev->regmap_config.val_bits = 8,
 574         dev->regmap_config.lock = ts2020_regmap_lock,
 575         dev->regmap_config.unlock = ts2020_regmap_unlock,
 576         dev->regmap_config.lock_arg = dev,
 577         dev->regmap = regmap_init_i2c(client, &dev->regmap_config);
 578         if (IS_ERR(dev->regmap)) {
 579                 ret = PTR_ERR(dev->regmap);
 580                 goto err_kfree;
 581         }
 582 
 583         dev->i2c = client->adapter;
 584         dev->i2c_address = client->addr;
 585         dev->loop_through = pdata->loop_through;
 586         dev->clk_out = pdata->clk_out;
 587         dev->clk_out_div = pdata->clk_out_div;
 588         dev->dont_poll = pdata->dont_poll;
 589         dev->frequency_div = pdata->frequency_div;
 590         dev->fe = fe;
 591         dev->get_agc_pwm = pdata->get_agc_pwm;
 592         fe->tuner_priv = dev;
 593         dev->client = client;
 594         INIT_DELAYED_WORK(&dev->stat_work, ts2020_stat_work);
 595 
 596         /* check if the tuner is there */
 597         ret = regmap_read(dev->regmap, 0x00, &utmp);
 598         if (ret)
 599                 goto err_regmap_exit;
 600 
 601         if ((utmp & 0x03) == 0x00) {
 602                 ret = regmap_write(dev->regmap, 0x00, 0x01);
 603                 if (ret)
 604                         goto err_regmap_exit;
 605 
 606                 usleep_range(2000, 50000);
 607         }
 608 
 609         ret = regmap_write(dev->regmap, 0x00, 0x03);
 610         if (ret)
 611                 goto err_regmap_exit;
 612 
 613         usleep_range(2000, 50000);
 614 
 615         ret = regmap_read(dev->regmap, 0x00, &utmp);
 616         if (ret)
 617                 goto err_regmap_exit;
 618 
 619         dev_dbg(&client->dev, "chip_id=%02x\n", utmp);
 620 
 621         switch (utmp) {
 622         case 0x01:
 623         case 0x41:
 624         case 0x81:
 625                 dev->tuner = TS2020_M88TS2020;
 626                 chip_str = "TS2020";
 627                 if (!dev->frequency_div)
 628                         dev->frequency_div = 1060000;
 629                 break;
 630         case 0xc3:
 631         case 0x83:
 632                 dev->tuner = TS2020_M88TS2022;
 633                 chip_str = "TS2022";
 634                 if (!dev->frequency_div)
 635                         dev->frequency_div = 1103000;
 636                 break;
 637         default:
 638                 ret = -ENODEV;
 639                 goto err_regmap_exit;
 640         }
 641 
 642         if (dev->tuner == TS2020_M88TS2022) {
 643                 switch (dev->clk_out) {
 644                 case TS2020_CLK_OUT_DISABLED:
 645                         u8tmp = 0x60;
 646                         break;
 647                 case TS2020_CLK_OUT_ENABLED:
 648                         u8tmp = 0x70;
 649                         ret = regmap_write(dev->regmap, 0x05, dev->clk_out_div);
 650                         if (ret)
 651                                 goto err_regmap_exit;
 652                         break;
 653                 case TS2020_CLK_OUT_ENABLED_XTALOUT:
 654                         u8tmp = 0x6c;
 655                         break;
 656                 default:
 657                         ret = -EINVAL;
 658                         goto err_regmap_exit;
 659                 }
 660 
 661                 ret = regmap_write(dev->regmap, 0x42, u8tmp);
 662                 if (ret)
 663                         goto err_regmap_exit;
 664 
 665                 if (dev->loop_through)
 666                         u8tmp = 0xec;
 667                 else
 668                         u8tmp = 0x6c;
 669 
 670                 ret = regmap_write(dev->regmap, 0x62, u8tmp);
 671                 if (ret)
 672                         goto err_regmap_exit;
 673         }
 674 
 675         /* sleep */
 676         ret = regmap_write(dev->regmap, 0x00, 0x00);
 677         if (ret)
 678                 goto err_regmap_exit;
 679 
 680         dev_info(&client->dev,
 681                  "Montage Technology %s successfully identified\n", chip_str);
 682 
 683         memcpy(&fe->ops.tuner_ops, &ts2020_tuner_ops,
 684                         sizeof(struct dvb_tuner_ops));
 685         if (!pdata->attach_in_use)
 686                 fe->ops.tuner_ops.release = NULL;
 687 
 688         i2c_set_clientdata(client, dev);
 689         return 0;
 690 err_regmap_exit:
 691         regmap_exit(dev->regmap);
 692 err_kfree:
 693         kfree(dev);
 694 err:
 695         dev_dbg(&client->dev, "failed=%d\n", ret);
 696         return ret;
 697 }
 698 
 699 static int ts2020_remove(struct i2c_client *client)
 700 {
 701         struct ts2020_priv *dev = i2c_get_clientdata(client);
 702 
 703         dev_dbg(&client->dev, "\n");
 704 
 705         /* stop statistics polling */
 706         if (!dev->dont_poll)
 707                 cancel_delayed_work_sync(&dev->stat_work);
 708 
 709         regmap_exit(dev->regmap);
 710         kfree(dev);
 711         return 0;
 712 }
 713 
 714 static const struct i2c_device_id ts2020_id_table[] = {
 715         {"ts2020", 0},
 716         {"ts2022", 0},
 717         {}
 718 };
 719 MODULE_DEVICE_TABLE(i2c, ts2020_id_table);
 720 
 721 static struct i2c_driver ts2020_driver = {
 722         .driver = {
 723                 .name   = "ts2020",
 724         },
 725         .probe          = ts2020_probe,
 726         .remove         = ts2020_remove,
 727         .id_table       = ts2020_id_table,
 728 };
 729 
 730 module_i2c_driver(ts2020_driver);
 731 
 732 MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
 733 MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
 734 MODULE_LICENSE("GPL");