drivers/media/dvb/frontends/cxd2820r_core.c

   1 /*
   2  * Sony CXD2820R demodulator driver
   3  *
   4  * Copyright (C) 2010 Antti Palosaari <crope@iki.fi>
   5  *
   6  *    This program is free software; you can redistribute it and/or modify
   7  *    it under the terms of the GNU General Public License as published by
   8  *    the Free Software Foundation; either version 2 of the License, or
   9  *    (at your option) any later version.
  10  *
  11  *    This program is distributed in the hope that it will be useful,
  12  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *    GNU General Public License for more details.
  15  *
  16  *    You should have received a copy of the GNU General Public License along
  17  *    with this program; if not, write to the Free Software Foundation, Inc.,
  18  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21
  22 #include "cxd2820r_priv.h"
  23
  24 int cxd2820r_debug;
  25 module_param_named(debug, cxd2820r_debug, int, 0644);
  26 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
  27
  28 /* write multiple registers */
  29 static int cxd2820r_wr_regs_i2c(struct cxd2820r_priv *priv, u8 i2c, u8 reg,
  30         u8 *val, int len)
  31 {
  32         int ret;
  33         u8 buf[len+1];
  34         struct i2c_msg msg[1] = {
  35                 {
  36                         .addr = i2c,
  37                         .flags = 0,
  38                         .len = sizeof(buf),
  39                         .buf = buf,
  40                 }
  41         };
  42
  43         buf[0] = reg;
  44         memcpy(&buf[1], val, len);
  45
  46         ret = i2c_transfer(priv->i2c, msg, 1);
  47         if (ret == 1) {
  48                 ret = 0;
  49         } else {
  50                 warn("i2c wr failed ret:%d reg:%02x len:%d", ret, reg, len);
  51                 ret = -EREMOTEIO;
  52         }
  53         return ret;
  54 }
  55
  56 /* read multiple registers */
  57 static int cxd2820r_rd_regs_i2c(struct cxd2820r_priv *priv, u8 i2c, u8 reg,
  58         u8 *val, int len)
  59 {
  60         int ret;
  61         u8 buf[len];
  62         struct i2c_msg msg[2] = {
  63                 {
  64                         .addr = i2c,
  65                         .flags = 0,
  66                         .len = 1,
  67                         .buf = &reg,
  68                 }, {
  69                         .addr = i2c,
  70                         .flags = I2C_M_RD,
  71                         .len = sizeof(buf),
  72                         .buf = buf,
  73                 }
  74         };
  75
  76         ret = i2c_transfer(priv->i2c, msg, 2);
  77         if (ret == 2) {
  78                 memcpy(val, buf, len);
  79                 ret = 0;
  80         } else {
  81                 warn("i2c rd failed ret:%d reg:%02x len:%d", ret, reg, len);
  82                 ret = -EREMOTEIO;
  83         }
  84
  85         return ret;
  86 }
  87
  88 /* write multiple registers */
  89 int cxd2820r_wr_regs(struct cxd2820r_priv *priv, u32 reginfo, u8 *val,
  90         int len)
  91 {
  92         int ret;
  93         u8 i2c_addr;
  94         u8 reg = (reginfo >> 0) & 0xff;
  95         u8 bank = (reginfo >> 8) & 0xff;
  96         u8 i2c = (reginfo >> 16) & 0x01;
  97
  98         /* select I2C */
  99         if (i2c)
 100                 i2c_addr = priv->cfg.i2c_address | (1 << 1); /* DVB-C */
 101         else
 102                 i2c_addr = priv->cfg.i2c_address; /* DVB-T/T2 */
 103
 104         /* switch bank if needed */
 105         if (bank != priv->bank[i2c]) {
 106                 ret = cxd2820r_wr_regs_i2c(priv, i2c_addr, 0x00, &bank, 1);
 107                 if (ret)
 108                         return ret;
 109                 priv->bank[i2c] = bank;
 110         }
 111         return cxd2820r_wr_regs_i2c(priv, i2c_addr, reg, val, len);
 112 }
 113
 114 /* read multiple registers */
 115 int cxd2820r_rd_regs(struct cxd2820r_priv *priv, u32 reginfo, u8 *val,
 116         int len)
 117 {
 118         int ret;
 119         u8 i2c_addr;
 120         u8 reg = (reginfo >> 0) & 0xff;
 121         u8 bank = (reginfo >> 8) & 0xff;
 122         u8 i2c = (reginfo >> 16) & 0x01;
 123
 124         /* select I2C */
 125         if (i2c)
 126                 i2c_addr = priv->cfg.i2c_address | (1 << 1); /* DVB-C */
 127         else
 128                 i2c_addr = priv->cfg.i2c_address; /* DVB-T/T2 */
 129
 130         /* switch bank if needed */
 131         if (bank != priv->bank[i2c]) {
 132                 ret = cxd2820r_wr_regs_i2c(priv, i2c_addr, 0x00, &bank, 1);
 133                 if (ret)
 134                         return ret;
 135                 priv->bank[i2c] = bank;
 136         }
 137         return cxd2820r_rd_regs_i2c(priv, i2c_addr, reg, val, len);
 138 }
 139
 140 /* write single register */
 141 int cxd2820r_wr_reg(struct cxd2820r_priv *priv, u32 reg, u8 val)
 142 {
 143         return cxd2820r_wr_regs(priv, reg, &val, 1);
 144 }
 145
 146 /* read single register */
 147 int cxd2820r_rd_reg(struct cxd2820r_priv *priv, u32 reg, u8 *val)
 148 {
 149         return cxd2820r_rd_regs(priv, reg, val, 1);
 150 }
 151
 152 /* write single register with mask */
 153 int cxd2820r_wr_reg_mask(struct cxd2820r_priv *priv, u32 reg, u8 val,
 154         u8 mask)
 155 {
 156         int ret;
 157         u8 tmp;
 158
 159         /* no need for read if whole reg is written */
 160         if (mask != 0xff) {
 161                 ret = cxd2820r_rd_reg(priv, reg, &tmp);
 162                 if (ret)
 163                         return ret;
 164
 165                 val &= mask;
 166                 tmp &= ~mask;
 167                 val |= tmp;
 168         }
 169
 170         return cxd2820r_wr_reg(priv, reg, val);
 171 }
 172
 173 int cxd2820r_gpio(struct dvb_frontend *fe)
 174 {
 175         struct cxd2820r_priv *priv = fe->demodulator_priv;
 176         int ret, i;
 177         u8 *gpio, tmp0, tmp1;
 178         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 179
 180         switch (fe->dtv_property_cache.delivery_system) {
 181         case SYS_DVBT:
 182                 gpio = priv->cfg.gpio_dvbt;
 183                 break;
 184         case SYS_DVBT2:
 185                 gpio = priv->cfg.gpio_dvbt2;
 186                 break;
 187         case SYS_DVBC_ANNEX_AC:
 188                 gpio = priv->cfg.gpio_dvbc;
 189                 break;
 190         default:
 191                 ret = -EINVAL;
 192                 goto error;
 193         }
 194
 195         /* update GPIOs only when needed */
 196         if (!memcmp(gpio, priv->gpio, sizeof(priv->gpio)))
 197                 return 0;
 198
 199         tmp0 = 0x00;
 200         tmp1 = 0x00;
 201         for (i = 0; i < sizeof(priv->gpio); i++) {
 202                 /* enable / disable */
 203                 if (gpio[i] & CXD2820R_GPIO_E)
 204                         tmp0 |= (2 << 6) >> (2 * i);
 205                 else
 206                         tmp0 |= (1 << 6) >> (2 * i);
 207
 208                 /* input / output */
 209                 if (gpio[i] & CXD2820R_GPIO_I)
 210                         tmp1 |= (1 << (3 + i));
 211                 else
 212                         tmp1 |= (0 << (3 + i));
 213
 214                 /* high / low */
 215                 if (gpio[i] & CXD2820R_GPIO_H)
 216                         tmp1 |= (1 << (0 + i));
 217                 else
 218                         tmp1 |= (0 << (0 + i));
 219
 220                 dbg("%s: GPIO i=%d %02x %02x", __func__, i, tmp0, tmp1);
 221         }
 222
 223         dbg("%s: wr gpio=%02x %02x", __func__, tmp0, tmp1);
 224
 225         /* write bits [7:2] */
 226         ret = cxd2820r_wr_reg_mask(priv, 0x00089, tmp0, 0xfc);
 227         if (ret)
 228                 goto error;
 229
 230         /* write bits [5:0] */
 231         ret = cxd2820r_wr_reg_mask(priv, 0x0008e, tmp1, 0x3f);
 232         if (ret)
 233                 goto error;
 234
 235         memcpy(priv->gpio, gpio, sizeof(priv->gpio));
 236
 237         return ret;
 238 error:
 239         dbg("%s: failed:%d", __func__, ret);
 240         return ret;
 241 }
 242
 243 /* 64 bit div with round closest, like DIV_ROUND_CLOSEST but 64 bit */
 244 u32 cxd2820r_div_u64_round_closest(u64 dividend, u32 divisor)
 245 {
 246         return div_u64(dividend + (divisor / 2), divisor);
 247 }
 248
 249 static int cxd2820r_set_frontend(struct dvb_frontend *fe)
 250 {
 251         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 252         int ret;
 253
 254         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 255         switch (c->delivery_system) {
 256         case SYS_DVBT:
 257                 ret = cxd2820r_init_t(fe);
 258                 if (ret < 0)
 259                         goto err;
 260                 ret = cxd2820r_set_frontend_t(fe);
 261                 if (ret < 0)
 262                         goto err;
 263                 break;
 264         case SYS_DVBT2:
 265                 ret = cxd2820r_init_t(fe);
 266                 if (ret < 0)
 267                         goto err;
 268                 ret = cxd2820r_set_frontend_t2(fe);
 269                 if (ret < 0)
 270                         goto err;
 271                 break;
 272         case SYS_DVBC_ANNEX_A:
 273                 ret = cxd2820r_init_c(fe);
 274                 if (ret < 0)
 275                         goto err;
 276                 ret = cxd2820r_set_frontend_c(fe);
 277                 if (ret < 0)
 278                         goto err;
 279                 break;
 280         default:
 281                 dbg("%s: error state=%d", __func__, fe->dtv_property_cache.delivery_system);
 282                 ret = -EINVAL;
 283                 break;
 284         }
 285 err:
 286         return ret;
 287 }
 288 static int cxd2820r_read_status(struct dvb_frontend *fe, fe_status_t *status)
 289 {
 290         int ret;
 291
 292         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 293         switch (fe->dtv_property_cache.delivery_system) {
 294         case SYS_DVBT:
 295                 ret = cxd2820r_read_status_t(fe, status);
 296                 break;
 297         case SYS_DVBT2:
 298                 ret = cxd2820r_read_status_t2(fe, status);
 299                 break;
 300         case SYS_DVBC_ANNEX_A:
 301                 ret = cxd2820r_read_status_c(fe, status);
 302                 break;
 303         default:
 304                 ret = -EINVAL;
 305                 break;
 306         }
 307         return ret;
 308 }
 309
 310 static int cxd2820r_get_frontend(struct dvb_frontend *fe)
 311 {
 312         int ret;
 313
 314         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 315         switch (fe->dtv_property_cache.delivery_system) {
 316         case SYS_DVBT:
 317                 ret = cxd2820r_get_frontend_t(fe);
 318                 break;
 319         case SYS_DVBT2:
 320                 ret = cxd2820r_get_frontend_t2(fe);
 321                 break;
 322         case SYS_DVBC_ANNEX_A:
 323                 ret = cxd2820r_get_frontend_c(fe);
 324                 break;
 325         default:
 326                 ret = -EINVAL;
 327                 break;
 328         }
 329         return ret;
 330 }
 331
 332 static int cxd2820r_read_ber(struct dvb_frontend *fe, u32 *ber)
 333 {
 334         int ret;
 335
 336         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 337         switch (fe->dtv_property_cache.delivery_system) {
 338         case SYS_DVBT:
 339                 ret = cxd2820r_read_ber_t(fe, ber);
 340                 break;
 341         case SYS_DVBT2:
 342                 ret = cxd2820r_read_ber_t2(fe, ber);
 343                 break;
 344         case SYS_DVBC_ANNEX_A:
 345                 ret = cxd2820r_read_ber_c(fe, ber);
 346                 break;
 347         default:
 348                 ret = -EINVAL;
 349                 break;
 350         }
 351         return ret;
 352 }
 353
 354 static int cxd2820r_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 355 {
 356         int ret;
 357
 358         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 359         switch (fe->dtv_property_cache.delivery_system) {
 360         case SYS_DVBT:
 361                 ret = cxd2820r_read_signal_strength_t(fe, strength);
 362                 break;
 363         case SYS_DVBT2:
 364                 ret = cxd2820r_read_signal_strength_t2(fe, strength);
 365                 break;
 366         case SYS_DVBC_ANNEX_A:
 367                 ret = cxd2820r_read_signal_strength_c(fe, strength);
 368                 break;
 369         default:
 370                 ret = -EINVAL;
 371                 break;
 372         }
 373         return ret;
 374 }
 375
 376 static int cxd2820r_read_snr(struct dvb_frontend *fe, u16 *snr)
 377 {
 378         int ret;
 379
 380         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 381         switch (fe->dtv_property_cache.delivery_system) {
 382         case SYS_DVBT:
 383                 ret = cxd2820r_read_snr_t(fe, snr);
 384                 break;
 385         case SYS_DVBT2:
 386                 ret = cxd2820r_read_snr_t2(fe, snr);
 387                 break;
 388         case SYS_DVBC_ANNEX_A:
 389                 ret = cxd2820r_read_snr_c(fe, snr);
 390                 break;
 391         default:
 392                 ret = -EINVAL;
 393                 break;
 394         }
 395         return ret;
 396 }
 397
 398 static int cxd2820r_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 399 {
 400         int ret;
 401
 402         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 403         switch (fe->dtv_property_cache.delivery_system) {
 404         case SYS_DVBT:
 405                 ret = cxd2820r_read_ucblocks_t(fe, ucblocks);
 406                 break;
 407         case SYS_DVBT2:
 408                 ret = cxd2820r_read_ucblocks_t2(fe, ucblocks);
 409                 break;
 410         case SYS_DVBC_ANNEX_A:
 411                 ret = cxd2820r_read_ucblocks_c(fe, ucblocks);
 412                 break;
 413         default:
 414                 ret = -EINVAL;
 415                 break;
 416         }
 417         return ret;
 418 }
 419
 420 static int cxd2820r_init(struct dvb_frontend *fe)
 421 {
 422         return 0;
 423 }
 424
 425 static int cxd2820r_sleep(struct dvb_frontend *fe)
 426 {
 427         int ret;
 428
 429         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 430         switch (fe->dtv_property_cache.delivery_system) {
 431         case SYS_DVBT:
 432                 ret = cxd2820r_sleep_t(fe);
 433                 break;
 434         case SYS_DVBT2:
 435                 ret = cxd2820r_sleep_t2(fe);
 436                 break;
 437         case SYS_DVBC_ANNEX_A:
 438                 ret = cxd2820r_sleep_c(fe);
 439                 break;
 440         default:
 441                 ret = -EINVAL;
 442                 break;
 443         }
 444         return ret;
 445 }
 446
 447 static int cxd2820r_get_tune_settings(struct dvb_frontend *fe,
 448                                       struct dvb_frontend_tune_settings *s)
 449 {
 450         int ret;
 451
 452         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 453         switch (fe->dtv_property_cache.delivery_system) {
 454         case SYS_DVBT:
 455                 ret = cxd2820r_get_tune_settings_t(fe, s);
 456                 break;
 457         case SYS_DVBT2:
 458                 ret = cxd2820r_get_tune_settings_t2(fe, s);
 459                 break;
 460         case SYS_DVBC_ANNEX_A:
 461                 ret = cxd2820r_get_tune_settings_c(fe, s);
 462                 break;
 463         default:
 464                 ret = -EINVAL;
 465                 break;
 466         }
 467         return ret;
 468 }
 469
 470 static enum dvbfe_search cxd2820r_search(struct dvb_frontend *fe)
 471 {
 472         struct cxd2820r_priv *priv = fe->demodulator_priv;
 473         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 474         int ret, i;
 475         fe_status_t status = 0;
 476         dbg("%s: delsys=%d", __func__, fe->dtv_property_cache.delivery_system);
 477
 478         /* switch between DVB-T and DVB-T2 when tune fails */
 479         if (priv->last_tune_failed && (priv->delivery_system != SYS_DVBC_ANNEX_A)) {
 480                 if (priv->delivery_system == SYS_DVBT)
 481                         c->delivery_system = SYS_DVBT2;
 482                 else
 483                         c->delivery_system = SYS_DVBT;
 484         }
 485
 486         /* set frontend */
 487         ret = cxd2820r_set_frontend(fe);
 488         if (ret)
 489                 goto error;
 490
 491
 492         /* frontend lock wait loop count */
 493         switch (priv->delivery_system) {
 494         case SYS_DVBT:
 495                 i = 20;
 496                 break;
 497         case SYS_DVBT2:
 498                 i = 40;
 499                 break;
 500         case SYS_UNDEFINED:
 501         default:
 502                 i = 0;
 503                 break;
 504         }
 505
 506         /* wait frontend lock */
 507         for (; i > 0; i--) {
 508                 dbg("%s: LOOP=%d", __func__, i);
 509                 msleep(50);
 510                 ret = cxd2820r_read_status(fe, &status);
 511                 if (ret)
 512                         goto error;
 513
 514                 if (status & FE_HAS_SIGNAL)
 515                         break;
 516         }
 517
 518         /* check if we have a valid signal */
 519         if (status) {
 520                 priv->last_tune_failed = 0;
 521                 return DVBFE_ALGO_SEARCH_SUCCESS;
 522         } else {
 523                 priv->last_tune_failed = 1;
 524                 return DVBFE_ALGO_SEARCH_AGAIN;
 525         }
 526
 527 error:
 528         dbg("%s: failed:%d", __func__, ret);
 529         return DVBFE_ALGO_SEARCH_ERROR;
 530 }
 531
 532 static int cxd2820r_get_frontend_algo(struct dvb_frontend *fe)
 533 {
 534         return DVBFE_ALGO_CUSTOM;
 535 }
 536
 537 static void cxd2820r_release(struct dvb_frontend *fe)
 538 {
 539         struct cxd2820r_priv *priv = fe->demodulator_priv;
 540         dbg("%s", __func__);
 541
 542         kfree(priv);
 543         return;
 544 }
 545
 546 static int cxd2820r_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
 547 {
 548         struct cxd2820r_priv *priv = fe->demodulator_priv;
 549         dbg("%s: %d", __func__, enable);
 550
 551         /* Bit 0 of reg 0xdb in bank 0x00 controls I2C repeater */
 552         return cxd2820r_wr_reg_mask(priv, 0xdb, enable ? 1 : 0, 0x1);
 553 }
 554
 555 static const struct dvb_frontend_ops cxd2820r_ops = {
 556         .delsys = { SYS_DVBT, SYS_DVBT2, SYS_DVBC_ANNEX_A },
 557
 558         /* default: DVB-T/T2 */
 559         .info = {
 560                 .name = "Sony CXD2820R (DVB-T/T2)",
 561                 .type = FE_OFDM,
 562
 563                 .caps = FE_CAN_FEC_1_2                  |
 564                         FE_CAN_FEC_2_3                  |
 565                         FE_CAN_FEC_3_4                  |
 566                         FE_CAN_FEC_5_6                  |
 567                         FE_CAN_FEC_7_8                  |
 568                         FE_CAN_FEC_AUTO                 |
 569                         FE_CAN_QPSK                     |
 570                         FE_CAN_QAM_16                   |
 571                         FE_CAN_QAM_64                   |
 572                         FE_CAN_QAM_256                  |
 573                         FE_CAN_QAM_AUTO                 |
 574                         FE_CAN_TRANSMISSION_MODE_AUTO   |
 575                         FE_CAN_GUARD_INTERVAL_AUTO      |
 576                         FE_CAN_HIERARCHY_AUTO           |
 577                         FE_CAN_MUTE_TS                  |
 578                         FE_CAN_2G_MODULATION
 579                 },
 580
 581         .release                = cxd2820r_release,
 582         .init                   = cxd2820r_init,
 583         .sleep                  = cxd2820r_sleep,
 584
 585         .get_tune_settings      = cxd2820r_get_tune_settings,
 586         .i2c_gate_ctrl          = cxd2820r_i2c_gate_ctrl,
 587
 588         .get_frontend           = cxd2820r_get_frontend,
 589
 590         .get_frontend_algo      = cxd2820r_get_frontend_algo,
 591         .search                 = cxd2820r_search,
 592
 593         .read_status            = cxd2820r_read_status,
 594         .read_snr               = cxd2820r_read_snr,
 595         .read_ber               = cxd2820r_read_ber,
 596         .read_ucblocks          = cxd2820r_read_ucblocks,
 597         .read_signal_strength   = cxd2820r_read_signal_strength,
 598 };
 599
 600 struct dvb_frontend *cxd2820r_attach(const struct cxd2820r_config *cfg,
 601                                      struct i2c_adapter *i2c,
 602                                      struct dvb_frontend *fe)
 603 {
 604         struct cxd2820r_priv *priv = NULL;
 605         int ret;
 606         u8 tmp;
 607
 608         priv = kzalloc(sizeof (struct cxd2820r_priv), GFP_KERNEL);
 609         if (!priv)
 610                 goto error;
 611
 612         priv->i2c = i2c;
 613         memcpy(&priv->cfg, cfg, sizeof (struct cxd2820r_config));
 614
 615         priv->bank[0] = priv->bank[1] = 0xff;
 616         ret = cxd2820r_rd_reg(priv, 0x000fd, &tmp);
 617         dbg("%s: chip id=%02x", __func__, tmp);
 618         if (ret || tmp != 0xe1)
 619                 goto error;
 620
 621         memcpy(&priv->fe.ops, &cxd2820r_ops, sizeof (struct dvb_frontend_ops));
 622         priv->fe.demodulator_priv = priv;
 623         return &priv->fe;
 624 error:
 625         kfree(priv);
 626         return NULL;
 627 }
 628 EXPORT_SYMBOL(cxd2820r_attach);
 629
 630 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
 631 MODULE_DESCRIPTION("Sony CXD2820R demodulator driver");
 632 MODULE_LICENSE("GPL");