drivers/media/dvb/dvb-usb/mxl111sf-tuner.c

   1 /*
   2  *  mxl111sf-tuner.c - driver for the MaxLinear MXL111SF CMOS tuner
   3  *
   4  *  Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.com>
   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
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "mxl111sf-tuner.h"
  22 #include "mxl111sf-phy.h"
  23 #include "mxl111sf-reg.h"
  24
  25 /* debug */
  26 static int mxl111sf_tuner_debug;
  27 module_param_named(debug, mxl111sf_tuner_debug, int, 0644);
  28 MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
  29
  30 #define mxl_dbg(fmt, arg...) \
  31         if (mxl111sf_tuner_debug) \
  32                 mxl_printk(KERN_DEBUG, fmt, ##arg)
  33
  34 /* ------------------------------------------------------------------------ */
  35
  36 struct mxl111sf_tuner_state {
  37         struct mxl111sf_state *mxl_state;
  38
  39         struct mxl111sf_tuner_config *cfg;
  40
  41         enum mxl_if_freq if_freq;
  42
  43         u32 frequency;
  44         u32 bandwidth;
  45 };
  46
  47 static int mxl111sf_tuner_read_reg(struct mxl111sf_tuner_state *state,
  48                                    u8 addr, u8 *data)
  49 {
  50         return (state->cfg->read_reg) ?
  51                 state->cfg->read_reg(state->mxl_state, addr, data) :
  52                 -EINVAL;
  53 }
  54
  55 static int mxl111sf_tuner_write_reg(struct mxl111sf_tuner_state *state,
  56                                     u8 addr, u8 data)
  57 {
  58         return (state->cfg->write_reg) ?
  59                 state->cfg->write_reg(state->mxl_state, addr, data) :
  60                 -EINVAL;
  61 }
  62
  63 static int mxl111sf_tuner_program_regs(struct mxl111sf_tuner_state *state,
  64                                struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
  65 {
  66         return (state->cfg->program_regs) ?
  67                 state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
  68                 -EINVAL;
  69 }
  70
  71 static int mxl1x1sf_tuner_top_master_ctrl(struct mxl111sf_tuner_state *state,
  72                                           int onoff)
  73 {
  74         return (state->cfg->top_master_ctrl) ?
  75                 state->cfg->top_master_ctrl(state->mxl_state, onoff) :
  76                 -EINVAL;
  77 }
  78
  79 /* ------------------------------------------------------------------------ */
  80
  81 static struct mxl111sf_reg_ctrl_info mxl_phy_tune_rf[] = {
  82         {0x1d, 0x7f, 0x00}, /* channel bandwidth section 1/2/3,
  83                                DIG_MODEINDEX, _A, _CSF, */
  84         {0x1e, 0xff, 0x00}, /* channel frequency (lo and fractional) */
  85         {0x1f, 0xff, 0x00}, /* channel frequency (hi for integer portion) */
  86         {0,    0,    0}
  87 };
  88
  89 /* ------------------------------------------------------------------------ */
  90
  91 static struct mxl111sf_reg_ctrl_info *mxl111sf_calc_phy_tune_regs(u32 freq,
  92                                                                   u8 bw)
  93 {
  94         u8 filt_bw;
  95
  96         /* set channel bandwidth */
  97         switch (bw) {
  98         case 0: /* ATSC */
  99                 filt_bw = 25;
 100                 break;
 101         case 1: /* QAM */
 102                 filt_bw = 69;
 103                 break;
 104         case 6:
 105                 filt_bw = 21;
 106                 break;
 107         case 7:
 108                 filt_bw = 42;
 109                 break;
 110         case 8:
 111                 filt_bw = 63;
 112                 break;
 113         default:
 114                 err("%s: invalid bandwidth setting!", __func__);
 115                 return NULL;
 116         }
 117
 118         /* calculate RF channel */
 119         freq /= 1000000;
 120
 121         freq *= 64;
 122 #if 0
 123         /* do round */
 124         freq += 0.5;
 125 #endif
 126         /* set bandwidth */
 127         mxl_phy_tune_rf[0].data = filt_bw;
 128
 129         /* set RF */
 130         mxl_phy_tune_rf[1].data = (freq & 0xff);
 131         mxl_phy_tune_rf[2].data = (freq >> 8) & 0xff;
 132
 133         /* start tune */
 134         return mxl_phy_tune_rf;
 135 }
 136
 137 static int mxl1x1sf_tuner_set_if_output_freq(struct mxl111sf_tuner_state *state)
 138 {
 139         int ret;
 140         u8 ctrl;
 141 #if 0
 142         u16 iffcw;
 143         u32 if_freq;
 144 #endif
 145         mxl_dbg("(IF polarity = %d, IF freq = 0x%02x)",
 146                 state->cfg->invert_spectrum, state->cfg->if_freq);
 147
 148         /* set IF polarity */
 149         ctrl = state->cfg->invert_spectrum;
 150
 151         ctrl |= state->cfg->if_freq;
 152
 153         ret = mxl111sf_tuner_write_reg(state, V6_TUNER_IF_SEL_REG, ctrl);
 154         if (mxl_fail(ret))
 155                 goto fail;
 156
 157 #if 0
 158         if_freq /= 1000000;
 159
 160         /* do round */
 161         if_freq += 0.5;
 162
 163         if (MXL_IF_LO == state->cfg->if_freq) {
 164                 ctrl = 0x08;
 165                 iffcw = (u16)(if_freq / (108 * 4096));
 166         } else if (MXL_IF_HI == state->cfg->if_freq) {
 167                 ctrl = 0x08;
 168                 iffcw = (u16)(if_freq / (216 * 4096));
 169         } else {
 170                 ctrl = 0;
 171                 iffcw = 0;
 172         }
 173
 174         ctrl |= (iffcw >> 8);
 175 #endif
 176         ret = mxl111sf_tuner_read_reg(state, V6_TUNER_IF_FCW_BYP_REG, &ctrl);
 177         if (mxl_fail(ret))
 178                 goto fail;
 179
 180         ctrl &= 0xf0;
 181         ctrl |= 0x90;
 182
 183         ret = mxl111sf_tuner_write_reg(state, V6_TUNER_IF_FCW_BYP_REG, ctrl);
 184         if (mxl_fail(ret))
 185                 goto fail;
 186
 187 #if 0
 188         ctrl = iffcw & 0x00ff;
 189 #endif
 190         ret = mxl111sf_tuner_write_reg(state, V6_TUNER_IF_FCW_REG, ctrl);
 191         if (mxl_fail(ret))
 192                 goto fail;
 193
 194         state->if_freq = state->cfg->if_freq;
 195 fail:
 196         return ret;
 197 }
 198
 199 static int mxl1x1sf_tune_rf(struct dvb_frontend *fe, u32 freq, u8 bw)
 200 {
 201         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 202         static struct mxl111sf_reg_ctrl_info *reg_ctrl_array;
 203         int ret;
 204         u8 mxl_mode;
 205
 206         mxl_dbg("(freq = %d, bw = 0x%x)", freq, bw);
 207
 208         /* stop tune */
 209         ret = mxl111sf_tuner_write_reg(state, START_TUNE_REG, 0);
 210         if (mxl_fail(ret))
 211                 goto fail;
 212
 213         /* check device mode */
 214         ret = mxl111sf_tuner_read_reg(state, MXL_MODE_REG, &mxl_mode);
 215         if (mxl_fail(ret))
 216                 goto fail;
 217
 218         /* Fill out registers for channel tune */
 219         reg_ctrl_array = mxl111sf_calc_phy_tune_regs(freq, bw);
 220         if (!reg_ctrl_array)
 221                 return -EINVAL;
 222
 223         ret = mxl111sf_tuner_program_regs(state, reg_ctrl_array);
 224         if (mxl_fail(ret))
 225                 goto fail;
 226
 227         if ((mxl_mode & MXL_DEV_MODE_MASK) == MXL_TUNER_MODE) {
 228                 /* IF tuner mode only */
 229                 mxl1x1sf_tuner_top_master_ctrl(state, 0);
 230                 mxl1x1sf_tuner_top_master_ctrl(state, 1);
 231                 mxl1x1sf_tuner_set_if_output_freq(state);
 232         }
 233
 234         ret = mxl111sf_tuner_write_reg(state, START_TUNE_REG, 1);
 235         if (mxl_fail(ret))
 236                 goto fail;
 237
 238         if (state->cfg->ant_hunt)
 239                 state->cfg->ant_hunt(fe);
 240 fail:
 241         return ret;
 242 }
 243
 244 static int mxl1x1sf_tuner_get_lock_status(struct mxl111sf_tuner_state *state,
 245                                           int *rf_synth_lock,
 246                                           int *ref_synth_lock)
 247 {
 248         int ret;
 249         u8 data;
 250
 251         *rf_synth_lock = 0;
 252         *ref_synth_lock = 0;
 253
 254         ret = mxl111sf_tuner_read_reg(state, V6_RF_LOCK_STATUS_REG, &data);
 255         if (mxl_fail(ret))
 256                 goto fail;
 257
 258         *ref_synth_lock = ((data & 0x03) == 0x03) ? 1 : 0;
 259         *rf_synth_lock  = ((data & 0x0c) == 0x0c) ? 1 : 0;
 260 fail:
 261         return ret;
 262 }
 263
 264 #if 0
 265 static int mxl1x1sf_tuner_loop_thru_ctrl(struct mxl111sf_tuner_state *state,
 266                                          int onoff)
 267 {
 268         return mxl111sf_tuner_write_reg(state, V6_TUNER_LOOP_THRU_CTRL_REG,
 269                                         onoff ? 1 : 0);
 270 }
 271 #endif
 272
 273 /* ------------------------------------------------------------------------ */
 274
 275 static int mxl111sf_tuner_set_params(struct dvb_frontend *fe)
 276 {
 277         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 278         u32 delsys  = c->delivery_system;
 279         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 280         int ret;
 281         u8 bw;
 282
 283         mxl_dbg("()");
 284
 285         switch (delsys) {
 286         case SYS_ATSC:
 287                 bw = 0; /* ATSC */
 288                 break;
 289         case SYS_DVBC_ANNEX_B:
 290                 bw = 1; /* US CABLE */
 291                 break;
 292         case SYS_DVBT:
 293                 switch (c->bandwidth_hz) {
 294                 case 6000000:
 295                         bw = 6;
 296                         break;
 297                 case 7000000:
 298                         bw = 7;
 299                         break;
 300                 case 8000000:
 301                         bw = 8;
 302                         break;
 303                 default:
 304                         err("%s: bandwidth not set!", __func__);
 305                         return -EINVAL;
 306                 }
 307                 break;
 308         default:
 309                 err("%s: modulation type not supported!", __func__);
 310                 return -EINVAL;
 311         }
 312         ret = mxl1x1sf_tune_rf(fe, c->frequency, bw);
 313         if (mxl_fail(ret))
 314                 goto fail;
 315
 316         state->frequency = c->frequency;
 317         state->bandwidth = c->bandwidth_hz;
 318 fail:
 319         return ret;
 320 }
 321
 322 /* ------------------------------------------------------------------------ */
 323
 324 #if 0
 325 static int mxl111sf_tuner_init(struct dvb_frontend *fe)
 326 {
 327         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 328         int ret;
 329
 330         /* wake from standby handled by usb driver */
 331
 332         return ret;
 333 }
 334
 335 static int mxl111sf_tuner_sleep(struct dvb_frontend *fe)
 336 {
 337         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 338         int ret;
 339
 340         /* enter standby mode handled by usb driver */
 341
 342         return ret;
 343 }
 344 #endif
 345
 346 /* ------------------------------------------------------------------------ */
 347
 348 static int mxl111sf_tuner_get_status(struct dvb_frontend *fe, u32 *status)
 349 {
 350         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 351         int rf_locked, ref_locked, ret;
 352
 353         *status = 0;
 354
 355         ret = mxl1x1sf_tuner_get_lock_status(state, &rf_locked, &ref_locked);
 356         if (mxl_fail(ret))
 357                 goto fail;
 358         mxl_info("%s%s", rf_locked ? "rf locked " : "",
 359                  ref_locked ? "ref locked" : "");
 360
 361         if ((rf_locked) || (ref_locked))
 362                 *status |= TUNER_STATUS_LOCKED;
 363 fail:
 364         return ret;
 365 }
 366
 367 static int mxl111sf_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
 368 {
 369         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 370         u8 val1, val2;
 371         int ret;
 372
 373         *strength = 0;
 374
 375         ret = mxl111sf_tuner_write_reg(state, 0x00, 0x02);
 376         if (mxl_fail(ret))
 377                 goto fail;
 378         ret = mxl111sf_tuner_read_reg(state, V6_DIG_RF_PWR_LSB_REG, &val1);
 379         if (mxl_fail(ret))
 380                 goto fail;
 381         ret = mxl111sf_tuner_read_reg(state, V6_DIG_RF_PWR_MSB_REG, &val2);
 382         if (mxl_fail(ret))
 383                 goto fail;
 384
 385         *strength = val1 | ((val2 & 0x07) << 8);
 386 fail:
 387         ret = mxl111sf_tuner_write_reg(state, 0x00, 0x00);
 388         mxl_fail(ret);
 389
 390         return ret;
 391 }
 392
 393 /* ------------------------------------------------------------------------ */
 394
 395 static int mxl111sf_tuner_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 396 {
 397         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 398         *frequency = state->frequency;
 399         return 0;
 400 }
 401
 402 static int mxl111sf_tuner_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 403 {
 404         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 405         *bandwidth = state->bandwidth;
 406         return 0;
 407 }
 408
 409 static int mxl111sf_tuner_get_if_frequency(struct dvb_frontend *fe,
 410                                            u32 *frequency)
 411 {
 412         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 413
 414         *frequency = 0;
 415
 416         switch (state->if_freq) {
 417         case MXL_IF_4_0:   /* 4.0   MHz */
 418                 *frequency = 4000000;
 419                 break;
 420         case MXL_IF_4_5:   /* 4.5   MHz */
 421                 *frequency = 4500000;
 422                 break;
 423         case MXL_IF_4_57:  /* 4.57  MHz */
 424                 *frequency = 4570000;
 425                 break;
 426         case MXL_IF_5_0:   /* 5.0   MHz */
 427                 *frequency = 5000000;
 428                 break;
 429         case MXL_IF_5_38:  /* 5.38  MHz */
 430                 *frequency = 5380000;
 431                 break;
 432         case MXL_IF_6_0:   /* 6.0   MHz */
 433                 *frequency = 6000000;
 434                 break;
 435         case MXL_IF_6_28:  /* 6.28  MHz */
 436                 *frequency = 6280000;
 437                 break;
 438         case MXL_IF_7_2:   /* 7.2   MHz */
 439                 *frequency = 7200000;
 440                 break;
 441         case MXL_IF_35_25: /* 35.25 MHz */
 442                 *frequency = 35250000;
 443                 break;
 444         case MXL_IF_36:    /* 36    MHz */
 445                 *frequency = 36000000;
 446                 break;
 447         case MXL_IF_36_15: /* 36.15 MHz */
 448                 *frequency = 36150000;
 449                 break;
 450         case MXL_IF_44:    /* 44    MHz */
 451                 *frequency = 44000000;
 452                 break;
 453         }
 454         return 0;
 455 }
 456
 457 static int mxl111sf_tuner_release(struct dvb_frontend *fe)
 458 {
 459         struct mxl111sf_tuner_state *state = fe->tuner_priv;
 460         mxl_dbg("()");
 461         kfree(state);
 462         fe->tuner_priv = NULL;
 463         return 0;
 464 }
 465
 466 /* ------------------------------------------------------------------------- */
 467
 468 static struct dvb_tuner_ops mxl111sf_tuner_tuner_ops = {
 469         .info = {
 470                 .name = "MaxLinear MxL111SF",
 471 #if 0
 472                 .frequency_min  = ,
 473                 .frequency_max  = ,
 474                 .frequency_step = ,
 475 #endif
 476         },
 477 #if 0
 478         .init              = mxl111sf_tuner_init,
 479         .sleep             = mxl111sf_tuner_sleep,
 480 #endif
 481         .set_params        = mxl111sf_tuner_set_params,
 482         .get_status        = mxl111sf_tuner_get_status,
 483         .get_rf_strength   = mxl111sf_get_rf_strength,
 484         .get_frequency     = mxl111sf_tuner_get_frequency,
 485         .get_bandwidth     = mxl111sf_tuner_get_bandwidth,
 486         .get_if_frequency  = mxl111sf_tuner_get_if_frequency,
 487         .release           = mxl111sf_tuner_release,
 488 };
 489
 490 struct dvb_frontend *mxl111sf_tuner_attach(struct dvb_frontend *fe,
 491                                            struct mxl111sf_state *mxl_state,
 492                                            struct mxl111sf_tuner_config *cfg)
 493 {
 494         struct mxl111sf_tuner_state *state = NULL;
 495
 496         mxl_dbg("()");
 497
 498         state = kzalloc(sizeof(struct mxl111sf_tuner_state), GFP_KERNEL);
 499         if (state == NULL)
 500                 return NULL;
 501
 502         state->mxl_state = mxl_state;
 503         state->cfg = cfg;
 504
 505         memcpy(&fe->ops.tuner_ops, &mxl111sf_tuner_tuner_ops,
 506                sizeof(struct dvb_tuner_ops));
 507
 508         fe->tuner_priv = state;
 509         return fe;
 510 }
 511 EXPORT_SYMBOL_GPL(mxl111sf_tuner_attach);
 512
 513 MODULE_DESCRIPTION("MaxLinear MxL111SF CMOS tuner driver");
 514 MODULE_AUTHOR("Michael Krufky <mkrufky@kernellabs.com>");
 515 MODULE_LICENSE("GPL");
 516 MODULE_VERSION("0.1");
 517
 518 /*
 519  * Overrides for Emacs so that we follow Linus's tabbing style.
 520  * ---------------------------------------------------------------------------
 521  * Local variables:
 522  * c-basic-offset: 8
 523  * End:
 524  */