1 /* 2 STB6100 Silicon Tuner 3 Copyright (C) Manu Abraham (abraham.manu@gmail.com) 4 5 Copyright (C) ST Microelectronics 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 <linux/init.h> 23 #include <linux/kernel.h> 24 #include <linux/module.h> 25 #include <linux/slab.h> 26 #include <linux/string.h> 27 28 #include <media/dvb_frontend.h> 29 #include "stb6100.h" 30 31 static unsigned int verbose; 32 module_param(verbose, int, 0644); 33 34 /* Max transfer size done by I2C transfer functions */ 35 #define MAX_XFER_SIZE 64 36 37 #define FE_ERROR 0 38 #define FE_NOTICE 1 39 #define FE_INFO 2 40 #define FE_DEBUG 3 41 42 #define dprintk(x, y, z, format, arg...) do { \ 43 if (z) { \ 44 if ((x > FE_ERROR) && (x > y)) \ 45 printk(KERN_ERR "%s: " format "\n", __func__ , ##arg); \ 46 else if ((x > FE_NOTICE) && (x > y)) \ 47 printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg); \ 48 else if ((x > FE_INFO) && (x > y)) \ 49 printk(KERN_INFO "%s: " format "\n", __func__ , ##arg); \ 50 else if ((x > FE_DEBUG) && (x > y)) \ 51 printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg); \ 52 } else { \ 53 if (x > y) \ 54 printk(format, ##arg); \ 55 } \ 56 } while (0) 57 58 struct stb6100_lkup { 59 u32 val_low; 60 u32 val_high; 61 u8 reg; 62 }; 63 64 static void stb6100_release(struct dvb_frontend *fe); 65 66 static const struct stb6100_lkup lkup[] = { 67 { 0, 950000, 0x0a }, 68 { 950000, 1000000, 0x0a }, 69 { 1000000, 1075000, 0x0c }, 70 { 1075000, 1200000, 0x00 }, 71 { 1200000, 1300000, 0x01 }, 72 { 1300000, 1370000, 0x02 }, 73 { 1370000, 1470000, 0x04 }, 74 { 1470000, 1530000, 0x05 }, 75 { 1530000, 1650000, 0x06 }, 76 { 1650000, 1800000, 0x08 }, 77 { 1800000, 1950000, 0x0a }, 78 { 1950000, 2150000, 0x0c }, 79 { 2150000, 9999999, 0x0c }, 80 { 0, 0, 0x00 } 81 }; 82 83 /* Register names for easy debugging. */ 84 static const char *stb6100_regnames[] = { 85 [STB6100_LD] = "LD", 86 [STB6100_VCO] = "VCO", 87 [STB6100_NI] = "NI", 88 [STB6100_NF_LSB] = "NF", 89 [STB6100_K] = "K", 90 [STB6100_G] = "G", 91 [STB6100_F] = "F", 92 [STB6100_DLB] = "DLB", 93 [STB6100_TEST1] = "TEST1", 94 [STB6100_FCCK] = "FCCK", 95 [STB6100_LPEN] = "LPEN", 96 [STB6100_TEST3] = "TEST3", 97 }; 98 99 /* Template for normalisation, i.e. setting unused or undocumented 100 * bits as required according to the documentation. 101 */ 102 struct stb6100_regmask { 103 u8 mask; 104 u8 set; 105 }; 106 107 static const struct stb6100_regmask stb6100_template[] = { 108 [STB6100_LD] = { 0xff, 0x00 }, 109 [STB6100_VCO] = { 0xff, 0x00 }, 110 [STB6100_NI] = { 0xff, 0x00 }, 111 [STB6100_NF_LSB] = { 0xff, 0x00 }, 112 [STB6100_K] = { 0xc7, 0x38 }, 113 [STB6100_G] = { 0xef, 0x10 }, 114 [STB6100_F] = { 0x1f, 0xc0 }, 115 [STB6100_DLB] = { 0x38, 0xc4 }, 116 [STB6100_TEST1] = { 0x00, 0x8f }, 117 [STB6100_FCCK] = { 0x40, 0x0d }, 118 [STB6100_LPEN] = { 0xf0, 0x0b }, 119 [STB6100_TEST3] = { 0x00, 0xde }, 120 }; 121 122 /* 123 * Currently unused. Some boards might need it in the future 124 */ 125 static inline void stb6100_normalise_regs(u8 regs[]) 126 { 127 int i; 128 129 for (i = 0; i < STB6100_NUMREGS; i++) 130 regs[i] = (regs[i] & stb6100_template[i].mask) | stb6100_template[i].set; 131 } 132 133 static int stb6100_read_regs(struct stb6100_state *state, u8 regs[]) 134 { 135 int rc; 136 struct i2c_msg msg = { 137 .addr = state->config->tuner_address, 138 .flags = I2C_M_RD, 139 .buf = regs, 140 .len = STB6100_NUMREGS 141 }; 142 143 rc = i2c_transfer(state->i2c, &msg, 1); 144 if (unlikely(rc != 1)) { 145 dprintk(verbose, FE_ERROR, 1, "Read (0x%x) err, rc=[%d]", 146 state->config->tuner_address, rc); 147 148 return -EREMOTEIO; 149 } 150 if (unlikely(verbose > FE_DEBUG)) { 151 int i; 152 153 dprintk(verbose, FE_DEBUG, 1, " Read from 0x%02x", state->config->tuner_address); 154 for (i = 0; i < STB6100_NUMREGS; i++) 155 dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[i], regs[i]); 156 } 157 return 0; 158 } 159 160 static int stb6100_read_reg(struct stb6100_state *state, u8 reg) 161 { 162 u8 regs[STB6100_NUMREGS]; 163 164 struct i2c_msg msg = { 165 .addr = state->config->tuner_address + reg, 166 .flags = I2C_M_RD, 167 .buf = regs, 168 .len = 1 169 }; 170 171 i2c_transfer(state->i2c, &msg, 1); 172 173 if (unlikely(reg >= STB6100_NUMREGS)) { 174 dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg); 175 return -EINVAL; 176 } 177 if (unlikely(verbose > FE_DEBUG)) { 178 dprintk(verbose, FE_DEBUG, 1, " Read from 0x%02x", state->config->tuner_address); 179 dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[reg], regs[0]); 180 } 181 182 return (unsigned int)regs[0]; 183 } 184 185 static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int start, int len) 186 { 187 int rc; 188 u8 cmdbuf[MAX_XFER_SIZE]; 189 struct i2c_msg msg = { 190 .addr = state->config->tuner_address, 191 .flags = 0, 192 .buf = cmdbuf, 193 .len = len + 1 194 }; 195 196 if (1 + len > sizeof(cmdbuf)) { 197 printk(KERN_WARNING 198 "%s: i2c wr: len=%d is too big!\n", 199 KBUILD_MODNAME, len); 200 return -EINVAL; 201 } 202 203 if (unlikely(start < 1 || start + len > STB6100_NUMREGS)) { 204 dprintk(verbose, FE_ERROR, 1, "Invalid register range %d:%d", 205 start, len); 206 return -EINVAL; 207 } 208 memcpy(&cmdbuf[1], buf, len); 209 cmdbuf[0] = start; 210 211 if (unlikely(verbose > FE_DEBUG)) { 212 int i; 213 214 dprintk(verbose, FE_DEBUG, 1, " Write @ 0x%02x: [%d:%d]", state->config->tuner_address, start, len); 215 for (i = 0; i < len; i++) 216 dprintk(verbose, FE_DEBUG, 1, " %s: 0x%02x", stb6100_regnames[start + i], buf[i]); 217 } 218 rc = i2c_transfer(state->i2c, &msg, 1); 219 if (unlikely(rc != 1)) { 220 dprintk(verbose, FE_ERROR, 1, "(0x%x) write err [%d:%d], rc=[%d]", 221 (unsigned int)state->config->tuner_address, start, len, rc); 222 return -EREMOTEIO; 223 } 224 return 0; 225 } 226 227 static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data) 228 { 229 u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */ 230 231 if (unlikely(reg >= STB6100_NUMREGS)) { 232 dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg); 233 return -EREMOTEIO; 234 } 235 tmp = (tmp & stb6100_template[reg].mask) | stb6100_template[reg].set; 236 return stb6100_write_reg_range(state, &tmp, reg, 1); 237 } 238 239 240 static int stb6100_get_status(struct dvb_frontend *fe, u32 *status) 241 { 242 int rc; 243 struct stb6100_state *state = fe->tuner_priv; 244 245 rc = stb6100_read_reg(state, STB6100_LD); 246 if (rc < 0) { 247 dprintk(verbose, FE_ERROR, 1, "%s failed", __func__); 248 return rc; 249 } 250 return (rc & STB6100_LD_LOCK) ? TUNER_STATUS_LOCKED : 0; 251 } 252 253 static int stb6100_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth) 254 { 255 int rc; 256 u8 f; 257 u32 bw; 258 struct stb6100_state *state = fe->tuner_priv; 259 260 rc = stb6100_read_reg(state, STB6100_F); 261 if (rc < 0) 262 return rc; 263 f = rc & STB6100_F_F; 264 265 bw = (f + 5) * 2000; /* x2 for ZIF */ 266 267 *bandwidth = state->bandwidth = bw * 1000; 268 dprintk(verbose, FE_DEBUG, 1, "bandwidth = %u Hz", state->bandwidth); 269 return 0; 270 } 271 272 static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth) 273 { 274 u32 tmp; 275 int rc; 276 struct stb6100_state *state = fe->tuner_priv; 277 278 dprintk(verbose, FE_DEBUG, 1, "set bandwidth to %u Hz", bandwidth); 279 280 bandwidth /= 2; /* ZIF */ 281 282 if (bandwidth >= 36000000) /* F[4:0] BW/2 max =31+5=36 mhz for F=31 */ 283 tmp = 31; 284 else if (bandwidth <= 5000000) /* bw/2 min = 5Mhz for F=0 */ 285 tmp = 0; 286 else /* if 5 < bw/2 < 36 */ 287 tmp = (bandwidth + 500000) / 1000000 - 5; 288 289 /* Turn on LPF bandwidth setting clock control, 290 * set bandwidth, wait 10ms, turn off. 291 */ 292 rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d | STB6100_FCCK_FCCK); 293 if (rc < 0) 294 return rc; 295 rc = stb6100_write_reg(state, STB6100_F, 0xc0 | tmp); 296 if (rc < 0) 297 return rc; 298 299 msleep(5); /* This is dangerous as another (related) thread may start */ 300 301 rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d); 302 if (rc < 0) 303 return rc; 304 305 msleep(10); /* This is dangerous as another (related) thread may start */ 306 307 return 0; 308 } 309 310 static int stb6100_get_frequency(struct dvb_frontend *fe, u32 *frequency) 311 { 312 int rc; 313 u32 nint, nfrac, fvco; 314 int psd2, odiv; 315 struct stb6100_state *state = fe->tuner_priv; 316 u8 regs[STB6100_NUMREGS]; 317 318 rc = stb6100_read_regs(state, regs); 319 if (rc < 0) 320 return rc; 321 322 odiv = (regs[STB6100_VCO] & STB6100_VCO_ODIV) >> STB6100_VCO_ODIV_SHIFT; 323 psd2 = (regs[STB6100_K] & STB6100_K_PSD2) >> STB6100_K_PSD2_SHIFT; 324 nint = regs[STB6100_NI]; 325 nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) | regs[STB6100_NF_LSB]; 326 fvco = (nfrac * state->reference >> (9 - psd2)) + (nint * state->reference << psd2); 327 *frequency = state->frequency = fvco >> (odiv + 1); 328 329 dprintk(verbose, FE_DEBUG, 1, 330 "frequency = %u kHz, odiv = %u, psd2 = %u, fxtal = %u kHz, fvco = %u kHz, N(I) = %u, N(F) = %u", 331 state->frequency, odiv, psd2, state->reference, fvco, nint, nfrac); 332 return 0; 333 } 334 335 336 static int stb6100_set_frequency(struct dvb_frontend *fe, u32 frequency) 337 { 338 int rc; 339 const struct stb6100_lkup *ptr; 340 struct stb6100_state *state = fe->tuner_priv; 341 struct dtv_frontend_properties *p = &fe->dtv_property_cache; 342 343 u32 srate = 0, fvco, nint, nfrac; 344 u8 regs[STB6100_NUMREGS]; 345 u8 g, psd2, odiv; 346 347 dprintk(verbose, FE_DEBUG, 1, "Version 2010-8-14 13:51"); 348 349 if (fe->ops.get_frontend) { 350 dprintk(verbose, FE_DEBUG, 1, "Get frontend parameters"); 351 fe->ops.get_frontend(fe, p); 352 } 353 srate = p->symbol_rate; 354 355 /* Set up tuner cleanly, LPF calibration on */ 356 rc = stb6100_write_reg(state, STB6100_FCCK, 0x4d | STB6100_FCCK_FCCK); 357 if (rc < 0) 358 return rc; /* allow LPF calibration */ 359 360 /* PLL Loop disabled, bias on, VCO on, synth on */ 361 regs[STB6100_LPEN] = 0xeb; 362 rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]); 363 if (rc < 0) 364 return rc; 365 366 /* Program the registers with their data values */ 367 368 /* VCO divide ratio (LO divide ratio, VCO prescaler enable). */ 369 if (frequency <= 1075000) 370 odiv = 1; 371 else 372 odiv = 0; 373 374 /* VCO enabled, search clock off as per LL3.7, 3.4.1 */ 375 regs[STB6100_VCO] = 0xe0 | (odiv << STB6100_VCO_ODIV_SHIFT); 376 377 /* OSM */ 378 for (ptr = lkup; 379 (ptr->val_high != 0) && !CHKRANGE(frequency, ptr->val_low, ptr->val_high); 380 ptr++); 381 382 if (ptr->val_high == 0) { 383 printk(KERN_ERR "%s: frequency out of range: %u kHz\n", __func__, frequency); 384 return -EINVAL; 385 } 386 regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_OSM) | ptr->reg; 387 rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]); 388 if (rc < 0) 389 return rc; 390 391 if ((frequency > 1075000) && (frequency <= 1325000)) 392 psd2 = 0; 393 else 394 psd2 = 1; 395 /* F(VCO) = F(LO) * (ODIV == 0 ? 2 : 4) */ 396 fvco = frequency << (1 + odiv); 397 /* N(I) = floor(f(VCO) / (f(XTAL) * (PSD2 ? 2 : 1))) */ 398 nint = fvco / (state->reference << psd2); 399 /* N(F) = round(f(VCO) / f(XTAL) * (PSD2 ? 2 : 1) - N(I)) * 2 ^ 9 */ 400 nfrac = DIV_ROUND_CLOSEST((fvco - (nint * state->reference << psd2)) 401 << (9 - psd2), state->reference); 402 403 /* NI */ 404 regs[STB6100_NI] = nint; 405 rc = stb6100_write_reg(state, STB6100_NI, regs[STB6100_NI]); 406 if (rc < 0) 407 return rc; 408 409 /* NF */ 410 regs[STB6100_NF_LSB] = nfrac; 411 rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]); 412 if (rc < 0) 413 return rc; 414 415 /* K */ 416 regs[STB6100_K] = (0x38 & ~STB6100_K_PSD2) | (psd2 << STB6100_K_PSD2_SHIFT); 417 regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) | ((nfrac >> 8) & STB6100_K_NF_MSB); 418 rc = stb6100_write_reg(state, STB6100_K, regs[STB6100_K]); 419 if (rc < 0) 420 return rc; 421 422 /* G Baseband gain. */ 423 if (srate >= 15000000) 424 g = 9; /* +4 dB */ 425 else if (srate >= 5000000) 426 g = 11; /* +8 dB */ 427 else 428 g = 14; /* +14 dB */ 429 430 regs[STB6100_G] = (0x10 & ~STB6100_G_G) | g; 431 regs[STB6100_G] &= ~STB6100_G_GCT; /* mask GCT */ 432 regs[STB6100_G] |= (1 << 5); /* 2Vp-p Mode */ 433 rc = stb6100_write_reg(state, STB6100_G, regs[STB6100_G]); 434 if (rc < 0) 435 return rc; 436 437 /* F we don't write as it is set up in BW set */ 438 439 /* DLB set DC servo loop BW to 160Hz (LLA 3.8 / 2.1) */ 440 regs[STB6100_DLB] = 0xcc; 441 rc = stb6100_write_reg(state, STB6100_DLB, regs[STB6100_DLB]); 442 if (rc < 0) 443 return rc; 444 445 dprintk(verbose, FE_DEBUG, 1, 446 "frequency = %u, srate = %u, g = %u, odiv = %u, psd2 = %u, fxtal = %u, osm = %u, fvco = %u, N(I) = %u, N(F) = %u", 447 frequency, srate, (unsigned int)g, (unsigned int)odiv, 448 (unsigned int)psd2, state->reference, 449 ptr->reg, fvco, nint, nfrac); 450 451 /* Set up the test registers */ 452 regs[STB6100_TEST1] = 0x8f; 453 rc = stb6100_write_reg(state, STB6100_TEST1, regs[STB6100_TEST1]); 454 if (rc < 0) 455 return rc; 456 regs[STB6100_TEST3] = 0xde; 457 rc = stb6100_write_reg(state, STB6100_TEST3, regs[STB6100_TEST3]); 458 if (rc < 0) 459 return rc; 460 461 /* Bring up tuner according to LLA 3.7 3.4.1, step 2 */ 462 regs[STB6100_LPEN] = 0xfb; /* PLL Loop enabled, bias on, VCO on, synth on */ 463 rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]); 464 if (rc < 0) 465 return rc; 466 467 msleep(2); 468 469 /* Bring up tuner according to LLA 3.7 3.4.1, step 3 */ 470 regs[STB6100_VCO] &= ~STB6100_VCO_OCK; /* VCO fast search */ 471 rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]); 472 if (rc < 0) 473 return rc; 474 475 msleep(10); /* This is dangerous as another (related) thread may start */ /* wait for LO to lock */ 476 477 regs[STB6100_VCO] &= ~STB6100_VCO_OSCH; /* vco search disabled */ 478 regs[STB6100_VCO] |= STB6100_VCO_OCK; /* search clock off */ 479 rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]); 480 if (rc < 0) 481 return rc; 482 483 rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d); 484 if (rc < 0) 485 return rc; /* Stop LPF calibration */ 486 487 msleep(10); /* This is dangerous as another (related) thread may start */ 488 /* wait for stabilisation, (should not be necessary) */ 489 return 0; 490 } 491 492 static int stb6100_sleep(struct dvb_frontend *fe) 493 { 494 /* TODO: power down */ 495 return 0; 496 } 497 498 static int stb6100_init(struct dvb_frontend *fe) 499 { 500 struct stb6100_state *state = fe->tuner_priv; 501 int refclk = 27000000; /* Hz */ 502 503 /* 504 * iqsense = 1 505 * tunerstep = 125000 506 */ 507 state->bandwidth = 36000000; /* Hz */ 508 state->reference = refclk / 1000; /* kHz */ 509 510 /* Set default bandwidth. Modified, PN 13-May-10 */ 511 return 0; 512 } 513 514 static int stb6100_set_params(struct dvb_frontend *fe) 515 { 516 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 517 518 if (c->frequency > 0) 519 stb6100_set_frequency(fe, c->frequency); 520 521 if (c->bandwidth_hz > 0) 522 stb6100_set_bandwidth(fe, c->bandwidth_hz); 523 524 return 0; 525 } 526 527 static const struct dvb_tuner_ops stb6100_ops = { 528 .info = { 529 .name = "STB6100 Silicon Tuner", 530 .frequency_min = 950000, 531 .frequency_max = 2150000, 532 .frequency_step = 0, 533 }, 534 535 .init = stb6100_init, 536 .sleep = stb6100_sleep, 537 .get_status = stb6100_get_status, 538 .set_params = stb6100_set_params, 539 .get_frequency = stb6100_get_frequency, 540 .get_bandwidth = stb6100_get_bandwidth, 541 .release = stb6100_release 542 }; 543 544 struct dvb_frontend *stb6100_attach(struct dvb_frontend *fe, 545 const struct stb6100_config *config, 546 struct i2c_adapter *i2c) 547 { 548 struct stb6100_state *state = NULL; 549 550 state = kzalloc(sizeof (struct stb6100_state), GFP_KERNEL); 551 if (!state) 552 return NULL; 553 554 state->config = config; 555 state->i2c = i2c; 556 state->frontend = fe; 557 state->reference = config->refclock / 1000; /* kHz */ 558 fe->tuner_priv = state; 559 fe->ops.tuner_ops = stb6100_ops; 560 561 printk("%s: Attaching STB6100 \n", __func__); 562 return fe; 563 } 564 565 static void stb6100_release(struct dvb_frontend *fe) 566 { 567 struct stb6100_state *state = fe->tuner_priv; 568 569 fe->tuner_priv = NULL; 570 kfree(state); 571 } 572 573 EXPORT_SYMBOL(stb6100_attach); 574 MODULE_PARM_DESC(verbose, "Set Verbosity level"); 575 576 MODULE_AUTHOR("Manu Abraham"); 577 MODULE_DESCRIPTION("STB6100 Silicon tuner"); 578 MODULE_LICENSE("GPL"); 579