drivers/media/dvb/frontends/au8522_dig.c

   1 /*
   2     Auvitek AU8522 QAM/8VSB demodulator driver
   3
   4     Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
   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
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include "dvb_frontend.h"
  29 #include "au8522.h"
  30 #include "au8522_priv.h"
  31
  32 static int debug;
  33
  34 #define dprintk(arg...) do {            \
  35         if (debug)                      \
  36                  printk(arg);           \
  37         } while (0)
  38
  39 /* 16 bit registers, 8 bit values */
  40 int au8522_writereg(struct au8522_state *state, u16 reg, u8 data)
  41 {
  42         int ret;
  43         u8 buf [] = { reg >> 8, reg & 0xff, data };
  44
  45         struct i2c_msg msg = { .addr = state->config->demod_address,
  46                                .flags = 0, .buf = buf, .len = 3 };
  47
  48         ret = i2c_transfer(state->i2c, &msg, 1);
  49
  50         if (ret != 1)
  51                 printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
  52                        "ret == %i)\n", __func__, reg, data, ret);
  53
  54         return (ret != 1) ? -1 : 0;
  55 }
  56
  57 u8 au8522_readreg(struct au8522_state *state, u16 reg)
  58 {
  59         int ret;
  60         u8 b0 [] = { reg >> 8, reg & 0xff };
  61         u8 b1 [] = { 0 };
  62
  63         struct i2c_msg msg [] = {
  64                 { .addr = state->config->demod_address, .flags = 0,
  65                   .buf = b0, .len = 2 },
  66                 { .addr = state->config->demod_address, .flags = I2C_M_RD,
  67                   .buf = b1, .len = 1 } };
  68
  69         ret = i2c_transfer(state->i2c, msg, 2);
  70
  71         if (ret != 2)
  72                 printk(KERN_ERR "%s: readreg error (ret == %i)\n",
  73                        __func__, ret);
  74         return b1[0];
  75 }
  76
  77 static int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
  78 {
  79         struct au8522_state *state = fe->demodulator_priv;
  80
  81         dprintk("%s(%d)\n", __func__, enable);
  82
  83         if (enable)
  84                 return au8522_writereg(state, 0x106, 1);
  85         else
  86                 return au8522_writereg(state, 0x106, 0);
  87 }
  88
  89 struct mse2snr_tab {
  90         u16 val;
  91         u16 data;
  92 };
  93
  94 /* VSB SNR lookup table */
  95 static struct mse2snr_tab vsb_mse2snr_tab[] = {
  96         {   0, 270 },
  97         {   2, 250 },
  98         {   3, 240 },
  99         {   5, 230 },
 100         {   7, 220 },
 101         {   9, 210 },
 102         {  12, 200 },
 103         {  13, 195 },
 104         {  15, 190 },
 105         {  17, 185 },
 106         {  19, 180 },
 107         {  21, 175 },
 108         {  24, 170 },
 109         {  27, 165 },
 110         {  31, 160 },
 111         {  32, 158 },
 112         {  33, 156 },
 113         {  36, 152 },
 114         {  37, 150 },
 115         {  39, 148 },
 116         {  40, 146 },
 117         {  41, 144 },
 118         {  43, 142 },
 119         {  44, 140 },
 120         {  48, 135 },
 121         {  50, 130 },
 122         {  43, 142 },
 123         {  53, 125 },
 124         {  56, 120 },
 125         { 256, 115 },
 126 };
 127
 128 /* QAM64 SNR lookup table */
 129 static struct mse2snr_tab qam64_mse2snr_tab[] = {
 130         {  15,   0 },
 131         {  16, 290 },
 132         {  17, 288 },
 133         {  18, 286 },
 134         {  19, 284 },
 135         {  20, 282 },
 136         {  21, 281 },
 137         {  22, 279 },
 138         {  23, 277 },
 139         {  24, 275 },
 140         {  25, 273 },
 141         {  26, 271 },
 142         {  27, 269 },
 143         {  28, 268 },
 144         {  29, 266 },
 145         {  30, 264 },
 146         {  31, 262 },
 147         {  32, 260 },
 148         {  33, 259 },
 149         {  34, 258 },
 150         {  35, 256 },
 151         {  36, 255 },
 152         {  37, 254 },
 153         {  38, 252 },
 154         {  39, 251 },
 155         {  40, 250 },
 156         {  41, 249 },
 157         {  42, 248 },
 158         {  43, 246 },
 159         {  44, 245 },
 160         {  45, 244 },
 161         {  46, 242 },
 162         {  47, 241 },
 163         {  48, 240 },
 164         {  50, 239 },
 165         {  51, 238 },
 166         {  53, 237 },
 167         {  54, 236 },
 168         {  56, 235 },
 169         {  57, 234 },
 170         {  59, 233 },
 171         {  60, 232 },
 172         {  62, 231 },
 173         {  63, 230 },
 174         {  65, 229 },
 175         {  67, 228 },
 176         {  68, 227 },
 177         {  70, 226 },
 178         {  71, 225 },
 179         {  73, 224 },
 180         {  74, 223 },
 181         {  76, 222 },
 182         {  78, 221 },
 183         {  80, 220 },
 184         {  82, 219 },
 185         {  85, 218 },
 186         {  88, 217 },
 187         {  90, 216 },
 188         {  92, 215 },
 189         {  93, 214 },
 190         {  94, 212 },
 191         {  95, 211 },
 192         {  97, 210 },
 193         {  99, 209 },
 194         { 101, 208 },
 195         { 102, 207 },
 196         { 104, 206 },
 197         { 107, 205 },
 198         { 111, 204 },
 199         { 114, 203 },
 200         { 118, 202 },
 201         { 122, 201 },
 202         { 125, 200 },
 203         { 128, 199 },
 204         { 130, 198 },
 205         { 132, 197 },
 206         { 256, 190 },
 207 };
 208
 209 /* QAM256 SNR lookup table */
 210 static struct mse2snr_tab qam256_mse2snr_tab[] = {
 211         {  16,   0 },
 212         {  17, 400 },
 213         {  18, 398 },
 214         {  19, 396 },
 215         {  20, 394 },
 216         {  21, 392 },
 217         {  22, 390 },
 218         {  23, 388 },
 219         {  24, 386 },
 220         {  25, 384 },
 221         {  26, 382 },
 222         {  27, 380 },
 223         {  28, 379 },
 224         {  29, 378 },
 225         {  30, 377 },
 226         {  31, 376 },
 227         {  32, 375 },
 228         {  33, 374 },
 229         {  34, 373 },
 230         {  35, 372 },
 231         {  36, 371 },
 232         {  37, 370 },
 233         {  38, 362 },
 234         {  39, 354 },
 235         {  40, 346 },
 236         {  41, 338 },
 237         {  42, 330 },
 238         {  43, 328 },
 239         {  44, 326 },
 240         {  45, 324 },
 241         {  46, 322 },
 242         {  47, 320 },
 243         {  48, 319 },
 244         {  49, 318 },
 245         {  50, 317 },
 246         {  51, 316 },
 247         {  52, 315 },
 248         {  53, 314 },
 249         {  54, 313 },
 250         {  55, 312 },
 251         {  56, 311 },
 252         {  57, 310 },
 253         {  58, 308 },
 254         {  59, 306 },
 255         {  60, 304 },
 256         {  61, 302 },
 257         {  62, 300 },
 258         {  63, 298 },
 259         {  65, 295 },
 260         {  68, 294 },
 261         {  70, 293 },
 262         {  73, 292 },
 263         {  76, 291 },
 264         {  78, 290 },
 265         {  79, 289 },
 266         {  81, 288 },
 267         {  82, 287 },
 268         {  83, 286 },
 269         {  84, 285 },
 270         {  85, 284 },
 271         {  86, 283 },
 272         {  88, 282 },
 273         {  89, 281 },
 274         { 256, 280 },
 275 };
 276
 277 static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
 278                                  u16 *snr)
 279 {
 280         int i, ret = -EINVAL;
 281         dprintk("%s()\n", __func__);
 282
 283         for (i = 0; i < sz; i++) {
 284                 if (mse < tab[i].val) {
 285                         *snr = tab[i].data;
 286                         ret = 0;
 287                         break;
 288                 }
 289         }
 290         dprintk("%s() snr=%d\n", __func__, *snr);
 291         return ret;
 292 }
 293
 294 static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
 295 {
 296         struct au8522_state *state = fe->demodulator_priv;
 297         u8 r0b5, r0b6, r0b7;
 298         char *ifmhz;
 299
 300         switch (if_freq) {
 301         case AU8522_IF_3_25MHZ:
 302                 ifmhz = "3.25";
 303                 r0b5 = 0x00;
 304                 r0b6 = 0x3d;
 305                 r0b7 = 0xa0;
 306                 break;
 307         case AU8522_IF_4MHZ:
 308                 ifmhz = "4.00";
 309                 r0b5 = 0x00;
 310                 r0b6 = 0x4b;
 311                 r0b7 = 0xd9;
 312                 break;
 313         case AU8522_IF_6MHZ:
 314                 ifmhz = "6.00";
 315                 r0b5 = 0xfb;
 316                 r0b6 = 0x8e;
 317                 r0b7 = 0x39;
 318                 break;
 319         default:
 320                 dprintk("%s() IF Frequency not supported\n", __func__);
 321                 return -EINVAL;
 322         }
 323         dprintk("%s() %s MHz\n", __func__, ifmhz);
 324         au8522_writereg(state, 0x80b5, r0b5);
 325         au8522_writereg(state, 0x80b6, r0b6);
 326         au8522_writereg(state, 0x80b7, r0b7);
 327
 328         return 0;
 329 }
 330
 331 /* VSB Modulation table */
 332 static struct {
 333         u16 reg;
 334         u16 data;
 335 } VSB_mod_tab[] = {
 336         { 0x8090, 0x84 },
 337         { 0x4092, 0x11 },
 338         { 0x2005, 0x00 },
 339         { 0x8091, 0x80 },
 340         { 0x80a3, 0x0c },
 341         { 0x80a4, 0xe8 },
 342         { 0x8081, 0xc4 },
 343         { 0x80a5, 0x40 },
 344         { 0x80a7, 0x40 },
 345         { 0x80a6, 0x67 },
 346         { 0x8262, 0x20 },
 347         { 0x821c, 0x30 },
 348         { 0x80d8, 0x1a },
 349         { 0x8227, 0xa0 },
 350         { 0x8121, 0xff },
 351         { 0x80a8, 0xf0 },
 352         { 0x80a9, 0x05 },
 353         { 0x80aa, 0x77 },
 354         { 0x80ab, 0xf0 },
 355         { 0x80ac, 0x05 },
 356         { 0x80ad, 0x77 },
 357         { 0x80ae, 0x41 },
 358         { 0x80af, 0x66 },
 359         { 0x821b, 0xcc },
 360         { 0x821d, 0x80 },
 361         { 0x80a4, 0xe8 },
 362         { 0x8231, 0x13 },
 363 };
 364
 365 /* QAM Modulation table */
 366 static struct {
 367         u16 reg;
 368         u16 data;
 369 } QAM_mod_tab[] = {
 370         { 0x80a3, 0x09 },
 371         { 0x80a4, 0x00 },
 372         { 0x8081, 0xc4 },
 373         { 0x80a5, 0x40 },
 374         { 0x80aa, 0x77 },
 375         { 0x80ad, 0x77 },
 376         { 0x80a6, 0x67 },
 377         { 0x8262, 0x20 },
 378         { 0x821c, 0x30 },
 379         { 0x80b8, 0x3e },
 380         { 0x80b9, 0xf0 },
 381         { 0x80ba, 0x01 },
 382         { 0x80bb, 0x18 },
 383         { 0x80bc, 0x50 },
 384         { 0x80bd, 0x00 },
 385         { 0x80be, 0xea },
 386         { 0x80bf, 0xef },
 387         { 0x80c0, 0xfc },
 388         { 0x80c1, 0xbd },
 389         { 0x80c2, 0x1f },
 390         { 0x80c3, 0xfc },
 391         { 0x80c4, 0xdd },
 392         { 0x80c5, 0xaf },
 393         { 0x80c6, 0x00 },
 394         { 0x80c7, 0x38 },
 395         { 0x80c8, 0x30 },
 396         { 0x80c9, 0x05 },
 397         { 0x80ca, 0x4a },
 398         { 0x80cb, 0xd0 },
 399         { 0x80cc, 0x01 },
 400         { 0x80cd, 0xd9 },
 401         { 0x80ce, 0x6f },
 402         { 0x80cf, 0xf9 },
 403         { 0x80d0, 0x70 },
 404         { 0x80d1, 0xdf },
 405         { 0x80d2, 0xf7 },
 406         { 0x80d3, 0xc2 },
 407         { 0x80d4, 0xdf },
 408         { 0x80d5, 0x02 },
 409         { 0x80d6, 0x9a },
 410         { 0x80d7, 0xd0 },
 411         { 0x8250, 0x0d },
 412         { 0x8251, 0xcd },
 413         { 0x8252, 0xe0 },
 414         { 0x8253, 0x05 },
 415         { 0x8254, 0xa7 },
 416         { 0x8255, 0xff },
 417         { 0x8256, 0xed },
 418         { 0x8257, 0x5b },
 419         { 0x8258, 0xae },
 420         { 0x8259, 0xe6 },
 421         { 0x825a, 0x3d },
 422         { 0x825b, 0x0f },
 423         { 0x825c, 0x0d },
 424         { 0x825d, 0xea },
 425         { 0x825e, 0xf2 },
 426         { 0x825f, 0x51 },
 427         { 0x8260, 0xf5 },
 428         { 0x8261, 0x06 },
 429         { 0x821a, 0x00 },
 430         { 0x8546, 0x40 },
 431         { 0x8210, 0x26 },
 432         { 0x8211, 0xf6 },
 433         { 0x8212, 0x84 },
 434         { 0x8213, 0x02 },
 435         { 0x8502, 0x01 },
 436         { 0x8121, 0x04 },
 437         { 0x8122, 0x04 },
 438         { 0x852e, 0x10 },
 439         { 0x80a4, 0xca },
 440         { 0x80a7, 0x40 },
 441         { 0x8526, 0x01 },
 442 };
 443
 444 static int au8522_enable_modulation(struct dvb_frontend *fe,
 445                                     fe_modulation_t m)
 446 {
 447         struct au8522_state *state = fe->demodulator_priv;
 448         int i;
 449
 450         dprintk("%s(0x%08x)\n", __func__, m);
 451
 452         switch (m) {
 453         case VSB_8:
 454                 dprintk("%s() VSB_8\n", __func__);
 455                 for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
 456                         au8522_writereg(state,
 457                                 VSB_mod_tab[i].reg,
 458                                 VSB_mod_tab[i].data);
 459                 au8522_set_if(fe, state->config->vsb_if);
 460                 break;
 461         case QAM_64:
 462         case QAM_256:
 463                 dprintk("%s() QAM 64/256\n", __func__);
 464                 for (i = 0; i < ARRAY_SIZE(QAM_mod_tab); i++)
 465                         au8522_writereg(state,
 466                                 QAM_mod_tab[i].reg,
 467                                 QAM_mod_tab[i].data);
 468                 au8522_set_if(fe, state->config->qam_if);
 469                 break;
 470         default:
 471                 dprintk("%s() Invalid modulation\n", __func__);
 472                 return -EINVAL;
 473         }
 474
 475         state->current_modulation = m;
 476
 477         return 0;
 478 }
 479
 480 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 481 static int au8522_set_frontend(struct dvb_frontend *fe,
 482                                struct dvb_frontend_parameters *p)
 483 {
 484         struct au8522_state *state = fe->demodulator_priv;
 485         int ret = -EINVAL;
 486
 487         dprintk("%s(frequency=%d)\n", __func__, p->frequency);
 488
 489         if ((state->current_frequency == p->frequency) &&
 490             (state->current_modulation == p->u.vsb.modulation))
 491                 return 0;
 492
 493         au8522_enable_modulation(fe, p->u.vsb.modulation);
 494
 495         /* Allow the demod to settle */
 496         msleep(100);
 497
 498         if (fe->ops.tuner_ops.set_params) {
 499                 if (fe->ops.i2c_gate_ctrl)
 500                         fe->ops.i2c_gate_ctrl(fe, 1);
 501                 ret = fe->ops.tuner_ops.set_params(fe, p);
 502                 if (fe->ops.i2c_gate_ctrl)
 503                         fe->ops.i2c_gate_ctrl(fe, 0);
 504         }
 505
 506         if (ret < 0)
 507                 return ret;
 508
 509         state->current_frequency = p->frequency;
 510
 511         return 0;
 512 }
 513
 514 /* Reset the demod hardware and reset all of the configuration registers
 515    to a default state. */
 516 int au8522_init(struct dvb_frontend *fe)
 517 {
 518         struct au8522_state *state = fe->demodulator_priv;
 519         dprintk("%s()\n", __func__);
 520
 521         au8522_writereg(state, 0xa4, 1 << 5);
 522
 523         au8522_i2c_gate_ctrl(fe, 1);
 524
 525         return 0;
 526 }
 527
 528 static int au8522_led_gpio_enable(struct au8522_state *state, int onoff)
 529 {
 530         struct au8522_led_config *led_config = state->config->led_cfg;
 531         u8 val;
 532
 533         /* bail out if we cant control an LED */
 534         if (!led_config || !led_config->gpio_output ||
 535             !led_config->gpio_output_enable || !led_config->gpio_output_disable)
 536                 return 0;
 537
 538         val = au8522_readreg(state, 0x4000 |
 539                              (led_config->gpio_output & ~0xc000));
 540         if (onoff) {
 541                 /* enable GPIO output */
 542                 val &= ~((led_config->gpio_output_enable >> 8) & 0xff);
 543                 val |=  (led_config->gpio_output_enable & 0xff);
 544         } else {
 545                 /* disable GPIO output */
 546                 val &= ~((led_config->gpio_output_disable >> 8) & 0xff);
 547                 val |=  (led_config->gpio_output_disable & 0xff);
 548         }
 549         return au8522_writereg(state, 0x8000 |
 550                                (led_config->gpio_output & ~0xc000), val);
 551 }
 552
 553 /* led = 0 | off
 554  * led = 1 | signal ok
 555  * led = 2 | signal strong
 556  * led < 0 | only light led if leds are currently off
 557  */
 558 static int au8522_led_ctrl(struct au8522_state *state, int led)
 559 {
 560         struct au8522_led_config *led_config = state->config->led_cfg;
 561         int i, ret = 0;
 562
 563         /* bail out if we cant control an LED */
 564         if (!led_config || !led_config->gpio_leds ||
 565             !led_config->num_led_states || !led_config->led_states)
 566                 return 0;
 567
 568         if (led < 0) {
 569                 /* if LED is already lit, then leave it as-is */
 570                 if (state->led_state)
 571                         return 0;
 572                 else
 573                         led *= -1;
 574         }
 575
 576         /* toggle LED if changing state */
 577         if (state->led_state != led) {
 578                 u8 val;
 579
 580                 dprintk("%s: %d\n", __func__, led);
 581
 582                 au8522_led_gpio_enable(state, 1);
 583
 584                 val = au8522_readreg(state, 0x4000 |
 585                                      (led_config->gpio_leds & ~0xc000));
 586
 587                 /* start with all leds off */
 588                 for (i = 0; i < led_config->num_led_states; i++)
 589                         val &= ~led_config->led_states[i];
 590
 591                 /* set selected LED state */
 592                 if (led < led_config->num_led_states)
 593                         val |= led_config->led_states[led];
 594                 else if (led_config->num_led_states)
 595                         val |=
 596                         led_config->led_states[led_config->num_led_states - 1];
 597
 598                 ret = au8522_writereg(state, 0x8000 |
 599                                       (led_config->gpio_leds & ~0xc000), val);
 600                 if (ret < 0)
 601                         return ret;
 602
 603                 state->led_state = led;
 604
 605                 if (led == 0)
 606                         au8522_led_gpio_enable(state, 0);
 607         }
 608
 609         return 0;
 610 }
 611
 612 int au8522_sleep(struct dvb_frontend *fe)
 613 {
 614         struct au8522_state *state = fe->demodulator_priv;
 615         dprintk("%s()\n", __func__);
 616
 617         /* turn off led */
 618         au8522_led_ctrl(state, 0);
 619
 620         state->current_frequency = 0;
 621
 622         return 0;
 623 }
 624
 625 static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
 626 {
 627         struct au8522_state *state = fe->demodulator_priv;
 628         u8 reg;
 629         u32 tuner_status = 0;
 630
 631         *status = 0;
 632
 633         if (state->current_modulation == VSB_8) {
 634                 dprintk("%s() Checking VSB_8\n", __func__);
 635                 reg = au8522_readreg(state, 0x4088);
 636                 if ((reg & 0x03) == 0x03)
 637                         *status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
 638         } else {
 639                 dprintk("%s() Checking QAM\n", __func__);
 640                 reg = au8522_readreg(state, 0x4541);
 641                 if (reg & 0x80)
 642                         *status |= FE_HAS_VITERBI;
 643                 if (reg & 0x20)
 644                         *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 645         }
 646
 647         switch (state->config->status_mode) {
 648         case AU8522_DEMODLOCKING:
 649                 dprintk("%s() DEMODLOCKING\n", __func__);
 650                 if (*status & FE_HAS_VITERBI)
 651                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 652                 break;
 653         case AU8522_TUNERLOCKING:
 654                 /* Get the tuner status */
 655                 dprintk("%s() TUNERLOCKING\n", __func__);
 656                 if (fe->ops.tuner_ops.get_status) {
 657                         if (fe->ops.i2c_gate_ctrl)
 658                                 fe->ops.i2c_gate_ctrl(fe, 1);
 659
 660                         fe->ops.tuner_ops.get_status(fe, &tuner_status);
 661
 662                         if (fe->ops.i2c_gate_ctrl)
 663                                 fe->ops.i2c_gate_ctrl(fe, 0);
 664                 }
 665                 if (tuner_status)
 666                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 667                 break;
 668         }
 669         state->fe_status = *status;
 670
 671         if (*status & FE_HAS_LOCK)
 672                 /* turn on LED, if it isn't on already */
 673                 au8522_led_ctrl(state, -1);
 674         else
 675                 /* turn off LED */
 676                 au8522_led_ctrl(state, 0);
 677
 678         dprintk("%s() status 0x%08x\n", __func__, *status);
 679
 680         return 0;
 681 }
 682
 683 static int au8522_led_status(struct au8522_state *state, const u16 *snr)
 684 {
 685         struct au8522_led_config *led_config = state->config->led_cfg;
 686         int led;
 687         u16 strong;
 688
 689         /* bail out if we cant control an LED */
 690         if (!led_config)
 691                 return 0;
 692
 693         if (0 == (state->fe_status & FE_HAS_LOCK))
 694                 return au8522_led_ctrl(state, 0);
 695         else if (state->current_modulation == QAM_256)
 696                 strong = led_config->qam256_strong;
 697         else if (state->current_modulation == QAM_64)
 698                 strong = led_config->qam64_strong;
 699         else /* (state->current_modulation == VSB_8) */
 700                 strong = led_config->vsb8_strong;
 701
 702         if (*snr >= strong)
 703                 led = 2;
 704         else
 705                 led = 1;
 706
 707         if ((state->led_state) &&
 708             (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
 709                 /* snr didn't change enough to bother
 710                  * changing the color of the led */
 711                 return 0;
 712
 713         return au8522_led_ctrl(state, led);
 714 }
 715
 716 static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
 717 {
 718         struct au8522_state *state = fe->demodulator_priv;
 719         int ret = -EINVAL;
 720
 721         dprintk("%s()\n", __func__);
 722
 723         if (state->current_modulation == QAM_256)
 724                 ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
 725                                             ARRAY_SIZE(qam256_mse2snr_tab),
 726                                             au8522_readreg(state, 0x4522),
 727                                             snr);
 728         else if (state->current_modulation == QAM_64)
 729                 ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
 730                                             ARRAY_SIZE(qam64_mse2snr_tab),
 731                                             au8522_readreg(state, 0x4522),
 732                                             snr);
 733         else /* VSB_8 */
 734                 ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
 735                                             ARRAY_SIZE(vsb_mse2snr_tab),
 736                                             au8522_readreg(state, 0x4311),
 737                                             snr);
 738
 739         if (state->config->led_cfg)
 740                 au8522_led_status(state, snr);
 741
 742         return ret;
 743 }
 744
 745 static int au8522_read_signal_strength(struct dvb_frontend *fe,
 746                                        u16 *signal_strength)
 747 {
 748         return au8522_read_snr(fe, signal_strength);
 749 }
 750
 751 static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 752 {
 753         struct au8522_state *state = fe->demodulator_priv;
 754
 755         if (state->current_modulation == VSB_8)
 756                 *ucblocks = au8522_readreg(state, 0x4087);
 757         else
 758                 *ucblocks = au8522_readreg(state, 0x4543);
 759
 760         return 0;
 761 }
 762
 763 static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
 764 {
 765         return au8522_read_ucblocks(fe, ber);
 766 }
 767
 768 static int au8522_get_frontend(struct dvb_frontend *fe,
 769                                 struct dvb_frontend_parameters *p)
 770 {
 771         struct au8522_state *state = fe->demodulator_priv;
 772
 773         p->frequency = state->current_frequency;
 774         p->u.vsb.modulation = state->current_modulation;
 775
 776         return 0;
 777 }
 778
 779 static int au8522_get_tune_settings(struct dvb_frontend *fe,
 780                                     struct dvb_frontend_tune_settings *tune)
 781 {
 782         tune->min_delay_ms = 1000;
 783         return 0;
 784 }
 785
 786 static void au8522_release(struct dvb_frontend *fe)
 787 {
 788         struct au8522_state *state = fe->demodulator_priv;
 789         kfree(state);
 790 }
 791
 792 static struct dvb_frontend_ops au8522_ops;
 793
 794 struct dvb_frontend *au8522_attach(const struct au8522_config *config,
 795                                    struct i2c_adapter *i2c)
 796 {
 797         struct au8522_state *state = NULL;
 798
 799         /* allocate memory for the internal state */
 800         state = kmalloc(sizeof(struct au8522_state), GFP_KERNEL);
 801         if (state == NULL)
 802                 goto error;
 803
 804         /* setup the state */
 805         state->config = config;
 806         state->i2c = i2c;
 807         /* create dvb_frontend */
 808         memcpy(&state->frontend.ops, &au8522_ops,
 809                sizeof(struct dvb_frontend_ops));
 810         state->frontend.demodulator_priv = state;
 811
 812         if (au8522_init(&state->frontend) != 0) {
 813                 printk(KERN_ERR "%s: Failed to initialize correctly\n",
 814                         __func__);
 815                 goto error;
 816         }
 817
 818         /* Note: Leaving the I2C gate open here. */
 819         au8522_i2c_gate_ctrl(&state->frontend, 1);
 820
 821         return &state->frontend;
 822
 823 error:
 824         kfree(state);
 825         return NULL;
 826 }
 827 EXPORT_SYMBOL(au8522_attach);
 828
 829 static struct dvb_frontend_ops au8522_ops = {
 830
 831         .info = {
 832                 .name                   = "Auvitek AU8522 QAM/8VSB Frontend",
 833                 .type                   = FE_ATSC,
 834                 .frequency_min          = 54000000,
 835                 .frequency_max          = 858000000,
 836                 .frequency_stepsize     = 62500,
 837                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 838         },
 839
 840         .init                 = au8522_init,
 841         .sleep                = au8522_sleep,
 842         .i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 843         .set_frontend         = au8522_set_frontend,
 844         .get_frontend         = au8522_get_frontend,
 845         .get_tune_settings    = au8522_get_tune_settings,
 846         .read_status          = au8522_read_status,
 847         .read_ber             = au8522_read_ber,
 848         .read_signal_strength = au8522_read_signal_strength,
 849         .read_snr             = au8522_read_snr,
 850         .read_ucblocks        = au8522_read_ucblocks,
 851         .release              = au8522_release,
 852 };
 853
 854 module_param(debug, int, 0644);
 855 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 856
 857 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
 858 MODULE_AUTHOR("Steven Toth");
 859 MODULE_LICENSE("GPL");