drivers/media/dvb-frontends/au8522_dig.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     Auvitek AU8522 QAM/8VSB demodulator driver
   4
   5     Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
   6
   7
   8 */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/string.h>
  14 #include <linux/delay.h>
  15 #include <media/dvb_frontend.h>
  16 #include "au8522.h"
  17 #include "au8522_priv.h"
  18
  19 static int debug;
  20 static int zv_mode = 1; /* default to on */
  21
  22 #define dprintk(arg...)\
  23         do { if (debug)\
  24                 printk(arg);\
  25         } while (0)
  26
  27 struct mse2snr_tab {
  28         u16 val;
  29         u16 data;
  30 };
  31
  32 /* VSB SNR lookup table */
  33 static struct mse2snr_tab vsb_mse2snr_tab[] = {
  34         {   0, 270 },
  35         {   2, 250 },
  36         {   3, 240 },
  37         {   5, 230 },
  38         {   7, 220 },
  39         {   9, 210 },
  40         {  12, 200 },
  41         {  13, 195 },
  42         {  15, 190 },
  43         {  17, 185 },
  44         {  19, 180 },
  45         {  21, 175 },
  46         {  24, 170 },
  47         {  27, 165 },
  48         {  31, 160 },
  49         {  32, 158 },
  50         {  33, 156 },
  51         {  36, 152 },
  52         {  37, 150 },
  53         {  39, 148 },
  54         {  40, 146 },
  55         {  41, 144 },
  56         {  43, 142 },
  57         {  44, 140 },
  58         {  48, 135 },
  59         {  50, 130 },
  60         {  43, 142 },
  61         {  53, 125 },
  62         {  56, 120 },
  63         { 256, 115 },
  64 };
  65
  66 /* QAM64 SNR lookup table */
  67 static struct mse2snr_tab qam64_mse2snr_tab[] = {
  68         {  15,   0 },
  69         {  16, 290 },
  70         {  17, 288 },
  71         {  18, 286 },
  72         {  19, 284 },
  73         {  20, 282 },
  74         {  21, 281 },
  75         {  22, 279 },
  76         {  23, 277 },
  77         {  24, 275 },
  78         {  25, 273 },
  79         {  26, 271 },
  80         {  27, 269 },
  81         {  28, 268 },
  82         {  29, 266 },
  83         {  30, 264 },
  84         {  31, 262 },
  85         {  32, 260 },
  86         {  33, 259 },
  87         {  34, 258 },
  88         {  35, 256 },
  89         {  36, 255 },
  90         {  37, 254 },
  91         {  38, 252 },
  92         {  39, 251 },
  93         {  40, 250 },
  94         {  41, 249 },
  95         {  42, 248 },
  96         {  43, 246 },
  97         {  44, 245 },
  98         {  45, 244 },
  99         {  46, 242 },
 100         {  47, 241 },
 101         {  48, 240 },
 102         {  50, 239 },
 103         {  51, 238 },
 104         {  53, 237 },
 105         {  54, 236 },
 106         {  56, 235 },
 107         {  57, 234 },
 108         {  59, 233 },
 109         {  60, 232 },
 110         {  62, 231 },
 111         {  63, 230 },
 112         {  65, 229 },
 113         {  67, 228 },
 114         {  68, 227 },
 115         {  70, 226 },
 116         {  71, 225 },
 117         {  73, 224 },
 118         {  74, 223 },
 119         {  76, 222 },
 120         {  78, 221 },
 121         {  80, 220 },
 122         {  82, 219 },
 123         {  85, 218 },
 124         {  88, 217 },
 125         {  90, 216 },
 126         {  92, 215 },
 127         {  93, 214 },
 128         {  94, 212 },
 129         {  95, 211 },
 130         {  97, 210 },
 131         {  99, 209 },
 132         { 101, 208 },
 133         { 102, 207 },
 134         { 104, 206 },
 135         { 107, 205 },
 136         { 111, 204 },
 137         { 114, 203 },
 138         { 118, 202 },
 139         { 122, 201 },
 140         { 125, 200 },
 141         { 128, 199 },
 142         { 130, 198 },
 143         { 132, 197 },
 144         { 256, 190 },
 145 };
 146
 147 /* QAM256 SNR lookup table */
 148 static struct mse2snr_tab qam256_mse2snr_tab[] = {
 149         {  15,   0 },
 150         {  16, 400 },
 151         {  17, 398 },
 152         {  18, 396 },
 153         {  19, 394 },
 154         {  20, 392 },
 155         {  21, 390 },
 156         {  22, 388 },
 157         {  23, 386 },
 158         {  24, 384 },
 159         {  25, 382 },
 160         {  26, 380 },
 161         {  27, 379 },
 162         {  28, 378 },
 163         {  29, 377 },
 164         {  30, 376 },
 165         {  31, 375 },
 166         {  32, 374 },
 167         {  33, 373 },
 168         {  34, 372 },
 169         {  35, 371 },
 170         {  36, 370 },
 171         {  37, 362 },
 172         {  38, 354 },
 173         {  39, 346 },
 174         {  40, 338 },
 175         {  41, 330 },
 176         {  42, 328 },
 177         {  43, 326 },
 178         {  44, 324 },
 179         {  45, 322 },
 180         {  46, 320 },
 181         {  47, 319 },
 182         {  48, 318 },
 183         {  49, 317 },
 184         {  50, 316 },
 185         {  51, 315 },
 186         {  52, 314 },
 187         {  53, 313 },
 188         {  54, 312 },
 189         {  55, 311 },
 190         {  56, 310 },
 191         {  57, 308 },
 192         {  58, 306 },
 193         {  59, 304 },
 194         {  60, 302 },
 195         {  61, 300 },
 196         {  62, 298 },
 197         {  65, 295 },
 198         {  68, 294 },
 199         {  70, 293 },
 200         {  73, 292 },
 201         {  76, 291 },
 202         {  78, 290 },
 203         {  79, 289 },
 204         {  81, 288 },
 205         {  82, 287 },
 206         {  83, 286 },
 207         {  84, 285 },
 208         {  85, 284 },
 209         {  86, 283 },
 210         {  88, 282 },
 211         {  89, 281 },
 212         { 256, 280 },
 213 };
 214
 215 static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
 216                                  u16 *snr)
 217 {
 218         int i, ret = -EINVAL;
 219         dprintk("%s()\n", __func__);
 220
 221         for (i = 0; i < sz; i++) {
 222                 if (mse < tab[i].val) {
 223                         *snr = tab[i].data;
 224                         ret = 0;
 225                         break;
 226                 }
 227         }
 228         dprintk("%s() snr=%d\n", __func__, *snr);
 229         return ret;
 230 }
 231
 232 static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
 233 {
 234         struct au8522_state *state = fe->demodulator_priv;
 235         u8 r0b5, r0b6, r0b7;
 236         char *ifmhz;
 237
 238         switch (if_freq) {
 239         case AU8522_IF_3_25MHZ:
 240                 ifmhz = "3.25";
 241                 r0b5 = 0x00;
 242                 r0b6 = 0x3d;
 243                 r0b7 = 0xa0;
 244                 break;
 245         case AU8522_IF_4MHZ:
 246                 ifmhz = "4.00";
 247                 r0b5 = 0x00;
 248                 r0b6 = 0x4b;
 249                 r0b7 = 0xd9;
 250                 break;
 251         case AU8522_IF_6MHZ:
 252                 ifmhz = "6.00";
 253                 r0b5 = 0xfb;
 254                 r0b6 = 0x8e;
 255                 r0b7 = 0x39;
 256                 break;
 257         default:
 258                 dprintk("%s() IF Frequency not supported\n", __func__);
 259                 return -EINVAL;
 260         }
 261         dprintk("%s() %s MHz\n", __func__, ifmhz);
 262         au8522_writereg(state, 0x00b5, r0b5);
 263         au8522_writereg(state, 0x00b6, r0b6);
 264         au8522_writereg(state, 0x00b7, r0b7);
 265
 266         return 0;
 267 }
 268
 269 /* VSB Modulation table */
 270 static struct {
 271         u16 reg;
 272         u16 data;
 273 } VSB_mod_tab[] = {
 274         { 0x0090, 0x84 },
 275         { 0x2005, 0x00 },
 276         { 0x0091, 0x80 },
 277         { 0x00a3, 0x0c },
 278         { 0x00a4, 0xe8 },
 279         { 0x0081, 0xc4 },
 280         { 0x00a5, 0x40 },
 281         { 0x00a7, 0x40 },
 282         { 0x00a6, 0x67 },
 283         { 0x0262, 0x20 },
 284         { 0x021c, 0x30 },
 285         { 0x00d8, 0x1a },
 286         { 0x0227, 0xa0 },
 287         { 0x0121, 0xff },
 288         { 0x00a8, 0xf0 },
 289         { 0x00a9, 0x05 },
 290         { 0x00aa, 0x77 },
 291         { 0x00ab, 0xf0 },
 292         { 0x00ac, 0x05 },
 293         { 0x00ad, 0x77 },
 294         { 0x00ae, 0x41 },
 295         { 0x00af, 0x66 },
 296         { 0x021b, 0xcc },
 297         { 0x021d, 0x80 },
 298         { 0x00a4, 0xe8 },
 299         { 0x0231, 0x13 },
 300 };
 301
 302 /* QAM64 Modulation table */
 303 static struct {
 304         u16 reg;
 305         u16 data;
 306 } QAM64_mod_tab[] = {
 307         { 0x00a3, 0x09 },
 308         { 0x00a4, 0x00 },
 309         { 0x0081, 0xc4 },
 310         { 0x00a5, 0x40 },
 311         { 0x00aa, 0x77 },
 312         { 0x00ad, 0x77 },
 313         { 0x00a6, 0x67 },
 314         { 0x0262, 0x20 },
 315         { 0x021c, 0x30 },
 316         { 0x00b8, 0x3e },
 317         { 0x00b9, 0xf0 },
 318         { 0x00ba, 0x01 },
 319         { 0x00bb, 0x18 },
 320         { 0x00bc, 0x50 },
 321         { 0x00bd, 0x00 },
 322         { 0x00be, 0xea },
 323         { 0x00bf, 0xef },
 324         { 0x00c0, 0xfc },
 325         { 0x00c1, 0xbd },
 326         { 0x00c2, 0x1f },
 327         { 0x00c3, 0xfc },
 328         { 0x00c4, 0xdd },
 329         { 0x00c5, 0xaf },
 330         { 0x00c6, 0x00 },
 331         { 0x00c7, 0x38 },
 332         { 0x00c8, 0x30 },
 333         { 0x00c9, 0x05 },
 334         { 0x00ca, 0x4a },
 335         { 0x00cb, 0xd0 },
 336         { 0x00cc, 0x01 },
 337         { 0x00cd, 0xd9 },
 338         { 0x00ce, 0x6f },
 339         { 0x00cf, 0xf9 },
 340         { 0x00d0, 0x70 },
 341         { 0x00d1, 0xdf },
 342         { 0x00d2, 0xf7 },
 343         { 0x00d3, 0xc2 },
 344         { 0x00d4, 0xdf },
 345         { 0x00d5, 0x02 },
 346         { 0x00d6, 0x9a },
 347         { 0x00d7, 0xd0 },
 348         { 0x0250, 0x0d },
 349         { 0x0251, 0xcd },
 350         { 0x0252, 0xe0 },
 351         { 0x0253, 0x05 },
 352         { 0x0254, 0xa7 },
 353         { 0x0255, 0xff },
 354         { 0x0256, 0xed },
 355         { 0x0257, 0x5b },
 356         { 0x0258, 0xae },
 357         { 0x0259, 0xe6 },
 358         { 0x025a, 0x3d },
 359         { 0x025b, 0x0f },
 360         { 0x025c, 0x0d },
 361         { 0x025d, 0xea },
 362         { 0x025e, 0xf2 },
 363         { 0x025f, 0x51 },
 364         { 0x0260, 0xf5 },
 365         { 0x0261, 0x06 },
 366         { 0x021a, 0x00 },
 367         { 0x0546, 0x40 },
 368         { 0x0210, 0xc7 },
 369         { 0x0211, 0xaa },
 370         { 0x0212, 0xab },
 371         { 0x0213, 0x02 },
 372         { 0x0502, 0x00 },
 373         { 0x0121, 0x04 },
 374         { 0x0122, 0x04 },
 375         { 0x052e, 0x10 },
 376         { 0x00a4, 0xca },
 377         { 0x00a7, 0x40 },
 378         { 0x0526, 0x01 },
 379 };
 380
 381 /* QAM256 Modulation table */
 382 static struct {
 383         u16 reg;
 384         u16 data;
 385 } QAM256_mod_tab[] = {
 386         { 0x00a3, 0x09 },
 387         { 0x00a4, 0x00 },
 388         { 0x0081, 0xc4 },
 389         { 0x00a5, 0x40 },
 390         { 0x00aa, 0x77 },
 391         { 0x00ad, 0x77 },
 392         { 0x00a6, 0x67 },
 393         { 0x0262, 0x20 },
 394         { 0x021c, 0x30 },
 395         { 0x00b8, 0x3e },
 396         { 0x00b9, 0xf0 },
 397         { 0x00ba, 0x01 },
 398         { 0x00bb, 0x18 },
 399         { 0x00bc, 0x50 },
 400         { 0x00bd, 0x00 },
 401         { 0x00be, 0xea },
 402         { 0x00bf, 0xef },
 403         { 0x00c0, 0xfc },
 404         { 0x00c1, 0xbd },
 405         { 0x00c2, 0x1f },
 406         { 0x00c3, 0xfc },
 407         { 0x00c4, 0xdd },
 408         { 0x00c5, 0xaf },
 409         { 0x00c6, 0x00 },
 410         { 0x00c7, 0x38 },
 411         { 0x00c8, 0x30 },
 412         { 0x00c9, 0x05 },
 413         { 0x00ca, 0x4a },
 414         { 0x00cb, 0xd0 },
 415         { 0x00cc, 0x01 },
 416         { 0x00cd, 0xd9 },
 417         { 0x00ce, 0x6f },
 418         { 0x00cf, 0xf9 },
 419         { 0x00d0, 0x70 },
 420         { 0x00d1, 0xdf },
 421         { 0x00d2, 0xf7 },
 422         { 0x00d3, 0xc2 },
 423         { 0x00d4, 0xdf },
 424         { 0x00d5, 0x02 },
 425         { 0x00d6, 0x9a },
 426         { 0x00d7, 0xd0 },
 427         { 0x0250, 0x0d },
 428         { 0x0251, 0xcd },
 429         { 0x0252, 0xe0 },
 430         { 0x0253, 0x05 },
 431         { 0x0254, 0xa7 },
 432         { 0x0255, 0xff },
 433         { 0x0256, 0xed },
 434         { 0x0257, 0x5b },
 435         { 0x0258, 0xae },
 436         { 0x0259, 0xe6 },
 437         { 0x025a, 0x3d },
 438         { 0x025b, 0x0f },
 439         { 0x025c, 0x0d },
 440         { 0x025d, 0xea },
 441         { 0x025e, 0xf2 },
 442         { 0x025f, 0x51 },
 443         { 0x0260, 0xf5 },
 444         { 0x0261, 0x06 },
 445         { 0x021a, 0x00 },
 446         { 0x0546, 0x40 },
 447         { 0x0210, 0x26 },
 448         { 0x0211, 0xf6 },
 449         { 0x0212, 0x84 },
 450         { 0x0213, 0x02 },
 451         { 0x0502, 0x01 },
 452         { 0x0121, 0x04 },
 453         { 0x0122, 0x04 },
 454         { 0x052e, 0x10 },
 455         { 0x00a4, 0xca },
 456         { 0x00a7, 0x40 },
 457         { 0x0526, 0x01 },
 458 };
 459
 460 static struct {
 461         u16 reg;
 462         u16 data;
 463 } QAM256_mod_tab_zv_mode[] = {
 464         { 0x80a3, 0x09 },
 465         { 0x80a4, 0x00 },
 466         { 0x8081, 0xc4 },
 467         { 0x80a5, 0x40 },
 468         { 0x80b5, 0xfb },
 469         { 0x80b6, 0x8e },
 470         { 0x80b7, 0x39 },
 471         { 0x80aa, 0x77 },
 472         { 0x80ad, 0x77 },
 473         { 0x80a6, 0x67 },
 474         { 0x8262, 0x20 },
 475         { 0x821c, 0x30 },
 476         { 0x80b8, 0x3e },
 477         { 0x80b9, 0xf0 },
 478         { 0x80ba, 0x01 },
 479         { 0x80bb, 0x18 },
 480         { 0x80bc, 0x50 },
 481         { 0x80bd, 0x00 },
 482         { 0x80be, 0xea },
 483         { 0x80bf, 0xef },
 484         { 0x80c0, 0xfc },
 485         { 0x80c1, 0xbd },
 486         { 0x80c2, 0x1f },
 487         { 0x80c3, 0xfc },
 488         { 0x80c4, 0xdd },
 489         { 0x80c5, 0xaf },
 490         { 0x80c6, 0x00 },
 491         { 0x80c7, 0x38 },
 492         { 0x80c8, 0x30 },
 493         { 0x80c9, 0x05 },
 494         { 0x80ca, 0x4a },
 495         { 0x80cb, 0xd0 },
 496         { 0x80cc, 0x01 },
 497         { 0x80cd, 0xd9 },
 498         { 0x80ce, 0x6f },
 499         { 0x80cf, 0xf9 },
 500         { 0x80d0, 0x70 },
 501         { 0x80d1, 0xdf },
 502         { 0x80d2, 0xf7 },
 503         { 0x80d3, 0xc2 },
 504         { 0x80d4, 0xdf },
 505         { 0x80d5, 0x02 },
 506         { 0x80d6, 0x9a },
 507         { 0x80d7, 0xd0 },
 508         { 0x8250, 0x0d },
 509         { 0x8251, 0xcd },
 510         { 0x8252, 0xe0 },
 511         { 0x8253, 0x05 },
 512         { 0x8254, 0xa7 },
 513         { 0x8255, 0xff },
 514         { 0x8256, 0xed },
 515         { 0x8257, 0x5b },
 516         { 0x8258, 0xae },
 517         { 0x8259, 0xe6 },
 518         { 0x825a, 0x3d },
 519         { 0x825b, 0x0f },
 520         { 0x825c, 0x0d },
 521         { 0x825d, 0xea },
 522         { 0x825e, 0xf2 },
 523         { 0x825f, 0x51 },
 524         { 0x8260, 0xf5 },
 525         { 0x8261, 0x06 },
 526         { 0x821a, 0x01 },
 527         { 0x8546, 0x40 },
 528         { 0x8210, 0x26 },
 529         { 0x8211, 0xf6 },
 530         { 0x8212, 0x84 },
 531         { 0x8213, 0x02 },
 532         { 0x8502, 0x01 },
 533         { 0x8121, 0x04 },
 534         { 0x8122, 0x04 },
 535         { 0x852e, 0x10 },
 536         { 0x80a4, 0xca },
 537         { 0x80a7, 0x40 },
 538         { 0x8526, 0x01 },
 539 };
 540
 541 static int au8522_enable_modulation(struct dvb_frontend *fe,
 542                                     enum fe_modulation m)
 543 {
 544         struct au8522_state *state = fe->demodulator_priv;
 545         int i;
 546
 547         dprintk("%s(0x%08x)\n", __func__, m);
 548
 549         switch (m) {
 550         case VSB_8:
 551                 dprintk("%s() VSB_8\n", __func__);
 552                 for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
 553                         au8522_writereg(state,
 554                                 VSB_mod_tab[i].reg,
 555                                 VSB_mod_tab[i].data);
 556                 au8522_set_if(fe, state->config.vsb_if);
 557                 break;
 558         case QAM_64:
 559                 dprintk("%s() QAM 64\n", __func__);
 560                 for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
 561                         au8522_writereg(state,
 562                                 QAM64_mod_tab[i].reg,
 563                                 QAM64_mod_tab[i].data);
 564                 au8522_set_if(fe, state->config.qam_if);
 565                 break;
 566         case QAM_256:
 567                 if (zv_mode) {
 568                         dprintk("%s() QAM 256 (zv_mode)\n", __func__);
 569                         for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab_zv_mode); i++)
 570                                 au8522_writereg(state,
 571                                         QAM256_mod_tab_zv_mode[i].reg,
 572                                         QAM256_mod_tab_zv_mode[i].data);
 573                         au8522_set_if(fe, state->config.qam_if);
 574                         msleep(100);
 575                         au8522_writereg(state, 0x821a, 0x00);
 576                 } else {
 577                         dprintk("%s() QAM 256\n", __func__);
 578                         for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
 579                                 au8522_writereg(state,
 580                                         QAM256_mod_tab[i].reg,
 581                                         QAM256_mod_tab[i].data);
 582                         au8522_set_if(fe, state->config.qam_if);
 583                 }
 584                 break;
 585         default:
 586                 dprintk("%s() Invalid modulation\n", __func__);
 587                 return -EINVAL;
 588         }
 589
 590         state->current_modulation = m;
 591
 592         return 0;
 593 }
 594
 595 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 596 static int au8522_set_frontend(struct dvb_frontend *fe)
 597 {
 598         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 599         struct au8522_state *state = fe->demodulator_priv;
 600         int ret = -EINVAL;
 601
 602         dprintk("%s(frequency=%d)\n", __func__, c->frequency);
 603
 604         if ((state->current_frequency == c->frequency) &&
 605             (state->current_modulation == c->modulation))
 606                 return 0;
 607
 608         if (fe->ops.tuner_ops.set_params) {
 609                 if (fe->ops.i2c_gate_ctrl)
 610                         fe->ops.i2c_gate_ctrl(fe, 1);
 611                 ret = fe->ops.tuner_ops.set_params(fe);
 612                 if (fe->ops.i2c_gate_ctrl)
 613                         fe->ops.i2c_gate_ctrl(fe, 0);
 614         }
 615
 616         if (ret < 0)
 617                 return ret;
 618
 619         /* Allow the tuner to settle */
 620         if (zv_mode) {
 621                 dprintk("%s() increase tuner settling time for zv_mode\n",
 622                         __func__);
 623                 msleep(250);
 624         } else
 625                 msleep(100);
 626
 627         au8522_enable_modulation(fe, c->modulation);
 628
 629         state->current_frequency = c->frequency;
 630
 631         return 0;
 632 }
 633
 634 static int au8522_read_status(struct dvb_frontend *fe, enum fe_status *status)
 635 {
 636         struct au8522_state *state = fe->demodulator_priv;
 637         u8 reg;
 638         u32 tuner_status = 0;
 639
 640         *status = 0;
 641
 642         if (state->current_modulation == VSB_8) {
 643                 dprintk("%s() Checking VSB_8\n", __func__);
 644                 reg = au8522_readreg(state, 0x0088);
 645                 if ((reg & 0x03) == 0x03)
 646                         *status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
 647         } else {
 648                 dprintk("%s() Checking QAM\n", __func__);
 649                 reg = au8522_readreg(state, 0x0541);
 650                 if (reg & 0x80)
 651                         *status |= FE_HAS_VITERBI;
 652                 if (reg & 0x20)
 653                         *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 654         }
 655
 656         switch (state->config.status_mode) {
 657         case AU8522_DEMODLOCKING:
 658                 dprintk("%s() DEMODLOCKING\n", __func__);
 659                 if (*status & FE_HAS_VITERBI)
 660                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 661                 break;
 662         case AU8522_TUNERLOCKING:
 663                 /* Get the tuner status */
 664                 dprintk("%s() TUNERLOCKING\n", __func__);
 665                 if (fe->ops.tuner_ops.get_status) {
 666                         if (fe->ops.i2c_gate_ctrl)
 667                                 fe->ops.i2c_gate_ctrl(fe, 1);
 668
 669                         fe->ops.tuner_ops.get_status(fe, &tuner_status);
 670
 671                         if (fe->ops.i2c_gate_ctrl)
 672                                 fe->ops.i2c_gate_ctrl(fe, 0);
 673                 }
 674                 if (tuner_status)
 675                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 676                 break;
 677         }
 678         state->fe_status = *status;
 679
 680         if (*status & FE_HAS_LOCK)
 681                 /* turn on LED, if it isn't on already */
 682                 au8522_led_ctrl(state, -1);
 683         else
 684                 /* turn off LED */
 685                 au8522_led_ctrl(state, 0);
 686
 687         dprintk("%s() status 0x%08x\n", __func__, *status);
 688
 689         return 0;
 690 }
 691
 692 static int au8522_led_status(struct au8522_state *state, const u16 *snr)
 693 {
 694         struct au8522_led_config *led_config = state->config.led_cfg;
 695         int led;
 696         u16 strong;
 697
 698         /* bail out if we can't control an LED */
 699         if (!led_config)
 700                 return 0;
 701
 702         if (0 == (state->fe_status & FE_HAS_LOCK))
 703                 return au8522_led_ctrl(state, 0);
 704         else if (state->current_modulation == QAM_256)
 705                 strong = led_config->qam256_strong;
 706         else if (state->current_modulation == QAM_64)
 707                 strong = led_config->qam64_strong;
 708         else /* (state->current_modulation == VSB_8) */
 709                 strong = led_config->vsb8_strong;
 710
 711         if (*snr >= strong)
 712                 led = 2;
 713         else
 714                 led = 1;
 715
 716         if ((state->led_state) &&
 717             (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
 718                 /* snr didn't change enough to bother
 719                  * changing the color of the led */
 720                 return 0;
 721
 722         return au8522_led_ctrl(state, led);
 723 }
 724
 725 static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
 726 {
 727         struct au8522_state *state = fe->demodulator_priv;
 728         int ret = -EINVAL;
 729
 730         dprintk("%s()\n", __func__);
 731
 732         if (state->current_modulation == QAM_256)
 733                 ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
 734                                             ARRAY_SIZE(qam256_mse2snr_tab),
 735                                             au8522_readreg(state, 0x0522),
 736                                             snr);
 737         else if (state->current_modulation == QAM_64)
 738                 ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
 739                                             ARRAY_SIZE(qam64_mse2snr_tab),
 740                                             au8522_readreg(state, 0x0522),
 741                                             snr);
 742         else /* VSB_8 */
 743                 ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
 744                                             ARRAY_SIZE(vsb_mse2snr_tab),
 745                                             au8522_readreg(state, 0x0311),
 746                                             snr);
 747
 748         if (state->config.led_cfg)
 749                 au8522_led_status(state, snr);
 750
 751         return ret;
 752 }
 753
 754 static int au8522_read_signal_strength(struct dvb_frontend *fe,
 755                                        u16 *signal_strength)
 756 {
 757         /* borrowed from lgdt330x.c
 758          *
 759          * Calculate strength from SNR up to 35dB
 760          * Even though the SNR can go higher than 35dB,
 761          * there is some comfort factor in having a range of
 762          * strong signals that can show at 100%
 763          */
 764         u16 snr;
 765         u32 tmp;
 766         int ret = au8522_read_snr(fe, &snr);
 767
 768         *signal_strength = 0;
 769
 770         if (0 == ret) {
 771                 /* The following calculation method was chosen
 772                  * purely for the sake of code re-use from the
 773                  * other demod drivers that use this method */
 774
 775                 /* Convert from SNR in dB * 10 to 8.24 fixed-point */
 776                 tmp = (snr * ((1 << 24) / 10));
 777
 778                 /* Convert from 8.24 fixed-point to
 779                  * scale the range 0 - 35*2^24 into 0 - 65535*/
 780                 if (tmp >= 8960 * 0x10000)
 781                         *signal_strength = 0xffff;
 782                 else
 783                         *signal_strength = tmp / 8960;
 784         }
 785
 786         return ret;
 787 }
 788
 789 static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 790 {
 791         struct au8522_state *state = fe->demodulator_priv;
 792
 793         if (state->current_modulation == VSB_8)
 794                 *ucblocks = au8522_readreg(state, 0x0087);
 795         else
 796                 *ucblocks = au8522_readreg(state, 0x0543);
 797
 798         return 0;
 799 }
 800
 801 static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
 802 {
 803         return au8522_read_ucblocks(fe, ber);
 804 }
 805
 806 static int au8522_get_frontend(struct dvb_frontend *fe,
 807                                struct dtv_frontend_properties *c)
 808 {
 809         struct au8522_state *state = fe->demodulator_priv;
 810
 811         c->frequency = state->current_frequency;
 812         c->modulation = state->current_modulation;
 813
 814         return 0;
 815 }
 816
 817 static int au8522_get_tune_settings(struct dvb_frontend *fe,
 818                                     struct dvb_frontend_tune_settings *tune)
 819 {
 820         tune->min_delay_ms = 1000;
 821         return 0;
 822 }
 823
 824 static const struct dvb_frontend_ops au8522_ops;
 825
 826
 827 static void au8522_release(struct dvb_frontend *fe)
 828 {
 829         struct au8522_state *state = fe->demodulator_priv;
 830         au8522_release_state(state);
 831 }
 832
 833 struct dvb_frontend *au8522_attach(const struct au8522_config *config,
 834                                    struct i2c_adapter *i2c)
 835 {
 836         struct au8522_state *state = NULL;
 837         int instance;
 838
 839         /* allocate memory for the internal state */
 840         instance = au8522_get_state(&state, i2c, config->demod_address);
 841         switch (instance) {
 842         case 0:
 843                 dprintk("%s state allocation failed\n", __func__);
 844                 break;
 845         case 1:
 846                 /* new demod instance */
 847                 dprintk("%s using new instance\n", __func__);
 848                 break;
 849         default:
 850                 /* existing demod instance */
 851                 dprintk("%s using existing instance\n", __func__);
 852                 break;
 853         }
 854
 855         /* setup the state */
 856         state->config = *config;
 857         state->i2c = i2c;
 858         state->operational_mode = AU8522_DIGITAL_MODE;
 859
 860         /* create dvb_frontend */
 861         memcpy(&state->frontend.ops, &au8522_ops,
 862                sizeof(struct dvb_frontend_ops));
 863         state->frontend.demodulator_priv = state;
 864
 865         state->frontend.ops.analog_ops.i2c_gate_ctrl = au8522_analog_i2c_gate_ctrl;
 866
 867         if (au8522_init(&state->frontend) != 0) {
 868                 printk(KERN_ERR "%s: Failed to initialize correctly\n",
 869                         __func__);
 870                 goto error;
 871         }
 872
 873         /* Note: Leaving the I2C gate open here. */
 874         au8522_i2c_gate_ctrl(&state->frontend, 1);
 875
 876         return &state->frontend;
 877
 878 error:
 879         au8522_release_state(state);
 880         return NULL;
 881 }
 882 EXPORT_SYMBOL(au8522_attach);
 883
 884 static const struct dvb_frontend_ops au8522_ops = {
 885         .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
 886         .info = {
 887                 .name                   = "Auvitek AU8522 QAM/8VSB Frontend",
 888                 .frequency_min_hz       =  54 * MHz,
 889                 .frequency_max_hz       = 858 * MHz,
 890                 .frequency_stepsize_hz  = 62500,
 891                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 892         },
 893
 894         .init                 = au8522_init,
 895         .sleep                = au8522_sleep,
 896         .i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 897         .set_frontend         = au8522_set_frontend,
 898         .get_frontend         = au8522_get_frontend,
 899         .get_tune_settings    = au8522_get_tune_settings,
 900         .read_status          = au8522_read_status,
 901         .read_ber             = au8522_read_ber,
 902         .read_signal_strength = au8522_read_signal_strength,
 903         .read_snr             = au8522_read_snr,
 904         .read_ucblocks        = au8522_read_ucblocks,
 905         .release              = au8522_release,
 906 };
 907
 908 module_param(debug, int, 0644);
 909 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 910
 911 module_param(zv_mode, int, 0644);
 912 MODULE_PARM_DESC(zv_mode, "Turn on/off ZeeVee modulator compatibility mode (default:on).\n"
 913         "\t\ton - modified AU8522 QAM256 initialization.\n"
 914         "\t\tProvides faster lock when using ZeeVee modulator based sources");
 915
 916 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
 917 MODULE_AUTHOR("Steven Toth");
 918 MODULE_LICENSE("GPL");