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 /* Despite the name "hybrid_tuner", the framework works just as well for
  35    hybrid demodulators as well... */
  36 static LIST_HEAD(hybrid_tuner_instance_list);
  37 static DEFINE_MUTEX(au8522_list_mutex);
  38
  39 #define dprintk(arg...)\
  40         do { if (debug)\
  41                 printk(arg);\
  42         } while (0)
  43
  44 /* 16 bit registers, 8 bit values */
  45 int au8522_writereg(struct au8522_state *state, u16 reg, u8 data)
  46 {
  47         int ret;
  48         u8 buf[] = { (reg >> 8) | 0x80, reg & 0xff, data };
  49
  50         struct i2c_msg msg = { .addr = state->config->demod_address,
  51                                .flags = 0, .buf = buf, .len = 3 };
  52
  53         ret = i2c_transfer(state->i2c, &msg, 1);
  54
  55         if (ret != 1)
  56                 printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
  57                        "ret == %i)\n", __func__, reg, data, ret);
  58
  59         return (ret != 1) ? -1 : 0;
  60 }
  61
  62 u8 au8522_readreg(struct au8522_state *state, u16 reg)
  63 {
  64         int ret;
  65         u8 b0[] = { (reg >> 8) | 0x40, reg & 0xff };
  66         u8 b1[] = { 0 };
  67
  68         struct i2c_msg msg[] = {
  69                 { .addr = state->config->demod_address, .flags = 0,
  70                   .buf = b0, .len = 2 },
  71                 { .addr = state->config->demod_address, .flags = I2C_M_RD,
  72                   .buf = b1, .len = 1 } };
  73
  74         ret = i2c_transfer(state->i2c, msg, 2);
  75
  76         if (ret != 2)
  77                 printk(KERN_ERR "%s: readreg error (ret == %i)\n",
  78                        __func__, ret);
  79         return b1[0];
  80 }
  81
  82 static int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
  83 {
  84         struct au8522_state *state = fe->demodulator_priv;
  85
  86         dprintk("%s(%d)\n", __func__, enable);
  87
  88         if (enable)
  89                 return au8522_writereg(state, 0x106, 1);
  90         else
  91                 return au8522_writereg(state, 0x106, 0);
  92 }
  93
  94 struct mse2snr_tab {
  95         u16 val;
  96         u16 data;
  97 };
  98
  99 /* VSB SNR lookup table */
 100 static struct mse2snr_tab vsb_mse2snr_tab[] = {
 101         {   0, 270 },
 102         {   2, 250 },
 103         {   3, 240 },
 104         {   5, 230 },
 105         {   7, 220 },
 106         {   9, 210 },
 107         {  12, 200 },
 108         {  13, 195 },
 109         {  15, 190 },
 110         {  17, 185 },
 111         {  19, 180 },
 112         {  21, 175 },
 113         {  24, 170 },
 114         {  27, 165 },
 115         {  31, 160 },
 116         {  32, 158 },
 117         {  33, 156 },
 118         {  36, 152 },
 119         {  37, 150 },
 120         {  39, 148 },
 121         {  40, 146 },
 122         {  41, 144 },
 123         {  43, 142 },
 124         {  44, 140 },
 125         {  48, 135 },
 126         {  50, 130 },
 127         {  43, 142 },
 128         {  53, 125 },
 129         {  56, 120 },
 130         { 256, 115 },
 131 };
 132
 133 /* QAM64 SNR lookup table */
 134 static struct mse2snr_tab qam64_mse2snr_tab[] = {
 135         {  15,   0 },
 136         {  16, 290 },
 137         {  17, 288 },
 138         {  18, 286 },
 139         {  19, 284 },
 140         {  20, 282 },
 141         {  21, 281 },
 142         {  22, 279 },
 143         {  23, 277 },
 144         {  24, 275 },
 145         {  25, 273 },
 146         {  26, 271 },
 147         {  27, 269 },
 148         {  28, 268 },
 149         {  29, 266 },
 150         {  30, 264 },
 151         {  31, 262 },
 152         {  32, 260 },
 153         {  33, 259 },
 154         {  34, 258 },
 155         {  35, 256 },
 156         {  36, 255 },
 157         {  37, 254 },
 158         {  38, 252 },
 159         {  39, 251 },
 160         {  40, 250 },
 161         {  41, 249 },
 162         {  42, 248 },
 163         {  43, 246 },
 164         {  44, 245 },
 165         {  45, 244 },
 166         {  46, 242 },
 167         {  47, 241 },
 168         {  48, 240 },
 169         {  50, 239 },
 170         {  51, 238 },
 171         {  53, 237 },
 172         {  54, 236 },
 173         {  56, 235 },
 174         {  57, 234 },
 175         {  59, 233 },
 176         {  60, 232 },
 177         {  62, 231 },
 178         {  63, 230 },
 179         {  65, 229 },
 180         {  67, 228 },
 181         {  68, 227 },
 182         {  70, 226 },
 183         {  71, 225 },
 184         {  73, 224 },
 185         {  74, 223 },
 186         {  76, 222 },
 187         {  78, 221 },
 188         {  80, 220 },
 189         {  82, 219 },
 190         {  85, 218 },
 191         {  88, 217 },
 192         {  90, 216 },
 193         {  92, 215 },
 194         {  93, 214 },
 195         {  94, 212 },
 196         {  95, 211 },
 197         {  97, 210 },
 198         {  99, 209 },
 199         { 101, 208 },
 200         { 102, 207 },
 201         { 104, 206 },
 202         { 107, 205 },
 203         { 111, 204 },
 204         { 114, 203 },
 205         { 118, 202 },
 206         { 122, 201 },
 207         { 125, 200 },
 208         { 128, 199 },
 209         { 130, 198 },
 210         { 132, 197 },
 211         { 256, 190 },
 212 };
 213
 214 /* QAM256 SNR lookup table */
 215 static struct mse2snr_tab qam256_mse2snr_tab[] = {
 216         {  16,   0 },
 217         {  17, 400 },
 218         {  18, 398 },
 219         {  19, 396 },
 220         {  20, 394 },
 221         {  21, 392 },
 222         {  22, 390 },
 223         {  23, 388 },
 224         {  24, 386 },
 225         {  25, 384 },
 226         {  26, 382 },
 227         {  27, 380 },
 228         {  28, 379 },
 229         {  29, 378 },
 230         {  30, 377 },
 231         {  31, 376 },
 232         {  32, 375 },
 233         {  33, 374 },
 234         {  34, 373 },
 235         {  35, 372 },
 236         {  36, 371 },
 237         {  37, 370 },
 238         {  38, 362 },
 239         {  39, 354 },
 240         {  40, 346 },
 241         {  41, 338 },
 242         {  42, 330 },
 243         {  43, 328 },
 244         {  44, 326 },
 245         {  45, 324 },
 246         {  46, 322 },
 247         {  47, 320 },
 248         {  48, 319 },
 249         {  49, 318 },
 250         {  50, 317 },
 251         {  51, 316 },
 252         {  52, 315 },
 253         {  53, 314 },
 254         {  54, 313 },
 255         {  55, 312 },
 256         {  56, 311 },
 257         {  57, 310 },
 258         {  58, 308 },
 259         {  59, 306 },
 260         {  60, 304 },
 261         {  61, 302 },
 262         {  62, 300 },
 263         {  63, 298 },
 264         {  65, 295 },
 265         {  68, 294 },
 266         {  70, 293 },
 267         {  73, 292 },
 268         {  76, 291 },
 269         {  78, 290 },
 270         {  79, 289 },
 271         {  81, 288 },
 272         {  82, 287 },
 273         {  83, 286 },
 274         {  84, 285 },
 275         {  85, 284 },
 276         {  86, 283 },
 277         {  88, 282 },
 278         {  89, 281 },
 279         { 256, 280 },
 280 };
 281
 282 static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
 283                                  u16 *snr)
 284 {
 285         int i, ret = -EINVAL;
 286         dprintk("%s()\n", __func__);
 287
 288         for (i = 0; i < sz; i++) {
 289                 if (mse < tab[i].val) {
 290                         *snr = tab[i].data;
 291                         ret = 0;
 292                         break;
 293                 }
 294         }
 295         dprintk("%s() snr=%d\n", __func__, *snr);
 296         return ret;
 297 }
 298
 299 static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
 300 {
 301         struct au8522_state *state = fe->demodulator_priv;
 302         u8 r0b5, r0b6, r0b7;
 303         char *ifmhz;
 304
 305         switch (if_freq) {
 306         case AU8522_IF_3_25MHZ:
 307                 ifmhz = "3.25";
 308                 r0b5 = 0x00;
 309                 r0b6 = 0x3d;
 310                 r0b7 = 0xa0;
 311                 break;
 312         case AU8522_IF_4MHZ:
 313                 ifmhz = "4.00";
 314                 r0b5 = 0x00;
 315                 r0b6 = 0x4b;
 316                 r0b7 = 0xd9;
 317                 break;
 318         case AU8522_IF_6MHZ:
 319                 ifmhz = "6.00";
 320                 r0b5 = 0xfb;
 321                 r0b6 = 0x8e;
 322                 r0b7 = 0x39;
 323                 break;
 324         default:
 325                 dprintk("%s() IF Frequency not supported\n", __func__);
 326                 return -EINVAL;
 327         }
 328         dprintk("%s() %s MHz\n", __func__, ifmhz);
 329         au8522_writereg(state, 0x80b5, r0b5);
 330         au8522_writereg(state, 0x80b6, r0b6);
 331         au8522_writereg(state, 0x80b7, r0b7);
 332
 333         return 0;
 334 }
 335
 336 /* VSB Modulation table */
 337 static struct {
 338         u16 reg;
 339         u16 data;
 340 } VSB_mod_tab[] = {
 341         { 0x8090, 0x84 },
 342         { 0x4092, 0x11 },
 343         { 0x2005, 0x00 },
 344         { 0x8091, 0x80 },
 345         { 0x80a3, 0x0c },
 346         { 0x80a4, 0xe8 },
 347         { 0x8081, 0xc4 },
 348         { 0x80a5, 0x40 },
 349         { 0x80a7, 0x40 },
 350         { 0x80a6, 0x67 },
 351         { 0x8262, 0x20 },
 352         { 0x821c, 0x30 },
 353         { 0x80d8, 0x1a },
 354         { 0x8227, 0xa0 },
 355         { 0x8121, 0xff },
 356         { 0x80a8, 0xf0 },
 357         { 0x80a9, 0x05 },
 358         { 0x80aa, 0x77 },
 359         { 0x80ab, 0xf0 },
 360         { 0x80ac, 0x05 },
 361         { 0x80ad, 0x77 },
 362         { 0x80ae, 0x41 },
 363         { 0x80af, 0x66 },
 364         { 0x821b, 0xcc },
 365         { 0x821d, 0x80 },
 366         { 0x80a4, 0xe8 },
 367         { 0x8231, 0x13 },
 368 };
 369
 370 /* QAM64 Modulation table */
 371 static struct {
 372         u16 reg;
 373         u16 data;
 374 } QAM64_mod_tab[] = {
 375         { 0x00a3, 0x09 },
 376         { 0x00a4, 0x00 },
 377         { 0x0081, 0xc4 },
 378         { 0x00a5, 0x40 },
 379         { 0x00aa, 0x77 },
 380         { 0x00ad, 0x77 },
 381         { 0x00a6, 0x67 },
 382         { 0x0262, 0x20 },
 383         { 0x021c, 0x30 },
 384         { 0x00b8, 0x3e },
 385         { 0x00b9, 0xf0 },
 386         { 0x00ba, 0x01 },
 387         { 0x00bb, 0x18 },
 388         { 0x00bc, 0x50 },
 389         { 0x00bd, 0x00 },
 390         { 0x00be, 0xea },
 391         { 0x00bf, 0xef },
 392         { 0x00c0, 0xfc },
 393         { 0x00c1, 0xbd },
 394         { 0x00c2, 0x1f },
 395         { 0x00c3, 0xfc },
 396         { 0x00c4, 0xdd },
 397         { 0x00c5, 0xaf },
 398         { 0x00c6, 0x00 },
 399         { 0x00c7, 0x38 },
 400         { 0x00c8, 0x30 },
 401         { 0x00c9, 0x05 },
 402         { 0x00ca, 0x4a },
 403         { 0x00cb, 0xd0 },
 404         { 0x00cc, 0x01 },
 405         { 0x00cd, 0xd9 },
 406         { 0x00ce, 0x6f },
 407         { 0x00cf, 0xf9 },
 408         { 0x00d0, 0x70 },
 409         { 0x00d1, 0xdf },
 410         { 0x00d2, 0xf7 },
 411         { 0x00d3, 0xc2 },
 412         { 0x00d4, 0xdf },
 413         { 0x00d5, 0x02 },
 414         { 0x00d6, 0x9a },
 415         { 0x00d7, 0xd0 },
 416         { 0x0250, 0x0d },
 417         { 0x0251, 0xcd },
 418         { 0x0252, 0xe0 },
 419         { 0x0253, 0x05 },
 420         { 0x0254, 0xa7 },
 421         { 0x0255, 0xff },
 422         { 0x0256, 0xed },
 423         { 0x0257, 0x5b },
 424         { 0x0258, 0xae },
 425         { 0x0259, 0xe6 },
 426         { 0x025a, 0x3d },
 427         { 0x025b, 0x0f },
 428         { 0x025c, 0x0d },
 429         { 0x025d, 0xea },
 430         { 0x025e, 0xf2 },
 431         { 0x025f, 0x51 },
 432         { 0x0260, 0xf5 },
 433         { 0x0261, 0x06 },
 434         { 0x021a, 0x00 },
 435         { 0x0546, 0x40 },
 436         { 0x0210, 0xc7 },
 437         { 0x0211, 0xaa },
 438         { 0x0212, 0xab },
 439         { 0x0213, 0x02 },
 440         { 0x0502, 0x00 },
 441         { 0x0121, 0x04 },
 442         { 0x0122, 0x04 },
 443         { 0x052e, 0x10 },
 444         { 0x00a4, 0xca },
 445         { 0x00a7, 0x40 },
 446         { 0x0526, 0x01 },
 447 };
 448
 449 /* QAM256 Modulation table */
 450 static struct {
 451         u16 reg;
 452         u16 data;
 453 } QAM256_mod_tab[] = {
 454         { 0x80a3, 0x09 },
 455         { 0x80a4, 0x00 },
 456         { 0x8081, 0xc4 },
 457         { 0x80a5, 0x40 },
 458         { 0x80aa, 0x77 },
 459         { 0x80ad, 0x77 },
 460         { 0x80a6, 0x67 },
 461         { 0x8262, 0x20 },
 462         { 0x821c, 0x30 },
 463         { 0x80b8, 0x3e },
 464         { 0x80b9, 0xf0 },
 465         { 0x80ba, 0x01 },
 466         { 0x80bb, 0x18 },
 467         { 0x80bc, 0x50 },
 468         { 0x80bd, 0x00 },
 469         { 0x80be, 0xea },
 470         { 0x80bf, 0xef },
 471         { 0x80c0, 0xfc },
 472         { 0x80c1, 0xbd },
 473         { 0x80c2, 0x1f },
 474         { 0x80c3, 0xfc },
 475         { 0x80c4, 0xdd },
 476         { 0x80c5, 0xaf },
 477         { 0x80c6, 0x00 },
 478         { 0x80c7, 0x38 },
 479         { 0x80c8, 0x30 },
 480         { 0x80c9, 0x05 },
 481         { 0x80ca, 0x4a },
 482         { 0x80cb, 0xd0 },
 483         { 0x80cc, 0x01 },
 484         { 0x80cd, 0xd9 },
 485         { 0x80ce, 0x6f },
 486         { 0x80cf, 0xf9 },
 487         { 0x80d0, 0x70 },
 488         { 0x80d1, 0xdf },
 489         { 0x80d2, 0xf7 },
 490         { 0x80d3, 0xc2 },
 491         { 0x80d4, 0xdf },
 492         { 0x80d5, 0x02 },
 493         { 0x80d6, 0x9a },
 494         { 0x80d7, 0xd0 },
 495         { 0x8250, 0x0d },
 496         { 0x8251, 0xcd },
 497         { 0x8252, 0xe0 },
 498         { 0x8253, 0x05 },
 499         { 0x8254, 0xa7 },
 500         { 0x8255, 0xff },
 501         { 0x8256, 0xed },
 502         { 0x8257, 0x5b },
 503         { 0x8258, 0xae },
 504         { 0x8259, 0xe6 },
 505         { 0x825a, 0x3d },
 506         { 0x825b, 0x0f },
 507         { 0x825c, 0x0d },
 508         { 0x825d, 0xea },
 509         { 0x825e, 0xf2 },
 510         { 0x825f, 0x51 },
 511         { 0x8260, 0xf5 },
 512         { 0x8261, 0x06 },
 513         { 0x821a, 0x00 },
 514         { 0x8546, 0x40 },
 515         { 0x8210, 0x26 },
 516         { 0x8211, 0xf6 },
 517         { 0x8212, 0x84 },
 518         { 0x8213, 0x02 },
 519         { 0x8502, 0x01 },
 520         { 0x8121, 0x04 },
 521         { 0x8122, 0x04 },
 522         { 0x852e, 0x10 },
 523         { 0x80a4, 0xca },
 524         { 0x80a7, 0x40 },
 525         { 0x8526, 0x01 },
 526 };
 527
 528 static int au8522_enable_modulation(struct dvb_frontend *fe,
 529                                     fe_modulation_t m)
 530 {
 531         struct au8522_state *state = fe->demodulator_priv;
 532         int i;
 533
 534         dprintk("%s(0x%08x)\n", __func__, m);
 535
 536         switch (m) {
 537         case VSB_8:
 538                 dprintk("%s() VSB_8\n", __func__);
 539                 for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
 540                         au8522_writereg(state,
 541                                 VSB_mod_tab[i].reg,
 542                                 VSB_mod_tab[i].data);
 543                 au8522_set_if(fe, state->config->vsb_if);
 544                 break;
 545         case QAM_64:
 546                 dprintk("%s() QAM 64\n", __func__);
 547                 for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
 548                         au8522_writereg(state,
 549                                 QAM64_mod_tab[i].reg,
 550                                 QAM64_mod_tab[i].data);
 551                 au8522_set_if(fe, state->config->qam_if);
 552                 break;
 553         case QAM_256:
 554                 dprintk("%s() QAM 256\n", __func__);
 555                 for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
 556                         au8522_writereg(state,
 557                                 QAM256_mod_tab[i].reg,
 558                                 QAM256_mod_tab[i].data);
 559                 au8522_set_if(fe, state->config->qam_if);
 560                 break;
 561         default:
 562                 dprintk("%s() Invalid modulation\n", __func__);
 563                 return -EINVAL;
 564         }
 565
 566         state->current_modulation = m;
 567
 568         return 0;
 569 }
 570
 571 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 572 static int au8522_set_frontend(struct dvb_frontend *fe,
 573                                struct dvb_frontend_parameters *p)
 574 {
 575         struct au8522_state *state = fe->demodulator_priv;
 576         int ret = -EINVAL;
 577
 578         dprintk("%s(frequency=%d)\n", __func__, p->frequency);
 579
 580         if ((state->current_frequency == p->frequency) &&
 581             (state->current_modulation == p->u.vsb.modulation))
 582                 return 0;
 583
 584         au8522_enable_modulation(fe, p->u.vsb.modulation);
 585
 586         /* Allow the demod to settle */
 587         msleep(100);
 588
 589         if (fe->ops.tuner_ops.set_params) {
 590                 if (fe->ops.i2c_gate_ctrl)
 591                         fe->ops.i2c_gate_ctrl(fe, 1);
 592                 ret = fe->ops.tuner_ops.set_params(fe, p);
 593                 if (fe->ops.i2c_gate_ctrl)
 594                         fe->ops.i2c_gate_ctrl(fe, 0);
 595         }
 596
 597         if (ret < 0)
 598                 return ret;
 599
 600         state->current_frequency = p->frequency;
 601
 602         return 0;
 603 }
 604
 605 /* Reset the demod hardware and reset all of the configuration registers
 606    to a default state. */
 607 int au8522_init(struct dvb_frontend *fe)
 608 {
 609         struct au8522_state *state = fe->demodulator_priv;
 610         dprintk("%s()\n", __func__);
 611
 612         au8522_writereg(state, 0xa4, 1 << 5);
 613
 614         au8522_i2c_gate_ctrl(fe, 1);
 615
 616         return 0;
 617 }
 618
 619 static int au8522_led_gpio_enable(struct au8522_state *state, int onoff)
 620 {
 621         struct au8522_led_config *led_config = state->config->led_cfg;
 622         u8 val;
 623
 624         /* bail out if we cant control an LED */
 625         if (!led_config || !led_config->gpio_output ||
 626             !led_config->gpio_output_enable || !led_config->gpio_output_disable)
 627                 return 0;
 628
 629         val = au8522_readreg(state, 0x4000 |
 630                              (led_config->gpio_output & ~0xc000));
 631         if (onoff) {
 632                 /* enable GPIO output */
 633                 val &= ~((led_config->gpio_output_enable >> 8) & 0xff);
 634                 val |=  (led_config->gpio_output_enable & 0xff);
 635         } else {
 636                 /* disable GPIO output */
 637                 val &= ~((led_config->gpio_output_disable >> 8) & 0xff);
 638                 val |=  (led_config->gpio_output_disable & 0xff);
 639         }
 640         return au8522_writereg(state, 0x8000 |
 641                                (led_config->gpio_output & ~0xc000), val);
 642 }
 643
 644 /* led = 0 | off
 645  * led = 1 | signal ok
 646  * led = 2 | signal strong
 647  * led < 0 | only light led if leds are currently off
 648  */
 649 static int au8522_led_ctrl(struct au8522_state *state, int led)
 650 {
 651         struct au8522_led_config *led_config = state->config->led_cfg;
 652         int i, ret = 0;
 653
 654         /* bail out if we cant control an LED */
 655         if (!led_config || !led_config->gpio_leds ||
 656             !led_config->num_led_states || !led_config->led_states)
 657                 return 0;
 658
 659         if (led < 0) {
 660                 /* if LED is already lit, then leave it as-is */
 661                 if (state->led_state)
 662                         return 0;
 663                 else
 664                         led *= -1;
 665         }
 666
 667         /* toggle LED if changing state */
 668         if (state->led_state != led) {
 669                 u8 val;
 670
 671                 dprintk("%s: %d\n", __func__, led);
 672
 673                 au8522_led_gpio_enable(state, 1);
 674
 675                 val = au8522_readreg(state, 0x4000 |
 676                                      (led_config->gpio_leds & ~0xc000));
 677
 678                 /* start with all leds off */
 679                 for (i = 0; i < led_config->num_led_states; i++)
 680                         val &= ~led_config->led_states[i];
 681
 682                 /* set selected LED state */
 683                 if (led < led_config->num_led_states)
 684                         val |= led_config->led_states[led];
 685                 else if (led_config->num_led_states)
 686                         val |=
 687                         led_config->led_states[led_config->num_led_states - 1];
 688
 689                 ret = au8522_writereg(state, 0x8000 |
 690                                       (led_config->gpio_leds & ~0xc000), val);
 691                 if (ret < 0)
 692                         return ret;
 693
 694                 state->led_state = led;
 695
 696                 if (led == 0)
 697                         au8522_led_gpio_enable(state, 0);
 698         }
 699
 700         return 0;
 701 }
 702
 703 int au8522_sleep(struct dvb_frontend *fe)
 704 {
 705         struct au8522_state *state = fe->demodulator_priv;
 706         dprintk("%s()\n", __func__);
 707
 708         /* turn off led */
 709         au8522_led_ctrl(state, 0);
 710
 711         /* Power down the chip */
 712         au8522_writereg(state, 0xa4, 1 << 5);
 713
 714         state->current_frequency = 0;
 715
 716         return 0;
 717 }
 718
 719 static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
 720 {
 721         struct au8522_state *state = fe->demodulator_priv;
 722         u8 reg;
 723         u32 tuner_status = 0;
 724
 725         *status = 0;
 726
 727         if (state->current_modulation == VSB_8) {
 728                 dprintk("%s() Checking VSB_8\n", __func__);
 729                 reg = au8522_readreg(state, 0x4088);
 730                 if ((reg & 0x03) == 0x03)
 731                         *status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
 732         } else {
 733                 dprintk("%s() Checking QAM\n", __func__);
 734                 reg = au8522_readreg(state, 0x4541);
 735                 if (reg & 0x80)
 736                         *status |= FE_HAS_VITERBI;
 737                 if (reg & 0x20)
 738                         *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 739         }
 740
 741         switch (state->config->status_mode) {
 742         case AU8522_DEMODLOCKING:
 743                 dprintk("%s() DEMODLOCKING\n", __func__);
 744                 if (*status & FE_HAS_VITERBI)
 745                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 746                 break;
 747         case AU8522_TUNERLOCKING:
 748                 /* Get the tuner status */
 749                 dprintk("%s() TUNERLOCKING\n", __func__);
 750                 if (fe->ops.tuner_ops.get_status) {
 751                         if (fe->ops.i2c_gate_ctrl)
 752                                 fe->ops.i2c_gate_ctrl(fe, 1);
 753
 754                         fe->ops.tuner_ops.get_status(fe, &tuner_status);
 755
 756                         if (fe->ops.i2c_gate_ctrl)
 757                                 fe->ops.i2c_gate_ctrl(fe, 0);
 758                 }
 759                 if (tuner_status)
 760                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 761                 break;
 762         }
 763         state->fe_status = *status;
 764
 765         if (*status & FE_HAS_LOCK)
 766                 /* turn on LED, if it isn't on already */
 767                 au8522_led_ctrl(state, -1);
 768         else
 769                 /* turn off LED */
 770                 au8522_led_ctrl(state, 0);
 771
 772         dprintk("%s() status 0x%08x\n", __func__, *status);
 773
 774         return 0;
 775 }
 776
 777 static int au8522_led_status(struct au8522_state *state, const u16 *snr)
 778 {
 779         struct au8522_led_config *led_config = state->config->led_cfg;
 780         int led;
 781         u16 strong;
 782
 783         /* bail out if we cant control an LED */
 784         if (!led_config)
 785                 return 0;
 786
 787         if (0 == (state->fe_status & FE_HAS_LOCK))
 788                 return au8522_led_ctrl(state, 0);
 789         else if (state->current_modulation == QAM_256)
 790                 strong = led_config->qam256_strong;
 791         else if (state->current_modulation == QAM_64)
 792                 strong = led_config->qam64_strong;
 793         else /* (state->current_modulation == VSB_8) */
 794                 strong = led_config->vsb8_strong;
 795
 796         if (*snr >= strong)
 797                 led = 2;
 798         else
 799                 led = 1;
 800
 801         if ((state->led_state) &&
 802             (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
 803                 /* snr didn't change enough to bother
 804                  * changing the color of the led */
 805                 return 0;
 806
 807         return au8522_led_ctrl(state, led);
 808 }
 809
 810 static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
 811 {
 812         struct au8522_state *state = fe->demodulator_priv;
 813         int ret = -EINVAL;
 814
 815         dprintk("%s()\n", __func__);
 816
 817         if (state->current_modulation == QAM_256)
 818                 ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
 819                                             ARRAY_SIZE(qam256_mse2snr_tab),
 820                                             au8522_readreg(state, 0x4522),
 821                                             snr);
 822         else if (state->current_modulation == QAM_64)
 823                 ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
 824                                             ARRAY_SIZE(qam64_mse2snr_tab),
 825                                             au8522_readreg(state, 0x4522),
 826                                             snr);
 827         else /* VSB_8 */
 828                 ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
 829                                             ARRAY_SIZE(vsb_mse2snr_tab),
 830                                             au8522_readreg(state, 0x4311),
 831                                             snr);
 832
 833         if (state->config->led_cfg)
 834                 au8522_led_status(state, snr);
 835
 836         return ret;
 837 }
 838
 839 static int au8522_read_signal_strength(struct dvb_frontend *fe,
 840                                        u16 *signal_strength)
 841 {
 842         return au8522_read_snr(fe, signal_strength);
 843 }
 844
 845 static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 846 {
 847         struct au8522_state *state = fe->demodulator_priv;
 848
 849         if (state->current_modulation == VSB_8)
 850                 *ucblocks = au8522_readreg(state, 0x4087);
 851         else
 852                 *ucblocks = au8522_readreg(state, 0x4543);
 853
 854         return 0;
 855 }
 856
 857 static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
 858 {
 859         return au8522_read_ucblocks(fe, ber);
 860 }
 861
 862 static int au8522_get_frontend(struct dvb_frontend *fe,
 863                                 struct dvb_frontend_parameters *p)
 864 {
 865         struct au8522_state *state = fe->demodulator_priv;
 866
 867         p->frequency = state->current_frequency;
 868         p->u.vsb.modulation = state->current_modulation;
 869
 870         return 0;
 871 }
 872
 873 static int au8522_get_tune_settings(struct dvb_frontend *fe,
 874                                     struct dvb_frontend_tune_settings *tune)
 875 {
 876         tune->min_delay_ms = 1000;
 877         return 0;
 878 }
 879
 880 static struct dvb_frontend_ops au8522_ops;
 881
 882 int au8522_get_state(struct au8522_state **state, struct i2c_adapter *i2c,
 883                      u8 client_address)
 884 {
 885         int ret;
 886
 887         mutex_lock(&au8522_list_mutex);
 888         ret = hybrid_tuner_request_state(struct au8522_state, (*state),
 889                                          hybrid_tuner_instance_list,
 890                                          i2c, client_address, "au8522");
 891         mutex_unlock(&au8522_list_mutex);
 892
 893         return ret;
 894 }
 895
 896 void au8522_release_state(struct au8522_state *state)
 897 {
 898         mutex_lock(&au8522_list_mutex);
 899         if (state != NULL)
 900                 hybrid_tuner_release_state(state);
 901         mutex_unlock(&au8522_list_mutex);
 902 }
 903
 904
 905 static void au8522_release(struct dvb_frontend *fe)
 906 {
 907         struct au8522_state *state = fe->demodulator_priv;
 908         au8522_release_state(state);
 909 }
 910
 911 struct dvb_frontend *au8522_attach(const struct au8522_config *config,
 912                                    struct i2c_adapter *i2c)
 913 {
 914         struct au8522_state *state = NULL;
 915         int instance;
 916
 917         /* allocate memory for the internal state */
 918         instance = au8522_get_state(&state, i2c, config->demod_address);
 919         switch (instance) {
 920         case 0:
 921                 dprintk("%s state allocation failed\n", __func__);
 922                 break;
 923         case 1:
 924                 /* new demod instance */
 925                 dprintk("%s using new instance\n", __func__);
 926                 break;
 927         default:
 928                 /* existing demod instance */
 929                 dprintk("%s using existing instance\n", __func__);
 930                 break;
 931         }
 932
 933         /* setup the state */
 934         state->config = config;
 935         state->i2c = i2c;
 936         /* create dvb_frontend */
 937         memcpy(&state->frontend.ops, &au8522_ops,
 938                sizeof(struct dvb_frontend_ops));
 939         state->frontend.demodulator_priv = state;
 940
 941         if (au8522_init(&state->frontend) != 0) {
 942                 printk(KERN_ERR "%s: Failed to initialize correctly\n",
 943                         __func__);
 944                 goto error;
 945         }
 946
 947         /* Note: Leaving the I2C gate open here. */
 948         au8522_i2c_gate_ctrl(&state->frontend, 1);
 949
 950         return &state->frontend;
 951
 952 error:
 953         au8522_release_state(state);
 954         return NULL;
 955 }
 956 EXPORT_SYMBOL(au8522_attach);
 957
 958 static struct dvb_frontend_ops au8522_ops = {
 959
 960         .info = {
 961                 .name                   = "Auvitek AU8522 QAM/8VSB Frontend",
 962                 .type                   = FE_ATSC,
 963                 .frequency_min          = 54000000,
 964                 .frequency_max          = 858000000,
 965                 .frequency_stepsize     = 62500,
 966                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 967         },
 968
 969         .init                 = au8522_init,
 970         .sleep                = au8522_sleep,
 971         .i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 972         .set_frontend         = au8522_set_frontend,
 973         .get_frontend         = au8522_get_frontend,
 974         .get_tune_settings    = au8522_get_tune_settings,
 975         .read_status          = au8522_read_status,
 976         .read_ber             = au8522_read_ber,
 977         .read_signal_strength = au8522_read_signal_strength,
 978         .read_snr             = au8522_read_snr,
 979         .read_ucblocks        = au8522_read_ucblocks,
 980         .release              = au8522_release,
 981 };
 982
 983 module_param(debug, int, 0644);
 984 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 985
 986 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
 987 MODULE_AUTHOR("Steven Toth");
 988 MODULE_LICENSE("GPL");