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