linux/drivers/media/dvb-frontends/stb6100.c
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   1/*
   2        STB6100 Silicon Tuner
   3        Copyright (C) Manu Abraham (abraham.manu@gmail.com)
   4
   5        Copyright (C) ST Microelectronics
   6
   7        This program is free software; you can redistribute it and/or modify
   8        it under the terms of the GNU General Public License as published by
   9        the Free Software Foundation; either version 2 of the License, or
  10        (at your option) any later version.
  11
  12        This program is distributed in the hope that it will be useful,
  13        but WITHOUT ANY WARRANTY; without even the implied warranty of
  14        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15        GNU General Public License for more details.
  16
  17        You should have received a copy of the GNU General Public License
  18        along with this program; if not, write to the Free Software
  19        Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20*/
  21
  22#include <linux/init.h>
  23#include <linux/kernel.h>
  24#include <linux/module.h>
  25#include <linux/slab.h>
  26#include <linux/string.h>
  27
  28#include "dvb_frontend.h"
  29#include "stb6100.h"
  30
  31static unsigned int verbose;
  32module_param(verbose, int, 0644);
  33
  34/* Max transfer size done by I2C transfer functions */
  35#define MAX_XFER_SIZE  64
  36
  37#define FE_ERROR                0
  38#define FE_NOTICE               1
  39#define FE_INFO                 2
  40#define FE_DEBUG                3
  41
  42#define dprintk(x, y, z, format, arg...) do {                                           \
  43        if (z) {                                                                        \
  44                if      ((x > FE_ERROR) && (x > y))                                     \
  45                        printk(KERN_ERR "%s: " format "\n", __func__ , ##arg);          \
  46                else if ((x > FE_NOTICE) && (x > y))                                    \
  47                        printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg);       \
  48                else if ((x > FE_INFO) && (x > y))                                      \
  49                        printk(KERN_INFO "%s: " format "\n", __func__ , ##arg);         \
  50                else if ((x > FE_DEBUG) && (x > y))                                     \
  51                        printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg);        \
  52        } else {                                                                        \
  53                if (x > y)                                                              \
  54                        printk(format, ##arg);                                          \
  55        }                                                                               \
  56} while (0)
  57
  58struct stb6100_lkup {
  59        u32 val_low;
  60        u32 val_high;
  61        u8   reg;
  62};
  63
  64static void stb6100_release(struct dvb_frontend *fe);
  65
  66static const struct stb6100_lkup lkup[] = {
  67        {       0,  950000, 0x0a },
  68        {  950000, 1000000, 0x0a },
  69        { 1000000, 1075000, 0x0c },
  70        { 1075000, 1200000, 0x00 },
  71        { 1200000, 1300000, 0x01 },
  72        { 1300000, 1370000, 0x02 },
  73        { 1370000, 1470000, 0x04 },
  74        { 1470000, 1530000, 0x05 },
  75        { 1530000, 1650000, 0x06 },
  76        { 1650000, 1800000, 0x08 },
  77        { 1800000, 1950000, 0x0a },
  78        { 1950000, 2150000, 0x0c },
  79        { 2150000, 9999999, 0x0c },
  80        {       0,       0, 0x00 }
  81};
  82
  83/* Register names for easy debugging.   */
  84static const char *stb6100_regnames[] = {
  85        [STB6100_LD]            = "LD",
  86        [STB6100_VCO]           = "VCO",
  87        [STB6100_NI]            = "NI",
  88        [STB6100_NF_LSB]        = "NF",
  89        [STB6100_K]             = "K",
  90        [STB6100_G]             = "G",
  91        [STB6100_F]             = "F",
  92        [STB6100_DLB]           = "DLB",
  93        [STB6100_TEST1]         = "TEST1",
  94        [STB6100_FCCK]          = "FCCK",
  95        [STB6100_LPEN]          = "LPEN",
  96        [STB6100_TEST3]         = "TEST3",
  97};
  98
  99/* Template for normalisation, i.e. setting unused or undocumented
 100 * bits as required according to the documentation.
 101 */
 102struct stb6100_regmask {
 103        u8 mask;
 104        u8 set;
 105};
 106
 107static const struct stb6100_regmask stb6100_template[] = {
 108        [STB6100_LD]            = { 0xff, 0x00 },
 109        [STB6100_VCO]           = { 0xff, 0x00 },
 110        [STB6100_NI]            = { 0xff, 0x00 },
 111        [STB6100_NF_LSB]        = { 0xff, 0x00 },
 112        [STB6100_K]             = { 0xc7, 0x38 },
 113        [STB6100_G]             = { 0xef, 0x10 },
 114        [STB6100_F]             = { 0x1f, 0xc0 },
 115        [STB6100_DLB]           = { 0x38, 0xc4 },
 116        [STB6100_TEST1]         = { 0x00, 0x8f },
 117        [STB6100_FCCK]          = { 0x40, 0x0d },
 118        [STB6100_LPEN]          = { 0xf0, 0x0b },
 119        [STB6100_TEST3]         = { 0x00, 0xde },
 120};
 121
 122/*
 123 * Currently unused. Some boards might need it in the future
 124 */
 125static inline void stb6100_normalise_regs(u8 regs[])
 126{
 127        int i;
 128
 129        for (i = 0; i < STB6100_NUMREGS; i++)
 130                regs[i] = (regs[i] & stb6100_template[i].mask) | stb6100_template[i].set;
 131}
 132
 133static int stb6100_read_regs(struct stb6100_state *state, u8 regs[])
 134{
 135        int rc;
 136        struct i2c_msg msg = {
 137                .addr   = state->config->tuner_address,
 138                .flags  = I2C_M_RD,
 139                .buf    = regs,
 140                .len    = STB6100_NUMREGS
 141        };
 142
 143        rc = i2c_transfer(state->i2c, &msg, 1);
 144        if (unlikely(rc != 1)) {
 145                dprintk(verbose, FE_ERROR, 1, "Read (0x%x) err, rc=[%d]",
 146                        state->config->tuner_address, rc);
 147
 148                return -EREMOTEIO;
 149        }
 150        if (unlikely(verbose > FE_DEBUG)) {
 151                int i;
 152
 153                dprintk(verbose, FE_DEBUG, 1, "    Read from 0x%02x", state->config->tuner_address);
 154                for (i = 0; i < STB6100_NUMREGS; i++)
 155                        dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[i], regs[i]);
 156        }
 157        return 0;
 158}
 159
 160static int stb6100_read_reg(struct stb6100_state *state, u8 reg)
 161{
 162        u8 regs[STB6100_NUMREGS];
 163
 164        struct i2c_msg msg = {
 165                .addr   = state->config->tuner_address + reg,
 166                .flags  = I2C_M_RD,
 167                .buf    = regs,
 168                .len    = 1
 169        };
 170
 171        i2c_transfer(state->i2c, &msg, 1);
 172
 173        if (unlikely(reg >= STB6100_NUMREGS)) {
 174                dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 175                return -EINVAL;
 176        }
 177        if (unlikely(verbose > FE_DEBUG)) {
 178                dprintk(verbose, FE_DEBUG, 1, "    Read from 0x%02x", state->config->tuner_address);
 179                dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[reg], regs[0]);
 180        }
 181
 182        return (unsigned int)regs[0];
 183}
 184
 185static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int start, int len)
 186{
 187        int rc;
 188        u8 cmdbuf[MAX_XFER_SIZE];
 189        struct i2c_msg msg = {
 190                .addr   = state->config->tuner_address,
 191                .flags  = 0,
 192                .buf    = cmdbuf,
 193                .len    = len + 1
 194        };
 195
 196        if (1 + len > sizeof(cmdbuf)) {
 197                printk(KERN_WARNING
 198                       "%s: i2c wr: len=%d is too big!\n",
 199                       KBUILD_MODNAME, len);
 200                return -EINVAL;
 201        }
 202
 203        if (unlikely(start < 1 || start + len > STB6100_NUMREGS)) {
 204                dprintk(verbose, FE_ERROR, 1, "Invalid register range %d:%d",
 205                        start, len);
 206                return -EINVAL;
 207        }
 208        memcpy(&cmdbuf[1], buf, len);
 209        cmdbuf[0] = start;
 210
 211        if (unlikely(verbose > FE_DEBUG)) {
 212                int i;
 213
 214                dprintk(verbose, FE_DEBUG, 1, "    Write @ 0x%02x: [%d:%d]", state->config->tuner_address, start, len);
 215                for (i = 0; i < len; i++)
 216                        dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[start + i], buf[i]);
 217        }
 218        rc = i2c_transfer(state->i2c, &msg, 1);
 219        if (unlikely(rc != 1)) {
 220                dprintk(verbose, FE_ERROR, 1, "(0x%x) write err [%d:%d], rc=[%d]",
 221                        (unsigned int)state->config->tuner_address, start, len, rc);
 222                return -EREMOTEIO;
 223        }
 224        return 0;
 225}
 226
 227static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
 228{
 229        if (unlikely(reg >= STB6100_NUMREGS)) {
 230                dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 231                return -EREMOTEIO;
 232        }
 233        data = (data & stb6100_template[reg].mask) | stb6100_template[reg].set;
 234        return stb6100_write_reg_range(state, &data, reg, 1);
 235}
 236
 237
 238static int stb6100_get_status(struct dvb_frontend *fe, u32 *status)
 239{
 240        int rc;
 241        struct stb6100_state *state = fe->tuner_priv;
 242
 243        rc = stb6100_read_reg(state, STB6100_LD);
 244        if (rc < 0) {
 245                dprintk(verbose, FE_ERROR, 1, "%s failed", __func__);
 246                return rc;
 247        }
 248        return (rc & STB6100_LD_LOCK) ? TUNER_STATUS_LOCKED : 0;
 249}
 250
 251static int stb6100_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 252{
 253        int rc;
 254        u8 f;
 255        u32 bw;
 256        struct stb6100_state *state = fe->tuner_priv;
 257
 258        rc = stb6100_read_reg(state, STB6100_F);
 259        if (rc < 0)
 260                return rc;
 261        f = rc & STB6100_F_F;
 262
 263        bw = (f + 5) * 2000;    /* x2 for ZIF   */
 264
 265        *bandwidth = state->bandwidth = bw * 1000;
 266        dprintk(verbose, FE_DEBUG, 1, "bandwidth = %u Hz", state->bandwidth);
 267        return 0;
 268}
 269
 270static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 271{
 272        u32 tmp;
 273        int rc;
 274        struct stb6100_state *state = fe->tuner_priv;
 275
 276        dprintk(verbose, FE_DEBUG, 1, "set bandwidth to %u Hz", bandwidth);
 277
 278        bandwidth /= 2; /* ZIF */
 279
 280        if (bandwidth >= 36000000)      /* F[4:0] BW/2 max =31+5=36 mhz for F=31        */
 281                tmp = 31;
 282        else if (bandwidth <= 5000000)  /* bw/2 min = 5Mhz for F=0                      */
 283                tmp = 0;
 284        else                            /* if 5 < bw/2 < 36                             */
 285                tmp = (bandwidth + 500000) / 1000000 - 5;
 286
 287        /* Turn on LPF bandwidth setting clock control,
 288         * set bandwidth, wait 10ms, turn off.
 289         */
 290        rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d | STB6100_FCCK_FCCK);
 291        if (rc < 0)
 292                return rc;
 293        rc = stb6100_write_reg(state, STB6100_F, 0xc0 | tmp);
 294        if (rc < 0)
 295                return rc;
 296
 297        msleep(5);  /*  This is dangerous as another (related) thread may start */
 298
 299        rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 300        if (rc < 0)
 301                return rc;
 302
 303        msleep(10);  /*  This is dangerous as another (related) thread may start */
 304
 305        return 0;
 306}
 307
 308static int stb6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 309{
 310        int rc;
 311        u32 nint, nfrac, fvco;
 312        int psd2, odiv;
 313        struct stb6100_state *state = fe->tuner_priv;
 314        u8 regs[STB6100_NUMREGS];
 315
 316        rc = stb6100_read_regs(state, regs);
 317        if (rc < 0)
 318                return rc;
 319
 320        odiv = (regs[STB6100_VCO] & STB6100_VCO_ODIV) >> STB6100_VCO_ODIV_SHIFT;
 321        psd2 = (regs[STB6100_K] & STB6100_K_PSD2) >> STB6100_K_PSD2_SHIFT;
 322        nint = regs[STB6100_NI];
 323        nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) | regs[STB6100_NF_LSB];
 324        fvco = (nfrac * state->reference >> (9 - psd2)) + (nint * state->reference << psd2);
 325        *frequency = state->frequency = fvco >> (odiv + 1);
 326
 327        dprintk(verbose, FE_DEBUG, 1,
 328                "frequency = %u kHz, odiv = %u, psd2 = %u, fxtal = %u kHz, fvco = %u kHz, N(I) = %u, N(F) = %u",
 329                state->frequency, odiv, psd2, state->reference, fvco, nint, nfrac);
 330        return 0;
 331}
 332
 333
 334static int stb6100_set_frequency(struct dvb_frontend *fe, u32 frequency)
 335{
 336        int rc;
 337        const struct stb6100_lkup *ptr;
 338        struct stb6100_state *state = fe->tuner_priv;
 339        struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 340
 341        u32 srate = 0, fvco, nint, nfrac;
 342        u8 regs[STB6100_NUMREGS];
 343        u8 g, psd2, odiv;
 344
 345        dprintk(verbose, FE_DEBUG, 1, "Version 2010-8-14 13:51");
 346
 347        if (fe->ops.get_frontend) {
 348                dprintk(verbose, FE_DEBUG, 1, "Get frontend parameters");
 349                fe->ops.get_frontend(fe, p);
 350        }
 351        srate = p->symbol_rate;
 352
 353        /* Set up tuner cleanly, LPF calibration on */
 354        rc = stb6100_write_reg(state, STB6100_FCCK, 0x4d | STB6100_FCCK_FCCK);
 355        if (rc < 0)
 356                return rc;  /* allow LPF calibration */
 357
 358        /* PLL Loop disabled, bias on, VCO on, synth on */
 359        regs[STB6100_LPEN] = 0xeb;
 360        rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 361        if (rc < 0)
 362                return rc;
 363
 364        /* Program the registers with their data values */
 365
 366        /* VCO divide ratio (LO divide ratio, VCO prescaler enable).    */
 367        if (frequency <= 1075000)
 368                odiv = 1;
 369        else
 370                odiv = 0;
 371
 372        /* VCO enabled, search clock off as per LL3.7, 3.4.1 */
 373        regs[STB6100_VCO] = 0xe0 | (odiv << STB6100_VCO_ODIV_SHIFT);
 374
 375        /* OSM  */
 376        for (ptr = lkup;
 377             (ptr->val_high != 0) && !CHKRANGE(frequency, ptr->val_low, ptr->val_high);
 378             ptr++);
 379
 380        if (ptr->val_high == 0) {
 381                printk(KERN_ERR "%s: frequency out of range: %u kHz\n", __func__, frequency);
 382                return -EINVAL;
 383        }
 384        regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_OSM) | ptr->reg;
 385        rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 386        if (rc < 0)
 387                return rc;
 388
 389        if ((frequency > 1075000) && (frequency <= 1325000))
 390                psd2 = 0;
 391        else
 392                psd2 = 1;
 393        /* F(VCO) = F(LO) * (ODIV == 0 ? 2 : 4)                 */
 394        fvco = frequency << (1 + odiv);
 395        /* N(I) = floor(f(VCO) / (f(XTAL) * (PSD2 ? 2 : 1)))    */
 396        nint = fvco / (state->reference << psd2);
 397        /* N(F) = round(f(VCO) / f(XTAL) * (PSD2 ? 2 : 1) - N(I)) * 2 ^ 9       */
 398        nfrac = DIV_ROUND_CLOSEST((fvco - (nint * state->reference << psd2))
 399                                         << (9 - psd2), state->reference);
 400
 401        /* NI */
 402        regs[STB6100_NI] = nint;
 403        rc = stb6100_write_reg(state, STB6100_NI, regs[STB6100_NI]);
 404        if (rc < 0)
 405                return rc;
 406
 407        /* NF */
 408        regs[STB6100_NF_LSB] = nfrac;
 409        rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]);
 410        if (rc < 0)
 411                return rc;
 412
 413        /* K */
 414        regs[STB6100_K] = (0x38 & ~STB6100_K_PSD2) | (psd2 << STB6100_K_PSD2_SHIFT);
 415        regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) | ((nfrac >> 8) & STB6100_K_NF_MSB);
 416        rc = stb6100_write_reg(state, STB6100_K, regs[STB6100_K]);
 417        if (rc < 0)
 418                return rc;
 419
 420        /* G Baseband gain. */
 421        if (srate >= 15000000)
 422                g = 9;  /*  +4 dB */
 423        else if (srate >= 5000000)
 424                g = 11; /*  +8 dB */
 425        else
 426                g = 14; /* +14 dB */
 427
 428        regs[STB6100_G] = (0x10 & ~STB6100_G_G) | g;
 429        regs[STB6100_G] &= ~STB6100_G_GCT; /* mask GCT */
 430        regs[STB6100_G] |= (1 << 5); /* 2Vp-p Mode */
 431        rc = stb6100_write_reg(state, STB6100_G, regs[STB6100_G]);
 432        if (rc < 0)
 433                return rc;
 434
 435        /* F we don't write as it is set up in BW set */
 436
 437        /* DLB set DC servo loop BW to 160Hz (LLA 3.8 / 2.1) */
 438        regs[STB6100_DLB] = 0xcc;
 439        rc = stb6100_write_reg(state, STB6100_DLB, regs[STB6100_DLB]);
 440        if (rc < 0)
 441                return rc;
 442
 443        dprintk(verbose, FE_DEBUG, 1,
 444                "frequency = %u, srate = %u, g = %u, odiv = %u, psd2 = %u, fxtal = %u, osm = %u, fvco = %u, N(I) = %u, N(F) = %u",
 445                frequency, srate, (unsigned int)g, (unsigned int)odiv,
 446                (unsigned int)psd2, state->reference,
 447                ptr->reg, fvco, nint, nfrac);
 448
 449        /* Set up the test registers */
 450        regs[STB6100_TEST1] = 0x8f;
 451        rc = stb6100_write_reg(state, STB6100_TEST1, regs[STB6100_TEST1]);
 452        if (rc < 0)
 453                return rc;
 454        regs[STB6100_TEST3] = 0xde;
 455        rc = stb6100_write_reg(state, STB6100_TEST3, regs[STB6100_TEST3]);
 456        if (rc < 0)
 457                return rc;
 458
 459        /* Bring up tuner according to LLA 3.7 3.4.1, step 2 */
 460        regs[STB6100_LPEN] = 0xfb; /* PLL Loop enabled, bias on, VCO on, synth on */
 461        rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 462        if (rc < 0)
 463                return rc;
 464
 465        msleep(2);
 466
 467        /* Bring up tuner according to LLA 3.7 3.4.1, step 3 */
 468        regs[STB6100_VCO] &= ~STB6100_VCO_OCK;          /* VCO fast search              */
 469        rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 470        if (rc < 0)
 471                return rc;
 472
 473        msleep(10);  /*  This is dangerous as another (related) thread may start */ /* wait for LO to lock */
 474
 475        regs[STB6100_VCO] &= ~STB6100_VCO_OSCH;         /* vco search disabled          */
 476        regs[STB6100_VCO] |= STB6100_VCO_OCK;           /* search clock off             */
 477        rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 478        if (rc < 0)
 479                return rc;
 480
 481        rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 482        if (rc < 0)
 483                return rc;  /* Stop LPF calibration */
 484
 485        msleep(10);  /*  This is dangerous as another (related) thread may start */
 486                     /* wait for stabilisation, (should not be necessary)               */
 487        return 0;
 488}
 489
 490static int stb6100_sleep(struct dvb_frontend *fe)
 491{
 492        /* TODO: power down     */
 493        return 0;
 494}
 495
 496static int stb6100_init(struct dvb_frontend *fe)
 497{
 498        struct stb6100_state *state = fe->tuner_priv;
 499        int refclk = 27000000; /* Hz */
 500
 501        /*
 502         * iqsense = 1
 503         * tunerstep = 125000
 504         */
 505        state->bandwidth        = 36000000;             /* Hz   */
 506        state->reference        = refclk / 1000;        /* kHz  */
 507
 508        /* Set default bandwidth. Modified, PN 13-May-10        */
 509        return 0;
 510}
 511
 512static int stb6100_set_params(struct dvb_frontend *fe)
 513{
 514        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 515
 516        if (c->frequency > 0)
 517                stb6100_set_frequency(fe, c->frequency);
 518
 519        if (c->bandwidth_hz > 0)
 520                stb6100_set_bandwidth(fe, c->bandwidth_hz);
 521
 522        return 0;
 523}
 524
 525static const struct dvb_tuner_ops stb6100_ops = {
 526        .info = {
 527                .name                   = "STB6100 Silicon Tuner",
 528                .frequency_min          = 950000,
 529                .frequency_max          = 2150000,
 530                .frequency_step         = 0,
 531        },
 532
 533        .init           = stb6100_init,
 534        .sleep          = stb6100_sleep,
 535        .get_status     = stb6100_get_status,
 536        .set_params     = stb6100_set_params,
 537        .get_frequency  = stb6100_get_frequency,
 538        .get_bandwidth  = stb6100_get_bandwidth,
 539        .release        = stb6100_release
 540};
 541
 542struct dvb_frontend *stb6100_attach(struct dvb_frontend *fe,
 543                                    const struct stb6100_config *config,
 544                                    struct i2c_adapter *i2c)
 545{
 546        struct stb6100_state *state = NULL;
 547
 548        state = kzalloc(sizeof (struct stb6100_state), GFP_KERNEL);
 549        if (!state)
 550                return NULL;
 551
 552        state->config           = config;
 553        state->i2c              = i2c;
 554        state->frontend         = fe;
 555        state->reference        = config->refclock / 1000; /* kHz */
 556        fe->tuner_priv          = state;
 557        fe->ops.tuner_ops       = stb6100_ops;
 558
 559        printk("%s: Attaching STB6100 \n", __func__);
 560        return fe;
 561}
 562
 563static void stb6100_release(struct dvb_frontend *fe)
 564{
 565        struct stb6100_state *state = fe->tuner_priv;
 566
 567        fe->tuner_priv = NULL;
 568        kfree(state);
 569}
 570
 571EXPORT_SYMBOL(stb6100_attach);
 572MODULE_PARM_DESC(verbose, "Set Verbosity level");
 573
 574MODULE_AUTHOR("Manu Abraham");
 575MODULE_DESCRIPTION("STB6100 Silicon tuner");
 576MODULE_LICENSE("GPL");
 577