drivers/media/dvb-frontends/stb6100.c

   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
  31 static unsigned int verbose;
  32 module_param(verbose, int, 0644);
  33
  34
  35 #define FE_ERROR                0
  36 #define FE_NOTICE               1
  37 #define FE_INFO                 2
  38 #define FE_DEBUG                3
  39
  40 #define dprintk(x, y, z, format, arg...) do {                                           \
  41         if (z) {                                                                        \
  42                 if      ((x > FE_ERROR) && (x > y))                                     \
  43                         printk(KERN_ERR "%s: " format "\n", __func__ , ##arg);          \
  44                 else if ((x > FE_NOTICE) && (x > y))                                    \
  45                         printk(KERN_NOTICE "%s: " format "\n", __func__ , ##arg);       \
  46                 else if ((x > FE_INFO) && (x > y))                                      \
  47                         printk(KERN_INFO "%s: " format "\n", __func__ , ##arg);         \
  48                 else if ((x > FE_DEBUG) && (x > y))                                     \
  49                         printk(KERN_DEBUG "%s: " format "\n", __func__ , ##arg);        \
  50         } else {                                                                        \
  51                 if (x > y)                                                              \
  52                         printk(format, ##arg);                                          \
  53         }                                                                               \
  54 } while (0)
  55
  56 struct stb6100_lkup {
  57         u32 val_low;
  58         u32 val_high;
  59         u8   reg;
  60 };
  61
  62 static int stb6100_release(struct dvb_frontend *fe);
  63
  64 static const struct stb6100_lkup lkup[] = {
  65         {       0,  950000, 0x0a },
  66         {  950000, 1000000, 0x0a },
  67         { 1000000, 1075000, 0x0c },
  68         { 1075000, 1200000, 0x00 },
  69         { 1200000, 1300000, 0x01 },
  70         { 1300000, 1370000, 0x02 },
  71         { 1370000, 1470000, 0x04 },
  72         { 1470000, 1530000, 0x05 },
  73         { 1530000, 1650000, 0x06 },
  74         { 1650000, 1800000, 0x08 },
  75         { 1800000, 1950000, 0x0a },
  76         { 1950000, 2150000, 0x0c },
  77         { 2150000, 9999999, 0x0c },
  78         {       0,       0, 0x00 }
  79 };
  80
  81 /* Register names for easy debugging.   */
  82 static const char *stb6100_regnames[] = {
  83         [STB6100_LD]            = "LD",
  84         [STB6100_VCO]           = "VCO",
  85         [STB6100_NI]            = "NI",
  86         [STB6100_NF_LSB]        = "NF",
  87         [STB6100_K]             = "K",
  88         [STB6100_G]             = "G",
  89         [STB6100_F]             = "F",
  90         [STB6100_DLB]           = "DLB",
  91         [STB6100_TEST1]         = "TEST1",
  92         [STB6100_FCCK]          = "FCCK",
  93         [STB6100_LPEN]          = "LPEN",
  94         [STB6100_TEST3]         = "TEST3",
  95 };
  96
  97 /* Template for normalisation, i.e. setting unused or undocumented
  98  * bits as required according to the documentation.
  99  */
 100 struct stb6100_regmask {
 101         u8 mask;
 102         u8 set;
 103 };
 104
 105 static const struct stb6100_regmask stb6100_template[] = {
 106         [STB6100_LD]            = { 0xff, 0x00 },
 107         [STB6100_VCO]           = { 0xff, 0x00 },
 108         [STB6100_NI]            = { 0xff, 0x00 },
 109         [STB6100_NF_LSB]        = { 0xff, 0x00 },
 110         [STB6100_K]             = { 0xc7, 0x38 },
 111         [STB6100_G]             = { 0xef, 0x10 },
 112         [STB6100_F]             = { 0x1f, 0xc0 },
 113         [STB6100_DLB]           = { 0x38, 0xc4 },
 114         [STB6100_TEST1]         = { 0x00, 0x8f },
 115         [STB6100_FCCK]          = { 0x40, 0x0d },
 116         [STB6100_LPEN]          = { 0xf0, 0x0b },
 117         [STB6100_TEST3]         = { 0x00, 0xde },
 118 };
 119
 120 /*
 121  * Currently unused. Some boards might need it in the future
 122  */
 123 static inline void stb6100_normalise_regs(u8 regs[])
 124 {
 125         int i;
 126
 127         for (i = 0; i < STB6100_NUMREGS; i++)
 128                 regs[i] = (regs[i] & stb6100_template[i].mask) | stb6100_template[i].set;
 129 }
 130
 131 static int stb6100_read_regs(struct stb6100_state *state, u8 regs[])
 132 {
 133         int rc;
 134         struct i2c_msg msg = {
 135                 .addr   = state->config->tuner_address,
 136                 .flags  = I2C_M_RD,
 137                 .buf    = regs,
 138                 .len    = STB6100_NUMREGS
 139         };
 140
 141         rc = i2c_transfer(state->i2c, &msg, 1);
 142         if (unlikely(rc != 1)) {
 143                 dprintk(verbose, FE_ERROR, 1, "Read (0x%x) err, rc=[%d]",
 144                         state->config->tuner_address, rc);
 145
 146                 return -EREMOTEIO;
 147         }
 148         if (unlikely(verbose > FE_DEBUG)) {
 149                 int i;
 150
 151                 dprintk(verbose, FE_DEBUG, 1, "    Read from 0x%02x", state->config->tuner_address);
 152                 for (i = 0; i < STB6100_NUMREGS; i++)
 153                         dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[i], regs[i]);
 154         }
 155         return 0;
 156 }
 157
 158 static int stb6100_read_reg(struct stb6100_state *state, u8 reg)
 159 {
 160         u8 regs[STB6100_NUMREGS];
 161
 162         struct i2c_msg msg = {
 163                 .addr   = state->config->tuner_address + reg,
 164                 .flags  = I2C_M_RD,
 165                 .buf    = regs,
 166                 .len    = 1
 167         };
 168
 169         i2c_transfer(state->i2c, &msg, 1);
 170
 171         if (unlikely(reg >= STB6100_NUMREGS)) {
 172                 dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 173                 return -EINVAL;
 174         }
 175         if (unlikely(verbose > FE_DEBUG)) {
 176                 dprintk(verbose, FE_DEBUG, 1, "    Read from 0x%02x", state->config->tuner_address);
 177                 dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[reg], regs[0]);
 178         }
 179
 180         return (unsigned int)regs[0];
 181 }
 182
 183 static int stb6100_write_reg_range(struct stb6100_state *state, u8 buf[], int start, int len)
 184 {
 185         int rc;
 186         u8 cmdbuf[len + 1];
 187         struct i2c_msg msg = {
 188                 .addr   = state->config->tuner_address,
 189                 .flags  = 0,
 190                 .buf    = cmdbuf,
 191                 .len    = len + 1
 192         };
 193
 194         if (unlikely(start < 1 || start + len > STB6100_NUMREGS)) {
 195                 dprintk(verbose, FE_ERROR, 1, "Invalid register range %d:%d",
 196                         start, len);
 197                 return -EINVAL;
 198         }
 199         memcpy(&cmdbuf[1], buf, len);
 200         cmdbuf[0] = start;
 201
 202         if (unlikely(verbose > FE_DEBUG)) {
 203                 int i;
 204
 205                 dprintk(verbose, FE_DEBUG, 1, "    Write @ 0x%02x: [%d:%d]", state->config->tuner_address, start, len);
 206                 for (i = 0; i < len; i++)
 207                         dprintk(verbose, FE_DEBUG, 1, "        %s: 0x%02x", stb6100_regnames[start + i], buf[i]);
 208         }
 209         rc = i2c_transfer(state->i2c, &msg, 1);
 210         if (unlikely(rc != 1)) {
 211                 dprintk(verbose, FE_ERROR, 1, "(0x%x) write err [%d:%d], rc=[%d]",
 212                         (unsigned int)state->config->tuner_address, start, len, rc);
 213                 return -EREMOTEIO;
 214         }
 215         return 0;
 216 }
 217
 218 static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
 219 {
 220         if (unlikely(reg >= STB6100_NUMREGS)) {
 221                 dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 222                 return -EREMOTEIO;
 223         }
 224         data = (data & stb6100_template[reg].mask) | stb6100_template[reg].set;
 225         return stb6100_write_reg_range(state, &data, reg, 1);
 226 }
 227
 228
 229 static int stb6100_get_status(struct dvb_frontend *fe, u32 *status)
 230 {
 231         int rc;
 232         struct stb6100_state *state = fe->tuner_priv;
 233
 234         rc = stb6100_read_reg(state, STB6100_LD);
 235         if (rc < 0) {
 236                 dprintk(verbose, FE_ERROR, 1, "%s failed", __func__);
 237                 return rc;
 238         }
 239         return (rc & STB6100_LD_LOCK) ? TUNER_STATUS_LOCKED : 0;
 240 }
 241
 242 static int stb6100_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 243 {
 244         int rc;
 245         u8 f;
 246         struct stb6100_state *state = fe->tuner_priv;
 247
 248         rc = stb6100_read_reg(state, STB6100_F);
 249         if (rc < 0)
 250                 return rc;
 251         f = rc & STB6100_F_F;
 252
 253         state->status.bandwidth = (f + 5) * 2000;       /* x2 for ZIF   */
 254
 255         *bandwidth = state->bandwidth = state->status.bandwidth * 1000;
 256         dprintk(verbose, FE_DEBUG, 1, "bandwidth = %u Hz", state->bandwidth);
 257         return 0;
 258 }
 259
 260 static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 261 {
 262         u32 tmp;
 263         int rc;
 264         struct stb6100_state *state = fe->tuner_priv;
 265
 266         dprintk(verbose, FE_DEBUG, 1, "set bandwidth to %u Hz", bandwidth);
 267
 268         bandwidth /= 2; /* ZIF */
 269
 270         if (bandwidth >= 36000000)      /* F[4:0] BW/2 max =31+5=36 mhz for F=31        */
 271                 tmp = 31;
 272         else if (bandwidth <= 5000000)  /* bw/2 min = 5Mhz for F=0                      */
 273                 tmp = 0;
 274         else                            /* if 5 < bw/2 < 36                             */
 275                 tmp = (bandwidth + 500000) / 1000000 - 5;
 276
 277         /* Turn on LPF bandwidth setting clock control,
 278          * set bandwidth, wait 10ms, turn off.
 279          */
 280         rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d | STB6100_FCCK_FCCK);
 281         if (rc < 0)
 282                 return rc;
 283         rc = stb6100_write_reg(state, STB6100_F, 0xc0 | tmp);
 284         if (rc < 0)
 285                 return rc;
 286
 287         msleep(5);  /*  This is dangerous as another (related) thread may start */
 288
 289         rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 290         if (rc < 0)
 291                 return rc;
 292
 293         msleep(10);  /*  This is dangerous as another (related) thread may start */
 294
 295         return 0;
 296 }
 297
 298 static int stb6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 299 {
 300         int rc;
 301         u32 nint, nfrac, fvco;
 302         int psd2, odiv;
 303         struct stb6100_state *state = fe->tuner_priv;
 304         u8 regs[STB6100_NUMREGS];
 305
 306         rc = stb6100_read_regs(state, regs);
 307         if (rc < 0)
 308                 return rc;
 309
 310         odiv = (regs[STB6100_VCO] & STB6100_VCO_ODIV) >> STB6100_VCO_ODIV_SHIFT;
 311         psd2 = (regs[STB6100_K] & STB6100_K_PSD2) >> STB6100_K_PSD2_SHIFT;
 312         nint = regs[STB6100_NI];
 313         nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) | regs[STB6100_NF_LSB];
 314         fvco = (nfrac * state->reference >> (9 - psd2)) + (nint * state->reference << psd2);
 315         *frequency = state->frequency = fvco >> (odiv + 1);
 316
 317         dprintk(verbose, FE_DEBUG, 1,
 318                 "frequency = %u kHz, odiv = %u, psd2 = %u, fxtal = %u kHz, fvco = %u kHz, N(I) = %u, N(F) = %u",
 319                 state->frequency, odiv, psd2, state->reference, fvco, nint, nfrac);
 320         return 0;
 321 }
 322
 323
 324 static int stb6100_set_frequency(struct dvb_frontend *fe, u32 frequency)
 325 {
 326         int rc;
 327         const struct stb6100_lkup *ptr;
 328         struct stb6100_state *state = fe->tuner_priv;
 329         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 330
 331         u32 srate = 0, fvco, nint, nfrac;
 332         u8 regs[STB6100_NUMREGS];
 333         u8 g, psd2, odiv;
 334
 335         dprintk(verbose, FE_DEBUG, 1, "Version 2010-8-14 13:51");
 336
 337         if (fe->ops.get_frontend) {
 338                 dprintk(verbose, FE_DEBUG, 1, "Get frontend parameters");
 339                 fe->ops.get_frontend(fe);
 340         }
 341         srate = p->symbol_rate;
 342
 343         /* Set up tuner cleanly, LPF calibration on */
 344         rc = stb6100_write_reg(state, STB6100_FCCK, 0x4d | STB6100_FCCK_FCCK);
 345         if (rc < 0)
 346                 return rc;  /* allow LPF calibration */
 347
 348         /* PLL Loop disabled, bias on, VCO on, synth on */
 349         regs[STB6100_LPEN] = 0xeb;
 350         rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 351         if (rc < 0)
 352                 return rc;
 353
 354         /* Program the registers with their data values */
 355
 356         /* VCO divide ratio (LO divide ratio, VCO prescaler enable).    */
 357         if (frequency <= 1075000)
 358                 odiv = 1;
 359         else
 360                 odiv = 0;
 361
 362         /* VCO enabled, search clock off as per LL3.7, 3.4.1 */
 363         regs[STB6100_VCO] = 0xe0 | (odiv << STB6100_VCO_ODIV_SHIFT);
 364
 365         /* OSM  */
 366         for (ptr = lkup;
 367              (ptr->val_high != 0) && !CHKRANGE(frequency, ptr->val_low, ptr->val_high);
 368              ptr++);
 369
 370         if (ptr->val_high == 0) {
 371                 printk(KERN_ERR "%s: frequency out of range: %u kHz\n", __func__, frequency);
 372                 return -EINVAL;
 373         }
 374         regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_OSM) | ptr->reg;
 375         rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 376         if (rc < 0)
 377                 return rc;
 378
 379         if ((frequency > 1075000) && (frequency <= 1325000))
 380                 psd2 = 0;
 381         else
 382                 psd2 = 1;
 383         /* F(VCO) = F(LO) * (ODIV == 0 ? 2 : 4)                 */
 384         fvco = frequency << (1 + odiv);
 385         /* N(I) = floor(f(VCO) / (f(XTAL) * (PSD2 ? 2 : 1)))    */
 386         nint = fvco / (state->reference << psd2);
 387         /* N(F) = round(f(VCO) / f(XTAL) * (PSD2 ? 2 : 1) - N(I)) * 2 ^ 9       */
 388         nfrac = DIV_ROUND_CLOSEST((fvco - (nint * state->reference << psd2))
 389                                          << (9 - psd2), state->reference);
 390
 391         /* NI */
 392         regs[STB6100_NI] = nint;
 393         rc = stb6100_write_reg(state, STB6100_NI, regs[STB6100_NI]);
 394         if (rc < 0)
 395                 return rc;
 396
 397         /* NF */
 398         regs[STB6100_NF_LSB] = nfrac;
 399         rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]);
 400         if (rc < 0)
 401                 return rc;
 402
 403         /* K */
 404         regs[STB6100_K] = (0x38 & ~STB6100_K_PSD2) | (psd2 << STB6100_K_PSD2_SHIFT);
 405         regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) | ((nfrac >> 8) & STB6100_K_NF_MSB);
 406         rc = stb6100_write_reg(state, STB6100_K, regs[STB6100_K]);
 407         if (rc < 0)
 408                 return rc;
 409
 410         /* G Baseband gain. */
 411         if (srate >= 15000000)
 412                 g = 9;  /*  +4 dB */
 413         else if (srate >= 5000000)
 414                 g = 11; /*  +8 dB */
 415         else
 416                 g = 14; /* +14 dB */
 417
 418         regs[STB6100_G] = (0x10 & ~STB6100_G_G) | g;
 419         regs[STB6100_G] &= ~STB6100_G_GCT; /* mask GCT */
 420         regs[STB6100_G] |= (1 << 5); /* 2Vp-p Mode */
 421         rc = stb6100_write_reg(state, STB6100_G, regs[STB6100_G]);
 422         if (rc < 0)
 423                 return rc;
 424
 425         /* F we don't write as it is set up in BW set */
 426
 427         /* DLB set DC servo loop BW to 160Hz (LLA 3.8 / 2.1) */
 428         regs[STB6100_DLB] = 0xcc;
 429         rc = stb6100_write_reg(state, STB6100_DLB, regs[STB6100_DLB]);
 430         if (rc < 0)
 431                 return rc;
 432
 433         dprintk(verbose, FE_DEBUG, 1,
 434                 "frequency = %u, srate = %u, g = %u, odiv = %u, psd2 = %u, fxtal = %u, osm = %u, fvco = %u, N(I) = %u, N(F) = %u",
 435                 frequency, srate, (unsigned int)g, (unsigned int)odiv,
 436                 (unsigned int)psd2, state->reference,
 437                 ptr->reg, fvco, nint, nfrac);
 438
 439         /* Set up the test registers */
 440         regs[STB6100_TEST1] = 0x8f;
 441         rc = stb6100_write_reg(state, STB6100_TEST1, regs[STB6100_TEST1]);
 442         if (rc < 0)
 443                 return rc;
 444         regs[STB6100_TEST3] = 0xde;
 445         rc = stb6100_write_reg(state, STB6100_TEST3, regs[STB6100_TEST3]);
 446         if (rc < 0)
 447                 return rc;
 448
 449         /* Bring up tuner according to LLA 3.7 3.4.1, step 2 */
 450         regs[STB6100_LPEN] = 0xfb; /* PLL Loop enabled, bias on, VCO on, synth on */
 451         rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 452         if (rc < 0)
 453                 return rc;
 454
 455         msleep(2);
 456
 457         /* Bring up tuner according to LLA 3.7 3.4.1, step 3 */
 458         regs[STB6100_VCO] &= ~STB6100_VCO_OCK;          /* VCO fast search              */
 459         rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 460         if (rc < 0)
 461                 return rc;
 462
 463         msleep(10);  /*  This is dangerous as another (related) thread may start */ /* wait for LO to lock */
 464
 465         regs[STB6100_VCO] &= ~STB6100_VCO_OSCH;         /* vco search disabled          */
 466         regs[STB6100_VCO] |= STB6100_VCO_OCK;           /* search clock off             */
 467         rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 468         if (rc < 0)
 469                 return rc;
 470
 471         rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 472         if (rc < 0)
 473                 return rc;  /* Stop LPF calibration */
 474
 475         msleep(10);  /*  This is dangerous as another (related) thread may start */
 476                      /* wait for stabilisation, (should not be necessary)               */
 477         return 0;
 478 }
 479
 480 static int stb6100_sleep(struct dvb_frontend *fe)
 481 {
 482         /* TODO: power down     */
 483         return 0;
 484 }
 485
 486 static int stb6100_init(struct dvb_frontend *fe)
 487 {
 488         struct stb6100_state *state = fe->tuner_priv;
 489         struct tuner_state *status = &state->status;
 490
 491         status->tunerstep       = 125000;
 492         status->ifreq           = 0;
 493         status->refclock        = 27000000;     /* Hz   */
 494         status->iqsense         = 1;
 495         status->bandwidth       = 36000;        /* kHz  */
 496         state->bandwidth        = status->bandwidth * 1000;     /* Hz   */
 497         state->reference        = status->refclock / 1000;      /* kHz  */
 498
 499         /* Set default bandwidth. Modified, PN 13-May-10        */
 500         return 0;
 501 }
 502
 503 static int stb6100_get_state(struct dvb_frontend *fe,
 504                              enum tuner_param param,
 505                              struct tuner_state *state)
 506 {
 507         switch (param) {
 508         case DVBFE_TUNER_FREQUENCY:
 509                 stb6100_get_frequency(fe, &state->frequency);
 510                 break;
 511         case DVBFE_TUNER_TUNERSTEP:
 512                 break;
 513         case DVBFE_TUNER_IFFREQ:
 514                 break;
 515         case DVBFE_TUNER_BANDWIDTH:
 516                 stb6100_get_bandwidth(fe, &state->bandwidth);
 517                 break;
 518         case DVBFE_TUNER_REFCLOCK:
 519                 break;
 520         default:
 521                 break;
 522         }
 523
 524         return 0;
 525 }
 526
 527 static int stb6100_set_state(struct dvb_frontend *fe,
 528                              enum tuner_param param,
 529                              struct tuner_state *state)
 530 {
 531         struct stb6100_state *tstate = fe->tuner_priv;
 532
 533         switch (param) {
 534         case DVBFE_TUNER_FREQUENCY:
 535                 stb6100_set_frequency(fe, state->frequency);
 536                 tstate->frequency = state->frequency;
 537                 break;
 538         case DVBFE_TUNER_TUNERSTEP:
 539                 break;
 540         case DVBFE_TUNER_IFFREQ:
 541                 break;
 542         case DVBFE_TUNER_BANDWIDTH:
 543                 stb6100_set_bandwidth(fe, state->bandwidth);
 544                 tstate->bandwidth = state->bandwidth;
 545                 break;
 546         case DVBFE_TUNER_REFCLOCK:
 547                 break;
 548         default:
 549                 break;
 550         }
 551
 552         return 0;
 553 }
 554
 555 static struct dvb_tuner_ops stb6100_ops = {
 556         .info = {
 557                 .name                   = "STB6100 Silicon Tuner",
 558                 .frequency_min          = 950000,
 559                 .frequency_max          = 2150000,
 560                 .frequency_step         = 0,
 561         },
 562
 563         .init           = stb6100_init,
 564         .sleep          = stb6100_sleep,
 565         .get_status     = stb6100_get_status,
 566         .get_state      = stb6100_get_state,
 567         .set_state      = stb6100_set_state,
 568         .release        = stb6100_release
 569 };
 570
 571 struct dvb_frontend *stb6100_attach(struct dvb_frontend *fe,
 572                                     const struct stb6100_config *config,
 573                                     struct i2c_adapter *i2c)
 574 {
 575         struct stb6100_state *state = NULL;
 576
 577         state = kzalloc(sizeof (struct stb6100_state), GFP_KERNEL);
 578         if (!state)
 579                 return NULL;
 580
 581         state->config           = config;
 582         state->i2c              = i2c;
 583         state->frontend         = fe;
 584         state->reference        = config->refclock / 1000; /* kHz */
 585         fe->tuner_priv          = state;
 586         fe->ops.tuner_ops       = stb6100_ops;
 587
 588         printk("%s: Attaching STB6100 \n", __func__);
 589         return fe;
 590 }
 591
 592 static int stb6100_release(struct dvb_frontend *fe)
 593 {
 594         struct stb6100_state *state = fe->tuner_priv;
 595
 596         fe->tuner_priv = NULL;
 597         kfree(state);
 598
 599         return 0;
 600 }
 601
 602 EXPORT_SYMBOL(stb6100_attach);
 603 MODULE_PARM_DESC(verbose, "Set Verbosity level");
 604
 605 MODULE_AUTHOR("Manu Abraham");
 606 MODULE_DESCRIPTION("STB6100 Silicon tuner");
 607 MODULE_LICENSE("GPL");