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 <media/dvb_frontend.h>
  29 #include "stb6100.h"
  30
  31 static unsigned int verbose;
  32 module_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
  58 struct stb6100_lkup {
  59         u32 val_low;
  60         u32 val_high;
  61         u8   reg;
  62 };
  63
  64 static void stb6100_release(struct dvb_frontend *fe);
  65
  66 static 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.   */
  84 static 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  */
 102 struct stb6100_regmask {
 103         u8 mask;
 104         u8 set;
 105 };
 106
 107 static 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  */
 125 static 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
 133 static 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
 160 static 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
 185 static 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
 227 static int stb6100_write_reg(struct stb6100_state *state, u8 reg, u8 data)
 228 {
 229         u8 tmp = data; /* see gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 */
 230
 231         if (unlikely(reg >= STB6100_NUMREGS)) {
 232                 dprintk(verbose, FE_ERROR, 1, "Invalid register offset 0x%x", reg);
 233                 return -EREMOTEIO;
 234         }
 235         tmp = (tmp & stb6100_template[reg].mask) | stb6100_template[reg].set;
 236         return stb6100_write_reg_range(state, &tmp, reg, 1);
 237 }
 238
 239
 240 static int stb6100_get_status(struct dvb_frontend *fe, u32 *status)
 241 {
 242         int rc;
 243         struct stb6100_state *state = fe->tuner_priv;
 244
 245         rc = stb6100_read_reg(state, STB6100_LD);
 246         if (rc < 0) {
 247                 dprintk(verbose, FE_ERROR, 1, "%s failed", __func__);
 248                 return rc;
 249         }
 250         return (rc & STB6100_LD_LOCK) ? TUNER_STATUS_LOCKED : 0;
 251 }
 252
 253 static int stb6100_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 254 {
 255         int rc;
 256         u8 f;
 257         u32 bw;
 258         struct stb6100_state *state = fe->tuner_priv;
 259
 260         rc = stb6100_read_reg(state, STB6100_F);
 261         if (rc < 0)
 262                 return rc;
 263         f = rc & STB6100_F_F;
 264
 265         bw = (f + 5) * 2000;    /* x2 for ZIF   */
 266
 267         *bandwidth = state->bandwidth = bw * 1000;
 268         dprintk(verbose, FE_DEBUG, 1, "bandwidth = %u Hz", state->bandwidth);
 269         return 0;
 270 }
 271
 272 static int stb6100_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 273 {
 274         u32 tmp;
 275         int rc;
 276         struct stb6100_state *state = fe->tuner_priv;
 277
 278         dprintk(verbose, FE_DEBUG, 1, "set bandwidth to %u Hz", bandwidth);
 279
 280         bandwidth /= 2; /* ZIF */
 281
 282         if (bandwidth >= 36000000)      /* F[4:0] BW/2 max =31+5=36 mhz for F=31        */
 283                 tmp = 31;
 284         else if (bandwidth <= 5000000)  /* bw/2 min = 5Mhz for F=0                      */
 285                 tmp = 0;
 286         else                            /* if 5 < bw/2 < 36                             */
 287                 tmp = (bandwidth + 500000) / 1000000 - 5;
 288
 289         /* Turn on LPF bandwidth setting clock control,
 290          * set bandwidth, wait 10ms, turn off.
 291          */
 292         rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d | STB6100_FCCK_FCCK);
 293         if (rc < 0)
 294                 return rc;
 295         rc = stb6100_write_reg(state, STB6100_F, 0xc0 | tmp);
 296         if (rc < 0)
 297                 return rc;
 298
 299         msleep(5);  /*  This is dangerous as another (related) thread may start */
 300
 301         rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 302         if (rc < 0)
 303                 return rc;
 304
 305         msleep(10);  /*  This is dangerous as another (related) thread may start */
 306
 307         return 0;
 308 }
 309
 310 static int stb6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 311 {
 312         int rc;
 313         u32 nint, nfrac, fvco;
 314         int psd2, odiv;
 315         struct stb6100_state *state = fe->tuner_priv;
 316         u8 regs[STB6100_NUMREGS];
 317
 318         rc = stb6100_read_regs(state, regs);
 319         if (rc < 0)
 320                 return rc;
 321
 322         odiv = (regs[STB6100_VCO] & STB6100_VCO_ODIV) >> STB6100_VCO_ODIV_SHIFT;
 323         psd2 = (regs[STB6100_K] & STB6100_K_PSD2) >> STB6100_K_PSD2_SHIFT;
 324         nint = regs[STB6100_NI];
 325         nfrac = ((regs[STB6100_K] & STB6100_K_NF_MSB) << 8) | regs[STB6100_NF_LSB];
 326         fvco = (nfrac * state->reference >> (9 - psd2)) + (nint * state->reference << psd2);
 327         *frequency = state->frequency = fvco >> (odiv + 1);
 328
 329         dprintk(verbose, FE_DEBUG, 1,
 330                 "frequency = %u kHz, odiv = %u, psd2 = %u, fxtal = %u kHz, fvco = %u kHz, N(I) = %u, N(F) = %u",
 331                 state->frequency, odiv, psd2, state->reference, fvco, nint, nfrac);
 332         return 0;
 333 }
 334
 335
 336 static int stb6100_set_frequency(struct dvb_frontend *fe, u32 frequency)
 337 {
 338         int rc;
 339         const struct stb6100_lkup *ptr;
 340         struct stb6100_state *state = fe->tuner_priv;
 341         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 342
 343         u32 srate = 0, fvco, nint, nfrac;
 344         u8 regs[STB6100_NUMREGS];
 345         u8 g, psd2, odiv;
 346
 347         dprintk(verbose, FE_DEBUG, 1, "Version 2010-8-14 13:51");
 348
 349         if (fe->ops.get_frontend) {
 350                 dprintk(verbose, FE_DEBUG, 1, "Get frontend parameters");
 351                 fe->ops.get_frontend(fe, p);
 352         }
 353         srate = p->symbol_rate;
 354
 355         /* Set up tuner cleanly, LPF calibration on */
 356         rc = stb6100_write_reg(state, STB6100_FCCK, 0x4d | STB6100_FCCK_FCCK);
 357         if (rc < 0)
 358                 return rc;  /* allow LPF calibration */
 359
 360         /* PLL Loop disabled, bias on, VCO on, synth on */
 361         regs[STB6100_LPEN] = 0xeb;
 362         rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 363         if (rc < 0)
 364                 return rc;
 365
 366         /* Program the registers with their data values */
 367
 368         /* VCO divide ratio (LO divide ratio, VCO prescaler enable).    */
 369         if (frequency <= 1075000)
 370                 odiv = 1;
 371         else
 372                 odiv = 0;
 373
 374         /* VCO enabled, search clock off as per LL3.7, 3.4.1 */
 375         regs[STB6100_VCO] = 0xe0 | (odiv << STB6100_VCO_ODIV_SHIFT);
 376
 377         /* OSM  */
 378         for (ptr = lkup;
 379              (ptr->val_high != 0) && !CHKRANGE(frequency, ptr->val_low, ptr->val_high);
 380              ptr++);
 381
 382         if (ptr->val_high == 0) {
 383                 printk(KERN_ERR "%s: frequency out of range: %u kHz\n", __func__, frequency);
 384                 return -EINVAL;
 385         }
 386         regs[STB6100_VCO] = (regs[STB6100_VCO] & ~STB6100_VCO_OSM) | ptr->reg;
 387         rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 388         if (rc < 0)
 389                 return rc;
 390
 391         if ((frequency > 1075000) && (frequency <= 1325000))
 392                 psd2 = 0;
 393         else
 394                 psd2 = 1;
 395         /* F(VCO) = F(LO) * (ODIV == 0 ? 2 : 4)                 */
 396         fvco = frequency << (1 + odiv);
 397         /* N(I) = floor(f(VCO) / (f(XTAL) * (PSD2 ? 2 : 1)))    */
 398         nint = fvco / (state->reference << psd2);
 399         /* N(F) = round(f(VCO) / f(XTAL) * (PSD2 ? 2 : 1) - N(I)) * 2 ^ 9       */
 400         nfrac = DIV_ROUND_CLOSEST((fvco - (nint * state->reference << psd2))
 401                                          << (9 - psd2), state->reference);
 402
 403         /* NI */
 404         regs[STB6100_NI] = nint;
 405         rc = stb6100_write_reg(state, STB6100_NI, regs[STB6100_NI]);
 406         if (rc < 0)
 407                 return rc;
 408
 409         /* NF */
 410         regs[STB6100_NF_LSB] = nfrac;
 411         rc = stb6100_write_reg(state, STB6100_NF_LSB, regs[STB6100_NF_LSB]);
 412         if (rc < 0)
 413                 return rc;
 414
 415         /* K */
 416         regs[STB6100_K] = (0x38 & ~STB6100_K_PSD2) | (psd2 << STB6100_K_PSD2_SHIFT);
 417         regs[STB6100_K] = (regs[STB6100_K] & ~STB6100_K_NF_MSB) | ((nfrac >> 8) & STB6100_K_NF_MSB);
 418         rc = stb6100_write_reg(state, STB6100_K, regs[STB6100_K]);
 419         if (rc < 0)
 420                 return rc;
 421
 422         /* G Baseband gain. */
 423         if (srate >= 15000000)
 424                 g = 9;  /*  +4 dB */
 425         else if (srate >= 5000000)
 426                 g = 11; /*  +8 dB */
 427         else
 428                 g = 14; /* +14 dB */
 429
 430         regs[STB6100_G] = (0x10 & ~STB6100_G_G) | g;
 431         regs[STB6100_G] &= ~STB6100_G_GCT; /* mask GCT */
 432         regs[STB6100_G] |= (1 << 5); /* 2Vp-p Mode */
 433         rc = stb6100_write_reg(state, STB6100_G, regs[STB6100_G]);
 434         if (rc < 0)
 435                 return rc;
 436
 437         /* F we don't write as it is set up in BW set */
 438
 439         /* DLB set DC servo loop BW to 160Hz (LLA 3.8 / 2.1) */
 440         regs[STB6100_DLB] = 0xcc;
 441         rc = stb6100_write_reg(state, STB6100_DLB, regs[STB6100_DLB]);
 442         if (rc < 0)
 443                 return rc;
 444
 445         dprintk(verbose, FE_DEBUG, 1,
 446                 "frequency = %u, srate = %u, g = %u, odiv = %u, psd2 = %u, fxtal = %u, osm = %u, fvco = %u, N(I) = %u, N(F) = %u",
 447                 frequency, srate, (unsigned int)g, (unsigned int)odiv,
 448                 (unsigned int)psd2, state->reference,
 449                 ptr->reg, fvco, nint, nfrac);
 450
 451         /* Set up the test registers */
 452         regs[STB6100_TEST1] = 0x8f;
 453         rc = stb6100_write_reg(state, STB6100_TEST1, regs[STB6100_TEST1]);
 454         if (rc < 0)
 455                 return rc;
 456         regs[STB6100_TEST3] = 0xde;
 457         rc = stb6100_write_reg(state, STB6100_TEST3, regs[STB6100_TEST3]);
 458         if (rc < 0)
 459                 return rc;
 460
 461         /* Bring up tuner according to LLA 3.7 3.4.1, step 2 */
 462         regs[STB6100_LPEN] = 0xfb; /* PLL Loop enabled, bias on, VCO on, synth on */
 463         rc = stb6100_write_reg(state, STB6100_LPEN, regs[STB6100_LPEN]);
 464         if (rc < 0)
 465                 return rc;
 466
 467         msleep(2);
 468
 469         /* Bring up tuner according to LLA 3.7 3.4.1, step 3 */
 470         regs[STB6100_VCO] &= ~STB6100_VCO_OCK;          /* VCO fast search              */
 471         rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 472         if (rc < 0)
 473                 return rc;
 474
 475         msleep(10);  /*  This is dangerous as another (related) thread may start */ /* wait for LO to lock */
 476
 477         regs[STB6100_VCO] &= ~STB6100_VCO_OSCH;         /* vco search disabled          */
 478         regs[STB6100_VCO] |= STB6100_VCO_OCK;           /* search clock off             */
 479         rc = stb6100_write_reg(state, STB6100_VCO, regs[STB6100_VCO]);
 480         if (rc < 0)
 481                 return rc;
 482
 483         rc = stb6100_write_reg(state, STB6100_FCCK, 0x0d);
 484         if (rc < 0)
 485                 return rc;  /* Stop LPF calibration */
 486
 487         msleep(10);  /*  This is dangerous as another (related) thread may start */
 488                      /* wait for stabilisation, (should not be necessary)               */
 489         return 0;
 490 }
 491
 492 static int stb6100_sleep(struct dvb_frontend *fe)
 493 {
 494         /* TODO: power down     */
 495         return 0;
 496 }
 497
 498 static int stb6100_init(struct dvb_frontend *fe)
 499 {
 500         struct stb6100_state *state = fe->tuner_priv;
 501         int refclk = 27000000; /* Hz */
 502
 503         /*
 504          * iqsense = 1
 505          * tunerstep = 125000
 506          */
 507         state->bandwidth        = 36000000;             /* Hz   */
 508         state->reference        = refclk / 1000;        /* kHz  */
 509
 510         /* Set default bandwidth. Modified, PN 13-May-10        */
 511         return 0;
 512 }
 513
 514 static int stb6100_set_params(struct dvb_frontend *fe)
 515 {
 516         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 517
 518         if (c->frequency > 0)
 519                 stb6100_set_frequency(fe, c->frequency);
 520
 521         if (c->bandwidth_hz > 0)
 522                 stb6100_set_bandwidth(fe, c->bandwidth_hz);
 523
 524         return 0;
 525 }
 526
 527 static const struct dvb_tuner_ops stb6100_ops = {
 528         .info = {
 529                 .name                   = "STB6100 Silicon Tuner",
 530                 .frequency_min_hz       =  950 * MHz,
 531                 .frequency_max_hz       = 2150 * MHz,
 532         },
 533
 534         .init           = stb6100_init,
 535         .sleep          = stb6100_sleep,
 536         .get_status     = stb6100_get_status,
 537         .set_params     = stb6100_set_params,
 538         .get_frequency  = stb6100_get_frequency,
 539         .get_bandwidth  = stb6100_get_bandwidth,
 540         .release        = stb6100_release
 541 };
 542
 543 struct dvb_frontend *stb6100_attach(struct dvb_frontend *fe,
 544                                     const struct stb6100_config *config,
 545                                     struct i2c_adapter *i2c)
 546 {
 547         struct stb6100_state *state = NULL;
 548
 549         state = kzalloc(sizeof (struct stb6100_state), GFP_KERNEL);
 550         if (!state)
 551                 return NULL;
 552
 553         state->config           = config;
 554         state->i2c              = i2c;
 555         state->frontend         = fe;
 556         state->reference        = config->refclock / 1000; /* kHz */
 557         fe->tuner_priv          = state;
 558         fe->ops.tuner_ops       = stb6100_ops;
 559
 560         printk("%s: Attaching STB6100 \n", __func__);
 561         return fe;
 562 }
 563
 564 static void stb6100_release(struct dvb_frontend *fe)
 565 {
 566         struct stb6100_state *state = fe->tuner_priv;
 567
 568         fe->tuner_priv = NULL;
 569         kfree(state);
 570 }
 571
 572 EXPORT_SYMBOL(stb6100_attach);
 573 MODULE_PARM_DESC(verbose, "Set Verbosity level");
 574
 575 MODULE_AUTHOR("Manu Abraham");
 576 MODULE_DESCRIPTION("STB6100 Silicon tuner");
 577 MODULE_LICENSE("GPL");