drivers/media/dvb/frontends/stv6110x.c

   1 /*
   2         STV6110(A) Silicon tuner driver
   3
   4         Copyright (C) Manu Abraham <abraham.manu@gmail.com>
   5
   6         Copyright (C) ST Microelectronics
   7
   8         This program is free software; you can redistribute it and/or modify
   9         it under the terms of the GNU General Public License as published by
  10         the Free Software Foundation; either version 2 of the License, or
  11         (at your option) any later version.
  12
  13         This program is distributed in the hope that it will be useful,
  14         but WITHOUT ANY WARRANTY; without even the implied warranty of
  15         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16         GNU General Public License for more details.
  17
  18         You should have received a copy of the GNU General Public License
  19         along with this program; if not, write to the Free Software
  20         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include <linux/init.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27 #include <linux/string.h>
  28
  29 #include "dvb_frontend.h"
  30
  31 #include "stv6110x_reg.h"
  32 #include "stv6110x.h"
  33 #include "stv6110x_priv.h"
  34
  35 static unsigned int verbose;
  36 module_param(verbose, int, 0644);
  37 MODULE_PARM_DESC(verbose, "Set Verbosity level");
  38
  39 static int stv6110x_read_reg(struct stv6110x_state *stv6110x, u8 reg, u8 *data)
  40 {
  41         int ret;
  42         const struct stv6110x_config *config = stv6110x->config;
  43         u8 b0[] = { reg };
  44         u8 b1[] = { 0 };
  45         struct i2c_msg msg[] = {
  46                 { .addr = config->addr, .flags = 0,        .buf = b0, .len = 1 },
  47                 { .addr = config->addr, .flags = I2C_M_RD, .buf = b1, .len = 1 }
  48         };
  49
  50         ret = i2c_transfer(stv6110x->i2c, msg, 2);
  51         if (ret != 2) {
  52                 dprintk(FE_ERROR, 1, "I/O Error");
  53                 return -EREMOTEIO;
  54         }
  55         *data = b1[0];
  56
  57         return 0;
  58 }
  59
  60 static int stv6110x_write_regs(struct stv6110x_state *stv6110x, int start, u8 data[], int len)
  61 {
  62         int ret;
  63         const struct stv6110x_config *config = stv6110x->config;
  64         u8 buf[len + 1];
  65         struct i2c_msg msg = {
  66                 .addr = config->addr,
  67                 .flags = 0,
  68                 .buf = buf,
  69                 .len = len + 1
  70         };
  71
  72         if (start + len > 8)
  73                 return -EINVAL;
  74
  75         buf[0] = start;
  76         memcpy(&buf[1], data, len);
  77
  78         ret = i2c_transfer(stv6110x->i2c, &msg, 1);
  79         if (ret != 1) {
  80                 dprintk(FE_ERROR, 1, "I/O Error");
  81                 return -EREMOTEIO;
  82         }
  83
  84         return 0;
  85 }
  86
  87 static int stv6110x_write_reg(struct stv6110x_state *stv6110x, u8 reg, u8 data)
  88 {
  89         return stv6110x_write_regs(stv6110x, reg, &data, 1);
  90 }
  91
  92 static int stv6110x_init(struct dvb_frontend *fe)
  93 {
  94         struct stv6110x_state *stv6110x = fe->tuner_priv;
  95         int ret;
  96
  97         ret = stv6110x_write_regs(stv6110x, 0, stv6110x->regs,
  98                                   ARRAY_SIZE(stv6110x->regs));
  99         if (ret < 0) {
 100                 dprintk(FE_ERROR, 1, "Initialization failed");
 101                 return -1;
 102         }
 103
 104         return 0;
 105 }
 106
 107 static int stv6110x_set_frequency(struct dvb_frontend *fe, u32 frequency)
 108 {
 109         struct stv6110x_state *stv6110x = fe->tuner_priv;
 110         u32 rDiv, divider;
 111         s32 pVal, pCalc, rDivOpt = 0, pCalcOpt = 1000;
 112         u8 i;
 113
 114         STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_K, (REFCLOCK_MHz - 16));
 115
 116         if (frequency <= 1023000) {
 117                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
 118                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
 119                 pVal = 40;
 120         } else if (frequency <= 1300000) {
 121                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 1);
 122                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
 123                 pVal = 40;
 124         } else if (frequency <= 2046000) {
 125                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
 126                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 0);
 127                 pVal = 20;
 128         } else {
 129                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_DIV4SEL, 0);
 130                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_PRESC32_ON, 1);
 131                 pVal = 20;
 132         }
 133
 134         for (rDiv = 0; rDiv <= 3; rDiv++) {
 135                 pCalc = (REFCLOCK_kHz / 100) / R_DIV(rDiv);
 136
 137                 if ((abs((s32)(pCalc - pVal))) < (abs((s32)(pCalcOpt - pVal))))
 138                         rDivOpt = rDiv;
 139
 140                 pCalcOpt = (REFCLOCK_kHz / 100) / R_DIV(rDivOpt);
 141         }
 142
 143         divider = (frequency * R_DIV(rDivOpt) * pVal) / REFCLOCK_kHz;
 144         divider = (divider + 5) / 10;
 145
 146         STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_R_DIV, rDivOpt);
 147         STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG1], TNG1_N_DIV_11_8, MSB(divider));
 148         STV6110x_SETFIELD(stv6110x->regs[STV6110x_TNG0], TNG0_N_DIV_7_0, LSB(divider));
 149
 150         /* VCO Auto calibration */
 151         STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALVCO_STRT, 1);
 152
 153         stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
 154         stv6110x_write_reg(stv6110x, STV6110x_TNG1, stv6110x->regs[STV6110x_TNG1]);
 155         stv6110x_write_reg(stv6110x, STV6110x_TNG0, stv6110x->regs[STV6110x_TNG0]);
 156         stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);
 157
 158         for (i = 0; i < TRIALS; i++) {
 159                 stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
 160                 if (!STV6110x_GETFIELD(STAT1_CALVCO_STRT, stv6110x->regs[STV6110x_STAT1]))
 161                                 break;
 162                 msleep(1);
 163         }
 164
 165         return 0;
 166 }
 167
 168 static int stv6110x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 169 {
 170         struct stv6110x_state *stv6110x = fe->tuner_priv;
 171
 172         stv6110x_read_reg(stv6110x, STV6110x_TNG1, &stv6110x->regs[STV6110x_TNG1]);
 173         stv6110x_read_reg(stv6110x, STV6110x_TNG0, &stv6110x->regs[STV6110x_TNG0]);
 174
 175         *frequency = (MAKEWORD16(STV6110x_GETFIELD(TNG1_N_DIV_11_8, stv6110x->regs[STV6110x_TNG1]),
 176                                  STV6110x_GETFIELD(TNG0_N_DIV_7_0, stv6110x->regs[STV6110x_TNG0]))) * REFCLOCK_kHz;
 177
 178         *frequency /= (1 << (STV6110x_GETFIELD(TNG1_R_DIV, stv6110x->regs[STV6110x_TNG1]) +
 179                              STV6110x_GETFIELD(TNG1_DIV4SEL, stv6110x->regs[STV6110x_TNG1])));
 180
 181         *frequency >>= 2;
 182
 183         return 0;
 184 }
 185
 186 static int stv6110x_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 187 {
 188         struct stv6110x_state *stv6110x = fe->tuner_priv;
 189         u32 halfbw;
 190         u8 i;
 191
 192         halfbw = bandwidth >> 1;
 193
 194         if (halfbw > 36000000)
 195                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 31); /* LPF */
 196         else if (halfbw < 5000000)
 197                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, 0); /* LPF */
 198         else
 199                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_CF, ((halfbw / 1000000) - 5)); /* LPF */
 200
 201
 202         STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x0); /* cal. clk activated */
 203         STV6110x_SETFIELD(stv6110x->regs[STV6110x_STAT1], STAT1_CALRC_STRT, 0x1); /* LPF auto cal */
 204
 205         stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);
 206         stv6110x_write_reg(stv6110x, STV6110x_STAT1, stv6110x->regs[STV6110x_STAT1]);
 207
 208         for (i = 0; i < TRIALS; i++) {
 209                 stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
 210                 if (!STV6110x_GETFIELD(STAT1_CALRC_STRT, stv6110x->regs[STV6110x_STAT1]))
 211                         break;
 212                 msleep(1);
 213         }
 214         STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL3], CTRL3_RCCLK_OFF, 0x1); /* cal. done */
 215         stv6110x_write_reg(stv6110x, STV6110x_CTRL3, stv6110x->regs[STV6110x_CTRL3]);
 216
 217         return 0;
 218 }
 219
 220 static int stv6110x_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 221 {
 222         struct stv6110x_state *stv6110x = fe->tuner_priv;
 223
 224         stv6110x_read_reg(stv6110x, STV6110x_CTRL3, &stv6110x->regs[STV6110x_CTRL3]);
 225         *bandwidth = (STV6110x_GETFIELD(CTRL3_CF, stv6110x->regs[STV6110x_CTRL3]) + 5) * 2000000;
 226
 227         return 0;
 228 }
 229
 230 static int stv6110x_set_refclock(struct dvb_frontend *fe, u32 refclock)
 231 {
 232         struct stv6110x_state *stv6110x = fe->tuner_priv;
 233
 234         /* setup divider */
 235         switch (refclock) {
 236         default:
 237         case 1:
 238                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
 239                 break;
 240         case 2:
 241                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
 242                 break;
 243         case 4:
 244                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
 245                 break;
 246         case 8:
 247         case 0:
 248                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
 249                 break;
 250         }
 251         stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);
 252
 253         return 0;
 254 }
 255
 256 static int stv6110x_get_bbgain(struct dvb_frontend *fe, u32 *gain)
 257 {
 258         struct stv6110x_state *stv6110x = fe->tuner_priv;
 259
 260         stv6110x_read_reg(stv6110x, STV6110x_CTRL2, &stv6110x->regs[STV6110x_CTRL2]);
 261         *gain = 2 * STV6110x_GETFIELD(CTRL2_BBGAIN, stv6110x->regs[STV6110x_CTRL2]);
 262
 263         return 0;
 264 }
 265
 266 static int stv6110x_set_bbgain(struct dvb_frontend *fe, u32 gain)
 267 {
 268         struct stv6110x_state *stv6110x = fe->tuner_priv;
 269
 270         STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_BBGAIN, gain / 2);
 271         stv6110x_write_reg(stv6110x, STV6110x_CTRL2, stv6110x->regs[STV6110x_CTRL2]);
 272
 273         return 0;
 274 }
 275
 276 static int stv6110x_set_mode(struct dvb_frontend *fe, enum tuner_mode mode)
 277 {
 278         struct stv6110x_state *stv6110x = fe->tuner_priv;
 279         int ret;
 280
 281         switch (mode) {
 282         case TUNER_SLEEP:
 283                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 0);
 284                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 0);
 285                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 0);
 286                 break;
 287
 288         case TUNER_WAKE:
 289                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_SYN, 1);
 290                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_RX, 1);
 291                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL1], CTRL1_LPT, 1);
 292                 break;
 293         }
 294
 295         ret = stv6110x_write_reg(stv6110x, STV6110x_CTRL1, stv6110x->regs[STV6110x_CTRL1]);
 296         if (ret < 0) {
 297                 dprintk(FE_ERROR, 1, "I/O Error");
 298                 return -EIO;
 299         }
 300
 301         return 0;
 302 }
 303
 304 static int stv6110x_sleep(struct dvb_frontend *fe)
 305 {
 306         if (fe->tuner_priv)
 307                 return stv6110x_set_mode(fe, TUNER_SLEEP);
 308
 309         return 0;
 310 }
 311
 312 static int stv6110x_get_status(struct dvb_frontend *fe, u32 *status)
 313 {
 314         struct stv6110x_state *stv6110x = fe->tuner_priv;
 315
 316         stv6110x_read_reg(stv6110x, STV6110x_STAT1, &stv6110x->regs[STV6110x_STAT1]);
 317
 318         if (STV6110x_GETFIELD(STAT1_LOCK, stv6110x->regs[STV6110x_STAT1]))
 319                 *status = TUNER_PHASELOCKED;
 320         else
 321                 *status = 0;
 322
 323         return 0;
 324 }
 325
 326
 327 static int stv6110x_release(struct dvb_frontend *fe)
 328 {
 329         struct stv6110x_state *stv6110x = fe->tuner_priv;
 330
 331         fe->tuner_priv = NULL;
 332         kfree(stv6110x);
 333
 334         return 0;
 335 }
 336
 337 static struct dvb_tuner_ops stv6110x_ops = {
 338         .info = {
 339                 .name           = "STV6110(A) Silicon Tuner",
 340                 .frequency_min  =  950000,
 341                 .frequency_max  = 2150000,
 342                 .frequency_step = 0,
 343         },
 344         .release                = stv6110x_release
 345 };
 346
 347 static struct stv6110x_devctl stv6110x_ctl = {
 348         .tuner_init             = stv6110x_init,
 349         .tuner_sleep            = stv6110x_sleep,
 350         .tuner_set_mode         = stv6110x_set_mode,
 351         .tuner_set_frequency    = stv6110x_set_frequency,
 352         .tuner_get_frequency    = stv6110x_get_frequency,
 353         .tuner_set_bandwidth    = stv6110x_set_bandwidth,
 354         .tuner_get_bandwidth    = stv6110x_get_bandwidth,
 355         .tuner_set_bbgain       = stv6110x_set_bbgain,
 356         .tuner_get_bbgain       = stv6110x_get_bbgain,
 357         .tuner_set_refclk       = stv6110x_set_refclock,
 358         .tuner_get_status       = stv6110x_get_status,
 359 };
 360
 361 struct stv6110x_devctl *stv6110x_attach(struct dvb_frontend *fe,
 362                                         const struct stv6110x_config *config,
 363                                         struct i2c_adapter *i2c)
 364 {
 365         struct stv6110x_state *stv6110x;
 366         u8 default_regs[] = {0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e};
 367
 368         stv6110x = kzalloc(sizeof (struct stv6110x_state), GFP_KERNEL);
 369         if (!stv6110x)
 370                 return NULL;
 371
 372         stv6110x->i2c           = i2c;
 373         stv6110x->config        = config;
 374         stv6110x->devctl        = &stv6110x_ctl;
 375         memcpy(stv6110x->regs, default_regs, 8);
 376
 377         /* setup divider */
 378         switch (stv6110x->config->clk_div) {
 379         default:
 380         case 1:
 381                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 0);
 382                 break;
 383         case 2:
 384                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 1);
 385                 break;
 386         case 4:
 387                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 2);
 388                 break;
 389         case 8:
 390         case 0:
 391                 STV6110x_SETFIELD(stv6110x->regs[STV6110x_CTRL2], CTRL2_CO_DIV, 3);
 392                 break;
 393         }
 394
 395         fe->tuner_priv          = stv6110x;
 396         fe->ops.tuner_ops       = stv6110x_ops;
 397
 398         printk(KERN_INFO "%s: Attaching STV6110x\n", __func__);
 399         return stv6110x->devctl;
 400 }
 401 EXPORT_SYMBOL(stv6110x_attach);
 402
 403 MODULE_AUTHOR("Manu Abraham");
 404 MODULE_DESCRIPTION("STV6110x Silicon tuner");
 405 MODULE_LICENSE("GPL");