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   1 /*
   2  * stv6110.c
   3  *
   4  * Driver for ST STV6110 satellite tuner IC.
   5  *
   6  * Copyright (C) 2009 NetUP Inc.
   7  * Copyright (C) 2009 Igor M. Liplianin <liplianin@netup.ru>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include <linux/slab.h>
  26 #include <linux/module.h>
  27 #include <linux/dvb/frontend.h>
  28
  29 #include <linux/types.h>
  30
  31 #include "stv6110.h"
  32
  33 static int debug;
  34
  35 struct stv6110_priv {
  36         int i2c_address;
  37         struct i2c_adapter *i2c;
  38
  39         u32 mclk;
  40         u8 clk_div;
  41         u8 gain;
  42         u8 regs[8];
  43 };
  44
  45 #define dprintk(args...) \
  46         do { \
  47                 if (debug) \
  48                         printk(KERN_DEBUG args); \
  49         } while (0)
  50
  51 static s32 abssub(s32 a, s32 b)
  52 {
  53         if (a > b)
  54                 return a - b;
  55         else
  56                 return b - a;
  57 };
  58
  59 static int stv6110_release(struct dvb_frontend *fe)
  60 {
  61         kfree(fe->tuner_priv);
  62         fe->tuner_priv = NULL;
  63         return 0;
  64 }
  65
  66 static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[],
  67                                                         int start, int len)
  68 {
  69         struct stv6110_priv *priv = fe->tuner_priv;
  70         int rc;
  71         u8 cmdbuf[len + 1];
  72         struct i2c_msg msg = {
  73                 .addr   = priv->i2c_address,
  74                 .flags  = 0,
  75                 .buf    = cmdbuf,
  76                 .len    = len + 1
  77         };
  78
  79         dprintk("%s\n", __func__);
  80
  81         if (start + len > 8)
  82                 return -EINVAL;
  83
  84         memcpy(&cmdbuf[1], buf, len);
  85         cmdbuf[0] = start;
  86
  87         if (fe->ops.i2c_gate_ctrl)
  88                 fe->ops.i2c_gate_ctrl(fe, 1);
  89
  90         rc = i2c_transfer(priv->i2c, &msg, 1);
  91         if (rc != 1)
  92                 dprintk("%s: i2c error\n", __func__);
  93
  94         if (fe->ops.i2c_gate_ctrl)
  95                 fe->ops.i2c_gate_ctrl(fe, 0);
  96
  97         return 0;
  98 }
  99
 100 static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[],
 101                                                         int start, int len)
 102 {
 103         struct stv6110_priv *priv = fe->tuner_priv;
 104         int rc;
 105         u8 reg[] = { start };
 106         struct i2c_msg msg[] = {
 107                 {
 108                         .addr   = priv->i2c_address,
 109                         .flags  = 0,
 110                         .buf    = reg,
 111                         .len    = 1,
 112                 }, {
 113                         .addr   = priv->i2c_address,
 114                         .flags  = I2C_M_RD,
 115                         .buf    = regs,
 116                         .len    = len,
 117                 },
 118         };
 119
 120         if (fe->ops.i2c_gate_ctrl)
 121                 fe->ops.i2c_gate_ctrl(fe, 1);
 122
 123         rc = i2c_transfer(priv->i2c, msg, 2);
 124         if (rc != 2)
 125                 dprintk("%s: i2c error\n", __func__);
 126
 127         if (fe->ops.i2c_gate_ctrl)
 128                 fe->ops.i2c_gate_ctrl(fe, 0);
 129
 130         memcpy(&priv->regs[start], regs, len);
 131
 132         return 0;
 133 }
 134
 135 static int stv6110_read_reg(struct dvb_frontend *fe, int start)
 136 {
 137         u8 buf[] = { 0 };
 138         stv6110_read_regs(fe, buf, start, 1);
 139
 140         return buf[0];
 141 }
 142
 143 static int stv6110_sleep(struct dvb_frontend *fe)
 144 {
 145         u8 reg[] = { 0 };
 146         stv6110_write_regs(fe, reg, 0, 1);
 147
 148         return 0;
 149 }
 150
 151 static u32 carrier_width(u32 symbol_rate, fe_rolloff_t rolloff)
 152 {
 153         u32 rlf;
 154
 155         switch (rolloff) {
 156         case ROLLOFF_20:
 157                 rlf = 20;
 158                 break;
 159         case ROLLOFF_25:
 160                 rlf = 25;
 161                 break;
 162         default:
 163                 rlf = 35;
 164                 break;
 165         }
 166
 167         return symbol_rate  + ((symbol_rate * rlf) / 100);
 168 }
 169
 170 static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 171 {
 172         struct stv6110_priv *priv = fe->tuner_priv;
 173         u8 r8, ret = 0x04;
 174         int i;
 175
 176         if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/
 177                 r8 = 31;
 178         else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */
 179                 r8 = 0;
 180         else /*if 5 < BW/2 < 36*/
 181                 r8 = (bandwidth / 2) / 1000000 - 5;
 182
 183         /* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */
 184         /* ctrl3, CF = r8 Set the LPF value */
 185         priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f);
 186         priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f);
 187         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
 188         /* stat1, CALRCSTRT = 1 Start LPF auto calibration*/
 189         priv->regs[RSTV6110_STAT1] |= 0x02;
 190         stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1);
 191
 192         i = 0;
 193         /* Wait for CALRCSTRT == 0 */
 194         while ((i < 10) && (ret != 0)) {
 195                 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02);
 196                 mdelay(1);      /* wait for LPF auto calibration */
 197                 i++;
 198         }
 199
 200         /* RCCLKOFF = 1 calibration done, desactivate the calibration Clock */
 201         priv->regs[RSTV6110_CTRL3] |= (1 << 6);
 202         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
 203         return 0;
 204 }
 205
 206 static int stv6110_init(struct dvb_frontend *fe)
 207 {
 208         struct stv6110_priv *priv = fe->tuner_priv;
 209         u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
 210
 211         memcpy(priv->regs, buf0, 8);
 212         /* K = (Reference / 1000000) - 16 */
 213         priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
 214         priv->regs[RSTV6110_CTRL1] |=
 215                                 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
 216
 217         /* divisor value for the output clock */
 218         priv->regs[RSTV6110_CTRL2] &= ~0xc0;
 219         priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6);
 220
 221         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8);
 222         msleep(1);
 223         stv6110_set_bandwidth(fe, 72000000);
 224
 225         return 0;
 226 }
 227
 228 static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 229 {
 230         struct stv6110_priv *priv = fe->tuner_priv;
 231         u32 nbsteps, divider, psd2, freq;
 232         u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 233
 234         stv6110_read_regs(fe, regs, 0, 8);
 235         /*N*/
 236         divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8;
 237         divider += priv->regs[RSTV6110_TUNING1];
 238
 239         /*R*/
 240         nbsteps  = (priv->regs[RSTV6110_TUNING2] >> 6) & 3;
 241         /*p*/
 242         psd2  = (priv->regs[RSTV6110_TUNING2] >> 4) & 1;
 243
 244         freq = divider * (priv->mclk / 1000);
 245         freq /= (1 << (nbsteps + psd2));
 246         freq /= 4;
 247
 248         *frequency = freq;
 249
 250         return 0;
 251 }
 252
 253 static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
 254 {
 255         struct stv6110_priv *priv = fe->tuner_priv;
 256         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 257         u8 ret = 0x04;
 258         u32 divider, ref, p, presc, i, result_freq, vco_freq;
 259         s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val;
 260         s32 srate;
 261
 262         dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__,
 263                                                 frequency, priv->mclk);
 264
 265         /* K = (Reference / 1000000) - 16 */
 266         priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
 267         priv->regs[RSTV6110_CTRL1] |=
 268                                 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
 269
 270         /* BB_GAIN = db/2 */
 271         if (fe->ops.set_property && fe->ops.get_property) {
 272                 srate = c->symbol_rate;
 273                 dprintk("%s: Get Frontend parameters: srate=%d\n",
 274                                                         __func__, srate);
 275         } else
 276                 srate = 15000000;
 277
 278         priv->regs[RSTV6110_CTRL2] &= ~0x0f;
 279         priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);
 280
 281         if (frequency <= 1023000) {
 282                 p = 1;
 283                 presc = 0;
 284         } else if (frequency <= 1300000) {
 285                 p = 1;
 286                 presc = 1;
 287         } else if (frequency <= 2046000) {
 288                 p = 0;
 289                 presc = 0;
 290         } else {
 291                 p = 0;
 292                 presc = 1;
 293         }
 294         /* DIV4SEL = p*/
 295         priv->regs[RSTV6110_TUNING2] &= ~(1 << 4);
 296         priv->regs[RSTV6110_TUNING2] |= (p << 4);
 297
 298         /* PRESC32ON = presc */
 299         priv->regs[RSTV6110_TUNING2] &= ~(1 << 5);
 300         priv->regs[RSTV6110_TUNING2] |= (presc << 5);
 301
 302         p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */
 303         for (r_div = 0; r_div <= 3; r_div++) {
 304                 p_calc = (priv->mclk / 100000);
 305                 p_calc /= (1 << (r_div + 1));
 306                 if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val)))
 307                         r_div_opt = r_div;
 308
 309                 p_calc_opt = (priv->mclk / 100000);
 310                 p_calc_opt /= (1 << (r_div_opt + 1));
 311         }
 312
 313         ref = priv->mclk / ((1 << (r_div_opt + 1))  * (1 << (p + 1)));
 314         divider = (((frequency * 1000) + (ref >> 1)) / ref);
 315
 316         /* RDIV = r_div_opt */
 317         priv->regs[RSTV6110_TUNING2] &= ~(3 << 6);
 318         priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6);
 319
 320         /* NDIV_MSB = MSB(divider) */
 321         priv->regs[RSTV6110_TUNING2] &= ~0x0f;
 322         priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f);
 323
 324         /* NDIV_LSB, LSB(divider) */
 325         priv->regs[RSTV6110_TUNING1] = (divider & 0xff);
 326
 327         /* CALVCOSTRT = 1 VCO Auto Calibration */
 328         priv->regs[RSTV6110_STAT1] |= 0x04;
 329         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1],
 330                                                 RSTV6110_CTRL1, 8);
 331
 332         i = 0;
 333         /* Wait for CALVCOSTRT == 0 */
 334         while ((i < 10) && (ret != 0)) {
 335                 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04);
 336                 msleep(1); /* wait for VCO auto calibration */
 337                 i++;
 338         }
 339
 340         ret = stv6110_read_reg(fe, RSTV6110_STAT1);
 341         stv6110_get_frequency(fe, &result_freq);
 342
 343         vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1))));
 344         dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__,
 345                                                 ret, result_freq, vco_freq);
 346
 347         return 0;
 348 }
 349
 350 static int stv6110_set_params(struct dvb_frontend *fe,
 351                               struct dvb_frontend_parameters *params)
 352 {
 353         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 354         u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff);
 355
 356         stv6110_set_frequency(fe, c->frequency);
 357         stv6110_set_bandwidth(fe, bandwidth);
 358
 359         return 0;
 360 }
 361
 362 static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 363 {
 364         struct stv6110_priv *priv = fe->tuner_priv;
 365         u8 r8 = 0;
 366         u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 367         stv6110_read_regs(fe, regs, 0, 8);
 368
 369         /* CF */
 370         r8 = priv->regs[RSTV6110_CTRL3] & 0x1f;
 371         *bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */
 372
 373         return 0;
 374 }
 375
 376 static struct dvb_tuner_ops stv6110_tuner_ops = {
 377         .info = {
 378                 .name = "ST STV6110",
 379                 .frequency_min = 950000,
 380                 .frequency_max = 2150000,
 381                 .frequency_step = 1000,
 382         },
 383         .init = stv6110_init,
 384         .release = stv6110_release,
 385         .sleep = stv6110_sleep,
 386         .set_params = stv6110_set_params,
 387         .get_frequency = stv6110_get_frequency,
 388         .set_frequency = stv6110_set_frequency,
 389         .get_bandwidth = stv6110_get_bandwidth,
 390         .set_bandwidth = stv6110_set_bandwidth,
 391
 392 };
 393
 394 struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe,
 395                                         const struct stv6110_config *config,
 396                                         struct i2c_adapter *i2c)
 397 {
 398         struct stv6110_priv *priv = NULL;
 399         u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
 400
 401         struct i2c_msg msg[] = {
 402                 {
 403                         .addr = config->i2c_address,
 404                         .flags = 0,
 405                         .buf = reg0,
 406                         .len = 9
 407                 }
 408         };
 409         int ret;
 410
 411         /* divisor value for the output clock */
 412         reg0[2] &= ~0xc0;
 413         reg0[2] |= (config->clk_div << 6);
 414
 415         if (fe->ops.i2c_gate_ctrl)
 416                 fe->ops.i2c_gate_ctrl(fe, 1);
 417
 418         ret = i2c_transfer(i2c, msg, 1);
 419
 420         if (fe->ops.i2c_gate_ctrl)
 421                 fe->ops.i2c_gate_ctrl(fe, 0);
 422
 423         if (ret != 1)
 424                 return NULL;
 425
 426         priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL);
 427         if (priv == NULL)
 428                 return NULL;
 429
 430         priv->i2c_address = config->i2c_address;
 431         priv->i2c = i2c;
 432         priv->mclk = config->mclk;
 433         priv->clk_div = config->clk_div;
 434         priv->gain = config->gain;
 435
 436         memcpy(&priv->regs, &reg0[1], 8);
 437
 438         memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops,
 439                                 sizeof(struct dvb_tuner_ops));
 440         fe->tuner_priv = priv;
 441         printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address);
 442
 443         return fe;
 444 }
 445 EXPORT_SYMBOL(stv6110_attach);
 446
 447 module_param(debug, int, 0644);
 448 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 449
 450 MODULE_DESCRIPTION("ST STV6110 driver");
 451 MODULE_AUTHOR("Igor M. Liplianin");
 452 MODULE_LICENSE("GPL");