drivers/media/dvb/frontends/stv6110.c

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