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
  21 #include <linux/slab.h>
  22 #include <linux/module.h>
  23 #include <linux/dvb/frontend.h>
  24
  25 #include <linux/types.h>
  26
  27 #include "stv6110.h"
  28
  29 /* Max transfer size done by I2C transfer functions */
  30 #define MAX_XFER_SIZE  64
  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 void stv6110_release(struct dvb_frontend *fe)
  59 {
  60         kfree(fe->tuner_priv);
  61         fe->tuner_priv = NULL;
  62 }
  63
  64 static int stv6110_write_regs(struct dvb_frontend *fe, u8 buf[],
  65                                                         int start, int len)
  66 {
  67         struct stv6110_priv *priv = fe->tuner_priv;
  68         int rc;
  69         u8 cmdbuf[MAX_XFER_SIZE];
  70         struct i2c_msg msg = {
  71                 .addr   = priv->i2c_address,
  72                 .flags  = 0,
  73                 .buf    = cmdbuf,
  74                 .len    = len + 1
  75         };
  76
  77         dprintk("%s\n", __func__);
  78
  79         if (1 + len > sizeof(cmdbuf)) {
  80                 printk(KERN_WARNING
  81                        "%s: i2c wr: len=%d is too big!\n",
  82                        KBUILD_MODNAME, len);
  83                 return -EINVAL;
  84         }
  85
  86         if (start + len > 8)
  87                 return -EINVAL;
  88
  89         memcpy(&cmdbuf[1], buf, len);
  90         cmdbuf[0] = start;
  91
  92         if (fe->ops.i2c_gate_ctrl)
  93                 fe->ops.i2c_gate_ctrl(fe, 1);
  94
  95         rc = i2c_transfer(priv->i2c, &msg, 1);
  96         if (rc != 1)
  97                 dprintk("%s: i2c error\n", __func__);
  98
  99         if (fe->ops.i2c_gate_ctrl)
 100                 fe->ops.i2c_gate_ctrl(fe, 0);
 101
 102         return 0;
 103 }
 104
 105 static int stv6110_read_regs(struct dvb_frontend *fe, u8 regs[],
 106                                                         int start, int len)
 107 {
 108         struct stv6110_priv *priv = fe->tuner_priv;
 109         int rc;
 110         u8 reg[] = { start };
 111         struct i2c_msg msg[] = {
 112                 {
 113                         .addr   = priv->i2c_address,
 114                         .flags  = 0,
 115                         .buf    = reg,
 116                         .len    = 1,
 117                 }, {
 118                         .addr   = priv->i2c_address,
 119                         .flags  = I2C_M_RD,
 120                         .buf    = regs,
 121                         .len    = len,
 122                 },
 123         };
 124
 125         if (fe->ops.i2c_gate_ctrl)
 126                 fe->ops.i2c_gate_ctrl(fe, 1);
 127
 128         rc = i2c_transfer(priv->i2c, msg, 2);
 129         if (rc != 2)
 130                 dprintk("%s: i2c error\n", __func__);
 131
 132         if (fe->ops.i2c_gate_ctrl)
 133                 fe->ops.i2c_gate_ctrl(fe, 0);
 134
 135         memcpy(&priv->regs[start], regs, len);
 136
 137         return 0;
 138 }
 139
 140 static int stv6110_read_reg(struct dvb_frontend *fe, int start)
 141 {
 142         u8 buf[] = { 0 };
 143         stv6110_read_regs(fe, buf, start, 1);
 144
 145         return buf[0];
 146 }
 147
 148 static int stv6110_sleep(struct dvb_frontend *fe)
 149 {
 150         u8 reg[] = { 0 };
 151         stv6110_write_regs(fe, reg, 0, 1);
 152
 153         return 0;
 154 }
 155
 156 static u32 carrier_width(u32 symbol_rate, enum fe_rolloff rolloff)
 157 {
 158         u32 rlf;
 159
 160         switch (rolloff) {
 161         case ROLLOFF_20:
 162                 rlf = 20;
 163                 break;
 164         case ROLLOFF_25:
 165                 rlf = 25;
 166                 break;
 167         default:
 168                 rlf = 35;
 169                 break;
 170         }
 171
 172         return symbol_rate  + ((symbol_rate * rlf) / 100);
 173 }
 174
 175 static int stv6110_set_bandwidth(struct dvb_frontend *fe, u32 bandwidth)
 176 {
 177         struct stv6110_priv *priv = fe->tuner_priv;
 178         u8 r8, ret = 0x04;
 179         int i;
 180
 181         if ((bandwidth / 2) > 36000000) /*BW/2 max=31+5=36 mhz for r8=31*/
 182                 r8 = 31;
 183         else if ((bandwidth / 2) < 5000000) /* BW/2 min=5Mhz for F=0 */
 184                 r8 = 0;
 185         else /*if 5 < BW/2 < 36*/
 186                 r8 = (bandwidth / 2) / 1000000 - 5;
 187
 188         /* ctrl3, RCCLKOFF = 0 Activate the calibration Clock */
 189         /* ctrl3, CF = r8 Set the LPF value */
 190         priv->regs[RSTV6110_CTRL3] &= ~((1 << 6) | 0x1f);
 191         priv->regs[RSTV6110_CTRL3] |= (r8 & 0x1f);
 192         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
 193         /* stat1, CALRCSTRT = 1 Start LPF auto calibration*/
 194         priv->regs[RSTV6110_STAT1] |= 0x02;
 195         stv6110_write_regs(fe, &priv->regs[RSTV6110_STAT1], RSTV6110_STAT1, 1);
 196
 197         i = 0;
 198         /* Wait for CALRCSTRT == 0 */
 199         while ((i < 10) && (ret != 0)) {
 200                 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x02);
 201                 mdelay(1);      /* wait for LPF auto calibration */
 202                 i++;
 203         }
 204
 205         /* RCCLKOFF = 1 calibration done, desactivate the calibration Clock */
 206         priv->regs[RSTV6110_CTRL3] |= (1 << 6);
 207         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL3], RSTV6110_CTRL3, 1);
 208         return 0;
 209 }
 210
 211 static int stv6110_init(struct dvb_frontend *fe)
 212 {
 213         struct stv6110_priv *priv = fe->tuner_priv;
 214         u8 buf0[] = { 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
 215
 216         memcpy(priv->regs, buf0, 8);
 217         /* K = (Reference / 1000000) - 16 */
 218         priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
 219         priv->regs[RSTV6110_CTRL1] |=
 220                                 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
 221
 222         /* divisor value for the output clock */
 223         priv->regs[RSTV6110_CTRL2] &= ~0xc0;
 224         priv->regs[RSTV6110_CTRL2] |= (priv->clk_div << 6);
 225
 226         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1], RSTV6110_CTRL1, 8);
 227         msleep(1);
 228         stv6110_set_bandwidth(fe, 72000000);
 229
 230         return 0;
 231 }
 232
 233 static int stv6110_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 234 {
 235         struct stv6110_priv *priv = fe->tuner_priv;
 236         u32 nbsteps, divider, psd2, freq;
 237         u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 238
 239         stv6110_read_regs(fe, regs, 0, 8);
 240         /*N*/
 241         divider = (priv->regs[RSTV6110_TUNING2] & 0x0f) << 8;
 242         divider += priv->regs[RSTV6110_TUNING1];
 243
 244         /*R*/
 245         nbsteps  = (priv->regs[RSTV6110_TUNING2] >> 6) & 3;
 246         /*p*/
 247         psd2  = (priv->regs[RSTV6110_TUNING2] >> 4) & 1;
 248
 249         freq = divider * (priv->mclk / 1000);
 250         freq /= (1 << (nbsteps + psd2));
 251         freq /= 4;
 252
 253         *frequency = freq;
 254
 255         return 0;
 256 }
 257
 258 static int stv6110_set_frequency(struct dvb_frontend *fe, u32 frequency)
 259 {
 260         struct stv6110_priv *priv = fe->tuner_priv;
 261         u8 ret = 0x04;
 262         u32 divider, ref, p, presc, i, result_freq, vco_freq;
 263         s32 p_calc, p_calc_opt = 1000, r_div, r_div_opt = 0, p_val;
 264
 265         dprintk("%s, freq=%d kHz, mclk=%d Hz\n", __func__,
 266                                                 frequency, priv->mclk);
 267
 268         /* K = (Reference / 1000000) - 16 */
 269         priv->regs[RSTV6110_CTRL1] &= ~(0x1f << 3);
 270         priv->regs[RSTV6110_CTRL1] |=
 271                                 ((((priv->mclk / 1000000) - 16) & 0x1f) << 3);
 272
 273         /* BB_GAIN = db/2 */
 274         priv->regs[RSTV6110_CTRL2] &= ~0x0f;
 275         priv->regs[RSTV6110_CTRL2] |= (priv->gain & 0x0f);
 276
 277         if (frequency <= 1023000) {
 278                 p = 1;
 279                 presc = 0;
 280         } else if (frequency <= 1300000) {
 281                 p = 1;
 282                 presc = 1;
 283         } else if (frequency <= 2046000) {
 284                 p = 0;
 285                 presc = 0;
 286         } else {
 287                 p = 0;
 288                 presc = 1;
 289         }
 290         /* DIV4SEL = p*/
 291         priv->regs[RSTV6110_TUNING2] &= ~(1 << 4);
 292         priv->regs[RSTV6110_TUNING2] |= (p << 4);
 293
 294         /* PRESC32ON = presc */
 295         priv->regs[RSTV6110_TUNING2] &= ~(1 << 5);
 296         priv->regs[RSTV6110_TUNING2] |= (presc << 5);
 297
 298         p_val = (int)(1 << (p + 1)) * 10;/* P = 2 or P = 4 */
 299         for (r_div = 0; r_div <= 3; r_div++) {
 300                 p_calc = (priv->mclk / 100000);
 301                 p_calc /= (1 << (r_div + 1));
 302                 if ((abssub(p_calc, p_val)) < (abssub(p_calc_opt, p_val)))
 303                         r_div_opt = r_div;
 304
 305                 p_calc_opt = (priv->mclk / 100000);
 306                 p_calc_opt /= (1 << (r_div_opt + 1));
 307         }
 308
 309         ref = priv->mclk / ((1 << (r_div_opt + 1))  * (1 << (p + 1)));
 310         divider = (((frequency * 1000) + (ref >> 1)) / ref);
 311
 312         /* RDIV = r_div_opt */
 313         priv->regs[RSTV6110_TUNING2] &= ~(3 << 6);
 314         priv->regs[RSTV6110_TUNING2] |= (((r_div_opt) & 3) << 6);
 315
 316         /* NDIV_MSB = MSB(divider) */
 317         priv->regs[RSTV6110_TUNING2] &= ~0x0f;
 318         priv->regs[RSTV6110_TUNING2] |= (((divider) >> 8) & 0x0f);
 319
 320         /* NDIV_LSB, LSB(divider) */
 321         priv->regs[RSTV6110_TUNING1] = (divider & 0xff);
 322
 323         /* CALVCOSTRT = 1 VCO Auto Calibration */
 324         priv->regs[RSTV6110_STAT1] |= 0x04;
 325         stv6110_write_regs(fe, &priv->regs[RSTV6110_CTRL1],
 326                                                 RSTV6110_CTRL1, 8);
 327
 328         i = 0;
 329         /* Wait for CALVCOSTRT == 0 */
 330         while ((i < 10) && (ret != 0)) {
 331                 ret = ((stv6110_read_reg(fe, RSTV6110_STAT1)) & 0x04);
 332                 msleep(1); /* wait for VCO auto calibration */
 333                 i++;
 334         }
 335
 336         ret = stv6110_read_reg(fe, RSTV6110_STAT1);
 337         stv6110_get_frequency(fe, &result_freq);
 338
 339         vco_freq = divider * ((priv->mclk / 1000) / ((1 << (r_div_opt + 1))));
 340         dprintk("%s, stat1=%x, lo_freq=%d kHz, vco_frec=%d kHz\n", __func__,
 341                                                 ret, result_freq, vco_freq);
 342
 343         return 0;
 344 }
 345
 346 static int stv6110_set_params(struct dvb_frontend *fe)
 347 {
 348         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 349         u32 bandwidth = carrier_width(c->symbol_rate, c->rolloff);
 350
 351         stv6110_set_frequency(fe, c->frequency);
 352         stv6110_set_bandwidth(fe, bandwidth);
 353
 354         return 0;
 355 }
 356
 357 static int stv6110_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 358 {
 359         struct stv6110_priv *priv = fe->tuner_priv;
 360         u8 r8 = 0;
 361         u8 regs[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 362         stv6110_read_regs(fe, regs, 0, 8);
 363
 364         /* CF */
 365         r8 = priv->regs[RSTV6110_CTRL3] & 0x1f;
 366         *bandwidth = (r8 + 5) * 2000000;/* x2 for ZIF tuner BW/2 = F+5 Mhz */
 367
 368         return 0;
 369 }
 370
 371 static const struct dvb_tuner_ops stv6110_tuner_ops = {
 372         .info = {
 373                 .name = "ST STV6110",
 374                 .frequency_min = 950000,
 375                 .frequency_max = 2150000,
 376                 .frequency_step = 1000,
 377         },
 378         .init = stv6110_init,
 379         .release = stv6110_release,
 380         .sleep = stv6110_sleep,
 381         .set_params = stv6110_set_params,
 382         .get_frequency = stv6110_get_frequency,
 383         .set_frequency = stv6110_set_frequency,
 384         .get_bandwidth = stv6110_get_bandwidth,
 385         .set_bandwidth = stv6110_set_bandwidth,
 386
 387 };
 388
 389 struct dvb_frontend *stv6110_attach(struct dvb_frontend *fe,
 390                                         const struct stv6110_config *config,
 391                                         struct i2c_adapter *i2c)
 392 {
 393         struct stv6110_priv *priv = NULL;
 394         u8 reg0[] = { 0x00, 0x07, 0x11, 0xdc, 0x85, 0x17, 0x01, 0xe6, 0x1e };
 395
 396         struct i2c_msg msg[] = {
 397                 {
 398                         .addr = config->i2c_address,
 399                         .flags = 0,
 400                         .buf = reg0,
 401                         .len = 9
 402                 }
 403         };
 404         int ret;
 405
 406         /* divisor value for the output clock */
 407         reg0[2] &= ~0xc0;
 408         reg0[2] |= (config->clk_div << 6);
 409
 410         if (fe->ops.i2c_gate_ctrl)
 411                 fe->ops.i2c_gate_ctrl(fe, 1);
 412
 413         ret = i2c_transfer(i2c, msg, 1);
 414
 415         if (fe->ops.i2c_gate_ctrl)
 416                 fe->ops.i2c_gate_ctrl(fe, 0);
 417
 418         if (ret != 1)
 419                 return NULL;
 420
 421         priv = kzalloc(sizeof(struct stv6110_priv), GFP_KERNEL);
 422         if (priv == NULL)
 423                 return NULL;
 424
 425         priv->i2c_address = config->i2c_address;
 426         priv->i2c = i2c;
 427         priv->mclk = config->mclk;
 428         priv->clk_div = config->clk_div;
 429         priv->gain = config->gain;
 430
 431         memcpy(&priv->regs, &reg0[1], 8);
 432
 433         memcpy(&fe->ops.tuner_ops, &stv6110_tuner_ops,
 434                                 sizeof(struct dvb_tuner_ops));
 435         fe->tuner_priv = priv;
 436         printk(KERN_INFO "STV6110 attached on addr=%x!\n", priv->i2c_address);
 437
 438         return fe;
 439 }
 440 EXPORT_SYMBOL(stv6110_attach);
 441
 442 module_param(debug, int, 0644);
 443 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 444
 445 MODULE_DESCRIPTION("ST STV6110 driver");
 446 MODULE_AUTHOR("Igor M. Liplianin");
 447 MODULE_LICENSE("GPL");