LXR linux/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/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
  33static int debug;
  34
  35struct 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
  51static s32 abssub(s32 a, s32 b)
  52{
  53        if (a > b)
  54                return a - b;
  55        else
  56                return b - a;
  57};
  58
  59static int stv6110_release(struct dvb_frontend *fe)
  60{
  61        kfree(fe->tuner_priv);
  62        fe->tuner_priv = NULL;
  63        return 0;
  64}
  65
  66static 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
 100static 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
 135static 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
 143static 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
 151static 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
 170static 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
 206static 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
 228static 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
 253static 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
 350static int stv6110_set_params(struct dvb_frontend *fe)
 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
 361static 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
 375static 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
 393struct 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}
 444EXPORT_SYMBOL(stv6110_attach);
 445
 446module_param(debug, int, 0644);
 447MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 448
 449MODULE_DESCRIPTION("ST STV6110 driver");
 450MODULE_AUTHOR("Igor M. Liplianin");
 451MODULE_LICENSE("GPL");
 452