linux/drivers/media/common/tuners/mt2060.c
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   1/*
   2 *  Driver for Microtune MT2060 "Single chip dual conversion broadband tuner"
   3 *
   4 *  Copyright (c) 2006 Olivier DANET <odanet@caramail.com>
   5 *
   6 *  This program is free software; you can redistribute it and/or modify
   7 *  it under the terms of the GNU General Public License as published by
   8 *  the Free Software Foundation; either version 2 of the License, or
   9 *  (at your option) any later version.
  10 *
  11 *  This program is distributed in the hope that it will be useful,
  12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 *
  15 *  GNU General Public License for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License
  18 *  along with this program; if not, write to the Free Software
  19 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
  20 */
  21
  22/* In that file, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
  23
  24#include <linux/module.h>
  25#include <linux/delay.h>
  26#include <linux/dvb/frontend.h>
  27#include <linux/i2c.h>
  28#include <linux/slab.h>
  29
  30#include "dvb_frontend.h"
  31
  32#include "mt2060.h"
  33#include "mt2060_priv.h"
  34
  35static int debug;
  36module_param(debug, int, 0644);
  37MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  38
  39#define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2060: " args); printk("\n"); }} while (0)
  40
  41// Reads a single register
  42static int mt2060_readreg(struct mt2060_priv *priv, u8 reg, u8 *val)
  43{
  44        struct i2c_msg msg[2] = {
  45                { .addr = priv->cfg->i2c_address, .flags = 0,        .buf = &reg, .len = 1 },
  46                { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val,  .len = 1 },
  47        };
  48
  49        if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  50                printk(KERN_WARNING "mt2060 I2C read failed\n");
  51                return -EREMOTEIO;
  52        }
  53        return 0;
  54}
  55
  56// Writes a single register
  57static int mt2060_writereg(struct mt2060_priv *priv, u8 reg, u8 val)
  58{
  59        u8 buf[2] = { reg, val };
  60        struct i2c_msg msg = {
  61                .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
  62        };
  63
  64        if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  65                printk(KERN_WARNING "mt2060 I2C write failed\n");
  66                return -EREMOTEIO;
  67        }
  68        return 0;
  69}
  70
  71// Writes a set of consecutive registers
  72static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len)
  73{
  74        struct i2c_msg msg = {
  75                .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len
  76        };
  77        if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  78                printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n",(int)len);
  79                return -EREMOTEIO;
  80        }
  81        return 0;
  82}
  83
  84// Initialisation sequences
  85// LNABAND=3, NUM1=0x3C, DIV1=0x74, NUM2=0x1080, DIV2=0x49
  86static u8 mt2060_config1[] = {
  87        REG_LO1C1,
  88        0x3F,   0x74,   0x00,   0x08,   0x93
  89};
  90
  91// FMCG=2, GP2=0, GP1=0
  92static u8 mt2060_config2[] = {
  93        REG_MISC_CTRL,
  94        0x20,   0x1E,   0x30,   0xff,   0x80,   0xff,   0x00,   0x2c,   0x42
  95};
  96
  97//  VGAG=3, V1CSE=1
  98
  99#ifdef  MT2060_SPURCHECK
 100/* The function below calculates the frequency offset between the output frequency if2
 101 and the closer cross modulation subcarrier between lo1 and lo2 up to the tenth harmonic */
 102static int mt2060_spurcalc(u32 lo1,u32 lo2,u32 if2)
 103{
 104        int I,J;
 105        int dia,diamin,diff;
 106        diamin=1000000;
 107        for (I = 1; I < 10; I++) {
 108                J = ((2*I*lo1)/lo2+1)/2;
 109                diff = I*(int)lo1-J*(int)lo2;
 110                if (diff < 0) diff=-diff;
 111                dia = (diff-(int)if2);
 112                if (dia < 0) dia=-dia;
 113                if (diamin > dia) diamin=dia;
 114        }
 115        return diamin;
 116}
 117
 118#define BANDWIDTH 4000 // kHz
 119
 120/* Calculates the frequency offset to add to avoid spurs. Returns 0 if no offset is needed */
 121static int mt2060_spurcheck(u32 lo1,u32 lo2,u32 if2)
 122{
 123        u32 Spur,Sp1,Sp2;
 124        int I,J;
 125        I=0;
 126        J=1000;
 127
 128        Spur=mt2060_spurcalc(lo1,lo2,if2);
 129        if (Spur < BANDWIDTH) {
 130                /* Potential spurs detected */
 131                dprintk("Spurs before : f_lo1: %d  f_lo2: %d  (kHz)",
 132                        (int)lo1,(int)lo2);
 133                I=1000;
 134                Sp1 = mt2060_spurcalc(lo1+I,lo2+I,if2);
 135                Sp2 = mt2060_spurcalc(lo1-I,lo2-I,if2);
 136
 137                if (Sp1 < Sp2) {
 138                        J=-J; I=-I; Spur=Sp2;
 139                } else
 140                        Spur=Sp1;
 141
 142                while (Spur < BANDWIDTH) {
 143                        I += J;
 144                        Spur = mt2060_spurcalc(lo1+I,lo2+I,if2);
 145                }
 146                dprintk("Spurs after  : f_lo1: %d  f_lo2: %d  (kHz)",
 147                        (int)(lo1+I),(int)(lo2+I));
 148        }
 149        return I;
 150}
 151#endif
 152
 153#define IF2  36150       // IF2 frequency = 36.150 MHz
 154#define FREF 16000       // Quartz oscillator 16 MHz
 155
 156static int mt2060_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params)
 157{
 158        struct mt2060_priv *priv;
 159        int ret=0;
 160        int i=0;
 161        u32 freq;
 162        u8  lnaband;
 163        u32 f_lo1,f_lo2;
 164        u32 div1,num1,div2,num2;
 165        u8  b[8];
 166        u32 if1;
 167
 168        priv = fe->tuner_priv;
 169
 170        if1 = priv->if1_freq;
 171        b[0] = REG_LO1B1;
 172        b[1] = 0xFF;
 173
 174        if (fe->ops.i2c_gate_ctrl)
 175                fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 176
 177        mt2060_writeregs(priv,b,2);
 178
 179        freq = params->frequency / 1000; // Hz -> kHz
 180        priv->bandwidth = (fe->ops.info.type == FE_OFDM) ? params->u.ofdm.bandwidth : 0;
 181
 182        f_lo1 = freq + if1 * 1000;
 183        f_lo1 = (f_lo1 / 250) * 250;
 184        f_lo2 = f_lo1 - freq - IF2;
 185        // From the Comtech datasheet, the step used is 50kHz. The tuner chip could be more precise
 186        f_lo2 = ((f_lo2 + 25) / 50) * 50;
 187        priv->frequency =  (f_lo1 - f_lo2 - IF2) * 1000,
 188
 189#ifdef MT2060_SPURCHECK
 190        // LO-related spurs detection and correction
 191        num1   = mt2060_spurcheck(f_lo1,f_lo2,IF2);
 192        f_lo1 += num1;
 193        f_lo2 += num1;
 194#endif
 195        //Frequency LO1 = 16MHz * (DIV1 + NUM1/64 )
 196        num1 = f_lo1 / (FREF / 64);
 197        div1 = num1 / 64;
 198        num1 &= 0x3f;
 199
 200        // Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 )
 201        num2 = f_lo2 * 64 / (FREF / 128);
 202        div2 = num2 / 8192;
 203        num2 &= 0x1fff;
 204
 205        if (freq <=  95000) lnaband = 0xB0; else
 206        if (freq <= 180000) lnaband = 0xA0; else
 207        if (freq <= 260000) lnaband = 0x90; else
 208        if (freq <= 335000) lnaband = 0x80; else
 209        if (freq <= 425000) lnaband = 0x70; else
 210        if (freq <= 480000) lnaband = 0x60; else
 211        if (freq <= 570000) lnaband = 0x50; else
 212        if (freq <= 645000) lnaband = 0x40; else
 213        if (freq <= 730000) lnaband = 0x30; else
 214        if (freq <= 810000) lnaband = 0x20; else lnaband = 0x10;
 215
 216        b[0] = REG_LO1C1;
 217        b[1] = lnaband | ((num1 >>2) & 0x0F);
 218        b[2] = div1;
 219        b[3] = (num2 & 0x0F)  | ((num1 & 3) << 4);
 220        b[4] = num2 >> 4;
 221        b[5] = ((num2 >>12) & 1) | (div2 << 1);
 222
 223        dprintk("IF1: %dMHz",(int)if1);
 224        dprintk("PLL freq=%dkHz  f_lo1=%dkHz  f_lo2=%dkHz",(int)freq,(int)f_lo1,(int)f_lo2);
 225        dprintk("PLL div1=%d  num1=%d  div2=%d  num2=%d",(int)div1,(int)num1,(int)div2,(int)num2);
 226        dprintk("PLL [1..5]: %2x %2x %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3],(int)b[4],(int)b[5]);
 227
 228        mt2060_writeregs(priv,b,6);
 229
 230        //Waits for pll lock or timeout
 231        i = 0;
 232        do {
 233                mt2060_readreg(priv,REG_LO_STATUS,b);
 234                if ((b[0] & 0x88)==0x88)
 235                        break;
 236                msleep(4);
 237                i++;
 238        } while (i<10);
 239
 240        if (fe->ops.i2c_gate_ctrl)
 241                fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 242
 243        return ret;
 244}
 245
 246static void mt2060_calibrate(struct mt2060_priv *priv)
 247{
 248        u8 b = 0;
 249        int i = 0;
 250
 251        if (mt2060_writeregs(priv,mt2060_config1,sizeof(mt2060_config1)))
 252                return;
 253        if (mt2060_writeregs(priv,mt2060_config2,sizeof(mt2060_config2)))
 254                return;
 255
 256        /* initialize the clock output */
 257        mt2060_writereg(priv, REG_VGAG, (priv->cfg->clock_out << 6) | 0x30);
 258
 259        do {
 260                b |= (1 << 6); // FM1SS;
 261                mt2060_writereg(priv, REG_LO2C1,b);
 262                msleep(20);
 263
 264                if (i == 0) {
 265                        b |= (1 << 7); // FM1CA;
 266                        mt2060_writereg(priv, REG_LO2C1,b);
 267                        b &= ~(1 << 7); // FM1CA;
 268                        msleep(20);
 269                }
 270
 271                b &= ~(1 << 6); // FM1SS
 272                mt2060_writereg(priv, REG_LO2C1,b);
 273
 274                msleep(20);
 275                i++;
 276        } while (i < 9);
 277
 278        i = 0;
 279        while (i++ < 10 && mt2060_readreg(priv, REG_MISC_STAT, &b) == 0 && (b & (1 << 6)) == 0)
 280                msleep(20);
 281
 282        if (i <= 10) {
 283                mt2060_readreg(priv, REG_FM_FREQ, &priv->fmfreq); // now find out, what is fmreq used for :)
 284                dprintk("calibration was successful: %d", (int)priv->fmfreq);
 285        } else
 286                dprintk("FMCAL timed out");
 287}
 288
 289static int mt2060_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 290{
 291        struct mt2060_priv *priv = fe->tuner_priv;
 292        *frequency = priv->frequency;
 293        return 0;
 294}
 295
 296static int mt2060_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 297{
 298        struct mt2060_priv *priv = fe->tuner_priv;
 299        *bandwidth = priv->bandwidth;
 300        return 0;
 301}
 302
 303static int mt2060_init(struct dvb_frontend *fe)
 304{
 305        struct mt2060_priv *priv = fe->tuner_priv;
 306        int ret;
 307
 308        if (fe->ops.i2c_gate_ctrl)
 309                fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 310
 311        ret = mt2060_writereg(priv, REG_VGAG,
 312                              (priv->cfg->clock_out << 6) | 0x33);
 313
 314        if (fe->ops.i2c_gate_ctrl)
 315                fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 316
 317        return ret;
 318}
 319
 320static int mt2060_sleep(struct dvb_frontend *fe)
 321{
 322        struct mt2060_priv *priv = fe->tuner_priv;
 323        int ret;
 324
 325        if (fe->ops.i2c_gate_ctrl)
 326                fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 327
 328        ret = mt2060_writereg(priv, REG_VGAG,
 329                              (priv->cfg->clock_out << 6) | 0x30);
 330
 331        if (fe->ops.i2c_gate_ctrl)
 332                fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 333
 334        return ret;
 335}
 336
 337static int mt2060_release(struct dvb_frontend *fe)
 338{
 339        kfree(fe->tuner_priv);
 340        fe->tuner_priv = NULL;
 341        return 0;
 342}
 343
 344static const struct dvb_tuner_ops mt2060_tuner_ops = {
 345        .info = {
 346                .name           = "Microtune MT2060",
 347                .frequency_min  =  48000000,
 348                .frequency_max  = 860000000,
 349                .frequency_step =     50000,
 350        },
 351
 352        .release       = mt2060_release,
 353
 354        .init          = mt2060_init,
 355        .sleep         = mt2060_sleep,
 356
 357        .set_params    = mt2060_set_params,
 358        .get_frequency = mt2060_get_frequency,
 359        .get_bandwidth = mt2060_get_bandwidth
 360};
 361
 362/* This functions tries to identify a MT2060 tuner by reading the PART/REV register. This is hasty. */
 363struct dvb_frontend * mt2060_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2060_config *cfg, u16 if1)
 364{
 365        struct mt2060_priv *priv = NULL;
 366        u8 id = 0;
 367
 368        priv = kzalloc(sizeof(struct mt2060_priv), GFP_KERNEL);
 369        if (priv == NULL)
 370                return NULL;
 371
 372        priv->cfg      = cfg;
 373        priv->i2c      = i2c;
 374        priv->if1_freq = if1;
 375
 376        if (fe->ops.i2c_gate_ctrl)
 377                fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 378
 379        if (mt2060_readreg(priv,REG_PART_REV,&id) != 0) {
 380                kfree(priv);
 381                return NULL;
 382        }
 383
 384        if (id != PART_REV) {
 385                kfree(priv);
 386                return NULL;
 387        }
 388        printk(KERN_INFO "MT2060: successfully identified (IF1 = %d)\n", if1);
 389        memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(struct dvb_tuner_ops));
 390
 391        fe->tuner_priv = priv;
 392
 393        mt2060_calibrate(priv);
 394
 395        if (fe->ops.i2c_gate_ctrl)
 396                fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 397
 398        return fe;
 399}
 400EXPORT_SYMBOL(mt2060_attach);
 401
 402MODULE_AUTHOR("Olivier DANET");
 403MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver");
 404MODULE_LICENSE("GPL");
 405