drivers/media/tuners/mt2060.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Driver for Microtune MT2060 "Single chip dual conversion broadband tuner"
   4  *
   5  *  Copyright (c) 2006 Olivier DANET <odanet@caramail.com>
   6  */
   7
   8 /* In that file, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
   9
  10 #include <linux/module.h>
  11 #include <linux/delay.h>
  12 #include <linux/dvb/frontend.h>
  13 #include <linux/i2c.h>
  14 #include <linux/slab.h>
  15
  16 #include <media/dvb_frontend.h>
  17
  18 #include "mt2060.h"
  19 #include "mt2060_priv.h"
  20
  21 static int debug;
  22 module_param(debug, int, 0644);
  23 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  24
  25 #define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2060: " args); printk("\n"); }} while (0)
  26
  27 // Reads a single register
  28 static int mt2060_readreg(struct mt2060_priv *priv, u8 reg, u8 *val)
  29 {
  30         struct i2c_msg msg[2] = {
  31                 { .addr = priv->cfg->i2c_address, .flags = 0, .len = 1 },
  32                 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .len = 1 },
  33         };
  34         int rc = 0;
  35         u8 *b;
  36
  37         b = kmalloc(2, GFP_KERNEL);
  38         if (!b)
  39                 return -ENOMEM;
  40
  41         b[0] = reg;
  42         b[1] = 0;
  43
  44         msg[0].buf = b;
  45         msg[1].buf = b + 1;
  46
  47         if (i2c_transfer(priv->i2c, msg, 2) != 2) {
  48                 printk(KERN_WARNING "mt2060 I2C read failed\n");
  49                 rc = -EREMOTEIO;
  50         }
  51         *val = b[1];
  52         kfree(b);
  53
  54         return rc;
  55 }
  56
  57 // Writes a single register
  58 static int mt2060_writereg(struct mt2060_priv *priv, u8 reg, u8 val)
  59 {
  60         struct i2c_msg msg = {
  61                 .addr = priv->cfg->i2c_address, .flags = 0, .len = 2
  62         };
  63         u8 *buf;
  64         int rc = 0;
  65
  66         buf = kmalloc(2, GFP_KERNEL);
  67         if (!buf)
  68                 return -ENOMEM;
  69
  70         buf[0] = reg;
  71         buf[1] = val;
  72
  73         msg.buf = buf;
  74
  75         if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
  76                 printk(KERN_WARNING "mt2060 I2C write failed\n");
  77                 rc = -EREMOTEIO;
  78         }
  79         kfree(buf);
  80         return rc;
  81 }
  82
  83 // Writes a set of consecutive registers
  84 static int mt2060_writeregs(struct mt2060_priv *priv,u8 *buf, u8 len)
  85 {
  86         int rem, val_len;
  87         u8 *xfer_buf;
  88         int rc = 0;
  89         struct i2c_msg msg = {
  90                 .addr = priv->cfg->i2c_address, .flags = 0
  91         };
  92
  93         xfer_buf = kmalloc(16, GFP_KERNEL);
  94         if (!xfer_buf)
  95                 return -ENOMEM;
  96
  97         msg.buf = xfer_buf;
  98
  99         for (rem = len - 1; rem > 0; rem -= priv->i2c_max_regs) {
 100                 val_len = min_t(int, rem, priv->i2c_max_regs);
 101                 msg.len = 1 + val_len;
 102                 xfer_buf[0] = buf[0] + len - 1 - rem;
 103                 memcpy(&xfer_buf[1], &buf[1 + len - 1 - rem], val_len);
 104
 105                 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
 106                         printk(KERN_WARNING "mt2060 I2C write failed (len=%i)\n", val_len);
 107                         rc = -EREMOTEIO;
 108                         break;
 109                 }
 110         }
 111
 112         kfree(xfer_buf);
 113         return rc;
 114 }
 115
 116 // Initialisation sequences
 117 // LNABAND=3, NUM1=0x3C, DIV1=0x74, NUM2=0x1080, DIV2=0x49
 118 static u8 mt2060_config1[] = {
 119         REG_LO1C1,
 120         0x3F,   0x74,   0x00,   0x08,   0x93
 121 };
 122
 123 // FMCG=2, GP2=0, GP1=0
 124 static u8 mt2060_config2[] = {
 125         REG_MISC_CTRL,
 126         0x20,   0x1E,   0x30,   0xff,   0x80,   0xff,   0x00,   0x2c,   0x42
 127 };
 128
 129 //  VGAG=3, V1CSE=1
 130
 131 #ifdef  MT2060_SPURCHECK
 132 /* The function below calculates the frequency offset between the output frequency if2
 133  and the closer cross modulation subcarrier between lo1 and lo2 up to the tenth harmonic */
 134 static int mt2060_spurcalc(u32 lo1,u32 lo2,u32 if2)
 135 {
 136         int I,J;
 137         int dia,diamin,diff;
 138         diamin=1000000;
 139         for (I = 1; I < 10; I++) {
 140                 J = ((2*I*lo1)/lo2+1)/2;
 141                 diff = I*(int)lo1-J*(int)lo2;
 142                 if (diff < 0) diff=-diff;
 143                 dia = (diff-(int)if2);
 144                 if (dia < 0) dia=-dia;
 145                 if (diamin > dia) diamin=dia;
 146         }
 147         return diamin;
 148 }
 149
 150 #define BANDWIDTH 4000 // kHz
 151
 152 /* Calculates the frequency offset to add to avoid spurs. Returns 0 if no offset is needed */
 153 static int mt2060_spurcheck(u32 lo1,u32 lo2,u32 if2)
 154 {
 155         u32 Spur,Sp1,Sp2;
 156         int I,J;
 157         I=0;
 158         J=1000;
 159
 160         Spur=mt2060_spurcalc(lo1,lo2,if2);
 161         if (Spur < BANDWIDTH) {
 162                 /* Potential spurs detected */
 163                 dprintk("Spurs before : f_lo1: %d  f_lo2: %d  (kHz)",
 164                         (int)lo1,(int)lo2);
 165                 I=1000;
 166                 Sp1 = mt2060_spurcalc(lo1+I,lo2+I,if2);
 167                 Sp2 = mt2060_spurcalc(lo1-I,lo2-I,if2);
 168
 169                 if (Sp1 < Sp2) {
 170                         J=-J; I=-I; Spur=Sp2;
 171                 } else
 172                         Spur=Sp1;
 173
 174                 while (Spur < BANDWIDTH) {
 175                         I += J;
 176                         Spur = mt2060_spurcalc(lo1+I,lo2+I,if2);
 177                 }
 178                 dprintk("Spurs after  : f_lo1: %d  f_lo2: %d  (kHz)",
 179                         (int)(lo1+I),(int)(lo2+I));
 180         }
 181         return I;
 182 }
 183 #endif
 184
 185 #define IF2  36150       // IF2 frequency = 36.150 MHz
 186 #define FREF 16000       // Quartz oscillator 16 MHz
 187
 188 static int mt2060_set_params(struct dvb_frontend *fe)
 189 {
 190         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 191         struct mt2060_priv *priv;
 192         int i=0;
 193         u32 freq;
 194         u8  lnaband;
 195         u32 f_lo1,f_lo2;
 196         u32 div1,num1,div2,num2;
 197         u8  b[8];
 198         u32 if1;
 199
 200         priv = fe->tuner_priv;
 201
 202         if1 = priv->if1_freq;
 203         b[0] = REG_LO1B1;
 204         b[1] = 0xFF;
 205
 206         if (fe->ops.i2c_gate_ctrl)
 207                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 208
 209         mt2060_writeregs(priv,b,2);
 210
 211         freq = c->frequency / 1000; /* Hz -> kHz */
 212
 213         f_lo1 = freq + if1 * 1000;
 214         f_lo1 = (f_lo1 / 250) * 250;
 215         f_lo2 = f_lo1 - freq - IF2;
 216         // From the Comtech datasheet, the step used is 50kHz. The tuner chip could be more precise
 217         f_lo2 = ((f_lo2 + 25) / 50) * 50;
 218         priv->frequency =  (f_lo1 - f_lo2 - IF2) * 1000;
 219
 220 #ifdef MT2060_SPURCHECK
 221         // LO-related spurs detection and correction
 222         num1   = mt2060_spurcheck(f_lo1,f_lo2,IF2);
 223         f_lo1 += num1;
 224         f_lo2 += num1;
 225 #endif
 226         //Frequency LO1 = 16MHz * (DIV1 + NUM1/64 )
 227         num1 = f_lo1 / (FREF / 64);
 228         div1 = num1 / 64;
 229         num1 &= 0x3f;
 230
 231         // Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 )
 232         num2 = f_lo2 * 64 / (FREF / 128);
 233         div2 = num2 / 8192;
 234         num2 &= 0x1fff;
 235
 236         if (freq <=  95000) lnaband = 0xB0; else
 237         if (freq <= 180000) lnaband = 0xA0; else
 238         if (freq <= 260000) lnaband = 0x90; else
 239         if (freq <= 335000) lnaband = 0x80; else
 240         if (freq <= 425000) lnaband = 0x70; else
 241         if (freq <= 480000) lnaband = 0x60; else
 242         if (freq <= 570000) lnaband = 0x50; else
 243         if (freq <= 645000) lnaband = 0x40; else
 244         if (freq <= 730000) lnaband = 0x30; else
 245         if (freq <= 810000) lnaband = 0x20; else lnaband = 0x10;
 246
 247         b[0] = REG_LO1C1;
 248         b[1] = lnaband | ((num1 >>2) & 0x0F);
 249         b[2] = div1;
 250         b[3] = (num2 & 0x0F)  | ((num1 & 3) << 4);
 251         b[4] = num2 >> 4;
 252         b[5] = ((num2 >>12) & 1) | (div2 << 1);
 253
 254         dprintk("IF1: %dMHz",(int)if1);
 255         dprintk("PLL freq=%dkHz  f_lo1=%dkHz  f_lo2=%dkHz",(int)freq,(int)f_lo1,(int)f_lo2);
 256         dprintk("PLL div1=%d  num1=%d  div2=%d  num2=%d",(int)div1,(int)num1,(int)div2,(int)num2);
 257         dprintk("PLL [1..5]: %2x %2x %2x %2x %2x",(int)b[1],(int)b[2],(int)b[3],(int)b[4],(int)b[5]);
 258
 259         mt2060_writeregs(priv,b,6);
 260
 261         //Waits for pll lock or timeout
 262         i = 0;
 263         do {
 264                 mt2060_readreg(priv,REG_LO_STATUS,b);
 265                 if ((b[0] & 0x88)==0x88)
 266                         break;
 267                 msleep(4);
 268                 i++;
 269         } while (i<10);
 270
 271         if (fe->ops.i2c_gate_ctrl)
 272                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 273
 274         return 0;
 275 }
 276
 277 static void mt2060_calibrate(struct mt2060_priv *priv)
 278 {
 279         u8 b = 0;
 280         int i = 0;
 281
 282         if (mt2060_writeregs(priv,mt2060_config1,sizeof(mt2060_config1)))
 283                 return;
 284         if (mt2060_writeregs(priv,mt2060_config2,sizeof(mt2060_config2)))
 285                 return;
 286
 287         /* initialize the clock output */
 288         mt2060_writereg(priv, REG_VGAG, (priv->cfg->clock_out << 6) | 0x30);
 289
 290         do {
 291                 b |= (1 << 6); // FM1SS;
 292                 mt2060_writereg(priv, REG_LO2C1,b);
 293                 msleep(20);
 294
 295                 if (i == 0) {
 296                         b |= (1 << 7); // FM1CA;
 297                         mt2060_writereg(priv, REG_LO2C1,b);
 298                         b &= ~(1 << 7); // FM1CA;
 299                         msleep(20);
 300                 }
 301
 302                 b &= ~(1 << 6); // FM1SS
 303                 mt2060_writereg(priv, REG_LO2C1,b);
 304
 305                 msleep(20);
 306                 i++;
 307         } while (i < 9);
 308
 309         i = 0;
 310         while (i++ < 10 && mt2060_readreg(priv, REG_MISC_STAT, &b) == 0 && (b & (1 << 6)) == 0)
 311                 msleep(20);
 312
 313         if (i <= 10) {
 314                 mt2060_readreg(priv, REG_FM_FREQ, &priv->fmfreq); // now find out, what is fmreq used for :)
 315                 dprintk("calibration was successful: %d", (int)priv->fmfreq);
 316         } else
 317                 dprintk("FMCAL timed out");
 318 }
 319
 320 static int mt2060_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 321 {
 322         struct mt2060_priv *priv = fe->tuner_priv;
 323         *frequency = priv->frequency;
 324         return 0;
 325 }
 326
 327 static int mt2060_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
 328 {
 329         *frequency = IF2 * 1000;
 330         return 0;
 331 }
 332
 333 static int mt2060_init(struct dvb_frontend *fe)
 334 {
 335         struct mt2060_priv *priv = fe->tuner_priv;
 336         int ret;
 337
 338         if (fe->ops.i2c_gate_ctrl)
 339                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 340
 341         if (priv->sleep) {
 342                 ret = mt2060_writereg(priv, REG_MISC_CTRL, 0x20);
 343                 if (ret)
 344                         goto err_i2c_gate_ctrl;
 345         }
 346
 347         ret = mt2060_writereg(priv, REG_VGAG,
 348                               (priv->cfg->clock_out << 6) | 0x33);
 349
 350 err_i2c_gate_ctrl:
 351         if (fe->ops.i2c_gate_ctrl)
 352                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 353
 354         return ret;
 355 }
 356
 357 static int mt2060_sleep(struct dvb_frontend *fe)
 358 {
 359         struct mt2060_priv *priv = fe->tuner_priv;
 360         int ret;
 361
 362         if (fe->ops.i2c_gate_ctrl)
 363                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 364
 365         ret = mt2060_writereg(priv, REG_VGAG,
 366                               (priv->cfg->clock_out << 6) | 0x30);
 367         if (ret)
 368                 goto err_i2c_gate_ctrl;
 369
 370         if (priv->sleep)
 371                 ret = mt2060_writereg(priv, REG_MISC_CTRL, 0xe8);
 372
 373 err_i2c_gate_ctrl:
 374         if (fe->ops.i2c_gate_ctrl)
 375                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 376
 377         return ret;
 378 }
 379
 380 static void mt2060_release(struct dvb_frontend *fe)
 381 {
 382         kfree(fe->tuner_priv);
 383         fe->tuner_priv = NULL;
 384 }
 385
 386 static const struct dvb_tuner_ops mt2060_tuner_ops = {
 387         .info = {
 388                 .name              = "Microtune MT2060",
 389                 .frequency_min_hz  =  48 * MHz,
 390                 .frequency_max_hz  = 860 * MHz,
 391                 .frequency_step_hz =  50 * kHz,
 392         },
 393
 394         .release       = mt2060_release,
 395
 396         .init          = mt2060_init,
 397         .sleep         = mt2060_sleep,
 398
 399         .set_params    = mt2060_set_params,
 400         .get_frequency = mt2060_get_frequency,
 401         .get_if_frequency = mt2060_get_if_frequency,
 402 };
 403
 404 /* This functions tries to identify a MT2060 tuner by reading the PART/REV register. This is hasty. */
 405 struct dvb_frontend * mt2060_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2060_config *cfg, u16 if1)
 406 {
 407         struct mt2060_priv *priv = NULL;
 408         u8 id = 0;
 409
 410         priv = kzalloc(sizeof(struct mt2060_priv), GFP_KERNEL);
 411         if (priv == NULL)
 412                 return NULL;
 413
 414         priv->cfg      = cfg;
 415         priv->i2c      = i2c;
 416         priv->if1_freq = if1;
 417         priv->i2c_max_regs = ~0;
 418
 419         if (fe->ops.i2c_gate_ctrl)
 420                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 421
 422         if (mt2060_readreg(priv,REG_PART_REV,&id) != 0) {
 423                 kfree(priv);
 424                 return NULL;
 425         }
 426
 427         if (id != PART_REV) {
 428                 kfree(priv);
 429                 return NULL;
 430         }
 431         printk(KERN_INFO "MT2060: successfully identified (IF1 = %d)\n", if1);
 432         memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(struct dvb_tuner_ops));
 433
 434         fe->tuner_priv = priv;
 435
 436         mt2060_calibrate(priv);
 437
 438         if (fe->ops.i2c_gate_ctrl)
 439                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 440
 441         return fe;
 442 }
 443 EXPORT_SYMBOL(mt2060_attach);
 444
 445 static int mt2060_probe(struct i2c_client *client,
 446                         const struct i2c_device_id *id)
 447 {
 448         struct mt2060_platform_data *pdata = client->dev.platform_data;
 449         struct dvb_frontend *fe;
 450         struct mt2060_priv *dev;
 451         int ret;
 452         u8 chip_id;
 453
 454         dev_dbg(&client->dev, "\n");
 455
 456         if (!pdata) {
 457                 dev_err(&client->dev, "Cannot proceed without platform data\n");
 458                 ret = -EINVAL;
 459                 goto err;
 460         }
 461
 462         dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
 463         if (!dev) {
 464                 ret = -ENOMEM;
 465                 goto err;
 466         }
 467
 468         fe = pdata->dvb_frontend;
 469         dev->config.i2c_address = client->addr;
 470         dev->config.clock_out = pdata->clock_out;
 471         dev->cfg = &dev->config;
 472         dev->i2c = client->adapter;
 473         dev->if1_freq = pdata->if1 ? pdata->if1 : 1220;
 474         dev->client = client;
 475         dev->i2c_max_regs = pdata->i2c_write_max ? pdata->i2c_write_max - 1 : ~0;
 476         dev->sleep = true;
 477
 478         ret = mt2060_readreg(dev, REG_PART_REV, &chip_id);
 479         if (ret) {
 480                 ret = -ENODEV;
 481                 goto err;
 482         }
 483
 484         dev_dbg(&client->dev, "chip id=%02x\n", chip_id);
 485
 486         if (chip_id != PART_REV) {
 487                 ret = -ENODEV;
 488                 goto err;
 489         }
 490
 491         /* Power on, calibrate, sleep */
 492         ret = mt2060_writereg(dev, REG_MISC_CTRL, 0x20);
 493         if (ret)
 494                 goto err;
 495         mt2060_calibrate(dev);
 496         ret = mt2060_writereg(dev, REG_MISC_CTRL, 0xe8);
 497         if (ret)
 498                 goto err;
 499
 500         dev_info(&client->dev, "Microtune MT2060 successfully identified\n");
 501         memcpy(&fe->ops.tuner_ops, &mt2060_tuner_ops, sizeof(fe->ops.tuner_ops));
 502         fe->ops.tuner_ops.release = NULL;
 503         fe->tuner_priv = dev;
 504         i2c_set_clientdata(client, dev);
 505
 506         return 0;
 507 err:
 508         dev_dbg(&client->dev, "failed=%d\n", ret);
 509         return ret;
 510 }
 511
 512 static int mt2060_remove(struct i2c_client *client)
 513 {
 514         dev_dbg(&client->dev, "\n");
 515
 516         return 0;
 517 }
 518
 519 static const struct i2c_device_id mt2060_id_table[] = {
 520         {"mt2060", 0},
 521         {}
 522 };
 523 MODULE_DEVICE_TABLE(i2c, mt2060_id_table);
 524
 525 static struct i2c_driver mt2060_driver = {
 526         .driver = {
 527                 .name = "mt2060",
 528                 .suppress_bind_attrs = true,
 529         },
 530         .probe          = mt2060_probe,
 531         .remove         = mt2060_remove,
 532         .id_table       = mt2060_id_table,
 533 };
 534
 535 module_i2c_driver(mt2060_driver);
 536
 537 MODULE_AUTHOR("Olivier DANET");
 538 MODULE_DESCRIPTION("Microtune MT2060 silicon tuner driver");
 539 MODULE_LICENSE("GPL");