drivers/media/dvb-frontends/zl10036.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for Zarlink zl10036 DVB-S silicon tuner
   4  *
   5  * Copyright (C) 2006 Tino Reichardt
   6  * Copyright (C) 2007-2009 Matthias Schwarzott <zzam@gentoo.de>
   7  *
   8  **
   9  * The data sheet for this tuner can be found at:
  10  *    http://www.mcmilk.de/projects/dvb-card/datasheets/ZL10036.pdf
  11  *
  12  * This one is working: (at my Avermedia DVB-S Pro)
  13  * - zl10036 (40pin, FTA)
  14  *
  15  * A driver for zl10038 should be very similar.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/dvb/frontend.h>
  20 #include <linux/slab.h>
  21 #include <linux/types.h>
  22
  23 #include "zl10036.h"
  24
  25 static int zl10036_debug;
  26 #define dprintk(level, args...) \
  27         do { if (zl10036_debug & level) printk(KERN_DEBUG "zl10036: " args); \
  28         } while (0)
  29
  30 #define deb_info(args...)  dprintk(0x01, args)
  31 #define deb_i2c(args...)  dprintk(0x02, args)
  32
  33 struct zl10036_state {
  34         struct i2c_adapter *i2c;
  35         const struct zl10036_config *config;
  36         u32 frequency;
  37         u8 br, bf;
  38 };
  39
  40
  41 /* This driver assumes the tuner is driven by a 10.111MHz Cristal */
  42 #define _XTAL 10111
  43
  44 /* Some of the possible dividers:
  45  *   64, (write 0x05 to reg), freq step size   158kHz
  46  *   10, (write 0x0a to reg), freq step size 1.011kHz (used here)
  47  *    5, (write 0x09 to reg), freq step size 2.022kHz
  48  */
  49
  50 #define _RDIV 10
  51 #define _RDIV_REG 0x0a
  52 #define _FR   (_XTAL/_RDIV)
  53
  54 #define STATUS_POR 0x80 /* Power on Reset */
  55 #define STATUS_FL  0x40 /* Frequency & Phase Lock */
  56
  57 /* read/write for zl10036 and zl10038 */
  58
  59 static int zl10036_read_status_reg(struct zl10036_state *state)
  60 {
  61         u8 status;
  62         struct i2c_msg msg[1] = {
  63                 { .addr = state->config->tuner_address, .flags = I2C_M_RD,
  64                   .buf = &status, .len = sizeof(status) },
  65         };
  66
  67         if (i2c_transfer(state->i2c, msg, 1) != 1) {
  68                 printk(KERN_ERR "%s: i2c read failed at addr=%02x\n",
  69                         __func__, state->config->tuner_address);
  70                 return -EIO;
  71         }
  72
  73         deb_i2c("R(status): %02x  [FL=%d]\n", status,
  74                 (status & STATUS_FL) ? 1 : 0);
  75         if (status & STATUS_POR)
  76                 deb_info("%s: Power-On-Reset bit enabled - need to initialize the tuner\n",
  77                          __func__);
  78
  79         return status;
  80 }
  81
  82 static int zl10036_write(struct zl10036_state *state, u8 buf[], u8 count)
  83 {
  84         struct i2c_msg msg[1] = {
  85                 { .addr = state->config->tuner_address, .flags = 0,
  86                   .buf = buf, .len = count },
  87         };
  88         u8 reg = 0;
  89         int ret;
  90
  91         if (zl10036_debug & 0x02) {
  92                 /* every 8bit-value satisifes this!
  93                  * so only check for debug log */
  94                 if ((buf[0] & 0x80) == 0x00)
  95                         reg = 2;
  96                 else if ((buf[0] & 0xc0) == 0x80)
  97                         reg = 4;
  98                 else if ((buf[0] & 0xf0) == 0xc0)
  99                         reg = 6;
 100                 else if ((buf[0] & 0xf0) == 0xd0)
 101                         reg = 8;
 102                 else if ((buf[0] & 0xf0) == 0xe0)
 103                         reg = 10;
 104                 else if ((buf[0] & 0xf0) == 0xf0)
 105                         reg = 12;
 106
 107                 deb_i2c("W(%d):", reg);
 108                 {
 109                         int i;
 110                         for (i = 0; i < count; i++)
 111                                 printk(KERN_CONT " %02x", buf[i]);
 112                         printk(KERN_CONT "\n");
 113                 }
 114         }
 115
 116         ret = i2c_transfer(state->i2c, msg, 1);
 117         if (ret != 1) {
 118                 printk(KERN_ERR "%s: i2c error, ret=%d\n", __func__, ret);
 119                 return -EIO;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void zl10036_release(struct dvb_frontend *fe)
 126 {
 127         struct zl10036_state *state = fe->tuner_priv;
 128
 129         fe->tuner_priv = NULL;
 130         kfree(state);
 131 }
 132
 133 static int zl10036_sleep(struct dvb_frontend *fe)
 134 {
 135         struct zl10036_state *state = fe->tuner_priv;
 136         u8 buf[] = { 0xf0, 0x80 }; /* regs 12/13 */
 137         int ret;
 138
 139         deb_info("%s\n", __func__);
 140
 141         if (fe->ops.i2c_gate_ctrl)
 142                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 143
 144         ret = zl10036_write(state, buf, sizeof(buf));
 145
 146         if (fe->ops.i2c_gate_ctrl)
 147                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 148
 149         return ret;
 150 }
 151
 152 /*
 153  * register map of the ZL10036/ZL10038
 154  *
 155  * reg[default] content
 156  *  2[0x00]:   0 | N14 | N13 | N12 | N11 | N10 |  N9 |  N8
 157  *  3[0x00]:  N7 |  N6 |  N5 |  N4 |  N3 |  N2 |  N1 |  N0
 158  *  4[0x80]:   1 |   0 | RFG | BA1 | BA0 | BG1 | BG0 | LEN
 159  *  5[0x00]:  P0 |  C1 |  C0 |  R4 |  R3 |  R2 |  R1 |  R0
 160  *  6[0xc0]:   1 |   1 |   0 |   0 | RSD |   0 |   0 |   0
 161  *  7[0x20]:  P1 | BF6 | BF5 | BF4 | BF3 | BF2 | BF1 |   0
 162  *  8[0xdb]:   1 |   1 |   0 |   1 |   0 |  CC |   1 |   1
 163  *  9[0x30]: VSD |  V2 |  V1 |  V0 |  S3 |  S2 |  S1 |  S0
 164  * 10[0xe1]:   1 |   1 |   1 |   0 |   0 | LS2 | LS1 | LS0
 165  * 11[0xf5]:  WS | WH2 | WH1 | WH0 | WL2 | WL1 | WL0 | WRE
 166  * 12[0xf0]:   1 |   1 |   1 |   1 |   0 |   0 |   0 |   0
 167  * 13[0x28]:  PD | BR4 | BR3 | BR2 | BR1 | BR0 | CLR |  TL
 168  */
 169
 170 static int zl10036_set_frequency(struct zl10036_state *state, u32 frequency)
 171 {
 172         u8 buf[2];
 173         u32 div, foffset;
 174
 175         div = (frequency + _FR/2) / _FR;
 176         state->frequency = div * _FR;
 177
 178         foffset = frequency - state->frequency;
 179
 180         buf[0] = (div >> 8) & 0x7f;
 181         buf[1] = (div >> 0) & 0xff;
 182
 183         deb_info("%s: ftodo=%u fpriv=%u ferr=%d div=%u\n", __func__,
 184                 frequency, state->frequency, foffset, div);
 185
 186         return zl10036_write(state, buf, sizeof(buf));
 187 }
 188
 189 static int zl10036_set_bandwidth(struct zl10036_state *state, u32 fbw)
 190 {
 191         /* fbw is measured in kHz */
 192         u8 br, bf;
 193         int ret;
 194         u8 buf_bf[] = {
 195                 0xc0, 0x00, /*   6/7: rsd=0 bf=0 */
 196         };
 197         u8 buf_br[] = {
 198                 0xf0, 0x00, /* 12/13: br=0xa clr=0 tl=0*/
 199         };
 200         u8 zl10036_rsd_off[] = { 0xc8 }; /* set RSD=1 */
 201
 202         /* ensure correct values */
 203         if (fbw > 35000)
 204                 fbw = 35000;
 205         if (fbw <  8000)
 206                 fbw =  8000;
 207
 208 #define _BR_MAXIMUM (_XTAL/575) /* _XTAL / 575kHz = 17 */
 209
 210         /* <= 28,82 MHz */
 211         if (fbw <= 28820) {
 212                 br = _BR_MAXIMUM;
 213         } else {
 214                 /*
 215                  *  f(bw)=34,6MHz f(xtal)=10.111MHz
 216                  *  br = (10111/34600) * 63 * 1/K = 14;
 217                  */
 218                 br = ((_XTAL * 21 * 1000) / (fbw * 419));
 219         }
 220
 221         /* ensure correct values */
 222         if (br < 4)
 223                 br = 4;
 224         if (br > _BR_MAXIMUM)
 225                 br = _BR_MAXIMUM;
 226
 227         /*
 228          * k = 1.257
 229          * bf = fbw/_XTAL * br * k - 1 */
 230
 231         bf = (fbw * br * 1257) / (_XTAL * 1000) - 1;
 232
 233         /* ensure correct values */
 234         if (bf > 62)
 235                 bf = 62;
 236
 237         buf_bf[1] = (bf << 1) & 0x7e;
 238         buf_br[1] = (br << 2) & 0x7c;
 239         deb_info("%s: BW=%d br=%u bf=%u\n", __func__, fbw, br, bf);
 240
 241         if (br != state->br) {
 242                 ret = zl10036_write(state, buf_br, sizeof(buf_br));
 243                 if (ret < 0)
 244                         return ret;
 245         }
 246
 247         if (bf != state->bf) {
 248                 ret = zl10036_write(state, buf_bf, sizeof(buf_bf));
 249                 if (ret < 0)
 250                         return ret;
 251
 252                 /* time = br/(32* fxtal) */
 253                 /* minimal sleep time to be calculated
 254                  * maximum br is 63 -> max time = 2 /10 MHz = 2e-7 */
 255                 msleep(1);
 256
 257                 ret = zl10036_write(state, zl10036_rsd_off,
 258                         sizeof(zl10036_rsd_off));
 259                 if (ret < 0)
 260                         return ret;
 261         }
 262
 263         state->br = br;
 264         state->bf = bf;
 265
 266         return 0;
 267 }
 268
 269 static int zl10036_set_gain_params(struct zl10036_state *state,
 270         int c)
 271 {
 272         u8 buf[2];
 273         u8 rfg, ba, bg;
 274
 275         /* default values */
 276         rfg = 0; /* enable when using an lna */
 277         ba = 1;
 278         bg = 1;
 279
 280         /* reg 4 */
 281         buf[0] = 0x80 | ((rfg << 5) & 0x20)
 282                 | ((ba  << 3) & 0x18) | ((bg  << 1) & 0x06);
 283
 284         if (!state->config->rf_loop_enable)
 285                 buf[0] |= 0x01;
 286
 287         /* P0=0 */
 288         buf[1] = _RDIV_REG | ((c << 5) & 0x60);
 289
 290         deb_info("%s: c=%u rfg=%u ba=%u bg=%u\n", __func__, c, rfg, ba, bg);
 291         return zl10036_write(state, buf, sizeof(buf));
 292 }
 293
 294 static int zl10036_set_params(struct dvb_frontend *fe)
 295 {
 296         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 297         struct zl10036_state *state = fe->tuner_priv;
 298         int ret = 0;
 299         u32 frequency = p->frequency;
 300         u32 fbw;
 301         int i;
 302         u8 c;
 303
 304         /* ensure correct values
 305          * maybe redundant as core already checks this */
 306         if ((frequency < fe->ops.info.frequency_min_hz / kHz)
 307         ||  (frequency > fe->ops.info.frequency_max_hz / kHz))
 308                 return -EINVAL;
 309
 310         /*
 311          * alpha = 1.35 for dvb-s
 312          * fBW = (alpha*symbolrate)/(2*0.8)
 313          * 1.35 / (2*0.8) = 27 / 32
 314          */
 315         fbw = (27 * p->symbol_rate) / 32;
 316
 317         /* scale to kHz */
 318         fbw /= 1000;
 319
 320         /* Add safe margin of 3MHz */
 321         fbw += 3000;
 322
 323         /* setting the charge pump - guessed values */
 324         if (frequency < 950000)
 325                 return -EINVAL;
 326         else if (frequency < 1250000)
 327                 c = 0;
 328         else if (frequency < 1750000)
 329                 c = 1;
 330         else if (frequency < 2175000)
 331                 c = 2;
 332         else
 333                 return -EINVAL;
 334
 335         if (fe->ops.i2c_gate_ctrl)
 336                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 337
 338         ret = zl10036_set_gain_params(state, c);
 339         if (ret < 0)
 340                 goto error;
 341
 342         ret = zl10036_set_frequency(state, p->frequency);
 343         if (ret < 0)
 344                 goto error;
 345
 346         ret = zl10036_set_bandwidth(state, fbw);
 347         if (ret < 0)
 348                 goto error;
 349
 350         /* wait for tuner lock - no idea if this is really needed */
 351         for (i = 0; i < 20; i++) {
 352                 ret = zl10036_read_status_reg(state);
 353                 if (ret < 0)
 354                         goto error;
 355
 356                 /* check Frequency & Phase Lock Bit */
 357                 if (ret & STATUS_FL)
 358                         break;
 359
 360                 msleep(10);
 361         }
 362
 363 error:
 364         if (fe->ops.i2c_gate_ctrl)
 365                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 366
 367         return ret;
 368 }
 369
 370 static int zl10036_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 371 {
 372         struct zl10036_state *state = fe->tuner_priv;
 373
 374         *frequency = state->frequency;
 375
 376         return 0;
 377 }
 378
 379 static int zl10036_init_regs(struct zl10036_state *state)
 380 {
 381         int ret;
 382         int i;
 383
 384         /* could also be one block from reg 2 to 13 and additional 10/11 */
 385         u8 zl10036_init_tab[][2] = {
 386                 { 0x04, 0x00 },         /*   2/3: div=0x400 - arbitrary value */
 387                 { 0x8b, _RDIV_REG },    /*   4/5: rfg=0 ba=1 bg=1 len=? */
 388                                         /*        p0=0 c=0 r=_RDIV_REG */
 389                 { 0xc0, 0x20 },         /*   6/7: rsd=0 bf=0x10 */
 390                 { 0xd3, 0x40 },         /*   8/9: from datasheet */
 391                 { 0xe3, 0x5b },         /* 10/11: lock window level */
 392                 { 0xf0, 0x28 },         /* 12/13: br=0xa clr=0 tl=0*/
 393                 { 0xe3, 0xf9 },         /* 10/11: unlock window level */
 394         };
 395
 396         /* invalid values to trigger writing */
 397         state->br = 0xff;
 398         state->bf = 0xff;
 399
 400         if (!state->config->rf_loop_enable)
 401                 zl10036_init_tab[1][0] |= 0x01;
 402
 403         deb_info("%s\n", __func__);
 404
 405         for (i = 0; i < ARRAY_SIZE(zl10036_init_tab); i++) {
 406                 ret = zl10036_write(state, zl10036_init_tab[i], 2);
 407                 if (ret < 0)
 408                         return ret;
 409         }
 410
 411         return 0;
 412 }
 413
 414 static int zl10036_init(struct dvb_frontend *fe)
 415 {
 416         struct zl10036_state *state = fe->tuner_priv;
 417         int ret = 0;
 418
 419         if (fe->ops.i2c_gate_ctrl)
 420                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 421
 422         ret = zl10036_read_status_reg(state);
 423         if (ret < 0)
 424                 return ret;
 425
 426         /* Only init if Power-on-Reset bit is set? */
 427         ret = zl10036_init_regs(state);
 428
 429         if (fe->ops.i2c_gate_ctrl)
 430                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 431
 432         return ret;
 433 }
 434
 435 static const struct dvb_tuner_ops zl10036_tuner_ops = {
 436         .info = {
 437                 .name = "Zarlink ZL10036",
 438                 .frequency_min_hz =  950 * MHz,
 439                 .frequency_max_hz = 2175 * MHz
 440         },
 441         .init = zl10036_init,
 442         .release = zl10036_release,
 443         .sleep = zl10036_sleep,
 444         .set_params = zl10036_set_params,
 445         .get_frequency = zl10036_get_frequency,
 446 };
 447
 448 struct dvb_frontend *zl10036_attach(struct dvb_frontend *fe,
 449                                     const struct zl10036_config *config,
 450                                     struct i2c_adapter *i2c)
 451 {
 452         struct zl10036_state *state;
 453         int ret;
 454
 455         if (!config) {
 456                 printk(KERN_ERR "%s: no config specified", __func__);
 457                 return NULL;
 458         }
 459
 460         state = kzalloc(sizeof(struct zl10036_state), GFP_KERNEL);
 461         if (!state)
 462                 return NULL;
 463
 464         state->config = config;
 465         state->i2c = i2c;
 466
 467         if (fe->ops.i2c_gate_ctrl)
 468                 fe->ops.i2c_gate_ctrl(fe, 1); /* open i2c_gate */
 469
 470         ret = zl10036_read_status_reg(state);
 471         if (ret < 0) {
 472                 printk(KERN_ERR "%s: No zl10036 found\n", __func__);
 473                 goto error;
 474         }
 475
 476         ret = zl10036_init_regs(state);
 477         if (ret < 0) {
 478                 printk(KERN_ERR "%s: tuner initialization failed\n",
 479                         __func__);
 480                 goto error;
 481         }
 482
 483         if (fe->ops.i2c_gate_ctrl)
 484                 fe->ops.i2c_gate_ctrl(fe, 0); /* close i2c_gate */
 485
 486         fe->tuner_priv = state;
 487
 488         memcpy(&fe->ops.tuner_ops, &zl10036_tuner_ops,
 489                 sizeof(struct dvb_tuner_ops));
 490         printk(KERN_INFO "%s: tuner initialization (%s addr=0x%02x) ok\n",
 491                 __func__, fe->ops.tuner_ops.info.name, config->tuner_address);
 492
 493         return fe;
 494
 495 error:
 496         kfree(state);
 497         return NULL;
 498 }
 499 EXPORT_SYMBOL(zl10036_attach);
 500
 501 module_param_named(debug, zl10036_debug, int, 0644);
 502 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 503 MODULE_DESCRIPTION("DVB ZL10036 driver");
 504 MODULE_AUTHOR("Tino Reichardt");
 505 MODULE_AUTHOR("Matthias Schwarzott");
 506 MODULE_LICENSE("GPL");