drivers/media/dvb-frontends/itd1000.c

   1 /*
   2  *  Driver for the Integrant ITD1000 "Zero-IF Tuner IC for Direct Broadcast Satellite"
   3  *
   4  *  Copyright (c) 2007-8 Patrick Boettcher <pb@linuxtv.org>
   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 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/delay.h>
  25 #include <linux/dvb/frontend.h>
  26 #include <linux/i2c.h>
  27 #include <linux/slab.h>
  28
  29 #include "dvb_frontend.h"
  30
  31 #include "itd1000.h"
  32 #include "itd1000_priv.h"
  33
  34 static int debug;
  35 module_param(debug, int, 0644);
  36 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
  37
  38 #define itd_dbg(args...)  do { \
  39         if (debug) { \
  40                 printk(KERN_DEBUG   "ITD1000: " args);\
  41         } \
  42 } while (0)
  43
  44 #define itd_warn(args...) do { \
  45         printk(KERN_WARNING "ITD1000: " args); \
  46 } while (0)
  47
  48 #define itd_info(args...) do { \
  49         printk(KERN_INFO    "ITD1000: " args); \
  50 } while (0)
  51
  52 /* don't write more than one byte with flexcop behind */
  53 static int itd1000_write_regs(struct itd1000_state *state, u8 reg, u8 v[], u8 len)
  54 {
  55         u8 buf[1+len];
  56         struct i2c_msg msg = {
  57                 .addr = state->cfg->i2c_address, .flags = 0, .buf = buf, .len = len+1
  58         };
  59         buf[0] = reg;
  60         memcpy(&buf[1], v, len);
  61
  62         /* itd_dbg("wr %02x: %02x\n", reg, v[0]); */
  63
  64         if (i2c_transfer(state->i2c, &msg, 1) != 1) {
  65                 printk(KERN_WARNING "itd1000 I2C write failed\n");
  66                 return -EREMOTEIO;
  67         }
  68         return 0;
  69 }
  70
  71 static int itd1000_read_reg(struct itd1000_state *state, u8 reg)
  72 {
  73         u8 val;
  74         struct i2c_msg msg[2] = {
  75                 { .addr = state->cfg->i2c_address, .flags = 0,        .buf = &reg, .len = 1 },
  76                 { .addr = state->cfg->i2c_address, .flags = I2C_M_RD, .buf = &val, .len = 1 },
  77         };
  78
  79         /* ugly flexcop workaround */
  80         itd1000_write_regs(state, (reg - 1) & 0xff, &state->shadow[(reg - 1) & 0xff], 1);
  81
  82         if (i2c_transfer(state->i2c, msg, 2) != 2) {
  83                 itd_warn("itd1000 I2C read failed\n");
  84                 return -EREMOTEIO;
  85         }
  86         return val;
  87 }
  88
  89 static inline int itd1000_write_reg(struct itd1000_state *state, u8 r, u8 v)
  90 {
  91         int ret = itd1000_write_regs(state, r, &v, 1);
  92         state->shadow[r] = v;
  93         return ret;
  94 }
  95
  96
  97 static struct {
  98         u32 symbol_rate;
  99         u8  pgaext  : 4; /* PLLFH */
 100         u8  bbgvmin : 4; /* BBGVMIN */
 101 } itd1000_lpf_pga[] = {
 102         {        0, 0x8, 0x3 },
 103         {  5200000, 0x8, 0x3 },
 104         { 12200000, 0x4, 0x3 },
 105         { 15400000, 0x2, 0x3 },
 106         { 19800000, 0x2, 0x3 },
 107         { 21500000, 0x2, 0x3 },
 108         { 24500000, 0x2, 0x3 },
 109         { 28400000, 0x2, 0x3 },
 110         { 33400000, 0x2, 0x3 },
 111         { 34400000, 0x1, 0x4 },
 112         { 34400000, 0x1, 0x4 },
 113         { 38400000, 0x1, 0x4 },
 114         { 38400000, 0x1, 0x4 },
 115         { 40400000, 0x1, 0x4 },
 116         { 45400000, 0x1, 0x4 },
 117 };
 118
 119 static void itd1000_set_lpf_bw(struct itd1000_state *state, u32 symbol_rate)
 120 {
 121         u8 i;
 122         u8 con1    = itd1000_read_reg(state, CON1)    & 0xfd;
 123         u8 pllfh   = itd1000_read_reg(state, PLLFH)   & 0x0f;
 124         u8 bbgvmin = itd1000_read_reg(state, BBGVMIN) & 0xf0;
 125         u8 bw      = itd1000_read_reg(state, BW)      & 0xf0;
 126
 127         itd_dbg("symbol_rate = %d\n", symbol_rate);
 128
 129         /* not sure what is that ? - starting to download the table */
 130         itd1000_write_reg(state, CON1, con1 | (1 << 1));
 131
 132         for (i = 0; i < ARRAY_SIZE(itd1000_lpf_pga); i++)
 133                 if (symbol_rate < itd1000_lpf_pga[i].symbol_rate) {
 134                         itd_dbg("symrate: index: %d pgaext: %x, bbgvmin: %x\n", i, itd1000_lpf_pga[i].pgaext, itd1000_lpf_pga[i].bbgvmin);
 135                         itd1000_write_reg(state, PLLFH,   pllfh | (itd1000_lpf_pga[i].pgaext << 4));
 136                         itd1000_write_reg(state, BBGVMIN, bbgvmin | (itd1000_lpf_pga[i].bbgvmin));
 137                         itd1000_write_reg(state, BW,      bw | (i & 0x0f));
 138                         break;
 139                 }
 140
 141         itd1000_write_reg(state, CON1, con1 | (0 << 1));
 142 }
 143
 144 static struct {
 145         u8 vcorg;
 146         u32 fmax_rg;
 147 } itd1000_vcorg[] = {
 148         {  1,  920000 },
 149         {  2,  971000 },
 150         {  3, 1031000 },
 151         {  4, 1091000 },
 152         {  5, 1171000 },
 153         {  6, 1281000 },
 154         {  7, 1381000 },
 155         {  8,  500000 },        /* this is intentional. */
 156         {  9, 1451000 },
 157         { 10, 1531000 },
 158         { 11, 1631000 },
 159         { 12, 1741000 },
 160         { 13, 1891000 },
 161         { 14, 2071000 },
 162         { 15, 2250000 },
 163 };
 164
 165 static void itd1000_set_vco(struct itd1000_state *state, u32 freq_khz)
 166 {
 167         u8 i;
 168         u8 gvbb_i2c     = itd1000_read_reg(state, GVBB_I2C) & 0xbf;
 169         u8 vco_chp1_i2c = itd1000_read_reg(state, VCO_CHP1_I2C) & 0x0f;
 170         u8 adcout;
 171
 172         /* reserved bit again (reset ?) */
 173         itd1000_write_reg(state, GVBB_I2C, gvbb_i2c | (1 << 6));
 174
 175         for (i = 0; i < ARRAY_SIZE(itd1000_vcorg); i++) {
 176                 if (freq_khz < itd1000_vcorg[i].fmax_rg) {
 177                         itd1000_write_reg(state, VCO_CHP1_I2C, vco_chp1_i2c | (itd1000_vcorg[i].vcorg << 4));
 178                         msleep(1);
 179
 180                         adcout = itd1000_read_reg(state, PLLLOCK) & 0x0f;
 181
 182                         itd_dbg("VCO: %dkHz: %d -> ADCOUT: %d %02x\n", freq_khz, itd1000_vcorg[i].vcorg, adcout, vco_chp1_i2c);
 183
 184                         if (adcout > 13) {
 185                                 if (!(itd1000_vcorg[i].vcorg == 7 || itd1000_vcorg[i].vcorg == 15))
 186                                         itd1000_write_reg(state, VCO_CHP1_I2C, vco_chp1_i2c | ((itd1000_vcorg[i].vcorg + 1) << 4));
 187                         } else if (adcout < 2) {
 188                                 if (!(itd1000_vcorg[i].vcorg == 1 || itd1000_vcorg[i].vcorg == 9))
 189                                         itd1000_write_reg(state, VCO_CHP1_I2C, vco_chp1_i2c | ((itd1000_vcorg[i].vcorg - 1) << 4));
 190                         }
 191                         break;
 192                 }
 193         }
 194 }
 195
 196 static const struct {
 197         u32 freq;
 198         u8 values[10]; /* RFTR, RFST1 - RFST9 */
 199 } itd1000_fre_values[] = {
 200         { 1075000, { 0x59, 0x1d, 0x1c, 0x17, 0x16, 0x0f, 0x0e, 0x0c, 0x0b, 0x0a } },
 201         { 1250000, { 0x89, 0x1e, 0x1d, 0x17, 0x15, 0x0f, 0x0e, 0x0c, 0x0b, 0x0a } },
 202         { 1450000, { 0x89, 0x1e, 0x1d, 0x17, 0x15, 0x0f, 0x0e, 0x0c, 0x0b, 0x0a } },
 203         { 1650000, { 0x69, 0x1e, 0x1d, 0x17, 0x15, 0x0f, 0x0e, 0x0c, 0x0b, 0x0a } },
 204         { 1750000, { 0x69, 0x1e, 0x17, 0x15, 0x14, 0x0f, 0x0e, 0x0c, 0x0b, 0x0a } },
 205         { 1850000, { 0x69, 0x1d, 0x17, 0x16, 0x14, 0x0f, 0x0e, 0x0d, 0x0b, 0x0a } },
 206         { 1900000, { 0x69, 0x1d, 0x17, 0x15, 0x14, 0x0f, 0x0e, 0x0d, 0x0b, 0x0a } },
 207         { 1950000, { 0x69, 0x1d, 0x17, 0x16, 0x14, 0x13, 0x0e, 0x0d, 0x0b, 0x0a } },
 208         { 2050000, { 0x69, 0x1e, 0x1d, 0x17, 0x16, 0x14, 0x13, 0x0e, 0x0b, 0x0a } },
 209         { 2150000, { 0x69, 0x1d, 0x1c, 0x17, 0x15, 0x14, 0x13, 0x0f, 0x0e, 0x0b } }
 210 };
 211
 212
 213 #define FREF 16
 214
 215 static void itd1000_set_lo(struct itd1000_state *state, u32 freq_khz)
 216 {
 217         int i, j;
 218         u32 plln, pllf;
 219         u64 tmp;
 220
 221         plln = (freq_khz * 1000) / 2 / FREF;
 222
 223         /* Compute the factional part times 1000 */
 224         tmp  = plln % 1000000;
 225         plln /= 1000000;
 226
 227         tmp *= 1048576;
 228         do_div(tmp, 1000000);
 229         pllf = (u32) tmp;
 230
 231         state->frequency = ((plln * 1000) + (pllf * 1000)/1048576) * 2*FREF;
 232         itd_dbg("frequency: %dkHz (wanted) %dkHz (set), PLLF = %d, PLLN = %d\n", freq_khz, state->frequency, pllf, plln);
 233
 234         itd1000_write_reg(state, PLLNH, 0x80); /* PLLNH */
 235         itd1000_write_reg(state, PLLNL, plln & 0xff);
 236         itd1000_write_reg(state, PLLFH, (itd1000_read_reg(state, PLLFH) & 0xf0) | ((pllf >> 16) & 0x0f));
 237         itd1000_write_reg(state, PLLFM, (pllf >> 8) & 0xff);
 238         itd1000_write_reg(state, PLLFL, (pllf >> 0) & 0xff);
 239
 240         for (i = 0; i < ARRAY_SIZE(itd1000_fre_values); i++) {
 241                 if (freq_khz <= itd1000_fre_values[i].freq) {
 242                         itd_dbg("fre_values: %d\n", i);
 243                         itd1000_write_reg(state, RFTR, itd1000_fre_values[i].values[0]);
 244                         for (j = 0; j < 9; j++)
 245                                 itd1000_write_reg(state, RFST1+j, itd1000_fre_values[i].values[j+1]);
 246                         break;
 247                 }
 248         }
 249
 250         itd1000_set_vco(state, freq_khz);
 251 }
 252
 253 static int itd1000_set_parameters(struct dvb_frontend *fe)
 254 {
 255         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 256         struct itd1000_state *state = fe->tuner_priv;
 257         u8 pllcon1;
 258
 259         itd1000_set_lo(state, c->frequency);
 260         itd1000_set_lpf_bw(state, c->symbol_rate);
 261
 262         pllcon1 = itd1000_read_reg(state, PLLCON1) & 0x7f;
 263         itd1000_write_reg(state, PLLCON1, pllcon1 | (1 << 7));
 264         itd1000_write_reg(state, PLLCON1, pllcon1);
 265
 266         return 0;
 267 }
 268
 269 static int itd1000_get_frequency(struct dvb_frontend *fe, u32 *frequency)
 270 {
 271         struct itd1000_state *state = fe->tuner_priv;
 272         *frequency = state->frequency;
 273         return 0;
 274 }
 275
 276 static int itd1000_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
 277 {
 278         return 0;
 279 }
 280
 281 static u8 itd1000_init_tab[][2] = {
 282         { PLLCON1,       0x65 }, /* Register does not change */
 283         { PLLNH,         0x80 }, /* Bits [7:6] do not change */
 284         { RESERVED_0X6D, 0x3b },
 285         { VCO_CHP2_I2C,  0x12 },
 286         { 0x72,          0xf9 }, /* No such regsister defined */
 287         { RESERVED_0X73, 0xff },
 288         { RESERVED_0X74, 0xb2 },
 289         { RESERVED_0X75, 0xc7 },
 290         { EXTGVBBRF,     0xf0 },
 291         { DIVAGCCK,      0x80 },
 292         { BBTR,          0xa0 },
 293         { RESERVED_0X7E, 0x4f },
 294         { 0x82,          0x88 }, /* No such regsister defined */
 295         { 0x83,          0x80 }, /* No such regsister defined */
 296         { 0x84,          0x80 }, /* No such regsister defined */
 297         { RESERVED_0X85, 0x74 },
 298         { RESERVED_0X86, 0xff },
 299         { RESERVED_0X88, 0x02 },
 300         { RESERVED_0X89, 0x16 },
 301         { RFST0,         0x1f },
 302         { RESERVED_0X94, 0x66 },
 303         { RESERVED_0X95, 0x66 },
 304         { RESERVED_0X96, 0x77 },
 305         { RESERVED_0X97, 0x99 },
 306         { RESERVED_0X98, 0xff },
 307         { RESERVED_0X99, 0xfc },
 308         { RESERVED_0X9A, 0xba },
 309         { RESERVED_0X9B, 0xaa },
 310 };
 311
 312 static u8 itd1000_reinit_tab[][2] = {
 313         { VCO_CHP1_I2C, 0x8a },
 314         { BW,           0x87 },
 315         { GVBB_I2C,     0x03 },
 316         { BBGVMIN,      0x03 },
 317         { CON1,         0x2e },
 318 };
 319
 320
 321 static int itd1000_init(struct dvb_frontend *fe)
 322 {
 323         struct itd1000_state *state = fe->tuner_priv;
 324         int i;
 325
 326         for (i = 0; i < ARRAY_SIZE(itd1000_init_tab); i++)
 327                 itd1000_write_reg(state, itd1000_init_tab[i][0], itd1000_init_tab[i][1]);
 328
 329         for (i = 0; i < ARRAY_SIZE(itd1000_reinit_tab); i++)
 330                 itd1000_write_reg(state, itd1000_reinit_tab[i][0], itd1000_reinit_tab[i][1]);
 331
 332         return 0;
 333 }
 334
 335 static int itd1000_sleep(struct dvb_frontend *fe)
 336 {
 337         return 0;
 338 }
 339
 340 static int itd1000_release(struct dvb_frontend *fe)
 341 {
 342         kfree(fe->tuner_priv);
 343         fe->tuner_priv = NULL;
 344         return 0;
 345 }
 346
 347 static const struct dvb_tuner_ops itd1000_tuner_ops = {
 348         .info = {
 349                 .name           = "Integrant ITD1000",
 350                 .frequency_min  = 950000,
 351                 .frequency_max  = 2150000,
 352                 .frequency_step = 125,     /* kHz for QPSK frontends */
 353         },
 354
 355         .release       = itd1000_release,
 356
 357         .init          = itd1000_init,
 358         .sleep         = itd1000_sleep,
 359
 360         .set_params    = itd1000_set_parameters,
 361         .get_frequency = itd1000_get_frequency,
 362         .get_bandwidth = itd1000_get_bandwidth
 363 };
 364
 365
 366 struct dvb_frontend *itd1000_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct itd1000_config *cfg)
 367 {
 368         struct itd1000_state *state = NULL;
 369         u8 i = 0;
 370
 371         state = kzalloc(sizeof(struct itd1000_state), GFP_KERNEL);
 372         if (state == NULL)
 373                 return NULL;
 374
 375         state->cfg = cfg;
 376         state->i2c = i2c;
 377
 378         i = itd1000_read_reg(state, 0);
 379         if (i != 0) {
 380                 kfree(state);
 381                 return NULL;
 382         }
 383         itd_info("successfully identified (ID: %d)\n", i);
 384
 385         memset(state->shadow, 0xff, sizeof(state->shadow));
 386         for (i = 0x65; i < 0x9c; i++)
 387                 state->shadow[i] = itd1000_read_reg(state, i);
 388
 389         memcpy(&fe->ops.tuner_ops, &itd1000_tuner_ops, sizeof(struct dvb_tuner_ops));
 390
 391         fe->tuner_priv = state;
 392
 393         return fe;
 394 }
 395 EXPORT_SYMBOL(itd1000_attach);
 396
 397 MODULE_AUTHOR("Patrick Boettcher <pb@linuxtv.org>");
 398 MODULE_DESCRIPTION("Integrant ITD1000 driver");
 399 MODULE_LICENSE("GPL");