drivers/media/dvb/frontends/ves1820.c

   1 /*
   2     VES1820  - Single Chip Cable Channel Receiver driver module
   3
   4     Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
   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     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include <linux/delay.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/string.h>
  27 #include <linux/slab.h>
  28 #include <asm/div64.h>
  29
  30 #include "dvb_frontend.h"
  31 #include "ves1820.h"
  32
  33
  34
  35 struct ves1820_state {
  36         struct i2c_adapter* i2c;
  37         /* configuration settings */
  38         const struct ves1820_config* config;
  39         struct dvb_frontend frontend;
  40
  41         /* private demodulator data */
  42         u8 reg0;
  43         u8 pwm;
  44 };
  45
  46
  47 static int verbose;
  48
  49 static u8 ves1820_inittab[] = {
  50         0x69, 0x6A, 0x93, 0x1A, 0x12, 0x46, 0x26, 0x1A,
  51         0x43, 0x6A, 0xAA, 0xAA, 0x1E, 0x85, 0x43, 0x20,
  52         0xE0, 0x00, 0xA1, 0x00, 0x00, 0x00, 0x00, 0x00,
  53         0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
  54         0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  55         0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  56         0x00, 0x00, 0x00, 0x00, 0x40
  57 };
  58
  59 static int ves1820_writereg(struct ves1820_state *state, u8 reg, u8 data)
  60 {
  61         u8 buf[] = { 0x00, reg, data };
  62         struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 3 };
  63         int ret;
  64
  65         ret = i2c_transfer(state->i2c, &msg, 1);
  66
  67         if (ret != 1)
  68                 printk("ves1820: %s(): writereg error (reg == 0x%02x, "
  69                         "val == 0x%02x, ret == %i)\n", __func__, reg, data, ret);
  70
  71         return (ret != 1) ? -EREMOTEIO : 0;
  72 }
  73
  74 static u8 ves1820_readreg(struct ves1820_state *state, u8 reg)
  75 {
  76         u8 b0[] = { 0x00, reg };
  77         u8 b1[] = { 0 };
  78         struct i2c_msg msg[] = {
  79                 {.addr = state->config->demod_address,.flags = 0,.buf = b0,.len = 2},
  80                 {.addr = state->config->demod_address,.flags = I2C_M_RD,.buf = b1,.len = 1}
  81         };
  82         int ret;
  83
  84         ret = i2c_transfer(state->i2c, msg, 2);
  85
  86         if (ret != 2)
  87                 printk("ves1820: %s(): readreg error (reg == 0x%02x, "
  88                 "ret == %i)\n", __func__, reg, ret);
  89
  90         return b1[0];
  91 }
  92
  93 static int ves1820_setup_reg0(struct ves1820_state *state, u8 reg0, fe_spectral_inversion_t inversion)
  94 {
  95         reg0 |= state->reg0 & 0x62;
  96
  97         if (INVERSION_ON == inversion) {
  98                 if (!state->config->invert) reg0 |= 0x20;
  99                 else reg0 &= ~0x20;
 100         } else if (INVERSION_OFF == inversion) {
 101                 if (!state->config->invert) reg0 &= ~0x20;
 102                 else reg0 |= 0x20;
 103         }
 104
 105         ves1820_writereg(state, 0x00, reg0 & 0xfe);
 106         ves1820_writereg(state, 0x00, reg0 | 0x01);
 107
 108         state->reg0 = reg0;
 109
 110         return 0;
 111 }
 112
 113 static int ves1820_set_symbolrate(struct ves1820_state *state, u32 symbolrate)
 114 {
 115         s32 BDR;
 116         s32 BDRI;
 117         s16 SFIL = 0;
 118         u16 NDEC = 0;
 119         u32 ratio;
 120         u32 fin;
 121         u32 tmp;
 122         u64 fptmp;
 123         u64 fpxin;
 124
 125         if (symbolrate > state->config->xin / 2)
 126                 symbolrate = state->config->xin / 2;
 127
 128         if (symbolrate < 500000)
 129                 symbolrate = 500000;
 130
 131         if (symbolrate < state->config->xin / 16)
 132                 NDEC = 1;
 133         if (symbolrate < state->config->xin / 32)
 134                 NDEC = 2;
 135         if (symbolrate < state->config->xin / 64)
 136                 NDEC = 3;
 137
 138         /* yeuch! */
 139         fpxin = state->config->xin * 10;
 140         fptmp = fpxin; do_div(fptmp, 123);
 141         if (symbolrate < fptmp)
 142                 SFIL = 1;
 143         fptmp = fpxin; do_div(fptmp, 160);
 144         if (symbolrate < fptmp)
 145                 SFIL = 0;
 146         fptmp = fpxin; do_div(fptmp, 246);
 147         if (symbolrate < fptmp)
 148                 SFIL = 1;
 149         fptmp = fpxin; do_div(fptmp, 320);
 150         if (symbolrate < fptmp)
 151                 SFIL = 0;
 152         fptmp = fpxin; do_div(fptmp, 492);
 153         if (symbolrate < fptmp)
 154                 SFIL = 1;
 155         fptmp = fpxin; do_div(fptmp, 640);
 156         if (symbolrate < fptmp)
 157                 SFIL = 0;
 158         fptmp = fpxin; do_div(fptmp, 984);
 159         if (symbolrate < fptmp)
 160                 SFIL = 1;
 161
 162         fin = state->config->xin >> 4;
 163         symbolrate <<= NDEC;
 164         ratio = (symbolrate << 4) / fin;
 165         tmp = ((symbolrate << 4) % fin) << 8;
 166         ratio = (ratio << 8) + tmp / fin;
 167         tmp = (tmp % fin) << 8;
 168         ratio = (ratio << 8) + DIV_ROUND_CLOSEST(tmp, fin);
 169
 170         BDR = ratio;
 171         BDRI = (((state->config->xin << 5) / symbolrate) + 1) / 2;
 172
 173         if (BDRI > 0xFF)
 174                 BDRI = 0xFF;
 175
 176         SFIL = (SFIL << 4) | ves1820_inittab[0x0E];
 177
 178         NDEC = (NDEC << 6) | ves1820_inittab[0x03];
 179
 180         ves1820_writereg(state, 0x03, NDEC);
 181         ves1820_writereg(state, 0x0a, BDR & 0xff);
 182         ves1820_writereg(state, 0x0b, (BDR >> 8) & 0xff);
 183         ves1820_writereg(state, 0x0c, (BDR >> 16) & 0x3f);
 184
 185         ves1820_writereg(state, 0x0d, BDRI);
 186         ves1820_writereg(state, 0x0e, SFIL);
 187
 188         return 0;
 189 }
 190
 191 static int ves1820_init(struct dvb_frontend* fe)
 192 {
 193         struct ves1820_state* state = fe->demodulator_priv;
 194         int i;
 195
 196         ves1820_writereg(state, 0, 0);
 197
 198         for (i = 0; i < sizeof(ves1820_inittab); i++)
 199                 ves1820_writereg(state, i, ves1820_inittab[i]);
 200         if (state->config->selagc)
 201                 ves1820_writereg(state, 2, ves1820_inittab[2] | 0x08);
 202
 203         ves1820_writereg(state, 0x34, state->pwm);
 204
 205         return 0;
 206 }
 207
 208 static int ves1820_set_parameters(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 209 {
 210         struct ves1820_state* state = fe->demodulator_priv;
 211         static const u8 reg0x00[] = { 0x00, 0x04, 0x08, 0x0c, 0x10 };
 212         static const u8 reg0x01[] = { 140, 140, 106, 100, 92 };
 213         static const u8 reg0x05[] = { 135, 100, 70, 54, 38 };
 214         static const u8 reg0x08[] = { 162, 116, 67, 52, 35 };
 215         static const u8 reg0x09[] = { 145, 150, 106, 126, 107 };
 216         int real_qam = p->u.qam.modulation - QAM_16;
 217
 218         if (real_qam < 0 || real_qam > 4)
 219                 return -EINVAL;
 220
 221         if (fe->ops.tuner_ops.set_params) {
 222                 fe->ops.tuner_ops.set_params(fe, p);
 223                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 224         }
 225
 226         ves1820_set_symbolrate(state, p->u.qam.symbol_rate);
 227         ves1820_writereg(state, 0x34, state->pwm);
 228
 229         ves1820_writereg(state, 0x01, reg0x01[real_qam]);
 230         ves1820_writereg(state, 0x05, reg0x05[real_qam]);
 231         ves1820_writereg(state, 0x08, reg0x08[real_qam]);
 232         ves1820_writereg(state, 0x09, reg0x09[real_qam]);
 233
 234         ves1820_setup_reg0(state, reg0x00[real_qam], p->inversion);
 235         ves1820_writereg(state, 2, ves1820_inittab[2] | (state->config->selagc ? 0x08 : 0));
 236         return 0;
 237 }
 238
 239 static int ves1820_read_status(struct dvb_frontend* fe, fe_status_t* status)
 240 {
 241         struct ves1820_state* state = fe->demodulator_priv;
 242         int sync;
 243
 244         *status = 0;
 245         sync = ves1820_readreg(state, 0x11);
 246
 247         if (sync & 1)
 248                 *status |= FE_HAS_SIGNAL;
 249
 250         if (sync & 2)
 251                 *status |= FE_HAS_CARRIER;
 252
 253         if (sync & 2)   /* XXX FIXME! */
 254                 *status |= FE_HAS_VITERBI;
 255
 256         if (sync & 4)
 257                 *status |= FE_HAS_SYNC;
 258
 259         if (sync & 8)
 260                 *status |= FE_HAS_LOCK;
 261
 262         return 0;
 263 }
 264
 265 static int ves1820_read_ber(struct dvb_frontend* fe, u32* ber)
 266 {
 267         struct ves1820_state* state = fe->demodulator_priv;
 268
 269         u32 _ber = ves1820_readreg(state, 0x14) |
 270                         (ves1820_readreg(state, 0x15) << 8) |
 271                         ((ves1820_readreg(state, 0x16) & 0x0f) << 16);
 272         *ber = 10 * _ber;
 273
 274         return 0;
 275 }
 276
 277 static int ves1820_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 278 {
 279         struct ves1820_state* state = fe->demodulator_priv;
 280
 281         u8 gain = ves1820_readreg(state, 0x17);
 282         *strength = (gain << 8) | gain;
 283
 284         return 0;
 285 }
 286
 287 static int ves1820_read_snr(struct dvb_frontend* fe, u16* snr)
 288 {
 289         struct ves1820_state* state = fe->demodulator_priv;
 290
 291         u8 quality = ~ves1820_readreg(state, 0x18);
 292         *snr = (quality << 8) | quality;
 293
 294         return 0;
 295 }
 296
 297 static int ves1820_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 298 {
 299         struct ves1820_state* state = fe->demodulator_priv;
 300
 301         *ucblocks = ves1820_readreg(state, 0x13) & 0x7f;
 302         if (*ucblocks == 0x7f)
 303                 *ucblocks = 0xffffffff;
 304
 305         /* reset uncorrected block counter */
 306         ves1820_writereg(state, 0x10, ves1820_inittab[0x10] & 0xdf);
 307         ves1820_writereg(state, 0x10, ves1820_inittab[0x10]);
 308
 309         return 0;
 310 }
 311
 312 static int ves1820_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 313 {
 314         struct ves1820_state* state = fe->demodulator_priv;
 315         int sync;
 316         s8 afc = 0;
 317
 318         sync = ves1820_readreg(state, 0x11);
 319         afc = ves1820_readreg(state, 0x19);
 320         if (verbose) {
 321                 /* AFC only valid when carrier has been recovered */
 322                 printk(sync & 2 ? "ves1820: AFC (%d) %dHz\n" :
 323                         "ves1820: [AFC (%d) %dHz]\n", afc, -((s32) p->u.qam.symbol_rate * afc) >> 10);
 324         }
 325
 326         if (!state->config->invert) {
 327                 p->inversion = (state->reg0 & 0x20) ? INVERSION_ON : INVERSION_OFF;
 328         } else {
 329                 p->inversion = (!(state->reg0 & 0x20)) ? INVERSION_ON : INVERSION_OFF;
 330         }
 331
 332         p->u.qam.modulation = ((state->reg0 >> 2) & 7) + QAM_16;
 333
 334         p->u.qam.fec_inner = FEC_NONE;
 335
 336         p->frequency = ((p->frequency + 31250) / 62500) * 62500;
 337         if (sync & 2)
 338                 p->frequency -= ((s32) p->u.qam.symbol_rate * afc) >> 10;
 339
 340         return 0;
 341 }
 342
 343 static int ves1820_sleep(struct dvb_frontend* fe)
 344 {
 345         struct ves1820_state* state = fe->demodulator_priv;
 346
 347         ves1820_writereg(state, 0x1b, 0x02);    /* pdown ADC */
 348         ves1820_writereg(state, 0x00, 0x80);    /* standby */
 349
 350         return 0;
 351 }
 352
 353 static int ves1820_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 354 {
 355
 356         fesettings->min_delay_ms = 200;
 357         fesettings->step_size = 0;
 358         fesettings->max_drift = 0;
 359         return 0;
 360 }
 361
 362 static void ves1820_release(struct dvb_frontend* fe)
 363 {
 364         struct ves1820_state* state = fe->demodulator_priv;
 365         kfree(state);
 366 }
 367
 368 static struct dvb_frontend_ops ves1820_ops;
 369
 370 struct dvb_frontend* ves1820_attach(const struct ves1820_config* config,
 371                                     struct i2c_adapter* i2c,
 372                                     u8 pwm)
 373 {
 374         struct ves1820_state* state = NULL;
 375
 376         /* allocate memory for the internal state */
 377         state = kzalloc(sizeof(struct ves1820_state), GFP_KERNEL);
 378         if (state == NULL)
 379                 goto error;
 380
 381         /* setup the state */
 382         state->reg0 = ves1820_inittab[0];
 383         state->config = config;
 384         state->i2c = i2c;
 385         state->pwm = pwm;
 386
 387         /* check if the demod is there */
 388         if ((ves1820_readreg(state, 0x1a) & 0xf0) != 0x70)
 389                 goto error;
 390
 391         if (verbose)
 392                 printk("ves1820: pwm=0x%02x\n", state->pwm);
 393
 394         /* create dvb_frontend */
 395         memcpy(&state->frontend.ops, &ves1820_ops, sizeof(struct dvb_frontend_ops));
 396         state->frontend.ops.info.symbol_rate_min = (state->config->xin / 2) / 64;      /* SACLK/64 == (XIN/2)/64 */
 397         state->frontend.ops.info.symbol_rate_max = (state->config->xin / 2) / 4;       /* SACLK/4 */
 398         state->frontend.demodulator_priv = state;
 399
 400         return &state->frontend;
 401
 402 error:
 403         kfree(state);
 404         return NULL;
 405 }
 406
 407 static struct dvb_frontend_ops ves1820_ops = {
 408
 409         .info = {
 410                 .name = "VLSI VES1820 DVB-C",
 411                 .type = FE_QAM,
 412                 .frequency_stepsize = 62500,
 413                 .frequency_min = 47000000,
 414                 .frequency_max = 862000000,
 415                 .caps = FE_CAN_QAM_16 |
 416                         FE_CAN_QAM_32 |
 417                         FE_CAN_QAM_64 |
 418                         FE_CAN_QAM_128 |
 419                         FE_CAN_QAM_256 |
 420                         FE_CAN_FEC_AUTO
 421         },
 422
 423         .release = ves1820_release,
 424
 425         .init = ves1820_init,
 426         .sleep = ves1820_sleep,
 427
 428         .set_frontend = ves1820_set_parameters,
 429         .get_frontend = ves1820_get_frontend,
 430         .get_tune_settings = ves1820_get_tune_settings,
 431
 432         .read_status = ves1820_read_status,
 433         .read_ber = ves1820_read_ber,
 434         .read_signal_strength = ves1820_read_signal_strength,
 435         .read_snr = ves1820_read_snr,
 436         .read_ucblocks = ves1820_read_ucblocks,
 437 };
 438
 439 module_param(verbose, int, 0644);
 440 MODULE_PARM_DESC(verbose, "print AFC offset after tuning for debugging the PWM setting");
 441
 442 MODULE_DESCRIPTION("VLSI VES1820 DVB-C Demodulator driver");
 443 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
 444 MODULE_LICENSE("GPL");
 445
 446 EXPORT_SYMBOL(ves1820_attach);