drivers/media/dvb-frontends/tda8083.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     Driver for Philips TDA8083 based QPSK Demodulator
   4
   5     Copyright (C) 2001 Convergence Integrated Media GmbH
   6
   7     written by Ralph Metzler <ralph@convergence.de>
   8
   9     adoption to the new DVB frontend API and diagnostic ioctl's
  10     by Holger Waechtler <holger@convergence.de>
  11
  12
  13 */
  14
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/string.h>
  19 #include <linux/slab.h>
  20 #include <linux/jiffies.h>
  21 #include <media/dvb_frontend.h>
  22 #include "tda8083.h"
  23
  24
  25 struct tda8083_state {
  26         struct i2c_adapter* i2c;
  27         /* configuration settings */
  28         const struct tda8083_config* config;
  29         struct dvb_frontend frontend;
  30 };
  31
  32 static int debug;
  33 #define dprintk(args...) \
  34         do { \
  35                 if (debug) printk(KERN_DEBUG "tda8083: " args); \
  36         } while (0)
  37
  38
  39 static u8 tda8083_init_tab [] = {
  40         0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
  41         0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
  42         0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
  43         0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
  44         0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
  45         0x00, 0x00, 0x00, 0x00
  46 };
  47
  48
  49 static int tda8083_writereg (struct tda8083_state* state, u8 reg, u8 data)
  50 {
  51         int ret;
  52         u8 buf [] = { reg, data };
  53         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  54
  55         ret = i2c_transfer(state->i2c, &msg, 1);
  56
  57         if (ret != 1)
  58                 dprintk ("%s: writereg error (reg %02x, ret == %i)\n",
  59                         __func__, reg, ret);
  60
  61         return (ret != 1) ? -1 : 0;
  62 }
  63
  64 static int tda8083_readregs (struct tda8083_state* state, u8 reg1, u8 *b, u8 len)
  65 {
  66         int ret;
  67         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg1, .len = 1 },
  68                            { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };
  69
  70         ret = i2c_transfer(state->i2c, msg, 2);
  71
  72         if (ret != 2)
  73                 dprintk ("%s: readreg error (reg %02x, ret == %i)\n",
  74                         __func__, reg1, ret);
  75
  76         return ret == 2 ? 0 : -1;
  77 }
  78
  79 static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
  80 {
  81         u8 val;
  82
  83         tda8083_readregs (state, reg, &val, 1);
  84
  85         return val;
  86 }
  87
  88 static int tda8083_set_inversion(struct tda8083_state *state,
  89                                  enum fe_spectral_inversion inversion)
  90 {
  91         /*  XXX FIXME: implement other modes than FEC_AUTO */
  92         if (inversion == INVERSION_AUTO)
  93                 return 0;
  94
  95         return -EINVAL;
  96 }
  97
  98 static int tda8083_set_fec(struct tda8083_state *state, enum fe_code_rate fec)
  99 {
 100         if (fec == FEC_AUTO)
 101                 return tda8083_writereg (state, 0x07, 0xff);
 102
 103         if (fec >= FEC_1_2 && fec <= FEC_8_9)
 104                 return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));
 105
 106         return -EINVAL;
 107 }
 108
 109 static enum fe_code_rate tda8083_get_fec(struct tda8083_state *state)
 110 {
 111         u8 index;
 112         static enum fe_code_rate fec_tab[] = {
 113                 FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
 114                 FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8
 115         };
 116
 117         index = tda8083_readreg(state, 0x0e) & 0x07;
 118
 119         return fec_tab [index];
 120 }
 121
 122 static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
 123 {
 124         u32 ratio;
 125         u32 tmp;
 126         u8 filter;
 127
 128         if (srate > 32000000)
 129                 srate = 32000000;
 130         if (srate < 500000)
 131                 srate = 500000;
 132
 133         filter = 0;
 134         if (srate < 24000000)
 135                 filter = 2;
 136         if (srate < 16000000)
 137                 filter = 3;
 138
 139         tmp = 31250 << 16;
 140         ratio = tmp / srate;
 141
 142         tmp = (tmp % srate) << 8;
 143         ratio = (ratio << 8) + tmp / srate;
 144
 145         tmp = (tmp % srate) << 8;
 146         ratio = (ratio << 8) + tmp / srate;
 147
 148         dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);
 149
 150         tda8083_writereg (state, 0x05, filter);
 151         tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
 152         tda8083_writereg (state, 0x03, (ratio >>  8) & 0xff);
 153         tda8083_writereg (state, 0x04, (ratio      ) & 0xff);
 154
 155         tda8083_writereg (state, 0x00, 0x3c);
 156         tda8083_writereg (state, 0x00, 0x04);
 157
 158         return 1;
 159 }
 160
 161 static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
 162 {
 163         unsigned long start = jiffies;
 164
 165         while (jiffies - start < timeout &&
 166                !(tda8083_readreg(state, 0x02) & 0x80))
 167         {
 168                 msleep(50);
 169         }
 170 }
 171
 172 static int tda8083_set_tone(struct tda8083_state *state,
 173                             enum fe_sec_tone_mode tone)
 174 {
 175         tda8083_writereg (state, 0x26, 0xf1);
 176
 177         switch (tone) {
 178         case SEC_TONE_OFF:
 179                 return tda8083_writereg (state, 0x29, 0x00);
 180         case SEC_TONE_ON:
 181                 return tda8083_writereg (state, 0x29, 0x80);
 182         default:
 183                 return -EINVAL;
 184         }
 185 }
 186
 187 static int tda8083_set_voltage(struct tda8083_state *state,
 188                                enum fe_sec_voltage voltage)
 189 {
 190         switch (voltage) {
 191         case SEC_VOLTAGE_13:
 192                 return tda8083_writereg (state, 0x20, 0x00);
 193         case SEC_VOLTAGE_18:
 194                 return tda8083_writereg (state, 0x20, 0x11);
 195         default:
 196                 return -EINVAL;
 197         }
 198 }
 199
 200 static int tda8083_send_diseqc_burst(struct tda8083_state *state,
 201                                      enum fe_sec_mini_cmd burst)
 202 {
 203         switch (burst) {
 204         case SEC_MINI_A:
 205                 tda8083_writereg (state, 0x29, (5 << 2));  /* send burst A */
 206                 break;
 207         case SEC_MINI_B:
 208                 tda8083_writereg (state, 0x29, (7 << 2));  /* send B */
 209                 break;
 210         default:
 211                 return -EINVAL;
 212         }
 213
 214         tda8083_wait_diseqc_fifo (state, 100);
 215
 216         return 0;
 217 }
 218
 219 static int tda8083_send_diseqc_msg(struct dvb_frontend *fe,
 220                                    struct dvb_diseqc_master_cmd *m)
 221 {
 222         struct tda8083_state* state = fe->demodulator_priv;
 223         int i;
 224
 225         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (1 << 2)); /* enable */
 226
 227         for (i=0; i<m->msg_len; i++)
 228                 tda8083_writereg (state, 0x23 + i, m->msg[i]);
 229
 230         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (3 << 2)); /* send!! */
 231
 232         tda8083_wait_diseqc_fifo (state, 100);
 233
 234         return 0;
 235 }
 236
 237 static int tda8083_read_status(struct dvb_frontend *fe,
 238                                enum fe_status *status)
 239 {
 240         struct tda8083_state* state = fe->demodulator_priv;
 241
 242         u8 signal = ~tda8083_readreg (state, 0x01);
 243         u8 sync = tda8083_readreg (state, 0x02);
 244
 245         *status = 0;
 246
 247         if (signal > 10)
 248                 *status |= FE_HAS_SIGNAL;
 249
 250         if (sync & 0x01)
 251                 *status |= FE_HAS_CARRIER;
 252
 253         if (sync & 0x02)
 254                 *status |= FE_HAS_VITERBI;
 255
 256         if (sync & 0x10)
 257                 *status |= FE_HAS_SYNC;
 258
 259         if (sync & 0x20) /* frontend can not lock */
 260                 *status |= FE_TIMEDOUT;
 261
 262         if ((sync & 0x1f) == 0x1f)
 263                 *status |= FE_HAS_LOCK;
 264
 265         return 0;
 266 }
 267
 268 static int tda8083_read_ber(struct dvb_frontend* fe, u32* ber)
 269 {
 270         struct tda8083_state* state = fe->demodulator_priv;
 271         int ret;
 272         u8 buf[3];
 273
 274         if ((ret = tda8083_readregs(state, 0x0b, buf, sizeof(buf))))
 275                 return ret;
 276
 277         *ber = ((buf[0] & 0x1f) << 16) | (buf[1] << 8) | buf[2];
 278
 279         return 0;
 280 }
 281
 282 static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 283 {
 284         struct tda8083_state* state = fe->demodulator_priv;
 285
 286         u8 signal = ~tda8083_readreg (state, 0x01);
 287         *strength = (signal << 8) | signal;
 288
 289         return 0;
 290 }
 291
 292 static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
 293 {
 294         struct tda8083_state* state = fe->demodulator_priv;
 295
 296         u8 _snr = tda8083_readreg (state, 0x08);
 297         *snr = (_snr << 8) | _snr;
 298
 299         return 0;
 300 }
 301
 302 static int tda8083_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 303 {
 304         struct tda8083_state* state = fe->demodulator_priv;
 305
 306         *ucblocks = tda8083_readreg(state, 0x0f);
 307         if (*ucblocks == 0xff)
 308                 *ucblocks = 0xffffffff;
 309
 310         return 0;
 311 }
 312
 313 static int tda8083_set_frontend(struct dvb_frontend *fe)
 314 {
 315         struct dtv_frontend_properties *p = &fe->dtv_property_cache;
 316         struct tda8083_state* state = fe->demodulator_priv;
 317
 318         if (fe->ops.tuner_ops.set_params) {
 319                 fe->ops.tuner_ops.set_params(fe);
 320                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 321         }
 322
 323         tda8083_set_inversion (state, p->inversion);
 324         tda8083_set_fec(state, p->fec_inner);
 325         tda8083_set_symbolrate(state, p->symbol_rate);
 326
 327         tda8083_writereg (state, 0x00, 0x3c);
 328         tda8083_writereg (state, 0x00, 0x04);
 329
 330         return 0;
 331 }
 332
 333 static int tda8083_get_frontend(struct dvb_frontend *fe,
 334                                 struct dtv_frontend_properties *p)
 335 {
 336         struct tda8083_state* state = fe->demodulator_priv;
 337
 338         /*  FIXME: get symbolrate & frequency offset...*/
 339         /*p->frequency = ???;*/
 340         p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
 341                         INVERSION_ON : INVERSION_OFF;
 342         p->fec_inner = tda8083_get_fec(state);
 343         /*p->symbol_rate = tda8083_get_symbolrate (state);*/
 344
 345         return 0;
 346 }
 347
 348 static int tda8083_sleep(struct dvb_frontend* fe)
 349 {
 350         struct tda8083_state* state = fe->demodulator_priv;
 351
 352         tda8083_writereg (state, 0x00, 0x02);
 353         return 0;
 354 }
 355
 356 static int tda8083_init(struct dvb_frontend* fe)
 357 {
 358         struct tda8083_state* state = fe->demodulator_priv;
 359         int i;
 360
 361         for (i=0; i<44; i++)
 362                 tda8083_writereg (state, i, tda8083_init_tab[i]);
 363
 364         tda8083_writereg (state, 0x00, 0x3c);
 365         tda8083_writereg (state, 0x00, 0x04);
 366
 367         return 0;
 368 }
 369
 370 static int tda8083_diseqc_send_burst(struct dvb_frontend *fe,
 371                                      enum fe_sec_mini_cmd burst)
 372 {
 373         struct tda8083_state* state = fe->demodulator_priv;
 374
 375         tda8083_send_diseqc_burst (state, burst);
 376         tda8083_writereg (state, 0x00, 0x3c);
 377         tda8083_writereg (state, 0x00, 0x04);
 378
 379         return 0;
 380 }
 381
 382 static int tda8083_diseqc_set_tone(struct dvb_frontend *fe,
 383                                    enum fe_sec_tone_mode tone)
 384 {
 385         struct tda8083_state* state = fe->demodulator_priv;
 386
 387         tda8083_set_tone (state, tone);
 388         tda8083_writereg (state, 0x00, 0x3c);
 389         tda8083_writereg (state, 0x00, 0x04);
 390
 391         return 0;
 392 }
 393
 394 static int tda8083_diseqc_set_voltage(struct dvb_frontend *fe,
 395                                       enum fe_sec_voltage voltage)
 396 {
 397         struct tda8083_state* state = fe->demodulator_priv;
 398
 399         tda8083_set_voltage (state, voltage);
 400         tda8083_writereg (state, 0x00, 0x3c);
 401         tda8083_writereg (state, 0x00, 0x04);
 402
 403         return 0;
 404 }
 405
 406 static void tda8083_release(struct dvb_frontend* fe)
 407 {
 408         struct tda8083_state* state = fe->demodulator_priv;
 409         kfree(state);
 410 }
 411
 412 static const struct dvb_frontend_ops tda8083_ops;
 413
 414 struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
 415                                     struct i2c_adapter* i2c)
 416 {
 417         struct tda8083_state* state = NULL;
 418
 419         /* allocate memory for the internal state */
 420         state = kzalloc(sizeof(struct tda8083_state), GFP_KERNEL);
 421         if (state == NULL) goto error;
 422
 423         /* setup the state */
 424         state->config = config;
 425         state->i2c = i2c;
 426
 427         /* check if the demod is there */
 428         if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;
 429
 430         /* create dvb_frontend */
 431         memcpy(&state->frontend.ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
 432         state->frontend.demodulator_priv = state;
 433         return &state->frontend;
 434
 435 error:
 436         kfree(state);
 437         return NULL;
 438 }
 439
 440 static const struct dvb_frontend_ops tda8083_ops = {
 441         .delsys = { SYS_DVBS },
 442         .info = {
 443                 .name                   = "Philips TDA8083 DVB-S",
 444                 .frequency_min_hz       =  920 * MHz,     /* TDA8060 */
 445                 .frequency_max_hz       = 2200 * MHz,    /* TDA8060 */
 446                 .frequency_stepsize_hz  =  125 * kHz,
 447                 .symbol_rate_min        = 12000000,
 448                 .symbol_rate_max        = 30000000,
 449         /*      .symbol_rate_tolerance  = ???,*/
 450                 .caps = FE_CAN_INVERSION_AUTO |
 451                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 452                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 453                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 454                         FE_CAN_QPSK | FE_CAN_MUTE_TS
 455         },
 456
 457         .release = tda8083_release,
 458
 459         .init = tda8083_init,
 460         .sleep = tda8083_sleep,
 461
 462         .set_frontend = tda8083_set_frontend,
 463         .get_frontend = tda8083_get_frontend,
 464
 465         .read_status = tda8083_read_status,
 466         .read_signal_strength = tda8083_read_signal_strength,
 467         .read_snr = tda8083_read_snr,
 468         .read_ber = tda8083_read_ber,
 469         .read_ucblocks = tda8083_read_ucblocks,
 470
 471         .diseqc_send_master_cmd = tda8083_send_diseqc_msg,
 472         .diseqc_send_burst = tda8083_diseqc_send_burst,
 473         .set_tone = tda8083_diseqc_set_tone,
 474         .set_voltage = tda8083_diseqc_set_voltage,
 475 };
 476
 477 module_param(debug, int, 0644);
 478 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 479
 480 MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
 481 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
 482 MODULE_LICENSE("GPL");
 483
 484 EXPORT_SYMBOL(tda8083_attach);