drivers/media/dvb/frontends/tda8083.c

   1 /*
   2     Driver for Philips TDA8083 based QPSK Demodulator
   3
   4     Copyright (C) 2001 Convergence Integrated Media GmbH
   5
   6     written by Ralph Metzler <ralph@convergence.de>
   7
   8     adoption to the new DVB frontend API and diagnostic ioctl's
   9     by Holger Waechtler <holger@convergence.de>
  10
  11     This program is free software; you can redistribute it and/or modify
  12     it under the terms of the GNU General Public License as published by
  13     the Free Software Foundation; either version 2 of the License, or
  14     (at your option) any later version.
  15
  16     This program is distributed in the hope that it will be useful,
  17     but WITHOUT ANY WARRANTY; without even the implied warranty of
  18     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19     GNU General Public License for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with this program; if not, write to the Free Software
  23     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 */
  26
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/string.h>
  32 #include <linux/slab.h>
  33 #include <linux/jiffies.h>
  34 #include "dvb_frontend.h"
  35 #include "tda8083.h"
  36
  37
  38 struct tda8083_state {
  39         struct i2c_adapter* i2c;
  40         struct dvb_frontend_ops ops;
  41         /* configuration settings */
  42         const struct tda8083_config* config;
  43         struct dvb_frontend frontend;
  44 };
  45
  46 static int debug;
  47 #define dprintk(args...) \
  48         do { \
  49                 if (debug) printk(KERN_DEBUG "tda8083: " args); \
  50         } while (0)
  51
  52
  53 static u8 tda8083_init_tab [] = {
  54         0x04, 0x00, 0x4a, 0x79, 0x04, 0x00, 0xff, 0xea,
  55         0x48, 0x42, 0x79, 0x60, 0x70, 0x52, 0x9a, 0x10,
  56         0x0e, 0x10, 0xf2, 0xa7, 0x93, 0x0b, 0x05, 0xc8,
  57         0x9d, 0x00, 0x42, 0x80, 0x00, 0x60, 0x40, 0x00,
  58         0x00, 0x75, 0x00, 0xe0, 0x00, 0x00, 0x00, 0x00,
  59         0x00, 0x00, 0x00, 0x00
  60 };
  61
  62
  63 static int tda8083_writereg (struct tda8083_state* state, u8 reg, u8 data)
  64 {
  65         int ret;
  66         u8 buf [] = { reg, data };
  67         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  68
  69         ret = i2c_transfer(state->i2c, &msg, 1);
  70
  71         if (ret != 1)
  72                 dprintk ("%s: writereg error (reg %02x, ret == %i)\n",
  73                         __FUNCTION__, reg, ret);
  74
  75         return (ret != 1) ? -1 : 0;
  76 }
  77
  78 static int tda8083_readregs (struct tda8083_state* state, u8 reg1, u8 *b, u8 len)
  79 {
  80         int ret;
  81         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = &reg1, .len = 1 },
  82                            { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };
  83
  84         ret = i2c_transfer(state->i2c, msg, 2);
  85
  86         if (ret != 2)
  87                 dprintk ("%s: readreg error (reg %02x, ret == %i)\n",
  88                         __FUNCTION__, reg1, ret);
  89
  90         return ret == 2 ? 0 : -1;
  91 }
  92
  93 static inline u8 tda8083_readreg (struct tda8083_state* state, u8 reg)
  94 {
  95         u8 val;
  96
  97         tda8083_readregs (state, reg, &val, 1);
  98
  99         return val;
 100 }
 101
 102 static int tda8083_set_inversion (struct tda8083_state* state, fe_spectral_inversion_t inversion)
 103 {
 104         /*  XXX FIXME: implement other modes than FEC_AUTO */
 105         if (inversion == INVERSION_AUTO)
 106                 return 0;
 107
 108         return -EINVAL;
 109 }
 110
 111 static int tda8083_set_fec (struct tda8083_state* state, fe_code_rate_t fec)
 112 {
 113         if (fec == FEC_AUTO)
 114                 return tda8083_writereg (state, 0x07, 0xff);
 115
 116         if (fec >= FEC_1_2 && fec <= FEC_8_9)
 117                 return tda8083_writereg (state, 0x07, 1 << (FEC_8_9 - fec));
 118
 119         return -EINVAL;
 120 }
 121
 122 static fe_code_rate_t tda8083_get_fec (struct tda8083_state* state)
 123 {
 124         u8 index;
 125         static fe_code_rate_t fec_tab [] = { FEC_8_9, FEC_1_2, FEC_2_3, FEC_3_4,
 126                                        FEC_4_5, FEC_5_6, FEC_6_7, FEC_7_8 };
 127
 128         index = tda8083_readreg(state, 0x0e) & 0x07;
 129
 130         return fec_tab [index];
 131 }
 132
 133 static int tda8083_set_symbolrate (struct tda8083_state* state, u32 srate)
 134 {
 135         u32 ratio;
 136         u32 tmp;
 137         u8 filter;
 138
 139         if (srate > 32000000)
 140                 srate = 32000000;
 141         if (srate < 500000)
 142                 srate = 500000;
 143
 144         filter = 0;
 145         if (srate < 24000000)
 146                 filter = 2;
 147         if (srate < 16000000)
 148                 filter = 3;
 149
 150         tmp = 31250 << 16;
 151         ratio = tmp / srate;
 152
 153         tmp = (tmp % srate) << 8;
 154         ratio = (ratio << 8) + tmp / srate;
 155
 156         tmp = (tmp % srate) << 8;
 157         ratio = (ratio << 8) + tmp / srate;
 158
 159         dprintk("tda8083: ratio == %08x\n", (unsigned int) ratio);
 160
 161         tda8083_writereg (state, 0x05, filter);
 162         tda8083_writereg (state, 0x02, (ratio >> 16) & 0xff);
 163         tda8083_writereg (state, 0x03, (ratio >>  8) & 0xff);
 164         tda8083_writereg (state, 0x04, (ratio      ) & 0xff);
 165
 166         tda8083_writereg (state, 0x00, 0x3c);
 167         tda8083_writereg (state, 0x00, 0x04);
 168
 169         return 1;
 170 }
 171
 172 static void tda8083_wait_diseqc_fifo (struct tda8083_state* state, int timeout)
 173 {
 174         unsigned long start = jiffies;
 175
 176         while (jiffies - start < timeout &&
 177                !(tda8083_readreg(state, 0x02) & 0x80))
 178         {
 179                 msleep(50);
 180         };
 181 }
 182
 183 static int tda8083_set_tone (struct tda8083_state* state, fe_sec_tone_mode_t tone)
 184 {
 185         tda8083_writereg (state, 0x26, 0xf1);
 186
 187         switch (tone) {
 188         case SEC_TONE_OFF:
 189                 return tda8083_writereg (state, 0x29, 0x00);
 190         case SEC_TONE_ON:
 191                 return tda8083_writereg (state, 0x29, 0x80);
 192         default:
 193                 return -EINVAL;
 194         };
 195 }
 196
 197 static int tda8083_set_voltage (struct tda8083_state* state, fe_sec_voltage_t voltage)
 198 {
 199         switch (voltage) {
 200         case SEC_VOLTAGE_13:
 201                 return tda8083_writereg (state, 0x20, 0x00);
 202         case SEC_VOLTAGE_18:
 203                 return tda8083_writereg (state, 0x20, 0x11);
 204         default:
 205                 return -EINVAL;
 206         };
 207 }
 208
 209 static int tda8083_send_diseqc_burst (struct tda8083_state* state, fe_sec_mini_cmd_t burst)
 210 {
 211         switch (burst) {
 212         case SEC_MINI_A:
 213                 tda8083_writereg (state, 0x29, (5 << 2));  /* send burst A */
 214                 break;
 215         case SEC_MINI_B:
 216                 tda8083_writereg (state, 0x29, (7 << 2));  /* send B */
 217                 break;
 218         default:
 219                 return -EINVAL;
 220         };
 221
 222         tda8083_wait_diseqc_fifo (state, 100);
 223
 224         return 0;
 225 }
 226
 227 static int tda8083_send_diseqc_msg (struct dvb_frontend* fe,
 228                                     struct dvb_diseqc_master_cmd *m)
 229 {
 230         struct tda8083_state* state = fe->demodulator_priv;
 231         int i;
 232
 233         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (1 << 2)); /* enable */
 234
 235         for (i=0; i<m->msg_len; i++)
 236                 tda8083_writereg (state, 0x23 + i, m->msg[i]);
 237
 238         tda8083_writereg (state, 0x29, (m->msg_len - 3) | (3 << 2)); /* send!! */
 239
 240         tda8083_wait_diseqc_fifo (state, 100);
 241
 242         return 0;
 243 }
 244
 245 static int tda8083_read_status(struct dvb_frontend* fe, fe_status_t* status)
 246 {
 247         struct tda8083_state* state = fe->demodulator_priv;
 248
 249         u8 signal = ~tda8083_readreg (state, 0x01);
 250         u8 sync = tda8083_readreg (state, 0x02);
 251
 252         *status = 0;
 253
 254         if (signal > 10)
 255                 *status |= FE_HAS_SIGNAL;
 256
 257         if (sync & 0x01)
 258                 *status |= FE_HAS_CARRIER;
 259
 260         if (sync & 0x02)
 261                 *status |= FE_HAS_VITERBI;
 262
 263         if (sync & 0x10)
 264                 *status |= FE_HAS_SYNC;
 265
 266         if ((sync & 0x1f) == 0x1f)
 267                 *status |= FE_HAS_LOCK;
 268
 269         return 0;
 270 }
 271
 272 static int tda8083_read_signal_strength(struct dvb_frontend* fe, u16* strength)
 273 {
 274         struct tda8083_state* state = fe->demodulator_priv;
 275
 276         u8 signal = ~tda8083_readreg (state, 0x01);
 277         *strength = (signal << 8) | signal;
 278
 279         return 0;
 280 }
 281
 282 static int tda8083_read_snr(struct dvb_frontend* fe, u16* snr)
 283 {
 284         struct tda8083_state* state = fe->demodulator_priv;
 285
 286         u8 _snr = tda8083_readreg (state, 0x08);
 287         *snr = (_snr << 8) | _snr;
 288
 289         return 0;
 290 }
 291
 292 static int tda8083_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 293 {
 294         struct tda8083_state* state = fe->demodulator_priv;
 295
 296         state->config->pll_set(fe, p);
 297         tda8083_set_inversion (state, p->inversion);
 298         tda8083_set_fec (state, p->u.qpsk.fec_inner);
 299         tda8083_set_symbolrate (state, p->u.qpsk.symbol_rate);
 300
 301         tda8083_writereg (state, 0x00, 0x3c);
 302         tda8083_writereg (state, 0x00, 0x04);
 303
 304         return 0;
 305 }
 306
 307 static int tda8083_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 308 {
 309         struct tda8083_state* state = fe->demodulator_priv;
 310
 311         /*  FIXME: get symbolrate & frequency offset...*/
 312         /*p->frequency = ???;*/
 313         p->inversion = (tda8083_readreg (state, 0x0e) & 0x80) ?
 314                         INVERSION_ON : INVERSION_OFF;
 315         p->u.qpsk.fec_inner = tda8083_get_fec (state);
 316         /*p->u.qpsk.symbol_rate = tda8083_get_symbolrate (state);*/
 317
 318         return 0;
 319 }
 320
 321 static int tda8083_sleep(struct dvb_frontend* fe)
 322 {
 323         struct tda8083_state* state = fe->demodulator_priv;
 324
 325         tda8083_writereg (state, 0x00, 0x02);
 326         return 0;
 327 }
 328
 329 static int tda8083_init(struct dvb_frontend* fe)
 330 {
 331         struct tda8083_state* state = fe->demodulator_priv;
 332         int i;
 333
 334         for (i=0; i<44; i++)
 335                 tda8083_writereg (state, i, tda8083_init_tab[i]);
 336
 337         if (state->config->pll_init) state->config->pll_init(fe);
 338
 339         tda8083_writereg (state, 0x00, 0x3c);
 340         tda8083_writereg (state, 0x00, 0x04);
 341
 342         return 0;
 343 }
 344
 345 static int tda8083_diseqc_send_burst(struct dvb_frontend* fe, fe_sec_mini_cmd_t burst)
 346 {
 347         struct tda8083_state* state = fe->demodulator_priv;
 348
 349         tda8083_send_diseqc_burst (state, burst);
 350         tda8083_writereg (state, 0x00, 0x3c);
 351         tda8083_writereg (state, 0x00, 0x04);
 352
 353         return 0;
 354 }
 355
 356 static int tda8083_diseqc_set_tone(struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 357 {
 358         struct tda8083_state* state = fe->demodulator_priv;
 359
 360         tda8083_set_tone (state, tone);
 361         tda8083_writereg (state, 0x00, 0x3c);
 362         tda8083_writereg (state, 0x00, 0x04);
 363
 364         return 0;
 365 }
 366
 367 static int tda8083_diseqc_set_voltage(struct dvb_frontend* fe, fe_sec_voltage_t voltage)
 368 {
 369         struct tda8083_state* state = fe->demodulator_priv;
 370
 371         tda8083_set_voltage (state, voltage);
 372         tda8083_writereg (state, 0x00, 0x3c);
 373         tda8083_writereg (state, 0x00, 0x04);
 374
 375         return 0;
 376 }
 377
 378 static void tda8083_release(struct dvb_frontend* fe)
 379 {
 380         struct tda8083_state* state = fe->demodulator_priv;
 381         kfree(state);
 382 }
 383
 384 static struct dvb_frontend_ops tda8083_ops;
 385
 386 struct dvb_frontend* tda8083_attach(const struct tda8083_config* config,
 387                                     struct i2c_adapter* i2c)
 388 {
 389         struct tda8083_state* state = NULL;
 390
 391         /* allocate memory for the internal state */
 392         state = kmalloc(sizeof(struct tda8083_state), GFP_KERNEL);
 393         if (state == NULL) goto error;
 394
 395         /* setup the state */
 396         state->config = config;
 397         state->i2c = i2c;
 398         memcpy(&state->ops, &tda8083_ops, sizeof(struct dvb_frontend_ops));
 399
 400         /* check if the demod is there */
 401         if ((tda8083_readreg(state, 0x00)) != 0x05) goto error;
 402
 403         /* create dvb_frontend */
 404         state->frontend.ops = &state->ops;
 405         state->frontend.demodulator_priv = state;
 406         return &state->frontend;
 407
 408 error:
 409         kfree(state);
 410         return NULL;
 411 }
 412
 413 static struct dvb_frontend_ops tda8083_ops = {
 414
 415         .info = {
 416                 .name                   = "Philips TDA8083 DVB-S",
 417                 .type                   = FE_QPSK,
 418                 .frequency_min          = 950000,     /* FIXME: guessed! */
 419                 .frequency_max          = 1400000,    /* FIXME: guessed! */
 420                 .frequency_stepsize     = 125,   /* kHz for QPSK frontends */
 421         /*      .frequency_tolerance    = ???,*/
 422                 .symbol_rate_min        = 1000000,   /* FIXME: guessed! */
 423                 .symbol_rate_max        = 45000000,  /* FIXME: guessed! */
 424         /*      .symbol_rate_tolerance  = ???,*/
 425                 .caps = FE_CAN_INVERSION_AUTO |
 426                         FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 427                         FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
 428                         FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
 429                         FE_CAN_QPSK | FE_CAN_MUTE_TS
 430         },
 431
 432         .release = tda8083_release,
 433
 434         .init = tda8083_init,
 435         .sleep = tda8083_sleep,
 436
 437         .set_frontend = tda8083_set_frontend,
 438         .get_frontend = tda8083_get_frontend,
 439
 440         .read_status = tda8083_read_status,
 441         .read_signal_strength = tda8083_read_signal_strength,
 442         .read_snr = tda8083_read_snr,
 443
 444         .diseqc_send_master_cmd = tda8083_send_diseqc_msg,
 445         .diseqc_send_burst = tda8083_diseqc_send_burst,
 446         .set_tone = tda8083_diseqc_set_tone,
 447         .set_voltage = tda8083_diseqc_set_voltage,
 448 };
 449
 450 module_param(debug, int, 0644);
 451 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 452
 453 MODULE_DESCRIPTION("Philips TDA8083 DVB-S Demodulator");
 454 MODULE_AUTHOR("Ralph Metzler, Holger Waechtler");
 455 MODULE_LICENSE("GPL");
 456
 457 EXPORT_SYMBOL(tda8083_attach);