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   1 /*
   2     Auvitek AU8522 QAM/8VSB demodulator driver
   3
   4     Copyright (C) 2008 Steven Toth <stoth@hauppauge.com>
   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
  22 #include <linux/kernel.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/string.h>
  26 #include <linux/slab.h>
  27 #include <linux/delay.h>
  28 #include "dvb_frontend.h"
  29 #include "dvb-pll.h"
  30 #include "au8522.h"
  31
  32 struct au8522_state {
  33
  34         struct i2c_adapter *i2c;
  35
  36         /* configuration settings */
  37         const struct au8522_config *config;
  38
  39         struct dvb_frontend frontend;
  40
  41         u32 current_frequency;
  42         fe_modulation_t current_modulation;
  43
  44 };
  45
  46 static int debug = 0;
  47 #define dprintk if (debug) printk
  48
  49 /* 16 bit registers, 8 bit values */
  50 static int au8522_writereg(struct au8522_state *state, u16 reg, u8 data)
  51 {
  52         int ret;
  53         u8 buf [] = { reg >> 8, reg & 0xff, data };
  54
  55         struct i2c_msg msg = { .addr = state->config->demod_address,
  56                                .flags = 0, .buf = buf, .len = 3 };
  57
  58         ret = i2c_transfer(state->i2c, &msg, 1);
  59
  60         if (ret != 1)
  61                 printk("%s: writereg error (reg == 0x%02x, val == 0x%04x, "
  62                        "ret == %i)\n", __FUNCTION__, reg, data, ret);
  63
  64         return (ret != 1) ? -1 : 0;
  65 }
  66
  67 static u8 au8522_readreg(struct au8522_state *state, u16 reg)
  68 {
  69         int ret;
  70         u8 b0 [] = { reg >> 8, reg & 0xff };
  71         u8 b1 [] = { 0 };
  72
  73         struct i2c_msg msg [] = {
  74                 { .addr = state->config->demod_address, .flags = 0,
  75                   .buf = b0, .len = 2 },
  76                 { .addr = state->config->demod_address, .flags = I2C_M_RD,
  77                   .buf = b1, .len = 1 } };
  78
  79         ret = i2c_transfer(state->i2c, msg, 2);
  80
  81         if (ret != 2)
  82                 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
  83         return b1[0];
  84 }
  85
  86 static int au8522_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
  87 {
  88         struct au8522_state *state = fe->demodulator_priv;
  89
  90         dprintk("%s(%d)\n", __FUNCTION__, enable);
  91
  92         if (enable)
  93                 return au8522_writereg(state, 0x106, 1);
  94         else
  95                 return au8522_writereg(state, 0x106, 0);
  96 }
  97
  98 static int au8522_enable_modulation(struct dvb_frontend *fe,
  99                                     fe_modulation_t m)
 100 {
 101         struct au8522_state *state = fe->demodulator_priv;
 102
 103         dprintk("%s(0x%08x)\n", __FUNCTION__, m);
 104
 105         switch(m) {
 106         case VSB_8:
 107                 dprintk("%s() VSB_8\n", __FUNCTION__);
 108
 109                 //au8522_writereg(state, 0x410b, 0x84); // Serial
 110
 111                 //au8522_writereg(state, 0x8090, 0x82);
 112                 au8522_writereg(state, 0x8090, 0x84);
 113                 au8522_writereg(state, 0x4092, 0x11);
 114                 au8522_writereg(state, 0x2005, 0x00);
 115                 au8522_writereg(state, 0x8091, 0x80);
 116
 117                 au8522_writereg(state, 0x80a3, 0x0c);
 118                 au8522_writereg(state, 0x80a4, 0xe8);
 119                 au8522_writereg(state, 0x8081, 0xc4);
 120                 au8522_writereg(state, 0x80a5, 0x40);
 121                 au8522_writereg(state, 0x80a7, 0x40);
 122                 au8522_writereg(state, 0x80a6, 0x67);
 123                 au8522_writereg(state, 0x8262, 0x20);
 124                 au8522_writereg(state, 0x821c, 0x30);
 125                 au8522_writereg(state, 0x80d8, 0x1a);
 126                 au8522_writereg(state, 0x8227, 0xa0);
 127                 au8522_writereg(state, 0x8121, 0xff);
 128                 au8522_writereg(state, 0x80a8, 0xf0);
 129                 au8522_writereg(state, 0x80a9, 0x05);
 130                 au8522_writereg(state, 0x80aa, 0x77);
 131                 au8522_writereg(state, 0x80ab, 0xf0);
 132                 au8522_writereg(state, 0x80ac, 0x05);
 133                 au8522_writereg(state, 0x80ad, 0x77);
 134                 au8522_writereg(state, 0x80ae, 0x41);
 135                 au8522_writereg(state, 0x80af, 0x66);
 136                 au8522_writereg(state, 0x821b, 0xcc);
 137                 au8522_writereg(state, 0x821d, 0x80);
 138                 au8522_writereg(state, 0x80b5, 0xfb);
 139                 au8522_writereg(state, 0x80b6, 0x8e);
 140                 au8522_writereg(state, 0x80b7, 0x39);
 141                 au8522_writereg(state, 0x80a4, 0xe8);
 142                 au8522_writereg(state, 0x8231, 0x13);
 143                 break;
 144         case QAM_64:
 145         case QAM_256:
 146                 au8522_writereg(state, 0x80a3, 0x09);
 147                 au8522_writereg(state, 0x80a4, 0x00);
 148                 au8522_writereg(state, 0x8081, 0xc4);
 149                 au8522_writereg(state, 0x80a5, 0x40);
 150                 au8522_writereg(state, 0x80b5, 0xfb);
 151                 au8522_writereg(state, 0x80b6, 0x8e);
 152                 au8522_writereg(state, 0x80b7, 0x39);
 153                 au8522_writereg(state, 0x80aa, 0x77);
 154                 au8522_writereg(state, 0x80ad, 0x77);
 155                 au8522_writereg(state, 0x80a6, 0x67);
 156                 au8522_writereg(state, 0x8262, 0x20);
 157                 au8522_writereg(state, 0x821c, 0x30);
 158                 au8522_writereg(state, 0x80b8, 0x3e);
 159                 au8522_writereg(state, 0x80b9, 0xf0);
 160                 au8522_writereg(state, 0x80ba, 0x01);
 161                 au8522_writereg(state, 0x80bb, 0x18);
 162                 au8522_writereg(state, 0x80bc, 0x50);
 163                 au8522_writereg(state, 0x80bd, 0x00);
 164                 au8522_writereg(state, 0x80be, 0xea);
 165                 au8522_writereg(state, 0x80bf, 0xef);
 166                 au8522_writereg(state, 0x80c0, 0xfc);
 167                 au8522_writereg(state, 0x80c1, 0xbd);
 168                 au8522_writereg(state, 0x80c2, 0x1f);
 169                 au8522_writereg(state, 0x80c3, 0xfc);
 170                 au8522_writereg(state, 0x80c4, 0xdd);
 171                 au8522_writereg(state, 0x80c5, 0xaf);
 172                 au8522_writereg(state, 0x80c6, 0x00);
 173                 au8522_writereg(state, 0x80c7, 0x38);
 174                 au8522_writereg(state, 0x80c8, 0x30);
 175                 au8522_writereg(state, 0x80c9, 0x05);
 176                 au8522_writereg(state, 0x80ca, 0x4a);
 177                 au8522_writereg(state, 0x80cb, 0xd0);
 178                 au8522_writereg(state, 0x80cc, 0x01);
 179                 au8522_writereg(state, 0x80cd, 0xd9);
 180                 au8522_writereg(state, 0x80ce, 0x6f);
 181                 au8522_writereg(state, 0x80cf, 0xf9);
 182                 au8522_writereg(state, 0x80d0, 0x70);
 183                 au8522_writereg(state, 0x80d1, 0xdf);
 184                 au8522_writereg(state, 0x80d2, 0xf7);
 185                 au8522_writereg(state, 0x80d3, 0xc2);
 186                 au8522_writereg(state, 0x80d4, 0xdf);
 187                 au8522_writereg(state, 0x80d5, 0x02);
 188                 au8522_writereg(state, 0x80d6, 0x9a);
 189                 au8522_writereg(state, 0x80d7, 0xd0);
 190                 au8522_writereg(state, 0x8250, 0x0d);
 191                 au8522_writereg(state, 0x8251, 0xcd);
 192                 au8522_writereg(state, 0x8252, 0xe0);
 193                 au8522_writereg(state, 0x8253, 0x05);
 194                 au8522_writereg(state, 0x8254, 0xa7);
 195                 au8522_writereg(state, 0x8255, 0xff);
 196                 au8522_writereg(state, 0x8256, 0xed);
 197                 au8522_writereg(state, 0x8257, 0x5b);
 198                 au8522_writereg(state, 0x8258, 0xae);
 199                 au8522_writereg(state, 0x8259, 0xe6);
 200                 au8522_writereg(state, 0x825a, 0x3d);
 201                 au8522_writereg(state, 0x825b, 0x0f);
 202                 au8522_writereg(state, 0x825c, 0x0d);
 203                 au8522_writereg(state, 0x825d, 0xea);
 204                 au8522_writereg(state, 0x825e, 0xf2);
 205                 au8522_writereg(state, 0x825f, 0x51);
 206                 au8522_writereg(state, 0x8260, 0xf5);
 207                 au8522_writereg(state, 0x8261, 0x06);
 208                 au8522_writereg(state, 0x821a, 0x00);
 209                 au8522_writereg(state, 0x8546, 0x40);
 210                 au8522_writereg(state, 0x8210, 0x26);
 211                 au8522_writereg(state, 0x8211, 0xf6);
 212                 au8522_writereg(state, 0x8212, 0x84);
 213                 au8522_writereg(state, 0x8213, 0x02);
 214                 au8522_writereg(state, 0x8502, 0x01);
 215                 au8522_writereg(state, 0x8121, 0x04);
 216                 au8522_writereg(state, 0x8122, 0x04);
 217                 au8522_writereg(state, 0x852e, 0x10);
 218                 au8522_writereg(state, 0x80a4, 0xca);
 219                 au8522_writereg(state, 0x80a7, 0x40);
 220                 au8522_writereg(state, 0x8526, 0x01);
 221                 break;
 222         default:
 223                 dprintk("%s() Invalid modulation\n", __FUNCTION__);
 224                 return -EINVAL;
 225         }
 226
 227         state->current_modulation = m;
 228
 229         return 0;
 230 }
 231
 232 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
 233 static int au8522_set_frontend(struct dvb_frontend *fe,
 234                                struct dvb_frontend_parameters *p)
 235 {
 236         struct au8522_state *state = fe->demodulator_priv;
 237
 238         dprintk("%s(frequency=%d)\n", __FUNCTION__, p->frequency);
 239
 240         state->current_frequency = p->frequency;
 241
 242         au8522_enable_modulation(fe, p->u.vsb.modulation);
 243
 244         /* Allow the demod to settle */
 245         msleep(100);
 246
 247         if (fe->ops.tuner_ops.set_params) {
 248                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 1);
 249                 fe->ops.tuner_ops.set_params(fe, p);
 250                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 251         }
 252
 253         return 0;
 254 }
 255
 256 /* Reset the demod hardware and reset all of the configuration registers
 257    to a default state. */
 258 static int au8522_init(struct dvb_frontend *fe)
 259 {
 260         struct au8522_state *state = fe->demodulator_priv;
 261         dprintk("%s()\n", __FUNCTION__);
 262
 263         au8522_writereg(state, 0xa4, 1 << 5);
 264
 265         au8522_i2c_gate_ctrl(fe, 1);
 266
 267         return 0;
 268 }
 269
 270 static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
 271 {
 272         struct au8522_state *state = fe->demodulator_priv;
 273         u8 reg;
 274         u32 tuner_status = 0;
 275
 276         *status = 0;
 277
 278         if (state->current_modulation == VSB_8) {
 279                 dprintk("%s() Checking VSB_8\n", __FUNCTION__);
 280                 //au8522_writereg(state, 0x80a4, 0x20);
 281                 reg = au8522_readreg(state, 0x4088);
 282                 if (reg & 0x01)
 283                         *status |= FE_HAS_VITERBI;
 284                 if (reg & 0x02)
 285                         *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 286         } else {
 287                 dprintk("%s() Checking QAM\n", __FUNCTION__);
 288                 reg = au8522_readreg(state, 0x4541);
 289                 if (reg & 0x80)
 290                         *status |= FE_HAS_VITERBI;
 291                 if (reg & 0x20)
 292                         *status |= FE_HAS_LOCK | FE_HAS_SYNC;
 293         }
 294
 295         switch(state->config->status_mode) {
 296         case AU8522_DEMODLOCKING:
 297                 dprintk("%s() DEMODLOCKING\n", __FUNCTION__);
 298                 if (*status & FE_HAS_VITERBI)
 299                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 300                 break;
 301         case AU8522_TUNERLOCKING:
 302                 /* Get the tuner status */
 303                 dprintk("%s() TUNERLOCKING\n", __FUNCTION__);
 304                 if (fe->ops.tuner_ops.get_status) {
 305                         if (fe->ops.i2c_gate_ctrl)
 306                                 fe->ops.i2c_gate_ctrl(fe, 1);
 307
 308                         fe->ops.tuner_ops.get_status(fe, &tuner_status);
 309
 310                         if (fe->ops.i2c_gate_ctrl)
 311                                 fe->ops.i2c_gate_ctrl(fe, 0);
 312                 }
 313                 if (tuner_status)
 314                         *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
 315                 break;
 316         }
 317
 318         dprintk("%s() status 0x%08x\n", __FUNCTION__, *status);
 319
 320         return 0;
 321 }
 322
 323 static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
 324 {
 325         dprintk("%s()\n", __FUNCTION__);
 326
 327         *snr = 0;
 328
 329         return 0;
 330 }
 331
 332 static int au8522_read_signal_strength(struct dvb_frontend *fe,
 333                                        u16 *signal_strength)
 334 {
 335         return au8522_read_snr(fe, signal_strength);
 336 }
 337
 338 static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 339 {
 340         struct au8522_state *state = fe->demodulator_priv;
 341
 342         *ucblocks = au8522_readreg(state, 0x4087);
 343
 344         return 0;
 345 }
 346
 347 static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
 348 {
 349         return au8522_read_ucblocks(fe, ber);
 350 }
 351
 352 static int au8522_get_frontend(struct dvb_frontend *fe,
 353                                 struct dvb_frontend_parameters *p)
 354 {
 355         struct au8522_state *state = fe->demodulator_priv;
 356
 357         p->frequency = state->current_frequency;
 358         p->u.vsb.modulation = state->current_modulation;
 359
 360         return 0;
 361 }
 362
 363 static int au8522_get_tune_settings(struct dvb_frontend *fe,
 364                                     struct dvb_frontend_tune_settings *tune)
 365 {
 366         tune->min_delay_ms = 1000;
 367         return 0;
 368 }
 369
 370 static void au8522_release(struct dvb_frontend *fe)
 371 {
 372         struct au8522_state *state = fe->demodulator_priv;
 373         kfree(state);
 374 }
 375
 376 static struct dvb_frontend_ops au8522_ops;
 377
 378 struct dvb_frontend *au8522_attach(const struct au8522_config *config,
 379                                    struct i2c_adapter *i2c)
 380 {
 381         struct au8522_state *state = NULL;
 382
 383         /* allocate memory for the internal state */
 384         state = kmalloc(sizeof(struct au8522_state), GFP_KERNEL);
 385         if (state == NULL)
 386                 goto error;
 387
 388         /* setup the state */
 389         state->config = config;
 390         state->i2c = i2c;
 391         /* create dvb_frontend */
 392         memcpy(&state->frontend.ops, &au8522_ops,
 393                sizeof(struct dvb_frontend_ops));
 394         state->frontend.demodulator_priv = state;
 395
 396         if (au8522_init(&state->frontend) != 0) {
 397                 printk(KERN_ERR "%s: Failed to initialize correctly\n",
 398                         __FUNCTION__);
 399                 goto error;
 400         }
 401
 402         /* Note: Leaving the I2C gate open here. */
 403         au8522_i2c_gate_ctrl(&state->frontend, 1);
 404
 405         return &state->frontend;
 406
 407 error:
 408         kfree(state);
 409         return NULL;
 410 }
 411
 412 static struct dvb_frontend_ops au8522_ops = {
 413
 414         .info = {
 415                 .name                   = "Auvitek AU8522 QAM/8VSB Frontend",
 416                 .type                   = FE_ATSC,
 417                 .frequency_min          = 54000000,
 418                 .frequency_max          = 858000000,
 419                 .frequency_stepsize     = 62500,
 420                 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
 421         },
 422
 423         .init                 = au8522_init,
 424         .i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
 425         .set_frontend         = au8522_set_frontend,
 426         .get_frontend         = au8522_get_frontend,
 427         .get_tune_settings    = au8522_get_tune_settings,
 428         .read_status          = au8522_read_status,
 429         .read_ber             = au8522_read_ber,
 430         .read_signal_strength = au8522_read_signal_strength,
 431         .read_snr             = au8522_read_snr,
 432         .read_ucblocks        = au8522_read_ucblocks,
 433         .release              = au8522_release,
 434 };
 435
 436 module_param(debug, int, 0644);
 437 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
 438
 439 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
 440 MODULE_AUTHOR("Steven Toth");
 441 MODULE_LICENSE("GPL");
 442
 443 EXPORT_SYMBOL(au8522_attach);
 444
 445 /*
 446  * Local variables:
 447  * c-basic-offset: 8
 448  */