drivers/media/dvb/frontends/zl10353.c

   1 /*
   2  * Driver for Zarlink DVB-T ZL10353 demodulator
   3  *
   4  * Copyright (C) 2006 Christopher Pascoe <c.pascoe@itee.uq.edu.au>
   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/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29
  30 #include "dvb_frontend.h"
  31 #include "zl10353_priv.h"
  32 #include "zl10353.h"
  33
  34 struct zl10353_state {
  35         struct i2c_adapter *i2c;
  36         struct dvb_frontend frontend;
  37
  38         struct zl10353_config config;
  39 };
  40
  41 static int debug;
  42 #define dprintk(args...) \
  43         do { \
  44                 if (debug) printk(KERN_DEBUG "zl10353: " args); \
  45         } while (0)
  46
  47 static int debug_regs = 0;
  48
  49 static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
  50 {
  51         struct zl10353_state *state = fe->demodulator_priv;
  52         u8 buf[2] = { reg, val };
  53         struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
  54                                .buf = buf, .len = 2 };
  55         int err = i2c_transfer(state->i2c, &msg, 1);
  56         if (err != 1) {
  57                 printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
  58                 return err;
  59         }
  60         return 0;
  61 }
  62
  63 static int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
  64 {
  65         int err, i;
  66         for (i = 0; i < ilen - 1; i++)
  67                 if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
  68                         return err;
  69
  70         return 0;
  71 }
  72
  73 static int zl10353_read_register(struct zl10353_state *state, u8 reg)
  74 {
  75         int ret;
  76         u8 b0[1] = { reg };
  77         u8 b1[1] = { 0 };
  78         struct i2c_msg msg[2] = { { .addr = state->config.demod_address,
  79                                     .flags = 0,
  80                                     .buf = b0, .len = 1 },
  81                                   { .addr = state->config.demod_address,
  82                                     .flags = I2C_M_RD,
  83                                     .buf = b1, .len = 1 } };
  84
  85         ret = i2c_transfer(state->i2c, msg, 2);
  86
  87         if (ret != 2) {
  88                 printk("%s: readreg error (reg=%d, ret==%i)\n",
  89                        __FUNCTION__, reg, ret);
  90                 return ret;
  91         }
  92
  93         return b1[0];
  94 }
  95
  96 static void zl10353_dump_regs(struct dvb_frontend *fe)
  97 {
  98         struct zl10353_state *state = fe->demodulator_priv;
  99         char buf[52], buf2[4];
 100         int ret;
 101         u8 reg;
 102
 103         /* Dump all registers. */
 104         for (reg = 0; ; reg++) {
 105                 if (reg % 16 == 0) {
 106                         if (reg)
 107                                 printk(KERN_DEBUG "%s\n", buf);
 108                         sprintf(buf, "%02x: ", reg);
 109                 }
 110                 ret = zl10353_read_register(state, reg);
 111                 if (ret >= 0)
 112                         sprintf(buf2, "%02x ", (u8)ret);
 113                 else
 114                         strcpy(buf2, "-- ");
 115                 strcat(buf, buf2);
 116                 if (reg == 0xff)
 117                         break;
 118         }
 119         printk(KERN_DEBUG "%s\n", buf);
 120 }
 121
 122 static void zl10353_calc_nominal_rate(struct dvb_frontend *fe,
 123                                       enum fe_bandwidth bandwidth,
 124                                       u16 *nominal_rate)
 125 {
 126         u32 adc_clock = 22528; /* 20.480 MHz on the board(!?) */
 127         u8 bw;
 128         struct zl10353_state *state = fe->demodulator_priv;
 129
 130         if (state->config.adc_clock)
 131                 adc_clock = state->config.adc_clock;
 132
 133         switch (bandwidth) {
 134         case BANDWIDTH_6_MHZ:
 135                 bw = 6;
 136                 break;
 137         case BANDWIDTH_7_MHZ:
 138                 bw = 7;
 139                 break;
 140         case BANDWIDTH_8_MHZ:
 141         default:
 142                 bw = 8;
 143                 break;
 144         }
 145
 146         *nominal_rate = (64 * bw * (1<<16) / (7 * 8) * 4000 / adc_clock + 2) / 4;
 147
 148         dprintk("%s: bw %d, adc_clock %d => 0x%x\n",
 149                 __FUNCTION__, bw, adc_clock, *nominal_rate);
 150 }
 151
 152 static int zl10353_sleep(struct dvb_frontend *fe)
 153 {
 154         static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };
 155
 156         zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
 157         return 0;
 158 }
 159
 160 static int zl10353_set_parameters(struct dvb_frontend *fe,
 161                                   struct dvb_frontend_parameters *param)
 162 {
 163         struct zl10353_state *state = fe->demodulator_priv;
 164         u16 nominal_rate;
 165         u8 pllbuf[6] = { 0x67 };
 166
 167         /* These settings set "auto-everything" and start the FSM. */
 168         zl10353_single_write(fe, 0x55, 0x80);
 169         udelay(200);
 170         zl10353_single_write(fe, 0xEA, 0x01);
 171         udelay(200);
 172         zl10353_single_write(fe, 0xEA, 0x00);
 173
 174         zl10353_single_write(fe, 0x56, 0x28);
 175         zl10353_single_write(fe, 0x89, 0x20);
 176         zl10353_single_write(fe, 0x5E, 0x00);
 177
 178         zl10353_calc_nominal_rate(fe, param->u.ofdm.bandwidth, &nominal_rate);
 179         zl10353_single_write(fe, TRL_NOMINAL_RATE_1, msb(nominal_rate));
 180         zl10353_single_write(fe, TRL_NOMINAL_RATE_0, lsb(nominal_rate));
 181
 182         zl10353_single_write(fe, 0x6C, 0xCD);
 183         zl10353_single_write(fe, 0x6D, 0x7E);
 184         if (fe->ops.i2c_gate_ctrl)
 185                 fe->ops.i2c_gate_ctrl(fe, 0);
 186
 187         // if there is no attached secondary tuner, we call set_params to program
 188         // a potential tuner attached somewhere else
 189         if (state->config.no_tuner) {
 190                 if (fe->ops.tuner_ops.set_params) {
 191                         fe->ops.tuner_ops.set_params(fe, param);
 192                         if (fe->ops.i2c_gate_ctrl)
 193                                 fe->ops.i2c_gate_ctrl(fe, 0);
 194                 }
 195         }
 196
 197         // if pllbuf is defined, retrieve the settings
 198         if (fe->ops.tuner_ops.calc_regs) {
 199                 fe->ops.tuner_ops.calc_regs(fe, param, pllbuf+1, 5);
 200                 pllbuf[1] <<= 1;
 201         } else {
 202                 // fake pllbuf settings
 203                 pllbuf[1] = 0x61 << 1;
 204                 pllbuf[2] = 0;
 205                 pllbuf[3] = 0;
 206                 pllbuf[3] = 0;
 207                 pllbuf[4] = 0;
 208         }
 209
 210         // there is no call to _just_ start decoding, so we send the pllbuf anyway
 211         // even if there isn't a PLL attached to the secondary bus
 212         zl10353_write(fe, pllbuf, sizeof(pllbuf));
 213
 214         zl10353_single_write(fe, 0x5F, 0x13);
 215         zl10353_single_write(fe, 0x70, 0x01);
 216         udelay(250);
 217         zl10353_single_write(fe, 0xE4, 0x00);
 218         zl10353_single_write(fe, 0xE5, 0x2A);
 219         zl10353_single_write(fe, 0xE9, 0x02);
 220         zl10353_single_write(fe, 0xE7, 0x40);
 221         zl10353_single_write(fe, 0xE8, 0x10);
 222
 223         return 0;
 224 }
 225
 226 static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
 227 {
 228         struct zl10353_state *state = fe->demodulator_priv;
 229         int s6, s7, s8;
 230
 231         if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
 232                 return -EREMOTEIO;
 233         if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
 234                 return -EREMOTEIO;
 235         if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
 236                 return -EREMOTEIO;
 237
 238         *status = 0;
 239         if (s6 & (1 << 2))
 240                 *status |= FE_HAS_CARRIER;
 241         if (s6 & (1 << 1))
 242                 *status |= FE_HAS_VITERBI;
 243         if (s6 & (1 << 5))
 244                 *status |= FE_HAS_LOCK;
 245         if (s7 & (1 << 4))
 246                 *status |= FE_HAS_SYNC;
 247         if (s8 & (1 << 6))
 248                 *status |= FE_HAS_SIGNAL;
 249
 250         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
 251             (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
 252                 *status &= ~FE_HAS_LOCK;
 253
 254         return 0;
 255 }
 256
 257 static int zl10353_read_ber(struct dvb_frontend *fe, u32 *ber)
 258 {
 259         struct zl10353_state *state = fe->demodulator_priv;
 260
 261         *ber = zl10353_read_register(state, RS_ERR_CNT_2) << 16 |
 262                zl10353_read_register(state, RS_ERR_CNT_1) << 8 |
 263                zl10353_read_register(state, RS_ERR_CNT_0);
 264
 265         return 0;
 266 }
 267
 268 static int zl10353_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 269 {
 270         struct zl10353_state *state = fe->demodulator_priv;
 271
 272         u16 signal = zl10353_read_register(state, AGC_GAIN_1) << 10 |
 273                      zl10353_read_register(state, AGC_GAIN_0) << 2 | 3;
 274
 275         *strength = ~signal;
 276
 277         return 0;
 278 }
 279
 280 static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
 281 {
 282         struct zl10353_state *state = fe->demodulator_priv;
 283         u8 _snr;
 284
 285         if (debug_regs)
 286                 zl10353_dump_regs(fe);
 287
 288         _snr = zl10353_read_register(state, SNR);
 289         *snr = (_snr << 8) | _snr;
 290
 291         return 0;
 292 }
 293
 294 static int zl10353_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 295 {
 296         struct zl10353_state *state = fe->demodulator_priv;
 297
 298         *ucblocks = zl10353_read_register(state, RS_UBC_1) << 8 |
 299                     zl10353_read_register(state, RS_UBC_0);
 300
 301         return 0;
 302 }
 303
 304 static int zl10353_get_tune_settings(struct dvb_frontend *fe,
 305                                      struct dvb_frontend_tune_settings
 306                                          *fe_tune_settings)
 307 {
 308         fe_tune_settings->min_delay_ms = 1000;
 309         fe_tune_settings->step_size = 0;
 310         fe_tune_settings->max_drift = 0;
 311
 312         return 0;
 313 }
 314
 315 static int zl10353_init(struct dvb_frontend *fe)
 316 {
 317         struct zl10353_state *state = fe->demodulator_priv;
 318         u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
 319         int rc = 0;
 320
 321         if (debug_regs)
 322                 zl10353_dump_regs(fe);
 323         if (state->config.parallel_ts)
 324                 zl10353_reset_attach[2] &= ~0x20;
 325
 326         /* Do a "hard" reset if not already done */
 327         if (zl10353_read_register(state, 0x50) != zl10353_reset_attach[1] ||
 328             zl10353_read_register(state, 0x51) != zl10353_reset_attach[2]) {
 329                 rc = zl10353_write(fe, zl10353_reset_attach,
 330                                    sizeof(zl10353_reset_attach));
 331                 if (debug_regs)
 332                         zl10353_dump_regs(fe);
 333         }
 334
 335         return 0;
 336 }
 337
 338 static int zl10353_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 339 {
 340         u8 val = 0x0a;
 341
 342         if (enable)
 343                 val |= 0x10;
 344
 345         return zl10353_single_write(fe, 0x62, val);
 346 }
 347
 348 static void zl10353_release(struct dvb_frontend *fe)
 349 {
 350         struct zl10353_state *state = fe->demodulator_priv;
 351         kfree(state);
 352 }
 353
 354 static struct dvb_frontend_ops zl10353_ops;
 355
 356 struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
 357                                     struct i2c_adapter *i2c)
 358 {
 359         struct zl10353_state *state = NULL;
 360
 361         /* allocate memory for the internal state */
 362         state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
 363         if (state == NULL)
 364                 goto error;
 365
 366         /* setup the state */
 367         state->i2c = i2c;
 368         memcpy(&state->config, config, sizeof(struct zl10353_config));
 369
 370         /* check if the demod is there */
 371         if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
 372                 goto error;
 373
 374         /* create dvb_frontend */
 375         memcpy(&state->frontend.ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
 376         state->frontend.demodulator_priv = state;
 377
 378         return &state->frontend;
 379 error:
 380         kfree(state);
 381         return NULL;
 382 }
 383
 384 static struct dvb_frontend_ops zl10353_ops = {
 385
 386         .info = {
 387                 .name                   = "Zarlink ZL10353 DVB-T",
 388                 .type                   = FE_OFDM,
 389                 .frequency_min          = 174000000,
 390                 .frequency_max          = 862000000,
 391                 .frequency_stepsize     = 166667,
 392                 .frequency_tolerance    = 0,
 393                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
 394                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 395                         FE_CAN_FEC_AUTO |
 396                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 397                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 398                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
 399                         FE_CAN_MUTE_TS
 400         },
 401
 402         .release = zl10353_release,
 403
 404         .init = zl10353_init,
 405         .sleep = zl10353_sleep,
 406         .i2c_gate_ctrl = zl10353_i2c_gate_ctrl,
 407         .write = zl10353_write,
 408
 409         .set_frontend = zl10353_set_parameters,
 410         .get_tune_settings = zl10353_get_tune_settings,
 411
 412         .read_status = zl10353_read_status,
 413         .read_ber = zl10353_read_ber,
 414         .read_signal_strength = zl10353_read_signal_strength,
 415         .read_snr = zl10353_read_snr,
 416         .read_ucblocks = zl10353_read_ucblocks,
 417 };
 418
 419 module_param(debug, int, 0644);
 420 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 421
 422 module_param(debug_regs, int, 0644);
 423 MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");
 424
 425 MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
 426 MODULE_AUTHOR("Chris Pascoe");
 427 MODULE_LICENSE("GPL");
 428
 429 EXPORT_SYMBOL(zl10353_attach);