git.oblomov.eu Git - linux-2.6/blob - 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/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/string.h>
  27 #include <linux/slab.h>
  28
  29 #include "dvb_frontend.h"
  30 #include "zl10353_priv.h"
  31 #include "zl10353.h"
  32
  33 struct zl10353_state {
  34         struct i2c_adapter *i2c;
  35         struct dvb_frontend frontend;
  36
  37         struct zl10353_config config;
  38 };
  39
  40 static int debug;
  41 #define dprintk(args...) \
  42         do { \
  43                 if (debug) printk(KERN_DEBUG "zl10353: " args); \
  44         } while (0)
  45
  46 static int debug_regs = 0;
  47
  48 static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
  49 {
  50         struct zl10353_state *state = fe->demodulator_priv;
  51         u8 buf[2] = { reg, val };
  52         struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
  53                                .buf = buf, .len = 2 };
  54         int err = i2c_transfer(state->i2c, &msg, 1);
  55         if (err != 1) {
  56                 printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
  57                 return err;
  58         }
  59         return 0;
  60 }
  61
  62 static int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
  63 {
  64         int err, i;
  65         for (i = 0; i < ilen - 1; i++)
  66                 if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
  67                         return err;
  68
  69         return 0;
  70 }
  71
  72 static int zl10353_read_register(struct zl10353_state *state, u8 reg)
  73 {
  74         int ret;
  75         u8 b0[1] = { reg };
  76         u8 b1[1] = { 0 };
  77         struct i2c_msg msg[2] = { { .addr = state->config.demod_address,
  78                                     .flags = 0,
  79                                     .buf = b0, .len = 1 },
  80                                   { .addr = state->config.demod_address,
  81                                     .flags = I2C_M_RD,
  82                                     .buf = b1, .len = 1 } };
  83
  84         ret = i2c_transfer(state->i2c, msg, 2);
  85
  86         if (ret != 2) {
  87                 printk("%s: readreg error (reg=%d, ret==%i)\n",
  88                        __FUNCTION__, reg, ret);
  89                 return ret;
  90         }
  91
  92         return b1[0];
  93 }
  94
  95 static void zl10353_dump_regs(struct dvb_frontend *fe)
  96 {
  97         struct zl10353_state *state = fe->demodulator_priv;
  98         char buf[52], buf2[4];
  99         int ret;
 100         u8 reg;
 101
 102         /* Dump all registers. */
 103         for (reg = 0; ; reg++) {
 104                 if (reg % 16 == 0) {
 105                         if (reg)
 106                                 printk(KERN_DEBUG "%s\n", buf);
 107                         sprintf(buf, "%02x: ", reg);
 108                 }
 109                 ret = zl10353_read_register(state, reg);
 110                 if (ret >= 0)
 111                         sprintf(buf2, "%02x ", (u8)ret);
 112                 else
 113                         strcpy(buf2, "-- ");
 114                 strcat(buf, buf2);
 115                 if (reg == 0xff)
 116                         break;
 117         }
 118         printk(KERN_DEBUG "%s\n", buf);
 119 }
 120
 121 static void zl10353_calc_nominal_rate(struct dvb_frontend *fe,
 122                                       enum fe_bandwidth bandwidth,
 123                                       u16 *nominal_rate)
 124 {
 125         u32 adc_clock = 22528; /* 20.480 MHz on the board(!?) */
 126         u8 bw;
 127         struct zl10353_state *state = fe->demodulator_priv;
 128
 129         if (state->config.adc_clock)
 130                 adc_clock = state->config.adc_clock;
 131
 132         switch (bandwidth) {
 133         case BANDWIDTH_6_MHZ:
 134                 bw = 6;
 135                 break;
 136         case BANDWIDTH_7_MHZ:
 137                 bw = 7;
 138                 break;
 139         case BANDWIDTH_8_MHZ:
 140         default:
 141                 bw = 8;
 142                 break;
 143         }
 144
 145         *nominal_rate = (64 * bw * (1<<16) / (7 * 8) * 4000 / adc_clock + 2) / 4;
 146
 147         dprintk("%s: bw %d, adc_clock %d => 0x%x\n",
 148                 __FUNCTION__, bw, adc_clock, *nominal_rate);
 149 }
 150
 151 static int zl10353_sleep(struct dvb_frontend *fe)
 152 {
 153         static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };
 154
 155         zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
 156         return 0;
 157 }
 158
 159 static int zl10353_set_parameters(struct dvb_frontend *fe,
 160                                   struct dvb_frontend_parameters *param)
 161 {
 162         struct zl10353_state *state = fe->demodulator_priv;
 163         u16 nominal_rate;
 164         u8 pllbuf[6] = { 0x67 };
 165
 166         /* These settings set "auto-everything" and start the FSM. */
 167         zl10353_single_write(fe, 0x55, 0x80);
 168         udelay(200);
 169         zl10353_single_write(fe, 0xEA, 0x01);
 170         udelay(200);
 171         zl10353_single_write(fe, 0xEA, 0x00);
 172
 173         zl10353_single_write(fe, 0x56, 0x28);
 174         zl10353_single_write(fe, 0x89, 0x20);
 175         zl10353_single_write(fe, 0x5E, 0x00);
 176
 177         zl10353_calc_nominal_rate(fe, param->u.ofdm.bandwidth, &nominal_rate);
 178         zl10353_single_write(fe, TRL_NOMINAL_RATE_1, msb(nominal_rate));
 179         zl10353_single_write(fe, TRL_NOMINAL_RATE_0, lsb(nominal_rate));
 180
 181         zl10353_single_write(fe, 0x6C, 0xCD);
 182         zl10353_single_write(fe, 0x6D, 0x7E);
 183         if (fe->ops.i2c_gate_ctrl)
 184                 fe->ops.i2c_gate_ctrl(fe, 0);
 185
 186         // if there is no attached secondary tuner, we call set_params to program
 187         // a potential tuner attached somewhere else
 188         if (state->config.no_tuner) {
 189                 if (fe->ops.tuner_ops.set_params) {
 190                         fe->ops.tuner_ops.set_params(fe, param);
 191                         if (fe->ops.i2c_gate_ctrl)
 192                                 fe->ops.i2c_gate_ctrl(fe, 0);
 193                 }
 194         }
 195
 196         // if pllbuf is defined, retrieve the settings
 197         if (fe->ops.tuner_ops.calc_regs) {
 198                 fe->ops.tuner_ops.calc_regs(fe, param, pllbuf+1, 5);
 199                 pllbuf[1] <<= 1;
 200         } else {
 201                 // fake pllbuf settings
 202                 pllbuf[1] = 0x61 << 1;
 203                 pllbuf[2] = 0;
 204                 pllbuf[3] = 0;
 205                 pllbuf[3] = 0;
 206                 pllbuf[4] = 0;
 207         }
 208
 209         // there is no call to _just_ start decoding, so we send the pllbuf anyway
 210         // even if there isn't a PLL attached to the secondary bus
 211         zl10353_write(fe, pllbuf, sizeof(pllbuf));
 212
 213         zl10353_single_write(fe, 0x5F, 0x13);
 214         zl10353_single_write(fe, 0x70, 0x01);
 215         udelay(250);
 216         zl10353_single_write(fe, 0xE4, 0x00);
 217         zl10353_single_write(fe, 0xE5, 0x2A);
 218         zl10353_single_write(fe, 0xE9, 0x02);
 219         zl10353_single_write(fe, 0xE7, 0x40);
 220         zl10353_single_write(fe, 0xE8, 0x10);
 221
 222         return 0;
 223 }
 224
 225 static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
 226 {
 227         struct zl10353_state *state = fe->demodulator_priv;
 228         int s6, s7, s8;
 229
 230         if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
 231                 return -EREMOTEIO;
 232         if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
 233                 return -EREMOTEIO;
 234         if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
 235                 return -EREMOTEIO;
 236
 237         *status = 0;
 238         if (s6 & (1 << 2))
 239                 *status |= FE_HAS_CARRIER;
 240         if (s6 & (1 << 1))
 241                 *status |= FE_HAS_VITERBI;
 242         if (s6 & (1 << 5))
 243                 *status |= FE_HAS_LOCK;
 244         if (s7 & (1 << 4))
 245                 *status |= FE_HAS_SYNC;
 246         if (s8 & (1 << 6))
 247                 *status |= FE_HAS_SIGNAL;
 248
 249         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
 250             (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
 251                 *status &= ~FE_HAS_LOCK;
 252
 253         return 0;
 254 }
 255
 256 static int zl10353_read_ber(struct dvb_frontend *fe, u32 *ber)
 257 {
 258         struct zl10353_state *state = fe->demodulator_priv;
 259
 260         *ber = zl10353_read_register(state, RS_ERR_CNT_2) << 16 |
 261                zl10353_read_register(state, RS_ERR_CNT_1) << 8 |
 262                zl10353_read_register(state, RS_ERR_CNT_0);
 263
 264         return 0;
 265 }
 266
 267 static int zl10353_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
 268 {
 269         struct zl10353_state *state = fe->demodulator_priv;
 270
 271         u16 signal = zl10353_read_register(state, AGC_GAIN_1) << 10 |
 272                      zl10353_read_register(state, AGC_GAIN_0) << 2 | 3;
 273
 274         *strength = ~signal;
 275
 276         return 0;
 277 }
 278
 279 static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
 280 {
 281         struct zl10353_state *state = fe->demodulator_priv;
 282         u8 _snr;
 283
 284         if (debug_regs)
 285                 zl10353_dump_regs(fe);
 286
 287         _snr = zl10353_read_register(state, SNR);
 288         *snr = (_snr << 8) | _snr;
 289
 290         return 0;
 291 }
 292
 293 static int zl10353_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 294 {
 295         struct zl10353_state *state = fe->demodulator_priv;
 296
 297         *ucblocks = zl10353_read_register(state, RS_UBC_1) << 8 |
 298                     zl10353_read_register(state, RS_UBC_0);
 299
 300         return 0;
 301 }
 302
 303 static int zl10353_get_tune_settings(struct dvb_frontend *fe,
 304                                      struct dvb_frontend_tune_settings
 305                                          *fe_tune_settings)
 306 {
 307         fe_tune_settings->min_delay_ms = 1000;
 308         fe_tune_settings->step_size = 0;
 309         fe_tune_settings->max_drift = 0;
 310
 311         return 0;
 312 }
 313
 314 static int zl10353_init(struct dvb_frontend *fe)
 315 {
 316         struct zl10353_state *state = fe->demodulator_priv;
 317         u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
 318         int rc = 0;
 319
 320         if (debug_regs)
 321                 zl10353_dump_regs(fe);
 322         if (state->config.parallel_ts)
 323                 zl10353_reset_attach[2] &= ~0x20;
 324
 325         /* Do a "hard" reset if not already done */
 326         if (zl10353_read_register(state, 0x50) != zl10353_reset_attach[1] ||
 327             zl10353_read_register(state, 0x51) != zl10353_reset_attach[2]) {
 328                 rc = zl10353_write(fe, zl10353_reset_attach,
 329                                    sizeof(zl10353_reset_attach));
 330                 if (debug_regs)
 331                         zl10353_dump_regs(fe);
 332         }
 333
 334         return 0;
 335 }
 336
 337 static int zl10353_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 338 {
 339         u8 val = 0x0a;
 340
 341         if (enable)
 342                 val |= 0x10;
 343
 344         return zl10353_single_write(fe, 0x62, val);
 345 }
 346
 347 static void zl10353_release(struct dvb_frontend *fe)
 348 {
 349         struct zl10353_state *state = fe->demodulator_priv;
 350         kfree(state);
 351 }
 352
 353 static struct dvb_frontend_ops zl10353_ops;
 354
 355 struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
 356                                     struct i2c_adapter *i2c)
 357 {
 358         struct zl10353_state *state = NULL;
 359
 360         /* allocate memory for the internal state */
 361         state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
 362         if (state == NULL)
 363                 goto error;
 364
 365         /* setup the state */
 366         state->i2c = i2c;
 367         memcpy(&state->config, config, sizeof(struct zl10353_config));
 368
 369         /* check if the demod is there */
 370         if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
 371                 goto error;
 372
 373         /* create dvb_frontend */
 374         memcpy(&state->frontend.ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
 375         state->frontend.demodulator_priv = state;
 376
 377         return &state->frontend;
 378 error:
 379         kfree(state);
 380         return NULL;
 381 }
 382
 383 static struct dvb_frontend_ops zl10353_ops = {
 384
 385         .info = {
 386                 .name                   = "Zarlink ZL10353 DVB-T",
 387                 .type                   = FE_OFDM,
 388                 .frequency_min          = 174000000,
 389                 .frequency_max          = 862000000,
 390                 .frequency_stepsize     = 166667,
 391                 .frequency_tolerance    = 0,
 392                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
 393                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
 394                         FE_CAN_FEC_AUTO |
 395                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 396                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
 397                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
 398                         FE_CAN_MUTE_TS
 399         },
 400
 401         .release = zl10353_release,
 402
 403         .init = zl10353_init,
 404         .sleep = zl10353_sleep,
 405         .i2c_gate_ctrl = zl10353_i2c_gate_ctrl,
 406         .write = zl10353_write,
 407
 408         .set_frontend = zl10353_set_parameters,
 409         .get_tune_settings = zl10353_get_tune_settings,
 410
 411         .read_status = zl10353_read_status,
 412         .read_ber = zl10353_read_ber,
 413         .read_signal_strength = zl10353_read_signal_strength,
 414         .read_snr = zl10353_read_snr,
 415         .read_ucblocks = zl10353_read_ucblocks,
 416 };
 417
 418 module_param(debug, int, 0644);
 419 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 420
 421 module_param(debug_regs, int, 0644);
 422 MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");
 423
 424 MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
 425 MODULE_AUTHOR("Chris Pascoe");
 426 MODULE_LICENSE("GPL");
 427
 428 EXPORT_SYMBOL(zl10353_attach);