drivers/media/dvb/frontends/cx22700.c

   1 /*
   2     Conexant cx22700 DVB OFDM demodulator driver
   3
   4     Copyright (C) 2001-2002 Convergence Integrated Media GmbH
   5         Holger Waechtler <holger@convergence.de>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  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
  23 #include <linux/kernel.h>
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29 #include "dvb_frontend.h"
  30 #include "cx22700.h"
  31
  32
  33 struct cx22700_state {
  34
  35         struct i2c_adapter* i2c;
  36
  37         struct dvb_frontend_ops ops;
  38
  39         const struct cx22700_config* config;
  40
  41         struct dvb_frontend frontend;
  42 };
  43
  44
  45 static int debug;
  46 #define dprintk(args...) \
  47         do { \
  48                 if (debug) printk(KERN_DEBUG "cx22700: " args); \
  49         } while (0)
  50
  51 static u8 init_tab [] = {
  52         0x04, 0x10,
  53         0x05, 0x09,
  54         0x06, 0x00,
  55         0x08, 0x04,
  56         0x09, 0x00,
  57         0x0a, 0x01,
  58         0x15, 0x40,
  59         0x16, 0x10,
  60         0x17, 0x87,
  61         0x18, 0x17,
  62         0x1a, 0x10,
  63         0x25, 0x04,
  64         0x2e, 0x00,
  65         0x39, 0x00,
  66         0x3a, 0x04,
  67         0x45, 0x08,
  68         0x46, 0x02,
  69         0x47, 0x05,
  70 };
  71
  72
  73 static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
  74 {
  75         int ret;
  76         u8 buf [] = { reg, data };
  77         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  78
  79         dprintk ("%s\n", __FUNCTION__);
  80
  81         ret = i2c_transfer (state->i2c, &msg, 1);
  82
  83         if (ret != 1)
  84                 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  85                         __FUNCTION__, reg, data, ret);
  86
  87         return (ret != 1) ? -1 : 0;
  88 }
  89
  90 static int cx22700_readreg (struct cx22700_state* state, u8 reg)
  91 {
  92         int ret;
  93         u8 b0 [] = { reg };
  94         u8 b1 [] = { 0 };
  95         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
  96                            { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
  97
  98         dprintk ("%s\n", __FUNCTION__);
  99
 100         ret = i2c_transfer (state->i2c, msg, 2);
 101
 102         if (ret != 2) return -EIO;
 103
 104         return b1[0];
 105 }
 106
 107 static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
 108 {
 109         u8 val;
 110
 111         dprintk ("%s\n", __FUNCTION__);
 112
 113         switch (inversion) {
 114         case INVERSION_AUTO:
 115                 return -EOPNOTSUPP;
 116         case INVERSION_ON:
 117                 val = cx22700_readreg (state, 0x09);
 118                 return cx22700_writereg (state, 0x09, val | 0x01);
 119         case INVERSION_OFF:
 120                 val = cx22700_readreg (state, 0x09);
 121                 return cx22700_writereg (state, 0x09, val & 0xfe);
 122         default:
 123                 return -EINVAL;
 124         }
 125 }
 126
 127 static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p)
 128 {
 129         static const u8 qam_tab [4] = { 0, 1, 0, 2 };
 130         static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
 131         u8 val;
 132
 133         dprintk ("%s\n", __FUNCTION__);
 134
 135         if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
 136                 return -EINVAL;
 137
 138         if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
 139
 140         if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
 141                 return -EINVAL;
 142
 143         if (p->guard_interval < GUARD_INTERVAL_1_32 ||
 144             p->guard_interval > GUARD_INTERVAL_1_4)
 145                 return -EINVAL;
 146
 147         if (p->transmission_mode != TRANSMISSION_MODE_2K &&
 148             p->transmission_mode != TRANSMISSION_MODE_8K)
 149                 return -EINVAL;
 150
 151         if (p->constellation != QPSK &&
 152             p->constellation != QAM_16 &&
 153             p->constellation != QAM_64)
 154                 return -EINVAL;
 155
 156         if (p->hierarchy_information < HIERARCHY_NONE ||
 157             p->hierarchy_information > HIERARCHY_4)
 158                 return -EINVAL;
 159
 160         if (p->bandwidth < BANDWIDTH_8_MHZ && p->bandwidth > BANDWIDTH_6_MHZ)
 161                 return -EINVAL;
 162
 163         if (p->bandwidth == BANDWIDTH_7_MHZ)
 164                 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
 165         else
 166                 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
 167
 168         val = qam_tab[p->constellation - QPSK];
 169         val |= p->hierarchy_information - HIERARCHY_NONE;
 170
 171         cx22700_writereg (state, 0x04, val);
 172
 173         val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
 174         val |= fec_tab[p->code_rate_LP - FEC_1_2];
 175
 176         cx22700_writereg (state, 0x05, val);
 177
 178         val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
 179         val |= p->transmission_mode - TRANSMISSION_MODE_2K;
 180
 181         cx22700_writereg (state, 0x06, val);
 182
 183         cx22700_writereg (state, 0x08, 0x04 | 0x02);  /* use user tps parameters */
 184         cx22700_writereg (state, 0x08, 0x04);         /* restart aquisition */
 185
 186         return 0;
 187 }
 188
 189 static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p)
 190 {
 191         static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
 192         static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
 193                                                     FEC_5_6, FEC_7_8 };
 194         u8 val;
 195
 196         dprintk ("%s\n", __FUNCTION__);
 197
 198         if (!(cx22700_readreg(state, 0x07) & 0x20))  /*  tps valid? */
 199                 return -EAGAIN;
 200
 201         val = cx22700_readreg (state, 0x01);
 202
 203         if ((val & 0x7) > 4)
 204                 p->hierarchy_information = HIERARCHY_AUTO;
 205         else
 206                 p->hierarchy_information = HIERARCHY_NONE + (val & 0x7);
 207
 208         if (((val >> 3) & 0x3) > 2)
 209                 p->constellation = QAM_AUTO;
 210         else
 211                 p->constellation = qam_tab[(val >> 3) & 0x3];
 212
 213         val = cx22700_readreg (state, 0x02);
 214
 215         if (((val >> 3) & 0x07) > 4)
 216                 p->code_rate_HP = FEC_AUTO;
 217         else
 218                 p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
 219
 220         if ((val & 0x07) > 4)
 221                 p->code_rate_LP = FEC_AUTO;
 222         else
 223                 p->code_rate_LP = fec_tab[val & 0x07];
 224
 225         val = cx22700_readreg (state, 0x03);
 226
 227         p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
 228         p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
 229
 230         return 0;
 231 }
 232
 233 static int cx22700_init (struct dvb_frontend* fe)
 234
 235 {       struct cx22700_state* state = fe->demodulator_priv;
 236         int i;
 237
 238         dprintk("cx22700_init: init chip\n");
 239
 240         cx22700_writereg (state, 0x00, 0x02);   /*  soft reset */
 241         cx22700_writereg (state, 0x00, 0x00);
 242
 243         msleep(10);
 244
 245         for (i=0; i<sizeof(init_tab); i+=2)
 246                 cx22700_writereg (state, init_tab[i], init_tab[i+1]);
 247
 248         cx22700_writereg (state, 0x00, 0x01);
 249
 250         if (state->config->pll_init) {
 251                 cx22700_writereg (state, 0x0a, 0x00);  /* open i2c bus switch */
 252                 state->config->pll_init(fe);
 253                 cx22700_writereg (state, 0x0a, 0x01);  /* close i2c bus switch */
 254         }
 255
 256         return 0;
 257 }
 258
 259 static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
 260 {
 261         struct cx22700_state* state = fe->demodulator_priv;
 262
 263         u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
 264                    | (cx22700_readreg (state, 0x0e) << 1);
 265         u8 sync = cx22700_readreg (state, 0x07);
 266
 267         *status = 0;
 268
 269         if (rs_ber < 0xff00)
 270                 *status |= FE_HAS_SIGNAL;
 271
 272         if (sync & 0x20)
 273                 *status |= FE_HAS_CARRIER;
 274
 275         if (sync & 0x10)
 276                 *status |= FE_HAS_VITERBI;
 277
 278         if (sync & 0x10)
 279                 *status |= FE_HAS_SYNC;
 280
 281         if (*status == 0x0f)
 282                 *status |= FE_HAS_LOCK;
 283
 284         return 0;
 285 }
 286
 287 static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
 288 {
 289         struct cx22700_state* state = fe->demodulator_priv;
 290
 291         *ber = cx22700_readreg (state, 0x0c) & 0x7f;
 292         cx22700_writereg (state, 0x0c, 0x00);
 293
 294         return 0;
 295 }
 296
 297 static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 298 {
 299         struct cx22700_state* state = fe->demodulator_priv;
 300
 301         u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
 302                    | (cx22700_readreg (state, 0x0e) << 1);
 303         *signal_strength = ~rs_ber;
 304
 305         return 0;
 306 }
 307
 308 static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
 309 {
 310         struct cx22700_state* state = fe->demodulator_priv;
 311
 312         u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
 313                    | (cx22700_readreg (state, 0x0e) << 1);
 314         *snr = ~rs_ber;
 315
 316         return 0;
 317 }
 318
 319 static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 320 {
 321         struct cx22700_state* state = fe->demodulator_priv;
 322
 323         *ucblocks = cx22700_readreg (state, 0x0f);
 324         cx22700_writereg (state, 0x0f, 0x00);
 325
 326         return 0;
 327 }
 328
 329 static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 330 {
 331         struct cx22700_state* state = fe->demodulator_priv;
 332
 333         cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
 334         cx22700_writereg (state, 0x00, 0x00);
 335
 336         cx22700_writereg (state, 0x0a, 0x00);  /* open i2c bus switch */
 337         state->config->pll_set(fe, p);
 338         cx22700_writereg (state, 0x0a, 0x01);  /* close i2c bus switch */
 339         cx22700_set_inversion (state, p->inversion);
 340         cx22700_set_tps (state, &p->u.ofdm);
 341         cx22700_writereg (state, 0x37, 0x01);  /* PAL loop filter off */
 342         cx22700_writereg (state, 0x00, 0x01);  /* restart acquire */
 343
 344         return 0;
 345 }
 346
 347 static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
 348 {
 349         struct cx22700_state* state = fe->demodulator_priv;
 350         u8 reg09 = cx22700_readreg (state, 0x09);
 351
 352         p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
 353         return cx22700_get_tps (state, &p->u.ofdm);
 354 }
 355
 356 static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 357 {
 358         fesettings->min_delay_ms = 150;
 359         fesettings->step_size = 166667;
 360         fesettings->max_drift = 166667*2;
 361         return 0;
 362 }
 363
 364 static void cx22700_release(struct dvb_frontend* fe)
 365 {
 366         struct cx22700_state* state = fe->demodulator_priv;
 367         kfree(state);
 368 }
 369
 370 static struct dvb_frontend_ops cx22700_ops;
 371
 372 struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
 373                                     struct i2c_adapter* i2c)
 374 {
 375         struct cx22700_state* state = NULL;
 376
 377         /* allocate memory for the internal state */
 378         state = kmalloc(sizeof(struct cx22700_state), GFP_KERNEL);
 379         if (state == NULL) goto error;
 380
 381         /* setup the state */
 382         state->config = config;
 383         state->i2c = i2c;
 384         memcpy(&state->ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
 385
 386         /* check if the demod is there */
 387         if (cx22700_readreg(state, 0x07) < 0) goto error;
 388
 389         /* create dvb_frontend */
 390         state->frontend.ops = &state->ops;
 391         state->frontend.demodulator_priv = state;
 392         return &state->frontend;
 393
 394 error:
 395         kfree(state);
 396         return NULL;
 397 }
 398
 399 static struct dvb_frontend_ops cx22700_ops = {
 400
 401         .info = {
 402                 .name                   = "Conexant CX22700 DVB-T",
 403                 .type                   = FE_OFDM,
 404                 .frequency_min          = 470000000,
 405                 .frequency_max          = 860000000,
 406                 .frequency_stepsize     = 166667,
 407                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 408                       FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 409                       FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
 410                       FE_CAN_RECOVER
 411         },
 412
 413         .release = cx22700_release,
 414
 415         .init = cx22700_init,
 416
 417         .set_frontend = cx22700_set_frontend,
 418         .get_frontend = cx22700_get_frontend,
 419         .get_tune_settings = cx22700_get_tune_settings,
 420
 421         .read_status = cx22700_read_status,
 422         .read_ber = cx22700_read_ber,
 423         .read_signal_strength = cx22700_read_signal_strength,
 424         .read_snr = cx22700_read_snr,
 425         .read_ucblocks = cx22700_read_ucblocks,
 426 };
 427
 428 module_param(debug, int, 0644);
 429 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 430
 431 MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
 432 MODULE_AUTHOR("Holger Waechtler");
 433 MODULE_LICENSE("GPL");
 434
 435 EXPORT_SYMBOL(cx22700_attach);