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/string.h>
  27 #include <linux/slab.h>
  28 #include "dvb_frontend.h"
  29 #include "cx22700.h"
  30
  31
  32 struct cx22700_state {
  33
  34         struct i2c_adapter* i2c;
  35
  36         const struct cx22700_config* config;
  37
  38         struct dvb_frontend frontend;
  39 };
  40
  41
  42 static int debug;
  43 #define dprintk(args...) \
  44         do { \
  45                 if (debug) printk(KERN_DEBUG "cx22700: " args); \
  46         } while (0)
  47
  48 static u8 init_tab [] = {
  49         0x04, 0x10,
  50         0x05, 0x09,
  51         0x06, 0x00,
  52         0x08, 0x04,
  53         0x09, 0x00,
  54         0x0a, 0x01,
  55         0x15, 0x40,
  56         0x16, 0x10,
  57         0x17, 0x87,
  58         0x18, 0x17,
  59         0x1a, 0x10,
  60         0x25, 0x04,
  61         0x2e, 0x00,
  62         0x39, 0x00,
  63         0x3a, 0x04,
  64         0x45, 0x08,
  65         0x46, 0x02,
  66         0x47, 0x05,
  67 };
  68
  69
  70 static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
  71 {
  72         int ret;
  73         u8 buf [] = { reg, data };
  74         struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
  75
  76         dprintk ("%s\n", __func__);
  77
  78         ret = i2c_transfer (state->i2c, &msg, 1);
  79
  80         if (ret != 1)
  81                 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
  82                         __func__, reg, data, ret);
  83
  84         return (ret != 1) ? -1 : 0;
  85 }
  86
  87 static int cx22700_readreg (struct cx22700_state* state, u8 reg)
  88 {
  89         int ret;
  90         u8 b0 [] = { reg };
  91         u8 b1 [] = { 0 };
  92         struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
  93                            { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
  94
  95         dprintk ("%s\n", __func__);
  96
  97         ret = i2c_transfer (state->i2c, msg, 2);
  98
  99         if (ret != 2) return -EIO;
 100
 101         return b1[0];
 102 }
 103
 104 static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
 105 {
 106         u8 val;
 107
 108         dprintk ("%s\n", __func__);
 109
 110         switch (inversion) {
 111         case INVERSION_AUTO:
 112                 return -EOPNOTSUPP;
 113         case INVERSION_ON:
 114                 val = cx22700_readreg (state, 0x09);
 115                 return cx22700_writereg (state, 0x09, val | 0x01);
 116         case INVERSION_OFF:
 117                 val = cx22700_readreg (state, 0x09);
 118                 return cx22700_writereg (state, 0x09, val & 0xfe);
 119         default:
 120                 return -EINVAL;
 121         }
 122 }
 123
 124 static int cx22700_set_tps(struct cx22700_state *state,
 125                            struct dtv_frontend_properties *p)
 126 {
 127         static const u8 qam_tab [4] = { 0, 1, 0, 2 };
 128         static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
 129         u8 val;
 130
 131         dprintk ("%s\n", __func__);
 132
 133         if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
 134                 return -EINVAL;
 135
 136         if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
 137                 return -EINVAL;
 138
 139         if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
 140                 return -EINVAL;
 141
 142         if ((int)p->guard_interval < GUARD_INTERVAL_1_32 ||
 143             p->guard_interval > GUARD_INTERVAL_1_4)
 144                 return -EINVAL;
 145
 146         if (p->transmission_mode != TRANSMISSION_MODE_2K &&
 147             p->transmission_mode != TRANSMISSION_MODE_8K)
 148                 return -EINVAL;
 149
 150         if (p->modulation != QPSK &&
 151             p->modulation != QAM_16 &&
 152             p->modulation != QAM_64)
 153                 return -EINVAL;
 154
 155         if ((int)p->hierarchy < HIERARCHY_NONE ||
 156             p->hierarchy > HIERARCHY_4)
 157                 return -EINVAL;
 158
 159         if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000)
 160                 return -EINVAL;
 161
 162         if (p->bandwidth_hz == 7000000)
 163                 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
 164         else
 165                 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
 166
 167         val = qam_tab[p->modulation - QPSK];
 168         val |= p->hierarchy - HIERARCHY_NONE;
 169
 170         cx22700_writereg (state, 0x04, val);
 171
 172         val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
 173         val |= fec_tab[p->code_rate_LP - FEC_1_2];
 174
 175         cx22700_writereg (state, 0x05, val);
 176
 177         val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
 178         val |= p->transmission_mode - TRANSMISSION_MODE_2K;
 179
 180         cx22700_writereg (state, 0x06, val);
 181
 182         cx22700_writereg (state, 0x08, 0x04 | 0x02);  /* use user tps parameters */
 183         cx22700_writereg (state, 0x08, 0x04);         /* restart acquisition */
 184
 185         return 0;
 186 }
 187
 188 static int cx22700_get_tps(struct cx22700_state *state,
 189                            struct dtv_frontend_properties *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", __func__);
 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 = HIERARCHY_AUTO;
 205         else
 206                 p->hierarchy = HIERARCHY_NONE + (val & 0x7);
 207
 208         if (((val >> 3) & 0x3) > 2)
 209                 p->modulation = QAM_AUTO;
 210         else
 211                 p->modulation = 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         return 0;
 251 }
 252
 253 static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
 254 {
 255         struct cx22700_state* state = fe->demodulator_priv;
 256
 257         u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
 258                    | (cx22700_readreg (state, 0x0e) << 1);
 259         u8 sync = cx22700_readreg (state, 0x07);
 260
 261         *status = 0;
 262
 263         if (rs_ber < 0xff00)
 264                 *status |= FE_HAS_SIGNAL;
 265
 266         if (sync & 0x20)
 267                 *status |= FE_HAS_CARRIER;
 268
 269         if (sync & 0x10)
 270                 *status |= FE_HAS_VITERBI;
 271
 272         if (sync & 0x10)
 273                 *status |= FE_HAS_SYNC;
 274
 275         if (*status == 0x0f)
 276                 *status |= FE_HAS_LOCK;
 277
 278         return 0;
 279 }
 280
 281 static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
 282 {
 283         struct cx22700_state* state = fe->demodulator_priv;
 284
 285         *ber = cx22700_readreg (state, 0x0c) & 0x7f;
 286         cx22700_writereg (state, 0x0c, 0x00);
 287
 288         return 0;
 289 }
 290
 291 static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
 292 {
 293         struct cx22700_state* state = fe->demodulator_priv;
 294
 295         u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
 296                    | (cx22700_readreg (state, 0x0e) << 1);
 297         *signal_strength = ~rs_ber;
 298
 299         return 0;
 300 }
 301
 302 static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
 303 {
 304         struct cx22700_state* state = fe->demodulator_priv;
 305
 306         u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
 307                    | (cx22700_readreg (state, 0x0e) << 1);
 308         *snr = ~rs_ber;
 309
 310         return 0;
 311 }
 312
 313 static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
 314 {
 315         struct cx22700_state* state = fe->demodulator_priv;
 316
 317         *ucblocks = cx22700_readreg (state, 0x0f);
 318         cx22700_writereg (state, 0x0f, 0x00);
 319
 320         return 0;
 321 }
 322
 323 static int cx22700_set_frontend(struct dvb_frontend *fe)
 324 {
 325         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 326         struct cx22700_state* state = fe->demodulator_priv;
 327
 328         cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
 329         cx22700_writereg (state, 0x00, 0x00);
 330
 331         if (fe->ops.tuner_ops.set_params) {
 332                 fe->ops.tuner_ops.set_params(fe);
 333                 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
 334         }
 335
 336         cx22700_set_inversion(state, c->inversion);
 337         cx22700_set_tps(state, c);
 338         cx22700_writereg (state, 0x37, 0x01);  /* PAL loop filter off */
 339         cx22700_writereg (state, 0x00, 0x01);  /* restart acquire */
 340
 341         return 0;
 342 }
 343
 344 static int cx22700_get_frontend(struct dvb_frontend *fe)
 345 {
 346         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 347         struct cx22700_state* state = fe->demodulator_priv;
 348         u8 reg09 = cx22700_readreg (state, 0x09);
 349
 350         c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
 351         return cx22700_get_tps(state, c);
 352 }
 353
 354 static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 355 {
 356         struct cx22700_state* state = fe->demodulator_priv;
 357
 358         if (enable) {
 359                 return cx22700_writereg(state, 0x0a, 0x00);
 360         } else {
 361                 return cx22700_writereg(state, 0x0a, 0x01);
 362         }
 363 }
 364
 365 static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
 366 {
 367         fesettings->min_delay_ms = 150;
 368         fesettings->step_size = 166667;
 369         fesettings->max_drift = 166667*2;
 370         return 0;
 371 }
 372
 373 static void cx22700_release(struct dvb_frontend* fe)
 374 {
 375         struct cx22700_state* state = fe->demodulator_priv;
 376         kfree(state);
 377 }
 378
 379 static struct dvb_frontend_ops cx22700_ops;
 380
 381 struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
 382                                     struct i2c_adapter* i2c)
 383 {
 384         struct cx22700_state* state = NULL;
 385
 386         /* allocate memory for the internal state */
 387         state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
 388         if (state == NULL) goto error;
 389
 390         /* setup the state */
 391         state->config = config;
 392         state->i2c = i2c;
 393
 394         /* check if the demod is there */
 395         if (cx22700_readreg(state, 0x07) < 0) goto error;
 396
 397         /* create dvb_frontend */
 398         memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
 399         state->frontend.demodulator_priv = state;
 400         return &state->frontend;
 401
 402 error:
 403         kfree(state);
 404         return NULL;
 405 }
 406
 407 static struct dvb_frontend_ops cx22700_ops = {
 408         .delsys = { SYS_DVBT },
 409         .info = {
 410                 .name                   = "Conexant CX22700 DVB-T",
 411                 .frequency_min          = 470000000,
 412                 .frequency_max          = 860000000,
 413                 .frequency_stepsize     = 166667,
 414                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 415                       FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 416                       FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
 417                       FE_CAN_RECOVER
 418         },
 419
 420         .release = cx22700_release,
 421
 422         .init = cx22700_init,
 423         .i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
 424
 425         .set_frontend = cx22700_set_frontend,
 426         .get_frontend = cx22700_get_frontend,
 427         .get_tune_settings = cx22700_get_tune_settings,
 428
 429         .read_status = cx22700_read_status,
 430         .read_ber = cx22700_read_ber,
 431         .read_signal_strength = cx22700_read_signal_strength,
 432         .read_snr = cx22700_read_snr,
 433         .read_ucblocks = cx22700_read_ucblocks,
 434 };
 435
 436 module_param(debug, int, 0644);
 437 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
 438
 439 MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
 440 MODULE_AUTHOR("Holger Waechtler");
 441 MODULE_LICENSE("GPL");
 442
 443 EXPORT_SYMBOL(cx22700_attach);