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 if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) || 173 p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab)) 174 return -EINVAL; 175 val = fec_tab[p->code_rate_HP - FEC_1_2] << 3; 176 val |= fec_tab[p->code_rate_LP - FEC_1_2]; 177 178 cx22700_writereg (state, 0x05, val); 179 180 val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2; 181 val |= p->transmission_mode - TRANSMISSION_MODE_2K; 182 183 cx22700_writereg (state, 0x06, val); 184 185 cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */ 186 cx22700_writereg (state, 0x08, 0x04); /* restart acquisition */ 187 188 return 0; 189 } 190 191 static int cx22700_get_tps(struct cx22700_state *state, 192 struct dtv_frontend_properties *p) 193 { 194 static const enum fe_modulation qam_tab[3] = { QPSK, QAM_16, QAM_64 }; 195 static const enum fe_code_rate fec_tab[5] = { 196 FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8 197 }; 198 u8 val; 199 200 dprintk ("%s\n", __func__); 201 202 if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */ 203 return -EAGAIN; 204 205 val = cx22700_readreg (state, 0x01); 206 207 if ((val & 0x7) > 4) 208 p->hierarchy = HIERARCHY_AUTO; 209 else 210 p->hierarchy = HIERARCHY_NONE + (val & 0x7); 211 212 if (((val >> 3) & 0x3) > 2) 213 p->modulation = QAM_AUTO; 214 else 215 p->modulation = qam_tab[(val >> 3) & 0x3]; 216 217 val = cx22700_readreg (state, 0x02); 218 219 if (((val >> 3) & 0x07) > 4) 220 p->code_rate_HP = FEC_AUTO; 221 else 222 p->code_rate_HP = fec_tab[(val >> 3) & 0x07]; 223 224 if ((val & 0x07) > 4) 225 p->code_rate_LP = FEC_AUTO; 226 else 227 p->code_rate_LP = fec_tab[val & 0x07]; 228 229 val = cx22700_readreg (state, 0x03); 230 231 p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3); 232 p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1); 233 234 return 0; 235 } 236 237 static int cx22700_init (struct dvb_frontend* fe) 238 239 { struct cx22700_state* state = fe->demodulator_priv; 240 int i; 241 242 dprintk("cx22700_init: init chip\n"); 243 244 cx22700_writereg (state, 0x00, 0x02); /* soft reset */ 245 cx22700_writereg (state, 0x00, 0x00); 246 247 msleep(10); 248 249 for (i=0; i<sizeof(init_tab); i+=2) 250 cx22700_writereg (state, init_tab[i], init_tab[i+1]); 251 252 cx22700_writereg (state, 0x00, 0x01); 253 254 return 0; 255 } 256 257 static int cx22700_read_status(struct dvb_frontend *fe, enum fe_status *status) 258 { 259 struct cx22700_state* state = fe->demodulator_priv; 260 261 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) 262 | (cx22700_readreg (state, 0x0e) << 1); 263 u8 sync = cx22700_readreg (state, 0x07); 264 265 *status = 0; 266 267 if (rs_ber < 0xff00) 268 *status |= FE_HAS_SIGNAL; 269 270 if (sync & 0x20) 271 *status |= FE_HAS_CARRIER; 272 273 if (sync & 0x10) 274 *status |= FE_HAS_VITERBI; 275 276 if (sync & 0x10) 277 *status |= FE_HAS_SYNC; 278 279 if (*status == 0x0f) 280 *status |= FE_HAS_LOCK; 281 282 return 0; 283 } 284 285 static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber) 286 { 287 struct cx22700_state* state = fe->demodulator_priv; 288 289 *ber = cx22700_readreg (state, 0x0c) & 0x7f; 290 cx22700_writereg (state, 0x0c, 0x00); 291 292 return 0; 293 } 294 295 static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) 296 { 297 struct cx22700_state* state = fe->demodulator_priv; 298 299 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) 300 | (cx22700_readreg (state, 0x0e) << 1); 301 *signal_strength = ~rs_ber; 302 303 return 0; 304 } 305 306 static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr) 307 { 308 struct cx22700_state* state = fe->demodulator_priv; 309 310 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) 311 | (cx22700_readreg (state, 0x0e) << 1); 312 *snr = ~rs_ber; 313 314 return 0; 315 } 316 317 static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) 318 { 319 struct cx22700_state* state = fe->demodulator_priv; 320 321 *ucblocks = cx22700_readreg (state, 0x0f); 322 cx22700_writereg (state, 0x0f, 0x00); 323 324 return 0; 325 } 326 327 static int cx22700_set_frontend(struct dvb_frontend *fe) 328 { 329 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 330 struct cx22700_state* state = fe->demodulator_priv; 331 332 cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/ 333 cx22700_writereg (state, 0x00, 0x00); 334 335 if (fe->ops.tuner_ops.set_params) { 336 fe->ops.tuner_ops.set_params(fe); 337 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); 338 } 339 340 cx22700_set_inversion(state, c->inversion); 341 cx22700_set_tps(state, c); 342 cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */ 343 cx22700_writereg (state, 0x00, 0x01); /* restart acquire */ 344 345 return 0; 346 } 347 348 static int cx22700_get_frontend(struct dvb_frontend *fe) 349 { 350 struct dtv_frontend_properties *c = &fe->dtv_property_cache; 351 struct cx22700_state* state = fe->demodulator_priv; 352 u8 reg09 = cx22700_readreg (state, 0x09); 353 354 c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF; 355 return cx22700_get_tps(state, c); 356 } 357 358 static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) 359 { 360 struct cx22700_state* state = fe->demodulator_priv; 361 362 if (enable) { 363 return cx22700_writereg(state, 0x0a, 0x00); 364 } else { 365 return cx22700_writereg(state, 0x0a, 0x01); 366 } 367 } 368 369 static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings) 370 { 371 fesettings->min_delay_ms = 150; 372 fesettings->step_size = 166667; 373 fesettings->max_drift = 166667*2; 374 return 0; 375 } 376 377 static void cx22700_release(struct dvb_frontend* fe) 378 { 379 struct cx22700_state* state = fe->demodulator_priv; 380 kfree(state); 381 } 382 383 static struct dvb_frontend_ops cx22700_ops; 384 385 struct dvb_frontend* cx22700_attach(const struct cx22700_config* config, 386 struct i2c_adapter* i2c) 387 { 388 struct cx22700_state* state = NULL; 389 390 /* allocate memory for the internal state */ 391 state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL); 392 if (state == NULL) goto error; 393 394 /* setup the state */ 395 state->config = config; 396 state->i2c = i2c; 397 398 /* check if the demod is there */ 399 if (cx22700_readreg(state, 0x07) < 0) goto error; 400 401 /* create dvb_frontend */ 402 memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops)); 403 state->frontend.demodulator_priv = state; 404 return &state->frontend; 405 406 error: 407 kfree(state); 408 return NULL; 409 } 410 411 static struct dvb_frontend_ops cx22700_ops = { 412 .delsys = { SYS_DVBT }, 413 .info = { 414 .name = "Conexant CX22700 DVB-T", 415 .frequency_min = 470000000, 416 .frequency_max = 860000000, 417 .frequency_stepsize = 166667, 418 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | 419 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | 420 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | 421 FE_CAN_RECOVER 422 }, 423 424 .release = cx22700_release, 425 426 .init = cx22700_init, 427 .i2c_gate_ctrl = cx22700_i2c_gate_ctrl, 428 429 .set_frontend = cx22700_set_frontend, 430 .get_frontend = cx22700_get_frontend, 431 .get_tune_settings = cx22700_get_tune_settings, 432 433 .read_status = cx22700_read_status, 434 .read_ber = cx22700_read_ber, 435 .read_signal_strength = cx22700_read_signal_strength, 436 .read_snr = cx22700_read_snr, 437 .read_ucblocks = cx22700_read_ucblocks, 438 }; 439 440 module_param(debug, int, 0644); 441 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 442 443 MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver"); 444 MODULE_AUTHOR("Holger Waechtler"); 445 MODULE_LICENSE("GPL"); 446 447 EXPORT_SYMBOL(cx22700_attach); 448