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 32struct cx22700_state { 33 34 struct i2c_adapter* i2c; 35 36 const struct cx22700_config* config; 37 38 struct dvb_frontend frontend; 39}; 40 41 42static int debug; 43#define dprintk(args...) \ 44 do { \ 45 if (debug) printk(KERN_DEBUG "cx22700: " args); \ 46 } while (0) 47 48static 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 70static 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 87static 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 104static 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 124static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p) 125{ 126 static const u8 qam_tab [4] = { 0, 1, 0, 2 }; 127 static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 }; 128 u8 val; 129 130 dprintk ("%s\n", __func__); 131 132 if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8) 133 return -EINVAL; 134 135 if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8) 136 return -EINVAL; 137 138 if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5) 139 return -EINVAL; 140 141 if (p->guard_interval < GUARD_INTERVAL_1_32 || 142 p->guard_interval > GUARD_INTERVAL_1_4) 143 return -EINVAL; 144 145 if (p->transmission_mode != TRANSMISSION_MODE_2K && 146 p->transmission_mode != TRANSMISSION_MODE_8K) 147 return -EINVAL; 148 149 if (p->constellation != QPSK && 150 p->constellation != QAM_16 && 151 p->constellation != QAM_64) 152 return -EINVAL; 153 154 if (p->hierarchy_information < HIERARCHY_NONE || 155 p->hierarchy_information > HIERARCHY_4) 156 return -EINVAL; 157 158 if (p->bandwidth < BANDWIDTH_8_MHZ || p->bandwidth > BANDWIDTH_6_MHZ) 159 return -EINVAL; 160 161 if (p->bandwidth == BANDWIDTH_7_MHZ) 162 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10)); 163 else 164 cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10)); 165 166 val = qam_tab[p->constellation - QPSK]; 167 val |= p->hierarchy_information - HIERARCHY_NONE; 168 169 cx22700_writereg (state, 0x04, val); 170 171 val = fec_tab[p->code_rate_HP - FEC_1_2] << 3; 172 val |= fec_tab[p->code_rate_LP - FEC_1_2]; 173 174 cx22700_writereg (state, 0x05, val); 175 176 val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2; 177 val |= p->transmission_mode - TRANSMISSION_MODE_2K; 178 179 cx22700_writereg (state, 0x06, val); 180 181 cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */ 182 cx22700_writereg (state, 0x08, 0x04); /* restart aquisition */ 183 184 return 0; 185} 186 187static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p) 188{ 189 static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 }; 190 static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4, 191 FEC_5_6, FEC_7_8 }; 192 u8 val; 193 194 dprintk ("%s\n", __func__); 195 196 if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */ 197 return -EAGAIN; 198 199 val = cx22700_readreg (state, 0x01); 200 201 if ((val & 0x7) > 4) 202 p->hierarchy_information = HIERARCHY_AUTO; 203 else 204 p->hierarchy_information = HIERARCHY_NONE + (val & 0x7); 205 206 if (((val >> 3) & 0x3) > 2) 207 p->constellation = QAM_AUTO; 208 else 209 p->constellation = qam_tab[(val >> 3) & 0x3]; 210 211 val = cx22700_readreg (state, 0x02); 212 213 if (((val >> 3) & 0x07) > 4) 214 p->code_rate_HP = FEC_AUTO; 215 else 216 p->code_rate_HP = fec_tab[(val >> 3) & 0x07]; 217 218 if ((val & 0x07) > 4) 219 p->code_rate_LP = FEC_AUTO; 220 else 221 p->code_rate_LP = fec_tab[val & 0x07]; 222 223 val = cx22700_readreg (state, 0x03); 224 225 p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3); 226 p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1); 227 228 return 0; 229} 230 231static int cx22700_init (struct dvb_frontend* fe) 232 233{ struct cx22700_state* state = fe->demodulator_priv; 234 int i; 235 236 dprintk("cx22700_init: init chip\n"); 237 238 cx22700_writereg (state, 0x00, 0x02); /* soft reset */ 239 cx22700_writereg (state, 0x00, 0x00); 240 241 msleep(10); 242 243 for (i=0; i<sizeof(init_tab); i+=2) 244 cx22700_writereg (state, init_tab[i], init_tab[i+1]); 245 246 cx22700_writereg (state, 0x00, 0x01); 247 248 return 0; 249} 250 251static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status) 252{ 253 struct cx22700_state* state = fe->demodulator_priv; 254 255 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) 256 | (cx22700_readreg (state, 0x0e) << 1); 257 u8 sync = cx22700_readreg (state, 0x07); 258 259 *status = 0; 260 261 if (rs_ber < 0xff00) 262 *status |= FE_HAS_SIGNAL; 263 264 if (sync & 0x20) 265 *status |= FE_HAS_CARRIER; 266 267 if (sync & 0x10) 268 *status |= FE_HAS_VITERBI; 269 270 if (sync & 0x10) 271 *status |= FE_HAS_SYNC; 272 273 if (*status == 0x0f) 274 *status |= FE_HAS_LOCK; 275 276 return 0; 277} 278 279static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber) 280{ 281 struct cx22700_state* state = fe->demodulator_priv; 282 283 *ber = cx22700_readreg (state, 0x0c) & 0x7f; 284 cx22700_writereg (state, 0x0c, 0x00); 285 286 return 0; 287} 288 289static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength) 290{ 291 struct cx22700_state* state = fe->demodulator_priv; 292 293 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) 294 | (cx22700_readreg (state, 0x0e) << 1); 295 *signal_strength = ~rs_ber; 296 297 return 0; 298} 299 300static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr) 301{ 302 struct cx22700_state* state = fe->demodulator_priv; 303 304 u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9) 305 | (cx22700_readreg (state, 0x0e) << 1); 306 *snr = ~rs_ber; 307 308 return 0; 309} 310 311static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks) 312{ 313 struct cx22700_state* state = fe->demodulator_priv; 314 315 *ucblocks = cx22700_readreg (state, 0x0f); 316 cx22700_writereg (state, 0x0f, 0x00); 317 318 return 0; 319} 320 321static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p) 322{ 323 struct cx22700_state* state = fe->demodulator_priv; 324 325 cx22700_writereg (state, 0x00, 0x02); 326 cx22700_writereg (state, 0x00, 0x00); 327 328 if (fe->ops.tuner_ops.set_params) { 329 fe->ops.tuner_ops.set_params(fe, p); 330 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0); 331 } 332 333 cx22700_set_inversion (state, p->inversion); 334 cx22700_set_tps (state, &p->u.ofdm); 335 cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */ 336 cx22700_writereg (state, 0x00, 0x01); /* restart acquire */ 337 338 return 0; 339} 340 341static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p) 342{ 343 struct cx22700_state* state = fe->demodulator_priv; 344 u8 reg09 = cx22700_readreg (state, 0x09); 345 346 p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF; 347 return cx22700_get_tps (state, &p->u.ofdm); 348} 349 350static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable) 351{ 352 struct cx22700_state* state = fe->demodulator_priv; 353 354 if (enable) { 355 return cx22700_writereg(state, 0x0a, 0x00); 356 } else { 357 return cx22700_writereg(state, 0x0a, 0x01); 358 } 359} 360 361static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings) 362{ 363 fesettings->min_delay_ms = 150; 364 fesettings->step_size = 166667; 365 fesettings->max_drift = 166667*2; 366 return 0; 367} 368 369static void cx22700_release(struct dvb_frontend* fe) 370{ 371 struct cx22700_state* state = fe->demodulator_priv; 372 kfree(state); 373} 374 375static struct dvb_frontend_ops cx22700_ops; 376 377struct dvb_frontend* cx22700_attach(const struct cx22700_config* config, 378 struct i2c_adapter* i2c) 379{ 380 struct cx22700_state* state = NULL; 381 382 /* allocate memory for the internal state */ 383 state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL); 384 if (state == NULL) goto error; 385 386 /* setup the state */ 387 state->config = config; 388 state->i2c = i2c; 389 390 /* check if the demod is there */ 391 if (cx22700_readreg(state, 0x07) < 0) goto error; 392 393 /* create dvb_frontend */ 394 memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops)); 395 state->frontend.demodulator_priv = state; 396 return &state->frontend; 397 398error: 399 kfree(state); 400 return NULL; 401} 402 403static struct dvb_frontend_ops cx22700_ops = { 404 405 .info = { 406 .name = "Conexant CX22700 DVB-T", 407 .type = FE_OFDM, 408 .frequency_min = 470000000, 409 .frequency_max = 860000000, 410 .frequency_stepsize = 166667, 411 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 | 412 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO | 413 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | 414 FE_CAN_RECOVER 415 }, 416 417 .release = cx22700_release, 418 419 .init = cx22700_init, 420 .i2c_gate_ctrl = cx22700_i2c_gate_ctrl, 421 422 .set_frontend = cx22700_set_frontend, 423 .get_frontend = cx22700_get_frontend, 424 .get_tune_settings = cx22700_get_tune_settings, 425 426 .read_status = cx22700_read_status, 427 .read_ber = cx22700_read_ber, 428 .read_signal_strength = cx22700_read_signal_strength, 429 .read_snr = cx22700_read_snr, 430 .read_ucblocks = cx22700_read_ucblocks, 431}; 432 433module_param(debug, int, 0644); 434MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); 435 436MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver"); 437MODULE_AUTHOR("Holger Waechtler"); 438MODULE_LICENSE("GPL"); 439 440EXPORT_SYMBOL(cx22700_attach); 441