2 Conexant 22702 DVB OFDM demodulator driver
5 Alps TDMB7 DVB OFDM demodulator driver
7 Copyright (C) 2001-2002 Convergence Integrated Media GmbH
8 Holger Waechtler <holger@convergence.de>
10 Copyright (C) 2004 Steven Toth <steve@toth.demon.co.uk>
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 2 of the License, or
15 (at your option) any later version.
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <linux/kernel.h>
29 #include <linux/init.h>
30 #include <linux/module.h>
31 #include <linux/string.h>
32 #include <linux/slab.h>
33 #include <linux/delay.h>
34 #include "dvb_frontend.h"
39 struct cx22702_state {
41 struct i2c_adapter* i2c;
43 struct dvb_frontend_ops ops;
45 /* configuration settings */
46 const struct cx22702_config* config;
48 struct dvb_frontend frontend;
50 /* previous uncorrected block counter */
55 #define dprintk if (debug) printk
57 /* Register values to initialise the demod */
58 static u8 init_tab [] = {
59 0x00, 0x00, /* Stop aquisition */
87 static int cx22702_writereg (struct cx22702_state* state, u8 reg, u8 data)
90 u8 buf [] = { reg, data };
91 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
93 ret = i2c_transfer(state->i2c, &msg, 1);
96 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
97 __FUNCTION__, reg, data, ret);
99 return (ret != 1) ? -1 : 0;
102 static u8 cx22702_readreg (struct cx22702_state* state, u8 reg)
108 struct i2c_msg msg [] = {
109 { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
110 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
112 ret = i2c_transfer(state->i2c, msg, 2);
115 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
120 static int cx22702_set_inversion (struct cx22702_state *state, int inversion)
130 val = cx22702_readreg (state, 0x0C);
131 return cx22702_writereg (state, 0x0C, val | 0x01);
134 val = cx22702_readreg (state, 0x0C);
135 return cx22702_writereg (state, 0x0C, val & 0xfe);
144 /* Retrieve the demod settings */
145 static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *p)
149 /* Make sure the TPS regs are valid */
150 if (!(cx22702_readreg(state, 0x0A) & 0x20))
153 val = cx22702_readreg (state, 0x01);
154 switch( (val&0x18)>>3) {
155 case 0: p->constellation = QPSK; break;
156 case 1: p->constellation = QAM_16; break;
157 case 2: p->constellation = QAM_64; break;
160 case 0: p->hierarchy_information = HIERARCHY_NONE; break;
161 case 1: p->hierarchy_information = HIERARCHY_1; break;
162 case 2: p->hierarchy_information = HIERARCHY_2; break;
163 case 3: p->hierarchy_information = HIERARCHY_4; break;
167 val = cx22702_readreg (state, 0x02);
168 switch( (val&0x38)>>3 ) {
169 case 0: p->code_rate_HP = FEC_1_2; break;
170 case 1: p->code_rate_HP = FEC_2_3; break;
171 case 2: p->code_rate_HP = FEC_3_4; break;
172 case 3: p->code_rate_HP = FEC_5_6; break;
173 case 4: p->code_rate_HP = FEC_7_8; break;
176 case 0: p->code_rate_LP = FEC_1_2; break;
177 case 1: p->code_rate_LP = FEC_2_3; break;
178 case 2: p->code_rate_LP = FEC_3_4; break;
179 case 3: p->code_rate_LP = FEC_5_6; break;
180 case 4: p->code_rate_LP = FEC_7_8; break;
184 val = cx22702_readreg (state, 0x03);
185 switch( (val&0x0c)>>2 ) {
186 case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
187 case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
188 case 2: p->guard_interval = GUARD_INTERVAL_1_8; break;
189 case 3: p->guard_interval = GUARD_INTERVAL_1_4; break;
192 case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
193 case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
199 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
200 static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
203 struct cx22702_state* state = fe->demodulator_priv;
206 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) &0xfe);
207 if (state->config->pll_set) {
208 state->config->pll_set(fe, p);
209 } else if (state->config->pll_desc) {
211 struct i2c_msg msg = { .addr = state->config->pll_address,
212 .buf = pllbuf, .len = 4 };
213 dvb_pll_configure(state->config->pll_desc, pllbuf,
215 p->u.ofdm.bandwidth);
216 i2c_transfer(state->i2c, &msg, 1);
220 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
223 cx22702_set_inversion (state, p->inversion);
226 switch(p->u.ofdm.bandwidth) {
227 case BANDWIDTH_6_MHZ:
228 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
230 case BANDWIDTH_7_MHZ:
231 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
233 case BANDWIDTH_8_MHZ:
234 cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
237 dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
242 p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working
244 /* use auto configuration? */
245 if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
246 (p->u.ofdm.constellation==QAM_AUTO) ||
247 (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
248 (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
249 (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
250 (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) {
252 /* TPS Source - use hardware driven values */
253 cx22702_writereg(state, 0x06, 0x10);
254 cx22702_writereg(state, 0x07, 0x9);
255 cx22702_writereg(state, 0x08, 0xC1);
256 cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc );
257 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
258 cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
259 printk("%s: Autodetecting\n",__FUNCTION__);
263 /* manually programmed values */
265 switch(p->u.ofdm.constellation) {
266 case QPSK: val = (val&0xe7); break;
267 case QAM_16: val = (val&0xe7)|0x08; break;
268 case QAM_64: val = (val&0xe7)|0x10; break;
270 dprintk ("%s: invalid constellation\n",__FUNCTION__);
273 switch(p->u.ofdm.hierarchy_information) {
274 case HIERARCHY_NONE: val = (val&0xf8); break;
275 case HIERARCHY_1: val = (val&0xf8)|1; break;
276 case HIERARCHY_2: val = (val&0xf8)|2; break;
277 case HIERARCHY_4: val = (val&0xf8)|3; break;
279 dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
282 cx22702_writereg (state, 0x06, val);
285 switch(p->u.ofdm.code_rate_HP) {
287 case FEC_1_2: val = (val&0xc7); break;
288 case FEC_2_3: val = (val&0xc7)|0x08; break;
289 case FEC_3_4: val = (val&0xc7)|0x10; break;
290 case FEC_5_6: val = (val&0xc7)|0x18; break;
291 case FEC_7_8: val = (val&0xc7)|0x20; break;
293 dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
296 switch(p->u.ofdm.code_rate_LP) {
298 case FEC_1_2: val = (val&0xf8); break;
299 case FEC_2_3: val = (val&0xf8)|1; break;
300 case FEC_3_4: val = (val&0xf8)|2; break;
301 case FEC_5_6: val = (val&0xf8)|3; break;
302 case FEC_7_8: val = (val&0xf8)|4; break;
304 dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
307 cx22702_writereg (state, 0x07, val);
310 switch(p->u.ofdm.guard_interval) {
311 case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
312 case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
313 case GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
314 case GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
316 dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
319 switch(p->u.ofdm.transmission_mode) {
320 case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
321 case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
323 dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
326 cx22702_writereg(state, 0x08, val);
327 cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 );
328 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
330 /* Begin channel aquisition */
331 cx22702_writereg(state, 0x00, 0x01);
336 /* Reset the demod hardware and reset all of the configuration registers
337 to a default state. */
338 static int cx22702_init (struct dvb_frontend* fe)
341 struct cx22702_state* state = fe->demodulator_priv;
343 cx22702_writereg (state, 0x00, 0x02);
347 for (i=0; i<sizeof(init_tab); i+=2)
348 cx22702_writereg (state, init_tab[i], init_tab[i+1]);
352 if (state->config->pll_init) {
353 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) &0xfe);
354 state->config->pll_init(fe);
355 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
361 static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
363 struct cx22702_state* state = fe->demodulator_priv;
369 reg0A = cx22702_readreg (state, 0x0A);
370 reg23 = cx22702_readreg (state, 0x23);
372 dprintk ("%s: status demod=0x%02x agc=0x%02x\n"
373 ,__FUNCTION__,reg0A,reg23);
376 *status |= FE_HAS_LOCK;
377 *status |= FE_HAS_VITERBI;
378 *status |= FE_HAS_SYNC;
382 *status |= FE_HAS_CARRIER;
385 *status |= FE_HAS_SIGNAL;
390 static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber)
392 struct cx22702_state* state = fe->demodulator_priv;
394 if(cx22702_readreg (state, 0xE4) & 0x02) {
395 /* Realtime statistics */
396 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
397 | (cx22702_readreg (state, 0xDF)&0x7F);
399 /* Averagtine statistics */
400 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
401 | cx22702_readreg (state, 0xDF);
407 static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
409 struct cx22702_state* state = fe->demodulator_priv;
411 *signal_strength = cx22702_readreg (state, 0x23);
416 static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
418 struct cx22702_state* state = fe->demodulator_priv;
421 if(cx22702_readreg (state, 0xE4) & 0x02) {
422 /* Realtime statistics */
423 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
424 | (cx22702_readreg (state, 0xDF)& 0x7F);
426 /* Averagine statistics */
427 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8
428 | cx22702_readreg (state, 0xDF);
435 static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
437 struct cx22702_state* state = fe->demodulator_priv;
441 /* RS Uncorrectable Packet Count then reset */
442 _ucblocks = cx22702_readreg (state, 0xE3);
443 if (state->prevUCBlocks < _ucblocks) *ucblocks = (_ucblocks - state->prevUCBlocks);
444 else *ucblocks = state->prevUCBlocks - _ucblocks;
445 state->prevUCBlocks = _ucblocks;
450 static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
452 struct cx22702_state* state = fe->demodulator_priv;
454 u8 reg0C = cx22702_readreg (state, 0x0C);
456 p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
457 return cx22702_get_tps (state, &p->u.ofdm);
460 static void cx22702_release(struct dvb_frontend* fe)
462 struct cx22702_state* state = fe->demodulator_priv;
466 static struct dvb_frontend_ops cx22702_ops;
468 struct dvb_frontend* cx22702_attach(const struct cx22702_config* config,
469 struct i2c_adapter* i2c)
471 struct cx22702_state* state = NULL;
473 /* allocate memory for the internal state */
474 state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
475 if (state == NULL) goto error;
477 /* setup the state */
478 state->config = config;
480 memcpy(&state->ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
481 state->prevUCBlocks = 0;
483 /* check if the demod is there */
484 if (cx22702_readreg(state, 0x1f) != 0x3) goto error;
486 /* create dvb_frontend */
487 state->frontend.ops = &state->ops;
488 state->frontend.demodulator_priv = state;
489 return &state->frontend;
496 static struct dvb_frontend_ops cx22702_ops = {
499 .name = "Conexant CX22702 DVB-T",
501 .frequency_min = 177000000,
502 .frequency_max = 858000000,
503 .frequency_stepsize = 166666,
504 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
505 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
506 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
507 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
508 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
511 .release = cx22702_release,
513 .init = cx22702_init,
515 .set_frontend = cx22702_set_tps,
516 .get_frontend = cx22702_get_frontend,
518 .read_status = cx22702_read_status,
519 .read_ber = cx22702_read_ber,
520 .read_signal_strength = cx22702_read_signal_strength,
521 .read_snr = cx22702_read_snr,
522 .read_ucblocks = cx22702_read_ucblocks,
525 module_param(debug, int, 0644);
526 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
528 MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
529 MODULE_AUTHOR("Steven Toth");
530 MODULE_LICENSE("GPL");
532 EXPORT_SYMBOL(cx22702_attach);