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 <stoth@linuxtv.org>
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"
37 struct cx22702_state {
39 struct i2c_adapter *i2c;
41 /* configuration settings */
42 const struct cx22702_config *config;
44 struct dvb_frontend frontend;
46 /* previous uncorrected block counter */
51 module_param(debug, int, 0644);
52 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
54 #define dprintk if (debug) printk
56 /* Register values to initialise the demod */
57 static u8 init_tab[] = {
58 0x00, 0x00, /* Stop aquisition */
85 static int cx22702_writereg(struct cx22702_state *state, u8 reg, u8 data)
88 u8 buf[] = { reg, data };
89 struct i2c_msg msg = {
90 .addr = state->config->demod_address, .flags = 0,
91 .buf = buf, .len = 2 };
93 ret = i2c_transfer(state->i2c, &msg, 1);
97 "%s: error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
98 __func__, reg, data, ret);
100 return (ret != 1) ? -1 : 0;
103 static u8 cx22702_readreg(struct cx22702_state *state, u8 reg)
109 struct i2c_msg msg[] = {
110 { .addr = state->config->demod_address, .flags = 0,
111 .buf = b0, .len = 1 },
112 { .addr = state->config->demod_address, .flags = I2C_M_RD,
113 .buf = b1, .len = 1 } };
115 ret = i2c_transfer(state->i2c, msg, 2);
118 printk(KERN_ERR "%s: readreg error (ret == %i)\n",
124 static int cx22702_set_inversion(struct cx22702_state *state, int inversion)
132 val = cx22702_readreg(state, 0x0C);
133 return cx22702_writereg(state, 0x0C, val | 0x01);
135 val = cx22702_readreg(state, 0x0C);
136 return cx22702_writereg(state, 0x0C, val & 0xfe);
143 /* Retrieve the demod settings */
144 static int cx22702_get_tps(struct cx22702_state *state,
145 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) {
156 p->constellation = QPSK;
159 p->constellation = QAM_16;
162 p->constellation = QAM_64;
165 switch (val & 0x07) {
167 p->hierarchy_information = HIERARCHY_NONE;
170 p->hierarchy_information = HIERARCHY_1;
173 p->hierarchy_information = HIERARCHY_2;
176 p->hierarchy_information = HIERARCHY_4;
181 val = cx22702_readreg(state, 0x02);
182 switch ((val & 0x38) >> 3) {
184 p->code_rate_HP = FEC_1_2;
187 p->code_rate_HP = FEC_2_3;
190 p->code_rate_HP = FEC_3_4;
193 p->code_rate_HP = FEC_5_6;
196 p->code_rate_HP = FEC_7_8;
199 switch (val & 0x07) {
201 p->code_rate_LP = FEC_1_2;
204 p->code_rate_LP = FEC_2_3;
207 p->code_rate_LP = FEC_3_4;
210 p->code_rate_LP = FEC_5_6;
213 p->code_rate_LP = FEC_7_8;
217 val = cx22702_readreg(state, 0x03);
218 switch ((val & 0x0c) >> 2) {
220 p->guard_interval = GUARD_INTERVAL_1_32;
223 p->guard_interval = GUARD_INTERVAL_1_16;
226 p->guard_interval = GUARD_INTERVAL_1_8;
229 p->guard_interval = GUARD_INTERVAL_1_4;
232 switch (val & 0x03) {
234 p->transmission_mode = TRANSMISSION_MODE_2K;
237 p->transmission_mode = TRANSMISSION_MODE_8K;
244 static int cx22702_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
246 struct cx22702_state *state = fe->demodulator_priv;
247 dprintk("%s(%d)\n", __func__, enable);
249 return cx22702_writereg(state, 0x0D,
250 cx22702_readreg(state, 0x0D) & 0xfe);
252 return cx22702_writereg(state, 0x0D,
253 cx22702_readreg(state, 0x0D) | 1);
256 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
257 static int cx22702_set_tps(struct dvb_frontend *fe,
258 struct dvb_frontend_parameters *p)
261 struct cx22702_state *state = fe->demodulator_priv;
263 if (fe->ops.tuner_ops.set_params) {
264 fe->ops.tuner_ops.set_params(fe, p);
265 if (fe->ops.i2c_gate_ctrl)
266 fe->ops.i2c_gate_ctrl(fe, 0);
270 cx22702_set_inversion(state, p->inversion);
273 switch (p->u.ofdm.bandwidth) {
274 case BANDWIDTH_6_MHZ:
275 cx22702_writereg(state, 0x0C,
276 (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20);
278 case BANDWIDTH_7_MHZ:
279 cx22702_writereg(state, 0x0C,
280 (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10);
282 case BANDWIDTH_8_MHZ:
283 cx22702_writereg(state, 0x0C,
284 cx22702_readreg(state, 0x0C) & 0xcf);
287 dprintk("%s: invalid bandwidth\n", __func__);
291 p->u.ofdm.code_rate_LP = FEC_AUTO; /* temp hack as manual not working */
293 /* use auto configuration? */
294 if ((p->u.ofdm.hierarchy_information == HIERARCHY_AUTO) ||
295 (p->u.ofdm.constellation == QAM_AUTO) ||
296 (p->u.ofdm.code_rate_HP == FEC_AUTO) ||
297 (p->u.ofdm.code_rate_LP == FEC_AUTO) ||
298 (p->u.ofdm.guard_interval == GUARD_INTERVAL_AUTO) ||
299 (p->u.ofdm.transmission_mode == TRANSMISSION_MODE_AUTO)) {
301 /* TPS Source - use hardware driven values */
302 cx22702_writereg(state, 0x06, 0x10);
303 cx22702_writereg(state, 0x07, 0x9);
304 cx22702_writereg(state, 0x08, 0xC1);
305 cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B)
307 cx22702_writereg(state, 0x0C,
308 (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40);
309 cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
310 dprintk("%s: Autodetecting\n", __func__);
314 /* manually programmed values */
316 switch (p->u.ofdm.constellation) {
321 val = (val & 0xe7) | 0x08;
324 val = (val & 0xe7) | 0x10;
327 dprintk("%s: invalid constellation\n", __func__);
330 switch (p->u.ofdm.hierarchy_information) {
335 val = (val & 0xf8) | 1;
338 val = (val & 0xf8) | 2;
341 val = (val & 0xf8) | 3;
344 dprintk("%s: invalid hierarchy\n", __func__);
347 cx22702_writereg(state, 0x06, val);
350 switch (p->u.ofdm.code_rate_HP) {
356 val = (val & 0xc7) | 0x08;
359 val = (val & 0xc7) | 0x10;
362 val = (val & 0xc7) | 0x18;
365 val = (val & 0xc7) | 0x20;
368 dprintk("%s: invalid code_rate_HP\n", __func__);
371 switch (p->u.ofdm.code_rate_LP) {
377 val = (val & 0xf8) | 1;
380 val = (val & 0xf8) | 2;
383 val = (val & 0xf8) | 3;
386 val = (val & 0xf8) | 4;
389 dprintk("%s: invalid code_rate_LP\n", __func__);
392 cx22702_writereg(state, 0x07, val);
395 switch (p->u.ofdm.guard_interval) {
396 case GUARD_INTERVAL_1_32:
399 case GUARD_INTERVAL_1_16:
400 val = (val & 0xf3) | 0x04;
402 case GUARD_INTERVAL_1_8:
403 val = (val & 0xf3) | 0x08;
405 case GUARD_INTERVAL_1_4:
406 val = (val & 0xf3) | 0x0c;
409 dprintk("%s: invalid guard_interval\n", __func__);
412 switch (p->u.ofdm.transmission_mode) {
413 case TRANSMISSION_MODE_2K:
416 case TRANSMISSION_MODE_8K:
417 val = (val & 0xfc) | 1;
420 dprintk("%s: invalid transmission_mode\n", __func__);
423 cx22702_writereg(state, 0x08, val);
424 cx22702_writereg(state, 0x0B,
425 (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02);
426 cx22702_writereg(state, 0x0C,
427 (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40);
429 /* Begin channel aquisition */
430 cx22702_writereg(state, 0x00, 0x01);
435 /* Reset the demod hardware and reset all of the configuration registers
436 to a default state. */
437 static int cx22702_init(struct dvb_frontend *fe)
440 struct cx22702_state *state = fe->demodulator_priv;
442 cx22702_writereg(state, 0x00, 0x02);
446 for (i = 0; i < ARRAY_SIZE(init_tab); i += 2)
447 cx22702_writereg(state, init_tab[i], init_tab[i + 1]);
449 cx22702_writereg(state, 0xf8, (state->config->output_mode << 1)
452 cx22702_i2c_gate_ctrl(fe, 0);
457 static int cx22702_read_status(struct dvb_frontend *fe, fe_status_t *status)
459 struct cx22702_state *state = fe->demodulator_priv;
465 reg0A = cx22702_readreg(state, 0x0A);
466 reg23 = cx22702_readreg(state, 0x23);
468 dprintk("%s: status demod=0x%02x agc=0x%02x\n"
469 , __func__, reg0A, reg23);
472 *status |= FE_HAS_LOCK;
473 *status |= FE_HAS_VITERBI;
474 *status |= FE_HAS_SYNC;
478 *status |= FE_HAS_CARRIER;
481 *status |= FE_HAS_SIGNAL;
486 static int cx22702_read_ber(struct dvb_frontend *fe, u32 *ber)
488 struct cx22702_state *state = fe->demodulator_priv;
490 if (cx22702_readreg(state, 0xE4) & 0x02) {
491 /* Realtime statistics */
492 *ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7
493 | (cx22702_readreg(state, 0xDF) & 0x7F);
495 /* Averagtine statistics */
496 *ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7
497 | cx22702_readreg(state, 0xDF);
503 static int cx22702_read_signal_strength(struct dvb_frontend *fe,
504 u16 *signal_strength)
506 struct cx22702_state *state = fe->demodulator_priv;
509 rs_ber = cx22702_readreg(state, 0x23);
510 *signal_strength = (rs_ber << 8) | rs_ber;
515 static int cx22702_read_snr(struct dvb_frontend *fe, u16 *snr)
517 struct cx22702_state *state = fe->demodulator_priv;
520 if (cx22702_readreg(state, 0xE4) & 0x02) {
521 /* Realtime statistics */
522 rs_ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 7
523 | (cx22702_readreg(state, 0xDF) & 0x7F);
525 /* Averagine statistics */
526 rs_ber = (cx22702_readreg(state, 0xDE) & 0x7F) << 8
527 | cx22702_readreg(state, 0xDF);
534 static int cx22702_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
536 struct cx22702_state *state = fe->demodulator_priv;
540 /* RS Uncorrectable Packet Count then reset */
541 _ucblocks = cx22702_readreg(state, 0xE3);
542 if (state->prevUCBlocks < _ucblocks)
543 *ucblocks = (_ucblocks - state->prevUCBlocks);
545 *ucblocks = state->prevUCBlocks - _ucblocks;
546 state->prevUCBlocks = _ucblocks;
551 static int cx22702_get_frontend(struct dvb_frontend *fe,
552 struct dvb_frontend_parameters *p)
554 struct cx22702_state *state = fe->demodulator_priv;
556 u8 reg0C = cx22702_readreg(state, 0x0C);
558 p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
559 return cx22702_get_tps(state, &p->u.ofdm);
562 static int cx22702_get_tune_settings(struct dvb_frontend *fe,
563 struct dvb_frontend_tune_settings *tune)
565 tune->min_delay_ms = 1000;
569 static void cx22702_release(struct dvb_frontend *fe)
571 struct cx22702_state *state = fe->demodulator_priv;
575 static struct dvb_frontend_ops cx22702_ops;
577 struct dvb_frontend *cx22702_attach(const struct cx22702_config *config,
578 struct i2c_adapter *i2c)
580 struct cx22702_state *state = NULL;
582 /* allocate memory for the internal state */
583 state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
587 /* setup the state */
588 state->config = config;
590 state->prevUCBlocks = 0;
592 /* check if the demod is there */
593 if (cx22702_readreg(state, 0x1f) != 0x3)
596 /* create dvb_frontend */
597 memcpy(&state->frontend.ops, &cx22702_ops,
598 sizeof(struct dvb_frontend_ops));
599 state->frontend.demodulator_priv = state;
600 return &state->frontend;
606 EXPORT_SYMBOL(cx22702_attach);
608 static struct dvb_frontend_ops cx22702_ops = {
611 .name = "Conexant CX22702 DVB-T",
613 .frequency_min = 177000000,
614 .frequency_max = 858000000,
615 .frequency_stepsize = 166666,
616 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
617 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
618 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
619 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
620 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
623 .release = cx22702_release,
625 .init = cx22702_init,
626 .i2c_gate_ctrl = cx22702_i2c_gate_ctrl,
628 .set_frontend = cx22702_set_tps,
629 .get_frontend = cx22702_get_frontend,
630 .get_tune_settings = cx22702_get_tune_settings,
632 .read_status = cx22702_read_status,
633 .read_ber = cx22702_read_ber,
634 .read_signal_strength = cx22702_read_signal_strength,
635 .read_snr = cx22702_read_snr,
636 .read_ucblocks = cx22702_read_ucblocks,
639 MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
640 MODULE_AUTHOR("Steven Toth");
641 MODULE_LICENSE("GPL");