blob: 335219ebce2d5a5568dc6d815ffe8aaf3ac185c6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 Conexant 22702 DVB OFDM demodulator driver
3
4 based on:
Mauro Carvalho Chehab9101e622005-12-12 00:37:24 -08005 Alps TDMB7 DVB OFDM demodulator driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7 Copyright (C) 2001-2002 Convergence Integrated Media GmbH
8 Holger Waechtler <holger@convergence.de>
9
Steven Toth9b9225f2005-12-01 00:51:53 -080010 Copyright (C) 2004 Steven Toth <stoth@hauppauge.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
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.
16
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.
21
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.
25
26*/
27
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"
Gerd Knorr9990d742005-05-01 08:59:20 -070035#include "dvb-pll.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "cx22702.h"
37
38
39struct cx22702_state {
40
41 struct i2c_adapter* i2c;
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 /* configuration settings */
44 const struct cx22702_config* config;
45
46 struct dvb_frontend frontend;
47
48 /* previous uncorrected block counter */
49 u8 prevUCBlocks;
50};
51
52static int debug = 0;
53#define dprintk if (debug) printk
54
55/* Register values to initialise the demod */
56static u8 init_tab [] = {
57 0x00, 0x00, /* Stop aquisition */
58 0x0B, 0x06,
59 0x09, 0x01,
60 0x0D, 0x41,
61 0x16, 0x32,
62 0x20, 0x0A,
63 0x21, 0x17,
64 0x24, 0x3e,
65 0x26, 0xff,
66 0x27, 0x10,
67 0x28, 0x00,
68 0x29, 0x00,
69 0x2a, 0x10,
70 0x2b, 0x00,
71 0x2c, 0x10,
72 0x2d, 0x00,
73 0x48, 0xd4,
74 0x49, 0x56,
75 0x6b, 0x1e,
76 0xc8, 0x02,
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 0xf9, 0x00,
78 0xfa, 0x00,
79 0xfb, 0x00,
80 0xfc, 0x00,
81 0xfd, 0x00,
82};
83
84static int cx22702_writereg (struct cx22702_state* state, u8 reg, u8 data)
85{
86 int ret;
87 u8 buf [] = { reg, data };
88 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
89
90 ret = i2c_transfer(state->i2c, &msg, 1);
91
92 if (ret != 1)
93 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
94 __FUNCTION__, reg, data, ret);
95
96 return (ret != 1) ? -1 : 0;
97}
98
99static u8 cx22702_readreg (struct cx22702_state* state, u8 reg)
100{
101 int ret;
102 u8 b0 [] = { reg };
103 u8 b1 [] = { 0 };
104
105 struct i2c_msg msg [] = {
106 { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
107 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
108
109 ret = i2c_transfer(state->i2c, msg, 2);
110
111 if (ret != 2)
112 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
113
114 return b1[0];
115}
116
117static int cx22702_set_inversion (struct cx22702_state *state, int inversion)
118{
119 u8 val;
120
121 switch (inversion) {
122
123 case INVERSION_AUTO:
124 return -EOPNOTSUPP;
125
126 case INVERSION_ON:
127 val = cx22702_readreg (state, 0x0C);
128 return cx22702_writereg (state, 0x0C, val | 0x01);
129
130 case INVERSION_OFF:
131 val = cx22702_readreg (state, 0x0C);
132 return cx22702_writereg (state, 0x0C, val & 0xfe);
133
134 default:
135 return -EINVAL;
136
137 }
138
139}
140
141/* Retrieve the demod settings */
142static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *p)
143{
144 u8 val;
145
146 /* Make sure the TPS regs are valid */
147 if (!(cx22702_readreg(state, 0x0A) & 0x20))
148 return -EAGAIN;
149
150 val = cx22702_readreg (state, 0x01);
151 switch( (val&0x18)>>3) {
152 case 0: p->constellation = QPSK; break;
153 case 1: p->constellation = QAM_16; break;
154 case 2: p->constellation = QAM_64; break;
155 }
156 switch( val&0x07 ) {
157 case 0: p->hierarchy_information = HIERARCHY_NONE; break;
158 case 1: p->hierarchy_information = HIERARCHY_1; break;
159 case 2: p->hierarchy_information = HIERARCHY_2; break;
160 case 3: p->hierarchy_information = HIERARCHY_4; break;
161 }
162
163
164 val = cx22702_readreg (state, 0x02);
165 switch( (val&0x38)>>3 ) {
166 case 0: p->code_rate_HP = FEC_1_2; break;
167 case 1: p->code_rate_HP = FEC_2_3; break;
168 case 2: p->code_rate_HP = FEC_3_4; break;
169 case 3: p->code_rate_HP = FEC_5_6; break;
170 case 4: p->code_rate_HP = FEC_7_8; break;
171 }
172 switch( val&0x07 ) {
173 case 0: p->code_rate_LP = FEC_1_2; break;
174 case 1: p->code_rate_LP = FEC_2_3; break;
175 case 2: p->code_rate_LP = FEC_3_4; break;
176 case 3: p->code_rate_LP = FEC_5_6; break;
177 case 4: p->code_rate_LP = FEC_7_8; break;
178 }
179
180
181 val = cx22702_readreg (state, 0x03);
182 switch( (val&0x0c)>>2 ) {
183 case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
184 case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
185 case 2: p->guard_interval = GUARD_INTERVAL_1_8; break;
186 case 3: p->guard_interval = GUARD_INTERVAL_1_4; break;
187 }
188 switch( val&0x03 ) {
189 case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
190 case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
191 }
192
193 return 0;
194}
195
Steven Toth611900c2006-01-09 15:25:12 -0200196static int cx22702_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
197{
198 struct cx22702_state* state = fe->demodulator_priv;
199 dprintk ("%s(%d)\n", __FUNCTION__, enable);
200 if (enable)
201 return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) & 0xfe);
202 else
203 return cx22702_writereg (state, 0x0D, cx22702_readreg(state, 0x0D) | 1);
204}
205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
207static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
208{
209 u8 val;
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700210 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Patrick Boettcherdea74862006-05-14 05:01:31 -0300212 if (fe->ops.tuner_ops.set_params) {
213 fe->ops.tuner_ops.set_params(fe, p);
214 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
Gerd Knorr9990d742005-05-01 08:59:20 -0700215 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216
217 /* set inversion */
218 cx22702_set_inversion (state, p->inversion);
219
220 /* set bandwidth */
221 switch(p->u.ofdm.bandwidth) {
222 case BANDWIDTH_6_MHZ:
223 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
224 break;
225 case BANDWIDTH_7_MHZ:
226 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
227 break;
228 case BANDWIDTH_8_MHZ:
229 cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
230 break;
231 default:
232 dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
233 return -EINVAL;
234 }
235
236
237 p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working
238
239 /* use auto configuration? */
240 if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
241 (p->u.ofdm.constellation==QAM_AUTO) ||
242 (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
243 (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
244 (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
245 (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) {
246
247 /* TPS Source - use hardware driven values */
248 cx22702_writereg(state, 0x06, 0x10);
249 cx22702_writereg(state, 0x07, 0x9);
250 cx22702_writereg(state, 0x08, 0xC1);
251 cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc );
252 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
253 cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700254 dprintk("%s: Autodetecting\n",__FUNCTION__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 return 0;
256 }
257
258 /* manually programmed values */
259 val=0;
260 switch(p->u.ofdm.constellation) {
261 case QPSK: val = (val&0xe7); break;
262 case QAM_16: val = (val&0xe7)|0x08; break;
263 case QAM_64: val = (val&0xe7)|0x10; break;
264 default:
265 dprintk ("%s: invalid constellation\n",__FUNCTION__);
266 return -EINVAL;
267 }
268 switch(p->u.ofdm.hierarchy_information) {
269 case HIERARCHY_NONE: val = (val&0xf8); break;
270 case HIERARCHY_1: val = (val&0xf8)|1; break;
271 case HIERARCHY_2: val = (val&0xf8)|2; break;
272 case HIERARCHY_4: val = (val&0xf8)|3; break;
273 default:
274 dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
275 return -EINVAL;
276 }
277 cx22702_writereg (state, 0x06, val);
278
279 val=0;
280 switch(p->u.ofdm.code_rate_HP) {
281 case FEC_NONE:
282 case FEC_1_2: val = (val&0xc7); break;
283 case FEC_2_3: val = (val&0xc7)|0x08; break;
284 case FEC_3_4: val = (val&0xc7)|0x10; break;
285 case FEC_5_6: val = (val&0xc7)|0x18; break;
286 case FEC_7_8: val = (val&0xc7)|0x20; break;
287 default:
288 dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
289 return -EINVAL;
290 }
291 switch(p->u.ofdm.code_rate_LP) {
292 case FEC_NONE:
293 case FEC_1_2: val = (val&0xf8); break;
294 case FEC_2_3: val = (val&0xf8)|1; break;
295 case FEC_3_4: val = (val&0xf8)|2; break;
296 case FEC_5_6: val = (val&0xf8)|3; break;
297 case FEC_7_8: val = (val&0xf8)|4; break;
298 default:
299 dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
300 return -EINVAL;
301 }
302 cx22702_writereg (state, 0x07, val);
303
304 val=0;
305 switch(p->u.ofdm.guard_interval) {
306 case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
307 case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
308 case GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
309 case GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
310 default:
311 dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
312 return -EINVAL;
313 }
314 switch(p->u.ofdm.transmission_mode) {
315 case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
316 case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
317 default:
318 dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
319 return -EINVAL;
320 }
321 cx22702_writereg(state, 0x08, val);
322 cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 );
323 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
324
325 /* Begin channel aquisition */
326 cx22702_writereg(state, 0x00, 0x01);
327
328 return 0;
329}
330
331/* Reset the demod hardware and reset all of the configuration registers
332 to a default state. */
333static int cx22702_init (struct dvb_frontend* fe)
334{
335 int i;
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700336 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 cx22702_writereg (state, 0x00, 0x02);
339
340 msleep(10);
341
342 for (i=0; i<sizeof(init_tab); i+=2)
343 cx22702_writereg (state, init_tab[i], init_tab[i+1]);
344
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700345 cx22702_writereg (state, 0xf8, (state->config->output_mode << 1) & 0x02);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Steven Toth611900c2006-01-09 15:25:12 -0200347 cx22702_i2c_gate_ctrl(fe, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 return 0;
350}
351
352static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
353{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700354 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 u8 reg0A;
356 u8 reg23;
357
358 *status = 0;
359
360 reg0A = cx22702_readreg (state, 0x0A);
361 reg23 = cx22702_readreg (state, 0x23);
362
363 dprintk ("%s: status demod=0x%02x agc=0x%02x\n"
364 ,__FUNCTION__,reg0A,reg23);
365
366 if(reg0A & 0x10) {
367 *status |= FE_HAS_LOCK;
368 *status |= FE_HAS_VITERBI;
369 *status |= FE_HAS_SYNC;
370 }
371
372 if(reg0A & 0x20)
373 *status |= FE_HAS_CARRIER;
374
375 if(reg23 < 0xf0)
376 *status |= FE_HAS_SIGNAL;
377
378 return 0;
379}
380
381static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber)
382{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700383 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385 if(cx22702_readreg (state, 0xE4) & 0x02) {
386 /* Realtime statistics */
387 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
388 | (cx22702_readreg (state, 0xDF)&0x7F);
389 } else {
390 /* Averagtine statistics */
391 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
392 | cx22702_readreg (state, 0xDF);
393 }
394
395 return 0;
396}
397
398static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
399{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700400 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Bradley Kite1e9dadb2006-09-02 21:14:27 -0300402 u16 rs_ber = 0;
403 rs_ber = cx22702_readreg (state, 0x23);
404 *signal_strength = (rs_ber << 8) | rs_ber;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 return 0;
407}
408
409static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
410{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700411 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
413 u16 rs_ber=0;
414 if(cx22702_readreg (state, 0xE4) & 0x02) {
415 /* Realtime statistics */
416 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
417 | (cx22702_readreg (state, 0xDF)& 0x7F);
418 } else {
419 /* Averagine statistics */
420 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8
421 | cx22702_readreg (state, 0xDF);
422 }
423 *snr = ~rs_ber;
424
425 return 0;
426}
427
428static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
429{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700430 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 u8 _ucblocks;
433
434 /* RS Uncorrectable Packet Count then reset */
435 _ucblocks = cx22702_readreg (state, 0xE3);
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700436 if (state->prevUCBlocks < _ucblocks)
437 *ucblocks = (_ucblocks - state->prevUCBlocks);
438 else
439 *ucblocks = state->prevUCBlocks - _ucblocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 state->prevUCBlocks = _ucblocks;
441
442 return 0;
443}
444
445static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
446{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700447 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
449 u8 reg0C = cx22702_readreg (state, 0x0C);
450
451 p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
452 return cx22702_get_tps (state, &p->u.ofdm);
453}
454
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700455static int cx22702_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
456{
457 tune->min_delay_ms = 1000;
458 return 0;
459}
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461static void cx22702_release(struct dvb_frontend* fe)
462{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700463 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 kfree(state);
465}
466
467static struct dvb_frontend_ops cx22702_ops;
468
469struct dvb_frontend* cx22702_attach(const struct cx22702_config* config,
470 struct i2c_adapter* i2c)
471{
472 struct cx22702_state* state = NULL;
473
474 /* allocate memory for the internal state */
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700475 state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700476 if (state == NULL)
477 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 /* setup the state */
480 state->config = config;
481 state->i2c = i2c;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 state->prevUCBlocks = 0;
483
484 /* check if the demod is there */
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700485 if (cx22702_readreg(state, 0x1f) != 0x3)
486 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 /* create dvb_frontend */
Patrick Boettcherdea74862006-05-14 05:01:31 -0300489 memcpy(&state->frontend.ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 state->frontend.demodulator_priv = state;
491 return &state->frontend;
492
493error:
494 kfree(state);
495 return NULL;
496}
497
498static struct dvb_frontend_ops cx22702_ops = {
499
500 .info = {
501 .name = "Conexant CX22702 DVB-T",
502 .type = FE_OFDM,
503 .frequency_min = 177000000,
504 .frequency_max = 858000000,
505 .frequency_stepsize = 166666,
506 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
507 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
508 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
509 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
510 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
511 },
512
513 .release = cx22702_release,
514
515 .init = cx22702_init,
Andrew de Quincey02444222006-04-18 17:47:09 -0300516 .i2c_gate_ctrl = cx22702_i2c_gate_ctrl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 .set_frontend = cx22702_set_tps,
519 .get_frontend = cx22702_get_frontend,
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700520 .get_tune_settings = cx22702_get_tune_settings,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522 .read_status = cx22702_read_status,
523 .read_ber = cx22702_read_ber,
524 .read_signal_strength = cx22702_read_signal_strength,
525 .read_snr = cx22702_read_snr,
526 .read_ucblocks = cx22702_read_ucblocks,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527};
528
529module_param(debug, int, 0644);
530MODULE_PARM_DESC(debug, "Enable verbose debug messages");
531
532MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
533MODULE_AUTHOR("Steven Toth");
534MODULE_LICENSE("GPL");
535
536EXPORT_SYMBOL(cx22702_attach);