blob: 5de0e6d350b1ae7223bee890f9710efda14f87d3 [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
43 struct dvb_frontend_ops ops;
44
45 /* configuration settings */
46 const struct cx22702_config* config;
47
48 struct dvb_frontend frontend;
49
50 /* previous uncorrected block counter */
51 u8 prevUCBlocks;
52};
53
54static int debug = 0;
55#define dprintk if (debug) printk
56
57/* Register values to initialise the demod */
58static u8 init_tab [] = {
59 0x00, 0x00, /* Stop aquisition */
60 0x0B, 0x06,
61 0x09, 0x01,
62 0x0D, 0x41,
63 0x16, 0x32,
64 0x20, 0x0A,
65 0x21, 0x17,
66 0x24, 0x3e,
67 0x26, 0xff,
68 0x27, 0x10,
69 0x28, 0x00,
70 0x29, 0x00,
71 0x2a, 0x10,
72 0x2b, 0x00,
73 0x2c, 0x10,
74 0x2d, 0x00,
75 0x48, 0xd4,
76 0x49, 0x56,
77 0x6b, 0x1e,
78 0xc8, 0x02,
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 0xf9, 0x00,
80 0xfa, 0x00,
81 0xfb, 0x00,
82 0xfc, 0x00,
83 0xfd, 0x00,
84};
85
86static int cx22702_writereg (struct cx22702_state* state, u8 reg, u8 data)
87{
88 int ret;
89 u8 buf [] = { reg, data };
90 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
91
92 ret = i2c_transfer(state->i2c, &msg, 1);
93
94 if (ret != 1)
95 printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
96 __FUNCTION__, reg, data, ret);
97
98 return (ret != 1) ? -1 : 0;
99}
100
101static u8 cx22702_readreg (struct cx22702_state* state, u8 reg)
102{
103 int ret;
104 u8 b0 [] = { reg };
105 u8 b1 [] = { 0 };
106
107 struct i2c_msg msg [] = {
108 { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
109 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
110
111 ret = i2c_transfer(state->i2c, msg, 2);
112
113 if (ret != 2)
114 printk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
115
116 return b1[0];
117}
118
119static int cx22702_set_inversion (struct cx22702_state *state, int inversion)
120{
121 u8 val;
122
123 switch (inversion) {
124
125 case INVERSION_AUTO:
126 return -EOPNOTSUPP;
127
128 case INVERSION_ON:
129 val = cx22702_readreg (state, 0x0C);
130 return cx22702_writereg (state, 0x0C, val | 0x01);
131
132 case INVERSION_OFF:
133 val = cx22702_readreg (state, 0x0C);
134 return cx22702_writereg (state, 0x0C, val & 0xfe);
135
136 default:
137 return -EINVAL;
138
139 }
140
141}
142
143/* Retrieve the demod settings */
144static int cx22702_get_tps (struct cx22702_state *state, struct dvb_ofdm_parameters *p)
145{
146 u8 val;
147
148 /* Make sure the TPS regs are valid */
149 if (!(cx22702_readreg(state, 0x0A) & 0x20))
150 return -EAGAIN;
151
152 val = cx22702_readreg (state, 0x01);
153 switch( (val&0x18)>>3) {
154 case 0: p->constellation = QPSK; break;
155 case 1: p->constellation = QAM_16; break;
156 case 2: p->constellation = QAM_64; break;
157 }
158 switch( val&0x07 ) {
159 case 0: p->hierarchy_information = HIERARCHY_NONE; break;
160 case 1: p->hierarchy_information = HIERARCHY_1; break;
161 case 2: p->hierarchy_information = HIERARCHY_2; break;
162 case 3: p->hierarchy_information = HIERARCHY_4; break;
163 }
164
165
166 val = cx22702_readreg (state, 0x02);
167 switch( (val&0x38)>>3 ) {
168 case 0: p->code_rate_HP = FEC_1_2; break;
169 case 1: p->code_rate_HP = FEC_2_3; break;
170 case 2: p->code_rate_HP = FEC_3_4; break;
171 case 3: p->code_rate_HP = FEC_5_6; break;
172 case 4: p->code_rate_HP = FEC_7_8; break;
173 }
174 switch( val&0x07 ) {
175 case 0: p->code_rate_LP = FEC_1_2; break;
176 case 1: p->code_rate_LP = FEC_2_3; break;
177 case 2: p->code_rate_LP = FEC_3_4; break;
178 case 3: p->code_rate_LP = FEC_5_6; break;
179 case 4: p->code_rate_LP = FEC_7_8; break;
180 }
181
182
183 val = cx22702_readreg (state, 0x03);
184 switch( (val&0x0c)>>2 ) {
185 case 0: p->guard_interval = GUARD_INTERVAL_1_32; break;
186 case 1: p->guard_interval = GUARD_INTERVAL_1_16; break;
187 case 2: p->guard_interval = GUARD_INTERVAL_1_8; break;
188 case 3: p->guard_interval = GUARD_INTERVAL_1_4; break;
189 }
190 switch( val&0x03 ) {
191 case 0: p->transmission_mode = TRANSMISSION_MODE_2K; break;
192 case 1: p->transmission_mode = TRANSMISSION_MODE_8K; break;
193 }
194
195 return 0;
196}
197
198/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
199static int cx22702_set_tps (struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
200{
201 u8 val;
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700202 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204 /* set PLL */
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700205 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) &0xfe);
Gerd Knorr9990d742005-05-01 08:59:20 -0700206 if (state->config->pll_set) {
207 state->config->pll_set(fe, p);
208 } else if (state->config->pll_desc) {
209 u8 pllbuf[4];
210 struct i2c_msg msg = { .addr = state->config->pll_address,
211 .buf = pllbuf, .len = 4 };
212 dvb_pll_configure(state->config->pll_desc, pllbuf,
213 p->frequency,
214 p->u.ofdm.bandwidth);
215 i2c_transfer(state->i2c, &msg, 1);
216 } else {
217 BUG();
218 }
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700219 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
221 /* set inversion */
222 cx22702_set_inversion (state, p->inversion);
223
224 /* set bandwidth */
225 switch(p->u.ofdm.bandwidth) {
226 case BANDWIDTH_6_MHZ:
227 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x20 );
228 break;
229 case BANDWIDTH_7_MHZ:
230 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xcf) | 0x10 );
231 break;
232 case BANDWIDTH_8_MHZ:
233 cx22702_writereg(state, 0x0C, cx22702_readreg(state, 0x0C) &0xcf );
234 break;
235 default:
236 dprintk ("%s: invalid bandwidth\n",__FUNCTION__);
237 return -EINVAL;
238 }
239
240
241 p->u.ofdm.code_rate_LP = FEC_AUTO; //temp hack as manual not working
242
243 /* use auto configuration? */
244 if((p->u.ofdm.hierarchy_information==HIERARCHY_AUTO) ||
245 (p->u.ofdm.constellation==QAM_AUTO) ||
246 (p->u.ofdm.code_rate_HP==FEC_AUTO) ||
247 (p->u.ofdm.code_rate_LP==FEC_AUTO) ||
248 (p->u.ofdm.guard_interval==GUARD_INTERVAL_AUTO) ||
249 (p->u.ofdm.transmission_mode==TRANSMISSION_MODE_AUTO) ) {
250
251 /* TPS Source - use hardware driven values */
252 cx22702_writereg(state, 0x06, 0x10);
253 cx22702_writereg(state, 0x07, 0x9);
254 cx22702_writereg(state, 0x08, 0xC1);
255 cx22702_writereg(state, 0x0B, cx22702_readreg(state, 0x0B) & 0xfc );
256 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
257 cx22702_writereg(state, 0x00, 0x01); /* Begin aquisition */
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700258 dprintk("%s: Autodetecting\n",__FUNCTION__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 return 0;
260 }
261
262 /* manually programmed values */
263 val=0;
264 switch(p->u.ofdm.constellation) {
265 case QPSK: val = (val&0xe7); break;
266 case QAM_16: val = (val&0xe7)|0x08; break;
267 case QAM_64: val = (val&0xe7)|0x10; break;
268 default:
269 dprintk ("%s: invalid constellation\n",__FUNCTION__);
270 return -EINVAL;
271 }
272 switch(p->u.ofdm.hierarchy_information) {
273 case HIERARCHY_NONE: val = (val&0xf8); break;
274 case HIERARCHY_1: val = (val&0xf8)|1; break;
275 case HIERARCHY_2: val = (val&0xf8)|2; break;
276 case HIERARCHY_4: val = (val&0xf8)|3; break;
277 default:
278 dprintk ("%s: invalid hierarchy\n",__FUNCTION__);
279 return -EINVAL;
280 }
281 cx22702_writereg (state, 0x06, val);
282
283 val=0;
284 switch(p->u.ofdm.code_rate_HP) {
285 case FEC_NONE:
286 case FEC_1_2: val = (val&0xc7); break;
287 case FEC_2_3: val = (val&0xc7)|0x08; break;
288 case FEC_3_4: val = (val&0xc7)|0x10; break;
289 case FEC_5_6: val = (val&0xc7)|0x18; break;
290 case FEC_7_8: val = (val&0xc7)|0x20; break;
291 default:
292 dprintk ("%s: invalid code_rate_HP\n",__FUNCTION__);
293 return -EINVAL;
294 }
295 switch(p->u.ofdm.code_rate_LP) {
296 case FEC_NONE:
297 case FEC_1_2: val = (val&0xf8); break;
298 case FEC_2_3: val = (val&0xf8)|1; break;
299 case FEC_3_4: val = (val&0xf8)|2; break;
300 case FEC_5_6: val = (val&0xf8)|3; break;
301 case FEC_7_8: val = (val&0xf8)|4; break;
302 default:
303 dprintk ("%s: invalid code_rate_LP\n",__FUNCTION__);
304 return -EINVAL;
305 }
306 cx22702_writereg (state, 0x07, val);
307
308 val=0;
309 switch(p->u.ofdm.guard_interval) {
310 case GUARD_INTERVAL_1_32: val = (val&0xf3); break;
311 case GUARD_INTERVAL_1_16: val = (val&0xf3)|0x04; break;
312 case GUARD_INTERVAL_1_8: val = (val&0xf3)|0x08; break;
313 case GUARD_INTERVAL_1_4: val = (val&0xf3)|0x0c; break;
314 default:
315 dprintk ("%s: invalid guard_interval\n",__FUNCTION__);
316 return -EINVAL;
317 }
318 switch(p->u.ofdm.transmission_mode) {
319 case TRANSMISSION_MODE_2K: val = (val&0xfc); break;
320 case TRANSMISSION_MODE_8K: val = (val&0xfc)|1; break;
321 default:
322 dprintk ("%s: invalid transmission_mode\n",__FUNCTION__);
323 return -EINVAL;
324 }
325 cx22702_writereg(state, 0x08, val);
326 cx22702_writereg(state, 0x0B, (cx22702_readreg(state, 0x0B) & 0xfc) | 0x02 );
327 cx22702_writereg(state, 0x0C, (cx22702_readreg(state, 0x0C) & 0xBF) | 0x40 );
328
329 /* Begin channel aquisition */
330 cx22702_writereg(state, 0x00, 0x01);
331
332 return 0;
333}
334
335/* Reset the demod hardware and reset all of the configuration registers
336 to a default state. */
337static int cx22702_init (struct dvb_frontend* fe)
338{
339 int i;
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700340 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
342 cx22702_writereg (state, 0x00, 0x02);
343
344 msleep(10);
345
346 for (i=0; i<sizeof(init_tab); i+=2)
347 cx22702_writereg (state, init_tab[i], init_tab[i+1]);
348
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700349 cx22702_writereg (state, 0xf8, (state->config->output_mode << 1) & 0x02);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351 /* init PLL */
352 if (state->config->pll_init) {
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700353 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) & 0xfe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 state->config->pll_init(fe);
355 cx22702_writereg (state, 0x0D, cx22702_readreg(state,0x0D) | 1);
356 }
357
358 return 0;
359}
360
361static int cx22702_read_status(struct dvb_frontend* fe, fe_status_t* status)
362{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700363 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 u8 reg0A;
365 u8 reg23;
366
367 *status = 0;
368
369 reg0A = cx22702_readreg (state, 0x0A);
370 reg23 = cx22702_readreg (state, 0x23);
371
372 dprintk ("%s: status demod=0x%02x agc=0x%02x\n"
373 ,__FUNCTION__,reg0A,reg23);
374
375 if(reg0A & 0x10) {
376 *status |= FE_HAS_LOCK;
377 *status |= FE_HAS_VITERBI;
378 *status |= FE_HAS_SYNC;
379 }
380
381 if(reg0A & 0x20)
382 *status |= FE_HAS_CARRIER;
383
384 if(reg23 < 0xf0)
385 *status |= FE_HAS_SIGNAL;
386
387 return 0;
388}
389
390static int cx22702_read_ber(struct dvb_frontend* fe, u32* ber)
391{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700392 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
394 if(cx22702_readreg (state, 0xE4) & 0x02) {
395 /* Realtime statistics */
396 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
397 | (cx22702_readreg (state, 0xDF)&0x7F);
398 } else {
399 /* Averagtine statistics */
400 *ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 7
401 | cx22702_readreg (state, 0xDF);
402 }
403
404 return 0;
405}
406
407static int cx22702_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
408{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700409 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
411 *signal_strength = cx22702_readreg (state, 0x23);
412
413 return 0;
414}
415
416static int cx22702_read_snr(struct dvb_frontend* fe, u16* snr)
417{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700418 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 u16 rs_ber=0;
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);
425 } else {
426 /* Averagine statistics */
427 rs_ber = (cx22702_readreg (state, 0xDE) & 0x7F) << 8
428 | cx22702_readreg (state, 0xDF);
429 }
430 *snr = ~rs_ber;
431
432 return 0;
433}
434
435static int cx22702_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
436{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700437 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
439 u8 _ucblocks;
440
441 /* RS Uncorrectable Packet Count then reset */
442 _ucblocks = cx22702_readreg (state, 0xE3);
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700443 if (state->prevUCBlocks < _ucblocks)
444 *ucblocks = (_ucblocks - state->prevUCBlocks);
445 else
446 *ucblocks = state->prevUCBlocks - _ucblocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 state->prevUCBlocks = _ucblocks;
448
449 return 0;
450}
451
452static int cx22702_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
453{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700454 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
456 u8 reg0C = cx22702_readreg (state, 0x0C);
457
458 p->inversion = reg0C & 0x1 ? INVERSION_ON : INVERSION_OFF;
459 return cx22702_get_tps (state, &p->u.ofdm);
460}
461
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700462static int cx22702_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
463{
464 tune->min_delay_ms = 1000;
465 return 0;
466}
467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468static void cx22702_release(struct dvb_frontend* fe)
469{
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700470 struct cx22702_state* state = fe->demodulator_priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 kfree(state);
472}
473
474static struct dvb_frontend_ops cx22702_ops;
475
476struct dvb_frontend* cx22702_attach(const struct cx22702_config* config,
477 struct i2c_adapter* i2c)
478{
479 struct cx22702_state* state = NULL;
480
481 /* allocate memory for the internal state */
Johannes Stezenbachb8742702005-05-16 21:54:31 -0700482 state = kmalloc(sizeof(struct cx22702_state), GFP_KERNEL);
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700483 if (state == NULL)
484 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
486 /* setup the state */
487 state->config = config;
488 state->i2c = i2c;
489 memcpy(&state->ops, &cx22702_ops, sizeof(struct dvb_frontend_ops));
490 state->prevUCBlocks = 0;
491
492 /* check if the demod is there */
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700493 if (cx22702_readreg(state, 0x1f) != 0x3)
494 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 /* create dvb_frontend */
497 state->frontend.ops = &state->ops;
498 state->frontend.demodulator_priv = state;
499 return &state->frontend;
500
501error:
502 kfree(state);
503 return NULL;
504}
505
506static struct dvb_frontend_ops cx22702_ops = {
507
508 .info = {
509 .name = "Conexant CX22702 DVB-T",
510 .type = FE_OFDM,
511 .frequency_min = 177000000,
512 .frequency_max = 858000000,
513 .frequency_stepsize = 166666,
514 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
515 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
516 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
517 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
518 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
519 },
520
521 .release = cx22702_release,
522
523 .init = cx22702_init,
524
525 .set_frontend = cx22702_set_tps,
526 .get_frontend = cx22702_get_frontend,
Patrick Boettcherf46dbb02005-07-07 17:57:44 -0700527 .get_tune_settings = cx22702_get_tune_settings,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 .read_status = cx22702_read_status,
530 .read_ber = cx22702_read_ber,
531 .read_signal_strength = cx22702_read_signal_strength,
532 .read_snr = cx22702_read_snr,
533 .read_ucblocks = cx22702_read_ucblocks,
534};
535
536module_param(debug, int, 0644);
537MODULE_PARM_DESC(debug, "Enable verbose debug messages");
538
539MODULE_DESCRIPTION("Conexant CX22702 DVB-T Demodulator driver");
540MODULE_AUTHOR("Steven Toth");
541MODULE_LICENSE("GPL");
542
543EXPORT_SYMBOL(cx22702_attach);