1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
|
/*
* at76c651.c
*
* Atmel DVB-C Frontend Driver (at76c651/dat7021)
*
* Copyright (C) 2001 fnbrd <fnbrd@gmx.de>
* & 2002 Andreas Oberritter <andreas@oberritter.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <asm/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#if defined(__powerpc__)
#include <asm/bitops.h>
#endif
#include "dvb_frontend.h"
#include "dvb_i2c.h"
#include "compat.h"
static int debug = 0;
#define dprintk if (debug) printk
/*
* DAT7021
* -------
* Input Frequency Range (RF): 48.25 MHz to 863.25 MHz
* Band Width: 8 MHz
* Level Input (Range for Digital Signals): -61 dBm to -41 dBm
* Output Frequency (IF): 36 MHz
*
* (see http://www.atmel.com/atmel/acrobat/doc1320.pdf)
*/
static struct dvb_frontend_info at76c651_info = {
.name = "Atmel AT76c651(B) with DAT7021",
.type = FE_QAM,
.frequency_min = 48250000,
.frequency_max = 863250000,
.frequency_stepsize = 62500,
/*.frequency_tolerance = */ /* FIXME: 12% of SR */
.symbol_rate_min = 0, /* FIXME */
.symbol_rate_max = 9360000, /* FIXME */
.symbol_rate_tolerance = 4000,
.notifier_delay = 0,
.caps = FE_CAN_INVERSION_AUTO |
FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 | FE_CAN_QAM_128 |
FE_CAN_QAM_256 /* | FE_CAN_QAM_512 | FE_CAN_QAM_1024 */ |
FE_CAN_RECOVER | FE_CAN_CLEAN_SETUP | FE_CAN_MUTE_TS
};
#if ! defined(__powerpc__)
static __inline__ int
__ilog2(unsigned long x)
{
int i;
if (x == 0)
return -1;
for (i = 0; x != 0; i++)
x >>= 1;
return i - 1;
}
#endif
static int
at76c651_writereg(struct dvb_i2c_bus *i2c, u8 reg, u8 data)
{
int ret;
u8 buf[] = { reg, data };
struct i2c_msg msg = { addr:0x1a >> 1, flags:0, buf:buf, len:2 };
ret = i2c->xfer(i2c, &msg, 1);
if (ret != 1)
dprintk("%s: writereg error "
"(reg == 0x%02x, val == 0x%02x, ret == %i)\n",
__FUNCTION__, reg, data, ret);
ddelay(10);
return (ret != 1) ? -EREMOTEIO : 0;
}
static u8
at76c651_readreg(struct dvb_i2c_bus *i2c, u8 reg)
{
int ret;
u8 b0[] = { reg };
u8 b1[] = { 0 };
struct i2c_msg msg[] = { {addr: 0x1a >> 1, flags: 0, buf: b0, len:1},
{addr: 0x1a >> 1, flags: I2C_M_RD, buf: b1, len:1} };
ret = i2c->xfer(i2c, msg, 2);
if (ret != 2)
dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
return b1[0];
}
static int
at76c651_set_auto_config(struct dvb_i2c_bus *i2c)
{
at76c651_writereg(i2c, 0x06, 0x01);
/*
* performance optimizations
*/
at76c651_writereg(i2c, 0x10, 0x06);
at76c651_writereg(i2c, 0x11, 0x10);
at76c651_writereg(i2c, 0x15, 0x28);
at76c651_writereg(i2c, 0x20, 0x09);
at76c651_writereg(i2c, 0x24, 0x90);
return 0;
}
static int
at76c651_set_bbfreq(struct dvb_i2c_bus *i2c)
{
at76c651_writereg(i2c, 0x04, 0x3f);
at76c651_writereg(i2c, 0x05, 0xee);
return 0;
}
static int
at76c651_reset(struct dvb_i2c_bus *i2c)
{
return at76c651_writereg(i2c, 0x07, 0x01);
}
static int
at76c651_disable_interrupts(struct dvb_i2c_bus *i2c)
{
return at76c651_writereg(i2c, 0x0b, 0x00);
}
static int
at76c651_switch_tuner_i2c(struct dvb_i2c_bus *i2c, u8 enable)
{
if (enable)
return at76c651_writereg(i2c, 0x0c, 0xc2 | 0x01);
else
return at76c651_writereg(i2c, 0x0c, 0xc2);
}
static int
dat7021_write(struct dvb_i2c_bus *i2c, u32 tw)
{
int ret;
struct i2c_msg msg =
{ addr:0xc2 >> 1, flags:0, buf:(u8 *) & tw, len:sizeof (tw) };
at76c651_switch_tuner_i2c(i2c, 1);
ret = i2c->xfer(i2c, &msg, 1);
at76c651_switch_tuner_i2c(i2c, 0);
if (ret != 4)
return -EFAULT;
at76c651_reset(i2c);
return 0;
}
static int
dat7021_set_tv_freq(struct dvb_i2c_bus *i2c, u32 freq)
{
u32 dw;
freq /= 1000;
if ((freq < 48250) || (freq > 863250))
return -EINVAL;
/*
* formula: dw=0x17e28e06+(freq-346000UL)/8000UL*0x800000
* or: dw=0x4E28E06+(freq-42000) / 125 * 0x20000
*/
dw = (freq - 42000) * 4096;
dw = dw / 125;
dw = dw * 32;
if (freq > 394000)
dw += 0x4E28E85;
else
dw += 0x4E28E06;
return dat7021_write(i2c, dw);
}
static int
at76c651_set_symbolrate(struct dvb_i2c_bus *i2c, u32 symbolrate)
{
u8 exponent;
u32 mantissa;
if (symbolrate > 9360000)
return -1;
/*
* FREF = 57800 kHz
* exponent = 10 + floor ( log2 ( symbolrate / FREF ) )
* mantissa = ( symbolrate / FREF) * ( 1 << ( 30 - exponent ) )
*/
exponent = __ilog2((symbolrate << 4) / 903125);
mantissa = ((symbolrate / 3125) * (1 << (24 - exponent))) / 289;
at76c651_writereg(i2c, 0x00, mantissa >> 13);
at76c651_writereg(i2c, 0x01, mantissa >> 5);
at76c651_writereg(i2c, 0x02, (mantissa << 3) | exponent);
return 0;
}
static int
at76c651_set_qam(struct dvb_i2c_bus *i2c, fe_modulation_t qam)
{
u8 qamsel = 0;
switch (qam) {
case QPSK:
qamsel = 0x02;
break;
case QAM_16:
qamsel = 0x04;
break;
case QAM_32:
qamsel = 0x05;
break;
case QAM_64:
qamsel = 0x06;
break;
case QAM_128:
qamsel = 0x07;
break;
case QAM_256:
qamsel = 0x08;
break;
#if 0
case QAM_512:
qamsel = 0x09;
break;
case QAM_1024:
qamsel = 0x0A;
break;
#endif
default:
return -EINVAL;
}
return at76c651_writereg(i2c, 0x03, qamsel);
}
static int
at76c651_set_inversion(struct dvb_i2c_bus *i2c,
fe_spectral_inversion_t inversion)
{
u8 feciqinv = at76c651_readreg(i2c, 0x60);
switch (inversion) {
case INVERSION_OFF:
feciqinv |= 0x02;
feciqinv &= 0xFE;
break;
case INVERSION_ON:
feciqinv |= 0x03;
break;
case INVERSION_AUTO:
feciqinv &= 0xFC;
break;
default:
return -EINVAL;
}
return at76c651_writereg(i2c, 0x60, feciqinv);
}
static int
at76c651_set_parameters(struct dvb_i2c_bus *i2c,
struct dvb_frontend_parameters *p)
{
dat7021_set_tv_freq(i2c, p->frequency);
at76c651_set_symbolrate(i2c, p->u.qam.symbol_rate);
at76c651_set_inversion(i2c, p->inversion);
at76c651_set_auto_config(i2c);
return 0;
}
static int
at76c651_set_defaults(struct dvb_i2c_bus *i2c)
{
at76c651_set_symbolrate(i2c, 6900000);
at76c651_set_qam(i2c, QAM_64);
at76c651_set_bbfreq(i2c);
at76c651_set_auto_config(i2c);
at76c651_disable_interrupts(i2c);
return 0;
}
static int
at76c651_ioctl(struct dvb_frontend *fe, unsigned int cmd, void *arg)
{
switch (cmd) {
case FE_GET_INFO:
memcpy(arg, &at76c651_info, sizeof (struct dvb_frontend_info));
break;
case FE_READ_STATUS:
{
fe_status_t *status = (fe_status_t *) arg;
u8 sync;
/*
* Bits: FEC, CAR, EQU, TIM, AGC2, AGC1, ADC, PLL (PLL=0)
*/
sync = at76c651_readreg(fe->i2c, 0x80);
*status = 0;
if (sync & (0x04 | 0x10)) /* AGC1 || TIM */
*status |= FE_HAS_SIGNAL;
if (sync & 0x10) /* TIM */
*status |= FE_HAS_CARRIER;
if (sync & 0x80) /* FEC */
*status |= FE_HAS_VITERBI;
if (sync & 0x40) /* CAR */
*status |= FE_HAS_SYNC;
if ((sync & 0xF0) == 0xF0) /* TIM && EQU && CAR && FEC */
*status |= FE_HAS_LOCK;
break;
}
case FE_READ_BER:
{
u32 *ber = (u32 *) arg;
*ber = (at76c651_readreg(fe->i2c, 0x81) & 0x0F) << 16;
*ber |= at76c651_readreg(fe->i2c, 0x82) << 8;
*ber |= at76c651_readreg(fe->i2c, 0x83);
*ber *= 10;
break;
}
case FE_READ_SIGNAL_STRENGTH:
{
u8 gain = ~at76c651_readreg(fe->i2c, 0x91);
*(s32 *) arg = (gain << 8) | gain;
*(s32 *) arg = 0x0FFF;
break;
}
case FE_READ_SNR:
*(s32 *) arg =
0xFFFF -
((at76c651_readreg(fe->i2c, 0x8F) << 8) |
at76c651_readreg(fe->i2c, 0x90));
break;
case FE_READ_UNCORRECTED_BLOCKS:
*(u32 *) arg = at76c651_readreg(fe->i2c, 0x82);
break;
case FE_SET_FRONTEND:
return at76c651_set_parameters(fe->i2c, arg);
case FE_GET_FRONTEND:
break;
case FE_SLEEP:
break;
case FE_INIT:
return at76c651_set_defaults(fe->i2c);
case FE_RESET:
return at76c651_reset(fe->i2c);
default:
return -ENOSYS;
}
return 0;
}
static int
at76c651_attach(struct dvb_i2c_bus *i2c)
{
if (at76c651_readreg(i2c, 0x0e) != 0x65) {
dprintk("no AT76C651(B) found\n");
return -ENODEV;
}
if (at76c651_readreg(i2c, 0x0F) != 0x10) {
if (at76c651_readreg(i2c, 0x0F) == 0x11) {
dprintk("AT76C651B found\n");
} else {
dprintk("no AT76C651(B) found\n");
return -ENODEV;
}
} else {
dprintk("AT76C651B found\n");
}
at76c651_set_defaults(i2c);
dvb_register_frontend(at76c651_ioctl, i2c, NULL, &at76c651_info);
return 0;
}
static void
at76c651_detach(struct dvb_i2c_bus *i2c)
{
dvb_unregister_frontend(at76c651_ioctl, i2c);
at76c651_disable_interrupts(i2c);
}
static int __init
at76c651_init(void)
{
return dvb_register_i2c_device(THIS_MODULE, at76c651_attach,
at76c651_detach);
}
static void __exit
at76c651_exit(void)
{
dvb_unregister_i2c_device(at76c651_attach);
}
module_init(at76c651_init);
module_exit(at76c651_exit);
#ifdef MODULE
MODULE_DESCRIPTION("at76c651/dat7021 dvb-c frontend driver");
MODULE_AUTHOR("Andreas Oberritter <andreas@oberritter.de>");
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
MODULE_PARM(debug, "i");
#endif
|
