1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 Auvitek AU8522 QAM/8VSB demodulator driver
4
5 Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
6
7
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/string.h>
14 #include <linux/delay.h>
15 #include <media/dvb_frontend.h>
16 #include "au8522.h"
17 #include "au8522_priv.h"
18
19 static int debug;
20 static int zv_mode = 1; /* default to on */
21
22 #define dprintk(arg...)\
23 do { if (debug)\
24 printk(arg);\
25 } while (0)
26
27 struct mse2snr_tab {
28 u16 val;
29 u16 data;
30 };
31
32 /* VSB SNR lookup table */
33 static struct mse2snr_tab vsb_mse2snr_tab[] = {
34 { 0, 270 },
35 { 2, 250 },
36 { 3, 240 },
37 { 5, 230 },
38 { 7, 220 },
39 { 9, 210 },
40 { 12, 200 },
41 { 13, 195 },
42 { 15, 190 },
43 { 17, 185 },
44 { 19, 180 },
45 { 21, 175 },
46 { 24, 170 },
47 { 27, 165 },
48 { 31, 160 },
49 { 32, 158 },
50 { 33, 156 },
51 { 36, 152 },
52 { 37, 150 },
53 { 39, 148 },
54 { 40, 146 },
55 { 41, 144 },
56 { 43, 142 },
57 { 44, 140 },
58 { 48, 135 },
59 { 50, 130 },
60 { 43, 142 },
61 { 53, 125 },
62 { 56, 120 },
63 { 256, 115 },
64 };
65
66 /* QAM64 SNR lookup table */
67 static struct mse2snr_tab qam64_mse2snr_tab[] = {
68 { 15, 0 },
69 { 16, 290 },
70 { 17, 288 },
71 { 18, 286 },
72 { 19, 284 },
73 { 20, 282 },
74 { 21, 281 },
75 { 22, 279 },
76 { 23, 277 },
77 { 24, 275 },
78 { 25, 273 },
79 { 26, 271 },
80 { 27, 269 },
81 { 28, 268 },
82 { 29, 266 },
83 { 30, 264 },
84 { 31, 262 },
85 { 32, 260 },
86 { 33, 259 },
87 { 34, 258 },
88 { 35, 256 },
89 { 36, 255 },
90 { 37, 254 },
91 { 38, 252 },
92 { 39, 251 },
93 { 40, 250 },
94 { 41, 249 },
95 { 42, 248 },
96 { 43, 246 },
97 { 44, 245 },
98 { 45, 244 },
99 { 46, 242 },
100 { 47, 241 },
101 { 48, 240 },
102 { 50, 239 },
103 { 51, 238 },
104 { 53, 237 },
105 { 54, 236 },
106 { 56, 235 },
107 { 57, 234 },
108 { 59, 233 },
109 { 60, 232 },
110 { 62, 231 },
111 { 63, 230 },
112 { 65, 229 },
113 { 67, 228 },
114 { 68, 227 },
115 { 70, 226 },
116 { 71, 225 },
117 { 73, 224 },
118 { 74, 223 },
119 { 76, 222 },
120 { 78, 221 },
121 { 80, 220 },
122 { 82, 219 },
123 { 85, 218 },
124 { 88, 217 },
125 { 90, 216 },
126 { 92, 215 },
127 { 93, 214 },
128 { 94, 212 },
129 { 95, 211 },
130 { 97, 210 },
131 { 99, 209 },
132 { 101, 208 },
133 { 102, 207 },
134 { 104, 206 },
135 { 107, 205 },
136 { 111, 204 },
137 { 114, 203 },
138 { 118, 202 },
139 { 122, 201 },
140 { 125, 200 },
141 { 128, 199 },
142 { 130, 198 },
143 { 132, 197 },
144 { 256, 190 },
145 };
146
147 /* QAM256 SNR lookup table */
148 static struct mse2snr_tab qam256_mse2snr_tab[] = {
149 { 15, 0 },
150 { 16, 400 },
151 { 17, 398 },
152 { 18, 396 },
153 { 19, 394 },
154 { 20, 392 },
155 { 21, 390 },
156 { 22, 388 },
157 { 23, 386 },
158 { 24, 384 },
159 { 25, 382 },
160 { 26, 380 },
161 { 27, 379 },
162 { 28, 378 },
163 { 29, 377 },
164 { 30, 376 },
165 { 31, 375 },
166 { 32, 374 },
167 { 33, 373 },
168 { 34, 372 },
169 { 35, 371 },
170 { 36, 370 },
171 { 37, 362 },
172 { 38, 354 },
173 { 39, 346 },
174 { 40, 338 },
175 { 41, 330 },
176 { 42, 328 },
177 { 43, 326 },
178 { 44, 324 },
179 { 45, 322 },
180 { 46, 320 },
181 { 47, 319 },
182 { 48, 318 },
183 { 49, 317 },
184 { 50, 316 },
185 { 51, 315 },
186 { 52, 314 },
187 { 53, 313 },
188 { 54, 312 },
189 { 55, 311 },
190 { 56, 310 },
191 { 57, 308 },
192 { 58, 306 },
193 { 59, 304 },
194 { 60, 302 },
195 { 61, 300 },
196 { 62, 298 },
197 { 65, 295 },
198 { 68, 294 },
199 { 70, 293 },
200 { 73, 292 },
201 { 76, 291 },
202 { 78, 290 },
203 { 79, 289 },
204 { 81, 288 },
205 { 82, 287 },
206 { 83, 286 },
207 { 84, 285 },
208 { 85, 284 },
209 { 86, 283 },
210 { 88, 282 },
211 { 89, 281 },
212 { 256, 280 },
213 };
214
au8522_mse2snr_lookup(struct mse2snr_tab * tab,int sz,int mse,u16 * snr)215 static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
216 u16 *snr)
217 {
218 int i, ret = -EINVAL;
219 dprintk("%s()\n", __func__);
220
221 for (i = 0; i < sz; i++) {
222 if (mse < tab[i].val) {
223 *snr = tab[i].data;
224 ret = 0;
225 break;
226 }
227 }
228 dprintk("%s() snr=%d\n", __func__, *snr);
229 return ret;
230 }
231
au8522_set_if(struct dvb_frontend * fe,enum au8522_if_freq if_freq)232 static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
233 {
234 struct au8522_state *state = fe->demodulator_priv;
235 u8 r0b5, r0b6, r0b7;
236 char *ifmhz;
237
238 switch (if_freq) {
239 case AU8522_IF_3_25MHZ:
240 ifmhz = "3.25";
241 r0b5 = 0x00;
242 r0b6 = 0x3d;
243 r0b7 = 0xa0;
244 break;
245 case AU8522_IF_4MHZ:
246 ifmhz = "4.00";
247 r0b5 = 0x00;
248 r0b6 = 0x4b;
249 r0b7 = 0xd9;
250 break;
251 case AU8522_IF_6MHZ:
252 ifmhz = "6.00";
253 r0b5 = 0xfb;
254 r0b6 = 0x8e;
255 r0b7 = 0x39;
256 break;
257 default:
258 dprintk("%s() IF Frequency not supported\n", __func__);
259 return -EINVAL;
260 }
261 dprintk("%s() %s MHz\n", __func__, ifmhz);
262 au8522_writereg(state, 0x00b5, r0b5);
263 au8522_writereg(state, 0x00b6, r0b6);
264 au8522_writereg(state, 0x00b7, r0b7);
265
266 return 0;
267 }
268
269 /* VSB Modulation table */
270 static struct {
271 u16 reg;
272 u16 data;
273 } VSB_mod_tab[] = {
274 { 0x0090, 0x84 },
275 { 0x2005, 0x00 },
276 { 0x0091, 0x80 },
277 { 0x00a3, 0x0c },
278 { 0x00a4, 0xe8 },
279 { 0x0081, 0xc4 },
280 { 0x00a5, 0x40 },
281 { 0x00a7, 0x40 },
282 { 0x00a6, 0x67 },
283 { 0x0262, 0x20 },
284 { 0x021c, 0x30 },
285 { 0x00d8, 0x1a },
286 { 0x0227, 0xa0 },
287 { 0x0121, 0xff },
288 { 0x00a8, 0xf0 },
289 { 0x00a9, 0x05 },
290 { 0x00aa, 0x77 },
291 { 0x00ab, 0xf0 },
292 { 0x00ac, 0x05 },
293 { 0x00ad, 0x77 },
294 { 0x00ae, 0x41 },
295 { 0x00af, 0x66 },
296 { 0x021b, 0xcc },
297 { 0x021d, 0x80 },
298 { 0x00a4, 0xe8 },
299 { 0x0231, 0x13 },
300 };
301
302 /* QAM64 Modulation table */
303 static struct {
304 u16 reg;
305 u16 data;
306 } QAM64_mod_tab[] = {
307 { 0x00a3, 0x09 },
308 { 0x00a4, 0x00 },
309 { 0x0081, 0xc4 },
310 { 0x00a5, 0x40 },
311 { 0x00aa, 0x77 },
312 { 0x00ad, 0x77 },
313 { 0x00a6, 0x67 },
314 { 0x0262, 0x20 },
315 { 0x021c, 0x30 },
316 { 0x00b8, 0x3e },
317 { 0x00b9, 0xf0 },
318 { 0x00ba, 0x01 },
319 { 0x00bb, 0x18 },
320 { 0x00bc, 0x50 },
321 { 0x00bd, 0x00 },
322 { 0x00be, 0xea },
323 { 0x00bf, 0xef },
324 { 0x00c0, 0xfc },
325 { 0x00c1, 0xbd },
326 { 0x00c2, 0x1f },
327 { 0x00c3, 0xfc },
328 { 0x00c4, 0xdd },
329 { 0x00c5, 0xaf },
330 { 0x00c6, 0x00 },
331 { 0x00c7, 0x38 },
332 { 0x00c8, 0x30 },
333 { 0x00c9, 0x05 },
334 { 0x00ca, 0x4a },
335 { 0x00cb, 0xd0 },
336 { 0x00cc, 0x01 },
337 { 0x00cd, 0xd9 },
338 { 0x00ce, 0x6f },
339 { 0x00cf, 0xf9 },
340 { 0x00d0, 0x70 },
341 { 0x00d1, 0xdf },
342 { 0x00d2, 0xf7 },
343 { 0x00d3, 0xc2 },
344 { 0x00d4, 0xdf },
345 { 0x00d5, 0x02 },
346 { 0x00d6, 0x9a },
347 { 0x00d7, 0xd0 },
348 { 0x0250, 0x0d },
349 { 0x0251, 0xcd },
350 { 0x0252, 0xe0 },
351 { 0x0253, 0x05 },
352 { 0x0254, 0xa7 },
353 { 0x0255, 0xff },
354 { 0x0256, 0xed },
355 { 0x0257, 0x5b },
356 { 0x0258, 0xae },
357 { 0x0259, 0xe6 },
358 { 0x025a, 0x3d },
359 { 0x025b, 0x0f },
360 { 0x025c, 0x0d },
361 { 0x025d, 0xea },
362 { 0x025e, 0xf2 },
363 { 0x025f, 0x51 },
364 { 0x0260, 0xf5 },
365 { 0x0261, 0x06 },
366 { 0x021a, 0x00 },
367 { 0x0546, 0x40 },
368 { 0x0210, 0xc7 },
369 { 0x0211, 0xaa },
370 { 0x0212, 0xab },
371 { 0x0213, 0x02 },
372 { 0x0502, 0x00 },
373 { 0x0121, 0x04 },
374 { 0x0122, 0x04 },
375 { 0x052e, 0x10 },
376 { 0x00a4, 0xca },
377 { 0x00a7, 0x40 },
378 { 0x0526, 0x01 },
379 };
380
381 /* QAM256 Modulation table */
382 static struct {
383 u16 reg;
384 u16 data;
385 } QAM256_mod_tab[] = {
386 { 0x00a3, 0x09 },
387 { 0x00a4, 0x00 },
388 { 0x0081, 0xc4 },
389 { 0x00a5, 0x40 },
390 { 0x00aa, 0x77 },
391 { 0x00ad, 0x77 },
392 { 0x00a6, 0x67 },
393 { 0x0262, 0x20 },
394 { 0x021c, 0x30 },
395 { 0x00b8, 0x3e },
396 { 0x00b9, 0xf0 },
397 { 0x00ba, 0x01 },
398 { 0x00bb, 0x18 },
399 { 0x00bc, 0x50 },
400 { 0x00bd, 0x00 },
401 { 0x00be, 0xea },
402 { 0x00bf, 0xef },
403 { 0x00c0, 0xfc },
404 { 0x00c1, 0xbd },
405 { 0x00c2, 0x1f },
406 { 0x00c3, 0xfc },
407 { 0x00c4, 0xdd },
408 { 0x00c5, 0xaf },
409 { 0x00c6, 0x00 },
410 { 0x00c7, 0x38 },
411 { 0x00c8, 0x30 },
412 { 0x00c9, 0x05 },
413 { 0x00ca, 0x4a },
414 { 0x00cb, 0xd0 },
415 { 0x00cc, 0x01 },
416 { 0x00cd, 0xd9 },
417 { 0x00ce, 0x6f },
418 { 0x00cf, 0xf9 },
419 { 0x00d0, 0x70 },
420 { 0x00d1, 0xdf },
421 { 0x00d2, 0xf7 },
422 { 0x00d3, 0xc2 },
423 { 0x00d4, 0xdf },
424 { 0x00d5, 0x02 },
425 { 0x00d6, 0x9a },
426 { 0x00d7, 0xd0 },
427 { 0x0250, 0x0d },
428 { 0x0251, 0xcd },
429 { 0x0252, 0xe0 },
430 { 0x0253, 0x05 },
431 { 0x0254, 0xa7 },
432 { 0x0255, 0xff },
433 { 0x0256, 0xed },
434 { 0x0257, 0x5b },
435 { 0x0258, 0xae },
436 { 0x0259, 0xe6 },
437 { 0x025a, 0x3d },
438 { 0x025b, 0x0f },
439 { 0x025c, 0x0d },
440 { 0x025d, 0xea },
441 { 0x025e, 0xf2 },
442 { 0x025f, 0x51 },
443 { 0x0260, 0xf5 },
444 { 0x0261, 0x06 },
445 { 0x021a, 0x00 },
446 { 0x0546, 0x40 },
447 { 0x0210, 0x26 },
448 { 0x0211, 0xf6 },
449 { 0x0212, 0x84 },
450 { 0x0213, 0x02 },
451 { 0x0502, 0x01 },
452 { 0x0121, 0x04 },
453 { 0x0122, 0x04 },
454 { 0x052e, 0x10 },
455 { 0x00a4, 0xca },
456 { 0x00a7, 0x40 },
457 { 0x0526, 0x01 },
458 };
459
460 static struct {
461 u16 reg;
462 u16 data;
463 } QAM256_mod_tab_zv_mode[] = {
464 { 0x80a3, 0x09 },
465 { 0x80a4, 0x00 },
466 { 0x8081, 0xc4 },
467 { 0x80a5, 0x40 },
468 { 0x80b5, 0xfb },
469 { 0x80b6, 0x8e },
470 { 0x80b7, 0x39 },
471 { 0x80aa, 0x77 },
472 { 0x80ad, 0x77 },
473 { 0x80a6, 0x67 },
474 { 0x8262, 0x20 },
475 { 0x821c, 0x30 },
476 { 0x80b8, 0x3e },
477 { 0x80b9, 0xf0 },
478 { 0x80ba, 0x01 },
479 { 0x80bb, 0x18 },
480 { 0x80bc, 0x50 },
481 { 0x80bd, 0x00 },
482 { 0x80be, 0xea },
483 { 0x80bf, 0xef },
484 { 0x80c0, 0xfc },
485 { 0x80c1, 0xbd },
486 { 0x80c2, 0x1f },
487 { 0x80c3, 0xfc },
488 { 0x80c4, 0xdd },
489 { 0x80c5, 0xaf },
490 { 0x80c6, 0x00 },
491 { 0x80c7, 0x38 },
492 { 0x80c8, 0x30 },
493 { 0x80c9, 0x05 },
494 { 0x80ca, 0x4a },
495 { 0x80cb, 0xd0 },
496 { 0x80cc, 0x01 },
497 { 0x80cd, 0xd9 },
498 { 0x80ce, 0x6f },
499 { 0x80cf, 0xf9 },
500 { 0x80d0, 0x70 },
501 { 0x80d1, 0xdf },
502 { 0x80d2, 0xf7 },
503 { 0x80d3, 0xc2 },
504 { 0x80d4, 0xdf },
505 { 0x80d5, 0x02 },
506 { 0x80d6, 0x9a },
507 { 0x80d7, 0xd0 },
508 { 0x8250, 0x0d },
509 { 0x8251, 0xcd },
510 { 0x8252, 0xe0 },
511 { 0x8253, 0x05 },
512 { 0x8254, 0xa7 },
513 { 0x8255, 0xff },
514 { 0x8256, 0xed },
515 { 0x8257, 0x5b },
516 { 0x8258, 0xae },
517 { 0x8259, 0xe6 },
518 { 0x825a, 0x3d },
519 { 0x825b, 0x0f },
520 { 0x825c, 0x0d },
521 { 0x825d, 0xea },
522 { 0x825e, 0xf2 },
523 { 0x825f, 0x51 },
524 { 0x8260, 0xf5 },
525 { 0x8261, 0x06 },
526 { 0x821a, 0x01 },
527 { 0x8546, 0x40 },
528 { 0x8210, 0x26 },
529 { 0x8211, 0xf6 },
530 { 0x8212, 0x84 },
531 { 0x8213, 0x02 },
532 { 0x8502, 0x01 },
533 { 0x8121, 0x04 },
534 { 0x8122, 0x04 },
535 { 0x852e, 0x10 },
536 { 0x80a4, 0xca },
537 { 0x80a7, 0x40 },
538 { 0x8526, 0x01 },
539 };
540
au8522_enable_modulation(struct dvb_frontend * fe,enum fe_modulation m)541 static int au8522_enable_modulation(struct dvb_frontend *fe,
542 enum fe_modulation m)
543 {
544 struct au8522_state *state = fe->demodulator_priv;
545 int i;
546
547 dprintk("%s(0x%08x)\n", __func__, m);
548
549 switch (m) {
550 case VSB_8:
551 dprintk("%s() VSB_8\n", __func__);
552 for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
553 au8522_writereg(state,
554 VSB_mod_tab[i].reg,
555 VSB_mod_tab[i].data);
556 au8522_set_if(fe, state->config.vsb_if);
557 break;
558 case QAM_64:
559 dprintk("%s() QAM 64\n", __func__);
560 for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
561 au8522_writereg(state,
562 QAM64_mod_tab[i].reg,
563 QAM64_mod_tab[i].data);
564 au8522_set_if(fe, state->config.qam_if);
565 break;
566 case QAM_256:
567 if (zv_mode) {
568 dprintk("%s() QAM 256 (zv_mode)\n", __func__);
569 for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab_zv_mode); i++)
570 au8522_writereg(state,
571 QAM256_mod_tab_zv_mode[i].reg,
572 QAM256_mod_tab_zv_mode[i].data);
573 au8522_set_if(fe, state->config.qam_if);
574 msleep(100);
575 au8522_writereg(state, 0x821a, 0x00);
576 } else {
577 dprintk("%s() QAM 256\n", __func__);
578 for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
579 au8522_writereg(state,
580 QAM256_mod_tab[i].reg,
581 QAM256_mod_tab[i].data);
582 au8522_set_if(fe, state->config.qam_if);
583 }
584 break;
585 default:
586 dprintk("%s() Invalid modulation\n", __func__);
587 return -EINVAL;
588 }
589
590 state->current_modulation = m;
591
592 return 0;
593 }
594
595 /* Talk to the demod, set the FEC, GUARD, QAM settings etc */
au8522_set_frontend(struct dvb_frontend * fe)596 static int au8522_set_frontend(struct dvb_frontend *fe)
597 {
598 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
599 struct au8522_state *state = fe->demodulator_priv;
600 int ret = -EINVAL;
601
602 dprintk("%s(frequency=%d)\n", __func__, c->frequency);
603
604 if ((state->current_frequency == c->frequency) &&
605 (state->current_modulation == c->modulation))
606 return 0;
607
608 if (fe->ops.tuner_ops.set_params) {
609 if (fe->ops.i2c_gate_ctrl)
610 fe->ops.i2c_gate_ctrl(fe, 1);
611 ret = fe->ops.tuner_ops.set_params(fe);
612 if (fe->ops.i2c_gate_ctrl)
613 fe->ops.i2c_gate_ctrl(fe, 0);
614 }
615
616 if (ret < 0)
617 return ret;
618
619 /* Allow the tuner to settle */
620 if (zv_mode) {
621 dprintk("%s() increase tuner settling time for zv_mode\n",
622 __func__);
623 msleep(250);
624 } else
625 msleep(100);
626
627 au8522_enable_modulation(fe, c->modulation);
628
629 state->current_frequency = c->frequency;
630
631 return 0;
632 }
633
au8522_read_status(struct dvb_frontend * fe,enum fe_status * status)634 static int au8522_read_status(struct dvb_frontend *fe, enum fe_status *status)
635 {
636 struct au8522_state *state = fe->demodulator_priv;
637 u8 reg;
638 u32 tuner_status = 0;
639
640 *status = 0;
641
642 if (state->current_modulation == VSB_8) {
643 dprintk("%s() Checking VSB_8\n", __func__);
644 reg = au8522_readreg(state, 0x0088);
645 if ((reg & 0x03) == 0x03)
646 *status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
647 } else {
648 dprintk("%s() Checking QAM\n", __func__);
649 reg = au8522_readreg(state, 0x0541);
650 if (reg & 0x80)
651 *status |= FE_HAS_VITERBI;
652 if (reg & 0x20)
653 *status |= FE_HAS_LOCK | FE_HAS_SYNC;
654 }
655
656 switch (state->config.status_mode) {
657 case AU8522_DEMODLOCKING:
658 dprintk("%s() DEMODLOCKING\n", __func__);
659 if (*status & FE_HAS_VITERBI)
660 *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
661 break;
662 case AU8522_TUNERLOCKING:
663 /* Get the tuner status */
664 dprintk("%s() TUNERLOCKING\n", __func__);
665 if (fe->ops.tuner_ops.get_status) {
666 if (fe->ops.i2c_gate_ctrl)
667 fe->ops.i2c_gate_ctrl(fe, 1);
668
669 fe->ops.tuner_ops.get_status(fe, &tuner_status);
670
671 if (fe->ops.i2c_gate_ctrl)
672 fe->ops.i2c_gate_ctrl(fe, 0);
673 }
674 if (tuner_status)
675 *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
676 break;
677 }
678 state->fe_status = *status;
679
680 if (*status & FE_HAS_LOCK)
681 /* turn on LED, if it isn't on already */
682 au8522_led_ctrl(state, -1);
683 else
684 /* turn off LED */
685 au8522_led_ctrl(state, 0);
686
687 dprintk("%s() status 0x%08x\n", __func__, *status);
688
689 return 0;
690 }
691
au8522_led_status(struct au8522_state * state,const u16 * snr)692 static int au8522_led_status(struct au8522_state *state, const u16 *snr)
693 {
694 struct au8522_led_config *led_config = state->config.led_cfg;
695 int led;
696 u16 strong;
697
698 /* bail out if we can't control an LED */
699 if (!led_config)
700 return 0;
701
702 if (0 == (state->fe_status & FE_HAS_LOCK))
703 return au8522_led_ctrl(state, 0);
704 else if (state->current_modulation == QAM_256)
705 strong = led_config->qam256_strong;
706 else if (state->current_modulation == QAM_64)
707 strong = led_config->qam64_strong;
708 else /* (state->current_modulation == VSB_8) */
709 strong = led_config->vsb8_strong;
710
711 if (*snr >= strong)
712 led = 2;
713 else
714 led = 1;
715
716 if ((state->led_state) &&
717 (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
718 /* snr didn't change enough to bother
719 * changing the color of the led */
720 return 0;
721
722 return au8522_led_ctrl(state, led);
723 }
724
au8522_read_snr(struct dvb_frontend * fe,u16 * snr)725 static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
726 {
727 struct au8522_state *state = fe->demodulator_priv;
728 int ret = -EINVAL;
729
730 dprintk("%s()\n", __func__);
731
732 if (state->current_modulation == QAM_256)
733 ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
734 ARRAY_SIZE(qam256_mse2snr_tab),
735 au8522_readreg(state, 0x0522),
736 snr);
737 else if (state->current_modulation == QAM_64)
738 ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
739 ARRAY_SIZE(qam64_mse2snr_tab),
740 au8522_readreg(state, 0x0522),
741 snr);
742 else /* VSB_8 */
743 ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
744 ARRAY_SIZE(vsb_mse2snr_tab),
745 au8522_readreg(state, 0x0311),
746 snr);
747
748 if (state->config.led_cfg)
749 au8522_led_status(state, snr);
750
751 return ret;
752 }
753
au8522_read_signal_strength(struct dvb_frontend * fe,u16 * signal_strength)754 static int au8522_read_signal_strength(struct dvb_frontend *fe,
755 u16 *signal_strength)
756 {
757 /* borrowed from lgdt330x.c
758 *
759 * Calculate strength from SNR up to 35dB
760 * Even though the SNR can go higher than 35dB,
761 * there is some comfort factor in having a range of
762 * strong signals that can show at 100%
763 */
764 u16 snr;
765 u32 tmp;
766 int ret = au8522_read_snr(fe, &snr);
767
768 *signal_strength = 0;
769
770 if (0 == ret) {
771 /* The following calculation method was chosen
772 * purely for the sake of code re-use from the
773 * other demod drivers that use this method */
774
775 /* Convert from SNR in dB * 10 to 8.24 fixed-point */
776 tmp = (snr * ((1 << 24) / 10));
777
778 /* Convert from 8.24 fixed-point to
779 * scale the range 0 - 35*2^24 into 0 - 65535*/
780 if (tmp >= 8960 * 0x10000)
781 *signal_strength = 0xffff;
782 else
783 *signal_strength = tmp / 8960;
784 }
785
786 return ret;
787 }
788
au8522_read_ucblocks(struct dvb_frontend * fe,u32 * ucblocks)789 static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
790 {
791 struct au8522_state *state = fe->demodulator_priv;
792
793 if (state->current_modulation == VSB_8)
794 *ucblocks = au8522_readreg(state, 0x0087);
795 else
796 *ucblocks = au8522_readreg(state, 0x0543);
797
798 return 0;
799 }
800
au8522_read_ber(struct dvb_frontend * fe,u32 * ber)801 static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
802 {
803 return au8522_read_ucblocks(fe, ber);
804 }
805
au8522_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c)806 static int au8522_get_frontend(struct dvb_frontend *fe,
807 struct dtv_frontend_properties *c)
808 {
809 struct au8522_state *state = fe->demodulator_priv;
810
811 c->frequency = state->current_frequency;
812 c->modulation = state->current_modulation;
813
814 return 0;
815 }
816
au8522_get_tune_settings(struct dvb_frontend * fe,struct dvb_frontend_tune_settings * tune)817 static int au8522_get_tune_settings(struct dvb_frontend *fe,
818 struct dvb_frontend_tune_settings *tune)
819 {
820 tune->min_delay_ms = 1000;
821 return 0;
822 }
823
824 static const struct dvb_frontend_ops au8522_ops;
825
826
au8522_release(struct dvb_frontend * fe)827 static void au8522_release(struct dvb_frontend *fe)
828 {
829 struct au8522_state *state = fe->demodulator_priv;
830 au8522_release_state(state);
831 }
832
au8522_attach(const struct au8522_config * config,struct i2c_adapter * i2c)833 struct dvb_frontend *au8522_attach(const struct au8522_config *config,
834 struct i2c_adapter *i2c)
835 {
836 struct au8522_state *state = NULL;
837 int instance;
838
839 /* allocate memory for the internal state */
840 instance = au8522_get_state(&state, i2c, config->demod_address);
841 switch (instance) {
842 case 0:
843 dprintk("%s state allocation failed\n", __func__);
844 break;
845 case 1:
846 /* new demod instance */
847 dprintk("%s using new instance\n", __func__);
848 break;
849 default:
850 /* existing demod instance */
851 dprintk("%s using existing instance\n", __func__);
852 break;
853 }
854
855 /* setup the state */
856 state->config = *config;
857 state->i2c = i2c;
858 state->operational_mode = AU8522_DIGITAL_MODE;
859
860 /* create dvb_frontend */
861 memcpy(&state->frontend.ops, &au8522_ops,
862 sizeof(struct dvb_frontend_ops));
863 state->frontend.demodulator_priv = state;
864
865 state->frontend.ops.analog_ops.i2c_gate_ctrl = au8522_analog_i2c_gate_ctrl;
866
867 if (au8522_init(&state->frontend) != 0) {
868 printk(KERN_ERR "%s: Failed to initialize correctly\n",
869 __func__);
870 goto error;
871 }
872
873 /* Note: Leaving the I2C gate open here. */
874 au8522_i2c_gate_ctrl(&state->frontend, 1);
875
876 return &state->frontend;
877
878 error:
879 au8522_release_state(state);
880 return NULL;
881 }
882 EXPORT_SYMBOL_GPL(au8522_attach);
883
884 static const struct dvb_frontend_ops au8522_ops = {
885 .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
886 .info = {
887 .name = "Auvitek AU8522 QAM/8VSB Frontend",
888 .frequency_min_hz = 54 * MHz,
889 .frequency_max_hz = 858 * MHz,
890 .frequency_stepsize_hz = 62500,
891 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
892 },
893
894 .init = au8522_init,
895 .sleep = au8522_sleep,
896 .i2c_gate_ctrl = au8522_i2c_gate_ctrl,
897 .set_frontend = au8522_set_frontend,
898 .get_frontend = au8522_get_frontend,
899 .get_tune_settings = au8522_get_tune_settings,
900 .read_status = au8522_read_status,
901 .read_ber = au8522_read_ber,
902 .read_signal_strength = au8522_read_signal_strength,
903 .read_snr = au8522_read_snr,
904 .read_ucblocks = au8522_read_ucblocks,
905 .release = au8522_release,
906 };
907
908 module_param(debug, int, 0644);
909 MODULE_PARM_DESC(debug, "Enable verbose debug messages");
910
911 module_param(zv_mode, int, 0644);
912 MODULE_PARM_DESC(zv_mode, "Turn on/off ZeeVee modulator compatibility mode (default:on).\n"
913 "\t\ton - modified AU8522 QAM256 initialization.\n"
914 "\t\tProvides faster lock when using ZeeVee modulator based sources");
915
916 MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
917 MODULE_AUTHOR("Steven Toth");
918 MODULE_LICENSE("GPL");
919