1/*
2    Auvitek AU8522 QAM/8VSB demodulator driver
3
4    Copyright (C) 2008 Steven Toth <stoth@linuxtv.org>
5
6    This program is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation; either version 2 of the License, or
9    (at your option) any later version.
10
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14    GNU General Public License for more details.
15
16    You should have received a copy of the GNU General Public License
17    along with this program; if not, write to the Free Software
18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19
20*/
21
22#include <linux/kernel.h>
23#include <linux/init.h>
24#include <linux/module.h>
25#include <linux/string.h>
26#include <linux/delay.h>
27#include "dvb_frontend.h"
28#include "au8522.h"
29#include "au8522_priv.h"
30
31static int debug;
32static int zv_mode = 1; /* default to on */
33
34#define dprintk(arg...)\
35	do { if (debug)\
36		printk(arg);\
37	} while (0)
38
39struct mse2snr_tab {
40	u16 val;
41	u16 data;
42};
43
44/* VSB SNR lookup table */
45static struct mse2snr_tab vsb_mse2snr_tab[] = {
46	{   0, 270 },
47	{   2, 250 },
48	{   3, 240 },
49	{   5, 230 },
50	{   7, 220 },
51	{   9, 210 },
52	{  12, 200 },
53	{  13, 195 },
54	{  15, 190 },
55	{  17, 185 },
56	{  19, 180 },
57	{  21, 175 },
58	{  24, 170 },
59	{  27, 165 },
60	{  31, 160 },
61	{  32, 158 },
62	{  33, 156 },
63	{  36, 152 },
64	{  37, 150 },
65	{  39, 148 },
66	{  40, 146 },
67	{  41, 144 },
68	{  43, 142 },
69	{  44, 140 },
70	{  48, 135 },
71	{  50, 130 },
72	{  43, 142 },
73	{  53, 125 },
74	{  56, 120 },
75	{ 256, 115 },
76};
77
78/* QAM64 SNR lookup table */
79static struct mse2snr_tab qam64_mse2snr_tab[] = {
80	{  15,   0 },
81	{  16, 290 },
82	{  17, 288 },
83	{  18, 286 },
84	{  19, 284 },
85	{  20, 282 },
86	{  21, 281 },
87	{  22, 279 },
88	{  23, 277 },
89	{  24, 275 },
90	{  25, 273 },
91	{  26, 271 },
92	{  27, 269 },
93	{  28, 268 },
94	{  29, 266 },
95	{  30, 264 },
96	{  31, 262 },
97	{  32, 260 },
98	{  33, 259 },
99	{  34, 258 },
100	{  35, 256 },
101	{  36, 255 },
102	{  37, 254 },
103	{  38, 252 },
104	{  39, 251 },
105	{  40, 250 },
106	{  41, 249 },
107	{  42, 248 },
108	{  43, 246 },
109	{  44, 245 },
110	{  45, 244 },
111	{  46, 242 },
112	{  47, 241 },
113	{  48, 240 },
114	{  50, 239 },
115	{  51, 238 },
116	{  53, 237 },
117	{  54, 236 },
118	{  56, 235 },
119	{  57, 234 },
120	{  59, 233 },
121	{  60, 232 },
122	{  62, 231 },
123	{  63, 230 },
124	{  65, 229 },
125	{  67, 228 },
126	{  68, 227 },
127	{  70, 226 },
128	{  71, 225 },
129	{  73, 224 },
130	{  74, 223 },
131	{  76, 222 },
132	{  78, 221 },
133	{  80, 220 },
134	{  82, 219 },
135	{  85, 218 },
136	{  88, 217 },
137	{  90, 216 },
138	{  92, 215 },
139	{  93, 214 },
140	{  94, 212 },
141	{  95, 211 },
142	{  97, 210 },
143	{  99, 209 },
144	{ 101, 208 },
145	{ 102, 207 },
146	{ 104, 206 },
147	{ 107, 205 },
148	{ 111, 204 },
149	{ 114, 203 },
150	{ 118, 202 },
151	{ 122, 201 },
152	{ 125, 200 },
153	{ 128, 199 },
154	{ 130, 198 },
155	{ 132, 197 },
156	{ 256, 190 },
157};
158
159/* QAM256 SNR lookup table */
160static struct mse2snr_tab qam256_mse2snr_tab[] = {
161	{  15,   0 },
162	{  16, 400 },
163	{  17, 398 },
164	{  18, 396 },
165	{  19, 394 },
166	{  20, 392 },
167	{  21, 390 },
168	{  22, 388 },
169	{  23, 386 },
170	{  24, 384 },
171	{  25, 382 },
172	{  26, 380 },
173	{  27, 379 },
174	{  28, 378 },
175	{  29, 377 },
176	{  30, 376 },
177	{  31, 375 },
178	{  32, 374 },
179	{  33, 373 },
180	{  34, 372 },
181	{  35, 371 },
182	{  36, 370 },
183	{  37, 362 },
184	{  38, 354 },
185	{  39, 346 },
186	{  40, 338 },
187	{  41, 330 },
188	{  42, 328 },
189	{  43, 326 },
190	{  44, 324 },
191	{  45, 322 },
192	{  46, 320 },
193	{  47, 319 },
194	{  48, 318 },
195	{  49, 317 },
196	{  50, 316 },
197	{  51, 315 },
198	{  52, 314 },
199	{  53, 313 },
200	{  54, 312 },
201	{  55, 311 },
202	{  56, 310 },
203	{  57, 308 },
204	{  58, 306 },
205	{  59, 304 },
206	{  60, 302 },
207	{  61, 300 },
208	{  62, 298 },
209	{  65, 295 },
210	{  68, 294 },
211	{  70, 293 },
212	{  73, 292 },
213	{  76, 291 },
214	{  78, 290 },
215	{  79, 289 },
216	{  81, 288 },
217	{  82, 287 },
218	{  83, 286 },
219	{  84, 285 },
220	{  85, 284 },
221	{  86, 283 },
222	{  88, 282 },
223	{  89, 281 },
224	{ 256, 280 },
225};
226
227static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
228				 u16 *snr)
229{
230	int i, ret = -EINVAL;
231	dprintk("%s()\n", __func__);
232
233	for (i = 0; i < sz; i++) {
234		if (mse < tab[i].val) {
235			*snr = tab[i].data;
236			ret = 0;
237			break;
238		}
239	}
240	dprintk("%s() snr=%d\n", __func__, *snr);
241	return ret;
242}
243
244static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
245{
246	struct au8522_state *state = fe->demodulator_priv;
247	u8 r0b5, r0b6, r0b7;
248	char *ifmhz;
249
250	switch (if_freq) {
251	case AU8522_IF_3_25MHZ:
252		ifmhz = "3.25";
253		r0b5 = 0x00;
254		r0b6 = 0x3d;
255		r0b7 = 0xa0;
256		break;
257	case AU8522_IF_4MHZ:
258		ifmhz = "4.00";
259		r0b5 = 0x00;
260		r0b6 = 0x4b;
261		r0b7 = 0xd9;
262		break;
263	case AU8522_IF_6MHZ:
264		ifmhz = "6.00";
265		r0b5 = 0xfb;
266		r0b6 = 0x8e;
267		r0b7 = 0x39;
268		break;
269	default:
270		dprintk("%s() IF Frequency not supported\n", __func__);
271		return -EINVAL;
272	}
273	dprintk("%s() %s MHz\n", __func__, ifmhz);
274	au8522_writereg(state, 0x80b5, r0b5);
275	au8522_writereg(state, 0x80b6, r0b6);
276	au8522_writereg(state, 0x80b7, r0b7);
277
278	return 0;
279}
280
281/* VSB Modulation table */
282static struct {
283	u16 reg;
284	u16 data;
285} VSB_mod_tab[] = {
286	{ 0x8090, 0x84 },
287	{ 0x4092, 0x11 },
288	{ 0x2005, 0x00 },
289	{ 0x8091, 0x80 },
290	{ 0x80a3, 0x0c },
291	{ 0x80a4, 0xe8 },
292	{ 0x8081, 0xc4 },
293	{ 0x80a5, 0x40 },
294	{ 0x80a7, 0x40 },
295	{ 0x80a6, 0x67 },
296	{ 0x8262, 0x20 },
297	{ 0x821c, 0x30 },
298	{ 0x80d8, 0x1a },
299	{ 0x8227, 0xa0 },
300	{ 0x8121, 0xff },
301	{ 0x80a8, 0xf0 },
302	{ 0x80a9, 0x05 },
303	{ 0x80aa, 0x77 },
304	{ 0x80ab, 0xf0 },
305	{ 0x80ac, 0x05 },
306	{ 0x80ad, 0x77 },
307	{ 0x80ae, 0x41 },
308	{ 0x80af, 0x66 },
309	{ 0x821b, 0xcc },
310	{ 0x821d, 0x80 },
311	{ 0x80a4, 0xe8 },
312	{ 0x8231, 0x13 },
313};
314
315/* QAM64 Modulation table */
316static struct {
317	u16 reg;
318	u16 data;
319} QAM64_mod_tab[] = {
320	{ 0x00a3, 0x09 },
321	{ 0x00a4, 0x00 },
322	{ 0x0081, 0xc4 },
323	{ 0x00a5, 0x40 },
324	{ 0x00aa, 0x77 },
325	{ 0x00ad, 0x77 },
326	{ 0x00a6, 0x67 },
327	{ 0x0262, 0x20 },
328	{ 0x021c, 0x30 },
329	{ 0x00b8, 0x3e },
330	{ 0x00b9, 0xf0 },
331	{ 0x00ba, 0x01 },
332	{ 0x00bb, 0x18 },
333	{ 0x00bc, 0x50 },
334	{ 0x00bd, 0x00 },
335	{ 0x00be, 0xea },
336	{ 0x00bf, 0xef },
337	{ 0x00c0, 0xfc },
338	{ 0x00c1, 0xbd },
339	{ 0x00c2, 0x1f },
340	{ 0x00c3, 0xfc },
341	{ 0x00c4, 0xdd },
342	{ 0x00c5, 0xaf },
343	{ 0x00c6, 0x00 },
344	{ 0x00c7, 0x38 },
345	{ 0x00c8, 0x30 },
346	{ 0x00c9, 0x05 },
347	{ 0x00ca, 0x4a },
348	{ 0x00cb, 0xd0 },
349	{ 0x00cc, 0x01 },
350	{ 0x00cd, 0xd9 },
351	{ 0x00ce, 0x6f },
352	{ 0x00cf, 0xf9 },
353	{ 0x00d0, 0x70 },
354	{ 0x00d1, 0xdf },
355	{ 0x00d2, 0xf7 },
356	{ 0x00d3, 0xc2 },
357	{ 0x00d4, 0xdf },
358	{ 0x00d5, 0x02 },
359	{ 0x00d6, 0x9a },
360	{ 0x00d7, 0xd0 },
361	{ 0x0250, 0x0d },
362	{ 0x0251, 0xcd },
363	{ 0x0252, 0xe0 },
364	{ 0x0253, 0x05 },
365	{ 0x0254, 0xa7 },
366	{ 0x0255, 0xff },
367	{ 0x0256, 0xed },
368	{ 0x0257, 0x5b },
369	{ 0x0258, 0xae },
370	{ 0x0259, 0xe6 },
371	{ 0x025a, 0x3d },
372	{ 0x025b, 0x0f },
373	{ 0x025c, 0x0d },
374	{ 0x025d, 0xea },
375	{ 0x025e, 0xf2 },
376	{ 0x025f, 0x51 },
377	{ 0x0260, 0xf5 },
378	{ 0x0261, 0x06 },
379	{ 0x021a, 0x00 },
380	{ 0x0546, 0x40 },
381	{ 0x0210, 0xc7 },
382	{ 0x0211, 0xaa },
383	{ 0x0212, 0xab },
384	{ 0x0213, 0x02 },
385	{ 0x0502, 0x00 },
386	{ 0x0121, 0x04 },
387	{ 0x0122, 0x04 },
388	{ 0x052e, 0x10 },
389	{ 0x00a4, 0xca },
390	{ 0x00a7, 0x40 },
391	{ 0x0526, 0x01 },
392};
393
394/* QAM256 Modulation table */
395static struct {
396	u16 reg;
397	u16 data;
398} QAM256_mod_tab[] = {
399	{ 0x80a3, 0x09 },
400	{ 0x80a4, 0x00 },
401	{ 0x8081, 0xc4 },
402	{ 0x80a5, 0x40 },
403	{ 0x80aa, 0x77 },
404	{ 0x80ad, 0x77 },
405	{ 0x80a6, 0x67 },
406	{ 0x8262, 0x20 },
407	{ 0x821c, 0x30 },
408	{ 0x80b8, 0x3e },
409	{ 0x80b9, 0xf0 },
410	{ 0x80ba, 0x01 },
411	{ 0x80bb, 0x18 },
412	{ 0x80bc, 0x50 },
413	{ 0x80bd, 0x00 },
414	{ 0x80be, 0xea },
415	{ 0x80bf, 0xef },
416	{ 0x80c0, 0xfc },
417	{ 0x80c1, 0xbd },
418	{ 0x80c2, 0x1f },
419	{ 0x80c3, 0xfc },
420	{ 0x80c4, 0xdd },
421	{ 0x80c5, 0xaf },
422	{ 0x80c6, 0x00 },
423	{ 0x80c7, 0x38 },
424	{ 0x80c8, 0x30 },
425	{ 0x80c9, 0x05 },
426	{ 0x80ca, 0x4a },
427	{ 0x80cb, 0xd0 },
428	{ 0x80cc, 0x01 },
429	{ 0x80cd, 0xd9 },
430	{ 0x80ce, 0x6f },
431	{ 0x80cf, 0xf9 },
432	{ 0x80d0, 0x70 },
433	{ 0x80d1, 0xdf },
434	{ 0x80d2, 0xf7 },
435	{ 0x80d3, 0xc2 },
436	{ 0x80d4, 0xdf },
437	{ 0x80d5, 0x02 },
438	{ 0x80d6, 0x9a },
439	{ 0x80d7, 0xd0 },
440	{ 0x8250, 0x0d },
441	{ 0x8251, 0xcd },
442	{ 0x8252, 0xe0 },
443	{ 0x8253, 0x05 },
444	{ 0x8254, 0xa7 },
445	{ 0x8255, 0xff },
446	{ 0x8256, 0xed },
447	{ 0x8257, 0x5b },
448	{ 0x8258, 0xae },
449	{ 0x8259, 0xe6 },
450	{ 0x825a, 0x3d },
451	{ 0x825b, 0x0f },
452	{ 0x825c, 0x0d },
453	{ 0x825d, 0xea },
454	{ 0x825e, 0xf2 },
455	{ 0x825f, 0x51 },
456	{ 0x8260, 0xf5 },
457	{ 0x8261, 0x06 },
458	{ 0x821a, 0x00 },
459	{ 0x8546, 0x40 },
460	{ 0x8210, 0x26 },
461	{ 0x8211, 0xf6 },
462	{ 0x8212, 0x84 },
463	{ 0x8213, 0x02 },
464	{ 0x8502, 0x01 },
465	{ 0x8121, 0x04 },
466	{ 0x8122, 0x04 },
467	{ 0x852e, 0x10 },
468	{ 0x80a4, 0xca },
469	{ 0x80a7, 0x40 },
470	{ 0x8526, 0x01 },
471};
472
473static struct {
474	u16 reg;
475	u16 data;
476} QAM256_mod_tab_zv_mode[] = {
477	{ 0x80a3, 0x09 },
478	{ 0x80a4, 0x00 },
479	{ 0x8081, 0xc4 },
480	{ 0x80a5, 0x40 },
481	{ 0x80b5, 0xfb },
482	{ 0x80b6, 0x8e },
483	{ 0x80b7, 0x39 },
484	{ 0x80aa, 0x77 },
485	{ 0x80ad, 0x77 },
486	{ 0x80a6, 0x67 },
487	{ 0x8262, 0x20 },
488	{ 0x821c, 0x30 },
489	{ 0x80b8, 0x3e },
490	{ 0x80b9, 0xf0 },
491	{ 0x80ba, 0x01 },
492	{ 0x80bb, 0x18 },
493	{ 0x80bc, 0x50 },
494	{ 0x80bd, 0x00 },
495	{ 0x80be, 0xea },
496	{ 0x80bf, 0xef },
497	{ 0x80c0, 0xfc },
498	{ 0x80c1, 0xbd },
499	{ 0x80c2, 0x1f },
500	{ 0x80c3, 0xfc },
501	{ 0x80c4, 0xdd },
502	{ 0x80c5, 0xaf },
503	{ 0x80c6, 0x00 },
504	{ 0x80c7, 0x38 },
505	{ 0x80c8, 0x30 },
506	{ 0x80c9, 0x05 },
507	{ 0x80ca, 0x4a },
508	{ 0x80cb, 0xd0 },
509	{ 0x80cc, 0x01 },
510	{ 0x80cd, 0xd9 },
511	{ 0x80ce, 0x6f },
512	{ 0x80cf, 0xf9 },
513	{ 0x80d0, 0x70 },
514	{ 0x80d1, 0xdf },
515	{ 0x80d2, 0xf7 },
516	{ 0x80d3, 0xc2 },
517	{ 0x80d4, 0xdf },
518	{ 0x80d5, 0x02 },
519	{ 0x80d6, 0x9a },
520	{ 0x80d7, 0xd0 },
521	{ 0x8250, 0x0d },
522	{ 0x8251, 0xcd },
523	{ 0x8252, 0xe0 },
524	{ 0x8253, 0x05 },
525	{ 0x8254, 0xa7 },
526	{ 0x8255, 0xff },
527	{ 0x8256, 0xed },
528	{ 0x8257, 0x5b },
529	{ 0x8258, 0xae },
530	{ 0x8259, 0xe6 },
531	{ 0x825a, 0x3d },
532	{ 0x825b, 0x0f },
533	{ 0x825c, 0x0d },
534	{ 0x825d, 0xea },
535	{ 0x825e, 0xf2 },
536	{ 0x825f, 0x51 },
537	{ 0x8260, 0xf5 },
538	{ 0x8261, 0x06 },
539	{ 0x821a, 0x01 },
540	{ 0x8546, 0x40 },
541	{ 0x8210, 0x26 },
542	{ 0x8211, 0xf6 },
543	{ 0x8212, 0x84 },
544	{ 0x8213, 0x02 },
545	{ 0x8502, 0x01 },
546	{ 0x8121, 0x04 },
547	{ 0x8122, 0x04 },
548	{ 0x852e, 0x10 },
549	{ 0x80a4, 0xca },
550	{ 0x80a7, 0x40 },
551	{ 0x8526, 0x01 },
552};
553
554static int au8522_enable_modulation(struct dvb_frontend *fe,
555				    fe_modulation_t m)
556{
557	struct au8522_state *state = fe->demodulator_priv;
558	int i;
559
560	dprintk("%s(0x%08x)\n", __func__, m);
561
562	switch (m) {
563	case VSB_8:
564		dprintk("%s() VSB_8\n", __func__);
565		for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
566			au8522_writereg(state,
567				VSB_mod_tab[i].reg,
568				VSB_mod_tab[i].data);
569		au8522_set_if(fe, state->config->vsb_if);
570		break;
571	case QAM_64:
572		dprintk("%s() QAM 64\n", __func__);
573		for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
574			au8522_writereg(state,
575				QAM64_mod_tab[i].reg,
576				QAM64_mod_tab[i].data);
577		au8522_set_if(fe, state->config->qam_if);
578		break;
579	case QAM_256:
580		if (zv_mode) {
581			dprintk("%s() QAM 256 (zv_mode)\n", __func__);
582			for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab_zv_mode); i++)
583				au8522_writereg(state,
584					QAM256_mod_tab_zv_mode[i].reg,
585					QAM256_mod_tab_zv_mode[i].data);
586			au8522_set_if(fe, state->config->qam_if);
587			msleep(100);
588			au8522_writereg(state, 0x821a, 0x00);
589		} else {
590			dprintk("%s() QAM 256\n", __func__);
591			for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
592				au8522_writereg(state,
593					QAM256_mod_tab[i].reg,
594					QAM256_mod_tab[i].data);
595			au8522_set_if(fe, state->config->qam_if);
596		}
597		break;
598	default:
599		dprintk("%s() Invalid modulation\n", __func__);
600		return -EINVAL;
601	}
602
603	state->current_modulation = m;
604
605	return 0;
606}
607
608/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
609static int au8522_set_frontend(struct dvb_frontend *fe)
610{
611	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
612	struct au8522_state *state = fe->demodulator_priv;
613	int ret = -EINVAL;
614
615	dprintk("%s(frequency=%d)\n", __func__, c->frequency);
616
617	if ((state->current_frequency == c->frequency) &&
618	    (state->current_modulation == c->modulation))
619		return 0;
620
621	if (fe->ops.tuner_ops.set_params) {
622		if (fe->ops.i2c_gate_ctrl)
623			fe->ops.i2c_gate_ctrl(fe, 1);
624		ret = fe->ops.tuner_ops.set_params(fe);
625		if (fe->ops.i2c_gate_ctrl)
626			fe->ops.i2c_gate_ctrl(fe, 0);
627	}
628
629	if (ret < 0)
630		return ret;
631
632	/* Allow the tuner to settle */
633	if (zv_mode) {
634		dprintk("%s() increase tuner settling time for zv_mode\n",
635			__func__);
636		msleep(250);
637	} else
638		msleep(100);
639
640	au8522_enable_modulation(fe, c->modulation);
641
642	state->current_frequency = c->frequency;
643
644	return 0;
645}
646
647static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
648{
649	struct au8522_state *state = fe->demodulator_priv;
650	u8 reg;
651	u32 tuner_status = 0;
652
653	*status = 0;
654
655	if (state->current_modulation == VSB_8) {
656		dprintk("%s() Checking VSB_8\n", __func__);
657		reg = au8522_readreg(state, 0x4088);
658		if ((reg & 0x03) == 0x03)
659			*status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
660	} else {
661		dprintk("%s() Checking QAM\n", __func__);
662		reg = au8522_readreg(state, 0x4541);
663		if (reg & 0x80)
664			*status |= FE_HAS_VITERBI;
665		if (reg & 0x20)
666			*status |= FE_HAS_LOCK | FE_HAS_SYNC;
667	}
668
669	switch (state->config->status_mode) {
670	case AU8522_DEMODLOCKING:
671		dprintk("%s() DEMODLOCKING\n", __func__);
672		if (*status & FE_HAS_VITERBI)
673			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
674		break;
675	case AU8522_TUNERLOCKING:
676		/* Get the tuner status */
677		dprintk("%s() TUNERLOCKING\n", __func__);
678		if (fe->ops.tuner_ops.get_status) {
679			if (fe->ops.i2c_gate_ctrl)
680				fe->ops.i2c_gate_ctrl(fe, 1);
681
682			fe->ops.tuner_ops.get_status(fe, &tuner_status);
683
684			if (fe->ops.i2c_gate_ctrl)
685				fe->ops.i2c_gate_ctrl(fe, 0);
686		}
687		if (tuner_status)
688			*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
689		break;
690	}
691	state->fe_status = *status;
692
693	if (*status & FE_HAS_LOCK)
694		/* turn on LED, if it isn't on already */
695		au8522_led_ctrl(state, -1);
696	else
697		/* turn off LED */
698		au8522_led_ctrl(state, 0);
699
700	dprintk("%s() status 0x%08x\n", __func__, *status);
701
702	return 0;
703}
704
705static int au8522_led_status(struct au8522_state *state, const u16 *snr)
706{
707	struct au8522_led_config *led_config = state->config->led_cfg;
708	int led;
709	u16 strong;
710
711	/* bail out if we can't control an LED */
712	if (!led_config)
713		return 0;
714
715	if (0 == (state->fe_status & FE_HAS_LOCK))
716		return au8522_led_ctrl(state, 0);
717	else if (state->current_modulation == QAM_256)
718		strong = led_config->qam256_strong;
719	else if (state->current_modulation == QAM_64)
720		strong = led_config->qam64_strong;
721	else /* (state->current_modulation == VSB_8) */
722		strong = led_config->vsb8_strong;
723
724	if (*snr >= strong)
725		led = 2;
726	else
727		led = 1;
728
729	if ((state->led_state) &&
730	    (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
731		/* snr didn't change enough to bother
732		 * changing the color of the led */
733		return 0;
734
735	return au8522_led_ctrl(state, led);
736}
737
738static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
739{
740	struct au8522_state *state = fe->demodulator_priv;
741	int ret = -EINVAL;
742
743	dprintk("%s()\n", __func__);
744
745	if (state->current_modulation == QAM_256)
746		ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
747					    ARRAY_SIZE(qam256_mse2snr_tab),
748					    au8522_readreg(state, 0x4522),
749					    snr);
750	else if (state->current_modulation == QAM_64)
751		ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
752					    ARRAY_SIZE(qam64_mse2snr_tab),
753					    au8522_readreg(state, 0x4522),
754					    snr);
755	else /* VSB_8 */
756		ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
757					    ARRAY_SIZE(vsb_mse2snr_tab),
758					    au8522_readreg(state, 0x4311),
759					    snr);
760
761	if (state->config->led_cfg)
762		au8522_led_status(state, snr);
763
764	return ret;
765}
766
767static int au8522_read_signal_strength(struct dvb_frontend *fe,
768				       u16 *signal_strength)
769{
770	/* borrowed from lgdt330x.c
771	 *
772	 * Calculate strength from SNR up to 35dB
773	 * Even though the SNR can go higher than 35dB,
774	 * there is some comfort factor in having a range of
775	 * strong signals that can show at 100%
776	 */
777	u16 snr;
778	u32 tmp;
779	int ret = au8522_read_snr(fe, &snr);
780
781	*signal_strength = 0;
782
783	if (0 == ret) {
784		/* The following calculation method was chosen
785		 * purely for the sake of code re-use from the
786		 * other demod drivers that use this method */
787
788		/* Convert from SNR in dB * 10 to 8.24 fixed-point */
789		tmp = (snr * ((1 << 24) / 10));
790
791		/* Convert from 8.24 fixed-point to
792		 * scale the range 0 - 35*2^24 into 0 - 65535*/
793		if (tmp >= 8960 * 0x10000)
794			*signal_strength = 0xffff;
795		else
796			*signal_strength = tmp / 8960;
797	}
798
799	return ret;
800}
801
802static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
803{
804	struct au8522_state *state = fe->demodulator_priv;
805
806	if (state->current_modulation == VSB_8)
807		*ucblocks = au8522_readreg(state, 0x4087);
808	else
809		*ucblocks = au8522_readreg(state, 0x4543);
810
811	return 0;
812}
813
814static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
815{
816	return au8522_read_ucblocks(fe, ber);
817}
818
819static int au8522_get_frontend(struct dvb_frontend *fe)
820{
821	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
822	struct au8522_state *state = fe->demodulator_priv;
823
824	c->frequency = state->current_frequency;
825	c->modulation = state->current_modulation;
826
827	return 0;
828}
829
830static int au8522_get_tune_settings(struct dvb_frontend *fe,
831				    struct dvb_frontend_tune_settings *tune)
832{
833	tune->min_delay_ms = 1000;
834	return 0;
835}
836
837static struct dvb_frontend_ops au8522_ops;
838
839
840static void au8522_release(struct dvb_frontend *fe)
841{
842	struct au8522_state *state = fe->demodulator_priv;
843	au8522_release_state(state);
844}
845
846struct dvb_frontend *au8522_attach(const struct au8522_config *config,
847				   struct i2c_adapter *i2c)
848{
849	struct au8522_state *state = NULL;
850	int instance;
851
852	/* allocate memory for the internal state */
853	instance = au8522_get_state(&state, i2c, config->demod_address);
854	switch (instance) {
855	case 0:
856		dprintk("%s state allocation failed\n", __func__);
857		break;
858	case 1:
859		/* new demod instance */
860		dprintk("%s using new instance\n", __func__);
861		break;
862	default:
863		/* existing demod instance */
864		dprintk("%s using existing instance\n", __func__);
865		break;
866	}
867
868	/* setup the state */
869	state->config = config;
870	state->i2c = i2c;
871	state->operational_mode = AU8522_DIGITAL_MODE;
872
873	/* create dvb_frontend */
874	memcpy(&state->frontend.ops, &au8522_ops,
875	       sizeof(struct dvb_frontend_ops));
876	state->frontend.demodulator_priv = state;
877
878	state->frontend.ops.analog_ops.i2c_gate_ctrl = au8522_analog_i2c_gate_ctrl;
879
880	if (au8522_init(&state->frontend) != 0) {
881		printk(KERN_ERR "%s: Failed to initialize correctly\n",
882			__func__);
883		goto error;
884	}
885
886	/* Note: Leaving the I2C gate open here. */
887	au8522_i2c_gate_ctrl(&state->frontend, 1);
888
889	return &state->frontend;
890
891error:
892	au8522_release_state(state);
893	return NULL;
894}
895EXPORT_SYMBOL(au8522_attach);
896
897static struct dvb_frontend_ops au8522_ops = {
898	.delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
899	.info = {
900		.name			= "Auvitek AU8522 QAM/8VSB Frontend",
901		.frequency_min		= 54000000,
902		.frequency_max		= 858000000,
903		.frequency_stepsize	= 62500,
904		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
905	},
906
907	.init                 = au8522_init,
908	.sleep                = au8522_sleep,
909	.i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
910	.set_frontend         = au8522_set_frontend,
911	.get_frontend         = au8522_get_frontend,
912	.get_tune_settings    = au8522_get_tune_settings,
913	.read_status          = au8522_read_status,
914	.read_ber             = au8522_read_ber,
915	.read_signal_strength = au8522_read_signal_strength,
916	.read_snr             = au8522_read_snr,
917	.read_ucblocks        = au8522_read_ucblocks,
918	.release              = au8522_release,
919};
920
921module_param(debug, int, 0644);
922MODULE_PARM_DESC(debug, "Enable verbose debug messages");
923
924module_param(zv_mode, int, 0644);
925MODULE_PARM_DESC(zv_mode, "Turn on/off ZeeVee modulator compatability mode (default:on).\n"
926	"\t\ton - modified AU8522 QAM256 initialization.\n"
927	"\t\tProvides faster lock when using ZeeVee modulator based sources");
928
929MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
930MODULE_AUTHOR("Steven Toth");
931MODULE_LICENSE("GPL");
932