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
19static int debug;
20static int zv_mode = 1; /* default to on */
21
22#define dprintk(arg...)\
23	do { if (debug)\
24		printk(arg);\
25	} while (0)
26
27struct mse2snr_tab {
28	u16 val;
29	u16 data;
30};
31
32/* VSB SNR lookup table */
33static 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 */
67static 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 */
148static 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
215static 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
232static 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 */
270static 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 */
303static 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 */
382static 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
460static 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
541static 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 */
596static 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
634static 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
692static 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
725static 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
754static 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
789static 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
801static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
802{
803	return au8522_read_ucblocks(fe, ber);
804}
805
806static 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
817static 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
824static const struct dvb_frontend_ops au8522_ops;
825
826
827static void au8522_release(struct dvb_frontend *fe)
828{
829	struct au8522_state *state = fe->demodulator_priv;
830	au8522_release_state(state);
831}
832
833struct 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
878error:
879	au8522_release_state(state);
880	return NULL;
881}
882EXPORT_SYMBOL_GPL(au8522_attach);
883
884static 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
908module_param(debug, int, 0644);
909MODULE_PARM_DESC(debug, "Enable verbose debug messages");
910
911module_param(zv_mode, int, 0644);
912MODULE_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
916MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
917MODULE_AUTHOR("Steven Toth");
918MODULE_LICENSE("GPL");
919