1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *    Support for Legend Silicon GB20600 (a.k.a DMB-TH) demodulator
4  *    LGS8913, LGS8GL5, LGS8G75
5  *    experimental support LGS8G42, LGS8G52
6  *
7  *    Copyright (C) 2007-2009 David T.L. Wong <davidtlwong@gmail.com>
8  *    Copyright (C) 2008 Sirius International (Hong Kong) Limited
9  *    Timothy Lee <timothy.lee@siriushk.com> (for initial work on LGS8GL5)
10  */
11 
12 #include <asm/div64.h>
13 #include <linux/firmware.h>
14 
15 #include <media/dvb_frontend.h>
16 
17 #include "lgs8gxx.h"
18 #include "lgs8gxx_priv.h"
19 
20 #define dprintk(args...) \
21 	do { \
22 		if (debug) \
23 			printk(KERN_DEBUG "lgs8gxx: " args); \
24 	} while (0)
25 
26 static int debug;
27 static int fake_signal_str = 1;
28 
29 #define LGS8GXX_FIRMWARE "lgs8g75.fw"
30 
31 module_param(debug, int, 0644);
32 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
33 
34 module_param(fake_signal_str, int, 0644);
35 MODULE_PARM_DESC(fake_signal_str, "fake signal strength for LGS8913."
36 "Signal strength calculation is slow.(default:on).");
37 
38 /* LGS8GXX internal helper functions */
39 
40 static int lgs8gxx_write_reg(struct lgs8gxx_state *priv, u8 reg, u8 data)
41 {
42 	int ret;
43 	u8 buf[] = { reg, data };
44 	struct i2c_msg msg = { .flags = 0, .buf = buf, .len = 2 };
45 
46 	msg.addr = priv->config->demod_address;
47 	if (priv->config->prod != LGS8GXX_PROD_LGS8G75 && reg >= 0xC0)
48 		msg.addr += 0x02;
49 
50 	if (debug >= 2)
51 		dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, data);
52 
53 	ret = i2c_transfer(priv->i2c, &msg, 1);
54 
55 	if (ret != 1)
56 		dprintk("%s: error reg=0x%x, data=0x%x, ret=%i\n",
57 			__func__, reg, data, ret);
58 
59 	return (ret != 1) ? -1 : 0;
60 }
61 
62 static int lgs8gxx_read_reg(struct lgs8gxx_state *priv, u8 reg, u8 *p_data)
63 {
64 	int ret;
65 	u8 dev_addr;
66 
67 	u8 b0[] = { reg };
68 	u8 b1[] = { 0 };
69 	struct i2c_msg msg[] = {
70 		{ .flags = 0, .buf = b0, .len = 1 },
71 		{ .flags = I2C_M_RD, .buf = b1, .len = 1 },
72 	};
73 
74 	dev_addr = priv->config->demod_address;
75 	if (priv->config->prod != LGS8GXX_PROD_LGS8G75 && reg >= 0xC0)
76 		dev_addr += 0x02;
77 	msg[1].addr =  msg[0].addr = dev_addr;
78 
79 	ret = i2c_transfer(priv->i2c, msg, 2);
80 	if (ret != 2) {
81 		dprintk("%s: error reg=0x%x, ret=%i\n", __func__, reg, ret);
82 		return -1;
83 	}
84 
85 	*p_data = b1[0];
86 	if (debug >= 2)
87 		dprintk("%s: reg=0x%02X, data=0x%02X\n", __func__, reg, b1[0]);
88 	return 0;
89 }
90 
91 static int lgs8gxx_soft_reset(struct lgs8gxx_state *priv)
92 {
93 	lgs8gxx_write_reg(priv, 0x02, 0x00);
94 	msleep(1);
95 	lgs8gxx_write_reg(priv, 0x02, 0x01);
96 	msleep(100);
97 
98 	return 0;
99 }
100 
101 static int wait_reg_mask(struct lgs8gxx_state *priv, u8 reg, u8 mask,
102 	u8 val, u8 delay, u8 tries)
103 {
104 	u8 t;
105 	int i;
106 
107 	for (i = 0; i < tries; i++) {
108 		lgs8gxx_read_reg(priv, reg, &t);
109 
110 		if ((t & mask) == val)
111 			return 0;
112 		msleep(delay);
113 	}
114 
115 	return 1;
116 }
117 
118 static int lgs8gxx_set_ad_mode(struct lgs8gxx_state *priv)
119 {
120 	const struct lgs8gxx_config *config = priv->config;
121 	u8 if_conf;
122 
123 	if_conf = 0x10; /* AGC output on, RF_AGC output off; */
124 
125 	if_conf |=
126 		((config->ext_adc) ? 0x80 : 0x00) |
127 		((config->if_neg_center) ? 0x04 : 0x00) |
128 		((config->if_freq == 0) ? 0x08 : 0x00) | /* Baseband */
129 		((config->adc_signed) ? 0x02 : 0x00) |
130 		((config->if_neg_edge) ? 0x01 : 0x00);
131 
132 	if (config->ext_adc &&
133 		(config->prod == LGS8GXX_PROD_LGS8G52)) {
134 		lgs8gxx_write_reg(priv, 0xBA, 0x40);
135 	}
136 
137 	lgs8gxx_write_reg(priv, 0x07, if_conf);
138 
139 	return 0;
140 }
141 
142 static int lgs8gxx_set_if_freq(struct lgs8gxx_state *priv, u32 freq /*in kHz*/)
143 {
144 	u64 val;
145 	u32 v32;
146 	u32 if_clk;
147 
148 	if_clk = priv->config->if_clk_freq;
149 
150 	val = freq;
151 	if (freq != 0) {
152 		val <<= 32;
153 		if (if_clk != 0)
154 			do_div(val, if_clk);
155 		v32 = val & 0xFFFFFFFF;
156 		dprintk("Set IF Freq to %dkHz\n", freq);
157 	} else {
158 		v32 = 0;
159 		dprintk("Set IF Freq to baseband\n");
160 	}
161 	dprintk("AFC_INIT_FREQ = 0x%08X\n", v32);
162 
163 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
164 		lgs8gxx_write_reg(priv, 0x08, 0xFF & (v32));
165 		lgs8gxx_write_reg(priv, 0x09, 0xFF & (v32 >> 8));
166 		lgs8gxx_write_reg(priv, 0x0A, 0xFF & (v32 >> 16));
167 		lgs8gxx_write_reg(priv, 0x0B, 0xFF & (v32 >> 24));
168 	} else {
169 		lgs8gxx_write_reg(priv, 0x09, 0xFF & (v32));
170 		lgs8gxx_write_reg(priv, 0x0A, 0xFF & (v32 >> 8));
171 		lgs8gxx_write_reg(priv, 0x0B, 0xFF & (v32 >> 16));
172 		lgs8gxx_write_reg(priv, 0x0C, 0xFF & (v32 >> 24));
173 	}
174 
175 	return 0;
176 }
177 
178 static int lgs8gxx_get_afc_phase(struct lgs8gxx_state *priv)
179 {
180 	u64 val;
181 	u32 v32 = 0;
182 	u8 reg_addr, t;
183 	int i;
184 
185 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
186 		reg_addr = 0x23;
187 	else
188 		reg_addr = 0x48;
189 
190 	for (i = 0; i < 4; i++) {
191 		lgs8gxx_read_reg(priv, reg_addr, &t);
192 		v32 <<= 8;
193 		v32 |= t;
194 		reg_addr--;
195 	}
196 
197 	val = v32;
198 	val *= priv->config->if_clk_freq;
199 	val >>= 32;
200 	dprintk("AFC = %u kHz\n", (u32)val);
201 	return 0;
202 }
203 
204 static int lgs8gxx_set_mode_auto(struct lgs8gxx_state *priv)
205 {
206 	u8 t;
207 	u8 prod = priv->config->prod;
208 
209 	if (prod == LGS8GXX_PROD_LGS8913)
210 		lgs8gxx_write_reg(priv, 0xC6, 0x01);
211 
212 	if (prod == LGS8GXX_PROD_LGS8G75) {
213 		lgs8gxx_read_reg(priv, 0x0C, &t);
214 		t &= (~0x04);
215 		lgs8gxx_write_reg(priv, 0x0C, t | 0x80);
216 		lgs8gxx_write_reg(priv, 0x39, 0x00);
217 		lgs8gxx_write_reg(priv, 0x3D, 0x04);
218 	} else if (prod == LGS8GXX_PROD_LGS8913 ||
219 		prod == LGS8GXX_PROD_LGS8GL5 ||
220 		prod == LGS8GXX_PROD_LGS8G42 ||
221 		prod == LGS8GXX_PROD_LGS8G52 ||
222 		prod == LGS8GXX_PROD_LGS8G54) {
223 		lgs8gxx_read_reg(priv, 0x7E, &t);
224 		lgs8gxx_write_reg(priv, 0x7E, t | 0x01);
225 
226 		/* clear FEC self reset */
227 		lgs8gxx_read_reg(priv, 0xC5, &t);
228 		lgs8gxx_write_reg(priv, 0xC5, t & 0xE0);
229 	}
230 
231 	if (prod == LGS8GXX_PROD_LGS8913) {
232 		/* FEC auto detect */
233 		lgs8gxx_write_reg(priv, 0xC1, 0x03);
234 
235 		lgs8gxx_read_reg(priv, 0x7C, &t);
236 		t = (t & 0x8C) | 0x03;
237 		lgs8gxx_write_reg(priv, 0x7C, t);
238 
239 		/* BER test mode */
240 		lgs8gxx_read_reg(priv, 0xC3, &t);
241 		t = (t & 0xEF) |  0x10;
242 		lgs8gxx_write_reg(priv, 0xC3, t);
243 	}
244 
245 	if (priv->config->prod == LGS8GXX_PROD_LGS8G52)
246 		lgs8gxx_write_reg(priv, 0xD9, 0x40);
247 
248 	return 0;
249 }
250 
251 static int lgs8gxx_set_mode_manual(struct lgs8gxx_state *priv)
252 {
253 	u8 t;
254 
255 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
256 		u8 t2;
257 		lgs8gxx_read_reg(priv, 0x0C, &t);
258 		t &= (~0x80);
259 		lgs8gxx_write_reg(priv, 0x0C, t);
260 
261 		lgs8gxx_read_reg(priv, 0x0C, &t);
262 		lgs8gxx_read_reg(priv, 0x19, &t2);
263 
264 		if (((t&0x03) == 0x01) && (t2&0x01)) {
265 			lgs8gxx_write_reg(priv, 0x6E, 0x05);
266 			lgs8gxx_write_reg(priv, 0x39, 0x02);
267 			lgs8gxx_write_reg(priv, 0x39, 0x03);
268 			lgs8gxx_write_reg(priv, 0x3D, 0x05);
269 			lgs8gxx_write_reg(priv, 0x3E, 0x28);
270 			lgs8gxx_write_reg(priv, 0x53, 0x80);
271 		} else {
272 			lgs8gxx_write_reg(priv, 0x6E, 0x3F);
273 			lgs8gxx_write_reg(priv, 0x39, 0x00);
274 			lgs8gxx_write_reg(priv, 0x3D, 0x04);
275 		}
276 
277 		lgs8gxx_soft_reset(priv);
278 		return 0;
279 	}
280 
281 	/* turn off auto-detect; manual settings */
282 	lgs8gxx_write_reg(priv, 0x7E, 0);
283 	if (priv->config->prod == LGS8GXX_PROD_LGS8913)
284 		lgs8gxx_write_reg(priv, 0xC1, 0);
285 
286 	lgs8gxx_read_reg(priv, 0xC5, &t);
287 	t = (t & 0xE0) | 0x06;
288 	lgs8gxx_write_reg(priv, 0xC5, t);
289 
290 	lgs8gxx_soft_reset(priv);
291 
292 	return 0;
293 }
294 
295 static int lgs8gxx_is_locked(struct lgs8gxx_state *priv, u8 *locked)
296 {
297 	int ret = 0;
298 	u8 t;
299 
300 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
301 		ret = lgs8gxx_read_reg(priv, 0x13, &t);
302 	else
303 		ret = lgs8gxx_read_reg(priv, 0x4B, &t);
304 	if (ret != 0)
305 		return ret;
306 
307 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
308 		*locked = ((t & 0x80) == 0x80) ? 1 : 0;
309 	else
310 		*locked = ((t & 0xC0) == 0xC0) ? 1 : 0;
311 	return 0;
312 }
313 
314 /* Wait for Code Acquisition Lock */
315 static int lgs8gxx_wait_ca_lock(struct lgs8gxx_state *priv, u8 *locked)
316 {
317 	int ret = 0;
318 	u8 reg, mask, val;
319 
320 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
321 		reg = 0x13;
322 		mask = 0x80;
323 		val = 0x80;
324 	} else {
325 		reg = 0x4B;
326 		mask = 0xC0;
327 		val = 0xC0;
328 	}
329 
330 	ret = wait_reg_mask(priv, reg, mask, val, 50, 40);
331 	*locked = (ret == 0) ? 1 : 0;
332 
333 	return 0;
334 }
335 
336 static int lgs8gxx_is_autodetect_finished(struct lgs8gxx_state *priv,
337 					  u8 *finished)
338 {
339 	int ret = 0;
340 	u8 reg, mask, val;
341 
342 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
343 		reg = 0x1f;
344 		mask = 0xC0;
345 		val = 0x80;
346 	} else {
347 		reg = 0xA4;
348 		mask = 0x03;
349 		val = 0x01;
350 	}
351 
352 	ret = wait_reg_mask(priv, reg, mask, val, 10, 20);
353 	*finished = (ret == 0) ? 1 : 0;
354 
355 	return 0;
356 }
357 
358 static int lgs8gxx_autolock_gi(struct lgs8gxx_state *priv, u8 gi, u8 cpn,
359 	u8 *locked)
360 {
361 	int err = 0;
362 	u8 ad_fini = 0;
363 	u8 t1, t2;
364 
365 	if (gi == GI_945)
366 		dprintk("try GI 945\n");
367 	else if (gi == GI_595)
368 		dprintk("try GI 595\n");
369 	else if (gi == GI_420)
370 		dprintk("try GI 420\n");
371 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
372 		lgs8gxx_read_reg(priv, 0x0C, &t1);
373 		lgs8gxx_read_reg(priv, 0x18, &t2);
374 		t1 &= ~(GI_MASK);
375 		t1 |= gi;
376 		t2 &= 0xFE;
377 		t2 |= cpn ? 0x01 : 0x00;
378 		lgs8gxx_write_reg(priv, 0x0C, t1);
379 		lgs8gxx_write_reg(priv, 0x18, t2);
380 	} else {
381 		lgs8gxx_write_reg(priv, 0x04, gi);
382 	}
383 	lgs8gxx_soft_reset(priv);
384 	err = lgs8gxx_wait_ca_lock(priv, locked);
385 	if (err || !(*locked))
386 		return err;
387 	err = lgs8gxx_is_autodetect_finished(priv, &ad_fini);
388 	if (err != 0)
389 		return err;
390 	if (ad_fini) {
391 		dprintk("auto detect finished\n");
392 	} else
393 		*locked = 0;
394 
395 	return 0;
396 }
397 
398 static int lgs8gxx_auto_detect(struct lgs8gxx_state *priv,
399 			       u8 *detected_param, u8 *gi)
400 {
401 	int i, j;
402 	int err = 0;
403 	u8 locked = 0, tmp_gi;
404 
405 	dprintk("%s\n", __func__);
406 
407 	lgs8gxx_set_mode_auto(priv);
408 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
409 		lgs8gxx_write_reg(priv, 0x67, 0xAA);
410 		lgs8gxx_write_reg(priv, 0x6E, 0x3F);
411 	} else {
412 		/* Guard Interval */
413 		lgs8gxx_write_reg(priv, 0x03, 00);
414 	}
415 
416 	for (i = 0; i < 2; i++) {
417 		for (j = 0; j < 2; j++) {
418 			tmp_gi = GI_945;
419 			err = lgs8gxx_autolock_gi(priv, GI_945, j, &locked);
420 			if (err)
421 				goto out;
422 			if (locked)
423 				goto locked;
424 		}
425 		for (j = 0; j < 2; j++) {
426 			tmp_gi = GI_420;
427 			err = lgs8gxx_autolock_gi(priv, GI_420, j, &locked);
428 			if (err)
429 				goto out;
430 			if (locked)
431 				goto locked;
432 		}
433 		tmp_gi = GI_595;
434 		err = lgs8gxx_autolock_gi(priv, GI_595, 1, &locked);
435 		if (err)
436 			goto out;
437 		if (locked)
438 			goto locked;
439 	}
440 
441 locked:
442 	if ((err == 0) && (locked == 1)) {
443 		u8 t;
444 
445 		if (priv->config->prod != LGS8GXX_PROD_LGS8G75) {
446 			lgs8gxx_read_reg(priv, 0xA2, &t);
447 			*detected_param = t;
448 		} else {
449 			lgs8gxx_read_reg(priv, 0x1F, &t);
450 			*detected_param = t & 0x3F;
451 		}
452 
453 		if (tmp_gi == GI_945)
454 			dprintk("GI 945 locked\n");
455 		else if (tmp_gi == GI_595)
456 			dprintk("GI 595 locked\n");
457 		else if (tmp_gi == GI_420)
458 			dprintk("GI 420 locked\n");
459 		*gi = tmp_gi;
460 	}
461 	if (!locked)
462 		err = -1;
463 
464 out:
465 	return err;
466 }
467 
468 static void lgs8gxx_auto_lock(struct lgs8gxx_state *priv)
469 {
470 	s8 err;
471 	u8 gi = 0x2;
472 	u8 detected_param = 0;
473 
474 	err = lgs8gxx_auto_detect(priv, &detected_param, &gi);
475 
476 	if (err != 0) {
477 		dprintk("lgs8gxx_auto_detect failed\n");
478 	} else
479 		dprintk("detected param = 0x%02X\n", detected_param);
480 
481 	/* Apply detected parameters */
482 	if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
483 		u8 inter_leave_len = detected_param & TIM_MASK ;
484 		/* Fix 8913 time interleaver detection bug */
485 		inter_leave_len = (inter_leave_len == TIM_MIDDLE) ? 0x60 : 0x40;
486 		detected_param &= CF_MASK | SC_MASK  | LGS_FEC_MASK;
487 		detected_param |= inter_leave_len;
488 	}
489 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
490 		u8 t;
491 		lgs8gxx_read_reg(priv, 0x19, &t);
492 		t &= 0x81;
493 		t |= detected_param << 1;
494 		lgs8gxx_write_reg(priv, 0x19, t);
495 	} else {
496 		lgs8gxx_write_reg(priv, 0x7D, detected_param);
497 		if (priv->config->prod == LGS8GXX_PROD_LGS8913)
498 			lgs8gxx_write_reg(priv, 0xC0, detected_param);
499 	}
500 	/* lgs8gxx_soft_reset(priv); */
501 
502 	/* Enter manual mode */
503 	lgs8gxx_set_mode_manual(priv);
504 
505 	switch (gi) {
506 	case GI_945:
507 		priv->curr_gi = 945; break;
508 	case GI_595:
509 		priv->curr_gi = 595; break;
510 	case GI_420:
511 		priv->curr_gi = 420; break;
512 	default:
513 		priv->curr_gi = 945; break;
514 	}
515 }
516 
517 static int lgs8gxx_set_mpeg_mode(struct lgs8gxx_state *priv,
518 	u8 serial, u8 clk_pol, u8 clk_gated)
519 {
520 	int ret = 0;
521 	u8 t, reg_addr;
522 
523 	reg_addr = (priv->config->prod == LGS8GXX_PROD_LGS8G75) ? 0x30 : 0xC2;
524 	ret = lgs8gxx_read_reg(priv, reg_addr, &t);
525 	if (ret != 0)
526 		return ret;
527 
528 	t &= 0xF8;
529 	t |= serial ? TS_SERIAL : TS_PARALLEL;
530 	t |= clk_pol ? TS_CLK_INVERTED : TS_CLK_NORMAL;
531 	t |= clk_gated ? TS_CLK_GATED : TS_CLK_FREERUN;
532 
533 	ret = lgs8gxx_write_reg(priv, reg_addr, t);
534 	if (ret != 0)
535 		return ret;
536 
537 	return 0;
538 }
539 
540 /* A/D input peak-to-peak voltage range */
541 static int lgs8g75_set_adc_vpp(struct lgs8gxx_state *priv,
542 	u8 sel)
543 {
544 	u8 r26 = 0x73, r27 = 0x90;
545 
546 	if (priv->config->prod != LGS8GXX_PROD_LGS8G75)
547 		return 0;
548 
549 	r26 |= (sel & 0x01) << 7;
550 	r27 |= (sel & 0x02) >> 1;
551 	lgs8gxx_write_reg(priv, 0x26, r26);
552 	lgs8gxx_write_reg(priv, 0x27, r27);
553 
554 	return 0;
555 }
556 
557 /* LGS8913 demod frontend functions */
558 
559 static int lgs8913_init(struct lgs8gxx_state *priv)
560 {
561 	u8 t;
562 
563 	/* LGS8913 specific */
564 	lgs8gxx_write_reg(priv, 0xc1, 0x3);
565 
566 	lgs8gxx_read_reg(priv, 0x7c, &t);
567 	lgs8gxx_write_reg(priv, 0x7c, (t&0x8c) | 0x3);
568 
569 	/* LGS8913 specific */
570 	lgs8gxx_read_reg(priv, 0xc3, &t);
571 	lgs8gxx_write_reg(priv, 0xc3, t&0x10);
572 
573 
574 	return 0;
575 }
576 
577 static int lgs8g75_init_data(struct lgs8gxx_state *priv)
578 {
579 	const struct firmware *fw;
580 	int rc;
581 	int i;
582 
583 	rc = request_firmware(&fw, LGS8GXX_FIRMWARE, &priv->i2c->dev);
584 	if (rc)
585 		return rc;
586 
587 	lgs8gxx_write_reg(priv, 0xC6, 0x40);
588 
589 	lgs8gxx_write_reg(priv, 0x3D, 0x04);
590 	lgs8gxx_write_reg(priv, 0x39, 0x00);
591 
592 	lgs8gxx_write_reg(priv, 0x3A, 0x00);
593 	lgs8gxx_write_reg(priv, 0x38, 0x00);
594 	lgs8gxx_write_reg(priv, 0x3B, 0x00);
595 	lgs8gxx_write_reg(priv, 0x38, 0x00);
596 
597 	for (i = 0; i < fw->size; i++) {
598 		lgs8gxx_write_reg(priv, 0x38, 0x00);
599 		lgs8gxx_write_reg(priv, 0x3A, (u8)(i&0xff));
600 		lgs8gxx_write_reg(priv, 0x3B, (u8)(i>>8));
601 		lgs8gxx_write_reg(priv, 0x3C, fw->data[i]);
602 	}
603 
604 	lgs8gxx_write_reg(priv, 0x38, 0x00);
605 
606 	release_firmware(fw);
607 	return 0;
608 }
609 
610 static int lgs8gxx_init(struct dvb_frontend *fe)
611 {
612 	struct lgs8gxx_state *priv =
613 		(struct lgs8gxx_state *)fe->demodulator_priv;
614 	const struct lgs8gxx_config *config = priv->config;
615 	u8 data = 0;
616 	s8 err;
617 	dprintk("%s\n", __func__);
618 
619 	lgs8gxx_read_reg(priv, 0, &data);
620 	dprintk("reg 0 = 0x%02X\n", data);
621 
622 	if (config->prod == LGS8GXX_PROD_LGS8G75)
623 		lgs8g75_set_adc_vpp(priv, config->adc_vpp);
624 
625 	/* Setup MPEG output format */
626 	err = lgs8gxx_set_mpeg_mode(priv, config->serial_ts,
627 				    config->ts_clk_pol,
628 				    config->ts_clk_gated);
629 	if (err != 0)
630 		return -EIO;
631 
632 	if (config->prod == LGS8GXX_PROD_LGS8913)
633 		lgs8913_init(priv);
634 	lgs8gxx_set_if_freq(priv, priv->config->if_freq);
635 	lgs8gxx_set_ad_mode(priv);
636 
637 	return 0;
638 }
639 
640 static void lgs8gxx_release(struct dvb_frontend *fe)
641 {
642 	struct lgs8gxx_state *state = fe->demodulator_priv;
643 	dprintk("%s\n", __func__);
644 
645 	kfree(state);
646 }
647 
648 
649 static int lgs8gxx_write(struct dvb_frontend *fe, const u8 buf[], int len)
650 {
651 	struct lgs8gxx_state *priv = fe->demodulator_priv;
652 
653 	if (len != 2)
654 		return -EINVAL;
655 
656 	return lgs8gxx_write_reg(priv, buf[0], buf[1]);
657 }
658 
659 static int lgs8gxx_set_fe(struct dvb_frontend *fe)
660 {
661 	struct dtv_frontend_properties *fe_params = &fe->dtv_property_cache;
662 	struct lgs8gxx_state *priv = fe->demodulator_priv;
663 
664 	dprintk("%s\n", __func__);
665 
666 	/* set frequency */
667 	if (fe->ops.tuner_ops.set_params) {
668 		fe->ops.tuner_ops.set_params(fe);
669 		if (fe->ops.i2c_gate_ctrl)
670 			fe->ops.i2c_gate_ctrl(fe, 0);
671 	}
672 
673 	/* start auto lock */
674 	lgs8gxx_auto_lock(priv);
675 
676 	msleep(10);
677 
678 	/* TODO: get real readings from device */
679 
680 	/* bandwidth */
681 	fe_params->bandwidth_hz = 8000000;
682 
683 	fe_params->code_rate_HP = FEC_AUTO;
684 	fe_params->code_rate_LP = FEC_AUTO;
685 
686 	fe_params->modulation = QAM_AUTO;
687 
688 	/* transmission mode */
689 	fe_params->transmission_mode = TRANSMISSION_MODE_AUTO;
690 
691 	/* guard interval */
692 	fe_params->guard_interval = GUARD_INTERVAL_AUTO;
693 
694 	/* hierarchy */
695 	fe_params->hierarchy = HIERARCHY_NONE;
696 
697 	return 0;
698 }
699 
700 static
701 int lgs8gxx_get_tune_settings(struct dvb_frontend *fe,
702 			      struct dvb_frontend_tune_settings *fesettings)
703 {
704 	/* FIXME: copy from tda1004x.c */
705 	fesettings->min_delay_ms = 800;
706 	fesettings->step_size = 0;
707 	fesettings->max_drift = 0;
708 	return 0;
709 }
710 
711 static int lgs8gxx_read_status(struct dvb_frontend *fe,
712 			       enum fe_status *fe_status)
713 {
714 	struct lgs8gxx_state *priv = fe->demodulator_priv;
715 	s8 ret;
716 	u8 t, locked = 0;
717 
718 	dprintk("%s\n", __func__);
719 	*fe_status = 0;
720 
721 	lgs8gxx_get_afc_phase(priv);
722 	lgs8gxx_is_locked(priv, &locked);
723 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
724 		if (locked)
725 			*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
726 				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
727 		return 0;
728 	}
729 
730 	ret = lgs8gxx_read_reg(priv, 0x4B, &t);
731 	if (ret != 0)
732 		return -EIO;
733 
734 	dprintk("Reg 0x4B: 0x%02X\n", t);
735 
736 	*fe_status = 0;
737 	if (priv->config->prod == LGS8GXX_PROD_LGS8913) {
738 		if ((t & 0x40) == 0x40)
739 			*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
740 		if ((t & 0x80) == 0x80)
741 			*fe_status |= FE_HAS_VITERBI | FE_HAS_SYNC |
742 				FE_HAS_LOCK;
743 	} else {
744 		if ((t & 0x80) == 0x80)
745 			*fe_status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
746 				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
747 	}
748 
749 	/* success */
750 	dprintk("%s: fe_status=0x%x\n", __func__, *fe_status);
751 	return 0;
752 }
753 
754 static int lgs8gxx_read_signal_agc(struct lgs8gxx_state *priv, u16 *signal)
755 {
756 	u16 v;
757 	u8 agc_lvl[2], cat;
758 
759 	dprintk("%s()\n", __func__);
760 	lgs8gxx_read_reg(priv, 0x3F, &agc_lvl[0]);
761 	lgs8gxx_read_reg(priv, 0x3E, &agc_lvl[1]);
762 
763 	v = agc_lvl[0];
764 	v <<= 8;
765 	v |= agc_lvl[1];
766 
767 	dprintk("agc_lvl: 0x%04X\n", v);
768 
769 	if (v < 0x100)
770 		cat = 0;
771 	else if (v < 0x190)
772 		cat = 5;
773 	else if (v < 0x2A8)
774 		cat = 4;
775 	else if (v < 0x381)
776 		cat = 3;
777 	else if (v < 0x400)
778 		cat = 2;
779 	else if (v == 0x400)
780 		cat = 1;
781 	else
782 		cat = 0;
783 
784 	*signal = cat * 65535 / 5;
785 
786 	return 0;
787 }
788 
789 static int lgs8913_read_signal_strength(struct lgs8gxx_state *priv, u16 *signal)
790 {
791 	u8 t; s8 ret;
792 	s16 max_strength = 0;
793 	u8 str;
794 	u16 i, gi = priv->curr_gi;
795 
796 	dprintk("%s\n", __func__);
797 
798 	ret = lgs8gxx_read_reg(priv, 0x4B, &t);
799 	if (ret != 0)
800 		return -EIO;
801 
802 	if (fake_signal_str) {
803 		if ((t & 0xC0) == 0xC0) {
804 			dprintk("Fake signal strength\n");
805 			*signal = 0x7FFF;
806 		} else
807 			*signal = 0;
808 		return 0;
809 	}
810 
811 	dprintk("gi = %d\n", gi);
812 	for (i = 0; i < gi; i++) {
813 
814 		if ((i & 0xFF) == 0)
815 			lgs8gxx_write_reg(priv, 0x84, 0x03 & (i >> 8));
816 		lgs8gxx_write_reg(priv, 0x83, i & 0xFF);
817 
818 		lgs8gxx_read_reg(priv, 0x94, &str);
819 		if (max_strength < str)
820 			max_strength = str;
821 	}
822 
823 	*signal = max_strength;
824 	dprintk("%s: signal=0x%02X\n", __func__, *signal);
825 
826 	lgs8gxx_read_reg(priv, 0x95, &t);
827 	dprintk("%s: AVG Noise=0x%02X\n", __func__, t);
828 
829 	return 0;
830 }
831 
832 static int lgs8g75_read_signal_strength(struct lgs8gxx_state *priv, u16 *signal)
833 {
834 	u8 t;
835 	s16 v = 0;
836 
837 	dprintk("%s\n", __func__);
838 
839 	lgs8gxx_read_reg(priv, 0xB1, &t);
840 	v |= t;
841 	v <<= 8;
842 	lgs8gxx_read_reg(priv, 0xB0, &t);
843 	v |= t;
844 
845 	*signal = v;
846 	dprintk("%s: signal=0x%02X\n", __func__, *signal);
847 
848 	return 0;
849 }
850 
851 static int lgs8gxx_read_signal_strength(struct dvb_frontend *fe, u16 *signal)
852 {
853 	struct lgs8gxx_state *priv = fe->demodulator_priv;
854 
855 	if (priv->config->prod == LGS8GXX_PROD_LGS8913)
856 		return lgs8913_read_signal_strength(priv, signal);
857 	else if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
858 		return lgs8g75_read_signal_strength(priv, signal);
859 	else
860 		return lgs8gxx_read_signal_agc(priv, signal);
861 }
862 
863 static int lgs8gxx_read_snr(struct dvb_frontend *fe, u16 *snr)
864 {
865 	struct lgs8gxx_state *priv = fe->demodulator_priv;
866 	u8 t;
867 	*snr = 0;
868 
869 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75)
870 		lgs8gxx_read_reg(priv, 0x34, &t);
871 	else
872 		lgs8gxx_read_reg(priv, 0x95, &t);
873 	dprintk("AVG Noise=0x%02X\n", t);
874 	*snr = 256 - t;
875 	*snr <<= 8;
876 	dprintk("snr=0x%x\n", *snr);
877 
878 	return 0;
879 }
880 
881 static int lgs8gxx_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
882 {
883 	*ucblocks = 0;
884 	dprintk("%s: ucblocks=0x%x\n", __func__, *ucblocks);
885 	return 0;
886 }
887 
888 static void packet_counter_start(struct lgs8gxx_state *priv)
889 {
890 	u8 orig, t;
891 
892 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
893 		lgs8gxx_read_reg(priv, 0x30, &orig);
894 		orig &= 0xE7;
895 		t = orig | 0x10;
896 		lgs8gxx_write_reg(priv, 0x30, t);
897 		t = orig | 0x18;
898 		lgs8gxx_write_reg(priv, 0x30, t);
899 		t = orig | 0x10;
900 		lgs8gxx_write_reg(priv, 0x30, t);
901 	} else {
902 		lgs8gxx_write_reg(priv, 0xC6, 0x01);
903 		lgs8gxx_write_reg(priv, 0xC6, 0x41);
904 		lgs8gxx_write_reg(priv, 0xC6, 0x01);
905 	}
906 }
907 
908 static void packet_counter_stop(struct lgs8gxx_state *priv)
909 {
910 	u8 t;
911 
912 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
913 		lgs8gxx_read_reg(priv, 0x30, &t);
914 		t &= 0xE7;
915 		lgs8gxx_write_reg(priv, 0x30, t);
916 	} else {
917 		lgs8gxx_write_reg(priv, 0xC6, 0x81);
918 	}
919 }
920 
921 static int lgs8gxx_read_ber(struct dvb_frontend *fe, u32 *ber)
922 {
923 	struct lgs8gxx_state *priv = fe->demodulator_priv;
924 	u8 reg_err, reg_total, t;
925 	u32 total_cnt = 0, err_cnt = 0;
926 	int i;
927 
928 	dprintk("%s\n", __func__);
929 
930 	packet_counter_start(priv);
931 	msleep(200);
932 	packet_counter_stop(priv);
933 
934 	if (priv->config->prod == LGS8GXX_PROD_LGS8G75) {
935 		reg_total = 0x28; reg_err = 0x2C;
936 	} else {
937 		reg_total = 0xD0; reg_err = 0xD4;
938 	}
939 
940 	for (i = 0; i < 4; i++) {
941 		total_cnt <<= 8;
942 		lgs8gxx_read_reg(priv, reg_total+3-i, &t);
943 		total_cnt |= t;
944 	}
945 	for (i = 0; i < 4; i++) {
946 		err_cnt <<= 8;
947 		lgs8gxx_read_reg(priv, reg_err+3-i, &t);
948 		err_cnt |= t;
949 	}
950 	dprintk("error=%d total=%d\n", err_cnt, total_cnt);
951 
952 	if (total_cnt == 0)
953 		*ber = 0;
954 	else
955 		*ber = err_cnt * 100 / total_cnt;
956 
957 	dprintk("%s: ber=0x%x\n", __func__, *ber);
958 	return 0;
959 }
960 
961 static int lgs8gxx_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
962 {
963 	struct lgs8gxx_state *priv = fe->demodulator_priv;
964 
965 	if (priv->config->tuner_address == 0)
966 		return 0;
967 	if (enable) {
968 		u8 v = 0x80 | priv->config->tuner_address;
969 		return lgs8gxx_write_reg(priv, 0x01, v);
970 	}
971 	return lgs8gxx_write_reg(priv, 0x01, 0);
972 }
973 
974 static const struct dvb_frontend_ops lgs8gxx_ops = {
975 	.delsys = { SYS_DTMB },
976 	.info = {
977 		.name = "Legend Silicon LGS8913/LGS8GXX DMB-TH",
978 		.frequency_min_hz = 474 * MHz,
979 		.frequency_max_hz = 858 * MHz,
980 		.frequency_stepsize_hz = 10 * kHz,
981 		.caps =
982 			FE_CAN_FEC_AUTO |
983 			FE_CAN_QAM_AUTO |
984 			FE_CAN_TRANSMISSION_MODE_AUTO |
985 			FE_CAN_GUARD_INTERVAL_AUTO
986 	},
987 
988 	.release = lgs8gxx_release,
989 
990 	.init = lgs8gxx_init,
991 	.write = lgs8gxx_write,
992 	.i2c_gate_ctrl = lgs8gxx_i2c_gate_ctrl,
993 
994 	.set_frontend = lgs8gxx_set_fe,
995 	.get_tune_settings = lgs8gxx_get_tune_settings,
996 
997 	.read_status = lgs8gxx_read_status,
998 	.read_ber = lgs8gxx_read_ber,
999 	.read_signal_strength = lgs8gxx_read_signal_strength,
1000 	.read_snr = lgs8gxx_read_snr,
1001 	.read_ucblocks = lgs8gxx_read_ucblocks,
1002 };
1003 
1004 struct dvb_frontend *lgs8gxx_attach(const struct lgs8gxx_config *config,
1005 	struct i2c_adapter *i2c)
1006 {
1007 	struct lgs8gxx_state *priv = NULL;
1008 	u8 data = 0;
1009 
1010 	dprintk("%s()\n", __func__);
1011 
1012 	if (config == NULL || i2c == NULL)
1013 		return NULL;
1014 
1015 	priv = kzalloc(sizeof(struct lgs8gxx_state), GFP_KERNEL);
1016 	if (priv == NULL)
1017 		goto error_out;
1018 
1019 	priv->config = config;
1020 	priv->i2c = i2c;
1021 
1022 	/* check if the demod is there */
1023 	if (lgs8gxx_read_reg(priv, 0, &data) != 0) {
1024 		dprintk("%s lgs8gxx not found at i2c addr 0x%02X\n",
1025 			__func__, priv->config->demod_address);
1026 		goto error_out;
1027 	}
1028 
1029 	lgs8gxx_read_reg(priv, 1, &data);
1030 
1031 	memcpy(&priv->frontend.ops, &lgs8gxx_ops,
1032 	       sizeof(struct dvb_frontend_ops));
1033 	priv->frontend.demodulator_priv = priv;
1034 
1035 	if (config->prod == LGS8GXX_PROD_LGS8G75)
1036 		lgs8g75_init_data(priv);
1037 
1038 	return &priv->frontend;
1039 
1040 error_out:
1041 	dprintk("%s() error_out\n", __func__);
1042 	kfree(priv);
1043 	return NULL;
1044 
1045 }
1046 EXPORT_SYMBOL(lgs8gxx_attach);
1047 
1048 MODULE_DESCRIPTION("Legend Silicon LGS8913/LGS8GXX DMB-TH demodulator driver");
1049 MODULE_AUTHOR("David T. L. Wong <davidtlwong@gmail.com>");
1050 MODULE_LICENSE("GPL");
1051 MODULE_FIRMWARE(LGS8GXX_FIRMWARE);
1052