1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3     Driver for VES1893 and VES1993 QPSK Demodulators
4 
5     Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
6     Copyright (C) 2001 Ronny Strutz <3des@elitedvb.de>
7     Copyright (C) 2002 Dennis Noermann <dennis.noermann@noernet.de>
8     Copyright (C) 2002-2003 Andreas Oberritter <obi@linuxtv.org>
9 
10 
11 */
12 
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
19 
20 #include <media/dvb_frontend.h>
21 #include "ves1x93.h"
22 
23 
24 struct ves1x93_state {
25 	struct i2c_adapter* i2c;
26 	/* configuration settings */
27 	const struct ves1x93_config* config;
28 	struct dvb_frontend frontend;
29 
30 	/* previous uncorrected block counter */
31 	enum fe_spectral_inversion inversion;
32 	u8 *init_1x93_tab;
33 	u8 *init_1x93_wtab;
34 	u8 tab_size;
35 	u8 demod_type;
36 	u32 frequency;
37 };
38 
39 static int debug;
40 #define dprintk	if (debug) printk
41 
42 #define DEMOD_VES1893		0
43 #define DEMOD_VES1993		1
44 
45 static u8 init_1893_tab [] = {
46 	0x01, 0xa4, 0x35, 0x80, 0x2a, 0x0b, 0x55, 0xc4,
47 	0x09, 0x69, 0x00, 0x86, 0x4c, 0x28, 0x7f, 0x00,
48 	0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
49 	0x80, 0x00, 0x21, 0xb0, 0x14, 0x00, 0xdc, 0x00,
50 	0x81, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
51 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
52 	0x00, 0x55, 0x00, 0x00, 0x7f, 0x00
53 };
54 
55 static u8 init_1993_tab [] = {
56 	0x00, 0x9c, 0x35, 0x80, 0x6a, 0x09, 0x72, 0x8c,
57 	0x09, 0x6b, 0x00, 0x00, 0x4c, 0x08, 0x00, 0x00,
58 	0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
59 	0x80, 0x40, 0x21, 0xb0, 0x00, 0x00, 0x00, 0x10,
60 	0x81, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
61 	0x00, 0x00, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00,
62 	0x00, 0x55, 0x03, 0x00, 0x00, 0x00, 0x00, 0x03,
63 	0x00, 0x00, 0x0e, 0x80, 0x00
64 };
65 
66 static u8 init_1893_wtab[] =
67 {
68 	1,1,1,1,1,1,1,1, 1,1,0,0,1,1,0,0,
69 	0,1,0,0,0,0,0,0, 1,0,1,1,0,0,0,1,
70 	1,1,1,0,0,0,0,0, 0,0,1,1,0,0,0,0,
71 	1,1,1,0,1,1
72 };
73 
74 static u8 init_1993_wtab[] =
75 {
76 	1,1,1,1,1,1,1,1, 1,1,0,0,1,1,0,0,
77 	0,1,0,0,0,0,0,0, 1,1,1,1,0,0,0,1,
78 	1,1,1,0,0,0,0,0, 0,0,1,1,0,0,0,0,
79 	1,1,1,0,1,1,1,1, 1,1,1,1,1
80 };
81 
82 static int ves1x93_writereg (struct ves1x93_state* state, u8 reg, u8 data)
83 {
84 	u8 buf [] = { 0x00, reg, data };
85 	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 3 };
86 	int err;
87 
88 	if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
89 		dprintk ("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __func__, err, reg, data);
90 		return -EREMOTEIO;
91 	}
92 
93 	return 0;
94 }
95 
96 static u8 ves1x93_readreg (struct ves1x93_state* state, u8 reg)
97 {
98 	int ret;
99 	u8 b0 [] = { 0x00, reg };
100 	u8 b1 [] = { 0 };
101 	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
102 			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
103 
104 	ret = i2c_transfer (state->i2c, msg, 2);
105 
106 	if (ret != 2) return ret;
107 
108 	return b1[0];
109 }
110 
111 static int ves1x93_clr_bit (struct ves1x93_state* state)
112 {
113 	msleep(10);
114 	ves1x93_writereg (state, 0, state->init_1x93_tab[0] & 0xfe);
115 	ves1x93_writereg (state, 0, state->init_1x93_tab[0]);
116 	msleep(50);
117 	return 0;
118 }
119 
120 static int ves1x93_set_inversion(struct ves1x93_state *state,
121 				 enum fe_spectral_inversion inversion)
122 {
123 	u8 val;
124 
125 	/*
126 	 * inversion on/off are interchanged because i and q seem to
127 	 * be swapped on the hardware
128 	 */
129 
130 	switch (inversion) {
131 	case INVERSION_OFF:
132 		val = 0xc0;
133 		break;
134 	case INVERSION_ON:
135 		val = 0x80;
136 		break;
137 	case INVERSION_AUTO:
138 		val = 0x00;
139 		break;
140 	default:
141 		return -EINVAL;
142 	}
143 
144 	return ves1x93_writereg (state, 0x0c, (state->init_1x93_tab[0x0c] & 0x3f) | val);
145 }
146 
147 static int ves1x93_set_fec(struct ves1x93_state *state, enum fe_code_rate fec)
148 {
149 	if (fec == FEC_AUTO)
150 		return ves1x93_writereg (state, 0x0d, 0x08);
151 	else if (fec < FEC_1_2 || fec > FEC_8_9)
152 		return -EINVAL;
153 	else
154 		return ves1x93_writereg (state, 0x0d, fec - FEC_1_2);
155 }
156 
157 static enum fe_code_rate ves1x93_get_fec(struct ves1x93_state *state)
158 {
159 	return FEC_1_2 + ((ves1x93_readreg (state, 0x0d) >> 4) & 0x7);
160 }
161 
162 static int ves1x93_set_symbolrate (struct ves1x93_state* state, u32 srate)
163 {
164 	u32 BDR;
165 	u32 ratio;
166 	u8  ADCONF, FCONF, FNR, AGCR;
167 	u32 BDRI;
168 	u32 tmp;
169 	u32 FIN;
170 
171 	dprintk("%s: srate == %d\n", __func__, (unsigned int) srate);
172 
173 	if (srate > state->config->xin/2)
174 		srate = state->config->xin/2;
175 
176 	if (srate < 500000)
177 		srate = 500000;
178 
179 #define MUL (1UL<<26)
180 
181 	FIN = (state->config->xin + 6000) >> 4;
182 
183 	tmp = srate << 6;
184 	ratio = tmp / FIN;
185 
186 	tmp = (tmp % FIN) << 8;
187 	ratio = (ratio << 8) + tmp / FIN;
188 
189 	tmp = (tmp % FIN) << 8;
190 	ratio = (ratio << 8) + tmp / FIN;
191 
192 	FNR = 0xff;
193 
194 	if (ratio < MUL/3)	     FNR = 0;
195 	if (ratio < (MUL*11)/50)     FNR = 1;
196 	if (ratio < MUL/6)	     FNR = 2;
197 	if (ratio < MUL/9)	     FNR = 3;
198 	if (ratio < MUL/12)	     FNR = 4;
199 	if (ratio < (MUL*11)/200)    FNR = 5;
200 	if (ratio < MUL/24)	     FNR = 6;
201 	if (ratio < (MUL*27)/1000)   FNR = 7;
202 	if (ratio < MUL/48)	     FNR = 8;
203 	if (ratio < (MUL*137)/10000) FNR = 9;
204 
205 	if (FNR == 0xff) {
206 		ADCONF = 0x89;
207 		FCONF  = 0x80;
208 		FNR	= 0;
209 	} else {
210 		ADCONF = 0x81;
211 		FCONF  = 0x88 | (FNR >> 1) | ((FNR & 0x01) << 5);
212 		/*FCONF	 = 0x80 | ((FNR & 0x01) << 5) | (((FNR > 1) & 0x03) << 3) | ((FNR >> 1) & 0x07);*/
213 	}
214 
215 	BDR = (( (ratio << (FNR >> 1)) >> 4) + 1) >> 1;
216 	BDRI = ( ((FIN << 8) / ((srate << (FNR >> 1)) >> 2)) + 1) >> 1;
217 
218 	dprintk("FNR= %d\n", FNR);
219 	dprintk("ratio= %08x\n", (unsigned int) ratio);
220 	dprintk("BDR= %08x\n", (unsigned int) BDR);
221 	dprintk("BDRI= %02x\n", (unsigned int) BDRI);
222 
223 	if (BDRI > 0xff)
224 		BDRI = 0xff;
225 
226 	ves1x93_writereg (state, 0x06, 0xff & BDR);
227 	ves1x93_writereg (state, 0x07, 0xff & (BDR >> 8));
228 	ves1x93_writereg (state, 0x08, 0x0f & (BDR >> 16));
229 
230 	ves1x93_writereg (state, 0x09, BDRI);
231 	ves1x93_writereg (state, 0x20, ADCONF);
232 	ves1x93_writereg (state, 0x21, FCONF);
233 
234 	AGCR = state->init_1x93_tab[0x05];
235 	if (state->config->invert_pwm)
236 		AGCR |= 0x20;
237 
238 	if (srate < 6000000)
239 		AGCR |= 0x80;
240 	else
241 		AGCR &= ~0x80;
242 
243 	ves1x93_writereg (state, 0x05, AGCR);
244 
245 	/* ves1993 hates this, will lose lock */
246 	if (state->demod_type != DEMOD_VES1993)
247 		ves1x93_clr_bit (state);
248 
249 	return 0;
250 }
251 
252 static int ves1x93_init (struct dvb_frontend* fe)
253 {
254 	struct ves1x93_state* state = fe->demodulator_priv;
255 	int i;
256 	int val;
257 
258 	dprintk("%s: init chip\n", __func__);
259 
260 	for (i = 0; i < state->tab_size; i++) {
261 		if (state->init_1x93_wtab[i]) {
262 			val = state->init_1x93_tab[i];
263 
264 			if (state->config->invert_pwm && (i == 0x05)) val |= 0x20; /* invert PWM */
265 			ves1x93_writereg (state, i, val);
266 		}
267 	}
268 
269 	return 0;
270 }
271 
272 static int ves1x93_set_voltage(struct dvb_frontend *fe,
273 			       enum fe_sec_voltage voltage)
274 {
275 	struct ves1x93_state* state = fe->demodulator_priv;
276 
277 	switch (voltage) {
278 	case SEC_VOLTAGE_13:
279 		return ves1x93_writereg (state, 0x1f, 0x20);
280 	case SEC_VOLTAGE_18:
281 		return ves1x93_writereg (state, 0x1f, 0x30);
282 	case SEC_VOLTAGE_OFF:
283 		return ves1x93_writereg (state, 0x1f, 0x00);
284 	default:
285 		return -EINVAL;
286 	}
287 }
288 
289 static int ves1x93_read_status(struct dvb_frontend *fe,
290 			       enum fe_status *status)
291 {
292 	struct ves1x93_state* state = fe->demodulator_priv;
293 
294 	u8 sync = ves1x93_readreg (state, 0x0e);
295 
296 	/*
297 	 * The ves1893 sometimes returns sync values that make no sense,
298 	 * because, e.g., the SIGNAL bit is 0, while some of the higher
299 	 * bits are 1 (and how can there be a CARRIER w/o a SIGNAL?).
300 	 * Tests showed that the VITERBI and SYNC bits are returned
301 	 * reliably, while the SIGNAL and CARRIER bits ar sometimes wrong.
302 	 * If such a case occurs, we read the value again, until we get a
303 	 * valid value.
304 	 */
305 	int maxtry = 10; /* just for safety - let's not get stuck here */
306 	while ((sync & 0x03) != 0x03 && (sync & 0x0c) && maxtry--) {
307 		msleep(10);
308 		sync = ves1x93_readreg (state, 0x0e);
309 	}
310 
311 	*status = 0;
312 
313 	if (sync & 1)
314 		*status |= FE_HAS_SIGNAL;
315 
316 	if (sync & 2)
317 		*status |= FE_HAS_CARRIER;
318 
319 	if (sync & 4)
320 		*status |= FE_HAS_VITERBI;
321 
322 	if (sync & 8)
323 		*status |= FE_HAS_SYNC;
324 
325 	if ((sync & 0x1f) == 0x1f)
326 		*status |= FE_HAS_LOCK;
327 
328 	return 0;
329 }
330 
331 static int ves1x93_read_ber(struct dvb_frontend* fe, u32* ber)
332 {
333 	struct ves1x93_state* state = fe->demodulator_priv;
334 
335 	*ber = ves1x93_readreg (state, 0x15);
336 	*ber |= (ves1x93_readreg (state, 0x16) << 8);
337 	*ber |= ((ves1x93_readreg (state, 0x17) & 0x0F) << 16);
338 	*ber *= 10;
339 
340 	return 0;
341 }
342 
343 static int ves1x93_read_signal_strength(struct dvb_frontend* fe, u16* strength)
344 {
345 	struct ves1x93_state* state = fe->demodulator_priv;
346 
347 	u8 signal = ~ves1x93_readreg (state, 0x0b);
348 	*strength = (signal << 8) | signal;
349 
350 	return 0;
351 }
352 
353 static int ves1x93_read_snr(struct dvb_frontend* fe, u16* snr)
354 {
355 	struct ves1x93_state* state = fe->demodulator_priv;
356 
357 	u8 _snr = ~ves1x93_readreg (state, 0x1c);
358 	*snr = (_snr << 8) | _snr;
359 
360 	return 0;
361 }
362 
363 static int ves1x93_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
364 {
365 	struct ves1x93_state* state = fe->demodulator_priv;
366 
367 	*ucblocks = ves1x93_readreg (state, 0x18) & 0x7f;
368 
369 	if (*ucblocks == 0x7f)
370 		*ucblocks = 0xffffffff;   /* counter overflow... */
371 
372 	ves1x93_writereg (state, 0x18, 0x00);  /* reset the counter */
373 	ves1x93_writereg (state, 0x18, 0x80);  /* dto. */
374 
375 	return 0;
376 }
377 
378 static int ves1x93_set_frontend(struct dvb_frontend *fe)
379 {
380 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
381 	struct ves1x93_state* state = fe->demodulator_priv;
382 
383 	if (fe->ops.tuner_ops.set_params) {
384 		fe->ops.tuner_ops.set_params(fe);
385 		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
386 	}
387 	ves1x93_set_inversion (state, p->inversion);
388 	ves1x93_set_fec(state, p->fec_inner);
389 	ves1x93_set_symbolrate(state, p->symbol_rate);
390 	state->inversion = p->inversion;
391 	state->frequency = p->frequency;
392 
393 	return 0;
394 }
395 
396 static int ves1x93_get_frontend(struct dvb_frontend *fe,
397 				struct dtv_frontend_properties *p)
398 {
399 	struct ves1x93_state* state = fe->demodulator_priv;
400 	int afc;
401 
402 	afc = ((int)((char)(ves1x93_readreg (state, 0x0a) << 1)))/2;
403 	afc = (afc * (int)(p->symbol_rate/1000/8))/16;
404 
405 	p->frequency = state->frequency - afc;
406 
407 	/*
408 	 * inversion indicator is only valid
409 	 * if auto inversion was used
410 	 */
411 	if (state->inversion == INVERSION_AUTO)
412 		p->inversion = (ves1x93_readreg (state, 0x0f) & 2) ?
413 				INVERSION_OFF : INVERSION_ON;
414 	p->fec_inner = ves1x93_get_fec(state);
415 	/*  XXX FIXME: timing offset !! */
416 
417 	return 0;
418 }
419 
420 static int ves1x93_sleep(struct dvb_frontend* fe)
421 {
422 	struct ves1x93_state* state = fe->demodulator_priv;
423 
424 	return ves1x93_writereg (state, 0x00, 0x08);
425 }
426 
427 static void ves1x93_release(struct dvb_frontend* fe)
428 {
429 	struct ves1x93_state* state = fe->demodulator_priv;
430 	kfree(state);
431 }
432 
433 static int ves1x93_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
434 {
435 	struct ves1x93_state* state = fe->demodulator_priv;
436 
437 	if (enable) {
438 		return ves1x93_writereg(state, 0x00, 0x11);
439 	} else {
440 		return ves1x93_writereg(state, 0x00, 0x01);
441 	}
442 }
443 
444 static const struct dvb_frontend_ops ves1x93_ops;
445 
446 struct dvb_frontend* ves1x93_attach(const struct ves1x93_config* config,
447 				    struct i2c_adapter* i2c)
448 {
449 	struct ves1x93_state* state = NULL;
450 	u8 identity;
451 
452 	/* allocate memory for the internal state */
453 	state = kzalloc(sizeof(struct ves1x93_state), GFP_KERNEL);
454 	if (state == NULL) goto error;
455 
456 	/* setup the state */
457 	state->config = config;
458 	state->i2c = i2c;
459 	state->inversion = INVERSION_OFF;
460 
461 	/* check if the demod is there + identify it */
462 	identity = ves1x93_readreg(state, 0x1e);
463 	switch (identity) {
464 	case 0xdc: /* VES1893A rev1 */
465 		printk("ves1x93: Detected ves1893a rev1\n");
466 		state->demod_type = DEMOD_VES1893;
467 		state->init_1x93_tab = init_1893_tab;
468 		state->init_1x93_wtab = init_1893_wtab;
469 		state->tab_size = sizeof(init_1893_tab);
470 		break;
471 
472 	case 0xdd: /* VES1893A rev2 */
473 		printk("ves1x93: Detected ves1893a rev2\n");
474 		state->demod_type = DEMOD_VES1893;
475 		state->init_1x93_tab = init_1893_tab;
476 		state->init_1x93_wtab = init_1893_wtab;
477 		state->tab_size = sizeof(init_1893_tab);
478 		break;
479 
480 	case 0xde: /* VES1993 */
481 		printk("ves1x93: Detected ves1993\n");
482 		state->demod_type = DEMOD_VES1993;
483 		state->init_1x93_tab = init_1993_tab;
484 		state->init_1x93_wtab = init_1993_wtab;
485 		state->tab_size = sizeof(init_1993_tab);
486 		break;
487 
488 	default:
489 		goto error;
490 	}
491 
492 	/* create dvb_frontend */
493 	memcpy(&state->frontend.ops, &ves1x93_ops, sizeof(struct dvb_frontend_ops));
494 	state->frontend.demodulator_priv = state;
495 	return &state->frontend;
496 
497 error:
498 	kfree(state);
499 	return NULL;
500 }
501 
502 static const struct dvb_frontend_ops ves1x93_ops = {
503 	.delsys = { SYS_DVBS },
504 	.info = {
505 		.name			= "VLSI VES1x93 DVB-S",
506 		.frequency_min_hz	=   950 * MHz,
507 		.frequency_max_hz	=  2150 * MHz,
508 		.frequency_stepsize_hz	=   125 * kHz,
509 		.frequency_tolerance_hz	= 29500 * kHz,
510 		.symbol_rate_min	= 1000000,
511 		.symbol_rate_max	= 45000000,
512 	/*	.symbol_rate_tolerance	=	???,*/
513 		.caps = FE_CAN_INVERSION_AUTO |
514 			FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
515 			FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
516 			FE_CAN_QPSK
517 	},
518 
519 	.release = ves1x93_release,
520 
521 	.init = ves1x93_init,
522 	.sleep = ves1x93_sleep,
523 	.i2c_gate_ctrl = ves1x93_i2c_gate_ctrl,
524 
525 	.set_frontend = ves1x93_set_frontend,
526 	.get_frontend = ves1x93_get_frontend,
527 
528 	.read_status = ves1x93_read_status,
529 	.read_ber = ves1x93_read_ber,
530 	.read_signal_strength = ves1x93_read_signal_strength,
531 	.read_snr = ves1x93_read_snr,
532 	.read_ucblocks = ves1x93_read_ucblocks,
533 
534 	.set_voltage = ves1x93_set_voltage,
535 };
536 
537 module_param(debug, int, 0644);
538 
539 MODULE_DESCRIPTION("VLSI VES1x93 DVB-S Demodulator driver");
540 MODULE_AUTHOR("Ralph Metzler");
541 MODULE_LICENSE("GPL");
542 
543 EXPORT_SYMBOL(ves1x93_attach);
544