1 /*
2 Driver for VES1893 and VES1993 QPSK Demodulators
3
4 Copyright (C) 1999 Convergence Integrated Media GmbH <ralph@convergence.de>
5 Copyright (C) 2001 Ronny Strutz <3des@elitedvb.de>
6 Copyright (C) 2002 Dennis Noermann <dennis.noermann@noernet.de>
7 Copyright (C) 2002-2003 Andreas Oberritter <obi@linuxtv.org>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/string.h>
30 #include <linux/slab.h>
31 #include <linux/delay.h>
32
33 #include "dvb_frontend.h"
34 #include "ves1x93.h"
35
36
37 struct ves1x93_state {
38 struct i2c_adapter* i2c;
39 /* configuration settings */
40 const struct ves1x93_config* config;
41 struct dvb_frontend frontend;
42
43 /* previous uncorrected block counter */
44 fe_spectral_inversion_t inversion;
45 u8 *init_1x93_tab;
46 u8 *init_1x93_wtab;
47 u8 tab_size;
48 u8 demod_type;
49 };
50
51 static int debug;
52 #define dprintk if (debug) printk
53
54 #define DEMOD_VES1893 0
55 #define DEMOD_VES1993 1
56
57 static u8 init_1893_tab [] = {
58 0x01, 0xa4, 0x35, 0x80, 0x2a, 0x0b, 0x55, 0xc4,
59 0x09, 0x69, 0x00, 0x86, 0x4c, 0x28, 0x7f, 0x00,
60 0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
61 0x80, 0x00, 0x21, 0xb0, 0x14, 0x00, 0xdc, 0x00,
62 0x81, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
63 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
64 0x00, 0x55, 0x00, 0x00, 0x7f, 0x00
65 };
66
67 static u8 init_1993_tab [] = {
68 0x00, 0x9c, 0x35, 0x80, 0x6a, 0x09, 0x72, 0x8c,
69 0x09, 0x6b, 0x00, 0x00, 0x4c, 0x08, 0x00, 0x00,
70 0x00, 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
71 0x80, 0x40, 0x21, 0xb0, 0x00, 0x00, 0x00, 0x10,
72 0x81, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
73 0x00, 0x00, 0x80, 0x80, 0x00, 0x00, 0x00, 0x00,
74 0x00, 0x55, 0x03, 0x00, 0x00, 0x00, 0x00, 0x03,
75 0x00, 0x00, 0x0e, 0x80, 0x00
76 };
77
78 static u8 init_1893_wtab[] =
79 {
80 1,1,1,1,1,1,1,1, 1,1,0,0,1,1,0,0,
81 0,1,0,0,0,0,0,0, 1,0,1,1,0,0,0,1,
82 1,1,1,0,0,0,0,0, 0,0,1,1,0,0,0,0,
83 1,1,1,0,1,1
84 };
85
86 static u8 init_1993_wtab[] =
87 {
88 1,1,1,1,1,1,1,1, 1,1,0,0,1,1,0,0,
89 0,1,0,0,0,0,0,0, 1,1,1,1,0,0,0,1,
90 1,1,1,0,0,0,0,0, 0,0,1,1,0,0,0,0,
91 1,1,1,0,1,1,1,1, 1,1,1,1,1
92 };
93
94 static int ves1x93_writereg (struct ves1x93_state* state, u8 reg, u8 data)
95 {
96 u8 buf [] = { 0x00, reg, data };
97 struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 3 };
98 int err;
99
100 if ((err = i2c_transfer (state->i2c, &msg, 1)) != 1) {
101 dprintk ("%s: writereg error (err == %i, reg == 0x%02x, data == 0x%02x)\n", __func__, err, reg, data);
102 return -EREMOTEIO;
103 }
104
105 return 0;
106 }
107
108 static u8 ves1x93_readreg (struct ves1x93_state* state, u8 reg)
109 {
110 int ret;
111 u8 b0 [] = { 0x00, reg };
112 u8 b1 [] = { 0 };
113 struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 2 },
114 { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
115
116 ret = i2c_transfer (state->i2c, msg, 2);
117
118 if (ret != 2) return ret;
119
120 return b1[0];
121 }
122
123 static int ves1x93_clr_bit (struct ves1x93_state* state)
124 {
125 msleep(10);
126 ves1x93_writereg (state, 0, state->init_1x93_tab[0] & 0xfe);
127 ves1x93_writereg (state, 0, state->init_1x93_tab[0]);
128 msleep(50);
129 return 0;
130 }
131
132 static int ves1x93_set_inversion (struct ves1x93_state* state, fe_spectral_inversion_t inversion)
133 {
134 u8 val;
135
136 /*
137 * inversion on/off are interchanged because i and q seem to
138 * be swapped on the hardware
139 */
140
141 switch (inversion) {
142 case INVERSION_OFF:
143 val = 0xc0;
144 break;
145 case INVERSION_ON:
146 val = 0x80;
147 break;
148 case INVERSION_AUTO:
149 val = 0x00;
150 break;
151 default:
152 return -EINVAL;
153 }
154
155 return ves1x93_writereg (state, 0x0c, (state->init_1x93_tab[0x0c] & 0x3f) | val);
156 }
157
158 static int ves1x93_set_fec (struct ves1x93_state* state, fe_code_rate_t fec)
159 {
160 if (fec == FEC_AUTO)
161 return ves1x93_writereg (state, 0x0d, 0x08);
162 else if (fec < FEC_1_2 || fec > FEC_8_9)
163 return -EINVAL;
164 else
165 return ves1x93_writereg (state, 0x0d, fec - FEC_1_2);
166 }
167
168 static fe_code_rate_t ves1x93_get_fec (struct ves1x93_state* state)
169 {
170 return FEC_1_2 + ((ves1x93_readreg (state, 0x0d) >> 4) & 0x7);
171 }
172
173 static int ves1x93_set_symbolrate (struct ves1x93_state* state, u32 srate)
174 {
175 u32 BDR;
176 u32 ratio;
177 u8 ADCONF, FCONF, FNR, AGCR;
178 u32 BDRI;
179 u32 tmp;
180 u32 FIN;
181
182 dprintk("%s: srate == %d\n", __func__, (unsigned int) srate);
183
184 if (srate > state->config->xin/2)
185 srate = state->config->xin/2;
186
187 if (srate < 500000)
188 srate = 500000;
189
190 #define MUL (1UL<<26)
191
192 FIN = (state->config->xin + 6000) >> 4;
193
194 tmp = srate << 6;
195 ratio = tmp / FIN;
196
197 tmp = (tmp % FIN) << 8;
198 ratio = (ratio << 8) + tmp / FIN;
199
200 tmp = (tmp % FIN) << 8;
201 ratio = (ratio << 8) + tmp / FIN;
202
203 FNR = 0xff;
204
205 if (ratio < MUL/3) FNR = 0;
206 if (ratio < (MUL*11)/50) FNR = 1;
207 if (ratio < MUL/6) FNR = 2;
208 if (ratio < MUL/9) FNR = 3;
209 if (ratio < MUL/12) FNR = 4;
210 if (ratio < (MUL*11)/200) FNR = 5;
211 if (ratio < MUL/24) FNR = 6;
212 if (ratio < (MUL*27)/1000) FNR = 7;
213 if (ratio < MUL/48) FNR = 8;
214 if (ratio < (MUL*137)/10000) FNR = 9;
215
216 if (FNR == 0xff) {
217 ADCONF = 0x89;
218 FCONF = 0x80;
219 FNR = 0;
220 } else {
221 ADCONF = 0x81;
222 FCONF = 0x88 | (FNR >> 1) | ((FNR & 0x01) << 5);
223 /*FCONF = 0x80 | ((FNR & 0x01) << 5) | (((FNR > 1) & 0x03) << 3) | ((FNR >> 1) & 0x07);*/
224 }
225
226 BDR = (( (ratio << (FNR >> 1)) >> 4) + 1) >> 1;
227 BDRI = ( ((FIN << 8) / ((srate << (FNR >> 1)) >> 2)) + 1) >> 1;
228
229 dprintk("FNR= %d\n", FNR);
230 dprintk("ratio= %08x\n", (unsigned int) ratio);
231 dprintk("BDR= %08x\n", (unsigned int) BDR);
232 dprintk("BDRI= %02x\n", (unsigned int) BDRI);
233
234 if (BDRI > 0xff)
235 BDRI = 0xff;
236
237 ves1x93_writereg (state, 0x06, 0xff & BDR);
238 ves1x93_writereg (state, 0x07, 0xff & (BDR >> 8));
239 ves1x93_writereg (state, 0x08, 0x0f & (BDR >> 16));
240
241 ves1x93_writereg (state, 0x09, BDRI);
242 ves1x93_writereg (state, 0x20, ADCONF);
243 ves1x93_writereg (state, 0x21, FCONF);
244
245 AGCR = state->init_1x93_tab[0x05];
246 if (state->config->invert_pwm)
247 AGCR |= 0x20;
248
249 if (srate < 6000000)
250 AGCR |= 0x80;
251 else
252 AGCR &= ~0x80;
253
254 ves1x93_writereg (state, 0x05, AGCR);
255
256 /* ves1993 hates this, will lose lock */
257 if (state->demod_type != DEMOD_VES1993)
258 ves1x93_clr_bit (state);
259
260 return 0;
261 }
262
263 static int ves1x93_init (struct dvb_frontend* fe)
264 {
265 struct ves1x93_state* state = fe->demodulator_priv;
266 int i;
267 int val;
268
269 dprintk("%s: init chip\n", __func__);
270
271 for (i = 0; i < state->tab_size; i++) {
272 if (state->init_1x93_wtab[i]) {
273 val = state->init_1x93_tab[i];
274
275 if (state->config->invert_pwm && (i == 0x05)) val |= 0x20; /* invert PWM */
276 ves1x93_writereg (state, i, val);
277 }
278 }
279
280 return 0;
281 }
282
283 static int ves1x93_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
284 {
285 struct ves1x93_state* state = fe->demodulator_priv;
286
287 switch (voltage) {
288 case SEC_VOLTAGE_13:
289 return ves1x93_writereg (state, 0x1f, 0x20);
290 case SEC_VOLTAGE_18:
291 return ves1x93_writereg (state, 0x1f, 0x30);
292 case SEC_VOLTAGE_OFF:
293 return ves1x93_writereg (state, 0x1f, 0x00);
294 default:
295 return -EINVAL;
296 }
297 }
298
299 static int ves1x93_read_status(struct dvb_frontend* fe, fe_status_t* status)
300 {
301 struct ves1x93_state* state = fe->demodulator_priv;
302
303 u8 sync = ves1x93_readreg (state, 0x0e);
304
305 /*
306 * The ves1893 sometimes returns sync values that make no sense,
307 * because, e.g., the SIGNAL bit is 0, while some of the higher
308 * bits are 1 (and how can there be a CARRIER w/o a SIGNAL?).
309 * Tests showed that the VITERBI and SYNC bits are returned
310 * reliably, while the SIGNAL and CARRIER bits ar sometimes wrong.
311 * If such a case occurs, we read the value again, until we get a
312 * valid value.
313 */
314 int maxtry = 10; /* just for safety - let's not get stuck here */
315 while ((sync & 0x03) != 0x03 && (sync & 0x0c) && maxtry--) {
316 msleep(10);
317 sync = ves1x93_readreg (state, 0x0e);
318 }
319
320 *status = 0;
321
322 if (sync & 1)
323 *status |= FE_HAS_SIGNAL;
324
325 if (sync & 2)
326 *status |= FE_HAS_CARRIER;
327
328 if (sync & 4)
329 *status |= FE_HAS_VITERBI;
330
331 if (sync & 8)
332 *status |= FE_HAS_SYNC;
333
334 if ((sync & 0x1f) == 0x1f)
335 *status |= FE_HAS_LOCK;
336
337 return 0;
338 }
339
340 static int ves1x93_read_ber(struct dvb_frontend* fe, u32* ber)
341 {
342 struct ves1x93_state* state = fe->demodulator_priv;
343
344 *ber = ves1x93_readreg (state, 0x15);
345 *ber |= (ves1x93_readreg (state, 0x16) << 8);
346 *ber |= ((ves1x93_readreg (state, 0x17) & 0x0F) << 16);
347 *ber *= 10;
348
349 return 0;
350 }
351
352 static int ves1x93_read_signal_strength(struct dvb_frontend* fe, u16* strength)
353 {
354 struct ves1x93_state* state = fe->demodulator_priv;
355
356 u8 signal = ~ves1x93_readreg (state, 0x0b);
357 *strength = (signal << 8) | signal;
358
359 return 0;
360 }
361
362 static int ves1x93_read_snr(struct dvb_frontend* fe, u16* snr)
363 {
364 struct ves1x93_state* state = fe->demodulator_priv;
365
366 u8 _snr = ~ves1x93_readreg (state, 0x1c);
367 *snr = (_snr << 8) | _snr;
368
369 return 0;
370 }
371
372 static int ves1x93_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
373 {
374 struct ves1x93_state* state = fe->demodulator_priv;
375
376 *ucblocks = ves1x93_readreg (state, 0x18) & 0x7f;
377
378 if (*ucblocks == 0x7f)
379 *ucblocks = 0xffffffff; /* counter overflow... */
380
381 ves1x93_writereg (state, 0x18, 0x00); /* reset the counter */
382 ves1x93_writereg (state, 0x18, 0x80); /* dto. */
383
384 return 0;
385 }
386
387 static int ves1x93_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
388 {
389 struct ves1x93_state* state = fe->demodulator_priv;
390
391 if (fe->ops.tuner_ops.set_params) {
392 fe->ops.tuner_ops.set_params(fe, p);
393 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
394 }
395 ves1x93_set_inversion (state, p->inversion);
396 ves1x93_set_fec (state, p->u.qpsk.fec_inner);
397 ves1x93_set_symbolrate (state, p->u.qpsk.symbol_rate);
398 state->inversion = p->inversion;
399
400 return 0;
401 }
402
403 static int ves1x93_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
404 {
405 struct ves1x93_state* state = fe->demodulator_priv;
406 int afc;
407
408 afc = ((int)((char)(ves1x93_readreg (state, 0x0a) << 1)))/2;
409 afc = (afc * (int)(p->u.qpsk.symbol_rate/1000/8))/16;
410
411 p->frequency -= afc;
412
413 /*
414 * inversion indicator is only valid
415 * if auto inversion was used
416 */
417 if (state->inversion == INVERSION_AUTO)
418 p->inversion = (ves1x93_readreg (state, 0x0f) & 2) ?
419 INVERSION_OFF : INVERSION_ON;
420 p->u.qpsk.fec_inner = ves1x93_get_fec (state);
421 /* XXX FIXME: timing offset !! */
422
423 return 0;
424 }
425
426 static int ves1x93_sleep(struct dvb_frontend* fe)
427 {
428 struct ves1x93_state* state = fe->demodulator_priv;
429
430 return ves1x93_writereg (state, 0x00, 0x08);
431 }
432
433 static void ves1x93_release(struct dvb_frontend* fe)
434 {
435 struct ves1x93_state* state = fe->demodulator_priv;
436 kfree(state);
437 }
438
439 static int ves1x93_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
440 {
441 struct ves1x93_state* state = fe->demodulator_priv;
442
443 if (enable) {
444 return ves1x93_writereg(state, 0x00, 0x11);
445 } else {
446 return ves1x93_writereg(state, 0x00, 0x01);
447 }
448 }
449
450 static struct dvb_frontend_ops ves1x93_ops;
451
452 struct dvb_frontend* ves1x93_attach(const struct ves1x93_config* config,
453 struct i2c_adapter* i2c)
454 {
455 struct ves1x93_state* state = NULL;
456 u8 identity;
457
458 /* allocate memory for the internal state */
459 state = kzalloc(sizeof(struct ves1x93_state), GFP_KERNEL);
460 if (state == NULL) goto error;
461
462 /* setup the state */
463 state->config = config;
464 state->i2c = i2c;
465 state->inversion = INVERSION_OFF;
466
467 /* check if the demod is there + identify it */
468 identity = ves1x93_readreg(state, 0x1e);
469 switch (identity) {
470 case 0xdc: /* VES1893A rev1 */
471 printk("ves1x93: Detected ves1893a rev1\n");
472 state->demod_type = DEMOD_VES1893;
473 state->init_1x93_tab = init_1893_tab;
474 state->init_1x93_wtab = init_1893_wtab;
475 state->tab_size = sizeof(init_1893_tab);
476 break;
477
478 case 0xdd: /* VES1893A rev2 */
479 printk("ves1x93: Detected ves1893a rev2\n");
480 state->demod_type = DEMOD_VES1893;
481 state->init_1x93_tab = init_1893_tab;
482 state->init_1x93_wtab = init_1893_wtab;
483 state->tab_size = sizeof(init_1893_tab);
484 break;
485
486 case 0xde: /* VES1993 */
487 printk("ves1x93: Detected ves1993\n");
488 state->demod_type = DEMOD_VES1993;
489 state->init_1x93_tab = init_1993_tab;
490 state->init_1x93_wtab = init_1993_wtab;
491 state->tab_size = sizeof(init_1993_tab);
492 break;
493
494 default:
495 goto error;
496 }
497
498 /* create dvb_frontend */
499 memcpy(&state->frontend.ops, &ves1x93_ops, sizeof(struct dvb_frontend_ops));
500 state->frontend.demodulator_priv = state;
501 return &state->frontend;
502
503 error:
504 kfree(state);
505 return NULL;
506 }
507
508 static struct dvb_frontend_ops ves1x93_ops = {
509
510 .info = {
511 .name = "VLSI VES1x93 DVB-S",
512 .type = FE_QPSK,
513 .frequency_min = 950000,
514 .frequency_max = 2150000,
515 .frequency_stepsize = 125, /* kHz for QPSK frontends */
516 .frequency_tolerance = 29500,
517 .symbol_rate_min = 1000000,
518 .symbol_rate_max = 45000000,
519 /* .symbol_rate_tolerance = ???,*/
520 .caps = FE_CAN_INVERSION_AUTO |
521 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
522 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
523 FE_CAN_QPSK
524 },
525
526 .release = ves1x93_release,
527
528 .init = ves1x93_init,
529 .sleep = ves1x93_sleep,
530 .i2c_gate_ctrl = ves1x93_i2c_gate_ctrl,
531
532 .set_frontend = ves1x93_set_frontend,
533 .get_frontend = ves1x93_get_frontend,
534
535 .read_status = ves1x93_read_status,
536 .read_ber = ves1x93_read_ber,
537 .read_signal_strength = ves1x93_read_signal_strength,
538 .read_snr = ves1x93_read_snr,
539 .read_ucblocks = ves1x93_read_ucblocks,
540
541 .set_voltage = ves1x93_set_voltage,
542 };
543
544 module_param(debug, int, 0644);
545
546 MODULE_DESCRIPTION("VLSI VES1x93 DVB-S Demodulator driver");
547 MODULE_AUTHOR("Ralph Metzler");
548 MODULE_LICENSE("GPL");
549
550 EXPORT_SYMBOL(ves1x93_attach);
551
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