1 /*
2 * Support for LGDT3302 and LGDT3303 - VSB/QAM
3 *
4 * Copyright (C) 2005 Wilson Michaels <wilsonmichaels@earthlink.net>
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 /*
23 * NOTES ABOUT THIS DRIVER
24 *
25 * This Linux driver supports:
26 * DViCO FusionHDTV 3 Gold-Q
27 * DViCO FusionHDTV 3 Gold-T
28 * DViCO FusionHDTV 5 Gold
29 * DViCO FusionHDTV 5 Lite
30 * DViCO FusionHDTV 5 USB Gold
31 * Air2PC/AirStar 2 ATSC 3rd generation (HD5000)
32 * pcHDTV HD5500
33 *
34 */
35
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/delay.h>
40 #include <linux/string.h>
41 #include <linux/slab.h>
42 #include <asm/byteorder.h>
43
44 #include "dvb_frontend.h"
45 #include "dvb_math.h"
46 #include "lgdt330x_priv.h"
47 #include "lgdt330x.h"
48
49 /* Use Equalizer Mean Squared Error instead of Phaser Tracker MSE */
50 /* #define USE_EQMSE */
51
52 static int debug;
53 module_param(debug, int, 0644);
54 MODULE_PARM_DESC(debug,"Turn on/off lgdt330x frontend debugging (default:off).");
55 #define dprintk(args...) \
56 do { \
57 if (debug) printk(KERN_DEBUG "lgdt330x: " args); \
58 } while (0)
59
60 struct lgdt330x_state
61 {
62 struct i2c_adapter* i2c;
63
64 /* Configuration settings */
65 const struct lgdt330x_config* config;
66
67 struct dvb_frontend frontend;
68
69 /* Demodulator private data */
70 fe_modulation_t current_modulation;
71 u32 snr; /* Result of last SNR calculation */
72
73 /* Tuner private data */
74 u32 current_frequency;
75 };
76
i2c_write_demod_bytes(struct lgdt330x_state * state,u8 * buf,int len)77 static int i2c_write_demod_bytes (struct lgdt330x_state* state,
78 u8 *buf, /* data bytes to send */
79 int len /* number of bytes to send */ )
80 {
81 struct i2c_msg msg =
82 { .addr = state->config->demod_address,
83 .flags = 0,
84 .buf = buf,
85 .len = 2 };
86 int i;
87 int err;
88
89 for (i=0; i<len-1; i+=2){
90 if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1) {
91 printk(KERN_WARNING "lgdt330x: %s error (addr %02x <- %02x, err = %i)\n", __func__, msg.buf[0], msg.buf[1], err);
92 if (err < 0)
93 return err;
94 else
95 return -EREMOTEIO;
96 }
97 msg.buf += 2;
98 }
99 return 0;
100 }
101
102 /*
103 * This routine writes the register (reg) to the demod bus
104 * then reads the data returned for (len) bytes.
105 */
106
i2c_read_demod_bytes(struct lgdt330x_state * state,enum I2C_REG reg,u8 * buf,int len)107 static int i2c_read_demod_bytes(struct lgdt330x_state *state,
108 enum I2C_REG reg, u8 *buf, int len)
109 {
110 u8 wr [] = { reg };
111 struct i2c_msg msg [] = {
112 { .addr = state->config->demod_address,
113 .flags = 0, .buf = wr, .len = 1 },
114 { .addr = state->config->demod_address,
115 .flags = I2C_M_RD, .buf = buf, .len = len },
116 };
117 int ret;
118 ret = i2c_transfer(state->i2c, msg, 2);
119 if (ret != 2) {
120 printk(KERN_WARNING "lgdt330x: %s: addr 0x%02x select 0x%02x error (ret == %i)\n", __func__, state->config->demod_address, reg, ret);
121 if (ret >= 0)
122 ret = -EIO;
123 } else {
124 ret = 0;
125 }
126 return ret;
127 }
128
129 /* Software reset */
lgdt3302_SwReset(struct lgdt330x_state * state)130 static int lgdt3302_SwReset(struct lgdt330x_state* state)
131 {
132 u8 ret;
133 u8 reset[] = {
134 IRQ_MASK,
135 0x00 /* bit 6 is active low software reset
136 * bits 5-0 are 1 to mask interrupts */
137 };
138
139 ret = i2c_write_demod_bytes(state,
140 reset, sizeof(reset));
141 if (ret == 0) {
142
143 /* force reset high (inactive) and unmask interrupts */
144 reset[1] = 0x7f;
145 ret = i2c_write_demod_bytes(state,
146 reset, sizeof(reset));
147 }
148 return ret;
149 }
150
lgdt3303_SwReset(struct lgdt330x_state * state)151 static int lgdt3303_SwReset(struct lgdt330x_state* state)
152 {
153 u8 ret;
154 u8 reset[] = {
155 0x02,
156 0x00 /* bit 0 is active low software reset */
157 };
158
159 ret = i2c_write_demod_bytes(state,
160 reset, sizeof(reset));
161 if (ret == 0) {
162
163 /* force reset high (inactive) */
164 reset[1] = 0x01;
165 ret = i2c_write_demod_bytes(state,
166 reset, sizeof(reset));
167 }
168 return ret;
169 }
170
lgdt330x_SwReset(struct lgdt330x_state * state)171 static int lgdt330x_SwReset(struct lgdt330x_state* state)
172 {
173 switch (state->config->demod_chip) {
174 case LGDT3302:
175 return lgdt3302_SwReset(state);
176 case LGDT3303:
177 return lgdt3303_SwReset(state);
178 default:
179 return -ENODEV;
180 }
181 }
182
lgdt330x_init(struct dvb_frontend * fe)183 static int lgdt330x_init(struct dvb_frontend* fe)
184 {
185 /* Hardware reset is done using gpio[0] of cx23880x chip.
186 * I'd like to do it here, but don't know how to find chip address.
187 * cx88-cards.c arranges for the reset bit to be inactive (high).
188 * Maybe there needs to be a callable function in cx88-core or
189 * the caller of this function needs to do it. */
190
191 /*
192 * Array of byte pairs <address, value>
193 * to initialize each different chip
194 */
195 static u8 lgdt3302_init_data[] = {
196 /* Use 50MHz parameter values from spec sheet since xtal is 50 */
197 /* Change the value of NCOCTFV[25:0] of carrier
198 recovery center frequency register */
199 VSB_CARRIER_FREQ0, 0x00,
200 VSB_CARRIER_FREQ1, 0x87,
201 VSB_CARRIER_FREQ2, 0x8e,
202 VSB_CARRIER_FREQ3, 0x01,
203 /* Change the TPCLK pin polarity
204 data is valid on falling clock */
205 DEMUX_CONTROL, 0xfb,
206 /* Change the value of IFBW[11:0] of
207 AGC IF/RF loop filter bandwidth register */
208 AGC_RF_BANDWIDTH0, 0x40,
209 AGC_RF_BANDWIDTH1, 0x93,
210 AGC_RF_BANDWIDTH2, 0x00,
211 /* Change the value of bit 6, 'nINAGCBY' and
212 'NSSEL[1:0] of ACG function control register 2 */
213 AGC_FUNC_CTRL2, 0xc6,
214 /* Change the value of bit 6 'RFFIX'
215 of AGC function control register 3 */
216 AGC_FUNC_CTRL3, 0x40,
217 /* Set the value of 'INLVTHD' register 0x2a/0x2c
218 to 0x7fe */
219 AGC_DELAY0, 0x07,
220 AGC_DELAY2, 0xfe,
221 /* Change the value of IAGCBW[15:8]
222 of inner AGC loop filter bandwidth */
223 AGC_LOOP_BANDWIDTH0, 0x08,
224 AGC_LOOP_BANDWIDTH1, 0x9a
225 };
226
227 static u8 lgdt3303_init_data[] = {
228 0x4c, 0x14
229 };
230
231 static u8 flip_1_lgdt3303_init_data[] = {
232 0x4c, 0x14,
233 0x87, 0xf3
234 };
235
236 static u8 flip_2_lgdt3303_init_data[] = {
237 0x4c, 0x14,
238 0x87, 0xda
239 };
240
241 struct lgdt330x_state* state = fe->demodulator_priv;
242 char *chip_name;
243 int err;
244
245 switch (state->config->demod_chip) {
246 case LGDT3302:
247 chip_name = "LGDT3302";
248 err = i2c_write_demod_bytes(state, lgdt3302_init_data,
249 sizeof(lgdt3302_init_data));
250 break;
251 case LGDT3303:
252 chip_name = "LGDT3303";
253 switch (state->config->clock_polarity_flip) {
254 case 2:
255 err = i2c_write_demod_bytes(state,
256 flip_2_lgdt3303_init_data,
257 sizeof(flip_2_lgdt3303_init_data));
258 break;
259 case 1:
260 err = i2c_write_demod_bytes(state,
261 flip_1_lgdt3303_init_data,
262 sizeof(flip_1_lgdt3303_init_data));
263 break;
264 case 0:
265 default:
266 err = i2c_write_demod_bytes(state, lgdt3303_init_data,
267 sizeof(lgdt3303_init_data));
268 }
269 break;
270 default:
271 chip_name = "undefined";
272 printk (KERN_WARNING "Only LGDT3302 and LGDT3303 are supported chips.\n");
273 err = -ENODEV;
274 }
275 dprintk("%s entered as %s\n", __func__, chip_name);
276 if (err < 0)
277 return err;
278 return lgdt330x_SwReset(state);
279 }
280
lgdt330x_read_ber(struct dvb_frontend * fe,u32 * ber)281 static int lgdt330x_read_ber(struct dvb_frontend* fe, u32* ber)
282 {
283 *ber = 0; /* Not supplied by the demod chips */
284 return 0;
285 }
286
lgdt330x_read_ucblocks(struct dvb_frontend * fe,u32 * ucblocks)287 static int lgdt330x_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
288 {
289 struct lgdt330x_state* state = fe->demodulator_priv;
290 int err;
291 u8 buf[2];
292
293 *ucblocks = 0;
294
295 switch (state->config->demod_chip) {
296 case LGDT3302:
297 err = i2c_read_demod_bytes(state, LGDT3302_PACKET_ERR_COUNTER1,
298 buf, sizeof(buf));
299 break;
300 case LGDT3303:
301 err = i2c_read_demod_bytes(state, LGDT3303_PACKET_ERR_COUNTER1,
302 buf, sizeof(buf));
303 break;
304 default:
305 printk(KERN_WARNING
306 "Only LGDT3302 and LGDT3303 are supported chips.\n");
307 err = -ENODEV;
308 }
309 if (err < 0)
310 return err;
311
312 *ucblocks = (buf[0] << 8) | buf[1];
313 return 0;
314 }
315
lgdt330x_set_parameters(struct dvb_frontend * fe)316 static int lgdt330x_set_parameters(struct dvb_frontend *fe)
317 {
318 struct dtv_frontend_properties *p = &fe->dtv_property_cache;
319 /*
320 * Array of byte pairs <address, value>
321 * to initialize 8VSB for lgdt3303 chip 50 MHz IF
322 */
323 static u8 lgdt3303_8vsb_44_data[] = {
324 0x04, 0x00,
325 0x0d, 0x40,
326 0x0e, 0x87,
327 0x0f, 0x8e,
328 0x10, 0x01,
329 0x47, 0x8b };
330
331 /*
332 * Array of byte pairs <address, value>
333 * to initialize QAM for lgdt3303 chip
334 */
335 static u8 lgdt3303_qam_data[] = {
336 0x04, 0x00,
337 0x0d, 0x00,
338 0x0e, 0x00,
339 0x0f, 0x00,
340 0x10, 0x00,
341 0x51, 0x63,
342 0x47, 0x66,
343 0x48, 0x66,
344 0x4d, 0x1a,
345 0x49, 0x08,
346 0x4a, 0x9b };
347
348 struct lgdt330x_state* state = fe->demodulator_priv;
349
350 static u8 top_ctrl_cfg[] = { TOP_CONTROL, 0x03 };
351
352 int err = 0;
353 /* Change only if we are actually changing the modulation */
354 if (state->current_modulation != p->modulation) {
355 switch (p->modulation) {
356 case VSB_8:
357 dprintk("%s: VSB_8 MODE\n", __func__);
358
359 /* Select VSB mode */
360 top_ctrl_cfg[1] = 0x03;
361
362 /* Select ANT connector if supported by card */
363 if (state->config->pll_rf_set)
364 state->config->pll_rf_set(fe, 1);
365
366 if (state->config->demod_chip == LGDT3303) {
367 err = i2c_write_demod_bytes(state, lgdt3303_8vsb_44_data,
368 sizeof(lgdt3303_8vsb_44_data));
369 }
370 break;
371
372 case QAM_64:
373 dprintk("%s: QAM_64 MODE\n", __func__);
374
375 /* Select QAM_64 mode */
376 top_ctrl_cfg[1] = 0x00;
377
378 /* Select CABLE connector if supported by card */
379 if (state->config->pll_rf_set)
380 state->config->pll_rf_set(fe, 0);
381
382 if (state->config->demod_chip == LGDT3303) {
383 err = i2c_write_demod_bytes(state, lgdt3303_qam_data,
384 sizeof(lgdt3303_qam_data));
385 }
386 break;
387
388 case QAM_256:
389 dprintk("%s: QAM_256 MODE\n", __func__);
390
391 /* Select QAM_256 mode */
392 top_ctrl_cfg[1] = 0x01;
393
394 /* Select CABLE connector if supported by card */
395 if (state->config->pll_rf_set)
396 state->config->pll_rf_set(fe, 0);
397
398 if (state->config->demod_chip == LGDT3303) {
399 err = i2c_write_demod_bytes(state, lgdt3303_qam_data,
400 sizeof(lgdt3303_qam_data));
401 }
402 break;
403 default:
404 printk(KERN_WARNING "lgdt330x: %s: Modulation type(%d) UNSUPPORTED\n", __func__, p->modulation);
405 return -1;
406 }
407 if (err < 0)
408 printk(KERN_WARNING "lgdt330x: %s: error blasting "
409 "bytes to lgdt3303 for modulation type(%d)\n",
410 __func__, p->modulation);
411
412 /*
413 * select serial or parallel MPEG harware interface
414 * Serial: 0x04 for LGDT3302 or 0x40 for LGDT3303
415 * Parallel: 0x00
416 */
417 top_ctrl_cfg[1] |= state->config->serial_mpeg;
418
419 /* Select the requested mode */
420 i2c_write_demod_bytes(state, top_ctrl_cfg,
421 sizeof(top_ctrl_cfg));
422 if (state->config->set_ts_params)
423 state->config->set_ts_params(fe, 0);
424 state->current_modulation = p->modulation;
425 }
426
427 /* Tune to the specified frequency */
428 if (fe->ops.tuner_ops.set_params) {
429 fe->ops.tuner_ops.set_params(fe);
430 if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
431 }
432
433 /* Keep track of the new frequency */
434 /* FIXME this is the wrong way to do this... */
435 /* The tuner is shared with the video4linux analog API */
436 state->current_frequency = p->frequency;
437
438 lgdt330x_SwReset(state);
439 return 0;
440 }
441
lgdt330x_get_frontend(struct dvb_frontend * fe)442 static int lgdt330x_get_frontend(struct dvb_frontend *fe)
443 {
444 struct dtv_frontend_properties *p = &fe->dtv_property_cache;
445 struct lgdt330x_state *state = fe->demodulator_priv;
446 p->frequency = state->current_frequency;
447 return 0;
448 }
449
lgdt3302_read_status(struct dvb_frontend * fe,fe_status_t * status)450 static int lgdt3302_read_status(struct dvb_frontend* fe, fe_status_t* status)
451 {
452 struct lgdt330x_state* state = fe->demodulator_priv;
453 u8 buf[3];
454
455 *status = 0; /* Reset status result */
456
457 /* AGC status register */
458 i2c_read_demod_bytes(state, AGC_STATUS, buf, 1);
459 dprintk("%s: AGC_STATUS = 0x%02x\n", __func__, buf[0]);
460 if ((buf[0] & 0x0c) == 0x8){
461 /* Test signal does not exist flag */
462 /* as well as the AGC lock flag. */
463 *status |= FE_HAS_SIGNAL;
464 }
465
466 /*
467 * You must set the Mask bits to 1 in the IRQ_MASK in order
468 * to see that status bit in the IRQ_STATUS register.
469 * This is done in SwReset();
470 */
471 /* signal status */
472 i2c_read_demod_bytes(state, TOP_CONTROL, buf, sizeof(buf));
473 dprintk("%s: TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n", __func__, buf[0], buf[1], buf[2]);
474
475
476 /* sync status */
477 if ((buf[2] & 0x03) == 0x01) {
478 *status |= FE_HAS_SYNC;
479 }
480
481 /* FEC error status */
482 if ((buf[2] & 0x0c) == 0x08) {
483 *status |= FE_HAS_LOCK;
484 *status |= FE_HAS_VITERBI;
485 }
486
487 /* Carrier Recovery Lock Status Register */
488 i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
489 dprintk("%s: CARRIER_LOCK = 0x%02x\n", __func__, buf[0]);
490 switch (state->current_modulation) {
491 case QAM_256:
492 case QAM_64:
493 /* Need to understand why there are 3 lock levels here */
494 if ((buf[0] & 0x07) == 0x07)
495 *status |= FE_HAS_CARRIER;
496 break;
497 case VSB_8:
498 if ((buf[0] & 0x80) == 0x80)
499 *status |= FE_HAS_CARRIER;
500 break;
501 default:
502 printk(KERN_WARNING "lgdt330x: %s: Modulation set to unsupported value\n", __func__);
503 }
504
505 return 0;
506 }
507
lgdt3303_read_status(struct dvb_frontend * fe,fe_status_t * status)508 static int lgdt3303_read_status(struct dvb_frontend* fe, fe_status_t* status)
509 {
510 struct lgdt330x_state* state = fe->demodulator_priv;
511 int err;
512 u8 buf[3];
513
514 *status = 0; /* Reset status result */
515
516 /* lgdt3303 AGC status register */
517 err = i2c_read_demod_bytes(state, 0x58, buf, 1);
518 if (err < 0)
519 return err;
520
521 dprintk("%s: AGC_STATUS = 0x%02x\n", __func__, buf[0]);
522 if ((buf[0] & 0x21) == 0x01){
523 /* Test input signal does not exist flag */
524 /* as well as the AGC lock flag. */
525 *status |= FE_HAS_SIGNAL;
526 }
527
528 /* Carrier Recovery Lock Status Register */
529 i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
530 dprintk("%s: CARRIER_LOCK = 0x%02x\n", __func__, buf[0]);
531 switch (state->current_modulation) {
532 case QAM_256:
533 case QAM_64:
534 /* Need to understand why there are 3 lock levels here */
535 if ((buf[0] & 0x07) == 0x07)
536 *status |= FE_HAS_CARRIER;
537 else
538 break;
539 i2c_read_demod_bytes(state, 0x8a, buf, 1);
540 if ((buf[0] & 0x04) == 0x04)
541 *status |= FE_HAS_SYNC;
542 if ((buf[0] & 0x01) == 0x01)
543 *status |= FE_HAS_LOCK;
544 if ((buf[0] & 0x08) == 0x08)
545 *status |= FE_HAS_VITERBI;
546 break;
547 case VSB_8:
548 if ((buf[0] & 0x80) == 0x80)
549 *status |= FE_HAS_CARRIER;
550 else
551 break;
552 i2c_read_demod_bytes(state, 0x38, buf, 1);
553 if ((buf[0] & 0x02) == 0x00)
554 *status |= FE_HAS_SYNC;
555 if ((buf[0] & 0x01) == 0x01) {
556 *status |= FE_HAS_LOCK;
557 *status |= FE_HAS_VITERBI;
558 }
559 break;
560 default:
561 printk(KERN_WARNING "lgdt330x: %s: Modulation set to unsupported value\n", __func__);
562 }
563 return 0;
564 }
565
566 /* Calculate SNR estimation (scaled by 2^24)
567
568 8-VSB SNR equations from LGDT3302 and LGDT3303 datasheets, QAM
569 equations from LGDT3303 datasheet. VSB is the same between the '02
570 and '03, so maybe QAM is too? Perhaps someone with a newer datasheet
571 that has QAM information could verify?
572
573 For 8-VSB: (two ways, take your pick)
574 LGDT3302:
575 SNR_EQ = 10 * log10(25 * 24^2 / EQ_MSE)
576 LGDT3303:
577 SNR_EQ = 10 * log10(25 * 32^2 / EQ_MSE)
578 LGDT3302 & LGDT3303:
579 SNR_PT = 10 * log10(25 * 32^2 / PT_MSE) (we use this one)
580 For 64-QAM:
581 SNR = 10 * log10( 688128 / MSEQAM)
582 For 256-QAM:
583 SNR = 10 * log10( 696320 / MSEQAM)
584
585 We re-write the snr equation as:
586 SNR * 2^24 = 10*(c - intlog10(MSE))
587 Where for 256-QAM, c = log10(696320) * 2^24, and so on. */
588
calculate_snr(u32 mse,u32 c)589 static u32 calculate_snr(u32 mse, u32 c)
590 {
591 if (mse == 0) /* No signal */
592 return 0;
593
594 mse = intlog10(mse);
595 if (mse > c) {
596 /* Negative SNR, which is possible, but realisticly the
597 demod will lose lock before the signal gets this bad. The
598 API only allows for unsigned values, so just return 0 */
599 return 0;
600 }
601 return 10*(c - mse);
602 }
603
lgdt3302_read_snr(struct dvb_frontend * fe,u16 * snr)604 static int lgdt3302_read_snr(struct dvb_frontend* fe, u16* snr)
605 {
606 struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
607 u8 buf[5]; /* read data buffer */
608 u32 noise; /* noise value */
609 u32 c; /* per-modulation SNR calculation constant */
610
611 switch(state->current_modulation) {
612 case VSB_8:
613 i2c_read_demod_bytes(state, LGDT3302_EQPH_ERR0, buf, 5);
614 #ifdef USE_EQMSE
615 /* Use Equalizer Mean-Square Error Register */
616 /* SNR for ranges from -15.61 to +41.58 */
617 noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2];
618 c = 69765745; /* log10(25*24^2)*2^24 */
619 #else
620 /* Use Phase Tracker Mean-Square Error Register */
621 /* SNR for ranges from -13.11 to +44.08 */
622 noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
623 c = 73957994; /* log10(25*32^2)*2^24 */
624 #endif
625 break;
626 case QAM_64:
627 case QAM_256:
628 i2c_read_demod_bytes(state, CARRIER_MSEQAM1, buf, 2);
629 noise = ((buf[0] & 3) << 8) | buf[1];
630 c = state->current_modulation == QAM_64 ? 97939837 : 98026066;
631 /* log10(688128)*2^24 and log10(696320)*2^24 */
632 break;
633 default:
634 printk(KERN_ERR "lgdt330x: %s: Modulation set to unsupported value\n",
635 __func__);
636 return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
637 }
638
639 state->snr = calculate_snr(noise, c);
640 *snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
641
642 dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
643 state->snr >> 24, (((state->snr>>8) & 0xffff) * 100) >> 16);
644
645 return 0;
646 }
647
lgdt3303_read_snr(struct dvb_frontend * fe,u16 * snr)648 static int lgdt3303_read_snr(struct dvb_frontend* fe, u16* snr)
649 {
650 struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
651 u8 buf[5]; /* read data buffer */
652 u32 noise; /* noise value */
653 u32 c; /* per-modulation SNR calculation constant */
654
655 switch(state->current_modulation) {
656 case VSB_8:
657 i2c_read_demod_bytes(state, LGDT3303_EQPH_ERR0, buf, 5);
658 #ifdef USE_EQMSE
659 /* Use Equalizer Mean-Square Error Register */
660 /* SNR for ranges from -16.12 to +44.08 */
661 noise = ((buf[0] & 0x78) << 13) | (buf[1] << 8) | buf[2];
662 c = 73957994; /* log10(25*32^2)*2^24 */
663 #else
664 /* Use Phase Tracker Mean-Square Error Register */
665 /* SNR for ranges from -13.11 to +44.08 */
666 noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4];
667 c = 73957994; /* log10(25*32^2)*2^24 */
668 #endif
669 break;
670 case QAM_64:
671 case QAM_256:
672 i2c_read_demod_bytes(state, CARRIER_MSEQAM1, buf, 2);
673 noise = (buf[0] << 8) | buf[1];
674 c = state->current_modulation == QAM_64 ? 97939837 : 98026066;
675 /* log10(688128)*2^24 and log10(696320)*2^24 */
676 break;
677 default:
678 printk(KERN_ERR "lgdt330x: %s: Modulation set to unsupported value\n",
679 __func__);
680 return -EREMOTEIO; /* return -EDRIVER_IS_GIBBERED; */
681 }
682
683 state->snr = calculate_snr(noise, c);
684 *snr = (state->snr) >> 16; /* Convert from 8.24 fixed-point to 8.8 */
685
686 dprintk("%s: noise = 0x%08x, snr = %d.%02d dB\n", __func__, noise,
687 state->snr >> 24, (((state->snr >> 8) & 0xffff) * 100) >> 16);
688
689 return 0;
690 }
691
lgdt330x_read_signal_strength(struct dvb_frontend * fe,u16 * strength)692 static int lgdt330x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
693 {
694 /* Calculate Strength from SNR up to 35dB */
695 /* Even though the SNR can go higher than 35dB, there is some comfort */
696 /* factor in having a range of strong signals that can show at 100% */
697 struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
698 u16 snr;
699 int ret;
700
701 ret = fe->ops.read_snr(fe, &snr);
702 if (ret != 0)
703 return ret;
704 /* Rather than use the 8.8 value snr, use state->snr which is 8.24 */
705 /* scale the range 0 - 35*2^24 into 0 - 65535 */
706 if (state->snr >= 8960 * 0x10000)
707 *strength = 0xffff;
708 else
709 *strength = state->snr / 8960;
710
711 return 0;
712 }
713
lgdt330x_get_tune_settings(struct dvb_frontend * fe,struct dvb_frontend_tune_settings * fe_tune_settings)714 static int lgdt330x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
715 {
716 /* I have no idea about this - it may not be needed */
717 fe_tune_settings->min_delay_ms = 500;
718 fe_tune_settings->step_size = 0;
719 fe_tune_settings->max_drift = 0;
720 return 0;
721 }
722
lgdt330x_release(struct dvb_frontend * fe)723 static void lgdt330x_release(struct dvb_frontend* fe)
724 {
725 struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
726 kfree(state);
727 }
728
729 static struct dvb_frontend_ops lgdt3302_ops;
730 static struct dvb_frontend_ops lgdt3303_ops;
731
lgdt330x_attach(const struct lgdt330x_config * config,struct i2c_adapter * i2c)732 struct dvb_frontend* lgdt330x_attach(const struct lgdt330x_config* config,
733 struct i2c_adapter* i2c)
734 {
735 struct lgdt330x_state* state = NULL;
736 u8 buf[1];
737
738 /* Allocate memory for the internal state */
739 state = kzalloc(sizeof(struct lgdt330x_state), GFP_KERNEL);
740 if (state == NULL)
741 goto error;
742
743 /* Setup the state */
744 state->config = config;
745 state->i2c = i2c;
746
747 /* Create dvb_frontend */
748 switch (config->demod_chip) {
749 case LGDT3302:
750 memcpy(&state->frontend.ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops));
751 break;
752 case LGDT3303:
753 memcpy(&state->frontend.ops, &lgdt3303_ops, sizeof(struct dvb_frontend_ops));
754 break;
755 default:
756 goto error;
757 }
758 state->frontend.demodulator_priv = state;
759
760 /* Verify communication with demod chip */
761 if (i2c_read_demod_bytes(state, 2, buf, 1))
762 goto error;
763
764 state->current_frequency = -1;
765 state->current_modulation = -1;
766
767 return &state->frontend;
768
769 error:
770 kfree(state);
771 dprintk("%s: ERROR\n",__func__);
772 return NULL;
773 }
774
775 static struct dvb_frontend_ops lgdt3302_ops = {
776 .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
777 .info = {
778 .name= "LG Electronics LGDT3302 VSB/QAM Frontend",
779 .frequency_min= 54000000,
780 .frequency_max= 858000000,
781 .frequency_stepsize= 62500,
782 .symbol_rate_min = 5056941, /* QAM 64 */
783 .symbol_rate_max = 10762000, /* VSB 8 */
784 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
785 },
786 .init = lgdt330x_init,
787 .set_frontend = lgdt330x_set_parameters,
788 .get_frontend = lgdt330x_get_frontend,
789 .get_tune_settings = lgdt330x_get_tune_settings,
790 .read_status = lgdt3302_read_status,
791 .read_ber = lgdt330x_read_ber,
792 .read_signal_strength = lgdt330x_read_signal_strength,
793 .read_snr = lgdt3302_read_snr,
794 .read_ucblocks = lgdt330x_read_ucblocks,
795 .release = lgdt330x_release,
796 };
797
798 static struct dvb_frontend_ops lgdt3303_ops = {
799 .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
800 .info = {
801 .name= "LG Electronics LGDT3303 VSB/QAM Frontend",
802 .frequency_min= 54000000,
803 .frequency_max= 858000000,
804 .frequency_stepsize= 62500,
805 .symbol_rate_min = 5056941, /* QAM 64 */
806 .symbol_rate_max = 10762000, /* VSB 8 */
807 .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
808 },
809 .init = lgdt330x_init,
810 .set_frontend = lgdt330x_set_parameters,
811 .get_frontend = lgdt330x_get_frontend,
812 .get_tune_settings = lgdt330x_get_tune_settings,
813 .read_status = lgdt3303_read_status,
814 .read_ber = lgdt330x_read_ber,
815 .read_signal_strength = lgdt330x_read_signal_strength,
816 .read_snr = lgdt3303_read_snr,
817 .read_ucblocks = lgdt330x_read_ucblocks,
818 .release = lgdt330x_release,
819 };
820
821 MODULE_DESCRIPTION("LGDT330X (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver");
822 MODULE_AUTHOR("Wilson Michaels");
823 MODULE_LICENSE("GPL");
824
825 EXPORT_SYMBOL(lgdt330x_attach);
826
827 /*
828 * Local variables:
829 * c-basic-offset: 8
830 * End:
831 */
832