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V4L/DVB (6820): s5h1409: QAM SNR related fixes
[linux-2.6] / drivers / media / dvb / frontends / mt352.c
1 /*
2  *  Driver for Zarlink DVB-T MT352 demodulator
3  *
4  *  Written by Holger Waechtler <holger@qanu.de>
5  *       and Daniel Mack <daniel@qanu.de>
6  *
7  *  AVerMedia AVerTV DVB-T 771 support by
8  *       Wolfram Joost <dbox2@frokaschwei.de>
9  *
10  *  Support for Samsung TDTC9251DH01C(M) tuner
11  *  Copyright (C) 2004 Antonio Mancuso <antonio.mancuso@digitaltelevision.it>
12  *                     Amauri  Celani  <acelani@essegi.net>
13  *
14  *  DVICO FusionHDTV DVB-T1 and DVICO FusionHDTV DVB-T Lite support by
15  *       Christopher Pascoe <c.pascoe@itee.uq.edu.au>
16  *
17  *  This program is free software; you can redistribute it and/or modify
18  *  it under the terms of the GNU General Public License as published by
19  *  the Free Software Foundation; either version 2 of the License, or
20  *  (at your option) any later version.
21  *
22  *  This program is distributed in the hope that it will be useful,
23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25  *
26  *  GNU General Public License for more details.
27  *
28  *  You should have received a copy of the GNU General Public License
29  *  along with this program; if not, write to the Free Software
30  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.=
31  */
32
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/delay.h>
37 #include <linux/string.h>
38 #include <linux/slab.h>
39
40 #include "dvb_frontend.h"
41 #include "mt352_priv.h"
42 #include "mt352.h"
43
44 struct mt352_state {
45         struct i2c_adapter* i2c;
46         struct dvb_frontend frontend;
47
48         /* configuration settings */
49         struct mt352_config config;
50 };
51
52 static int debug;
53 #define dprintk(args...) \
54         do { \
55                 if (debug) printk(KERN_DEBUG "mt352: " args); \
56         } while (0)
57
58 static int mt352_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
59 {
60         struct mt352_state* state = fe->demodulator_priv;
61         u8 buf[2] = { reg, val };
62         struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
63                                .buf = buf, .len = 2 };
64         int err = i2c_transfer(state->i2c, &msg, 1);
65         if (err != 1) {
66                 printk("mt352_write() to reg %x failed (err = %d)!\n", reg, err);
67                 return err;
68         }
69         return 0;
70 }
71
72 static int _mt352_write(struct dvb_frontend* fe, u8* ibuf, int ilen)
73 {
74         int err,i;
75         for (i=0; i < ilen-1; i++)
76                 if ((err = mt352_single_write(fe,ibuf[0]+i,ibuf[i+1])))
77                         return err;
78
79         return 0;
80 }
81
82 static int mt352_read_register(struct mt352_state* state, u8 reg)
83 {
84         int ret;
85         u8 b0 [] = { reg };
86         u8 b1 [] = { 0 };
87         struct i2c_msg msg [] = { { .addr = state->config.demod_address,
88                                     .flags = 0,
89                                     .buf = b0, .len = 1 },
90                                   { .addr = state->config.demod_address,
91                                     .flags = I2C_M_RD,
92                                     .buf = b1, .len = 1 } };
93
94         ret = i2c_transfer(state->i2c, msg, 2);
95
96         if (ret != 2) {
97                 printk("%s: readreg error (reg=%d, ret==%i)\n",
98                        __FUNCTION__, reg, ret);
99                 return ret;
100         }
101
102         return b1[0];
103 }
104
105 static int mt352_sleep(struct dvb_frontend* fe)
106 {
107         static u8 mt352_softdown[] = { CLOCK_CTL, 0x20, 0x08 };
108
109         _mt352_write(fe, mt352_softdown, sizeof(mt352_softdown));
110         return 0;
111 }
112
113 static void mt352_calc_nominal_rate(struct mt352_state* state,
114                                     enum fe_bandwidth bandwidth,
115                                     unsigned char *buf)
116 {
117         u32 adc_clock = 20480; /* 20.340 MHz */
118         u32 bw,value;
119
120         switch (bandwidth) {
121         case BANDWIDTH_6_MHZ:
122                 bw = 6;
123                 break;
124         case BANDWIDTH_7_MHZ:
125                 bw = 7;
126                 break;
127         case BANDWIDTH_8_MHZ:
128         default:
129                 bw = 8;
130                 break;
131         }
132         if (state->config.adc_clock)
133                 adc_clock = state->config.adc_clock;
134
135         value = 64 * bw * (1<<16) / (7 * 8);
136         value = value * 1000 / adc_clock;
137         dprintk("%s: bw %d, adc_clock %d => 0x%x\n",
138                 __FUNCTION__, bw, adc_clock, value);
139         buf[0] = msb(value);
140         buf[1] = lsb(value);
141 }
142
143 static void mt352_calc_input_freq(struct mt352_state* state,
144                                   unsigned char *buf)
145 {
146         int adc_clock = 20480; /* 20.480000 MHz */
147         int if2       = 36167; /* 36.166667 MHz */
148         int ife,value;
149
150         if (state->config.adc_clock)
151                 adc_clock = state->config.adc_clock;
152         if (state->config.if2)
153                 if2 = state->config.if2;
154
155         ife = (2*adc_clock - if2);
156         value = -16374 * ife / adc_clock;
157         dprintk("%s: if2 %d, ife %d, adc_clock %d => %d / 0x%x\n",
158                 __FUNCTION__, if2, ife, adc_clock, value, value & 0x3fff);
159         buf[0] = msb(value);
160         buf[1] = lsb(value);
161 }
162
163 static int mt352_set_parameters(struct dvb_frontend* fe,
164                                 struct dvb_frontend_parameters *param)
165 {
166         struct mt352_state* state = fe->demodulator_priv;
167         unsigned char buf[13];
168         static unsigned char tuner_go[] = { 0x5d, 0x01 };
169         static unsigned char fsm_go[]   = { 0x5e, 0x01 };
170         unsigned int tps = 0;
171         struct dvb_ofdm_parameters *op = &param->u.ofdm;
172
173         switch (op->code_rate_HP) {
174                 case FEC_2_3:
175                         tps |= (1 << 7);
176                         break;
177                 case FEC_3_4:
178                         tps |= (2 << 7);
179                         break;
180                 case FEC_5_6:
181                         tps |= (3 << 7);
182                         break;
183                 case FEC_7_8:
184                         tps |= (4 << 7);
185                         break;
186                 case FEC_1_2:
187                 case FEC_AUTO:
188                         break;
189                 default:
190                         return -EINVAL;
191         }
192
193         switch (op->code_rate_LP) {
194                 case FEC_2_3:
195                         tps |= (1 << 4);
196                         break;
197                 case FEC_3_4:
198                         tps |= (2 << 4);
199                         break;
200                 case FEC_5_6:
201                         tps |= (3 << 4);
202                         break;
203                 case FEC_7_8:
204                         tps |= (4 << 4);
205                         break;
206                 case FEC_1_2:
207                 case FEC_AUTO:
208                         break;
209                 case FEC_NONE:
210                         if (op->hierarchy_information == HIERARCHY_AUTO ||
211                             op->hierarchy_information == HIERARCHY_NONE)
212                                 break;
213                 default:
214                         return -EINVAL;
215         }
216
217         switch (op->constellation) {
218                 case QPSK:
219                         break;
220                 case QAM_AUTO:
221                 case QAM_16:
222                         tps |= (1 << 13);
223                         break;
224                 case QAM_64:
225                         tps |= (2 << 13);
226                         break;
227                 default:
228                         return -EINVAL;
229         }
230
231         switch (op->transmission_mode) {
232                 case TRANSMISSION_MODE_2K:
233                 case TRANSMISSION_MODE_AUTO:
234                         break;
235                 case TRANSMISSION_MODE_8K:
236                         tps |= (1 << 0);
237                         break;
238                 default:
239                         return -EINVAL;
240         }
241
242         switch (op->guard_interval) {
243                 case GUARD_INTERVAL_1_32:
244                 case GUARD_INTERVAL_AUTO:
245                         break;
246                 case GUARD_INTERVAL_1_16:
247                         tps |= (1 << 2);
248                         break;
249                 case GUARD_INTERVAL_1_8:
250                         tps |= (2 << 2);
251                         break;
252                 case GUARD_INTERVAL_1_4:
253                         tps |= (3 << 2);
254                         break;
255                 default:
256                         return -EINVAL;
257         }
258
259         switch (op->hierarchy_information) {
260                 case HIERARCHY_AUTO:
261                 case HIERARCHY_NONE:
262                         break;
263                 case HIERARCHY_1:
264                         tps |= (1 << 10);
265                         break;
266                 case HIERARCHY_2:
267                         tps |= (2 << 10);
268                         break;
269                 case HIERARCHY_4:
270                         tps |= (3 << 10);
271                         break;
272                 default:
273                         return -EINVAL;
274         }
275
276
277         buf[0] = TPS_GIVEN_1; /* TPS_GIVEN_1 and following registers */
278
279         buf[1] = msb(tps);      /* TPS_GIVEN_(1|0) */
280         buf[2] = lsb(tps);
281
282         buf[3] = 0x50;  // old
283 //      buf[3] = 0xf4;  // pinnacle
284
285         mt352_calc_nominal_rate(state, op->bandwidth, buf+4);
286         mt352_calc_input_freq(state, buf+6);
287
288         if (state->config.no_tuner) {
289                 if (fe->ops.tuner_ops.set_params) {
290                         fe->ops.tuner_ops.set_params(fe, param);
291                         if (fe->ops.i2c_gate_ctrl)
292                                 fe->ops.i2c_gate_ctrl(fe, 0);
293                 }
294
295                 _mt352_write(fe, buf, 8);
296                 _mt352_write(fe, fsm_go, 2);
297         } else {
298                 if (fe->ops.tuner_ops.calc_regs) {
299                         fe->ops.tuner_ops.calc_regs(fe, param, buf+8, 5);
300                         buf[8] <<= 1;
301                         _mt352_write(fe, buf, sizeof(buf));
302                         _mt352_write(fe, tuner_go, 2);
303                 }
304         }
305
306         return 0;
307 }
308
309 static int mt352_get_parameters(struct dvb_frontend* fe,
310                                 struct dvb_frontend_parameters *param)
311 {
312         struct mt352_state* state = fe->demodulator_priv;
313         u16 tps;
314         u16 div;
315         u8 trl;
316         struct dvb_ofdm_parameters *op = &param->u.ofdm;
317         static const u8 tps_fec_to_api[8] =
318         {
319                 FEC_1_2,
320                 FEC_2_3,
321                 FEC_3_4,
322                 FEC_5_6,
323                 FEC_7_8,
324                 FEC_AUTO,
325                 FEC_AUTO,
326                 FEC_AUTO
327         };
328
329         if ( (mt352_read_register(state,0x00) & 0xC0) != 0xC0 )
330                 return -EINVAL;
331
332         /* Use TPS_RECEIVED-registers, not the TPS_CURRENT-registers because
333          * the mt352 sometimes works with the wrong parameters
334          */
335         tps = (mt352_read_register(state, TPS_RECEIVED_1) << 8) | mt352_read_register(state, TPS_RECEIVED_0);
336         div = (mt352_read_register(state, CHAN_START_1) << 8) | mt352_read_register(state, CHAN_START_0);
337         trl = mt352_read_register(state, TRL_NOMINAL_RATE_1);
338
339         op->code_rate_HP = tps_fec_to_api[(tps >> 7) & 7];
340         op->code_rate_LP = tps_fec_to_api[(tps >> 4) & 7];
341
342         switch ( (tps >> 13) & 3)
343         {
344                 case 0:
345                         op->constellation = QPSK;
346                         break;
347                 case 1:
348                         op->constellation = QAM_16;
349                         break;
350                 case 2:
351                         op->constellation = QAM_64;
352                         break;
353                 default:
354                         op->constellation = QAM_AUTO;
355                         break;
356         }
357
358         op->transmission_mode = (tps & 0x01) ? TRANSMISSION_MODE_8K : TRANSMISSION_MODE_2K;
359
360         switch ( (tps >> 2) & 3)
361         {
362                 case 0:
363                         op->guard_interval = GUARD_INTERVAL_1_32;
364                         break;
365                 case 1:
366                         op->guard_interval = GUARD_INTERVAL_1_16;
367                         break;
368                 case 2:
369                         op->guard_interval = GUARD_INTERVAL_1_8;
370                         break;
371                 case 3:
372                         op->guard_interval = GUARD_INTERVAL_1_4;
373                         break;
374                 default:
375                         op->guard_interval = GUARD_INTERVAL_AUTO;
376                         break;
377         }
378
379         switch ( (tps >> 10) & 7)
380         {
381                 case 0:
382                         op->hierarchy_information = HIERARCHY_NONE;
383                         break;
384                 case 1:
385                         op->hierarchy_information = HIERARCHY_1;
386                         break;
387                 case 2:
388                         op->hierarchy_information = HIERARCHY_2;
389                         break;
390                 case 3:
391                         op->hierarchy_information = HIERARCHY_4;
392                         break;
393                 default:
394                         op->hierarchy_information = HIERARCHY_AUTO;
395                         break;
396         }
397
398         param->frequency = ( 500 * (div - IF_FREQUENCYx6) ) / 3 * 1000;
399
400         if (trl == 0x72)
401                 op->bandwidth = BANDWIDTH_8_MHZ;
402         else if (trl == 0x64)
403                 op->bandwidth = BANDWIDTH_7_MHZ;
404         else
405                 op->bandwidth = BANDWIDTH_6_MHZ;
406
407
408         if (mt352_read_register(state, STATUS_2) & 0x02)
409                 param->inversion = INVERSION_OFF;
410         else
411                 param->inversion = INVERSION_ON;
412
413         return 0;
414 }
415
416 static int mt352_read_status(struct dvb_frontend* fe, fe_status_t* status)
417 {
418         struct mt352_state* state = fe->demodulator_priv;
419         int s0, s1, s3;
420
421         /* FIXME:
422          *
423          * The MT352 design manual from Zarlink states (page 46-47):
424          *
425          * Notes about the TUNER_GO register:
426          *
427          * If the Read_Tuner_Byte (bit-1) is activated, then the tuner status
428          * byte is copied from the tuner to the STATUS_3 register and
429          * completion of the read operation is indicated by bit-5 of the
430          * INTERRUPT_3 register.
431          */
432
433         if ((s0 = mt352_read_register(state, STATUS_0)) < 0)
434                 return -EREMOTEIO;
435         if ((s1 = mt352_read_register(state, STATUS_1)) < 0)
436                 return -EREMOTEIO;
437         if ((s3 = mt352_read_register(state, STATUS_3)) < 0)
438                 return -EREMOTEIO;
439
440         *status = 0;
441         if (s0 & (1 << 4))
442                 *status |= FE_HAS_CARRIER;
443         if (s0 & (1 << 1))
444                 *status |= FE_HAS_VITERBI;
445         if (s0 & (1 << 5))
446                 *status |= FE_HAS_LOCK;
447         if (s1 & (1 << 1))
448                 *status |= FE_HAS_SYNC;
449         if (s3 & (1 << 6))
450                 *status |= FE_HAS_SIGNAL;
451
452         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
453                       (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
454                 *status &= ~FE_HAS_LOCK;
455
456         return 0;
457 }
458
459 static int mt352_read_ber(struct dvb_frontend* fe, u32* ber)
460 {
461         struct mt352_state* state = fe->demodulator_priv;
462
463         *ber = (mt352_read_register (state, RS_ERR_CNT_2) << 16) |
464                (mt352_read_register (state, RS_ERR_CNT_1) << 8) |
465                (mt352_read_register (state, RS_ERR_CNT_0));
466
467         return 0;
468 }
469
470 static int mt352_read_signal_strength(struct dvb_frontend* fe, u16* strength)
471 {
472         struct mt352_state* state = fe->demodulator_priv;
473
474         /* align the 12 bit AGC gain with the most significant bits */
475         u16 signal = ((mt352_read_register(state, AGC_GAIN_1) & 0x0f) << 12) |
476                 (mt352_read_register(state, AGC_GAIN_0) << 4);
477
478         /* inverse of gain is signal strength */
479         *strength = ~signal;
480         return 0;
481 }
482
483 static int mt352_read_snr(struct dvb_frontend* fe, u16* snr)
484 {
485         struct mt352_state* state = fe->demodulator_priv;
486
487         u8 _snr = mt352_read_register (state, SNR);
488         *snr = (_snr << 8) | _snr;
489
490         return 0;
491 }
492
493 static int mt352_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
494 {
495         struct mt352_state* state = fe->demodulator_priv;
496
497         *ucblocks = (mt352_read_register (state,  RS_UBC_1) << 8) |
498                     (mt352_read_register (state,  RS_UBC_0));
499
500         return 0;
501 }
502
503 static int mt352_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
504 {
505         fe_tune_settings->min_delay_ms = 800;
506         fe_tune_settings->step_size = 0;
507         fe_tune_settings->max_drift = 0;
508
509         return 0;
510 }
511
512 static int mt352_init(struct dvb_frontend* fe)
513 {
514         struct mt352_state* state = fe->demodulator_priv;
515
516         static u8 mt352_reset_attach [] = { RESET, 0xC0 };
517
518         dprintk("%s: hello\n",__FUNCTION__);
519
520         if ((mt352_read_register(state, CLOCK_CTL) & 0x10) == 0 ||
521             (mt352_read_register(state, CONFIG) & 0x20) == 0) {
522
523                 /* Do a "hard" reset */
524                 _mt352_write(fe, mt352_reset_attach, sizeof(mt352_reset_attach));
525                 return state->config.demod_init(fe);
526         }
527
528         return 0;
529 }
530
531 static void mt352_release(struct dvb_frontend* fe)
532 {
533         struct mt352_state* state = fe->demodulator_priv;
534         kfree(state);
535 }
536
537 static struct dvb_frontend_ops mt352_ops;
538
539 struct dvb_frontend* mt352_attach(const struct mt352_config* config,
540                                   struct i2c_adapter* i2c)
541 {
542         struct mt352_state* state = NULL;
543
544         /* allocate memory for the internal state */
545         state = kzalloc(sizeof(struct mt352_state), GFP_KERNEL);
546         if (state == NULL) goto error;
547
548         /* setup the state */
549         state->i2c = i2c;
550         memcpy(&state->config,config,sizeof(struct mt352_config));
551
552         /* check if the demod is there */
553         if (mt352_read_register(state, CHIP_ID) != ID_MT352) goto error;
554
555         /* create dvb_frontend */
556         memcpy(&state->frontend.ops, &mt352_ops, sizeof(struct dvb_frontend_ops));
557         state->frontend.demodulator_priv = state;
558         return &state->frontend;
559
560 error:
561         kfree(state);
562         return NULL;
563 }
564
565 static struct dvb_frontend_ops mt352_ops = {
566
567         .info = {
568                 .name                   = "Zarlink MT352 DVB-T",
569                 .type                   = FE_OFDM,
570                 .frequency_min          = 174000000,
571                 .frequency_max          = 862000000,
572                 .frequency_stepsize     = 166667,
573                 .frequency_tolerance    = 0,
574                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
575                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
576                         FE_CAN_FEC_AUTO |
577                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
578                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
579                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
580                         FE_CAN_MUTE_TS
581         },
582
583         .release = mt352_release,
584
585         .init = mt352_init,
586         .sleep = mt352_sleep,
587         .write = _mt352_write,
588
589         .set_frontend = mt352_set_parameters,
590         .get_frontend = mt352_get_parameters,
591         .get_tune_settings = mt352_get_tune_settings,
592
593         .read_status = mt352_read_status,
594         .read_ber = mt352_read_ber,
595         .read_signal_strength = mt352_read_signal_strength,
596         .read_snr = mt352_read_snr,
597         .read_ucblocks = mt352_read_ucblocks,
598 };
599
600 module_param(debug, int, 0644);
601 MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
602
603 MODULE_DESCRIPTION("Zarlink MT352 DVB-T Demodulator driver");
604 MODULE_AUTHOR("Holger Waechtler, Daniel Mack, Antonio Mancuso");
605 MODULE_LICENSE("GPL");
606
607 EXPORT_SYMBOL(mt352_attach);