summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-frontends/as102_fe.c
blob: 9412fcd1bddb65f57293b56ffbb80fba3d1cf3dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
/*
 * Abilis Systems Single DVB-T Receiver
 * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
 * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <dvb_frontend.h>

#include "as102_fe.h"

struct as102_state {
	struct dvb_frontend frontend;
	struct as10x_demod_stats demod_stats;

	const struct as102_fe_ops *ops;
	void *priv;
	uint8_t elna_cfg;

	/* signal strength */
	uint16_t signal_strength;
	/* bit error rate */
	uint32_t ber;
};

static uint8_t as102_fe_get_code_rate(enum fe_code_rate arg)
{
	uint8_t c;

	switch (arg) {
	case FEC_1_2:
		c = CODE_RATE_1_2;
		break;
	case FEC_2_3:
		c = CODE_RATE_2_3;
		break;
	case FEC_3_4:
		c = CODE_RATE_3_4;
		break;
	case FEC_5_6:
		c = CODE_RATE_5_6;
		break;
	case FEC_7_8:
		c = CODE_RATE_7_8;
		break;
	default:
		c = CODE_RATE_UNKNOWN;
		break;
	}

	return c;
}

static int as102_fe_set_frontend(struct dvb_frontend *fe)
{
	struct as102_state *state = fe->demodulator_priv;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct as10x_tune_args tune_args = { 0 };

	/* set frequency */
	tune_args.freq = c->frequency / 1000;

	/* fix interleaving_mode */
	tune_args.interleaving_mode = INTLV_NATIVE;

	switch (c->bandwidth_hz) {
	case 8000000:
		tune_args.bandwidth = BW_8_MHZ;
		break;
	case 7000000:
		tune_args.bandwidth = BW_7_MHZ;
		break;
	case 6000000:
		tune_args.bandwidth = BW_6_MHZ;
		break;
	default:
		tune_args.bandwidth = BW_8_MHZ;
	}

	switch (c->guard_interval) {
	case GUARD_INTERVAL_1_32:
		tune_args.guard_interval = GUARD_INT_1_32;
		break;
	case GUARD_INTERVAL_1_16:
		tune_args.guard_interval = GUARD_INT_1_16;
		break;
	case GUARD_INTERVAL_1_8:
		tune_args.guard_interval = GUARD_INT_1_8;
		break;
	case GUARD_INTERVAL_1_4:
		tune_args.guard_interval = GUARD_INT_1_4;
		break;
	case GUARD_INTERVAL_AUTO:
	default:
		tune_args.guard_interval = GUARD_UNKNOWN;
		break;
	}

	switch (c->modulation) {
	case QPSK:
		tune_args.modulation = CONST_QPSK;
		break;
	case QAM_16:
		tune_args.modulation = CONST_QAM16;
		break;
	case QAM_64:
		tune_args.modulation = CONST_QAM64;
		break;
	default:
		tune_args.modulation = CONST_UNKNOWN;
		break;
	}

	switch (c->transmission_mode) {
	case TRANSMISSION_MODE_2K:
		tune_args.transmission_mode = TRANS_MODE_2K;
		break;
	case TRANSMISSION_MODE_8K:
		tune_args.transmission_mode = TRANS_MODE_8K;
		break;
	default:
		tune_args.transmission_mode = TRANS_MODE_UNKNOWN;
	}

	switch (c->hierarchy) {
	case HIERARCHY_NONE:
		tune_args.hierarchy = HIER_NONE;
		break;
	case HIERARCHY_1:
		tune_args.hierarchy = HIER_ALPHA_1;
		break;
	case HIERARCHY_2:
		tune_args.hierarchy = HIER_ALPHA_2;
		break;
	case HIERARCHY_4:
		tune_args.hierarchy = HIER_ALPHA_4;
		break;
	case HIERARCHY_AUTO:
		tune_args.hierarchy = HIER_UNKNOWN;
		break;
	}

	pr_debug("as102: tuner parameters: freq: %d  bw: 0x%02x  gi: 0x%02x\n",
			c->frequency,
			tune_args.bandwidth,
			tune_args.guard_interval);

	/*
	 * Detect a hierarchy selection
	 * if HP/LP are both set to FEC_NONE, HP will be selected.
	 */
	if ((tune_args.hierarchy != HIER_NONE) &&
		       ((c->code_rate_LP == FEC_NONE) ||
			(c->code_rate_HP == FEC_NONE))) {

		if (c->code_rate_LP == FEC_NONE) {
			tune_args.hier_select = HIER_HIGH_PRIORITY;
			tune_args.code_rate =
			   as102_fe_get_code_rate(c->code_rate_HP);
		}

		if (c->code_rate_HP == FEC_NONE) {
			tune_args.hier_select = HIER_LOW_PRIORITY;
			tune_args.code_rate =
			   as102_fe_get_code_rate(c->code_rate_LP);
		}

		pr_debug("as102: \thierarchy: 0x%02x  selected: %s  code_rate_%s: 0x%02x\n",
			tune_args.hierarchy,
			tune_args.hier_select == HIER_HIGH_PRIORITY ?
			"HP" : "LP",
			tune_args.hier_select == HIER_HIGH_PRIORITY ?
			"HP" : "LP",
			tune_args.code_rate);
	} else {
		tune_args.code_rate =
			as102_fe_get_code_rate(c->code_rate_HP);
	}

	/* Set frontend arguments */
	return state->ops->set_tune(state->priv, &tune_args);
}

static int as102_fe_get_frontend(struct dvb_frontend *fe,
				 struct dtv_frontend_properties *c)
{
	struct as102_state *state = fe->demodulator_priv;
	int ret = 0;
	struct as10x_tps tps = { 0 };

	/* send abilis command: GET_TPS */
	ret = state->ops->get_tps(state->priv, &tps);
	if (ret < 0)
		return ret;

	/* extract constellation */
	switch (tps.modulation) {
	case CONST_QPSK:
		c->modulation = QPSK;
		break;
	case CONST_QAM16:
		c->modulation = QAM_16;
		break;
	case CONST_QAM64:
		c->modulation = QAM_64;
		break;
	}

	/* extract hierarchy */
	switch (tps.hierarchy) {
	case HIER_NONE:
		c->hierarchy = HIERARCHY_NONE;
		break;
	case HIER_ALPHA_1:
		c->hierarchy = HIERARCHY_1;
		break;
	case HIER_ALPHA_2:
		c->hierarchy = HIERARCHY_2;
		break;
	case HIER_ALPHA_4:
		c->hierarchy = HIERARCHY_4;
		break;
	}

	/* extract code rate HP */
	switch (tps.code_rate_HP) {
	case CODE_RATE_1_2:
		c->code_rate_HP = FEC_1_2;
		break;
	case CODE_RATE_2_3:
		c->code_rate_HP = FEC_2_3;
		break;
	case CODE_RATE_3_4:
		c->code_rate_HP = FEC_3_4;
		break;
	case CODE_RATE_5_6:
		c->code_rate_HP = FEC_5_6;
		break;
	case CODE_RATE_7_8:
		c->code_rate_HP = FEC_7_8;
		break;
	}

	/* extract code rate LP */
	switch (tps.code_rate_LP) {
	case CODE_RATE_1_2:
		c->code_rate_LP = FEC_1_2;
		break;
	case CODE_RATE_2_3:
		c->code_rate_LP = FEC_2_3;
		break;
	case CODE_RATE_3_4:
		c->code_rate_LP = FEC_3_4;
		break;
	case CODE_RATE_5_6:
		c->code_rate_LP = FEC_5_6;
		break;
	case CODE_RATE_7_8:
		c->code_rate_LP = FEC_7_8;
		break;
	}

	/* extract guard interval */
	switch (tps.guard_interval) {
	case GUARD_INT_1_32:
		c->guard_interval = GUARD_INTERVAL_1_32;
		break;
	case GUARD_INT_1_16:
		c->guard_interval = GUARD_INTERVAL_1_16;
		break;
	case GUARD_INT_1_8:
		c->guard_interval = GUARD_INTERVAL_1_8;
		break;
	case GUARD_INT_1_4:
		c->guard_interval = GUARD_INTERVAL_1_4;
		break;
	}

	/* extract transmission mode */
	switch (tps.transmission_mode) {
	case TRANS_MODE_2K:
		c->transmission_mode = TRANSMISSION_MODE_2K;
		break;
	case TRANS_MODE_8K:
		c->transmission_mode = TRANSMISSION_MODE_8K;
		break;
	}

	return 0;
}

static int as102_fe_get_tune_settings(struct dvb_frontend *fe,
			struct dvb_frontend_tune_settings *settings) {

	settings->min_delay_ms = 1000;

	return 0;
}

static int as102_fe_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
	int ret = 0;
	struct as102_state *state = fe->demodulator_priv;
	struct as10x_tune_status tstate = { 0 };

	/* send abilis command: GET_TUNE_STATUS */
	ret = state->ops->get_status(state->priv, &tstate);
	if (ret < 0)
		return ret;

	state->signal_strength  = tstate.signal_strength;
	state->ber  = tstate.BER;

	switch (tstate.tune_state) {
	case TUNE_STATUS_SIGNAL_DVB_OK:
		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
		break;
	case TUNE_STATUS_STREAM_DETECTED:
		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC |
			  FE_HAS_VITERBI;
		break;
	case TUNE_STATUS_STREAM_TUNED:
		*status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC |
			  FE_HAS_LOCK | FE_HAS_VITERBI;
		break;
	default:
		*status = TUNE_STATUS_NOT_TUNED;
	}

	pr_debug("as102: tuner status: 0x%02x, strength %d, per: %d, ber: %d\n",
		 tstate.tune_state, tstate.signal_strength,
		 tstate.PER, tstate.BER);

	if (!(*status & FE_HAS_LOCK)) {
		memset(&state->demod_stats, 0, sizeof(state->demod_stats));
		return 0;
	}

	ret = state->ops->get_stats(state->priv, &state->demod_stats);
	if (ret < 0)
		memset(&state->demod_stats, 0, sizeof(state->demod_stats));

	return ret;
}

/*
 * Note:
 * - in AS102 SNR=MER
 *   - the SNR will be returned in linear terms, i.e. not in dB
 *   - the accuracy equals ±2dB for a SNR range from 4dB to 30dB
 *   - the accuracy is >2dB for SNR values outside this range
 */
static int as102_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct as102_state *state = fe->demodulator_priv;

	*snr = state->demod_stats.mer;

	return 0;
}

static int as102_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	struct as102_state *state = fe->demodulator_priv;

	*ber = state->ber;

	return 0;
}

static int as102_fe_read_signal_strength(struct dvb_frontend *fe,
					 u16 *strength)
{
	struct as102_state *state = fe->demodulator_priv;

	*strength = (((0xffff * 400) * state->signal_strength + 41000) * 2);

	return 0;
}

static int as102_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
	struct as102_state *state = fe->demodulator_priv;

	if (state->demod_stats.has_started)
		*ucblocks = state->demod_stats.bad_frame_count;
	else
		*ucblocks = 0;

	return 0;
}

static int as102_fe_ts_bus_ctrl(struct dvb_frontend *fe, int acquire)
{
	struct as102_state *state = fe->demodulator_priv;

	return state->ops->stream_ctrl(state->priv, acquire,
				      state->elna_cfg);
}

static void as102_fe_release(struct dvb_frontend *fe)
{
	struct as102_state *state = fe->demodulator_priv;

	kfree(state);
}


static struct dvb_frontend_ops as102_fe_ops = {
	.delsys = { SYS_DVBT },
	.info = {
		.name			= "Abilis AS102 DVB-T",
		.frequency_min		= 174000000,
		.frequency_max		= 862000000,
		.frequency_stepsize	= 166667,
		.caps = FE_CAN_INVERSION_AUTO
			| FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4
			| FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO
			| FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QPSK
			| FE_CAN_QAM_AUTO
			| FE_CAN_TRANSMISSION_MODE_AUTO
			| FE_CAN_GUARD_INTERVAL_AUTO
			| FE_CAN_HIERARCHY_AUTO
			| FE_CAN_RECOVER
			| FE_CAN_MUTE_TS
	},

	.set_frontend		= as102_fe_set_frontend,
	.get_frontend		= as102_fe_get_frontend,
	.get_tune_settings	= as102_fe_get_tune_settings,

	.read_status		= as102_fe_read_status,
	.read_snr		= as102_fe_read_snr,
	.read_ber		= as102_fe_read_ber,
	.read_signal_strength	= as102_fe_read_signal_strength,
	.read_ucblocks		= as102_fe_read_ucblocks,
	.ts_bus_ctrl		= as102_fe_ts_bus_ctrl,
	.release		= as102_fe_release,
};

struct dvb_frontend *as102_attach(const char *name,
				  const struct as102_fe_ops *ops,
				  void *priv,
				  uint8_t elna_cfg)
{
	struct as102_state *state;
	struct dvb_frontend *fe;

	state = kzalloc(sizeof(struct as102_state), GFP_KERNEL);
	if (state == NULL) {
		pr_err("%s: unable to allocate memory for state\n", __func__);
		return NULL;
	}
	fe = &state->frontend;
	fe->demodulator_priv = state;
	state->ops = ops;
	state->priv = priv;
	state->elna_cfg = elna_cfg;

	/* init frontend callback ops */
	memcpy(&fe->ops, &as102_fe_ops, sizeof(struct dvb_frontend_ops));
	strncpy(fe->ops.info.name, name, sizeof(fe->ops.info.name));

	return fe;

}
EXPORT_SYMBOL_GPL(as102_attach);

MODULE_DESCRIPTION("as102-fe");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pierrick Hascoet <pierrick.hascoet@abilis.com>");