1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Abilis Systems Single DVB-T Receiver
4 * Copyright (C) 2008 Pierrick Hascoet <pierrick.hascoet@abilis.com>
5 * Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
6 */
7
8 #include <media/dvb_frontend.h>
9
10 #include "as102_fe.h"
11
12 struct as102_state {
13 struct dvb_frontend frontend;
14 struct as10x_demod_stats demod_stats;
15
16 const struct as102_fe_ops *ops;
17 void *priv;
18 uint8_t elna_cfg;
19
20 /* signal strength */
21 uint16_t signal_strength;
22 /* bit error rate */
23 uint32_t ber;
24 };
25
as102_fe_get_code_rate(enum fe_code_rate arg)26 static uint8_t as102_fe_get_code_rate(enum fe_code_rate arg)
27 {
28 uint8_t c;
29
30 switch (arg) {
31 case FEC_1_2:
32 c = CODE_RATE_1_2;
33 break;
34 case FEC_2_3:
35 c = CODE_RATE_2_3;
36 break;
37 case FEC_3_4:
38 c = CODE_RATE_3_4;
39 break;
40 case FEC_5_6:
41 c = CODE_RATE_5_6;
42 break;
43 case FEC_7_8:
44 c = CODE_RATE_7_8;
45 break;
46 default:
47 c = CODE_RATE_UNKNOWN;
48 break;
49 }
50
51 return c;
52 }
53
as102_fe_set_frontend(struct dvb_frontend * fe)54 static int as102_fe_set_frontend(struct dvb_frontend *fe)
55 {
56 struct as102_state *state = fe->demodulator_priv;
57 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
58 struct as10x_tune_args tune_args = { 0 };
59
60 /* set frequency */
61 tune_args.freq = c->frequency / 1000;
62
63 /* fix interleaving_mode */
64 tune_args.interleaving_mode = INTLV_NATIVE;
65
66 switch (c->bandwidth_hz) {
67 case 8000000:
68 tune_args.bandwidth = BW_8_MHZ;
69 break;
70 case 7000000:
71 tune_args.bandwidth = BW_7_MHZ;
72 break;
73 case 6000000:
74 tune_args.bandwidth = BW_6_MHZ;
75 break;
76 default:
77 tune_args.bandwidth = BW_8_MHZ;
78 }
79
80 switch (c->guard_interval) {
81 case GUARD_INTERVAL_1_32:
82 tune_args.guard_interval = GUARD_INT_1_32;
83 break;
84 case GUARD_INTERVAL_1_16:
85 tune_args.guard_interval = GUARD_INT_1_16;
86 break;
87 case GUARD_INTERVAL_1_8:
88 tune_args.guard_interval = GUARD_INT_1_8;
89 break;
90 case GUARD_INTERVAL_1_4:
91 tune_args.guard_interval = GUARD_INT_1_4;
92 break;
93 case GUARD_INTERVAL_AUTO:
94 default:
95 tune_args.guard_interval = GUARD_UNKNOWN;
96 break;
97 }
98
99 switch (c->modulation) {
100 case QPSK:
101 tune_args.modulation = CONST_QPSK;
102 break;
103 case QAM_16:
104 tune_args.modulation = CONST_QAM16;
105 break;
106 case QAM_64:
107 tune_args.modulation = CONST_QAM64;
108 break;
109 default:
110 tune_args.modulation = CONST_UNKNOWN;
111 break;
112 }
113
114 switch (c->transmission_mode) {
115 case TRANSMISSION_MODE_2K:
116 tune_args.transmission_mode = TRANS_MODE_2K;
117 break;
118 case TRANSMISSION_MODE_8K:
119 tune_args.transmission_mode = TRANS_MODE_8K;
120 break;
121 default:
122 tune_args.transmission_mode = TRANS_MODE_UNKNOWN;
123 }
124
125 switch (c->hierarchy) {
126 case HIERARCHY_NONE:
127 tune_args.hierarchy = HIER_NONE;
128 break;
129 case HIERARCHY_1:
130 tune_args.hierarchy = HIER_ALPHA_1;
131 break;
132 case HIERARCHY_2:
133 tune_args.hierarchy = HIER_ALPHA_2;
134 break;
135 case HIERARCHY_4:
136 tune_args.hierarchy = HIER_ALPHA_4;
137 break;
138 case HIERARCHY_AUTO:
139 tune_args.hierarchy = HIER_UNKNOWN;
140 break;
141 }
142
143 pr_debug("as102: tuner parameters: freq: %d bw: 0x%02x gi: 0x%02x\n",
144 c->frequency,
145 tune_args.bandwidth,
146 tune_args.guard_interval);
147
148 /*
149 * Detect a hierarchy selection
150 * if HP/LP are both set to FEC_NONE, HP will be selected.
151 */
152 if ((tune_args.hierarchy != HIER_NONE) &&
153 ((c->code_rate_LP == FEC_NONE) ||
154 (c->code_rate_HP == FEC_NONE))) {
155
156 if (c->code_rate_LP == FEC_NONE) {
157 tune_args.hier_select = HIER_HIGH_PRIORITY;
158 tune_args.code_rate =
159 as102_fe_get_code_rate(c->code_rate_HP);
160 }
161
162 if (c->code_rate_HP == FEC_NONE) {
163 tune_args.hier_select = HIER_LOW_PRIORITY;
164 tune_args.code_rate =
165 as102_fe_get_code_rate(c->code_rate_LP);
166 }
167
168 pr_debug("as102: \thierarchy: 0x%02x selected: %s code_rate_%s: 0x%02x\n",
169 tune_args.hierarchy,
170 tune_args.hier_select == HIER_HIGH_PRIORITY ?
171 "HP" : "LP",
172 tune_args.hier_select == HIER_HIGH_PRIORITY ?
173 "HP" : "LP",
174 tune_args.code_rate);
175 } else {
176 tune_args.code_rate =
177 as102_fe_get_code_rate(c->code_rate_HP);
178 }
179
180 /* Set frontend arguments */
181 return state->ops->set_tune(state->priv, &tune_args);
182 }
183
as102_fe_get_frontend(struct dvb_frontend * fe,struct dtv_frontend_properties * c)184 static int as102_fe_get_frontend(struct dvb_frontend *fe,
185 struct dtv_frontend_properties *c)
186 {
187 struct as102_state *state = fe->demodulator_priv;
188 int ret = 0;
189 struct as10x_tps tps = { 0 };
190
191 /* send abilis command: GET_TPS */
192 ret = state->ops->get_tps(state->priv, &tps);
193 if (ret < 0)
194 return ret;
195
196 /* extract constellation */
197 switch (tps.modulation) {
198 case CONST_QPSK:
199 c->modulation = QPSK;
200 break;
201 case CONST_QAM16:
202 c->modulation = QAM_16;
203 break;
204 case CONST_QAM64:
205 c->modulation = QAM_64;
206 break;
207 }
208
209 /* extract hierarchy */
210 switch (tps.hierarchy) {
211 case HIER_NONE:
212 c->hierarchy = HIERARCHY_NONE;
213 break;
214 case HIER_ALPHA_1:
215 c->hierarchy = HIERARCHY_1;
216 break;
217 case HIER_ALPHA_2:
218 c->hierarchy = HIERARCHY_2;
219 break;
220 case HIER_ALPHA_4:
221 c->hierarchy = HIERARCHY_4;
222 break;
223 }
224
225 /* extract code rate HP */
226 switch (tps.code_rate_HP) {
227 case CODE_RATE_1_2:
228 c->code_rate_HP = FEC_1_2;
229 break;
230 case CODE_RATE_2_3:
231 c->code_rate_HP = FEC_2_3;
232 break;
233 case CODE_RATE_3_4:
234 c->code_rate_HP = FEC_3_4;
235 break;
236 case CODE_RATE_5_6:
237 c->code_rate_HP = FEC_5_6;
238 break;
239 case CODE_RATE_7_8:
240 c->code_rate_HP = FEC_7_8;
241 break;
242 }
243
244 /* extract code rate LP */
245 switch (tps.code_rate_LP) {
246 case CODE_RATE_1_2:
247 c->code_rate_LP = FEC_1_2;
248 break;
249 case CODE_RATE_2_3:
250 c->code_rate_LP = FEC_2_3;
251 break;
252 case CODE_RATE_3_4:
253 c->code_rate_LP = FEC_3_4;
254 break;
255 case CODE_RATE_5_6:
256 c->code_rate_LP = FEC_5_6;
257 break;
258 case CODE_RATE_7_8:
259 c->code_rate_LP = FEC_7_8;
260 break;
261 }
262
263 /* extract guard interval */
264 switch (tps.guard_interval) {
265 case GUARD_INT_1_32:
266 c->guard_interval = GUARD_INTERVAL_1_32;
267 break;
268 case GUARD_INT_1_16:
269 c->guard_interval = GUARD_INTERVAL_1_16;
270 break;
271 case GUARD_INT_1_8:
272 c->guard_interval = GUARD_INTERVAL_1_8;
273 break;
274 case GUARD_INT_1_4:
275 c->guard_interval = GUARD_INTERVAL_1_4;
276 break;
277 }
278
279 /* extract transmission mode */
280 switch (tps.transmission_mode) {
281 case TRANS_MODE_2K:
282 c->transmission_mode = TRANSMISSION_MODE_2K;
283 break;
284 case TRANS_MODE_8K:
285 c->transmission_mode = TRANSMISSION_MODE_8K;
286 break;
287 }
288
289 return 0;
290 }
291
as102_fe_get_tune_settings(struct dvb_frontend * fe,struct dvb_frontend_tune_settings * settings)292 static int as102_fe_get_tune_settings(struct dvb_frontend *fe,
293 struct dvb_frontend_tune_settings *settings)
294 {
295
296 settings->min_delay_ms = 1000;
297
298 return 0;
299 }
300
as102_fe_read_status(struct dvb_frontend * fe,enum fe_status * status)301 static int as102_fe_read_status(struct dvb_frontend *fe, enum fe_status *status)
302 {
303 int ret = 0;
304 struct as102_state *state = fe->demodulator_priv;
305 struct as10x_tune_status tstate = { 0 };
306
307 /* send abilis command: GET_TUNE_STATUS */
308 ret = state->ops->get_status(state->priv, &tstate);
309 if (ret < 0)
310 return ret;
311
312 state->signal_strength = tstate.signal_strength;
313 state->ber = tstate.BER;
314
315 switch (tstate.tune_state) {
316 case TUNE_STATUS_SIGNAL_DVB_OK:
317 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
318 break;
319 case TUNE_STATUS_STREAM_DETECTED:
320 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC |
321 FE_HAS_VITERBI;
322 break;
323 case TUNE_STATUS_STREAM_TUNED:
324 *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_SYNC |
325 FE_HAS_LOCK | FE_HAS_VITERBI;
326 break;
327 default:
328 *status = TUNE_STATUS_NOT_TUNED;
329 }
330
331 pr_debug("as102: tuner status: 0x%02x, strength %d, per: %d, ber: %d\n",
332 tstate.tune_state, tstate.signal_strength,
333 tstate.PER, tstate.BER);
334
335 if (!(*status & FE_HAS_LOCK)) {
336 memset(&state->demod_stats, 0, sizeof(state->demod_stats));
337 return 0;
338 }
339
340 ret = state->ops->get_stats(state->priv, &state->demod_stats);
341 if (ret < 0)
342 memset(&state->demod_stats, 0, sizeof(state->demod_stats));
343
344 return ret;
345 }
346
347 /*
348 * Note:
349 * - in AS102 SNR=MER
350 * - the SNR will be returned in linear terms, i.e. not in dB
351 * - the accuracy equals ±2dB for a SNR range from 4dB to 30dB
352 * - the accuracy is >2dB for SNR values outside this range
353 */
as102_fe_read_snr(struct dvb_frontend * fe,u16 * snr)354 static int as102_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
355 {
356 struct as102_state *state = fe->demodulator_priv;
357
358 *snr = state->demod_stats.mer;
359
360 return 0;
361 }
362
as102_fe_read_ber(struct dvb_frontend * fe,u32 * ber)363 static int as102_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
364 {
365 struct as102_state *state = fe->demodulator_priv;
366
367 *ber = state->ber;
368
369 return 0;
370 }
371
as102_fe_read_signal_strength(struct dvb_frontend * fe,u16 * strength)372 static int as102_fe_read_signal_strength(struct dvb_frontend *fe,
373 u16 *strength)
374 {
375 struct as102_state *state = fe->demodulator_priv;
376
377 *strength = (((0xffff * 400) * state->signal_strength + 41000) * 2);
378
379 return 0;
380 }
381
as102_fe_read_ucblocks(struct dvb_frontend * fe,u32 * ucblocks)382 static int as102_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
383 {
384 struct as102_state *state = fe->demodulator_priv;
385
386 if (state->demod_stats.has_started)
387 *ucblocks = state->demod_stats.bad_frame_count;
388 else
389 *ucblocks = 0;
390
391 return 0;
392 }
393
as102_fe_ts_bus_ctrl(struct dvb_frontend * fe,int acquire)394 static int as102_fe_ts_bus_ctrl(struct dvb_frontend *fe, int acquire)
395 {
396 struct as102_state *state = fe->demodulator_priv;
397
398 return state->ops->stream_ctrl(state->priv, acquire,
399 state->elna_cfg);
400 }
401
as102_fe_release(struct dvb_frontend * fe)402 static void as102_fe_release(struct dvb_frontend *fe)
403 {
404 struct as102_state *state = fe->demodulator_priv;
405
406 kfree(state);
407 }
408
409
410 static const struct dvb_frontend_ops as102_fe_ops = {
411 .delsys = { SYS_DVBT },
412 .info = {
413 .name = "Abilis AS102 DVB-T",
414 .frequency_min_hz = 174 * MHz,
415 .frequency_max_hz = 862 * MHz,
416 .frequency_stepsize_hz = 166667,
417 .caps = FE_CAN_INVERSION_AUTO
418 | FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4
419 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO
420 | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QPSK
421 | FE_CAN_QAM_AUTO
422 | FE_CAN_TRANSMISSION_MODE_AUTO
423 | FE_CAN_GUARD_INTERVAL_AUTO
424 | FE_CAN_HIERARCHY_AUTO
425 | FE_CAN_RECOVER
426 | FE_CAN_MUTE_TS
427 },
428
429 .set_frontend = as102_fe_set_frontend,
430 .get_frontend = as102_fe_get_frontend,
431 .get_tune_settings = as102_fe_get_tune_settings,
432
433 .read_status = as102_fe_read_status,
434 .read_snr = as102_fe_read_snr,
435 .read_ber = as102_fe_read_ber,
436 .read_signal_strength = as102_fe_read_signal_strength,
437 .read_ucblocks = as102_fe_read_ucblocks,
438 .ts_bus_ctrl = as102_fe_ts_bus_ctrl,
439 .release = as102_fe_release,
440 };
441
as102_attach(const char * name,const struct as102_fe_ops * ops,void * priv,uint8_t elna_cfg)442 struct dvb_frontend *as102_attach(const char *name,
443 const struct as102_fe_ops *ops,
444 void *priv,
445 uint8_t elna_cfg)
446 {
447 struct as102_state *state;
448 struct dvb_frontend *fe;
449
450 state = kzalloc(sizeof(*state), GFP_KERNEL);
451 if (!state)
452 return NULL;
453
454 fe = &state->frontend;
455 fe->demodulator_priv = state;
456 state->ops = ops;
457 state->priv = priv;
458 state->elna_cfg = elna_cfg;
459
460 /* init frontend callback ops */
461 memcpy(&fe->ops, &as102_fe_ops, sizeof(struct dvb_frontend_ops));
462 strscpy(fe->ops.info.name, name, sizeof(fe->ops.info.name));
463
464 return fe;
465
466 }
467 EXPORT_SYMBOL_GPL(as102_attach);
468
469 MODULE_DESCRIPTION("as102-fe");
470 MODULE_LICENSE("GPL");
471 MODULE_AUTHOR("Pierrick Hascoet <pierrick.hascoet@abilis.com>");
472