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11#include <linux/errno.h>
12#include <linux/i2c.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/printk.h>
17#include <linux/random.h>
18#include <linux/ratelimit.h>
19#include <linux/slab.h>
20#include <linux/string.h>
21#include <linux/workqueue.h>
22
23#include <media/dvb_frontend.h>
24
25#include "vidtv_demod.h"
26
27#define POLL_THRD_TIME 2000
28
29static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_c_cnr_2_qual[] = {
30
31 { QAM_256, FEC_NONE, 34000, 38000},
32 { QAM_64, FEC_NONE, 30000, 34000},
33};
34
35static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_s_cnr_2_qual[] = {
36
37 { QPSK, FEC_1_2, 7000, 10000},
38 { QPSK, FEC_2_3, 9000, 12000},
39 { QPSK, FEC_3_4, 10000, 13000},
40 { QPSK, FEC_5_6, 11000, 14000},
41 { QPSK, FEC_7_8, 12000, 15000},
42};
43
44static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_s2_cnr_2_qual[] = {
45
46 { QPSK, FEC_1_2, 9000, 12000},
47 { QPSK, FEC_2_3, 11000, 14000},
48 { QPSK, FEC_3_4, 12000, 15000},
49 { QPSK, FEC_5_6, 12000, 15000},
50 { QPSK, FEC_8_9, 13000, 16000},
51 { QPSK, FEC_9_10, 13500, 16500},
52 { PSK_8, FEC_2_3, 14500, 17500},
53 { PSK_8, FEC_3_4, 16000, 19000},
54 { PSK_8, FEC_5_6, 17500, 20500},
55 { PSK_8, FEC_8_9, 19000, 22000},
56};
57
58static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_t_cnr_2_qual[] = {
59
60 { QPSK, FEC_1_2, 4100, 5900},
61 { QPSK, FEC_2_3, 6100, 9600},
62 { QPSK, FEC_3_4, 7200, 12400},
63 { QPSK, FEC_5_6, 8500, 15600},
64 { QPSK, FEC_7_8, 9200, 17500},
65 { QAM_16, FEC_1_2, 9800, 11800},
66 { QAM_16, FEC_2_3, 12100, 15300},
67 { QAM_16, FEC_3_4, 13400, 18100},
68 { QAM_16, FEC_5_6, 14800, 21300},
69 { QAM_16, FEC_7_8, 15700, 23600},
70 { QAM_64, FEC_1_2, 14000, 16000},
71 { QAM_64, FEC_2_3, 19900, 25400},
72 { QAM_64, FEC_3_4, 24900, 27900},
73 { QAM_64, FEC_5_6, 21300, 23300},
74 { QAM_64, FEC_7_8, 22000, 24000},
75};
76
77static const struct vidtv_demod_cnr_to_qual_s *vidtv_match_cnr_s(struct dvb_frontend *fe)
78{
79 const struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL;
80 struct device *dev = fe->dvb->device;
81 struct dtv_frontend_properties *c;
82 u32 array_size = 0;
83 u32 i;
84
85 c = &fe->dtv_property_cache;
86
87 switch (c->delivery_system) {
88 case SYS_DVBT:
89 case SYS_DVBT2:
90 cnr2qual = vidtv_demod_t_cnr_2_qual;
91 array_size = ARRAY_SIZE(vidtv_demod_t_cnr_2_qual);
92 break;
93
94 case SYS_DVBS:
95 cnr2qual = vidtv_demod_s_cnr_2_qual;
96 array_size = ARRAY_SIZE(vidtv_demod_s_cnr_2_qual);
97 break;
98
99 case SYS_DVBS2:
100 cnr2qual = vidtv_demod_s2_cnr_2_qual;
101 array_size = ARRAY_SIZE(vidtv_demod_s2_cnr_2_qual);
102 break;
103
104 case SYS_DVBC_ANNEX_A:
105 cnr2qual = vidtv_demod_c_cnr_2_qual;
106 array_size = ARRAY_SIZE(vidtv_demod_c_cnr_2_qual);
107 break;
108
109 default:
110 dev_warn_ratelimited(dev,
111 "%s: unsupported delivery system: %u\n",
112 __func__,
113 c->delivery_system);
114 break;
115 }
116
117 for (i = 0; i < array_size; i++)
118 if (cnr2qual[i].modulation == c->modulation &&
119 cnr2qual[i].fec == c->fec_inner)
120 return &cnr2qual[i];
121
122 return NULL;
123}
124
125static void vidtv_clean_stats(struct dvb_frontend *fe)
126{
127 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
128
129
130
131
132 c->strength.len = 1;
133 c->strength.stat[0].scale = FE_SCALE_DECIBEL;
134 c->strength.stat[0].svalue = 0;
135
136
137 c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
138 c->cnr.stat[0].svalue = 0;
139 c->cnr.len = 1;
140
141
142 c->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
143 c->pre_bit_error.stat[0].uvalue = 0;
144 c->pre_bit_error.len = 1;
145 c->pre_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
146 c->pre_bit_count.stat[0].uvalue = 0;
147 c->pre_bit_count.len = 1;
148 c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
149 c->post_bit_error.stat[0].uvalue = 0;
150 c->post_bit_error.len = 1;
151 c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
152 c->post_bit_count.stat[0].uvalue = 0;
153 c->post_bit_count.len = 1;
154 c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
155 c->block_error.stat[0].uvalue = 0;
156 c->block_error.len = 1;
157 c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
158 c->block_count.stat[0].uvalue = 0;
159 c->block_count.len = 1;
160}
161
162static void vidtv_demod_update_stats(struct dvb_frontend *fe)
163{
164 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
165 struct vidtv_demod_state *state = fe->demodulator_priv;
166 u32 scale;
167
168 if (state->status & FE_HAS_LOCK) {
169 scale = FE_SCALE_COUNTER;
170 c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
171 } else {
172 scale = FE_SCALE_NOT_AVAILABLE;
173 c->cnr.stat[0].scale = scale;
174 }
175
176 c->pre_bit_error.stat[0].scale = scale;
177 c->pre_bit_count.stat[0].scale = scale;
178 c->post_bit_error.stat[0].scale = scale;
179 c->post_bit_count.stat[0].scale = scale;
180 c->block_error.stat[0].scale = scale;
181 c->block_count.stat[0].scale = scale;
182
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188
189
190 c->strength.stat[0].svalue = state->tuner_cnr;
191 c->strength.stat[0].svalue -= prandom_u32_max(state->tuner_cnr / 50);
192 c->strength.stat[0].svalue -= 68000;
193
194 c->cnr.stat[0].svalue = state->tuner_cnr;
195 c->cnr.stat[0].svalue -= prandom_u32_max(state->tuner_cnr / 50);
196}
197
198static int vidtv_demod_read_status(struct dvb_frontend *fe,
199 enum fe_status *status)
200{
201 struct vidtv_demod_state *state = fe->demodulator_priv;
202 const struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL;
203 struct vidtv_demod_config *config = &state->config;
204 u16 snr = 0;
205
206
207 cnr2qual = vidtv_match_cnr_s(&state->frontend);
208
209 if (cnr2qual && state->tuner_cnr < cnr2qual->cnr_good &&
210 state->frontend.ops.tuner_ops.get_rf_strength) {
211 state->frontend.ops.tuner_ops.get_rf_strength(&state->frontend,
212 &snr);
213
214 if (snr < cnr2qual->cnr_ok) {
215
216 if (prandom_u32_max(100) < config->drop_tslock_prob_on_low_snr)
217 state->status = 0;
218 } else {
219
220 if (prandom_u32_max(100) <
221 config->recover_tslock_prob_on_good_snr)
222 state->status = FE_HAS_SIGNAL |
223 FE_HAS_CARRIER |
224 FE_HAS_VITERBI |
225 FE_HAS_SYNC |
226 FE_HAS_LOCK;
227 }
228 }
229
230 vidtv_demod_update_stats(&state->frontend);
231
232 *status = state->status;
233
234 return 0;
235}
236
237static int vidtv_demod_read_signal_strength(struct dvb_frontend *fe,
238 u16 *strength)
239{
240 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
241
242 *strength = c->strength.stat[0].uvalue;
243
244 return 0;
245}
246
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254
255
256static int vidtv_demod_get_frontend(struct dvb_frontend *fe,
257 struct dtv_frontend_properties *p)
258{
259 return 0;
260}
261
262static int vidtv_demod_set_frontend(struct dvb_frontend *fe)
263{
264 struct vidtv_demod_state *state = fe->demodulator_priv;
265 u32 tuner_status = 0;
266 int ret;
267
268 if (!fe->ops.tuner_ops.set_params)
269 return 0;
270
271 fe->ops.tuner_ops.set_params(fe);
272
273
274 ret = fe->ops.tuner_ops.get_rf_strength(fe, &state->tuner_cnr);
275 if (ret < 0)
276 return ret;
277
278 fe->ops.tuner_ops.get_status(fe, &tuner_status);
279 state->status = (state->tuner_cnr > 0) ? FE_HAS_SIGNAL |
280 FE_HAS_CARRIER |
281 FE_HAS_VITERBI |
282 FE_HAS_SYNC |
283 FE_HAS_LOCK :
284 0;
285
286 vidtv_demod_update_stats(fe);
287
288 if (fe->ops.i2c_gate_ctrl)
289 fe->ops.i2c_gate_ctrl(fe, 0);
290
291 return 0;
292}
293
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299
300
301static int vidtv_demod_set_tone(struct dvb_frontend *fe,
302 enum fe_sec_tone_mode tone)
303{
304 return 0;
305}
306
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312
313
314static int vidtv_demod_set_voltage(struct dvb_frontend *fe,
315 enum fe_sec_voltage voltage)
316{
317 return 0;
318}
319
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325
326
327static int vidtv_send_diseqc_msg(struct dvb_frontend *fe,
328 struct dvb_diseqc_master_cmd *cmd)
329{
330 return 0;
331}
332
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336
337
338
339
340static int vidtv_diseqc_send_burst(struct dvb_frontend *fe,
341 enum fe_sec_mini_cmd burst)
342{
343 return 0;
344}
345
346static void vidtv_demod_release(struct dvb_frontend *fe)
347{
348 struct vidtv_demod_state *state = fe->demodulator_priv;
349
350 kfree(state);
351}
352
353static const struct dvb_frontend_ops vidtv_demod_ops = {
354 .delsys = {
355 SYS_DVBT,
356 SYS_DVBT2,
357 SYS_DVBC_ANNEX_A,
358 SYS_DVBS,
359 SYS_DVBS2,
360 },
361
362 .info = {
363 .name = "Dummy demod for DVB-T/T2/C/S/S2",
364 .frequency_min_hz = 51 * MHz,
365 .frequency_max_hz = 2150 * MHz,
366 .frequency_stepsize_hz = 62500,
367 .frequency_tolerance_hz = 29500 * kHz,
368 .symbol_rate_min = 1000000,
369 .symbol_rate_max = 45000000,
370
371 .caps = FE_CAN_FEC_1_2 |
372 FE_CAN_FEC_2_3 |
373 FE_CAN_FEC_3_4 |
374 FE_CAN_FEC_4_5 |
375 FE_CAN_FEC_5_6 |
376 FE_CAN_FEC_6_7 |
377 FE_CAN_FEC_7_8 |
378 FE_CAN_FEC_8_9 |
379 FE_CAN_QAM_16 |
380 FE_CAN_QAM_64 |
381 FE_CAN_QAM_32 |
382 FE_CAN_QAM_128 |
383 FE_CAN_QAM_256 |
384 FE_CAN_QAM_AUTO |
385 FE_CAN_QPSK |
386 FE_CAN_FEC_AUTO |
387 FE_CAN_INVERSION_AUTO |
388 FE_CAN_TRANSMISSION_MODE_AUTO |
389 FE_CAN_GUARD_INTERVAL_AUTO |
390 FE_CAN_HIERARCHY_AUTO,
391 },
392
393 .release = vidtv_demod_release,
394
395 .set_frontend = vidtv_demod_set_frontend,
396 .get_frontend = vidtv_demod_get_frontend,
397
398 .read_status = vidtv_demod_read_status,
399 .read_signal_strength = vidtv_demod_read_signal_strength,
400
401
402 .set_voltage = vidtv_demod_set_voltage,
403 .set_tone = vidtv_demod_set_tone,
404 .diseqc_send_master_cmd = vidtv_send_diseqc_msg,
405 .diseqc_send_burst = vidtv_diseqc_send_burst,
406
407};
408
409static const struct i2c_device_id vidtv_demod_i2c_id_table[] = {
410 {"dvb_vidtv_demod", 0},
411 {}
412};
413MODULE_DEVICE_TABLE(i2c, vidtv_demod_i2c_id_table);
414
415static int vidtv_demod_i2c_probe(struct i2c_client *client,
416 const struct i2c_device_id *id)
417{
418 struct vidtv_tuner_config *config = client->dev.platform_data;
419 struct vidtv_demod_state *state;
420
421
422 state = kzalloc(sizeof(*state), GFP_KERNEL);
423 if (!state)
424 return -ENOMEM;
425
426
427 memcpy(&state->frontend.ops,
428 &vidtv_demod_ops,
429 sizeof(struct dvb_frontend_ops));
430
431 memcpy(&state->config, config, sizeof(state->config));
432
433 state->frontend.demodulator_priv = state;
434 i2c_set_clientdata(client, state);
435
436 vidtv_clean_stats(&state->frontend);
437
438 return 0;
439}
440
441static int vidtv_demod_i2c_remove(struct i2c_client *client)
442{
443 struct vidtv_demod_state *state = i2c_get_clientdata(client);
444
445 kfree(state);
446
447 return 0;
448}
449
450static struct i2c_driver vidtv_demod_i2c_driver = {
451 .driver = {
452 .name = "dvb_vidtv_demod",
453 .suppress_bind_attrs = true,
454 },
455 .probe = vidtv_demod_i2c_probe,
456 .remove = vidtv_demod_i2c_remove,
457 .id_table = vidtv_demod_i2c_id_table,
458};
459
460module_i2c_driver(vidtv_demod_i2c_driver);
461
462MODULE_DESCRIPTION("Virtual DVB Demodulator Driver");
463MODULE_AUTHOR("Daniel W. S. Almeida");
464MODULE_LICENSE("GPL");
465
