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path: root/drivers/media/dvb/dvb-usb/mxl111sf-demod.c
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Diffstat (limited to 'drivers/media/dvb/dvb-usb/mxl111sf-demod.c')
-rw-r--r--drivers/media/dvb/dvb-usb/mxl111sf-demod.c614
1 files changed, 614 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-usb/mxl111sf-demod.c b/drivers/media/dvb/dvb-usb/mxl111sf-demod.c
new file mode 100644
index 000000000000..d1f58371c711
--- /dev/null
+++ b/drivers/media/dvb/dvb-usb/mxl111sf-demod.c
@@ -0,0 +1,614 @@
1/*
2 * mxl111sf-demod.c - driver for the MaxLinear MXL111SF DVB-T demodulator
3 *
4 * Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.com>
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#include "mxl111sf-demod.h"
22#include "mxl111sf-reg.h"
23
24/* debug */
25static int mxl111sf_demod_debug;
26module_param_named(debug, mxl111sf_demod_debug, int, 0644);
27MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
28
29#define mxl_dbg(fmt, arg...) \
30 if (mxl111sf_demod_debug) \
31 mxl_printk(KERN_DEBUG, fmt, ##arg)
32
33/* ------------------------------------------------------------------------ */
34
35struct mxl111sf_demod_state {
36 struct mxl111sf_state *mxl_state;
37
38 struct mxl111sf_demod_config *cfg;
39
40 struct dvb_frontend fe;
41};
42
43/* ------------------------------------------------------------------------ */
44
45static int mxl111sf_demod_read_reg(struct mxl111sf_demod_state *state,
46 u8 addr, u8 *data)
47{
48 return (state->cfg->read_reg) ?
49 state->cfg->read_reg(state->mxl_state, addr, data) :
50 -EINVAL;
51}
52
53static int mxl111sf_demod_write_reg(struct mxl111sf_demod_state *state,
54 u8 addr, u8 data)
55{
56 return (state->cfg->write_reg) ?
57 state->cfg->write_reg(state->mxl_state, addr, data) :
58 -EINVAL;
59}
60
61static
62int mxl111sf_demod_program_regs(struct mxl111sf_demod_state *state,
63 struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
64{
65 return (state->cfg->program_regs) ?
66 state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
67 -EINVAL;
68}
69
70/* ------------------------------------------------------------------------ */
71/* TPS */
72
73static
74int mxl1x1sf_demod_get_tps_code_rate(struct mxl111sf_demod_state *state,
75 fe_code_rate_t *code_rate)
76{
77 u8 val;
78 int ret = mxl111sf_demod_read_reg(state, V6_CODE_RATE_TPS_REG, &val);
79 /* bit<2:0> - 000:1/2, 001:2/3, 010:3/4, 011:5/6, 100:7/8 */
80 if (mxl_fail(ret))
81 goto fail;
82
83 switch (val & V6_CODE_RATE_TPS_MASK) {
84 case 0:
85 *code_rate = FEC_1_2;
86 break;
87 case 1:
88 *code_rate = FEC_2_3;
89 break;
90 case 2:
91 *code_rate = FEC_3_4;
92 break;
93 case 3:
94 *code_rate = FEC_5_6;
95 break;
96 case 4:
97 *code_rate = FEC_7_8;
98 break;
99 }
100fail:
101 return ret;
102}
103
104static
105int mxl1x1sf_demod_get_tps_constellation(struct mxl111sf_demod_state *state,
106 fe_modulation_t *constellation)
107{
108 u8 val;
109 int ret = mxl111sf_demod_read_reg(state, V6_MODORDER_TPS_REG, &val);
110 /* Constellation, 00 : QPSK, 01 : 16QAM, 10:64QAM */
111 if (mxl_fail(ret))
112 goto fail;
113
114 switch ((val & V6_PARAM_CONSTELLATION_MASK) >> 4) {
115 case 0:
116 *constellation = QPSK;
117 break;
118 case 1:
119 *constellation = QAM_16;
120 break;
121 case 2:
122 *constellation = QAM_64;
123 break;
124 }
125fail:
126 return ret;
127}
128
129static
130int mxl1x1sf_demod_get_tps_guard_fft_mode(struct mxl111sf_demod_state *state,
131 fe_transmit_mode_t *fft_mode)
132{
133 u8 val;
134 int ret = mxl111sf_demod_read_reg(state, V6_MODE_TPS_REG, &val);
135 /* FFT Mode, 00:2K, 01:8K, 10:4K */
136 if (mxl_fail(ret))
137 goto fail;
138
139 switch ((val & V6_PARAM_FFT_MODE_MASK) >> 2) {
140 case 0:
141 *fft_mode = TRANSMISSION_MODE_2K;
142 break;
143 case 1:
144 *fft_mode = TRANSMISSION_MODE_8K;
145 break;
146 case 2:
147 *fft_mode = TRANSMISSION_MODE_4K;
148 break;
149 }
150fail:
151 return ret;
152}
153
154static
155int mxl1x1sf_demod_get_tps_guard_interval(struct mxl111sf_demod_state *state,
156 fe_guard_interval_t *guard)
157{
158 u8 val;
159 int ret = mxl111sf_demod_read_reg(state, V6_CP_TPS_REG, &val);
160 /* 00:1/32, 01:1/16, 10:1/8, 11:1/4 */
161 if (mxl_fail(ret))
162 goto fail;
163
164 switch ((val & V6_PARAM_GI_MASK) >> 4) {
165 case 0:
166 *guard = GUARD_INTERVAL_1_32;
167 break;
168 case 1:
169 *guard = GUARD_INTERVAL_1_16;
170 break;
171 case 2:
172 *guard = GUARD_INTERVAL_1_8;
173 break;
174 case 3:
175 *guard = GUARD_INTERVAL_1_4;
176 break;
177 }
178fail:
179 return ret;
180}
181
182static
183int mxl1x1sf_demod_get_tps_hierarchy(struct mxl111sf_demod_state *state,
184 fe_hierarchy_t *hierarchy)
185{
186 u8 val;
187 int ret = mxl111sf_demod_read_reg(state, V6_TPS_HIERACHY_REG, &val);
188 /* bit<6:4> - 000:Non hierarchy, 001:1, 010:2, 011:4 */
189 if (mxl_fail(ret))
190 goto fail;
191
192 switch ((val & V6_TPS_HIERARCHY_INFO_MASK) >> 6) {
193 case 0:
194 *hierarchy = HIERARCHY_NONE;
195 break;
196 case 1:
197 *hierarchy = HIERARCHY_1;
198 break;
199 case 2:
200 *hierarchy = HIERARCHY_2;
201 break;
202 case 3:
203 *hierarchy = HIERARCHY_4;
204 break;
205 }
206fail:
207 return ret;
208}
209
210/* ------------------------------------------------------------------------ */
211/* LOCKS */
212
213static
214int mxl1x1sf_demod_get_sync_lock_status(struct mxl111sf_demod_state *state,
215 int *sync_lock)
216{
217 u8 val = 0;
218 int ret = mxl111sf_demod_read_reg(state, V6_SYNC_LOCK_REG, &val);
219 if (mxl_fail(ret))
220 goto fail;
221 *sync_lock = (val & SYNC_LOCK_MASK) >> 4;
222fail:
223 return ret;
224}
225
226static
227int mxl1x1sf_demod_get_rs_lock_status(struct mxl111sf_demod_state *state,
228 int *rs_lock)
229{
230 u8 val = 0;
231 int ret = mxl111sf_demod_read_reg(state, V6_RS_LOCK_DET_REG, &val);
232 if (mxl_fail(ret))
233 goto fail;
234 *rs_lock = (val & RS_LOCK_DET_MASK) >> 3;
235fail:
236 return ret;
237}
238
239static
240int mxl1x1sf_demod_get_tps_lock_status(struct mxl111sf_demod_state *state,
241 int *tps_lock)
242{
243 u8 val = 0;
244 int ret = mxl111sf_demod_read_reg(state, V6_TPS_LOCK_REG, &val);
245 if (mxl_fail(ret))
246 goto fail;
247 *tps_lock = (val & V6_PARAM_TPS_LOCK_MASK) >> 6;
248fail:
249 return ret;
250}
251
252static
253int mxl1x1sf_demod_get_fec_lock_status(struct mxl111sf_demod_state *state,
254 int *fec_lock)
255{
256 u8 val = 0;
257 int ret = mxl111sf_demod_read_reg(state, V6_IRQ_STATUS_REG, &val);
258 if (mxl_fail(ret))
259 goto fail;
260 *fec_lock = (val & IRQ_MASK_FEC_LOCK) >> 4;
261fail:
262 return ret;
263}
264
265#if 0
266static
267int mxl1x1sf_demod_get_cp_lock_status(struct mxl111sf_demod_state *state,
268 int *cp_lock)
269{
270 u8 val = 0;
271 int ret = mxl111sf_demod_read_reg(state, V6_CP_LOCK_DET_REG, &val);
272 if (mxl_fail(ret))
273 goto fail;
274 *cp_lock = (val & V6_CP_LOCK_DET_MASK) >> 2;
275fail:
276 return ret;
277}
278#endif
279
280static int mxl1x1sf_demod_reset_irq_status(struct mxl111sf_demod_state *state)
281{
282 return mxl111sf_demod_write_reg(state, 0x0e, 0xff);
283}
284
285/* ------------------------------------------------------------------------ */
286
287static int mxl111sf_demod_set_frontend(struct dvb_frontend *fe,
288 struct dvb_frontend_parameters *param)
289{
290 struct mxl111sf_demod_state *state = fe->demodulator_priv;
291 int ret = 0;
292
293 struct mxl111sf_reg_ctrl_info phy_pll_patch[] = {
294 {0x00, 0xff, 0x01}, /* change page to 1 */
295 {0x40, 0xff, 0x05},
296 {0x40, 0xff, 0x01},
297 {0x41, 0xff, 0xca},
298 {0x41, 0xff, 0xc0},
299 {0x00, 0xff, 0x00}, /* change page to 0 */
300 {0, 0, 0}
301 };
302
303 mxl_dbg("()");
304
305 if (fe->ops.tuner_ops.set_params) {
306 ret = fe->ops.tuner_ops.set_params(fe, param);
307 if (mxl_fail(ret))
308 goto fail;
309 msleep(50);
310 }
311 ret = mxl111sf_demod_program_regs(state, phy_pll_patch);
312 mxl_fail(ret);
313 msleep(50);
314 ret = mxl1x1sf_demod_reset_irq_status(state);
315 mxl_fail(ret);
316 msleep(100);
317fail:
318 return ret;
319}
320
321/* ------------------------------------------------------------------------ */
322
323#if 0
324/* resets TS Packet error count */
325/* After setting 7th bit of V5_PER_COUNT_RESET_REG, it should be reset to 0. */
326static
327int mxl1x1sf_demod_reset_packet_error_count(struct mxl111sf_demod_state *state)
328{
329 struct mxl111sf_reg_ctrl_info reset_per_count[] = {
330 {0x20, 0x01, 0x01},
331 {0x20, 0x01, 0x00},
332 {0, 0, 0}
333 };
334 return mxl111sf_demod_program_regs(state, reset_per_count);
335}
336#endif
337
338/* returns TS Packet error count */
339/* PER Count = FEC_PER_COUNT * (2 ** (FEC_PER_SCALE * 4)) */
340static int mxl111sf_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
341{
342 struct mxl111sf_demod_state *state = fe->demodulator_priv;
343 u32 fec_per_count, fec_per_scale;
344 u8 val;
345 int ret;
346
347 *ucblocks = 0;
348
349 /* FEC_PER_COUNT Register */
350 ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_COUNT_REG, &val);
351 if (mxl_fail(ret))
352 goto fail;
353
354 fec_per_count = val;
355
356 /* FEC_PER_SCALE Register */
357 ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_SCALE_REG, &val);
358 if (mxl_fail(ret))
359 goto fail;
360
361 val &= V6_FEC_PER_SCALE_MASK;
362 val *= 4;
363
364 fec_per_scale = 1 << val;
365
366 fec_per_count *= fec_per_scale;
367
368 *ucblocks = fec_per_count;
369fail:
370 return ret;
371}
372
373#ifdef MXL111SF_DEMOD_ENABLE_CALCULATIONS
374/* FIXME: leaving this enabled breaks the build on some architectures,
375 * and we shouldn't have any floating point math in the kernel, anyway.
376 *
377 * These macros need to be re-written, but it's harmless to simply
378 * return zero for now. */
379#define CALCULATE_BER(avg_errors, count) \
380 ((u32)(avg_errors * 4)/(count*64*188*8))
381#define CALCULATE_SNR(data) \
382 ((u32)((10 * (u32)data / 64) - 2.5))
383#else
384#define CALCULATE_BER(avg_errors, count) 0
385#define CALCULATE_SNR(data) 0
386#endif
387
388static int mxl111sf_demod_read_ber(struct dvb_frontend *fe, u32 *ber)
389{
390 struct mxl111sf_demod_state *state = fe->demodulator_priv;
391 u8 val1, val2, val3;
392 int ret;
393
394 *ber = 0;
395
396 ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_LSB_REG, &val1);
397 if (mxl_fail(ret))
398 goto fail;
399 ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_MSB_REG, &val2);
400 if (mxl_fail(ret))
401 goto fail;
402 ret = mxl111sf_demod_read_reg(state, V6_N_ACCUMULATE_REG, &val3);
403 if (mxl_fail(ret))
404 goto fail;
405
406 *ber = CALCULATE_BER((val1 | (val2 << 8)), val3);
407fail:
408 return ret;
409}
410
411static int mxl111sf_demod_calc_snr(struct mxl111sf_demod_state *state,
412 u16 *snr)
413{
414 u8 val1, val2;
415 int ret;
416
417 *snr = 0;
418
419 ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_LSB_REG, &val1);
420 if (mxl_fail(ret))
421 goto fail;
422 ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_MSB_REG, &val2);
423 if (mxl_fail(ret))
424 goto fail;
425
426 *snr = CALCULATE_SNR(val1 | ((val2 & 0x03) << 8));
427fail:
428 return ret;
429}
430
431static int mxl111sf_demod_read_snr(struct dvb_frontend *fe, u16 *snr)
432{
433 struct mxl111sf_demod_state *state = fe->demodulator_priv;
434
435 int ret = mxl111sf_demod_calc_snr(state, snr);
436 if (mxl_fail(ret))
437 goto fail;
438
439 *snr /= 10; /* 0.1 dB */
440fail:
441 return ret;
442}
443
444static int mxl111sf_demod_read_status(struct dvb_frontend *fe,
445 fe_status_t *status)
446{
447 struct mxl111sf_demod_state *state = fe->demodulator_priv;
448 int ret, locked, cr_lock, sync_lock, fec_lock;
449
450 *status = 0;
451
452 ret = mxl1x1sf_demod_get_rs_lock_status(state, &locked);
453 if (mxl_fail(ret))
454 goto fail;
455 ret = mxl1x1sf_demod_get_tps_lock_status(state, &cr_lock);
456 if (mxl_fail(ret))
457 goto fail;
458 ret = mxl1x1sf_demod_get_sync_lock_status(state, &sync_lock);
459 if (mxl_fail(ret))
460 goto fail;
461 ret = mxl1x1sf_demod_get_fec_lock_status(state, &fec_lock);
462 if (mxl_fail(ret))
463 goto fail;
464
465 if (locked)
466 *status |= FE_HAS_SIGNAL;
467 if (cr_lock)
468 *status |= FE_HAS_CARRIER;
469 if (sync_lock)
470 *status |= FE_HAS_SYNC;
471 if (fec_lock) /* false positives? */
472 *status |= FE_HAS_VITERBI;
473
474 if ((locked) && (cr_lock) && (sync_lock))
475 *status |= FE_HAS_LOCK;
476fail:
477 return ret;
478}
479
480static int mxl111sf_demod_read_signal_strength(struct dvb_frontend *fe,
481 u16 *signal_strength)
482{
483 struct mxl111sf_demod_state *state = fe->demodulator_priv;
484 fe_modulation_t constellation;
485 u16 snr;
486
487 mxl111sf_demod_calc_snr(state, &snr);
488 mxl1x1sf_demod_get_tps_constellation(state, &constellation);
489
490 switch (constellation) {
491 case QPSK:
492 *signal_strength = (snr >= 1300) ?
493 min(65535, snr * 44) : snr * 38;
494 break;
495 case QAM_16:
496 *signal_strength = (snr >= 1500) ?
497 min(65535, snr * 38) : snr * 33;
498 break;
499 case QAM_64:
500 *signal_strength = (snr >= 2000) ?
501 min(65535, snr * 29) : snr * 25;
502 break;
503 default:
504 *signal_strength = 0;
505 return -EINVAL;
506 }
507
508 return 0;
509}
510
511static int mxl111sf_demod_get_frontend(struct dvb_frontend *fe,
512 struct dvb_frontend_parameters *p)
513{
514 struct mxl111sf_demod_state *state = fe->demodulator_priv;
515
516 mxl_dbg("()");
517#if 0
518 p->inversion = /* FIXME */ ? INVERSION_ON : INVERSION_OFF;
519#endif
520 if (fe->ops.tuner_ops.get_bandwidth)
521 fe->ops.tuner_ops.get_bandwidth(fe, &p->u.ofdm.bandwidth);
522 if (fe->ops.tuner_ops.get_frequency)
523 fe->ops.tuner_ops.get_frequency(fe, &p->frequency);
524 mxl1x1sf_demod_get_tps_code_rate(state, &p->u.ofdm.code_rate_HP);
525 mxl1x1sf_demod_get_tps_code_rate(state, &p->u.ofdm.code_rate_LP);
526 mxl1x1sf_demod_get_tps_constellation(state, &p->u.ofdm.constellation);
527 mxl1x1sf_demod_get_tps_guard_fft_mode(state,
528 &p->u.ofdm.transmission_mode);
529 mxl1x1sf_demod_get_tps_guard_interval(state,
530 &p->u.ofdm.guard_interval);
531 mxl1x1sf_demod_get_tps_hierarchy(state,
532 &p->u.ofdm.hierarchy_information);
533
534 return 0;
535}
536
537static
538int mxl111sf_demod_get_tune_settings(struct dvb_frontend *fe,
539 struct dvb_frontend_tune_settings *tune)
540{
541 tune->min_delay_ms = 1000;
542 return 0;
543}
544
545static void mxl111sf_demod_release(struct dvb_frontend *fe)
546{
547 struct mxl111sf_demod_state *state = fe->demodulator_priv;
548 mxl_dbg("()");
549 kfree(state);
550 fe->demodulator_priv = NULL;
551}
552
553static struct dvb_frontend_ops mxl111sf_demod_ops = {
554
555 .info = {
556 .name = "MaxLinear MxL111SF DVB-T demodulator",
557 .type = FE_OFDM,
558 .frequency_min = 177000000,
559 .frequency_max = 858000000,
560 .frequency_stepsize = 166666,
561 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
562 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
563 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
564 FE_CAN_QAM_AUTO |
565 FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
566 FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
567 },
568 .release = mxl111sf_demod_release,
569#if 0
570 .init = mxl111sf_init,
571 .i2c_gate_ctrl = mxl111sf_i2c_gate_ctrl,
572#endif
573 .set_frontend = mxl111sf_demod_set_frontend,
574 .get_frontend = mxl111sf_demod_get_frontend,
575 .get_tune_settings = mxl111sf_demod_get_tune_settings,
576 .read_status = mxl111sf_demod_read_status,
577 .read_signal_strength = mxl111sf_demod_read_signal_strength,
578 .read_ber = mxl111sf_demod_read_ber,
579 .read_snr = mxl111sf_demod_read_snr,
580 .read_ucblocks = mxl111sf_demod_read_ucblocks,
581};
582
583struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
584 struct mxl111sf_demod_config *cfg)
585{
586 struct mxl111sf_demod_state *state = NULL;
587
588 mxl_dbg("()");
589
590 state = kzalloc(sizeof(struct mxl111sf_demod_state), GFP_KERNEL);
591 if (state == NULL)
592 return NULL;
593
594 state->mxl_state = mxl_state;
595 state->cfg = cfg;
596
597 memcpy(&state->fe.ops, &mxl111sf_demod_ops,
598 sizeof(struct dvb_frontend_ops));
599
600 state->fe.demodulator_priv = state;
601 return &state->fe;
602}
603EXPORT_SYMBOL_GPL(mxl111sf_demod_attach);
604
605MODULE_DESCRIPTION("MaxLinear MxL111SF DVB-T demodulator driver");
606MODULE_AUTHOR("Michael Krufky <mkrufky@kernellabs.com>");
607MODULE_LICENSE("GPL");
608MODULE_VERSION("0.1");
609
610/*
611 * Local variables:
612 * c-basic-offset: 8
613 * End:
614 */
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-10 04:16:47 -0500