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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / staging / pi433 / rf69.c
blob7d86bb8be24535a99763b6bd50de1d3c7d67d5eb
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * abstraction of the spi interface of HopeRf rf69 radio module
4 *
5 * Copyright (C) 2016 Wolf-Entwicklungen
6 * Marcus Wolf <linux@wolf-entwicklungen.de>
7 */
8
9 /* enable prosa debug info */
10 #undef DEBUG
11 /* enable print of values on reg access */
12 #undef DEBUG_VALUES
13 /* enable print of values on fifo access */
14 #undef DEBUG_FIFO_ACCESS
15
16 #include <linux/types.h>
17 #include <linux/spi/spi.h>
18
19 #include "rf69.h"
20 #include "rf69_registers.h"
21
22 #define F_OSC 32000000 /* in Hz */
23 #define FIFO_SIZE 66 /* in byte */
24
25 /*-------------------------------------------------------------------------*/
26
27 static u8 rf69_read_reg(struct spi_device *spi, u8 addr)
28 {
29 int retval;
30
31 retval = spi_w8r8(spi, addr);
32
33 #ifdef DEBUG_VALUES
34 if (retval < 0)
35 /*
36 * should never happen, since we already checked,
37 * that module is connected. Therefore no error
38 * handling, just an optional error message...
39 */
40 dev_dbg(&spi->dev, "read 0x%x FAILED\n", addr);
41 else
42 dev_dbg(&spi->dev, "read 0x%x from reg 0x%x\n", retval, addr);
43 #endif
44
45 return retval;
46 }
47
48 static int rf69_write_reg(struct spi_device *spi, u8 addr, u8 value)
49 {
50 int retval;
51 char buffer[2];
52
53 buffer[0] = addr | WRITE_BIT;
54 buffer[1] = value;
55
56 retval = spi_write(spi, &buffer, 2);
57
58 #ifdef DEBUG_VALUES
59 if (retval < 0)
60 /*
61 * should never happen, since we already checked,
62 * that module is connected. Therefore no error
63 * handling, just an optional error message...
64 */
65 dev_dbg(&spi->dev, "write 0x%x to 0x%x FAILED\n", value, addr);
66 else
67 dev_dbg(&spi->dev, "wrote 0x%x to reg 0x%x\n", value, addr);
68 #endif
69
70 return retval;
71 }
72
73 /*-------------------------------------------------------------------------*/
74
75 static int rf69_set_bit(struct spi_device *spi, u8 reg, u8 mask)
76 {
77 u8 tmp;
78
79 tmp = rf69_read_reg(spi, reg);
80 tmp = tmp | mask;
81 return rf69_write_reg(spi, reg, tmp);
82 }
83
84 static int rf69_clear_bit(struct spi_device *spi, u8 reg, u8 mask)
85 {
86 u8 tmp;
87
88 tmp = rf69_read_reg(spi, reg);
89 tmp = tmp & ~mask;
90 return rf69_write_reg(spi, reg, tmp);
91 }
92
93 static inline int rf69_read_mod_write(struct spi_device *spi, u8 reg,
94 u8 mask, u8 value)
95 {
96 u8 tmp;
97
98 tmp = rf69_read_reg(spi, reg);
99 tmp = (tmp & ~mask) | value;
100 return rf69_write_reg(spi, reg, tmp);
101 }
102
103 /*-------------------------------------------------------------------------*/
104
105 int rf69_set_mode(struct spi_device *spi, enum mode mode)
106 {
107 static const u8 mode_map[] = {
108 [transmit] = OPMODE_MODE_TRANSMIT,
109 [receive] = OPMODE_MODE_RECEIVE,
110 [synthesizer] = OPMODE_MODE_SYNTHESIZER,
111 [standby] = OPMODE_MODE_STANDBY,
112 [mode_sleep] = OPMODE_MODE_SLEEP,
113 };
114
115 if (unlikely(mode >= ARRAY_SIZE(mode_map))) {
116 dev_dbg(&spi->dev, "set: illegal input param");
117 return -EINVAL;
118 }
119
120 return rf69_read_mod_write(spi, REG_OPMODE, MASK_OPMODE_MODE,
121 mode_map[mode]);
122
123 /*
124 * we are using packet mode, so this check is not really needed
125 * but waiting for mode ready is necessary when going from sleep
126 * because the FIFO may not be immediately available from previous mode
127 * while (_mode == RF69_MODE_SLEEP && (READ_REG(REG_IRQFLAGS1) &
128 RF_IRQFLAGS1_MODEREADY) == 0x00); // Wait for ModeReady
129 */
130 }
131
132 int rf69_set_data_mode(struct spi_device *spi, u8 data_mode)
133 {
134 return rf69_read_mod_write(spi, REG_DATAMODUL, MASK_DATAMODUL_MODE,
135 data_mode);
136 }
137
138 int rf69_set_modulation(struct spi_device *spi, enum modulation modulation)
139 {
140 static const u8 modulation_map[] = {
141 [OOK] = DATAMODUL_MODULATION_TYPE_OOK,
142 [FSK] = DATAMODUL_MODULATION_TYPE_FSK,
143 };
144
145 if (unlikely(modulation >= ARRAY_SIZE(modulation_map))) {
146 dev_dbg(&spi->dev, "set: illegal input param");
147 return -EINVAL;
148 }
149
150 return rf69_read_mod_write(spi, REG_DATAMODUL,
151 MASK_DATAMODUL_MODULATION_TYPE,
152 modulation_map[modulation]);
153 }
154
155 static enum modulation rf69_get_modulation(struct spi_device *spi)
156 {
157 u8 modulation_reg;
158
159 modulation_reg = rf69_read_reg(spi, REG_DATAMODUL);
160
161 switch (modulation_reg & MASK_DATAMODUL_MODULATION_TYPE) {
162 case DATAMODUL_MODULATION_TYPE_OOK:
163 return OOK;
164 case DATAMODUL_MODULATION_TYPE_FSK:
165 return FSK;
166 default:
167 return UNDEF;
168 }
169 }
170
171 int rf69_set_modulation_shaping(struct spi_device *spi,
172 enum mod_shaping mod_shaping)
173 {
174 switch (rf69_get_modulation(spi)) {
175 case FSK:
176 switch (mod_shaping) {
177 case SHAPING_OFF:
178 return rf69_read_mod_write(spi, REG_DATAMODUL,
179 MASK_DATAMODUL_MODULATION_SHAPE,
180 DATAMODUL_MODULATION_SHAPE_NONE);
181 case SHAPING_1_0:
182 return rf69_read_mod_write(spi, REG_DATAMODUL,
183 MASK_DATAMODUL_MODULATION_SHAPE,
184 DATAMODUL_MODULATION_SHAPE_1_0);
185 case SHAPING_0_5:
186 return rf69_read_mod_write(spi, REG_DATAMODUL,
187 MASK_DATAMODUL_MODULATION_SHAPE,
188 DATAMODUL_MODULATION_SHAPE_0_5);
189 case SHAPING_0_3:
190 return rf69_read_mod_write(spi, REG_DATAMODUL,
191 MASK_DATAMODUL_MODULATION_SHAPE,
192 DATAMODUL_MODULATION_SHAPE_0_3);
193 default:
194 dev_dbg(&spi->dev, "set: illegal input param");
195 return -EINVAL;
196 }
197 case OOK:
198 switch (mod_shaping) {
199 case SHAPING_OFF:
200 return rf69_read_mod_write(spi, REG_DATAMODUL,
201 MASK_DATAMODUL_MODULATION_SHAPE,
202 DATAMODUL_MODULATION_SHAPE_NONE);
203 case SHAPING_BR:
204 return rf69_read_mod_write(spi, REG_DATAMODUL,
205 MASK_DATAMODUL_MODULATION_SHAPE,
206 DATAMODUL_MODULATION_SHAPE_BR);
207 case SHAPING_2BR:
208 return rf69_read_mod_write(spi, REG_DATAMODUL,
209 MASK_DATAMODUL_MODULATION_SHAPE,
210 DATAMODUL_MODULATION_SHAPE_2BR);
211 default:
212 dev_dbg(&spi->dev, "set: illegal input param");
213 return -EINVAL;
214 }
215 default:
216 dev_dbg(&spi->dev, "set: modulation undefined");
217 return -EINVAL;
218 }
219 }
220
221 int rf69_set_bit_rate(struct spi_device *spi, u16 bit_rate)
222 {
223 int retval;
224 u32 bit_rate_min;
225 u32 bit_rate_reg;
226 u8 msb;
227 u8 lsb;
228
229 // check input value
230 bit_rate_min = F_OSC / 8388608; // 8388608 = 2^23;
231 if (bit_rate < bit_rate_min) {
232 dev_dbg(&spi->dev, "setBitRate: illegal input param");
233 return -EINVAL;
234 }
235
236 // calculate reg settings
237 bit_rate_reg = (F_OSC / bit_rate);
238
239 msb = (bit_rate_reg & 0xff00) >> 8;
240 lsb = (bit_rate_reg & 0xff);
241
242 // transmit to RF 69
243 retval = rf69_write_reg(spi, REG_BITRATE_MSB, msb);
244 if (retval)
245 return retval;
246 retval = rf69_write_reg(spi, REG_BITRATE_LSB, lsb);
247 if (retval)
248 return retval;
249
250 return 0;
251 }
252
253 int rf69_set_deviation(struct spi_device *spi, u32 deviation)
254 {
255 int retval;
256 u64 f_reg;
257 u64 f_step;
258 u8 msb;
259 u8 lsb;
260 u64 factor = 1000000; // to improve precision of calculation
261
262 // TODO: Dependency to bitrate
263 if (deviation < 600 || deviation > 500000) {
264 dev_dbg(&spi->dev, "set_deviation: illegal input param");
265 return -EINVAL;
266 }
267
268 // calculat f step
269 f_step = F_OSC * factor;
270 do_div(f_step, 524288); // 524288 = 2^19
271
272 // calculate register settings
273 f_reg = deviation * factor;
274 do_div(f_reg, f_step);
275
276 msb = (f_reg & 0xff00) >> 8;
277 lsb = (f_reg & 0xff);
278
279 // check msb
280 if (msb & ~FDEVMASB_MASK) {
281 dev_dbg(&spi->dev, "set_deviation: err in calc of msb");
282 return -EINVAL;
283 }
284
285 // write to chip
286 retval = rf69_write_reg(spi, REG_FDEV_MSB, msb);
287 if (retval)
288 return retval;
289 retval = rf69_write_reg(spi, REG_FDEV_LSB, lsb);
290 if (retval)
291 return retval;
292
293 return 0;
294 }
295
296 int rf69_set_frequency(struct spi_device *spi, u32 frequency)
297 {
298 int retval;
299 u32 f_max;
300 u64 f_reg;
301 u64 f_step;
302 u8 msb;
303 u8 mid;
304 u8 lsb;
305 u64 factor = 1000000; // to improve precision of calculation
306
307 // calculat f step
308 f_step = F_OSC * factor;
309 do_div(f_step, 524288); // 524288 = 2^19
310
311 // check input value
312 f_max = div_u64(f_step * 8388608, factor);
313 if (frequency > f_max) {
314 dev_dbg(&spi->dev, "setFrequency: illegal input param");
315 return -EINVAL;
316 }
317
318 // calculate reg settings
319 f_reg = frequency * factor;
320 do_div(f_reg, f_step);
321
322 msb = (f_reg & 0xff0000) >> 16;
323 mid = (f_reg & 0xff00) >> 8;
324 lsb = (f_reg & 0xff);
325
326 // write to chip
327 retval = rf69_write_reg(spi, REG_FRF_MSB, msb);
328 if (retval)
329 return retval;
330 retval = rf69_write_reg(spi, REG_FRF_MID, mid);
331 if (retval)
332 return retval;
333 retval = rf69_write_reg(spi, REG_FRF_LSB, lsb);
334 if (retval)
335 return retval;
336
337 return 0;
338 }
339
340 int rf69_enable_amplifier(struct spi_device *spi, u8 amplifier_mask)
341 {
342 return rf69_set_bit(spi, REG_PALEVEL, amplifier_mask);
343 }
344
345 int rf69_disable_amplifier(struct spi_device *spi, u8 amplifier_mask)
346 {
347 return rf69_clear_bit(spi, REG_PALEVEL, amplifier_mask);
348 }
349
350 int rf69_set_output_power_level(struct spi_device *spi, u8 power_level)
351 {
352 u8 pa_level, ocp, test_pa1, test_pa2;
353 bool pa0, pa1, pa2, high_power;
354 u8 min_power_level;
355
356 // check register pa_level
357 pa_level = rf69_read_reg(spi, REG_PALEVEL);
358 pa0 = pa_level & MASK_PALEVEL_PA0;
359 pa1 = pa_level & MASK_PALEVEL_PA1;
360 pa2 = pa_level & MASK_PALEVEL_PA2;
361
362 // check high power mode
363 ocp = rf69_read_reg(spi, REG_OCP);
364 test_pa1 = rf69_read_reg(spi, REG_TESTPA1);
365 test_pa2 = rf69_read_reg(spi, REG_TESTPA2);
366 high_power = (ocp == 0x0f) && (test_pa1 == 0x5d) && (test_pa2 == 0x7c);
367
368 if (pa0 && !pa1 && !pa2) {
369 power_level += 18;
370 min_power_level = 0;
371 } else if (!pa0 && pa1 && !pa2) {
372 power_level += 18;
373 min_power_level = 16;
374 } else if (!pa0 && pa1 && pa2) {
375 if (high_power)
376 power_level += 11;
377 else
378 power_level += 14;
379 min_power_level = 16;
380 } else {
381 goto failed;
382 }
383
384 // check input value
385 if (power_level > 0x1f)
386 goto failed;
387
388 if (power_level < min_power_level)
389 goto failed;
390
391 // write value
392 return rf69_read_mod_write(spi, REG_PALEVEL, MASK_PALEVEL_OUTPUT_POWER,
393 power_level);
394 failed:
395 dev_dbg(&spi->dev, "set: illegal input param");
396 return -EINVAL;
397 }
398
399 int rf69_set_pa_ramp(struct spi_device *spi, enum pa_ramp pa_ramp)
400 {
401 static const u8 pa_ramp_map[] = {
402 [ramp3400] = PARAMP_3400,
403 [ramp2000] = PARAMP_2000,
404 [ramp1000] = PARAMP_1000,
405 [ramp500] = PARAMP_500,
406 [ramp250] = PARAMP_250,
407 [ramp125] = PARAMP_125,
408 [ramp100] = PARAMP_100,
409 [ramp62] = PARAMP_62,
410 [ramp50] = PARAMP_50,
411 [ramp40] = PARAMP_40,
412 [ramp31] = PARAMP_31,
413 [ramp25] = PARAMP_25,
414 [ramp20] = PARAMP_20,
415 [ramp15] = PARAMP_15,
416 [ramp10] = PARAMP_10,
417 };
418
419 if (unlikely(pa_ramp >= ARRAY_SIZE(pa_ramp_map))) {
420 dev_dbg(&spi->dev, "set: illegal input param");
421 return -EINVAL;
422 }
423
424 return rf69_write_reg(spi, REG_PARAMP, pa_ramp_map[pa_ramp]);
425 }
426
427 int rf69_set_antenna_impedance(struct spi_device *spi,
428 enum antenna_impedance antenna_impedance)
429 {
430 switch (antenna_impedance) {
431 case fifty_ohm:
432 return rf69_clear_bit(spi, REG_LNA, MASK_LNA_ZIN);
433 case two_hundred_ohm:
434 return rf69_set_bit(spi, REG_LNA, MASK_LNA_ZIN);
435 default:
436 dev_dbg(&spi->dev, "set: illegal input param");
437 return -EINVAL;
438 }
439 }
440
441 int rf69_set_lna_gain(struct spi_device *spi, enum lna_gain lna_gain)
442 {
443 static const u8 lna_gain_map[] = {
444 [automatic] = LNA_GAIN_AUTO,
445 [max] = LNA_GAIN_MAX,
446 [max_minus_6] = LNA_GAIN_MAX_MINUS_6,
447 [max_minus_12] = LNA_GAIN_MAX_MINUS_12,
448 [max_minus_24] = LNA_GAIN_MAX_MINUS_24,
449 [max_minus_36] = LNA_GAIN_MAX_MINUS_36,
450 [max_minus_48] = LNA_GAIN_MAX_MINUS_48,
451 };
452
453 if (unlikely(lna_gain >= ARRAY_SIZE(lna_gain_map))) {
454 dev_dbg(&spi->dev, "set: illegal input param");
455 return -EINVAL;
456 }
457
458 return rf69_read_mod_write(spi, REG_LNA, MASK_LNA_GAIN,
459 lna_gain_map[lna_gain]);
460 }
461
462 static int rf69_set_bandwidth_intern(struct spi_device *spi, u8 reg,
463 enum mantisse mantisse, u8 exponent)
464 {
465 u8 bandwidth;
466
467 // check value for mantisse and exponent
468 if (exponent > 7) {
469 dev_dbg(&spi->dev, "set: illegal input param");
470 return -EINVAL;
471 }
472
473 if ((mantisse != mantisse16) &&
474 (mantisse != mantisse20) &&
475 (mantisse != mantisse24)) {
476 dev_dbg(&spi->dev, "set: illegal input param");
477 return -EINVAL;
478 }
479
480 // read old value
481 bandwidth = rf69_read_reg(spi, reg);
482
483 // "delete" mantisse and exponent = just keep the DCC setting
484 bandwidth = bandwidth & MASK_BW_DCC_FREQ;
485
486 // add new mantisse
487 switch (mantisse) {
488 case mantisse16:
489 bandwidth = bandwidth | BW_MANT_16;
490 break;
491 case mantisse20:
492 bandwidth = bandwidth | BW_MANT_20;
493 break;
494 case mantisse24:
495 bandwidth = bandwidth | BW_MANT_24;
496 break;
497 }
498
499 // add new exponent
500 bandwidth = bandwidth | exponent;
501
502 // write back
503 return rf69_write_reg(spi, reg, bandwidth);
504 }
505
506 int rf69_set_bandwidth(struct spi_device *spi, enum mantisse mantisse,
507 u8 exponent)
508 {
509 return rf69_set_bandwidth_intern(spi, REG_RXBW, mantisse, exponent);
510 }
511
512 int rf69_set_bandwidth_during_afc(struct spi_device *spi,
513 enum mantisse mantisse,
514 u8 exponent)
515 {
516 return rf69_set_bandwidth_intern(spi, REG_AFCBW, mantisse, exponent);
517 }
518
519 int rf69_set_ook_threshold_dec(struct spi_device *spi,
520 enum threshold_decrement threshold_decrement)
521 {
522 static const u8 td_map[] = {
523 [dec_every8th] = OOKPEAK_THRESHDEC_EVERY_8TH,
524 [dec_every4th] = OOKPEAK_THRESHDEC_EVERY_4TH,
525 [dec_every2nd] = OOKPEAK_THRESHDEC_EVERY_2ND,
526 [dec_once] = OOKPEAK_THRESHDEC_ONCE,
527 [dec_twice] = OOKPEAK_THRESHDEC_TWICE,
528 [dec_4times] = OOKPEAK_THRESHDEC_4_TIMES,
529 [dec_8times] = OOKPEAK_THRESHDEC_8_TIMES,
530 [dec_16times] = OOKPEAK_THRESHDEC_16_TIMES,
531 };
532
533 if (unlikely(threshold_decrement >= ARRAY_SIZE(td_map))) {
534 dev_dbg(&spi->dev, "set: illegal input param");
535 return -EINVAL;
536 }
537
538 return rf69_read_mod_write(spi, REG_OOKPEAK, MASK_OOKPEAK_THRESDEC,
539 td_map[threshold_decrement]);
540 }
541
542 int rf69_set_dio_mapping(struct spi_device *spi, u8 dio_number, u8 value)
543 {
544 u8 mask;
545 u8 shift;
546 u8 dio_addr;
547 u8 dio_value;
548
549 switch (dio_number) {
550 case 0:
551 mask = MASK_DIO0;
552 shift = SHIFT_DIO0;
553 dio_addr = REG_DIOMAPPING1;
554 break;
555 case 1:
556 mask = MASK_DIO1;
557 shift = SHIFT_DIO1;
558 dio_addr = REG_DIOMAPPING1;
559 break;
560 case 2:
561 mask = MASK_DIO2;
562 shift = SHIFT_DIO2;
563 dio_addr = REG_DIOMAPPING1;
564 break;
565 case 3:
566 mask = MASK_DIO3;
567 shift = SHIFT_DIO3;
568 dio_addr = REG_DIOMAPPING1;
569 break;
570 case 4:
571 mask = MASK_DIO4;
572 shift = SHIFT_DIO4;
573 dio_addr = REG_DIOMAPPING2;
574 break;
575 case 5:
576 mask = MASK_DIO5;
577 shift = SHIFT_DIO5;
578 dio_addr = REG_DIOMAPPING2;
579 break;
580 default:
581 dev_dbg(&spi->dev, "set: illegal input param");
582 return -EINVAL;
583 }
584
585 // read reg
586 dio_value = rf69_read_reg(spi, dio_addr);
587 // delete old value
588 dio_value = dio_value & ~mask;
589 // add new value
590 dio_value = dio_value | value << shift;
591 // write back
592 return rf69_write_reg(spi, dio_addr, dio_value);
593 }
594
595 bool rf69_get_flag(struct spi_device *spi, enum flag flag)
596 {
597 switch (flag) {
598 case mode_switch_completed:
599 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_MODE_READY);
600 case ready_to_receive:
601 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_RX_READY);
602 case ready_to_send:
603 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_TX_READY);
604 case pll_locked:
605 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_PLL_LOCK);
606 case rssi_exceeded_threshold:
607 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_RSSI);
608 case timeout:
609 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_TIMEOUT);
610 case automode:
611 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_AUTOMODE);
612 case sync_address_match:
613 return (rf69_read_reg(spi, REG_IRQFLAGS1) & MASK_IRQFLAGS1_SYNC_ADDRESS_MATCH);
614 case fifo_full:
615 return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_FIFO_FULL);
616 /*
617 * case fifo_not_empty:
618 * return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_FIFO_NOT_EMPTY);
619 */
620 case fifo_empty:
621 return !(rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_FIFO_NOT_EMPTY);
622 case fifo_level_below_threshold:
623 return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_FIFO_LEVEL);
624 case fifo_overrun:
625 return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_FIFO_OVERRUN);
626 case packet_sent:
627 return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_PACKET_SENT);
628 case payload_ready:
629 return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_PAYLOAD_READY);
630 case crc_ok:
631 return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_CRC_OK);
632 case battery_low:
633 return (rf69_read_reg(spi, REG_IRQFLAGS2) & MASK_IRQFLAGS2_LOW_BAT);
634 default: return false;
635 }
636 }
637
638 int rf69_set_rssi_threshold(struct spi_device *spi, u8 threshold)
639 {
640 /* no value check needed - u8 exactly matches register size */
641
642 return rf69_write_reg(spi, REG_RSSITHRESH, threshold);
643 }
644
645 int rf69_set_preamble_length(struct spi_device *spi, u16 preamble_length)
646 {
647 int retval;
648 u8 msb, lsb;
649
650 /* no value check needed - u16 exactly matches register size */
651
652 /* calculate reg settings */
653 msb = (preamble_length & 0xff00) >> 8;
654 lsb = (preamble_length & 0xff);
655
656 /* transmit to chip */
657 retval = rf69_write_reg(spi, REG_PREAMBLE_MSB, msb);
658 if (retval)
659 return retval;
660 return rf69_write_reg(spi, REG_PREAMBLE_LSB, lsb);
661 }
662
663 int rf69_enable_sync(struct spi_device *spi)
664 {
665 return rf69_set_bit(spi, REG_SYNC_CONFIG, MASK_SYNC_CONFIG_SYNC_ON);
666 }
667
668 int rf69_disable_sync(struct spi_device *spi)
669 {
670 return rf69_clear_bit(spi, REG_SYNC_CONFIG, MASK_SYNC_CONFIG_SYNC_ON);
671 }
672
673 int rf69_set_fifo_fill_condition(struct spi_device *spi,
674 enum fifo_fill_condition fifo_fill_condition)
675 {
676 switch (fifo_fill_condition) {
677 case always:
678 return rf69_set_bit(spi, REG_SYNC_CONFIG,
679 MASK_SYNC_CONFIG_FIFO_FILL_CONDITION);
680 case after_sync_interrupt:
681 return rf69_clear_bit(spi, REG_SYNC_CONFIG,
682 MASK_SYNC_CONFIG_FIFO_FILL_CONDITION);
683 default:
684 dev_dbg(&spi->dev, "set: illegal input param");
685 return -EINVAL;
686 }
687 }
688
689 int rf69_set_sync_size(struct spi_device *spi, u8 sync_size)
690 {
691 // check input value
692 if (sync_size > 0x07) {
693 dev_dbg(&spi->dev, "set: illegal input param");
694 return -EINVAL;
695 }
696
697 // write value
698 return rf69_read_mod_write(spi, REG_SYNC_CONFIG,
699 MASK_SYNC_CONFIG_SYNC_SIZE,
700 (sync_size << 3));
701 }
702
703 int rf69_set_sync_values(struct spi_device *spi, u8 sync_values[8])
704 {
705 int retval = 0;
706
707 retval += rf69_write_reg(spi, REG_SYNCVALUE1, sync_values[0]);
708 retval += rf69_write_reg(spi, REG_SYNCVALUE2, sync_values[1]);
709 retval += rf69_write_reg(spi, REG_SYNCVALUE3, sync_values[2]);
710 retval += rf69_write_reg(spi, REG_SYNCVALUE4, sync_values[3]);
711 retval += rf69_write_reg(spi, REG_SYNCVALUE5, sync_values[4]);
712 retval += rf69_write_reg(spi, REG_SYNCVALUE6, sync_values[5]);
713 retval += rf69_write_reg(spi, REG_SYNCVALUE7, sync_values[6]);
714 retval += rf69_write_reg(spi, REG_SYNCVALUE8, sync_values[7]);
715
716 return retval;
717 }
718
719 int rf69_set_packet_format(struct spi_device *spi,
720 enum packet_format packet_format)
721 {
722 switch (packet_format) {
723 case packet_length_var:
724 return rf69_set_bit(spi, REG_PACKETCONFIG1,
725 MASK_PACKETCONFIG1_PACKET_FORMAT_VARIABLE);
726 case packet_length_fix:
727 return rf69_clear_bit(spi, REG_PACKETCONFIG1,
728 MASK_PACKETCONFIG1_PACKET_FORMAT_VARIABLE);
729 default:
730 dev_dbg(&spi->dev, "set: illegal input param");
731 return -EINVAL;
732 }
733 }
734
735 int rf69_enable_crc(struct spi_device *spi)
736 {
737 return rf69_set_bit(spi, REG_PACKETCONFIG1, MASK_PACKETCONFIG1_CRC_ON);
738 }
739
740 int rf69_disable_crc(struct spi_device *spi)
741 {
742 return rf69_clear_bit(spi, REG_PACKETCONFIG1, MASK_PACKETCONFIG1_CRC_ON);
743 }
744
745 int rf69_set_address_filtering(struct spi_device *spi,
746 enum address_filtering address_filtering)
747 {
748 static const u8 af_map[] = {
749 [filtering_off] = PACKETCONFIG1_ADDRESSFILTERING_OFF,
750 [node_address] = PACKETCONFIG1_ADDRESSFILTERING_NODE,
751 [node_or_broadcast_address] =
752 PACKETCONFIG1_ADDRESSFILTERING_NODEBROADCAST,
753 };
754
755 if (unlikely(address_filtering >= ARRAY_SIZE(af_map))) {
756 dev_dbg(&spi->dev, "set: illegal input param");
757 return -EINVAL;
758 }
759
760 return rf69_read_mod_write(spi, REG_PACKETCONFIG1,
761 MASK_PACKETCONFIG1_ADDRESSFILTERING,
762 af_map[address_filtering]);
763 }
764
765 int rf69_set_payload_length(struct spi_device *spi, u8 payload_length)
766 {
767 return rf69_write_reg(spi, REG_PAYLOAD_LENGTH, payload_length);
768 }
769
770 int rf69_set_node_address(struct spi_device *spi, u8 node_address)
771 {
772 return rf69_write_reg(spi, REG_NODEADRS, node_address);
773 }
774
775 int rf69_set_broadcast_address(struct spi_device *spi, u8 broadcast_address)
776 {
777 return rf69_write_reg(spi, REG_BROADCASTADRS, broadcast_address);
778 }
779
780 int rf69_set_tx_start_condition(struct spi_device *spi,
781 enum tx_start_condition tx_start_condition)
782 {
783 switch (tx_start_condition) {
784 case fifo_level:
785 return rf69_clear_bit(spi, REG_FIFO_THRESH,
786 MASK_FIFO_THRESH_TXSTART);
787 case fifo_not_empty:
788 return rf69_set_bit(spi, REG_FIFO_THRESH,
789 MASK_FIFO_THRESH_TXSTART);
790 default:
791 dev_dbg(&spi->dev, "set: illegal input param");
792 return -EINVAL;
793 }
794 }
795
796 int rf69_set_fifo_threshold(struct spi_device *spi, u8 threshold)
797 {
798 int retval;
799
800 /* check input value */
801 if (threshold & 0x80) {
802 dev_dbg(&spi->dev, "set: illegal input param");
803 return -EINVAL;
804 }
805
806 /* write value */
807 retval = rf69_read_mod_write(spi, REG_FIFO_THRESH,
808 MASK_FIFO_THRESH_VALUE,
809 threshold);
810 if (retval)
811 return retval;
812
813 /*
814 * access the fifo to activate new threshold
815 * retval (mis-) used as buffer here
816 */
817 return rf69_read_fifo(spi, (u8 *)&retval, 1);
818 }
819
820 int rf69_set_dagc(struct spi_device *spi, enum dagc dagc)
821 {
822 static const u8 dagc_map[] = {
823 [normal_mode] = DAGC_NORMAL,
824 [improve] = DAGC_IMPROVED_LOWBETA0,
825 [improve_for_low_modulation_index] = DAGC_IMPROVED_LOWBETA1,
826 };
827
828 if (unlikely(dagc >= ARRAY_SIZE(dagc_map))) {
829 dev_dbg(&spi->dev, "set: illegal input param");
830 return -EINVAL;
831 }
832
833 return rf69_write_reg(spi, REG_TESTDAGC, dagc_map[dagc]);
834 }
835
836 /*-------------------------------------------------------------------------*/
837
838 int rf69_read_fifo(struct spi_device *spi, u8 *buffer, unsigned int size)
839 {
840 #ifdef DEBUG_FIFO_ACCESS
841 int i;
842 #endif
843 struct spi_transfer transfer;
844 u8 local_buffer[FIFO_SIZE + 1];
845 int retval;
846
847 if (size > FIFO_SIZE) {
848 dev_dbg(&spi->dev,
849 "read fifo: passed in buffer bigger then internal buffer\n");
850 return -EMSGSIZE;
851 }
852
853 /* prepare a bidirectional transfer */
854 local_buffer[0] = REG_FIFO;
855 memset(&transfer, 0, sizeof(transfer));
856 transfer.tx_buf = local_buffer;
857 transfer.rx_buf = local_buffer;
858 transfer.len = size + 1;
859
860 retval = spi_sync_transfer(spi, &transfer, 1);
861
862 #ifdef DEBUG_FIFO_ACCESS
863 for (i = 0; i < size; i++)
864 dev_dbg(&spi->dev, "%d - 0x%x\n", i, local_buffer[i + 1]);
865 #endif
866
867 memcpy(buffer, &local_buffer[1], size);
868
869 return retval;
870 }
871
872 int rf69_write_fifo(struct spi_device *spi, u8 *buffer, unsigned int size)
873 {
874 #ifdef DEBUG_FIFO_ACCESS
875 int i;
876 #endif
877 u8 local_buffer[FIFO_SIZE + 1];
878
879 if (size > FIFO_SIZE) {
880 dev_dbg(&spi->dev,
881 "read fifo: passed in buffer bigger then internal buffer\n");
882 return -EMSGSIZE;
883 }
884
885 local_buffer[0] = REG_FIFO | WRITE_BIT;
886 memcpy(&local_buffer[1], buffer, size);
887
888 #ifdef DEBUG_FIFO_ACCESS
889 for (i = 0; i < size; i++)
890 dev_dbg(&spi->dev, "0x%x\n", buffer[i]);
891 #endif
892
893 return spi_write(spi, local_buffer, size + 1);
894 }
895
Linux with added FPC-III support