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13#include <linux/interrupt.h>
14#include <linux/fs.h>
15#include <linux/device.h>
16#include <linux/slab.h>
17#include <linux/kernel.h>
18#include <linux/spi/spi.h>
19#include <linux/sysfs.h>
20#include <linux/module.h>
21#include <linux/iio/iio.h>
22#include <linux/iio/sysfs.h>
23#include <linux/iio/events.h>
24#include <linux/iio/buffer.h>
25
26#include "sca3000.h"
27
28enum sca3000_variant {
29 d01,
30 e02,
31 e04,
32 e05,
33};
34
35
36
37
38
39
40
41
42static const struct sca3000_chip_info sca3000_spi_chip_info_tbl[] = {
43 [d01] = {
44 .scale = 7357,
45 .temp_output = true,
46 .measurement_mode_freq = 250,
47 .option_mode_1 = SCA3000_OP_MODE_BYPASS,
48 .option_mode_1_freq = 250,
49 .mot_det_mult_xz = {50, 100, 200, 350, 650, 1300},
50 .mot_det_mult_y = {50, 100, 150, 250, 450, 850, 1750},
51 },
52 [e02] = {
53 .scale = 9810,
54 .measurement_mode_freq = 125,
55 .option_mode_1 = SCA3000_OP_MODE_NARROW,
56 .option_mode_1_freq = 63,
57 .mot_det_mult_xz = {100, 150, 300, 550, 1050, 2050},
58 .mot_det_mult_y = {50, 100, 200, 350, 700, 1350, 2700},
59 },
60 [e04] = {
61 .scale = 19620,
62 .measurement_mode_freq = 100,
63 .option_mode_1 = SCA3000_OP_MODE_NARROW,
64 .option_mode_1_freq = 50,
65 .option_mode_2 = SCA3000_OP_MODE_WIDE,
66 .option_mode_2_freq = 400,
67 .mot_det_mult_xz = {200, 300, 600, 1100, 2100, 4100},
68 .mot_det_mult_y = {100, 200, 400, 7000, 1400, 2700, 54000},
69 },
70 [e05] = {
71 .scale = 61313,
72 .measurement_mode_freq = 200,
73 .option_mode_1 = SCA3000_OP_MODE_NARROW,
74 .option_mode_1_freq = 50,
75 .option_mode_2 = SCA3000_OP_MODE_WIDE,
76 .option_mode_2_freq = 400,
77 .mot_det_mult_xz = {600, 900, 1700, 3200, 6100, 11900},
78 .mot_det_mult_y = {300, 600, 1200, 2000, 4100, 7800, 15600},
79 },
80};
81
82int sca3000_write_reg(struct sca3000_state *st, u8 address, u8 val)
83{
84 st->tx[0] = SCA3000_WRITE_REG(address);
85 st->tx[1] = val;
86 return spi_write(st->us, st->tx, 2);
87}
88
89int sca3000_read_data_short(struct sca3000_state *st,
90 uint8_t reg_address_high,
91 int len)
92{
93 struct spi_transfer xfer[2] = {
94 {
95 .len = 1,
96 .tx_buf = st->tx,
97 }, {
98 .len = len,
99 .rx_buf = st->rx,
100 }
101 };
102 st->tx[0] = SCA3000_READ_REG(reg_address_high);
103
104 return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
105}
106
107
108
109
110
111
112static int sca3000_reg_lock_on(struct sca3000_state *st)
113{
114 int ret;
115
116 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1);
117 if (ret < 0)
118 return ret;
119
120 return !(st->rx[0] & SCA3000_LOCKED);
121}
122
123
124
125
126
127
128
129
130static int __sca3000_unlock_reg_lock(struct sca3000_state *st)
131{
132 struct spi_transfer xfer[3] = {
133 {
134 .len = 2,
135 .cs_change = 1,
136 .tx_buf = st->tx,
137 }, {
138 .len = 2,
139 .cs_change = 1,
140 .tx_buf = st->tx + 2,
141 }, {
142 .len = 2,
143 .tx_buf = st->tx + 4,
144 },
145 };
146 st->tx[0] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
147 st->tx[1] = 0x00;
148 st->tx[2] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
149 st->tx[3] = 0x50;
150 st->tx[4] = SCA3000_WRITE_REG(SCA3000_REG_ADDR_UNLOCK);
151 st->tx[5] = 0xA0;
152
153 return spi_sync_transfer(st->us, xfer, ARRAY_SIZE(xfer));
154}
155
156
157
158
159
160
161
162
163
164
165
166static int sca3000_write_ctrl_reg(struct sca3000_state *st,
167 uint8_t sel,
168 uint8_t val)
169{
170
171 int ret;
172
173 ret = sca3000_reg_lock_on(st);
174 if (ret < 0)
175 goto error_ret;
176 if (ret) {
177 ret = __sca3000_unlock_reg_lock(st);
178 if (ret)
179 goto error_ret;
180 }
181
182
183 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, sel);
184 if (ret)
185 goto error_ret;
186
187
188 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_DATA, val);
189
190error_ret:
191 return ret;
192}
193
194
195
196
197
198
199
200static int sca3000_read_ctrl_reg(struct sca3000_state *st,
201 u8 ctrl_reg)
202{
203 int ret;
204
205 ret = sca3000_reg_lock_on(st);
206 if (ret < 0)
207 goto error_ret;
208 if (ret) {
209 ret = __sca3000_unlock_reg_lock(st);
210 if (ret)
211 goto error_ret;
212 }
213
214 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_CTRL_SEL, ctrl_reg);
215 if (ret)
216 goto error_ret;
217 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_CTRL_DATA, 1);
218 if (ret)
219 goto error_ret;
220 else
221 return st->rx[0];
222error_ret:
223 return ret;
224}
225
226#ifdef SCA3000_DEBUG
227
228
229
230
231
232static int sca3000_check_status(struct device *dev)
233{
234 int ret;
235 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
236 struct sca3000_state *st = iio_priv(indio_dev);
237
238 mutex_lock(&st->lock);
239 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_STATUS, 1);
240 if (ret < 0)
241 goto error_ret;
242 if (st->rx[0] & SCA3000_EEPROM_CS_ERROR)
243 dev_err(dev, "eeprom error\n");
244 if (st->rx[0] & SCA3000_SPI_FRAME_ERROR)
245 dev_err(dev, "Previous SPI Frame was corrupt\n");
246
247error_ret:
248 mutex_unlock(&st->lock);
249 return ret;
250}
251#endif
252
253
254
255
256
257static ssize_t sca3000_show_rev(struct device *dev,
258 struct device_attribute *attr,
259 char *buf)
260{
261 int len = 0, ret;
262 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
263 struct sca3000_state *st = iio_priv(indio_dev);
264
265 mutex_lock(&st->lock);
266 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_REVID, 1);
267 if (ret < 0)
268 goto error_ret;
269 len += sprintf(buf + len,
270 "major=%d, minor=%d\n",
271 st->rx[0] & SCA3000_REVID_MAJOR_MASK,
272 st->rx[0] & SCA3000_REVID_MINOR_MASK);
273error_ret:
274 mutex_unlock(&st->lock);
275
276 return ret ? ret : len;
277}
278
279
280
281
282
283
284
285static ssize_t
286sca3000_show_available_measurement_modes(struct device *dev,
287 struct device_attribute *attr,
288 char *buf)
289{
290 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
291 struct sca3000_state *st = iio_priv(indio_dev);
292 int len = 0;
293
294 len += sprintf(buf + len, "0 - normal mode");
295 switch (st->info->option_mode_1) {
296 case SCA3000_OP_MODE_NARROW:
297 len += sprintf(buf + len, ", 1 - narrow mode");
298 break;
299 case SCA3000_OP_MODE_BYPASS:
300 len += sprintf(buf + len, ", 1 - bypass mode");
301 break;
302 }
303 switch (st->info->option_mode_2) {
304 case SCA3000_OP_MODE_WIDE:
305 len += sprintf(buf + len, ", 2 - wide mode");
306 break;
307 }
308
309 len += sprintf(buf + len, " 3 - motion detection\n");
310
311 return len;
312}
313
314
315
316
317static ssize_t
318sca3000_show_measurement_mode(struct device *dev,
319 struct device_attribute *attr,
320 char *buf)
321{
322 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
323 struct sca3000_state *st = iio_priv(indio_dev);
324 int len = 0, ret;
325
326 mutex_lock(&st->lock);
327 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
328 if (ret)
329 goto error_ret;
330
331 st->rx[0] &= 0x03;
332 switch (st->rx[0]) {
333 case SCA3000_MEAS_MODE_NORMAL:
334 len += sprintf(buf + len, "0 - normal mode\n");
335 break;
336 case SCA3000_MEAS_MODE_MOT_DET:
337 len += sprintf(buf + len, "3 - motion detection\n");
338 break;
339 case SCA3000_MEAS_MODE_OP_1:
340 switch (st->info->option_mode_1) {
341 case SCA3000_OP_MODE_NARROW:
342 len += sprintf(buf + len, "1 - narrow mode\n");
343 break;
344 case SCA3000_OP_MODE_BYPASS:
345 len += sprintf(buf + len, "1 - bypass mode\n");
346 break;
347 }
348 break;
349 case SCA3000_MEAS_MODE_OP_2:
350 switch (st->info->option_mode_2) {
351 case SCA3000_OP_MODE_WIDE:
352 len += sprintf(buf + len, "2 - wide mode\n");
353 break;
354 }
355 break;
356 }
357
358error_ret:
359 mutex_unlock(&st->lock);
360
361 return ret ? ret : len;
362}
363
364
365
366
367static ssize_t
368sca3000_store_measurement_mode(struct device *dev,
369 struct device_attribute *attr,
370 const char *buf,
371 size_t len)
372{
373 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
374 struct sca3000_state *st = iio_priv(indio_dev);
375 int ret;
376 u8 mask = 0x03;
377 u8 val;
378
379 mutex_lock(&st->lock);
380 ret = kstrtou8(buf, 10, &val);
381 if (ret)
382 goto error_ret;
383 if (val > 3) {
384 ret = -EINVAL;
385 goto error_ret;
386 }
387 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
388 if (ret)
389 goto error_ret;
390 st->rx[0] &= ~mask;
391 st->rx[0] |= (val & mask);
392 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE, st->rx[0]);
393 if (ret)
394 goto error_ret;
395 mutex_unlock(&st->lock);
396
397 return len;
398
399error_ret:
400 mutex_unlock(&st->lock);
401
402 return ret;
403}
404
405
406
407
408
409static IIO_DEVICE_ATTR(measurement_mode_available, S_IRUGO,
410 sca3000_show_available_measurement_modes,
411 NULL, 0);
412
413static IIO_DEVICE_ATTR(measurement_mode, S_IRUGO | S_IWUSR,
414 sca3000_show_measurement_mode,
415 sca3000_store_measurement_mode,
416 0);
417
418
419
420static IIO_DEVICE_ATTR(revision, S_IRUGO, sca3000_show_rev, NULL, 0);
421
422#define SCA3000_EVENT_MASK \
423 (IIO_EV_BIT(IIO_EV_TYPE_MAG, IIO_EV_DIR_RISING))
424
425#define SCA3000_CHAN(index, mod) \
426 { \
427 .type = IIO_ACCEL, \
428 .modified = 1, \
429 .channel2 = mod, \
430 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
431 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
432 .address = index, \
433 .scan_index = index, \
434 .scan_type = { \
435 .sign = 's', \
436 .realbits = 11, \
437 .storagebits = 16, \
438 .shift = 5, \
439 }, \
440 .event_mask = SCA3000_EVENT_MASK, \
441 }
442
443static const struct iio_chan_spec sca3000_channels[] = {
444 SCA3000_CHAN(0, IIO_MOD_X),
445 SCA3000_CHAN(1, IIO_MOD_Y),
446 SCA3000_CHAN(2, IIO_MOD_Z),
447};
448
449static u8 sca3000_addresses[3][3] = {
450 [0] = {SCA3000_REG_ADDR_X_MSB, SCA3000_REG_CTRL_SEL_MD_X_TH,
451 SCA3000_MD_CTRL_OR_X},
452 [1] = {SCA3000_REG_ADDR_Y_MSB, SCA3000_REG_CTRL_SEL_MD_Y_TH,
453 SCA3000_MD_CTRL_OR_Y},
454 [2] = {SCA3000_REG_ADDR_Z_MSB, SCA3000_REG_CTRL_SEL_MD_Z_TH,
455 SCA3000_MD_CTRL_OR_Z},
456};
457
458static int sca3000_read_raw(struct iio_dev *indio_dev,
459 struct iio_chan_spec const *chan,
460 int *val,
461 int *val2,
462 long mask)
463{
464 struct sca3000_state *st = iio_priv(indio_dev);
465 int ret;
466 u8 address;
467
468 switch (mask) {
469 case IIO_CHAN_INFO_RAW:
470 mutex_lock(&st->lock);
471 if (st->mo_det_use_count) {
472 mutex_unlock(&st->lock);
473 return -EBUSY;
474 }
475 address = sca3000_addresses[chan->address][0];
476 ret = sca3000_read_data_short(st, address, 2);
477 if (ret < 0) {
478 mutex_unlock(&st->lock);
479 return ret;
480 }
481 *val = (be16_to_cpup((__be16 *)st->rx) >> 3) & 0x1FFF;
482 *val = ((*val) << (sizeof(*val)*8 - 13)) >>
483 (sizeof(*val)*8 - 13);
484 mutex_unlock(&st->lock);
485 return IIO_VAL_INT;
486 case IIO_CHAN_INFO_SCALE:
487 *val = 0;
488 if (chan->type == IIO_ACCEL)
489 *val2 = st->info->scale;
490 else
491 *val2 = 555556;
492 return IIO_VAL_INT_PLUS_MICRO;
493 default:
494 return -EINVAL;
495 }
496}
497
498
499
500
501
502
503
504
505
506static ssize_t sca3000_read_av_freq(struct device *dev,
507 struct device_attribute *attr,
508 char *buf)
509{
510 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
511 struct sca3000_state *st = iio_priv(indio_dev);
512 int len = 0, ret, val;
513
514 mutex_lock(&st->lock);
515 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
516 val = st->rx[0];
517 mutex_unlock(&st->lock);
518 if (ret)
519 goto error_ret;
520
521 switch (val & 0x03) {
522 case SCA3000_MEAS_MODE_NORMAL:
523 len += sprintf(buf + len, "%d %d %d\n",
524 st->info->measurement_mode_freq,
525 st->info->measurement_mode_freq/2,
526 st->info->measurement_mode_freq/4);
527 break;
528 case SCA3000_MEAS_MODE_OP_1:
529 len += sprintf(buf + len, "%d %d %d\n",
530 st->info->option_mode_1_freq,
531 st->info->option_mode_1_freq/2,
532 st->info->option_mode_1_freq/4);
533 break;
534 case SCA3000_MEAS_MODE_OP_2:
535 len += sprintf(buf + len, "%d %d %d\n",
536 st->info->option_mode_2_freq,
537 st->info->option_mode_2_freq/2,
538 st->info->option_mode_2_freq/4);
539 break;
540 }
541 return len;
542error_ret:
543 return ret;
544}
545
546
547
548
549
550static inline int __sca3000_get_base_freq(struct sca3000_state *st,
551 const struct sca3000_chip_info *info,
552 int *base_freq)
553{
554 int ret;
555
556 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
557 if (ret)
558 goto error_ret;
559 switch (0x03 & st->rx[0]) {
560 case SCA3000_MEAS_MODE_NORMAL:
561 *base_freq = info->measurement_mode_freq;
562 break;
563 case SCA3000_MEAS_MODE_OP_1:
564 *base_freq = info->option_mode_1_freq;
565 break;
566 case SCA3000_MEAS_MODE_OP_2:
567 *base_freq = info->option_mode_2_freq;
568 break;
569 }
570error_ret:
571 return ret;
572}
573
574
575
576
577static ssize_t sca3000_read_frequency(struct device *dev,
578 struct device_attribute *attr,
579 char *buf)
580{
581 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
582 struct sca3000_state *st = iio_priv(indio_dev);
583 int ret, len = 0, base_freq = 0, val;
584
585 mutex_lock(&st->lock);
586 ret = __sca3000_get_base_freq(st, st->info, &base_freq);
587 if (ret)
588 goto error_ret_mut;
589 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
590 mutex_unlock(&st->lock);
591 if (ret)
592 goto error_ret;
593 val = ret;
594 if (base_freq > 0)
595 switch (val & 0x03) {
596 case 0x00:
597 case 0x03:
598 len = sprintf(buf, "%d\n", base_freq);
599 break;
600 case 0x01:
601 len = sprintf(buf, "%d\n", base_freq/2);
602 break;
603 case 0x02:
604 len = sprintf(buf, "%d\n", base_freq/4);
605 break;
606 }
607
608 return len;
609error_ret_mut:
610 mutex_unlock(&st->lock);
611error_ret:
612 return ret;
613}
614
615
616
617
618static ssize_t sca3000_set_frequency(struct device *dev,
619 struct device_attribute *attr,
620 const char *buf,
621 size_t len)
622{
623 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
624 struct sca3000_state *st = iio_priv(indio_dev);
625 int ret, base_freq = 0;
626 int ctrlval;
627 long val;
628
629 ret = strict_strtol(buf, 10, &val);
630 if (ret)
631 return ret;
632
633 mutex_lock(&st->lock);
634
635 ret = __sca3000_get_base_freq(st, st->info, &base_freq);
636 if (ret)
637 goto error_free_lock;
638
639 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
640 if (ret < 0)
641 goto error_free_lock;
642 ctrlval = ret;
643
644 ctrlval &= ~0x03;
645
646 if (val == base_freq/2) {
647 ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_2;
648 } else if (val == base_freq/4) {
649 ctrlval |= SCA3000_OUT_CTRL_BUF_DIV_4;
650 } else if (val != base_freq) {
651 ret = -EINVAL;
652 goto error_free_lock;
653 }
654 ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
655 ctrlval);
656error_free_lock:
657 mutex_unlock(&st->lock);
658
659 return ret ? ret : len;
660}
661
662
663
664
665static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(sca3000_read_av_freq);
666
667static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
668 sca3000_read_frequency,
669 sca3000_set_frequency);
670
671
672
673
674
675
676
677
678
679static ssize_t sca3000_read_temp(struct device *dev,
680 struct device_attribute *attr,
681 char *buf)
682{
683 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
684 struct sca3000_state *st = iio_priv(indio_dev);
685 int ret;
686 int val;
687 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_TEMP_MSB, 2);
688 if (ret < 0)
689 goto error_ret;
690 val = ((st->rx[0] & 0x3F) << 3) | ((st->rx[1] & 0xE0) >> 5);
691
692 return sprintf(buf, "%d\n", val);
693
694error_ret:
695 return ret;
696}
697static IIO_DEV_ATTR_TEMP_RAW(sca3000_read_temp);
698
699static IIO_CONST_ATTR_TEMP_SCALE("0.555556");
700static IIO_CONST_ATTR_TEMP_OFFSET("-214.6");
701
702
703
704
705static int sca3000_read_thresh(struct iio_dev *indio_dev,
706 u64 e,
707 int *val)
708{
709 int ret, i;
710 struct sca3000_state *st = iio_priv(indio_dev);
711 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
712 mutex_lock(&st->lock);
713 ret = sca3000_read_ctrl_reg(st, sca3000_addresses[num][1]);
714 mutex_unlock(&st->lock);
715 if (ret < 0)
716 return ret;
717 *val = 0;
718 if (num == 1)
719 for_each_set_bit(i, (unsigned long *)&ret,
720 ARRAY_SIZE(st->info->mot_det_mult_y))
721 *val += st->info->mot_det_mult_y[i];
722 else
723 for_each_set_bit(i, (unsigned long *)&ret,
724 ARRAY_SIZE(st->info->mot_det_mult_xz))
725 *val += st->info->mot_det_mult_xz[i];
726
727 return 0;
728}
729
730
731
732
733static int sca3000_write_thresh(struct iio_dev *indio_dev,
734 u64 e,
735 int val)
736{
737 struct sca3000_state *st = iio_priv(indio_dev);
738 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
739 int ret;
740 int i;
741 u8 nonlinear = 0;
742
743 if (num == 1) {
744 i = ARRAY_SIZE(st->info->mot_det_mult_y);
745 while (i > 0)
746 if (val >= st->info->mot_det_mult_y[--i]) {
747 nonlinear |= (1 << i);
748 val -= st->info->mot_det_mult_y[i];
749 }
750 } else {
751 i = ARRAY_SIZE(st->info->mot_det_mult_xz);
752 while (i > 0)
753 if (val >= st->info->mot_det_mult_xz[--i]) {
754 nonlinear |= (1 << i);
755 val -= st->info->mot_det_mult_xz[i];
756 }
757 }
758
759 mutex_lock(&st->lock);
760 ret = sca3000_write_ctrl_reg(st, sca3000_addresses[num][1], nonlinear);
761 mutex_unlock(&st->lock);
762
763 return ret;
764}
765
766static struct attribute *sca3000_attributes[] = {
767 &iio_dev_attr_revision.dev_attr.attr,
768 &iio_dev_attr_measurement_mode_available.dev_attr.attr,
769 &iio_dev_attr_measurement_mode.dev_attr.attr,
770 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
771 &iio_dev_attr_sampling_frequency.dev_attr.attr,
772 NULL,
773};
774
775static struct attribute *sca3000_attributes_with_temp[] = {
776 &iio_dev_attr_revision.dev_attr.attr,
777 &iio_dev_attr_measurement_mode_available.dev_attr.attr,
778 &iio_dev_attr_measurement_mode.dev_attr.attr,
779 &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
780 &iio_dev_attr_sampling_frequency.dev_attr.attr,
781
782 &iio_dev_attr_in_temp_raw.dev_attr.attr,
783 &iio_const_attr_in_temp_offset.dev_attr.attr,
784 &iio_const_attr_in_temp_scale.dev_attr.attr,
785 NULL,
786};
787
788static const struct attribute_group sca3000_attribute_group = {
789 .attrs = sca3000_attributes,
790};
791
792static const struct attribute_group sca3000_attribute_group_with_temp = {
793 .attrs = sca3000_attributes_with_temp,
794};
795
796
797
798
799
800
801
802
803
804
805
806static irqreturn_t sca3000_event_handler(int irq, void *private)
807{
808 struct iio_dev *indio_dev = private;
809 struct sca3000_state *st = iio_priv(indio_dev);
810 int ret, val;
811 s64 last_timestamp = iio_get_time_ns();
812
813
814
815
816 mutex_lock(&st->lock);
817 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1);
818 val = st->rx[0];
819 mutex_unlock(&st->lock);
820 if (ret)
821 goto done;
822
823 sca3000_ring_int_process(val, indio_dev->buffer);
824
825 if (val & SCA3000_INT_STATUS_FREE_FALL)
826 iio_push_event(indio_dev,
827 IIO_MOD_EVENT_CODE(IIO_ACCEL,
828 0,
829 IIO_MOD_X_AND_Y_AND_Z,
830 IIO_EV_TYPE_MAG,
831 IIO_EV_DIR_FALLING),
832 last_timestamp);
833
834 if (val & SCA3000_INT_STATUS_Y_TRIGGER)
835 iio_push_event(indio_dev,
836 IIO_MOD_EVENT_CODE(IIO_ACCEL,
837 0,
838 IIO_MOD_Y,
839 IIO_EV_TYPE_MAG,
840 IIO_EV_DIR_RISING),
841 last_timestamp);
842
843 if (val & SCA3000_INT_STATUS_X_TRIGGER)
844 iio_push_event(indio_dev,
845 IIO_MOD_EVENT_CODE(IIO_ACCEL,
846 0,
847 IIO_MOD_X,
848 IIO_EV_TYPE_MAG,
849 IIO_EV_DIR_RISING),
850 last_timestamp);
851
852 if (val & SCA3000_INT_STATUS_Z_TRIGGER)
853 iio_push_event(indio_dev,
854 IIO_MOD_EVENT_CODE(IIO_ACCEL,
855 0,
856 IIO_MOD_Z,
857 IIO_EV_TYPE_MAG,
858 IIO_EV_DIR_RISING),
859 last_timestamp);
860
861done:
862 return IRQ_HANDLED;
863}
864
865
866
867
868static int sca3000_read_event_config(struct iio_dev *indio_dev,
869 u64 e)
870{
871 struct sca3000_state *st = iio_priv(indio_dev);
872 int ret;
873 u8 protect_mask = 0x03;
874 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
875
876
877 mutex_lock(&st->lock);
878 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
879 if (ret)
880 goto error_ret;
881
882 if ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET)
883 ret = 0;
884 else {
885 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
886 if (ret < 0)
887 goto error_ret;
888
889 ret = !!(ret & sca3000_addresses[num][2]);
890 }
891error_ret:
892 mutex_unlock(&st->lock);
893
894 return ret;
895}
896
897
898
899static ssize_t sca3000_query_free_fall_mode(struct device *dev,
900 struct device_attribute *attr,
901 char *buf)
902{
903 int ret, len;
904 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
905 struct sca3000_state *st = iio_priv(indio_dev);
906 int val;
907
908 mutex_lock(&st->lock);
909 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
910 val = st->rx[0];
911 mutex_unlock(&st->lock);
912 if (ret < 0)
913 return ret;
914 len = sprintf(buf, "%d\n",
915 !!(val & SCA3000_FREE_FALL_DETECT));
916 return len;
917}
918
919
920
921
922
923
924
925
926
927static ssize_t sca3000_set_free_fall_mode(struct device *dev,
928 struct device_attribute *attr,
929 const char *buf,
930 size_t len)
931{
932 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
933 struct sca3000_state *st = iio_priv(indio_dev);
934 long val;
935 int ret;
936 u8 protect_mask = SCA3000_FREE_FALL_DETECT;
937
938 mutex_lock(&st->lock);
939 ret = strict_strtol(buf, 10, &val);
940 if (ret)
941 goto error_ret;
942
943
944 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
945 if (ret)
946 goto error_ret;
947
948
949 if (val && !(st->rx[0] & protect_mask))
950 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
951 (st->rx[0] | SCA3000_FREE_FALL_DETECT));
952
953 else if (!val && (st->rx[0] & protect_mask))
954 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
955 (st->rx[0] & ~protect_mask));
956error_ret:
957 mutex_unlock(&st->lock);
958
959 return ret ? ret : len;
960}
961
962
963
964
965
966
967
968
969
970
971static int sca3000_write_event_config(struct iio_dev *indio_dev,
972 u64 e,
973 int state)
974{
975 struct sca3000_state *st = iio_priv(indio_dev);
976 int ret, ctrlval;
977 u8 protect_mask = 0x03;
978 int num = IIO_EVENT_CODE_EXTRACT_MODIFIER(e);
979
980 mutex_lock(&st->lock);
981
982
983 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
984 if (ret < 0)
985 goto exit_point;
986 ctrlval = ret;
987
988 if (state && !(ctrlval & sca3000_addresses[num][2])) {
989 ret = sca3000_write_ctrl_reg(st,
990 SCA3000_REG_CTRL_SEL_MD_CTRL,
991 ctrlval |
992 sca3000_addresses[num][2]);
993 if (ret)
994 goto exit_point;
995 st->mo_det_use_count++;
996 } else if (!state && (ctrlval & sca3000_addresses[num][2])) {
997 ret = sca3000_write_ctrl_reg(st,
998 SCA3000_REG_CTRL_SEL_MD_CTRL,
999 ctrlval &
1000 ~(sca3000_addresses[num][2]));
1001 if (ret)
1002 goto exit_point;
1003 st->mo_det_use_count--;
1004 }
1005
1006
1007 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
1008 if (ret)
1009 goto exit_point;
1010
1011 if ((st->mo_det_use_count)
1012 && ((st->rx[0] & protect_mask) != SCA3000_MEAS_MODE_MOT_DET))
1013 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
1014 (st->rx[0] & ~protect_mask)
1015 | SCA3000_MEAS_MODE_MOT_DET);
1016
1017 else if (!(st->mo_det_use_count)
1018 && ((st->rx[0] & protect_mask) == SCA3000_MEAS_MODE_MOT_DET))
1019 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
1020 (st->rx[0] & ~protect_mask));
1021exit_point:
1022 mutex_unlock(&st->lock);
1023
1024 return ret;
1025}
1026
1027
1028static IIO_DEVICE_ATTR_NAMED(accel_xayaz_mag_falling_en,
1029 in_accel_x&y&z_mag_falling_en,
1030 S_IRUGO | S_IWUSR,
1031 sca3000_query_free_fall_mode,
1032 sca3000_set_free_fall_mode,
1033 0);
1034
1035static IIO_CONST_ATTR_NAMED(accel_xayaz_mag_falling_period,
1036 in_accel_x&y&z_mag_falling_period,
1037 "0.226");
1038
1039static struct attribute *sca3000_event_attributes[] = {
1040 &iio_dev_attr_accel_xayaz_mag_falling_en.dev_attr.attr,
1041 &iio_const_attr_accel_xayaz_mag_falling_period.dev_attr.attr,
1042 NULL,
1043};
1044
1045static struct attribute_group sca3000_event_attribute_group = {
1046 .attrs = sca3000_event_attributes,
1047 .name = "events",
1048};
1049
1050
1051
1052
1053
1054
1055
1056
1057static int sca3000_clean_setup(struct sca3000_state *st)
1058{
1059 int ret;
1060
1061 mutex_lock(&st->lock);
1062
1063 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_STATUS, 1);
1064 if (ret)
1065 goto error_ret;
1066
1067
1068 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL);
1069 if (ret < 0)
1070 goto error_ret;
1071 ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_MD_CTRL,
1072 ret & SCA3000_MD_CTRL_PROT_MASK);
1073 if (ret)
1074 goto error_ret;
1075
1076
1077 ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
1078 ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
1079 (ret & SCA3000_OUT_CTRL_PROT_MASK)
1080 | SCA3000_OUT_CTRL_BUF_X_EN
1081 | SCA3000_OUT_CTRL_BUF_Y_EN
1082 | SCA3000_OUT_CTRL_BUF_Z_EN
1083 | SCA3000_OUT_CTRL_BUF_DIV_4);
1084 if (ret)
1085 goto error_ret;
1086
1087 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
1088 if (ret)
1089 goto error_ret;
1090 ret = sca3000_write_reg(st,
1091 SCA3000_REG_ADDR_INT_MASK,
1092 (ret & SCA3000_INT_MASK_PROT_MASK)
1093 | SCA3000_INT_MASK_ACTIVE_LOW);
1094 if (ret)
1095 goto error_ret;
1096
1097
1098
1099 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_MODE, 1);
1100 if (ret)
1101 goto error_ret;
1102 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
1103 (st->rx[0] & SCA3000_MODE_PROT_MASK));
1104 st->bpse = 11;
1105
1106error_ret:
1107 mutex_unlock(&st->lock);
1108 return ret;
1109}
1110
1111static const struct iio_info sca3000_info = {
1112 .attrs = &sca3000_attribute_group,
1113 .read_raw = &sca3000_read_raw,
1114 .event_attrs = &sca3000_event_attribute_group,
1115 .read_event_value = &sca3000_read_thresh,
1116 .write_event_value = &sca3000_write_thresh,
1117 .read_event_config = &sca3000_read_event_config,
1118 .write_event_config = &sca3000_write_event_config,
1119 .driver_module = THIS_MODULE,
1120};
1121
1122static const struct iio_info sca3000_info_with_temp = {
1123 .attrs = &sca3000_attribute_group_with_temp,
1124 .read_raw = &sca3000_read_raw,
1125 .read_event_value = &sca3000_read_thresh,
1126 .write_event_value = &sca3000_write_thresh,
1127 .read_event_config = &sca3000_read_event_config,
1128 .write_event_config = &sca3000_write_event_config,
1129 .driver_module = THIS_MODULE,
1130};
1131
1132static int sca3000_probe(struct spi_device *spi)
1133{
1134 int ret;
1135 struct sca3000_state *st;
1136 struct iio_dev *indio_dev;
1137
1138 indio_dev = iio_device_alloc(sizeof(*st));
1139 if (indio_dev == NULL) {
1140 ret = -ENOMEM;
1141 goto error_ret;
1142 }
1143
1144 st = iio_priv(indio_dev);
1145 spi_set_drvdata(spi, indio_dev);
1146 st->us = spi;
1147 mutex_init(&st->lock);
1148 st->info = &sca3000_spi_chip_info_tbl[spi_get_device_id(spi)
1149 ->driver_data];
1150
1151 indio_dev->dev.parent = &spi->dev;
1152 indio_dev->name = spi_get_device_id(spi)->name;
1153 if (st->info->temp_output)
1154 indio_dev->info = &sca3000_info_with_temp;
1155 else {
1156 indio_dev->info = &sca3000_info;
1157 indio_dev->channels = sca3000_channels;
1158 indio_dev->num_channels = ARRAY_SIZE(sca3000_channels);
1159 }
1160 indio_dev->modes = INDIO_DIRECT_MODE;
1161
1162 sca3000_configure_ring(indio_dev);
1163 ret = iio_device_register(indio_dev);
1164 if (ret < 0)
1165 goto error_free_dev;
1166
1167 ret = iio_buffer_register(indio_dev,
1168 sca3000_channels,
1169 ARRAY_SIZE(sca3000_channels));
1170 if (ret < 0)
1171 goto error_unregister_dev;
1172 if (indio_dev->buffer) {
1173 iio_scan_mask_set(indio_dev, indio_dev->buffer, 0);
1174 iio_scan_mask_set(indio_dev, indio_dev->buffer, 1);
1175 iio_scan_mask_set(indio_dev, indio_dev->buffer, 2);
1176 }
1177
1178 if (spi->irq) {
1179 ret = request_threaded_irq(spi->irq,
1180 NULL,
1181 &sca3000_event_handler,
1182 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
1183 "sca3000",
1184 indio_dev);
1185 if (ret)
1186 goto error_unregister_ring;
1187 }
1188 sca3000_register_ring_funcs(indio_dev);
1189 ret = sca3000_clean_setup(st);
1190 if (ret)
1191 goto error_free_irq;
1192 return 0;
1193
1194error_free_irq:
1195 if (spi->irq)
1196 free_irq(spi->irq, indio_dev);
1197error_unregister_ring:
1198 iio_buffer_unregister(indio_dev);
1199error_unregister_dev:
1200 iio_device_unregister(indio_dev);
1201error_free_dev:
1202 iio_device_free(indio_dev);
1203
1204error_ret:
1205 return ret;
1206}
1207
1208static int sca3000_stop_all_interrupts(struct sca3000_state *st)
1209{
1210 int ret;
1211
1212 mutex_lock(&st->lock);
1213 ret = sca3000_read_data_short(st, SCA3000_REG_ADDR_INT_MASK, 1);
1214 if (ret)
1215 goto error_ret;
1216 ret = sca3000_write_reg(st, SCA3000_REG_ADDR_INT_MASK,
1217 (st->rx[0] &
1218 ~(SCA3000_INT_MASK_RING_THREE_QUARTER |
1219 SCA3000_INT_MASK_RING_HALF |
1220 SCA3000_INT_MASK_ALL_INTS)));
1221error_ret:
1222 mutex_unlock(&st->lock);
1223 return ret;
1224}
1225
1226static int sca3000_remove(struct spi_device *spi)
1227{
1228 struct iio_dev *indio_dev = spi_get_drvdata(spi);
1229 struct sca3000_state *st = iio_priv(indio_dev);
1230
1231
1232 sca3000_stop_all_interrupts(st);
1233 if (spi->irq)
1234 free_irq(spi->irq, indio_dev);
1235 iio_device_unregister(indio_dev);
1236 iio_buffer_unregister(indio_dev);
1237 sca3000_unconfigure_ring(indio_dev);
1238 iio_device_free(indio_dev);
1239
1240 return 0;
1241}
1242
1243static const struct spi_device_id sca3000_id[] = {
1244 {"sca3000_d01", d01},
1245 {"sca3000_e02", e02},
1246 {"sca3000_e04", e04},
1247 {"sca3000_e05", e05},
1248 {}
1249};
1250MODULE_DEVICE_TABLE(spi, sca3000_id);
1251
1252static struct spi_driver sca3000_driver = {
1253 .driver = {
1254 .name = "sca3000",
1255 .owner = THIS_MODULE,
1256 },
1257 .probe = sca3000_probe,
1258 .remove = sca3000_remove,
1259 .id_table = sca3000_id,
1260};
1261module_spi_driver(sca3000_driver);
1262
1263MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
1264MODULE_DESCRIPTION("VTI SCA3000 Series Accelerometers SPI driver");
1265MODULE_LICENSE("GPL v2");
1266