aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/iio/accel/kxcjk-1013.c
blob: 7941cf2d31eec0783031fb304843614ed0911726 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
/*
 * KXCJK-1013 3-axis accelerometer driver
 * Copyright (c) 2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/accel/kxcjk_1013.h>

#define KXCJK1013_DRV_NAME "kxcjk1013"
#define KXCJK1013_IRQ_NAME "kxcjk1013_event"

#define KXCJK1013_REG_XOUT_L		0x06
/*
 * From low byte X axis register, all the other addresses of Y and Z can be
 * obtained by just applying axis offset. The following axis defines are just
 * provide clarity, but not used.
 */
#define KXCJK1013_REG_XOUT_H		0x07
#define KXCJK1013_REG_YOUT_L		0x08
#define KXCJK1013_REG_YOUT_H		0x09
#define KXCJK1013_REG_ZOUT_L		0x0A
#define KXCJK1013_REG_ZOUT_H		0x0B

#define KXCJK1013_REG_DCST_RESP		0x0C
#define KXCJK1013_REG_WHO_AM_I		0x0F
#define KXCJK1013_REG_INT_SRC1		0x16
#define KXCJK1013_REG_INT_SRC2		0x17
#define KXCJK1013_REG_STATUS_REG	0x18
#define KXCJK1013_REG_INT_REL		0x1A
#define KXCJK1013_REG_CTRL1		0x1B
#define KXCJK1013_REG_CTRL2		0x1D
#define KXCJK1013_REG_INT_CTRL1		0x1E
#define KXCJK1013_REG_INT_CTRL2		0x1F
#define KXCJK1013_REG_DATA_CTRL		0x21
#define KXCJK1013_REG_WAKE_TIMER	0x29
#define KXCJK1013_REG_SELF_TEST		0x3A
#define KXCJK1013_REG_WAKE_THRES	0x6A

#define KXCJK1013_REG_CTRL1_BIT_PC1	BIT(7)
#define KXCJK1013_REG_CTRL1_BIT_RES	BIT(6)
#define KXCJK1013_REG_CTRL1_BIT_DRDY	BIT(5)
#define KXCJK1013_REG_CTRL1_BIT_GSEL1	BIT(4)
#define KXCJK1013_REG_CTRL1_BIT_GSEL0	BIT(3)
#define KXCJK1013_REG_CTRL1_BIT_WUFE	BIT(1)
#define KXCJK1013_REG_INT_REG1_BIT_IEA	BIT(4)
#define KXCJK1013_REG_INT_REG1_BIT_IEN	BIT(5)

#define KXCJK1013_DATA_MASK_12_BIT	0x0FFF
#define KXCJK1013_MAX_STARTUP_TIME_US	100000

struct kxcjk1013_data {
	struct i2c_client *client;
	struct iio_trigger *trig;
	bool trig_mode;
	struct mutex mutex;
	s16 buffer[8];
	int power_state;
	u8 odr_bits;
	bool active_high_intr;
};

enum kxcjk1013_axis {
	AXIS_X,
	AXIS_Y,
	AXIS_Z,
};

enum kxcjk1013_mode {
	STANDBY,
	OPERATION,
};

static const struct {
	int val;
	int val2;
	int odr_bits;
} samp_freq_table[] = { {0, 781000, 0x08}, {1, 563000, 0x09},
			{3, 125000, 0x0A}, {6, 250000, 0x0B}, {12, 500000, 0},
			{25, 0, 0x01}, {50, 0, 0x02}, {100, 0, 0x03},
			{200, 0, 0x04}, {400, 0, 0x05}, {800, 0, 0x06},
			{1600, 0, 0x07} };

/* Refer to section 4 of the specification */
static const struct {
	int odr_bits;
	int usec;
} odr_start_up_times[] = { {0x08, 100000}, {0x09, 100000}, {0x0A, 100000},
			   {0x0B, 100000}, { 0, 80000}, {0x01, 41000},
			   {0x02, 21000}, {0x03, 11000}, {0x04, 6400},
			   {0x05, 3900}, {0x06, 2700}, {0x07, 2100} };

static int kxcjk1013_set_mode(struct kxcjk1013_data *data,
			      enum kxcjk1013_mode mode)
{
	int ret;

	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
		return ret;
	}

	if (mode == STANDBY)
		ret &= ~KXCJK1013_REG_CTRL1_BIT_PC1;
	else
		ret |= KXCJK1013_REG_CTRL1_BIT_PC1;

	ret = i2c_smbus_write_byte_data(data->client,
					KXCJK1013_REG_CTRL1, ret);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
		return ret;
	}

	return 0;
}

static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
{
	int ret;

	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_WHO_AM_I);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading who_am_i\n");
		return ret;
	}

	dev_dbg(&data->client->dev, "KXCJK1013 Chip Id %x\n", ret);

	ret = kxcjk1013_set_mode(data, STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
		return ret;
	}

	/* Setting range to 4G */
	ret |= KXCJK1013_REG_CTRL1_BIT_GSEL0;
	ret &= ~KXCJK1013_REG_CTRL1_BIT_GSEL1;

	/* Set 12 bit mode */
	ret |= KXCJK1013_REG_CTRL1_BIT_RES;

	ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_CTRL1,
					ret);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_ctrl\n");
		return ret;
	}

	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_DATA_CTRL);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_data_ctrl\n");
		return ret;
	}

	data->odr_bits = ret;

	/* Set up INT polarity */
	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_CTRL1);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_int_ctrl1\n");
		return ret;
	}

	if (data->active_high_intr)
		ret |= KXCJK1013_REG_INT_REG1_BIT_IEA;
	else
		ret &= ~KXCJK1013_REG_INT_REG1_BIT_IEA;

	ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_INT_CTRL1,
					ret);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n");
		return ret;
	}

	return 0;
}

static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data,
					  bool status)
{
	int ret;

	/* This is requirement by spec to change state to STANDBY */
	ret = kxcjk1013_set_mode(data, STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_CTRL1);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_int_ctrl1\n");
		return ret;
	}

	if (status)
		ret |= KXCJK1013_REG_INT_REG1_BIT_IEN;
	else
		ret &= ~KXCJK1013_REG_INT_REG1_BIT_IEN;

	ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_INT_CTRL1,
					ret);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n");
		return ret;
	}

	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
		return ret;
	}

	if (status)
		ret |= KXCJK1013_REG_CTRL1_BIT_DRDY;
	else
		ret &= ~KXCJK1013_REG_CTRL1_BIT_DRDY;

	ret = i2c_smbus_write_byte_data(data->client,
					KXCJK1013_REG_CTRL1, ret);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
		return ret;
	}

	return ret;
}

static int kxcjk1013_convert_freq_to_bit(int val, int val2)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(samp_freq_table); ++i) {
		if (samp_freq_table[i].val == val &&
			samp_freq_table[i].val2 == val2) {
			return samp_freq_table[i].odr_bits;
		}
	}

	return -EINVAL;
}

static int kxcjk1013_set_odr(struct kxcjk1013_data *data, int val, int val2)
{
	int ret;
	int odr_bits;

	odr_bits = kxcjk1013_convert_freq_to_bit(val, val2);
	if (odr_bits < 0)
		return odr_bits;

	/* To change ODR, the chip must be set to STANDBY as per spec */
	ret = kxcjk1013_set_mode(data, STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_DATA_CTRL,
					odr_bits);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error writing data_ctrl\n");
		return ret;
	}

	data->odr_bits = odr_bits;

	/* Check, if the ODR is changed after data enable */
	if (data->power_state) {
		/* Set the state back to operation */
		ret = kxcjk1013_set_mode(data, OPERATION);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int kxcjk1013_get_odr(struct kxcjk1013_data *data, int *val, int *val2)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(samp_freq_table); ++i) {
		if (samp_freq_table[i].odr_bits == data->odr_bits) {
			*val = samp_freq_table[i].val;
			*val2 = samp_freq_table[i].val2;
			return IIO_VAL_INT_PLUS_MICRO;
		}
	}

	return -EINVAL;
}

static int kxcjk1013_get_acc_reg(struct kxcjk1013_data *data, int axis)
{
	u8 reg = KXCJK1013_REG_XOUT_L + axis * 2;
	int ret;

	ret = i2c_smbus_read_word_data(data->client, reg);
	if (ret < 0) {
		dev_err(&data->client->dev,
			"failed to read accel_%c registers\n", 'x' + axis);
		return ret;
	}

	return ret;
}

static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(odr_start_up_times); ++i) {
		if (odr_start_up_times[i].odr_bits == data->odr_bits)
			return odr_start_up_times[i].usec;
	}

	return KXCJK1013_MAX_STARTUP_TIME_US;
}

static int kxcjk1013_read_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan, int *val,
			      int *val2, long mask)
{
	struct kxcjk1013_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		mutex_lock(&data->mutex);
		if (iio_buffer_enabled(indio_dev))
			ret = -EBUSY;
		else {
			int sleep_val;

			ret = kxcjk1013_set_mode(data, OPERATION);
			if (ret < 0) {
				mutex_unlock(&data->mutex);
				return ret;
			}
			++data->power_state;
			sleep_val = kxcjk1013_get_startup_times(data);
			if (sleep_val < 20000)
				usleep_range(sleep_val, 20000);
			else
				msleep_interruptible(sleep_val/1000);
			ret = kxcjk1013_get_acc_reg(data, chan->scan_index);
			if (--data->power_state == 0)
				kxcjk1013_set_mode(data, STANDBY);
		}
		mutex_unlock(&data->mutex);

		if (ret < 0)
			return ret;

		*val = sign_extend32(ret >> 4, 11);
		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = 19163; /* range +-4g (4/2047*9.806650) */
		return IIO_VAL_INT_PLUS_MICRO;

	case IIO_CHAN_INFO_SAMP_FREQ:
		mutex_lock(&data->mutex);
		ret = kxcjk1013_get_odr(data, val, val2);
		mutex_unlock(&data->mutex);
		return ret;

	default:
		return -EINVAL;
	}
}

static int kxcjk1013_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan, int val,
			       int val2, long mask)
{
	struct kxcjk1013_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		mutex_lock(&data->mutex);
		ret = kxcjk1013_set_odr(data, val, val2);
		mutex_unlock(&data->mutex);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int kxcjk1013_validate_trigger(struct iio_dev *indio_dev,
				      struct iio_trigger *trig)
{
	struct kxcjk1013_data *data = iio_priv(indio_dev);

	if (data->trig != trig)
		return -EINVAL;

	return 0;
}

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
	"0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800 1600");

static struct attribute *kxcjk1013_attributes[] = {
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group kxcjk1013_attrs_group = {
	.attrs = kxcjk1013_attributes,
};

#define KXCJK1013_CHANNEL(_axis) {					\
	.type = IIO_ACCEL,						\
	.modified = 1,							\
	.channel2 = IIO_MOD_##_axis,					\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |		\
				BIT(IIO_CHAN_INFO_SAMP_FREQ),		\
	.scan_index = AXIS_##_axis,					\
	.scan_type = {							\
		.sign = 's',						\
		.realbits = 12,						\
		.storagebits = 16,					\
		.shift = 4,						\
		.endianness = IIO_CPU,					\
	},								\
}

static const struct iio_chan_spec kxcjk1013_channels[] = {
	KXCJK1013_CHANNEL(X),
	KXCJK1013_CHANNEL(Y),
	KXCJK1013_CHANNEL(Z),
	IIO_CHAN_SOFT_TIMESTAMP(3),
};

static const struct iio_info kxcjk1013_info = {
	.attrs			= &kxcjk1013_attrs_group,
	.read_raw		= kxcjk1013_read_raw,
	.write_raw		= kxcjk1013_write_raw,
	.validate_trigger	= kxcjk1013_validate_trigger,
	.driver_module		= THIS_MODULE,
};

static irqreturn_t kxcjk1013_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct kxcjk1013_data *data = iio_priv(indio_dev);
	int bit, ret, i = 0;

	mutex_lock(&data->mutex);

	for_each_set_bit(bit, indio_dev->buffer->scan_mask,
			 indio_dev->masklength) {
		ret = kxcjk1013_get_acc_reg(data, bit);
		if (ret < 0) {
			mutex_unlock(&data->mutex);
			goto err;
		}
		data->buffer[i++] = ret;
	}
	mutex_unlock(&data->mutex);

	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
					   pf->timestamp);
err:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static int kxcjk1013_trig_try_reen(struct iio_trigger *trig)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct kxcjk1013_data *data = iio_priv(indio_dev);
	int ret;

	ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_REL);
	if (ret < 0) {
		dev_err(&data->client->dev, "Error reading reg_int_rel\n");
		return ret;
	}

	return 0;
}

static int kxcjk1013_data_rdy_trigger_set_state(struct iio_trigger *trig,
						bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct kxcjk1013_data *data = iio_priv(indio_dev);

	mutex_lock(&data->mutex);
	if (state) {
		kxcjk1013_chip_setup_interrupt(data, true);
		kxcjk1013_set_mode(data, OPERATION);
		++data->power_state;
	} else {
		if (--data->power_state) {
			mutex_unlock(&data->mutex);
			return 0;
		}
		kxcjk1013_chip_setup_interrupt(data, false);
		kxcjk1013_set_mode(data, STANDBY);
	}
	mutex_unlock(&data->mutex);

	return 0;
}

static const struct iio_trigger_ops kxcjk1013_trigger_ops = {
	.set_trigger_state = kxcjk1013_data_rdy_trigger_set_state,
	.try_reenable = kxcjk1013_trig_try_reen,
	.owner = THIS_MODULE,
};

static int kxcjk1013_acpi_gpio_probe(struct i2c_client *client,
				     struct kxcjk1013_data *data)
{
	const struct acpi_device_id *id;
	struct device *dev;
	struct gpio_desc *gpio;
	int ret;

	if (!client)
		return -EINVAL;

	dev = &client->dev;
	if (!ACPI_HANDLE(dev))
		return -ENODEV;

	id = acpi_match_device(dev->driver->acpi_match_table, dev);
	if (!id)
		return -ENODEV;

	/* data ready gpio interrupt pin */
	gpio = devm_gpiod_get_index(dev, "kxcjk1013_int", 0);
	if (IS_ERR(gpio)) {
		dev_err(dev, "acpi gpio get index failed\n");
		return PTR_ERR(gpio);
	}

	ret = gpiod_direction_input(gpio);
	if (ret)
		return ret;

	ret = gpiod_to_irq(gpio);

	dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);

	return ret;
}

static int kxcjk1013_probe(struct i2c_client *client,
			   const struct i2c_device_id *id)
{
	struct kxcjk1013_data *data;
	struct iio_dev *indio_dev;
	struct iio_trigger *trig = NULL;
	struct kxcjk_1013_platform_data *pdata;
	int ret;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	pdata = dev_get_platdata(&client->dev);
	if (pdata)
		data->active_high_intr = pdata->active_high_intr;
	else
		data->active_high_intr = true; /* default polarity */

	ret = kxcjk1013_chip_init(data);
	if (ret < 0)
		return ret;

	mutex_init(&data->mutex);

	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = kxcjk1013_channels;
	indio_dev->num_channels = ARRAY_SIZE(kxcjk1013_channels);
	indio_dev->name = KXCJK1013_DRV_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &kxcjk1013_info;

	if (client->irq < 0)
		client->irq = kxcjk1013_acpi_gpio_probe(client, data);

	if (client->irq >= 0) {
		trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
					 indio_dev->id);
		if (!trig)
			return -ENOMEM;

		data->trig_mode = true;

		ret = devm_request_irq(&client->dev, client->irq,
					iio_trigger_generic_data_rdy_poll,
					IRQF_TRIGGER_RISING,
					KXCJK1013_IRQ_NAME,
					trig);
		if (ret) {
			dev_err(&client->dev, "unable to request IRQ\n");
			goto err_trigger_free;
		}

		trig->dev.parent = &client->dev;
		trig->ops = &kxcjk1013_trigger_ops;
		iio_trigger_set_drvdata(trig, indio_dev);
		data->trig = trig;
		indio_dev->trig = trig;
		iio_trigger_get(indio_dev->trig);

		ret = iio_trigger_register(trig);
		if (ret)
			goto err_trigger_free;

		ret = iio_triggered_buffer_setup(indio_dev,
						&iio_pollfunc_store_time,
						kxcjk1013_trigger_handler,
						NULL);
		if (ret < 0) {
			dev_err(&client->dev,
					"iio triggered buffer setup failed\n");
			goto err_trigger_unregister;
		}
	}

	ret = devm_iio_device_register(&client->dev, indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "unable to register iio device\n");
		goto err_buffer_cleanup;
	}

	return 0;

err_buffer_cleanup:
	if (data->trig_mode)
		iio_triggered_buffer_cleanup(indio_dev);
err_trigger_unregister:
	if (data->trig_mode)
		iio_trigger_unregister(trig);
err_trigger_free:
	if (data->trig_mode)
		iio_trigger_free(trig);

	return ret;
}

static int kxcjk1013_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct kxcjk1013_data *data = iio_priv(indio_dev);

	if (data->trig_mode) {
		iio_triggered_buffer_cleanup(indio_dev);
		iio_trigger_unregister(data->trig);
		iio_trigger_free(data->trig);
	}

	mutex_lock(&data->mutex);
	kxcjk1013_set_mode(data, STANDBY);
	mutex_unlock(&data->mutex);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int kxcjk1013_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct kxcjk1013_data *data = iio_priv(indio_dev);

	mutex_lock(&data->mutex);
	kxcjk1013_set_mode(data, STANDBY);
	mutex_unlock(&data->mutex);

	return 0;
}

static int kxcjk1013_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct kxcjk1013_data *data = iio_priv(indio_dev);

	mutex_lock(&data->mutex);

	if (data->power_state)
		kxcjk1013_set_mode(data, OPERATION);

	mutex_unlock(&data->mutex);

	return 0;
}

static SIMPLE_DEV_PM_OPS(kxcjk1013_pm_ops, kxcjk1013_suspend, kxcjk1013_resume);
#define KXCJK1013_PM_OPS (&kxcjk1013_pm_ops)
#else
#define KXCJK1013_PM_OPS NULL
#endif

static const struct acpi_device_id kx_acpi_match[] = {
	{"KXCJ1013", 0},
	{ },
};
MODULE_DEVICE_TABLE(acpi, kx_acpi_match);

static const struct i2c_device_id kxcjk1013_id[] = {
	{"kxcjk1013", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, kxcjk1013_id);

static struct i2c_driver kxcjk1013_driver = {
	.driver = {
		.name	= KXCJK1013_DRV_NAME,
		.acpi_match_table = ACPI_PTR(kx_acpi_match),
		.pm	= KXCJK1013_PM_OPS,
	},
	.probe		= kxcjk1013_probe,
	.remove		= kxcjk1013_remove,
	.id_table	= kxcjk1013_id,
};
module_i2c_driver(kxcjk1013_driver);

MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("KXCJK1013 accelerometer driver");