summaryrefslogtreecommitdiffstats
path: root/drivers/misc/lis3lv02d/lis3lv02d.c
blob: 70c5bb1e6f4966058be0dd133dcf6b5047185516 (plain)
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
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
 *
 *  Copyright (C) 2007-2008 Yan Burman
 *  Copyright (C) 2008 Eric Piel
 *  Copyright (C) 2008-2009 Pavel Machek
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/sched/signal.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/freezer.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/pm_runtime.h>
#include <linux/atomic.h>
#include <linux/of_device.h>
#include "lis3lv02d.h"

#define DRIVER_NAME     "lis3lv02d"

/* joystick device poll interval in milliseconds */
#define MDPS_POLL_INTERVAL 50
#define MDPS_POLL_MIN	   0
#define MDPS_POLL_MAX	   2000

#define LIS3_SYSFS_POWERDOWN_DELAY 5000 /* In milliseconds */

#define SELFTEST_OK	       0
#define SELFTEST_FAIL	       -1
#define SELFTEST_IRQ	       -2

#define IRQ_LINE0	       0
#define IRQ_LINE1	       1

/*
 * The sensor can also generate interrupts (DRDY) but it's pretty pointless
 * because they are generated even if the data do not change. So it's better
 * to keep the interrupt for the free-fall event. The values are updated at
 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
 * some low processor, we poll the sensor only at 20Hz... enough for the
 * joystick.
 */

#define LIS3_PWRON_DELAY_WAI_12B	(5000)
#define LIS3_PWRON_DELAY_WAI_8B		(3000)

/*
 * LIS3LV02D spec says 1024 LSBs corresponds 1 G -> 1LSB is 1000/1024 mG
 * LIS302D spec says: 18 mG / digit
 * LIS3_ACCURACY is used to increase accuracy of the intermediate
 * calculation results.
 */
#define LIS3_ACCURACY			1024
/* Sensitivity values for -2G +2G scale */
#define LIS3_SENSITIVITY_12B		((LIS3_ACCURACY * 1000) / 1024)
#define LIS3_SENSITIVITY_8B		(18 * LIS3_ACCURACY)

/*
 * LIS331DLH spec says 1LSBs corresponds 4G/4096 -> 1LSB is 1000/1024 mG.
 * Below macros defines sensitivity values for +/-2G. Dataout bits for
 * +/-2G range is 12 bits so 4 bits adjustment must be done to get 12bit
 * data from 16bit value. Currently this driver supports only 2G range.
 */
#define LIS3DLH_SENSITIVITY_2G		((LIS3_ACCURACY * 1000) / 1024)
#define SHIFT_ADJ_2G			4

#define LIS3_DEFAULT_FUZZ_12B		3
#define LIS3_DEFAULT_FLAT_12B		3
#define LIS3_DEFAULT_FUZZ_8B		1
#define LIS3_DEFAULT_FLAT_8B		1

struct lis3lv02d lis3_dev = {
	.misc_wait   = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
};
EXPORT_SYMBOL_GPL(lis3_dev);

/* just like param_set_int() but does sanity-check so that it won't point
 * over the axis array size
 */
static int param_set_axis(const char *val, const struct kernel_param *kp)
{
	int ret = param_set_int(val, kp);
	if (!ret) {
		int val = *(int *)kp->arg;
		if (val < 0)
			val = -val;
		if (!val || val > 3)
			return -EINVAL;
	}
	return ret;
}

static const struct kernel_param_ops param_ops_axis = {
	.set = param_set_axis,
	.get = param_get_int,
};

#define param_check_axis(name, p) param_check_int(name, p)

module_param_array_named(axes, lis3_dev.ac.as_array, axis, NULL, 0644);
MODULE_PARM_DESC(axes, "Axis-mapping for x,y,z directions");

static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg)
{
	s8 lo;
	if (lis3->read(lis3, reg, &lo) < 0)
		return 0;

	return lo;
}

static s16 lis3lv02d_read_12(struct lis3lv02d *lis3, int reg)
{
	u8 lo, hi;

	lis3->read(lis3, reg - 1, &lo);
	lis3->read(lis3, reg, &hi);
	/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
	return (s16)((hi << 8) | lo);
}

/* 12bits for 2G range, 13 bits for 4G range and 14 bits for 8G range */
static s16 lis331dlh_read_data(struct lis3lv02d *lis3, int reg)
{
	u8 lo, hi;
	int v;

	lis3->read(lis3, reg - 1, &lo);
	lis3->read(lis3, reg, &hi);
	v = (int) ((hi << 8) | lo);

	return (s16) v >> lis3->shift_adj;
}

/**
 * lis3lv02d_get_axis - For the given axis, give the value converted
 * @axis:      1,2,3 - can also be negative
 * @hw_values: raw values returned by the hardware
 *
 * Returns the converted value.
 */
static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
{
	if (axis > 0)
		return hw_values[axis - 1];
	else
		return -hw_values[-axis - 1];
}

/**
 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 * @lis3: pointer to the device struct
 * @x:    where to store the X axis value
 * @y:    where to store the Y axis value
 * @z:    where to store the Z axis value
 *
 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 */
static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
{
	int position[3];
	int i;

	if (lis3->blkread) {
		if (lis3->whoami == WAI_12B) {
			u16 data[3];
			lis3->blkread(lis3, OUTX_L, 6, (u8 *)data);
			for (i = 0; i < 3; i++)
				position[i] = (s16)le16_to_cpu(data[i]);
		} else {
			u8 data[5];
			/* Data: x, dummy, y, dummy, z */
			lis3->blkread(lis3, OUTX, 5, data);
			for (i = 0; i < 3; i++)
				position[i] = (s8)data[i * 2];
		}
	} else {
		position[0] = lis3->read_data(lis3, OUTX);
		position[1] = lis3->read_data(lis3, OUTY);
		position[2] = lis3->read_data(lis3, OUTZ);
	}

	for (i = 0; i < 3; i++)
		position[i] = (position[i] * lis3->scale) / LIS3_ACCURACY;

	*x = lis3lv02d_get_axis(lis3->ac.x, position);
	*y = lis3lv02d_get_axis(lis3->ac.y, position);
	*z = lis3lv02d_get_axis(lis3->ac.z, position);
}

/* conversion btw sampling rate and the register values */
static int lis3_12_rates[4] = {40, 160, 640, 2560};
static int lis3_8_rates[2] = {100, 400};
static int lis3_3dc_rates[16] = {0, 1, 10, 25, 50, 100, 200, 400, 1600, 5000};
static int lis3_3dlh_rates[4] = {50, 100, 400, 1000};

/* ODR is Output Data Rate */
static int lis3lv02d_get_odr_index(struct lis3lv02d *lis3)
{
	u8 ctrl;
	int shift;

	lis3->read(lis3, CTRL_REG1, &ctrl);
	ctrl &= lis3->odr_mask;
	shift = ffs(lis3->odr_mask) - 1;
	return (ctrl >> shift);
}

static int lis3lv02d_get_pwron_wait(struct lis3lv02d *lis3)
{
	int odr_idx = lis3lv02d_get_odr_index(lis3);
	int div = lis3->odrs[odr_idx];

	if (div == 0) {
		if (odr_idx == 0) {
			/* Power-down mode, not sampling no need to sleep */
			return 0;
		}

		dev_err(&lis3->pdev->dev, "Error unknown odrs-index: %d\n", odr_idx);
		return -ENXIO;
	}

	/* LIS3 power on delay is quite long */
	msleep(lis3->pwron_delay / div);
	return 0;
}

static int lis3lv02d_set_odr(struct lis3lv02d *lis3, int rate)
{
	u8 ctrl;
	int i, len, shift;

	if (!rate)
		return -EINVAL;

	lis3->read(lis3, CTRL_REG1, &ctrl);
	ctrl &= ~lis3->odr_mask;
	len = 1 << hweight_long(lis3->odr_mask); /* # of possible values */
	shift = ffs(lis3->odr_mask) - 1;

	for (i = 0; i < len; i++)
		if (lis3->odrs[i] == rate) {
			lis3->write(lis3, CTRL_REG1,
					ctrl | (i << shift));
			return 0;
		}
	return -EINVAL;
}

static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
{
	u8 ctlreg, reg;
	s16 x, y, z;
	u8 selftest;
	int ret;
	u8 ctrl_reg_data;
	unsigned char irq_cfg;

	mutex_lock(&lis3->mutex);

	irq_cfg = lis3->irq_cfg;
	if (lis3->whoami == WAI_8B) {
		lis3->data_ready_count[IRQ_LINE0] = 0;
		lis3->data_ready_count[IRQ_LINE1] = 0;

		/* Change interrupt cfg to data ready for selftest */
		atomic_inc(&lis3->wake_thread);
		lis3->irq_cfg = LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY;
		lis3->read(lis3, CTRL_REG3, &ctrl_reg_data);
		lis3->write(lis3, CTRL_REG3, (ctrl_reg_data &
				~(LIS3_IRQ1_MASK | LIS3_IRQ2_MASK)) |
				(LIS3_IRQ1_DATA_READY | LIS3_IRQ2_DATA_READY));
	}

	if ((lis3->whoami == WAI_3DC) || (lis3->whoami == WAI_3DLH)) {
		ctlreg = CTRL_REG4;
		selftest = CTRL4_ST0;
	} else {
		ctlreg = CTRL_REG1;
		if (lis3->whoami == WAI_12B)
			selftest = CTRL1_ST;
		else
			selftest = CTRL1_STP;
	}

	lis3->read(lis3, ctlreg, &reg);
	lis3->write(lis3, ctlreg, (reg | selftest));
	ret = lis3lv02d_get_pwron_wait(lis3);
	if (ret)
		goto fail;

	/* Read directly to avoid axis remap */
	x = lis3->read_data(lis3, OUTX);
	y = lis3->read_data(lis3, OUTY);
	z = lis3->read_data(lis3, OUTZ);

	/* back to normal settings */
	lis3->write(lis3, ctlreg, reg);
	ret = lis3lv02d_get_pwron_wait(lis3);
	if (ret)
		goto fail;

	results[0] = x - lis3->read_data(lis3, OUTX);
	results[1] = y - lis3->read_data(lis3, OUTY);
	results[2] = z - lis3->read_data(lis3, OUTZ);

	ret = 0;

	if (lis3->whoami == WAI_8B) {
		/* Restore original interrupt configuration */
		atomic_dec(&lis3->wake_thread);
		lis3->write(lis3, CTRL_REG3, ctrl_reg_data);
		lis3->irq_cfg = irq_cfg;

		if ((irq_cfg & LIS3_IRQ1_MASK) &&
			lis3->data_ready_count[IRQ_LINE0] < 2) {
			ret = SELFTEST_IRQ;
			goto fail;
		}

		if ((irq_cfg & LIS3_IRQ2_MASK) &&
			lis3->data_ready_count[IRQ_LINE1] < 2) {
			ret = SELFTEST_IRQ;
			goto fail;
		}
	}

	if (lis3->pdata) {
		int i;
		for (i = 0; i < 3; i++) {
			/* Check against selftest acceptance limits */
			if ((results[i] < lis3->pdata->st_min_limits[i]) ||
			    (results[i] > lis3->pdata->st_max_limits[i])) {
				ret = SELFTEST_FAIL;
				goto fail;
			}
		}
	}

	/* test passed */
fail:
	mutex_unlock(&lis3->mutex);
	return ret;
}

/*
 * Order of registers in the list affects to order of the restore process.
 * Perhaps it is a good idea to set interrupt enable register as a last one
 * after all other configurations
 */
static u8 lis3_wai8_regs[] = { FF_WU_CFG_1, FF_WU_THS_1, FF_WU_DURATION_1,
			       FF_WU_CFG_2, FF_WU_THS_2, FF_WU_DURATION_2,
			       CLICK_CFG, CLICK_SRC, CLICK_THSY_X, CLICK_THSZ,
			       CLICK_TIMELIMIT, CLICK_LATENCY, CLICK_WINDOW,
			       CTRL_REG1, CTRL_REG2, CTRL_REG3};

static u8 lis3_wai12_regs[] = {FF_WU_CFG, FF_WU_THS_L, FF_WU_THS_H,
			       FF_WU_DURATION, DD_CFG, DD_THSI_L, DD_THSI_H,
			       DD_THSE_L, DD_THSE_H,
			       CTRL_REG1, CTRL_REG3, CTRL_REG2};

static inline void lis3_context_save(struct lis3lv02d *lis3)
{
	int i;
	for (i = 0; i < lis3->regs_size; i++)
		lis3->read(lis3, lis3->regs[i], &lis3->reg_cache[i]);
	lis3->regs_stored = true;
}

static inline void lis3_context_restore(struct lis3lv02d *lis3)
{
	int i;
	if (lis3->regs_stored)
		for (i = 0; i < lis3->regs_size; i++)
			lis3->write(lis3, lis3->regs[i], lis3->reg_cache[i]);
}

void lis3lv02d_poweroff(struct lis3lv02d *lis3)
{
	if (lis3->reg_ctrl)
		lis3_context_save(lis3);
	/* disable X,Y,Z axis and power down */
	lis3->write(lis3, CTRL_REG1, 0x00);
	if (lis3->reg_ctrl)
		lis3->reg_ctrl(lis3, LIS3_REG_OFF);
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);

int lis3lv02d_poweron(struct lis3lv02d *lis3)
{
	int err;
	u8 reg;

	lis3->init(lis3);

	/*
	 * Common configuration
	 * BDU: (12 bits sensors only) LSB and MSB values are not updated until
	 *      both have been read. So the value read will always be correct.
	 * Set BOOT bit to refresh factory tuning values.
	 */
	if (lis3->pdata) {
		lis3->read(lis3, CTRL_REG2, &reg);
		if (lis3->whoami ==  WAI_12B)
			reg |= CTRL2_BDU | CTRL2_BOOT;
		else if (lis3->whoami ==  WAI_3DLH)
			reg |= CTRL2_BOOT_3DLH;
		else
			reg |= CTRL2_BOOT_8B;
		lis3->write(lis3, CTRL_REG2, reg);

		if (lis3->whoami ==  WAI_3DLH) {
			lis3->read(lis3, CTRL_REG4, &reg);
			reg |= CTRL4_BDU;
			lis3->write(lis3, CTRL_REG4, reg);
		}
	}

	err = lis3lv02d_get_pwron_wait(lis3);
	if (err)
		return err;

	if (lis3->reg_ctrl)
		lis3_context_restore(lis3);

	return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_poweron);


static void lis3lv02d_joystick_poll(struct input_dev *input)
{
	struct lis3lv02d *lis3 = input_get_drvdata(input);
	int x, y, z;

	mutex_lock(&lis3->mutex);
	lis3lv02d_get_xyz(lis3, &x, &y, &z);
	input_report_abs(input, ABS_X, x);
	input_report_abs(input, ABS_Y, y);
	input_report_abs(input, ABS_Z, z);
	input_sync(input);
	mutex_unlock(&lis3->mutex);
}

static int lis3lv02d_joystick_open(struct input_dev *input)
{
	struct lis3lv02d *lis3 = input_get_drvdata(input);

	if (lis3->pm_dev)
		pm_runtime_get_sync(lis3->pm_dev);

	if (lis3->pdata && lis3->whoami == WAI_8B && lis3->idev)
		atomic_set(&lis3->wake_thread, 1);
	/*
	 * Update coordinates for the case where poll interval is 0 and
	 * the chip in running purely under interrupt control
	 */
	lis3lv02d_joystick_poll(input);

	return 0;
}

static void lis3lv02d_joystick_close(struct input_dev *input)
{
	struct lis3lv02d *lis3 = input_get_drvdata(input);

	atomic_set(&lis3->wake_thread, 0);
	if (lis3->pm_dev)
		pm_runtime_put(lis3->pm_dev);
}

static irqreturn_t lis302dl_interrupt(int irq, void *data)
{
	struct lis3lv02d *lis3 = data;

	if (!test_bit(0, &lis3->misc_opened))
		goto out;

	/*
	 * Be careful: on some HP laptops the bios force DD when on battery and
	 * the lid is closed. This leads to interrupts as soon as a little move
	 * is done.
	 */
	atomic_inc(&lis3->count);

	wake_up_interruptible(&lis3->misc_wait);
	kill_fasync(&lis3->async_queue, SIGIO, POLL_IN);
out:
	if (atomic_read(&lis3->wake_thread))
		return IRQ_WAKE_THREAD;
	return IRQ_HANDLED;
}

static void lis302dl_interrupt_handle_click(struct lis3lv02d *lis3)
{
	struct input_dev *dev = lis3->idev;
	u8 click_src;

	mutex_lock(&lis3->mutex);
	lis3->read(lis3, CLICK_SRC, &click_src);

	if (click_src & CLICK_SINGLE_X) {
		input_report_key(dev, lis3->mapped_btns[0], 1);
		input_report_key(dev, lis3->mapped_btns[0], 0);
	}

	if (click_src & CLICK_SINGLE_Y) {
		input_report_key(dev, lis3->mapped_btns[1], 1);
		input_report_key(dev, lis3->mapped_btns[1], 0);
	}

	if (click_src & CLICK_SINGLE_Z) {
		input_report_key(dev, lis3->mapped_btns[2], 1);
		input_report_key(dev, lis3->mapped_btns[2], 0);
	}
	input_sync(dev);
	mutex_unlock(&lis3->mutex);
}

static inline void lis302dl_data_ready(struct lis3lv02d *lis3, int index)
{
	int dummy;

	/* Dummy read to ack interrupt */
	lis3lv02d_get_xyz(lis3, &dummy, &dummy, &dummy);
	lis3->data_ready_count[index]++;
}

static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
{
	struct lis3lv02d *lis3 = data;
	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ1_MASK;

	if (irq_cfg == LIS3_IRQ1_CLICK)
		lis302dl_interrupt_handle_click(lis3);
	else if (unlikely(irq_cfg == LIS3_IRQ1_DATA_READY))
		lis302dl_data_ready(lis3, IRQ_LINE0);
	else
		lis3lv02d_joystick_poll(lis3->idev);

	return IRQ_HANDLED;
}

static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
{
	struct lis3lv02d *lis3 = data;
	u8 irq_cfg = lis3->irq_cfg & LIS3_IRQ2_MASK;

	if (irq_cfg == LIS3_IRQ2_CLICK)
		lis302dl_interrupt_handle_click(lis3);
	else if (unlikely(irq_cfg == LIS3_IRQ2_DATA_READY))
		lis302dl_data_ready(lis3, IRQ_LINE1);
	else
		lis3lv02d_joystick_poll(lis3->idev);

	return IRQ_HANDLED;
}

static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
{
	struct lis3lv02d *lis3 = container_of(file->private_data,
					      struct lis3lv02d, miscdev);

	if (test_and_set_bit(0, &lis3->misc_opened))
		return -EBUSY; /* already open */

	if (lis3->pm_dev)
		pm_runtime_get_sync(lis3->pm_dev);

	atomic_set(&lis3->count, 0);
	return 0;
}

static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
{
	struct lis3lv02d *lis3 = container_of(file->private_data,
					      struct lis3lv02d, miscdev);

	clear_bit(0, &lis3->misc_opened); /* release the device */
	if (lis3->pm_dev)
		pm_runtime_put(lis3->pm_dev);
	return 0;
}

static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf,
				size_t count, loff_t *pos)
{
	struct lis3lv02d *lis3 = container_of(file->private_data,
					      struct lis3lv02d, miscdev);

	DECLARE_WAITQUEUE(wait, current);
	u32 data;
	unsigned char byte_data;
	ssize_t retval = 1;

	if (count < 1)
		return -EINVAL;

	add_wait_queue(&lis3->misc_wait, &wait);
	while (true) {
		set_current_state(TASK_INTERRUPTIBLE);
		data = atomic_xchg(&lis3->count, 0);
		if (data)
			break;

		if (file->f_flags & O_NONBLOCK) {
			retval = -EAGAIN;
			goto out;
		}

		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			goto out;
		}

		schedule();
	}

	if (data < 255)
		byte_data = data;
	else
		byte_data = 255;

	/* make sure we are not going into copy_to_user() with
	 * TASK_INTERRUPTIBLE state */
	set_current_state(TASK_RUNNING);
	if (copy_to_user(buf, &byte_data, sizeof(byte_data)))
		retval = -EFAULT;

out:
	__set_current_state(TASK_RUNNING);
	remove_wait_queue(&lis3->misc_wait, &wait);

	return retval;
}

static __poll_t lis3lv02d_misc_poll(struct file *file, poll_table *wait)
{
	struct lis3lv02d *lis3 = container_of(file->private_data,
					      struct lis3lv02d, miscdev);

	poll_wait(file, &lis3->misc_wait, wait);
	if (atomic_read(&lis3->count))
		return EPOLLIN | EPOLLRDNORM;
	return 0;
}

static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
{
	struct lis3lv02d *lis3 = container_of(file->private_data,
					      struct lis3lv02d, miscdev);

	return fasync_helper(fd, file, on, &lis3->async_queue);
}

static const struct file_operations lis3lv02d_misc_fops = {
	.owner   = THIS_MODULE,
	.llseek  = no_llseek,
	.read    = lis3lv02d_misc_read,
	.open    = lis3lv02d_misc_open,
	.release = lis3lv02d_misc_release,
	.poll    = lis3lv02d_misc_poll,
	.fasync  = lis3lv02d_misc_fasync,
};

int lis3lv02d_joystick_enable(struct lis3lv02d *lis3)
{
	struct input_dev *input_dev;
	int err;
	int max_val, fuzz, flat;
	int btns[] = {BTN_X, BTN_Y, BTN_Z};

	if (lis3->idev)
		return -EINVAL;

	input_dev = input_allocate_device();
	if (!input_dev)
		return -ENOMEM;

	input_dev->name       = "ST LIS3LV02DL Accelerometer";
	input_dev->phys       = DRIVER_NAME "/input0";
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor  = 0;
	input_dev->dev.parent = &lis3->pdev->dev;

	input_dev->open = lis3lv02d_joystick_open;
	input_dev->close = lis3lv02d_joystick_close;

	max_val = (lis3->mdps_max_val * lis3->scale) / LIS3_ACCURACY;
	if (lis3->whoami == WAI_12B) {
		fuzz = LIS3_DEFAULT_FUZZ_12B;
		flat = LIS3_DEFAULT_FLAT_12B;
	} else {
		fuzz = LIS3_DEFAULT_FUZZ_8B;
		flat = LIS3_DEFAULT_FLAT_8B;
	}
	fuzz = (fuzz * lis3->scale) / LIS3_ACCURACY;
	flat = (flat * lis3->scale) / LIS3_ACCURACY;

	input_set_abs_params(input_dev, ABS_X, -max_val, max_val, fuzz, flat);
	input_set_abs_params(input_dev, ABS_Y, -max_val, max_val, fuzz, flat);
	input_set_abs_params(input_dev, ABS_Z, -max_val, max_val, fuzz, flat);

	input_set_drvdata(input_dev, lis3);
	lis3->idev = input_dev;

	err = input_setup_polling(input_dev, lis3lv02d_joystick_poll);
	if (err)
		goto err_free_input;

	input_set_poll_interval(input_dev, MDPS_POLL_INTERVAL);
	input_set_min_poll_interval(input_dev, MDPS_POLL_MIN);
	input_set_max_poll_interval(input_dev, MDPS_POLL_MAX);

	lis3->mapped_btns[0] = lis3lv02d_get_axis(abs(lis3->ac.x), btns);
	lis3->mapped_btns[1] = lis3lv02d_get_axis(abs(lis3->ac.y), btns);
	lis3->mapped_btns[2] = lis3lv02d_get_axis(abs(lis3->ac.z), btns);

	err = input_register_device(lis3->idev);
	if (err)
		goto err_free_input;

	return 0;

err_free_input:
	input_free_device(input_dev);
	lis3->idev = NULL;
	return err;

}
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);

void lis3lv02d_joystick_disable(struct lis3lv02d *lis3)
{
	if (lis3->irq)
		free_irq(lis3->irq, lis3);
	if (lis3->pdata && lis3->pdata->irq2)
		free_irq(lis3->pdata->irq2, lis3);

	if (!lis3->idev)
		return;

	if (lis3->irq)
		misc_deregister(&lis3->miscdev);
	input_unregister_device(lis3->idev);
	lis3->idev = NULL;
}
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);

/* Sysfs stuff */
static void lis3lv02d_sysfs_poweron(struct lis3lv02d *lis3)
{
	/*
	 * SYSFS functions are fast visitors so put-call
	 * immediately after the get-call. However, keep
	 * chip running for a while and schedule delayed
	 * suspend. This way periodic sysfs calls doesn't
	 * suffer from relatively long power up time.
	 */

	if (lis3->pm_dev) {
		pm_runtime_get_sync(lis3->pm_dev);
		pm_runtime_put_noidle(lis3->pm_dev);
		pm_schedule_suspend(lis3->pm_dev, LIS3_SYSFS_POWERDOWN_DELAY);
	}
}

static ssize_t lis3lv02d_selftest_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
	s16 values[3];

	static const char ok[] = "OK";
	static const char fail[] = "FAIL";
	static const char irq[] = "FAIL_IRQ";
	const char *res;

	lis3lv02d_sysfs_poweron(lis3);
	switch (lis3lv02d_selftest(lis3, values)) {
	case SELFTEST_FAIL:
		res = fail;
		break;
	case SELFTEST_IRQ:
		res = irq;
		break;
	case SELFTEST_OK:
	default:
		res = ok;
		break;
	}
	return sprintf(buf, "%s %d %d %d\n", res,
		values[0], values[1], values[2]);
}

static ssize_t lis3lv02d_position_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
	int x, y, z;

	lis3lv02d_sysfs_poweron(lis3);
	mutex_lock(&lis3->mutex);
	lis3lv02d_get_xyz(lis3, &x, &y, &z);
	mutex_unlock(&lis3->mutex);
	return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
}

static ssize_t lis3lv02d_rate_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
	int odr_idx;

	lis3lv02d_sysfs_poweron(lis3);

	odr_idx = lis3lv02d_get_odr_index(lis3);
	return sprintf(buf, "%d\n", lis3->odrs[odr_idx]);
}

static ssize_t lis3lv02d_rate_set(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
{
	struct lis3lv02d *lis3 = dev_get_drvdata(dev);
	unsigned long rate;
	int ret;

	ret = kstrtoul(buf, 0, &rate);
	if (ret)
		return ret;

	lis3lv02d_sysfs_poweron(lis3);
	if (lis3lv02d_set_odr(lis3, rate))
		return -EINVAL;

	return count;
}

static DEVICE_ATTR(selftest, S_IRUSR, lis3lv02d_selftest_show, NULL);
static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
					    lis3lv02d_rate_set);

static struct attribute *lis3lv02d_attributes[] = {
	&dev_attr_selftest.attr,
	&dev_attr_position.attr,
	&dev_attr_rate.attr,
	NULL
};

static const struct attribute_group lis3lv02d_attribute_group = {
	.attrs = lis3lv02d_attributes
};


static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
{
	lis3->pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
	if (IS_ERR(lis3->pdev))
		return PTR_ERR(lis3->pdev);

	platform_set_drvdata(lis3->pdev, lis3);
	return sysfs_create_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
}

int lis3lv02d_remove_fs(struct lis3lv02d *lis3)
{
	sysfs_remove_group(&lis3->pdev->dev.kobj, &lis3lv02d_attribute_group);
	platform_device_unregister(lis3->pdev);
	if (lis3->pm_dev) {
		/* Barrier after the sysfs remove */
		pm_runtime_barrier(lis3->pm_dev);

		/* SYSFS may have left chip running. Turn off if necessary */
		if (!pm_runtime_suspended(lis3->pm_dev))
			lis3lv02d_poweroff(lis3);

		pm_runtime_disable(lis3->pm_dev);
		pm_runtime_set_suspended(lis3->pm_dev);
	}
	kfree(lis3->reg_cache);
	return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);

static void lis3lv02d_8b_configure(struct lis3lv02d *lis3,
				struct lis3lv02d_platform_data *p)
{
	int err;
	int ctrl2 = p->hipass_ctrl;

	if (p->click_flags) {
		lis3->write(lis3, CLICK_CFG, p->click_flags);
		lis3->write(lis3, CLICK_TIMELIMIT, p->click_time_limit);
		lis3->write(lis3, CLICK_LATENCY, p->click_latency);
		lis3->write(lis3, CLICK_WINDOW, p->click_window);
		lis3->write(lis3, CLICK_THSZ, p->click_thresh_z & 0xf);
		lis3->write(lis3, CLICK_THSY_X,
			(p->click_thresh_x & 0xf) |
			(p->click_thresh_y << 4));

		if (lis3->idev) {
			input_set_capability(lis3->idev, EV_KEY, BTN_X);
			input_set_capability(lis3->idev, EV_KEY, BTN_Y);
			input_set_capability(lis3->idev, EV_KEY, BTN_Z);
		}
	}

	if (p->wakeup_flags) {
		lis3->write(lis3, FF_WU_CFG_1, p->wakeup_flags);
		lis3->write(lis3, FF_WU_THS_1, p->wakeup_thresh & 0x7f);
		/* pdata value + 1 to keep this backward compatible*/
		lis3->write(lis3, FF_WU_DURATION_1, p->duration1 + 1);
		ctrl2 ^= HP_FF_WU1; /* Xor to keep compatible with old pdata*/
	}

	if (p->wakeup_flags2) {
		lis3->write(lis3, FF_WU_CFG_2, p->wakeup_flags2);
		lis3->write(lis3, FF_WU_THS_2, p->wakeup_thresh2 & 0x7f);
		/* pdata value + 1 to keep this backward compatible*/
		lis3->write(lis3, FF_WU_DURATION_2, p->duration2 + 1);
		ctrl2 ^= HP_FF_WU2; /* Xor to keep compatible with old pdata*/
	}
	/* Configure hipass filters */
	lis3->write(lis3, CTRL_REG2, ctrl2);

	if (p->irq2) {
		err = request_threaded_irq(p->irq2,
					NULL,
					lis302dl_interrupt_thread2_8b,
					IRQF_TRIGGER_RISING | IRQF_ONESHOT |
					(p->irq_flags2 & IRQF_TRIGGER_MASK),
					DRIVER_NAME, lis3);
		if (err < 0)
			pr_err("No second IRQ. Limited functionality\n");
	}
}

#ifdef CONFIG_OF
int lis3lv02d_init_dt(struct lis3lv02d *lis3)
{
	struct lis3lv02d_platform_data *pdata;
	struct device_node *np = lis3->of_node;
	u32 val;
	s32 sval;

	if (!lis3->of_node)
		return 0;

	pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;

	if (of_get_property(np, "st,click-single-x", NULL))
		pdata->click_flags |= LIS3_CLICK_SINGLE_X;
	if (of_get_property(np, "st,click-double-x", NULL))
		pdata->click_flags |= LIS3_CLICK_DOUBLE_X;

	if (of_get_property(np, "st,click-single-y", NULL))
		pdata->click_flags |= LIS3_CLICK_SINGLE_Y;
	if (of_get_property(np, "st,click-double-y", NULL))
		pdata->click_flags |= LIS3_CLICK_DOUBLE_Y;

	if (of_get_property(np, "st,click-single-z", NULL))
		pdata->click_flags |= LIS3_CLICK_SINGLE_Z;
	if (of_get_property(np, "st,click-double-z", NULL))
		pdata->click_flags |= LIS3_CLICK_DOUBLE_Z;

	if (!of_property_read_u32(np, "st,click-threshold-x", &val))
		pdata->click_thresh_x = val;
	if (!of_property_read_u32(np, "st,click-threshold-y", &val))
		pdata->click_thresh_y = val;
	if (!of_property_read_u32(np, "st,click-threshold-z", &val))
		pdata->click_thresh_z = val;

	if (!of_property_read_u32(np, "st,click-time-limit", &val))
		pdata->click_time_limit = val;
	if (!of_property_read_u32(np, "st,click-latency", &val))
		pdata->click_latency = val;
	if (!of_property_read_u32(np, "st,click-window", &val))
		pdata->click_window = val;

	if (of_get_property(np, "st,irq1-disable", NULL))
		pdata->irq_cfg |= LIS3_IRQ1_DISABLE;
	if (of_get_property(np, "st,irq1-ff-wu-1", NULL))
		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_1;
	if (of_get_property(np, "st,irq1-ff-wu-2", NULL))
		pdata->irq_cfg |= LIS3_IRQ1_FF_WU_2;
	if (of_get_property(np, "st,irq1-data-ready", NULL))
		pdata->irq_cfg |= LIS3_IRQ1_DATA_READY;
	if (of_get_property(np, "st,irq1-click", NULL))
		pdata->irq_cfg |= LIS3_IRQ1_CLICK;

	if (of_get_property(np, "st,irq2-disable", NULL))
		pdata->irq_cfg |= LIS3_IRQ2_DISABLE;
	if (of_get_property(np, "st,irq2-ff-wu-1", NULL))
		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_1;
	if (of_get_property(np, "st,irq2-ff-wu-2", NULL))
		pdata->irq_cfg |= LIS3_IRQ2_FF_WU_2;
	if (of_get_property(np, "st,irq2-data-ready", NULL))
		pdata->irq_cfg |= LIS3_IRQ2_DATA_READY;
	if (of_get_property(np, "st,irq2-click", NULL))
		pdata->irq_cfg |= LIS3_IRQ2_CLICK;

	if (of_get_property(np, "st,irq-open-drain", NULL))
		pdata->irq_cfg |= LIS3_IRQ_OPEN_DRAIN;
	if (of_get_property(np, "st,irq-active-low", NULL))
		pdata->irq_cfg |= LIS3_IRQ_ACTIVE_LOW;

	if (!of_property_read_u32(np, "st,wu-duration-1", &val))
		pdata->duration1 = val;
	if (!of_property_read_u32(np, "st,wu-duration-2", &val))
		pdata->duration2 = val;

	if (of_get_property(np, "st,wakeup-x-lo", NULL))
		pdata->wakeup_flags |= LIS3_WAKEUP_X_LO;
	if (of_get_property(np, "st,wakeup-x-hi", NULL))
		pdata->wakeup_flags |= LIS3_WAKEUP_X_HI;
	if (of_get_property(np, "st,wakeup-y-lo", NULL))
		pdata->wakeup_flags |= LIS3_WAKEUP_Y_LO;
	if (of_get_property(np, "st,wakeup-y-hi", NULL))
		pdata->wakeup_flags |= LIS3_WAKEUP_Y_HI;
	if (of_get_property(np, "st,wakeup-z-lo", NULL))
		pdata->wakeup_flags |= LIS3_WAKEUP_Z_LO;
	if (of_get_property(np, "st,wakeup-z-hi", NULL))
		pdata->wakeup_flags |= LIS3_WAKEUP_Z_HI;
	if (of_get_property(np, "st,wakeup-threshold", &val))
		pdata->wakeup_thresh = val;

	if (of_get_property(np, "st,wakeup2-x-lo", NULL))
		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_LO;
	if (of_get_property(np, "st,wakeup2-x-hi", NULL))
		pdata->wakeup_flags2 |= LIS3_WAKEUP_X_HI;
	if (of_get_property(np, "st,wakeup2-y-lo", NULL))
		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_LO;
	if (of_get_property(np, "st,wakeup2-y-hi", NULL))
		pdata->wakeup_flags2 |= LIS3_WAKEUP_Y_HI;
	if (of_get_property(np, "st,wakeup2-z-lo", NULL))
		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_LO;
	if (of_get_property(np, "st,wakeup2-z-hi", NULL))
		pdata->wakeup_flags2 |= LIS3_WAKEUP_Z_HI;
	if (of_get_property(np, "st,wakeup2-threshold", &val))
		pdata->wakeup_thresh2 = val;

	if (!of_property_read_u32(np, "st,highpass-cutoff-hz", &val)) {
		switch (val) {
		case 1:
			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_1HZ;
			break;
		case 2:
			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_2HZ;
			break;
		case 4:
			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_4HZ;
			break;
		case 8:
			pdata->hipass_ctrl = LIS3_HIPASS_CUTFF_8HZ;
			break;
		}
	}

	if (of_get_property(np, "st,hipass1-disable", NULL))
		pdata->hipass_ctrl |= LIS3_HIPASS1_DISABLE;
	if (of_get_property(np, "st,hipass2-disable", NULL))
		pdata->hipass_ctrl |= LIS3_HIPASS2_DISABLE;

	if (of_property_read_s32(np, "st,axis-x", &sval) == 0)
		pdata->axis_x = sval;
	if (of_property_read_s32(np, "st,axis-y", &sval) == 0)
		pdata->axis_y = sval;
	if (of_property_read_s32(np, "st,axis-z", &sval) == 0)
		pdata->axis_z = sval;

	if (of_get_property(np, "st,default-rate", NULL))
		pdata->default_rate = val;

	if (of_property_read_s32(np, "st,min-limit-x", &sval) == 0)
		pdata->st_min_limits[0] = sval;
	if (of_property_read_s32(np, "st,min-limit-y", &sval) == 0)
		pdata->st_min_limits[1] = sval;
	if (of_property_read_s32(np, "st,min-limit-z", &sval) == 0)
		pdata->st_min_limits[2] = sval;

	if (of_property_read_s32(np, "st,max-limit-x", &sval) == 0)
		pdata->st_max_limits[0] = sval;
	if (of_property_read_s32(np, "st,max-limit-y", &sval) == 0)
		pdata->st_max_limits[1] = sval;
	if (of_property_read_s32(np, "st,max-limit-z", &sval) == 0)
		pdata->st_max_limits[2] = sval;


	lis3->pdata = pdata;

	return 0;
}

#else
int lis3lv02d_init_dt(struct lis3lv02d *lis3)
{
	return 0;
}
#endif
EXPORT_SYMBOL_GPL(lis3lv02d_init_dt);

/*
 * Initialise the accelerometer and the various subsystems.
 * Should be rather independent of the bus system.
 */
int lis3lv02d_init_device(struct lis3lv02d *lis3)
{
	int err;
	irq_handler_t thread_fn;
	int irq_flags = 0;

	lis3->whoami = lis3lv02d_read_8(lis3, WHO_AM_I);

	switch (lis3->whoami) {
	case WAI_12B:
		pr_info("12 bits sensor found\n");
		lis3->read_data = lis3lv02d_read_12;
		lis3->mdps_max_val = 2048;
		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
		lis3->odrs = lis3_12_rates;
		lis3->odr_mask = CTRL1_DF0 | CTRL1_DF1;
		lis3->scale = LIS3_SENSITIVITY_12B;
		lis3->regs = lis3_wai12_regs;
		lis3->regs_size = ARRAY_SIZE(lis3_wai12_regs);
		break;
	case WAI_8B:
		pr_info("8 bits sensor found\n");
		lis3->read_data = lis3lv02d_read_8;
		lis3->mdps_max_val = 128;
		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
		lis3->odrs = lis3_8_rates;
		lis3->odr_mask = CTRL1_DR;
		lis3->scale = LIS3_SENSITIVITY_8B;
		lis3->regs = lis3_wai8_regs;
		lis3->regs_size = ARRAY_SIZE(lis3_wai8_regs);
		break;
	case WAI_3DC:
		pr_info("8 bits 3DC sensor found\n");
		lis3->read_data = lis3lv02d_read_8;
		lis3->mdps_max_val = 128;
		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
		lis3->odrs = lis3_3dc_rates;
		lis3->odr_mask = CTRL1_ODR0|CTRL1_ODR1|CTRL1_ODR2|CTRL1_ODR3;
		lis3->scale = LIS3_SENSITIVITY_8B;
		break;
	case WAI_3DLH:
		pr_info("16 bits lis331dlh sensor found\n");
		lis3->read_data = lis331dlh_read_data;
		lis3->mdps_max_val = 2048; /* 12 bits for 2G */
		lis3->shift_adj = SHIFT_ADJ_2G;
		lis3->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
		lis3->odrs = lis3_3dlh_rates;
		lis3->odr_mask = CTRL1_DR0 | CTRL1_DR1;
		lis3->scale = LIS3DLH_SENSITIVITY_2G;
		break;
	default:
		pr_err("unknown sensor type 0x%X\n", lis3->whoami);
		return -ENODEV;
	}

	lis3->reg_cache = kzalloc(max(sizeof(lis3_wai8_regs),
				     sizeof(lis3_wai12_regs)), GFP_KERNEL);

	if (lis3->reg_cache == NULL)
		return -ENOMEM;

	mutex_init(&lis3->mutex);
	atomic_set(&lis3->wake_thread, 0);

	lis3lv02d_add_fs(lis3);
	err = lis3lv02d_poweron(lis3);
	if (err) {
		lis3lv02d_remove_fs(lis3);
		return err;
	}

	if (lis3->pm_dev) {
		pm_runtime_set_active(lis3->pm_dev);
		pm_runtime_enable(lis3->pm_dev);
	}

	if (lis3lv02d_joystick_enable(lis3))
		pr_err("joystick initialization failed\n");

	/* passing in platform specific data is purely optional and only
	 * used by the SPI transport layer at the moment */
	if (lis3->pdata) {
		struct lis3lv02d_platform_data *p = lis3->pdata;

		if (lis3->whoami == WAI_8B)
			lis3lv02d_8b_configure(lis3, p);

		irq_flags = p->irq_flags1 & IRQF_TRIGGER_MASK;

		lis3->irq_cfg = p->irq_cfg;
		if (p->irq_cfg)
			lis3->write(lis3, CTRL_REG3, p->irq_cfg);

		if (p->default_rate)
			lis3lv02d_set_odr(lis3, p->default_rate);
	}

	/* bail if we did not get an IRQ from the bus layer */
	if (!lis3->irq) {
		pr_debug("No IRQ. Disabling /dev/freefall\n");
		goto out;
	}

	/*
	 * The sensor can generate interrupts for free-fall and direction
	 * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
	 * the things simple and _fast_ we activate it only for free-fall, so
	 * no need to read register (very slow with ACPI). For the same reason,
	 * we forbid shared interrupts.
	 *
	 * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
	 * io-apic is not configurable (and generates a warning) but I keep it
	 * in case of support for other hardware.
	 */
	if (lis3->pdata && lis3->whoami == WAI_8B)
		thread_fn = lis302dl_interrupt_thread1_8b;
	else
		thread_fn = NULL;

	err = request_threaded_irq(lis3->irq, lis302dl_interrupt,
				thread_fn,
				IRQF_TRIGGER_RISING | IRQF_ONESHOT |
				irq_flags,
				DRIVER_NAME, lis3);

	if (err < 0) {
		pr_err("Cannot get IRQ\n");
		goto out;
	}

	lis3->miscdev.minor	= MISC_DYNAMIC_MINOR;
	lis3->miscdev.name	= "freefall";
	lis3->miscdev.fops	= &lis3lv02d_misc_fops;

	if (misc_register(&lis3->miscdev))
		pr_err("misc_register failed\n");
out:
	return 0;
}
EXPORT_SYMBOL_GPL(lis3lv02d_init_device);

MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
MODULE_LICENSE("GPL");