xref: /openbmc/linux/drivers/iio/imu/kmx61.c (revision abfbd895)
1 /*
2  * KMX61 - Kionix 6-axis Accelerometer/Magnetometer
3  *
4  * Copyright (c) 2014, Intel Corporation.
5  *
6  * This file is subject to the terms and conditions of version 2 of
7  * the GNU General Public License.  See the file COPYING in the main
8  * directory of this archive for more details.
9  *
10  * IIO driver for KMX61 (7-bit I2C slave address 0x0E or 0x0F).
11  *
12  */
13 
14 #include <linux/module.h>
15 #include <linux/i2c.h>
16 #include <linux/acpi.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/interrupt.h>
19 #include <linux/pm.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/events.h>
24 #include <linux/iio/trigger.h>
25 #include <linux/iio/buffer.h>
26 #include <linux/iio/triggered_buffer.h>
27 #include <linux/iio/trigger_consumer.h>
28 
29 #define KMX61_DRV_NAME "kmx61"
30 #define KMX61_IRQ_NAME "kmx61_event"
31 
32 #define KMX61_REG_WHO_AM_I	0x00
33 #define KMX61_REG_INS1		0x01
34 #define KMX61_REG_INS2		0x02
35 
36 /*
37  * three 16-bit accelerometer output registers for X/Y/Z axis
38  * we use only XOUT_L as a base register, all other addresses
39  * can be obtained by applying an offset and are provided here
40  * only for clarity.
41  */
42 #define KMX61_ACC_XOUT_L	0x0A
43 #define KMX61_ACC_XOUT_H	0x0B
44 #define KMX61_ACC_YOUT_L	0x0C
45 #define KMX61_ACC_YOUT_H	0x0D
46 #define KMX61_ACC_ZOUT_L	0x0E
47 #define KMX61_ACC_ZOUT_H	0x0F
48 
49 /*
50  * one 16-bit temperature output register
51  */
52 #define KMX61_TEMP_L		0x10
53 #define KMX61_TEMP_H		0x11
54 
55 /*
56  * three 16-bit magnetometer output registers for X/Y/Z axis
57  */
58 #define KMX61_MAG_XOUT_L	0x12
59 #define KMX61_MAG_XOUT_H	0x13
60 #define KMX61_MAG_YOUT_L	0x14
61 #define KMX61_MAG_YOUT_H	0x15
62 #define KMX61_MAG_ZOUT_L	0x16
63 #define KMX61_MAG_ZOUT_H	0x17
64 
65 #define KMX61_REG_INL		0x28
66 #define KMX61_REG_STBY		0x29
67 #define KMX61_REG_CTRL1		0x2A
68 #define KMX61_REG_CTRL2		0x2B
69 #define KMX61_REG_ODCNTL	0x2C
70 #define KMX61_REG_INC1		0x2D
71 
72 #define KMX61_REG_WUF_THRESH	0x3D
73 #define KMX61_REG_WUF_TIMER	0x3E
74 
75 #define KMX61_ACC_STBY_BIT	BIT(0)
76 #define KMX61_MAG_STBY_BIT	BIT(1)
77 #define KMX61_ACT_STBY_BIT	BIT(7)
78 
79 #define KMX61_ALL_STBY		(KMX61_ACC_STBY_BIT | KMX61_MAG_STBY_BIT)
80 
81 #define KMX61_REG_INS1_BIT_WUFS		BIT(1)
82 
83 #define KMX61_REG_INS2_BIT_ZP		BIT(0)
84 #define KMX61_REG_INS2_BIT_ZN		BIT(1)
85 #define KMX61_REG_INS2_BIT_YP		BIT(2)
86 #define KMX61_REG_INS2_BIT_YN		BIT(3)
87 #define KMX61_REG_INS2_BIT_XP		BIT(4)
88 #define KMX61_REG_INS2_BIT_XN		BIT(5)
89 
90 #define KMX61_REG_CTRL1_GSEL_MASK	0x03
91 
92 #define KMX61_REG_CTRL1_BIT_RES		BIT(4)
93 #define KMX61_REG_CTRL1_BIT_DRDYE	BIT(5)
94 #define KMX61_REG_CTRL1_BIT_WUFE	BIT(6)
95 #define KMX61_REG_CTRL1_BIT_BTSE	BIT(7)
96 
97 #define KMX61_REG_INC1_BIT_WUFS		BIT(0)
98 #define KMX61_REG_INC1_BIT_DRDYM	BIT(1)
99 #define KMX61_REG_INC1_BIT_DRDYA	BIT(2)
100 #define KMX61_REG_INC1_BIT_IEN		BIT(5)
101 
102 #define KMX61_ACC_ODR_SHIFT	0
103 #define KMX61_MAG_ODR_SHIFT	4
104 #define KMX61_ACC_ODR_MASK	0x0F
105 #define KMX61_MAG_ODR_MASK	0xF0
106 
107 #define KMX61_OWUF_MASK		0x7
108 
109 #define KMX61_DEFAULT_WAKE_THRESH	1
110 #define KMX61_DEFAULT_WAKE_DURATION	1
111 
112 #define KMX61_SLEEP_DELAY_MS	2000
113 
114 #define KMX61_CHIP_ID		0x12
115 
116 /* KMX61 devices */
117 #define KMX61_ACC	0x01
118 #define KMX61_MAG	0x02
119 
120 struct kmx61_data {
121 	struct i2c_client *client;
122 
123 	/* serialize access to non-atomic ops, e.g set_mode */
124 	struct mutex lock;
125 
126 	/* standby state */
127 	bool acc_stby;
128 	bool mag_stby;
129 
130 	/* power state */
131 	bool acc_ps;
132 	bool mag_ps;
133 
134 	/* config bits */
135 	u8 range;
136 	u8 odr_bits;
137 	u8 wake_thresh;
138 	u8 wake_duration;
139 
140 	/* accelerometer specific data */
141 	struct iio_dev *acc_indio_dev;
142 	struct iio_trigger *acc_dready_trig;
143 	struct iio_trigger *motion_trig;
144 	bool acc_dready_trig_on;
145 	bool motion_trig_on;
146 	bool ev_enable_state;
147 
148 	/* magnetometer specific data */
149 	struct iio_dev *mag_indio_dev;
150 	struct iio_trigger *mag_dready_trig;
151 	bool mag_dready_trig_on;
152 };
153 
154 enum kmx61_range {
155 	KMX61_RANGE_2G,
156 	KMX61_RANGE_4G,
157 	KMX61_RANGE_8G,
158 };
159 
160 enum kmx61_axis {
161 	KMX61_AXIS_X,
162 	KMX61_AXIS_Y,
163 	KMX61_AXIS_Z,
164 };
165 
166 static const u16 kmx61_uscale_table[] = {9582, 19163, 38326};
167 
168 static const struct {
169 	int val;
170 	int val2;
171 } kmx61_samp_freq_table[] = { {12, 500000},
172 			{25, 0},
173 			{50, 0},
174 			{100, 0},
175 			{200, 0},
176 			{400, 0},
177 			{800, 0},
178 			{1600, 0},
179 			{0, 781000},
180 			{1, 563000},
181 			{3, 125000},
182 			{6, 250000} };
183 
184 static const struct {
185 	int val;
186 	int val2;
187 	int odr_bits;
188 } kmx61_wake_up_odr_table[] = { {0, 781000, 0x00},
189 				 {1, 563000, 0x01},
190 				 {3, 125000, 0x02},
191 				 {6, 250000, 0x03},
192 				 {12, 500000, 0x04},
193 				 {25, 0, 0x05},
194 				 {50, 0, 0x06},
195 				 {100, 0, 0x06},
196 				 {200, 0, 0x06},
197 				 {400, 0, 0x06},
198 				 {800, 0, 0x06},
199 				 {1600, 0, 0x06} };
200 
201 static IIO_CONST_ATTR(accel_scale_available, "0.009582 0.019163 0.038326");
202 static IIO_CONST_ATTR(magn_scale_available, "0.001465");
203 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
204 	"0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800");
205 
206 static struct attribute *kmx61_acc_attributes[] = {
207 	&iio_const_attr_accel_scale_available.dev_attr.attr,
208 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
209 	NULL,
210 };
211 
212 static struct attribute *kmx61_mag_attributes[] = {
213 	&iio_const_attr_magn_scale_available.dev_attr.attr,
214 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
215 	NULL,
216 };
217 
218 static const struct attribute_group kmx61_acc_attribute_group = {
219 	.attrs = kmx61_acc_attributes,
220 };
221 
222 static const struct attribute_group kmx61_mag_attribute_group = {
223 	.attrs = kmx61_mag_attributes,
224 };
225 
226 static const struct iio_event_spec kmx61_event = {
227 	.type = IIO_EV_TYPE_THRESH,
228 	.dir = IIO_EV_DIR_EITHER,
229 	.mask_separate = BIT(IIO_EV_INFO_VALUE) |
230 			 BIT(IIO_EV_INFO_ENABLE) |
231 			 BIT(IIO_EV_INFO_PERIOD),
232 };
233 
234 #define KMX61_ACC_CHAN(_axis) { \
235 	.type = IIO_ACCEL, \
236 	.modified = 1, \
237 	.channel2 = IIO_MOD_ ## _axis, \
238 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
239 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
240 				BIT(IIO_CHAN_INFO_SAMP_FREQ), \
241 	.address = KMX61_ACC, \
242 	.scan_index = KMX61_AXIS_ ## _axis, \
243 	.scan_type = { \
244 		.sign = 's', \
245 		.realbits = 12, \
246 		.storagebits = 16, \
247 		.shift = 4, \
248 		.endianness = IIO_LE, \
249 	}, \
250 	.event_spec = &kmx61_event, \
251 	.num_event_specs = 1 \
252 }
253 
254 #define KMX61_MAG_CHAN(_axis) { \
255 	.type = IIO_MAGN, \
256 	.modified = 1, \
257 	.channel2 = IIO_MOD_ ## _axis, \
258 	.address = KMX61_MAG, \
259 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
260 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
261 				BIT(IIO_CHAN_INFO_SAMP_FREQ), \
262 	.scan_index = KMX61_AXIS_ ## _axis, \
263 	.scan_type = { \
264 		.sign = 's', \
265 		.realbits = 14, \
266 		.storagebits = 16, \
267 		.shift = 2, \
268 		.endianness = IIO_LE, \
269 	}, \
270 }
271 
272 static const struct iio_chan_spec kmx61_acc_channels[] = {
273 	KMX61_ACC_CHAN(X),
274 	KMX61_ACC_CHAN(Y),
275 	KMX61_ACC_CHAN(Z),
276 };
277 
278 static const struct iio_chan_spec kmx61_mag_channels[] = {
279 	KMX61_MAG_CHAN(X),
280 	KMX61_MAG_CHAN(Y),
281 	KMX61_MAG_CHAN(Z),
282 };
283 
284 static void kmx61_set_data(struct iio_dev *indio_dev, struct kmx61_data *data)
285 {
286 	struct kmx61_data **priv = iio_priv(indio_dev);
287 
288 	*priv = data;
289 }
290 
291 static struct kmx61_data *kmx61_get_data(struct iio_dev *indio_dev)
292 {
293 	return *(struct kmx61_data **)iio_priv(indio_dev);
294 }
295 
296 static int kmx61_convert_freq_to_bit(int val, int val2)
297 {
298 	int i;
299 
300 	for (i = 0; i < ARRAY_SIZE(kmx61_samp_freq_table); i++)
301 		if (val == kmx61_samp_freq_table[i].val &&
302 		    val2 == kmx61_samp_freq_table[i].val2)
303 			return i;
304 	return -EINVAL;
305 }
306 
307 static int kmx61_convert_wake_up_odr_to_bit(int val, int val2)
308 {
309 	int i;
310 
311 	for (i = 0; i < ARRAY_SIZE(kmx61_wake_up_odr_table); ++i)
312 		if (kmx61_wake_up_odr_table[i].val == val &&
313 			kmx61_wake_up_odr_table[i].val2 == val2)
314 				return kmx61_wake_up_odr_table[i].odr_bits;
315 	return -EINVAL;
316 }
317 
318 /**
319  * kmx61_set_mode() - set KMX61 device operating mode
320  * @data - kmx61 device private data pointer
321  * @mode - bitmask, indicating operating mode for @device
322  * @device - bitmask, indicating device for which @mode needs to be set
323  * @update - update stby bits stored in device's private  @data
324  *
325  * For each sensor (accelerometer/magnetometer) there are two operating modes
326  * STANDBY and OPERATION. Neither accel nor magn can be disabled independently
327  * if they are both enabled. Internal sensors state is saved in acc_stby and
328  * mag_stby members of driver's private @data.
329  */
330 static int kmx61_set_mode(struct kmx61_data *data, u8 mode, u8 device,
331 			  bool update)
332 {
333 	int ret;
334 	int acc_stby = -1, mag_stby = -1;
335 
336 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_STBY);
337 	if (ret < 0) {
338 		dev_err(&data->client->dev, "Error reading reg_stby\n");
339 		return ret;
340 	}
341 	if (device & KMX61_ACC) {
342 		if (mode & KMX61_ACC_STBY_BIT) {
343 			ret |= KMX61_ACC_STBY_BIT;
344 			acc_stby = 1;
345 		} else {
346 			ret &= ~KMX61_ACC_STBY_BIT;
347 			acc_stby = 0;
348 		}
349 	}
350 
351 	if (device & KMX61_MAG) {
352 		if (mode & KMX61_MAG_STBY_BIT) {
353 			ret |= KMX61_MAG_STBY_BIT;
354 			mag_stby = 1;
355 		} else {
356 			ret &= ~KMX61_MAG_STBY_BIT;
357 			mag_stby = 0;
358 		}
359 	}
360 
361 	if (mode & KMX61_ACT_STBY_BIT)
362 		ret |= KMX61_ACT_STBY_BIT;
363 
364 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_STBY, ret);
365 	if (ret < 0) {
366 		dev_err(&data->client->dev, "Error writing reg_stby\n");
367 		return ret;
368 	}
369 
370 	if (acc_stby != -1 && update)
371 		data->acc_stby = acc_stby;
372 	if (mag_stby != -1 && update)
373 		data->mag_stby = mag_stby;
374 
375 	return 0;
376 }
377 
378 static int kmx61_get_mode(struct kmx61_data *data, u8 *mode, u8 device)
379 {
380 	int ret;
381 
382 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_STBY);
383 	if (ret < 0) {
384 		dev_err(&data->client->dev, "Error reading reg_stby\n");
385 		return ret;
386 	}
387 	*mode = 0;
388 
389 	if (device & KMX61_ACC) {
390 		if (ret & KMX61_ACC_STBY_BIT)
391 			*mode |= KMX61_ACC_STBY_BIT;
392 		else
393 			*mode &= ~KMX61_ACC_STBY_BIT;
394 	}
395 
396 	if (device & KMX61_MAG) {
397 		if (ret & KMX61_MAG_STBY_BIT)
398 			*mode |= KMX61_MAG_STBY_BIT;
399 		else
400 			*mode &= ~KMX61_MAG_STBY_BIT;
401 	}
402 
403 	return 0;
404 }
405 
406 static int kmx61_set_wake_up_odr(struct kmx61_data *data, int val, int val2)
407 {
408 	int ret, odr_bits;
409 
410 	odr_bits = kmx61_convert_wake_up_odr_to_bit(val, val2);
411 	if (odr_bits < 0)
412 		return odr_bits;
413 
414 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL2,
415 					odr_bits);
416 	if (ret < 0)
417 		dev_err(&data->client->dev, "Error writing reg_ctrl2\n");
418 	return ret;
419 }
420 
421 static int kmx61_set_odr(struct kmx61_data *data, int val, int val2, u8 device)
422 {
423 	int ret;
424 	u8 mode;
425 	int lodr_bits, odr_bits;
426 
427 	ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG);
428 	if (ret < 0)
429 		return ret;
430 
431 	lodr_bits = kmx61_convert_freq_to_bit(val, val2);
432 	if (lodr_bits < 0)
433 		return lodr_bits;
434 
435 	/* To change ODR, accel and magn must be in STDBY */
436 	ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG,
437 			     true);
438 	if (ret < 0)
439 		return ret;
440 
441 	odr_bits = 0;
442 	if (device & KMX61_ACC)
443 		odr_bits |= lodr_bits << KMX61_ACC_ODR_SHIFT;
444 	if (device & KMX61_MAG)
445 		odr_bits |= lodr_bits << KMX61_MAG_ODR_SHIFT;
446 
447 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_ODCNTL,
448 					odr_bits);
449 	if (ret < 0)
450 		return ret;
451 
452 	data->odr_bits = odr_bits;
453 
454 	if (device & KMX61_ACC) {
455 		ret = kmx61_set_wake_up_odr(data, val, val2);
456 		if (ret)
457 			return ret;
458 	}
459 
460 	return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
461 }
462 
463 static int kmx61_get_odr(struct kmx61_data *data, int *val, int *val2,
464 			 u8 device)
465 {
466 	u8 lodr_bits;
467 
468 	if (device & KMX61_ACC)
469 		lodr_bits = (data->odr_bits >> KMX61_ACC_ODR_SHIFT) &
470 			     KMX61_ACC_ODR_MASK;
471 	else if (device & KMX61_MAG)
472 		lodr_bits = (data->odr_bits >> KMX61_MAG_ODR_SHIFT) &
473 			     KMX61_MAG_ODR_MASK;
474 	else
475 		return -EINVAL;
476 
477 	if (lodr_bits >= ARRAY_SIZE(kmx61_samp_freq_table))
478 		return -EINVAL;
479 
480 	*val = kmx61_samp_freq_table[lodr_bits].val;
481 	*val2 = kmx61_samp_freq_table[lodr_bits].val2;
482 
483 	return 0;
484 }
485 
486 static int kmx61_set_range(struct kmx61_data *data, u8 range)
487 {
488 	int ret;
489 
490 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
491 	if (ret < 0) {
492 		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
493 		return ret;
494 	}
495 
496 	ret &= ~KMX61_REG_CTRL1_GSEL_MASK;
497 	ret |= range & KMX61_REG_CTRL1_GSEL_MASK;
498 
499 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
500 	if (ret < 0) {
501 		dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
502 		return ret;
503 	}
504 
505 	data->range = range;
506 
507 	return 0;
508 }
509 
510 static int kmx61_set_scale(struct kmx61_data *data, u16 uscale)
511 {
512 	int ret, i;
513 	u8  mode;
514 
515 	for (i = 0; i < ARRAY_SIZE(kmx61_uscale_table); i++) {
516 		if (kmx61_uscale_table[i] == uscale) {
517 			ret = kmx61_get_mode(data, &mode,
518 					     KMX61_ACC | KMX61_MAG);
519 			if (ret < 0)
520 				return ret;
521 
522 			ret = kmx61_set_mode(data, KMX61_ALL_STBY,
523 					     KMX61_ACC | KMX61_MAG, true);
524 			if (ret < 0)
525 				return ret;
526 
527 			ret = kmx61_set_range(data, i);
528 			if (ret < 0)
529 				return ret;
530 
531 			return  kmx61_set_mode(data, mode,
532 					       KMX61_ACC | KMX61_MAG, true);
533 		}
534 	}
535 	return -EINVAL;
536 }
537 
538 static int kmx61_chip_init(struct kmx61_data *data)
539 {
540 	int ret, val, val2;
541 
542 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_WHO_AM_I);
543 	if (ret < 0) {
544 		dev_err(&data->client->dev, "Error reading who_am_i\n");
545 		return ret;
546 	}
547 
548 	if (ret != KMX61_CHIP_ID) {
549 		dev_err(&data->client->dev,
550 			"Wrong chip id, got %x expected %x\n",
551 			 ret, KMX61_CHIP_ID);
552 		return -EINVAL;
553 	}
554 
555 	/* set accel 12bit, 4g range */
556 	ret = kmx61_set_range(data, KMX61_RANGE_4G);
557 	if (ret < 0)
558 		return ret;
559 
560 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_ODCNTL);
561 	if (ret < 0) {
562 		dev_err(&data->client->dev, "Error reading reg_odcntl\n");
563 		return ret;
564 	}
565 	data->odr_bits = ret;
566 
567 	/*
568 	 * set output data rate for wake up (motion detection) function
569 	 * to match data rate for accelerometer sampling
570 	 */
571 	ret = kmx61_get_odr(data, &val, &val2, KMX61_ACC);
572 	if (ret < 0)
573 		return ret;
574 
575 	ret = kmx61_set_wake_up_odr(data, val, val2);
576 	if (ret < 0)
577 		return ret;
578 
579 	/* set acc/magn to OPERATION mode */
580 	ret = kmx61_set_mode(data, 0, KMX61_ACC | KMX61_MAG, true);
581 	if (ret < 0)
582 		return ret;
583 
584 	data->wake_thresh = KMX61_DEFAULT_WAKE_THRESH;
585 	data->wake_duration = KMX61_DEFAULT_WAKE_DURATION;
586 
587 	return 0;
588 }
589 
590 static int kmx61_setup_new_data_interrupt(struct kmx61_data *data,
591 					  bool status, u8 device)
592 {
593 	u8 mode;
594 	int ret;
595 
596 	ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG);
597 	if (ret < 0)
598 		return ret;
599 
600 	ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
601 	if (ret < 0)
602 		return ret;
603 
604 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INC1);
605 	if (ret < 0) {
606 		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
607 		return ret;
608 	}
609 
610 	if (status) {
611 		ret |= KMX61_REG_INC1_BIT_IEN;
612 		if (device & KMX61_ACC)
613 			ret |= KMX61_REG_INC1_BIT_DRDYA;
614 		if (device & KMX61_MAG)
615 			ret |=  KMX61_REG_INC1_BIT_DRDYM;
616 	} else {
617 		ret &= ~KMX61_REG_INC1_BIT_IEN;
618 		if (device & KMX61_ACC)
619 			ret &= ~KMX61_REG_INC1_BIT_DRDYA;
620 		if (device & KMX61_MAG)
621 			ret &= ~KMX61_REG_INC1_BIT_DRDYM;
622 	}
623 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_INC1, ret);
624 	if (ret < 0) {
625 		dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n");
626 		return ret;
627 	}
628 
629 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
630 	if (ret < 0) {
631 		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
632 		return ret;
633 	}
634 
635 	if (status)
636 		ret |= KMX61_REG_CTRL1_BIT_DRDYE;
637 	else
638 		ret &= ~KMX61_REG_CTRL1_BIT_DRDYE;
639 
640 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
641 	if (ret < 0) {
642 		dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
643 		return ret;
644 	}
645 
646 	return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
647 }
648 
649 static int kmx61_chip_update_thresholds(struct kmx61_data *data)
650 {
651 	int ret;
652 
653 	ret = i2c_smbus_write_byte_data(data->client,
654 					KMX61_REG_WUF_TIMER,
655 					data->wake_duration);
656 	if (ret < 0) {
657 		dev_err(&data->client->dev, "Errow writing reg_wuf_timer\n");
658 		return ret;
659 	}
660 
661 	ret = i2c_smbus_write_byte_data(data->client,
662 					KMX61_REG_WUF_THRESH,
663 					data->wake_thresh);
664 	if (ret < 0)
665 		dev_err(&data->client->dev, "Error writing reg_wuf_thresh\n");
666 
667 	return ret;
668 }
669 
670 static int kmx61_setup_any_motion_interrupt(struct kmx61_data *data,
671 					    bool status)
672 {
673 	u8 mode;
674 	int ret;
675 
676 	ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG);
677 	if (ret < 0)
678 		return ret;
679 
680 	ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
681 	if (ret < 0)
682 		return ret;
683 
684 	ret = kmx61_chip_update_thresholds(data);
685 	if (ret < 0)
686 		return ret;
687 
688 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INC1);
689 	if (ret < 0) {
690 		dev_err(&data->client->dev, "Error reading reg_inc1\n");
691 		return ret;
692 	}
693 	if (status)
694 		ret |= (KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS);
695 	else
696 		ret &= ~(KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS);
697 
698 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_INC1, ret);
699 	if (ret < 0) {
700 		dev_err(&data->client->dev, "Error writing reg_inc1\n");
701 		return ret;
702 	}
703 
704 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
705 	if (ret < 0) {
706 		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
707 		return ret;
708 	}
709 
710 	if (status)
711 		ret |= KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE;
712 	else
713 		ret &= ~(KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE);
714 
715 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
716 	if (ret < 0) {
717 		dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
718 		return ret;
719 	}
720 	mode |= KMX61_ACT_STBY_BIT;
721 	return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
722 }
723 
724 /**
725  * kmx61_set_power_state() - set power state for kmx61 @device
726  * @data - kmx61 device private pointer
727  * @on - power state to be set for @device
728  * @device - bitmask indicating device for which @on state needs to be set
729  *
730  * Notice that when ACC power state needs to be set to ON and MAG is in
731  * OPERATION then we know that kmx61_runtime_resume was already called
732  * so we must set ACC OPERATION mode here. The same happens when MAG power
733  * state needs to be set to ON and ACC is in OPERATION.
734  */
735 static int kmx61_set_power_state(struct kmx61_data *data, bool on, u8 device)
736 {
737 #ifdef CONFIG_PM
738 	int ret;
739 
740 	if (device & KMX61_ACC) {
741 		if (on && !data->acc_ps && !data->mag_stby) {
742 			ret = kmx61_set_mode(data, 0, KMX61_ACC, true);
743 			if (ret < 0)
744 				return ret;
745 		}
746 		data->acc_ps = on;
747 	}
748 	if (device & KMX61_MAG) {
749 		if (on && !data->mag_ps && !data->acc_stby) {
750 			ret = kmx61_set_mode(data, 0, KMX61_MAG, true);
751 			if (ret < 0)
752 				return ret;
753 		}
754 		data->mag_ps = on;
755 	}
756 
757 	if (on) {
758 		ret = pm_runtime_get_sync(&data->client->dev);
759 	} else {
760 		pm_runtime_mark_last_busy(&data->client->dev);
761 		ret = pm_runtime_put_autosuspend(&data->client->dev);
762 	}
763 	if (ret < 0) {
764 		dev_err(&data->client->dev,
765 			"Failed: kmx61_set_power_state for %d, ret %d\n",
766 			on, ret);
767 		if (on)
768 			pm_runtime_put_noidle(&data->client->dev);
769 
770 		return ret;
771 	}
772 #endif
773 	return 0;
774 }
775 
776 static int kmx61_read_measurement(struct kmx61_data *data, u8 base, u8 offset)
777 {
778 	int ret;
779 	u8 reg = base + offset * 2;
780 
781 	ret = i2c_smbus_read_word_data(data->client, reg);
782 	if (ret < 0)
783 		dev_err(&data->client->dev, "failed to read reg at %x\n", reg);
784 
785 	return ret;
786 }
787 
788 static int kmx61_read_raw(struct iio_dev *indio_dev,
789 			  struct iio_chan_spec const *chan, int *val,
790 			  int *val2, long mask)
791 {
792 	int ret;
793 	u8 base_reg;
794 	struct kmx61_data *data = kmx61_get_data(indio_dev);
795 
796 	switch (mask) {
797 	case IIO_CHAN_INFO_RAW:
798 		switch (chan->type) {
799 		case IIO_ACCEL:
800 			base_reg = KMX61_ACC_XOUT_L;
801 			break;
802 		case IIO_MAGN:
803 			base_reg = KMX61_MAG_XOUT_L;
804 			break;
805 		default:
806 			return -EINVAL;
807 		}
808 		mutex_lock(&data->lock);
809 
810 		ret = kmx61_set_power_state(data, true, chan->address);
811 		if (ret) {
812 			mutex_unlock(&data->lock);
813 			return ret;
814 		}
815 
816 		ret = kmx61_read_measurement(data, base_reg, chan->scan_index);
817 		if (ret < 0) {
818 			kmx61_set_power_state(data, false, chan->address);
819 			mutex_unlock(&data->lock);
820 			return ret;
821 		}
822 		*val = sign_extend32(ret >> chan->scan_type.shift,
823 				     chan->scan_type.realbits - 1);
824 		ret = kmx61_set_power_state(data, false, chan->address);
825 
826 		mutex_unlock(&data->lock);
827 		if (ret)
828 			return ret;
829 		return IIO_VAL_INT;
830 	case IIO_CHAN_INFO_SCALE:
831 		switch (chan->type) {
832 		case IIO_ACCEL:
833 			*val = 0;
834 			*val2 = kmx61_uscale_table[data->range];
835 			return IIO_VAL_INT_PLUS_MICRO;
836 		case IIO_MAGN:
837 			/* 14 bits res, 1465 microGauss per magn count */
838 			*val = 0;
839 			*val2 = 1465;
840 			return IIO_VAL_INT_PLUS_MICRO;
841 		default:
842 			return -EINVAL;
843 		}
844 	case IIO_CHAN_INFO_SAMP_FREQ:
845 		if (chan->type != IIO_ACCEL && chan->type != IIO_MAGN)
846 			return -EINVAL;
847 
848 		mutex_lock(&data->lock);
849 		ret = kmx61_get_odr(data, val, val2, chan->address);
850 		mutex_unlock(&data->lock);
851 		if (ret)
852 			return -EINVAL;
853 		return IIO_VAL_INT_PLUS_MICRO;
854 	}
855 	return -EINVAL;
856 }
857 
858 static int kmx61_write_raw(struct iio_dev *indio_dev,
859 			   struct iio_chan_spec const *chan, int val,
860 			   int val2, long mask)
861 {
862 	int ret;
863 	struct kmx61_data *data = kmx61_get_data(indio_dev);
864 
865 	switch (mask) {
866 	case IIO_CHAN_INFO_SAMP_FREQ:
867 		if (chan->type != IIO_ACCEL && chan->type != IIO_MAGN)
868 			return -EINVAL;
869 
870 		mutex_lock(&data->lock);
871 		ret = kmx61_set_odr(data, val, val2, chan->address);
872 		mutex_unlock(&data->lock);
873 		return ret;
874 	case IIO_CHAN_INFO_SCALE:
875 		switch (chan->type) {
876 		case IIO_ACCEL:
877 			if (val != 0)
878 				return -EINVAL;
879 			mutex_lock(&data->lock);
880 			ret = kmx61_set_scale(data, val2);
881 			mutex_unlock(&data->lock);
882 			return ret;
883 		default:
884 			return -EINVAL;
885 		}
886 	default:
887 		return -EINVAL;
888 	}
889 }
890 
891 static int kmx61_read_event(struct iio_dev *indio_dev,
892 			    const struct iio_chan_spec *chan,
893 			    enum iio_event_type type,
894 			    enum iio_event_direction dir,
895 			    enum iio_event_info info,
896 			    int *val, int *val2)
897 {
898 	struct kmx61_data *data = kmx61_get_data(indio_dev);
899 
900 	*val2 = 0;
901 	switch (info) {
902 	case IIO_EV_INFO_VALUE:
903 		*val = data->wake_thresh;
904 		return IIO_VAL_INT;
905 	case IIO_EV_INFO_PERIOD:
906 		*val = data->wake_duration;
907 		return IIO_VAL_INT;
908 	default:
909 		return -EINVAL;
910 	}
911 }
912 
913 static int kmx61_write_event(struct iio_dev *indio_dev,
914 			     const struct iio_chan_spec *chan,
915 			     enum iio_event_type type,
916 			     enum iio_event_direction dir,
917 			     enum iio_event_info info,
918 			     int val, int val2)
919 {
920 	struct kmx61_data *data = kmx61_get_data(indio_dev);
921 
922 	if (data->ev_enable_state)
923 		return -EBUSY;
924 
925 	switch (info) {
926 	case IIO_EV_INFO_VALUE:
927 		data->wake_thresh = val;
928 		return IIO_VAL_INT;
929 	case IIO_EV_INFO_PERIOD:
930 		data->wake_duration = val;
931 		return IIO_VAL_INT;
932 	default:
933 		return -EINVAL;
934 	}
935 }
936 
937 static int kmx61_read_event_config(struct iio_dev *indio_dev,
938 				   const struct iio_chan_spec *chan,
939 				   enum iio_event_type type,
940 				   enum iio_event_direction dir)
941 {
942 	struct kmx61_data *data = kmx61_get_data(indio_dev);
943 
944 	return data->ev_enable_state;
945 }
946 
947 static int kmx61_write_event_config(struct iio_dev *indio_dev,
948 				    const struct iio_chan_spec *chan,
949 				    enum iio_event_type type,
950 				    enum iio_event_direction dir,
951 				    int state)
952 {
953 	struct kmx61_data *data = kmx61_get_data(indio_dev);
954 	int ret = 0;
955 
956 	if (state && data->ev_enable_state)
957 		return 0;
958 
959 	mutex_lock(&data->lock);
960 
961 	if (!state && data->motion_trig_on) {
962 		data->ev_enable_state = false;
963 		goto err_unlock;
964 	}
965 
966 	ret = kmx61_set_power_state(data, state, KMX61_ACC);
967 	if (ret < 0)
968 		goto err_unlock;
969 
970 	ret = kmx61_setup_any_motion_interrupt(data, state);
971 	if (ret < 0) {
972 		kmx61_set_power_state(data, false, KMX61_ACC);
973 		goto err_unlock;
974 	}
975 
976 	data->ev_enable_state = state;
977 
978 err_unlock:
979 	mutex_unlock(&data->lock);
980 
981 	return ret;
982 }
983 
984 static int kmx61_acc_validate_trigger(struct iio_dev *indio_dev,
985 				      struct iio_trigger *trig)
986 {
987 	struct kmx61_data *data = kmx61_get_data(indio_dev);
988 
989 	if (data->acc_dready_trig != trig && data->motion_trig != trig)
990 		return -EINVAL;
991 
992 	return 0;
993 }
994 
995 static int kmx61_mag_validate_trigger(struct iio_dev *indio_dev,
996 				      struct iio_trigger *trig)
997 {
998 	struct kmx61_data *data = kmx61_get_data(indio_dev);
999 
1000 	if (data->mag_dready_trig != trig)
1001 		return -EINVAL;
1002 
1003 	return 0;
1004 }
1005 
1006 static const struct iio_info kmx61_acc_info = {
1007 	.driver_module		= THIS_MODULE,
1008 	.read_raw		= kmx61_read_raw,
1009 	.write_raw		= kmx61_write_raw,
1010 	.attrs			= &kmx61_acc_attribute_group,
1011 	.read_event_value	= kmx61_read_event,
1012 	.write_event_value	= kmx61_write_event,
1013 	.read_event_config	= kmx61_read_event_config,
1014 	.write_event_config	= kmx61_write_event_config,
1015 	.validate_trigger	= kmx61_acc_validate_trigger,
1016 };
1017 
1018 static const struct iio_info kmx61_mag_info = {
1019 	.driver_module		= THIS_MODULE,
1020 	.read_raw		= kmx61_read_raw,
1021 	.write_raw		= kmx61_write_raw,
1022 	.attrs			= &kmx61_mag_attribute_group,
1023 	.validate_trigger	= kmx61_mag_validate_trigger,
1024 };
1025 
1026 
1027 static int kmx61_data_rdy_trigger_set_state(struct iio_trigger *trig,
1028 					    bool state)
1029 {
1030 	int ret = 0;
1031 	u8 device;
1032 
1033 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1034 	struct kmx61_data *data = kmx61_get_data(indio_dev);
1035 
1036 	mutex_lock(&data->lock);
1037 
1038 	if (!state && data->ev_enable_state && data->motion_trig_on) {
1039 		data->motion_trig_on = false;
1040 		goto err_unlock;
1041 	}
1042 
1043 	if (data->acc_dready_trig == trig || data->motion_trig == trig)
1044 		device = KMX61_ACC;
1045 	else
1046 		device = KMX61_MAG;
1047 
1048 	ret = kmx61_set_power_state(data, state, device);
1049 	if (ret < 0)
1050 		goto err_unlock;
1051 
1052 	if (data->acc_dready_trig == trig || data->mag_dready_trig == trig)
1053 		ret = kmx61_setup_new_data_interrupt(data, state, device);
1054 	else
1055 		ret = kmx61_setup_any_motion_interrupt(data, state);
1056 	if (ret < 0) {
1057 		kmx61_set_power_state(data, false, device);
1058 		goto err_unlock;
1059 	}
1060 
1061 	if (data->acc_dready_trig == trig)
1062 		data->acc_dready_trig_on = state;
1063 	else if (data->mag_dready_trig == trig)
1064 		data->mag_dready_trig_on = state;
1065 	else
1066 		data->motion_trig_on = state;
1067 err_unlock:
1068 	mutex_unlock(&data->lock);
1069 
1070 	return ret;
1071 }
1072 
1073 static int kmx61_trig_try_reenable(struct iio_trigger *trig)
1074 {
1075 	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
1076 	struct kmx61_data *data = kmx61_get_data(indio_dev);
1077 	int ret;
1078 
1079 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INL);
1080 	if (ret < 0) {
1081 		dev_err(&data->client->dev, "Error reading reg_inl\n");
1082 		return ret;
1083 	}
1084 
1085 	return 0;
1086 }
1087 
1088 static const struct iio_trigger_ops kmx61_trigger_ops = {
1089 	.set_trigger_state = kmx61_data_rdy_trigger_set_state,
1090 	.try_reenable = kmx61_trig_try_reenable,
1091 	.owner = THIS_MODULE,
1092 };
1093 
1094 static irqreturn_t kmx61_event_handler(int irq, void *private)
1095 {
1096 	struct kmx61_data *data = private;
1097 	struct iio_dev *indio_dev = data->acc_indio_dev;
1098 	int ret;
1099 
1100 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INS1);
1101 	if (ret < 0) {
1102 		dev_err(&data->client->dev, "Error reading reg_ins1\n");
1103 		goto ack_intr;
1104 	}
1105 
1106 	if (ret & KMX61_REG_INS1_BIT_WUFS) {
1107 		ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INS2);
1108 		if (ret < 0) {
1109 			dev_err(&data->client->dev, "Error reading reg_ins2\n");
1110 			goto ack_intr;
1111 		}
1112 
1113 		if (ret & KMX61_REG_INS2_BIT_XN)
1114 			iio_push_event(indio_dev,
1115 				       IIO_MOD_EVENT_CODE(IIO_ACCEL,
1116 				       0,
1117 				       IIO_MOD_X,
1118 				       IIO_EV_TYPE_THRESH,
1119 				       IIO_EV_DIR_FALLING),
1120 				       0);
1121 
1122 		if (ret & KMX61_REG_INS2_BIT_XP)
1123 			iio_push_event(indio_dev,
1124 				       IIO_MOD_EVENT_CODE(IIO_ACCEL,
1125 				       0,
1126 				       IIO_MOD_X,
1127 				       IIO_EV_TYPE_THRESH,
1128 				       IIO_EV_DIR_RISING),
1129 				       0);
1130 
1131 		if (ret & KMX61_REG_INS2_BIT_YN)
1132 			iio_push_event(indio_dev,
1133 				       IIO_MOD_EVENT_CODE(IIO_ACCEL,
1134 				       0,
1135 				       IIO_MOD_Y,
1136 				       IIO_EV_TYPE_THRESH,
1137 				       IIO_EV_DIR_FALLING),
1138 				       0);
1139 
1140 		if (ret & KMX61_REG_INS2_BIT_YP)
1141 			iio_push_event(indio_dev,
1142 				       IIO_MOD_EVENT_CODE(IIO_ACCEL,
1143 				       0,
1144 				       IIO_MOD_Y,
1145 				       IIO_EV_TYPE_THRESH,
1146 				       IIO_EV_DIR_RISING),
1147 				       0);
1148 
1149 		if (ret & KMX61_REG_INS2_BIT_ZN)
1150 			iio_push_event(indio_dev,
1151 				       IIO_MOD_EVENT_CODE(IIO_ACCEL,
1152 				       0,
1153 				       IIO_MOD_Z,
1154 				       IIO_EV_TYPE_THRESH,
1155 				       IIO_EV_DIR_FALLING),
1156 				       0);
1157 
1158 		if (ret & KMX61_REG_INS2_BIT_ZP)
1159 			iio_push_event(indio_dev,
1160 				       IIO_MOD_EVENT_CODE(IIO_ACCEL,
1161 				       0,
1162 				       IIO_MOD_Z,
1163 				       IIO_EV_TYPE_THRESH,
1164 				       IIO_EV_DIR_RISING),
1165 				       0);
1166 	}
1167 
1168 ack_intr:
1169 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
1170 	if (ret < 0)
1171 		dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
1172 
1173 	ret |= KMX61_REG_CTRL1_BIT_RES;
1174 	ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
1175 	if (ret < 0)
1176 		dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
1177 
1178 	ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INL);
1179 	if (ret < 0)
1180 		dev_err(&data->client->dev, "Error reading reg_inl\n");
1181 
1182 	return IRQ_HANDLED;
1183 }
1184 
1185 static irqreturn_t kmx61_data_rdy_trig_poll(int irq, void *private)
1186 {
1187 	struct kmx61_data *data = private;
1188 
1189 	if (data->acc_dready_trig_on)
1190 		iio_trigger_poll(data->acc_dready_trig);
1191 	if (data->mag_dready_trig_on)
1192 		iio_trigger_poll(data->mag_dready_trig);
1193 
1194 	if (data->motion_trig_on)
1195 		iio_trigger_poll(data->motion_trig);
1196 
1197 	if (data->ev_enable_state)
1198 		return IRQ_WAKE_THREAD;
1199 	return IRQ_HANDLED;
1200 }
1201 
1202 static irqreturn_t kmx61_trigger_handler(int irq, void *p)
1203 {
1204 	struct iio_poll_func *pf = p;
1205 	struct iio_dev *indio_dev = pf->indio_dev;
1206 	struct kmx61_data *data = kmx61_get_data(indio_dev);
1207 	int bit, ret, i = 0;
1208 	u8 base;
1209 	s16 buffer[8];
1210 
1211 	if (indio_dev == data->acc_indio_dev)
1212 		base = KMX61_ACC_XOUT_L;
1213 	else
1214 		base = KMX61_MAG_XOUT_L;
1215 
1216 	mutex_lock(&data->lock);
1217 	for_each_set_bit(bit, indio_dev->active_scan_mask,
1218 			 indio_dev->masklength) {
1219 		ret = kmx61_read_measurement(data, base, bit);
1220 		if (ret < 0) {
1221 			mutex_unlock(&data->lock);
1222 			goto err;
1223 		}
1224 		buffer[i++] = ret;
1225 	}
1226 	mutex_unlock(&data->lock);
1227 
1228 	iio_push_to_buffers(indio_dev, buffer);
1229 err:
1230 	iio_trigger_notify_done(indio_dev->trig);
1231 
1232 	return IRQ_HANDLED;
1233 }
1234 
1235 static const char *kmx61_match_acpi_device(struct device *dev)
1236 {
1237 	const struct acpi_device_id *id;
1238 
1239 	id = acpi_match_device(dev->driver->acpi_match_table, dev);
1240 	if (!id)
1241 		return NULL;
1242 	return dev_name(dev);
1243 }
1244 
1245 static struct iio_dev *kmx61_indiodev_setup(struct kmx61_data *data,
1246 					    const struct iio_info *info,
1247 					    const struct iio_chan_spec *chan,
1248 					    int num_channels,
1249 					    const char *name)
1250 {
1251 	struct iio_dev *indio_dev;
1252 
1253 	indio_dev = devm_iio_device_alloc(&data->client->dev, sizeof(data));
1254 	if (!indio_dev)
1255 		return ERR_PTR(-ENOMEM);
1256 
1257 	kmx61_set_data(indio_dev, data);
1258 
1259 	indio_dev->dev.parent = &data->client->dev;
1260 	indio_dev->channels = chan;
1261 	indio_dev->num_channels = num_channels;
1262 	indio_dev->name = name;
1263 	indio_dev->modes = INDIO_DIRECT_MODE;
1264 	indio_dev->info = info;
1265 
1266 	return indio_dev;
1267 }
1268 
1269 static struct iio_trigger *kmx61_trigger_setup(struct kmx61_data *data,
1270 					       struct iio_dev *indio_dev,
1271 					       const char *tag)
1272 {
1273 	struct iio_trigger *trig;
1274 	int ret;
1275 
1276 	trig = devm_iio_trigger_alloc(&data->client->dev,
1277 				      "%s-%s-dev%d",
1278 				      indio_dev->name,
1279 				      tag,
1280 				      indio_dev->id);
1281 	if (!trig)
1282 		return ERR_PTR(-ENOMEM);
1283 
1284 	trig->dev.parent = &data->client->dev;
1285 	trig->ops = &kmx61_trigger_ops;
1286 	iio_trigger_set_drvdata(trig, indio_dev);
1287 
1288 	ret = iio_trigger_register(trig);
1289 	if (ret)
1290 		return ERR_PTR(ret);
1291 
1292 	return trig;
1293 }
1294 
1295 static int kmx61_probe(struct i2c_client *client,
1296 		       const struct i2c_device_id *id)
1297 {
1298 	int ret;
1299 	struct kmx61_data *data;
1300 	const char *name = NULL;
1301 
1302 	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
1303 	if (!data)
1304 		return -ENOMEM;
1305 
1306 	i2c_set_clientdata(client, data);
1307 	data->client = client;
1308 
1309 	mutex_init(&data->lock);
1310 
1311 	if (id)
1312 		name = id->name;
1313 	else if (ACPI_HANDLE(&client->dev))
1314 		name = kmx61_match_acpi_device(&client->dev);
1315 	else
1316 		return -ENODEV;
1317 
1318 	data->acc_indio_dev =
1319 		kmx61_indiodev_setup(data, &kmx61_acc_info,
1320 				     kmx61_acc_channels,
1321 				     ARRAY_SIZE(kmx61_acc_channels),
1322 				     name);
1323 	if (IS_ERR(data->acc_indio_dev))
1324 		return PTR_ERR(data->acc_indio_dev);
1325 
1326 	data->mag_indio_dev =
1327 		kmx61_indiodev_setup(data, &kmx61_mag_info,
1328 				     kmx61_mag_channels,
1329 				     ARRAY_SIZE(kmx61_mag_channels),
1330 				     name);
1331 	if (IS_ERR(data->mag_indio_dev))
1332 		return PTR_ERR(data->mag_indio_dev);
1333 
1334 	ret = kmx61_chip_init(data);
1335 	if (ret < 0)
1336 		return ret;
1337 
1338 	if (client->irq > 0) {
1339 		ret = devm_request_threaded_irq(&client->dev, client->irq,
1340 						kmx61_data_rdy_trig_poll,
1341 						kmx61_event_handler,
1342 						IRQF_TRIGGER_RISING,
1343 						KMX61_IRQ_NAME,
1344 						data);
1345 		if (ret)
1346 			goto err_chip_uninit;
1347 
1348 		data->acc_dready_trig =
1349 			kmx61_trigger_setup(data, data->acc_indio_dev,
1350 					    "dready");
1351 		if (IS_ERR(data->acc_dready_trig)) {
1352 			ret = PTR_ERR(data->acc_dready_trig);
1353 			goto err_chip_uninit;
1354 		}
1355 
1356 		data->mag_dready_trig =
1357 			kmx61_trigger_setup(data, data->mag_indio_dev,
1358 					    "dready");
1359 		if (IS_ERR(data->mag_dready_trig)) {
1360 			ret = PTR_ERR(data->mag_dready_trig);
1361 			goto err_trigger_unregister_acc_dready;
1362 		}
1363 
1364 		data->motion_trig =
1365 			kmx61_trigger_setup(data, data->acc_indio_dev,
1366 					    "any-motion");
1367 		if (IS_ERR(data->motion_trig)) {
1368 			ret = PTR_ERR(data->motion_trig);
1369 			goto err_trigger_unregister_mag_dready;
1370 		}
1371 
1372 		ret = iio_triggered_buffer_setup(data->acc_indio_dev,
1373 						 &iio_pollfunc_store_time,
1374 						 kmx61_trigger_handler,
1375 						 NULL);
1376 		if (ret < 0) {
1377 			dev_err(&data->client->dev,
1378 				"Failed to setup acc triggered buffer\n");
1379 			goto err_trigger_unregister_motion;
1380 		}
1381 
1382 		ret = iio_triggered_buffer_setup(data->mag_indio_dev,
1383 						 &iio_pollfunc_store_time,
1384 						 kmx61_trigger_handler,
1385 						 NULL);
1386 		if (ret < 0) {
1387 			dev_err(&data->client->dev,
1388 				"Failed to setup mag triggered buffer\n");
1389 			goto err_buffer_cleanup_acc;
1390 		}
1391 	}
1392 
1393 	ret = iio_device_register(data->acc_indio_dev);
1394 	if (ret < 0) {
1395 		dev_err(&client->dev, "Failed to register acc iio device\n");
1396 		goto err_buffer_cleanup_mag;
1397 	}
1398 
1399 	ret = iio_device_register(data->mag_indio_dev);
1400 	if (ret < 0) {
1401 		dev_err(&client->dev, "Failed to register mag iio device\n");
1402 		goto err_iio_unregister_acc;
1403 	}
1404 
1405 	ret = pm_runtime_set_active(&client->dev);
1406 	if (ret < 0)
1407 		goto err_iio_unregister_mag;
1408 
1409 	pm_runtime_enable(&client->dev);
1410 	pm_runtime_set_autosuspend_delay(&client->dev, KMX61_SLEEP_DELAY_MS);
1411 	pm_runtime_use_autosuspend(&client->dev);
1412 
1413 	return 0;
1414 
1415 err_iio_unregister_mag:
1416 	iio_device_unregister(data->mag_indio_dev);
1417 err_iio_unregister_acc:
1418 	iio_device_unregister(data->acc_indio_dev);
1419 err_buffer_cleanup_mag:
1420 	if (client->irq > 0)
1421 		iio_triggered_buffer_cleanup(data->mag_indio_dev);
1422 err_buffer_cleanup_acc:
1423 	if (client->irq > 0)
1424 		iio_triggered_buffer_cleanup(data->acc_indio_dev);
1425 err_trigger_unregister_motion:
1426 	iio_trigger_unregister(data->motion_trig);
1427 err_trigger_unregister_mag_dready:
1428 	iio_trigger_unregister(data->mag_dready_trig);
1429 err_trigger_unregister_acc_dready:
1430 	iio_trigger_unregister(data->acc_dready_trig);
1431 err_chip_uninit:
1432 	kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
1433 	return ret;
1434 }
1435 
1436 static int kmx61_remove(struct i2c_client *client)
1437 {
1438 	struct kmx61_data *data = i2c_get_clientdata(client);
1439 
1440 	pm_runtime_disable(&client->dev);
1441 	pm_runtime_set_suspended(&client->dev);
1442 	pm_runtime_put_noidle(&client->dev);
1443 
1444 	iio_device_unregister(data->acc_indio_dev);
1445 	iio_device_unregister(data->mag_indio_dev);
1446 
1447 	if (client->irq > 0) {
1448 		iio_triggered_buffer_cleanup(data->acc_indio_dev);
1449 		iio_triggered_buffer_cleanup(data->mag_indio_dev);
1450 		iio_trigger_unregister(data->acc_dready_trig);
1451 		iio_trigger_unregister(data->mag_dready_trig);
1452 		iio_trigger_unregister(data->motion_trig);
1453 	}
1454 
1455 	mutex_lock(&data->lock);
1456 	kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
1457 	mutex_unlock(&data->lock);
1458 
1459 	return 0;
1460 }
1461 
1462 #ifdef CONFIG_PM_SLEEP
1463 static int kmx61_suspend(struct device *dev)
1464 {
1465 	int ret;
1466 	struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
1467 
1468 	mutex_lock(&data->lock);
1469 	ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG,
1470 			     false);
1471 	mutex_unlock(&data->lock);
1472 
1473 	return ret;
1474 }
1475 
1476 static int kmx61_resume(struct device *dev)
1477 {
1478 	u8 stby = 0;
1479 	struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
1480 
1481 	if (data->acc_stby)
1482 		stby |= KMX61_ACC_STBY_BIT;
1483 	if (data->mag_stby)
1484 		stby |= KMX61_MAG_STBY_BIT;
1485 
1486 	return kmx61_set_mode(data, stby, KMX61_ACC | KMX61_MAG, true);
1487 }
1488 #endif
1489 
1490 #ifdef CONFIG_PM
1491 static int kmx61_runtime_suspend(struct device *dev)
1492 {
1493 	struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
1494 	int ret;
1495 
1496 	mutex_lock(&data->lock);
1497 	ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
1498 	mutex_unlock(&data->lock);
1499 
1500 	return ret;
1501 }
1502 
1503 static int kmx61_runtime_resume(struct device *dev)
1504 {
1505 	struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
1506 	u8 stby = 0;
1507 
1508 	if (!data->acc_ps)
1509 		stby |= KMX61_ACC_STBY_BIT;
1510 	if (!data->mag_ps)
1511 		stby |= KMX61_MAG_STBY_BIT;
1512 
1513 	return kmx61_set_mode(data, stby, KMX61_ACC | KMX61_MAG, true);
1514 }
1515 #endif
1516 
1517 static const struct dev_pm_ops kmx61_pm_ops = {
1518 	SET_SYSTEM_SLEEP_PM_OPS(kmx61_suspend, kmx61_resume)
1519 	SET_RUNTIME_PM_OPS(kmx61_runtime_suspend, kmx61_runtime_resume, NULL)
1520 };
1521 
1522 static const struct acpi_device_id kmx61_acpi_match[] = {
1523 	{"KMX61021", 0},
1524 	{}
1525 };
1526 
1527 MODULE_DEVICE_TABLE(acpi, kmx61_acpi_match);
1528 
1529 static const struct i2c_device_id kmx61_id[] = {
1530 	{"kmx611021", 0},
1531 	{}
1532 };
1533 
1534 MODULE_DEVICE_TABLE(i2c, kmx61_id);
1535 
1536 static struct i2c_driver kmx61_driver = {
1537 	.driver = {
1538 		.name = KMX61_DRV_NAME,
1539 		.acpi_match_table = ACPI_PTR(kmx61_acpi_match),
1540 		.pm = &kmx61_pm_ops,
1541 	},
1542 	.probe		= kmx61_probe,
1543 	.remove		= kmx61_remove,
1544 	.id_table	= kmx61_id,
1545 };
1546 
1547 module_i2c_driver(kmx61_driver);
1548 
1549 MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
1550 MODULE_DESCRIPTION("KMX61 accelerometer/magnetometer driver");
1551 MODULE_LICENSE("GPL v2");
1552