xref: /openbmc/linux/drivers/iio/accel/mma9553.c (revision 3d3337de)
1 /*
2  * Freescale MMA9553L Intelligent Pedometer driver
3  * Copyright (c) 2014, Intel Corporation.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms and conditions of the GNU General Public License,
7  * version 2, as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  */
14 
15 #include <linux/module.h>
16 #include <linux/i2c.h>
17 #include <linux/interrupt.h>
18 #include <linux/slab.h>
19 #include <linux/acpi.h>
20 #include <linux/gpio/consumer.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
23 #include <linux/iio/events.h>
24 #include <linux/pm_runtime.h>
25 #include "mma9551_core.h"
26 
27 #define MMA9553_DRV_NAME			"mma9553"
28 #define MMA9553_IRQ_NAME			"mma9553_event"
29 #define MMA9553_GPIO_NAME			"mma9553_int"
30 
31 /* Pedometer configuration registers (R/W) */
32 #define MMA9553_REG_CONF_SLEEPMIN		0x00
33 #define MMA9553_REG_CONF_SLEEPMAX		0x02
34 #define MMA9553_REG_CONF_SLEEPTHD		0x04
35 #define MMA9553_MASK_CONF_WORD			GENMASK(15, 0)
36 
37 #define MMA9553_REG_CONF_CONF_STEPLEN		0x06
38 #define MMA9553_MASK_CONF_CONFIG		BIT(15)
39 #define MMA9553_MASK_CONF_ACT_DBCNTM		BIT(14)
40 #define MMA9553_MASK_CONF_SLP_DBCNTM		BIT(13)
41 #define MMA9553_MASK_CONF_STEPLEN		GENMASK(7, 0)
42 
43 #define MMA9553_REG_CONF_HEIGHT_WEIGHT		0x08
44 #define MMA9553_MASK_CONF_HEIGHT		GENMASK(15, 8)
45 #define MMA9553_MASK_CONF_WEIGHT		GENMASK(7, 0)
46 
47 #define MMA9553_REG_CONF_FILTER			0x0A
48 #define MMA9553_MASK_CONF_FILTSTEP		GENMASK(15, 8)
49 #define MMA9553_MASK_CONF_MALE			BIT(7)
50 #define MMA9553_MASK_CONF_FILTTIME		GENMASK(6, 0)
51 
52 #define MMA9553_REG_CONF_SPEED_STEP		0x0C
53 #define MMA9553_MASK_CONF_SPDPRD		GENMASK(15, 8)
54 #define MMA9553_MASK_CONF_STEPCOALESCE		GENMASK(7, 0)
55 
56 #define MMA9553_REG_CONF_ACTTHD			0x0E
57 
58 /* Pedometer status registers (R-only) */
59 #define MMA9553_REG_STATUS			0x00
60 #define MMA9553_MASK_STATUS_MRGFL		BIT(15)
61 #define MMA9553_MASK_STATUS_SUSPCHG		BIT(14)
62 #define MMA9553_MASK_STATUS_STEPCHG		BIT(13)
63 #define MMA9553_MASK_STATUS_ACTCHG		BIT(12)
64 #define MMA9553_MASK_STATUS_SUSP		BIT(11)
65 #define MMA9553_MASK_STATUS_ACTIVITY		(BIT(10) | BIT(9) | BIT(8))
66 #define MMA9553_MASK_STATUS_VERSION		0x00FF
67 
68 #define MMA9553_REG_STEPCNT			0x02
69 #define MMA9553_REG_DISTANCE			0x04
70 #define MMA9553_REG_SPEED			0x06
71 #define MMA9553_REG_CALORIES			0x08
72 #define MMA9553_REG_SLEEPCNT			0x0A
73 
74 /* Pedometer events are always mapped to this pin. */
75 #define MMA9553_DEFAULT_GPIO_PIN	mma9551_gpio6
76 #define MMA9553_DEFAULT_GPIO_POLARITY	0
77 
78 /* Bitnum used for gpio configuration = bit number in high status byte */
79 #define STATUS_TO_BITNUM(bit)		(ffs(bit) - 9)
80 
81 #define MMA9553_DEFAULT_SAMPLE_RATE	30	/* Hz */
82 
83 /*
84  * The internal activity level must be stable for ACTTHD samples before
85  * ACTIVITY is updated.The ACTIVITY variable contains the current activity
86  * level and is updated every time a step is detected or once a second
87  * if there are no steps.
88  */
89 #define MMA9553_ACTIVITY_THD_TO_SEC(thd) ((thd) / MMA9553_DEFAULT_SAMPLE_RATE)
90 #define MMA9553_ACTIVITY_SEC_TO_THD(sec) ((sec) * MMA9553_DEFAULT_SAMPLE_RATE)
91 
92 /*
93  * Autonomously suspend pedometer if acceleration vector magnitude
94  * is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
95  */
96 #define MMA9553_DEFAULT_SLEEPMIN	3688	/* 0,9 g */
97 #define MMA9553_DEFAULT_SLEEPMAX	4508	/* 1,1 g */
98 #define MMA9553_DEFAULT_SLEEPTHD	(MMA9553_DEFAULT_SAMPLE_RATE * 30)
99 
100 #define MMA9553_CONFIG_RETRIES		2
101 
102 /* Status register - activity field  */
103 enum activity_level {
104 	ACTIVITY_UNKNOWN,
105 	ACTIVITY_REST,
106 	ACTIVITY_WALKING,
107 	ACTIVITY_JOGGING,
108 	ACTIVITY_RUNNING,
109 };
110 
111 static struct mma9553_event_info {
112 	enum iio_chan_type type;
113 	enum iio_modifier mod;
114 	enum iio_event_direction dir;
115 } mma9553_events_info[] = {
116 	{
117 		.type = IIO_STEPS,
118 		.mod = IIO_NO_MOD,
119 		.dir = IIO_EV_DIR_NONE,
120 	},
121 	{
122 		.type = IIO_ACTIVITY,
123 		.mod = IIO_MOD_STILL,
124 		.dir = IIO_EV_DIR_RISING,
125 	},
126 	{
127 		.type = IIO_ACTIVITY,
128 		.mod = IIO_MOD_STILL,
129 		.dir = IIO_EV_DIR_FALLING,
130 	},
131 	{
132 		.type = IIO_ACTIVITY,
133 		.mod = IIO_MOD_WALKING,
134 		.dir = IIO_EV_DIR_RISING,
135 	},
136 	{
137 		.type = IIO_ACTIVITY,
138 		.mod = IIO_MOD_WALKING,
139 		.dir = IIO_EV_DIR_FALLING,
140 	},
141 	{
142 		.type = IIO_ACTIVITY,
143 		.mod = IIO_MOD_JOGGING,
144 		.dir = IIO_EV_DIR_RISING,
145 	},
146 	{
147 		.type = IIO_ACTIVITY,
148 		.mod = IIO_MOD_JOGGING,
149 		.dir = IIO_EV_DIR_FALLING,
150 	},
151 	{
152 		.type = IIO_ACTIVITY,
153 		.mod = IIO_MOD_RUNNING,
154 		.dir = IIO_EV_DIR_RISING,
155 	},
156 	{
157 		.type = IIO_ACTIVITY,
158 		.mod = IIO_MOD_RUNNING,
159 		.dir = IIO_EV_DIR_FALLING,
160 	},
161 };
162 
163 #define MMA9553_EVENTS_INFO_SIZE ARRAY_SIZE(mma9553_events_info)
164 
165 struct mma9553_event {
166 	struct mma9553_event_info *info;
167 	bool enabled;
168 };
169 
170 struct mma9553_conf_regs {
171 	u16 sleepmin;
172 	u16 sleepmax;
173 	u16 sleepthd;
174 	u16 config;
175 	u16 height_weight;
176 	u16 filter;
177 	u16 speed_step;
178 	u16 actthd;
179 } __packed;
180 
181 struct mma9553_data {
182 	struct i2c_client *client;
183 	struct mutex mutex;
184 	struct mma9553_conf_regs conf;
185 	struct mma9553_event events[MMA9553_EVENTS_INFO_SIZE];
186 	int num_events;
187 	u8 gpio_bitnum;
188 	/*
189 	 * This is used for all features that depend on step count:
190 	 * step count, distance, speed, calories.
191 	 */
192 	bool stepcnt_enabled;
193 	u16 stepcnt;
194 	u8 activity;
195 	s64 timestamp;
196 };
197 
198 static u8 mma9553_get_bits(u16 val, u16 mask)
199 {
200 	return (val & mask) >> (ffs(mask) - 1);
201 }
202 
203 static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
204 {
205 	return (current_val & ~mask) | (val << (ffs(mask) - 1));
206 }
207 
208 static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
209 {
210 	switch (activity) {
211 	case ACTIVITY_RUNNING:
212 		return IIO_MOD_RUNNING;
213 	case ACTIVITY_JOGGING:
214 		return IIO_MOD_JOGGING;
215 	case ACTIVITY_WALKING:
216 		return IIO_MOD_WALKING;
217 	case ACTIVITY_REST:
218 		return IIO_MOD_STILL;
219 	case ACTIVITY_UNKNOWN:
220 	default:
221 		return IIO_NO_MOD;
222 	}
223 }
224 
225 static void mma9553_init_events(struct mma9553_data *data)
226 {
227 	int i;
228 
229 	data->num_events = MMA9553_EVENTS_INFO_SIZE;
230 	for (i = 0; i < data->num_events; i++) {
231 		data->events[i].info = &mma9553_events_info[i];
232 		data->events[i].enabled = false;
233 	}
234 }
235 
236 static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
237 					       enum iio_chan_type type,
238 					       enum iio_modifier mod,
239 					       enum iio_event_direction dir)
240 {
241 	int i;
242 
243 	for (i = 0; i < data->num_events; i++)
244 		if (data->events[i].info->type == type &&
245 		    data->events[i].info->mod == mod &&
246 		    data->events[i].info->dir == dir)
247 			return &data->events[i];
248 
249 	return NULL;
250 }
251 
252 static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
253 					 bool check_type,
254 					 enum iio_chan_type type)
255 {
256 	int i;
257 
258 	for (i = 0; i < data->num_events; i++)
259 		if ((check_type && data->events[i].info->type == type &&
260 		     data->events[i].enabled) ||
261 		     (!check_type && data->events[i].enabled))
262 			return true;
263 
264 	return false;
265 }
266 
267 static int mma9553_set_config(struct mma9553_data *data, u16 reg,
268 			      u16 *p_reg_val, u16 val, u16 mask)
269 {
270 	int ret, retries;
271 	u16 reg_val, config;
272 
273 	reg_val = *p_reg_val;
274 	if (val == mma9553_get_bits(reg_val, mask))
275 		return 0;
276 
277 	reg_val = mma9553_set_bits(reg_val, val, mask);
278 	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
279 					reg, reg_val);
280 	if (ret < 0) {
281 		dev_err(&data->client->dev,
282 			"error writing config register 0x%x\n", reg);
283 		return ret;
284 	}
285 
286 	*p_reg_val = reg_val;
287 
288 	/* Reinitializes the pedometer with current configuration values */
289 	config = mma9553_set_bits(data->conf.config, 1,
290 				  MMA9553_MASK_CONF_CONFIG);
291 
292 	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
293 					MMA9553_REG_CONF_CONF_STEPLEN, config);
294 	if (ret < 0) {
295 		dev_err(&data->client->dev,
296 			"error writing config register 0x%x\n",
297 			MMA9553_REG_CONF_CONF_STEPLEN);
298 		return ret;
299 	}
300 
301 	retries = MMA9553_CONFIG_RETRIES;
302 	do {
303 		mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
304 		ret = mma9551_read_config_word(data->client,
305 					       MMA9551_APPID_PEDOMETER,
306 					       MMA9553_REG_CONF_CONF_STEPLEN,
307 					       &config);
308 		if (ret < 0)
309 			return ret;
310 	} while (mma9553_get_bits(config, MMA9553_MASK_CONF_CONFIG) &&
311 		 --retries > 0);
312 
313 	return 0;
314 }
315 
316 static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
317 					 u8 *activity, u16 *stepcnt)
318 {
319 	u32 status_stepcnt;
320 	u16 status;
321 	int ret;
322 
323 	ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
324 					MMA9553_REG_STATUS, sizeof(u32),
325 					(u16 *) &status_stepcnt);
326 	if (ret < 0) {
327 		dev_err(&data->client->dev,
328 			"error reading status and stepcnt\n");
329 		return ret;
330 	}
331 
332 	status = status_stepcnt & MMA9553_MASK_CONF_WORD;
333 	*activity = mma9553_get_bits(status, MMA9553_MASK_STATUS_ACTIVITY);
334 	*stepcnt = status_stepcnt >> 16;
335 
336 	return 0;
337 }
338 
339 static int mma9553_conf_gpio(struct mma9553_data *data)
340 {
341 	u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
342 	int ret;
343 	struct mma9553_event *ev_step_detect;
344 	bool activity_enabled;
345 
346 	activity_enabled =
347 	    mma9553_is_any_event_enabled(data, true, IIO_ACTIVITY);
348 	ev_step_detect =
349 	    mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD, IIO_EV_DIR_NONE);
350 
351 	/*
352 	 * If both step detector and activity are enabled, use the MRGFL bit.
353 	 * This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
354 	 */
355 	if (activity_enabled && ev_step_detect->enabled)
356 		bitnum = STATUS_TO_BITNUM(MMA9553_MASK_STATUS_MRGFL);
357 	else if (ev_step_detect->enabled)
358 		bitnum = STATUS_TO_BITNUM(MMA9553_MASK_STATUS_STEPCHG);
359 	else if (activity_enabled)
360 		bitnum = STATUS_TO_BITNUM(MMA9553_MASK_STATUS_ACTCHG);
361 	else			/* Reset */
362 		appid = MMA9551_APPID_NONE;
363 
364 	if (data->gpio_bitnum == bitnum)
365 		return 0;
366 
367 	/* Save initial values for activity and stepcnt */
368 	if (activity_enabled || ev_step_detect->enabled)
369 		mma9553_read_activity_stepcnt(data, &data->activity,
370 					      &data->stepcnt);
371 
372 	ret = mma9551_gpio_config(data->client,
373 				  MMA9553_DEFAULT_GPIO_PIN,
374 				  appid, bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
375 	if (ret < 0)
376 		return ret;
377 	data->gpio_bitnum = bitnum;
378 
379 	return 0;
380 }
381 
382 static int mma9553_init(struct mma9553_data *data)
383 {
384 	int ret;
385 
386 	ret = mma9551_read_version(data->client);
387 	if (ret)
388 		return ret;
389 
390 	/*
391 	 * Read all the pedometer configuration registers. This is used as
392 	 * a device identification command to differentiate the MMA9553L
393 	 * from the MMA9550L.
394 	 */
395 	ret =
396 	    mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
397 				      MMA9553_REG_CONF_SLEEPMIN,
398 				      sizeof(data->conf), (u16 *) &data->conf);
399 	if (ret < 0) {
400 		dev_err(&data->client->dev,
401 			"device is not MMA9553L: failed to read cfg regs\n");
402 		return ret;
403 	}
404 
405 
406 	/* Reset gpio */
407 	data->gpio_bitnum = -1;
408 	ret = mma9553_conf_gpio(data);
409 	if (ret < 0)
410 		return ret;
411 
412 	ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
413 	if (ret < 0)
414 		return ret;
415 
416 	/* Init config registers */
417 	data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
418 	data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
419 	data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
420 	data->conf.config =
421 	    mma9553_set_bits(data->conf.config, 1, MMA9553_MASK_CONF_CONFIG);
422 	/*
423 	 * Clear the activity debounce counter when the activity level changes,
424 	 * so that the confidence level applies for any activity level.
425 	 */
426 	data->conf.config = mma9553_set_bits(data->conf.config, 1,
427 					     MMA9553_MASK_CONF_ACT_DBCNTM);
428 	ret =
429 	    mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
430 				       MMA9553_REG_CONF_SLEEPMIN,
431 				       sizeof(data->conf), (u16 *) &data->conf);
432 	if (ret < 0) {
433 		dev_err(&data->client->dev,
434 			"failed to write configuration registers\n");
435 		return ret;
436 	}
437 
438 	return mma9551_set_device_state(data->client, true);
439 }
440 
441 static int mma9553_read_raw(struct iio_dev *indio_dev,
442 			    struct iio_chan_spec const *chan,
443 			    int *val, int *val2, long mask)
444 {
445 	struct mma9553_data *data = iio_priv(indio_dev);
446 	int ret;
447 	u16 tmp;
448 	u8 activity;
449 	bool powered_on;
450 
451 	switch (mask) {
452 	case IIO_CHAN_INFO_PROCESSED:
453 		switch (chan->type) {
454 		case IIO_STEPS:
455 			/*
456 			 * The HW only counts steps and other dependent
457 			 * parameters (speed, distance, calories, activity)
458 			 * if power is on (from enabling an event or the
459 			 * step counter */
460 			powered_on =
461 			    mma9553_is_any_event_enabled(data, false, 0) ||
462 			    data->stepcnt_enabled;
463 			if (!powered_on) {
464 				dev_err(&data->client->dev,
465 					"No channels enabled\n");
466 				return -EINVAL;
467 			}
468 			mutex_lock(&data->mutex);
469 			ret = mma9551_read_status_word(data->client,
470 						       MMA9551_APPID_PEDOMETER,
471 						       MMA9553_REG_STEPCNT,
472 						       &tmp);
473 			mutex_unlock(&data->mutex);
474 			if (ret < 0)
475 				return ret;
476 			*val = tmp;
477 			return IIO_VAL_INT;
478 		case IIO_DISTANCE:
479 			powered_on =
480 			    mma9553_is_any_event_enabled(data, false, 0) ||
481 			    data->stepcnt_enabled;
482 			if (!powered_on) {
483 				dev_err(&data->client->dev,
484 					"No channels enabled\n");
485 				return -EINVAL;
486 			}
487 			mutex_lock(&data->mutex);
488 			ret = mma9551_read_status_word(data->client,
489 						       MMA9551_APPID_PEDOMETER,
490 						       MMA9553_REG_DISTANCE,
491 						       &tmp);
492 			mutex_unlock(&data->mutex);
493 			if (ret < 0)
494 				return ret;
495 			*val = tmp;
496 			return IIO_VAL_INT;
497 		case IIO_ACTIVITY:
498 			powered_on =
499 			    mma9553_is_any_event_enabled(data, false, 0) ||
500 			    data->stepcnt_enabled;
501 			if (!powered_on) {
502 				dev_err(&data->client->dev,
503 					"No channels enabled\n");
504 				return -EINVAL;
505 			}
506 			mutex_lock(&data->mutex);
507 			ret = mma9551_read_status_word(data->client,
508 						       MMA9551_APPID_PEDOMETER,
509 						       MMA9553_REG_STATUS,
510 						       &tmp);
511 			mutex_unlock(&data->mutex);
512 			if (ret < 0)
513 				return ret;
514 
515 			activity =
516 			    mma9553_get_bits(tmp, MMA9553_MASK_STATUS_ACTIVITY);
517 
518 			/*
519 			 * The device does not support confidence value levels,
520 			 * so we will always have 100% for current activity and
521 			 * 0% for the others.
522 			 */
523 			if (chan->channel2 == mma9553_activity_to_mod(activity))
524 				*val = 100;
525 			else
526 				*val = 0;
527 			return IIO_VAL_INT;
528 		default:
529 			return -EINVAL;
530 		}
531 	case IIO_CHAN_INFO_RAW:
532 		switch (chan->type) {
533 		case IIO_VELOCITY:	/* m/h */
534 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
535 				return -EINVAL;
536 			powered_on =
537 			    mma9553_is_any_event_enabled(data, false, 0) ||
538 			    data->stepcnt_enabled;
539 			if (!powered_on) {
540 				dev_err(&data->client->dev,
541 					"No channels enabled\n");
542 				return -EINVAL;
543 			}
544 			mutex_lock(&data->mutex);
545 			ret = mma9551_read_status_word(data->client,
546 						       MMA9551_APPID_PEDOMETER,
547 						       MMA9553_REG_SPEED, &tmp);
548 			mutex_unlock(&data->mutex);
549 			if (ret < 0)
550 				return ret;
551 			*val = tmp;
552 			return IIO_VAL_INT;
553 		case IIO_ENERGY:	/* Cal or kcal */
554 			powered_on =
555 			    mma9553_is_any_event_enabled(data, false, 0) ||
556 			    data->stepcnt_enabled;
557 			if (!powered_on) {
558 				dev_err(&data->client->dev,
559 					"No channels enabled\n");
560 				return -EINVAL;
561 			}
562 			mutex_lock(&data->mutex);
563 			ret = mma9551_read_status_word(data->client,
564 						       MMA9551_APPID_PEDOMETER,
565 						       MMA9553_REG_CALORIES,
566 						       &tmp);
567 			mutex_unlock(&data->mutex);
568 			if (ret < 0)
569 				return ret;
570 			*val = tmp;
571 			return IIO_VAL_INT;
572 		case IIO_ACCEL:
573 			mutex_lock(&data->mutex);
574 			ret = mma9551_read_accel_chan(data->client,
575 						      chan, val, val2);
576 			mutex_unlock(&data->mutex);
577 			return ret;
578 		default:
579 			return -EINVAL;
580 		}
581 	case IIO_CHAN_INFO_SCALE:
582 		switch (chan->type) {
583 		case IIO_VELOCITY:	/* m/h to m/s */
584 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
585 				return -EINVAL;
586 			*val = 0;
587 			*val2 = 277;	/* 0.000277 */
588 			return IIO_VAL_INT_PLUS_MICRO;
589 		case IIO_ENERGY:	/* Cal or kcal to J */
590 			*val = 4184;
591 			return IIO_VAL_INT;
592 		case IIO_ACCEL:
593 			return mma9551_read_accel_scale(val, val2);
594 		default:
595 			return -EINVAL;
596 		}
597 	case IIO_CHAN_INFO_ENABLE:
598 		*val = data->stepcnt_enabled;
599 		return IIO_VAL_INT;
600 	case IIO_CHAN_INFO_CALIBHEIGHT:
601 		tmp = mma9553_get_bits(data->conf.height_weight,
602 					MMA9553_MASK_CONF_HEIGHT);
603 		*val = tmp / 100;	/* cm to m */
604 		*val2 = (tmp % 100) * 10000;
605 		return IIO_VAL_INT_PLUS_MICRO;
606 	case IIO_CHAN_INFO_CALIBWEIGHT:
607 		*val = mma9553_get_bits(data->conf.height_weight,
608 					MMA9553_MASK_CONF_WEIGHT);
609 		return IIO_VAL_INT;
610 	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
611 		switch (chan->type) {
612 		case IIO_STEPS:
613 			*val = mma9553_get_bits(data->conf.filter,
614 						MMA9553_MASK_CONF_FILTSTEP);
615 			return IIO_VAL_INT;
616 		default:
617 			return -EINVAL;
618 		}
619 	case IIO_CHAN_INFO_DEBOUNCE_TIME:
620 		switch (chan->type) {
621 		case IIO_STEPS:
622 			*val = mma9553_get_bits(data->conf.filter,
623 						MMA9553_MASK_CONF_FILTTIME);
624 			return IIO_VAL_INT;
625 		default:
626 			return -EINVAL;
627 		}
628 	case IIO_CHAN_INFO_INT_TIME:
629 		switch (chan->type) {
630 		case IIO_VELOCITY:
631 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
632 				return -EINVAL;
633 			*val = mma9553_get_bits(data->conf.speed_step,
634 						MMA9553_MASK_CONF_SPDPRD);
635 			return IIO_VAL_INT;
636 		default:
637 			return -EINVAL;
638 		}
639 	default:
640 		return -EINVAL;
641 	}
642 }
643 
644 static int mma9553_write_raw(struct iio_dev *indio_dev,
645 			     struct iio_chan_spec const *chan,
646 			     int val, int val2, long mask)
647 {
648 	struct mma9553_data *data = iio_priv(indio_dev);
649 	int ret, tmp;
650 
651 	switch (mask) {
652 	case IIO_CHAN_INFO_ENABLE:
653 		if (data->stepcnt_enabled == !!val)
654 			return 0;
655 		mutex_lock(&data->mutex);
656 		ret = mma9551_set_power_state(data->client, val);
657 		if (ret < 0) {
658 			mutex_unlock(&data->mutex);
659 			return ret;
660 		}
661 		data->stepcnt_enabled = val;
662 		mutex_unlock(&data->mutex);
663 		return 0;
664 	case IIO_CHAN_INFO_CALIBHEIGHT:
665 		/* m to cm */
666 		tmp = val * 100 + val2 / 10000;
667 		if (tmp < 0 || tmp > 255)
668 			return -EINVAL;
669 		mutex_lock(&data->mutex);
670 		ret = mma9553_set_config(data,
671 					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
672 					 &data->conf.height_weight,
673 					 tmp, MMA9553_MASK_CONF_HEIGHT);
674 		mutex_unlock(&data->mutex);
675 		return ret;
676 	case IIO_CHAN_INFO_CALIBWEIGHT:
677 		if (val < 0 || val > 255)
678 			return -EINVAL;
679 		mutex_lock(&data->mutex);
680 		ret = mma9553_set_config(data,
681 					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
682 					 &data->conf.height_weight,
683 					 val, MMA9553_MASK_CONF_WEIGHT);
684 		mutex_unlock(&data->mutex);
685 		return ret;
686 	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
687 		switch (chan->type) {
688 		case IIO_STEPS:
689 			/*
690 			 * Set to 0 to disable step filtering. If the value
691 			 * specified is greater than 6, then 6 will be used.
692 			 */
693 			if (val < 0)
694 				return -EINVAL;
695 			if (val > 6)
696 				val = 6;
697 			mutex_lock(&data->mutex);
698 			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
699 						 &data->conf.filter, val,
700 						 MMA9553_MASK_CONF_FILTSTEP);
701 			mutex_unlock(&data->mutex);
702 			return ret;
703 		default:
704 			return -EINVAL;
705 		}
706 	case IIO_CHAN_INFO_DEBOUNCE_TIME:
707 		switch (chan->type) {
708 		case IIO_STEPS:
709 			if (val < 0 || val > 127)
710 				return -EINVAL;
711 			mutex_lock(&data->mutex);
712 			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
713 						 &data->conf.filter, val,
714 						 MMA9553_MASK_CONF_FILTTIME);
715 			mutex_unlock(&data->mutex);
716 			return ret;
717 		default:
718 			return -EINVAL;
719 		}
720 	case IIO_CHAN_INFO_INT_TIME:
721 		switch (chan->type) {
722 		case IIO_VELOCITY:
723 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
724 				return -EINVAL;
725 			/*
726 			 * If set to a value greater than 5, then 5 will be
727 			 * used. Warning: Do not set SPDPRD to 0 or 1 as
728 			 * this may cause undesirable behavior.
729 			 */
730 			if (val < 2)
731 				return -EINVAL;
732 			if (val > 5)
733 				val = 5;
734 			mutex_lock(&data->mutex);
735 			ret = mma9553_set_config(data,
736 						 MMA9553_REG_CONF_SPEED_STEP,
737 						 &data->conf.speed_step, val,
738 						 MMA9553_MASK_CONF_SPDPRD);
739 			mutex_unlock(&data->mutex);
740 			return ret;
741 		default:
742 			return -EINVAL;
743 		}
744 	default:
745 		return -EINVAL;
746 	}
747 }
748 
749 static int mma9553_read_event_config(struct iio_dev *indio_dev,
750 				     const struct iio_chan_spec *chan,
751 				     enum iio_event_type type,
752 				     enum iio_event_direction dir)
753 {
754 
755 	struct mma9553_data *data = iio_priv(indio_dev);
756 	struct mma9553_event *event;
757 
758 	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
759 	if (!event)
760 		return -EINVAL;
761 
762 	return event->enabled;
763 }
764 
765 static int mma9553_write_event_config(struct iio_dev *indio_dev,
766 				      const struct iio_chan_spec *chan,
767 				      enum iio_event_type type,
768 				      enum iio_event_direction dir, int state)
769 {
770 	struct mma9553_data *data = iio_priv(indio_dev);
771 	struct mma9553_event *event;
772 	int ret;
773 
774 	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
775 	if (!event)
776 		return -EINVAL;
777 
778 	if (event->enabled == state)
779 		return 0;
780 
781 	mutex_lock(&data->mutex);
782 
783 	ret = mma9551_set_power_state(data->client, state);
784 	if (ret < 0)
785 		goto err_out;
786 	event->enabled = state;
787 
788 	ret = mma9553_conf_gpio(data);
789 	if (ret < 0)
790 		goto err_conf_gpio;
791 
792 	mutex_unlock(&data->mutex);
793 
794 	return ret;
795 
796 err_conf_gpio:
797 	if (state) {
798 		event->enabled = false;
799 		mma9551_set_power_state(data->client, false);
800 	}
801 err_out:
802 	mutex_unlock(&data->mutex);
803 	return ret;
804 }
805 
806 static int mma9553_read_event_value(struct iio_dev *indio_dev,
807 				    const struct iio_chan_spec *chan,
808 				    enum iio_event_type type,
809 				    enum iio_event_direction dir,
810 				    enum iio_event_info info,
811 				    int *val, int *val2)
812 {
813 	struct mma9553_data *data = iio_priv(indio_dev);
814 
815 	*val2 = 0;
816 	switch (info) {
817 	case IIO_EV_INFO_VALUE:
818 		switch (chan->type) {
819 		case IIO_STEPS:
820 			*val = mma9553_get_bits(data->conf.speed_step,
821 						MMA9553_MASK_CONF_STEPCOALESCE);
822 			return IIO_VAL_INT;
823 		case IIO_ACTIVITY:
824 			/*
825 			 * The device does not support confidence value levels.
826 			 * We set an average of 50%.
827 			 */
828 			*val = 50;
829 			return IIO_VAL_INT;
830 		default:
831 			return -EINVAL;
832 		}
833 	case IIO_EV_INFO_PERIOD:
834 		switch (chan->type) {
835 		case IIO_ACTIVITY:
836 			*val = MMA9553_ACTIVITY_THD_TO_SEC(data->conf.actthd);
837 			return IIO_VAL_INT;
838 		default:
839 			return -EINVAL;
840 		}
841 	default:
842 		return -EINVAL;
843 	}
844 }
845 
846 static int mma9553_write_event_value(struct iio_dev *indio_dev,
847 				     const struct iio_chan_spec *chan,
848 				     enum iio_event_type type,
849 				     enum iio_event_direction dir,
850 				     enum iio_event_info info,
851 				     int val, int val2)
852 {
853 	struct mma9553_data *data = iio_priv(indio_dev);
854 	int ret;
855 
856 	switch (info) {
857 	case IIO_EV_INFO_VALUE:
858 		switch (chan->type) {
859 		case IIO_STEPS:
860 			if (val < 0 || val > 255)
861 				return -EINVAL;
862 			mutex_lock(&data->mutex);
863 			ret = mma9553_set_config(data,
864 						MMA9553_REG_CONF_SPEED_STEP,
865 						&data->conf.speed_step, val,
866 						MMA9553_MASK_CONF_STEPCOALESCE);
867 			mutex_unlock(&data->mutex);
868 			return ret;
869 		default:
870 			return -EINVAL;
871 		}
872 	case IIO_EV_INFO_PERIOD:
873 		switch (chan->type) {
874 		case IIO_ACTIVITY:
875 			mutex_lock(&data->mutex);
876 			ret = mma9553_set_config(data, MMA9553_REG_CONF_ACTTHD,
877 						 &data->conf.actthd,
878 						 MMA9553_ACTIVITY_SEC_TO_THD
879 						 (val), MMA9553_MASK_CONF_WORD);
880 			mutex_unlock(&data->mutex);
881 			return ret;
882 		default:
883 			return -EINVAL;
884 		}
885 	default:
886 		return -EINVAL;
887 	}
888 }
889 
890 static int mma9553_get_calibgender_mode(struct iio_dev *indio_dev,
891 					const struct iio_chan_spec *chan)
892 {
893 	struct mma9553_data *data = iio_priv(indio_dev);
894 	u8 gender;
895 
896 	gender = mma9553_get_bits(data->conf.filter, MMA9553_MASK_CONF_MALE);
897 	/*
898 	 * HW expects 0 for female and 1 for male,
899 	 * while iio index is 0 for male and 1 for female
900 	 */
901 	return !gender;
902 }
903 
904 static int mma9553_set_calibgender_mode(struct iio_dev *indio_dev,
905 					const struct iio_chan_spec *chan,
906 					unsigned int mode)
907 {
908 	struct mma9553_data *data = iio_priv(indio_dev);
909 	u8 gender = !mode;
910 	int ret;
911 
912 	if ((mode != 0) && (mode != 1))
913 		return -EINVAL;
914 	mutex_lock(&data->mutex);
915 	ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
916 				 &data->conf.filter, gender,
917 				 MMA9553_MASK_CONF_MALE);
918 	mutex_unlock(&data->mutex);
919 
920 	return ret;
921 }
922 
923 static const struct iio_event_spec mma9553_step_event = {
924 	.type = IIO_EV_TYPE_CHANGE,
925 	.dir = IIO_EV_DIR_NONE,
926 	.mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
927 };
928 
929 static const struct iio_event_spec mma9553_activity_events[] = {
930 	{
931 		.type = IIO_EV_TYPE_THRESH,
932 		.dir = IIO_EV_DIR_RISING,
933 		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
934 				 BIT(IIO_EV_INFO_VALUE) |
935 				 BIT(IIO_EV_INFO_PERIOD),
936 	 },
937 	{
938 		.type = IIO_EV_TYPE_THRESH,
939 		.dir = IIO_EV_DIR_FALLING,
940 		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
941 				 BIT(IIO_EV_INFO_VALUE) |
942 				 BIT(IIO_EV_INFO_PERIOD),
943 	},
944 };
945 
946 static const char * const calibgender_modes[] = { "male", "female" };
947 
948 static const struct iio_enum mma9553_calibgender_enum = {
949 	.items = calibgender_modes,
950 	.num_items = ARRAY_SIZE(calibgender_modes),
951 	.get = mma9553_get_calibgender_mode,
952 	.set = mma9553_set_calibgender_mode,
953 };
954 
955 static const struct iio_chan_spec_ext_info mma9553_ext_info[] = {
956 	IIO_ENUM("calibgender", IIO_SHARED_BY_TYPE, &mma9553_calibgender_enum),
957 	IIO_ENUM_AVAILABLE("calibgender", &mma9553_calibgender_enum),
958 	{},
959 };
960 
961 #define MMA9553_PEDOMETER_CHANNEL(_type, _mask) {		\
962 	.type = _type,						\
963 	.info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE)      |	\
964 			      BIT(IIO_CHAN_INFO_CALIBHEIGHT) |	\
965 			      _mask,				\
966 	.ext_info = mma9553_ext_info,				\
967 }
968 
969 #define MMA9553_ACTIVITY_CHANNEL(_chan2) {				\
970 	.type = IIO_ACTIVITY,						\
971 	.modified = 1,							\
972 	.channel2 = _chan2,						\
973 	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),		\
974 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT),	\
975 	.event_spec = mma9553_activity_events,				\
976 	.num_event_specs = ARRAY_SIZE(mma9553_activity_events),		\
977 	.ext_info = mma9553_ext_info,					\
978 }
979 
980 static const struct iio_chan_spec mma9553_channels[] = {
981 	MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
982 	MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
983 	MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
984 
985 	{
986 		.type = IIO_STEPS,
987 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
988 				     BIT(IIO_CHAN_INFO_ENABLE) |
989 				     BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
990 				     BIT(IIO_CHAN_INFO_DEBOUNCE_TIME),
991 		.event_spec = &mma9553_step_event,
992 		.num_event_specs = 1,
993 	},
994 
995 	MMA9553_PEDOMETER_CHANNEL(IIO_DISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
996 	{
997 		.type = IIO_VELOCITY,
998 		.modified = 1,
999 		.channel2 = IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
1000 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
1001 				      BIT(IIO_CHAN_INFO_SCALE) |
1002 				      BIT(IIO_CHAN_INFO_INT_TIME) |
1003 				      BIT(IIO_CHAN_INFO_ENABLE),
1004 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT),
1005 		.ext_info = mma9553_ext_info,
1006 	},
1007 	MMA9553_PEDOMETER_CHANNEL(IIO_ENERGY, BIT(IIO_CHAN_INFO_RAW) |
1008 				  BIT(IIO_CHAN_INFO_SCALE) |
1009 				  BIT(IIO_CHAN_INFO_CALIBWEIGHT)),
1010 
1011 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
1012 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_JOGGING),
1013 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
1014 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_STILL),
1015 };
1016 
1017 static const struct iio_info mma9553_info = {
1018 	.driver_module = THIS_MODULE,
1019 	.read_raw = mma9553_read_raw,
1020 	.write_raw = mma9553_write_raw,
1021 	.read_event_config = mma9553_read_event_config,
1022 	.write_event_config = mma9553_write_event_config,
1023 	.read_event_value = mma9553_read_event_value,
1024 	.write_event_value = mma9553_write_event_value,
1025 };
1026 
1027 static irqreturn_t mma9553_irq_handler(int irq, void *private)
1028 {
1029 	struct iio_dev *indio_dev = private;
1030 	struct mma9553_data *data = iio_priv(indio_dev);
1031 
1032 	data->timestamp = iio_get_time_ns();
1033 	/*
1034 	 * Since we only configure the interrupt pin when an
1035 	 * event is enabled, we are sure we have at least
1036 	 * one event enabled at this point.
1037 	 */
1038 	return IRQ_WAKE_THREAD;
1039 }
1040 
1041 static irqreturn_t mma9553_event_handler(int irq, void *private)
1042 {
1043 	struct iio_dev *indio_dev = private;
1044 	struct mma9553_data *data = iio_priv(indio_dev);
1045 	u16 stepcnt;
1046 	u8 activity;
1047 	struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
1048 	int ret;
1049 
1050 	mutex_lock(&data->mutex);
1051 	ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
1052 	if (ret < 0) {
1053 		mutex_unlock(&data->mutex);
1054 		return IRQ_HANDLED;
1055 	}
1056 
1057 	ev_prev_activity =
1058 	    mma9553_get_event(data, IIO_ACTIVITY,
1059 			      mma9553_activity_to_mod(data->activity),
1060 			      IIO_EV_DIR_FALLING);
1061 	ev_activity =
1062 	    mma9553_get_event(data, IIO_ACTIVITY,
1063 			      mma9553_activity_to_mod(activity),
1064 			      IIO_EV_DIR_RISING);
1065 	ev_step_detect =
1066 	    mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD, IIO_EV_DIR_NONE);
1067 
1068 	if (ev_step_detect->enabled && (stepcnt != data->stepcnt)) {
1069 		data->stepcnt = stepcnt;
1070 		iio_push_event(indio_dev,
1071 			       IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
1072 			       IIO_EV_DIR_NONE, IIO_EV_TYPE_CHANGE, 0, 0, 0),
1073 			       data->timestamp);
1074 	}
1075 
1076 	if (activity != data->activity) {
1077 		data->activity = activity;
1078 		/* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
1079 		if (ev_prev_activity && ev_prev_activity->enabled)
1080 			iio_push_event(indio_dev,
1081 				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1082 				       ev_prev_activity->info->mod,
1083 				       IIO_EV_DIR_FALLING,
1084 				       IIO_EV_TYPE_THRESH, 0, 0, 0),
1085 				       data->timestamp);
1086 
1087 		if (ev_activity && ev_activity->enabled)
1088 			iio_push_event(indio_dev,
1089 				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1090 				       ev_activity->info->mod,
1091 				       IIO_EV_DIR_RISING,
1092 				       IIO_EV_TYPE_THRESH, 0, 0, 0),
1093 				       data->timestamp);
1094 	}
1095 	mutex_unlock(&data->mutex);
1096 
1097 	return IRQ_HANDLED;
1098 }
1099 
1100 static int mma9553_gpio_probe(struct i2c_client *client)
1101 {
1102 	struct device *dev;
1103 	struct gpio_desc *gpio;
1104 	int ret;
1105 
1106 	if (!client)
1107 		return -EINVAL;
1108 
1109 	dev = &client->dev;
1110 
1111 	/* data ready gpio interrupt pin */
1112 	gpio = devm_gpiod_get_index(dev, MMA9553_GPIO_NAME, 0, GPIOD_IN);
1113 	if (IS_ERR(gpio)) {
1114 		dev_err(dev, "acpi gpio get index failed\n");
1115 		return PTR_ERR(gpio);
1116 	}
1117 
1118 	ret = gpiod_to_irq(gpio);
1119 
1120 	dev_dbg(dev, "gpio resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
1121 
1122 	return ret;
1123 }
1124 
1125 static const char *mma9553_match_acpi_device(struct device *dev)
1126 {
1127 	const struct acpi_device_id *id;
1128 
1129 	id = acpi_match_device(dev->driver->acpi_match_table, dev);
1130 	if (!id)
1131 		return NULL;
1132 
1133 	return dev_name(dev);
1134 }
1135 
1136 static int mma9553_probe(struct i2c_client *client,
1137 			 const struct i2c_device_id *id)
1138 {
1139 	struct mma9553_data *data;
1140 	struct iio_dev *indio_dev;
1141 	const char *name = NULL;
1142 	int ret;
1143 
1144 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1145 	if (!indio_dev)
1146 		return -ENOMEM;
1147 
1148 	data = iio_priv(indio_dev);
1149 	i2c_set_clientdata(client, indio_dev);
1150 	data->client = client;
1151 
1152 	if (id)
1153 		name = id->name;
1154 	else if (ACPI_HANDLE(&client->dev))
1155 		name = mma9553_match_acpi_device(&client->dev);
1156 	else
1157 		return -ENOSYS;
1158 
1159 	mutex_init(&data->mutex);
1160 	mma9553_init_events(data);
1161 
1162 	ret = mma9553_init(data);
1163 	if (ret < 0)
1164 		return ret;
1165 
1166 	indio_dev->dev.parent = &client->dev;
1167 	indio_dev->channels = mma9553_channels;
1168 	indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
1169 	indio_dev->name = name;
1170 	indio_dev->modes = INDIO_DIRECT_MODE;
1171 	indio_dev->info = &mma9553_info;
1172 
1173 	if (client->irq < 0)
1174 		client->irq = mma9553_gpio_probe(client);
1175 
1176 	if (client->irq >= 0) {
1177 		ret = devm_request_threaded_irq(&client->dev, client->irq,
1178 						mma9553_irq_handler,
1179 						mma9553_event_handler,
1180 						IRQF_TRIGGER_RISING,
1181 						MMA9553_IRQ_NAME, indio_dev);
1182 		if (ret < 0) {
1183 			dev_err(&client->dev, "request irq %d failed\n",
1184 				client->irq);
1185 			goto out_poweroff;
1186 		}
1187 
1188 	}
1189 
1190 	ret = iio_device_register(indio_dev);
1191 	if (ret < 0) {
1192 		dev_err(&client->dev, "unable to register iio device\n");
1193 		goto out_poweroff;
1194 	}
1195 
1196 	ret = pm_runtime_set_active(&client->dev);
1197 	if (ret < 0)
1198 		goto out_iio_unregister;
1199 
1200 	pm_runtime_enable(&client->dev);
1201 	pm_runtime_set_autosuspend_delay(&client->dev,
1202 					 MMA9551_AUTO_SUSPEND_DELAY_MS);
1203 	pm_runtime_use_autosuspend(&client->dev);
1204 
1205 	dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
1206 
1207 	return 0;
1208 
1209 out_iio_unregister:
1210 	iio_device_unregister(indio_dev);
1211 out_poweroff:
1212 	mma9551_set_device_state(client, false);
1213 	return ret;
1214 }
1215 
1216 static int mma9553_remove(struct i2c_client *client)
1217 {
1218 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
1219 	struct mma9553_data *data = iio_priv(indio_dev);
1220 
1221 	pm_runtime_disable(&client->dev);
1222 	pm_runtime_set_suspended(&client->dev);
1223 	pm_runtime_put_noidle(&client->dev);
1224 
1225 	iio_device_unregister(indio_dev);
1226 	mutex_lock(&data->mutex);
1227 	mma9551_set_device_state(data->client, false);
1228 	mutex_unlock(&data->mutex);
1229 
1230 	return 0;
1231 }
1232 
1233 #ifdef CONFIG_PM
1234 static int mma9553_runtime_suspend(struct device *dev)
1235 {
1236 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1237 	struct mma9553_data *data = iio_priv(indio_dev);
1238 	int ret;
1239 
1240 	mutex_lock(&data->mutex);
1241 	ret = mma9551_set_device_state(data->client, false);
1242 	mutex_unlock(&data->mutex);
1243 	if (ret < 0) {
1244 		dev_err(&data->client->dev, "powering off device failed\n");
1245 		return -EAGAIN;
1246 	}
1247 
1248 	return 0;
1249 }
1250 
1251 static int mma9553_runtime_resume(struct device *dev)
1252 {
1253 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1254 	struct mma9553_data *data = iio_priv(indio_dev);
1255 	int ret;
1256 
1257 	ret = mma9551_set_device_state(data->client, true);
1258 	if (ret < 0)
1259 		return ret;
1260 
1261 	mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
1262 
1263 	return 0;
1264 }
1265 #endif
1266 
1267 #ifdef CONFIG_PM_SLEEP
1268 static int mma9553_suspend(struct device *dev)
1269 {
1270 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1271 	struct mma9553_data *data = iio_priv(indio_dev);
1272 	int ret;
1273 
1274 	mutex_lock(&data->mutex);
1275 	ret = mma9551_set_device_state(data->client, false);
1276 	mutex_unlock(&data->mutex);
1277 
1278 	return ret;
1279 }
1280 
1281 static int mma9553_resume(struct device *dev)
1282 {
1283 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1284 	struct mma9553_data *data = iio_priv(indio_dev);
1285 	int ret;
1286 
1287 	mutex_lock(&data->mutex);
1288 	ret = mma9551_set_device_state(data->client, true);
1289 	mutex_unlock(&data->mutex);
1290 
1291 	return ret;
1292 }
1293 #endif
1294 
1295 static const struct dev_pm_ops mma9553_pm_ops = {
1296 	SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
1297 	SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
1298 			   mma9553_runtime_resume, NULL)
1299 };
1300 
1301 static const struct acpi_device_id mma9553_acpi_match[] = {
1302 	{"MMA9553", 0},
1303 	{},
1304 };
1305 
1306 MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
1307 
1308 static const struct i2c_device_id mma9553_id[] = {
1309 	{"mma9553", 0},
1310 	{},
1311 };
1312 
1313 MODULE_DEVICE_TABLE(i2c, mma9553_id);
1314 
1315 static struct i2c_driver mma9553_driver = {
1316 	.driver = {
1317 		   .name = MMA9553_DRV_NAME,
1318 		   .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
1319 		   .pm = &mma9553_pm_ops,
1320 		   },
1321 	.probe = mma9553_probe,
1322 	.remove = mma9553_remove,
1323 	.id_table = mma9553_id,
1324 };
1325 
1326 module_i2c_driver(mma9553_driver);
1327 
1328 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1329 MODULE_LICENSE("GPL v2");
1330 MODULE_DESCRIPTION("MMA9553L pedometer platform driver");
1331