xref: /openbmc/linux/drivers/iio/accel/mma9553.c (revision abfbd895)
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 
30 /* Pedometer configuration registers (R/W) */
31 #define MMA9553_REG_CONF_SLEEPMIN		0x00
32 #define MMA9553_REG_CONF_SLEEPMAX		0x02
33 #define MMA9553_REG_CONF_SLEEPTHD		0x04
34 #define MMA9553_MASK_CONF_WORD			GENMASK(15, 0)
35 
36 #define MMA9553_REG_CONF_CONF_STEPLEN		0x06
37 #define MMA9553_MASK_CONF_CONFIG		BIT(15)
38 #define MMA9553_MASK_CONF_ACT_DBCNTM		BIT(14)
39 #define MMA9553_MASK_CONF_SLP_DBCNTM		BIT(13)
40 #define MMA9553_MASK_CONF_STEPLEN		GENMASK(7, 0)
41 
42 #define MMA9553_REG_CONF_HEIGHT_WEIGHT		0x08
43 #define MMA9553_MASK_CONF_HEIGHT		GENMASK(15, 8)
44 #define MMA9553_MASK_CONF_WEIGHT		GENMASK(7, 0)
45 
46 #define MMA9553_REG_CONF_FILTER			0x0A
47 #define MMA9553_MASK_CONF_FILTSTEP		GENMASK(15, 8)
48 #define MMA9553_MASK_CONF_MALE			BIT(7)
49 #define MMA9553_MASK_CONF_FILTTIME		GENMASK(6, 0)
50 
51 #define MMA9553_REG_CONF_SPEED_STEP		0x0C
52 #define MMA9553_MASK_CONF_SPDPRD		GENMASK(15, 8)
53 #define MMA9553_MASK_CONF_STEPCOALESCE		GENMASK(7, 0)
54 
55 #define MMA9553_REG_CONF_ACTTHD			0x0E
56 #define MMA9553_MAX_ACTTHD			GENMASK(15, 0)
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		GENMASK(10, 8)
66 #define MMA9553_MASK_STATUS_VERSION		GENMASK(7, 0)
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 MMA9553_STATUS_TO_BITNUM(bit)	(ffs(bit) - 9)
80 #define MMA9553_MAX_BITNUM		MMA9553_STATUS_TO_BITNUM(BIT(16))
81 
82 #define MMA9553_DEFAULT_SAMPLE_RATE	30	/* Hz */
83 
84 /*
85  * The internal activity level must be stable for ACTTHD samples before
86  * ACTIVITY is updated. The ACTIVITY variable contains the current activity
87  * level and is updated every time a step is detected or once a second
88  * if there are no steps.
89  */
90 #define MMA9553_ACTIVITY_THD_TO_SEC(thd) ((thd) / MMA9553_DEFAULT_SAMPLE_RATE)
91 #define MMA9553_ACTIVITY_SEC_TO_THD(sec) ((sec) * MMA9553_DEFAULT_SAMPLE_RATE)
92 
93 /*
94  * Autonomously suspend pedometer if acceleration vector magnitude
95  * is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
96  */
97 #define MMA9553_DEFAULT_SLEEPMIN	3688	/* 0,9 g */
98 #define MMA9553_DEFAULT_SLEEPMAX	4508	/* 1,1 g */
99 #define MMA9553_DEFAULT_SLEEPTHD	(MMA9553_DEFAULT_SAMPLE_RATE * 30)
100 
101 #define MMA9553_CONFIG_RETRIES		2
102 
103 /* Status register - activity field  */
104 enum activity_level {
105 	ACTIVITY_UNKNOWN,
106 	ACTIVITY_REST,
107 	ACTIVITY_WALKING,
108 	ACTIVITY_JOGGING,
109 	ACTIVITY_RUNNING,
110 };
111 
112 static struct mma9553_event_info {
113 	enum iio_chan_type type;
114 	enum iio_modifier mod;
115 	enum iio_event_direction dir;
116 } mma9553_events_info[] = {
117 	{
118 		.type = IIO_STEPS,
119 		.mod = IIO_NO_MOD,
120 		.dir = IIO_EV_DIR_NONE,
121 	},
122 	{
123 		.type = IIO_ACTIVITY,
124 		.mod = IIO_MOD_STILL,
125 		.dir = IIO_EV_DIR_RISING,
126 	},
127 	{
128 		.type = IIO_ACTIVITY,
129 		.mod = IIO_MOD_STILL,
130 		.dir = IIO_EV_DIR_FALLING,
131 	},
132 	{
133 		.type = IIO_ACTIVITY,
134 		.mod = IIO_MOD_WALKING,
135 		.dir = IIO_EV_DIR_RISING,
136 	},
137 	{
138 		.type = IIO_ACTIVITY,
139 		.mod = IIO_MOD_WALKING,
140 		.dir = IIO_EV_DIR_FALLING,
141 	},
142 	{
143 		.type = IIO_ACTIVITY,
144 		.mod = IIO_MOD_JOGGING,
145 		.dir = IIO_EV_DIR_RISING,
146 	},
147 	{
148 		.type = IIO_ACTIVITY,
149 		.mod = IIO_MOD_JOGGING,
150 		.dir = IIO_EV_DIR_FALLING,
151 	},
152 	{
153 		.type = IIO_ACTIVITY,
154 		.mod = IIO_MOD_RUNNING,
155 		.dir = IIO_EV_DIR_RISING,
156 	},
157 	{
158 		.type = IIO_ACTIVITY,
159 		.mod = IIO_MOD_RUNNING,
160 		.dir = IIO_EV_DIR_FALLING,
161 	},
162 };
163 
164 #define MMA9553_EVENTS_INFO_SIZE ARRAY_SIZE(mma9553_events_info)
165 
166 struct mma9553_event {
167 	struct mma9553_event_info *info;
168 	bool enabled;
169 };
170 
171 struct mma9553_conf_regs {
172 	u16 sleepmin;
173 	u16 sleepmax;
174 	u16 sleepthd;
175 	u16 config;
176 	u16 height_weight;
177 	u16 filter;
178 	u16 speed_step;
179 	u16 actthd;
180 } __packed;
181 
182 struct mma9553_data {
183 	struct i2c_client *client;
184 	/*
185 	 * 1. Serialize access to HW (requested by mma9551_core API).
186 	 * 2. Serialize sequences that power on/off the device and access HW.
187 	 */
188 	struct mutex mutex;
189 	struct mma9553_conf_regs conf;
190 	struct mma9553_event events[MMA9553_EVENTS_INFO_SIZE];
191 	int num_events;
192 	u8 gpio_bitnum;
193 	/*
194 	 * This is used for all features that depend on step count:
195 	 * step count, distance, speed, calories.
196 	 */
197 	bool stepcnt_enabled;
198 	u16 stepcnt;
199 	u8 activity;
200 	s64 timestamp;
201 };
202 
203 static u8 mma9553_get_bits(u16 val, u16 mask)
204 {
205 	return (val & mask) >> (ffs(mask) - 1);
206 }
207 
208 static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
209 {
210 	return (current_val & ~mask) | (val << (ffs(mask) - 1));
211 }
212 
213 static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
214 {
215 	switch (activity) {
216 	case ACTIVITY_RUNNING:
217 		return IIO_MOD_RUNNING;
218 	case ACTIVITY_JOGGING:
219 		return IIO_MOD_JOGGING;
220 	case ACTIVITY_WALKING:
221 		return IIO_MOD_WALKING;
222 	case ACTIVITY_REST:
223 		return IIO_MOD_STILL;
224 	case ACTIVITY_UNKNOWN:
225 	default:
226 		return IIO_NO_MOD;
227 	}
228 }
229 
230 static void mma9553_init_events(struct mma9553_data *data)
231 {
232 	int i;
233 
234 	data->num_events = MMA9553_EVENTS_INFO_SIZE;
235 	for (i = 0; i < data->num_events; i++) {
236 		data->events[i].info = &mma9553_events_info[i];
237 		data->events[i].enabled = false;
238 	}
239 }
240 
241 static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
242 					       enum iio_chan_type type,
243 					       enum iio_modifier mod,
244 					       enum iio_event_direction dir)
245 {
246 	int i;
247 
248 	for (i = 0; i < data->num_events; i++)
249 		if (data->events[i].info->type == type &&
250 		    data->events[i].info->mod == mod &&
251 		    data->events[i].info->dir == dir)
252 			return &data->events[i];
253 
254 	return NULL;
255 }
256 
257 static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
258 					 bool check_type,
259 					 enum iio_chan_type type)
260 {
261 	int i;
262 
263 	for (i = 0; i < data->num_events; i++)
264 		if ((check_type && data->events[i].info->type == type &&
265 		     data->events[i].enabled) ||
266 		     (!check_type && data->events[i].enabled))
267 			return true;
268 
269 	return false;
270 }
271 
272 static int mma9553_set_config(struct mma9553_data *data, u16 reg,
273 			      u16 *p_reg_val, u16 val, u16 mask)
274 {
275 	int ret, retries;
276 	u16 reg_val, config;
277 
278 	reg_val = *p_reg_val;
279 	if (val == mma9553_get_bits(reg_val, mask))
280 		return 0;
281 
282 	reg_val = mma9553_set_bits(reg_val, val, mask);
283 	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
284 					reg, reg_val);
285 	if (ret < 0) {
286 		dev_err(&data->client->dev,
287 			"error writing config register 0x%x\n", reg);
288 		return ret;
289 	}
290 
291 	*p_reg_val = reg_val;
292 
293 	/* Reinitializes the pedometer with current configuration values */
294 	config = mma9553_set_bits(data->conf.config, 1,
295 				  MMA9553_MASK_CONF_CONFIG);
296 
297 	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
298 					MMA9553_REG_CONF_CONF_STEPLEN, config);
299 	if (ret < 0) {
300 		dev_err(&data->client->dev,
301 			"error writing config register 0x%x\n",
302 			MMA9553_REG_CONF_CONF_STEPLEN);
303 		return ret;
304 	}
305 
306 	retries = MMA9553_CONFIG_RETRIES;
307 	do {
308 		mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
309 		ret = mma9551_read_config_word(data->client,
310 					       MMA9551_APPID_PEDOMETER,
311 					       MMA9553_REG_CONF_CONF_STEPLEN,
312 					       &config);
313 		if (ret < 0)
314 			return ret;
315 	} while (mma9553_get_bits(config, MMA9553_MASK_CONF_CONFIG) &&
316 		 --retries > 0);
317 
318 	return 0;
319 }
320 
321 static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
322 					 u8 *activity, u16 *stepcnt)
323 {
324 	u16 buf[2];
325 	int ret;
326 
327 	ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
328 					MMA9553_REG_STATUS, ARRAY_SIZE(buf),
329 					buf);
330 	if (ret < 0) {
331 		dev_err(&data->client->dev,
332 			"error reading status and stepcnt\n");
333 		return ret;
334 	}
335 
336 	*activity = mma9553_get_bits(buf[0], MMA9553_MASK_STATUS_ACTIVITY);
337 	*stepcnt = buf[1];
338 
339 	return 0;
340 }
341 
342 static int mma9553_conf_gpio(struct mma9553_data *data)
343 {
344 	u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
345 	int ret;
346 	struct mma9553_event *ev_step_detect;
347 	bool activity_enabled;
348 
349 	activity_enabled = mma9553_is_any_event_enabled(data, true,
350 							IIO_ACTIVITY);
351 	ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
352 					   IIO_EV_DIR_NONE);
353 
354 	/*
355 	 * If both step detector and activity are enabled, use the MRGFL bit.
356 	 * This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
357 	 */
358 	if (activity_enabled && ev_step_detect->enabled)
359 		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_MRGFL);
360 	else if (ev_step_detect->enabled)
361 		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_STEPCHG);
362 	else if (activity_enabled)
363 		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_ACTCHG);
364 	else			/* Reset */
365 		appid = MMA9551_APPID_NONE;
366 
367 	if (data->gpio_bitnum == bitnum)
368 		return 0;
369 
370 	/* Save initial values for activity and stepcnt */
371 	if (activity_enabled || ev_step_detect->enabled) {
372 		ret = mma9553_read_activity_stepcnt(data, &data->activity,
373 						    &data->stepcnt);
374 		if (ret < 0)
375 			return ret;
376 	}
377 
378 	ret = mma9551_gpio_config(data->client, MMA9553_DEFAULT_GPIO_PIN, appid,
379 				  bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
380 	if (ret < 0)
381 		return ret;
382 	data->gpio_bitnum = bitnum;
383 
384 	return 0;
385 }
386 
387 static int mma9553_init(struct mma9553_data *data)
388 {
389 	int ret;
390 
391 	ret = mma9551_read_version(data->client);
392 	if (ret)
393 		return ret;
394 
395 	/*
396 	 * Read all the pedometer configuration registers. This is used as
397 	 * a device identification command to differentiate the MMA9553L
398 	 * from the MMA9550L.
399 	 */
400 	ret = mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
401 					MMA9553_REG_CONF_SLEEPMIN,
402 					sizeof(data->conf) / sizeof(u16),
403 					(u16 *)&data->conf);
404 	if (ret < 0) {
405 		dev_err(&data->client->dev,
406 			"failed to read configuration registers\n");
407 		return ret;
408 	}
409 
410 	/* Reset GPIO */
411 	data->gpio_bitnum = MMA9553_MAX_BITNUM;
412 	ret = mma9553_conf_gpio(data);
413 	if (ret < 0)
414 		return ret;
415 
416 	ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
417 	if (ret < 0)
418 		return ret;
419 
420 	/* Init config registers */
421 	data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
422 	data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
423 	data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
424 	data->conf.config = mma9553_set_bits(data->conf.config, 1,
425 					     MMA9553_MASK_CONF_CONFIG);
426 	/*
427 	 * Clear the activity debounce counter when the activity level changes,
428 	 * so that the confidence level applies for any activity level.
429 	 */
430 	data->conf.config = mma9553_set_bits(data->conf.config, 1,
431 					     MMA9553_MASK_CONF_ACT_DBCNTM);
432 	ret = mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
433 					 MMA9553_REG_CONF_SLEEPMIN,
434 					 sizeof(data->conf) / sizeof(u16),
435 					 (u16 *)&data->conf);
436 	if (ret < 0) {
437 		dev_err(&data->client->dev,
438 			"failed to write configuration registers\n");
439 		return ret;
440 	}
441 
442 	return mma9551_set_device_state(data->client, true);
443 }
444 
445 static int mma9553_read_status_word(struct mma9553_data *data, u16 reg,
446 				    u16 *tmp)
447 {
448 	bool powered_on;
449 	int ret;
450 
451 	/*
452 	 * The HW only counts steps and other dependent
453 	 * parameters (speed, distance, calories, activity)
454 	 * if power is on (from enabling an event or the
455 	 * step counter).
456 	 */
457 	powered_on = mma9553_is_any_event_enabled(data, false, 0) ||
458 		     data->stepcnt_enabled;
459 	if (!powered_on) {
460 		dev_err(&data->client->dev, "No channels enabled\n");
461 		return -EINVAL;
462 	}
463 
464 	mutex_lock(&data->mutex);
465 	ret = mma9551_read_status_word(data->client, MMA9551_APPID_PEDOMETER,
466 				       reg, tmp);
467 	mutex_unlock(&data->mutex);
468 	return ret;
469 }
470 
471 static int mma9553_read_raw(struct iio_dev *indio_dev,
472 			    struct iio_chan_spec const *chan,
473 			    int *val, int *val2, long mask)
474 {
475 	struct mma9553_data *data = iio_priv(indio_dev);
476 	int ret;
477 	u16 tmp;
478 	u8 activity;
479 
480 	switch (mask) {
481 	case IIO_CHAN_INFO_PROCESSED:
482 		switch (chan->type) {
483 		case IIO_STEPS:
484 			ret = mma9553_read_status_word(data,
485 						       MMA9553_REG_STEPCNT,
486 						       &tmp);
487 			if (ret < 0)
488 				return ret;
489 			*val = tmp;
490 			return IIO_VAL_INT;
491 		case IIO_DISTANCE:
492 			ret = mma9553_read_status_word(data,
493 						       MMA9553_REG_DISTANCE,
494 						       &tmp);
495 			if (ret < 0)
496 				return ret;
497 			*val = tmp;
498 			return IIO_VAL_INT;
499 		case IIO_ACTIVITY:
500 			ret = mma9553_read_status_word(data,
501 						       MMA9553_REG_STATUS,
502 						       &tmp);
503 			if (ret < 0)
504 				return ret;
505 
506 			activity =
507 			    mma9553_get_bits(tmp, MMA9553_MASK_STATUS_ACTIVITY);
508 
509 			/*
510 			 * The device does not support confidence value levels,
511 			 * so we will always have 100% for current activity and
512 			 * 0% for the others.
513 			 */
514 			if (chan->channel2 == mma9553_activity_to_mod(activity))
515 				*val = 100;
516 			else
517 				*val = 0;
518 			return IIO_VAL_INT;
519 		default:
520 			return -EINVAL;
521 		}
522 	case IIO_CHAN_INFO_RAW:
523 		switch (chan->type) {
524 		case IIO_VELOCITY:	/* m/h */
525 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
526 				return -EINVAL;
527 			ret = mma9553_read_status_word(data,
528 						       MMA9553_REG_SPEED,
529 						       &tmp);
530 			if (ret < 0)
531 				return ret;
532 			*val = tmp;
533 			return IIO_VAL_INT;
534 		case IIO_ENERGY:	/* Cal or kcal */
535 			ret = mma9553_read_status_word(data,
536 						       MMA9553_REG_CALORIES,
537 						       &tmp);
538 			if (ret < 0)
539 				return ret;
540 			*val = tmp;
541 			return IIO_VAL_INT;
542 		case IIO_ACCEL:
543 			mutex_lock(&data->mutex);
544 			ret = mma9551_read_accel_chan(data->client,
545 						      chan, val, val2);
546 			mutex_unlock(&data->mutex);
547 			return ret;
548 		default:
549 			return -EINVAL;
550 		}
551 	case IIO_CHAN_INFO_SCALE:
552 		switch (chan->type) {
553 		case IIO_VELOCITY:	/* m/h to m/s */
554 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
555 				return -EINVAL;
556 			*val = 0;
557 			*val2 = 277;	/* 0.000277 */
558 			return IIO_VAL_INT_PLUS_MICRO;
559 		case IIO_ENERGY:	/* Cal or kcal to J */
560 			*val = 4184;
561 			return IIO_VAL_INT;
562 		case IIO_ACCEL:
563 			return mma9551_read_accel_scale(val, val2);
564 		default:
565 			return -EINVAL;
566 		}
567 	case IIO_CHAN_INFO_ENABLE:
568 		*val = data->stepcnt_enabled;
569 		return IIO_VAL_INT;
570 	case IIO_CHAN_INFO_CALIBHEIGHT:
571 		tmp = mma9553_get_bits(data->conf.height_weight,
572 				       MMA9553_MASK_CONF_HEIGHT);
573 		*val = tmp / 100;	/* cm to m */
574 		*val2 = (tmp % 100) * 10000;
575 		return IIO_VAL_INT_PLUS_MICRO;
576 	case IIO_CHAN_INFO_CALIBWEIGHT:
577 		*val = mma9553_get_bits(data->conf.height_weight,
578 					MMA9553_MASK_CONF_WEIGHT);
579 		return IIO_VAL_INT;
580 	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
581 		switch (chan->type) {
582 		case IIO_STEPS:
583 			*val = mma9553_get_bits(data->conf.filter,
584 						MMA9553_MASK_CONF_FILTSTEP);
585 			return IIO_VAL_INT;
586 		default:
587 			return -EINVAL;
588 		}
589 	case IIO_CHAN_INFO_DEBOUNCE_TIME:
590 		switch (chan->type) {
591 		case IIO_STEPS:
592 			*val = mma9553_get_bits(data->conf.filter,
593 						MMA9553_MASK_CONF_FILTTIME);
594 			return IIO_VAL_INT;
595 		default:
596 			return -EINVAL;
597 		}
598 	case IIO_CHAN_INFO_INT_TIME:
599 		switch (chan->type) {
600 		case IIO_VELOCITY:
601 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
602 				return -EINVAL;
603 			*val = mma9553_get_bits(data->conf.speed_step,
604 						MMA9553_MASK_CONF_SPDPRD);
605 			return IIO_VAL_INT;
606 		default:
607 			return -EINVAL;
608 		}
609 	default:
610 		return -EINVAL;
611 	}
612 }
613 
614 static int mma9553_write_raw(struct iio_dev *indio_dev,
615 			     struct iio_chan_spec const *chan,
616 			     int val, int val2, long mask)
617 {
618 	struct mma9553_data *data = iio_priv(indio_dev);
619 	int ret, tmp;
620 
621 	switch (mask) {
622 	case IIO_CHAN_INFO_ENABLE:
623 		if (data->stepcnt_enabled == !!val)
624 			return 0;
625 		mutex_lock(&data->mutex);
626 		ret = mma9551_set_power_state(data->client, val);
627 		if (ret < 0) {
628 			mutex_unlock(&data->mutex);
629 			return ret;
630 		}
631 		data->stepcnt_enabled = val;
632 		mutex_unlock(&data->mutex);
633 		return 0;
634 	case IIO_CHAN_INFO_CALIBHEIGHT:
635 		/* m to cm */
636 		tmp = val * 100 + val2 / 10000;
637 		if (tmp < 0 || tmp > 255)
638 			return -EINVAL;
639 		mutex_lock(&data->mutex);
640 		ret = mma9553_set_config(data,
641 					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
642 					 &data->conf.height_weight,
643 					 tmp, MMA9553_MASK_CONF_HEIGHT);
644 		mutex_unlock(&data->mutex);
645 		return ret;
646 	case IIO_CHAN_INFO_CALIBWEIGHT:
647 		if (val < 0 || val > 255)
648 			return -EINVAL;
649 		mutex_lock(&data->mutex);
650 		ret = mma9553_set_config(data,
651 					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
652 					 &data->conf.height_weight,
653 					 val, MMA9553_MASK_CONF_WEIGHT);
654 		mutex_unlock(&data->mutex);
655 		return ret;
656 	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
657 		switch (chan->type) {
658 		case IIO_STEPS:
659 			/*
660 			 * Set to 0 to disable step filtering. If the value
661 			 * specified is greater than 6, then 6 will be used.
662 			 */
663 			if (val < 0)
664 				return -EINVAL;
665 			if (val > 6)
666 				val = 6;
667 			mutex_lock(&data->mutex);
668 			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
669 						 &data->conf.filter, val,
670 						 MMA9553_MASK_CONF_FILTSTEP);
671 			mutex_unlock(&data->mutex);
672 			return ret;
673 		default:
674 			return -EINVAL;
675 		}
676 	case IIO_CHAN_INFO_DEBOUNCE_TIME:
677 		switch (chan->type) {
678 		case IIO_STEPS:
679 			if (val < 0 || val > 127)
680 				return -EINVAL;
681 			mutex_lock(&data->mutex);
682 			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
683 						 &data->conf.filter, val,
684 						 MMA9553_MASK_CONF_FILTTIME);
685 			mutex_unlock(&data->mutex);
686 			return ret;
687 		default:
688 			return -EINVAL;
689 		}
690 	case IIO_CHAN_INFO_INT_TIME:
691 		switch (chan->type) {
692 		case IIO_VELOCITY:
693 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
694 				return -EINVAL;
695 			/*
696 			 * If set to a value greater than 5, then 5 will be
697 			 * used. Warning: Do not set SPDPRD to 0 or 1 as
698 			 * this may cause undesirable behavior.
699 			 */
700 			if (val < 2)
701 				return -EINVAL;
702 			if (val > 5)
703 				val = 5;
704 			mutex_lock(&data->mutex);
705 			ret = mma9553_set_config(data,
706 						 MMA9553_REG_CONF_SPEED_STEP,
707 						 &data->conf.speed_step, val,
708 						 MMA9553_MASK_CONF_SPDPRD);
709 			mutex_unlock(&data->mutex);
710 			return ret;
711 		default:
712 			return -EINVAL;
713 		}
714 	default:
715 		return -EINVAL;
716 	}
717 }
718 
719 static int mma9553_read_event_config(struct iio_dev *indio_dev,
720 				     const struct iio_chan_spec *chan,
721 				     enum iio_event_type type,
722 				     enum iio_event_direction dir)
723 {
724 	struct mma9553_data *data = iio_priv(indio_dev);
725 	struct mma9553_event *event;
726 
727 	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
728 	if (!event)
729 		return -EINVAL;
730 
731 	return event->enabled;
732 }
733 
734 static int mma9553_write_event_config(struct iio_dev *indio_dev,
735 				      const struct iio_chan_spec *chan,
736 				      enum iio_event_type type,
737 				      enum iio_event_direction dir, int state)
738 {
739 	struct mma9553_data *data = iio_priv(indio_dev);
740 	struct mma9553_event *event;
741 	int ret;
742 
743 	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
744 	if (!event)
745 		return -EINVAL;
746 
747 	if (event->enabled == state)
748 		return 0;
749 
750 	mutex_lock(&data->mutex);
751 
752 	ret = mma9551_set_power_state(data->client, state);
753 	if (ret < 0)
754 		goto err_out;
755 	event->enabled = state;
756 
757 	ret = mma9553_conf_gpio(data);
758 	if (ret < 0)
759 		goto err_conf_gpio;
760 
761 	mutex_unlock(&data->mutex);
762 
763 	return 0;
764 
765 err_conf_gpio:
766 	if (state) {
767 		event->enabled = false;
768 		mma9551_set_power_state(data->client, false);
769 	}
770 err_out:
771 	mutex_unlock(&data->mutex);
772 	return ret;
773 }
774 
775 static int mma9553_read_event_value(struct iio_dev *indio_dev,
776 				    const struct iio_chan_spec *chan,
777 				    enum iio_event_type type,
778 				    enum iio_event_direction dir,
779 				    enum iio_event_info info,
780 				    int *val, int *val2)
781 {
782 	struct mma9553_data *data = iio_priv(indio_dev);
783 
784 	*val2 = 0;
785 	switch (info) {
786 	case IIO_EV_INFO_VALUE:
787 		switch (chan->type) {
788 		case IIO_STEPS:
789 			*val = mma9553_get_bits(data->conf.speed_step,
790 						MMA9553_MASK_CONF_STEPCOALESCE);
791 			return IIO_VAL_INT;
792 		case IIO_ACTIVITY:
793 			/*
794 			 * The device does not support confidence value levels.
795 			 * We set an average of 50%.
796 			 */
797 			*val = 50;
798 			return IIO_VAL_INT;
799 		default:
800 			return -EINVAL;
801 		}
802 	case IIO_EV_INFO_PERIOD:
803 		switch (chan->type) {
804 		case IIO_ACTIVITY:
805 			*val = MMA9553_ACTIVITY_THD_TO_SEC(data->conf.actthd);
806 			return IIO_VAL_INT;
807 		default:
808 			return -EINVAL;
809 		}
810 	default:
811 		return -EINVAL;
812 	}
813 }
814 
815 static int mma9553_write_event_value(struct iio_dev *indio_dev,
816 				     const struct iio_chan_spec *chan,
817 				     enum iio_event_type type,
818 				     enum iio_event_direction dir,
819 				     enum iio_event_info info,
820 				     int val, int val2)
821 {
822 	struct mma9553_data *data = iio_priv(indio_dev);
823 	int ret;
824 
825 	switch (info) {
826 	case IIO_EV_INFO_VALUE:
827 		switch (chan->type) {
828 		case IIO_STEPS:
829 			if (val < 0 || val > 255)
830 				return -EINVAL;
831 			mutex_lock(&data->mutex);
832 			ret = mma9553_set_config(data,
833 						MMA9553_REG_CONF_SPEED_STEP,
834 						&data->conf.speed_step, val,
835 						MMA9553_MASK_CONF_STEPCOALESCE);
836 			mutex_unlock(&data->mutex);
837 			return ret;
838 		default:
839 			return -EINVAL;
840 		}
841 	case IIO_EV_INFO_PERIOD:
842 		switch (chan->type) {
843 		case IIO_ACTIVITY:
844 			if (val < 0 || val > MMA9553_ACTIVITY_THD_TO_SEC(
845 			    MMA9553_MAX_ACTTHD))
846 				return -EINVAL;
847 			mutex_lock(&data->mutex);
848 			ret = mma9553_set_config(data, MMA9553_REG_CONF_ACTTHD,
849 						 &data->conf.actthd,
850 						 MMA9553_ACTIVITY_SEC_TO_THD
851 						 (val), MMA9553_MASK_CONF_WORD);
852 			mutex_unlock(&data->mutex);
853 			return ret;
854 		default:
855 			return -EINVAL;
856 		}
857 	default:
858 		return -EINVAL;
859 	}
860 }
861 
862 static int mma9553_get_calibgender_mode(struct iio_dev *indio_dev,
863 					const struct iio_chan_spec *chan)
864 {
865 	struct mma9553_data *data = iio_priv(indio_dev);
866 	u8 gender;
867 
868 	gender = mma9553_get_bits(data->conf.filter, MMA9553_MASK_CONF_MALE);
869 	/*
870 	 * HW expects 0 for female and 1 for male,
871 	 * while iio index is 0 for male and 1 for female.
872 	 */
873 	return !gender;
874 }
875 
876 static int mma9553_set_calibgender_mode(struct iio_dev *indio_dev,
877 					const struct iio_chan_spec *chan,
878 					unsigned int mode)
879 {
880 	struct mma9553_data *data = iio_priv(indio_dev);
881 	u8 gender = !mode;
882 	int ret;
883 
884 	if ((mode != 0) && (mode != 1))
885 		return -EINVAL;
886 	mutex_lock(&data->mutex);
887 	ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
888 				 &data->conf.filter, gender,
889 				 MMA9553_MASK_CONF_MALE);
890 	mutex_unlock(&data->mutex);
891 
892 	return ret;
893 }
894 
895 static const struct iio_event_spec mma9553_step_event = {
896 	.type = IIO_EV_TYPE_CHANGE,
897 	.dir = IIO_EV_DIR_NONE,
898 	.mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
899 };
900 
901 static const struct iio_event_spec mma9553_activity_events[] = {
902 	{
903 		.type = IIO_EV_TYPE_THRESH,
904 		.dir = IIO_EV_DIR_RISING,
905 		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
906 				 BIT(IIO_EV_INFO_VALUE) |
907 				 BIT(IIO_EV_INFO_PERIOD),
908 	 },
909 	{
910 		.type = IIO_EV_TYPE_THRESH,
911 		.dir = IIO_EV_DIR_FALLING,
912 		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
913 				 BIT(IIO_EV_INFO_VALUE) |
914 				 BIT(IIO_EV_INFO_PERIOD),
915 	},
916 };
917 
918 static const char * const mma9553_calibgender_modes[] = { "male", "female" };
919 
920 static const struct iio_enum mma9553_calibgender_enum = {
921 	.items = mma9553_calibgender_modes,
922 	.num_items = ARRAY_SIZE(mma9553_calibgender_modes),
923 	.get = mma9553_get_calibgender_mode,
924 	.set = mma9553_set_calibgender_mode,
925 };
926 
927 static const struct iio_chan_spec_ext_info mma9553_ext_info[] = {
928 	IIO_ENUM("calibgender", IIO_SHARED_BY_TYPE, &mma9553_calibgender_enum),
929 	IIO_ENUM_AVAILABLE("calibgender", &mma9553_calibgender_enum),
930 	{},
931 };
932 
933 #define MMA9553_PEDOMETER_CHANNEL(_type, _mask) {		\
934 	.type = _type,						\
935 	.info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE)      |	\
936 			      BIT(IIO_CHAN_INFO_CALIBHEIGHT) |	\
937 			      _mask,				\
938 	.ext_info = mma9553_ext_info,				\
939 }
940 
941 #define MMA9553_ACTIVITY_CHANNEL(_chan2) {				\
942 	.type = IIO_ACTIVITY,						\
943 	.modified = 1,							\
944 	.channel2 = _chan2,						\
945 	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),		\
946 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT) |	\
947 				    BIT(IIO_CHAN_INFO_ENABLE),		\
948 	.event_spec = mma9553_activity_events,				\
949 	.num_event_specs = ARRAY_SIZE(mma9553_activity_events),		\
950 	.ext_info = mma9553_ext_info,					\
951 }
952 
953 static const struct iio_chan_spec mma9553_channels[] = {
954 	MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
955 	MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
956 	MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
957 
958 	{
959 		.type = IIO_STEPS,
960 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
961 				     BIT(IIO_CHAN_INFO_ENABLE) |
962 				     BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
963 				     BIT(IIO_CHAN_INFO_DEBOUNCE_TIME),
964 		.event_spec = &mma9553_step_event,
965 		.num_event_specs = 1,
966 	},
967 
968 	MMA9553_PEDOMETER_CHANNEL(IIO_DISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
969 	{
970 		.type = IIO_VELOCITY,
971 		.modified = 1,
972 		.channel2 = IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
973 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
974 				      BIT(IIO_CHAN_INFO_SCALE) |
975 				      BIT(IIO_CHAN_INFO_INT_TIME) |
976 				      BIT(IIO_CHAN_INFO_ENABLE),
977 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT),
978 		.ext_info = mma9553_ext_info,
979 	},
980 	MMA9553_PEDOMETER_CHANNEL(IIO_ENERGY, BIT(IIO_CHAN_INFO_RAW) |
981 				  BIT(IIO_CHAN_INFO_SCALE) |
982 				  BIT(IIO_CHAN_INFO_CALIBWEIGHT)),
983 
984 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
985 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_JOGGING),
986 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
987 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_STILL),
988 };
989 
990 static const struct iio_info mma9553_info = {
991 	.driver_module = THIS_MODULE,
992 	.read_raw = mma9553_read_raw,
993 	.write_raw = mma9553_write_raw,
994 	.read_event_config = mma9553_read_event_config,
995 	.write_event_config = mma9553_write_event_config,
996 	.read_event_value = mma9553_read_event_value,
997 	.write_event_value = mma9553_write_event_value,
998 };
999 
1000 static irqreturn_t mma9553_irq_handler(int irq, void *private)
1001 {
1002 	struct iio_dev *indio_dev = private;
1003 	struct mma9553_data *data = iio_priv(indio_dev);
1004 
1005 	data->timestamp = iio_get_time_ns();
1006 	/*
1007 	 * Since we only configure the interrupt pin when an
1008 	 * event is enabled, we are sure we have at least
1009 	 * one event enabled at this point.
1010 	 */
1011 	return IRQ_WAKE_THREAD;
1012 }
1013 
1014 static irqreturn_t mma9553_event_handler(int irq, void *private)
1015 {
1016 	struct iio_dev *indio_dev = private;
1017 	struct mma9553_data *data = iio_priv(indio_dev);
1018 	u16 stepcnt;
1019 	u8 activity;
1020 	struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
1021 	int ret;
1022 
1023 	mutex_lock(&data->mutex);
1024 	ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
1025 	if (ret < 0) {
1026 		mutex_unlock(&data->mutex);
1027 		return IRQ_HANDLED;
1028 	}
1029 
1030 	ev_prev_activity = mma9553_get_event(data, IIO_ACTIVITY,
1031 					     mma9553_activity_to_mod(
1032 					     data->activity),
1033 					     IIO_EV_DIR_FALLING);
1034 	ev_activity = mma9553_get_event(data, IIO_ACTIVITY,
1035 					mma9553_activity_to_mod(activity),
1036 					IIO_EV_DIR_RISING);
1037 	ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
1038 					   IIO_EV_DIR_NONE);
1039 
1040 	if (ev_step_detect->enabled && (stepcnt != data->stepcnt)) {
1041 		data->stepcnt = stepcnt;
1042 		iio_push_event(indio_dev,
1043 			       IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
1044 					      IIO_EV_DIR_NONE,
1045 					      IIO_EV_TYPE_CHANGE, 0, 0, 0),
1046 			       data->timestamp);
1047 	}
1048 
1049 	if (activity != data->activity) {
1050 		data->activity = activity;
1051 		/* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
1052 		if (ev_prev_activity && ev_prev_activity->enabled)
1053 			iio_push_event(indio_dev,
1054 				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1055 						    ev_prev_activity->info->mod,
1056 						    IIO_EV_DIR_FALLING,
1057 						    IIO_EV_TYPE_THRESH, 0, 0,
1058 						    0),
1059 				       data->timestamp);
1060 
1061 		if (ev_activity && ev_activity->enabled)
1062 			iio_push_event(indio_dev,
1063 				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1064 						      ev_activity->info->mod,
1065 						      IIO_EV_DIR_RISING,
1066 						      IIO_EV_TYPE_THRESH, 0, 0,
1067 						      0),
1068 				       data->timestamp);
1069 	}
1070 	mutex_unlock(&data->mutex);
1071 
1072 	return IRQ_HANDLED;
1073 }
1074 
1075 static const char *mma9553_match_acpi_device(struct device *dev)
1076 {
1077 	const struct acpi_device_id *id;
1078 
1079 	id = acpi_match_device(dev->driver->acpi_match_table, dev);
1080 	if (!id)
1081 		return NULL;
1082 
1083 	return dev_name(dev);
1084 }
1085 
1086 static int mma9553_probe(struct i2c_client *client,
1087 			 const struct i2c_device_id *id)
1088 {
1089 	struct mma9553_data *data;
1090 	struct iio_dev *indio_dev;
1091 	const char *name = NULL;
1092 	int ret;
1093 
1094 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1095 	if (!indio_dev)
1096 		return -ENOMEM;
1097 
1098 	data = iio_priv(indio_dev);
1099 	i2c_set_clientdata(client, indio_dev);
1100 	data->client = client;
1101 
1102 	if (id)
1103 		name = id->name;
1104 	else if (ACPI_HANDLE(&client->dev))
1105 		name = mma9553_match_acpi_device(&client->dev);
1106 	else
1107 		return -ENOSYS;
1108 
1109 	mutex_init(&data->mutex);
1110 	mma9553_init_events(data);
1111 
1112 	ret = mma9553_init(data);
1113 	if (ret < 0)
1114 		return ret;
1115 
1116 	indio_dev->dev.parent = &client->dev;
1117 	indio_dev->channels = mma9553_channels;
1118 	indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
1119 	indio_dev->name = name;
1120 	indio_dev->modes = INDIO_DIRECT_MODE;
1121 	indio_dev->info = &mma9553_info;
1122 
1123 	if (client->irq > 0) {
1124 		ret = devm_request_threaded_irq(&client->dev, client->irq,
1125 						mma9553_irq_handler,
1126 						mma9553_event_handler,
1127 						IRQF_TRIGGER_RISING,
1128 						MMA9553_IRQ_NAME, indio_dev);
1129 		if (ret < 0) {
1130 			dev_err(&client->dev, "request irq %d failed\n",
1131 				client->irq);
1132 			goto out_poweroff;
1133 		}
1134 	}
1135 
1136 	ret = iio_device_register(indio_dev);
1137 	if (ret < 0) {
1138 		dev_err(&client->dev, "unable to register iio device\n");
1139 		goto out_poweroff;
1140 	}
1141 
1142 	ret = pm_runtime_set_active(&client->dev);
1143 	if (ret < 0)
1144 		goto out_iio_unregister;
1145 
1146 	pm_runtime_enable(&client->dev);
1147 	pm_runtime_set_autosuspend_delay(&client->dev,
1148 					 MMA9551_AUTO_SUSPEND_DELAY_MS);
1149 	pm_runtime_use_autosuspend(&client->dev);
1150 
1151 	dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
1152 
1153 	return 0;
1154 
1155 out_iio_unregister:
1156 	iio_device_unregister(indio_dev);
1157 out_poweroff:
1158 	mma9551_set_device_state(client, false);
1159 	return ret;
1160 }
1161 
1162 static int mma9553_remove(struct i2c_client *client)
1163 {
1164 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
1165 	struct mma9553_data *data = iio_priv(indio_dev);
1166 
1167 	pm_runtime_disable(&client->dev);
1168 	pm_runtime_set_suspended(&client->dev);
1169 	pm_runtime_put_noidle(&client->dev);
1170 
1171 	iio_device_unregister(indio_dev);
1172 	mutex_lock(&data->mutex);
1173 	mma9551_set_device_state(data->client, false);
1174 	mutex_unlock(&data->mutex);
1175 
1176 	return 0;
1177 }
1178 
1179 #ifdef CONFIG_PM
1180 static int mma9553_runtime_suspend(struct device *dev)
1181 {
1182 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1183 	struct mma9553_data *data = iio_priv(indio_dev);
1184 	int ret;
1185 
1186 	mutex_lock(&data->mutex);
1187 	ret = mma9551_set_device_state(data->client, false);
1188 	mutex_unlock(&data->mutex);
1189 	if (ret < 0) {
1190 		dev_err(&data->client->dev, "powering off device failed\n");
1191 		return -EAGAIN;
1192 	}
1193 
1194 	return 0;
1195 }
1196 
1197 static int mma9553_runtime_resume(struct device *dev)
1198 {
1199 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1200 	struct mma9553_data *data = iio_priv(indio_dev);
1201 	int ret;
1202 
1203 	ret = mma9551_set_device_state(data->client, true);
1204 	if (ret < 0)
1205 		return ret;
1206 
1207 	mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
1208 
1209 	return 0;
1210 }
1211 #endif
1212 
1213 #ifdef CONFIG_PM_SLEEP
1214 static int mma9553_suspend(struct device *dev)
1215 {
1216 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1217 	struct mma9553_data *data = iio_priv(indio_dev);
1218 	int ret;
1219 
1220 	mutex_lock(&data->mutex);
1221 	ret = mma9551_set_device_state(data->client, false);
1222 	mutex_unlock(&data->mutex);
1223 
1224 	return ret;
1225 }
1226 
1227 static int mma9553_resume(struct device *dev)
1228 {
1229 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1230 	struct mma9553_data *data = iio_priv(indio_dev);
1231 	int ret;
1232 
1233 	mutex_lock(&data->mutex);
1234 	ret = mma9551_set_device_state(data->client, true);
1235 	mutex_unlock(&data->mutex);
1236 
1237 	return ret;
1238 }
1239 #endif
1240 
1241 static const struct dev_pm_ops mma9553_pm_ops = {
1242 	SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
1243 	SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
1244 			   mma9553_runtime_resume, NULL)
1245 };
1246 
1247 static const struct acpi_device_id mma9553_acpi_match[] = {
1248 	{"MMA9553", 0},
1249 	{},
1250 };
1251 
1252 MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
1253 
1254 static const struct i2c_device_id mma9553_id[] = {
1255 	{"mma9553", 0},
1256 	{},
1257 };
1258 
1259 MODULE_DEVICE_TABLE(i2c, mma9553_id);
1260 
1261 static struct i2c_driver mma9553_driver = {
1262 	.driver = {
1263 		   .name = MMA9553_DRV_NAME,
1264 		   .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
1265 		   .pm = &mma9553_pm_ops,
1266 		   },
1267 	.probe = mma9553_probe,
1268 	.remove = mma9553_remove,
1269 	.id_table = mma9553_id,
1270 };
1271 
1272 module_i2c_driver(mma9553_driver);
1273 
1274 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1275 MODULE_LICENSE("GPL v2");
1276 MODULE_DESCRIPTION("MMA9553L pedometer platform driver");
1277