1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Freescale MMA9553L Intelligent Pedometer driver
4  * Copyright (c) 2014, Intel Corporation.
5  */
6 
7 #include <linux/module.h>
8 #include <linux/i2c.h>
9 #include <linux/interrupt.h>
10 #include <linux/slab.h>
11 #include <linux/acpi.h>
12 #include <linux/iio/iio.h>
13 #include <linux/iio/sysfs.h>
14 #include <linux/iio/events.h>
15 #include <linux/pm_runtime.h>
16 #include "mma9551_core.h"
17 
18 #define MMA9553_DRV_NAME			"mma9553"
19 #define MMA9553_IRQ_NAME			"mma9553_event"
20 
21 /* Pedometer configuration registers (R/W) */
22 #define MMA9553_REG_CONF_SLEEPMIN		0x00
23 #define MMA9553_REG_CONF_SLEEPMAX		0x02
24 #define MMA9553_REG_CONF_SLEEPTHD		0x04
25 #define MMA9553_MASK_CONF_WORD			GENMASK(15, 0)
26 
27 #define MMA9553_REG_CONF_CONF_STEPLEN		0x06
28 #define MMA9553_MASK_CONF_CONFIG		BIT(15)
29 #define MMA9553_MASK_CONF_ACT_DBCNTM		BIT(14)
30 #define MMA9553_MASK_CONF_SLP_DBCNTM		BIT(13)
31 #define MMA9553_MASK_CONF_STEPLEN		GENMASK(7, 0)
32 
33 #define MMA9553_REG_CONF_HEIGHT_WEIGHT		0x08
34 #define MMA9553_MASK_CONF_HEIGHT		GENMASK(15, 8)
35 #define MMA9553_MASK_CONF_WEIGHT		GENMASK(7, 0)
36 
37 #define MMA9553_REG_CONF_FILTER			0x0A
38 #define MMA9553_MASK_CONF_FILTSTEP		GENMASK(15, 8)
39 #define MMA9553_MASK_CONF_MALE			BIT(7)
40 #define MMA9553_MASK_CONF_FILTTIME		GENMASK(6, 0)
41 
42 #define MMA9553_REG_CONF_SPEED_STEP		0x0C
43 #define MMA9553_MASK_CONF_SPDPRD		GENMASK(15, 8)
44 #define MMA9553_MASK_CONF_STEPCOALESCE		GENMASK(7, 0)
45 
46 #define MMA9553_REG_CONF_ACTTHD			0x0E
47 #define MMA9553_MAX_ACTTHD			GENMASK(15, 0)
48 
49 /* Pedometer status registers (R-only) */
50 #define MMA9553_REG_STATUS			0x00
51 #define MMA9553_MASK_STATUS_MRGFL		BIT(15)
52 #define MMA9553_MASK_STATUS_SUSPCHG		BIT(14)
53 #define MMA9553_MASK_STATUS_STEPCHG		BIT(13)
54 #define MMA9553_MASK_STATUS_ACTCHG		BIT(12)
55 #define MMA9553_MASK_STATUS_SUSP		BIT(11)
56 #define MMA9553_MASK_STATUS_ACTIVITY		GENMASK(10, 8)
57 #define MMA9553_MASK_STATUS_VERSION		GENMASK(7, 0)
58 
59 #define MMA9553_REG_STEPCNT			0x02
60 #define MMA9553_REG_DISTANCE			0x04
61 #define MMA9553_REG_SPEED			0x06
62 #define MMA9553_REG_CALORIES			0x08
63 #define MMA9553_REG_SLEEPCNT			0x0A
64 
65 /* Pedometer events are always mapped to this pin. */
66 #define MMA9553_DEFAULT_GPIO_PIN	mma9551_gpio6
67 #define MMA9553_DEFAULT_GPIO_POLARITY	0
68 
69 /* Bitnum used for GPIO configuration = bit number in high status byte */
70 #define MMA9553_STATUS_TO_BITNUM(bit)	(ffs(bit) - 9)
71 #define MMA9553_MAX_BITNUM		MMA9553_STATUS_TO_BITNUM(BIT(16))
72 
73 #define MMA9553_DEFAULT_SAMPLE_RATE	30	/* Hz */
74 
75 /*
76  * The internal activity level must be stable for ACTTHD samples before
77  * ACTIVITY is updated. The ACTIVITY variable contains the current activity
78  * level and is updated every time a step is detected or once a second
79  * if there are no steps.
80  */
81 #define MMA9553_ACTIVITY_THD_TO_SEC(thd) ((thd) / MMA9553_DEFAULT_SAMPLE_RATE)
82 #define MMA9553_ACTIVITY_SEC_TO_THD(sec) ((sec) * MMA9553_DEFAULT_SAMPLE_RATE)
83 
84 /*
85  * Autonomously suspend pedometer if acceleration vector magnitude
86  * is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
87  */
88 #define MMA9553_DEFAULT_SLEEPMIN	3688	/* 0,9 g */
89 #define MMA9553_DEFAULT_SLEEPMAX	4508	/* 1,1 g */
90 #define MMA9553_DEFAULT_SLEEPTHD	(MMA9553_DEFAULT_SAMPLE_RATE * 30)
91 
92 #define MMA9553_CONFIG_RETRIES		2
93 
94 /* Status register - activity field  */
95 enum activity_level {
96 	ACTIVITY_UNKNOWN,
97 	ACTIVITY_REST,
98 	ACTIVITY_WALKING,
99 	ACTIVITY_JOGGING,
100 	ACTIVITY_RUNNING,
101 };
102 
103 static struct mma9553_event_info {
104 	enum iio_chan_type type;
105 	enum iio_modifier mod;
106 	enum iio_event_direction dir;
107 } mma9553_events_info[] = {
108 	{
109 		.type = IIO_STEPS,
110 		.mod = IIO_NO_MOD,
111 		.dir = IIO_EV_DIR_NONE,
112 	},
113 	{
114 		.type = IIO_ACTIVITY,
115 		.mod = IIO_MOD_STILL,
116 		.dir = IIO_EV_DIR_RISING,
117 	},
118 	{
119 		.type = IIO_ACTIVITY,
120 		.mod = IIO_MOD_STILL,
121 		.dir = IIO_EV_DIR_FALLING,
122 	},
123 	{
124 		.type = IIO_ACTIVITY,
125 		.mod = IIO_MOD_WALKING,
126 		.dir = IIO_EV_DIR_RISING,
127 	},
128 	{
129 		.type = IIO_ACTIVITY,
130 		.mod = IIO_MOD_WALKING,
131 		.dir = IIO_EV_DIR_FALLING,
132 	},
133 	{
134 		.type = IIO_ACTIVITY,
135 		.mod = IIO_MOD_JOGGING,
136 		.dir = IIO_EV_DIR_RISING,
137 	},
138 	{
139 		.type = IIO_ACTIVITY,
140 		.mod = IIO_MOD_JOGGING,
141 		.dir = IIO_EV_DIR_FALLING,
142 	},
143 	{
144 		.type = IIO_ACTIVITY,
145 		.mod = IIO_MOD_RUNNING,
146 		.dir = IIO_EV_DIR_RISING,
147 	},
148 	{
149 		.type = IIO_ACTIVITY,
150 		.mod = IIO_MOD_RUNNING,
151 		.dir = IIO_EV_DIR_FALLING,
152 	},
153 };
154 
155 #define MMA9553_EVENTS_INFO_SIZE ARRAY_SIZE(mma9553_events_info)
156 
157 struct mma9553_event {
158 	struct mma9553_event_info *info;
159 	bool enabled;
160 };
161 
162 struct mma9553_conf_regs {
163 	u16 sleepmin;
164 	u16 sleepmax;
165 	u16 sleepthd;
166 	u16 config;
167 	u16 height_weight;
168 	u16 filter;
169 	u16 speed_step;
170 	u16 actthd;
171 } __packed;
172 
173 struct mma9553_data {
174 	struct i2c_client *client;
175 	/*
176 	 * 1. Serialize access to HW (requested by mma9551_core API).
177 	 * 2. Serialize sequences that power on/off the device and access HW.
178 	 */
179 	struct mutex mutex;
180 	struct mma9553_conf_regs conf;
181 	struct mma9553_event events[MMA9553_EVENTS_INFO_SIZE];
182 	int num_events;
183 	u8 gpio_bitnum;
184 	/*
185 	 * This is used for all features that depend on step count:
186 	 * step count, distance, speed, calories.
187 	 */
188 	bool stepcnt_enabled;
189 	u16 stepcnt;
190 	u8 activity;
191 	s64 timestamp;
192 };
193 
mma9553_get_bits(u16 val,u16 mask)194 static u8 mma9553_get_bits(u16 val, u16 mask)
195 {
196 	return (val & mask) >> (ffs(mask) - 1);
197 }
198 
mma9553_set_bits(u16 current_val,u16 val,u16 mask)199 static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
200 {
201 	return (current_val & ~mask) | (val << (ffs(mask) - 1));
202 }
203 
mma9553_activity_to_mod(enum activity_level activity)204 static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
205 {
206 	switch (activity) {
207 	case ACTIVITY_RUNNING:
208 		return IIO_MOD_RUNNING;
209 	case ACTIVITY_JOGGING:
210 		return IIO_MOD_JOGGING;
211 	case ACTIVITY_WALKING:
212 		return IIO_MOD_WALKING;
213 	case ACTIVITY_REST:
214 		return IIO_MOD_STILL;
215 	case ACTIVITY_UNKNOWN:
216 	default:
217 		return IIO_NO_MOD;
218 	}
219 }
220 
mma9553_init_events(struct mma9553_data * data)221 static void mma9553_init_events(struct mma9553_data *data)
222 {
223 	int i;
224 
225 	data->num_events = MMA9553_EVENTS_INFO_SIZE;
226 	for (i = 0; i < data->num_events; i++) {
227 		data->events[i].info = &mma9553_events_info[i];
228 		data->events[i].enabled = false;
229 	}
230 }
231 
mma9553_get_event(struct mma9553_data * data,enum iio_chan_type type,enum iio_modifier mod,enum iio_event_direction dir)232 static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
233 					       enum iio_chan_type type,
234 					       enum iio_modifier mod,
235 					       enum iio_event_direction dir)
236 {
237 	int i;
238 
239 	for (i = 0; i < data->num_events; i++)
240 		if (data->events[i].info->type == type &&
241 		    data->events[i].info->mod == mod &&
242 		    data->events[i].info->dir == dir)
243 			return &data->events[i];
244 
245 	return NULL;
246 }
247 
mma9553_is_any_event_enabled(struct mma9553_data * data,bool check_type,enum iio_chan_type type)248 static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
249 					 bool check_type,
250 					 enum iio_chan_type type)
251 {
252 	int i;
253 
254 	for (i = 0; i < data->num_events; i++)
255 		if ((check_type && data->events[i].info->type == type &&
256 		     data->events[i].enabled) ||
257 		     (!check_type && data->events[i].enabled))
258 			return true;
259 
260 	return false;
261 }
262 
mma9553_set_config(struct mma9553_data * data,u16 reg,u16 * p_reg_val,u16 val,u16 mask)263 static int mma9553_set_config(struct mma9553_data *data, u16 reg,
264 			      u16 *p_reg_val, u16 val, u16 mask)
265 {
266 	int ret, retries;
267 	u16 reg_val, config;
268 
269 	reg_val = *p_reg_val;
270 	if (val == mma9553_get_bits(reg_val, mask))
271 		return 0;
272 
273 	reg_val = mma9553_set_bits(reg_val, val, mask);
274 	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
275 					reg, reg_val);
276 	if (ret < 0) {
277 		dev_err(&data->client->dev,
278 			"error writing config register 0x%x\n", reg);
279 		return ret;
280 	}
281 
282 	*p_reg_val = reg_val;
283 
284 	/* Reinitializes the pedometer with current configuration values */
285 	config = mma9553_set_bits(data->conf.config, 1,
286 				  MMA9553_MASK_CONF_CONFIG);
287 
288 	ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
289 					MMA9553_REG_CONF_CONF_STEPLEN, config);
290 	if (ret < 0) {
291 		dev_err(&data->client->dev,
292 			"error writing config register 0x%x\n",
293 			MMA9553_REG_CONF_CONF_STEPLEN);
294 		return ret;
295 	}
296 
297 	retries = MMA9553_CONFIG_RETRIES;
298 	do {
299 		mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
300 		ret = mma9551_read_config_word(data->client,
301 					       MMA9551_APPID_PEDOMETER,
302 					       MMA9553_REG_CONF_CONF_STEPLEN,
303 					       &config);
304 		if (ret < 0)
305 			return ret;
306 	} while (mma9553_get_bits(config, MMA9553_MASK_CONF_CONFIG) &&
307 		 --retries > 0);
308 
309 	return 0;
310 }
311 
mma9553_read_activity_stepcnt(struct mma9553_data * data,u8 * activity,u16 * stepcnt)312 static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
313 					 u8 *activity, u16 *stepcnt)
314 {
315 	u16 buf[2];
316 	int ret;
317 
318 	ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
319 					MMA9553_REG_STATUS, ARRAY_SIZE(buf),
320 					buf);
321 	if (ret < 0) {
322 		dev_err(&data->client->dev,
323 			"error reading status and stepcnt\n");
324 		return ret;
325 	}
326 
327 	*activity = mma9553_get_bits(buf[0], MMA9553_MASK_STATUS_ACTIVITY);
328 	*stepcnt = buf[1];
329 
330 	return 0;
331 }
332 
mma9553_conf_gpio(struct mma9553_data * data)333 static int mma9553_conf_gpio(struct mma9553_data *data)
334 {
335 	u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
336 	int ret;
337 	struct mma9553_event *ev_step_detect;
338 	bool activity_enabled;
339 
340 	activity_enabled = mma9553_is_any_event_enabled(data, true,
341 							IIO_ACTIVITY);
342 	ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
343 					   IIO_EV_DIR_NONE);
344 
345 	/*
346 	 * If both step detector and activity are enabled, use the MRGFL bit.
347 	 * This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
348 	 */
349 	if (activity_enabled && ev_step_detect->enabled)
350 		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_MRGFL);
351 	else if (ev_step_detect->enabled)
352 		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_STEPCHG);
353 	else if (activity_enabled)
354 		bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_ACTCHG);
355 	else			/* Reset */
356 		appid = MMA9551_APPID_NONE;
357 
358 	if (data->gpio_bitnum == bitnum)
359 		return 0;
360 
361 	/* Save initial values for activity and stepcnt */
362 	if (activity_enabled || ev_step_detect->enabled) {
363 		ret = mma9553_read_activity_stepcnt(data, &data->activity,
364 						    &data->stepcnt);
365 		if (ret < 0)
366 			return ret;
367 	}
368 
369 	ret = mma9551_gpio_config(data->client, MMA9553_DEFAULT_GPIO_PIN, appid,
370 				  bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
371 	if (ret < 0)
372 		return ret;
373 	data->gpio_bitnum = bitnum;
374 
375 	return 0;
376 }
377 
mma9553_init(struct mma9553_data * data)378 static int mma9553_init(struct mma9553_data *data)
379 {
380 	int ret;
381 
382 	ret = mma9551_read_version(data->client);
383 	if (ret)
384 		return ret;
385 
386 	/*
387 	 * Read all the pedometer configuration registers. This is used as
388 	 * a device identification command to differentiate the MMA9553L
389 	 * from the MMA9550L.
390 	 */
391 	ret = mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
392 					MMA9553_REG_CONF_SLEEPMIN,
393 					sizeof(data->conf) / sizeof(u16),
394 					(u16 *)&data->conf);
395 	if (ret < 0) {
396 		dev_err(&data->client->dev,
397 			"failed to read configuration registers\n");
398 		return ret;
399 	}
400 
401 	/* Reset GPIO */
402 	data->gpio_bitnum = MMA9553_MAX_BITNUM;
403 	ret = mma9553_conf_gpio(data);
404 	if (ret < 0)
405 		return ret;
406 
407 	ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
408 	if (ret < 0)
409 		return ret;
410 
411 	/* Init config registers */
412 	data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
413 	data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
414 	data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
415 	data->conf.config = mma9553_set_bits(data->conf.config, 1,
416 					     MMA9553_MASK_CONF_CONFIG);
417 	/*
418 	 * Clear the activity debounce counter when the activity level changes,
419 	 * so that the confidence level applies for any activity level.
420 	 */
421 	data->conf.config = mma9553_set_bits(data->conf.config, 1,
422 					     MMA9553_MASK_CONF_ACT_DBCNTM);
423 	ret = mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
424 					 MMA9553_REG_CONF_SLEEPMIN,
425 					 sizeof(data->conf) / sizeof(u16),
426 					 (u16 *)&data->conf);
427 	if (ret < 0) {
428 		dev_err(&data->client->dev,
429 			"failed to write configuration registers\n");
430 		return ret;
431 	}
432 
433 	return mma9551_set_device_state(data->client, true);
434 }
435 
mma9553_read_status_word(struct mma9553_data * data,u16 reg,u16 * tmp)436 static int mma9553_read_status_word(struct mma9553_data *data, u16 reg,
437 				    u16 *tmp)
438 {
439 	bool powered_on;
440 	int ret;
441 
442 	/*
443 	 * The HW only counts steps and other dependent
444 	 * parameters (speed, distance, calories, activity)
445 	 * if power is on (from enabling an event or the
446 	 * step counter).
447 	 */
448 	powered_on = mma9553_is_any_event_enabled(data, false, 0) ||
449 		     data->stepcnt_enabled;
450 	if (!powered_on) {
451 		dev_err(&data->client->dev, "No channels enabled\n");
452 		return -EINVAL;
453 	}
454 
455 	mutex_lock(&data->mutex);
456 	ret = mma9551_read_status_word(data->client, MMA9551_APPID_PEDOMETER,
457 				       reg, tmp);
458 	mutex_unlock(&data->mutex);
459 	return ret;
460 }
461 
mma9553_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)462 static int mma9553_read_raw(struct iio_dev *indio_dev,
463 			    struct iio_chan_spec const *chan,
464 			    int *val, int *val2, long mask)
465 {
466 	struct mma9553_data *data = iio_priv(indio_dev);
467 	int ret;
468 	u16 tmp;
469 	u8 activity;
470 
471 	switch (mask) {
472 	case IIO_CHAN_INFO_PROCESSED:
473 		switch (chan->type) {
474 		case IIO_STEPS:
475 			ret = mma9553_read_status_word(data,
476 						       MMA9553_REG_STEPCNT,
477 						       &tmp);
478 			if (ret < 0)
479 				return ret;
480 			*val = tmp;
481 			return IIO_VAL_INT;
482 		case IIO_DISTANCE:
483 			ret = mma9553_read_status_word(data,
484 						       MMA9553_REG_DISTANCE,
485 						       &tmp);
486 			if (ret < 0)
487 				return ret;
488 			*val = tmp;
489 			return IIO_VAL_INT;
490 		case IIO_ACTIVITY:
491 			ret = mma9553_read_status_word(data,
492 						       MMA9553_REG_STATUS,
493 						       &tmp);
494 			if (ret < 0)
495 				return ret;
496 
497 			activity =
498 			    mma9553_get_bits(tmp, MMA9553_MASK_STATUS_ACTIVITY);
499 
500 			/*
501 			 * The device does not support confidence value levels,
502 			 * so we will always have 100% for current activity and
503 			 * 0% for the others.
504 			 */
505 			if (chan->channel2 == mma9553_activity_to_mod(activity))
506 				*val = 100;
507 			else
508 				*val = 0;
509 			return IIO_VAL_INT;
510 		default:
511 			return -EINVAL;
512 		}
513 	case IIO_CHAN_INFO_RAW:
514 		switch (chan->type) {
515 		case IIO_VELOCITY:	/* m/h */
516 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
517 				return -EINVAL;
518 			ret = mma9553_read_status_word(data,
519 						       MMA9553_REG_SPEED,
520 						       &tmp);
521 			if (ret < 0)
522 				return ret;
523 			*val = tmp;
524 			return IIO_VAL_INT;
525 		case IIO_ENERGY:	/* Cal or kcal */
526 			ret = mma9553_read_status_word(data,
527 						       MMA9553_REG_CALORIES,
528 						       &tmp);
529 			if (ret < 0)
530 				return ret;
531 			*val = tmp;
532 			return IIO_VAL_INT;
533 		case IIO_ACCEL:
534 			mutex_lock(&data->mutex);
535 			ret = mma9551_read_accel_chan(data->client,
536 						      chan, val, val2);
537 			mutex_unlock(&data->mutex);
538 			return ret;
539 		default:
540 			return -EINVAL;
541 		}
542 	case IIO_CHAN_INFO_SCALE:
543 		switch (chan->type) {
544 		case IIO_VELOCITY:	/* m/h to m/s */
545 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
546 				return -EINVAL;
547 			*val = 0;
548 			*val2 = 277;	/* 0.000277 */
549 			return IIO_VAL_INT_PLUS_MICRO;
550 		case IIO_ENERGY:	/* Cal or kcal to J */
551 			*val = 4184;
552 			return IIO_VAL_INT;
553 		case IIO_ACCEL:
554 			return mma9551_read_accel_scale(val, val2);
555 		default:
556 			return -EINVAL;
557 		}
558 	case IIO_CHAN_INFO_ENABLE:
559 		*val = data->stepcnt_enabled;
560 		return IIO_VAL_INT;
561 	case IIO_CHAN_INFO_CALIBHEIGHT:
562 		tmp = mma9553_get_bits(data->conf.height_weight,
563 				       MMA9553_MASK_CONF_HEIGHT);
564 		*val = tmp / 100;	/* cm to m */
565 		*val2 = (tmp % 100) * 10000;
566 		return IIO_VAL_INT_PLUS_MICRO;
567 	case IIO_CHAN_INFO_CALIBWEIGHT:
568 		*val = mma9553_get_bits(data->conf.height_weight,
569 					MMA9553_MASK_CONF_WEIGHT);
570 		return IIO_VAL_INT;
571 	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
572 		switch (chan->type) {
573 		case IIO_STEPS:
574 			*val = mma9553_get_bits(data->conf.filter,
575 						MMA9553_MASK_CONF_FILTSTEP);
576 			return IIO_VAL_INT;
577 		default:
578 			return -EINVAL;
579 		}
580 	case IIO_CHAN_INFO_DEBOUNCE_TIME:
581 		switch (chan->type) {
582 		case IIO_STEPS:
583 			*val = mma9553_get_bits(data->conf.filter,
584 						MMA9553_MASK_CONF_FILTTIME);
585 			return IIO_VAL_INT;
586 		default:
587 			return -EINVAL;
588 		}
589 	case IIO_CHAN_INFO_INT_TIME:
590 		switch (chan->type) {
591 		case IIO_VELOCITY:
592 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
593 				return -EINVAL;
594 			*val = mma9553_get_bits(data->conf.speed_step,
595 						MMA9553_MASK_CONF_SPDPRD);
596 			return IIO_VAL_INT;
597 		default:
598 			return -EINVAL;
599 		}
600 	default:
601 		return -EINVAL;
602 	}
603 }
604 
mma9553_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)605 static int mma9553_write_raw(struct iio_dev *indio_dev,
606 			     struct iio_chan_spec const *chan,
607 			     int val, int val2, long mask)
608 {
609 	struct mma9553_data *data = iio_priv(indio_dev);
610 	int ret, tmp;
611 
612 	switch (mask) {
613 	case IIO_CHAN_INFO_ENABLE:
614 		if (data->stepcnt_enabled == !!val)
615 			return 0;
616 		mutex_lock(&data->mutex);
617 		ret = mma9551_set_power_state(data->client, val);
618 		if (ret < 0) {
619 			mutex_unlock(&data->mutex);
620 			return ret;
621 		}
622 		data->stepcnt_enabled = val;
623 		mutex_unlock(&data->mutex);
624 		return 0;
625 	case IIO_CHAN_INFO_CALIBHEIGHT:
626 		/* m to cm */
627 		tmp = val * 100 + val2 / 10000;
628 		if (tmp < 0 || tmp > 255)
629 			return -EINVAL;
630 		mutex_lock(&data->mutex);
631 		ret = mma9553_set_config(data,
632 					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
633 					 &data->conf.height_weight,
634 					 tmp, MMA9553_MASK_CONF_HEIGHT);
635 		mutex_unlock(&data->mutex);
636 		return ret;
637 	case IIO_CHAN_INFO_CALIBWEIGHT:
638 		if (val < 0 || val > 255)
639 			return -EINVAL;
640 		mutex_lock(&data->mutex);
641 		ret = mma9553_set_config(data,
642 					 MMA9553_REG_CONF_HEIGHT_WEIGHT,
643 					 &data->conf.height_weight,
644 					 val, MMA9553_MASK_CONF_WEIGHT);
645 		mutex_unlock(&data->mutex);
646 		return ret;
647 	case IIO_CHAN_INFO_DEBOUNCE_COUNT:
648 		switch (chan->type) {
649 		case IIO_STEPS:
650 			/*
651 			 * Set to 0 to disable step filtering. If the value
652 			 * specified is greater than 6, then 6 will be used.
653 			 */
654 			if (val < 0)
655 				return -EINVAL;
656 			if (val > 6)
657 				val = 6;
658 			mutex_lock(&data->mutex);
659 			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
660 						 &data->conf.filter, val,
661 						 MMA9553_MASK_CONF_FILTSTEP);
662 			mutex_unlock(&data->mutex);
663 			return ret;
664 		default:
665 			return -EINVAL;
666 		}
667 	case IIO_CHAN_INFO_DEBOUNCE_TIME:
668 		switch (chan->type) {
669 		case IIO_STEPS:
670 			if (val < 0 || val > 127)
671 				return -EINVAL;
672 			mutex_lock(&data->mutex);
673 			ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
674 						 &data->conf.filter, val,
675 						 MMA9553_MASK_CONF_FILTTIME);
676 			mutex_unlock(&data->mutex);
677 			return ret;
678 		default:
679 			return -EINVAL;
680 		}
681 	case IIO_CHAN_INFO_INT_TIME:
682 		switch (chan->type) {
683 		case IIO_VELOCITY:
684 			if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
685 				return -EINVAL;
686 			/*
687 			 * If set to a value greater than 5, then 5 will be
688 			 * used. Warning: Do not set SPDPRD to 0 or 1 as
689 			 * this may cause undesirable behavior.
690 			 */
691 			if (val < 2)
692 				return -EINVAL;
693 			if (val > 5)
694 				val = 5;
695 			mutex_lock(&data->mutex);
696 			ret = mma9553_set_config(data,
697 						 MMA9553_REG_CONF_SPEED_STEP,
698 						 &data->conf.speed_step, val,
699 						 MMA9553_MASK_CONF_SPDPRD);
700 			mutex_unlock(&data->mutex);
701 			return ret;
702 		default:
703 			return -EINVAL;
704 		}
705 	default:
706 		return -EINVAL;
707 	}
708 }
709 
mma9553_read_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir)710 static int mma9553_read_event_config(struct iio_dev *indio_dev,
711 				     const struct iio_chan_spec *chan,
712 				     enum iio_event_type type,
713 				     enum iio_event_direction dir)
714 {
715 	struct mma9553_data *data = iio_priv(indio_dev);
716 	struct mma9553_event *event;
717 
718 	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
719 	if (!event)
720 		return -EINVAL;
721 
722 	return event->enabled;
723 }
724 
mma9553_write_event_config(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,int state)725 static int mma9553_write_event_config(struct iio_dev *indio_dev,
726 				      const struct iio_chan_spec *chan,
727 				      enum iio_event_type type,
728 				      enum iio_event_direction dir, int state)
729 {
730 	struct mma9553_data *data = iio_priv(indio_dev);
731 	struct mma9553_event *event;
732 	int ret;
733 
734 	event = mma9553_get_event(data, chan->type, chan->channel2, dir);
735 	if (!event)
736 		return -EINVAL;
737 
738 	if (event->enabled == state)
739 		return 0;
740 
741 	mutex_lock(&data->mutex);
742 
743 	ret = mma9551_set_power_state(data->client, state);
744 	if (ret < 0)
745 		goto err_out;
746 	event->enabled = state;
747 
748 	ret = mma9553_conf_gpio(data);
749 	if (ret < 0)
750 		goto err_conf_gpio;
751 
752 	mutex_unlock(&data->mutex);
753 
754 	return 0;
755 
756 err_conf_gpio:
757 	if (state) {
758 		event->enabled = false;
759 		mma9551_set_power_state(data->client, false);
760 	}
761 err_out:
762 	mutex_unlock(&data->mutex);
763 	return ret;
764 }
765 
mma9553_read_event_value(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int * val,int * val2)766 static int mma9553_read_event_value(struct iio_dev *indio_dev,
767 				    const struct iio_chan_spec *chan,
768 				    enum iio_event_type type,
769 				    enum iio_event_direction dir,
770 				    enum iio_event_info info,
771 				    int *val, int *val2)
772 {
773 	struct mma9553_data *data = iio_priv(indio_dev);
774 
775 	*val2 = 0;
776 	switch (info) {
777 	case IIO_EV_INFO_VALUE:
778 		switch (chan->type) {
779 		case IIO_STEPS:
780 			*val = mma9553_get_bits(data->conf.speed_step,
781 						MMA9553_MASK_CONF_STEPCOALESCE);
782 			return IIO_VAL_INT;
783 		case IIO_ACTIVITY:
784 			/*
785 			 * The device does not support confidence value levels.
786 			 * We set an average of 50%.
787 			 */
788 			*val = 50;
789 			return IIO_VAL_INT;
790 		default:
791 			return -EINVAL;
792 		}
793 	case IIO_EV_INFO_PERIOD:
794 		switch (chan->type) {
795 		case IIO_ACTIVITY:
796 			*val = MMA9553_ACTIVITY_THD_TO_SEC(data->conf.actthd);
797 			return IIO_VAL_INT;
798 		default:
799 			return -EINVAL;
800 		}
801 	default:
802 		return -EINVAL;
803 	}
804 }
805 
mma9553_write_event_value(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,enum iio_event_type type,enum iio_event_direction dir,enum iio_event_info info,int val,int val2)806 static int mma9553_write_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 	int ret;
815 
816 	switch (info) {
817 	case IIO_EV_INFO_VALUE:
818 		switch (chan->type) {
819 		case IIO_STEPS:
820 			if (val < 0 || val > 255)
821 				return -EINVAL;
822 			mutex_lock(&data->mutex);
823 			ret = mma9553_set_config(data,
824 						MMA9553_REG_CONF_SPEED_STEP,
825 						&data->conf.speed_step, val,
826 						MMA9553_MASK_CONF_STEPCOALESCE);
827 			mutex_unlock(&data->mutex);
828 			return ret;
829 		default:
830 			return -EINVAL;
831 		}
832 	case IIO_EV_INFO_PERIOD:
833 		switch (chan->type) {
834 		case IIO_ACTIVITY:
835 			if (val < 0 || val > MMA9553_ACTIVITY_THD_TO_SEC(
836 			    MMA9553_MAX_ACTTHD))
837 				return -EINVAL;
838 			mutex_lock(&data->mutex);
839 			ret = mma9553_set_config(data, MMA9553_REG_CONF_ACTTHD,
840 						 &data->conf.actthd,
841 						 MMA9553_ACTIVITY_SEC_TO_THD
842 						 (val), MMA9553_MASK_CONF_WORD);
843 			mutex_unlock(&data->mutex);
844 			return ret;
845 		default:
846 			return -EINVAL;
847 		}
848 	default:
849 		return -EINVAL;
850 	}
851 }
852 
mma9553_get_calibgender_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan)853 static int mma9553_get_calibgender_mode(struct iio_dev *indio_dev,
854 					const struct iio_chan_spec *chan)
855 {
856 	struct mma9553_data *data = iio_priv(indio_dev);
857 	u8 gender;
858 
859 	gender = mma9553_get_bits(data->conf.filter, MMA9553_MASK_CONF_MALE);
860 	/*
861 	 * HW expects 0 for female and 1 for male,
862 	 * while iio index is 0 for male and 1 for female.
863 	 */
864 	return !gender;
865 }
866 
mma9553_set_calibgender_mode(struct iio_dev * indio_dev,const struct iio_chan_spec * chan,unsigned int mode)867 static int mma9553_set_calibgender_mode(struct iio_dev *indio_dev,
868 					const struct iio_chan_spec *chan,
869 					unsigned int mode)
870 {
871 	struct mma9553_data *data = iio_priv(indio_dev);
872 	u8 gender = !mode;
873 	int ret;
874 
875 	if ((mode != 0) && (mode != 1))
876 		return -EINVAL;
877 	mutex_lock(&data->mutex);
878 	ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
879 				 &data->conf.filter, gender,
880 				 MMA9553_MASK_CONF_MALE);
881 	mutex_unlock(&data->mutex);
882 
883 	return ret;
884 }
885 
886 static const struct iio_event_spec mma9553_step_event = {
887 	.type = IIO_EV_TYPE_CHANGE,
888 	.dir = IIO_EV_DIR_NONE,
889 	.mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
890 };
891 
892 static const struct iio_event_spec mma9553_activity_events[] = {
893 	{
894 		.type = IIO_EV_TYPE_THRESH,
895 		.dir = IIO_EV_DIR_RISING,
896 		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
897 				 BIT(IIO_EV_INFO_VALUE) |
898 				 BIT(IIO_EV_INFO_PERIOD),
899 	 },
900 	{
901 		.type = IIO_EV_TYPE_THRESH,
902 		.dir = IIO_EV_DIR_FALLING,
903 		.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
904 				 BIT(IIO_EV_INFO_VALUE) |
905 				 BIT(IIO_EV_INFO_PERIOD),
906 	},
907 };
908 
909 static const char * const mma9553_calibgender_modes[] = { "male", "female" };
910 
911 static const struct iio_enum mma9553_calibgender_enum = {
912 	.items = mma9553_calibgender_modes,
913 	.num_items = ARRAY_SIZE(mma9553_calibgender_modes),
914 	.get = mma9553_get_calibgender_mode,
915 	.set = mma9553_set_calibgender_mode,
916 };
917 
918 static const struct iio_chan_spec_ext_info mma9553_ext_info[] = {
919 	IIO_ENUM("calibgender", IIO_SHARED_BY_TYPE, &mma9553_calibgender_enum),
920 	IIO_ENUM_AVAILABLE("calibgender", IIO_SHARED_BY_TYPE, &mma9553_calibgender_enum),
921 	{},
922 };
923 
924 #define MMA9553_PEDOMETER_CHANNEL(_type, _mask) {		\
925 	.type = _type,						\
926 	.info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE)      |	\
927 			      BIT(IIO_CHAN_INFO_CALIBHEIGHT) |	\
928 			      _mask,				\
929 	.ext_info = mma9553_ext_info,				\
930 }
931 
932 #define MMA9553_ACTIVITY_CHANNEL(_chan2) {				\
933 	.type = IIO_ACTIVITY,						\
934 	.modified = 1,							\
935 	.channel2 = _chan2,						\
936 	.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),		\
937 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT) |	\
938 				    BIT(IIO_CHAN_INFO_ENABLE),		\
939 	.event_spec = mma9553_activity_events,				\
940 	.num_event_specs = ARRAY_SIZE(mma9553_activity_events),		\
941 	.ext_info = mma9553_ext_info,					\
942 }
943 
944 static const struct iio_chan_spec mma9553_channels[] = {
945 	MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
946 	MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
947 	MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
948 
949 	{
950 		.type = IIO_STEPS,
951 		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
952 				     BIT(IIO_CHAN_INFO_ENABLE) |
953 				     BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
954 				     BIT(IIO_CHAN_INFO_DEBOUNCE_TIME),
955 		.event_spec = &mma9553_step_event,
956 		.num_event_specs = 1,
957 	},
958 
959 	MMA9553_PEDOMETER_CHANNEL(IIO_DISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
960 	{
961 		.type = IIO_VELOCITY,
962 		.modified = 1,
963 		.channel2 = IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
964 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
965 				      BIT(IIO_CHAN_INFO_SCALE) |
966 				      BIT(IIO_CHAN_INFO_INT_TIME) |
967 				      BIT(IIO_CHAN_INFO_ENABLE),
968 		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT),
969 		.ext_info = mma9553_ext_info,
970 	},
971 	MMA9553_PEDOMETER_CHANNEL(IIO_ENERGY, BIT(IIO_CHAN_INFO_RAW) |
972 				  BIT(IIO_CHAN_INFO_SCALE) |
973 				  BIT(IIO_CHAN_INFO_CALIBWEIGHT)),
974 
975 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
976 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_JOGGING),
977 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
978 	MMA9553_ACTIVITY_CHANNEL(IIO_MOD_STILL),
979 };
980 
981 static const struct iio_info mma9553_info = {
982 	.read_raw = mma9553_read_raw,
983 	.write_raw = mma9553_write_raw,
984 	.read_event_config = mma9553_read_event_config,
985 	.write_event_config = mma9553_write_event_config,
986 	.read_event_value = mma9553_read_event_value,
987 	.write_event_value = mma9553_write_event_value,
988 };
989 
mma9553_irq_handler(int irq,void * private)990 static irqreturn_t mma9553_irq_handler(int irq, void *private)
991 {
992 	struct iio_dev *indio_dev = private;
993 	struct mma9553_data *data = iio_priv(indio_dev);
994 
995 	data->timestamp = iio_get_time_ns(indio_dev);
996 	/*
997 	 * Since we only configure the interrupt pin when an
998 	 * event is enabled, we are sure we have at least
999 	 * one event enabled at this point.
1000 	 */
1001 	return IRQ_WAKE_THREAD;
1002 }
1003 
mma9553_event_handler(int irq,void * private)1004 static irqreturn_t mma9553_event_handler(int irq, void *private)
1005 {
1006 	struct iio_dev *indio_dev = private;
1007 	struct mma9553_data *data = iio_priv(indio_dev);
1008 	u16 stepcnt;
1009 	u8 activity;
1010 	struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
1011 	int ret;
1012 
1013 	mutex_lock(&data->mutex);
1014 	ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
1015 	if (ret < 0) {
1016 		mutex_unlock(&data->mutex);
1017 		return IRQ_HANDLED;
1018 	}
1019 
1020 	ev_prev_activity = mma9553_get_event(data, IIO_ACTIVITY,
1021 					     mma9553_activity_to_mod(
1022 					     data->activity),
1023 					     IIO_EV_DIR_FALLING);
1024 	ev_activity = mma9553_get_event(data, IIO_ACTIVITY,
1025 					mma9553_activity_to_mod(activity),
1026 					IIO_EV_DIR_RISING);
1027 	ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
1028 					   IIO_EV_DIR_NONE);
1029 
1030 	if (ev_step_detect->enabled && (stepcnt != data->stepcnt)) {
1031 		data->stepcnt = stepcnt;
1032 		iio_push_event(indio_dev,
1033 			       IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
1034 					      IIO_EV_DIR_NONE,
1035 					      IIO_EV_TYPE_CHANGE, 0, 0, 0),
1036 			       data->timestamp);
1037 	}
1038 
1039 	if (activity != data->activity) {
1040 		data->activity = activity;
1041 		/* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
1042 		if (ev_prev_activity && ev_prev_activity->enabled)
1043 			iio_push_event(indio_dev,
1044 				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1045 						    ev_prev_activity->info->mod,
1046 						    IIO_EV_DIR_FALLING,
1047 						    IIO_EV_TYPE_THRESH, 0, 0,
1048 						    0),
1049 				       data->timestamp);
1050 
1051 		if (ev_activity && ev_activity->enabled)
1052 			iio_push_event(indio_dev,
1053 				       IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1054 						      ev_activity->info->mod,
1055 						      IIO_EV_DIR_RISING,
1056 						      IIO_EV_TYPE_THRESH, 0, 0,
1057 						      0),
1058 				       data->timestamp);
1059 	}
1060 	mutex_unlock(&data->mutex);
1061 
1062 	return IRQ_HANDLED;
1063 }
1064 
mma9553_match_acpi_device(struct device * dev)1065 static const char *mma9553_match_acpi_device(struct device *dev)
1066 {
1067 	const struct acpi_device_id *id;
1068 
1069 	id = acpi_match_device(dev->driver->acpi_match_table, dev);
1070 	if (!id)
1071 		return NULL;
1072 
1073 	return dev_name(dev);
1074 }
1075 
mma9553_probe(struct i2c_client * client,const struct i2c_device_id * id)1076 static int mma9553_probe(struct i2c_client *client,
1077 			 const struct i2c_device_id *id)
1078 {
1079 	struct mma9553_data *data;
1080 	struct iio_dev *indio_dev;
1081 	const char *name = NULL;
1082 	int ret;
1083 
1084 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1085 	if (!indio_dev)
1086 		return -ENOMEM;
1087 
1088 	data = iio_priv(indio_dev);
1089 	i2c_set_clientdata(client, indio_dev);
1090 	data->client = client;
1091 
1092 	if (id)
1093 		name = id->name;
1094 	else if (ACPI_HANDLE(&client->dev))
1095 		name = mma9553_match_acpi_device(&client->dev);
1096 	else
1097 		return -ENOSYS;
1098 
1099 	mutex_init(&data->mutex);
1100 	mma9553_init_events(data);
1101 
1102 	ret = mma9553_init(data);
1103 	if (ret < 0)
1104 		return ret;
1105 
1106 	indio_dev->channels = mma9553_channels;
1107 	indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
1108 	indio_dev->name = name;
1109 	indio_dev->modes = INDIO_DIRECT_MODE;
1110 	indio_dev->info = &mma9553_info;
1111 
1112 	if (client->irq > 0) {
1113 		ret = devm_request_threaded_irq(&client->dev, client->irq,
1114 						mma9553_irq_handler,
1115 						mma9553_event_handler,
1116 						IRQF_TRIGGER_RISING,
1117 						MMA9553_IRQ_NAME, indio_dev);
1118 		if (ret < 0) {
1119 			dev_err(&client->dev, "request irq %d failed\n",
1120 				client->irq);
1121 			goto out_poweroff;
1122 		}
1123 	}
1124 
1125 	ret = pm_runtime_set_active(&client->dev);
1126 	if (ret < 0)
1127 		goto out_poweroff;
1128 
1129 	pm_runtime_enable(&client->dev);
1130 	pm_runtime_set_autosuspend_delay(&client->dev,
1131 					 MMA9551_AUTO_SUSPEND_DELAY_MS);
1132 	pm_runtime_use_autosuspend(&client->dev);
1133 
1134 	ret = iio_device_register(indio_dev);
1135 	if (ret < 0) {
1136 		dev_err(&client->dev, "unable to register iio device\n");
1137 		goto err_pm_cleanup;
1138 	}
1139 
1140 	dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
1141 	return 0;
1142 
1143 err_pm_cleanup:
1144 	pm_runtime_dont_use_autosuspend(&client->dev);
1145 	pm_runtime_disable(&client->dev);
1146 out_poweroff:
1147 	mma9551_set_device_state(client, false);
1148 	return ret;
1149 }
1150 
mma9553_remove(struct i2c_client * client)1151 static void mma9553_remove(struct i2c_client *client)
1152 {
1153 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
1154 	struct mma9553_data *data = iio_priv(indio_dev);
1155 
1156 	iio_device_unregister(indio_dev);
1157 
1158 	pm_runtime_disable(&client->dev);
1159 	pm_runtime_set_suspended(&client->dev);
1160 
1161 	mutex_lock(&data->mutex);
1162 	mma9551_set_device_state(data->client, false);
1163 	mutex_unlock(&data->mutex);
1164 }
1165 
mma9553_runtime_suspend(struct device * dev)1166 static int mma9553_runtime_suspend(struct device *dev)
1167 {
1168 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1169 	struct mma9553_data *data = iio_priv(indio_dev);
1170 	int ret;
1171 
1172 	mutex_lock(&data->mutex);
1173 	ret = mma9551_set_device_state(data->client, false);
1174 	mutex_unlock(&data->mutex);
1175 	if (ret < 0) {
1176 		dev_err(&data->client->dev, "powering off device failed\n");
1177 		return -EAGAIN;
1178 	}
1179 
1180 	return 0;
1181 }
1182 
mma9553_runtime_resume(struct device * dev)1183 static int mma9553_runtime_resume(struct device *dev)
1184 {
1185 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1186 	struct mma9553_data *data = iio_priv(indio_dev);
1187 	int ret;
1188 
1189 	ret = mma9551_set_device_state(data->client, true);
1190 	if (ret < 0)
1191 		return ret;
1192 
1193 	mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
1194 
1195 	return 0;
1196 }
1197 
mma9553_suspend(struct device * dev)1198 static int mma9553_suspend(struct device *dev)
1199 {
1200 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1201 	struct mma9553_data *data = iio_priv(indio_dev);
1202 	int ret;
1203 
1204 	mutex_lock(&data->mutex);
1205 	ret = mma9551_set_device_state(data->client, false);
1206 	mutex_unlock(&data->mutex);
1207 
1208 	return ret;
1209 }
1210 
mma9553_resume(struct device * dev)1211 static int mma9553_resume(struct device *dev)
1212 {
1213 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1214 	struct mma9553_data *data = iio_priv(indio_dev);
1215 	int ret;
1216 
1217 	mutex_lock(&data->mutex);
1218 	ret = mma9551_set_device_state(data->client, true);
1219 	mutex_unlock(&data->mutex);
1220 
1221 	return ret;
1222 }
1223 
1224 static const struct dev_pm_ops mma9553_pm_ops = {
1225 	SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
1226 	RUNTIME_PM_OPS(mma9553_runtime_suspend, mma9553_runtime_resume, NULL)
1227 };
1228 
1229 static const struct acpi_device_id mma9553_acpi_match[] = {
1230 	{"MMA9553", 0},
1231 	{},
1232 };
1233 
1234 MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
1235 
1236 static const struct i2c_device_id mma9553_id[] = {
1237 	{"mma9553", 0},
1238 	{},
1239 };
1240 
1241 MODULE_DEVICE_TABLE(i2c, mma9553_id);
1242 
1243 static struct i2c_driver mma9553_driver = {
1244 	.driver = {
1245 		   .name = MMA9553_DRV_NAME,
1246 		   .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
1247 		   .pm = pm_ptr(&mma9553_pm_ops),
1248 		   },
1249 	.probe = mma9553_probe,
1250 	.remove = mma9553_remove,
1251 	.id_table = mma9553_id,
1252 };
1253 
1254 module_i2c_driver(mma9553_driver);
1255 
1256 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1257 MODULE_LICENSE("GPL v2");
1258 MODULE_DESCRIPTION("MMA9553L pedometer platform driver");
1259 MODULE_IMPORT_NS(IIO_MMA9551);
1260