Loading...
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 */
104enum activity_level {
105 ACTIVITY_UNKNOWN,
106 ACTIVITY_REST,
107 ACTIVITY_WALKING,
108 ACTIVITY_JOGGING,
109 ACTIVITY_RUNNING,
110};
111
112static 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
166struct mma9553_event {
167 struct mma9553_event_info *info;
168 bool enabled;
169};
170
171struct 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
182struct 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
203static u8 mma9553_get_bits(u16 val, u16 mask)
204{
205 return (val & mask) >> (ffs(mask) - 1);
206}
207
208static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
209{
210 return (current_val & ~mask) | (val << (ffs(mask) - 1));
211}
212
213static 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
230static 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
241static 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
257static 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
272static 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
321static 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
342static 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
387static 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
445static 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
471static 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
614static 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
719static 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
734static 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
765err_conf_gpio:
766 if (state) {
767 event->enabled = false;
768 mma9551_set_power_state(data->client, false);
769 }
770err_out:
771 mutex_unlock(&data->mutex);
772 return ret;
773}
774
775static 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
815static 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
862static 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
876static 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
895static 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
901static 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
918static const char * const mma9553_calibgender_modes[] = { "male", "female" };
919
920static 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
927static 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
953static 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
990static 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
1000static 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
1014static 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
1075static 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
1086static 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 = pm_runtime_set_active(&client->dev);
1137 if (ret < 0)
1138 goto out_poweroff;
1139
1140 pm_runtime_enable(&client->dev);
1141 pm_runtime_set_autosuspend_delay(&client->dev,
1142 MMA9551_AUTO_SUSPEND_DELAY_MS);
1143 pm_runtime_use_autosuspend(&client->dev);
1144
1145 ret = iio_device_register(indio_dev);
1146 if (ret < 0) {
1147 dev_err(&client->dev, "unable to register iio device\n");
1148 goto out_poweroff;
1149 }
1150
1151 dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
1152 return 0;
1153
1154out_poweroff:
1155 mma9551_set_device_state(client, false);
1156 return ret;
1157}
1158
1159static int mma9553_remove(struct i2c_client *client)
1160{
1161 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1162 struct mma9553_data *data = iio_priv(indio_dev);
1163
1164 iio_device_unregister(indio_dev);
1165
1166 pm_runtime_disable(&client->dev);
1167 pm_runtime_set_suspended(&client->dev);
1168 pm_runtime_put_noidle(&client->dev);
1169
1170 mutex_lock(&data->mutex);
1171 mma9551_set_device_state(data->client, false);
1172 mutex_unlock(&data->mutex);
1173
1174 return 0;
1175}
1176
1177#ifdef CONFIG_PM
1178static int mma9553_runtime_suspend(struct device *dev)
1179{
1180 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1181 struct mma9553_data *data = iio_priv(indio_dev);
1182 int ret;
1183
1184 mutex_lock(&data->mutex);
1185 ret = mma9551_set_device_state(data->client, false);
1186 mutex_unlock(&data->mutex);
1187 if (ret < 0) {
1188 dev_err(&data->client->dev, "powering off device failed\n");
1189 return -EAGAIN;
1190 }
1191
1192 return 0;
1193}
1194
1195static int mma9553_runtime_resume(struct device *dev)
1196{
1197 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1198 struct mma9553_data *data = iio_priv(indio_dev);
1199 int ret;
1200
1201 ret = mma9551_set_device_state(data->client, true);
1202 if (ret < 0)
1203 return ret;
1204
1205 mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
1206
1207 return 0;
1208}
1209#endif
1210
1211#ifdef CONFIG_PM_SLEEP
1212static int mma9553_suspend(struct device *dev)
1213{
1214 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1215 struct mma9553_data *data = iio_priv(indio_dev);
1216 int ret;
1217
1218 mutex_lock(&data->mutex);
1219 ret = mma9551_set_device_state(data->client, false);
1220 mutex_unlock(&data->mutex);
1221
1222 return ret;
1223}
1224
1225static int mma9553_resume(struct device *dev)
1226{
1227 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1228 struct mma9553_data *data = iio_priv(indio_dev);
1229 int ret;
1230
1231 mutex_lock(&data->mutex);
1232 ret = mma9551_set_device_state(data->client, true);
1233 mutex_unlock(&data->mutex);
1234
1235 return ret;
1236}
1237#endif
1238
1239static const struct dev_pm_ops mma9553_pm_ops = {
1240 SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
1241 SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
1242 mma9553_runtime_resume, NULL)
1243};
1244
1245static const struct acpi_device_id mma9553_acpi_match[] = {
1246 {"MMA9553", 0},
1247 {},
1248};
1249
1250MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
1251
1252static const struct i2c_device_id mma9553_id[] = {
1253 {"mma9553", 0},
1254 {},
1255};
1256
1257MODULE_DEVICE_TABLE(i2c, mma9553_id);
1258
1259static struct i2c_driver mma9553_driver = {
1260 .driver = {
1261 .name = MMA9553_DRV_NAME,
1262 .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
1263 .pm = &mma9553_pm_ops,
1264 },
1265 .probe = mma9553_probe,
1266 .remove = mma9553_remove,
1267 .id_table = mma9553_id,
1268};
1269
1270module_i2c_driver(mma9553_driver);
1271
1272MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1273MODULE_LICENSE("GPL v2");
1274MODULE_DESCRIPTION("MMA9553L pedometer platform driver");
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 */
95enum activity_level {
96 ACTIVITY_UNKNOWN,
97 ACTIVITY_REST,
98 ACTIVITY_WALKING,
99 ACTIVITY_JOGGING,
100 ACTIVITY_RUNNING,
101};
102
103static 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
157struct mma9553_event {
158 struct mma9553_event_info *info;
159 bool enabled;
160};
161
162struct 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
173struct 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
194static u8 mma9553_get_bits(u16 val, u16 mask)
195{
196 return (val & mask) >> (ffs(mask) - 1);
197}
198
199static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
200{
201 return (current_val & ~mask) | (val << (ffs(mask) - 1));
202}
203
204static 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
221static 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
232static 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
248static 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
263static 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
312static 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
333static 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
378static 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
436static 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
462static 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
605static 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
710static 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
725static 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
756err_conf_gpio:
757 if (state) {
758 event->enabled = false;
759 mma9551_set_power_state(data->client, false);
760 }
761err_out:
762 mutex_unlock(&data->mutex);
763 return ret;
764}
765
766static 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
806static 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
853static 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
867static 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
886static 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
892static 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
909static const char * const mma9553_calibgender_modes[] = { "male", "female" };
910
911static 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
918static 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
944static 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
981static 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
990static 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
1004static 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
1065static 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
1076static int mma9553_probe(struct i2c_client *client)
1077{
1078 const struct i2c_device_id *id = i2c_client_get_device_id(client);
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
1143err_pm_cleanup:
1144 pm_runtime_dont_use_autosuspend(&client->dev);
1145 pm_runtime_disable(&client->dev);
1146out_poweroff:
1147 mma9551_set_device_state(client, false);
1148 return ret;
1149}
1150
1151static 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
1166static 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
1183static 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
1198static 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
1211static 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
1224static 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
1229static const struct acpi_device_id mma9553_acpi_match[] = {
1230 {"MMA9553", 0},
1231 {},
1232};
1233
1234MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
1235
1236static const struct i2c_device_id mma9553_id[] = {
1237 {"mma9553", 0},
1238 {},
1239};
1240
1241MODULE_DEVICE_TABLE(i2c, mma9553_id);
1242
1243static 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
1254module_i2c_driver(mma9553_driver);
1255
1256MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1257MODULE_LICENSE("GPL v2");
1258MODULE_DESCRIPTION("MMA9553L pedometer platform driver");
1259MODULE_IMPORT_NS(IIO_MMA9551);