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Merge branch 'WIP.x86-pti.base.prep-for-linus' of git://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-bionic-kernel.git] / drivers / iio / accel / mma9553.c
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/iio/iio.h>
21 #include <linux/iio/sysfs.h>
22 #include <linux/iio/events.h>
23 #include <linux/pm_runtime.h>
24 #include "mma9551_core.h"
25
26 #define MMA9553_DRV_NAME "mma9553"
27 #define MMA9553_IRQ_NAME "mma9553_event"
28
29 /* Pedometer configuration registers (R/W) */
30 #define MMA9553_REG_CONF_SLEEPMIN 0x00
31 #define MMA9553_REG_CONF_SLEEPMAX 0x02
32 #define MMA9553_REG_CONF_SLEEPTHD 0x04
33 #define MMA9553_MASK_CONF_WORD GENMASK(15, 0)
34
35 #define MMA9553_REG_CONF_CONF_STEPLEN 0x06
36 #define MMA9553_MASK_CONF_CONFIG BIT(15)
37 #define MMA9553_MASK_CONF_ACT_DBCNTM BIT(14)
38 #define MMA9553_MASK_CONF_SLP_DBCNTM BIT(13)
39 #define MMA9553_MASK_CONF_STEPLEN GENMASK(7, 0)
40
41 #define MMA9553_REG_CONF_HEIGHT_WEIGHT 0x08
42 #define MMA9553_MASK_CONF_HEIGHT GENMASK(15, 8)
43 #define MMA9553_MASK_CONF_WEIGHT GENMASK(7, 0)
44
45 #define MMA9553_REG_CONF_FILTER 0x0A
46 #define MMA9553_MASK_CONF_FILTSTEP GENMASK(15, 8)
47 #define MMA9553_MASK_CONF_MALE BIT(7)
48 #define MMA9553_MASK_CONF_FILTTIME GENMASK(6, 0)
49
50 #define MMA9553_REG_CONF_SPEED_STEP 0x0C
51 #define MMA9553_MASK_CONF_SPDPRD GENMASK(15, 8)
52 #define MMA9553_MASK_CONF_STEPCOALESCE GENMASK(7, 0)
53
54 #define MMA9553_REG_CONF_ACTTHD 0x0E
55 #define MMA9553_MAX_ACTTHD GENMASK(15, 0)
56
57 /* Pedometer status registers (R-only) */
58 #define MMA9553_REG_STATUS 0x00
59 #define MMA9553_MASK_STATUS_MRGFL BIT(15)
60 #define MMA9553_MASK_STATUS_SUSPCHG BIT(14)
61 #define MMA9553_MASK_STATUS_STEPCHG BIT(13)
62 #define MMA9553_MASK_STATUS_ACTCHG BIT(12)
63 #define MMA9553_MASK_STATUS_SUSP BIT(11)
64 #define MMA9553_MASK_STATUS_ACTIVITY GENMASK(10, 8)
65 #define MMA9553_MASK_STATUS_VERSION GENMASK(7, 0)
66
67 #define MMA9553_REG_STEPCNT 0x02
68 #define MMA9553_REG_DISTANCE 0x04
69 #define MMA9553_REG_SPEED 0x06
70 #define MMA9553_REG_CALORIES 0x08
71 #define MMA9553_REG_SLEEPCNT 0x0A
72
73 /* Pedometer events are always mapped to this pin. */
74 #define MMA9553_DEFAULT_GPIO_PIN mma9551_gpio6
75 #define MMA9553_DEFAULT_GPIO_POLARITY 0
76
77 /* Bitnum used for GPIO configuration = bit number in high status byte */
78 #define MMA9553_STATUS_TO_BITNUM(bit) (ffs(bit) - 9)
79 #define MMA9553_MAX_BITNUM MMA9553_STATUS_TO_BITNUM(BIT(16))
80
81 #define MMA9553_DEFAULT_SAMPLE_RATE 30 /* Hz */
82
83 /*
84 * The internal activity level must be stable for ACTTHD samples before
85 * ACTIVITY is updated. The ACTIVITY variable contains the current activity
86 * level and is updated every time a step is detected or once a second
87 * if there are no steps.
88 */
89 #define MMA9553_ACTIVITY_THD_TO_SEC(thd) ((thd) / MMA9553_DEFAULT_SAMPLE_RATE)
90 #define MMA9553_ACTIVITY_SEC_TO_THD(sec) ((sec) * MMA9553_DEFAULT_SAMPLE_RATE)
91
92 /*
93 * Autonomously suspend pedometer if acceleration vector magnitude
94 * is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
95 */
96 #define MMA9553_DEFAULT_SLEEPMIN 3688 /* 0,9 g */
97 #define MMA9553_DEFAULT_SLEEPMAX 4508 /* 1,1 g */
98 #define MMA9553_DEFAULT_SLEEPTHD (MMA9553_DEFAULT_SAMPLE_RATE * 30)
99
100 #define MMA9553_CONFIG_RETRIES 2
101
102 /* Status register - activity field */
103 enum activity_level {
104 ACTIVITY_UNKNOWN,
105 ACTIVITY_REST,
106 ACTIVITY_WALKING,
107 ACTIVITY_JOGGING,
108 ACTIVITY_RUNNING,
109 };
110
111 static struct mma9553_event_info {
112 enum iio_chan_type type;
113 enum iio_modifier mod;
114 enum iio_event_direction dir;
115 } mma9553_events_info[] = {
116 {
117 .type = IIO_STEPS,
118 .mod = IIO_NO_MOD,
119 .dir = IIO_EV_DIR_NONE,
120 },
121 {
122 .type = IIO_ACTIVITY,
123 .mod = IIO_MOD_STILL,
124 .dir = IIO_EV_DIR_RISING,
125 },
126 {
127 .type = IIO_ACTIVITY,
128 .mod = IIO_MOD_STILL,
129 .dir = IIO_EV_DIR_FALLING,
130 },
131 {
132 .type = IIO_ACTIVITY,
133 .mod = IIO_MOD_WALKING,
134 .dir = IIO_EV_DIR_RISING,
135 },
136 {
137 .type = IIO_ACTIVITY,
138 .mod = IIO_MOD_WALKING,
139 .dir = IIO_EV_DIR_FALLING,
140 },
141 {
142 .type = IIO_ACTIVITY,
143 .mod = IIO_MOD_JOGGING,
144 .dir = IIO_EV_DIR_RISING,
145 },
146 {
147 .type = IIO_ACTIVITY,
148 .mod = IIO_MOD_JOGGING,
149 .dir = IIO_EV_DIR_FALLING,
150 },
151 {
152 .type = IIO_ACTIVITY,
153 .mod = IIO_MOD_RUNNING,
154 .dir = IIO_EV_DIR_RISING,
155 },
156 {
157 .type = IIO_ACTIVITY,
158 .mod = IIO_MOD_RUNNING,
159 .dir = IIO_EV_DIR_FALLING,
160 },
161 };
162
163 #define MMA9553_EVENTS_INFO_SIZE ARRAY_SIZE(mma9553_events_info)
164
165 struct mma9553_event {
166 struct mma9553_event_info *info;
167 bool enabled;
168 };
169
170 struct mma9553_conf_regs {
171 u16 sleepmin;
172 u16 sleepmax;
173 u16 sleepthd;
174 u16 config;
175 u16 height_weight;
176 u16 filter;
177 u16 speed_step;
178 u16 actthd;
179 } __packed;
180
181 struct mma9553_data {
182 struct i2c_client *client;
183 /*
184 * 1. Serialize access to HW (requested by mma9551_core API).
185 * 2. Serialize sequences that power on/off the device and access HW.
186 */
187 struct mutex mutex;
188 struct mma9553_conf_regs conf;
189 struct mma9553_event events[MMA9553_EVENTS_INFO_SIZE];
190 int num_events;
191 u8 gpio_bitnum;
192 /*
193 * This is used for all features that depend on step count:
194 * step count, distance, speed, calories.
195 */
196 bool stepcnt_enabled;
197 u16 stepcnt;
198 u8 activity;
199 s64 timestamp;
200 };
201
202 static u8 mma9553_get_bits(u16 val, u16 mask)
203 {
204 return (val & mask) >> (ffs(mask) - 1);
205 }
206
207 static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
208 {
209 return (current_val & ~mask) | (val << (ffs(mask) - 1));
210 }
211
212 static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
213 {
214 switch (activity) {
215 case ACTIVITY_RUNNING:
216 return IIO_MOD_RUNNING;
217 case ACTIVITY_JOGGING:
218 return IIO_MOD_JOGGING;
219 case ACTIVITY_WALKING:
220 return IIO_MOD_WALKING;
221 case ACTIVITY_REST:
222 return IIO_MOD_STILL;
223 case ACTIVITY_UNKNOWN:
224 default:
225 return IIO_NO_MOD;
226 }
227 }
228
229 static void mma9553_init_events(struct mma9553_data *data)
230 {
231 int i;
232
233 data->num_events = MMA9553_EVENTS_INFO_SIZE;
234 for (i = 0; i < data->num_events; i++) {
235 data->events[i].info = &mma9553_events_info[i];
236 data->events[i].enabled = false;
237 }
238 }
239
240 static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
241 enum iio_chan_type type,
242 enum iio_modifier mod,
243 enum iio_event_direction dir)
244 {
245 int i;
246
247 for (i = 0; i < data->num_events; i++)
248 if (data->events[i].info->type == type &&
249 data->events[i].info->mod == mod &&
250 data->events[i].info->dir == dir)
251 return &data->events[i];
252
253 return NULL;
254 }
255
256 static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
257 bool check_type,
258 enum iio_chan_type type)
259 {
260 int i;
261
262 for (i = 0; i < data->num_events; i++)
263 if ((check_type && data->events[i].info->type == type &&
264 data->events[i].enabled) ||
265 (!check_type && data->events[i].enabled))
266 return true;
267
268 return false;
269 }
270
271 static int mma9553_set_config(struct mma9553_data *data, u16 reg,
272 u16 *p_reg_val, u16 val, u16 mask)
273 {
274 int ret, retries;
275 u16 reg_val, config;
276
277 reg_val = *p_reg_val;
278 if (val == mma9553_get_bits(reg_val, mask))
279 return 0;
280
281 reg_val = mma9553_set_bits(reg_val, val, mask);
282 ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
283 reg, reg_val);
284 if (ret < 0) {
285 dev_err(&data->client->dev,
286 "error writing config register 0x%x\n", reg);
287 return ret;
288 }
289
290 *p_reg_val = reg_val;
291
292 /* Reinitializes the pedometer with current configuration values */
293 config = mma9553_set_bits(data->conf.config, 1,
294 MMA9553_MASK_CONF_CONFIG);
295
296 ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
297 MMA9553_REG_CONF_CONF_STEPLEN, config);
298 if (ret < 0) {
299 dev_err(&data->client->dev,
300 "error writing config register 0x%x\n",
301 MMA9553_REG_CONF_CONF_STEPLEN);
302 return ret;
303 }
304
305 retries = MMA9553_CONFIG_RETRIES;
306 do {
307 mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
308 ret = mma9551_read_config_word(data->client,
309 MMA9551_APPID_PEDOMETER,
310 MMA9553_REG_CONF_CONF_STEPLEN,
311 &config);
312 if (ret < 0)
313 return ret;
314 } while (mma9553_get_bits(config, MMA9553_MASK_CONF_CONFIG) &&
315 --retries > 0);
316
317 return 0;
318 }
319
320 static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
321 u8 *activity, u16 *stepcnt)
322 {
323 u16 buf[2];
324 int ret;
325
326 ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
327 MMA9553_REG_STATUS, ARRAY_SIZE(buf),
328 buf);
329 if (ret < 0) {
330 dev_err(&data->client->dev,
331 "error reading status and stepcnt\n");
332 return ret;
333 }
334
335 *activity = mma9553_get_bits(buf[0], MMA9553_MASK_STATUS_ACTIVITY);
336 *stepcnt = buf[1];
337
338 return 0;
339 }
340
341 static int mma9553_conf_gpio(struct mma9553_data *data)
342 {
343 u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
344 int ret;
345 struct mma9553_event *ev_step_detect;
346 bool activity_enabled;
347
348 activity_enabled = mma9553_is_any_event_enabled(data, true,
349 IIO_ACTIVITY);
350 ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
351 IIO_EV_DIR_NONE);
352
353 /*
354 * If both step detector and activity are enabled, use the MRGFL bit.
355 * This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
356 */
357 if (activity_enabled && ev_step_detect->enabled)
358 bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_MRGFL);
359 else if (ev_step_detect->enabled)
360 bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_STEPCHG);
361 else if (activity_enabled)
362 bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_ACTCHG);
363 else /* Reset */
364 appid = MMA9551_APPID_NONE;
365
366 if (data->gpio_bitnum == bitnum)
367 return 0;
368
369 /* Save initial values for activity and stepcnt */
370 if (activity_enabled || ev_step_detect->enabled) {
371 ret = mma9553_read_activity_stepcnt(data, &data->activity,
372 &data->stepcnt);
373 if (ret < 0)
374 return ret;
375 }
376
377 ret = mma9551_gpio_config(data->client, MMA9553_DEFAULT_GPIO_PIN, appid,
378 bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
379 if (ret < 0)
380 return ret;
381 data->gpio_bitnum = bitnum;
382
383 return 0;
384 }
385
386 static int mma9553_init(struct mma9553_data *data)
387 {
388 int ret;
389
390 ret = mma9551_read_version(data->client);
391 if (ret)
392 return ret;
393
394 /*
395 * Read all the pedometer configuration registers. This is used as
396 * a device identification command to differentiate the MMA9553L
397 * from the MMA9550L.
398 */
399 ret = mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
400 MMA9553_REG_CONF_SLEEPMIN,
401 sizeof(data->conf) / sizeof(u16),
402 (u16 *)&data->conf);
403 if (ret < 0) {
404 dev_err(&data->client->dev,
405 "failed to read configuration registers\n");
406 return ret;
407 }
408
409 /* Reset GPIO */
410 data->gpio_bitnum = MMA9553_MAX_BITNUM;
411 ret = mma9553_conf_gpio(data);
412 if (ret < 0)
413 return ret;
414
415 ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
416 if (ret < 0)
417 return ret;
418
419 /* Init config registers */
420 data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
421 data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
422 data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
423 data->conf.config = mma9553_set_bits(data->conf.config, 1,
424 MMA9553_MASK_CONF_CONFIG);
425 /*
426 * Clear the activity debounce counter when the activity level changes,
427 * so that the confidence level applies for any activity level.
428 */
429 data->conf.config = mma9553_set_bits(data->conf.config, 1,
430 MMA9553_MASK_CONF_ACT_DBCNTM);
431 ret = mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
432 MMA9553_REG_CONF_SLEEPMIN,
433 sizeof(data->conf) / sizeof(u16),
434 (u16 *)&data->conf);
435 if (ret < 0) {
436 dev_err(&data->client->dev,
437 "failed to write configuration registers\n");
438 return ret;
439 }
440
441 return mma9551_set_device_state(data->client, true);
442 }
443
444 static int mma9553_read_status_word(struct mma9553_data *data, u16 reg,
445 u16 *tmp)
446 {
447 bool powered_on;
448 int ret;
449
450 /*
451 * The HW only counts steps and other dependent
452 * parameters (speed, distance, calories, activity)
453 * if power is on (from enabling an event or the
454 * step counter).
455 */
456 powered_on = mma9553_is_any_event_enabled(data, false, 0) ||
457 data->stepcnt_enabled;
458 if (!powered_on) {
459 dev_err(&data->client->dev, "No channels enabled\n");
460 return -EINVAL;
461 }
462
463 mutex_lock(&data->mutex);
464 ret = mma9551_read_status_word(data->client, MMA9551_APPID_PEDOMETER,
465 reg, tmp);
466 mutex_unlock(&data->mutex);
467 return ret;
468 }
469
470 static int mma9553_read_raw(struct iio_dev *indio_dev,
471 struct iio_chan_spec const *chan,
472 int *val, int *val2, long mask)
473 {
474 struct mma9553_data *data = iio_priv(indio_dev);
475 int ret;
476 u16 tmp;
477 u8 activity;
478
479 switch (mask) {
480 case IIO_CHAN_INFO_PROCESSED:
481 switch (chan->type) {
482 case IIO_STEPS:
483 ret = mma9553_read_status_word(data,
484 MMA9553_REG_STEPCNT,
485 &tmp);
486 if (ret < 0)
487 return ret;
488 *val = tmp;
489 return IIO_VAL_INT;
490 case IIO_DISTANCE:
491 ret = mma9553_read_status_word(data,
492 MMA9553_REG_DISTANCE,
493 &tmp);
494 if (ret < 0)
495 return ret;
496 *val = tmp;
497 return IIO_VAL_INT;
498 case IIO_ACTIVITY:
499 ret = mma9553_read_status_word(data,
500 MMA9553_REG_STATUS,
501 &tmp);
502 if (ret < 0)
503 return ret;
504
505 activity =
506 mma9553_get_bits(tmp, MMA9553_MASK_STATUS_ACTIVITY);
507
508 /*
509 * The device does not support confidence value levels,
510 * so we will always have 100% for current activity and
511 * 0% for the others.
512 */
513 if (chan->channel2 == mma9553_activity_to_mod(activity))
514 *val = 100;
515 else
516 *val = 0;
517 return IIO_VAL_INT;
518 default:
519 return -EINVAL;
520 }
521 case IIO_CHAN_INFO_RAW:
522 switch (chan->type) {
523 case IIO_VELOCITY: /* m/h */
524 if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
525 return -EINVAL;
526 ret = mma9553_read_status_word(data,
527 MMA9553_REG_SPEED,
528 &tmp);
529 if (ret < 0)
530 return ret;
531 *val = tmp;
532 return IIO_VAL_INT;
533 case IIO_ENERGY: /* Cal or kcal */
534 ret = mma9553_read_status_word(data,
535 MMA9553_REG_CALORIES,
536 &tmp);
537 if (ret < 0)
538 return ret;
539 *val = tmp;
540 return IIO_VAL_INT;
541 case IIO_ACCEL:
542 mutex_lock(&data->mutex);
543 ret = mma9551_read_accel_chan(data->client,
544 chan, val, val2);
545 mutex_unlock(&data->mutex);
546 return ret;
547 default:
548 return -EINVAL;
549 }
550 case IIO_CHAN_INFO_SCALE:
551 switch (chan->type) {
552 case IIO_VELOCITY: /* m/h to m/s */
553 if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
554 return -EINVAL;
555 *val = 0;
556 *val2 = 277; /* 0.000277 */
557 return IIO_VAL_INT_PLUS_MICRO;
558 case IIO_ENERGY: /* Cal or kcal to J */
559 *val = 4184;
560 return IIO_VAL_INT;
561 case IIO_ACCEL:
562 return mma9551_read_accel_scale(val, val2);
563 default:
564 return -EINVAL;
565 }
566 case IIO_CHAN_INFO_ENABLE:
567 *val = data->stepcnt_enabled;
568 return IIO_VAL_INT;
569 case IIO_CHAN_INFO_CALIBHEIGHT:
570 tmp = mma9553_get_bits(data->conf.height_weight,
571 MMA9553_MASK_CONF_HEIGHT);
572 *val = tmp / 100; /* cm to m */
573 *val2 = (tmp % 100) * 10000;
574 return IIO_VAL_INT_PLUS_MICRO;
575 case IIO_CHAN_INFO_CALIBWEIGHT:
576 *val = mma9553_get_bits(data->conf.height_weight,
577 MMA9553_MASK_CONF_WEIGHT);
578 return IIO_VAL_INT;
579 case IIO_CHAN_INFO_DEBOUNCE_COUNT:
580 switch (chan->type) {
581 case IIO_STEPS:
582 *val = mma9553_get_bits(data->conf.filter,
583 MMA9553_MASK_CONF_FILTSTEP);
584 return IIO_VAL_INT;
585 default:
586 return -EINVAL;
587 }
588 case IIO_CHAN_INFO_DEBOUNCE_TIME:
589 switch (chan->type) {
590 case IIO_STEPS:
591 *val = mma9553_get_bits(data->conf.filter,
592 MMA9553_MASK_CONF_FILTTIME);
593 return IIO_VAL_INT;
594 default:
595 return -EINVAL;
596 }
597 case IIO_CHAN_INFO_INT_TIME:
598 switch (chan->type) {
599 case IIO_VELOCITY:
600 if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
601 return -EINVAL;
602 *val = mma9553_get_bits(data->conf.speed_step,
603 MMA9553_MASK_CONF_SPDPRD);
604 return IIO_VAL_INT;
605 default:
606 return -EINVAL;
607 }
608 default:
609 return -EINVAL;
610 }
611 }
612
613 static int mma9553_write_raw(struct iio_dev *indio_dev,
614 struct iio_chan_spec const *chan,
615 int val, int val2, long mask)
616 {
617 struct mma9553_data *data = iio_priv(indio_dev);
618 int ret, tmp;
619
620 switch (mask) {
621 case IIO_CHAN_INFO_ENABLE:
622 if (data->stepcnt_enabled == !!val)
623 return 0;
624 mutex_lock(&data->mutex);
625 ret = mma9551_set_power_state(data->client, val);
626 if (ret < 0) {
627 mutex_unlock(&data->mutex);
628 return ret;
629 }
630 data->stepcnt_enabled = val;
631 mutex_unlock(&data->mutex);
632 return 0;
633 case IIO_CHAN_INFO_CALIBHEIGHT:
634 /* m to cm */
635 tmp = val * 100 + val2 / 10000;
636 if (tmp < 0 || tmp > 255)
637 return -EINVAL;
638 mutex_lock(&data->mutex);
639 ret = mma9553_set_config(data,
640 MMA9553_REG_CONF_HEIGHT_WEIGHT,
641 &data->conf.height_weight,
642 tmp, MMA9553_MASK_CONF_HEIGHT);
643 mutex_unlock(&data->mutex);
644 return ret;
645 case IIO_CHAN_INFO_CALIBWEIGHT:
646 if (val < 0 || val > 255)
647 return -EINVAL;
648 mutex_lock(&data->mutex);
649 ret = mma9553_set_config(data,
650 MMA9553_REG_CONF_HEIGHT_WEIGHT,
651 &data->conf.height_weight,
652 val, MMA9553_MASK_CONF_WEIGHT);
653 mutex_unlock(&data->mutex);
654 return ret;
655 case IIO_CHAN_INFO_DEBOUNCE_COUNT:
656 switch (chan->type) {
657 case IIO_STEPS:
658 /*
659 * Set to 0 to disable step filtering. If the value
660 * specified is greater than 6, then 6 will be used.
661 */
662 if (val < 0)
663 return -EINVAL;
664 if (val > 6)
665 val = 6;
666 mutex_lock(&data->mutex);
667 ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
668 &data->conf.filter, val,
669 MMA9553_MASK_CONF_FILTSTEP);
670 mutex_unlock(&data->mutex);
671 return ret;
672 default:
673 return -EINVAL;
674 }
675 case IIO_CHAN_INFO_DEBOUNCE_TIME:
676 switch (chan->type) {
677 case IIO_STEPS:
678 if (val < 0 || val > 127)
679 return -EINVAL;
680 mutex_lock(&data->mutex);
681 ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
682 &data->conf.filter, val,
683 MMA9553_MASK_CONF_FILTTIME);
684 mutex_unlock(&data->mutex);
685 return ret;
686 default:
687 return -EINVAL;
688 }
689 case IIO_CHAN_INFO_INT_TIME:
690 switch (chan->type) {
691 case IIO_VELOCITY:
692 if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
693 return -EINVAL;
694 /*
695 * If set to a value greater than 5, then 5 will be
696 * used. Warning: Do not set SPDPRD to 0 or 1 as
697 * this may cause undesirable behavior.
698 */
699 if (val < 2)
700 return -EINVAL;
701 if (val > 5)
702 val = 5;
703 mutex_lock(&data->mutex);
704 ret = mma9553_set_config(data,
705 MMA9553_REG_CONF_SPEED_STEP,
706 &data->conf.speed_step, val,
707 MMA9553_MASK_CONF_SPDPRD);
708 mutex_unlock(&data->mutex);
709 return ret;
710 default:
711 return -EINVAL;
712 }
713 default:
714 return -EINVAL;
715 }
716 }
717
718 static int mma9553_read_event_config(struct iio_dev *indio_dev,
719 const struct iio_chan_spec *chan,
720 enum iio_event_type type,
721 enum iio_event_direction dir)
722 {
723 struct mma9553_data *data = iio_priv(indio_dev);
724 struct mma9553_event *event;
725
726 event = mma9553_get_event(data, chan->type, chan->channel2, dir);
727 if (!event)
728 return -EINVAL;
729
730 return event->enabled;
731 }
732
733 static int mma9553_write_event_config(struct iio_dev *indio_dev,
734 const struct iio_chan_spec *chan,
735 enum iio_event_type type,
736 enum iio_event_direction dir, int state)
737 {
738 struct mma9553_data *data = iio_priv(indio_dev);
739 struct mma9553_event *event;
740 int ret;
741
742 event = mma9553_get_event(data, chan->type, chan->channel2, dir);
743 if (!event)
744 return -EINVAL;
745
746 if (event->enabled == state)
747 return 0;
748
749 mutex_lock(&data->mutex);
750
751 ret = mma9551_set_power_state(data->client, state);
752 if (ret < 0)
753 goto err_out;
754 event->enabled = state;
755
756 ret = mma9553_conf_gpio(data);
757 if (ret < 0)
758 goto err_conf_gpio;
759
760 mutex_unlock(&data->mutex);
761
762 return 0;
763
764 err_conf_gpio:
765 if (state) {
766 event->enabled = false;
767 mma9551_set_power_state(data->client, false);
768 }
769 err_out:
770 mutex_unlock(&data->mutex);
771 return ret;
772 }
773
774 static int mma9553_read_event_value(struct iio_dev *indio_dev,
775 const struct iio_chan_spec *chan,
776 enum iio_event_type type,
777 enum iio_event_direction dir,
778 enum iio_event_info info,
779 int *val, int *val2)
780 {
781 struct mma9553_data *data = iio_priv(indio_dev);
782
783 *val2 = 0;
784 switch (info) {
785 case IIO_EV_INFO_VALUE:
786 switch (chan->type) {
787 case IIO_STEPS:
788 *val = mma9553_get_bits(data->conf.speed_step,
789 MMA9553_MASK_CONF_STEPCOALESCE);
790 return IIO_VAL_INT;
791 case IIO_ACTIVITY:
792 /*
793 * The device does not support confidence value levels.
794 * We set an average of 50%.
795 */
796 *val = 50;
797 return IIO_VAL_INT;
798 default:
799 return -EINVAL;
800 }
801 case IIO_EV_INFO_PERIOD:
802 switch (chan->type) {
803 case IIO_ACTIVITY:
804 *val = MMA9553_ACTIVITY_THD_TO_SEC(data->conf.actthd);
805 return IIO_VAL_INT;
806 default:
807 return -EINVAL;
808 }
809 default:
810 return -EINVAL;
811 }
812 }
813
814 static int mma9553_write_event_value(struct iio_dev *indio_dev,
815 const struct iio_chan_spec *chan,
816 enum iio_event_type type,
817 enum iio_event_direction dir,
818 enum iio_event_info info,
819 int val, int val2)
820 {
821 struct mma9553_data *data = iio_priv(indio_dev);
822 int ret;
823
824 switch (info) {
825 case IIO_EV_INFO_VALUE:
826 switch (chan->type) {
827 case IIO_STEPS:
828 if (val < 0 || val > 255)
829 return -EINVAL;
830 mutex_lock(&data->mutex);
831 ret = mma9553_set_config(data,
832 MMA9553_REG_CONF_SPEED_STEP,
833 &data->conf.speed_step, val,
834 MMA9553_MASK_CONF_STEPCOALESCE);
835 mutex_unlock(&data->mutex);
836 return ret;
837 default:
838 return -EINVAL;
839 }
840 case IIO_EV_INFO_PERIOD:
841 switch (chan->type) {
842 case IIO_ACTIVITY:
843 if (val < 0 || val > MMA9553_ACTIVITY_THD_TO_SEC(
844 MMA9553_MAX_ACTTHD))
845 return -EINVAL;
846 mutex_lock(&data->mutex);
847 ret = mma9553_set_config(data, MMA9553_REG_CONF_ACTTHD,
848 &data->conf.actthd,
849 MMA9553_ACTIVITY_SEC_TO_THD
850 (val), MMA9553_MASK_CONF_WORD);
851 mutex_unlock(&data->mutex);
852 return ret;
853 default:
854 return -EINVAL;
855 }
856 default:
857 return -EINVAL;
858 }
859 }
860
861 static int mma9553_get_calibgender_mode(struct iio_dev *indio_dev,
862 const struct iio_chan_spec *chan)
863 {
864 struct mma9553_data *data = iio_priv(indio_dev);
865 u8 gender;
866
867 gender = mma9553_get_bits(data->conf.filter, MMA9553_MASK_CONF_MALE);
868 /*
869 * HW expects 0 for female and 1 for male,
870 * while iio index is 0 for male and 1 for female.
871 */
872 return !gender;
873 }
874
875 static int mma9553_set_calibgender_mode(struct iio_dev *indio_dev,
876 const struct iio_chan_spec *chan,
877 unsigned int mode)
878 {
879 struct mma9553_data *data = iio_priv(indio_dev);
880 u8 gender = !mode;
881 int ret;
882
883 if ((mode != 0) && (mode != 1))
884 return -EINVAL;
885 mutex_lock(&data->mutex);
886 ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
887 &data->conf.filter, gender,
888 MMA9553_MASK_CONF_MALE);
889 mutex_unlock(&data->mutex);
890
891 return ret;
892 }
893
894 static const struct iio_event_spec mma9553_step_event = {
895 .type = IIO_EV_TYPE_CHANGE,
896 .dir = IIO_EV_DIR_NONE,
897 .mask_separate = BIT(IIO_EV_INFO_ENABLE) | BIT(IIO_EV_INFO_VALUE),
898 };
899
900 static const struct iio_event_spec mma9553_activity_events[] = {
901 {
902 .type = IIO_EV_TYPE_THRESH,
903 .dir = IIO_EV_DIR_RISING,
904 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
905 BIT(IIO_EV_INFO_VALUE) |
906 BIT(IIO_EV_INFO_PERIOD),
907 },
908 {
909 .type = IIO_EV_TYPE_THRESH,
910 .dir = IIO_EV_DIR_FALLING,
911 .mask_separate = BIT(IIO_EV_INFO_ENABLE) |
912 BIT(IIO_EV_INFO_VALUE) |
913 BIT(IIO_EV_INFO_PERIOD),
914 },
915 };
916
917 static const char * const mma9553_calibgender_modes[] = { "male", "female" };
918
919 static const struct iio_enum mma9553_calibgender_enum = {
920 .items = mma9553_calibgender_modes,
921 .num_items = ARRAY_SIZE(mma9553_calibgender_modes),
922 .get = mma9553_get_calibgender_mode,
923 .set = mma9553_set_calibgender_mode,
924 };
925
926 static const struct iio_chan_spec_ext_info mma9553_ext_info[] = {
927 IIO_ENUM("calibgender", IIO_SHARED_BY_TYPE, &mma9553_calibgender_enum),
928 IIO_ENUM_AVAILABLE("calibgender", &mma9553_calibgender_enum),
929 {},
930 };
931
932 #define MMA9553_PEDOMETER_CHANNEL(_type, _mask) { \
933 .type = _type, \
934 .info_mask_separate = BIT(IIO_CHAN_INFO_ENABLE) | \
935 BIT(IIO_CHAN_INFO_CALIBHEIGHT) | \
936 _mask, \
937 .ext_info = mma9553_ext_info, \
938 }
939
940 #define MMA9553_ACTIVITY_CHANNEL(_chan2) { \
941 .type = IIO_ACTIVITY, \
942 .modified = 1, \
943 .channel2 = _chan2, \
944 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
945 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT) | \
946 BIT(IIO_CHAN_INFO_ENABLE), \
947 .event_spec = mma9553_activity_events, \
948 .num_event_specs = ARRAY_SIZE(mma9553_activity_events), \
949 .ext_info = mma9553_ext_info, \
950 }
951
952 static const struct iio_chan_spec mma9553_channels[] = {
953 MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
954 MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
955 MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
956
957 {
958 .type = IIO_STEPS,
959 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
960 BIT(IIO_CHAN_INFO_ENABLE) |
961 BIT(IIO_CHAN_INFO_DEBOUNCE_COUNT) |
962 BIT(IIO_CHAN_INFO_DEBOUNCE_TIME),
963 .event_spec = &mma9553_step_event,
964 .num_event_specs = 1,
965 },
966
967 MMA9553_PEDOMETER_CHANNEL(IIO_DISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
968 {
969 .type = IIO_VELOCITY,
970 .modified = 1,
971 .channel2 = IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
972 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
973 BIT(IIO_CHAN_INFO_SCALE) |
974 BIT(IIO_CHAN_INFO_INT_TIME) |
975 BIT(IIO_CHAN_INFO_ENABLE),
976 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBHEIGHT),
977 .ext_info = mma9553_ext_info,
978 },
979 MMA9553_PEDOMETER_CHANNEL(IIO_ENERGY, BIT(IIO_CHAN_INFO_RAW) |
980 BIT(IIO_CHAN_INFO_SCALE) |
981 BIT(IIO_CHAN_INFO_CALIBWEIGHT)),
982
983 MMA9553_ACTIVITY_CHANNEL(IIO_MOD_RUNNING),
984 MMA9553_ACTIVITY_CHANNEL(IIO_MOD_JOGGING),
985 MMA9553_ACTIVITY_CHANNEL(IIO_MOD_WALKING),
986 MMA9553_ACTIVITY_CHANNEL(IIO_MOD_STILL),
987 };
988
989 static const struct iio_info mma9553_info = {
990 .read_raw = mma9553_read_raw,
991 .write_raw = mma9553_write_raw,
992 .read_event_config = mma9553_read_event_config,
993 .write_event_config = mma9553_write_event_config,
994 .read_event_value = mma9553_read_event_value,
995 .write_event_value = mma9553_write_event_value,
996 };
997
998 static irqreturn_t mma9553_irq_handler(int irq, void *private)
999 {
1000 struct iio_dev *indio_dev = private;
1001 struct mma9553_data *data = iio_priv(indio_dev);
1002
1003 data->timestamp = iio_get_time_ns(indio_dev);
1004 /*
1005 * Since we only configure the interrupt pin when an
1006 * event is enabled, we are sure we have at least
1007 * one event enabled at this point.
1008 */
1009 return IRQ_WAKE_THREAD;
1010 }
1011
1012 static irqreturn_t mma9553_event_handler(int irq, void *private)
1013 {
1014 struct iio_dev *indio_dev = private;
1015 struct mma9553_data *data = iio_priv(indio_dev);
1016 u16 stepcnt;
1017 u8 activity;
1018 struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
1019 int ret;
1020
1021 mutex_lock(&data->mutex);
1022 ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
1023 if (ret < 0) {
1024 mutex_unlock(&data->mutex);
1025 return IRQ_HANDLED;
1026 }
1027
1028 ev_prev_activity = mma9553_get_event(data, IIO_ACTIVITY,
1029 mma9553_activity_to_mod(
1030 data->activity),
1031 IIO_EV_DIR_FALLING);
1032 ev_activity = mma9553_get_event(data, IIO_ACTIVITY,
1033 mma9553_activity_to_mod(activity),
1034 IIO_EV_DIR_RISING);
1035 ev_step_detect = mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD,
1036 IIO_EV_DIR_NONE);
1037
1038 if (ev_step_detect->enabled && (stepcnt != data->stepcnt)) {
1039 data->stepcnt = stepcnt;
1040 iio_push_event(indio_dev,
1041 IIO_EVENT_CODE(IIO_STEPS, 0, IIO_NO_MOD,
1042 IIO_EV_DIR_NONE,
1043 IIO_EV_TYPE_CHANGE, 0, 0, 0),
1044 data->timestamp);
1045 }
1046
1047 if (activity != data->activity) {
1048 data->activity = activity;
1049 /* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
1050 if (ev_prev_activity && ev_prev_activity->enabled)
1051 iio_push_event(indio_dev,
1052 IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1053 ev_prev_activity->info->mod,
1054 IIO_EV_DIR_FALLING,
1055 IIO_EV_TYPE_THRESH, 0, 0,
1056 0),
1057 data->timestamp);
1058
1059 if (ev_activity && ev_activity->enabled)
1060 iio_push_event(indio_dev,
1061 IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1062 ev_activity->info->mod,
1063 IIO_EV_DIR_RISING,
1064 IIO_EV_TYPE_THRESH, 0, 0,
1065 0),
1066 data->timestamp);
1067 }
1068 mutex_unlock(&data->mutex);
1069
1070 return IRQ_HANDLED;
1071 }
1072
1073 static const char *mma9553_match_acpi_device(struct device *dev)
1074 {
1075 const struct acpi_device_id *id;
1076
1077 id = acpi_match_device(dev->driver->acpi_match_table, dev);
1078 if (!id)
1079 return NULL;
1080
1081 return dev_name(dev);
1082 }
1083
1084 static int mma9553_probe(struct i2c_client *client,
1085 const struct i2c_device_id *id)
1086 {
1087 struct mma9553_data *data;
1088 struct iio_dev *indio_dev;
1089 const char *name = NULL;
1090 int ret;
1091
1092 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1093 if (!indio_dev)
1094 return -ENOMEM;
1095
1096 data = iio_priv(indio_dev);
1097 i2c_set_clientdata(client, indio_dev);
1098 data->client = client;
1099
1100 if (id)
1101 name = id->name;
1102 else if (ACPI_HANDLE(&client->dev))
1103 name = mma9553_match_acpi_device(&client->dev);
1104 else
1105 return -ENOSYS;
1106
1107 mutex_init(&data->mutex);
1108 mma9553_init_events(data);
1109
1110 ret = mma9553_init(data);
1111 if (ret < 0)
1112 return ret;
1113
1114 indio_dev->dev.parent = &client->dev;
1115 indio_dev->channels = mma9553_channels;
1116 indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
1117 indio_dev->name = name;
1118 indio_dev->modes = INDIO_DIRECT_MODE;
1119 indio_dev->info = &mma9553_info;
1120
1121 if (client->irq > 0) {
1122 ret = devm_request_threaded_irq(&client->dev, client->irq,
1123 mma9553_irq_handler,
1124 mma9553_event_handler,
1125 IRQF_TRIGGER_RISING,
1126 MMA9553_IRQ_NAME, indio_dev);
1127 if (ret < 0) {
1128 dev_err(&client->dev, "request irq %d failed\n",
1129 client->irq);
1130 goto out_poweroff;
1131 }
1132 }
1133
1134 ret = pm_runtime_set_active(&client->dev);
1135 if (ret < 0)
1136 goto out_poweroff;
1137
1138 pm_runtime_enable(&client->dev);
1139 pm_runtime_set_autosuspend_delay(&client->dev,
1140 MMA9551_AUTO_SUSPEND_DELAY_MS);
1141 pm_runtime_use_autosuspend(&client->dev);
1142
1143 ret = iio_device_register(indio_dev);
1144 if (ret < 0) {
1145 dev_err(&client->dev, "unable to register iio device\n");
1146 goto out_poweroff;
1147 }
1148
1149 dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
1150 return 0;
1151
1152 out_poweroff:
1153 mma9551_set_device_state(client, false);
1154 return ret;
1155 }
1156
1157 static int mma9553_remove(struct i2c_client *client)
1158 {
1159 struct iio_dev *indio_dev = i2c_get_clientdata(client);
1160 struct mma9553_data *data = iio_priv(indio_dev);
1161
1162 iio_device_unregister(indio_dev);
1163
1164 pm_runtime_disable(&client->dev);
1165 pm_runtime_set_suspended(&client->dev);
1166 pm_runtime_put_noidle(&client->dev);
1167
1168 mutex_lock(&data->mutex);
1169 mma9551_set_device_state(data->client, false);
1170 mutex_unlock(&data->mutex);
1171
1172 return 0;
1173 }
1174
1175 #ifdef CONFIG_PM
1176 static int mma9553_runtime_suspend(struct device *dev)
1177 {
1178 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1179 struct mma9553_data *data = iio_priv(indio_dev);
1180 int ret;
1181
1182 mutex_lock(&data->mutex);
1183 ret = mma9551_set_device_state(data->client, false);
1184 mutex_unlock(&data->mutex);
1185 if (ret < 0) {
1186 dev_err(&data->client->dev, "powering off device failed\n");
1187 return -EAGAIN;
1188 }
1189
1190 return 0;
1191 }
1192
1193 static int mma9553_runtime_resume(struct device *dev)
1194 {
1195 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1196 struct mma9553_data *data = iio_priv(indio_dev);
1197 int ret;
1198
1199 ret = mma9551_set_device_state(data->client, true);
1200 if (ret < 0)
1201 return ret;
1202
1203 mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
1204
1205 return 0;
1206 }
1207 #endif
1208
1209 #ifdef CONFIG_PM_SLEEP
1210 static int mma9553_suspend(struct device *dev)
1211 {
1212 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1213 struct mma9553_data *data = iio_priv(indio_dev);
1214 int ret;
1215
1216 mutex_lock(&data->mutex);
1217 ret = mma9551_set_device_state(data->client, false);
1218 mutex_unlock(&data->mutex);
1219
1220 return ret;
1221 }
1222
1223 static int mma9553_resume(struct device *dev)
1224 {
1225 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1226 struct mma9553_data *data = iio_priv(indio_dev);
1227 int ret;
1228
1229 mutex_lock(&data->mutex);
1230 ret = mma9551_set_device_state(data->client, true);
1231 mutex_unlock(&data->mutex);
1232
1233 return ret;
1234 }
1235 #endif
1236
1237 static const struct dev_pm_ops mma9553_pm_ops = {
1238 SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
1239 SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
1240 mma9553_runtime_resume, NULL)
1241 };
1242
1243 static const struct acpi_device_id mma9553_acpi_match[] = {
1244 {"MMA9553", 0},
1245 {},
1246 };
1247
1248 MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
1249
1250 static const struct i2c_device_id mma9553_id[] = {
1251 {"mma9553", 0},
1252 {},
1253 };
1254
1255 MODULE_DEVICE_TABLE(i2c, mma9553_id);
1256
1257 static struct i2c_driver mma9553_driver = {
1258 .driver = {
1259 .name = MMA9553_DRV_NAME,
1260 .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
1261 .pm = &mma9553_pm_ops,
1262 },
1263 .probe = mma9553_probe,
1264 .remove = mma9553_remove,
1265 .id_table = mma9553_id,
1266 };
1267
1268 module_i2c_driver(mma9553_driver);
1269
1270 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1271 MODULE_LICENSE("GPL v2");
1272 MODULE_DESCRIPTION("MMA9553L pedometer platform driver");
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