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/gpio/consumer.h>
  21 #include <linux/iio/iio.h>
  22 #include <linux/iio/sysfs.h>
  23 #include <linux/iio/events.h>
  24 #include <linux/pm_runtime.h>
  25 #include "mma9551_core.h"
  26
  27 #define MMA9553_DRV_NAME                        "mma9553"
  28 #define MMA9553_IRQ_NAME                        "mma9553_event"
  29 #define MMA9553_GPIO_NAME                       "mma9553_int"
  30
  31 /* Pedometer configuration registers (R/W) */
  32 #define MMA9553_REG_CONF_SLEEPMIN               0x00
  33 #define MMA9553_REG_CONF_SLEEPMAX               0x02
  34 #define MMA9553_REG_CONF_SLEEPTHD               0x04
  35 #define MMA9553_MASK_CONF_WORD                  GENMASK(15, 0)
  36
  37 #define MMA9553_REG_CONF_CONF_STEPLEN           0x06
  38 #define MMA9553_MASK_CONF_CONFIG                BIT(15)
  39 #define MMA9553_MASK_CONF_ACT_DBCNTM            BIT(14)
  40 #define MMA9553_MASK_CONF_SLP_DBCNTM            BIT(13)
  41 #define MMA9553_MASK_CONF_STEPLEN               GENMASK(7, 0)
  42
  43 #define MMA9553_REG_CONF_HEIGHT_WEIGHT          0x08
  44 #define MMA9553_MASK_CONF_HEIGHT                GENMASK(15, 8)
  45 #define MMA9553_MASK_CONF_WEIGHT                GENMASK(7, 0)
  46
  47 #define MMA9553_REG_CONF_FILTER                 0x0A
  48 #define MMA9553_MASK_CONF_FILTSTEP              GENMASK(15, 8)
  49 #define MMA9553_MASK_CONF_MALE                  BIT(7)
  50 #define MMA9553_MASK_CONF_FILTTIME              GENMASK(6, 0)
  51
  52 #define MMA9553_REG_CONF_SPEED_STEP             0x0C
  53 #define MMA9553_MASK_CONF_SPDPRD                GENMASK(15, 8)
  54 #define MMA9553_MASK_CONF_STEPCOALESCE          GENMASK(7, 0)
  55
  56 #define MMA9553_REG_CONF_ACTTHD                 0x0E
  57 #define MMA9553_MAX_ACTTHD                      GENMASK(15, 0)
  58
  59 /* Pedometer status registers (R-only) */
  60 #define MMA9553_REG_STATUS                      0x00
  61 #define MMA9553_MASK_STATUS_MRGFL               BIT(15)
  62 #define MMA9553_MASK_STATUS_SUSPCHG             BIT(14)
  63 #define MMA9553_MASK_STATUS_STEPCHG             BIT(13)
  64 #define MMA9553_MASK_STATUS_ACTCHG              BIT(12)
  65 #define MMA9553_MASK_STATUS_SUSP                BIT(11)
  66 #define MMA9553_MASK_STATUS_ACTIVITY            GENMASK(10, 8)
  67 #define MMA9553_MASK_STATUS_VERSION             GENMASK(7, 0)
  68
  69 #define MMA9553_REG_STEPCNT                     0x02
  70 #define MMA9553_REG_DISTANCE                    0x04
  71 #define MMA9553_REG_SPEED                       0x06
  72 #define MMA9553_REG_CALORIES                    0x08
  73 #define MMA9553_REG_SLEEPCNT                    0x0A
  74
  75 /* Pedometer events are always mapped to this pin. */
  76 #define MMA9553_DEFAULT_GPIO_PIN        mma9551_gpio6
  77 #define MMA9553_DEFAULT_GPIO_POLARITY   0
  78
  79 /* Bitnum used for GPIO configuration = bit number in high status byte */
  80 #define MMA9553_STATUS_TO_BITNUM(bit)   (ffs(bit) - 9)
  81 #define MMA9553_MAX_BITNUM              MMA9553_STATUS_TO_BITNUM(BIT(16))
  82
  83 #define MMA9553_DEFAULT_SAMPLE_RATE     30      /* Hz */
  84
  85 /*
  86  * The internal activity level must be stable for ACTTHD samples before
  87  * ACTIVITY is updated. The ACTIVITY variable contains the current activity
  88  * level and is updated every time a step is detected or once a second
  89  * if there are no steps.
  90  */
  91 #define MMA9553_ACTIVITY_THD_TO_SEC(thd) ((thd) / MMA9553_DEFAULT_SAMPLE_RATE)
  92 #define MMA9553_ACTIVITY_SEC_TO_THD(sec) ((sec) * MMA9553_DEFAULT_SAMPLE_RATE)
  93
  94 /*
  95  * Autonomously suspend pedometer if acceleration vector magnitude
  96  * is near 1g (4096 at 0.244 mg/LSB resolution) for 30 seconds.
  97  */
  98 #define MMA9553_DEFAULT_SLEEPMIN        3688    /* 0,9 g */
  99 #define MMA9553_DEFAULT_SLEEPMAX        4508    /* 1,1 g */
 100 #define MMA9553_DEFAULT_SLEEPTHD        (MMA9553_DEFAULT_SAMPLE_RATE * 30)
 101
 102 #define MMA9553_CONFIG_RETRIES          2
 103
 104 /* Status register - activity field  */
 105 enum activity_level {
 106         ACTIVITY_UNKNOWN,
 107         ACTIVITY_REST,
 108         ACTIVITY_WALKING,
 109         ACTIVITY_JOGGING,
 110         ACTIVITY_RUNNING,
 111 };
 112
 113 static struct mma9553_event_info {
 114         enum iio_chan_type type;
 115         enum iio_modifier mod;
 116         enum iio_event_direction dir;
 117 } mma9553_events_info[] = {
 118         {
 119                 .type = IIO_STEPS,
 120                 .mod = IIO_NO_MOD,
 121                 .dir = IIO_EV_DIR_NONE,
 122         },
 123         {
 124                 .type = IIO_ACTIVITY,
 125                 .mod = IIO_MOD_STILL,
 126                 .dir = IIO_EV_DIR_RISING,
 127         },
 128         {
 129                 .type = IIO_ACTIVITY,
 130                 .mod = IIO_MOD_STILL,
 131                 .dir = IIO_EV_DIR_FALLING,
 132         },
 133         {
 134                 .type = IIO_ACTIVITY,
 135                 .mod = IIO_MOD_WALKING,
 136                 .dir = IIO_EV_DIR_RISING,
 137         },
 138         {
 139                 .type = IIO_ACTIVITY,
 140                 .mod = IIO_MOD_WALKING,
 141                 .dir = IIO_EV_DIR_FALLING,
 142         },
 143         {
 144                 .type = IIO_ACTIVITY,
 145                 .mod = IIO_MOD_JOGGING,
 146                 .dir = IIO_EV_DIR_RISING,
 147         },
 148         {
 149                 .type = IIO_ACTIVITY,
 150                 .mod = IIO_MOD_JOGGING,
 151                 .dir = IIO_EV_DIR_FALLING,
 152         },
 153         {
 154                 .type = IIO_ACTIVITY,
 155                 .mod = IIO_MOD_RUNNING,
 156                 .dir = IIO_EV_DIR_RISING,
 157         },
 158         {
 159                 .type = IIO_ACTIVITY,
 160                 .mod = IIO_MOD_RUNNING,
 161                 .dir = IIO_EV_DIR_FALLING,
 162         },
 163 };
 164
 165 #define MMA9553_EVENTS_INFO_SIZE ARRAY_SIZE(mma9553_events_info)
 166
 167 struct mma9553_event {
 168         struct mma9553_event_info *info;
 169         bool enabled;
 170 };
 171
 172 struct mma9553_conf_regs {
 173         u16 sleepmin;
 174         u16 sleepmax;
 175         u16 sleepthd;
 176         u16 config;
 177         u16 height_weight;
 178         u16 filter;
 179         u16 speed_step;
 180         u16 actthd;
 181 } __packed;
 182
 183 struct mma9553_data {
 184         struct i2c_client *client;
 185         struct mutex mutex;
 186         struct mma9553_conf_regs conf;
 187         struct mma9553_event events[MMA9553_EVENTS_INFO_SIZE];
 188         int num_events;
 189         u8 gpio_bitnum;
 190         /*
 191          * This is used for all features that depend on step count:
 192          * step count, distance, speed, calories.
 193          */
 194         bool stepcnt_enabled;
 195         u16 stepcnt;
 196         u8 activity;
 197         s64 timestamp;
 198 };
 199
 200 static u8 mma9553_get_bits(u16 val, u16 mask)
 201 {
 202         return (val & mask) >> (ffs(mask) - 1);
 203 }
 204
 205 static u16 mma9553_set_bits(u16 current_val, u16 val, u16 mask)
 206 {
 207         return (current_val & ~mask) | (val << (ffs(mask) - 1));
 208 }
 209
 210 static enum iio_modifier mma9553_activity_to_mod(enum activity_level activity)
 211 {
 212         switch (activity) {
 213         case ACTIVITY_RUNNING:
 214                 return IIO_MOD_RUNNING;
 215         case ACTIVITY_JOGGING:
 216                 return IIO_MOD_JOGGING;
 217         case ACTIVITY_WALKING:
 218                 return IIO_MOD_WALKING;
 219         case ACTIVITY_REST:
 220                 return IIO_MOD_STILL;
 221         case ACTIVITY_UNKNOWN:
 222         default:
 223                 return IIO_NO_MOD;
 224         }
 225 }
 226
 227 static void mma9553_init_events(struct mma9553_data *data)
 228 {
 229         int i;
 230
 231         data->num_events = MMA9553_EVENTS_INFO_SIZE;
 232         for (i = 0; i < data->num_events; i++) {
 233                 data->events[i].info = &mma9553_events_info[i];
 234                 data->events[i].enabled = false;
 235         }
 236 }
 237
 238 static struct mma9553_event *mma9553_get_event(struct mma9553_data *data,
 239                                                enum iio_chan_type type,
 240                                                enum iio_modifier mod,
 241                                                enum iio_event_direction dir)
 242 {
 243         int i;
 244
 245         for (i = 0; i < data->num_events; i++)
 246                 if (data->events[i].info->type == type &&
 247                     data->events[i].info->mod == mod &&
 248                     data->events[i].info->dir == dir)
 249                         return &data->events[i];
 250
 251         return NULL;
 252 }
 253
 254 static bool mma9553_is_any_event_enabled(struct mma9553_data *data,
 255                                          bool check_type,
 256                                          enum iio_chan_type type)
 257 {
 258         int i;
 259
 260         for (i = 0; i < data->num_events; i++)
 261                 if ((check_type && data->events[i].info->type == type &&
 262                      data->events[i].enabled) ||
 263                      (!check_type && data->events[i].enabled))
 264                         return true;
 265
 266         return false;
 267 }
 268
 269 static int mma9553_set_config(struct mma9553_data *data, u16 reg,
 270                               u16 *p_reg_val, u16 val, u16 mask)
 271 {
 272         int ret, retries;
 273         u16 reg_val, config;
 274
 275         reg_val = *p_reg_val;
 276         if (val == mma9553_get_bits(reg_val, mask))
 277                 return 0;
 278
 279         reg_val = mma9553_set_bits(reg_val, val, mask);
 280         ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
 281                                         reg, reg_val);
 282         if (ret < 0) {
 283                 dev_err(&data->client->dev,
 284                         "error writing config register 0x%x\n", reg);
 285                 return ret;
 286         }
 287
 288         *p_reg_val = reg_val;
 289
 290         /* Reinitializes the pedometer with current configuration values */
 291         config = mma9553_set_bits(data->conf.config, 1,
 292                                   MMA9553_MASK_CONF_CONFIG);
 293
 294         ret = mma9551_write_config_word(data->client, MMA9551_APPID_PEDOMETER,
 295                                         MMA9553_REG_CONF_CONF_STEPLEN, config);
 296         if (ret < 0) {
 297                 dev_err(&data->client->dev,
 298                         "error writing config register 0x%x\n",
 299                         MMA9553_REG_CONF_CONF_STEPLEN);
 300                 return ret;
 301         }
 302
 303         retries = MMA9553_CONFIG_RETRIES;
 304         do {
 305                 mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
 306                 ret = mma9551_read_config_word(data->client,
 307                                                MMA9551_APPID_PEDOMETER,
 308                                                MMA9553_REG_CONF_CONF_STEPLEN,
 309                                                &config);
 310                 if (ret < 0)
 311                         return ret;
 312         } while (mma9553_get_bits(config, MMA9553_MASK_CONF_CONFIG) &&
 313                  --retries > 0);
 314
 315         return 0;
 316 }
 317
 318 static int mma9553_read_activity_stepcnt(struct mma9553_data *data,
 319                                          u8 *activity, u16 *stepcnt)
 320 {
 321         u16 buf[2];
 322         int ret;
 323
 324         ret = mma9551_read_status_words(data->client, MMA9551_APPID_PEDOMETER,
 325                                         MMA9553_REG_STATUS, sizeof(u32), buf);
 326         if (ret < 0) {
 327                 dev_err(&data->client->dev,
 328                         "error reading status and stepcnt\n");
 329                 return ret;
 330         }
 331
 332         *activity = mma9553_get_bits(buf[0], MMA9553_MASK_STATUS_ACTIVITY);
 333         *stepcnt = buf[1];
 334
 335         return 0;
 336 }
 337
 338 static int mma9553_conf_gpio(struct mma9553_data *data)
 339 {
 340         u8 bitnum = 0, appid = MMA9551_APPID_PEDOMETER;
 341         int ret;
 342         struct mma9553_event *ev_step_detect;
 343         bool activity_enabled;
 344
 345         activity_enabled =
 346             mma9553_is_any_event_enabled(data, true, IIO_ACTIVITY);
 347         ev_step_detect =
 348             mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD, IIO_EV_DIR_NONE);
 349
 350         /*
 351          * If both step detector and activity are enabled, use the MRGFL bit.
 352          * This bit is the logical OR of the SUSPCHG, STEPCHG, and ACTCHG flags.
 353          */
 354         if (activity_enabled && ev_step_detect->enabled)
 355                 bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_MRGFL);
 356         else if (ev_step_detect->enabled)
 357                 bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_STEPCHG);
 358         else if (activity_enabled)
 359                 bitnum = MMA9553_STATUS_TO_BITNUM(MMA9553_MASK_STATUS_ACTCHG);
 360         else                    /* Reset */
 361                 appid = MMA9551_APPID_NONE;
 362
 363         if (data->gpio_bitnum == bitnum)
 364                 return 0;
 365
 366         /* Save initial values for activity and stepcnt */
 367         if (activity_enabled || ev_step_detect->enabled) {
 368                 ret = mma9553_read_activity_stepcnt(data, &data->activity,
 369                                                     &data->stepcnt);
 370                 if (ret < 0)
 371                         return ret;
 372         }
 373
 374         ret = mma9551_gpio_config(data->client,
 375                                   MMA9553_DEFAULT_GPIO_PIN,
 376                                   appid, bitnum, MMA9553_DEFAULT_GPIO_POLARITY);
 377         if (ret < 0)
 378                 return ret;
 379         data->gpio_bitnum = bitnum;
 380
 381         return 0;
 382 }
 383
 384 static int mma9553_init(struct mma9553_data *data)
 385 {
 386         int ret;
 387
 388         ret = mma9551_read_version(data->client);
 389         if (ret)
 390                 return ret;
 391
 392         /*
 393          * Read all the pedometer configuration registers. This is used as
 394          * a device identification command to differentiate the MMA9553L
 395          * from the MMA9550L.
 396          */
 397         ret =
 398             mma9551_read_config_words(data->client, MMA9551_APPID_PEDOMETER,
 399                                       MMA9553_REG_CONF_SLEEPMIN,
 400                                       sizeof(data->conf), (u16 *) &data->conf);
 401         if (ret < 0) {
 402                 dev_err(&data->client->dev,
 403                         "failed to read configuration registers\n");
 404                 return ret;
 405         }
 406
 407
 408         /* Reset GPIO */
 409         data->gpio_bitnum = MMA9553_MAX_BITNUM;
 410         ret = mma9553_conf_gpio(data);
 411         if (ret < 0)
 412                 return ret;
 413
 414         ret = mma9551_app_reset(data->client, MMA9551_RSC_PED);
 415         if (ret < 0)
 416                 return ret;
 417
 418         /* Init config registers */
 419         data->conf.sleepmin = MMA9553_DEFAULT_SLEEPMIN;
 420         data->conf.sleepmax = MMA9553_DEFAULT_SLEEPMAX;
 421         data->conf.sleepthd = MMA9553_DEFAULT_SLEEPTHD;
 422         data->conf.config =
 423             mma9553_set_bits(data->conf.config, 1, MMA9553_MASK_CONF_CONFIG);
 424         /*
 425          * Clear the activity debounce counter when the activity level changes,
 426          * so that the confidence level applies for any activity level.
 427          */
 428         data->conf.config = mma9553_set_bits(data->conf.config, 1,
 429                                              MMA9553_MASK_CONF_ACT_DBCNTM);
 430         ret =
 431             mma9551_write_config_words(data->client, MMA9551_APPID_PEDOMETER,
 432                                        MMA9553_REG_CONF_SLEEPMIN,
 433                                        sizeof(data->conf), (u16 *) &data->conf);
 434         if (ret < 0) {
 435                 dev_err(&data->client->dev,
 436                         "failed to write configuration registers\n");
 437                 return ret;
 438         }
 439
 440         return mma9551_set_device_state(data->client, true);
 441 }
 442
 443 static int mma9553_read_status_word(struct mma9553_data *data, u16 reg,
 444                                     u16 *tmp)
 445 {
 446         bool powered_on;
 447         int ret;
 448
 449         /*
 450          * The HW only counts steps and other dependent
 451          * parameters (speed, distance, calories, activity)
 452          * if power is on (from enabling an event or the
 453          * step counter).
 454          */
 455         powered_on = mma9553_is_any_event_enabled(data, false, 0) ||
 456                      data->stepcnt_enabled;
 457         if (!powered_on) {
 458                 dev_err(&data->client->dev, "No channels enabled\n");
 459                 return -EINVAL;
 460         }
 461
 462         mutex_lock(&data->mutex);
 463         ret = mma9551_read_status_word(data->client, MMA9551_APPID_PEDOMETER,
 464                                        reg, tmp);
 465         mutex_unlock(&data->mutex);
 466         return ret;
 467 }
 468
 469 static int mma9553_read_raw(struct iio_dev *indio_dev,
 470                             struct iio_chan_spec const *chan,
 471                             int *val, int *val2, long mask)
 472 {
 473         struct mma9553_data *data = iio_priv(indio_dev);
 474         int ret;
 475         u16 tmp;
 476         u8 activity;
 477
 478         switch (mask) {
 479         case IIO_CHAN_INFO_PROCESSED:
 480                 switch (chan->type) {
 481                 case IIO_STEPS:
 482                         ret = mma9553_read_status_word(data,
 483                                                        MMA9553_REG_STEPCNT,
 484                                                        &tmp);
 485                         if (ret < 0)
 486                                 return ret;
 487                         *val = tmp;
 488                         return IIO_VAL_INT;
 489                 case IIO_DISTANCE:
 490                         ret = mma9553_read_status_word(data,
 491                                                        MMA9553_REG_DISTANCE,
 492                                                        &tmp);
 493                         if (ret < 0)
 494                                 return ret;
 495                         *val = tmp;
 496                         return IIO_VAL_INT;
 497                 case IIO_ACTIVITY:
 498                         ret = mma9553_read_status_word(data,
 499                                                        MMA9553_REG_STATUS,
 500                                                        &tmp);
 501                         if (ret < 0)
 502                                 return ret;
 503
 504                         activity =
 505                             mma9553_get_bits(tmp, MMA9553_MASK_STATUS_ACTIVITY);
 506
 507                         /*
 508                          * The device does not support confidence value levels,
 509                          * so we will always have 100% for current activity and
 510                          * 0% for the others.
 511                          */
 512                         if (chan->channel2 == mma9553_activity_to_mod(activity))
 513                                 *val = 100;
 514                         else
 515                                 *val = 0;
 516                         return IIO_VAL_INT;
 517                 default:
 518                         return -EINVAL;
 519                 }
 520         case IIO_CHAN_INFO_RAW:
 521                 switch (chan->type) {
 522                 case IIO_VELOCITY:      /* m/h */
 523                         if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
 524                                 return -EINVAL;
 525                         ret = mma9553_read_status_word(data,
 526                                                        MMA9553_REG_SPEED,
 527                                                        &tmp);
 528                         if (ret < 0)
 529                                 return ret;
 530                         *val = tmp;
 531                         return IIO_VAL_INT;
 532                 case IIO_ENERGY:        /* Cal or kcal */
 533                         ret = mma9553_read_status_word(data,
 534                                                        MMA9553_REG_CALORIES,
 535                                                        &tmp);
 536                         if (ret < 0)
 537                                 return ret;
 538                         *val = tmp;
 539                         return IIO_VAL_INT;
 540                 case IIO_ACCEL:
 541                         mutex_lock(&data->mutex);
 542                         ret = mma9551_read_accel_chan(data->client,
 543                                                       chan, val, val2);
 544                         mutex_unlock(&data->mutex);
 545                         return ret;
 546                 default:
 547                         return -EINVAL;
 548                 }
 549         case IIO_CHAN_INFO_SCALE:
 550                 switch (chan->type) {
 551                 case IIO_VELOCITY:      /* m/h to m/s */
 552                         if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
 553                                 return -EINVAL;
 554                         *val = 0;
 555                         *val2 = 277;    /* 0.000277 */
 556                         return IIO_VAL_INT_PLUS_MICRO;
 557                 case IIO_ENERGY:        /* Cal or kcal to J */
 558                         *val = 4184;
 559                         return IIO_VAL_INT;
 560                 case IIO_ACCEL:
 561                         return mma9551_read_accel_scale(val, val2);
 562                 default:
 563                         return -EINVAL;
 564                 }
 565         case IIO_CHAN_INFO_ENABLE:
 566                 *val = data->stepcnt_enabled;
 567                 return IIO_VAL_INT;
 568         case IIO_CHAN_INFO_CALIBHEIGHT:
 569                 tmp = mma9553_get_bits(data->conf.height_weight,
 570                                         MMA9553_MASK_CONF_HEIGHT);
 571                 *val = tmp / 100;       /* cm to m */
 572                 *val2 = (tmp % 100) * 10000;
 573                 return IIO_VAL_INT_PLUS_MICRO;
 574         case IIO_CHAN_INFO_CALIBWEIGHT:
 575                 *val = mma9553_get_bits(data->conf.height_weight,
 576                                         MMA9553_MASK_CONF_WEIGHT);
 577                 return IIO_VAL_INT;
 578         case IIO_CHAN_INFO_DEBOUNCE_COUNT:
 579                 switch (chan->type) {
 580                 case IIO_STEPS:
 581                         *val = mma9553_get_bits(data->conf.filter,
 582                                                 MMA9553_MASK_CONF_FILTSTEP);
 583                         return IIO_VAL_INT;
 584                 default:
 585                         return -EINVAL;
 586                 }
 587         case IIO_CHAN_INFO_DEBOUNCE_TIME:
 588                 switch (chan->type) {
 589                 case IIO_STEPS:
 590                         *val = mma9553_get_bits(data->conf.filter,
 591                                                 MMA9553_MASK_CONF_FILTTIME);
 592                         return IIO_VAL_INT;
 593                 default:
 594                         return -EINVAL;
 595                 }
 596         case IIO_CHAN_INFO_INT_TIME:
 597                 switch (chan->type) {
 598                 case IIO_VELOCITY:
 599                         if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
 600                                 return -EINVAL;
 601                         *val = mma9553_get_bits(data->conf.speed_step,
 602                                                 MMA9553_MASK_CONF_SPDPRD);
 603                         return IIO_VAL_INT;
 604                 default:
 605                         return -EINVAL;
 606                 }
 607         default:
 608                 return -EINVAL;
 609         }
 610 }
 611
 612 static int mma9553_write_raw(struct iio_dev *indio_dev,
 613                              struct iio_chan_spec const *chan,
 614                              int val, int val2, long mask)
 615 {
 616         struct mma9553_data *data = iio_priv(indio_dev);
 617         int ret, tmp;
 618
 619         switch (mask) {
 620         case IIO_CHAN_INFO_ENABLE:
 621                 if (data->stepcnt_enabled == !!val)
 622                         return 0;
 623                 mutex_lock(&data->mutex);
 624                 ret = mma9551_set_power_state(data->client, val);
 625                 if (ret < 0) {
 626                         mutex_unlock(&data->mutex);
 627                         return ret;
 628                 }
 629                 data->stepcnt_enabled = val;
 630                 mutex_unlock(&data->mutex);
 631                 return 0;
 632         case IIO_CHAN_INFO_CALIBHEIGHT:
 633                 /* m to cm */
 634                 tmp = val * 100 + val2 / 10000;
 635                 if (tmp < 0 || tmp > 255)
 636                         return -EINVAL;
 637                 mutex_lock(&data->mutex);
 638                 ret = mma9553_set_config(data,
 639                                          MMA9553_REG_CONF_HEIGHT_WEIGHT,
 640                                          &data->conf.height_weight,
 641                                          tmp, MMA9553_MASK_CONF_HEIGHT);
 642                 mutex_unlock(&data->mutex);
 643                 return ret;
 644         case IIO_CHAN_INFO_CALIBWEIGHT:
 645                 if (val < 0 || val > 255)
 646                         return -EINVAL;
 647                 mutex_lock(&data->mutex);
 648                 ret = mma9553_set_config(data,
 649                                          MMA9553_REG_CONF_HEIGHT_WEIGHT,
 650                                          &data->conf.height_weight,
 651                                          val, MMA9553_MASK_CONF_WEIGHT);
 652                 mutex_unlock(&data->mutex);
 653                 return ret;
 654         case IIO_CHAN_INFO_DEBOUNCE_COUNT:
 655                 switch (chan->type) {
 656                 case IIO_STEPS:
 657                         /*
 658                          * Set to 0 to disable step filtering. If the value
 659                          * specified is greater than 6, then 6 will be used.
 660                          */
 661                         if (val < 0)
 662                                 return -EINVAL;
 663                         if (val > 6)
 664                                 val = 6;
 665                         mutex_lock(&data->mutex);
 666                         ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
 667                                                  &data->conf.filter, val,
 668                                                  MMA9553_MASK_CONF_FILTSTEP);
 669                         mutex_unlock(&data->mutex);
 670                         return ret;
 671                 default:
 672                         return -EINVAL;
 673                 }
 674         case IIO_CHAN_INFO_DEBOUNCE_TIME:
 675                 switch (chan->type) {
 676                 case IIO_STEPS:
 677                         if (val < 0 || val > 127)
 678                                 return -EINVAL;
 679                         mutex_lock(&data->mutex);
 680                         ret = mma9553_set_config(data, MMA9553_REG_CONF_FILTER,
 681                                                  &data->conf.filter, val,
 682                                                  MMA9553_MASK_CONF_FILTTIME);
 683                         mutex_unlock(&data->mutex);
 684                         return ret;
 685                 default:
 686                         return -EINVAL;
 687                 }
 688         case IIO_CHAN_INFO_INT_TIME:
 689                 switch (chan->type) {
 690                 case IIO_VELOCITY:
 691                         if (chan->channel2 != IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z)
 692                                 return -EINVAL;
 693                         /*
 694                          * If set to a value greater than 5, then 5 will be
 695                          * used. Warning: Do not set SPDPRD to 0 or 1 as
 696                          * this may cause undesirable behavior.
 697                          */
 698                         if (val < 2)
 699                                 return -EINVAL;
 700                         if (val > 5)
 701                                 val = 5;
 702                         mutex_lock(&data->mutex);
 703                         ret = mma9553_set_config(data,
 704                                                  MMA9553_REG_CONF_SPEED_STEP,
 705                                                  &data->conf.speed_step, val,
 706                                                  MMA9553_MASK_CONF_SPDPRD);
 707                         mutex_unlock(&data->mutex);
 708                         return ret;
 709                 default:
 710                         return -EINVAL;
 711                 }
 712         default:
 713                 return -EINVAL;
 714         }
 715 }
 716
 717 static int mma9553_read_event_config(struct iio_dev *indio_dev,
 718                                      const struct iio_chan_spec *chan,
 719                                      enum iio_event_type type,
 720                                      enum iio_event_direction dir)
 721 {
 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         .driver_module = THIS_MODULE,
 991         .read_raw = mma9553_read_raw,
 992         .write_raw = mma9553_write_raw,
 993         .read_event_config = mma9553_read_event_config,
 994         .write_event_config = mma9553_write_event_config,
 995         .read_event_value = mma9553_read_event_value,
 996         .write_event_value = mma9553_write_event_value,
 997 };
 998
 999 static irqreturn_t mma9553_irq_handler(int irq, void *private)
1000 {
1001         struct iio_dev *indio_dev = private;
1002         struct mma9553_data *data = iio_priv(indio_dev);
1003
1004         data->timestamp = iio_get_time_ns();
1005         /*
1006          * Since we only configure the interrupt pin when an
1007          * event is enabled, we are sure we have at least
1008          * one event enabled at this point.
1009          */
1010         return IRQ_WAKE_THREAD;
1011 }
1012
1013 static irqreturn_t mma9553_event_handler(int irq, void *private)
1014 {
1015         struct iio_dev *indio_dev = private;
1016         struct mma9553_data *data = iio_priv(indio_dev);
1017         u16 stepcnt;
1018         u8 activity;
1019         struct mma9553_event *ev_activity, *ev_prev_activity, *ev_step_detect;
1020         int ret;
1021
1022         mutex_lock(&data->mutex);
1023         ret = mma9553_read_activity_stepcnt(data, &activity, &stepcnt);
1024         if (ret < 0) {
1025                 mutex_unlock(&data->mutex);
1026                 return IRQ_HANDLED;
1027         }
1028
1029         ev_prev_activity =
1030             mma9553_get_event(data, IIO_ACTIVITY,
1031                               mma9553_activity_to_mod(data->activity),
1032                               IIO_EV_DIR_FALLING);
1033         ev_activity =
1034             mma9553_get_event(data, IIO_ACTIVITY,
1035                               mma9553_activity_to_mod(activity),
1036                               IIO_EV_DIR_RISING);
1037         ev_step_detect =
1038             mma9553_get_event(data, IIO_STEPS, IIO_NO_MOD, 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, IIO_EV_TYPE_CHANGE, 0, 0, 0),
1045                                data->timestamp);
1046         }
1047
1048         if (activity != data->activity) {
1049                 data->activity = activity;
1050                 /* ev_activity can be NULL if activity == ACTIVITY_UNKNOWN */
1051                 if (ev_prev_activity && ev_prev_activity->enabled)
1052                         iio_push_event(indio_dev,
1053                                        IIO_EVENT_CODE(IIO_ACTIVITY, 0,
1054                                        ev_prev_activity->info->mod,
1055                                        IIO_EV_DIR_FALLING,
1056                                        IIO_EV_TYPE_THRESH, 0, 0, 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, 0),
1065                                        data->timestamp);
1066         }
1067         mutex_unlock(&data->mutex);
1068
1069         return IRQ_HANDLED;
1070 }
1071
1072 static int mma9553_gpio_probe(struct i2c_client *client)
1073 {
1074         struct device *dev;
1075         struct gpio_desc *gpio;
1076         int ret;
1077
1078         if (!client)
1079                 return -EINVAL;
1080
1081         dev = &client->dev;
1082
1083         /* data ready GPIO interrupt pin */
1084         gpio = devm_gpiod_get_index(dev, MMA9553_GPIO_NAME, 0, GPIOD_IN);
1085         if (IS_ERR(gpio)) {
1086                 dev_err(dev, "ACPI GPIO get index failed\n");
1087                 return PTR_ERR(gpio);
1088         }
1089
1090         ret = gpiod_to_irq(gpio);
1091
1092         dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
1093
1094         return ret;
1095 }
1096
1097 static const char *mma9553_match_acpi_device(struct device *dev)
1098 {
1099         const struct acpi_device_id *id;
1100
1101         id = acpi_match_device(dev->driver->acpi_match_table, dev);
1102         if (!id)
1103                 return NULL;
1104
1105         return dev_name(dev);
1106 }
1107
1108 static int mma9553_probe(struct i2c_client *client,
1109                          const struct i2c_device_id *id)
1110 {
1111         struct mma9553_data *data;
1112         struct iio_dev *indio_dev;
1113         const char *name = NULL;
1114         int ret;
1115
1116         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
1117         if (!indio_dev)
1118                 return -ENOMEM;
1119
1120         data = iio_priv(indio_dev);
1121         i2c_set_clientdata(client, indio_dev);
1122         data->client = client;
1123
1124         if (id)
1125                 name = id->name;
1126         else if (ACPI_HANDLE(&client->dev))
1127                 name = mma9553_match_acpi_device(&client->dev);
1128         else
1129                 return -ENOSYS;
1130
1131         mutex_init(&data->mutex);
1132         mma9553_init_events(data);
1133
1134         ret = mma9553_init(data);
1135         if (ret < 0)
1136                 return ret;
1137
1138         indio_dev->dev.parent = &client->dev;
1139         indio_dev->channels = mma9553_channels;
1140         indio_dev->num_channels = ARRAY_SIZE(mma9553_channels);
1141         indio_dev->name = name;
1142         indio_dev->modes = INDIO_DIRECT_MODE;
1143         indio_dev->info = &mma9553_info;
1144
1145         if (client->irq < 0)
1146                 client->irq = mma9553_gpio_probe(client);
1147
1148         if (client->irq >= 0) {
1149                 ret = devm_request_threaded_irq(&client->dev, client->irq,
1150                                                 mma9553_irq_handler,
1151                                                 mma9553_event_handler,
1152                                                 IRQF_TRIGGER_RISING,
1153                                                 MMA9553_IRQ_NAME, indio_dev);
1154                 if (ret < 0) {
1155                         dev_err(&client->dev, "request irq %d failed\n",
1156                                 client->irq);
1157                         goto out_poweroff;
1158                 }
1159
1160         }
1161
1162         ret = iio_device_register(indio_dev);
1163         if (ret < 0) {
1164                 dev_err(&client->dev, "unable to register iio device\n");
1165                 goto out_poweroff;
1166         }
1167
1168         ret = pm_runtime_set_active(&client->dev);
1169         if (ret < 0)
1170                 goto out_iio_unregister;
1171
1172         pm_runtime_enable(&client->dev);
1173         pm_runtime_set_autosuspend_delay(&client->dev,
1174                                          MMA9551_AUTO_SUSPEND_DELAY_MS);
1175         pm_runtime_use_autosuspend(&client->dev);
1176
1177         dev_dbg(&indio_dev->dev, "Registered device %s\n", name);
1178
1179         return 0;
1180
1181 out_iio_unregister:
1182         iio_device_unregister(indio_dev);
1183 out_poweroff:
1184         mma9551_set_device_state(client, false);
1185         return ret;
1186 }
1187
1188 static int mma9553_remove(struct i2c_client *client)
1189 {
1190         struct iio_dev *indio_dev = i2c_get_clientdata(client);
1191         struct mma9553_data *data = iio_priv(indio_dev);
1192
1193         pm_runtime_disable(&client->dev);
1194         pm_runtime_set_suspended(&client->dev);
1195         pm_runtime_put_noidle(&client->dev);
1196
1197         iio_device_unregister(indio_dev);
1198         mutex_lock(&data->mutex);
1199         mma9551_set_device_state(data->client, false);
1200         mutex_unlock(&data->mutex);
1201
1202         return 0;
1203 }
1204
1205 #ifdef CONFIG_PM
1206 static int mma9553_runtime_suspend(struct device *dev)
1207 {
1208         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1209         struct mma9553_data *data = iio_priv(indio_dev);
1210         int ret;
1211
1212         mutex_lock(&data->mutex);
1213         ret = mma9551_set_device_state(data->client, false);
1214         mutex_unlock(&data->mutex);
1215         if (ret < 0) {
1216                 dev_err(&data->client->dev, "powering off device failed\n");
1217                 return -EAGAIN;
1218         }
1219
1220         return 0;
1221 }
1222
1223 static int mma9553_runtime_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         ret = mma9551_set_device_state(data->client, true);
1230         if (ret < 0)
1231                 return ret;
1232
1233         mma9551_sleep(MMA9553_DEFAULT_SAMPLE_RATE);
1234
1235         return 0;
1236 }
1237 #endif
1238
1239 #ifdef CONFIG_PM_SLEEP
1240 static int mma9553_suspend(struct device *dev)
1241 {
1242         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1243         struct mma9553_data *data = iio_priv(indio_dev);
1244         int ret;
1245
1246         mutex_lock(&data->mutex);
1247         ret = mma9551_set_device_state(data->client, false);
1248         mutex_unlock(&data->mutex);
1249
1250         return ret;
1251 }
1252
1253 static int mma9553_resume(struct device *dev)
1254 {
1255         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
1256         struct mma9553_data *data = iio_priv(indio_dev);
1257         int ret;
1258
1259         mutex_lock(&data->mutex);
1260         ret = mma9551_set_device_state(data->client, true);
1261         mutex_unlock(&data->mutex);
1262
1263         return ret;
1264 }
1265 #endif
1266
1267 static const struct dev_pm_ops mma9553_pm_ops = {
1268         SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
1269         SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
1270                            mma9553_runtime_resume, NULL)
1271 };
1272
1273 static const struct acpi_device_id mma9553_acpi_match[] = {
1274         {"MMA9553", 0},
1275         {},
1276 };
1277
1278 MODULE_DEVICE_TABLE(acpi, mma9553_acpi_match);
1279
1280 static const struct i2c_device_id mma9553_id[] = {
1281         {"mma9553", 0},
1282         {},
1283 };
1284
1285 MODULE_DEVICE_TABLE(i2c, mma9553_id);
1286
1287 static struct i2c_driver mma9553_driver = {
1288         .driver = {
1289                    .name = MMA9553_DRV_NAME,
1290                    .acpi_match_table = ACPI_PTR(mma9553_acpi_match),
1291                    .pm = &mma9553_pm_ops,
1292                    },
1293         .probe = mma9553_probe,
1294         .remove = mma9553_remove,
1295         .id_table = mma9553_id,
1296 };
1297
1298 module_i2c_driver(mma9553_driver);
1299
1300 MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
1301 MODULE_LICENSE("GPL v2");
1302 MODULE_DESCRIPTION("MMA9553L pedometer platform driver");