drivers/iio/imu/inv_icm42600/inv_icm42600_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2020 Invensense, Inc.
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/device.h>
   8 #include <linux/module.h>
   9 #include <linux/slab.h>
  10 #include <linux/delay.h>
  11 #include <linux/mutex.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/irq.h>
  14 #include <linux/regulator/consumer.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/property.h>
  17 #include <linux/regmap.h>
  18 #include <linux/iio/iio.h>
  19
  20 #include "inv_icm42600.h"
  21 #include "inv_icm42600_buffer.h"
  22 #include "inv_icm42600_timestamp.h"
  23
  24 static const struct regmap_range_cfg inv_icm42600_regmap_ranges[] = {
  25         {
  26                 .name = "user banks",
  27                 .range_min = 0x0000,
  28                 .range_max = 0x4FFF,
  29                 .selector_reg = INV_ICM42600_REG_BANK_SEL,
  30                 .selector_mask = INV_ICM42600_BANK_SEL_MASK,
  31                 .selector_shift = 0,
  32                 .window_start = 0,
  33                 .window_len = 0x1000,
  34         },
  35 };
  36
  37 const struct regmap_config inv_icm42600_regmap_config = {
  38         .reg_bits = 8,
  39         .val_bits = 8,
  40         .max_register = 0x4FFF,
  41         .ranges = inv_icm42600_regmap_ranges,
  42         .num_ranges = ARRAY_SIZE(inv_icm42600_regmap_ranges),
  43 };
  44 EXPORT_SYMBOL_NS_GPL(inv_icm42600_regmap_config, IIO_ICM42600);
  45
  46 struct inv_icm42600_hw {
  47         uint8_t whoami;
  48         const char *name;
  49         const struct inv_icm42600_conf *conf;
  50 };
  51
  52 /* chip initial default configuration */
  53 static const struct inv_icm42600_conf inv_icm42600_default_conf = {
  54         .gyro = {
  55                 .mode = INV_ICM42600_SENSOR_MODE_OFF,
  56                 .fs = INV_ICM42600_GYRO_FS_2000DPS,
  57                 .odr = INV_ICM42600_ODR_50HZ,
  58                 .filter = INV_ICM42600_FILTER_BW_ODR_DIV_2,
  59         },
  60         .accel = {
  61                 .mode = INV_ICM42600_SENSOR_MODE_OFF,
  62                 .fs = INV_ICM42600_ACCEL_FS_16G,
  63                 .odr = INV_ICM42600_ODR_50HZ,
  64                 .filter = INV_ICM42600_FILTER_BW_ODR_DIV_2,
  65         },
  66         .temp_en = false,
  67 };
  68
  69 static const struct inv_icm42600_hw inv_icm42600_hw[INV_CHIP_NB] = {
  70         [INV_CHIP_ICM42600] = {
  71                 .whoami = INV_ICM42600_WHOAMI_ICM42600,
  72                 .name = "icm42600",
  73                 .conf = &inv_icm42600_default_conf,
  74         },
  75         [INV_CHIP_ICM42602] = {
  76                 .whoami = INV_ICM42600_WHOAMI_ICM42602,
  77                 .name = "icm42602",
  78                 .conf = &inv_icm42600_default_conf,
  79         },
  80         [INV_CHIP_ICM42605] = {
  81                 .whoami = INV_ICM42600_WHOAMI_ICM42605,
  82                 .name = "icm42605",
  83                 .conf = &inv_icm42600_default_conf,
  84         },
  85         [INV_CHIP_ICM42622] = {
  86                 .whoami = INV_ICM42600_WHOAMI_ICM42622,
  87                 .name = "icm42622",
  88                 .conf = &inv_icm42600_default_conf,
  89         },
  90         [INV_CHIP_ICM42631] = {
  91                 .whoami = INV_ICM42600_WHOAMI_ICM42631,
  92                 .name = "icm42631",
  93                 .conf = &inv_icm42600_default_conf,
  94         },
  95 };
  96
  97 const struct iio_mount_matrix *
  98 inv_icm42600_get_mount_matrix(const struct iio_dev *indio_dev,
  99                               const struct iio_chan_spec *chan)
 100 {
 101         const struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);
 102
 103         return &st->orientation;
 104 }
 105
 106 uint32_t inv_icm42600_odr_to_period(enum inv_icm42600_odr odr)
 107 {
 108         static uint32_t odr_periods[INV_ICM42600_ODR_NB] = {
 109                 /* reserved values */
 110                 0, 0, 0,
 111                 /* 8kHz */
 112                 125000,
 113                 /* 4kHz */
 114                 250000,
 115                 /* 2kHz */
 116                 500000,
 117                 /* 1kHz */
 118                 1000000,
 119                 /* 200Hz */
 120                 5000000,
 121                 /* 100Hz */
 122                 10000000,
 123                 /* 50Hz */
 124                 20000000,
 125                 /* 25Hz */
 126                 40000000,
 127                 /* 12.5Hz */
 128                 80000000,
 129                 /* 6.25Hz */
 130                 160000000,
 131                 /* 3.125Hz */
 132                 320000000,
 133                 /* 1.5625Hz */
 134                 640000000,
 135                 /* 500Hz */
 136                 2000000,
 137         };
 138
 139         return odr_periods[odr];
 140 }
 141
 142 static int inv_icm42600_set_pwr_mgmt0(struct inv_icm42600_state *st,
 143                                       enum inv_icm42600_sensor_mode gyro,
 144                                       enum inv_icm42600_sensor_mode accel,
 145                                       bool temp, unsigned int *sleep_ms)
 146 {
 147         enum inv_icm42600_sensor_mode oldgyro = st->conf.gyro.mode;
 148         enum inv_icm42600_sensor_mode oldaccel = st->conf.accel.mode;
 149         bool oldtemp = st->conf.temp_en;
 150         unsigned int sleepval;
 151         unsigned int val;
 152         int ret;
 153
 154         /* if nothing changed, exit */
 155         if (gyro == oldgyro && accel == oldaccel && temp == oldtemp)
 156                 return 0;
 157
 158         val = INV_ICM42600_PWR_MGMT0_GYRO(gyro) |
 159               INV_ICM42600_PWR_MGMT0_ACCEL(accel);
 160         if (!temp)
 161                 val |= INV_ICM42600_PWR_MGMT0_TEMP_DIS;
 162         ret = regmap_write(st->map, INV_ICM42600_REG_PWR_MGMT0, val);
 163         if (ret)
 164                 return ret;
 165
 166         st->conf.gyro.mode = gyro;
 167         st->conf.accel.mode = accel;
 168         st->conf.temp_en = temp;
 169
 170         /* compute required wait time for sensors to stabilize */
 171         sleepval = 0;
 172         /* temperature stabilization time */
 173         if (temp && !oldtemp) {
 174                 if (sleepval < INV_ICM42600_TEMP_STARTUP_TIME_MS)
 175                         sleepval = INV_ICM42600_TEMP_STARTUP_TIME_MS;
 176         }
 177         /* accel startup time */
 178         if (accel != oldaccel && oldaccel == INV_ICM42600_SENSOR_MODE_OFF) {
 179                 /* block any register write for at least 200 µs */
 180                 usleep_range(200, 300);
 181                 if (sleepval < INV_ICM42600_ACCEL_STARTUP_TIME_MS)
 182                         sleepval = INV_ICM42600_ACCEL_STARTUP_TIME_MS;
 183         }
 184         if (gyro != oldgyro) {
 185                 /* gyro startup time */
 186                 if (oldgyro == INV_ICM42600_SENSOR_MODE_OFF) {
 187                         /* block any register write for at least 200 µs */
 188                         usleep_range(200, 300);
 189                         if (sleepval < INV_ICM42600_GYRO_STARTUP_TIME_MS)
 190                                 sleepval = INV_ICM42600_GYRO_STARTUP_TIME_MS;
 191                 /* gyro stop time */
 192                 } else if (gyro == INV_ICM42600_SENSOR_MODE_OFF) {
 193                         if (sleepval < INV_ICM42600_GYRO_STOP_TIME_MS)
 194                                 sleepval =  INV_ICM42600_GYRO_STOP_TIME_MS;
 195                 }
 196         }
 197
 198         /* deferred sleep value if sleep pointer is provided or direct sleep */
 199         if (sleep_ms)
 200                 *sleep_ms = sleepval;
 201         else if (sleepval)
 202                 msleep(sleepval);
 203
 204         return 0;
 205 }
 206
 207 int inv_icm42600_set_accel_conf(struct inv_icm42600_state *st,
 208                                 struct inv_icm42600_sensor_conf *conf,
 209                                 unsigned int *sleep_ms)
 210 {
 211         struct inv_icm42600_sensor_conf *oldconf = &st->conf.accel;
 212         unsigned int val;
 213         int ret;
 214
 215         /* Sanitize missing values with current values */
 216         if (conf->mode < 0)
 217                 conf->mode = oldconf->mode;
 218         if (conf->fs < 0)
 219                 conf->fs = oldconf->fs;
 220         if (conf->odr < 0)
 221                 conf->odr = oldconf->odr;
 222         if (conf->filter < 0)
 223                 conf->filter = oldconf->filter;
 224
 225         /* set ACCEL_CONFIG0 register (accel fullscale & odr) */
 226         if (conf->fs != oldconf->fs || conf->odr != oldconf->odr) {
 227                 val = INV_ICM42600_ACCEL_CONFIG0_FS(conf->fs) |
 228                       INV_ICM42600_ACCEL_CONFIG0_ODR(conf->odr);
 229                 ret = regmap_write(st->map, INV_ICM42600_REG_ACCEL_CONFIG0, val);
 230                 if (ret)
 231                         return ret;
 232                 oldconf->fs = conf->fs;
 233                 oldconf->odr = conf->odr;
 234         }
 235
 236         /* set GYRO_ACCEL_CONFIG0 register (accel filter) */
 237         if (conf->filter != oldconf->filter) {
 238                 val = INV_ICM42600_GYRO_ACCEL_CONFIG0_ACCEL_FILT(conf->filter) |
 239                       INV_ICM42600_GYRO_ACCEL_CONFIG0_GYRO_FILT(st->conf.gyro.filter);
 240                 ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_ACCEL_CONFIG0, val);
 241                 if (ret)
 242                         return ret;
 243                 oldconf->filter = conf->filter;
 244         }
 245
 246         /* set PWR_MGMT0 register (accel sensor mode) */
 247         return inv_icm42600_set_pwr_mgmt0(st, st->conf.gyro.mode, conf->mode,
 248                                           st->conf.temp_en, sleep_ms);
 249 }
 250
 251 int inv_icm42600_set_gyro_conf(struct inv_icm42600_state *st,
 252                                struct inv_icm42600_sensor_conf *conf,
 253                                unsigned int *sleep_ms)
 254 {
 255         struct inv_icm42600_sensor_conf *oldconf = &st->conf.gyro;
 256         unsigned int val;
 257         int ret;
 258
 259         /* sanitize missing values with current values */
 260         if (conf->mode < 0)
 261                 conf->mode = oldconf->mode;
 262         if (conf->fs < 0)
 263                 conf->fs = oldconf->fs;
 264         if (conf->odr < 0)
 265                 conf->odr = oldconf->odr;
 266         if (conf->filter < 0)
 267                 conf->filter = oldconf->filter;
 268
 269         /* set GYRO_CONFIG0 register (gyro fullscale & odr) */
 270         if (conf->fs != oldconf->fs || conf->odr != oldconf->odr) {
 271                 val = INV_ICM42600_GYRO_CONFIG0_FS(conf->fs) |
 272                       INV_ICM42600_GYRO_CONFIG0_ODR(conf->odr);
 273                 ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_CONFIG0, val);
 274                 if (ret)
 275                         return ret;
 276                 oldconf->fs = conf->fs;
 277                 oldconf->odr = conf->odr;
 278         }
 279
 280         /* set GYRO_ACCEL_CONFIG0 register (gyro filter) */
 281         if (conf->filter != oldconf->filter) {
 282                 val = INV_ICM42600_GYRO_ACCEL_CONFIG0_ACCEL_FILT(st->conf.accel.filter) |
 283                       INV_ICM42600_GYRO_ACCEL_CONFIG0_GYRO_FILT(conf->filter);
 284                 ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_ACCEL_CONFIG0, val);
 285                 if (ret)
 286                         return ret;
 287                 oldconf->filter = conf->filter;
 288         }
 289
 290         /* set PWR_MGMT0 register (gyro sensor mode) */
 291         return inv_icm42600_set_pwr_mgmt0(st, conf->mode, st->conf.accel.mode,
 292                                           st->conf.temp_en, sleep_ms);
 293
 294         return 0;
 295 }
 296
 297 int inv_icm42600_set_temp_conf(struct inv_icm42600_state *st, bool enable,
 298                                unsigned int *sleep_ms)
 299 {
 300         return inv_icm42600_set_pwr_mgmt0(st, st->conf.gyro.mode,
 301                                           st->conf.accel.mode, enable,
 302                                           sleep_ms);
 303 }
 304
 305 int inv_icm42600_debugfs_reg(struct iio_dev *indio_dev, unsigned int reg,
 306                              unsigned int writeval, unsigned int *readval)
 307 {
 308         struct inv_icm42600_state *st = iio_device_get_drvdata(indio_dev);
 309         int ret;
 310
 311         mutex_lock(&st->lock);
 312
 313         if (readval)
 314                 ret = regmap_read(st->map, reg, readval);
 315         else
 316                 ret = regmap_write(st->map, reg, writeval);
 317
 318         mutex_unlock(&st->lock);
 319
 320         return ret;
 321 }
 322
 323 static int inv_icm42600_set_conf(struct inv_icm42600_state *st,
 324                                  const struct inv_icm42600_conf *conf)
 325 {
 326         unsigned int val;
 327         int ret;
 328
 329         /* set PWR_MGMT0 register (gyro & accel sensor mode, temp enabled) */
 330         val = INV_ICM42600_PWR_MGMT0_GYRO(conf->gyro.mode) |
 331               INV_ICM42600_PWR_MGMT0_ACCEL(conf->accel.mode);
 332         if (!conf->temp_en)
 333                 val |= INV_ICM42600_PWR_MGMT0_TEMP_DIS;
 334         ret = regmap_write(st->map, INV_ICM42600_REG_PWR_MGMT0, val);
 335         if (ret)
 336                 return ret;
 337
 338         /* set GYRO_CONFIG0 register (gyro fullscale & odr) */
 339         val = INV_ICM42600_GYRO_CONFIG0_FS(conf->gyro.fs) |
 340               INV_ICM42600_GYRO_CONFIG0_ODR(conf->gyro.odr);
 341         ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_CONFIG0, val);
 342         if (ret)
 343                 return ret;
 344
 345         /* set ACCEL_CONFIG0 register (accel fullscale & odr) */
 346         val = INV_ICM42600_ACCEL_CONFIG0_FS(conf->accel.fs) |
 347               INV_ICM42600_ACCEL_CONFIG0_ODR(conf->accel.odr);
 348         ret = regmap_write(st->map, INV_ICM42600_REG_ACCEL_CONFIG0, val);
 349         if (ret)
 350                 return ret;
 351
 352         /* set GYRO_ACCEL_CONFIG0 register (gyro & accel filters) */
 353         val = INV_ICM42600_GYRO_ACCEL_CONFIG0_ACCEL_FILT(conf->accel.filter) |
 354               INV_ICM42600_GYRO_ACCEL_CONFIG0_GYRO_FILT(conf->gyro.filter);
 355         ret = regmap_write(st->map, INV_ICM42600_REG_GYRO_ACCEL_CONFIG0, val);
 356         if (ret)
 357                 return ret;
 358
 359         /* update internal conf */
 360         st->conf = *conf;
 361
 362         return 0;
 363 }
 364
 365 /**
 366  *  inv_icm42600_setup() - check and setup chip
 367  *  @st:        driver internal state
 368  *  @bus_setup: callback for setting up bus specific registers
 369  *
 370  *  Returns 0 on success, a negative error code otherwise.
 371  */
 372 static int inv_icm42600_setup(struct inv_icm42600_state *st,
 373                               inv_icm42600_bus_setup bus_setup)
 374 {
 375         const struct inv_icm42600_hw *hw = &inv_icm42600_hw[st->chip];
 376         const struct device *dev = regmap_get_device(st->map);
 377         unsigned int val;
 378         int ret;
 379
 380         /* check chip self-identification value */
 381         ret = regmap_read(st->map, INV_ICM42600_REG_WHOAMI, &val);
 382         if (ret)
 383                 return ret;
 384         if (val != hw->whoami) {
 385                 dev_err(dev, "invalid whoami %#02x expected %#02x (%s)\n",
 386                         val, hw->whoami, hw->name);
 387                 return -ENODEV;
 388         }
 389         st->name = hw->name;
 390
 391         /* reset to make sure previous state are not there */
 392         ret = regmap_write(st->map, INV_ICM42600_REG_DEVICE_CONFIG,
 393                            INV_ICM42600_DEVICE_CONFIG_SOFT_RESET);
 394         if (ret)
 395                 return ret;
 396         msleep(INV_ICM42600_RESET_TIME_MS);
 397
 398         ret = regmap_read(st->map, INV_ICM42600_REG_INT_STATUS, &val);
 399         if (ret)
 400                 return ret;
 401         if (!(val & INV_ICM42600_INT_STATUS_RESET_DONE)) {
 402                 dev_err(dev, "reset error, reset done bit not set\n");
 403                 return -ENODEV;
 404         }
 405
 406         /* set chip bus configuration */
 407         ret = bus_setup(st);
 408         if (ret)
 409                 return ret;
 410
 411         /* sensor data in big-endian (default) */
 412         ret = regmap_update_bits(st->map, INV_ICM42600_REG_INTF_CONFIG0,
 413                                  INV_ICM42600_INTF_CONFIG0_SENSOR_DATA_ENDIAN,
 414                                  INV_ICM42600_INTF_CONFIG0_SENSOR_DATA_ENDIAN);
 415         if (ret)
 416                 return ret;
 417
 418         return inv_icm42600_set_conf(st, hw->conf);
 419 }
 420
 421 static irqreturn_t inv_icm42600_irq_timestamp(int irq, void *_data)
 422 {
 423         struct inv_icm42600_state *st = _data;
 424
 425         st->timestamp.gyro = iio_get_time_ns(st->indio_gyro);
 426         st->timestamp.accel = iio_get_time_ns(st->indio_accel);
 427
 428         return IRQ_WAKE_THREAD;
 429 }
 430
 431 static irqreturn_t inv_icm42600_irq_handler(int irq, void *_data)
 432 {
 433         struct inv_icm42600_state *st = _data;
 434         struct device *dev = regmap_get_device(st->map);
 435         unsigned int status;
 436         int ret;
 437
 438         mutex_lock(&st->lock);
 439
 440         ret = regmap_read(st->map, INV_ICM42600_REG_INT_STATUS, &status);
 441         if (ret)
 442                 goto out_unlock;
 443
 444         /* FIFO full */
 445         if (status & INV_ICM42600_INT_STATUS_FIFO_FULL)
 446                 dev_warn(dev, "FIFO full data lost!\n");
 447
 448         /* FIFO threshold reached */
 449         if (status & INV_ICM42600_INT_STATUS_FIFO_THS) {
 450                 ret = inv_icm42600_buffer_fifo_read(st, 0);
 451                 if (ret) {
 452                         dev_err(dev, "FIFO read error %d\n", ret);
 453                         goto out_unlock;
 454                 }
 455                 ret = inv_icm42600_buffer_fifo_parse(st);
 456                 if (ret)
 457                         dev_err(dev, "FIFO parsing error %d\n", ret);
 458         }
 459
 460 out_unlock:
 461         mutex_unlock(&st->lock);
 462         return IRQ_HANDLED;
 463 }
 464
 465 /**
 466  * inv_icm42600_irq_init() - initialize int pin and interrupt handler
 467  * @st:         driver internal state
 468  * @irq:        irq number
 469  * @irq_type:   irq trigger type
 470  * @open_drain: true if irq is open drain, false for push-pull
 471  *
 472  * Returns 0 on success, a negative error code otherwise.
 473  */
 474 static int inv_icm42600_irq_init(struct inv_icm42600_state *st, int irq,
 475                                  int irq_type, bool open_drain)
 476 {
 477         struct device *dev = regmap_get_device(st->map);
 478         unsigned int val;
 479         int ret;
 480
 481         /* configure INT1 interrupt: default is active low on edge */
 482         switch (irq_type) {
 483         case IRQF_TRIGGER_RISING:
 484         case IRQF_TRIGGER_HIGH:
 485                 val = INV_ICM42600_INT_CONFIG_INT1_ACTIVE_HIGH;
 486                 break;
 487         default:
 488                 val = INV_ICM42600_INT_CONFIG_INT1_ACTIVE_LOW;
 489                 break;
 490         }
 491
 492         switch (irq_type) {
 493         case IRQF_TRIGGER_LOW:
 494         case IRQF_TRIGGER_HIGH:
 495                 val |= INV_ICM42600_INT_CONFIG_INT1_LATCHED;
 496                 break;
 497         default:
 498                 break;
 499         }
 500
 501         if (!open_drain)
 502                 val |= INV_ICM42600_INT_CONFIG_INT1_PUSH_PULL;
 503
 504         ret = regmap_write(st->map, INV_ICM42600_REG_INT_CONFIG, val);
 505         if (ret)
 506                 return ret;
 507
 508         /* Deassert async reset for proper INT pin operation (cf datasheet) */
 509         ret = regmap_update_bits(st->map, INV_ICM42600_REG_INT_CONFIG1,
 510                                  INV_ICM42600_INT_CONFIG1_ASYNC_RESET, 0);
 511         if (ret)
 512                 return ret;
 513
 514         return devm_request_threaded_irq(dev, irq, inv_icm42600_irq_timestamp,
 515                                          inv_icm42600_irq_handler, irq_type,
 516                                          "inv_icm42600", st);
 517 }
 518
 519 static int inv_icm42600_enable_regulator_vddio(struct inv_icm42600_state *st)
 520 {
 521         int ret;
 522
 523         ret = regulator_enable(st->vddio_supply);
 524         if (ret)
 525                 return ret;
 526
 527         /* wait a little for supply ramp */
 528         usleep_range(3000, 4000);
 529
 530         return 0;
 531 }
 532
 533 static void inv_icm42600_disable_vdd_reg(void *_data)
 534 {
 535         struct inv_icm42600_state *st = _data;
 536         const struct device *dev = regmap_get_device(st->map);
 537         int ret;
 538
 539         ret = regulator_disable(st->vdd_supply);
 540         if (ret)
 541                 dev_err(dev, "failed to disable vdd error %d\n", ret);
 542 }
 543
 544 static void inv_icm42600_disable_vddio_reg(void *_data)
 545 {
 546         struct inv_icm42600_state *st = _data;
 547         const struct device *dev = regmap_get_device(st->map);
 548         int ret;
 549
 550         ret = regulator_disable(st->vddio_supply);
 551         if (ret)
 552                 dev_err(dev, "failed to disable vddio error %d\n", ret);
 553 }
 554
 555 static void inv_icm42600_disable_pm(void *_data)
 556 {
 557         struct device *dev = _data;
 558
 559         pm_runtime_put_sync(dev);
 560         pm_runtime_disable(dev);
 561 }
 562
 563 int inv_icm42600_core_probe(struct regmap *regmap, int chip, int irq,
 564                             inv_icm42600_bus_setup bus_setup)
 565 {
 566         struct device *dev = regmap_get_device(regmap);
 567         struct inv_icm42600_state *st;
 568         struct irq_data *irq_desc;
 569         int irq_type;
 570         bool open_drain;
 571         int ret;
 572
 573         if (chip <= INV_CHIP_INVALID || chip >= INV_CHIP_NB) {
 574                 dev_err(dev, "invalid chip = %d\n", chip);
 575                 return -ENODEV;
 576         }
 577
 578         /* get irq properties, set trigger falling by default */
 579         irq_desc = irq_get_irq_data(irq);
 580         if (!irq_desc) {
 581                 dev_err(dev, "could not find IRQ %d\n", irq);
 582                 return -EINVAL;
 583         }
 584
 585         irq_type = irqd_get_trigger_type(irq_desc);
 586         if (!irq_type)
 587                 irq_type = IRQF_TRIGGER_FALLING;
 588
 589         open_drain = device_property_read_bool(dev, "drive-open-drain");
 590
 591         st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
 592         if (!st)
 593                 return -ENOMEM;
 594
 595         dev_set_drvdata(dev, st);
 596         mutex_init(&st->lock);
 597         st->chip = chip;
 598         st->map = regmap;
 599
 600         ret = iio_read_mount_matrix(dev, &st->orientation);
 601         if (ret) {
 602                 dev_err(dev, "failed to retrieve mounting matrix %d\n", ret);
 603                 return ret;
 604         }
 605
 606         st->vdd_supply = devm_regulator_get(dev, "vdd");
 607         if (IS_ERR(st->vdd_supply))
 608                 return PTR_ERR(st->vdd_supply);
 609
 610         st->vddio_supply = devm_regulator_get(dev, "vddio");
 611         if (IS_ERR(st->vddio_supply))
 612                 return PTR_ERR(st->vddio_supply);
 613
 614         ret = regulator_enable(st->vdd_supply);
 615         if (ret)
 616                 return ret;
 617         msleep(INV_ICM42600_POWER_UP_TIME_MS);
 618
 619         ret = devm_add_action_or_reset(dev, inv_icm42600_disable_vdd_reg, st);
 620         if (ret)
 621                 return ret;
 622
 623         ret = inv_icm42600_enable_regulator_vddio(st);
 624         if (ret)
 625                 return ret;
 626
 627         ret = devm_add_action_or_reset(dev, inv_icm42600_disable_vddio_reg, st);
 628         if (ret)
 629                 return ret;
 630
 631         /* setup chip registers */
 632         ret = inv_icm42600_setup(st, bus_setup);
 633         if (ret)
 634                 return ret;
 635
 636         ret = inv_icm42600_timestamp_setup(st);
 637         if (ret)
 638                 return ret;
 639
 640         ret = inv_icm42600_buffer_init(st);
 641         if (ret)
 642                 return ret;
 643
 644         st->indio_gyro = inv_icm42600_gyro_init(st);
 645         if (IS_ERR(st->indio_gyro))
 646                 return PTR_ERR(st->indio_gyro);
 647
 648         st->indio_accel = inv_icm42600_accel_init(st);
 649         if (IS_ERR(st->indio_accel))
 650                 return PTR_ERR(st->indio_accel);
 651
 652         ret = inv_icm42600_irq_init(st, irq, irq_type, open_drain);
 653         if (ret)
 654                 return ret;
 655
 656         /* setup runtime power management */
 657         ret = pm_runtime_set_active(dev);
 658         if (ret)
 659                 return ret;
 660         pm_runtime_get_noresume(dev);
 661         pm_runtime_enable(dev);
 662         pm_runtime_set_autosuspend_delay(dev, INV_ICM42600_SUSPEND_DELAY_MS);
 663         pm_runtime_use_autosuspend(dev);
 664         pm_runtime_put(dev);
 665
 666         return devm_add_action_or_reset(dev, inv_icm42600_disable_pm, dev);
 667 }
 668 EXPORT_SYMBOL_NS_GPL(inv_icm42600_core_probe, IIO_ICM42600);
 669
 670 /*
 671  * Suspend saves sensors state and turns everything off.
 672  * Check first if runtime suspend has not already done the job.
 673  */
 674 static int inv_icm42600_suspend(struct device *dev)
 675 {
 676         struct inv_icm42600_state *st = dev_get_drvdata(dev);
 677         int ret;
 678
 679         mutex_lock(&st->lock);
 680
 681         st->suspended.gyro = st->conf.gyro.mode;
 682         st->suspended.accel = st->conf.accel.mode;
 683         st->suspended.temp = st->conf.temp_en;
 684         if (pm_runtime_suspended(dev)) {
 685                 ret = 0;
 686                 goto out_unlock;
 687         }
 688
 689         /* disable FIFO data streaming */
 690         if (st->fifo.on) {
 691                 ret = regmap_write(st->map, INV_ICM42600_REG_FIFO_CONFIG,
 692                                    INV_ICM42600_FIFO_CONFIG_BYPASS);
 693                 if (ret)
 694                         goto out_unlock;
 695         }
 696
 697         ret = inv_icm42600_set_pwr_mgmt0(st, INV_ICM42600_SENSOR_MODE_OFF,
 698                                          INV_ICM42600_SENSOR_MODE_OFF, false,
 699                                          NULL);
 700         if (ret)
 701                 goto out_unlock;
 702
 703         regulator_disable(st->vddio_supply);
 704
 705 out_unlock:
 706         mutex_unlock(&st->lock);
 707         return ret;
 708 }
 709
 710 /*
 711  * System resume gets the system back on and restores the sensors state.
 712  * Manually put runtime power management in system active state.
 713  */
 714 static int inv_icm42600_resume(struct device *dev)
 715 {
 716         struct inv_icm42600_state *st = dev_get_drvdata(dev);
 717         int ret;
 718
 719         mutex_lock(&st->lock);
 720
 721         ret = inv_icm42600_enable_regulator_vddio(st);
 722         if (ret)
 723                 goto out_unlock;
 724
 725         pm_runtime_disable(dev);
 726         pm_runtime_set_active(dev);
 727         pm_runtime_enable(dev);
 728
 729         /* restore sensors state */
 730         ret = inv_icm42600_set_pwr_mgmt0(st, st->suspended.gyro,
 731                                          st->suspended.accel,
 732                                          st->suspended.temp, NULL);
 733         if (ret)
 734                 goto out_unlock;
 735
 736         /* restore FIFO data streaming */
 737         if (st->fifo.on)
 738                 ret = regmap_write(st->map, INV_ICM42600_REG_FIFO_CONFIG,
 739                                    INV_ICM42600_FIFO_CONFIG_STREAM);
 740
 741 out_unlock:
 742         mutex_unlock(&st->lock);
 743         return ret;
 744 }
 745
 746 /* Runtime suspend will turn off sensors that are enabled by iio devices. */
 747 static int inv_icm42600_runtime_suspend(struct device *dev)
 748 {
 749         struct inv_icm42600_state *st = dev_get_drvdata(dev);
 750         int ret;
 751
 752         mutex_lock(&st->lock);
 753
 754         /* disable all sensors */
 755         ret = inv_icm42600_set_pwr_mgmt0(st, INV_ICM42600_SENSOR_MODE_OFF,
 756                                          INV_ICM42600_SENSOR_MODE_OFF, false,
 757                                          NULL);
 758         if (ret)
 759                 goto error_unlock;
 760
 761         regulator_disable(st->vddio_supply);
 762
 763 error_unlock:
 764         mutex_unlock(&st->lock);
 765         return ret;
 766 }
 767
 768 /* Sensors are enabled by iio devices, no need to turn them back on here. */
 769 static int inv_icm42600_runtime_resume(struct device *dev)
 770 {
 771         struct inv_icm42600_state *st = dev_get_drvdata(dev);
 772         int ret;
 773
 774         mutex_lock(&st->lock);
 775
 776         ret = inv_icm42600_enable_regulator_vddio(st);
 777
 778         mutex_unlock(&st->lock);
 779         return ret;
 780 }
 781
 782 EXPORT_NS_GPL_DEV_PM_OPS(inv_icm42600_pm_ops, IIO_ICM42600) = {
 783         SYSTEM_SLEEP_PM_OPS(inv_icm42600_suspend, inv_icm42600_resume)
 784         RUNTIME_PM_OPS(inv_icm42600_runtime_suspend,
 785                        inv_icm42600_runtime_resume, NULL)
 786 };
 787
 788 MODULE_AUTHOR("InvenSense, Inc.");
 789 MODULE_DESCRIPTION("InvenSense ICM-426xx device driver");
 790 MODULE_LICENSE("GPL");