drivers/iio/magnetometer/hid-sensor-magn-3d.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2012, Intel Corporation.
   5  */
   6 #include <linux/device.h>
   7 #include <linux/platform_device.h>
   8 #include <linux/module.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/irq.h>
  11 #include <linux/slab.h>
  12 #include <linux/delay.h>
  13 #include <linux/hid-sensor-hub.h>
  14 #include <linux/iio/iio.h>
  15 #include <linux/iio/sysfs.h>
  16 #include <linux/iio/buffer.h>
  17 #include "../common/hid-sensors/hid-sensor-trigger.h"
  18
  19 enum magn_3d_channel {
  20         CHANNEL_SCAN_INDEX_X,
  21         CHANNEL_SCAN_INDEX_Y,
  22         CHANNEL_SCAN_INDEX_Z,
  23         CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP,
  24         CHANNEL_SCAN_INDEX_NORTH_TRUE_TILT_COMP,
  25         CHANNEL_SCAN_INDEX_NORTH_MAGN,
  26         CHANNEL_SCAN_INDEX_NORTH_TRUE,
  27         CHANNEL_SCAN_INDEX_TIMESTAMP,
  28         MAGN_3D_CHANNEL_MAX,
  29 };
  30
  31 struct common_attributes {
  32         int scale_pre_decml;
  33         int scale_post_decml;
  34         int scale_precision;
  35         int value_offset;
  36 };
  37
  38 struct magn_3d_state {
  39         struct hid_sensor_hub_callbacks callbacks;
  40         struct hid_sensor_common magn_flux_attributes;
  41         struct hid_sensor_common rot_attributes;
  42         struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
  43
  44         /* dynamically sized array to hold sensor values */
  45         u32 *iio_vals;
  46         /* array of pointers to sensor value */
  47         u32 *magn_val_addr[MAGN_3D_CHANNEL_MAX];
  48
  49         struct common_attributes magn_flux_attr;
  50         struct common_attributes rot_attr;
  51         s64 timestamp;
  52 };
  53
  54 static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
  55         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
  56         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
  57         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS,
  58         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
  59         HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH,
  60         HID_USAGE_SENSOR_ORIENT_MAGN_NORTH,
  61         HID_USAGE_SENSOR_ORIENT_TRUE_NORTH,
  62         HID_USAGE_SENSOR_TIME_TIMESTAMP,
  63 };
  64
  65 /* Channel definitions */
  66 static const struct iio_chan_spec magn_3d_channels[] = {
  67         {
  68                 .type = IIO_MAGN,
  69                 .modified = 1,
  70                 .channel2 = IIO_MOD_X,
  71                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  72                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  73                 BIT(IIO_CHAN_INFO_SCALE) |
  74                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  75                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  76         }, {
  77                 .type = IIO_MAGN,
  78                 .modified = 1,
  79                 .channel2 = IIO_MOD_Y,
  80                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  81                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  82                 BIT(IIO_CHAN_INFO_SCALE) |
  83                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  84                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  85         }, {
  86                 .type = IIO_MAGN,
  87                 .modified = 1,
  88                 .channel2 = IIO_MOD_Z,
  89                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  90                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  91                 BIT(IIO_CHAN_INFO_SCALE) |
  92                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  93                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  94         }, {
  95                 .type = IIO_ROT,
  96                 .modified = 1,
  97                 .channel2 = IIO_MOD_NORTH_MAGN_TILT_COMP,
  98                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  99                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 100                 BIT(IIO_CHAN_INFO_SCALE) |
 101                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 102                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 103         }, {
 104                 .type = IIO_ROT,
 105                 .modified = 1,
 106                 .channel2 = IIO_MOD_NORTH_TRUE_TILT_COMP,
 107                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 108                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 109                 BIT(IIO_CHAN_INFO_SCALE) |
 110                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 111                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 112         }, {
 113                 .type = IIO_ROT,
 114                 .modified = 1,
 115                 .channel2 = IIO_MOD_NORTH_MAGN,
 116                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 117                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 118                 BIT(IIO_CHAN_INFO_SCALE) |
 119                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 120                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 121         }, {
 122                 .type = IIO_ROT,
 123                 .modified = 1,
 124                 .channel2 = IIO_MOD_NORTH_TRUE,
 125                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 126                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 127                 BIT(IIO_CHAN_INFO_SCALE) |
 128                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 129                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 130         },
 131         IIO_CHAN_SOFT_TIMESTAMP(7)
 132 };
 133
 134 /* Adjust channel real bits based on report descriptor */
 135 static void magn_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
 136                                                 int channel, int size)
 137 {
 138         channels[channel].scan_type.sign = 's';
 139         /* Real storage bits will change based on the report desc. */
 140         channels[channel].scan_type.realbits = size * 8;
 141         /* Maximum size of a sample to capture is u32 */
 142         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
 143 }
 144
 145 /* Channel read_raw handler */
 146 static int magn_3d_read_raw(struct iio_dev *indio_dev,
 147                               struct iio_chan_spec const *chan,
 148                               int *val, int *val2,
 149                               long mask)
 150 {
 151         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 152         int report_id = -1;
 153         u32 address;
 154         int ret_type;
 155         s32 min;
 156
 157         *val = 0;
 158         *val2 = 0;
 159         switch (mask) {
 160         case IIO_CHAN_INFO_RAW:
 161                 hid_sensor_power_state(&magn_state->magn_flux_attributes, true);
 162                 report_id = magn_state->magn[chan->address].report_id;
 163                 min = magn_state->magn[chan->address].logical_minimum;
 164                 address = magn_3d_addresses[chan->address];
 165                 if (report_id >= 0)
 166                         *val = sensor_hub_input_attr_get_raw_value(
 167                                 magn_state->magn_flux_attributes.hsdev,
 168                                 HID_USAGE_SENSOR_COMPASS_3D, address,
 169                                 report_id,
 170                                 SENSOR_HUB_SYNC,
 171                                 min < 0);
 172                 else {
 173                         *val = 0;
 174                         hid_sensor_power_state(
 175                                 &magn_state->magn_flux_attributes,
 176                                 false);
 177                         return -EINVAL;
 178                 }
 179                 hid_sensor_power_state(&magn_state->magn_flux_attributes,
 180                                         false);
 181                 ret_type = IIO_VAL_INT;
 182                 break;
 183         case IIO_CHAN_INFO_SCALE:
 184                 switch (chan->type) {
 185                 case IIO_MAGN:
 186                         *val = magn_state->magn_flux_attr.scale_pre_decml;
 187                         *val2 = magn_state->magn_flux_attr.scale_post_decml;
 188                         ret_type = magn_state->magn_flux_attr.scale_precision;
 189                         break;
 190                 case IIO_ROT:
 191                         *val = magn_state->rot_attr.scale_pre_decml;
 192                         *val2 = magn_state->rot_attr.scale_post_decml;
 193                         ret_type = magn_state->rot_attr.scale_precision;
 194                         break;
 195                 default:
 196                         ret_type = -EINVAL;
 197                 }
 198                 break;
 199         case IIO_CHAN_INFO_OFFSET:
 200                 switch (chan->type) {
 201                 case IIO_MAGN:
 202                         *val = magn_state->magn_flux_attr.value_offset;
 203                         ret_type = IIO_VAL_INT;
 204                         break;
 205                 case IIO_ROT:
 206                         *val = magn_state->rot_attr.value_offset;
 207                         ret_type = IIO_VAL_INT;
 208                         break;
 209                 default:
 210                         ret_type = -EINVAL;
 211                 }
 212                 break;
 213         case IIO_CHAN_INFO_SAMP_FREQ:
 214                 ret_type = hid_sensor_read_samp_freq_value(
 215                         &magn_state->magn_flux_attributes, val, val2);
 216                 break;
 217         case IIO_CHAN_INFO_HYSTERESIS:
 218                 switch (chan->type) {
 219                 case IIO_MAGN:
 220                         ret_type = hid_sensor_read_raw_hyst_value(
 221                                 &magn_state->magn_flux_attributes, val, val2);
 222                         break;
 223                 case IIO_ROT:
 224                         ret_type = hid_sensor_read_raw_hyst_value(
 225                                 &magn_state->rot_attributes, val, val2);
 226                         break;
 227                 default:
 228                         ret_type = -EINVAL;
 229                 }
 230                 break;
 231         default:
 232                 ret_type = -EINVAL;
 233                 break;
 234         }
 235
 236         return ret_type;
 237 }
 238
 239 /* Channel write_raw handler */
 240 static int magn_3d_write_raw(struct iio_dev *indio_dev,
 241                                struct iio_chan_spec const *chan,
 242                                int val,
 243                                int val2,
 244                                long mask)
 245 {
 246         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 247         int ret = 0;
 248
 249         switch (mask) {
 250         case IIO_CHAN_INFO_SAMP_FREQ:
 251                 ret = hid_sensor_write_samp_freq_value(
 252                                 &magn_state->magn_flux_attributes, val, val2);
 253                 break;
 254         case IIO_CHAN_INFO_HYSTERESIS:
 255                 switch (chan->type) {
 256                 case IIO_MAGN:
 257                         ret = hid_sensor_write_raw_hyst_value(
 258                                 &magn_state->magn_flux_attributes, val, val2);
 259                         break;
 260                 case IIO_ROT:
 261                         ret = hid_sensor_write_raw_hyst_value(
 262                                 &magn_state->rot_attributes, val, val2);
 263                         break;
 264                 default:
 265                         ret = -EINVAL;
 266                 }
 267                 break;
 268         default:
 269                 ret = -EINVAL;
 270         }
 271
 272         return ret;
 273 }
 274
 275 static const struct iio_info magn_3d_info = {
 276         .read_raw = &magn_3d_read_raw,
 277         .write_raw = &magn_3d_write_raw,
 278 };
 279
 280 /* Callback handler to send event after all samples are received and captured */
 281 static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 282                                 unsigned usage_id,
 283                                 void *priv)
 284 {
 285         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 286         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 287
 288         dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
 289         if (atomic_read(&magn_state->magn_flux_attributes.data_ready)) {
 290                 if (!magn_state->timestamp)
 291                         magn_state->timestamp = iio_get_time_ns(indio_dev);
 292
 293                 iio_push_to_buffers_with_timestamp(indio_dev,
 294                                                    magn_state->iio_vals,
 295                                                    magn_state->timestamp);
 296                 magn_state->timestamp = 0;
 297         }
 298
 299         return 0;
 300 }
 301
 302 /* Capture samples in local storage */
 303 static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 304                                 unsigned usage_id,
 305                                 size_t raw_len, char *raw_data,
 306                                 void *priv)
 307 {
 308         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 309         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 310         int offset;
 311         int ret = 0;
 312         u32 *iio_val = NULL;
 313
 314         switch (usage_id) {
 315         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
 316         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
 317         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
 318                 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS)
 319                                 + CHANNEL_SCAN_INDEX_X;
 320         break;
 321         case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH:
 322         case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH:
 323         case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH:
 324         case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH:
 325                 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH)
 326                                 + CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP;
 327         break;
 328         case HID_USAGE_SENSOR_TIME_TIMESTAMP:
 329                 magn_state->timestamp =
 330                         hid_sensor_convert_timestamp(&magn_state->magn_flux_attributes,
 331                                                      *(s64 *)raw_data);
 332                 return ret;
 333         default:
 334                 return -EINVAL;
 335         }
 336
 337         iio_val = magn_state->magn_val_addr[offset];
 338
 339         if (iio_val != NULL)
 340                 *iio_val = *((u32 *)raw_data);
 341         else
 342                 ret = -EINVAL;
 343
 344         return ret;
 345 }
 346
 347 /* Parse report which is specific to an usage id*/
 348 static int magn_3d_parse_report(struct platform_device *pdev,
 349                                 struct hid_sensor_hub_device *hsdev,
 350                                 struct iio_chan_spec **channels,
 351                                 int *chan_count,
 352                                 unsigned usage_id,
 353                                 struct magn_3d_state *st)
 354 {
 355         int i;
 356         int attr_count = 0;
 357         struct iio_chan_spec *_channels;
 358
 359         /* Scan for each usage attribute supported */
 360         for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
 361                 int status;
 362                 u32 address = magn_3d_addresses[i];
 363
 364                 /* Check if usage attribute exists in the sensor hub device */
 365                 status = sensor_hub_input_get_attribute_info(hsdev,
 366                         HID_INPUT_REPORT,
 367                         usage_id,
 368                         address,
 369                         &(st->magn[i]));
 370                 if (!status)
 371                         attr_count++;
 372         }
 373
 374         if (attr_count <= 0) {
 375                 dev_err(&pdev->dev,
 376                         "failed to find any supported usage attributes in report\n");
 377                 return  -EINVAL;
 378         }
 379
 380         dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n",
 381                         attr_count);
 382         dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %x:%x\n",
 383                         st->magn[0].index,
 384                         st->magn[0].report_id,
 385                         st->magn[1].index, st->magn[1].report_id,
 386                         st->magn[2].index, st->magn[2].report_id);
 387
 388         /* Setup IIO channel array */
 389         _channels = devm_kcalloc(&pdev->dev, attr_count,
 390                                 sizeof(struct iio_chan_spec),
 391                                 GFP_KERNEL);
 392         if (!_channels) {
 393                 dev_err(&pdev->dev,
 394                         "failed to allocate space for iio channels\n");
 395                 return -ENOMEM;
 396         }
 397
 398         /* attr_count include timestamp channel, and the iio_vals should be aligned to 8byte */
 399         st->iio_vals = devm_kcalloc(&pdev->dev,
 400                                     ((attr_count + 1) % 2 + (attr_count + 1) / 2) * 2,
 401                                     sizeof(u32), GFP_KERNEL);
 402         if (!st->iio_vals) {
 403                 dev_err(&pdev->dev,
 404                         "failed to allocate space for iio values array\n");
 405                 return -ENOMEM;
 406         }
 407
 408         for (i = 0, *chan_count = 0;
 409         i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count;
 410         i++){
 411                 if (st->magn[i].index >= 0) {
 412                         /* Setup IIO channel struct */
 413                         (_channels[*chan_count]) = magn_3d_channels[i];
 414                         (_channels[*chan_count]).scan_index = *chan_count;
 415                         (_channels[*chan_count]).address = i;
 416
 417                         if (i != CHANNEL_SCAN_INDEX_TIMESTAMP) {
 418                                 /* Set magn_val_addr to iio value address */
 419                                 st->magn_val_addr[i] = &st->iio_vals[*chan_count];
 420                                 magn_3d_adjust_channel_bit_mask(_channels,
 421                                                                 *chan_count,
 422                                                                 st->magn[i].size);
 423                         }
 424                         (*chan_count)++;
 425                 }
 426         }
 427
 428         if (*chan_count <= 0) {
 429                 dev_err(&pdev->dev,
 430                         "failed to find any magnetic channels setup\n");
 431                 return -EINVAL;
 432         }
 433
 434         *channels = _channels;
 435
 436         dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n",
 437                         *chan_count);
 438
 439         st->magn_flux_attr.scale_precision = hid_sensor_format_scale(
 440                                 HID_USAGE_SENSOR_COMPASS_3D,
 441                                 &st->magn[CHANNEL_SCAN_INDEX_X],
 442                                 &st->magn_flux_attr.scale_pre_decml,
 443                                 &st->magn_flux_attr.scale_post_decml);
 444         st->rot_attr.scale_precision
 445                 = hid_sensor_format_scale(
 446                         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
 447                         &st->magn[CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP],
 448                         &st->rot_attr.scale_pre_decml,
 449                         &st->rot_attr.scale_post_decml);
 450
 451         /* Set Sensitivity field ids, when there is no individual modifier */
 452         if (st->magn_flux_attributes.sensitivity.index < 0) {
 453                 sensor_hub_input_get_attribute_info(hsdev,
 454                         HID_FEATURE_REPORT, usage_id,
 455                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 456                         HID_USAGE_SENSOR_DATA_ORIENTATION,
 457                         &st->magn_flux_attributes.sensitivity);
 458                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 459                         st->magn_flux_attributes.sensitivity.index,
 460                         st->magn_flux_attributes.sensitivity.report_id);
 461         }
 462         if (st->magn_flux_attributes.sensitivity.index < 0) {
 463                 sensor_hub_input_get_attribute_info(hsdev,
 464                         HID_FEATURE_REPORT, usage_id,
 465                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 466                         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX,
 467                         &st->magn_flux_attributes.sensitivity);
 468                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 469                         st->magn_flux_attributes.sensitivity.index,
 470                         st->magn_flux_attributes.sensitivity.report_id);
 471         }
 472         if (st->rot_attributes.sensitivity.index < 0) {
 473                 sensor_hub_input_get_attribute_info(hsdev,
 474                         HID_FEATURE_REPORT, usage_id,
 475                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 476                         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
 477                         &st->rot_attributes.sensitivity);
 478                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 479                         st->rot_attributes.sensitivity.index,
 480                         st->rot_attributes.sensitivity.report_id);
 481         }
 482
 483         return 0;
 484 }
 485
 486 /* Function to initialize the processing for usage id */
 487 static int hid_magn_3d_probe(struct platform_device *pdev)
 488 {
 489         int ret = 0;
 490         static char *name = "magn_3d";
 491         struct iio_dev *indio_dev;
 492         struct magn_3d_state *magn_state;
 493         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 494         struct iio_chan_spec *channels;
 495         int chan_count = 0;
 496
 497         indio_dev = devm_iio_device_alloc(&pdev->dev,
 498                                           sizeof(struct magn_3d_state));
 499         if (indio_dev == NULL)
 500                 return -ENOMEM;
 501
 502         platform_set_drvdata(pdev, indio_dev);
 503
 504         magn_state = iio_priv(indio_dev);
 505         magn_state->magn_flux_attributes.hsdev = hsdev;
 506         magn_state->magn_flux_attributes.pdev = pdev;
 507
 508         ret = hid_sensor_parse_common_attributes(hsdev,
 509                                 HID_USAGE_SENSOR_COMPASS_3D,
 510                                 &magn_state->magn_flux_attributes);
 511         if (ret) {
 512                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 513                 return ret;
 514         }
 515         magn_state->rot_attributes = magn_state->magn_flux_attributes;
 516
 517         ret = magn_3d_parse_report(pdev, hsdev,
 518                                 &channels, &chan_count,
 519                                 HID_USAGE_SENSOR_COMPASS_3D, magn_state);
 520         if (ret) {
 521                 dev_err(&pdev->dev, "failed to parse report\n");
 522                 return ret;
 523         }
 524
 525         indio_dev->channels = channels;
 526         indio_dev->num_channels = chan_count;
 527         indio_dev->info = &magn_3d_info;
 528         indio_dev->name = name;
 529         indio_dev->modes = INDIO_DIRECT_MODE;
 530
 531         atomic_set(&magn_state->magn_flux_attributes.data_ready, 0);
 532
 533         ret = hid_sensor_setup_trigger(indio_dev, name,
 534                                         &magn_state->magn_flux_attributes);
 535         if (ret < 0) {
 536                 dev_err(&pdev->dev, "trigger setup failed\n");
 537                 return ret;
 538         }
 539
 540         ret = iio_device_register(indio_dev);
 541         if (ret) {
 542                 dev_err(&pdev->dev, "device register failed\n");
 543                 goto error_remove_trigger;
 544         }
 545
 546         magn_state->callbacks.send_event = magn_3d_proc_event;
 547         magn_state->callbacks.capture_sample = magn_3d_capture_sample;
 548         magn_state->callbacks.pdev = pdev;
 549         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
 550                                         &magn_state->callbacks);
 551         if (ret < 0) {
 552                 dev_err(&pdev->dev, "callback reg failed\n");
 553                 goto error_iio_unreg;
 554         }
 555
 556         return ret;
 557
 558 error_iio_unreg:
 559         iio_device_unregister(indio_dev);
 560 error_remove_trigger:
 561         hid_sensor_remove_trigger(indio_dev, &magn_state->magn_flux_attributes);
 562         return ret;
 563 }
 564
 565 /* Function to deinitialize the processing for usage id */
 566 static int hid_magn_3d_remove(struct platform_device *pdev)
 567 {
 568         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 569         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 570         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 571
 572         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
 573         iio_device_unregister(indio_dev);
 574         hid_sensor_remove_trigger(indio_dev, &magn_state->magn_flux_attributes);
 575
 576         return 0;
 577 }
 578
 579 static const struct platform_device_id hid_magn_3d_ids[] = {
 580         {
 581                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 582                 .name = "HID-SENSOR-200083",
 583         },
 584         { /* sentinel */ }
 585 };
 586 MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids);
 587
 588 static struct platform_driver hid_magn_3d_platform_driver = {
 589         .id_table = hid_magn_3d_ids,
 590         .driver = {
 591                 .name   = KBUILD_MODNAME,
 592                 .pm     = &hid_sensor_pm_ops,
 593         },
 594         .probe          = hid_magn_3d_probe,
 595         .remove         = hid_magn_3d_remove,
 596 };
 597 module_platform_driver(hid_magn_3d_platform_driver);
 598
 599 MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
 600 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 601 MODULE_LICENSE("GPL");