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

   1 /*
   2  * HID Sensors Driver
   3  * Copyright (c) 2012, 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  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  */
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/module.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/irq.h>
  24 #include <linux/slab.h>
  25 #include <linux/delay.h>
  26 #include <linux/hid-sensor-hub.h>
  27 #include <linux/iio/iio.h>
  28 #include <linux/iio/sysfs.h>
  29 #include <linux/iio/buffer.h>
  30 #include <linux/iio/trigger_consumer.h>
  31 #include <linux/iio/triggered_buffer.h>
  32 #include "../common/hid-sensors/hid-sensor-trigger.h"
  33
  34 enum magn_3d_channel {
  35         CHANNEL_SCAN_INDEX_X,
  36         CHANNEL_SCAN_INDEX_Y,
  37         CHANNEL_SCAN_INDEX_Z,
  38         CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP,
  39         CHANNEL_SCAN_INDEX_NORTH_TRUE_TILT_COMP,
  40         CHANNEL_SCAN_INDEX_NORTH_MAGN,
  41         CHANNEL_SCAN_INDEX_NORTH_TRUE,
  42         MAGN_3D_CHANNEL_MAX,
  43 };
  44
  45 struct common_attributes {
  46         int scale_pre_decml;
  47         int scale_post_decml;
  48         int scale_precision;
  49         int value_offset;
  50 };
  51
  52 struct magn_3d_state {
  53         struct hid_sensor_hub_callbacks callbacks;
  54         struct hid_sensor_common magn_flux_attributes;
  55         struct hid_sensor_common rot_attributes;
  56         struct hid_sensor_hub_attribute_info magn[MAGN_3D_CHANNEL_MAX];
  57
  58         /* dynamically sized array to hold sensor values */
  59         u32 *iio_vals;
  60         /* array of pointers to sensor value */
  61         u32 *magn_val_addr[MAGN_3D_CHANNEL_MAX];
  62
  63         struct common_attributes magn_flux_attr;
  64         struct common_attributes rot_attr;
  65 };
  66
  67 static const u32 magn_3d_addresses[MAGN_3D_CHANNEL_MAX] = {
  68         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS,
  69         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS,
  70         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS,
  71         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
  72         HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH,
  73         HID_USAGE_SENSOR_ORIENT_MAGN_NORTH,
  74         HID_USAGE_SENSOR_ORIENT_TRUE_NORTH,
  75 };
  76
  77 /* Channel definitions */
  78 static const struct iio_chan_spec magn_3d_channels[] = {
  79         {
  80                 .type = IIO_MAGN,
  81                 .modified = 1,
  82                 .channel2 = IIO_MOD_X,
  83                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  84                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  85                 BIT(IIO_CHAN_INFO_SCALE) |
  86                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  87                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  88         }, {
  89                 .type = IIO_MAGN,
  90                 .modified = 1,
  91                 .channel2 = IIO_MOD_Y,
  92                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  93                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  94                 BIT(IIO_CHAN_INFO_SCALE) |
  95                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  96                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  97         }, {
  98                 .type = IIO_MAGN,
  99                 .modified = 1,
 100                 .channel2 = IIO_MOD_Z,
 101                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 102                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 103                 BIT(IIO_CHAN_INFO_SCALE) |
 104                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 105                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 106         }, {
 107                 .type = IIO_ROT,
 108                 .modified = 1,
 109                 .channel2 = IIO_MOD_NORTH_MAGN_TILT_COMP,
 110                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 111                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 112                 BIT(IIO_CHAN_INFO_SCALE) |
 113                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 114                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 115         }, {
 116                 .type = IIO_ROT,
 117                 .modified = 1,
 118                 .channel2 = IIO_MOD_NORTH_TRUE_TILT_COMP,
 119                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 120                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 121                 BIT(IIO_CHAN_INFO_SCALE) |
 122                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 123                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 124         }, {
 125                 .type = IIO_ROT,
 126                 .modified = 1,
 127                 .channel2 = IIO_MOD_NORTH_MAGN,
 128                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 129                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 130                 BIT(IIO_CHAN_INFO_SCALE) |
 131                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 132                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 133         }, {
 134                 .type = IIO_ROT,
 135                 .modified = 1,
 136                 .channel2 = IIO_MOD_NORTH_TRUE,
 137                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 138                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 139                 BIT(IIO_CHAN_INFO_SCALE) |
 140                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 141                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 142         }
 143 };
 144
 145 /* Adjust channel real bits based on report descriptor */
 146 static void magn_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
 147                                                 int channel, int size)
 148 {
 149         channels[channel].scan_type.sign = 's';
 150         /* Real storage bits will change based on the report desc. */
 151         channels[channel].scan_type.realbits = size * 8;
 152         /* Maximum size of a sample to capture is u32 */
 153         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
 154 }
 155
 156 /* Channel read_raw handler */
 157 static int magn_3d_read_raw(struct iio_dev *indio_dev,
 158                               struct iio_chan_spec const *chan,
 159                               int *val, int *val2,
 160                               long mask)
 161 {
 162         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 163         int report_id = -1;
 164         u32 address;
 165         int ret_type;
 166
 167         *val = 0;
 168         *val2 = 0;
 169         switch (mask) {
 170         case IIO_CHAN_INFO_RAW:
 171                 hid_sensor_power_state(&magn_state->magn_flux_attributes, true);
 172                 report_id =
 173                         magn_state->magn[chan->address].report_id;
 174                 address = magn_3d_addresses[chan->address];
 175                 if (report_id >= 0)
 176                         *val = sensor_hub_input_attr_get_raw_value(
 177                                 magn_state->magn_flux_attributes.hsdev,
 178                                 HID_USAGE_SENSOR_COMPASS_3D, address,
 179                                 report_id,
 180                                 SENSOR_HUB_SYNC);
 181                 else {
 182                         *val = 0;
 183                         hid_sensor_power_state(
 184                                 &magn_state->magn_flux_attributes,
 185                                 false);
 186                         return -EINVAL;
 187                 }
 188                 hid_sensor_power_state(&magn_state->magn_flux_attributes,
 189                                         false);
 190                 ret_type = IIO_VAL_INT;
 191                 break;
 192         case IIO_CHAN_INFO_SCALE:
 193                 switch (chan->type) {
 194                 case IIO_MAGN:
 195                         *val = magn_state->magn_flux_attr.scale_pre_decml;
 196                         *val2 = magn_state->magn_flux_attr.scale_post_decml;
 197                         ret_type = magn_state->magn_flux_attr.scale_precision;
 198                         break;
 199                 case IIO_ROT:
 200                         *val = magn_state->rot_attr.scale_pre_decml;
 201                         *val2 = magn_state->rot_attr.scale_post_decml;
 202                         ret_type = magn_state->rot_attr.scale_precision;
 203                         break;
 204                 default:
 205                         ret_type = -EINVAL;
 206                 }
 207                 break;
 208         case IIO_CHAN_INFO_OFFSET:
 209                 switch (chan->type) {
 210                 case IIO_MAGN:
 211                         *val = magn_state->magn_flux_attr.value_offset;
 212                         ret_type = IIO_VAL_INT;
 213                         break;
 214                 case IIO_ROT:
 215                         *val = magn_state->rot_attr.value_offset;
 216                         ret_type = IIO_VAL_INT;
 217                         break;
 218                 default:
 219                         ret_type = -EINVAL;
 220                 }
 221                 break;
 222         case IIO_CHAN_INFO_SAMP_FREQ:
 223                 ret_type = hid_sensor_read_samp_freq_value(
 224                         &magn_state->magn_flux_attributes, val, val2);
 225                 break;
 226         case IIO_CHAN_INFO_HYSTERESIS:
 227                 switch (chan->type) {
 228                 case IIO_MAGN:
 229                         ret_type = hid_sensor_read_raw_hyst_value(
 230                                 &magn_state->magn_flux_attributes, val, val2);
 231                         break;
 232                 case IIO_ROT:
 233                         ret_type = hid_sensor_read_raw_hyst_value(
 234                                 &magn_state->rot_attributes, val, val2);
 235                         break;
 236                 default:
 237                         ret_type = -EINVAL;
 238                 }
 239                 break;
 240         default:
 241                 ret_type = -EINVAL;
 242                 break;
 243         }
 244
 245         return ret_type;
 246 }
 247
 248 /* Channel write_raw handler */
 249 static int magn_3d_write_raw(struct iio_dev *indio_dev,
 250                                struct iio_chan_spec const *chan,
 251                                int val,
 252                                int val2,
 253                                long mask)
 254 {
 255         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 256         int ret = 0;
 257
 258         switch (mask) {
 259         case IIO_CHAN_INFO_SAMP_FREQ:
 260                 ret = hid_sensor_write_samp_freq_value(
 261                                 &magn_state->magn_flux_attributes, val, val2);
 262                 break;
 263         case IIO_CHAN_INFO_HYSTERESIS:
 264                 switch (chan->type) {
 265                 case IIO_MAGN:
 266                         ret = hid_sensor_write_raw_hyst_value(
 267                                 &magn_state->magn_flux_attributes, val, val2);
 268                         break;
 269                 case IIO_ROT:
 270                         ret = hid_sensor_write_raw_hyst_value(
 271                                 &magn_state->rot_attributes, val, val2);
 272                         break;
 273                 default:
 274                         ret = -EINVAL;
 275                 }
 276                 break;
 277         default:
 278                 ret = -EINVAL;
 279         }
 280
 281         return ret;
 282 }
 283
 284 static const struct iio_info magn_3d_info = {
 285         .read_raw = &magn_3d_read_raw,
 286         .write_raw = &magn_3d_write_raw,
 287 };
 288
 289 /* Function to push data to buffer */
 290 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data)
 291 {
 292         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 293         iio_push_to_buffers(indio_dev, data);
 294 }
 295
 296 /* Callback handler to send event after all samples are received and captured */
 297 static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 298                                 unsigned usage_id,
 299                                 void *priv)
 300 {
 301         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 302         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 303
 304         dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
 305         if (atomic_read(&magn_state->magn_flux_attributes.data_ready))
 306                 hid_sensor_push_data(indio_dev, magn_state->iio_vals);
 307
 308         return 0;
 309 }
 310
 311 /* Capture samples in local storage */
 312 static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 313                                 unsigned usage_id,
 314                                 size_t raw_len, char *raw_data,
 315                                 void *priv)
 316 {
 317         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 318         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 319         int offset;
 320         int ret = 0;
 321         u32 *iio_val = NULL;
 322
 323         switch (usage_id) {
 324         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
 325         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
 326         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
 327                 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS)
 328                                 + CHANNEL_SCAN_INDEX_X;
 329         break;
 330         case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH:
 331         case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH:
 332         case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH:
 333         case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH:
 334                 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH)
 335                                 + CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP;
 336         break;
 337         default:
 338                 return -EINVAL;
 339         }
 340
 341         iio_val = magn_state->magn_val_addr[offset];
 342
 343         if (iio_val != NULL)
 344                 *iio_val = *((u32 *)raw_data);
 345         else
 346                 ret = -EINVAL;
 347
 348         return ret;
 349 }
 350
 351 /* Parse report which is specific to an usage id*/
 352 static int magn_3d_parse_report(struct platform_device *pdev,
 353                                 struct hid_sensor_hub_device *hsdev,
 354                                 struct iio_chan_spec **channels,
 355                                 int *chan_count,
 356                                 unsigned usage_id,
 357                                 struct magn_3d_state *st)
 358 {
 359         int i;
 360         int attr_count = 0;
 361         struct iio_chan_spec *_channels;
 362
 363         /* Scan for each usage attribute supported */
 364         for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
 365                 int status;
 366                 u32 address = magn_3d_addresses[i];
 367
 368                 /* Check if usage attribute exists in the sensor hub device */
 369                 status = sensor_hub_input_get_attribute_info(hsdev,
 370                         HID_INPUT_REPORT,
 371                         usage_id,
 372                         address,
 373                         &(st->magn[i]));
 374                 if (!status)
 375                         attr_count++;
 376         }
 377
 378         if (attr_count <= 0) {
 379                 dev_err(&pdev->dev,
 380                         "failed to find any supported usage attributes in report\n");
 381                 return  -EINVAL;
 382         }
 383
 384         dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n",
 385                         attr_count);
 386         dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %x:%x\n",
 387                         st->magn[0].index,
 388                         st->magn[0].report_id,
 389                         st->magn[1].index, st->magn[1].report_id,
 390                         st->magn[2].index, st->magn[2].report_id);
 391
 392         /* Setup IIO channel array */
 393         _channels = devm_kcalloc(&pdev->dev, attr_count,
 394                                 sizeof(struct iio_chan_spec),
 395                                 GFP_KERNEL);
 396         if (!_channels) {
 397                 dev_err(&pdev->dev,
 398                         "failed to allocate space for iio channels\n");
 399                 return -ENOMEM;
 400         }
 401
 402         st->iio_vals = devm_kcalloc(&pdev->dev, attr_count,
 403                                 sizeof(u32),
 404                                 GFP_KERNEL);
 405         if (!st->iio_vals) {
 406                 dev_err(&pdev->dev,
 407                         "failed to allocate space for iio values array\n");
 408                 return -ENOMEM;
 409         }
 410
 411         for (i = 0, *chan_count = 0;
 412         i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count;
 413         i++){
 414                 if (st->magn[i].index >= 0) {
 415                         /* Setup IIO channel struct */
 416                         (_channels[*chan_count]) = magn_3d_channels[i];
 417                         (_channels[*chan_count]).scan_index = *chan_count;
 418                         (_channels[*chan_count]).address = i;
 419
 420                         /* Set magn_val_addr to iio value address */
 421                         st->magn_val_addr[i] = &(st->iio_vals[*chan_count]);
 422                         magn_3d_adjust_channel_bit_mask(_channels,
 423                                                         *chan_count,
 424                                                         st->magn[i].size);
 425                         (*chan_count)++;
 426                 }
 427         }
 428
 429         if (*chan_count <= 0) {
 430                 dev_err(&pdev->dev,
 431                         "failed to find any magnetic channels setup\n");
 432                 return -EINVAL;
 433         }
 434
 435         *channels = _channels;
 436
 437         dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n",
 438                         *chan_count);
 439
 440         st->magn_flux_attr.scale_precision = hid_sensor_format_scale(
 441                                 HID_USAGE_SENSOR_COMPASS_3D,
 442                                 &st->magn[CHANNEL_SCAN_INDEX_X],
 443                                 &st->magn_flux_attr.scale_pre_decml,
 444                                 &st->magn_flux_attr.scale_post_decml);
 445         st->rot_attr.scale_precision
 446                 = hid_sensor_format_scale(
 447                         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
 448                         &st->magn[CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP],
 449                         &st->rot_attr.scale_pre_decml,
 450                         &st->rot_attr.scale_post_decml);
 451
 452         /* Set Sensitivity field ids, when there is no individual modifier */
 453         if (st->magn_flux_attributes.sensitivity.index < 0) {
 454                 sensor_hub_input_get_attribute_info(hsdev,
 455                         HID_FEATURE_REPORT, usage_id,
 456                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 457                         HID_USAGE_SENSOR_DATA_ORIENTATION,
 458                         &st->magn_flux_attributes.sensitivity);
 459                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 460                         st->magn_flux_attributes.sensitivity.index,
 461                         st->magn_flux_attributes.sensitivity.report_id);
 462         }
 463         if (st->magn_flux_attributes.sensitivity.index < 0) {
 464                 sensor_hub_input_get_attribute_info(hsdev,
 465                         HID_FEATURE_REPORT, usage_id,
 466                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 467                         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX,
 468                         &st->magn_flux_attributes.sensitivity);
 469                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 470                         st->magn_flux_attributes.sensitivity.index,
 471                         st->magn_flux_attributes.sensitivity.report_id);
 472         }
 473         if (st->rot_attributes.sensitivity.index < 0) {
 474                 sensor_hub_input_get_attribute_info(hsdev,
 475                         HID_FEATURE_REPORT, usage_id,
 476                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 477                         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
 478                         &st->rot_attributes.sensitivity);
 479                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 480                         st->rot_attributes.sensitivity.index,
 481                         st->rot_attributes.sensitivity.report_id);
 482         }
 483
 484         return 0;
 485 }
 486
 487 /* Function to initialize the processing for usage id */
 488 static int hid_magn_3d_probe(struct platform_device *pdev)
 489 {
 490         int ret = 0;
 491         static char *name = "magn_3d";
 492         struct iio_dev *indio_dev;
 493         struct magn_3d_state *magn_state;
 494         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 495         struct iio_chan_spec *channels;
 496         int chan_count = 0;
 497
 498         indio_dev = devm_iio_device_alloc(&pdev->dev,
 499                                           sizeof(struct magn_3d_state));
 500         if (indio_dev == NULL)
 501                 return -ENOMEM;
 502
 503         platform_set_drvdata(pdev, indio_dev);
 504
 505         magn_state = iio_priv(indio_dev);
 506         magn_state->magn_flux_attributes.hsdev = hsdev;
 507         magn_state->magn_flux_attributes.pdev = pdev;
 508
 509         ret = hid_sensor_parse_common_attributes(hsdev,
 510                                 HID_USAGE_SENSOR_COMPASS_3D,
 511                                 &magn_state->magn_flux_attributes);
 512         if (ret) {
 513                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 514                 return ret;
 515         }
 516         magn_state->rot_attributes = magn_state->magn_flux_attributes;
 517
 518         ret = magn_3d_parse_report(pdev, hsdev,
 519                                 &channels, &chan_count,
 520                                 HID_USAGE_SENSOR_COMPASS_3D, magn_state);
 521         if (ret) {
 522                 dev_err(&pdev->dev, "failed to parse report\n");
 523                 return ret;
 524         }
 525
 526         indio_dev->channels = channels;
 527         indio_dev->num_channels = chan_count;
 528         indio_dev->dev.parent = &pdev->dev;
 529         indio_dev->info = &magn_3d_info;
 530         indio_dev->name = name;
 531         indio_dev->modes = INDIO_DIRECT_MODE;
 532
 533         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 534                 NULL, NULL);
 535         if (ret) {
 536                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 537                 return ret;
 538         }
 539         atomic_set(&magn_state->magn_flux_attributes.data_ready, 0);
 540         ret = hid_sensor_setup_trigger(indio_dev, name,
 541                                         &magn_state->magn_flux_attributes);
 542         if (ret < 0) {
 543                 dev_err(&pdev->dev, "trigger setup failed\n");
 544                 goto error_unreg_buffer_funcs;
 545         }
 546
 547         ret = iio_device_register(indio_dev);
 548         if (ret) {
 549                 dev_err(&pdev->dev, "device register failed\n");
 550                 goto error_remove_trigger;
 551         }
 552
 553         magn_state->callbacks.send_event = magn_3d_proc_event;
 554         magn_state->callbacks.capture_sample = magn_3d_capture_sample;
 555         magn_state->callbacks.pdev = pdev;
 556         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
 557                                         &magn_state->callbacks);
 558         if (ret < 0) {
 559                 dev_err(&pdev->dev, "callback reg failed\n");
 560                 goto error_iio_unreg;
 561         }
 562
 563         return ret;
 564
 565 error_iio_unreg:
 566         iio_device_unregister(indio_dev);
 567 error_remove_trigger:
 568         hid_sensor_remove_trigger(&magn_state->magn_flux_attributes);
 569 error_unreg_buffer_funcs:
 570         iio_triggered_buffer_cleanup(indio_dev);
 571         return ret;
 572 }
 573
 574 /* Function to deinitialize the processing for usage id */
 575 static int hid_magn_3d_remove(struct platform_device *pdev)
 576 {
 577         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 578         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 579         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 580
 581         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
 582         iio_device_unregister(indio_dev);
 583         hid_sensor_remove_trigger(&magn_state->magn_flux_attributes);
 584         iio_triggered_buffer_cleanup(indio_dev);
 585
 586         return 0;
 587 }
 588
 589 static const struct platform_device_id hid_magn_3d_ids[] = {
 590         {
 591                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 592                 .name = "HID-SENSOR-200083",
 593         },
 594         { /* sentinel */ }
 595 };
 596 MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids);
 597
 598 static struct platform_driver hid_magn_3d_platform_driver = {
 599         .id_table = hid_magn_3d_ids,
 600         .driver = {
 601                 .name   = KBUILD_MODNAME,
 602                 .pm     = &hid_sensor_pm_ops,
 603         },
 604         .probe          = hid_magn_3d_probe,
 605         .remove         = hid_magn_3d_remove,
 606 };
 607 module_platform_driver(hid_magn_3d_platform_driver);
 608
 609 MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
 610 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 611 MODULE_LICENSE("GPL");