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         s32 min;
 167
 168         *val = 0;
 169         *val2 = 0;
 170         switch (mask) {
 171         case IIO_CHAN_INFO_RAW:
 172                 hid_sensor_power_state(&magn_state->magn_flux_attributes, true);
 173                 report_id = magn_state->magn[chan->address].report_id;
 174                 min = magn_state->magn[chan->address].logical_minimum;
 175                 address = magn_3d_addresses[chan->address];
 176                 if (report_id >= 0)
 177                         *val = sensor_hub_input_attr_get_raw_value(
 178                                 magn_state->magn_flux_attributes.hsdev,
 179                                 HID_USAGE_SENSOR_COMPASS_3D, address,
 180                                 report_id,
 181                                 SENSOR_HUB_SYNC,
 182                                 min < 0);
 183                 else {
 184                         *val = 0;
 185                         hid_sensor_power_state(
 186                                 &magn_state->magn_flux_attributes,
 187                                 false);
 188                         return -EINVAL;
 189                 }
 190                 hid_sensor_power_state(&magn_state->magn_flux_attributes,
 191                                         false);
 192                 ret_type = IIO_VAL_INT;
 193                 break;
 194         case IIO_CHAN_INFO_SCALE:
 195                 switch (chan->type) {
 196                 case IIO_MAGN:
 197                         *val = magn_state->magn_flux_attr.scale_pre_decml;
 198                         *val2 = magn_state->magn_flux_attr.scale_post_decml;
 199                         ret_type = magn_state->magn_flux_attr.scale_precision;
 200                         break;
 201                 case IIO_ROT:
 202                         *val = magn_state->rot_attr.scale_pre_decml;
 203                         *val2 = magn_state->rot_attr.scale_post_decml;
 204                         ret_type = magn_state->rot_attr.scale_precision;
 205                         break;
 206                 default:
 207                         ret_type = -EINVAL;
 208                 }
 209                 break;
 210         case IIO_CHAN_INFO_OFFSET:
 211                 switch (chan->type) {
 212                 case IIO_MAGN:
 213                         *val = magn_state->magn_flux_attr.value_offset;
 214                         ret_type = IIO_VAL_INT;
 215                         break;
 216                 case IIO_ROT:
 217                         *val = magn_state->rot_attr.value_offset;
 218                         ret_type = IIO_VAL_INT;
 219                         break;
 220                 default:
 221                         ret_type = -EINVAL;
 222                 }
 223                 break;
 224         case IIO_CHAN_INFO_SAMP_FREQ:
 225                 ret_type = hid_sensor_read_samp_freq_value(
 226                         &magn_state->magn_flux_attributes, val, val2);
 227                 break;
 228         case IIO_CHAN_INFO_HYSTERESIS:
 229                 switch (chan->type) {
 230                 case IIO_MAGN:
 231                         ret_type = hid_sensor_read_raw_hyst_value(
 232                                 &magn_state->magn_flux_attributes, val, val2);
 233                         break;
 234                 case IIO_ROT:
 235                         ret_type = hid_sensor_read_raw_hyst_value(
 236                                 &magn_state->rot_attributes, val, val2);
 237                         break;
 238                 default:
 239                         ret_type = -EINVAL;
 240                 }
 241                 break;
 242         default:
 243                 ret_type = -EINVAL;
 244                 break;
 245         }
 246
 247         return ret_type;
 248 }
 249
 250 /* Channel write_raw handler */
 251 static int magn_3d_write_raw(struct iio_dev *indio_dev,
 252                                struct iio_chan_spec const *chan,
 253                                int val,
 254                                int val2,
 255                                long mask)
 256 {
 257         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 258         int ret = 0;
 259
 260         switch (mask) {
 261         case IIO_CHAN_INFO_SAMP_FREQ:
 262                 ret = hid_sensor_write_samp_freq_value(
 263                                 &magn_state->magn_flux_attributes, val, val2);
 264                 break;
 265         case IIO_CHAN_INFO_HYSTERESIS:
 266                 switch (chan->type) {
 267                 case IIO_MAGN:
 268                         ret = hid_sensor_write_raw_hyst_value(
 269                                 &magn_state->magn_flux_attributes, val, val2);
 270                         break;
 271                 case IIO_ROT:
 272                         ret = hid_sensor_write_raw_hyst_value(
 273                                 &magn_state->rot_attributes, val, val2);
 274                         break;
 275                 default:
 276                         ret = -EINVAL;
 277                 }
 278                 break;
 279         default:
 280                 ret = -EINVAL;
 281         }
 282
 283         return ret;
 284 }
 285
 286 static const struct iio_info magn_3d_info = {
 287         .read_raw = &magn_3d_read_raw,
 288         .write_raw = &magn_3d_write_raw,
 289 };
 290
 291 /* Function to push data to buffer */
 292 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data)
 293 {
 294         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 295         iio_push_to_buffers(indio_dev, data);
 296 }
 297
 298 /* Callback handler to send event after all samples are received and captured */
 299 static int magn_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 300                                 unsigned usage_id,
 301                                 void *priv)
 302 {
 303         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 304         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 305
 306         dev_dbg(&indio_dev->dev, "magn_3d_proc_event\n");
 307         if (atomic_read(&magn_state->magn_flux_attributes.data_ready))
 308                 hid_sensor_push_data(indio_dev, magn_state->iio_vals);
 309
 310         return 0;
 311 }
 312
 313 /* Capture samples in local storage */
 314 static int magn_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 315                                 unsigned usage_id,
 316                                 size_t raw_len, char *raw_data,
 317                                 void *priv)
 318 {
 319         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 320         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 321         int offset;
 322         int ret = 0;
 323         u32 *iio_val = NULL;
 324
 325         switch (usage_id) {
 326         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS:
 327         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Y_AXIS:
 328         case HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_Z_AXIS:
 329                 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_MAGN_FLUX_X_AXIS)
 330                                 + CHANNEL_SCAN_INDEX_X;
 331         break;
 332         case HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH:
 333         case HID_USAGE_SENSOR_ORIENT_COMP_TRUE_NORTH:
 334         case HID_USAGE_SENSOR_ORIENT_MAGN_NORTH:
 335         case HID_USAGE_SENSOR_ORIENT_TRUE_NORTH:
 336                 offset = (usage_id - HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH)
 337                                 + CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP;
 338         break;
 339         default:
 340                 return -EINVAL;
 341         }
 342
 343         iio_val = magn_state->magn_val_addr[offset];
 344
 345         if (iio_val != NULL)
 346                 *iio_val = *((u32 *)raw_data);
 347         else
 348                 ret = -EINVAL;
 349
 350         return ret;
 351 }
 352
 353 /* Parse report which is specific to an usage id*/
 354 static int magn_3d_parse_report(struct platform_device *pdev,
 355                                 struct hid_sensor_hub_device *hsdev,
 356                                 struct iio_chan_spec **channels,
 357                                 int *chan_count,
 358                                 unsigned usage_id,
 359                                 struct magn_3d_state *st)
 360 {
 361         int i;
 362         int attr_count = 0;
 363         struct iio_chan_spec *_channels;
 364
 365         /* Scan for each usage attribute supported */
 366         for (i = 0; i < MAGN_3D_CHANNEL_MAX; i++) {
 367                 int status;
 368                 u32 address = magn_3d_addresses[i];
 369
 370                 /* Check if usage attribute exists in the sensor hub device */
 371                 status = sensor_hub_input_get_attribute_info(hsdev,
 372                         HID_INPUT_REPORT,
 373                         usage_id,
 374                         address,
 375                         &(st->magn[i]));
 376                 if (!status)
 377                         attr_count++;
 378         }
 379
 380         if (attr_count <= 0) {
 381                 dev_err(&pdev->dev,
 382                         "failed to find any supported usage attributes in report\n");
 383                 return  -EINVAL;
 384         }
 385
 386         dev_dbg(&pdev->dev, "magn_3d Found %d usage attributes\n",
 387                         attr_count);
 388         dev_dbg(&pdev->dev, "magn_3d X: %x:%x Y: %x:%x Z: %x:%x\n",
 389                         st->magn[0].index,
 390                         st->magn[0].report_id,
 391                         st->magn[1].index, st->magn[1].report_id,
 392                         st->magn[2].index, st->magn[2].report_id);
 393
 394         /* Setup IIO channel array */
 395         _channels = devm_kcalloc(&pdev->dev, attr_count,
 396                                 sizeof(struct iio_chan_spec),
 397                                 GFP_KERNEL);
 398         if (!_channels) {
 399                 dev_err(&pdev->dev,
 400                         "failed to allocate space for iio channels\n");
 401                 return -ENOMEM;
 402         }
 403
 404         st->iio_vals = devm_kcalloc(&pdev->dev, attr_count,
 405                                 sizeof(u32),
 406                                 GFP_KERNEL);
 407         if (!st->iio_vals) {
 408                 dev_err(&pdev->dev,
 409                         "failed to allocate space for iio values array\n");
 410                 return -ENOMEM;
 411         }
 412
 413         for (i = 0, *chan_count = 0;
 414         i < MAGN_3D_CHANNEL_MAX && *chan_count < attr_count;
 415         i++){
 416                 if (st->magn[i].index >= 0) {
 417                         /* Setup IIO channel struct */
 418                         (_channels[*chan_count]) = magn_3d_channels[i];
 419                         (_channels[*chan_count]).scan_index = *chan_count;
 420                         (_channels[*chan_count]).address = i;
 421
 422                         /* Set magn_val_addr to iio value address */
 423                         st->magn_val_addr[i] = &(st->iio_vals[*chan_count]);
 424                         magn_3d_adjust_channel_bit_mask(_channels,
 425                                                         *chan_count,
 426                                                         st->magn[i].size);
 427                         (*chan_count)++;
 428                 }
 429         }
 430
 431         if (*chan_count <= 0) {
 432                 dev_err(&pdev->dev,
 433                         "failed to find any magnetic channels setup\n");
 434                 return -EINVAL;
 435         }
 436
 437         *channels = _channels;
 438
 439         dev_dbg(&pdev->dev, "magn_3d Setup %d IIO channels\n",
 440                         *chan_count);
 441
 442         st->magn_flux_attr.scale_precision = hid_sensor_format_scale(
 443                                 HID_USAGE_SENSOR_COMPASS_3D,
 444                                 &st->magn[CHANNEL_SCAN_INDEX_X],
 445                                 &st->magn_flux_attr.scale_pre_decml,
 446                                 &st->magn_flux_attr.scale_post_decml);
 447         st->rot_attr.scale_precision
 448                 = hid_sensor_format_scale(
 449                         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
 450                         &st->magn[CHANNEL_SCAN_INDEX_NORTH_MAGN_TILT_COMP],
 451                         &st->rot_attr.scale_pre_decml,
 452                         &st->rot_attr.scale_post_decml);
 453
 454         /* Set Sensitivity field ids, when there is no individual modifier */
 455         if (st->magn_flux_attributes.sensitivity.index < 0) {
 456                 sensor_hub_input_get_attribute_info(hsdev,
 457                         HID_FEATURE_REPORT, usage_id,
 458                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 459                         HID_USAGE_SENSOR_DATA_ORIENTATION,
 460                         &st->magn_flux_attributes.sensitivity);
 461                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 462                         st->magn_flux_attributes.sensitivity.index,
 463                         st->magn_flux_attributes.sensitivity.report_id);
 464         }
 465         if (st->magn_flux_attributes.sensitivity.index < 0) {
 466                 sensor_hub_input_get_attribute_info(hsdev,
 467                         HID_FEATURE_REPORT, usage_id,
 468                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 469                         HID_USAGE_SENSOR_ORIENT_MAGN_FLUX,
 470                         &st->magn_flux_attributes.sensitivity);
 471                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 472                         st->magn_flux_attributes.sensitivity.index,
 473                         st->magn_flux_attributes.sensitivity.report_id);
 474         }
 475         if (st->rot_attributes.sensitivity.index < 0) {
 476                 sensor_hub_input_get_attribute_info(hsdev,
 477                         HID_FEATURE_REPORT, usage_id,
 478                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 479                         HID_USAGE_SENSOR_ORIENT_COMP_MAGN_NORTH,
 480                         &st->rot_attributes.sensitivity);
 481                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 482                         st->rot_attributes.sensitivity.index,
 483                         st->rot_attributes.sensitivity.report_id);
 484         }
 485
 486         return 0;
 487 }
 488
 489 /* Function to initialize the processing for usage id */
 490 static int hid_magn_3d_probe(struct platform_device *pdev)
 491 {
 492         int ret = 0;
 493         static char *name = "magn_3d";
 494         struct iio_dev *indio_dev;
 495         struct magn_3d_state *magn_state;
 496         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 497         struct iio_chan_spec *channels;
 498         int chan_count = 0;
 499
 500         indio_dev = devm_iio_device_alloc(&pdev->dev,
 501                                           sizeof(struct magn_3d_state));
 502         if (indio_dev == NULL)
 503                 return -ENOMEM;
 504
 505         platform_set_drvdata(pdev, indio_dev);
 506
 507         magn_state = iio_priv(indio_dev);
 508         magn_state->magn_flux_attributes.hsdev = hsdev;
 509         magn_state->magn_flux_attributes.pdev = pdev;
 510
 511         ret = hid_sensor_parse_common_attributes(hsdev,
 512                                 HID_USAGE_SENSOR_COMPASS_3D,
 513                                 &magn_state->magn_flux_attributes);
 514         if (ret) {
 515                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 516                 return ret;
 517         }
 518         magn_state->rot_attributes = magn_state->magn_flux_attributes;
 519
 520         ret = magn_3d_parse_report(pdev, hsdev,
 521                                 &channels, &chan_count,
 522                                 HID_USAGE_SENSOR_COMPASS_3D, magn_state);
 523         if (ret) {
 524                 dev_err(&pdev->dev, "failed to parse report\n");
 525                 return ret;
 526         }
 527
 528         indio_dev->channels = channels;
 529         indio_dev->num_channels = chan_count;
 530         indio_dev->dev.parent = &pdev->dev;
 531         indio_dev->info = &magn_3d_info;
 532         indio_dev->name = name;
 533         indio_dev->modes = INDIO_DIRECT_MODE;
 534
 535         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 536                 NULL, NULL);
 537         if (ret) {
 538                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 539                 return ret;
 540         }
 541         atomic_set(&magn_state->magn_flux_attributes.data_ready, 0);
 542         ret = hid_sensor_setup_trigger(indio_dev, name,
 543                                         &magn_state->magn_flux_attributes);
 544         if (ret < 0) {
 545                 dev_err(&pdev->dev, "trigger setup failed\n");
 546                 goto error_unreg_buffer_funcs;
 547         }
 548
 549         ret = iio_device_register(indio_dev);
 550         if (ret) {
 551                 dev_err(&pdev->dev, "device register failed\n");
 552                 goto error_remove_trigger;
 553         }
 554
 555         magn_state->callbacks.send_event = magn_3d_proc_event;
 556         magn_state->callbacks.capture_sample = magn_3d_capture_sample;
 557         magn_state->callbacks.pdev = pdev;
 558         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D,
 559                                         &magn_state->callbacks);
 560         if (ret < 0) {
 561                 dev_err(&pdev->dev, "callback reg failed\n");
 562                 goto error_iio_unreg;
 563         }
 564
 565         return ret;
 566
 567 error_iio_unreg:
 568         iio_device_unregister(indio_dev);
 569 error_remove_trigger:
 570         hid_sensor_remove_trigger(&magn_state->magn_flux_attributes);
 571 error_unreg_buffer_funcs:
 572         iio_triggered_buffer_cleanup(indio_dev);
 573         return ret;
 574 }
 575
 576 /* Function to deinitialize the processing for usage id */
 577 static int hid_magn_3d_remove(struct platform_device *pdev)
 578 {
 579         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 580         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 581         struct magn_3d_state *magn_state = iio_priv(indio_dev);
 582
 583         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_COMPASS_3D);
 584         iio_device_unregister(indio_dev);
 585         hid_sensor_remove_trigger(&magn_state->magn_flux_attributes);
 586         iio_triggered_buffer_cleanup(indio_dev);
 587
 588         return 0;
 589 }
 590
 591 static const struct platform_device_id hid_magn_3d_ids[] = {
 592         {
 593                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 594                 .name = "HID-SENSOR-200083",
 595         },
 596         { /* sentinel */ }
 597 };
 598 MODULE_DEVICE_TABLE(platform, hid_magn_3d_ids);
 599
 600 static struct platform_driver hid_magn_3d_platform_driver = {
 601         .id_table = hid_magn_3d_ids,
 602         .driver = {
 603                 .name   = KBUILD_MODNAME,
 604                 .pm     = &hid_sensor_pm_ops,
 605         },
 606         .probe          = hid_magn_3d_probe,
 607         .remove         = hid_magn_3d_remove,
 608 };
 609 module_platform_driver(hid_magn_3d_platform_driver);
 610
 611 MODULE_DESCRIPTION("HID Sensor Magnetometer 3D");
 612 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 613 MODULE_LICENSE("GPL");