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