drivers/iio/accel/hid-sensor-accel-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 accel_3d_channel {
  35         CHANNEL_SCAN_INDEX_X,
  36         CHANNEL_SCAN_INDEX_Y,
  37         CHANNEL_SCAN_INDEX_Z,
  38         ACCEL_3D_CHANNEL_MAX,
  39 };
  40
  41 struct accel_3d_state {
  42         struct hid_sensor_hub_callbacks callbacks;
  43         struct hid_sensor_common common_attributes;
  44         struct hid_sensor_hub_attribute_info accel[ACCEL_3D_CHANNEL_MAX];
  45         /* Reserve for 3 channels + padding + timestamp */
  46         u32 accel_val[ACCEL_3D_CHANNEL_MAX + 3];
  47         int scale_pre_decml;
  48         int scale_post_decml;
  49         int scale_precision;
  50         int value_offset;
  51         int64_t timestamp;
  52 };
  53
  54 static const u32 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
  55         HID_USAGE_SENSOR_ACCEL_X_AXIS,
  56         HID_USAGE_SENSOR_ACCEL_Y_AXIS,
  57         HID_USAGE_SENSOR_ACCEL_Z_AXIS
  58 };
  59
  60 /* Channel definitions */
  61 static const struct iio_chan_spec accel_3d_channels[] = {
  62         {
  63                 .type = IIO_ACCEL,
  64                 .modified = 1,
  65                 .channel2 = IIO_MOD_X,
  66                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  67                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  68                 BIT(IIO_CHAN_INFO_SCALE) |
  69                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  70                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  71                 .scan_index = CHANNEL_SCAN_INDEX_X,
  72         }, {
  73                 .type = IIO_ACCEL,
  74                 .modified = 1,
  75                 .channel2 = IIO_MOD_Y,
  76                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  77                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  78                 BIT(IIO_CHAN_INFO_SCALE) |
  79                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  80                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  81                 .scan_index = CHANNEL_SCAN_INDEX_Y,
  82         }, {
  83                 .type = IIO_ACCEL,
  84                 .modified = 1,
  85                 .channel2 = IIO_MOD_Z,
  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                 .scan_index = CHANNEL_SCAN_INDEX_Z,
  92         },
  93         IIO_CHAN_SOFT_TIMESTAMP(3)
  94 };
  95
  96 /* Channel definitions */
  97 static const struct iio_chan_spec gravity_channels[] = {
  98         {
  99                 .type = IIO_GRAVITY,
 100                 .modified = 1,
 101                 .channel2 = IIO_MOD_X,
 102                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 103                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 104                 BIT(IIO_CHAN_INFO_SCALE) |
 105                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 106                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 107                 .scan_index = CHANNEL_SCAN_INDEX_X,
 108         }, {
 109                 .type = IIO_GRAVITY,
 110                 .modified = 1,
 111                 .channel2 = IIO_MOD_Y,
 112                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
 113                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
 114                 BIT(IIO_CHAN_INFO_SCALE) |
 115                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
 116                 BIT(IIO_CHAN_INFO_HYSTERESIS),
 117                 .scan_index = CHANNEL_SCAN_INDEX_Y,
 118         }, {
 119                 .type = IIO_GRAVITY,
 120                 .modified = 1,
 121                 .channel2 = IIO_MOD_Z,
 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                 .scan_index = CHANNEL_SCAN_INDEX_Z,
 128         }
 129 };
 130
 131 /* Adjust channel real bits based on report descriptor */
 132 static void accel_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
 133                                                 int channel, int size)
 134 {
 135         channels[channel].scan_type.sign = 's';
 136         /* Real storage bits will change based on the report desc. */
 137         channels[channel].scan_type.realbits = size * 8;
 138         /* Maximum size of a sample to capture is u32 */
 139         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
 140 }
 141
 142 /* Channel read_raw handler */
 143 static int accel_3d_read_raw(struct iio_dev *indio_dev,
 144                               struct iio_chan_spec const *chan,
 145                               int *val, int *val2,
 146                               long mask)
 147 {
 148         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 149         int report_id = -1;
 150         u32 address;
 151         int ret_type;
 152         struct hid_sensor_hub_device *hsdev =
 153                                         accel_state->common_attributes.hsdev;
 154
 155         *val = 0;
 156         *val2 = 0;
 157         switch (mask) {
 158         case 0:
 159                 hid_sensor_power_state(&accel_state->common_attributes, true);
 160                 report_id = accel_state->accel[chan->scan_index].report_id;
 161                 address = accel_3d_addresses[chan->scan_index];
 162                 if (report_id >= 0)
 163                         *val = sensor_hub_input_attr_get_raw_value(
 164                                         accel_state->common_attributes.hsdev,
 165                                         hsdev->usage, address, report_id,
 166                                         SENSOR_HUB_SYNC);
 167                 else {
 168                         *val = 0;
 169                         hid_sensor_power_state(&accel_state->common_attributes,
 170                                                  false);
 171                         return -EINVAL;
 172                 }
 173                 hid_sensor_power_state(&accel_state->common_attributes, false);
 174                 ret_type = IIO_VAL_INT;
 175                 break;
 176         case IIO_CHAN_INFO_SCALE:
 177                 *val = accel_state->scale_pre_decml;
 178                 *val2 = accel_state->scale_post_decml;
 179                 ret_type = accel_state->scale_precision;
 180                 break;
 181         case IIO_CHAN_INFO_OFFSET:
 182                 *val = accel_state->value_offset;
 183                 ret_type = IIO_VAL_INT;
 184                 break;
 185         case IIO_CHAN_INFO_SAMP_FREQ:
 186                 ret_type = hid_sensor_read_samp_freq_value(
 187                         &accel_state->common_attributes, val, val2);
 188                 break;
 189         case IIO_CHAN_INFO_HYSTERESIS:
 190                 ret_type = hid_sensor_read_raw_hyst_value(
 191                         &accel_state->common_attributes, val, val2);
 192                 break;
 193         default:
 194                 ret_type = -EINVAL;
 195                 break;
 196         }
 197
 198         return ret_type;
 199 }
 200
 201 /* Channel write_raw handler */
 202 static int accel_3d_write_raw(struct iio_dev *indio_dev,
 203                                struct iio_chan_spec const *chan,
 204                                int val,
 205                                int val2,
 206                                long mask)
 207 {
 208         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 209         int ret = 0;
 210
 211         switch (mask) {
 212         case IIO_CHAN_INFO_SAMP_FREQ:
 213                 ret = hid_sensor_write_samp_freq_value(
 214                                 &accel_state->common_attributes, val, val2);
 215                 break;
 216         case IIO_CHAN_INFO_HYSTERESIS:
 217                 ret = hid_sensor_write_raw_hyst_value(
 218                                 &accel_state->common_attributes, val, val2);
 219                 break;
 220         default:
 221                 ret = -EINVAL;
 222         }
 223
 224         return ret;
 225 }
 226
 227 static const struct iio_info accel_3d_info = {
 228         .driver_module = THIS_MODULE,
 229         .read_raw = &accel_3d_read_raw,
 230         .write_raw = &accel_3d_write_raw,
 231 };
 232
 233 /* Function to push data to buffer */
 234 static void hid_sensor_push_data(struct iio_dev *indio_dev, void *data,
 235                                  int len, int64_t timestamp)
 236 {
 237         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 238         iio_push_to_buffers_with_timestamp(indio_dev, data, timestamp);
 239 }
 240
 241 /* Callback handler to send event after all samples are received and captured */
 242 static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 243                                 unsigned usage_id,
 244                                 void *priv)
 245 {
 246         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 247         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 248
 249         dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
 250         if (atomic_read(&accel_state->common_attributes.data_ready)) {
 251                 if (!accel_state->timestamp)
 252                         accel_state->timestamp = iio_get_time_ns(indio_dev);
 253
 254                 hid_sensor_push_data(indio_dev,
 255                                      accel_state->accel_val,
 256                                      sizeof(accel_state->accel_val),
 257                                      accel_state->timestamp);
 258
 259                 accel_state->timestamp = 0;
 260         }
 261
 262         return 0;
 263 }
 264
 265 /* Capture samples in local storage */
 266 static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 267                                 unsigned usage_id,
 268                                 size_t raw_len, char *raw_data,
 269                                 void *priv)
 270 {
 271         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 272         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 273         int offset;
 274         int ret = -EINVAL;
 275
 276         switch (usage_id) {
 277         case HID_USAGE_SENSOR_ACCEL_X_AXIS:
 278         case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
 279         case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
 280                 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
 281                 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
 282                                                 *(u32 *)raw_data;
 283                 ret = 0;
 284         break;
 285         case HID_USAGE_SENSOR_TIME_TIMESTAMP:
 286                 accel_state->timestamp =
 287                         hid_sensor_convert_timestamp(
 288                                         &accel_state->common_attributes,
 289                                         *(int64_t *)raw_data);
 290         break;
 291         default:
 292                 break;
 293         }
 294
 295         return ret;
 296 }
 297
 298 /* Parse report which is specific to an usage id*/
 299 static int accel_3d_parse_report(struct platform_device *pdev,
 300                                 struct hid_sensor_hub_device *hsdev,
 301                                 struct iio_chan_spec *channels,
 302                                 unsigned usage_id,
 303                                 struct accel_3d_state *st)
 304 {
 305         int ret;
 306         int i;
 307
 308         for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
 309                 ret = sensor_hub_input_get_attribute_info(hsdev,
 310                                 HID_INPUT_REPORT,
 311                                 usage_id,
 312                                 HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
 313                                 &st->accel[CHANNEL_SCAN_INDEX_X + i]);
 314                 if (ret < 0)
 315                         break;
 316                 accel_3d_adjust_channel_bit_mask(channels,
 317                                 CHANNEL_SCAN_INDEX_X + i,
 318                                 st->accel[CHANNEL_SCAN_INDEX_X + i].size);
 319         }
 320         dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
 321                         st->accel[0].index,
 322                         st->accel[0].report_id,
 323                         st->accel[1].index, st->accel[1].report_id,
 324                         st->accel[2].index, st->accel[2].report_id);
 325
 326         st->scale_precision = hid_sensor_format_scale(
 327                                 hsdev->usage,
 328                                 &st->accel[CHANNEL_SCAN_INDEX_X],
 329                                 &st->scale_pre_decml, &st->scale_post_decml);
 330
 331         /* Set Sensitivity field ids, when there is no individual modifier */
 332         if (st->common_attributes.sensitivity.index < 0) {
 333                 sensor_hub_input_get_attribute_info(hsdev,
 334                         HID_FEATURE_REPORT, usage_id,
 335                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 336                         HID_USAGE_SENSOR_DATA_ACCELERATION,
 337                         &st->common_attributes.sensitivity);
 338                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 339                         st->common_attributes.sensitivity.index,
 340                         st->common_attributes.sensitivity.report_id);
 341         }
 342
 343         return ret;
 344 }
 345
 346 /* Function to initialize the processing for usage id */
 347 static int hid_accel_3d_probe(struct platform_device *pdev)
 348 {
 349         int ret = 0;
 350         static const char *name;
 351         struct iio_dev *indio_dev;
 352         struct accel_3d_state *accel_state;
 353         const struct iio_chan_spec *channel_spec;
 354         int channel_size;
 355
 356         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 357
 358         indio_dev = devm_iio_device_alloc(&pdev->dev,
 359                                           sizeof(struct accel_3d_state));
 360         if (indio_dev == NULL)
 361                 return -ENOMEM;
 362
 363         platform_set_drvdata(pdev, indio_dev);
 364
 365         accel_state = iio_priv(indio_dev);
 366         accel_state->common_attributes.hsdev = hsdev;
 367         accel_state->common_attributes.pdev = pdev;
 368
 369         if (hsdev->usage == HID_USAGE_SENSOR_ACCEL_3D) {
 370                 name = "accel_3d";
 371                 channel_spec = accel_3d_channels;
 372                 channel_size = sizeof(accel_3d_channels);
 373         } else {
 374                 name = "gravity";
 375                 channel_spec = gravity_channels;
 376                 channel_size = sizeof(gravity_channels);
 377         }
 378         ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
 379                                         &accel_state->common_attributes);
 380         if (ret) {
 381                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 382                 return ret;
 383         }
 384         indio_dev->channels = kmemdup(channel_spec, channel_size, GFP_KERNEL);
 385
 386         if (!indio_dev->channels) {
 387                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 388                 return -ENOMEM;
 389         }
 390         ret = accel_3d_parse_report(pdev, hsdev,
 391                                 (struct iio_chan_spec *)indio_dev->channels,
 392                                 hsdev->usage, accel_state);
 393         if (ret) {
 394                 dev_err(&pdev->dev, "failed to setup attributes\n");
 395                 goto error_free_dev_mem;
 396         }
 397
 398         indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
 399         indio_dev->dev.parent = &pdev->dev;
 400         indio_dev->info = &accel_3d_info;
 401         indio_dev->name = name;
 402         indio_dev->modes = INDIO_DIRECT_MODE;
 403
 404         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 405                 NULL, NULL);
 406         if (ret) {
 407                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 408                 goto error_free_dev_mem;
 409         }
 410         atomic_set(&accel_state->common_attributes.data_ready, 0);
 411         ret = hid_sensor_setup_trigger(indio_dev, name,
 412                                         &accel_state->common_attributes);
 413         if (ret < 0) {
 414                 dev_err(&pdev->dev, "trigger setup failed\n");
 415                 goto error_unreg_buffer_funcs;
 416         }
 417
 418         ret = iio_device_register(indio_dev);
 419         if (ret) {
 420                 dev_err(&pdev->dev, "device register failed\n");
 421                 goto error_remove_trigger;
 422         }
 423
 424         accel_state->callbacks.send_event = accel_3d_proc_event;
 425         accel_state->callbacks.capture_sample = accel_3d_capture_sample;
 426         accel_state->callbacks.pdev = pdev;
 427         ret = sensor_hub_register_callback(hsdev, hsdev->usage,
 428                                         &accel_state->callbacks);
 429         if (ret < 0) {
 430                 dev_err(&pdev->dev, "callback reg failed\n");
 431                 goto error_iio_unreg;
 432         }
 433
 434         return ret;
 435
 436 error_iio_unreg:
 437         iio_device_unregister(indio_dev);
 438 error_remove_trigger:
 439         hid_sensor_remove_trigger(&accel_state->common_attributes);
 440 error_unreg_buffer_funcs:
 441         iio_triggered_buffer_cleanup(indio_dev);
 442 error_free_dev_mem:
 443         kfree(indio_dev->channels);
 444         return ret;
 445 }
 446
 447 /* Function to deinitialize the processing for usage id */
 448 static int hid_accel_3d_remove(struct platform_device *pdev)
 449 {
 450         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 451         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 452         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 453
 454         sensor_hub_remove_callback(hsdev, hsdev->usage);
 455         iio_device_unregister(indio_dev);
 456         hid_sensor_remove_trigger(&accel_state->common_attributes);
 457         iio_triggered_buffer_cleanup(indio_dev);
 458         kfree(indio_dev->channels);
 459
 460         return 0;
 461 }
 462
 463 static const struct platform_device_id hid_accel_3d_ids[] = {
 464         {
 465                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 466                 .name = "HID-SENSOR-200073",
 467         },
 468         {       /* gravity sensor */
 469                 .name = "HID-SENSOR-20007b",
 470         },
 471         { /* sentinel */ }
 472 };
 473 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
 474
 475 static struct platform_driver hid_accel_3d_platform_driver = {
 476         .id_table = hid_accel_3d_ids,
 477         .driver = {
 478                 .name   = KBUILD_MODNAME,
 479                 .pm     = &hid_sensor_pm_ops,
 480         },
 481         .probe          = hid_accel_3d_probe,
 482         .remove         = hid_accel_3d_remove,
 483 };
 484 module_platform_driver(hid_accel_3d_platform_driver);
 485
 486 MODULE_DESCRIPTION("HID Sensor Accel 3D");
 487 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 488 MODULE_LICENSE("GPL");