drivers/iio/orientation/hid-sensor-incl-3d.c

   1 /*
   2  * HID Sensors Driver
   3  * Copyright (c) 2013, 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  *
  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 incl_3d_channel {
  35         CHANNEL_SCAN_INDEX_X,
  36         CHANNEL_SCAN_INDEX_Y,
  37         CHANNEL_SCAN_INDEX_Z,
  38         INCLI_3D_CHANNEL_MAX,
  39 };
  40
  41 struct incl_3d_state {
  42         struct hid_sensor_hub_callbacks callbacks;
  43         struct hid_sensor_common common_attributes;
  44         struct hid_sensor_hub_attribute_info incl[INCLI_3D_CHANNEL_MAX];
  45         u32 incl_val[INCLI_3D_CHANNEL_MAX];
  46         int scale_pre_decml;
  47         int scale_post_decml;
  48         int scale_precision;
  49         int value_offset;
  50 };
  51
  52 static const u32 incl_3d_addresses[INCLI_3D_CHANNEL_MAX] = {
  53         HID_USAGE_SENSOR_ORIENT_TILT_X,
  54         HID_USAGE_SENSOR_ORIENT_TILT_Y,
  55         HID_USAGE_SENSOR_ORIENT_TILT_Z
  56 };
  57
  58 /* Channel definitions */
  59 static const struct iio_chan_spec incl_3d_channels[] = {
  60         {
  61                 .type = IIO_INCLI,
  62                 .modified = 1,
  63                 .channel2 = IIO_MOD_X,
  64                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  65                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  66                 BIT(IIO_CHAN_INFO_SCALE) |
  67                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  68                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  69                 .scan_index = CHANNEL_SCAN_INDEX_X,
  70         }, {
  71                 .type = IIO_INCLI,
  72                 .modified = 1,
  73                 .channel2 = IIO_MOD_Y,
  74                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  75                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  76                 BIT(IIO_CHAN_INFO_SCALE) |
  77                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  78                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  79                 .scan_index = CHANNEL_SCAN_INDEX_Y,
  80         }, {
  81                 .type = IIO_INCLI,
  82                 .modified = 1,
  83                 .channel2 = IIO_MOD_Z,
  84                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  85                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  86                 BIT(IIO_CHAN_INFO_SCALE) |
  87                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  88                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  89                 .scan_index = CHANNEL_SCAN_INDEX_Z,
  90         }
  91 };
  92
  93 /* Adjust channel real bits based on report descriptor */
  94 static void incl_3d_adjust_channel_bit_mask(struct iio_chan_spec *chan,
  95                                                 int size)
  96 {
  97         chan->scan_type.sign = 's';
  98         /* Real storage bits will change based on the report desc. */
  99         chan->scan_type.realbits = size * 8;
 100         /* Maximum size of a sample to capture is u32 */
 101         chan->scan_type.storagebits = sizeof(u32) * 8;
 102 }
 103
 104 /* Channel read_raw handler */
 105 static int incl_3d_read_raw(struct iio_dev *indio_dev,
 106                               struct iio_chan_spec const *chan,
 107                               int *val, int *val2,
 108                               long mask)
 109 {
 110         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 111         int report_id = -1;
 112         u32 address;
 113         int ret_type;
 114
 115         *val = 0;
 116         *val2 = 0;
 117         switch (mask) {
 118         case IIO_CHAN_INFO_RAW:
 119                 hid_sensor_power_state(&incl_state->common_attributes, true);
 120                 report_id =
 121                         incl_state->incl[chan->scan_index].report_id;
 122                 address = incl_3d_addresses[chan->scan_index];
 123                 if (report_id >= 0)
 124                         *val = sensor_hub_input_attr_get_raw_value(
 125                                 incl_state->common_attributes.hsdev,
 126                                 HID_USAGE_SENSOR_INCLINOMETER_3D, address,
 127                                 report_id,
 128                                 SENSOR_HUB_SYNC);
 129                 else {
 130                         hid_sensor_power_state(&incl_state->common_attributes,
 131                                                 false);
 132                         return -EINVAL;
 133                 }
 134                 hid_sensor_power_state(&incl_state->common_attributes, false);
 135                 ret_type = IIO_VAL_INT;
 136                 break;
 137         case IIO_CHAN_INFO_SCALE:
 138                 *val = incl_state->scale_pre_decml;
 139                 *val2 = incl_state->scale_post_decml;
 140                 ret_type = incl_state->scale_precision;
 141                 break;
 142         case IIO_CHAN_INFO_OFFSET:
 143                 *val = incl_state->value_offset;
 144                 ret_type = IIO_VAL_INT;
 145                 break;
 146         case IIO_CHAN_INFO_SAMP_FREQ:
 147                 ret_type = hid_sensor_read_samp_freq_value(
 148                         &incl_state->common_attributes, val, val2);
 149                 break;
 150         case IIO_CHAN_INFO_HYSTERESIS:
 151                 ret_type = hid_sensor_read_raw_hyst_value(
 152                         &incl_state->common_attributes, val, val2);
 153                 break;
 154         default:
 155                 ret_type = -EINVAL;
 156                 break;
 157         }
 158
 159         return ret_type;
 160 }
 161
 162 /* Channel write_raw handler */
 163 static int incl_3d_write_raw(struct iio_dev *indio_dev,
 164                                struct iio_chan_spec const *chan,
 165                                int val,
 166                                int val2,
 167                                long mask)
 168 {
 169         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 170         int ret;
 171
 172         switch (mask) {
 173         case IIO_CHAN_INFO_SAMP_FREQ:
 174                 ret = hid_sensor_write_samp_freq_value(
 175                                 &incl_state->common_attributes, val, val2);
 176                 break;
 177         case IIO_CHAN_INFO_HYSTERESIS:
 178                 ret = hid_sensor_write_raw_hyst_value(
 179                                 &incl_state->common_attributes, val, val2);
 180                 break;
 181         default:
 182                 ret = -EINVAL;
 183         }
 184
 185         return ret;
 186 }
 187
 188 static const struct iio_info incl_3d_info = {
 189         .driver_module = THIS_MODULE,
 190         .read_raw = &incl_3d_read_raw,
 191         .write_raw = &incl_3d_write_raw,
 192 };
 193
 194 /* Function to push data to buffer */
 195 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
 196 {
 197         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 198         iio_push_to_buffers(indio_dev, (u8 *)data);
 199 }
 200
 201 /* Callback handler to send event after all samples are received and captured */
 202 static int incl_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 203                                 unsigned usage_id,
 204                                 void *priv)
 205 {
 206         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 207         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 208
 209         dev_dbg(&indio_dev->dev, "incl_3d_proc_event\n");
 210         if (atomic_read(&incl_state->common_attributes.data_ready))
 211                 hid_sensor_push_data(indio_dev,
 212                                 (u8 *)incl_state->incl_val,
 213                                 sizeof(incl_state->incl_val));
 214
 215         return 0;
 216 }
 217
 218 /* Capture samples in local storage */
 219 static int incl_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 220                                 unsigned usage_id,
 221                                 size_t raw_len, char *raw_data,
 222                                 void *priv)
 223 {
 224         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 225         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 226         int ret = 0;
 227
 228         switch (usage_id) {
 229         case HID_USAGE_SENSOR_ORIENT_TILT_X:
 230                 incl_state->incl_val[CHANNEL_SCAN_INDEX_X] = *(u32 *)raw_data;
 231         break;
 232         case HID_USAGE_SENSOR_ORIENT_TILT_Y:
 233                 incl_state->incl_val[CHANNEL_SCAN_INDEX_Y] = *(u32 *)raw_data;
 234         break;
 235         case HID_USAGE_SENSOR_ORIENT_TILT_Z:
 236                 incl_state->incl_val[CHANNEL_SCAN_INDEX_Z] = *(u32 *)raw_data;
 237         break;
 238         default:
 239                 ret = -EINVAL;
 240                 break;
 241         }
 242
 243         return ret;
 244 }
 245
 246 /* Parse report which is specific to an usage id*/
 247 static int incl_3d_parse_report(struct platform_device *pdev,
 248                                 struct hid_sensor_hub_device *hsdev,
 249                                 struct iio_chan_spec *channels,
 250                                 unsigned usage_id,
 251                                 struct incl_3d_state *st)
 252 {
 253         int ret;
 254
 255         ret = sensor_hub_input_get_attribute_info(hsdev,
 256                                 HID_INPUT_REPORT,
 257                                 usage_id,
 258                                 HID_USAGE_SENSOR_ORIENT_TILT_X,
 259                                 &st->incl[CHANNEL_SCAN_INDEX_X]);
 260         if (ret)
 261                 return ret;
 262         incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_X],
 263                                 st->incl[CHANNEL_SCAN_INDEX_X].size);
 264
 265         ret = sensor_hub_input_get_attribute_info(hsdev,
 266                                 HID_INPUT_REPORT,
 267                                 usage_id,
 268                                 HID_USAGE_SENSOR_ORIENT_TILT_Y,
 269                                 &st->incl[CHANNEL_SCAN_INDEX_Y]);
 270         if (ret)
 271                 return ret;
 272         incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Y],
 273                                 st->incl[CHANNEL_SCAN_INDEX_Y].size);
 274
 275         ret = sensor_hub_input_get_attribute_info(hsdev,
 276                                 HID_INPUT_REPORT,
 277                                 usage_id,
 278                                 HID_USAGE_SENSOR_ORIENT_TILT_Z,
 279                                 &st->incl[CHANNEL_SCAN_INDEX_Z]);
 280         if (ret)
 281                 return ret;
 282         incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Z],
 283                                 st->incl[CHANNEL_SCAN_INDEX_Z].size);
 284
 285         dev_dbg(&pdev->dev, "incl_3d %x:%x, %x:%x, %x:%x\n",
 286                         st->incl[0].index,
 287                         st->incl[0].report_id,
 288                         st->incl[1].index, st->incl[1].report_id,
 289                         st->incl[2].index, st->incl[2].report_id);
 290
 291         st->scale_precision = hid_sensor_format_scale(
 292                                 HID_USAGE_SENSOR_INCLINOMETER_3D,
 293                                 &st->incl[CHANNEL_SCAN_INDEX_X],
 294                                 &st->scale_pre_decml, &st->scale_post_decml);
 295
 296         /* Set Sensitivity field ids, when there is no individual modifier */
 297         if (st->common_attributes.sensitivity.index < 0) {
 298                 sensor_hub_input_get_attribute_info(hsdev,
 299                         HID_FEATURE_REPORT, usage_id,
 300                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 301                         HID_USAGE_SENSOR_DATA_ORIENTATION,
 302                         &st->common_attributes.sensitivity);
 303                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 304                         st->common_attributes.sensitivity.index,
 305                         st->common_attributes.sensitivity.report_id);
 306         }
 307         return ret;
 308 }
 309
 310 /* Function to initialize the processing for usage id */
 311 static int hid_incl_3d_probe(struct platform_device *pdev)
 312 {
 313         int ret;
 314         static char *name = "incli_3d";
 315         struct iio_dev *indio_dev;
 316         struct incl_3d_state *incl_state;
 317         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 318
 319         indio_dev = devm_iio_device_alloc(&pdev->dev,
 320                                           sizeof(struct incl_3d_state));
 321         if (indio_dev == NULL)
 322                 return -ENOMEM;
 323
 324         platform_set_drvdata(pdev, indio_dev);
 325
 326         incl_state = iio_priv(indio_dev);
 327         incl_state->common_attributes.hsdev = hsdev;
 328         incl_state->common_attributes.pdev = pdev;
 329
 330         ret = hid_sensor_parse_common_attributes(hsdev,
 331                                 HID_USAGE_SENSOR_INCLINOMETER_3D,
 332                                 &incl_state->common_attributes);
 333         if (ret) {
 334                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 335                 return ret;
 336         }
 337
 338         indio_dev->channels = kmemdup(incl_3d_channels,
 339                                       sizeof(incl_3d_channels), GFP_KERNEL);
 340         if (!indio_dev->channels) {
 341                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 342                 return -ENOMEM;
 343         }
 344
 345         ret = incl_3d_parse_report(pdev, hsdev,
 346                                    (struct iio_chan_spec *)indio_dev->channels,
 347                                    HID_USAGE_SENSOR_INCLINOMETER_3D,
 348                                    incl_state);
 349         if (ret) {
 350                 dev_err(&pdev->dev, "failed to setup attributes\n");
 351                 goto error_free_dev_mem;
 352         }
 353
 354         indio_dev->num_channels = ARRAY_SIZE(incl_3d_channels);
 355         indio_dev->dev.parent = &pdev->dev;
 356         indio_dev->info = &incl_3d_info;
 357         indio_dev->name = name;
 358         indio_dev->modes = INDIO_DIRECT_MODE;
 359
 360         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 361                 NULL, NULL);
 362         if (ret) {
 363                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 364                 goto error_free_dev_mem;
 365         }
 366         atomic_set(&incl_state->common_attributes.data_ready, 0);
 367         ret = hid_sensor_setup_trigger(indio_dev, name,
 368                                         &incl_state->common_attributes);
 369         if (ret) {
 370                 dev_err(&pdev->dev, "trigger setup failed\n");
 371                 goto error_unreg_buffer_funcs;
 372         }
 373
 374         ret = iio_device_register(indio_dev);
 375         if (ret) {
 376                 dev_err(&pdev->dev, "device register failed\n");
 377                 goto error_remove_trigger;
 378         }
 379
 380         incl_state->callbacks.send_event = incl_3d_proc_event;
 381         incl_state->callbacks.capture_sample = incl_3d_capture_sample;
 382         incl_state->callbacks.pdev = pdev;
 383         ret = sensor_hub_register_callback(hsdev,
 384                                         HID_USAGE_SENSOR_INCLINOMETER_3D,
 385                                         &incl_state->callbacks);
 386         if (ret) {
 387                 dev_err(&pdev->dev, "callback reg failed\n");
 388                 goto error_iio_unreg;
 389         }
 390
 391         return 0;
 392
 393 error_iio_unreg:
 394         iio_device_unregister(indio_dev);
 395 error_remove_trigger:
 396         hid_sensor_remove_trigger(&incl_state->common_attributes);
 397 error_unreg_buffer_funcs:
 398         iio_triggered_buffer_cleanup(indio_dev);
 399 error_free_dev_mem:
 400         kfree(indio_dev->channels);
 401         return ret;
 402 }
 403
 404 /* Function to deinitialize the processing for usage id */
 405 static int hid_incl_3d_remove(struct platform_device *pdev)
 406 {
 407         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 408         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 409         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 410
 411         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_INCLINOMETER_3D);
 412         iio_device_unregister(indio_dev);
 413         hid_sensor_remove_trigger(&incl_state->common_attributes);
 414         iio_triggered_buffer_cleanup(indio_dev);
 415         kfree(indio_dev->channels);
 416
 417         return 0;
 418 }
 419
 420 static const struct platform_device_id hid_incl_3d_ids[] = {
 421         {
 422                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 423                 .name = "HID-SENSOR-200086",
 424         },
 425         { /* sentinel */ }
 426 };
 427 MODULE_DEVICE_TABLE(platform, hid_incl_3d_ids);
 428
 429 static struct platform_driver hid_incl_3d_platform_driver = {
 430         .id_table = hid_incl_3d_ids,
 431         .driver = {
 432                 .name   = KBUILD_MODNAME,
 433                 .pm     = &hid_sensor_pm_ops,
 434         },
 435         .probe          = hid_incl_3d_probe,
 436         .remove         = hid_incl_3d_remove,
 437 };
 438 module_platform_driver(hid_incl_3d_platform_driver);
 439
 440 MODULE_DESCRIPTION("HID Sensor Inclinometer 3D");
 441 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 442 MODULE_LICENSE("GPL");