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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2013, Intel Corporation.
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/module.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/irq.h>
  12 #include <linux/slab.h>
  13 #include <linux/delay.h>
  14 #include <linux/hid-sensor-hub.h>
  15 #include <linux/iio/iio.h>
  16 #include <linux/iio/sysfs.h>
  17 #include <linux/iio/buffer.h>
  18 #include "../common/hid-sensors/hid-sensor-trigger.h"
  19
  20 enum incl_3d_channel {
  21         CHANNEL_SCAN_INDEX_X,
  22         CHANNEL_SCAN_INDEX_Y,
  23         CHANNEL_SCAN_INDEX_Z,
  24         INCLI_3D_CHANNEL_MAX,
  25 };
  26
  27 struct incl_3d_state {
  28         struct hid_sensor_hub_callbacks callbacks;
  29         struct hid_sensor_common common_attributes;
  30         struct hid_sensor_hub_attribute_info incl[INCLI_3D_CHANNEL_MAX];
  31         u32 incl_val[INCLI_3D_CHANNEL_MAX];
  32         int scale_pre_decml;
  33         int scale_post_decml;
  34         int scale_precision;
  35         int value_offset;
  36 };
  37
  38 static const u32 incl_3d_addresses[INCLI_3D_CHANNEL_MAX] = {
  39         HID_USAGE_SENSOR_ORIENT_TILT_X,
  40         HID_USAGE_SENSOR_ORIENT_TILT_Y,
  41         HID_USAGE_SENSOR_ORIENT_TILT_Z
  42 };
  43
  44 /* Channel definitions */
  45 static const struct iio_chan_spec incl_3d_channels[] = {
  46         {
  47                 .type = IIO_INCLI,
  48                 .modified = 1,
  49                 .channel2 = IIO_MOD_X,
  50                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  51                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  52                 BIT(IIO_CHAN_INFO_SCALE) |
  53                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  54                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  55                 .scan_index = CHANNEL_SCAN_INDEX_X,
  56         }, {
  57                 .type = IIO_INCLI,
  58                 .modified = 1,
  59                 .channel2 = IIO_MOD_Y,
  60                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  61                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  62                 BIT(IIO_CHAN_INFO_SCALE) |
  63                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  64                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  65                 .scan_index = CHANNEL_SCAN_INDEX_Y,
  66         }, {
  67                 .type = IIO_INCLI,
  68                 .modified = 1,
  69                 .channel2 = IIO_MOD_Z,
  70                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  71                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  72                 BIT(IIO_CHAN_INFO_SCALE) |
  73                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  74                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  75                 .scan_index = CHANNEL_SCAN_INDEX_Z,
  76         }
  77 };
  78
  79 /* Adjust channel real bits based on report descriptor */
  80 static void incl_3d_adjust_channel_bit_mask(struct iio_chan_spec *chan,
  81                                                 int size)
  82 {
  83         chan->scan_type.sign = 's';
  84         /* Real storage bits will change based on the report desc. */
  85         chan->scan_type.realbits = size * 8;
  86         /* Maximum size of a sample to capture is u32 */
  87         chan->scan_type.storagebits = sizeof(u32) * 8;
  88 }
  89
  90 /* Channel read_raw handler */
  91 static int incl_3d_read_raw(struct iio_dev *indio_dev,
  92                               struct iio_chan_spec const *chan,
  93                               int *val, int *val2,
  94                               long mask)
  95 {
  96         struct incl_3d_state *incl_state = iio_priv(indio_dev);
  97         int report_id = -1;
  98         u32 address;
  99         int ret_type;
 100         s32 min;
 101
 102         *val = 0;
 103         *val2 = 0;
 104         switch (mask) {
 105         case IIO_CHAN_INFO_RAW:
 106                 hid_sensor_power_state(&incl_state->common_attributes, true);
 107                 report_id = incl_state->incl[chan->scan_index].report_id;
 108                 min = incl_state->incl[chan->scan_index].logical_minimum;
 109                 address = incl_3d_addresses[chan->scan_index];
 110                 if (report_id >= 0)
 111                         *val = sensor_hub_input_attr_get_raw_value(
 112                                 incl_state->common_attributes.hsdev,
 113                                 HID_USAGE_SENSOR_INCLINOMETER_3D, address,
 114                                 report_id,
 115                                 SENSOR_HUB_SYNC,
 116                                 min < 0);
 117                 else {
 118                         hid_sensor_power_state(&incl_state->common_attributes,
 119                                                 false);
 120                         return -EINVAL;
 121                 }
 122                 hid_sensor_power_state(&incl_state->common_attributes, false);
 123                 ret_type = IIO_VAL_INT;
 124                 break;
 125         case IIO_CHAN_INFO_SCALE:
 126                 *val = incl_state->scale_pre_decml;
 127                 *val2 = incl_state->scale_post_decml;
 128                 ret_type = incl_state->scale_precision;
 129                 break;
 130         case IIO_CHAN_INFO_OFFSET:
 131                 *val = incl_state->value_offset;
 132                 ret_type = IIO_VAL_INT;
 133                 break;
 134         case IIO_CHAN_INFO_SAMP_FREQ:
 135                 ret_type = hid_sensor_read_samp_freq_value(
 136                         &incl_state->common_attributes, val, val2);
 137                 break;
 138         case IIO_CHAN_INFO_HYSTERESIS:
 139                 ret_type = hid_sensor_read_raw_hyst_value(
 140                         &incl_state->common_attributes, val, val2);
 141                 break;
 142         default:
 143                 ret_type = -EINVAL;
 144                 break;
 145         }
 146
 147         return ret_type;
 148 }
 149
 150 /* Channel write_raw handler */
 151 static int incl_3d_write_raw(struct iio_dev *indio_dev,
 152                                struct iio_chan_spec const *chan,
 153                                int val,
 154                                int val2,
 155                                long mask)
 156 {
 157         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 158         int ret;
 159
 160         switch (mask) {
 161         case IIO_CHAN_INFO_SAMP_FREQ:
 162                 ret = hid_sensor_write_samp_freq_value(
 163                                 &incl_state->common_attributes, val, val2);
 164                 break;
 165         case IIO_CHAN_INFO_HYSTERESIS:
 166                 ret = hid_sensor_write_raw_hyst_value(
 167                                 &incl_state->common_attributes, val, val2);
 168                 break;
 169         default:
 170                 ret = -EINVAL;
 171         }
 172
 173         return ret;
 174 }
 175
 176 static const struct iio_info incl_3d_info = {
 177         .read_raw = &incl_3d_read_raw,
 178         .write_raw = &incl_3d_write_raw,
 179 };
 180
 181 /* Function to push data to buffer */
 182 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
 183 {
 184         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 185         iio_push_to_buffers(indio_dev, (u8 *)data);
 186 }
 187
 188 /* Callback handler to send event after all samples are received and captured */
 189 static int incl_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 190                                 unsigned usage_id,
 191                                 void *priv)
 192 {
 193         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 194         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 195
 196         dev_dbg(&indio_dev->dev, "incl_3d_proc_event\n");
 197         if (atomic_read(&incl_state->common_attributes.data_ready))
 198                 hid_sensor_push_data(indio_dev,
 199                                 (u8 *)incl_state->incl_val,
 200                                 sizeof(incl_state->incl_val));
 201
 202         return 0;
 203 }
 204
 205 /* Capture samples in local storage */
 206 static int incl_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 207                                 unsigned usage_id,
 208                                 size_t raw_len, char *raw_data,
 209                                 void *priv)
 210 {
 211         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 212         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 213         int ret = 0;
 214
 215         switch (usage_id) {
 216         case HID_USAGE_SENSOR_ORIENT_TILT_X:
 217                 incl_state->incl_val[CHANNEL_SCAN_INDEX_X] = *(u32 *)raw_data;
 218         break;
 219         case HID_USAGE_SENSOR_ORIENT_TILT_Y:
 220                 incl_state->incl_val[CHANNEL_SCAN_INDEX_Y] = *(u32 *)raw_data;
 221         break;
 222         case HID_USAGE_SENSOR_ORIENT_TILT_Z:
 223                 incl_state->incl_val[CHANNEL_SCAN_INDEX_Z] = *(u32 *)raw_data;
 224         break;
 225         default:
 226                 ret = -EINVAL;
 227                 break;
 228         }
 229
 230         return ret;
 231 }
 232
 233 /* Parse report which is specific to an usage id*/
 234 static int incl_3d_parse_report(struct platform_device *pdev,
 235                                 struct hid_sensor_hub_device *hsdev,
 236                                 struct iio_chan_spec *channels,
 237                                 unsigned usage_id,
 238                                 struct incl_3d_state *st)
 239 {
 240         int ret;
 241
 242         ret = sensor_hub_input_get_attribute_info(hsdev,
 243                                 HID_INPUT_REPORT,
 244                                 usage_id,
 245                                 HID_USAGE_SENSOR_ORIENT_TILT_X,
 246                                 &st->incl[CHANNEL_SCAN_INDEX_X]);
 247         if (ret)
 248                 return ret;
 249         incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_X],
 250                                 st->incl[CHANNEL_SCAN_INDEX_X].size);
 251
 252         ret = sensor_hub_input_get_attribute_info(hsdev,
 253                                 HID_INPUT_REPORT,
 254                                 usage_id,
 255                                 HID_USAGE_SENSOR_ORIENT_TILT_Y,
 256                                 &st->incl[CHANNEL_SCAN_INDEX_Y]);
 257         if (ret)
 258                 return ret;
 259         incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Y],
 260                                 st->incl[CHANNEL_SCAN_INDEX_Y].size);
 261
 262         ret = sensor_hub_input_get_attribute_info(hsdev,
 263                                 HID_INPUT_REPORT,
 264                                 usage_id,
 265                                 HID_USAGE_SENSOR_ORIENT_TILT_Z,
 266                                 &st->incl[CHANNEL_SCAN_INDEX_Z]);
 267         if (ret)
 268                 return ret;
 269         incl_3d_adjust_channel_bit_mask(&channels[CHANNEL_SCAN_INDEX_Z],
 270                                 st->incl[CHANNEL_SCAN_INDEX_Z].size);
 271
 272         dev_dbg(&pdev->dev, "incl_3d %x:%x, %x:%x, %x:%x\n",
 273                         st->incl[0].index,
 274                         st->incl[0].report_id,
 275                         st->incl[1].index, st->incl[1].report_id,
 276                         st->incl[2].index, st->incl[2].report_id);
 277
 278         st->scale_precision = hid_sensor_format_scale(
 279                                 HID_USAGE_SENSOR_INCLINOMETER_3D,
 280                                 &st->incl[CHANNEL_SCAN_INDEX_X],
 281                                 &st->scale_pre_decml, &st->scale_post_decml);
 282
 283         /* Set Sensitivity field ids, when there is no individual modifier */
 284         if (st->common_attributes.sensitivity.index < 0) {
 285                 sensor_hub_input_get_attribute_info(hsdev,
 286                         HID_FEATURE_REPORT, usage_id,
 287                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 288                         HID_USAGE_SENSOR_DATA_ORIENTATION,
 289                         &st->common_attributes.sensitivity);
 290                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 291                         st->common_attributes.sensitivity.index,
 292                         st->common_attributes.sensitivity.report_id);
 293         }
 294         return ret;
 295 }
 296
 297 /* Function to initialize the processing for usage id */
 298 static int hid_incl_3d_probe(struct platform_device *pdev)
 299 {
 300         int ret;
 301         static char *name = "incli_3d";
 302         struct iio_dev *indio_dev;
 303         struct incl_3d_state *incl_state;
 304         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 305
 306         indio_dev = devm_iio_device_alloc(&pdev->dev,
 307                                           sizeof(struct incl_3d_state));
 308         if (indio_dev == NULL)
 309                 return -ENOMEM;
 310
 311         platform_set_drvdata(pdev, indio_dev);
 312
 313         incl_state = iio_priv(indio_dev);
 314         incl_state->common_attributes.hsdev = hsdev;
 315         incl_state->common_attributes.pdev = pdev;
 316
 317         ret = hid_sensor_parse_common_attributes(hsdev,
 318                                 HID_USAGE_SENSOR_INCLINOMETER_3D,
 319                                 &incl_state->common_attributes);
 320         if (ret) {
 321                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 322                 return ret;
 323         }
 324
 325         indio_dev->channels = kmemdup(incl_3d_channels,
 326                                       sizeof(incl_3d_channels), GFP_KERNEL);
 327         if (!indio_dev->channels) {
 328                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 329                 return -ENOMEM;
 330         }
 331
 332         ret = incl_3d_parse_report(pdev, hsdev,
 333                                    (struct iio_chan_spec *)indio_dev->channels,
 334                                    HID_USAGE_SENSOR_INCLINOMETER_3D,
 335                                    incl_state);
 336         if (ret) {
 337                 dev_err(&pdev->dev, "failed to setup attributes\n");
 338                 goto error_free_dev_mem;
 339         }
 340
 341         indio_dev->num_channels = ARRAY_SIZE(incl_3d_channels);
 342         indio_dev->info = &incl_3d_info;
 343         indio_dev->name = name;
 344         indio_dev->modes = INDIO_DIRECT_MODE;
 345
 346         atomic_set(&incl_state->common_attributes.data_ready, 0);
 347
 348         ret = hid_sensor_setup_trigger(indio_dev, name,
 349                                         &incl_state->common_attributes);
 350         if (ret) {
 351                 dev_err(&pdev->dev, "trigger setup failed\n");
 352                 goto error_free_dev_mem;
 353         }
 354
 355         ret = iio_device_register(indio_dev);
 356         if (ret) {
 357                 dev_err(&pdev->dev, "device register failed\n");
 358                 goto error_remove_trigger;
 359         }
 360
 361         incl_state->callbacks.send_event = incl_3d_proc_event;
 362         incl_state->callbacks.capture_sample = incl_3d_capture_sample;
 363         incl_state->callbacks.pdev = pdev;
 364         ret = sensor_hub_register_callback(hsdev,
 365                                         HID_USAGE_SENSOR_INCLINOMETER_3D,
 366                                         &incl_state->callbacks);
 367         if (ret) {
 368                 dev_err(&pdev->dev, "callback reg failed\n");
 369                 goto error_iio_unreg;
 370         }
 371
 372         return 0;
 373
 374 error_iio_unreg:
 375         iio_device_unregister(indio_dev);
 376 error_remove_trigger:
 377         hid_sensor_remove_trigger(indio_dev, &incl_state->common_attributes);
 378 error_free_dev_mem:
 379         kfree(indio_dev->channels);
 380         return ret;
 381 }
 382
 383 /* Function to deinitialize the processing for usage id */
 384 static int hid_incl_3d_remove(struct platform_device *pdev)
 385 {
 386         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 387         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 388         struct incl_3d_state *incl_state = iio_priv(indio_dev);
 389
 390         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_INCLINOMETER_3D);
 391         iio_device_unregister(indio_dev);
 392         hid_sensor_remove_trigger(indio_dev, &incl_state->common_attributes);
 393         kfree(indio_dev->channels);
 394
 395         return 0;
 396 }
 397
 398 static const struct platform_device_id hid_incl_3d_ids[] = {
 399         {
 400                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 401                 .name = "HID-SENSOR-200086",
 402         },
 403         { /* sentinel */ }
 404 };
 405 MODULE_DEVICE_TABLE(platform, hid_incl_3d_ids);
 406
 407 static struct platform_driver hid_incl_3d_platform_driver = {
 408         .id_table = hid_incl_3d_ids,
 409         .driver = {
 410                 .name   = KBUILD_MODNAME,
 411                 .pm     = &hid_sensor_pm_ops,
 412         },
 413         .probe          = hid_incl_3d_probe,
 414         .remove         = hid_incl_3d_remove,
 415 };
 416 module_platform_driver(hid_incl_3d_platform_driver);
 417
 418 MODULE_DESCRIPTION("HID Sensor Inclinometer 3D");
 419 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
 420 MODULE_LICENSE("GPL");