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         u32 accel_val[ACCEL_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 accel_3d_addresses[ACCEL_3D_CHANNEL_MAX] = {
  53         HID_USAGE_SENSOR_ACCEL_X_AXIS,
  54         HID_USAGE_SENSOR_ACCEL_Y_AXIS,
  55         HID_USAGE_SENSOR_ACCEL_Z_AXIS
  56 };
  57
  58 /* Channel definitions */
  59 static const struct iio_chan_spec accel_3d_channels[] = {
  60         {
  61                 .type = IIO_ACCEL,
  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_ACCEL,
  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_ACCEL,
  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 accel_3d_adjust_channel_bit_mask(struct iio_chan_spec *channels,
  95                                                 int channel, int size)
  96 {
  97         channels[channel].scan_type.sign = 's';
  98         /* Real storage bits will change based on the report desc. */
  99         channels[channel].scan_type.realbits = size * 8;
 100         /* Maximum size of a sample to capture is u32 */
 101         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
 102 }
 103
 104 /* Channel read_raw handler */
 105 static int accel_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 accel_3d_state *accel_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 0:
 119                 hid_sensor_power_state(&accel_state->common_attributes, true);
 120                 report_id = accel_state->accel[chan->scan_index].report_id;
 121                 address = accel_3d_addresses[chan->scan_index];
 122                 if (report_id >= 0)
 123                         *val = sensor_hub_input_attr_get_raw_value(
 124                                         accel_state->common_attributes.hsdev,
 125                                         HID_USAGE_SENSOR_ACCEL_3D, address,
 126                                         report_id);
 127                 else {
 128                         *val = 0;
 129                         hid_sensor_power_state(&accel_state->common_attributes,
 130                                                  false);
 131                         return -EINVAL;
 132                 }
 133                 hid_sensor_power_state(&accel_state->common_attributes, false);
 134                 ret_type = IIO_VAL_INT;
 135                 break;
 136         case IIO_CHAN_INFO_SCALE:
 137                 *val = accel_state->scale_pre_decml;
 138                 *val2 = accel_state->scale_post_decml;
 139                 ret_type = accel_state->scale_precision;
 140                 break;
 141         case IIO_CHAN_INFO_OFFSET:
 142                 *val = accel_state->value_offset;
 143                 ret_type = IIO_VAL_INT;
 144                 break;
 145         case IIO_CHAN_INFO_SAMP_FREQ:
 146                 ret_type = hid_sensor_read_samp_freq_value(
 147                         &accel_state->common_attributes, val, val2);
 148                 break;
 149         case IIO_CHAN_INFO_HYSTERESIS:
 150                 ret_type = hid_sensor_read_raw_hyst_value(
 151                         &accel_state->common_attributes, val, val2);
 152                 break;
 153         default:
 154                 ret_type = -EINVAL;
 155                 break;
 156         }
 157
 158         return ret_type;
 159 }
 160
 161 /* Channel write_raw handler */
 162 static int accel_3d_write_raw(struct iio_dev *indio_dev,
 163                                struct iio_chan_spec const *chan,
 164                                int val,
 165                                int val2,
 166                                long mask)
 167 {
 168         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 169         int ret = 0;
 170
 171         switch (mask) {
 172         case IIO_CHAN_INFO_SAMP_FREQ:
 173                 ret = hid_sensor_write_samp_freq_value(
 174                                 &accel_state->common_attributes, val, val2);
 175                 break;
 176         case IIO_CHAN_INFO_HYSTERESIS:
 177                 ret = hid_sensor_write_raw_hyst_value(
 178                                 &accel_state->common_attributes, val, val2);
 179                 break;
 180         default:
 181                 ret = -EINVAL;
 182         }
 183
 184         return ret;
 185 }
 186
 187 static const struct iio_info accel_3d_info = {
 188         .driver_module = THIS_MODULE,
 189         .read_raw = &accel_3d_read_raw,
 190         .write_raw = &accel_3d_write_raw,
 191 };
 192
 193 /* Function to push data to buffer */
 194 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
 195         int len)
 196 {
 197         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 198         iio_push_to_buffers(indio_dev, data);
 199 }
 200
 201 /* Callback handler to send event after all samples are received and captured */
 202 static int accel_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 accel_3d_state *accel_state = iio_priv(indio_dev);
 208
 209         dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
 210         if (atomic_read(&accel_state->common_attributes.data_ready))
 211                 hid_sensor_push_data(indio_dev,
 212                                 accel_state->accel_val,
 213                                 sizeof(accel_state->accel_val));
 214
 215         return 0;
 216 }
 217
 218 /* Capture samples in local storage */
 219 static int accel_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 accel_3d_state *accel_state = iio_priv(indio_dev);
 226         int offset;
 227         int ret = -EINVAL;
 228
 229         switch (usage_id) {
 230         case HID_USAGE_SENSOR_ACCEL_X_AXIS:
 231         case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
 232         case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
 233                 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
 234                 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
 235                                                 *(u32 *)raw_data;
 236                 ret = 0;
 237         break;
 238         default:
 239                 break;
 240         }
 241
 242         return ret;
 243 }
 244
 245 /* Parse report which is specific to an usage id*/
 246 static int accel_3d_parse_report(struct platform_device *pdev,
 247                                 struct hid_sensor_hub_device *hsdev,
 248                                 struct iio_chan_spec *channels,
 249                                 unsigned usage_id,
 250                                 struct accel_3d_state *st)
 251 {
 252         int ret;
 253         int i;
 254
 255         for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
 256                 ret = sensor_hub_input_get_attribute_info(hsdev,
 257                                 HID_INPUT_REPORT,
 258                                 usage_id,
 259                                 HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
 260                                 &st->accel[CHANNEL_SCAN_INDEX_X + i]);
 261                 if (ret < 0)
 262                         break;
 263                 accel_3d_adjust_channel_bit_mask(channels,
 264                                 CHANNEL_SCAN_INDEX_X + i,
 265                                 st->accel[CHANNEL_SCAN_INDEX_X + i].size);
 266         }
 267         dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
 268                         st->accel[0].index,
 269                         st->accel[0].report_id,
 270                         st->accel[1].index, st->accel[1].report_id,
 271                         st->accel[2].index, st->accel[2].report_id);
 272
 273         st->scale_precision = hid_sensor_format_scale(
 274                                 HID_USAGE_SENSOR_ACCEL_3D,
 275                                 &st->accel[CHANNEL_SCAN_INDEX_X],
 276                                 &st->scale_pre_decml, &st->scale_post_decml);
 277
 278         /* Set Sensitivity field ids, when there is no individual modifier */
 279         if (st->common_attributes.sensitivity.index < 0) {
 280                 sensor_hub_input_get_attribute_info(hsdev,
 281                         HID_FEATURE_REPORT, usage_id,
 282                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 283                         HID_USAGE_SENSOR_DATA_ACCELERATION,
 284                         &st->common_attributes.sensitivity);
 285                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 286                         st->common_attributes.sensitivity.index,
 287                         st->common_attributes.sensitivity.report_id);
 288         }
 289
 290         return ret;
 291 }
 292
 293 /* Function to initialize the processing for usage id */
 294 static int hid_accel_3d_probe(struct platform_device *pdev)
 295 {
 296         int ret = 0;
 297         static const char *name = "accel_3d";
 298         struct iio_dev *indio_dev;
 299         struct accel_3d_state *accel_state;
 300         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 301         struct iio_chan_spec *channels;
 302
 303         indio_dev = devm_iio_device_alloc(&pdev->dev,
 304                                           sizeof(struct accel_3d_state));
 305         if (indio_dev == NULL)
 306                 return -ENOMEM;
 307
 308         platform_set_drvdata(pdev, indio_dev);
 309
 310         accel_state = iio_priv(indio_dev);
 311         accel_state->common_attributes.hsdev = hsdev;
 312         accel_state->common_attributes.pdev = pdev;
 313
 314         ret = hid_sensor_parse_common_attributes(hsdev,
 315                                         HID_USAGE_SENSOR_ACCEL_3D,
 316                                         &accel_state->common_attributes);
 317         if (ret) {
 318                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 319                 return ret;
 320         }
 321
 322         channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels),
 323                            GFP_KERNEL);
 324         if (!channels) {
 325                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 326                 return -ENOMEM;
 327         }
 328
 329         ret = accel_3d_parse_report(pdev, hsdev, channels,
 330                                         HID_USAGE_SENSOR_ACCEL_3D, accel_state);
 331         if (ret) {
 332                 dev_err(&pdev->dev, "failed to setup attributes\n");
 333                 goto error_free_dev_mem;
 334         }
 335
 336         indio_dev->channels = channels;
 337         indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
 338         indio_dev->dev.parent = &pdev->dev;
 339         indio_dev->info = &accel_3d_info;
 340         indio_dev->name = name;
 341         indio_dev->modes = INDIO_DIRECT_MODE;
 342
 343         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 344                 NULL, NULL);
 345         if (ret) {
 346                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 347                 goto error_free_dev_mem;
 348         }
 349         atomic_set(&accel_state->common_attributes.data_ready, 0);
 350         ret = hid_sensor_setup_trigger(indio_dev, name,
 351                                         &accel_state->common_attributes);
 352         if (ret < 0) {
 353                 dev_err(&pdev->dev, "trigger setup failed\n");
 354                 goto error_unreg_buffer_funcs;
 355         }
 356
 357         ret = iio_device_register(indio_dev);
 358         if (ret) {
 359                 dev_err(&pdev->dev, "device register failed\n");
 360                 goto error_remove_trigger;
 361         }
 362
 363         accel_state->callbacks.send_event = accel_3d_proc_event;
 364         accel_state->callbacks.capture_sample = accel_3d_capture_sample;
 365         accel_state->callbacks.pdev = pdev;
 366         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D,
 367                                         &accel_state->callbacks);
 368         if (ret < 0) {
 369                 dev_err(&pdev->dev, "callback reg failed\n");
 370                 goto error_iio_unreg;
 371         }
 372
 373         return ret;
 374
 375 error_iio_unreg:
 376         iio_device_unregister(indio_dev);
 377 error_remove_trigger:
 378         hid_sensor_remove_trigger(&accel_state->common_attributes);
 379 error_unreg_buffer_funcs:
 380         iio_triggered_buffer_cleanup(indio_dev);
 381 error_free_dev_mem:
 382         kfree(indio_dev->channels);
 383         return ret;
 384 }
 385
 386 /* Function to deinitialize the processing for usage id */
 387 static int hid_accel_3d_remove(struct platform_device *pdev)
 388 {
 389         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 390         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 391         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 392
 393         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D);
 394         iio_device_unregister(indio_dev);
 395         hid_sensor_remove_trigger(&accel_state->common_attributes);
 396         iio_triggered_buffer_cleanup(indio_dev);
 397         kfree(indio_dev->channels);
 398
 399         return 0;
 400 }
 401
 402 static struct platform_device_id hid_accel_3d_ids[] = {
 403         {
 404                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 405                 .name = "HID-SENSOR-200073",
 406         },
 407         { /* sentinel */ }
 408 };
 409 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
 410
 411 static struct platform_driver hid_accel_3d_platform_driver = {
 412         .id_table = hid_accel_3d_ids,
 413         .driver = {
 414                 .name   = KBUILD_MODNAME,
 415                 .pm     = &hid_sensor_pm_ops,
 416         },
 417         .probe          = hid_accel_3d_probe,
 418         .remove         = hid_accel_3d_remove,
 419 };
 420 module_platform_driver(hid_accel_3d_platform_driver);
 421
 422 MODULE_DESCRIPTION("HID Sensor Accel 3D");
 423 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 424 MODULE_LICENSE("GPL");