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         s32 poll_value;
 115
 116         *val = 0;
 117         *val2 = 0;
 118         switch (mask) {
 119         case 0:
 120                 poll_value = hid_sensor_read_poll_value(
 121                                         &accel_state->common_attributes);
 122                 if (poll_value < 0)
 123                         return -EINVAL;
 124
 125                 hid_sensor_power_state(&accel_state->common_attributes, true);
 126                 msleep_interruptible(poll_value * 2);
 127                 report_id = accel_state->accel[chan->scan_index].report_id;
 128                 address = accel_3d_addresses[chan->scan_index];
 129                 if (report_id >= 0)
 130                         *val = sensor_hub_input_attr_get_raw_value(
 131                                         accel_state->common_attributes.hsdev,
 132                                         HID_USAGE_SENSOR_ACCEL_3D, address,
 133                                         report_id);
 134                 else {
 135                         *val = 0;
 136                         hid_sensor_power_state(&accel_state->common_attributes,
 137                                                  false);
 138                         return -EINVAL;
 139                 }
 140                 hid_sensor_power_state(&accel_state->common_attributes, false);
 141                 ret_type = IIO_VAL_INT;
 142                 break;
 143         case IIO_CHAN_INFO_SCALE:
 144                 *val = accel_state->scale_pre_decml;
 145                 *val2 = accel_state->scale_post_decml;
 146                 ret_type = accel_state->scale_precision;
 147                 break;
 148         case IIO_CHAN_INFO_OFFSET:
 149                 *val = accel_state->value_offset;
 150                 ret_type = IIO_VAL_INT;
 151                 break;
 152         case IIO_CHAN_INFO_SAMP_FREQ:
 153                 ret_type = hid_sensor_read_samp_freq_value(
 154                         &accel_state->common_attributes, val, val2);
 155                 break;
 156         case IIO_CHAN_INFO_HYSTERESIS:
 157                 ret_type = hid_sensor_read_raw_hyst_value(
 158                         &accel_state->common_attributes, val, val2);
 159                 break;
 160         default:
 161                 ret_type = -EINVAL;
 162                 break;
 163         }
 164
 165         return ret_type;
 166 }
 167
 168 /* Channel write_raw handler */
 169 static int accel_3d_write_raw(struct iio_dev *indio_dev,
 170                                struct iio_chan_spec const *chan,
 171                                int val,
 172                                int val2,
 173                                long mask)
 174 {
 175         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 176         int ret = 0;
 177
 178         switch (mask) {
 179         case IIO_CHAN_INFO_SAMP_FREQ:
 180                 ret = hid_sensor_write_samp_freq_value(
 181                                 &accel_state->common_attributes, val, val2);
 182                 break;
 183         case IIO_CHAN_INFO_HYSTERESIS:
 184                 ret = hid_sensor_write_raw_hyst_value(
 185                                 &accel_state->common_attributes, val, val2);
 186                 break;
 187         default:
 188                 ret = -EINVAL;
 189         }
 190
 191         return ret;
 192 }
 193
 194 static const struct iio_info accel_3d_info = {
 195         .driver_module = THIS_MODULE,
 196         .read_raw = &accel_3d_read_raw,
 197         .write_raw = &accel_3d_write_raw,
 198 };
 199
 200 /* Function to push data to buffer */
 201 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
 202         int len)
 203 {
 204         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 205         iio_push_to_buffers(indio_dev, data);
 206 }
 207
 208 /* Callback handler to send event after all samples are received and captured */
 209 static int accel_3d_proc_event(struct hid_sensor_hub_device *hsdev,
 210                                 unsigned usage_id,
 211                                 void *priv)
 212 {
 213         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 214         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 215
 216         dev_dbg(&indio_dev->dev, "accel_3d_proc_event\n");
 217         if (atomic_read(&accel_state->common_attributes.data_ready))
 218                 hid_sensor_push_data(indio_dev,
 219                                 accel_state->accel_val,
 220                                 sizeof(accel_state->accel_val));
 221
 222         return 0;
 223 }
 224
 225 /* Capture samples in local storage */
 226 static int accel_3d_capture_sample(struct hid_sensor_hub_device *hsdev,
 227                                 unsigned usage_id,
 228                                 size_t raw_len, char *raw_data,
 229                                 void *priv)
 230 {
 231         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 232         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 233         int offset;
 234         int ret = -EINVAL;
 235
 236         switch (usage_id) {
 237         case HID_USAGE_SENSOR_ACCEL_X_AXIS:
 238         case HID_USAGE_SENSOR_ACCEL_Y_AXIS:
 239         case HID_USAGE_SENSOR_ACCEL_Z_AXIS:
 240                 offset = usage_id - HID_USAGE_SENSOR_ACCEL_X_AXIS;
 241                 accel_state->accel_val[CHANNEL_SCAN_INDEX_X + offset] =
 242                                                 *(u32 *)raw_data;
 243                 ret = 0;
 244         break;
 245         default:
 246                 break;
 247         }
 248
 249         return ret;
 250 }
 251
 252 /* Parse report which is specific to an usage id*/
 253 static int accel_3d_parse_report(struct platform_device *pdev,
 254                                 struct hid_sensor_hub_device *hsdev,
 255                                 struct iio_chan_spec *channels,
 256                                 unsigned usage_id,
 257                                 struct accel_3d_state *st)
 258 {
 259         int ret;
 260         int i;
 261
 262         for (i = 0; i <= CHANNEL_SCAN_INDEX_Z; ++i) {
 263                 ret = sensor_hub_input_get_attribute_info(hsdev,
 264                                 HID_INPUT_REPORT,
 265                                 usage_id,
 266                                 HID_USAGE_SENSOR_ACCEL_X_AXIS + i,
 267                                 &st->accel[CHANNEL_SCAN_INDEX_X + i]);
 268                 if (ret < 0)
 269                         break;
 270                 accel_3d_adjust_channel_bit_mask(channels,
 271                                 CHANNEL_SCAN_INDEX_X + i,
 272                                 st->accel[CHANNEL_SCAN_INDEX_X + i].size);
 273         }
 274         dev_dbg(&pdev->dev, "accel_3d %x:%x, %x:%x, %x:%x\n",
 275                         st->accel[0].index,
 276                         st->accel[0].report_id,
 277                         st->accel[1].index, st->accel[1].report_id,
 278                         st->accel[2].index, st->accel[2].report_id);
 279
 280         st->scale_precision = hid_sensor_format_scale(
 281                                 HID_USAGE_SENSOR_ACCEL_3D,
 282                                 &st->accel[CHANNEL_SCAN_INDEX_X],
 283                                 &st->scale_pre_decml, &st->scale_post_decml);
 284
 285         /* Set Sensitivity field ids, when there is no individual modifier */
 286         if (st->common_attributes.sensitivity.index < 0) {
 287                 sensor_hub_input_get_attribute_info(hsdev,
 288                         HID_FEATURE_REPORT, usage_id,
 289                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 290                         HID_USAGE_SENSOR_DATA_ACCELERATION,
 291                         &st->common_attributes.sensitivity);
 292                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 293                         st->common_attributes.sensitivity.index,
 294                         st->common_attributes.sensitivity.report_id);
 295         }
 296
 297         return ret;
 298 }
 299
 300 /* Function to initialize the processing for usage id */
 301 static int hid_accel_3d_probe(struct platform_device *pdev)
 302 {
 303         int ret = 0;
 304         static const char *name = "accel_3d";
 305         struct iio_dev *indio_dev;
 306         struct accel_3d_state *accel_state;
 307         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 308         struct iio_chan_spec *channels;
 309
 310         indio_dev = devm_iio_device_alloc(&pdev->dev,
 311                                           sizeof(struct accel_3d_state));
 312         if (indio_dev == NULL)
 313                 return -ENOMEM;
 314
 315         platform_set_drvdata(pdev, indio_dev);
 316
 317         accel_state = iio_priv(indio_dev);
 318         accel_state->common_attributes.hsdev = hsdev;
 319         accel_state->common_attributes.pdev = pdev;
 320
 321         ret = hid_sensor_parse_common_attributes(hsdev,
 322                                         HID_USAGE_SENSOR_ACCEL_3D,
 323                                         &accel_state->common_attributes);
 324         if (ret) {
 325                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 326                 return ret;
 327         }
 328
 329         channels = kmemdup(accel_3d_channels, sizeof(accel_3d_channels),
 330                            GFP_KERNEL);
 331         if (!channels) {
 332                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 333                 return -ENOMEM;
 334         }
 335
 336         ret = accel_3d_parse_report(pdev, hsdev, channels,
 337                                         HID_USAGE_SENSOR_ACCEL_3D, accel_state);
 338         if (ret) {
 339                 dev_err(&pdev->dev, "failed to setup attributes\n");
 340                 goto error_free_dev_mem;
 341         }
 342
 343         indio_dev->channels = channels;
 344         indio_dev->num_channels = ARRAY_SIZE(accel_3d_channels);
 345         indio_dev->dev.parent = &pdev->dev;
 346         indio_dev->info = &accel_3d_info;
 347         indio_dev->name = name;
 348         indio_dev->modes = INDIO_DIRECT_MODE;
 349
 350         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 351                 NULL, NULL);
 352         if (ret) {
 353                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 354                 goto error_free_dev_mem;
 355         }
 356         atomic_set(&accel_state->common_attributes.data_ready, 0);
 357         ret = hid_sensor_setup_trigger(indio_dev, name,
 358                                         &accel_state->common_attributes);
 359         if (ret < 0) {
 360                 dev_err(&pdev->dev, "trigger setup failed\n");
 361                 goto error_unreg_buffer_funcs;
 362         }
 363
 364         ret = iio_device_register(indio_dev);
 365         if (ret) {
 366                 dev_err(&pdev->dev, "device register failed\n");
 367                 goto error_remove_trigger;
 368         }
 369
 370         accel_state->callbacks.send_event = accel_3d_proc_event;
 371         accel_state->callbacks.capture_sample = accel_3d_capture_sample;
 372         accel_state->callbacks.pdev = pdev;
 373         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D,
 374                                         &accel_state->callbacks);
 375         if (ret < 0) {
 376                 dev_err(&pdev->dev, "callback reg failed\n");
 377                 goto error_iio_unreg;
 378         }
 379
 380         return ret;
 381
 382 error_iio_unreg:
 383         iio_device_unregister(indio_dev);
 384 error_remove_trigger:
 385         hid_sensor_remove_trigger(&accel_state->common_attributes);
 386 error_unreg_buffer_funcs:
 387         iio_triggered_buffer_cleanup(indio_dev);
 388 error_free_dev_mem:
 389         kfree(indio_dev->channels);
 390         return ret;
 391 }
 392
 393 /* Function to deinitialize the processing for usage id */
 394 static int hid_accel_3d_remove(struct platform_device *pdev)
 395 {
 396         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 397         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 398         struct accel_3d_state *accel_state = iio_priv(indio_dev);
 399
 400         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ACCEL_3D);
 401         iio_device_unregister(indio_dev);
 402         hid_sensor_remove_trigger(&accel_state->common_attributes);
 403         iio_triggered_buffer_cleanup(indio_dev);
 404         kfree(indio_dev->channels);
 405
 406         return 0;
 407 }
 408
 409 static struct platform_device_id hid_accel_3d_ids[] = {
 410         {
 411                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 412                 .name = "HID-SENSOR-200073",
 413         },
 414         { /* sentinel */ }
 415 };
 416 MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids);
 417
 418 static struct platform_driver hid_accel_3d_platform_driver = {
 419         .id_table = hid_accel_3d_ids,
 420         .driver = {
 421                 .name   = KBUILD_MODNAME,
 422                 .owner  = THIS_MODULE,
 423         },
 424         .probe          = hid_accel_3d_probe,
 425         .remove         = hid_accel_3d_remove,
 426 };
 427 module_platform_driver(hid_accel_3d_platform_driver);
 428
 429 MODULE_DESCRIPTION("HID Sensor Accel 3D");
 430 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 431 MODULE_LICENSE("GPL");