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