kernel/drivers/iio/gyro/hid-sensor-gyro-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 gyro_3d_channel {
  35         CHANNEL_SCAN_INDEX_X,
  36         CHANNEL_SCAN_INDEX_Y,
  37         CHANNEL_SCAN_INDEX_Z,
  38         GYRO_3D_CHANNEL_MAX,
  39 };
  40
  41 struct gyro_3d_state {
  42         struct hid_sensor_hub_callbacks callbacks;
  43         struct hid_sensor_common common_attributes;
  44         struct hid_sensor_hub_attribute_info gyro[GYRO_3D_CHANNEL_MAX];
  45         u32 gyro_val[GYRO_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 gyro_3d_addresses[GYRO_3D_CHANNEL_MAX] = {
  53         HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS,
  54         HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS,
  55         HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS
  56 };
  57
  58 /* Channel definitions */
  59 static const struct iio_chan_spec gyro_3d_channels[] = {
  60         {
  61                 .type = IIO_ANGL_VEL,
  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_ANGL_VEL,
  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_ANGL_VEL,
  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 gyro_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 gyro_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 gyro_3d_state *gyro_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(&gyro_state->common_attributes, true);
 120                 report_id = gyro_state->gyro[chan->scan_index].report_id;
 121                 address = gyro_3d_addresses[chan->scan_index];
 122                 if (report_id >= 0)
 123                         *val = sensor_hub_input_attr_get_raw_value(
 124                                         gyro_state->common_attributes.hsdev,
 125                                         HID_USAGE_SENSOR_GYRO_3D, address,
 126                                         report_id,
 127                                         SENSOR_HUB_SYNC);
 128                 else {
 129                         *val = 0;
 130                         hid_sensor_power_state(&gyro_state->common_attributes,
 131                                                 false);
 132                         return -EINVAL;
 133                 }
 134                 hid_sensor_power_state(&gyro_state->common_attributes, false);
 135                 ret_type = IIO_VAL_INT;
 136                 break;
 137         case IIO_CHAN_INFO_SCALE:
 138                 *val = gyro_state->scale_pre_decml;
 139                 *val2 = gyro_state->scale_post_decml;
 140                 ret_type = gyro_state->scale_precision;
 141                 break;
 142         case IIO_CHAN_INFO_OFFSET:
 143                 *val = gyro_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                         &gyro_state->common_attributes, val, val2);
 149                 break;
 150         case IIO_CHAN_INFO_HYSTERESIS:
 151                 ret_type = hid_sensor_read_raw_hyst_value(
 152                         &gyro_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 gyro_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 gyro_3d_state *gyro_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                                 &gyro_state->common_attributes, val, val2);
 176                 break;
 177         case IIO_CHAN_INFO_HYSTERESIS:
 178                 ret = hid_sensor_write_raw_hyst_value(
 179                                 &gyro_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 gyro_3d_info = {
 189         .driver_module = THIS_MODULE,
 190         .read_raw = &gyro_3d_read_raw,
 191         .write_raw = &gyro_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 gyro_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 gyro_3d_state *gyro_state = iio_priv(indio_dev);
 209
 210         dev_dbg(&indio_dev->dev, "gyro_3d_proc_event\n");
 211         if (atomic_read(&gyro_state->common_attributes.data_ready))
 212                 hid_sensor_push_data(indio_dev,
 213                                 gyro_state->gyro_val,
 214                                 sizeof(gyro_state->gyro_val));
 215
 216         return 0;
 217 }
 218
 219 /* Capture samples in local storage */
 220 static int gyro_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 gyro_3d_state *gyro_state = iio_priv(indio_dev);
 227         int offset;
 228         int ret = -EINVAL;
 229
 230         switch (usage_id) {
 231         case HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS:
 232         case HID_USAGE_SENSOR_ANGL_VELOCITY_Y_AXIS:
 233         case HID_USAGE_SENSOR_ANGL_VELOCITY_Z_AXIS:
 234                 offset = usage_id - HID_USAGE_SENSOR_ANGL_VELOCITY_X_AXIS;
 235                 gyro_state->gyro_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 gyro_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 gyro_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_ANGL_VELOCITY_X_AXIS + i,
 261                                 &st->gyro[CHANNEL_SCAN_INDEX_X + i]);
 262                 if (ret < 0)
 263                         break;
 264                 gyro_3d_adjust_channel_bit_mask(channels,
 265                                 CHANNEL_SCAN_INDEX_X + i,
 266                                 st->gyro[CHANNEL_SCAN_INDEX_X + i].size);
 267         }
 268         dev_dbg(&pdev->dev, "gyro_3d %x:%x, %x:%x, %x:%x\n",
 269                         st->gyro[0].index,
 270                         st->gyro[0].report_id,
 271                         st->gyro[1].index, st->gyro[1].report_id,
 272                         st->gyro[2].index, st->gyro[2].report_id);
 273
 274         st->scale_precision = hid_sensor_format_scale(
 275                                 HID_USAGE_SENSOR_GYRO_3D,
 276                                 &st->gyro[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_ANGL_VELOCITY,
 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         return ret;
 291 }
 292
 293 /* Function to initialize the processing for usage id */
 294 static int hid_gyro_3d_probe(struct platform_device *pdev)
 295 {
 296         int ret = 0;
 297         static const char *name = "gyro_3d";
 298         struct iio_dev *indio_dev;
 299         struct gyro_3d_state *gyro_state;
 300         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 301
 302         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*gyro_state));
 303         if (!indio_dev)
 304                 return -ENOMEM;
 305         platform_set_drvdata(pdev, indio_dev);
 306
 307         gyro_state = iio_priv(indio_dev);
 308         gyro_state->common_attributes.hsdev = hsdev;
 309         gyro_state->common_attributes.pdev = pdev;
 310
 311         ret = hid_sensor_parse_common_attributes(hsdev,
 312                                                 HID_USAGE_SENSOR_GYRO_3D,
 313                                                 &gyro_state->common_attributes);
 314         if (ret) {
 315                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 316                 return ret;
 317         }
 318
 319         indio_dev->channels = kmemdup(gyro_3d_channels,
 320                                       sizeof(gyro_3d_channels), GFP_KERNEL);
 321         if (!indio_dev->channels) {
 322                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 323                 return -ENOMEM;
 324         }
 325
 326         ret = gyro_3d_parse_report(pdev, hsdev,
 327                                    (struct iio_chan_spec *)indio_dev->channels,
 328                                    HID_USAGE_SENSOR_GYRO_3D, gyro_state);
 329         if (ret) {
 330                 dev_err(&pdev->dev, "failed to setup attributes\n");
 331                 goto error_free_dev_mem;
 332         }
 333
 334         indio_dev->num_channels = ARRAY_SIZE(gyro_3d_channels);
 335         indio_dev->dev.parent = &pdev->dev;
 336         indio_dev->info = &gyro_3d_info;
 337         indio_dev->name = name;
 338         indio_dev->modes = INDIO_DIRECT_MODE;
 339
 340         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 341                 NULL, NULL);
 342         if (ret) {
 343                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 344                 goto error_free_dev_mem;
 345         }
 346         atomic_set(&gyro_state->common_attributes.data_ready, 0);
 347         ret = hid_sensor_setup_trigger(indio_dev, name,
 348                                         &gyro_state->common_attributes);
 349         if (ret < 0) {
 350                 dev_err(&pdev->dev, "trigger setup failed\n");
 351                 goto error_unreg_buffer_funcs;
 352         }
 353
 354         ret = iio_device_register(indio_dev);
 355         if (ret) {
 356                 dev_err(&pdev->dev, "device register failed\n");
 357                 goto error_remove_trigger;
 358         }
 359
 360         gyro_state->callbacks.send_event = gyro_3d_proc_event;
 361         gyro_state->callbacks.capture_sample = gyro_3d_capture_sample;
 362         gyro_state->callbacks.pdev = pdev;
 363         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D,
 364                                         &gyro_state->callbacks);
 365         if (ret < 0) {
 366                 dev_err(&pdev->dev, "callback reg failed\n");
 367                 goto error_iio_unreg;
 368         }
 369
 370         return ret;
 371
 372 error_iio_unreg:
 373         iio_device_unregister(indio_dev);
 374 error_remove_trigger:
 375         hid_sensor_remove_trigger(&gyro_state->common_attributes);
 376 error_unreg_buffer_funcs:
 377         iio_triggered_buffer_cleanup(indio_dev);
 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_gyro_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 gyro_3d_state *gyro_state = iio_priv(indio_dev);
 389
 390         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_GYRO_3D);
 391         iio_device_unregister(indio_dev);
 392         hid_sensor_remove_trigger(&gyro_state->common_attributes);
 393         iio_triggered_buffer_cleanup(indio_dev);
 394         kfree(indio_dev->channels);
 395
 396         return 0;
 397 }
 398
 399 static const struct platform_device_id hid_gyro_3d_ids[] = {
 400         {
 401                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 402                 .name = "HID-SENSOR-200076",
 403         },
 404         { /* sentinel */ }
 405 };
 406 MODULE_DEVICE_TABLE(platform, hid_gyro_3d_ids);
 407
 408 static struct platform_driver hid_gyro_3d_platform_driver = {
 409         .id_table = hid_gyro_3d_ids,
 410         .driver = {
 411                 .name   = KBUILD_MODNAME,
 412                 .pm     = &hid_sensor_pm_ops,
 413         },
 414         .probe          = hid_gyro_3d_probe,
 415         .remove         = hid_gyro_3d_remove,
 416 };
 417 module_platform_driver(hid_gyro_3d_platform_driver);
 418
 419 MODULE_DESCRIPTION("HID Sensor Gyroscope 3D");
 420 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 421 MODULE_LICENSE("GPL");