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