drivers/iio/orientation/hid-sensor-rotation.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2014, Intel Corporation.
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/module.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/irq.h>
  12 #include <linux/slab.h>
  13 #include <linux/hid-sensor-hub.h>
  14 #include <linux/iio/iio.h>
  15 #include <linux/iio/sysfs.h>
  16 #include <linux/iio/buffer.h>
  17 #include "../common/hid-sensors/hid-sensor-trigger.h"
  18
  19 struct dev_rot_state {
  20         struct hid_sensor_hub_callbacks callbacks;
  21         struct hid_sensor_common common_attributes;
  22         struct hid_sensor_hub_attribute_info quaternion;
  23         u32 sampled_vals[4];
  24         int scale_pre_decml;
  25         int scale_post_decml;
  26         int scale_precision;
  27         int value_offset;
  28 };
  29
  30 /* Channel definitions */
  31 static const struct iio_chan_spec dev_rot_channels[] = {
  32         {
  33                 .type = IIO_ROT,
  34                 .modified = 1,
  35                 .channel2 = IIO_MOD_QUATERNION,
  36                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  37                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  38                                         BIT(IIO_CHAN_INFO_OFFSET) |
  39                                         BIT(IIO_CHAN_INFO_SCALE) |
  40                                         BIT(IIO_CHAN_INFO_HYSTERESIS)
  41         }
  42 };
  43
  44 /* Adjust channel real bits based on report descriptor */
  45 static void dev_rot_adjust_channel_bit_mask(struct iio_chan_spec *chan,
  46                                                 int size)
  47 {
  48         chan->scan_type.sign = 's';
  49         /* Real storage bits will change based on the report desc. */
  50         chan->scan_type.realbits = size * 8;
  51         /* Maximum size of a sample to capture is u32 */
  52         chan->scan_type.storagebits = sizeof(u32) * 8;
  53         chan->scan_type.repeat = 4;
  54 }
  55
  56 /* Channel read_raw handler */
  57 static int dev_rot_read_raw(struct iio_dev *indio_dev,
  58                                 struct iio_chan_spec const *chan,
  59                                 int size, int *vals, int *val_len,
  60                                 long mask)
  61 {
  62         struct dev_rot_state *rot_state = iio_priv(indio_dev);
  63         int ret_type;
  64         int i;
  65
  66         vals[0] = 0;
  67         vals[1] = 0;
  68
  69         switch (mask) {
  70         case IIO_CHAN_INFO_RAW:
  71                 if (size >= 4) {
  72                         for (i = 0; i < 4; ++i)
  73                                 vals[i] = rot_state->sampled_vals[i];
  74                         ret_type = IIO_VAL_INT_MULTIPLE;
  75                         *val_len =  4;
  76                 } else
  77                         ret_type = -EINVAL;
  78                 break;
  79         case IIO_CHAN_INFO_SCALE:
  80                 vals[0] = rot_state->scale_pre_decml;
  81                 vals[1] = rot_state->scale_post_decml;
  82                 return rot_state->scale_precision;
  83
  84         case IIO_CHAN_INFO_OFFSET:
  85                 *vals = rot_state->value_offset;
  86                 return IIO_VAL_INT;
  87
  88         case IIO_CHAN_INFO_SAMP_FREQ:
  89                 ret_type = hid_sensor_read_samp_freq_value(
  90                         &rot_state->common_attributes, &vals[0], &vals[1]);
  91                 break;
  92         case IIO_CHAN_INFO_HYSTERESIS:
  93                 ret_type = hid_sensor_read_raw_hyst_value(
  94                         &rot_state->common_attributes, &vals[0], &vals[1]);
  95                 break;
  96         default:
  97                 ret_type = -EINVAL;
  98                 break;
  99         }
 100
 101         return ret_type;
 102 }
 103
 104 /* Channel write_raw handler */
 105 static int dev_rot_write_raw(struct iio_dev *indio_dev,
 106                                struct iio_chan_spec const *chan,
 107                                int val,
 108                                int val2,
 109                                long mask)
 110 {
 111         struct dev_rot_state *rot_state = iio_priv(indio_dev);
 112         int ret;
 113
 114         switch (mask) {
 115         case IIO_CHAN_INFO_SAMP_FREQ:
 116                 ret = hid_sensor_write_samp_freq_value(
 117                                 &rot_state->common_attributes, val, val2);
 118                 break;
 119         case IIO_CHAN_INFO_HYSTERESIS:
 120                 ret = hid_sensor_write_raw_hyst_value(
 121                                 &rot_state->common_attributes, val, val2);
 122                 break;
 123         default:
 124                 ret = -EINVAL;
 125         }
 126
 127         return ret;
 128 }
 129
 130 static const struct iio_info dev_rot_info = {
 131         .read_raw_multi = &dev_rot_read_raw,
 132         .write_raw = &dev_rot_write_raw,
 133 };
 134
 135 /* Function to push data to buffer */
 136 static void hid_sensor_push_data(struct iio_dev *indio_dev, u8 *data, int len)
 137 {
 138         dev_dbg(&indio_dev->dev, "hid_sensor_push_data >>\n");
 139         iio_push_to_buffers(indio_dev, (u8 *)data);
 140         dev_dbg(&indio_dev->dev, "hid_sensor_push_data <<\n");
 141
 142 }
 143
 144 /* Callback handler to send event after all samples are received and captured */
 145 static int dev_rot_proc_event(struct hid_sensor_hub_device *hsdev,
 146                                 unsigned usage_id,
 147                                 void *priv)
 148 {
 149         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 150         struct dev_rot_state *rot_state = iio_priv(indio_dev);
 151
 152         dev_dbg(&indio_dev->dev, "dev_rot_proc_event\n");
 153         if (atomic_read(&rot_state->common_attributes.data_ready))
 154                 hid_sensor_push_data(indio_dev,
 155                                 (u8 *)rot_state->sampled_vals,
 156                                 sizeof(rot_state->sampled_vals));
 157
 158         return 0;
 159 }
 160
 161 /* Capture samples in local storage */
 162 static int dev_rot_capture_sample(struct hid_sensor_hub_device *hsdev,
 163                                 unsigned usage_id,
 164                                 size_t raw_len, char *raw_data,
 165                                 void *priv)
 166 {
 167         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 168         struct dev_rot_state *rot_state = iio_priv(indio_dev);
 169
 170         if (usage_id == HID_USAGE_SENSOR_ORIENT_QUATERNION) {
 171                 memcpy(rot_state->sampled_vals, raw_data,
 172                                         sizeof(rot_state->sampled_vals));
 173                 dev_dbg(&indio_dev->dev, "Recd Quat len:%zu::%zu\n", raw_len,
 174                                         sizeof(rot_state->sampled_vals));
 175         }
 176
 177         return 0;
 178 }
 179
 180 /* Parse report which is specific to an usage id*/
 181 static int dev_rot_parse_report(struct platform_device *pdev,
 182                                 struct hid_sensor_hub_device *hsdev,
 183                                 struct iio_chan_spec *channels,
 184                                 unsigned usage_id,
 185                                 struct dev_rot_state *st)
 186 {
 187         int ret;
 188
 189         ret = sensor_hub_input_get_attribute_info(hsdev,
 190                                 HID_INPUT_REPORT,
 191                                 usage_id,
 192                                 HID_USAGE_SENSOR_ORIENT_QUATERNION,
 193                                 &st->quaternion);
 194         if (ret)
 195                 return ret;
 196
 197         dev_rot_adjust_channel_bit_mask(&channels[0],
 198                 st->quaternion.size / 4);
 199
 200         dev_dbg(&pdev->dev, "dev_rot %x:%x\n", st->quaternion.index,
 201                 st->quaternion.report_id);
 202
 203         dev_dbg(&pdev->dev, "dev_rot: attrib size %d\n",
 204                                 st->quaternion.size);
 205
 206         st->scale_precision = hid_sensor_format_scale(
 207                                 hsdev->usage,
 208                                 &st->quaternion,
 209                                 &st->scale_pre_decml, &st->scale_post_decml);
 210
 211         /* Set Sensitivity field ids, when there is no individual modifier */
 212         if (st->common_attributes.sensitivity.index < 0) {
 213                 sensor_hub_input_get_attribute_info(hsdev,
 214                         HID_FEATURE_REPORT, usage_id,
 215                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 216                         HID_USAGE_SENSOR_DATA_ORIENTATION,
 217                         &st->common_attributes.sensitivity);
 218                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 219                         st->common_attributes.sensitivity.index,
 220                         st->common_attributes.sensitivity.report_id);
 221         }
 222
 223         return 0;
 224 }
 225
 226 /* Function to initialize the processing for usage id */
 227 static int hid_dev_rot_probe(struct platform_device *pdev)
 228 {
 229         int ret;
 230         char *name;
 231         struct iio_dev *indio_dev;
 232         struct dev_rot_state *rot_state;
 233         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 234
 235         indio_dev = devm_iio_device_alloc(&pdev->dev,
 236                                           sizeof(struct dev_rot_state));
 237         if (indio_dev == NULL)
 238                 return -ENOMEM;
 239
 240         platform_set_drvdata(pdev, indio_dev);
 241
 242         rot_state = iio_priv(indio_dev);
 243         rot_state->common_attributes.hsdev = hsdev;
 244         rot_state->common_attributes.pdev = pdev;
 245
 246         switch (hsdev->usage) {
 247         case HID_USAGE_SENSOR_DEVICE_ORIENTATION:
 248                 name = "dev_rotation";
 249                 break;
 250         case HID_USAGE_SENSOR_RELATIVE_ORIENTATION:
 251                 name = "relative_orientation";
 252                 break;
 253         case HID_USAGE_SENSOR_GEOMAGNETIC_ORIENTATION:
 254                 name = "geomagnetic_orientation";
 255                 break;
 256         default:
 257                 return -EINVAL;
 258         }
 259
 260         ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage,
 261                                 &rot_state->common_attributes);
 262         if (ret) {
 263                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 264                 return ret;
 265         }
 266
 267         indio_dev->channels = devm_kmemdup(&pdev->dev, dev_rot_channels,
 268                                            sizeof(dev_rot_channels),
 269                                            GFP_KERNEL);
 270         if (!indio_dev->channels) {
 271                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 272                 return -ENOMEM;
 273         }
 274
 275         ret = dev_rot_parse_report(pdev, hsdev,
 276                                    (struct iio_chan_spec *)indio_dev->channels,
 277                                         hsdev->usage, rot_state);
 278         if (ret) {
 279                 dev_err(&pdev->dev, "failed to setup attributes\n");
 280                 return ret;
 281         }
 282
 283         indio_dev->num_channels = ARRAY_SIZE(dev_rot_channels);
 284         indio_dev->info = &dev_rot_info;
 285         indio_dev->name = name;
 286         indio_dev->modes = INDIO_DIRECT_MODE;
 287
 288         atomic_set(&rot_state->common_attributes.data_ready, 0);
 289
 290         ret = hid_sensor_setup_trigger(indio_dev, name,
 291                                         &rot_state->common_attributes);
 292         if (ret) {
 293                 dev_err(&pdev->dev, "trigger setup failed\n");
 294                 return ret;
 295         }
 296
 297         ret = iio_device_register(indio_dev);
 298         if (ret) {
 299                 dev_err(&pdev->dev, "device register failed\n");
 300                 goto error_remove_trigger;
 301         }
 302
 303         rot_state->callbacks.send_event = dev_rot_proc_event;
 304         rot_state->callbacks.capture_sample = dev_rot_capture_sample;
 305         rot_state->callbacks.pdev = pdev;
 306         ret = sensor_hub_register_callback(hsdev, hsdev->usage,
 307                                         &rot_state->callbacks);
 308         if (ret) {
 309                 dev_err(&pdev->dev, "callback reg failed\n");
 310                 goto error_iio_unreg;
 311         }
 312
 313         return 0;
 314
 315 error_iio_unreg:
 316         iio_device_unregister(indio_dev);
 317 error_remove_trigger:
 318         hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
 319         return ret;
 320 }
 321
 322 /* Function to deinitialize the processing for usage id */
 323 static int hid_dev_rot_remove(struct platform_device *pdev)
 324 {
 325         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 326         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 327         struct dev_rot_state *rot_state = iio_priv(indio_dev);
 328
 329         sensor_hub_remove_callback(hsdev, hsdev->usage);
 330         iio_device_unregister(indio_dev);
 331         hid_sensor_remove_trigger(indio_dev, &rot_state->common_attributes);
 332
 333         return 0;
 334 }
 335
 336 static const struct platform_device_id hid_dev_rot_ids[] = {
 337         {
 338                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 339                 .name = "HID-SENSOR-20008a",
 340         },
 341         {
 342                 /* Relative orientation(AG) sensor */
 343                 .name = "HID-SENSOR-20008e",
 344         },
 345         {
 346                 /* Geomagnetic orientation(AM) sensor */
 347                 .name = "HID-SENSOR-2000c1",
 348         },
 349         { /* sentinel */ }
 350 };
 351 MODULE_DEVICE_TABLE(platform, hid_dev_rot_ids);
 352
 353 static struct platform_driver hid_dev_rot_platform_driver = {
 354         .id_table = hid_dev_rot_ids,
 355         .driver = {
 356                 .name   = KBUILD_MODNAME,
 357                 .pm     = &hid_sensor_pm_ops,
 358         },
 359         .probe          = hid_dev_rot_probe,
 360         .remove         = hid_dev_rot_remove,
 361 };
 362 module_platform_driver(hid_dev_rot_platform_driver);
 363
 364 MODULE_DESCRIPTION("HID Sensor Device Rotation");
 365 MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>");
 366 MODULE_LICENSE("GPL");