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

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