drivers/iio/light/hid-sensor-prox.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  * You should have received a copy of the GNU General Public License along with
  15  * this program.
  16  *
  17  */
  18 #include <linux/device.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/module.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/slab.h>
  24 #include <linux/hid-sensor-hub.h>
  25 #include <linux/iio/iio.h>
  26 #include <linux/iio/sysfs.h>
  27 #include <linux/iio/buffer.h>
  28 #include <linux/iio/trigger_consumer.h>
  29 #include <linux/iio/triggered_buffer.h>
  30 #include "../common/hid-sensors/hid-sensor-trigger.h"
  31
  32 #define CHANNEL_SCAN_INDEX_PRESENCE 0
  33
  34 struct prox_state {
  35         struct hid_sensor_hub_callbacks callbacks;
  36         struct hid_sensor_common common_attributes;
  37         struct hid_sensor_hub_attribute_info prox_attr;
  38         u32 human_presence;
  39 };
  40
  41 /* Channel definitions */
  42 static const struct iio_chan_spec prox_channels[] = {
  43         {
  44                 .type = IIO_PROXIMITY,
  45                 .modified = 1,
  46                 .channel2 = IIO_NO_MOD,
  47                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  48                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  49                 BIT(IIO_CHAN_INFO_SCALE) |
  50                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  51                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  52                 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE,
  53         }
  54 };
  55
  56 /* Adjust channel real bits based on report descriptor */
  57 static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels,
  58                                         int channel, int size)
  59 {
  60         channels[channel].scan_type.sign = 's';
  61         /* Real storage bits will change based on the report desc. */
  62         channels[channel].scan_type.realbits = size * 8;
  63         /* Maximum size of a sample to capture is u32 */
  64         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
  65 }
  66
  67 /* Channel read_raw handler */
  68 static int prox_read_raw(struct iio_dev *indio_dev,
  69                               struct iio_chan_spec const *chan,
  70                               int *val, int *val2,
  71                               long mask)
  72 {
  73         struct prox_state *prox_state = iio_priv(indio_dev);
  74         int report_id = -1;
  75         u32 address;
  76         int ret;
  77         int ret_type;
  78
  79         *val = 0;
  80         *val2 = 0;
  81         switch (mask) {
  82         case IIO_CHAN_INFO_RAW:
  83                 switch (chan->scan_index) {
  84                 case  CHANNEL_SCAN_INDEX_PRESENCE:
  85                         report_id = prox_state->prox_attr.report_id;
  86                         address =
  87                         HID_USAGE_SENSOR_HUMAN_PRESENCE;
  88                         break;
  89                 default:
  90                         report_id = -1;
  91                         break;
  92                 }
  93                 if (report_id >= 0)
  94                         *val = sensor_hub_input_attr_get_raw_value(
  95                                 prox_state->common_attributes.hsdev,
  96                                 HID_USAGE_SENSOR_PROX, address,
  97                                 report_id);
  98                 else {
  99                         *val = 0;
 100                         return -EINVAL;
 101                 }
 102                 ret_type = IIO_VAL_INT;
 103                 break;
 104         case IIO_CHAN_INFO_SCALE:
 105                 *val = prox_state->prox_attr.units;
 106                 ret_type = IIO_VAL_INT;
 107                 break;
 108         case IIO_CHAN_INFO_OFFSET:
 109                 *val = hid_sensor_convert_exponent(
 110                                 prox_state->prox_attr.unit_expo);
 111                 ret_type = IIO_VAL_INT;
 112                 break;
 113         case IIO_CHAN_INFO_SAMP_FREQ:
 114                 ret = hid_sensor_read_samp_freq_value(
 115                                 &prox_state->common_attributes, val, val2);
 116                 ret_type = IIO_VAL_INT_PLUS_MICRO;
 117                 break;
 118         case IIO_CHAN_INFO_HYSTERESIS:
 119                 ret = hid_sensor_read_raw_hyst_value(
 120                                 &prox_state->common_attributes, val, val2);
 121                 ret_type = IIO_VAL_INT_PLUS_MICRO;
 122                 break;
 123         default:
 124                 ret_type = -EINVAL;
 125                 break;
 126         }
 127
 128         return ret_type;
 129 }
 130
 131 /* Channel write_raw handler */
 132 static int prox_write_raw(struct iio_dev *indio_dev,
 133                                struct iio_chan_spec const *chan,
 134                                int val,
 135                                int val2,
 136                                long mask)
 137 {
 138         struct prox_state *prox_state = iio_priv(indio_dev);
 139         int ret = 0;
 140
 141         switch (mask) {
 142         case IIO_CHAN_INFO_SAMP_FREQ:
 143                 ret = hid_sensor_write_samp_freq_value(
 144                                 &prox_state->common_attributes, val, val2);
 145                 break;
 146         case IIO_CHAN_INFO_HYSTERESIS:
 147                 ret = hid_sensor_write_raw_hyst_value(
 148                                 &prox_state->common_attributes, val, val2);
 149                 break;
 150         default:
 151                 ret = -EINVAL;
 152         }
 153
 154         return ret;
 155 }
 156
 157 static const struct iio_info prox_info = {
 158         .driver_module = THIS_MODULE,
 159         .read_raw = &prox_read_raw,
 160         .write_raw = &prox_write_raw,
 161 };
 162
 163 /* Function to push data to buffer */
 164 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
 165                                         int len)
 166 {
 167         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 168         iio_push_to_buffers(indio_dev, data);
 169 }
 170
 171 /* Callback handler to send event after all samples are received and captured */
 172 static int prox_proc_event(struct hid_sensor_hub_device *hsdev,
 173                                 unsigned usage_id,
 174                                 void *priv)
 175 {
 176         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 177         struct prox_state *prox_state = iio_priv(indio_dev);
 178
 179         dev_dbg(&indio_dev->dev, "prox_proc_event [%d]\n",
 180                                 prox_state->common_attributes.data_ready);
 181         if (prox_state->common_attributes.data_ready)
 182                 hid_sensor_push_data(indio_dev,
 183                                 &prox_state->human_presence,
 184                                 sizeof(prox_state->human_presence));
 185
 186         return 0;
 187 }
 188
 189 /* Capture samples in local storage */
 190 static int prox_capture_sample(struct hid_sensor_hub_device *hsdev,
 191                                 unsigned usage_id,
 192                                 size_t raw_len, char *raw_data,
 193                                 void *priv)
 194 {
 195         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 196         struct prox_state *prox_state = iio_priv(indio_dev);
 197         int ret = -EINVAL;
 198
 199         switch (usage_id) {
 200         case HID_USAGE_SENSOR_HUMAN_PRESENCE:
 201                 prox_state->human_presence = *(u32 *)raw_data;
 202                 ret = 0;
 203                 break;
 204         default:
 205                 break;
 206         }
 207
 208         return ret;
 209 }
 210
 211 /* Parse report which is specific to an usage id*/
 212 static int prox_parse_report(struct platform_device *pdev,
 213                                 struct hid_sensor_hub_device *hsdev,
 214                                 struct iio_chan_spec *channels,
 215                                 unsigned usage_id,
 216                                 struct prox_state *st)
 217 {
 218         int ret;
 219
 220         ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
 221                         usage_id,
 222                         HID_USAGE_SENSOR_HUMAN_PRESENCE,
 223                         &st->prox_attr);
 224         if (ret < 0)
 225                 return ret;
 226         prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE,
 227                                         st->prox_attr.size);
 228
 229         dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
 230                         st->prox_attr.report_id);
 231
 232         /* Set Sensitivity field ids, when there is no individual modifier */
 233         if (st->common_attributes.sensitivity.index < 0) {
 234                 sensor_hub_input_get_attribute_info(hsdev,
 235                         HID_FEATURE_REPORT, usage_id,
 236                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 237                         HID_USAGE_SENSOR_DATA_PRESENCE,
 238                         &st->common_attributes.sensitivity);
 239                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 240                         st->common_attributes.sensitivity.index,
 241                         st->common_attributes.sensitivity.report_id);
 242         }
 243         return ret;
 244 }
 245
 246 /* Function to initialize the processing for usage id */
 247 static int hid_prox_probe(struct platform_device *pdev)
 248 {
 249         int ret = 0;
 250         static const char *name = "prox";
 251         struct iio_dev *indio_dev;
 252         struct prox_state *prox_state;
 253         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 254         struct iio_chan_spec *channels;
 255
 256         indio_dev = devm_iio_device_alloc(&pdev->dev,
 257                                 sizeof(struct prox_state));
 258         if (!indio_dev)
 259                 return -ENOMEM;
 260         platform_set_drvdata(pdev, indio_dev);
 261
 262         prox_state = iio_priv(indio_dev);
 263         prox_state->common_attributes.hsdev = hsdev;
 264         prox_state->common_attributes.pdev = pdev;
 265
 266         ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX,
 267                                         &prox_state->common_attributes);
 268         if (ret) {
 269                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 270                 return ret;
 271         }
 272
 273         channels = kmemdup(prox_channels, sizeof(prox_channels), GFP_KERNEL);
 274         if (!channels) {
 275                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 276                 return -ENOMEM;
 277         }
 278
 279         ret = prox_parse_report(pdev, hsdev, channels,
 280                                 HID_USAGE_SENSOR_PROX, prox_state);
 281         if (ret) {
 282                 dev_err(&pdev->dev, "failed to setup attributes\n");
 283                 goto error_free_dev_mem;
 284         }
 285
 286         indio_dev->channels = channels;
 287         indio_dev->num_channels =
 288                                 ARRAY_SIZE(prox_channels);
 289         indio_dev->dev.parent = &pdev->dev;
 290         indio_dev->info = &prox_info;
 291         indio_dev->name = name;
 292         indio_dev->modes = INDIO_DIRECT_MODE;
 293
 294         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 295                 NULL, NULL);
 296         if (ret) {
 297                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 298                 goto error_free_dev_mem;
 299         }
 300         prox_state->common_attributes.data_ready = false;
 301         ret = hid_sensor_setup_trigger(indio_dev, name,
 302                                 &prox_state->common_attributes);
 303         if (ret) {
 304                 dev_err(&pdev->dev, "trigger setup failed\n");
 305                 goto error_unreg_buffer_funcs;
 306         }
 307
 308         ret = iio_device_register(indio_dev);
 309         if (ret) {
 310                 dev_err(&pdev->dev, "device register failed\n");
 311                 goto error_remove_trigger;
 312         }
 313
 314         prox_state->callbacks.send_event = prox_proc_event;
 315         prox_state->callbacks.capture_sample = prox_capture_sample;
 316         prox_state->callbacks.pdev = pdev;
 317         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX,
 318                                         &prox_state->callbacks);
 319         if (ret < 0) {
 320                 dev_err(&pdev->dev, "callback reg failed\n");
 321                 goto error_iio_unreg;
 322         }
 323
 324         return ret;
 325
 326 error_iio_unreg:
 327         iio_device_unregister(indio_dev);
 328 error_remove_trigger:
 329         hid_sensor_remove_trigger(&prox_state->common_attributes);
 330 error_unreg_buffer_funcs:
 331         iio_triggered_buffer_cleanup(indio_dev);
 332 error_free_dev_mem:
 333         kfree(indio_dev->channels);
 334         return ret;
 335 }
 336
 337 /* Function to deinitialize the processing for usage id */
 338 static int hid_prox_remove(struct platform_device *pdev)
 339 {
 340         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 341         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 342         struct prox_state *prox_state = iio_priv(indio_dev);
 343
 344         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX);
 345         iio_device_unregister(indio_dev);
 346         hid_sensor_remove_trigger(&prox_state->common_attributes);
 347         iio_triggered_buffer_cleanup(indio_dev);
 348         kfree(indio_dev->channels);
 349
 350         return 0;
 351 }
 352
 353 static struct platform_device_id hid_prox_ids[] = {
 354         {
 355                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 356                 .name = "HID-SENSOR-200011",
 357         },
 358         { /* sentinel */ }
 359 };
 360 MODULE_DEVICE_TABLE(platform, hid_prox_ids);
 361
 362 static struct platform_driver hid_prox_platform_driver = {
 363         .id_table = hid_prox_ids,
 364         .driver = {
 365                 .name   = KBUILD_MODNAME,
 366                 .owner  = THIS_MODULE,
 367         },
 368         .probe          = hid_prox_probe,
 369         .remove         = hid_prox_remove,
 370 };
 371 module_platform_driver(hid_prox_platform_driver);
 372
 373 MODULE_DESCRIPTION("HID Sensor Proximity");
 374 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
 375 MODULE_LICENSE("GPL");