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/delay.h>
  25 #include <linux/hid-sensor-hub.h>
  26 #include <linux/iio/iio.h>
  27 #include <linux/iio/sysfs.h>
  28 #include <linux/iio/buffer.h>
  29 #include <linux/iio/trigger_consumer.h>
  30 #include <linux/iio/triggered_buffer.h>
  31 #include "../common/hid-sensors/hid-sensor-trigger.h"
  32
  33 #define CHANNEL_SCAN_INDEX_PRESENCE 0
  34
  35 struct prox_state {
  36         struct hid_sensor_hub_callbacks callbacks;
  37         struct hid_sensor_common common_attributes;
  38         struct hid_sensor_hub_attribute_info prox_attr;
  39         u32 human_presence;
  40 };
  41
  42 /* Channel definitions */
  43 static const struct iio_chan_spec prox_channels[] = {
  44         {
  45                 .type = IIO_PROXIMITY,
  46                 .modified = 1,
  47                 .channel2 = IIO_NO_MOD,
  48                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  49                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  50                 BIT(IIO_CHAN_INFO_SCALE) |
  51                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  52                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  53                 .scan_index = CHANNEL_SCAN_INDEX_PRESENCE,
  54         }
  55 };
  56
  57 /* Adjust channel real bits based on report descriptor */
  58 static void prox_adjust_channel_bit_mask(struct iio_chan_spec *channels,
  59                                         int channel, int size)
  60 {
  61         channels[channel].scan_type.sign = 's';
  62         /* Real storage bits will change based on the report desc. */
  63         channels[channel].scan_type.realbits = size * 8;
  64         /* Maximum size of a sample to capture is u32 */
  65         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
  66 }
  67
  68 /* Channel read_raw handler */
  69 static int prox_read_raw(struct iio_dev *indio_dev,
  70                               struct iio_chan_spec const *chan,
  71                               int *val, int *val2,
  72                               long mask)
  73 {
  74         struct prox_state *prox_state = iio_priv(indio_dev);
  75         int report_id = -1;
  76         u32 address;
  77         int ret_type;
  78         s32 poll_value;
  79
  80         *val = 0;
  81         *val2 = 0;
  82         switch (mask) {
  83         case IIO_CHAN_INFO_RAW:
  84                 switch (chan->scan_index) {
  85                 case  CHANNEL_SCAN_INDEX_PRESENCE:
  86                         report_id = prox_state->prox_attr.report_id;
  87                         address =
  88                         HID_USAGE_SENSOR_HUMAN_PRESENCE;
  89                         break;
  90                 default:
  91                         report_id = -1;
  92                         break;
  93                 }
  94                 if (report_id >= 0) {
  95                         poll_value = hid_sensor_read_poll_value(
  96                                         &prox_state->common_attributes);
  97                         if (poll_value < 0)
  98                                 return -EINVAL;
  99
 100                         hid_sensor_power_state(&prox_state->common_attributes,
 101                                                 true);
 102
 103                         msleep_interruptible(poll_value * 2);
 104
 105                         *val = sensor_hub_input_attr_get_raw_value(
 106                                 prox_state->common_attributes.hsdev,
 107                                 HID_USAGE_SENSOR_PROX, address,
 108                                 report_id);
 109                         hid_sensor_power_state(&prox_state->common_attributes,
 110                                                 false);
 111                 } else {
 112                         *val = 0;
 113                         return -EINVAL;
 114                 }
 115                 ret_type = IIO_VAL_INT;
 116                 break;
 117         case IIO_CHAN_INFO_SCALE:
 118                 *val = prox_state->prox_attr.units;
 119                 ret_type = IIO_VAL_INT;
 120                 break;
 121         case IIO_CHAN_INFO_OFFSET:
 122                 *val = hid_sensor_convert_exponent(
 123                                 prox_state->prox_attr.unit_expo);
 124                 ret_type = IIO_VAL_INT;
 125                 break;
 126         case IIO_CHAN_INFO_SAMP_FREQ:
 127                 ret_type = hid_sensor_read_samp_freq_value(
 128                                 &prox_state->common_attributes, val, val2);
 129                 break;
 130         case IIO_CHAN_INFO_HYSTERESIS:
 131                 ret_type = hid_sensor_read_raw_hyst_value(
 132                                 &prox_state->common_attributes, val, val2);
 133                 break;
 134         default:
 135                 ret_type = -EINVAL;
 136                 break;
 137         }
 138
 139         return ret_type;
 140 }
 141
 142 /* Channel write_raw handler */
 143 static int prox_write_raw(struct iio_dev *indio_dev,
 144                                struct iio_chan_spec const *chan,
 145                                int val,
 146                                int val2,
 147                                long mask)
 148 {
 149         struct prox_state *prox_state = iio_priv(indio_dev);
 150         int ret = 0;
 151
 152         switch (mask) {
 153         case IIO_CHAN_INFO_SAMP_FREQ:
 154                 ret = hid_sensor_write_samp_freq_value(
 155                                 &prox_state->common_attributes, val, val2);
 156                 break;
 157         case IIO_CHAN_INFO_HYSTERESIS:
 158                 ret = hid_sensor_write_raw_hyst_value(
 159                                 &prox_state->common_attributes, val, val2);
 160                 break;
 161         default:
 162                 ret = -EINVAL;
 163         }
 164
 165         return ret;
 166 }
 167
 168 static const struct iio_info prox_info = {
 169         .driver_module = THIS_MODULE,
 170         .read_raw = &prox_read_raw,
 171         .write_raw = &prox_write_raw,
 172 };
 173
 174 /* Function to push data to buffer */
 175 static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
 176                                         int len)
 177 {
 178         dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
 179         iio_push_to_buffers(indio_dev, data);
 180 }
 181
 182 /* Callback handler to send event after all samples are received and captured */
 183 static int prox_proc_event(struct hid_sensor_hub_device *hsdev,
 184                                 unsigned usage_id,
 185                                 void *priv)
 186 {
 187         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 188         struct prox_state *prox_state = iio_priv(indio_dev);
 189
 190         dev_dbg(&indio_dev->dev, "prox_proc_event\n");
 191         if (atomic_read(&prox_state->common_attributes.data_ready))
 192                 hid_sensor_push_data(indio_dev,
 193                                 &prox_state->human_presence,
 194                                 sizeof(prox_state->human_presence));
 195
 196         return 0;
 197 }
 198
 199 /* Capture samples in local storage */
 200 static int prox_capture_sample(struct hid_sensor_hub_device *hsdev,
 201                                 unsigned usage_id,
 202                                 size_t raw_len, char *raw_data,
 203                                 void *priv)
 204 {
 205         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 206         struct prox_state *prox_state = iio_priv(indio_dev);
 207         int ret = -EINVAL;
 208
 209         switch (usage_id) {
 210         case HID_USAGE_SENSOR_HUMAN_PRESENCE:
 211                 prox_state->human_presence = *(u32 *)raw_data;
 212                 ret = 0;
 213                 break;
 214         default:
 215                 break;
 216         }
 217
 218         return ret;
 219 }
 220
 221 /* Parse report which is specific to an usage id*/
 222 static int prox_parse_report(struct platform_device *pdev,
 223                                 struct hid_sensor_hub_device *hsdev,
 224                                 struct iio_chan_spec *channels,
 225                                 unsigned usage_id,
 226                                 struct prox_state *st)
 227 {
 228         int ret;
 229
 230         ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
 231                         usage_id,
 232                         HID_USAGE_SENSOR_HUMAN_PRESENCE,
 233                         &st->prox_attr);
 234         if (ret < 0)
 235                 return ret;
 236         prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE,
 237                                         st->prox_attr.size);
 238
 239         dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
 240                         st->prox_attr.report_id);
 241
 242         /* Set Sensitivity field ids, when there is no individual modifier */
 243         if (st->common_attributes.sensitivity.index < 0) {
 244                 sensor_hub_input_get_attribute_info(hsdev,
 245                         HID_FEATURE_REPORT, usage_id,
 246                         HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
 247                         HID_USAGE_SENSOR_DATA_PRESENCE,
 248                         &st->common_attributes.sensitivity);
 249                 dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
 250                         st->common_attributes.sensitivity.index,
 251                         st->common_attributes.sensitivity.report_id);
 252         }
 253         return ret;
 254 }
 255
 256 /* Function to initialize the processing for usage id */
 257 static int hid_prox_probe(struct platform_device *pdev)
 258 {
 259         int ret = 0;
 260         static const char *name = "prox";
 261         struct iio_dev *indio_dev;
 262         struct prox_state *prox_state;
 263         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 264         struct iio_chan_spec *channels;
 265
 266         indio_dev = devm_iio_device_alloc(&pdev->dev,
 267                                 sizeof(struct prox_state));
 268         if (!indio_dev)
 269                 return -ENOMEM;
 270         platform_set_drvdata(pdev, indio_dev);
 271
 272         prox_state = iio_priv(indio_dev);
 273         prox_state->common_attributes.hsdev = hsdev;
 274         prox_state->common_attributes.pdev = pdev;
 275
 276         ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX,
 277                                         &prox_state->common_attributes);
 278         if (ret) {
 279                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 280                 return ret;
 281         }
 282
 283         channels = kmemdup(prox_channels, sizeof(prox_channels), GFP_KERNEL);
 284         if (!channels) {
 285                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 286                 return -ENOMEM;
 287         }
 288
 289         ret = prox_parse_report(pdev, hsdev, channels,
 290                                 HID_USAGE_SENSOR_PROX, prox_state);
 291         if (ret) {
 292                 dev_err(&pdev->dev, "failed to setup attributes\n");
 293                 goto error_free_dev_mem;
 294         }
 295
 296         indio_dev->channels = channels;
 297         indio_dev->num_channels =
 298                                 ARRAY_SIZE(prox_channels);
 299         indio_dev->dev.parent = &pdev->dev;
 300         indio_dev->info = &prox_info;
 301         indio_dev->name = name;
 302         indio_dev->modes = INDIO_DIRECT_MODE;
 303
 304         ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
 305                 NULL, NULL);
 306         if (ret) {
 307                 dev_err(&pdev->dev, "failed to initialize trigger buffer\n");
 308                 goto error_free_dev_mem;
 309         }
 310         atomic_set(&prox_state->common_attributes.data_ready, 0);
 311         ret = hid_sensor_setup_trigger(indio_dev, name,
 312                                 &prox_state->common_attributes);
 313         if (ret) {
 314                 dev_err(&pdev->dev, "trigger setup failed\n");
 315                 goto error_unreg_buffer_funcs;
 316         }
 317
 318         ret = iio_device_register(indio_dev);
 319         if (ret) {
 320                 dev_err(&pdev->dev, "device register failed\n");
 321                 goto error_remove_trigger;
 322         }
 323
 324         prox_state->callbacks.send_event = prox_proc_event;
 325         prox_state->callbacks.capture_sample = prox_capture_sample;
 326         prox_state->callbacks.pdev = pdev;
 327         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX,
 328                                         &prox_state->callbacks);
 329         if (ret < 0) {
 330                 dev_err(&pdev->dev, "callback reg failed\n");
 331                 goto error_iio_unreg;
 332         }
 333
 334         return ret;
 335
 336 error_iio_unreg:
 337         iio_device_unregister(indio_dev);
 338 error_remove_trigger:
 339         hid_sensor_remove_trigger(&prox_state->common_attributes);
 340 error_unreg_buffer_funcs:
 341         iio_triggered_buffer_cleanup(indio_dev);
 342 error_free_dev_mem:
 343         kfree(indio_dev->channels);
 344         return ret;
 345 }
 346
 347 /* Function to deinitialize the processing for usage id */
 348 static int hid_prox_remove(struct platform_device *pdev)
 349 {
 350         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 351         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 352         struct prox_state *prox_state = iio_priv(indio_dev);
 353
 354         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX);
 355         iio_device_unregister(indio_dev);
 356         hid_sensor_remove_trigger(&prox_state->common_attributes);
 357         iio_triggered_buffer_cleanup(indio_dev);
 358         kfree(indio_dev->channels);
 359
 360         return 0;
 361 }
 362
 363 static struct platform_device_id hid_prox_ids[] = {
 364         {
 365                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 366                 .name = "HID-SENSOR-200011",
 367         },
 368         { /* sentinel */ }
 369 };
 370 MODULE_DEVICE_TABLE(platform, hid_prox_ids);
 371
 372 static struct platform_driver hid_prox_platform_driver = {
 373         .id_table = hid_prox_ids,
 374         .driver = {
 375                 .name   = KBUILD_MODNAME,
 376                 .owner  = THIS_MODULE,
 377         },
 378         .probe          = hid_prox_probe,
 379         .remove         = hid_prox_remove,
 380 };
 381 module_platform_driver(hid_prox_platform_driver);
 382
 383 MODULE_DESCRIPTION("HID Sensor Proximity");
 384 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
 385 MODULE_LICENSE("GPL");