drivers/iio/light/hid-sensor-als.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2012, Intel Corporation.
   5  */
   6 #include <linux/device.h>
   7 #include <linux/platform_device.h>
   8 #include <linux/module.h>
   9 #include <linux/mod_devicetable.h>
  10 #include <linux/slab.h>
  11 #include <linux/hid-sensor-hub.h>
  12 #include <linux/iio/iio.h>
  13 #include <linux/iio/buffer.h>
  14 #include "../common/hid-sensors/hid-sensor-trigger.h"
  15
  16 enum {
  17         CHANNEL_SCAN_INDEX_INTENSITY = 0,
  18         CHANNEL_SCAN_INDEX_ILLUM = 1,
  19         CHANNEL_SCAN_INDEX_MAX
  20 };
  21
  22 #define CHANNEL_SCAN_INDEX_TIMESTAMP CHANNEL_SCAN_INDEX_MAX
  23
  24 struct als_state {
  25         struct hid_sensor_hub_callbacks callbacks;
  26         struct hid_sensor_common common_attributes;
  27         struct hid_sensor_hub_attribute_info als[CHANNEL_SCAN_INDEX_MAX];
  28         struct {
  29                 u32 illum[CHANNEL_SCAN_INDEX_MAX];
  30                 u64 timestamp __aligned(8);
  31         } scan;
  32         int scale_pre_decml;
  33         int scale_post_decml;
  34         int scale_precision;
  35         int value_offset;
  36         s64 timestamp;
  37 };
  38
  39 static const u32 als_sensitivity_addresses[] = {
  40         HID_USAGE_SENSOR_DATA_LIGHT,
  41         HID_USAGE_SENSOR_LIGHT_ILLUM,
  42 };
  43
  44 /* Channel definitions */
  45 static const struct iio_chan_spec als_channels[] = {
  46         {
  47                 .type = IIO_INTENSITY,
  48                 .modified = 1,
  49                 .channel2 = IIO_MOD_LIGHT_BOTH,
  50                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  51                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  52                 BIT(IIO_CHAN_INFO_SCALE) |
  53                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  54                 BIT(IIO_CHAN_INFO_HYSTERESIS) |
  55                 BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
  56                 .scan_index = CHANNEL_SCAN_INDEX_INTENSITY,
  57         },
  58         {
  59                 .type = IIO_LIGHT,
  60                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  61                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  62                 BIT(IIO_CHAN_INFO_SCALE) |
  63                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  64                 BIT(IIO_CHAN_INFO_HYSTERESIS) |
  65                 BIT(IIO_CHAN_INFO_HYSTERESIS_RELATIVE),
  66                 .scan_index = CHANNEL_SCAN_INDEX_ILLUM,
  67         },
  68         IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
  69 };
  70
  71 /* Adjust channel real bits based on report descriptor */
  72 static void als_adjust_channel_bit_mask(struct iio_chan_spec *channels,
  73                                         int channel, int size)
  74 {
  75         channels[channel].scan_type.sign = 's';
  76         /* Real storage bits will change based on the report desc. */
  77         channels[channel].scan_type.realbits = size * 8;
  78         /* Maximum size of a sample to capture is u32 */
  79         channels[channel].scan_type.storagebits = sizeof(u32) * 8;
  80 }
  81
  82 /* Channel read_raw handler */
  83 static int als_read_raw(struct iio_dev *indio_dev,
  84                               struct iio_chan_spec const *chan,
  85                               int *val, int *val2,
  86                               long mask)
  87 {
  88         struct als_state *als_state = iio_priv(indio_dev);
  89         struct hid_sensor_hub_device *hsdev = als_state->common_attributes.hsdev;
  90         int report_id = -1;
  91         u32 address;
  92         int ret_type;
  93         s32 min;
  94
  95         *val = 0;
  96         *val2 = 0;
  97         switch (mask) {
  98         case IIO_CHAN_INFO_RAW:
  99                 switch (chan->scan_index) {
 100                 case  CHANNEL_SCAN_INDEX_INTENSITY:
 101                 case  CHANNEL_SCAN_INDEX_ILLUM:
 102                         report_id = als_state->als[chan->scan_index].report_id;
 103                         min = als_state->als[chan->scan_index].logical_minimum;
 104                         address = HID_USAGE_SENSOR_LIGHT_ILLUM;
 105                         break;
 106                 default:
 107                         report_id = -1;
 108                         break;
 109                 }
 110                 if (report_id >= 0) {
 111                         hid_sensor_power_state(&als_state->common_attributes,
 112                                                 true);
 113                         *val = sensor_hub_input_attr_get_raw_value(
 114                                         hsdev, hsdev->usage, address, report_id,
 115                                         SENSOR_HUB_SYNC, min < 0);
 116                         hid_sensor_power_state(&als_state->common_attributes,
 117                                                 false);
 118                 } else {
 119                         *val = 0;
 120                         return -EINVAL;
 121                 }
 122                 ret_type = IIO_VAL_INT;
 123                 break;
 124         case IIO_CHAN_INFO_SCALE:
 125                 *val = als_state->scale_pre_decml;
 126                 *val2 = als_state->scale_post_decml;
 127                 ret_type = als_state->scale_precision;
 128                 break;
 129         case IIO_CHAN_INFO_OFFSET:
 130                 *val = als_state->value_offset;
 131                 ret_type = IIO_VAL_INT;
 132                 break;
 133         case IIO_CHAN_INFO_SAMP_FREQ:
 134                 ret_type = hid_sensor_read_samp_freq_value(
 135                                 &als_state->common_attributes, val, val2);
 136                 break;
 137         case IIO_CHAN_INFO_HYSTERESIS:
 138                 ret_type = hid_sensor_read_raw_hyst_value(
 139                                 &als_state->common_attributes, val, val2);
 140                 break;
 141         case IIO_CHAN_INFO_HYSTERESIS_RELATIVE:
 142                 ret_type = hid_sensor_read_raw_hyst_rel_value(
 143                                 &als_state->common_attributes, val, val2);
 144                 break;
 145         default:
 146                 ret_type = -EINVAL;
 147                 break;
 148         }
 149
 150         return ret_type;
 151 }
 152
 153 /* Channel write_raw handler */
 154 static int als_write_raw(struct iio_dev *indio_dev,
 155                                struct iio_chan_spec const *chan,
 156                                int val,
 157                                int val2,
 158                                long mask)
 159 {
 160         struct als_state *als_state = iio_priv(indio_dev);
 161         int ret = 0;
 162
 163         switch (mask) {
 164         case IIO_CHAN_INFO_SAMP_FREQ:
 165                 ret = hid_sensor_write_samp_freq_value(
 166                                 &als_state->common_attributes, val, val2);
 167                 break;
 168         case IIO_CHAN_INFO_HYSTERESIS:
 169                 ret = hid_sensor_write_raw_hyst_value(
 170                                 &als_state->common_attributes, val, val2);
 171                 break;
 172         case IIO_CHAN_INFO_HYSTERESIS_RELATIVE:
 173                 ret = hid_sensor_write_raw_hyst_rel_value(
 174                                 &als_state->common_attributes, val, val2);
 175                 break;
 176         default:
 177                 ret = -EINVAL;
 178         }
 179
 180         return ret;
 181 }
 182
 183 static const struct iio_info als_info = {
 184         .read_raw = &als_read_raw,
 185         .write_raw = &als_write_raw,
 186 };
 187
 188 /* Callback handler to send event after all samples are received and captured */
 189 static int als_proc_event(struct hid_sensor_hub_device *hsdev,
 190                                 unsigned usage_id,
 191                                 void *priv)
 192 {
 193         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 194         struct als_state *als_state = iio_priv(indio_dev);
 195
 196         dev_dbg(&indio_dev->dev, "als_proc_event\n");
 197         if (atomic_read(&als_state->common_attributes.data_ready)) {
 198                 if (!als_state->timestamp)
 199                         als_state->timestamp = iio_get_time_ns(indio_dev);
 200
 201                 iio_push_to_buffers_with_timestamp(indio_dev, &als_state->scan,
 202                                                    als_state->timestamp);
 203                 als_state->timestamp = 0;
 204         }
 205
 206         return 0;
 207 }
 208
 209 /* Capture samples in local storage */
 210 static int als_capture_sample(struct hid_sensor_hub_device *hsdev,
 211                                 unsigned usage_id,
 212                                 size_t raw_len, char *raw_data,
 213                                 void *priv)
 214 {
 215         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 216         struct als_state *als_state = iio_priv(indio_dev);
 217         int ret = -EINVAL;
 218         u32 sample_data = *(u32 *)raw_data;
 219
 220         switch (usage_id) {
 221         case HID_USAGE_SENSOR_LIGHT_ILLUM:
 222                 als_state->scan.illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
 223                 als_state->scan.illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
 224                 ret = 0;
 225                 break;
 226         case HID_USAGE_SENSOR_TIME_TIMESTAMP:
 227                 als_state->timestamp = hid_sensor_convert_timestamp(&als_state->common_attributes,
 228                                                                     *(s64 *)raw_data);
 229                 ret = 0;
 230                 break;
 231         default:
 232                 break;
 233         }
 234
 235         return ret;
 236 }
 237
 238 /* Parse report which is specific to an usage id*/
 239 static int als_parse_report(struct platform_device *pdev,
 240                                 struct hid_sensor_hub_device *hsdev,
 241                                 struct iio_chan_spec *channels,
 242                                 unsigned usage_id,
 243                                 struct als_state *st)
 244 {
 245         int ret;
 246         int i;
 247
 248         for (i = 0; i <= CHANNEL_SCAN_INDEX_ILLUM; ++i) {
 249                 ret = sensor_hub_input_get_attribute_info(hsdev,
 250                                                 HID_INPUT_REPORT,
 251                                                 usage_id,
 252                                                 HID_USAGE_SENSOR_LIGHT_ILLUM,
 253                                                 &st->als[i]);
 254                 if (ret < 0)
 255                         return ret;
 256                 als_adjust_channel_bit_mask(channels, i, st->als[i].size);
 257
 258                 dev_dbg(&pdev->dev, "als %x:%x\n", st->als[i].index,
 259                         st->als[i].report_id);
 260         }
 261
 262         st->scale_precision = hid_sensor_format_scale(usage_id,
 263                                 &st->als[CHANNEL_SCAN_INDEX_INTENSITY],
 264                                 &st->scale_pre_decml, &st->scale_post_decml);
 265
 266         return ret;
 267 }
 268
 269 /* Function to initialize the processing for usage id */
 270 static int hid_als_probe(struct platform_device *pdev)
 271 {
 272         int ret = 0;
 273         static const char *name = "als";
 274         struct iio_dev *indio_dev;
 275         struct als_state *als_state;
 276         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 277
 278         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
 279         if (!indio_dev)
 280                 return -ENOMEM;
 281         platform_set_drvdata(pdev, indio_dev);
 282
 283         als_state = iio_priv(indio_dev);
 284         als_state->common_attributes.hsdev = hsdev;
 285         als_state->common_attributes.pdev = pdev;
 286
 287         ret = hid_sensor_parse_common_attributes(hsdev,
 288                                         hsdev->usage,
 289                                         &als_state->common_attributes,
 290                                         als_sensitivity_addresses,
 291                                         ARRAY_SIZE(als_sensitivity_addresses));
 292         if (ret) {
 293                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 294                 return ret;
 295         }
 296
 297         indio_dev->channels = devm_kmemdup(&pdev->dev, als_channels,
 298                                            sizeof(als_channels), GFP_KERNEL);
 299         if (!indio_dev->channels) {
 300                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 301                 return -ENOMEM;
 302         }
 303
 304         ret = als_parse_report(pdev, hsdev,
 305                                (struct iio_chan_spec *)indio_dev->channels,
 306                                hsdev->usage,
 307                                als_state);
 308         if (ret) {
 309                 dev_err(&pdev->dev, "failed to setup attributes\n");
 310                 return ret;
 311         }
 312
 313         indio_dev->num_channels =
 314                                 ARRAY_SIZE(als_channels);
 315         indio_dev->info = &als_info;
 316         indio_dev->name = name;
 317         indio_dev->modes = INDIO_DIRECT_MODE;
 318
 319         atomic_set(&als_state->common_attributes.data_ready, 0);
 320
 321         ret = hid_sensor_setup_trigger(indio_dev, name,
 322                                 &als_state->common_attributes);
 323         if (ret < 0) {
 324                 dev_err(&pdev->dev, "trigger setup failed\n");
 325                 return ret;
 326         }
 327
 328         ret = iio_device_register(indio_dev);
 329         if (ret) {
 330                 dev_err(&pdev->dev, "device register failed\n");
 331                 goto error_remove_trigger;
 332         }
 333
 334         als_state->callbacks.send_event = als_proc_event;
 335         als_state->callbacks.capture_sample = als_capture_sample;
 336         als_state->callbacks.pdev = pdev;
 337         ret = sensor_hub_register_callback(hsdev, hsdev->usage, &als_state->callbacks);
 338         if (ret < 0) {
 339                 dev_err(&pdev->dev, "callback reg failed\n");
 340                 goto error_iio_unreg;
 341         }
 342
 343         return ret;
 344
 345 error_iio_unreg:
 346         iio_device_unregister(indio_dev);
 347 error_remove_trigger:
 348         hid_sensor_remove_trigger(indio_dev, &als_state->common_attributes);
 349         return ret;
 350 }
 351
 352 /* Function to deinitialize the processing for usage id */
 353 static void hid_als_remove(struct platform_device *pdev)
 354 {
 355         struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 356         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 357         struct als_state *als_state = iio_priv(indio_dev);
 358
 359         sensor_hub_remove_callback(hsdev, hsdev->usage);
 360         iio_device_unregister(indio_dev);
 361         hid_sensor_remove_trigger(indio_dev, &als_state->common_attributes);
 362 }
 363
 364 static const struct platform_device_id hid_als_ids[] = {
 365         {
 366                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 367                 .name = "HID-SENSOR-200041",
 368         },
 369         {
 370                 /* Format: HID-SENSOR-custom_sensor_tag-usage_id_in_hex_lowercase */
 371                 .name = "HID-SENSOR-LISS-0041",
 372         },
 373         { /* sentinel */ }
 374 };
 375 MODULE_DEVICE_TABLE(platform, hid_als_ids);
 376
 377 static struct platform_driver hid_als_platform_driver = {
 378         .id_table = hid_als_ids,
 379         .driver = {
 380                 .name   = KBUILD_MODNAME,
 381                 .pm     = &hid_sensor_pm_ops,
 382         },
 383         .probe          = hid_als_probe,
 384         .remove_new     = hid_als_remove,
 385 };
 386 module_platform_driver(hid_als_platform_driver);
 387
 388 MODULE_DESCRIPTION("HID Sensor ALS");
 389 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 390 MODULE_LICENSE("GPL");
 391 MODULE_IMPORT_NS(IIO_HID);