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