drivers/iio/pressure/hid-sensor-press.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2014, 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_PRESSURE,
  18         CHANNEL_SCAN_INDEX_TIMESTAMP,
  19 };
  20
  21 struct press_state {
  22         struct hid_sensor_hub_callbacks callbacks;
  23         struct hid_sensor_common common_attributes;
  24         struct hid_sensor_hub_attribute_info press_attr;
  25         struct {
  26                 u32 press_data;
  27                 aligned_s64 timestamp;
  28         } scan;
  29         int scale_pre_decml;
  30         int scale_post_decml;
  31         int scale_precision;
  32         int value_offset;
  33         s64 timestamp;
  34 };
  35
  36 static const u32 press_sensitivity_addresses[] = {
  37         HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE,
  38         HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE
  39 };
  40
  41 /* Channel definitions */
  42 static const struct iio_chan_spec press_channels[] = {
  43         {
  44                 .type = IIO_PRESSURE,
  45                 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
  46                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
  47                 BIT(IIO_CHAN_INFO_SCALE) |
  48                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
  49                 BIT(IIO_CHAN_INFO_HYSTERESIS),
  50                 .scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
  51         },
  52         IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
  53
  54 };
  55
  56 /* Adjust channel real bits based on report descriptor */
  57 static void press_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 press_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 press_state *press_state = iio_priv(indio_dev);
  74         int report_id = -1;
  75         u32 address;
  76         int ret_type;
  77         s32 min;
  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_PRESSURE:
  85                         report_id = press_state->press_attr.report_id;
  86                         min = press_state->press_attr.logical_minimum;
  87                         address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
  88                         break;
  89                 default:
  90                         report_id = -1;
  91                         break;
  92                 }
  93                 if (report_id >= 0) {
  94                         hid_sensor_power_state(&press_state->common_attributes,
  95                                                 true);
  96                         *val = sensor_hub_input_attr_get_raw_value(
  97                                 press_state->common_attributes.hsdev,
  98                                 HID_USAGE_SENSOR_PRESSURE, address,
  99                                 report_id,
 100                                 SENSOR_HUB_SYNC,
 101                                 min < 0);
 102                         hid_sensor_power_state(&press_state->common_attributes,
 103                                                 false);
 104                 } else {
 105                         *val = 0;
 106                         return -EINVAL;
 107                 }
 108                 ret_type = IIO_VAL_INT;
 109                 break;
 110         case IIO_CHAN_INFO_SCALE:
 111                 *val = press_state->scale_pre_decml;
 112                 *val2 = press_state->scale_post_decml;
 113                 ret_type = press_state->scale_precision;
 114                 break;
 115         case IIO_CHAN_INFO_OFFSET:
 116                 *val = press_state->value_offset;
 117                 ret_type = IIO_VAL_INT;
 118                 break;
 119         case IIO_CHAN_INFO_SAMP_FREQ:
 120                 ret_type = hid_sensor_read_samp_freq_value(
 121                                 &press_state->common_attributes, val, val2);
 122                 break;
 123         case IIO_CHAN_INFO_HYSTERESIS:
 124                 ret_type = hid_sensor_read_raw_hyst_value(
 125                                 &press_state->common_attributes, val, val2);
 126                 break;
 127         default:
 128                 ret_type = -EINVAL;
 129                 break;
 130         }
 131
 132         return ret_type;
 133 }
 134
 135 /* Channel write_raw handler */
 136 static int press_write_raw(struct iio_dev *indio_dev,
 137                                struct iio_chan_spec const *chan,
 138                                int val,
 139                                int val2,
 140                                long mask)
 141 {
 142         struct press_state *press_state = iio_priv(indio_dev);
 143         int ret = 0;
 144
 145         switch (mask) {
 146         case IIO_CHAN_INFO_SAMP_FREQ:
 147                 ret = hid_sensor_write_samp_freq_value(
 148                                 &press_state->common_attributes, val, val2);
 149                 break;
 150         case IIO_CHAN_INFO_HYSTERESIS:
 151                 ret = hid_sensor_write_raw_hyst_value(
 152                                 &press_state->common_attributes, val, val2);
 153                 break;
 154         default:
 155                 ret = -EINVAL;
 156         }
 157
 158         return ret;
 159 }
 160
 161 static const struct iio_info press_info = {
 162         .read_raw = &press_read_raw,
 163         .write_raw = &press_write_raw,
 164 };
 165
 166 /* Callback handler to send event after all samples are received and captured */
 167 static int press_proc_event(struct hid_sensor_hub_device *hsdev,
 168                                 unsigned usage_id,
 169                                 void *priv)
 170 {
 171         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 172         struct press_state *press_state = iio_priv(indio_dev);
 173
 174         dev_dbg(&indio_dev->dev, "press_proc_event\n");
 175         if (atomic_read(&press_state->common_attributes.data_ready)) {
 176                 if (!press_state->timestamp)
 177                         press_state->timestamp = iio_get_time_ns(indio_dev);
 178
 179                 iio_push_to_buffers_with_timestamp(
 180                         indio_dev, &press_state->scan, press_state->timestamp);
 181         }
 182
 183         return 0;
 184 }
 185
 186 /* Capture samples in local storage */
 187 static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
 188                                 unsigned usage_id,
 189                                 size_t raw_len, char *raw_data,
 190                                 void *priv)
 191 {
 192         struct iio_dev *indio_dev = platform_get_drvdata(priv);
 193         struct press_state *press_state = iio_priv(indio_dev);
 194         int ret = -EINVAL;
 195
 196         switch (usage_id) {
 197         case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
 198                 press_state->scan.press_data = *(u32 *)raw_data;
 199                 ret = 0;
 200                 break;
 201         case HID_USAGE_SENSOR_TIME_TIMESTAMP:
 202                 press_state->timestamp = hid_sensor_convert_timestamp(
 203                         &press_state->common_attributes, *(s64 *)raw_data);
 204                 break;
 205         default:
 206                 break;
 207         }
 208
 209         return ret;
 210 }
 211
 212 /* Parse report which is specific to an usage id*/
 213 static int press_parse_report(struct platform_device *pdev,
 214                                 struct hid_sensor_hub_device *hsdev,
 215                                 struct iio_chan_spec *channels,
 216                                 unsigned usage_id,
 217                                 struct press_state *st)
 218 {
 219         int ret;
 220
 221         ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
 222                         usage_id,
 223                         HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
 224                         &st->press_attr);
 225         if (ret < 0)
 226                 return ret;
 227         press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
 228                                         st->press_attr.size);
 229
 230         dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
 231                         st->press_attr.report_id);
 232
 233         st->scale_precision = hid_sensor_format_scale(
 234                                 HID_USAGE_SENSOR_PRESSURE,
 235                                 &st->press_attr,
 236                                 &st->scale_pre_decml, &st->scale_post_decml);
 237
 238         return ret;
 239 }
 240
 241 /* Function to initialize the processing for usage id */
 242 static int hid_press_probe(struct platform_device *pdev)
 243 {
 244         struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
 245         int ret = 0;
 246         static const char *name = "press";
 247         struct iio_dev *indio_dev;
 248         struct press_state *press_state;
 249
 250         indio_dev = devm_iio_device_alloc(&pdev->dev,
 251                                 sizeof(struct press_state));
 252         if (!indio_dev)
 253                 return -ENOMEM;
 254         platform_set_drvdata(pdev, indio_dev);
 255
 256         press_state = iio_priv(indio_dev);
 257         press_state->common_attributes.hsdev = hsdev;
 258         press_state->common_attributes.pdev = pdev;
 259
 260         ret = hid_sensor_parse_common_attributes(hsdev,
 261                                         HID_USAGE_SENSOR_PRESSURE,
 262                                         &press_state->common_attributes,
 263                                         press_sensitivity_addresses,
 264                                         ARRAY_SIZE(press_sensitivity_addresses));
 265         if (ret) {
 266                 dev_err(&pdev->dev, "failed to setup common attributes\n");
 267                 return ret;
 268         }
 269
 270         indio_dev->channels = devm_kmemdup(&pdev->dev, press_channels,
 271                                            sizeof(press_channels), GFP_KERNEL);
 272         if (!indio_dev->channels) {
 273                 dev_err(&pdev->dev, "failed to duplicate channels\n");
 274                 return -ENOMEM;
 275         }
 276
 277         ret = press_parse_report(pdev, hsdev,
 278                                  (struct iio_chan_spec *)indio_dev->channels,
 279                                  HID_USAGE_SENSOR_PRESSURE, press_state);
 280         if (ret) {
 281                 dev_err(&pdev->dev, "failed to setup attributes\n");
 282                 return ret;
 283         }
 284
 285         indio_dev->num_channels =
 286                                 ARRAY_SIZE(press_channels);
 287         indio_dev->info = &press_info;
 288         indio_dev->name = name;
 289         indio_dev->modes = INDIO_DIRECT_MODE;
 290
 291         atomic_set(&press_state->common_attributes.data_ready, 0);
 292
 293         ret = hid_sensor_setup_trigger(indio_dev, name,
 294                                 &press_state->common_attributes);
 295         if (ret) {
 296                 dev_err(&pdev->dev, "trigger setup failed\n");
 297                 return ret;
 298         }
 299
 300         ret = iio_device_register(indio_dev);
 301         if (ret) {
 302                 dev_err(&pdev->dev, "device register failed\n");
 303                 goto error_remove_trigger;
 304         }
 305
 306         press_state->callbacks.send_event = press_proc_event;
 307         press_state->callbacks.capture_sample = press_capture_sample;
 308         press_state->callbacks.pdev = pdev;
 309         ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
 310                                         &press_state->callbacks);
 311         if (ret < 0) {
 312                 dev_err(&pdev->dev, "callback reg failed\n");
 313                 goto error_iio_unreg;
 314         }
 315
 316         return ret;
 317
 318 error_iio_unreg:
 319         iio_device_unregister(indio_dev);
 320 error_remove_trigger:
 321         hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes);
 322         return ret;
 323 }
 324
 325 /* Function to deinitialize the processing for usage id */
 326 static void hid_press_remove(struct platform_device *pdev)
 327 {
 328         struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
 329         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 330         struct press_state *press_state = iio_priv(indio_dev);
 331
 332         sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
 333         iio_device_unregister(indio_dev);
 334         hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes);
 335 }
 336
 337 static const struct platform_device_id hid_press_ids[] = {
 338         {
 339                 /* Format: HID-SENSOR-usage_id_in_hex_lowercase */
 340                 .name = "HID-SENSOR-200031",
 341         },
 342         { /* sentinel */ }
 343 };
 344 MODULE_DEVICE_TABLE(platform, hid_press_ids);
 345
 346 static struct platform_driver hid_press_platform_driver = {
 347         .id_table = hid_press_ids,
 348         .driver = {
 349                 .name   = KBUILD_MODNAME,
 350                 .pm     = &hid_sensor_pm_ops,
 351         },
 352         .probe          = hid_press_probe,
 353         .remove         = hid_press_remove,
 354 };
 355 module_platform_driver(hid_press_platform_driver);
 356
 357 MODULE_DESCRIPTION("HID Sensor Pressure");
 358 MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
 359 MODULE_LICENSE("GPL");
 360 MODULE_IMPORT_NS("IIO_HID");