linux/drivers/iio/humidity/hid-sensor-humidity.c
Thomas Gleixner f6cc69f1f3 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 309
Based on 2 normalized pattern(s):

  it and or modify it under the terms of the gnu general public
  license version 2 as published by the free software foundation this
  program is distributed in the hope it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  version 2 as published by the free software foundation this program
  is distributed in the hope it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 11 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000434.249870634@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:04 +02:00

305 lines
8.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* HID Sensors Driver
* Copyright (c) 2017, Intel Corporation.
*/
#include <linux/device.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include "hid-sensor-trigger.h"
struct hid_humidity_state {
struct hid_sensor_common common_attributes;
struct hid_sensor_hub_attribute_info humidity_attr;
s32 humidity_data;
int scale_pre_decml;
int scale_post_decml;
int scale_precision;
int value_offset;
};
/* Channel definitions */
static const struct iio_chan_spec humidity_channels[] = {
{
.type = IIO_HUMIDITYRELATIVE,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_HYSTERESIS),
},
IIO_CHAN_SOFT_TIMESTAMP(1)
};
/* Adjust channel real bits based on report descriptor */
static void humidity_adjust_channel_bit_mask(struct iio_chan_spec *channels,
int channel, int size)
{
channels[channel].scan_type.sign = 's';
/* Real storage bits will change based on the report desc. */
channels[channel].scan_type.realbits = size * 8;
/* Maximum size of a sample to capture is s32 */
channels[channel].scan_type.storagebits = sizeof(s32) * 8;
}
static int humidity_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct hid_humidity_state *humid_st = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (chan->type != IIO_HUMIDITYRELATIVE)
return -EINVAL;
hid_sensor_power_state(&humid_st->common_attributes, true);
*val = sensor_hub_input_attr_get_raw_value(
humid_st->common_attributes.hsdev,
HID_USAGE_SENSOR_HUMIDITY,
HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
humid_st->humidity_attr.report_id,
SENSOR_HUB_SYNC,
humid_st->humidity_attr.logical_minimum < 0);
hid_sensor_power_state(&humid_st->common_attributes, false);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = humid_st->scale_pre_decml;
*val2 = humid_st->scale_post_decml;
return humid_st->scale_precision;
case IIO_CHAN_INFO_OFFSET:
*val = humid_st->value_offset;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SAMP_FREQ:
return hid_sensor_read_samp_freq_value(
&humid_st->common_attributes, val, val2);
case IIO_CHAN_INFO_HYSTERESIS:
return hid_sensor_read_raw_hyst_value(
&humid_st->common_attributes, val, val2);
default:
return -EINVAL;
}
}
static int humidity_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct hid_humidity_state *humid_st = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
return hid_sensor_write_samp_freq_value(
&humid_st->common_attributes, val, val2);
case IIO_CHAN_INFO_HYSTERESIS:
return hid_sensor_write_raw_hyst_value(
&humid_st->common_attributes, val, val2);
default:
return -EINVAL;
}
}
static const struct iio_info humidity_info = {
.read_raw = &humidity_read_raw,
.write_raw = &humidity_write_raw,
};
/* Callback handler to send event after all samples are received and captured */
static int humidity_proc_event(struct hid_sensor_hub_device *hsdev,
unsigned int usage_id, void *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct hid_humidity_state *humid_st = iio_priv(indio_dev);
if (atomic_read(&humid_st->common_attributes.data_ready))
iio_push_to_buffers_with_timestamp(indio_dev,
&humid_st->humidity_data,
iio_get_time_ns(indio_dev));
return 0;
}
/* Capture samples in local storage */
static int humidity_capture_sample(struct hid_sensor_hub_device *hsdev,
unsigned int usage_id, size_t raw_len,
char *raw_data, void *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct hid_humidity_state *humid_st = iio_priv(indio_dev);
switch (usage_id) {
case HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY:
humid_st->humidity_data = *(s32 *)raw_data;
return 0;
default:
return -EINVAL;
}
}
/* Parse report which is specific to an usage id */
static int humidity_parse_report(struct platform_device *pdev,
struct hid_sensor_hub_device *hsdev,
struct iio_chan_spec *channels,
unsigned int usage_id,
struct hid_humidity_state *st)
{
int ret;
ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
usage_id,
HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
&st->humidity_attr);
if (ret < 0)
return ret;
humidity_adjust_channel_bit_mask(channels, 0, st->humidity_attr.size);
st->scale_precision = hid_sensor_format_scale(
HID_USAGE_SENSOR_HUMIDITY,
&st->humidity_attr,
&st->scale_pre_decml,
&st->scale_post_decml);
/* Set Sensitivity field ids, when there is no individual modifier */
if (st->common_attributes.sensitivity.index < 0)
sensor_hub_input_get_attribute_info(hsdev,
HID_FEATURE_REPORT, usage_id,
HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
&st->common_attributes.sensitivity);
return ret;
}
static struct hid_sensor_hub_callbacks humidity_callbacks = {
.send_event = &humidity_proc_event,
.capture_sample = &humidity_capture_sample,
};
/* Function to initialize the processing for usage id */
static int hid_humidity_probe(struct platform_device *pdev)
{
static const char *name = "humidity";
struct iio_dev *indio_dev;
struct hid_humidity_state *humid_st;
struct iio_chan_spec *humid_chans;
struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
int ret;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*humid_st));
if (!indio_dev)
return -ENOMEM;
humid_st = iio_priv(indio_dev);
humid_st->common_attributes.hsdev = hsdev;
humid_st->common_attributes.pdev = pdev;
ret = hid_sensor_parse_common_attributes(hsdev,
HID_USAGE_SENSOR_HUMIDITY,
&humid_st->common_attributes);
if (ret)
return ret;
humid_chans = devm_kmemdup(&indio_dev->dev, humidity_channels,
sizeof(humidity_channels), GFP_KERNEL);
if (!humid_chans)
return -ENOMEM;
ret = humidity_parse_report(pdev, hsdev, humid_chans,
HID_USAGE_SENSOR_HUMIDITY, humid_st);
if (ret)
return ret;
indio_dev->channels = humid_chans;
indio_dev->num_channels = ARRAY_SIZE(humidity_channels);
indio_dev->dev.parent = &pdev->dev;
indio_dev->info = &humidity_info;
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
&iio_pollfunc_store_time, NULL, NULL);
if (ret)
return ret;
atomic_set(&humid_st->common_attributes.data_ready, 0);
ret = hid_sensor_setup_trigger(indio_dev, name,
&humid_st->common_attributes);
if (ret)
return ret;
platform_set_drvdata(pdev, indio_dev);
humidity_callbacks.pdev = pdev;
ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY,
&humidity_callbacks);
if (ret)
goto error_remove_trigger;
ret = iio_device_register(indio_dev);
if (ret)
goto error_remove_callback;
return ret;
error_remove_callback:
sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
error_remove_trigger:
hid_sensor_remove_trigger(&humid_st->common_attributes);
return ret;
}
/* Function to deinitialize the processing for usage id */
static int hid_humidity_remove(struct platform_device *pdev)
{
struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct hid_humidity_state *humid_st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
hid_sensor_remove_trigger(&humid_st->common_attributes);
return 0;
}
static const struct platform_device_id hid_humidity_ids[] = {
{
/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
.name = "HID-SENSOR-200032",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_humidity_ids);
static struct platform_driver hid_humidity_platform_driver = {
.id_table = hid_humidity_ids,
.driver = {
.name = KBUILD_MODNAME,
.pm = &hid_sensor_pm_ops,
},
.probe = hid_humidity_probe,
.remove = hid_humidity_remove,
};
module_platform_driver(hid_humidity_platform_driver);
MODULE_DESCRIPTION("HID Environmental humidity sensor");
MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");
MODULE_LICENSE("GPL v2");