316 lines
8.8 KiB
C
316 lines
8.8 KiB
C
/*
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* HID Sensors Driver
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* Copyright (c) 2017, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program.
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*/
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#include <linux/device.h>
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#include <linux/hid-sensor-hub.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include "hid-sensor-trigger.h"
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struct hid_humidity_state {
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struct hid_sensor_common common_attributes;
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struct hid_sensor_hub_attribute_info humidity_attr;
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s32 humidity_data;
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int scale_pre_decml;
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int scale_post_decml;
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int scale_precision;
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int value_offset;
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};
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/* Channel definitions */
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static const struct iio_chan_spec humidity_channels[] = {
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{
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.type = IIO_HUMIDITYRELATIVE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_HYSTERESIS),
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},
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IIO_CHAN_SOFT_TIMESTAMP(1)
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};
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/* Adjust channel real bits based on report descriptor */
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static void humidity_adjust_channel_bit_mask(struct iio_chan_spec *channels,
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int channel, int size)
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{
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channels[channel].scan_type.sign = 's';
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/* Real storage bits will change based on the report desc. */
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channels[channel].scan_type.realbits = size * 8;
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/* Maximum size of a sample to capture is s32 */
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channels[channel].scan_type.storagebits = sizeof(s32) * 8;
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}
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static int humidity_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct hid_humidity_state *humid_st = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (chan->type != IIO_HUMIDITYRELATIVE)
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return -EINVAL;
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hid_sensor_power_state(&humid_st->common_attributes, true);
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*val = sensor_hub_input_attr_get_raw_value(
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humid_st->common_attributes.hsdev,
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HID_USAGE_SENSOR_HUMIDITY,
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HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
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humid_st->humidity_attr.report_id,
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SENSOR_HUB_SYNC);
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hid_sensor_power_state(&humid_st->common_attributes, false);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = humid_st->scale_pre_decml;
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*val2 = humid_st->scale_post_decml;
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return humid_st->scale_precision;
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case IIO_CHAN_INFO_OFFSET:
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*val = humid_st->value_offset;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SAMP_FREQ:
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return hid_sensor_read_samp_freq_value(
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&humid_st->common_attributes, val, val2);
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case IIO_CHAN_INFO_HYSTERESIS:
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return hid_sensor_read_raw_hyst_value(
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&humid_st->common_attributes, val, val2);
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default:
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return -EINVAL;
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}
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}
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static int humidity_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct hid_humidity_state *humid_st = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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return hid_sensor_write_samp_freq_value(
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&humid_st->common_attributes, val, val2);
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case IIO_CHAN_INFO_HYSTERESIS:
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return hid_sensor_write_raw_hyst_value(
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&humid_st->common_attributes, val, val2);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info humidity_info = {
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.driver_module = THIS_MODULE,
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.read_raw = &humidity_read_raw,
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.write_raw = &humidity_write_raw,
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};
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/* Callback handler to send event after all samples are received and captured */
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static int humidity_proc_event(struct hid_sensor_hub_device *hsdev,
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unsigned int usage_id, void *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct hid_humidity_state *humid_st = iio_priv(indio_dev);
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if (atomic_read(&humid_st->common_attributes.data_ready))
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iio_push_to_buffers_with_timestamp(indio_dev,
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&humid_st->humidity_data,
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iio_get_time_ns(indio_dev));
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return 0;
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}
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/* Capture samples in local storage */
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static int humidity_capture_sample(struct hid_sensor_hub_device *hsdev,
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unsigned int usage_id, size_t raw_len,
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char *raw_data, void *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct hid_humidity_state *humid_st = iio_priv(indio_dev);
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switch (usage_id) {
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case HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY:
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humid_st->humidity_data = *(s32 *)raw_data;
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return 0;
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default:
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return -EINVAL;
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}
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}
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/* Parse report which is specific to an usage id */
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static int humidity_parse_report(struct platform_device *pdev,
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struct hid_sensor_hub_device *hsdev,
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struct iio_chan_spec *channels,
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unsigned int usage_id,
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struct hid_humidity_state *st)
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{
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int ret;
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ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
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usage_id,
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HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
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&st->humidity_attr);
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if (ret < 0)
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return ret;
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humidity_adjust_channel_bit_mask(channels, 0, st->humidity_attr.size);
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st->scale_precision = hid_sensor_format_scale(
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HID_USAGE_SENSOR_HUMIDITY,
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&st->humidity_attr,
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&st->scale_pre_decml,
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&st->scale_post_decml);
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/* Set Sensitivity field ids, when there is no individual modifier */
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if (st->common_attributes.sensitivity.index < 0)
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sensor_hub_input_get_attribute_info(hsdev,
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HID_FEATURE_REPORT, usage_id,
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HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
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HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY,
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&st->common_attributes.sensitivity);
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return ret;
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}
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static struct hid_sensor_hub_callbacks humidity_callbacks = {
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.send_event = &humidity_proc_event,
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.capture_sample = &humidity_capture_sample,
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};
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/* Function to initialize the processing for usage id */
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static int hid_humidity_probe(struct platform_device *pdev)
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{
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static const char *name = "humidity";
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struct iio_dev *indio_dev;
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struct hid_humidity_state *humid_st;
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struct iio_chan_spec *humid_chans;
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struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
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int ret;
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*humid_st));
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if (!indio_dev)
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return -ENOMEM;
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humid_st = iio_priv(indio_dev);
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humid_st->common_attributes.hsdev = hsdev;
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humid_st->common_attributes.pdev = pdev;
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ret = hid_sensor_parse_common_attributes(hsdev,
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HID_USAGE_SENSOR_HUMIDITY,
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&humid_st->common_attributes);
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if (ret)
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return ret;
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humid_chans = devm_kmemdup(&indio_dev->dev, humidity_channels,
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sizeof(humidity_channels), GFP_KERNEL);
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if (!humid_chans)
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return -ENOMEM;
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ret = humidity_parse_report(pdev, hsdev, humid_chans,
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HID_USAGE_SENSOR_HUMIDITY, humid_st);
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if (ret)
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return ret;
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indio_dev->channels = humid_chans;
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indio_dev->num_channels = ARRAY_SIZE(humidity_channels);
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indio_dev->dev.parent = &pdev->dev;
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indio_dev->info = &humidity_info;
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indio_dev->name = name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = devm_iio_triggered_buffer_setup(&pdev->dev, indio_dev,
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&iio_pollfunc_store_time, NULL, NULL);
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if (ret)
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return ret;
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atomic_set(&humid_st->common_attributes.data_ready, 0);
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ret = hid_sensor_setup_trigger(indio_dev, name,
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&humid_st->common_attributes);
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if (ret)
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return ret;
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platform_set_drvdata(pdev, indio_dev);
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humidity_callbacks.pdev = pdev;
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ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY,
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&humidity_callbacks);
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if (ret)
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goto error_remove_trigger;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto error_remove_callback;
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return ret;
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error_remove_callback:
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sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
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error_remove_trigger:
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hid_sensor_remove_trigger(&humid_st->common_attributes);
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return ret;
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}
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/* Function to deinitialize the processing for usage id */
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static int hid_humidity_remove(struct platform_device *pdev)
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{
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struct hid_sensor_hub_device *hsdev = dev_get_platdata(&pdev->dev);
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct hid_humidity_state *humid_st = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_HUMIDITY);
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hid_sensor_remove_trigger(&humid_st->common_attributes);
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return 0;
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}
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static const struct platform_device_id hid_humidity_ids[] = {
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{
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/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
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.name = "HID-SENSOR-200032",
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, hid_humidity_ids);
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static struct platform_driver hid_humidity_platform_driver = {
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.id_table = hid_humidity_ids,
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.driver = {
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.name = KBUILD_MODNAME,
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.pm = &hid_sensor_pm_ops,
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},
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.probe = hid_humidity_probe,
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.remove = hid_humidity_remove,
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};
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module_platform_driver(hid_humidity_platform_driver);
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MODULE_DESCRIPTION("HID Environmental humidity sensor");
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MODULE_AUTHOR("Song Hongyan <hongyan.song@intel.com>");
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MODULE_LICENSE("GPL v2");
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