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299 lines
8.1 KiB
299 lines
8.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* HID Sensors Driver |
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* Copyright (c) 2017, Intel Corporation. |
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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/module.h> |
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#include <linux/mod_devicetable.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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struct { |
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s32 humidity_data; |
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u64 timestamp __aligned(8); |
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} scan; |
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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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static const u32 humidity_sensitivity_addresses[] = { |
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HID_USAGE_SENSOR_ATMOSPHERIC_HUMIDITY, |
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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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humid_st->humidity_attr.logical_minimum < 0); |
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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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.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, &humid_st->scan, |
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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->scan.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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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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humidity_sensitivity_addresses, |
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ARRAY_SIZE(humidity_sensitivity_addresses)); |
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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->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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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(indio_dev, &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(indio_dev, &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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_IMPORT_NS(IIO_HID);
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