/* * HID Sensors Driver * Copyright (c) 2017, Intel Corporation. * * 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. */ #include #include #include #include #include #include #include #include #include "hid-sensor-trigger.h" struct hid_humidity_state { struct hid_sensor_common common_attributes; struct hid_sensor_hub_attribute_info humidity_attr; struct { s32 humidity_data; u64 timestamp __aligned(8); } scan; 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 = { .driver_module = THIS_MODULE, .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->scan, 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->scan.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 "); MODULE_LICENSE("GPL v2");