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3eaf1b6315
Add support for dht20 temperature and humidity sensor from Aosong. Modify aht10 driver to handle different init command for dht20 sensor by adding init_cmd entry in the driver data. dht20 sensor is compatible with aht10 hwmon driver with this change. Tested on TI am62x SK board with dht20 sensor connected at i2c-2 port. Signed-off-by: Akhilesh Patil <akhilesh@ee.iitb.ac.in> Link: https://lore.kernel.org/r/2025112-94320-906858@bhairav-test.ee.iitb.ac.in Signed-off-by: Guenter Roeck <linux@roeck-us.net>
65 lines
1.6 KiB
ReStructuredText
65 lines
1.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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Kernel driver aht10
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=====================
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Supported chips:
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* Aosong AHT10/AHT20
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Prefix: 'aht10'
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Addresses scanned: None
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Datasheet(AHT10):
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Chinese: http://www.aosong.com/userfiles/files/media/AHT10%E4%BA%A7%E5%93%81%E6%89%8B%E5%86%8C%20A3%2020201210.pdf
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English: https://server4.eca.ir/eshop/AHT10/Aosong_AHT10_en_draft_0c.pdf
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Datasheet(AHT20):
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English: http://www.aosong.com/userfiles/files/media/Data%20Sheet%20AHT20.pdf
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* Aosong DHT20
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Prefix: 'dht20'
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Addresses scanned: None
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Datasheet: https://www.digikey.co.nz/en/htmldatasheets/production/9184855/0/0/1/101020932
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Author: Johannes Cornelis Draaijer <jcdra1@gmail.com>
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Description
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-----------
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The AHT10/AHT20 is a Temperature and Humidity sensor
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The address of this i2c device may only be 0x38
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Special Features
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----------------
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AHT20, DHT20 has additional CRC8 support which is sent as the last byte of the sensor
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values.
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Usage Notes
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-----------
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This driver does not probe for AHT10/ATH20 devices, as there is no reliable
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way to determine if an i2c chip is or isn't an AHT10/AHT20. The device has
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to be instantiated explicitly with the address 0x38. See
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Documentation/i2c/instantiating-devices.rst for details.
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Sysfs entries
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-------------
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=============== ============================================
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temp1_input Measured temperature in millidegrees Celsius
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humidity1_input Measured humidity in %H
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update_interval The minimum interval for polling the sensor,
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in milliseconds. Writable. Must be at
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least 2000.
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=============== ============================================
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