Analog Devices AD7150 and AD7746 capacitance-to-digital converters
A small family of I2C capacitance-to-digital converter chips from Analog Devices (the AD7150/7151/7156 proximity and level sensors and the higher-precision AD7745/7746/7747) used in industrial and embedded designs for proximity detection, fluid-level sensing, and precision capacitive measurement. The parts have been shipping since the late 2000s and remain in production.
recommendation
Worth keeping but documenting its niche, because Analog Devices still lists both the AD7150 and AD7746 as in-production parts in 2025 and the kernel code continues to receive light maintenance touch-ups through 2026. There is no sign of a replacement driver or any removal discussion, so the directory should stay; a short note explaining its industrial-sensor scope would help future maintainers recognise it as a small but still-relevant chip family.
repository signals
sources
- lore.kernel.org
Recent upstream touch exists in 2026 for this directory, indicating the code is not abandoned.
- analog.com
AD7150 is listed by Analog Devices as PRODUCTION with pricing/sample-buy information, so at least part of this family was still sold new in 2025/2026.
- analog.com
AD7746 is listed by Analog Devices as PRODUCTION with pricing/sample-buy information, supporting continued new-sales availability for the other half of the driver directory.
codex reasoning notes (technical)
Local rg inspection of drivers/iio/cdc shows two real I2C sensor drivers: ad7150.c covers AD7150/1/6 and ad7746.c covers AD7745/6/7. lore_file_timeline MCP on both files showed activity through 2026, but the visible changes are low-volume maintenance/treewide cleanups rather than feature work; repeated lore_regex MCP attempts for removal/deprecation subjects timed out, so I found no evidence of active removal discussion. The AD7150 and AD7746 Analog Devices product pages were obtained via web search and both show PRODUCTION status, so the hardware is still sold and the driver should not be deprecated or removed. Recommendation is keep-annotate because this is a niche industrial/embedded sensor family with ongoing but light upstream attention and no obvious single replacement driver.