This series adds support and documentation for the Amphenol ChipCap 2 humidity and temperature sensor in its digital version. The Chipcap 2 is an I2C device that provides 14-bit humidity and temperature measurements as well as low (minimum) and high (maximum) humidity alarms. A ready signal is also available to reduce delays while fetching data. The proposed driver implements the logic to perform measurements with and without ready signal, EEPROM configuration and alarm signaling. The features this driver does not support (I2C address and command window length modification) have been documented in the "Known Issues" section. The complete supported functionality has been tested with a CC2D33S sensor connected to a Raspberry Pi Zero 2 w. Different device tree node definitions (with and without ready and/or alarm signals) have been positively tested. Signed-off-by: Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx> --- Changes in v6: - chipcap2.c: remove TODO about regulator delays (handled by the regulator core). - chipcap2.c: add comment to clarify regularor enable checks (exclusive regulator). - chipcap2.c: simplify irq handling (irqs disabled while the device is switched off). - Link to v5: https://lore.kernel.org/r/20240115-topic-chipcap2-v5-0-0cc7a15aeece@xxxxxxxxx Changes in v5: - dt-bindings: add "amphenol,cc2d23" to "compatible" in the example. - Link to v4: https://lore.kernel.org/r/20231020-topic-chipcap2-v4-0-7940cfa7613a@xxxxxxxxx Changes in v4: - chipcap2.c: require exclusive regulator to trigger command mode. - chipcap2.c: keep the device off until a measurement is required. Because the device makes an automatic measurement after the power-up sequence, no differentiation between sleep and non-sleep modes is required anymore. - chipcap2.c: retrieve alarm settings from the device instead of storing them locally. - dt-bindings: add vdd-supply to required properties. - dt-bindings: default to 'amphenol,cc2d23' compatible (same functionality for all compatibles). - Link to v3: https://lore.kernel.org/r/20231020-topic-chipcap2-v3-0-5b3bb50a5f0b@xxxxxxxxx Changes in v3: - ABI: sysfs-class-hwmon: documented humidity min/max alarms. - General: reorder patches (bindings first to remove checkpatch warnings). - General: remove part number wildcards and use real part numbers. - chipcap2.c: improve error path in probe function. - chipcap2.c: fix error handling if regulator could not be registered. - chipcap2.c: use absolute values for hysteresis (for both ABI compatibility and simplicity). - chipcap2.c: minor code-style fixes and variable renaming. - Link to v2: https://lore.kernel.org/r/20231020-topic-chipcap2-v2-0-f5c325966fdb@xxxxxxxxx Changes in v2: - vendor-prefixes: full company name in the vendor description (Krzystof Kozlowski) - chipcap2.c: proper i2c_device_id table, coding style fixes, cleaner error path in the probe function (Krzystof Kozlowski) - dt-bindings: per-item description and lowercase names (Krzystof Kozlowski) - MAINTAINERS: fix manufacturer name (Krzystof Kozlowski) - Link to v1: https://lore.kernel.org/r/20231020-topic-chipcap2-v1-0-087e21d4b1ed@xxxxxxxxx --- Javier Carrasco (5): dt-bindings: vendor-prefixes: add Amphenol hwmon: (core) Add support for humidity min/max alarm ABI: sysfs-class-hwmon: add descriptions for humidity min/max alarms dt-bindings: hwmon: Add Amphenol ChipCap 2 hwmon: Add support for Amphenol ChipCap 2 Documentation/ABI/testing/sysfs-class-hwmon | 18 + .../bindings/hwmon/amphenol,chipcap2.yaml | 77 ++ .../devicetree/bindings/vendor-prefixes.yaml | 2 + Documentation/hwmon/chipcap2.rst | 73 ++ Documentation/hwmon/index.rst | 1 + MAINTAINERS | 8 + drivers/hwmon/Kconfig | 10 + drivers/hwmon/Makefile | 1 + drivers/hwmon/chipcap2.c | 816 +++++++++++++++++++++ drivers/hwmon/hwmon.c | 2 + include/linux/hwmon.h | 4 + 11 files changed, 1012 insertions(+) --- base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d change-id: 20231020-topic-chipcap2-e2d8985430c2 Best regards, -- Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
