[v2,0/4] hwmon: Add support for Amphenol ChipCap 2

Message

Javier Carrasco Nov. 8, 2023, 3:37 p.m. UTC

This series adds support and documentation for the Amphenol ChipCap 2
humidity and temperature sensor in its digital version.

This I2C device 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 the 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 (a 'sleep' device) connected to a Raspberry Pi Zero 2 w.
Different device tree node definitions (with and without regulator,
ready and/or alarm signals) have been positively tested.

The non-sleep measurement mechanism has been inferred from the first
measurement, which is carried out automatically and it is common for all
part numbers. Any testing or improvements with a non-sleep device is
more than welcome.

The tests have also covered the properties added to the hwmon core to
account for minimum and maximum humidity alarms.

Signed-off-by: Javier Carrasco <[e-mail]>
---
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/[e-mail]

---
Javier Carrasco (4):
      dt-bindings: vendor-prefixes: add Amphenol
      hwmon: (core) Add support for humidity min/max alarm
      hwmon: Add support for Amphenol ChipCap 2
      dt-bindings: hwmon: Add Amphenol ChipCap 2

 .../bindings/hwmon/amphenol,chipcap2.yaml          |   68 ++
 .../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                           | 1022 ++++++++++++++++++++
 drivers/hwmon/hwmon.c                              |    2 +
 include/linux/hwmon.h                              |    4 +
 10 files changed, 1191 insertions(+)
---
base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa
change-id: 20231020-topic-chipcap2-e2d8985430c2

Best regards,