diff options
| author | Javier Carrasco <javier.carrasco.cruz@gmail.com> | 2024-01-30 22:06:48 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2024-02-25 12:37:37 -0800 |
| commit | 3af350929e752fe72f0457033d448bff9aac695a (patch) | |
| tree | 3dffbb7c4d33a4982df300e2838186531a7d4841 /Documentation/hwmon/index.rst | |
| parent | 8f89ac2b9bdec95e4a05612a198b4255dce2ca8a (diff) | |
hwmon: Add support for Amphenol ChipCap 2
The Amphenol ChipCap 2 is a capacitive polymer humidity and temperature
sensor with an integrated EEPROM and minimum/maximum humidity alarms.
All device variants offer an I2C interface and depending on the part
number, two different output modes:
- CC2D: digital output
- CC2A: analog (PDM) output
This driver adds support for the digital variant (CC2D part numbers),
which includes the following part numbers:
- non-sleep measurement mode (CC2D23, CC2D25, CC2D33, CC2D35)
- sleep measurement mode (CC2D23S, CC2D25S, CC2D33S, CC2D35S)
The Chipcap 2 EEPROM can be accessed to configure a series of parameters
like the minimum/maximum humidity alarm threshold and hysteresis. The
EEPROM is only accessible in the command window after a power-on reset.
The default window lasts 10 ms if no Start_CM command is sent. After the
command window is finished (either after the mentioned timeout of after
a Start_NOM command is sent), the device enters the normal operation
mode and makes a first measurement automatically.
Unfortunately, the device does not provide any hardware or software
reset and therefore the driver must trigger power cycles to enter the
command mode. A dedicated, external regulator is required for that.
This driver keeps the device off until a measurement or access to the
EEPROM is required, making use of the first automatic measurement to
avoid different code paths for sleep and non-sleep devices.
The minimum and maximum humidity alarms are configured with two
registers per alarm: one stores the alarm threshold and the other one
keeps the value that turns off the alarm. The alarm signals are only
updated when a measurement is carried out.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240130-topic-chipcap2-v6-5-260bea05cf9b@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/hwmon/index.rst')
| -rw-r--r-- | Documentation/hwmon/index.rst | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst index 9ac087dd3e78..0d12254c0f9e 100644 --- a/Documentation/hwmon/index.rst +++ b/Documentation/hwmon/index.rst @@ -51,6 +51,7 @@ Hardware Monitoring Kernel Drivers bel-pfe bpa-rs600 bt1-pvt + chipcap2 coretemp corsair-cpro corsair-psu |