bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-27 02:52:27 -04:00
Code Issues Packages Projects Releases Wiki Activity
1,308,806 Commits 1 Branch 928 Tags
4510319676bdf96da819599643809e5155ef3460
Commit Graph

3 Commits

Author SHA1 Message Date
Dimitri Fedrau
dea750f801 iio: temperature: mcp9600: add threshold events support 
The device has four programmable temperature alert outputs which can be
used to monitor hot or cold-junction temperatures and detect falling and
rising temperatures. It supports up to 255 degree celsius programmable
hysteresis. Each alert can be individually configured by setting following
options in the associated alert configuration register:
- monitor hot or cold junction temperature
- monitor rising or falling temperature
- set comparator or interrupt mode
- set output polarity
- enable alert

This patch binds alert outputs to iio events:
- alert1: hot junction, rising temperature
- alert2: hot junction, falling temperature
- alert3: cold junction, rising temperature
- alert4: cold junction, falling temperature

All outputs are set in comparator mode and polarity depends on interrupt
configuration.

Signed-off-by: Dimitri Fedrau <dima.fedrau@gmail.com>
Link: https://lore.kernel.org/r/20240604133639.959682-1-dima.fedrau@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-06-13 19:19:25 +01:00
Dimitri Fedrau
827dca3129 iio: temperature: mcp9600: Fix temperature reading for negative values 
Temperature is stored as 16bit value in two's complement format. Current
implementation ignores the sign bit. Make it aware of the sign bit by
using sign_extend32.

Fixes: 3f6b9598b6 ("iio: temperature: Add MCP9600 thermocouple EMF converter")
Signed-off-by: Dimitri Fedrau <dima.fedrau@gmail.com>
Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@gmail.com>
Tested-by: Andrew Hepp <andrew.hepp@ahepp.dev>
Link: https://lore.kernel.org/r/20240424185913.1177127-1-dima.fedrau@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2024-05-03 11:48:56 +01:00
Andrew Hepp
3f6b9598b6 iio: temperature: Add MCP9600 thermocouple EMF converter 
Add support for the MCP9600 thermocouple electromotive force converter. The sensor has  integrated cold junction compensation and a typical accuracy of 0.5 degrees Celsius. The driver supports a resolution of 0.0625 degrees Celsius.

Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/MCP960X-Data-Sheet-20005426.pdf
Signed-off-by: Andrew Hepp <andrew.hepp@ahepp.dev>
Link: https://lore.kernel.org/r/20231025233153.5454-2-andrew.hepp@ahepp.dev
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
 2023-11-16 19:10:28 +00:00