Re: MCP9808 iio or hwmon

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On 06/24/2016 05:36 PM, Alison Schofield wrote:
On Tue, Jun 21, 2016 at 04:42:46PM -0700, Guenter Roeck wrote:
On Tue, Jun 21, 2016 at 03:26:11PM -0700, Alison Schofield wrote:
On Tue, Jun 14, 2016 at 06:27:50AM -0700, Guenter Roeck wrote:
On 06/14/2016 01:22 AM, Daniel Baluta wrote:
[fixing IIO, hwmon lists emails]

On Tue, Jun 14, 2016 at 11:20 AM, Daniel Baluta <daniel.baluta@xxxxxxxxx> wrote:
On Tue, Jun 14, 2016 at 1:08 AM, Alison Schofield <amsfield22@xxxxxxxxx> wrote:

I was working on an iio driver for MCP9808 when Jonathan took notice
and suggested we have the iio or hwmon discussion.

So, where should this sensor driver reside?

http://ww1.microchip.com/downloads/en/DeviceDoc/25095A.pdf

It's a digital temp sensor with user programmable registers for
sensing applications.  Supports shutdown, low power modes,
specifying of event & critical output boundaries.  Can support
8 sensors on a single serial bus. Touted as 'ideal for sophisticated
multi-zone temperature-monitoring applications.'

This is debatable, looking to the datasheet this driver could reside
in both places.

Because this sensor has Industrial utility (e.g freezers, refrigerators) I
am inclined to say we should support it in IIO.


Literally every sensor has that utility.

Alternatively, you might consider adding its device ID to the jc42 driver.
If you want to be fancy, you could add optional support for resolution
selection to the driver.

Guenter

Hi Guenter,
I'm using the mcp9808 with the jc42 driver by instantiating it.

I've added the device ID info so that the .detect callback can recognize
it, but can't figure out how to test that.  When/how does that .detect
get called?  I am using the Diolan.

Not sure if it works, but try to load the the jc42 driver using modprobe
first, and _then_ insert the diolan adapter.

Guenter

Finally got it!  I had to add I2C_CLASS_SPD (jc42's class) to Diolan and
then follow the order you suggested.


Great. Can you send a patch for the jc42 driver ?

Thanks,
Guenter


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