linux-kernel - Re: [PATCH v2] hwmon: Add LTC2990 sensor driver

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Date:	Wed, 13 Jan 2016 05:57:28 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Mike Looijmans <mike.looijmans@...ic.nl>, lm-sensors@...sensors.org
Cc:	jdelvare@...e.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: Add LTC2990 sensor driver

On 01/13/2016 05:51 AM, Mike Looijmans wrote:
> On 13-01-16 14:24, Guenter Roeck wrote:
>> On 01/13/2016 03:05 AM, Mike Looijmans wrote:
>>> This adds support for the Linear Technology LTC2990  I2C System Monitor.
>>> The LTC2990 supports a combination of voltage, current and temperature
>>> monitoring. This driver currently only supports reading two currents
>>> by measuring two differential voltages across series resistors, in
>>> addition to the Vcc supply voltage and internal temperature.
>>>
>>> This is sufficient to support the Topic Miami SOM which uses this chip
>>> to monitor the currents flowing into the FPGA and the CPU parts.
>>>
>>> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
>>
>> Mike,
>>
>> That looks much better. Can you send me the output of i2cdump for the chip ?
>> That would help me writing module test code for it.
>
> I'm kinda interested into how that would work.
>
https://github.com/groeck/module-tests

> I'll have to remove the driver first to get i2cdump to work on the chip. I cannot force a device removal from user space while running, can I?
> And i suppose you want a dump of a chip in running status? (On boot, all are registers are simply set to zero)
>

Just use i2cdump -f while the driver is active.

Thanks,
Guenter