linux-kernel - Re: [PATCH v2] hwmon: add driver for NZXT Kraken X42/X52/X62/X72

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Message-ID: <20210320062949.h2ggfmzq7lyn3zsi@calvin.localdomain>
Date:   Sat, 20 Mar 2021 03:29:49 -0300
From:   Jonas Malaco <jonas@...tocubo.io>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-hwmon@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        linux-input@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] hwmon: add driver for NZXT Kraken X42/X52/X62/X72

On Fri, Mar 19, 2021 at 02:26:40PM -0700, Guenter Roeck wrote:
> On Fri, Mar 19, 2021 at 01:55:44AM -0300, Jonas Malaco wrote:
> > These are "all-in-one" CPU liquid coolers that can be monitored and
> > controlled through a proprietary USB HID protocol.
> > 
> > While the models have differently sized radiators and come with varying
> > numbers of fans, they are all indistinguishable at the software level.
> > 
> > The driver exposes fan/pump speeds and coolant temperature through the
> > standard hwmon sysfs interface.
> > 
> > Fan and pump control, while supported by the devices, are not currently
> > exposed.  The firmware accepts up to 61 trip points per channel
> > (fan/pump), but the same set of trip temperatures has to be maintained
> > for both; with pwmX_auto_point_Y_temp attributes, users would need to
> > maintain this invariant themselves.
> > 
> > Instead, fan and pump control, as well as LED control (which the device
> > also supports for 9 addressable RGB LEDs on the CPU water block) are
> > left for existing and already mature user-space tools, which can still
> > be used alongside the driver, thanks to hidraw.  A link to one, which I
> > also maintain, is provided in the documentation.
> > 
> > The implementation is based on USB traffic analysis.  It has been
> > runtime tested on x86_64, both as a built-in driver and as a module.
> > 
> > Signed-off-by: Jonas Malaco <jonas@...tocubo.io>
> 
> Applied (after removing the now unnecessary spinlock.h include).

Thanks for catching/fixing that.

Jonas

> 
> Thanks,
> Guenter