linux-kernel - Re: [PATCH v4] hwmon: add POWER-Z driver

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Message-ID: <2743f7d5-9e8d-4a61-ba4a-d47bf26b6f62@t-8ch.de>
Date:   Sun, 3 Sep 2023 17:08:25 +0200
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     Douglas Gilbert <dgilbert@...erlog.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v4] hwmon: add POWER-Z driver

On 2023-09-03 10:54:06-0400, Douglas Gilbert wrote:
> On 2023-09-03 07:46, Guenter Roeck wrote:
> > On 9/2/23 22:54, Douglas Gilbert wrote:
> > > On 2023-09-02 18:56, Guenter Roeck wrote:
> > > > On 9/2/23 15:29, Thomas Weißschuh wrote:
> > > > > Hi,
> > > > > 
> > > > > On 2023-09-02 18:36:17+0200, Christophe JAILLET wrote:
> > > > > > Le 02/09/2023 à 09:47, Thomas Weißschuh a écrit :
> > > > > > > POWER-Z is a series of devices to monitor power characteristics of
> > > > > > > USB-C connections and display those on a on-device display.
> > > > > > > Some of the devices, notably KM002C and KM003C, contain an additional
> > > > > > > port which exposes the measurements via USB.
> > > > > > > 
> > > > > > > This is a driver for this monitor port.
> > > > > > > 
> > > > > > > It was developed and tested with the KM003C.
> > > > > > > 
> > > > > > > Signed-off-by: Thomas Weißschuh
> > > > > > > <linux-9XfqOkM5JgxKQ7RDE2T8Pw@...lic.gmane.org>
> > > > > > > ---
> > > > > > 
> > > > > > ...
> > > > > > 
> > > > > > > +static int powerz_probe(struct usb_interface *intf,
> > > > > > > +            const struct usb_device_id *id)
> > > > > > > +{
> > > > > > > +    struct powerz_priv *priv;
> > > > > > > +    struct device *hwmon_dev;
> > > > > > > +    struct device *parent;
> > > > > > > +
> > > > > > > +    parent = &intf->dev;
> > > > > > > +
> > > > > > > +    priv = devm_kzalloc(parent, sizeof(*priv), GFP_KERNEL);
> > > > > > > +    if (!priv)
> > > > > > > +        return -ENOMEM;
> > > > > > > +
> > > > > > > +    priv->urb = usb_alloc_urb(0, GFP_KERNEL);
> > > > > > > +    if (!priv->urb)
> > > > > > > +        return -ENOMEM;
> > > > > > > +    mutex_init(&priv->mutex);
> > > > > > > +    priv->status = -ETIMEDOUT;
> > > > > > > +    init_completion(&priv->completion);
> > > > > > > +
> > > > > > > +    hwmon_dev =
> > > > > > > +        devm_hwmon_device_register_with_info(parent, DRIVER_NAME, priv,
> > > > > > > +                         &powerz_chip_info, NULL);
> > > > > > > +    usb_set_intfdata(intf, priv);
> > > > > > > +
> > > > > > > +    return PTR_ERR_OR_ZERO(hwmon_dev);
> > > > > > 
> > > > > > Hi,
> > > > > > 
> > > > > > If 'hwmon_dev' is an PTR_ERR, priv->urb leaks.
> > > > > 
> > > > > Good catch, thanks!
> > > > > 
> > > > > 
> > > > > Guenter,
> > > > > 
> > > > > it seems the new hwmon-next with this driver has not yet been pushed to
> > > > > git.kernel.org, so I can't generate the Fixes tag.
> > > > > 
> > > > 
> > > > Rule is that I must not push anything into linux-next until
> > > > after v6.6-rc1 has been released.
> > > > 
> > > > > Can you modify the commit to also contain the changes below?
> > > > > Or let me know if you prefer something else.
> > > > > 
> > > > 
> > > > I'll update the patch and make the change.
> > > 
> > > Hi,
> > > While you are at it, you can make the driver detect the earlier model KM002C:
> > > 
> > 
> > Please send a separate patch to do that.
> 
> That would be easier if I could see a git repository with the powerz driver
> in it. Looking at:
>    https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git/
> 
> or is there another url to use?

As mentioned by Guenter above this can only be pushed after 6.6-rc1 is
released which should be next weekend.

So let's wait until then. If you want I can take care of submitting the
KM002C patch when it's time.

Thanks for your testing!


Thomas