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

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Date:   Sun, 3 Sep 2023 01:54:06 -0400
From:   Douglas Gilbert <dgilbert@...erlog.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     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 2023-09-02 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:

--- powerz.c_orig	2023-09-02 13:47:14.754705791 -0400
+++ powerz.c	2023-09-02 23:22:54.783856587 -0400
@@ -250,6 +250,7 @@

  static const struct usb_device_id powerz_id_table[] = {
  	{ USB_DEVICE_INTERFACE_NUMBER(0x5FC9, 0x0063, 0x00) },	/* ChargerLAB POWER-Z 
KM003C */
+	{ USB_DEVICE_INTERFACE_NUMBER(0x5FC9, 0x0061, 0x00) },	/* ChargerLAB POWER-Z 
KM002C */
  	{ }
  };

Do you want a "Tested-by" on the patch as well?

Doug Gilbert