linux-kernel - Re: [PATCH v11] platform/x86: add lenovo wmi camera button driver

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Message-ID: <030beaf8-12e1-400a-b064-f17384e32714@redhat.com>
Date: Wed, 27 Mar 2024 11:54:55 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: 艾超 <aichao@...inos.cn>,
 Andy Shevchenko <andriy.shevchenko@...el.com>
Cc: "ilpo.jarvinen" <ilpo.jarvinen@...ux.intel.com>,
 linux-kernel <linux-kernel@...r.kernel.org>,
 platform-driver-x86 <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH v11] platform/x86: add lenovo wmi camera button driver

Hi Ai Chao,

On 3/26/24 3:54 AM, 艾超 wrote:
> Hi
> 
>  
> 
> WMI
> 
>> > The Camera button is a GPIO device. This driver receives ACPI notifyi
>> > when the camera button is switched on/off. This driver is used in
>> > Lenovo A70, it is a Computer integrated machine.
> 
>> > +config LENOVO_WMI_CAMERA
>> > + tristate "Lenovo WMI Camera Button driver"
>> > + depends on ACPI_WMI
>> > + depends on INPUT
> 
>> No COMPILE_TEST?
> 
>  
> 
> I compile this driver and used Evtest tool to test it on lenovo A70.
> 
> 
> ...
> 
>> > + /* obj->buffer.pointer[0] is camera mode:
>> > + * 0 camera close
>> > + * 1 camera open
>> > + */
> 
>> /*
>> * The correct multi-line comment style
>> * is depicted here.
>> */
> 
>  
> 
> Thanks, I will modify it.
> ...
> 
>> > + keycode = (camera_mode == SW_CAMERA_ON ?
>> > + KEY_CAMERA_ACCESS_ENABLE : KEY_CAMERA_ACCESS_DISABLE);
> 
>> Useless parentheses.
> 
>  
> 
> I think the parentheses is a good programming style and beneficial for reading.
> 
>  
> 
> ...
> 
>> > + ret = input_register_device(priv->idev);
>> > + if (ret)
>> > + return ret;
> 
>> > + mutex_init(&priv->notify_lock);
> 
>> Your mutex should be initialized before use. Have you tested that?
> 
>  
> 
> Yes, I tested it.
> 
> 
> ...
> 
>> > +static struct wmi_driver lenovo_wmi_driver = {
>> > + .driver = {
>> > + .name = "lenovo-wmi-camera",
>> > + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
>> > + },
>> > + .id_table = lenovo_wmi_id_table,
>> > + .no_singleton = true,
>> > + .probe = lenovo_wmi_probe,
>> > + .notify = lenovo_wmi_notify,
>> > + .remove = lenovo_wmi_remove,
>> > +};
>> > +
> 
>> Unneeded blank line.
> 
>  
> 
> Thanks, I will modify it.
> 
> 
>> > +module_wmi_driver(lenovo_wmi_driver);
> 
> ...
> 
>> > +MODULE_DEVICE_TABLE(wmi, lenovo_wmi_id_table);
> 
>> Please, move it closer to the respective table.
> 
>  
> 
> Thanks, I will modify it.

I have already merged this. I'll squash in fixes for the few
small code style remarks from Andy, so there is no need
to send a new version.

Regards,

Hans