-----邮件原件-----
发件人: rfc@edk2.groups.io <rfc@edk2.groups.io> 代表 Laszlo Ersek
发送时间: 2021年3月24日 19:37
收件人: rfc@edk2.groups.io; nickle.wang@...
抄送: Dandan Bi <dandan.bi@...>; Chang, Abner (HPS SW/FW
Technologist) <abner.chang@...>
主题: Re: [edk2-rfc] [RFC] Have new interface in
EDKII_FORM_BROWSER_EXTENSION2_PROTOCOL to disable hotkey support

On 03/24/21 09:21, Nickle Wang wrote:

Hi All,

I am having trouble to disable hotkey support in HII browser with existing

interface. I am wondering if we could have new interface to disable hotkey
support in form browser extension2 protocol.

1. Background:
In some HII driver, there is no need to have hotkey support in certain HII

menu due to its design. The examples are EDK2 iSCSI driver, secure boot
configuration and Tls auth configuration driver. In these HII menus, there is HII
button to do submit or discard job and they do not answer to hotkey action. I
also see this design in 3rd party option card driver. In this case, user feels
confused because it dose not do anything while pressing hotkey. The only way
to save or discard data is by pressing the button on HII menu. So, we need to
disable hotkey support and force user to use HII button.

I agree with the problem statement. I've noticed this too, and found it
confusing.

I wonder if there are HII guidelines or best known practices to deal
with it -- I assume that one desirable solution might be if we could
control the hotkeys just from the VFR, one way or another. But indeed I
don't know if that's feasible by design.

UEFI driver write guide 12.6.1 Minimize callbacks section defines the guide line.
https://github.com/tianocore/tianocore.github.io/wiki/UEFI-Driver-Writer%27s-Guide

But, some HII drivers still like to control submit/discard/exit in its form by Callback function.
Hotkey way is to consume HII driver ConfigAccess protocol RouteConfig() function for data saving.
So, HotKey doesn't work on those drivers.

For this proposal, I want to understand when new interface will be trigged and what module calls this new API.

Thanks
Liming

Thanks
Laszlo

2. Issue:
Currently we have

EDKII_FORM_BROWSER_EXTENSION2_PROTOCOL.RegisterHotKey to create
or delete hotkey support. With value 0 in "Action", we can delete
corresponding hotkey.

typedef
EFI_STATUS
(EFIAPI *REGISTER_HOT_KEY) (
IN EFI_INPUT_KEY *KeyData,
IN UINT32 Action,
IN UINT16 DefaultId,
IN EFI_STRING HelpString OPTIONAL
);

However, there are some troubles for driver or option card driver to use it

and delete hotkey support.

* Usually, display engine is the one who creates hotkey in HII browser.

So driver has no information about the key data. And there is no way to get
these hotkey information programmatically.

* If driver tries to delete hotkey for its HII menu, it requires driver to

restore hokey support when user leaves its HII menu. This could easily break
the hotkey support in HII browser because display engine has no control to
this.

3. Proposal:
I would like to propose new interface in

EDKII_FORM_BROWSER_EXTENSION2_PROTOCOL so that driver can
temporarily disable hotkey support for certain HII menu in its own form-set.
And display engine will handle the hotkey support accordingly.

struct EDKII_FORM_BROWSER_EXTENSION2_PROTOCOL {
...
REGISTER_HOT_KEY RegisterHotKey;
DISABLE_HOT_KEY DisableHotKey;
...
};

/**
Disable the hotkey by given its browser action.

@param[in] Action Action value to disable corresponding hotkey.
@param[in] Scope Hotkey scope level to be disabled.

@retval EFI_SUCCESS Hotkey is disabled.
@retval EFI_NOT_FOUND Hotkey with given Action is not found.
**/
typedef
EFI_STATUS
(EFIAPI *DISABLE_HOT_KEY) (
IN UINT32 Action,
IN BROWSER_SETTING_SCOPE Scope
);



May I have your comment about this? Is this good idea for driver to disable

hotkey support?

Thanks,
Nickle