linux-kernel - Re: How to use "DTV_FE_CAPABILITY" command for Frontend.h of Linux DVB

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Message-ID: <20210709154739.30394-1-yp.wu@mediatek.com>
Date:   Fri, 9 Jul 2021 23:47:39 +0800
From:   YP WU <yp.wu@...iatek.com>
To:     <mchehab@...nel.org>
CC:     <Jason-BF.Huang@...iatek.com>, <Lecopzer.Chen@...iatek.com>,
        <francis.lee@...iatek.com>, <gustavoars@...nel.org>,
        <hverkuil-cisco@...all.nl>, <leo.hsiao@...iatek.com>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <yp.wu@...iatek.com>
Subject: Re: How to use "DTV_FE_CAPABILITY" command for Frontend.h of Linux DVB

>From: YP WU <yp.wu@...iatek.com>
>>To: <mchehab@...nel.org>
>>Cc: <Jason-BF.Huang@...iatek.com>, <Lecopzer.Chen@...iatek.com>,
>>	<francis.lee@...iatek.com>, <gustavoars@...nel.org>,
>>	<hverkuil-cisco@...all.nl>, <leo.hsiao@...iatek.com>,
>>	<linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
>>	<yp.wu@...iatek.com>
>>Subject: Re: How to use "DTV_FE_CAPABILITY" command for Frontend.h of Linux DVB
>>Date: Fri, 2 Jul 2021 17:28:34 +0800
>>Message-ID: <20210702092834.11699-1-yp.wu@...iatek.com> (raw)
>>In-Reply-To: <20210623093312.6f9883a5@...o.lan>
>>
>>Hello, Mr.Mauro,
>><I need to understand more about the use case.
>>-> About use case, I describe below:
>>
>>	For our design of kernel, demod/tuner and LNB are registered to different frontend device nodes.
>>We want to implement property command to know if the frontend device node is LNB device or demod/tuner device.
>>If it is LNB device node, the value would return true
>>If it is demod/tuner device node, the value would return false.
>> 
>>Do you have better idea or suggestion for our usage?
>>Please let me know if your have better suggestion.
>>Very thank you for your help.
>>
>>BRs,
>>YP

Hello, Mr.Mauro,
	Frist of all, thanks for your reply.
Based on previous discussion, we think we can create a new property command to achieve our goal.
	A new property command "DTV_FE_LNB_CAPABILITY".
We can use "FE_GET_PROPERTY" with case "DTV_FE_LNB_CAPABILITY" to get LNB capability.
We also should add a new variable named "LNB_capability" in dtv_frontend_properties. Like below:
	bool LNB_capability;
If the device node is LNB, LNB_capability should set to TRUE.
If the device node is demod/tuner, LNB_capability should set to FALSE.

What's your opinion?
If you have a better idea or suggestion, please let me know.

Very thank you.

BRs,
YP