linux-kernel - Re: [tpmdd-devel] [PATCH] tpm: Add sysfs interface to show TPM hardware version

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Message-ID: <074515F2-51E7-485B-B1AB-11B913CC4B46@gmx.de>
Date:   Tue, 14 Mar 2017 19:58:37 +0100
From:   Peter Huewe <peterhuewe@....de>
To:     tpmdd-devel@...ts.sourceforge.net,
        Ken Goldman <kgold@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH] tpm: Add sysfs interface to show TPM hardware version



Am 14. März 2017 19:18:15 MEZ schrieb Ken Goldman <kgold@...ux.vnet.ibm.com>:
>On 3/13/2017 3:10 AM, Peter Huewe wrote:
>
>> And yes you are right there is currently no way, except for trial and
>> error, for the userspace to determine this. So an interface to get
>> this information makes sense to me.
>
>In practice, I suspect that a single user space application won't
>support both TPMs. 
Think of init scripts.
Which daemon should it start?


> It will send the first command, get an error
>response code that says it's the wrong TPM, and exit.
>
>Note that, although there is no overlap in the command API, the packet
>format is compatible enough that a meaningful response can be returned.
>
>
>
>
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