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Based on kernel version 3.9. Page generated on 2013-05-02 22:53 EST.

1	What:		/sys/devices/pnp0/<bus-num>/ppi/
2	Date:		August 2012
3	Kernel Version:	3.6
4	Contact:	xiaoyan.zhang@intel.com
5	Description:
6			This folder includes the attributes related with PPI (Physical
7			Presence Interface). Only if TPM is supported by BIOS, this
8			folder makes sense. The folder path can be got by command
9			'find /sys/ -name 'pcrs''. For the detail information of PPI,
10			please refer to the PPI specification from
11			http://www.trustedcomputinggroup.org/
12	
13	What:		/sys/devices/pnp0/<bus-num>/ppi/version
14	Date:		August 2012
15	Contact:	xiaoyan.zhang@intel.com
16	Description:
17			This attribute shows the version of the PPI supported by the
18			platform.
19			This file is readonly.
20	
21	What:		/sys/devices/pnp0/<bus-num>/ppi/request
22	Date:		August 2012
23	Contact:	xiaoyan.zhang@intel.com
24	Description:
25			This attribute shows the request for an operation to be
26			executed in the pre-OS environment. It is the only input from
27			the OS to the pre-OS environment. The request should be an
28			integer value range from 1 to 160, and 0 means no request.
29			This file can be read and written.
30	
31	What:		/sys/devices/pnp0/00:<bus-num>/ppi/response
32	Date:		August 2012
33	Contact:	xiaoyan.zhang@intel.com
34	Description:
35			This attribute shows the response to the most recent operation
36			request it acted upon. The format is "<request> <response num>
37			: <response description>".
38			This file is readonly.
39	
40	What:		/sys/devices/pnp0/<bus-num>/ppi/transition_action
41	Date:		August 2012
42	Contact:	xiaoyan.zhang@intel.com
43	Description:
44			This attribute shows the platform-specific action that should
45			take place in order to transition to the BIOS for execution of
46			a requested operation. The format is "<action num>: <action
47			description>".
48			This file is readonly.
49	
50	What:		/sys/devices/pnp0/<bus-num>/ppi/tcg_operations
51	Date:		August 2012
52	Contact:	xiaoyan.zhang@intel.com
53	Description:
54			This attribute shows whether it is allowed to request an
55			operation to be executed in the pre-OS environment by the BIOS
56			for the requests defined by TCG, i.e. requests from 1 to 22.
57			The format is "<request> <status num>: <status description>".
58			This attribute is only supported by PPI version 1.2+.
59			This file is readonly.
60	
61	What:		/sys/devices/pnp0/<bus-num>/ppi/vs_operations
62	Date:		August 2012
63	Contact:	xiaoyan.zhang@intel.com
64	Description:
65			This attribute shows whether it is allowed to request an
66			operation to be executed in the pre-OS environment by the BIOS
67			for the verdor specific requests, i.e. requests from 128 to
68			255. The format is same with tcg_operations. This attribute
69			is also only supported by PPI version 1.2+.
70			This file is readonly.
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