1What:		/sys/class/tpm/tpmX/device/
2Date:		April 2005
3KernelVersion:	2.6.12
4Contact:	linux-integrity@vger.kernel.org
5Description:	The device/ directory under a specific TPM instance exposes
6		the properties of that TPM chip
7
8
9What:		/sys/class/tpm/tpmX/device/active
10Date:		April 2006
11KernelVersion:	2.6.17
12Contact:	linux-integrity@vger.kernel.org
13Description:	The "active" property prints a '1' if the TPM chip is accepting
14		commands. An inactive TPM chip still contains all the state of
15		an active chip (Storage Root Key, NVRAM, etc), and can be
16		visible to the OS, but will only accept a restricted set of
17		commands. See the TPM Main Specification part 2, Structures,
18		section 17 for more information on which commands are
19		available.
20
21What:		/sys/class/tpm/tpmX/device/cancel
22Date:		June 2005
23KernelVersion:	2.6.13
24Contact:	linux-integrity@vger.kernel.org
25Description:	The "cancel" property allows you to cancel the currently
26		pending TPM command. Writing any value to cancel will call the
27		TPM vendor specific cancel operation.
28
29What:		/sys/class/tpm/tpmX/device/caps
30Date:		April 2005
31KernelVersion:	2.6.12
32Contact:	linux-integrity@vger.kernel.org
33Description:	The "caps" property contains TPM manufacturer and version info.
34
35		Example output::
36
37		  Manufacturer: 0x53544d20
38		  TCG version: 1.2
39		  Firmware version: 8.16
40
41		Manufacturer is a hex dump of the 4 byte manufacturer info
42		space in a TPM. TCG version shows the TCG TPM spec level that
43		the chip supports. Firmware version is that of the chip and
44		is manufacturer specific.
45
46What:		/sys/class/tpm/tpmX/device/durations
47Date:		March 2011
48KernelVersion:	3.1
49Contact:	linux-integrity@vger.kernel.org
50Description:	The "durations" property shows the 3 vendor-specific values
51		used to wait for a short, medium and long TPM command. All
52		TPM commands are categorized as short, medium or long in
53		execution time, so that the driver doesn't have to wait
54		any longer than necessary before starting to poll for a
55		result.
56
57		Example output::
58
59		  3015000 4508000 180995000 [original]
60
61		Here the short, medium and long durations are displayed in
62		usecs. "[original]" indicates that the values are displayed
63		unmodified from when they were queried from the chip.
64		Durations can be modified in the case where a buggy chip
65		reports them in msec instead of usec and they need to be
66		scaled to be displayed in usecs. In this case "[adjusted]"
67		will be displayed in place of "[original]".
68
69What:		/sys/class/tpm/tpmX/device/enabled
70Date:		April 2006
71KernelVersion:	2.6.17
72Contact:	linux-integrity@vger.kernel.org
73Description:	The "enabled" property prints a '1' if the TPM chip is enabled,
74		meaning that it should be visible to the OS. This property
75		may be visible but produce a '0' after some operation that
76		disables the TPM.
77
78What:		/sys/class/tpm/tpmX/device/owned
79Date:		April 2006
80KernelVersion:	2.6.17
81Contact:	linux-integrity@vger.kernel.org
82Description:	The "owned" property produces a '1' if the TPM_TakeOwnership
83		ordinal has been executed successfully in the chip. A '0'
84		indicates that ownership hasn't been taken.
85
86What:		/sys/class/tpm/tpmX/device/pcrs
87Date:		April 2005
88KernelVersion:	2.6.12
89Contact:	linux-integrity@vger.kernel.org
90Description:	The "pcrs" property will dump the current value of all Platform
91		Configuration Registers in the TPM. Note that since these
92		values may be constantly changing, the output is only valid
93		for a snapshot in time.
94
95		Example output::
96
97		  PCR-00: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
98		  PCR-01: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
99		  PCR-02: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
100		  PCR-03: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
101		  PCR-04: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75
102		  ...
103
104		The number of PCRs and hex bytes needed to represent a PCR
105		value will vary depending on TPM chip version. For TPM 1.1 and
106		1.2 chips, PCRs represent SHA-1 hashes, which are 20 bytes
107		long. Use the "caps" property to determine TPM version.
108
109What:		/sys/class/tpm/tpmX/device/pubek
110Date:		April 2005
111KernelVersion:	2.6.12
112Contact:	linux-integrity@vger.kernel.org
113Description:	The "pubek" property will return the TPM's public endorsement
114		key if possible. If the TPM has had ownership established and
115		is version 1.2, the pubek will not be available without the
116		owner's authorization. Since the TPM driver doesn't store any
117		secrets, it can't authorize its own request for the pubek,
118		making it unaccessible. The public endorsement key is gener-
119		ated at TPM manufacture time and exists for the life of the
120		chip.
121
122		Example output::
123
124		  Algorithm: 00 00 00 01
125		  Encscheme: 00 03
126		  Sigscheme: 00 01
127		  Parameters: 00 00 08 00 00 00 00 02 00 00 00 00
128		  Modulus length: 256
129		  Modulus:
130		  B4 76 41 82 C9 20 2C 10 18 40 BC 8B E5 44 4C 6C
131		  3A B2 92 0C A4 9B 2A 83 EB 5C 12 85 04 48 A0 B6
132		  1E E4 81 84 CE B2 F2 45 1C F0 85 99 61 02 4D EB
133		  86 C4 F7 F3 29 60 52 93 6B B2 E5 AB 8B A9 09 E3
134		  D7 0E 7D CA 41 BF 43 07 65 86 3C 8C 13 7A D0 8B
135		  82 5E 96 0B F8 1F 5F 34 06 DA A2 52 C1 A9 D5 26
136		  0F F4 04 4B D9 3F 2D F2 AC 2F 74 64 1F 8B CD 3E
137		  1E 30 38 6C 70 63 69 AB E2 50 DF 49 05 2E E1 8D
138		  6F 78 44 DA 57 43 69 EE 76 6C 38 8A E9 8E A3 F0
139		  A7 1F 3C A8 D0 12 15 3E CA 0E BD FA 24 CD 33 C6
140		  47 AE A4 18 83 8E 22 39 75 93 86 E6 FD 66 48 B6
141		  10 AD 94 14 65 F9 6A 17 78 BD 16 53 84 30 BF 70
142		  E0 DC 65 FD 3C C6 B0 1E BF B9 C1 B5 6C EF B1 3A
143		  F8 28 05 83 62 26 11 DC B4 6B 5A 97 FF 32 26 B6
144		  F7 02 71 CF 15 AE 16 DD D1 C1 8E A8 CF 9B 50 7B
145		  C3 91 FF 44 1E CF 7C 39 FE 17 77 21 20 BD CE 9B
146
147		Possible values::
148
149		  Algorithm:	TPM_ALG_RSA			(1)
150		  Encscheme:	TPM_ES_RSAESPKCSv15		(2)
151				TPM_ES_RSAESOAEP_SHA1_MGF1	(3)
152		  Sigscheme:	TPM_SS_NONE			(1)
153		  Parameters, a byte string of 3 u32 values:
154			Key Length (bits):	00 00 08 00	(2048)
155			Num primes:		00 00 00 02	(2)
156			Exponent Size:		00 00 00 00	(0 means the
157								 default exp)
158		  Modulus Length: 256 (bytes)
159		  Modulus:	The 256 byte Endorsement Key modulus
160
161What:		/sys/class/tpm/tpmX/device/temp_deactivated
162Date:		April 2006
163KernelVersion:	2.6.17
164Contact:	linux-integrity@vger.kernel.org
165Description:	The "temp_deactivated" property returns a '1' if the chip has
166		been temporarily deactivated, usually until the next power
167		cycle. Whether a warm boot (reboot) will clear a TPM chip
168		from a temp_deactivated state is platform specific.
169
170What:		/sys/class/tpm/tpmX/device/timeouts
171Date:		March 2011
172KernelVersion:	3.1
173Contact:	linux-integrity@vger.kernel.org
174Description:	The "timeouts" property shows the 4 vendor-specific values
175		for the TPM's interface spec timeouts. The use of these
176		timeouts is defined by the TPM interface spec that the chip
177		conforms to.
178
179		Example output::
180
181		  750000 750000 750000 750000 [original]
182
183		The four timeout values are shown in usecs, with a trailing
184		"[original]" or "[adjusted]" depending on whether the values
185		were scaled by the driver to be reported in usec from msecs.
186
187What:		/sys/class/tpm/tpmX/tpm_version_major
188Date:		October 2019
189KernelVersion:	5.5
190Contact:	linux-integrity@vger.kernel.org
191Description:	The "tpm_version_major" property shows the TCG spec major version
192		implemented by the TPM device.
193
194		Example output::
195
196		  2
197