2 * Copyright (C) 2004 IBM Corporation
4 * Leendert van Doorn <leendert@watson.ibm.com>
5 * Dave Safford <safford@watson.ibm.com>
6 * Reiner Sailer <sailer@watson.ibm.com>
7 * Kylene Hall <kjhall@us.ibm.com>
9 * Copyright (C) 2013 Obsidian Research Corp
10 * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
12 * sysfs filesystem inspection interface to the TPM
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation, version 2 of the
20 #include <linux/device.h>
23 #define READ_PUBEK_RESULT_SIZE 314
24 #define TPM_ORD_READPUBEK cpu_to_be32(124)
25 static struct tpm_input_header tpm_readpubek_header = {
26 .tag = TPM_TAG_RQU_COMMAND,
27 .length = cpu_to_be32(30),
28 .ordinal = TPM_ORD_READPUBEK
30 static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
34 struct tpm_cmd_t tpm_cmd;
39 struct tpm_chip *chip = to_tpm_chip(dev);
41 tpm_cmd.header.in = tpm_readpubek_header;
42 err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, 0,
43 "attempting to read the PUBEK");
48 ignore header 10 bytes
49 algorithm 32 bits (1 == RSA )
52 parameters (RSA 12->bytes: keybit, #primes, expbit)
55 ignore checksum 20 bytes
57 data = tpm_cmd.params.readpubek_out_buffer;
60 "Algorithm: %02X %02X %02X %02X\n"
61 "Encscheme: %02X %02X\n"
62 "Sigscheme: %02X %02X\n"
63 "Parameters: %02X %02X %02X %02X "
64 "%02X %02X %02X %02X "
65 "%02X %02X %02X %02X\n"
66 "Modulus length: %d\n"
68 data[0], data[1], data[2], data[3],
71 data[12], data[13], data[14], data[15],
72 data[16], data[17], data[18], data[19],
73 data[20], data[21], data[22], data[23],
74 be32_to_cpu(*((__be32 *) (data + 24))));
76 for (i = 0; i < 256; i++) {
77 str += sprintf(str, "%02X ", data[i + 28]);
78 if ((i + 1) % 16 == 0)
79 str += sprintf(str, "\n");
85 static DEVICE_ATTR_RO(pubek);
87 static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
91 u8 digest[TPM_DIGEST_SIZE];
95 struct tpm_chip *chip = to_tpm_chip(dev);
97 rc = tpm_getcap(chip, TPM_CAP_PROP_PCR, &cap,
98 "attempting to determine the number of PCRS");
102 num_pcrs = be32_to_cpu(cap.num_pcrs);
103 for (i = 0; i < num_pcrs; i++) {
104 rc = tpm_pcr_read_dev(chip, i, digest);
107 str += sprintf(str, "PCR-%02d: ", i);
108 for (j = 0; j < TPM_DIGEST_SIZE; j++)
109 str += sprintf(str, "%02X ", digest[j]);
110 str += sprintf(str, "\n");
114 static DEVICE_ATTR_RO(pcrs);
116 static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
122 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
123 "attempting to determine the permanent enabled state");
127 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
130 static DEVICE_ATTR_RO(enabled);
132 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
138 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_PERM, &cap,
139 "attempting to determine the permanent active state");
143 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
146 static DEVICE_ATTR_RO(active);
148 static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
154 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
155 "attempting to determine the owner state");
159 rc = sprintf(buf, "%d\n", cap.owned);
162 static DEVICE_ATTR_RO(owned);
164 static ssize_t temp_deactivated_show(struct device *dev,
165 struct device_attribute *attr, char *buf)
170 rc = tpm_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
171 "attempting to determine the temporary state");
175 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
178 static DEVICE_ATTR_RO(temp_deactivated);
180 static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
183 struct tpm_chip *chip = to_tpm_chip(dev);
188 rc = tpm_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
189 "attempting to determine the manufacturer");
192 str += sprintf(str, "Manufacturer: 0x%x\n",
193 be32_to_cpu(cap.manufacturer_id));
195 /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
196 rc = tpm_getcap(chip, CAP_VERSION_1_2, &cap,
197 "attempting to determine the 1.2 version");
200 "TCG version: %d.%d\nFirmware version: %d.%d\n",
201 cap.tpm_version_1_2.Major,
202 cap.tpm_version_1_2.Minor,
203 cap.tpm_version_1_2.revMajor,
204 cap.tpm_version_1_2.revMinor);
206 /* Otherwise just use TPM_STRUCT_VER */
207 rc = tpm_getcap(chip, CAP_VERSION_1_1, &cap,
208 "attempting to determine the 1.1 version");
212 "TCG version: %d.%d\nFirmware version: %d.%d\n",
213 cap.tpm_version.Major,
214 cap.tpm_version.Minor,
215 cap.tpm_version.revMajor,
216 cap.tpm_version.revMinor);
221 static DEVICE_ATTR_RO(caps);
223 static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
224 const char *buf, size_t count)
226 struct tpm_chip *chip = to_tpm_chip(dev);
230 chip->ops->cancel(chip);
233 static DEVICE_ATTR_WO(cancel);
235 static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
238 struct tpm_chip *chip = to_tpm_chip(dev);
240 if (chip->duration[TPM_LONG] == 0)
243 return sprintf(buf, "%d %d %d [%s]\n",
244 jiffies_to_usecs(chip->duration[TPM_SHORT]),
245 jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
246 jiffies_to_usecs(chip->duration[TPM_LONG]),
247 chip->duration_adjusted
248 ? "adjusted" : "original");
250 static DEVICE_ATTR_RO(durations);
252 static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
255 struct tpm_chip *chip = to_tpm_chip(dev);
257 return sprintf(buf, "%d %d %d %d [%s]\n",
258 jiffies_to_usecs(chip->timeout_a),
259 jiffies_to_usecs(chip->timeout_b),
260 jiffies_to_usecs(chip->timeout_c),
261 jiffies_to_usecs(chip->timeout_d),
262 chip->timeout_adjusted
263 ? "adjusted" : "original");
265 static DEVICE_ATTR_RO(timeouts);
267 static struct attribute *tpm_dev_attrs[] = {
268 &dev_attr_pubek.attr,
270 &dev_attr_enabled.attr,
271 &dev_attr_active.attr,
272 &dev_attr_owned.attr,
273 &dev_attr_temp_deactivated.attr,
275 &dev_attr_cancel.attr,
276 &dev_attr_durations.attr,
277 &dev_attr_timeouts.attr,
281 static const struct attribute_group tpm_dev_group = {
282 .attrs = tpm_dev_attrs,
285 void tpm_sysfs_add_device(struct tpm_chip *chip)
287 /* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
288 * is called before ops is null'd and the sysfs core synchronizes this
289 * removal so that no callbacks are running or can run again
291 WARN_ON(chip->groups_cnt != 0);
292 chip->groups[chip->groups_cnt++] = &tpm_dev_group;