1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2004 IBM Corporation
5 * Leendert van Doorn <leendert@watson.ibm.com>
6 * Dave Safford <safford@watson.ibm.com>
7 * Reiner Sailer <sailer@watson.ibm.com>
8 * Kylene Hall <kjhall@us.ibm.com>
10 * Copyright (C) 2013 Obsidian Research Corp
11 * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
13 * sysfs filesystem inspection interface to the TPM
15 #include <linux/device.h>
18 struct tpm_readpubek_out {
29 #define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
30 #define TPM_ORD_READPUBEK 124
32 static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
35 struct tpm_buf tpm_buf;
36 struct tpm_readpubek_out *out;
39 struct tpm_chip *chip = to_tpm_chip(dev);
42 memset(&anti_replay, 0, sizeof(anti_replay));
44 if (tpm_try_get_ops(chip))
47 if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
50 tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
52 if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
53 "attempting to read the PUBEK"))
56 out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
59 "Algorithm: %02X %02X %02X %02X\n"
60 "Encscheme: %02X %02X\n"
61 "Sigscheme: %02X %02X\n"
62 "Parameters: %02X %02X %02X %02X "
63 "%02X %02X %02X %02X "
64 "%02X %02X %02X %02X\n"
65 "Modulus length: %d\n"
67 out->algorithm[0], out->algorithm[1], out->algorithm[2],
69 out->encscheme[0], out->encscheme[1],
70 out->sigscheme[0], out->sigscheme[1],
71 out->parameters[0], out->parameters[1],
72 out->parameters[2], out->parameters[3],
73 out->parameters[4], out->parameters[5],
74 out->parameters[6], out->parameters[7],
75 out->parameters[8], out->parameters[9],
76 out->parameters[10], out->parameters[11],
77 be32_to_cpu(out->keysize));
79 for (i = 0; i < 256; i++) {
80 str += sprintf(str, "%02X ", out->modulus[i]);
81 if ((i + 1) % 16 == 0)
82 str += sprintf(str, "\n");
86 tpm_buf_destroy(&tpm_buf);
91 static DEVICE_ATTR_RO(pubek);
93 static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
97 u8 digest[TPM_DIGEST_SIZE];
100 struct tpm_chip *chip = to_tpm_chip(dev);
102 if (tpm_try_get_ops(chip))
105 if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
106 "attempting to determine the number of PCRS",
107 sizeof(cap.num_pcrs))) {
112 num_pcrs = be32_to_cpu(cap.num_pcrs);
113 for (i = 0; i < num_pcrs; i++) {
114 if (tpm1_pcr_read(chip, i, digest)) {
118 str += sprintf(str, "PCR-%02d: ", i);
119 for (j = 0; j < TPM_DIGEST_SIZE; j++)
120 str += sprintf(str, "%02X ", digest[j]);
121 str += sprintf(str, "\n");
126 static DEVICE_ATTR_RO(pcrs);
128 static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
131 struct tpm_chip *chip = to_tpm_chip(dev);
135 if (tpm_try_get_ops(chip))
138 if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
139 "attempting to determine the permanent enabled state",
140 sizeof(cap.perm_flags)))
143 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
148 static DEVICE_ATTR_RO(enabled);
150 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
153 struct tpm_chip *chip = to_tpm_chip(dev);
157 if (tpm_try_get_ops(chip))
160 if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
161 "attempting to determine the permanent active state",
162 sizeof(cap.perm_flags)))
165 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
170 static DEVICE_ATTR_RO(active);
172 static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
175 struct tpm_chip *chip = to_tpm_chip(dev);
179 if (tpm_try_get_ops(chip))
182 if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
183 "attempting to determine the owner state",
187 rc = sprintf(buf, "%d\n", cap.owned);
192 static DEVICE_ATTR_RO(owned);
194 static ssize_t temp_deactivated_show(struct device *dev,
195 struct device_attribute *attr, char *buf)
197 struct tpm_chip *chip = to_tpm_chip(dev);
201 if (tpm_try_get_ops(chip))
204 if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
205 "attempting to determine the temporary state",
206 sizeof(cap.stclear_flags)))
209 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
214 static DEVICE_ATTR_RO(temp_deactivated);
216 static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
219 struct tpm_chip *chip = to_tpm_chip(dev);
220 struct tpm1_version *version;
225 if (tpm_try_get_ops(chip))
228 if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
229 "attempting to determine the manufacturer",
230 sizeof(cap.manufacturer_id)))
233 str += sprintf(str, "Manufacturer: 0x%x\n",
234 be32_to_cpu(cap.manufacturer_id));
237 if (!tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
238 "attempting to determine the 1.2 version",
239 sizeof(cap.version2))) {
240 version = &cap.version2.version;
245 if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
246 "attempting to determine the 1.1 version",
247 sizeof(cap.version1))) {
251 version = &cap.version1;
255 "TCG version: %d.%d\nFirmware version: %d.%d\n",
256 version->major, version->minor,
257 version->rev_major, version->rev_minor);
265 static DEVICE_ATTR_RO(caps);
267 static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
268 const char *buf, size_t count)
270 struct tpm_chip *chip = to_tpm_chip(dev);
272 if (tpm_try_get_ops(chip))
275 chip->ops->cancel(chip);
279 static DEVICE_ATTR_WO(cancel);
281 static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
284 struct tpm_chip *chip = to_tpm_chip(dev);
286 if (chip->duration[TPM_LONG] == 0)
289 return sprintf(buf, "%d %d %d [%s]\n",
290 jiffies_to_usecs(chip->duration[TPM_SHORT]),
291 jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
292 jiffies_to_usecs(chip->duration[TPM_LONG]),
293 chip->duration_adjusted
294 ? "adjusted" : "original");
296 static DEVICE_ATTR_RO(durations);
298 static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
301 struct tpm_chip *chip = to_tpm_chip(dev);
303 return sprintf(buf, "%d %d %d %d [%s]\n",
304 jiffies_to_usecs(chip->timeout_a),
305 jiffies_to_usecs(chip->timeout_b),
306 jiffies_to_usecs(chip->timeout_c),
307 jiffies_to_usecs(chip->timeout_d),
308 chip->timeout_adjusted
309 ? "adjusted" : "original");
311 static DEVICE_ATTR_RO(timeouts);
313 static struct attribute *tpm_dev_attrs[] = {
314 &dev_attr_pubek.attr,
316 &dev_attr_enabled.attr,
317 &dev_attr_active.attr,
318 &dev_attr_owned.attr,
319 &dev_attr_temp_deactivated.attr,
321 &dev_attr_cancel.attr,
322 &dev_attr_durations.attr,
323 &dev_attr_timeouts.attr,
327 static const struct attribute_group tpm_dev_group = {
328 .attrs = tpm_dev_attrs,
331 void tpm_sysfs_add_device(struct tpm_chip *chip)
333 if (chip->flags & TPM_CHIP_FLAG_TPM2)
336 WARN_ON(chip->groups_cnt != 0);
337 chip->groups[chip->groups_cnt++] = &tpm_dev_group;