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20#include <linux/device.h>
21#include "tpm.h"
22
23#define READ_PUBEK_RESULT_SIZE 314
24#define TPM_ORD_READPUBEK cpu_to_be32(124)
25static struct tpm_input_header tpm_readpubek_header = {
26 .tag = TPM_TAG_RQU_COMMAND,
27 .length = cpu_to_be32(30),
28 .ordinal = TPM_ORD_READPUBEK
29};
30static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
31 char *buf)
32{
33 u8 *data;
34 struct tpm_cmd_t tpm_cmd;
35 ssize_t err;
36 int i, rc;
37 char *str = buf;
38
39 struct tpm_chip *chip = dev_get_drvdata(dev);
40
41 tpm_cmd.header.in = tpm_readpubek_header;
42 err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
43 "attempting to read the PUBEK");
44 if (err)
45 goto out;
46
47
48
49
50
51
52
53
54
55
56
57 data = tpm_cmd.params.readpubek_out_buffer;
58 str +=
59 sprintf(str,
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"
67 "Modulus:\n",
68 data[0], data[1], data[2], data[3],
69 data[4], data[5],
70 data[6], data[7],
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))));
75
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");
80 }
81out:
82 rc = str - buf;
83 return rc;
84}
85static DEVICE_ATTR_RO(pubek);
86
87static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
88 char *buf)
89{
90 cap_t cap;
91 u8 digest[TPM_DIGEST_SIZE];
92 ssize_t rc;
93 int i, j, num_pcrs;
94 char *str = buf;
95 struct tpm_chip *chip = dev_get_drvdata(dev);
96
97 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
98 "attempting to determine the number of PCRS");
99 if (rc)
100 return 0;
101
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);
105 if (rc)
106 break;
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");
111 }
112 return str - buf;
113}
114static DEVICE_ATTR_RO(pcrs);
115
116static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118{
119 cap_t cap;
120 ssize_t rc;
121
122 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
123 "attempting to determine the permanent enabled state");
124 if (rc)
125 return 0;
126
127 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
128 return rc;
129}
130static DEVICE_ATTR_RO(enabled);
131
132static ssize_t active_show(struct device *dev, struct device_attribute *attr,
133 char *buf)
134{
135 cap_t cap;
136 ssize_t rc;
137
138 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
139 "attempting to determine the permanent active state");
140 if (rc)
141 return 0;
142
143 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
144 return rc;
145}
146static DEVICE_ATTR_RO(active);
147
148static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
149 char *buf)
150{
151 cap_t cap;
152 ssize_t rc;
153
154 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
155 "attempting to determine the owner state");
156 if (rc)
157 return 0;
158
159 rc = sprintf(buf, "%d\n", cap.owned);
160 return rc;
161}
162static DEVICE_ATTR_RO(owned);
163
164static ssize_t temp_deactivated_show(struct device *dev,
165 struct device_attribute *attr, char *buf)
166{
167 cap_t cap;
168 ssize_t rc;
169
170 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
171 "attempting to determine the temporary state");
172 if (rc)
173 return 0;
174
175 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
176 return rc;
177}
178static DEVICE_ATTR_RO(temp_deactivated);
179
180static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
181 char *buf)
182{
183 cap_t cap;
184 ssize_t rc;
185 char *str = buf;
186
187 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
188 "attempting to determine the manufacturer");
189 if (rc)
190 return 0;
191 str += sprintf(str, "Manufacturer: 0x%x\n",
192 be32_to_cpu(cap.manufacturer_id));
193
194
195 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
196 "attempting to determine the 1.2 version");
197 if (!rc) {
198 str += sprintf(str,
199 "TCG version: %d.%d\nFirmware version: %d.%d\n",
200 cap.tpm_version_1_2.Major,
201 cap.tpm_version_1_2.Minor,
202 cap.tpm_version_1_2.revMajor,
203 cap.tpm_version_1_2.revMinor);
204 } else {
205
206 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
207 "attempting to determine the 1.1 version");
208 if (rc)
209 return 0;
210 str += sprintf(str,
211 "TCG version: %d.%d\nFirmware version: %d.%d\n",
212 cap.tpm_version.Major,
213 cap.tpm_version.Minor,
214 cap.tpm_version.revMajor,
215 cap.tpm_version.revMinor);
216 }
217
218 return str - buf;
219}
220static DEVICE_ATTR_RO(caps);
221
222static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
223 const char *buf, size_t count)
224{
225 struct tpm_chip *chip = dev_get_drvdata(dev);
226 if (chip == NULL)
227 return 0;
228
229 chip->ops->cancel(chip);
230 return count;
231}
232static DEVICE_ATTR_WO(cancel);
233
234static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
235 char *buf)
236{
237 struct tpm_chip *chip = dev_get_drvdata(dev);
238
239 if (chip->vendor.duration[TPM_LONG] == 0)
240 return 0;
241
242 return sprintf(buf, "%d %d %d [%s]\n",
243 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
244 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
245 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
246 chip->vendor.duration_adjusted
247 ? "adjusted" : "original");
248}
249static DEVICE_ATTR_RO(durations);
250
251static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
252 char *buf)
253{
254 struct tpm_chip *chip = dev_get_drvdata(dev);
255
256 return sprintf(buf, "%d %d %d %d [%s]\n",
257 jiffies_to_usecs(chip->vendor.timeout_a),
258 jiffies_to_usecs(chip->vendor.timeout_b),
259 jiffies_to_usecs(chip->vendor.timeout_c),
260 jiffies_to_usecs(chip->vendor.timeout_d),
261 chip->vendor.timeout_adjusted
262 ? "adjusted" : "original");
263}
264static DEVICE_ATTR_RO(timeouts);
265
266static struct attribute *tpm_dev_attrs[] = {
267 &dev_attr_pubek.attr,
268 &dev_attr_pcrs.attr,
269 &dev_attr_enabled.attr,
270 &dev_attr_active.attr,
271 &dev_attr_owned.attr,
272 &dev_attr_temp_deactivated.attr,
273 &dev_attr_caps.attr,
274 &dev_attr_cancel.attr,
275 &dev_attr_durations.attr,
276 &dev_attr_timeouts.attr,
277 NULL,
278};
279
280static const struct attribute_group tpm_dev_group = {
281 .attrs = tpm_dev_attrs,
282};
283
284int tpm_sysfs_add_device(struct tpm_chip *chip)
285{
286 int err;
287 err = sysfs_create_group(&chip->pdev->kobj,
288 &tpm_dev_group);
289
290 if (err)
291 dev_err(chip->pdev,
292 "failed to create sysfs attributes, %d\n", err);
293 return err;
294}
295
296void tpm_sysfs_del_device(struct tpm_chip *chip)
297{
298 sysfs_remove_group(&chip->pdev->kobj, &tpm_dev_group);
299}
300
