2 * 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 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
12 * Device driver for TCG/TCPA TPM (trusted platform module).
13 * Specifications at www.trustedcomputinggroup.org
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation, version 2 of the
21 #include <linux/module.h>
22 #include <linux/delay.h>
24 #include <linux/mutex.h>
25 #include <linux/sched.h>
26 #include <linux/miscdevice.h>
27 #include <linux/platform_device.h>
29 #include <linux/tpm.h>
32 TPM_MINOR = 224, /* officially assigned */
34 TPM_NUM_DEVICES = 256,
38 TPM_TIMEOUT = 5, /* msecs */
43 TPM_SUPERIO_ADDR = 0x2E,
47 #define TPM_WARN_DOING_SELFTEST 0x802
48 #define TPM_ERR_DEACTIVATED 0x6
49 #define TPM_ERR_DISABLED 0x7
51 #define TPM_HEADER_SIZE 10
52 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
54 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
56 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
58 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
60 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
61 const char *, size_t);
62 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
64 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
66 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
68 extern ssize_t tpm_show_temp_deactivated(struct device *,
69 struct device_attribute *attr, char *);
70 extern ssize_t tpm_show_durations(struct device *,
71 struct device_attribute *attr, char *);
72 extern ssize_t tpm_show_timeouts(struct device *,
73 struct device_attribute *attr, char *);
77 struct tpm_vendor_specific {
78 const u8 req_complete_mask;
79 const u8 req_complete_val;
80 const u8 req_canceled;
81 void __iomem *iobase; /* ioremapped address */
82 unsigned long base; /* TPM base address */
90 int (*recv) (struct tpm_chip *, u8 *, size_t);
91 int (*send) (struct tpm_chip *, u8 *, size_t);
92 void (*cancel) (struct tpm_chip *);
93 u8 (*status) (struct tpm_chip *);
94 void (*release) (struct device *);
95 struct miscdevice miscdev;
96 struct attribute_group *attr_group;
97 struct list_head list;
99 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
100 bool timeout_adjusted;
101 unsigned long duration[3]; /* jiffies */
102 bool duration_adjusted;
105 wait_queue_head_t read_queue;
106 wait_queue_head_t int_queue;
109 #define TPM_VID_INTEL 0x8086
112 struct device *dev; /* Device stuff */
114 int dev_num; /* /dev/tpm# */
115 unsigned long is_open; /* only one allowed */
118 /* Data passed to and from the tpm via the read/write calls */
120 atomic_t data_pending;
121 struct mutex buffer_mutex;
123 struct timer_list user_read_timer; /* user needs to claim result */
124 struct work_struct work;
125 struct mutex tpm_mutex; /* tpm is processing */
127 struct tpm_vendor_specific vendor;
129 struct dentry **bios_dir;
131 struct list_head list;
132 void (*release) (struct device *);
135 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
137 static inline void tpm_chip_put(struct tpm_chip *chip)
139 module_put(chip->dev->driver->owner);
142 static inline int tpm_read_index(int base, int index)
145 return inb(base+1) & 0xFF;
148 static inline void tpm_write_index(int base, int index, int value)
151 outb(value & 0xFF, base+1);
153 struct tpm_input_header {
157 }__attribute__((packed));
159 struct tpm_output_header {
163 }__attribute__((packed));
165 struct stclear_flags_t {
168 u8 disableForceClear;
170 u8 physicalPresenceLock;
172 }__attribute__((packed));
174 struct tpm_version_t {
179 }__attribute__((packed));
181 struct tpm_version_1_2_t {
187 }__attribute__((packed));
194 }__attribute__((packed));
200 }__attribute__((packed));
202 struct permanent_flags_t {
208 u8 disableOwnerClear;
210 u8 physicalPresenceLifetimeLock;
211 u8 physicalPresenceHWEnable;
212 u8 physicalPresenceCMDEnable;
223 u8 disableFullDALogicInfo;
224 }__attribute__((packed));
227 struct permanent_flags_t perm_flags;
228 struct stclear_flags_t stclear_flags;
231 struct tpm_version_t tpm_version;
232 struct tpm_version_1_2_t tpm_version_1_2;
233 __be32 manufacturer_id;
234 struct timeout_t timeout;
235 struct duration_t duration;
238 struct tpm_getcap_params_in {
242 }__attribute__((packed));
244 struct tpm_getcap_params_out {
247 }__attribute__((packed));
249 struct tpm_readpubek_params_out {
254 u8 parameters[12]; /*assuming RSA*/
258 }__attribute__((packed));
261 struct tpm_input_header in;
262 struct tpm_output_header out;
265 #define TPM_DIGEST_SIZE 20
266 struct tpm_pcrread_out {
267 u8 pcr_result[TPM_DIGEST_SIZE];
268 }__attribute__((packed));
270 struct tpm_pcrread_in {
272 }__attribute__((packed));
274 struct tpm_pcrextend_in {
276 u8 hash[TPM_DIGEST_SIZE];
277 }__attribute__((packed));
279 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
280 * bytes, but 128 is still a relatively large number of random bytes and
281 * anything much bigger causes users of struct tpm_cmd_t to start getting
282 * compiler warnings about stack frame size. */
283 #define TPM_MAX_RNG_DATA 128
285 struct tpm_getrandom_out {
287 u8 rng_data[TPM_MAX_RNG_DATA];
288 }__attribute__((packed));
290 struct tpm_getrandom_in {
292 }__attribute__((packed));
295 struct tpm_getcap_params_out getcap_out;
296 struct tpm_readpubek_params_out readpubek_out;
297 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
298 struct tpm_getcap_params_in getcap_in;
299 struct tpm_pcrread_in pcrread_in;
300 struct tpm_pcrread_out pcrread_out;
301 struct tpm_pcrextend_in pcrextend_in;
302 struct tpm_getrandom_in getrandom_in;
303 struct tpm_getrandom_out getrandom_out;
307 tpm_cmd_header header;
308 tpm_cmd_params params;
309 }__attribute__((packed));
311 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
313 extern int tpm_get_timeouts(struct tpm_chip *);
314 extern void tpm_gen_interrupt(struct tpm_chip *);
315 extern int tpm_do_selftest(struct tpm_chip *);
316 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
317 extern struct tpm_chip* tpm_register_hardware(struct device *,
318 const struct tpm_vendor_specific *);
319 extern int tpm_open(struct inode *, struct file *);
320 extern int tpm_release(struct inode *, struct file *);
321 extern void tpm_dev_vendor_release(struct tpm_chip *);
322 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
324 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
325 extern void tpm_remove_hardware(struct device *);
326 extern int tpm_pm_suspend(struct device *);
327 extern int tpm_pm_resume(struct device *);
328 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
329 wait_queue_head_t *);
332 extern int tpm_add_ppi(struct kobject *);
333 extern void tpm_remove_ppi(struct kobject *);
335 static inline int tpm_add_ppi(struct kobject *parent)
340 static inline void tpm_remove_ppi(struct kobject *parent)