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
50 #define TPM_ERR_INVALID_POSTINIT 38
52 #define TPM_HEADER_SIZE 10
53 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
55 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
57 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
59 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
61 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
62 const char *, size_t);
63 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
65 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
67 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
69 extern ssize_t tpm_show_temp_deactivated(struct device *,
70 struct device_attribute *attr, char *);
71 extern ssize_t tpm_show_durations(struct device *,
72 struct device_attribute *attr, char *);
73 extern ssize_t tpm_show_timeouts(struct device *,
74 struct device_attribute *attr, char *);
78 struct tpm_vendor_specific {
79 const u8 req_complete_mask;
80 const u8 req_complete_val;
81 const u8 req_canceled;
82 void __iomem *iobase; /* ioremapped address */
83 unsigned long base; /* TPM base address */
91 int (*recv) (struct tpm_chip *, u8 *, size_t);
92 int (*send) (struct tpm_chip *, u8 *, size_t);
93 void (*cancel) (struct tpm_chip *);
94 u8 (*status) (struct tpm_chip *);
95 void (*release) (struct device *);
96 struct miscdevice miscdev;
97 struct attribute_group *attr_group;
98 struct list_head list;
100 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
101 bool timeout_adjusted;
102 unsigned long duration[3]; /* jiffies */
103 bool duration_adjusted;
106 wait_queue_head_t read_queue;
107 wait_queue_head_t int_queue;
110 #define TPM_VID_INTEL 0x8086
113 struct device *dev; /* Device stuff */
115 int dev_num; /* /dev/tpm# */
116 unsigned long is_open; /* only one allowed */
119 /* Data passed to and from the tpm via the read/write calls */
121 atomic_t data_pending;
122 struct mutex buffer_mutex;
124 struct timer_list user_read_timer; /* user needs to claim result */
125 struct work_struct work;
126 struct mutex tpm_mutex; /* tpm is processing */
128 struct tpm_vendor_specific vendor;
130 struct dentry **bios_dir;
132 struct list_head list;
133 void (*release) (struct device *);
136 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
138 static inline void tpm_chip_put(struct tpm_chip *chip)
140 module_put(chip->dev->driver->owner);
143 static inline int tpm_read_index(int base, int index)
146 return inb(base+1) & 0xFF;
149 static inline void tpm_write_index(int base, int index, int value)
152 outb(value & 0xFF, base+1);
154 struct tpm_input_header {
158 }__attribute__((packed));
160 struct tpm_output_header {
164 }__attribute__((packed));
166 struct stclear_flags_t {
169 u8 disableForceClear;
171 u8 physicalPresenceLock;
173 }__attribute__((packed));
175 struct tpm_version_t {
180 }__attribute__((packed));
182 struct tpm_version_1_2_t {
188 }__attribute__((packed));
195 }__attribute__((packed));
201 }__attribute__((packed));
203 struct permanent_flags_t {
209 u8 disableOwnerClear;
211 u8 physicalPresenceLifetimeLock;
212 u8 physicalPresenceHWEnable;
213 u8 physicalPresenceCMDEnable;
224 u8 disableFullDALogicInfo;
225 }__attribute__((packed));
228 struct permanent_flags_t perm_flags;
229 struct stclear_flags_t stclear_flags;
232 struct tpm_version_t tpm_version;
233 struct tpm_version_1_2_t tpm_version_1_2;
234 __be32 manufacturer_id;
235 struct timeout_t timeout;
236 struct duration_t duration;
239 struct tpm_getcap_params_in {
243 }__attribute__((packed));
245 struct tpm_getcap_params_out {
248 }__attribute__((packed));
250 struct tpm_readpubek_params_out {
255 u8 parameters[12]; /*assuming RSA*/
259 }__attribute__((packed));
262 struct tpm_input_header in;
263 struct tpm_output_header out;
266 #define TPM_DIGEST_SIZE 20
267 struct tpm_pcrread_out {
268 u8 pcr_result[TPM_DIGEST_SIZE];
269 }__attribute__((packed));
271 struct tpm_pcrread_in {
273 }__attribute__((packed));
275 struct tpm_pcrextend_in {
277 u8 hash[TPM_DIGEST_SIZE];
278 }__attribute__((packed));
280 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
281 * bytes, but 128 is still a relatively large number of random bytes and
282 * anything much bigger causes users of struct tpm_cmd_t to start getting
283 * compiler warnings about stack frame size. */
284 #define TPM_MAX_RNG_DATA 128
286 struct tpm_getrandom_out {
288 u8 rng_data[TPM_MAX_RNG_DATA];
289 }__attribute__((packed));
291 struct tpm_getrandom_in {
293 }__attribute__((packed));
295 struct tpm_startup_in {
300 struct tpm_getcap_params_out getcap_out;
301 struct tpm_readpubek_params_out readpubek_out;
302 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
303 struct tpm_getcap_params_in getcap_in;
304 struct tpm_pcrread_in pcrread_in;
305 struct tpm_pcrread_out pcrread_out;
306 struct tpm_pcrextend_in pcrextend_in;
307 struct tpm_getrandom_in getrandom_in;
308 struct tpm_getrandom_out getrandom_out;
309 struct tpm_startup_in startup_in;
313 tpm_cmd_header header;
314 tpm_cmd_params params;
315 }__attribute__((packed));
317 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
319 extern int tpm_get_timeouts(struct tpm_chip *);
320 extern void tpm_gen_interrupt(struct tpm_chip *);
321 extern int tpm_do_selftest(struct tpm_chip *);
322 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
323 extern struct tpm_chip* tpm_register_hardware(struct device *,
324 const struct tpm_vendor_specific *);
325 extern int tpm_open(struct inode *, struct file *);
326 extern int tpm_release(struct inode *, struct file *);
327 extern void tpm_dev_vendor_release(struct tpm_chip *);
328 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
330 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
331 extern void tpm_remove_hardware(struct device *);
332 extern int tpm_pm_suspend(struct device *);
333 extern int tpm_pm_resume(struct device *);
334 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
335 wait_queue_head_t *);
338 extern int tpm_add_ppi(struct kobject *);
339 extern void tpm_remove_ppi(struct kobject *);
341 static inline int tpm_add_ppi(struct kobject *parent)
346 static inline void tpm_remove_ppi(struct kobject *parent)