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_TIMEOUT = 5, /* msecs */
37 TPM_SUPERIO_ADDR = 0x2E,
41 #define TPM_WARN_DOING_SELFTEST 0x802
42 #define TPM_ERR_DEACTIVATED 0x6
43 #define TPM_ERR_DISABLED 0x7
45 #define TPM_HEADER_SIZE 10
46 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
48 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
50 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
52 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
54 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
55 const char *, size_t);
56 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
58 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
60 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
62 extern ssize_t tpm_show_temp_deactivated(struct device *,
63 struct device_attribute *attr, char *);
64 extern ssize_t tpm_show_durations(struct device *,
65 struct device_attribute *attr, char *);
66 extern ssize_t tpm_show_timeouts(struct device *,
67 struct device_attribute *attr, char *);
71 struct tpm_vendor_specific {
72 const u8 req_complete_mask;
73 const u8 req_complete_val;
74 const u8 req_canceled;
75 void __iomem *iobase; /* ioremapped address */
76 unsigned long base; /* TPM base address */
84 int (*recv) (struct tpm_chip *, u8 *, size_t);
85 int (*send) (struct tpm_chip *, u8 *, size_t);
86 void (*cancel) (struct tpm_chip *);
87 u8 (*status) (struct tpm_chip *);
88 void (*release) (struct device *);
89 struct miscdevice miscdev;
90 struct attribute_group *attr_group;
91 struct list_head list;
93 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
94 bool timeout_adjusted;
95 unsigned long duration[3]; /* jiffies */
96 bool duration_adjusted;
98 wait_queue_head_t read_queue;
99 wait_queue_head_t int_queue;
103 struct device *dev; /* Device stuff */
105 int dev_num; /* /dev/tpm# */
106 unsigned long is_open; /* only one allowed */
109 /* Data passed to and from the tpm via the read/write calls */
111 atomic_t data_pending;
112 struct mutex buffer_mutex;
114 struct timer_list user_read_timer; /* user needs to claim result */
115 struct work_struct work;
116 struct mutex tpm_mutex; /* tpm is processing */
118 struct tpm_vendor_specific vendor;
120 struct dentry **bios_dir;
122 struct list_head list;
126 void (*release) (struct device *);
129 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
131 static inline void tpm_chip_put(struct tpm_chip *chip)
133 module_put(chip->dev->driver->owner);
136 static inline int tpm_read_index(int base, int index)
139 return inb(base+1) & 0xFF;
142 static inline void tpm_write_index(int base, int index, int value)
145 outb(value & 0xFF, base+1);
147 struct tpm_input_header {
151 }__attribute__((packed));
153 struct tpm_output_header {
157 }__attribute__((packed));
159 struct stclear_flags_t {
162 u8 disableForceClear;
164 u8 physicalPresenceLock;
166 }__attribute__((packed));
168 struct tpm_version_t {
173 }__attribute__((packed));
175 struct tpm_version_1_2_t {
181 }__attribute__((packed));
188 }__attribute__((packed));
194 }__attribute__((packed));
196 struct permanent_flags_t {
202 u8 disableOwnerClear;
204 u8 physicalPresenceLifetimeLock;
205 u8 physicalPresenceHWEnable;
206 u8 physicalPresenceCMDEnable;
217 u8 disableFullDALogicInfo;
218 }__attribute__((packed));
221 struct permanent_flags_t perm_flags;
222 struct stclear_flags_t stclear_flags;
225 struct tpm_version_t tpm_version;
226 struct tpm_version_1_2_t tpm_version_1_2;
227 __be32 manufacturer_id;
228 struct timeout_t timeout;
229 struct duration_t duration;
232 struct tpm_getcap_params_in {
236 }__attribute__((packed));
238 struct tpm_getcap_params_out {
241 }__attribute__((packed));
243 struct tpm_readpubek_params_out {
248 u8 parameters[12]; /*assuming RSA*/
252 }__attribute__((packed));
255 struct tpm_input_header in;
256 struct tpm_output_header out;
259 #define TPM_DIGEST_SIZE 20
260 struct tpm_pcrread_out {
261 u8 pcr_result[TPM_DIGEST_SIZE];
262 }__attribute__((packed));
264 struct tpm_pcrread_in {
266 }__attribute__((packed));
268 struct tpm_pcrextend_in {
270 u8 hash[TPM_DIGEST_SIZE];
271 }__attribute__((packed));
274 struct tpm_getcap_params_out getcap_out;
275 struct tpm_readpubek_params_out readpubek_out;
276 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
277 struct tpm_getcap_params_in getcap_in;
278 struct tpm_pcrread_in pcrread_in;
279 struct tpm_pcrread_out pcrread_out;
280 struct tpm_pcrextend_in pcrextend_in;
284 tpm_cmd_header header;
285 tpm_cmd_params params;
286 }__attribute__((packed));
288 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
291 static inline void *chip_get_private(const struct tpm_chip *chip)
296 static inline void chip_set_private(struct tpm_chip *chip, void *priv)
302 extern int tpm_get_timeouts(struct tpm_chip *);
303 extern void tpm_gen_interrupt(struct tpm_chip *);
304 extern int tpm_do_selftest(struct tpm_chip *);
305 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
306 extern struct tpm_chip* tpm_register_hardware(struct device *,
307 const struct tpm_vendor_specific *);
308 extern int tpm_open(struct inode *, struct file *);
309 extern int tpm_release(struct inode *, struct file *);
310 extern void tpm_dev_vendor_release(struct tpm_chip *);
311 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
313 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
314 extern void tpm_remove_hardware(struct device *);
315 extern int tpm_pm_suspend(struct device *, pm_message_t);
316 extern int tpm_pm_resume(struct device *);
317 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
318 wait_queue_head_t *);
320 extern struct dentry ** tpm_bios_log_setup(char *);
321 extern void tpm_bios_log_teardown(struct dentry **);
323 static inline struct dentry ** tpm_bios_log_setup(char *name)
327 static inline void tpm_bios_log_teardown(struct dentry **dir)