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 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
43 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
45 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
47 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
49 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
50 const char *, size_t);
51 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
53 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
55 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
57 extern ssize_t tpm_show_temp_deactivated(struct device *,
58 struct device_attribute *attr, char *);
59 extern ssize_t tpm_show_durations(struct device *,
60 struct device_attribute *attr, char *);
61 extern ssize_t tpm_show_timeouts(struct device *,
62 struct device_attribute *attr, char *);
66 struct tpm_vendor_specific {
67 const u8 req_complete_mask;
68 const u8 req_complete_val;
69 const u8 req_canceled;
70 void __iomem *iobase; /* ioremapped address */
71 unsigned long base; /* TPM base address */
79 int (*recv) (struct tpm_chip *, u8 *, size_t);
80 int (*send) (struct tpm_chip *, u8 *, size_t);
81 void (*cancel) (struct tpm_chip *);
82 u8 (*status) (struct tpm_chip *);
83 bool (*update_timeouts)(struct tpm_chip *chip,
84 unsigned long *timeout_cap);
86 void (*release) (struct device *);
87 struct miscdevice miscdev;
88 struct attribute_group *attr_group;
89 struct list_head list;
91 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
92 bool timeout_adjusted;
93 unsigned long duration[3]; /* jiffies */
94 bool duration_adjusted;
96 wait_queue_head_t read_queue;
97 wait_queue_head_t int_queue;
101 struct device *dev; /* Device stuff */
103 int dev_num; /* /dev/tpm# */
104 unsigned long is_open; /* only one allowed */
107 /* Data passed to and from the tpm via the read/write calls */
109 atomic_t data_pending;
110 struct mutex buffer_mutex;
112 struct timer_list user_read_timer; /* user needs to claim result */
113 struct work_struct work;
114 struct mutex tpm_mutex; /* tpm is processing */
116 struct tpm_vendor_specific vendor;
118 struct dentry **bios_dir;
120 struct list_head list;
121 void (*release) (struct device *);
124 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
126 static inline void tpm_chip_put(struct tpm_chip *chip)
128 module_put(chip->dev->driver->owner);
131 static inline int tpm_read_index(int base, int index)
134 return inb(base+1) & 0xFF;
137 static inline void tpm_write_index(int base, int index, int value)
140 outb(value & 0xFF, base+1);
142 struct tpm_input_header {
146 }__attribute__((packed));
148 struct tpm_output_header {
152 }__attribute__((packed));
154 struct stclear_flags_t {
157 u8 disableForceClear;
159 u8 physicalPresenceLock;
161 }__attribute__((packed));
163 struct tpm_version_t {
168 }__attribute__((packed));
170 struct tpm_version_1_2_t {
176 }__attribute__((packed));
183 }__attribute__((packed));
189 }__attribute__((packed));
191 struct permanent_flags_t {
197 u8 disableOwnerClear;
199 u8 physicalPresenceLifetimeLock;
200 u8 physicalPresenceHWEnable;
201 u8 physicalPresenceCMDEnable;
212 u8 disableFullDALogicInfo;
213 }__attribute__((packed));
216 struct permanent_flags_t perm_flags;
217 struct stclear_flags_t stclear_flags;
220 struct tpm_version_t tpm_version;
221 struct tpm_version_1_2_t tpm_version_1_2;
222 __be32 manufacturer_id;
223 struct timeout_t timeout;
224 struct duration_t duration;
227 struct tpm_getcap_params_in {
231 }__attribute__((packed));
233 struct tpm_getcap_params_out {
236 }__attribute__((packed));
238 struct tpm_readpubek_params_out {
243 u8 parameters[12]; /*assuming RSA*/
247 }__attribute__((packed));
250 struct tpm_input_header in;
251 struct tpm_output_header out;
254 #define TPM_DIGEST_SIZE 20
255 struct tpm_pcrread_out {
256 u8 pcr_result[TPM_DIGEST_SIZE];
257 }__attribute__((packed));
259 struct tpm_pcrread_in {
261 }__attribute__((packed));
263 struct tpm_pcrextend_in {
265 u8 hash[TPM_DIGEST_SIZE];
266 }__attribute__((packed));
269 struct tpm_getcap_params_out getcap_out;
270 struct tpm_readpubek_params_out readpubek_out;
271 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
272 struct tpm_getcap_params_in getcap_in;
273 struct tpm_pcrread_in pcrread_in;
274 struct tpm_pcrread_out pcrread_out;
275 struct tpm_pcrextend_in pcrextend_in;
279 tpm_cmd_header header;
280 tpm_cmd_params params;
281 }__attribute__((packed));
283 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
285 extern void tpm_get_timeouts(struct tpm_chip *);
286 extern void tpm_gen_interrupt(struct tpm_chip *);
287 extern void tpm_continue_selftest(struct tpm_chip *);
288 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
289 extern struct tpm_chip* tpm_register_hardware(struct device *,
290 const struct tpm_vendor_specific *);
291 extern int tpm_open(struct inode *, struct file *);
292 extern int tpm_release(struct inode *, struct file *);
293 extern void tpm_dev_vendor_release(struct tpm_chip *);
294 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
296 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
297 extern void tpm_remove_hardware(struct device *);
298 extern int tpm_pm_suspend(struct device *, pm_message_t);
299 extern int tpm_pm_resume(struct device *);
302 extern struct dentry ** tpm_bios_log_setup(char *);
303 extern void tpm_bios_log_teardown(struct dentry **);
305 static inline struct dentry ** tpm_bios_log_setup(char *name)
309 static inline void tpm_bios_log_teardown(struct dentry **dir)