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 *);
64 struct tpm_vendor_specific {
65 const u8 req_complete_mask;
66 const u8 req_complete_val;
67 const u8 req_canceled;
68 void __iomem *iobase; /* ioremapped address */
69 unsigned long base; /* TPM base address */
76 int (*recv) (struct tpm_chip *, u8 *, size_t);
77 int (*send) (struct tpm_chip *, u8 *, size_t);
78 void (*cancel) (struct tpm_chip *);
79 u8 (*status) (struct tpm_chip *);
80 void (*release) (struct device *);
81 struct miscdevice miscdev;
82 struct attribute_group *attr_group;
83 struct list_head list;
85 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
86 unsigned long duration[3]; /* jiffies */
87 bool duration_adjusted;
89 wait_queue_head_t read_queue;
90 wait_queue_head_t int_queue;
94 struct device *dev; /* Device stuff */
96 int dev_num; /* /dev/tpm# */
97 unsigned long is_open; /* only one allowed */
100 /* Data passed to and from the tpm via the read/write calls */
102 atomic_t data_pending;
103 struct mutex buffer_mutex;
105 struct timer_list user_read_timer; /* user needs to claim result */
106 struct work_struct work;
107 struct mutex tpm_mutex; /* tpm is processing */
109 struct tpm_vendor_specific vendor;
111 struct dentry **bios_dir;
113 struct list_head list;
114 void (*release) (struct device *);
117 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
119 static inline void tpm_chip_put(struct tpm_chip *chip)
121 module_put(chip->dev->driver->owner);
124 static inline int tpm_read_index(int base, int index)
127 return inb(base+1) & 0xFF;
130 static inline void tpm_write_index(int base, int index, int value)
133 outb(value & 0xFF, base+1);
135 struct tpm_input_header {
139 }__attribute__((packed));
141 struct tpm_output_header {
145 }__attribute__((packed));
147 struct stclear_flags_t {
150 u8 disableForceClear;
152 u8 physicalPresenceLock;
154 }__attribute__((packed));
156 struct tpm_version_t {
161 }__attribute__((packed));
163 struct tpm_version_1_2_t {
169 }__attribute__((packed));
176 }__attribute__((packed));
182 }__attribute__((packed));
184 struct permanent_flags_t {
190 u8 disableOwnerClear;
192 u8 physicalPresenceLifetimeLock;
193 u8 physicalPresenceHWEnable;
194 u8 physicalPresenceCMDEnable;
205 u8 disableFullDALogicInfo;
206 }__attribute__((packed));
209 struct permanent_flags_t perm_flags;
210 struct stclear_flags_t stclear_flags;
213 struct tpm_version_t tpm_version;
214 struct tpm_version_1_2_t tpm_version_1_2;
215 __be32 manufacturer_id;
216 struct timeout_t timeout;
217 struct duration_t duration;
220 struct tpm_getcap_params_in {
224 }__attribute__((packed));
226 struct tpm_getcap_params_out {
229 }__attribute__((packed));
231 struct tpm_readpubek_params_out {
236 u8 parameters[12]; /*assuming RSA*/
240 }__attribute__((packed));
243 struct tpm_input_header in;
244 struct tpm_output_header out;
247 #define TPM_DIGEST_SIZE 20
248 struct tpm_pcrread_out {
249 u8 pcr_result[TPM_DIGEST_SIZE];
250 }__attribute__((packed));
252 struct tpm_pcrread_in {
254 }__attribute__((packed));
256 struct tpm_pcrextend_in {
258 u8 hash[TPM_DIGEST_SIZE];
259 }__attribute__((packed));
262 struct tpm_getcap_params_out getcap_out;
263 struct tpm_readpubek_params_out readpubek_out;
264 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
265 struct tpm_getcap_params_in getcap_in;
266 struct tpm_pcrread_in pcrread_in;
267 struct tpm_pcrread_out pcrread_out;
268 struct tpm_pcrextend_in pcrextend_in;
272 tpm_cmd_header header;
273 tpm_cmd_params params;
274 }__attribute__((packed));
276 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
278 extern void tpm_get_timeouts(struct tpm_chip *);
279 extern void tpm_gen_interrupt(struct tpm_chip *);
280 extern void tpm_continue_selftest(struct tpm_chip *);
281 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
282 extern struct tpm_chip* tpm_register_hardware(struct device *,
283 const struct tpm_vendor_specific *);
284 extern int tpm_open(struct inode *, struct file *);
285 extern int tpm_release(struct inode *, struct file *);
286 extern void tpm_dev_vendor_release(struct tpm_chip *);
287 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
289 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
290 extern void tpm_remove_hardware(struct device *);
291 extern int tpm_pm_suspend(struct device *, pm_message_t);
292 extern int tpm_pm_resume(struct device *);
295 extern struct dentry ** tpm_bios_log_setup(char *);
296 extern void tpm_bios_log_teardown(struct dentry **);
298 static inline struct dentry ** tpm_bios_log_setup(char *name)
302 static inline void tpm_bios_log_teardown(struct dentry **dir)