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 void (*release) (struct device *);
84 struct miscdevice miscdev;
85 struct attribute_group *attr_group;
86 struct list_head list;
88 unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
89 bool timeout_adjusted;
90 unsigned long duration[3]; /* jiffies */
91 bool duration_adjusted;
93 wait_queue_head_t read_queue;
94 wait_queue_head_t int_queue;
98 struct device *dev; /* Device stuff */
100 int dev_num; /* /dev/tpm# */
101 unsigned long is_open; /* only one allowed */
104 /* Data passed to and from the tpm via the read/write calls */
106 atomic_t data_pending;
107 struct mutex buffer_mutex;
109 struct timer_list user_read_timer; /* user needs to claim result */
110 struct work_struct work;
111 struct mutex tpm_mutex; /* tpm is processing */
113 struct tpm_vendor_specific vendor;
115 struct dentry **bios_dir;
117 struct list_head list;
118 void (*release) (struct device *);
121 #define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
123 static inline void tpm_chip_put(struct tpm_chip *chip)
125 module_put(chip->dev->driver->owner);
128 static inline int tpm_read_index(int base, int index)
131 return inb(base+1) & 0xFF;
134 static inline void tpm_write_index(int base, int index, int value)
137 outb(value & 0xFF, base+1);
139 struct tpm_input_header {
143 }__attribute__((packed));
145 struct tpm_output_header {
149 }__attribute__((packed));
151 struct stclear_flags_t {
154 u8 disableForceClear;
156 u8 physicalPresenceLock;
158 }__attribute__((packed));
160 struct tpm_version_t {
165 }__attribute__((packed));
167 struct tpm_version_1_2_t {
173 }__attribute__((packed));
180 }__attribute__((packed));
186 }__attribute__((packed));
188 struct permanent_flags_t {
194 u8 disableOwnerClear;
196 u8 physicalPresenceLifetimeLock;
197 u8 physicalPresenceHWEnable;
198 u8 physicalPresenceCMDEnable;
209 u8 disableFullDALogicInfo;
210 }__attribute__((packed));
213 struct permanent_flags_t perm_flags;
214 struct stclear_flags_t stclear_flags;
217 struct tpm_version_t tpm_version;
218 struct tpm_version_1_2_t tpm_version_1_2;
219 __be32 manufacturer_id;
220 struct timeout_t timeout;
221 struct duration_t duration;
224 struct tpm_getcap_params_in {
228 }__attribute__((packed));
230 struct tpm_getcap_params_out {
233 }__attribute__((packed));
235 struct tpm_readpubek_params_out {
240 u8 parameters[12]; /*assuming RSA*/
244 }__attribute__((packed));
247 struct tpm_input_header in;
248 struct tpm_output_header out;
251 #define TPM_DIGEST_SIZE 20
252 struct tpm_pcrread_out {
253 u8 pcr_result[TPM_DIGEST_SIZE];
254 }__attribute__((packed));
256 struct tpm_pcrread_in {
258 }__attribute__((packed));
260 struct tpm_pcrextend_in {
262 u8 hash[TPM_DIGEST_SIZE];
263 }__attribute__((packed));
266 struct tpm_getcap_params_out getcap_out;
267 struct tpm_readpubek_params_out readpubek_out;
268 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
269 struct tpm_getcap_params_in getcap_in;
270 struct tpm_pcrread_in pcrread_in;
271 struct tpm_pcrread_out pcrread_out;
272 struct tpm_pcrextend_in pcrextend_in;
276 tpm_cmd_header header;
277 tpm_cmd_params params;
278 }__attribute__((packed));
280 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
282 extern void tpm_get_timeouts(struct tpm_chip *);
283 extern void tpm_gen_interrupt(struct tpm_chip *);
284 extern void tpm_continue_selftest(struct tpm_chip *);
285 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
286 extern struct tpm_chip* tpm_register_hardware(struct device *,
287 const struct tpm_vendor_specific *);
288 extern int tpm_open(struct inode *, struct file *);
289 extern int tpm_release(struct inode *, struct file *);
290 extern void tpm_dev_vendor_release(struct tpm_chip *);
291 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
293 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
294 extern void tpm_remove_hardware(struct device *);
295 extern int tpm_pm_suspend(struct device *, pm_message_t);
296 extern int tpm_pm_resume(struct device *);
299 extern struct dentry ** tpm_bios_log_setup(char *);
300 extern void tpm_bios_log_teardown(struct dentry **);
302 static inline struct dentry ** tpm_bios_log_setup(char *name)
306 static inline void tpm_bios_log_teardown(struct dentry **dir)