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/pci.h>
23 #include <linux/delay.h>
25 #include <linux/miscdevice.h>
26 #include <linux/platform_device.h>
30 TPM_TIMEOUT = 5, /* msecs */
35 TPM_SUPERIO_ADDR = 0x2E,
39 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
41 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
43 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
45 extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
47 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
48 const char *, size_t);
49 extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
51 extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
53 extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
55 extern ssize_t tpm_show_temp_deactivated(struct device *,
56 struct device_attribute *attr, char *);
60 struct tpm_vendor_specific {
61 const u8 req_complete_mask;
62 const u8 req_complete_val;
63 const u8 req_canceled;
64 void __iomem *iobase; /* ioremapped address */
65 unsigned long base; /* TPM base address */
70 int (*recv) (struct tpm_chip *, u8 *, size_t);
71 int (*send) (struct tpm_chip *, u8 *, size_t);
72 void (*cancel) (struct tpm_chip *);
73 u8 (*status) (struct tpm_chip *);
74 struct miscdevice miscdev;
75 struct attribute_group *attr_group;
76 u32 timeout_a, timeout_b, timeout_c, timeout_d;
81 struct device *dev; /* Device stuff */
83 int dev_num; /* /dev/tpm# */
84 int num_opens; /* only one allowed */
87 /* Data passed to and from the tpm via the read/write calls */
89 atomic_t data_pending;
90 struct semaphore buffer_mutex;
92 struct timer_list user_read_timer; /* user needs to claim result */
93 struct work_struct work;
94 struct semaphore tpm_mutex; /* tpm is processing */
96 struct tpm_vendor_specific vendor;
98 struct dentry **bios_dir;
100 struct list_head list;
103 static inline int tpm_read_index(int base, int index)
106 return inb(base+1) & 0xFF;
109 static inline void tpm_write_index(int base, int index, int value)
112 outb(value & 0xFF, base+1);
115 extern void tpm_get_timeouts(struct tpm_chip *);
116 extern void tpm_gen_interrupt(struct tpm_chip *);
117 extern void tpm_continue_selftest(struct tpm_chip *);
118 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
119 extern struct tpm_chip* tpm_register_hardware(struct device *,
120 const struct tpm_vendor_specific *);
121 extern int tpm_open(struct inode *, struct file *);
122 extern int tpm_release(struct inode *, struct file *);
123 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
125 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
126 extern void tpm_remove_hardware(struct device *);
127 extern int tpm_pm_suspend(struct device *, pm_message_t);
128 extern int tpm_pm_resume(struct device *);
131 extern struct dentry ** tpm_bios_log_setup(char *);
132 extern void tpm_bios_log_teardown(struct dentry **);
134 static inline struct dentry* tpm_bios_log_setup(char *name)
138 static inline void tpm_bios_log_teardown(struct dentry **dir)