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>
29 TPM_TIMEOUT = 5, /* msecs */
34 TPM_SUPERIO_ADDR = 0x2E,
38 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
40 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
42 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
44 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
45 const char *, size_t);
49 struct tpm_vendor_specific {
53 void __iomem *iobase; /* ioremapped address */
54 unsigned long base; /* TPM base address */
59 int (*recv) (struct tpm_chip *, u8 *, size_t);
60 int (*send) (struct tpm_chip *, u8 *, size_t);
61 void (*cancel) (struct tpm_chip *);
62 u8 (*status) (struct tpm_chip *);
63 struct miscdevice miscdev;
64 struct attribute_group *attr_group;
68 struct device *dev; /* Device stuff */
70 int dev_num; /* /dev/tpm# */
71 int num_opens; /* only one allowed */
74 /* Data passed to and from the tpm via the read/write calls */
76 atomic_t data_pending;
77 struct semaphore buffer_mutex;
79 struct timer_list user_read_timer; /* user needs to claim result */
80 struct work_struct work;
81 struct semaphore tpm_mutex; /* tpm is processing */
83 struct tpm_vendor_specific *vendor;
85 struct dentry **bios_dir;
87 struct list_head list;
90 static inline int tpm_read_index(int base, int index)
93 return inb(base+1) & 0xFF;
96 static inline void tpm_write_index(int base, int index, int value)
99 outb(value & 0xFF, base+1);
102 extern int tpm_register_hardware(struct device *,
103 struct tpm_vendor_specific *);
104 extern int tpm_open(struct inode *, struct file *);
105 extern int tpm_release(struct inode *, struct file *);
106 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
108 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
109 extern void tpm_remove_hardware(struct device *);
110 extern int tpm_pm_suspend(struct device *, pm_message_t);
111 extern int tpm_pm_resume(struct device *);
114 extern struct dentry ** tpm_bios_log_setup(char *);
115 extern void tpm_bios_log_teardown(struct dentry **);
117 static inline struct dentry* tpm_bios_log_setup(char *name)
121 static inline void tpm_bios_log_teardown(struct dentry **dir)