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_store_cancel(struct device *, struct device_attribute *attr,
46 const char *, size_t);
50 struct tpm_vendor_specific {
51 const u8 req_complete_mask;
52 const u8 req_complete_val;
53 const u8 req_canceled;
54 void __iomem *iobase; /* ioremapped address */
55 unsigned long base; /* TPM base address */
60 int (*recv) (struct tpm_chip *, u8 *, size_t);
61 int (*send) (struct tpm_chip *, u8 *, size_t);
62 void (*cancel) (struct tpm_chip *);
63 u8 (*status) (struct tpm_chip *);
64 struct miscdevice miscdev;
65 struct attribute_group *attr_group;
70 struct device *dev; /* Device stuff */
72 int dev_num; /* /dev/tpm# */
73 int num_opens; /* only one allowed */
76 /* Data passed to and from the tpm via the read/write calls */
78 atomic_t data_pending;
79 struct semaphore buffer_mutex;
81 struct timer_list user_read_timer; /* user needs to claim result */
82 struct work_struct work;
83 struct semaphore tpm_mutex; /* tpm is processing */
85 struct tpm_vendor_specific vendor;
87 struct dentry **bios_dir;
89 struct list_head list;
92 static inline int tpm_read_index(int base, int index)
95 return inb(base+1) & 0xFF;
98 static inline void tpm_write_index(int base, int index, int value)
101 outb(value & 0xFF, base+1);
104 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
105 extern struct tpm_chip* tpm_register_hardware(struct device *,
106 const struct tpm_vendor_specific *);
107 extern int tpm_open(struct inode *, struct file *);
108 extern int tpm_release(struct inode *, struct file *);
109 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
111 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
112 extern void tpm_remove_hardware(struct device *);
113 extern int tpm_pm_suspend(struct device *, pm_message_t);
114 extern int tpm_pm_resume(struct device *);
117 extern struct dentry ** tpm_bios_log_setup(char *);
118 extern void tpm_bios_log_teardown(struct dentry **);
120 static inline struct dentry* tpm_bios_log_setup(char *name)
124 static inline void tpm_bios_log_teardown(struct dentry **dir)