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 u16 base
; /* TPM base address */
55 int (*recv
) (struct tpm_chip
*, u8
*, size_t);
56 int (*send
) (struct tpm_chip
*, u8
*, size_t);
57 void (*cancel
) (struct tpm_chip
*);
58 u8 (*status
) (struct tpm_chip
*);
59 struct miscdevice miscdev
;
60 struct attribute_group
*attr_group
;
64 struct device
*dev
; /* Device stuff */
66 int dev_num
; /* /dev/tpm# */
67 int num_opens
; /* only one allowed */
70 /* Data passed to and from the tpm via the read/write calls */
72 atomic_t data_pending
;
73 struct semaphore buffer_mutex
;
75 struct timer_list user_read_timer
; /* user needs to claim result */
76 struct semaphore tpm_mutex
; /* tpm is processing */
78 struct tpm_vendor_specific
*vendor
;
80 struct list_head list
;
83 static inline int tpm_read_index(int base
, int index
)
86 return inb(base
+1) & 0xFF;
89 static inline void tpm_write_index(int base
, int index
, int value
)
92 outb(value
& 0xFF, base
+1);
95 extern int tpm_register_hardware(struct device
*,
96 struct tpm_vendor_specific
*);
97 extern int tpm_open(struct inode
*, struct file
*);
98 extern int tpm_release(struct inode
*, struct file
*);
99 extern ssize_t
tpm_write(struct file
*, const char __user
*, size_t,
101 extern ssize_t
tpm_read(struct file
*, char __user
*, size_t, loff_t
*);
102 extern void tpm_remove_hardware(struct device
*);
103 extern int tpm_pm_suspend(struct device
*, pm_message_t
);
104 extern int tpm_pm_resume(struct device
*);