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/version.h>
23 #include <linux/pci.h>
24 #include <linux/delay.h>
26 #include <linux/miscdevice.h>
27 #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 {
54 u16 base; /* TPM base address */
56 int (*recv) (struct tpm_chip *, u8 *, size_t);
57 int (*send) (struct tpm_chip *, u8 *, size_t);
58 void (*cancel) (struct tpm_chip *);
59 u8 (*status) (struct tpm_chip *);
60 struct miscdevice miscdev;
61 struct attribute_group *attr_group;
65 struct device *dev; /* Device stuff */
67 int dev_num; /* /dev/tpm# */
68 int num_opens; /* only one allowed */
71 /* Data passed to and from the tpm via the read/write calls */
73 atomic_t data_pending;
74 struct semaphore buffer_mutex;
76 struct timer_list user_read_timer; /* user needs to claim result */
77 struct semaphore tpm_mutex; /* tpm is processing */
79 struct tpm_vendor_specific *vendor;
81 struct list_head list;
84 static inline int tpm_read_index(int base, int index)
87 return inb(base+1) & 0xFF;
90 static inline void tpm_write_index(int base, int index, int value)
93 outb(value & 0xFF, base+1);
96 extern int tpm_register_hardware(struct device *,
97 struct tpm_vendor_specific *);
98 extern int tpm_open(struct inode *, struct file *);
99 extern int tpm_release(struct inode *, struct file *);
100 extern ssize_t tpm_write(struct file *, const char __user *, size_t,
102 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
103 extern void tpm_remove_hardware(struct device *);
104 extern int tpm_pm_suspend(struct device *, pm_message_t);
105 extern int tpm_pm_resume(struct device *);