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/*
* Copyright (C) 2004 IBM Corporation
*
* Authors:
* Leendert van Doorn <leendert@watson.ibm.com>
* Dave Safford <safford@watson.ibm.com>
* Reiner Sailer <sailer@watson.ibm.com>
* Kylene Hall <kjhall@us.ibm.com>
*
* Maintained by: <tpmdd_devel@lists.sourceforge.net>
*
* Device driver for TCG/TCPA TPM (trusted platform module).
* Specifications at www.trustedcomputinggroup.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
*/
#include <linux/module.h>
#include <linux/version.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/miscdevice.h>
enum {
TPM_TIMEOUT = 5, /* msecs */
TPM_NUM_ATTR = 4
};
/* TPM addresses */
enum {
TPM_ADDR = 0x4E,
TPM_DATA = 0x4F
};
/*
* Chip num is this value or a valid tpm idx in lower two bytes of chip_id
*/
enum tpm_chip_num {
TPM_ANY_NUM = 0xFFFF,
};
#define TPM_CHIP_NUM_MASK 0x0000ffff
extern ssize_t tpm_show_pubek(struct device *, char *);
extern ssize_t tpm_show_pcrs(struct device *, char *);
extern ssize_t tpm_show_caps(struct device *, char *);
extern ssize_t tpm_store_cancel(struct device *, const char *, size_t);
#define TPM_DEVICE_ATTRS { \
__ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL), \
__ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL), \
__ATTR(caps, S_IRUGO, tpm_show_caps, NULL), \
__ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel) }
struct tpm_chip;
struct tpm_vendor_specific {
u8 req_complete_mask;
u8 req_complete_val;
u8 req_canceled;
u16 base; /* TPM base address */
u32 buffersize; /* The device's requested buffersize */
int (*recv) (struct tpm_chip *, u8 *, size_t);
int (*send) (struct tpm_chip *, u8 *, size_t);
void (*cancel) (struct tpm_chip *);
u8(*status) (struct tpm_chip *);
struct miscdevice miscdev;
struct device_attribute attr[TPM_NUM_ATTR];
};
struct tpm_chip {
struct device *dev; /* PCI device stuff */
int dev_num; /* /dev/tpm# */
int num_opens; /* only one allowed */
int time_expired;
/* Data passed to and from the tpm via the read/write calls */
u8 *data_buffer;
atomic_t data_pending;
atomic_t data_position;
struct semaphore buffer_mutex;
struct timer_list user_read_timer; /* user needs to claim result */
struct semaphore tpm_mutex; /* tpm is processing */
struct tpm_vendor_specific *vendor;
struct list_head list;
};
static inline int tpm_read_index(int index)
{
outb(index, TPM_ADDR);
return inb(TPM_DATA) & 0xFF;
}
static inline void tpm_write_index(int index, int value)
{
outb(index, TPM_ADDR);
outb(value & 0xFF, TPM_DATA);
}
extern void tpm_time_expired(unsigned long);
extern int tpm_lpc_bus_init(struct pci_dev *, u16);
extern int tpm_register_hardware_nopci(struct device *,
struct tpm_vendor_specific *);
extern void tpm_remove_hardware(struct device *);
extern int tpm_open(struct inode *, struct file *);
extern int tpm_release(struct inode *, struct file *);
extern ssize_t tpm_write(struct file *, const char __user *, size_t,
loff_t *);
extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
extern int tpm_pcr_extend(u32 chip_id, int pcr_idx, const u8* hash);
extern int tpm_pcr_read( u32 chip_id, int pcr_idx, u8* res_buf, int res_buf_size );
extern int tpm_pm_suspend(struct pci_dev *, u32);
extern int tpm_pm_resume(struct pci_dev *);
/* internal kernel interface */
extern ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
size_t bufsiz);
extern struct tpm_chip *tpm_chip_lookup(int chip_num);
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