tpm.h 4.4 KB
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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>
 *
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 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
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 *
 * 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/delay.h>
#include <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/miscdevice.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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enum tpm_timeout {
	TPM_TIMEOUT = 5,	/* msecs */
};
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/* TPM addresses */
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enum tpm_addr {
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	TPM_SUPERIO_ADDR = 0x2E,
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	TPM_ADDR = 0x4E,
};

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extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr,
				char *);
extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr,
				char *);
extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr,
				char *);
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extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
				char *);
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extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
				const char *, size_t);
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extern ssize_t tpm_show_enabled(struct device *, struct device_attribute *attr,
				char *);
extern ssize_t tpm_show_active(struct device *, struct device_attribute *attr,
				char *);
extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
				char *);
extern ssize_t tpm_show_temp_deactivated(struct device *,
					 struct device_attribute *attr, char *);
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struct tpm_chip;

struct tpm_vendor_specific {
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	const u8 req_complete_mask;
	const u8 req_complete_val;
	const u8 req_canceled;
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	void __iomem *iobase;		/* ioremapped address */
	unsigned long base;		/* TPM base address */

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	int irq;

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	int region_size;
	int have_region;
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	int (*recv) (struct tpm_chip *, u8 *, size_t);
	int (*send) (struct tpm_chip *, u8 *, size_t);
	void (*cancel) (struct tpm_chip *);
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	u8 (*status) (struct tpm_chip *);
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	void (*release) (struct device *);
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	struct miscdevice miscdev;
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	struct attribute_group *attr_group;
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	struct list_head list;
	int locality;
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	unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
	unsigned long duration[3]; /* jiffies */
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	wait_queue_head_t read_queue;
	wait_queue_head_t int_queue;
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};

struct tpm_chip {
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	struct device *dev;	/* Device stuff */
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	int dev_num;		/* /dev/tpm# */
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	unsigned long is_open;	/* only one allowed */
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	int time_expired;

	/* Data passed to and from the tpm via the read/write calls */
	u8 *data_buffer;
	atomic_t data_pending;
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	struct mutex buffer_mutex;
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	struct timer_list user_read_timer;	/* user needs to claim result */
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	struct work_struct work;
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	struct mutex tpm_mutex;	/* tpm is processing */
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	struct tpm_vendor_specific vendor;
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	struct dentry **bios_dir;

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	struct list_head list;
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	void (*release) (struct device *);
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};

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#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)

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static inline int tpm_read_index(int base, int index)
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{
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	outb(index, base);
	return inb(base+1) & 0xFF;
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}

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static inline void tpm_write_index(int base, int index, int value)
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{
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	outb(index, base);
	outb(value & 0xFF, base+1);
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}

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extern void tpm_get_timeouts(struct tpm_chip *);
extern void tpm_gen_interrupt(struct tpm_chip *);
extern void tpm_continue_selftest(struct tpm_chip *);
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extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
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extern struct tpm_chip* tpm_register_hardware(struct device *,
				 const struct tpm_vendor_specific *);
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extern int tpm_open(struct inode *, struct file *);
extern int tpm_release(struct inode *, struct file *);
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extern void tpm_dev_vendor_release(struct tpm_chip *);
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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 *);
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extern void tpm_remove_hardware(struct device *);
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extern int tpm_pm_suspend(struct device *, pm_message_t);
extern int tpm_pm_resume(struct device *);
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#ifdef CONFIG_ACPI
extern struct dentry ** tpm_bios_log_setup(char *);
extern void tpm_bios_log_teardown(struct dentry **);
#else
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static inline struct dentry ** tpm_bios_log_setup(char *name)
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{
	return NULL;
}
static inline void tpm_bios_log_teardown(struct dentry **dir)
{
}
#endif