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tpm.h

/*
 * 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/delay.h>
#include <linux/fs.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/miscdevice.h>
#include <linux/platform_device.h>
#include <linux/io.h>

enum tpm_timeout {
      TPM_TIMEOUT = 5,  /* msecs */
};

/* TPM addresses */
enum tpm_addr {
      TPM_SUPERIO_ADDR = 0x2E,
      TPM_ADDR = 0x4E,
};

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 *);
extern ssize_t tpm_show_caps_1_2(struct device *, struct device_attribute *attr,
                        char *);
extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr,
                        const char *, size_t);
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 *);

struct tpm_chip;

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

      int irq;

      int region_size;
      int have_region;

      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 attribute_group *attr_group;
      struct list_head list;
      int locality;
      unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
      unsigned long duration[3]; /* jiffies */

      wait_queue_head_t read_queue;
      wait_queue_head_t int_queue;
};

struct tpm_chip {
      struct device *dev;     /* 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;
      struct mutex buffer_mutex;

      struct timer_list user_read_timer;  /* user needs to claim result */
      struct work_struct work;
      struct mutex tpm_mutex; /* tpm is processing */

      struct tpm_vendor_specific vendor;

      struct dentry **bios_dir;

      struct list_head list;
};

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

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

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

extern void tpm_get_timeouts(struct tpm_chip *);
extern void tpm_gen_interrupt(struct tpm_chip *);
extern void tpm_continue_selftest(struct tpm_chip *);
extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
extern struct tpm_chip* tpm_register_hardware(struct device *,
                         const struct tpm_vendor_specific *);
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 void tpm_remove_hardware(struct device *);
extern int tpm_pm_suspend(struct device *, pm_message_t);
extern int tpm_pm_resume(struct device *);

#ifdef CONFIG_ACPI
extern struct dentry ** tpm_bios_log_setup(char *);
extern void tpm_bios_log_teardown(struct dentry **);
#else
static inline struct dentry ** tpm_bios_log_setup(char *name)
{
      return NULL;
}
static inline void tpm_bios_log_teardown(struct dentry **dir)
{
}
#endif

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