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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/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