1 /* 2 * Copyright (C) 2004 IBM Corporation 3 * 4 * Authors: 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> 9 * 10 * Maintained by: <tpmdd_devel@lists.sourceforge.net> 11 * 12 * Device driver for TCG/TCPA TPM (trusted platform module). 13 * Specifications at www.trustedcomputinggroup.org 14 * 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 18 * License. 19 * 20 */ 21 #include <linux/module.h> 22 #include <linux/version.h> 23 #include <linux/pci.h> 24 #include <linux/delay.h> 25 #include <linux/fs.h> 26 #include <linux/miscdevice.h> 27 #include <linux/platform_device.h> 28 29 enum tpm_timeout { 30 TPM_TIMEOUT = 5, /* msecs */ 31 }; 32 33 /* TPM addresses */ 34 enum tpm_addr { 35 TPM_SUPERIO_ADDR = 0x2E, 36 TPM_ADDR = 0x4E, 37 }; 38 39 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, 40 char *); 41 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, 42 char *); 43 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr, 44 char *); 45 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, 46 const char *, size_t); 47 48 struct tpm_chip; 49 50 struct tpm_vendor_specific { 51 u8 req_complete_mask; 52 u8 req_complete_val; 53 u8 req_canceled; 54 u16 base; /* TPM base address */ 55 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; 62 }; 63 64 struct tpm_chip { 65 struct device *dev; /* Device stuff */ 66 67 int dev_num; /* /dev/tpm# */ 68 int num_opens; /* only one allowed */ 69 int time_expired; 70 71 /* Data passed to and from the tpm via the read/write calls */ 72 u8 *data_buffer; 73 atomic_t data_pending; 74 struct semaphore buffer_mutex; 75 76 struct timer_list user_read_timer; /* user needs to claim result */ 77 struct semaphore tpm_mutex; /* tpm is processing */ 78 79 struct tpm_vendor_specific *vendor; 80 81 struct list_head list; 82 }; 83 84 static inline int tpm_read_index(int base, int index) 85 { 86 outb(index, base); 87 return inb(base+1) & 0xFF; 88 } 89 90 static inline void tpm_write_index(int base, int index, int value) 91 { 92 outb(index, base); 93 outb(value & 0xFF, base+1); 94 } 95 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, 101 loff_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 *); 106