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 28 enum tpm_timeout { 29 TPM_TIMEOUT = 5, /* msecs */ 30 }; 31 32 /* TPM addresses */ 33 enum tpm_addr { 34 TPM_SUPERIO_ADDR = 0x2E, 35 TPM_ADDR = 0x4E, 36 }; 37 38 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, 39 char *); 40 extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, 41 char *); 42 extern ssize_t tpm_show_caps(struct device *, struct device_attribute *attr, 43 char *); 44 extern ssize_t tpm_store_cancel(struct device *, struct device_attribute *attr, 45 const char *, size_t); 46 47 struct tpm_chip; 48 49 struct tpm_vendor_specific { 50 u8 req_complete_mask; 51 u8 req_complete_val; 52 u8 req_canceled; 53 u16 base; /* TPM base address */ 54 55 int (*recv) (struct tpm_chip *, u8 *, size_t); 56 int (*send) (struct tpm_chip *, u8 *, size_t); 57 void (*cancel) (struct tpm_chip *); 58 struct miscdevice miscdev; 59 struct attribute_group *attr_group; 60 }; 61 62 struct tpm_chip { 63 struct pci_dev *pci_dev; /* PCI device stuff */ 64 65 int dev_num; /* /dev/tpm# */ 66 int num_opens; /* only one allowed */ 67 int time_expired; 68 69 /* Data passed to and from the tpm via the read/write calls */ 70 u8 *data_buffer; 71 atomic_t data_pending; 72 struct semaphore buffer_mutex; 73 74 struct timer_list user_read_timer; /* user needs to claim result */ 75 struct semaphore tpm_mutex; /* tpm is processing */ 76 77 struct tpm_vendor_specific *vendor; 78 79 struct list_head list; 80 }; 81 82 static inline int tpm_read_index(int base, int index) 83 { 84 outb(index, base); 85 return inb(base+1) & 0xFF; 86 } 87 88 static inline void tpm_write_index(int base, int index, int value) 89 { 90 outb(index, base); 91 outb(value & 0xFF, base+1); 92 } 93 94 extern int tpm_register_hardware(struct pci_dev *, 95 struct tpm_vendor_specific *); 96 extern int tpm_open(struct inode *, struct file *); 97 extern int tpm_release(struct inode *, struct file *); 98 extern ssize_t tpm_write(struct file *, const char __user *, size_t, 99 loff_t *); 100 extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); 101 extern void __devexit tpm_remove(struct pci_dev *); 102 extern int tpm_pm_suspend(struct pci_dev *, pm_message_t); 103 extern int tpm_pm_resume(struct pci_dev *); 104