1 /* 2 * Copyright (C) 2017 James.Bottomley@HansenPartnership.com 3 * 4 * GPLv2 5 */ 6 #include <linux/slab.h> 7 #include "tpm-dev.h" 8 9 struct tpmrm_priv { 10 struct file_priv priv; 11 struct tpm_space space; 12 }; 13 14 static int tpmrm_open(struct inode *inode, struct file *file) 15 { 16 struct tpm_chip *chip; 17 struct tpmrm_priv *priv; 18 int rc; 19 20 chip = container_of(inode->i_cdev, struct tpm_chip, cdevs); 21 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 22 if (priv == NULL) 23 return -ENOMEM; 24 25 rc = tpm2_init_space(&priv->space); 26 if (rc) { 27 kfree(priv); 28 return -ENOMEM; 29 } 30 31 tpm_common_open(file, chip, &priv->priv); 32 33 return 0; 34 } 35 36 static int tpmrm_release(struct inode *inode, struct file *file) 37 { 38 struct file_priv *fpriv = file->private_data; 39 struct tpmrm_priv *priv = container_of(fpriv, struct tpmrm_priv, priv); 40 41 tpm_common_release(file, fpriv); 42 tpm2_del_space(fpriv->chip, &priv->space); 43 kfree(priv); 44 45 return 0; 46 } 47 48 static ssize_t tpmrm_write(struct file *file, const char __user *buf, 49 size_t size, loff_t *off) 50 { 51 struct file_priv *fpriv = file->private_data; 52 struct tpmrm_priv *priv = container_of(fpriv, struct tpmrm_priv, priv); 53 54 return tpm_common_write(file, buf, size, off, &priv->space); 55 } 56 57 const struct file_operations tpmrm_fops = { 58 .owner = THIS_MODULE, 59 .llseek = no_llseek, 60 .open = tpmrm_open, 61 .read = tpm_common_read, 62 .write = tpmrm_write, 63 .release = tpmrm_release, 64 }; 65 66