1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 James.Bottomley@HansenPartnership.com
4 */
5#include <linux/slab.h>
6#include "tpm-dev.h"
7
8struct tpmrm_priv {
9 struct file_priv priv;
10 struct tpm_space space;
11};
12
13static int tpmrm_open(struct inode *inode, struct file *file)
14{
15 struct tpm_chip *chip;
16 struct tpmrm_priv *priv;
17 int rc;
18
19 chip = container_of(inode->i_cdev, struct tpm_chip, cdevs);
20 priv = kzalloc(size: sizeof(*priv), GFP_KERNEL);
21 if (priv == NULL)
22 return -ENOMEM;
23
24 rc = tpm2_init_space(space: &priv->space, TPM2_SPACE_BUFFER_SIZE);
25 if (rc) {
26 kfree(objp: priv);
27 return -ENOMEM;
28 }
29
30 tpm_common_open(file, chip, priv: &priv->priv, space: &priv->space);
31
32 return 0;
33}
34
35static int tpmrm_release(struct inode *inode, struct file *file)
36{
37 struct file_priv *fpriv = file->private_data;
38 struct tpmrm_priv *priv = container_of(fpriv, struct tpmrm_priv, priv);
39
40 tpm_common_release(file, priv: fpriv);
41 tpm2_del_space(chip: fpriv->chip, space: &priv->space);
42 kfree(objp: priv);
43
44 return 0;
45}
46
47const struct file_operations tpmrm_fops = {
48 .owner = THIS_MODULE,
49 .llseek = no_llseek,
50 .open = tpmrm_open,
51 .read = tpm_common_read,
52 .write = tpm_common_write,
53 .poll = tpm_common_poll,
54 .release = tpmrm_release,
55};
56

source code of linux/drivers/char/tpm/tpmrm-dev.c