drivers/char/tpm/tpmrm-dev.c

   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
   8 struct tpmrm_priv {
   9         struct file_priv priv;
  10         struct tpm_space space;
  11 };
  12
  13 static 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(sizeof(*priv), GFP_KERNEL);
  21         if (priv == NULL)
  22                 return -ENOMEM;
  23
  24         rc = tpm2_init_space(&priv->space, TPM2_SPACE_BUFFER_SIZE);
  25         if (rc) {
  26                 kfree(priv);
  27                 return -ENOMEM;
  28         }
  29
  30         tpm_common_open(file, chip, &priv->priv, &priv->space);
  31
  32         return 0;
  33 }
  34
  35 static 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, fpriv);
  41         tpm2_del_space(fpriv->chip, &priv->space);
  42         kfree(priv);
  43
  44         return 0;
  45 }
  46
  47 const 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 };