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68 lines
1.5 KiB
68 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2004 IBM Corporation |
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* Authors: |
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* Leendert van Doorn <[email protected]> |
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* Dave Safford <[email protected]> |
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* Reiner Sailer <[email protected]> |
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* Kylene Hall <[email protected]> |
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* |
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* Copyright (C) 2013 Obsidian Research Corp |
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* Jason Gunthorpe <[email protected]> |
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* |
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* Device file system interface to the TPM |
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*/ |
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#include <linux/slab.h> |
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#include "tpm-dev.h" |
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static int tpm_open(struct inode *inode, struct file *file) |
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{ |
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struct tpm_chip *chip; |
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struct file_priv *priv; |
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chip = container_of(inode->i_cdev, struct tpm_chip, cdev); |
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/* It's assured that the chip will be opened just once, |
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* by the check of is_open variable, which is protected |
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* by driver_lock. */ |
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if (test_and_set_bit(0, &chip->is_open)) { |
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dev_dbg(&chip->dev, "Another process owns this TPM\n"); |
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return -EBUSY; |
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} |
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priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
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if (priv == NULL) |
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goto out; |
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tpm_common_open(file, chip, priv, NULL); |
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return 0; |
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out: |
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clear_bit(0, &chip->is_open); |
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return -ENOMEM; |
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} |
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/* |
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* Called on file close |
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*/ |
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static int tpm_release(struct inode *inode, struct file *file) |
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{ |
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struct file_priv *priv = file->private_data; |
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tpm_common_release(file, priv); |
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clear_bit(0, &priv->chip->is_open); |
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kfree(priv); |
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return 0; |
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} |
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const struct file_operations tpm_fops = { |
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.owner = THIS_MODULE, |
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.llseek = no_llseek, |
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.open = tpm_open, |
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.read = tpm_common_read, |
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.write = tpm_common_write, |
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.poll = tpm_common_poll, |
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.release = tpm_release, |
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};
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