Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2004 IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Leendert van Doorn <leendert@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Dave Safford <safford@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Reiner Sailer <sailer@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Kylene Hall <kjhall@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * Copyright (C) 2013 Obsidian Research Corp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * Device file system interface to the TPM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "tpm-dev.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static int tpm_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	struct tpm_chip *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	struct file_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	chip = container_of(inode->i_cdev, struct tpm_chip, cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	/* It's assured that the chip will be opened just once,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	 * by the check of is_open variable, which is protected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	 * by driver_lock. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (test_and_set_bit(0, &chip->is_open)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		dev_dbg(&chip->dev, "Another process owns this TPM\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if (priv == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	tpm_common_open(file, chip, priv, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	clear_bit(0, &chip->is_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)  * Called on file close
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static int tpm_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	struct file_priv *priv = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	tpm_common_release(file, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	clear_bit(0, &priv->chip->is_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	kfree(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) const struct file_operations tpm_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	.llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	.open = tpm_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	.read = tpm_common_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	.write = tpm_common_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	.poll = tpm_common_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	.release = tpm_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) };