ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/char/tpm/tpm-dev.c b/marvell/linux/drivers/char/tpm/tpm-dev.c
new file mode 100644
index 0000000..e2c0baa
--- /dev/null
+++ b/marvell/linux/drivers/char/tpm/tpm-dev.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2004 IBM Corporation
+ * Authors:
+ * Leendert van Doorn <leendert@watson.ibm.com>
+ * Dave Safford <safford@watson.ibm.com>
+ * Reiner Sailer <sailer@watson.ibm.com>
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * Copyright (C) 2013 Obsidian Research Corp
+ * Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
+ *
+ * Device file system interface to the TPM
+ */
+#include <linux/slab.h>
+#include "tpm-dev.h"
+
+static int tpm_open(struct inode *inode, struct file *file)
+{
+ struct tpm_chip *chip;
+ struct file_priv *priv;
+
+ chip = container_of(inode->i_cdev, struct tpm_chip, cdev);
+
+ /* It's assured that the chip will be opened just once,
+ * by the check of is_open variable, which is protected
+ * by driver_lock. */
+ if (test_and_set_bit(0, &chip->is_open)) {
+ dev_dbg(&chip->dev, "Another process owns this TPM\n");
+ return -EBUSY;
+ }
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (priv == NULL)
+ goto out;
+
+ tpm_common_open(file, chip, priv, NULL);
+
+ return 0;
+
+ out:
+ clear_bit(0, &chip->is_open);
+ return -ENOMEM;
+}
+
+/*
+ * Called on file close
+ */
+static int tpm_release(struct inode *inode, struct file *file)
+{
+ struct file_priv *priv = file->private_data;
+
+ tpm_common_release(file, priv);
+ clear_bit(0, &priv->chip->is_open);
+ kfree(priv);
+
+ return 0;
+}
+
+const struct file_operations tpm_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .open = tpm_open,
+ .read = tpm_common_read,
+ .write = tpm_common_write,
+ .poll = tpm_common_poll,
+ .release = tpm_release,
+};