linux/drivers/char/tpm/tpmrm-dev.c
Tadeusz Struk 9e1b74a63f tpm: add support for nonblocking operation
Currently the TPM driver only supports blocking calls, which doesn't allow
asynchronous IO operations to the TPM hardware.
This patch changes it and adds support for nonblocking write and a new poll
function to enable applications, which want to take advantage of this.

Tested-by: Philip Tricca <philip.b.tricca@intel.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off--by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
2018-10-05 13:47:33 +03:00

57 lines
1.1 KiB
C

/*
* Copyright (C) 2017 James.Bottomley@HansenPartnership.com
*
* GPLv2
*/
#include <linux/slab.h>
#include "tpm-dev.h"
struct tpmrm_priv {
struct file_priv priv;
struct tpm_space space;
};
static int tpmrm_open(struct inode *inode, struct file *file)
{
struct tpm_chip *chip;
struct tpmrm_priv *priv;
int rc;
chip = container_of(inode->i_cdev, struct tpm_chip, cdevs);
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv == NULL)
return -ENOMEM;
rc = tpm2_init_space(&priv->space);
if (rc) {
kfree(priv);
return -ENOMEM;
}
tpm_common_open(file, chip, &priv->priv, &priv->space);
return 0;
}
static int tpmrm_release(struct inode *inode, struct file *file)
{
struct file_priv *fpriv = file->private_data;
struct tpmrm_priv *priv = container_of(fpriv, struct tpmrm_priv, priv);
tpm_common_release(file, fpriv);
tpm2_del_space(fpriv->chip, &priv->space);
kfree(priv);
return 0;
}
const struct file_operations tpmrm_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.open = tpmrm_open,
.read = tpm_common_read,
.write = tpm_common_write,
.poll = tpm_common_poll,
.release = tpmrm_release,
};