linux/drivers/platform/x86/intel_scu_ipcutil.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for the Intel SCU IPC mechanism
 *
 * (C) Copyright 2008-2010 Intel Corporation
 * Author: Sreedhara DS ([email protected])
 *
 * This driver provides IOCTL interfaces to call Intel SCU IPC driver API.
 */

#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/uaccess.h>

#include <linux/platform_data/x86/intel_scu_ipc.h>

static int major;

static struct intel_scu_ipc_dev *scu;
static DEFINE_MUTEX(scu_lock);

/* IOCTL commands */
#define INTE_SCU_IPC_REGISTER_READ …
#define INTE_SCU_IPC_REGISTER_WRITE …
#define INTE_SCU_IPC_REGISTER_UPDATE …

struct scu_ipc_data { … };

/**
 *	scu_reg_access		-	implement register access ioctls
 *	@cmd: command we are doing (read/write/update)
 *	@data: kernel copy of ioctl data
 *
 *	Allow the user to perform register accesses on the SCU via the
 *	kernel interface
 */

static int scu_reg_access(u32 cmd, struct scu_ipc_data  *data)
{ … }

/**
 *	scu_ipc_ioctl		-	control ioctls for the SCU
 *	@fp: file handle of the SCU device
 *	@cmd: ioctl coce
 *	@arg: pointer to user passed structure
 *
 *	Support the I/O and firmware flashing interfaces of the SCU
 */
static long scu_ipc_ioctl(struct file *fp, unsigned int cmd,
							unsigned long arg)
{ … }

static int scu_ipc_open(struct inode *inode, struct file *file)
{ … }

static int scu_ipc_release(struct inode *inode, struct file *file)
{ … }

static const struct file_operations scu_ipc_fops = …;

static int __init ipc_module_init(void)
{ … }

static void __exit ipc_module_exit(void)
{ … }

module_init(…) …;
module_exit(ipc_module_exit);

MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_AUTHOR(…) …;