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#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/miscdevice.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <asm/uaccess.h>
#define LEVEL_DEV_NAME "level"
#define LEVEL_DEV_IOCTL_CMD 0xee
#define LEVEL_DEV_UNSET_UPLOAD _IO(LEVEL_DEV_IOCTL_CMD, 0x1)
#define LEVEL_DEV_SET_AUTOTEST _IO(LEVEL_DEV_IOCTL_CMD, 0x2)
#define LEVEL_DEV_SET_DEBUGLEVEL _IO(LEVEL_DEV_IOCTL_CMD, 0x3)
#define LEVEL_DEV_GET_DEBUGLEVEL _IO(LEVEL_DEV_IOCTL_CMD, 0x4)
#define KERNEL_SEC_DEBUG_LEVEL_LOW 0xA0A0
#define KERNEL_SEC_DEBUG_LEVEL_MID 0xB0B0
#define KERNEL_SEC_DEBUG_LEVEL_HIGH 0xC0C0
#define FAKED_DEBUG_LEVEL KERNEL_SEC_DEBUG_LEVEL_HIGH
static unsigned int get_debug_level(void);
static ssize_t show_control(struct device *d,
struct device_attribute *attr, char *buf);
static ssize_t store_control(struct device *d,
struct device_attribute *attr, const char *buf, size_t count);
static DEVICE_ATTR(control, S_IRUGO | S_IWUGO, show_control, store_control);
static struct attribute *levelctl_attributes[] = {
&dev_attr_control.attr,
NULL
};
static const struct attribute_group levelctl_group = {
.attrs = levelctl_attributes,
};
static ssize_t show_control(struct device *d,
struct device_attribute *attr, char *buf)
{
char *p = buf;
unsigned int val;
val = get_debug_level();
p += sprintf(p, "0x%4x\n",val);
return p - buf;
}
static ssize_t store_control(struct device *d,
struct device_attribute *attr, const char *buf, size_t count)
{
if(!strncmp(buf, "clear", 5)) {
// clear upload magic number
printk("fake_level: %s clear", __func__);
//kernel_sec_clear_upload_magic_number();
return count;
}
if(!strncmp(buf, "autotest", 8)) {
// set auto test
printk("fake_level: %s autotest", __func__);
//kernel_sec_set_autotest();
return count;
}
if(!strncmp(buf, "set", 3)) {
// set debug level
printk("fake_level: %s set", __func__);
//set_debug_level();
return count;
}
return count;
}
static int level_open(struct inode *inode, struct file *filp)
{
printk("level Device open\n");
return 0;
}
static int level_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
unsigned int val;
switch (cmd) {
case LEVEL_DEV_UNSET_UPLOAD:
printk("fake_level: %s LEVEL_DEV_UNSET_UPLOAD", __func__);
//kernel_sec_clear_upload_magic_number();
return 0;
case LEVEL_DEV_SET_AUTOTEST:
printk("fake_level: %s LEVEL_DEV_SET_AUTOTEST", __func__);
//kernel_sec_set_autotest();
return 0;
case LEVEL_DEV_SET_DEBUGLEVEL:
printk("fake_level: %s LEVEL_DEV_SET_DEBUGLEVEL", __func__);
//set_debug_level();
return 0;
case LEVEL_DEV_GET_DEBUGLEVEL:
{
val = get_debug_level();
return copy_to_user((unsigned int *)arg, &val, sizeof(val));
}
default:
printk("Unknown Cmd: %x\n", cmd);
break;
}
return -ENOTSUPP;
}
static unsigned int get_debug_level()
{
return FAKED_DEBUG_LEVEL;
}
static struct file_operations level_fops =
{
.owner = THIS_MODULE,
.open = level_open,
.unlocked_ioctl = level_ioctl,
};
static struct miscdevice level_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = LEVEL_DEV_NAME,
.fops = &level_fops,
};
/* init & cleanup. */
static int __init level_init(void)
{
int result;
printk("level device init\n");
result = misc_register(&level_device);
if (result <0)
return result;
result = sysfs_create_group(&level_device.this_device->kobj, &levelctl_group);
if (result < 0) {
printk("failed to create sysfs files\n");
}
return 0;
}
static void __exit level_exit(void)
{
printk("level device exit\n");
misc_deregister(&level_device);
}
module_init(level_init);
module_exit(level_exit);
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