#ifndef _SWITCH_H_
#define _SWITCH_H_

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
#include <linux/delay.h>

#define DIR_NAME_MAX_LEN        (64)
#define SYSFS_DEV_ERROR         "NA"

enum LOG_LEVEL{
    INFO = 0x1,
    ERR  = 0x2,
    DBG  = 0x4,
    ALL  = 0xf
};

extern int g_switch_loglevel;

#define check_pfun(p) do { \
    if (p == NULL) { \
        if (g_switch_loglevel & ERR) { \
            printk( KERN_ERR "%s, %s is NULL.\n", __FUNCTION__, #p); \
        } \
        return -ENOSYS; \
    } \
} while(0)

#define check_p(p) check_pfun(p)

#define to_switch_obj(x) container_of(x, struct switch_obj, kobj)
#define to_switch_attr(x) container_of(x, struct switch_attribute, attr)
#define to_switch_device_attr(x) container_of(x, struct switch_device_attribute, switch_attr)

#define SWITCH_ATTR(_name, _mode, _show, _store, _type)    \
    { .switch_attr = __ATTR(_name, _mode, _show, _store),  \
      .type = _type }

#define SWITCH_DEVICE_ATTR(_name, _mode, _show, _store, _type) \
struct switch_device_attribute switch_dev_attr_##_name         \
        = SWITCH_ATTR(_name, _mode, _show, _store, _type)

struct switch_obj {
    struct kobject kobj;
    unsigned int index;
};

/* a custom attribute that works just for a struct switch_obj. */
struct switch_attribute {
    struct attribute attr;
    ssize_t (*show)(struct switch_obj *foo, struct switch_attribute *attr, char *buf);
    ssize_t (*store)(struct switch_obj *foo, struct switch_attribute *attr, const char *buf, size_t count);
};

struct switch_device_attribute {
    struct switch_attribute switch_attr;
    int type;
};

struct switch_obj *switch_kobject_create(const char *name, struct kobject *parent);
void switch_kobject_delete(struct switch_obj **obj);

#endif /* _SWITCH_H_ */