/*******************************************************************************
 * HangZhou Hikvision Digital Technology Co., Ltd. All Right Reserved.
 * Author       :
 * Version      : V1.0.0  2024.11.15
 * Description  :
 * Note         : anonymity@hikvision.com.cn     Modified        2024.11.15
 ******************************************************************************/
#include <stdarg.h>
#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/kdev_t.h>	// MKDEV

#include "OSAL_osdev.h"

struct device osal_bus = {
	.init_name	= "osal",
};

struct bus_type osal_bus_type = {
	.name		= "osal",
};

struct osdev_device {		// Object
	struct device   dev;
	char name[];
};

struct osdev_driver {
	struct device_driver drv;
};

static void osadev_device_release(struct device *dev)
{
	struct osdev_device *osdev_obj = container_of(dev, struct osdev_device, dev);

	kfree(osdev_obj);
}

OSAL_osdev *OSAL_osdevAlloc(const char *name, int id)
{
	struct device *dev = NULL;
	struct osdev *osdev = NULL;
	struct osdev_device *osdev_obj = NULL;

	osdev_obj = kzalloc(sizeof(struct osdev_device) + strlen(name) + 1, GFP_KERNEL);
	if (!osdev_obj) {
		pr_err("ErrNo(%ld), alloc memory for OSAL_sysDevice failed.", PTR_ERR(dev));
		return ERR_PTR(-ENOMEM);
	}
	osdev = &(osdev_obj->osdev);
	dev   = &(osdev_obj->dev);

	strcpy(osdev_obj->name, name);
	osdev->name = osdev_obj->name;
	osdev->id   = id;
	device_initialize(dev);
	dev->release = osadev_device_release;

	osdev->obj = osdev;

	return (OSAL_osdev *)osdev;
}
EXPORT_SYMBOL(OSAL_osdevAlloc);

int OSAL_osdevRegister(OSAL_osdev *osdev)
{
	int ret = 0;
	struct device *dev = NULL;
	struct osdev *osdev_tmp = NULL;
	struct osdev_device *osdev_obj = NULL;
	struct osdev_device *osdev_parent = NULL;

	if (osdev == NULL) {
		pr_err("Error, null pointer exception.");
		return -EINVAL;
	}

	if (!osdev->obj) {
		osdev_tmp = OSAL_osdevAlloc(osdev->name, osdev->id);
		osdev->obj = osdev_tmp;
	}
	else {
		osdev_tmp = osdev->obj;
		osdev_parent = container_of(osdev_tmp, struct osdev_device, osdev);
	}
	osdev_obj = container_of(osdev_tmp->obj, struct osdev_device, osdev);
	dev       = &(osdev_obj->dev);

	dev_set_name(dev, "%s.%d", osdev->name, osdev->id);
	dev_set_drvdata(dev, osdev_obj);
	dev->bus    = &osal_bus_type;
	dev->devt   = MKDEV(0, 0);
	dev->parent = osdev_parent ? &osdev_parent->dev : &osal_bus;

	ret = device_add(dev);
	if (ret) {
		pr_err("ErrNo(%d), add device failed.", ret);
		put_device(dev);
		return ret;
	}

	return ret;
}
EXPORT_SYMBOL(OSAL_osdevRegister);

void OSAL_osdevUnregister(OSAL_osdev *osdev)
{
	struct osdev_device *osdev_obj = NULL;

	if (osdev == NULL || osdev->obj == NULL) {
		pr_err("Error, null pointer exception.");
		return;
	}

	osdev_obj = container_of(osdev->obj, struct osdev_device, osdev);

	device_del(&osdev_obj->dev);
	put_device(&osdev_obj->dev);
}
EXPORT_SYMBOL(OSAL_osdevUnregister);

inline void *OSAL_osdevGetDrvdata(const OSAL_osdev *osdev)
{
	struct osdev_device *osdev_obj = NULL;

	if (osdev == NULL || osdev->obj == NULL) {
		pr_err("Error, null pointer exception.");
		return ERR_PTR(-EINVAL);
	}

	osdev_obj = container_of(osdev->obj, struct osdev_device, osdev);

	return dev_get_drvdata(&osdev_obj->dev);
}
EXPORT_SYMBOL(OSAL_osdevGetDrvdata);

inline void OSAL_osdevSetDrvdata(OSAL_osdev *osdev, void *data)
{
	struct osdev_device *osdev_obj = NULL;

	if (osdev == NULL || osdev->obj == NULL) {
		pr_err("Error, null pointer exception.");
		return;
	}

	osdev_obj = container_of(osdev->obj, struct osdev_device, osdev);

	dev_set_drvdata(&osdev_obj->dev, data);
}
EXPORT_SYMBOL(OSAL_osdevSetDrvdata);

int __init OSAL_osdevInit(void)
{
	int ret = 0;

	ret = device_register(&osal_bus);
	if (ret) {
		pr_err("ErrNo(%d), register bus Device[osal] failed.", ret);
		put_device(&osal_bus);
		goto out;
	}

	ret =  bus_register(&osal_bus_type);
	if (ret) {
		pr_err("ErrNo(%d), register bus Type[osal] failed.", ret);
		goto out_unregister_bus;
	}

	pr_info("OSAL_osdev initialize completed.");

	return ret;

out_unregister_bus:
	device_unregister(&osal_bus);
out:
	return ret;
}

void __exit OSAL_osdevExit(void)
{
	bus_unregister(&osal_bus_type);
	device_unregister(&osal_bus);
}