#include <linux/ipaq-sleeve.h>
#include <linux/module.h>
#include <linux/slab.h>

#define to_ipaq_option_driver(x) \
	container_of(x, struct ipaq_option_driver, driver)

static ssize_t vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct ipaq_option_device *idev = to_ipaq_option_device(dev);
	return snprintf(buf, PAGE_SIZE, "%04x\n", idev->id.vendor);
}
static DEVICE_ATTR_RO(vendor);

static ssize_t device_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct ipaq_option_device *idev = to_ipaq_option_device(dev);
	return snprintf(buf, PAGE_SIZE, "%04x\n", idev->id.device);
}
static DEVICE_ATTR_RO(device);

static struct attribute *ipaq_option_sleeve_attrs[] = {
	&dev_attr_vendor.attr,
	&dev_attr_device.attr,
	NULL,
};

static const struct attribute_group ipaq_option_sleeve_dev_group = {
	.attrs = ipaq_option_sleeve_attrs,
};

static const struct attribute_group *ipaq_option_sleeve_dev_groups[] = {
	&ipaq_option_sleeve_dev_group,
	NULL,
};

static int ipaq_option_sleeve_match(struct device *dev, struct device_driver *drv)
{
	struct ipaq_option_device *idev = to_ipaq_option_device(dev);
	struct ipaq_option_driver *idrv = to_ipaq_option_driver(drv);
	const struct ipaq_option_id *id;

	for (id = idrv->id_table; id->vendor || id->device; id++)
		if (id->vendor == idev->id.vendor &&
		    id->device == idev->id.device)
			return 1;

	return 0;
}

static int ipaq_option_sleeve_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct ipaq_option_device *idev = to_ipaq_option_device(dev);

	if (!dev)
		return -ENODEV;

	if (add_uevent_var(env, "MODALIAS=ipaq:v%04Xd%04X",
			   idev->id.vendor, idev->id.device))
		return -ENOMEM;

	return 0;
}

struct bus_type ipaq_option_sleeve_bus = {
	.name = "ipaq-sleeve",
	.dev_groups = ipaq_option_sleeve_dev_groups,
	.match = ipaq_option_sleeve_match,
	.uevent = ipaq_option_sleeve_uevent,
};
EXPORT_SYMBOL_GPL(ipaq_option_sleeve_bus);

static void ipaq_option_release(struct device *dev)
{
	struct ipaq_option_device *opt_dev = to_ipaq_option_device(dev);

	kfree(opt_dev);
}

int ipaq_option_device_add(struct device *parent, struct ipaq_option_id id)
{
	struct ipaq_option_device *idev;

	idev = kzalloc(sizeof(*idev), GFP_KERNEL);
	if (!idev)
		return -ENOMEM;

	idev->id = id;
	device_initialize(&idev->dev);
	dev_set_name(&idev->dev, "sleeve");
	idev->dev.parent = parent;
	idev->dev.release = ipaq_option_release;
	idev->dev.bus = &ipaq_option_sleeve_bus;

	return device_add(&idev->dev);
}
EXPORT_SYMBOL_GPL(ipaq_option_device_add);

static int ipaq_option_device_remove(struct device *dev, void *data)
{
	device_unregister(dev);
	return 0;
}

void ipaq_option_device_del(void)
{
	bus_for_each_dev(&ipaq_option_sleeve_bus, NULL, NULL,
			 ipaq_option_device_remove);
}
EXPORT_SYMBOL_GPL(ipaq_option_device_del);

static int ipaq_option_sleeve_init(void)
{
	return bus_register(&ipaq_option_sleeve_bus);
}
core_initcall(ipaq_option_sleeve_init);

static void ipaq_option_sleeve_exit(void)
{
	bus_unregister(&ipaq_option_sleeve_bus);
}
module_exit(ipaq_option_sleeve_exit);

MODULE_LICENSE("GPL");