// SPDX-License-Identifier: GPL-2.0
/* Bluetooth HCI driver model support. */

#include <linux/module.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

static const struct class bt_class = {
        .name = "bluetooth",
};

static void bt_link_release(struct device *dev)
{
        struct hci_conn *conn = to_hci_conn(dev);
        kfree(conn);
}

static const struct device_type bt_link = {
        .name    = "link",
        .release = bt_link_release,
};

void hci_conn_init_sysfs(struct hci_conn *conn)
{
        struct hci_dev *hdev = conn->hdev;

        bt_dev_dbg(hdev, "conn %p", conn);

        conn->dev.type = &bt_link;
        conn->dev.class = &bt_class;
        conn->dev.parent = &hdev->dev;

        device_initialize(&conn->dev);
}

void hci_conn_add_sysfs(struct hci_conn *conn)
{
        struct hci_dev *hdev = conn->hdev;

        bt_dev_dbg(hdev, "conn %p", conn);

        if (device_is_registered(&conn->dev))
                return;

        dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);

        if (device_add(&conn->dev) < 0)
                bt_dev_err(hdev, "failed to register connection device");
}

void hci_conn_del_sysfs(struct hci_conn *conn)
{
        struct hci_dev *hdev = conn->hdev;

        bt_dev_dbg(hdev, "conn %p", conn);

        if (!device_is_registered(&conn->dev)) {
                /* If device_add() has *not* succeeded, use *only* put_device()
                 * to drop the reference count.
                 */
                put_device(&conn->dev);
                return;
        }

        /* If there are devices using the connection as parent reset it to NULL
         * before unregistering the device.
         */
        while (1) {
                struct device *dev;

                dev = device_find_any_child(&conn->dev);
                if (!dev)
                        break;
                device_move(dev, NULL, DPM_ORDER_DEV_LAST);
                put_device(dev);
        }

        device_unregister(&conn->dev);
}

static void bt_host_release(struct device *dev)
{
        struct hci_dev *hdev = to_hci_dev(dev);

        if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
                hci_release_dev(hdev);
        else
                kfree(hdev);
        module_put(THIS_MODULE);
}

static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
{
        struct hci_dev *hdev = to_hci_dev(dev);

        if (hdev->reset)
                hdev->reset(hdev);

        return count;
}
static DEVICE_ATTR_WO(reset);

static struct attribute *bt_host_attrs[] = {
        &dev_attr_reset.attr,
        NULL,
};
ATTRIBUTE_GROUPS(bt_host);

static const struct device_type bt_host = {
        .name    = "host",
        .release = bt_host_release,
        .groups = bt_host_groups,
};

void hci_init_sysfs(struct hci_dev *hdev)
{
        struct device *dev = &hdev->dev;

        dev->type = &bt_host;
        dev->class = &bt_class;

        __module_get(THIS_MODULE);
        device_initialize(dev);
}

int __init bt_sysfs_init(void)
{
        return class_register(&bt_class);
}

void bt_sysfs_cleanup(void)
{
        class_unregister(&bt_class);
}