// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Red Hat
 */

#include <linux/module.h>

#include <drm/clients/drm_client_setup.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_shmem.h>
#include <drm/drm_file.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_managed.h>
#include <drm/drm_modeset_helper.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_print.h>

#include "udl_drv.h"

static int udl_usb_suspend(struct usb_interface *interface,
                           pm_message_t message)
{
        struct drm_device *dev = usb_get_intfdata(interface);
        struct udl_device *udl = to_udl(dev);
        int ret;

        ret = drm_mode_config_helper_suspend(dev);
        if (ret)
                return ret;

        udl_sync_pending_urbs(udl);
        return 0;
}

static int udl_usb_resume(struct usb_interface *interface)
{
        struct drm_device *dev = usb_get_intfdata(interface);

        return drm_mode_config_helper_resume(dev);
}

static int udl_usb_reset_resume(struct usb_interface *interface)
{
        struct drm_device *dev = usb_get_intfdata(interface);
        struct udl_device *udl = to_udl(dev);

        udl_select_std_channel(udl);

        return drm_mode_config_helper_resume(dev);
}

DEFINE_DRM_GEM_FOPS(udl_driver_fops);

static const struct drm_driver driver = {
        .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,

        /* GEM hooks */
        .fops = &udl_driver_fops,
        DRM_GEM_SHMEM_DRIVER_OPS,
        DRM_FBDEV_SHMEM_DRIVER_OPS,

        .name = DRIVER_NAME,
        .desc = DRIVER_DESC,
        .major = DRIVER_MAJOR,
        .minor = DRIVER_MINOR,
        .patchlevel = DRIVER_PATCHLEVEL,
};

static struct udl_device *udl_driver_create(struct usb_interface *interface)
{
        struct udl_device *udl;
        int r;

        udl = devm_drm_dev_alloc(&interface->dev, &driver,
                                 struct udl_device, drm);
        if (IS_ERR(udl))
                return udl;

        r = udl_init(udl);
        if (r)
                return ERR_PTR(r);

        usb_set_intfdata(interface, udl);

        return udl;
}

static int udl_usb_probe(struct usb_interface *interface,
                         const struct usb_device_id *id)
{
        int r;
        struct udl_device *udl;

        udl = udl_driver_create(interface);
        if (IS_ERR(udl))
                return PTR_ERR(udl);

        r = drm_dev_register(&udl->drm, 0);
        if (r)
                return r;

        DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);

        drm_client_setup(&udl->drm, NULL);

        return 0;
}

static void udl_usb_disconnect(struct usb_interface *interface)
{
        struct drm_device *dev = usb_get_intfdata(interface);
        struct udl_device *udl = to_udl(dev);

        drm_dev_unplug(dev);
        udl_drop_usb(udl);
}

/*
 * There are many DisplayLink-based graphics products, all with unique PIDs.
 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 * We also require a match on SubClass (0x00) and Protocol (0x00),
 * which is compatible with all known USB 2.0 era graphics chips and firmware,
 * but allows DisplayLink to increment those for any future incompatible chips
 */
static const struct usb_device_id id_table[] = {
        {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
         .bInterfaceSubClass = 0x00,
         .bInterfaceProtocol = 0x00,
         .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
                        USB_DEVICE_ID_MATCH_INT_CLASS |
                        USB_DEVICE_ID_MATCH_INT_SUBCLASS |
                        USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
        {},
};
MODULE_DEVICE_TABLE(usb, id_table);

static struct usb_driver udl_driver = {
        .name = "udl",
        .probe = udl_usb_probe,
        .disconnect = udl_usb_disconnect,
        .suspend = udl_usb_suspend,
        .resume = udl_usb_resume,
        .reset_resume = udl_usb_reset_resume,
        .id_table = id_table,
};
module_usb_driver(udl_driver);
MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters");
MODULE_LICENSE("GPL");