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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Red Hat
*/
#include <linux/module.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_file.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_managed.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);
return drm_mode_config_helper_suspend(dev);
}
static int udl_usb_resume(struct usb_interface *interface)
{
struct drm_device *dev = usb_get_intfdata(interface);
return drm_mode_config_helper_resume(dev);
}
/*
* FIXME: Dma-buf sharing requires DMA support by the importing device.
* This function is a workaround to make USB devices work as well.
* See todo.rst for how to fix the issue in the dma-buf framework.
*/
static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
struct udl_device *udl = to_udl(dev);
if (!udl->dmadev)
return ERR_PTR(-ENODEV);
return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
}
DEFINE_DRM_GEM_FOPS(udl_driver_fops);
static struct drm_driver driver = {
.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
/* GEM hooks */
.gem_create_object = drm_gem_shmem_create_object_cached,
.fops = &udl_driver_fops,
DRM_GEM_SHMEM_DRIVER_OPS,
.gem_prime_import = udl_driver_gem_prime_import,
.name = DRIVER_NAME,
.desc = DRIVER_DESC,
.date = DRIVER_DATE,
.major = DRIVER_MAJOR,
.minor = DRIVER_MINOR,
.patchlevel = DRIVER_PATCHLEVEL,
};
static struct udl_device *udl_driver_create(struct usb_interface *interface)
{
struct usb_device *udev = interface_to_usbdev(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;
udl->udev = udev;
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_fbdev_generic_setup(&udl->drm, 0);
return 0;
}
static void udl_usb_disconnect(struct usb_interface *interface)
{
struct drm_device *dev = usb_get_intfdata(interface);
drm_kms_helper_poll_fini(dev);
udl_drop_usb(dev);
drm_dev_unplug(dev);
}
/*
* 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,
.id_table = id_table,
};
module_usb_driver(udl_driver);
MODULE_LICENSE("GPL");
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