1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2012 Red Hat
  4 */
  5
  6#include <linux/module.h>
  7
  8#include <drm/drm_crtc_helper.h>
  9#include <drm/drm_drv.h>
 10#include <drm/drm_fb_helper.h>
 11#include <drm/drm_file.h>
 12#include <drm/drm_gem_shmem_helper.h>
 13#include <drm/drm_managed.h>
 14#include <drm/drm_ioctl.h>
 15#include <drm/drm_probe_helper.h>
 16#include <drm/drm_print.h>
 17
 18#include "udl_drv.h"
 19
 20static int udl_usb_suspend(struct usb_interface *interface,
 21			   pm_message_t message)
 22{
 23	struct drm_device *dev = usb_get_intfdata(interface);
 24
 25	return drm_mode_config_helper_suspend(dev);
 26}
 27
 28static int udl_usb_resume(struct usb_interface *interface)
 29{
 30	struct drm_device *dev = usb_get_intfdata(interface);
 31
 32	return drm_mode_config_helper_resume(dev);
 33}
 34
 35/*
 36 * FIXME: Dma-buf sharing requires DMA support by the importing device.
 37 *        This function is a workaround to make USB devices work as well.
 38 *        See todo.rst for how to fix the issue in the dma-buf framework.
 39 */
 40static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
 41							  struct dma_buf *dma_buf)
 42{
 43	struct udl_device *udl = to_udl(dev);
 44
 45	if (!udl->dmadev)
 46		return ERR_PTR(-ENODEV);
 47
 48	return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
 49}
 50
 51DEFINE_DRM_GEM_FOPS(udl_driver_fops);
 52
 53static const struct drm_driver driver = {
 54	.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
 55
 56	/* GEM hooks */
 57	.fops = &udl_driver_fops,
 58	DRM_GEM_SHMEM_DRIVER_OPS,
 59	.gem_prime_import = udl_driver_gem_prime_import,
 60
 61	.name = DRIVER_NAME,
 62	.desc = DRIVER_DESC,
 63	.date = DRIVER_DATE,
 64	.major = DRIVER_MAJOR,
 65	.minor = DRIVER_MINOR,
 66	.patchlevel = DRIVER_PATCHLEVEL,
 67};
 68
 69static struct udl_device *udl_driver_create(struct usb_interface *interface)
 70{
 71	struct udl_device *udl;
 72	int r;
 73
 74	udl = devm_drm_dev_alloc(&interface->dev, &driver,
 75				 struct udl_device, drm);
 76	if (IS_ERR(udl))
 77		return udl;
 78
 79	r = udl_init(udl);
 80	if (r)
 81		return ERR_PTR(r);
 82
 83	usb_set_intfdata(interface, udl);
 84
 85	return udl;
 86}
 87
 88static int udl_usb_probe(struct usb_interface *interface,
 89			 const struct usb_device_id *id)
 90{
 91	int r;
 92	struct udl_device *udl;
 93
 94	udl = udl_driver_create(interface);
 95	if (IS_ERR(udl))
 96		return PTR_ERR(udl);
 97
 98	r = drm_dev_register(&udl->drm, 0);
 99	if (r)
100		return r;
101
102	DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
103
104	drm_fbdev_generic_setup(&udl->drm, 0);
105
106	return 0;
107}
108
109static void udl_usb_disconnect(struct usb_interface *interface)
110{
111	struct drm_device *dev = usb_get_intfdata(interface);
112
113	drm_kms_helper_poll_fini(dev);
114	udl_drop_usb(dev);
115	drm_dev_unplug(dev);
116}
117
118/*
119 * There are many DisplayLink-based graphics products, all with unique PIDs.
120 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
121 * We also require a match on SubClass (0x00) and Protocol (0x00),
122 * which is compatible with all known USB 2.0 era graphics chips and firmware,
123 * but allows DisplayLink to increment those for any future incompatible chips
124 */
125static const struct usb_device_id id_table[] = {
126	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
127	 .bInterfaceSubClass = 0x00,
128	 .bInterfaceProtocol = 0x00,
129	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
130			USB_DEVICE_ID_MATCH_INT_CLASS |
131			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
132			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
133	{},
134};
135MODULE_DEVICE_TABLE(usb, id_table);
136
137static struct usb_driver udl_driver = {
138	.name = "udl",
139	.probe = udl_usb_probe,
140	.disconnect = udl_usb_disconnect,
141	.suspend = udl_usb_suspend,
142	.resume = udl_usb_resume,
143	.id_table = id_table,
144};
145module_usb_driver(udl_driver);
146MODULE_LICENSE("GPL");