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 struct drm_driver driver = {
54	.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
55
56	/* GEM hooks */
57	.gem_create_object = drm_gem_shmem_create_object_cached,
58
59	.fops = &udl_driver_fops,
60	DRM_GEM_SHMEM_DRIVER_OPS,
61	.gem_prime_import = udl_driver_gem_prime_import,
62
63	.name = DRIVER_NAME,
64	.desc = DRIVER_DESC,
65	.date = DRIVER_DATE,
66	.major = DRIVER_MAJOR,
67	.minor = DRIVER_MINOR,
68	.patchlevel = DRIVER_PATCHLEVEL,
69};
70
71static struct udl_device *udl_driver_create(struct usb_interface *interface)
72{
73	struct usb_device *udev = interface_to_usbdev(interface);
74	struct udl_device *udl;
75	int r;
76
77	udl = devm_drm_dev_alloc(&interface->dev, &driver,
78				 struct udl_device, drm);
79	if (IS_ERR(udl))
80		return udl;
81
82	udl->udev = udev;
83
84	r = udl_init(udl);
85	if (r)
86		return ERR_PTR(r);
87
88	usb_set_intfdata(interface, udl);
89
90	return udl;
91}
92
93static int udl_usb_probe(struct usb_interface *interface,
94			 const struct usb_device_id *id)
95{
96	int r;
97	struct udl_device *udl;
98
99	udl = udl_driver_create(interface);
100	if (IS_ERR(udl))
101		return PTR_ERR(udl);
102
103	r = drm_dev_register(&udl->drm, 0);
104	if (r)
105		return r;
106
107	DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
108
109	drm_fbdev_generic_setup(&udl->drm, 0);
110
111	return 0;
112}
113
114static void udl_usb_disconnect(struct usb_interface *interface)
115{
116	struct drm_device *dev = usb_get_intfdata(interface);
117
118	drm_kms_helper_poll_fini(dev);
119	udl_drop_usb(dev);
120	drm_dev_unplug(dev);
121}
122
123/*
124 * There are many DisplayLink-based graphics products, all with unique PIDs.
125 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
126 * We also require a match on SubClass (0x00) and Protocol (0x00),
127 * which is compatible with all known USB 2.0 era graphics chips and firmware,
128 * but allows DisplayLink to increment those for any future incompatible chips
129 */
130static const struct usb_device_id id_table[] = {
131	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
132	 .bInterfaceSubClass = 0x00,
133	 .bInterfaceProtocol = 0x00,
134	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
135			USB_DEVICE_ID_MATCH_INT_CLASS |
136			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
137			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
138	{},
139};
140MODULE_DEVICE_TABLE(usb, id_table);
141
142static struct usb_driver udl_driver = {
143	.name = "udl",
144	.probe = udl_usb_probe,
145	.disconnect = udl_usb_disconnect,
146	.suspend = udl_usb_suspend,
147	.resume = udl_usb_resume,
148	.id_table = id_table,
149};
150module_usb_driver(udl_driver);
151MODULE_LICENSE("GPL");
152