tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/clients/drm_client_setup.h>
9#include <drm/drm_drv.h>
10#include <drm/drm_fbdev_shmem.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_modeset_helper.h>
15#include <drm/drm_ioctl.h>
16#include <drm/drm_probe_helper.h>
17#include <drm/drm_print.h>
18
19#include "udl_drv.h"
20
21static int udl_usb_suspend(struct usb_interface *interface,
22 pm_message_t message)
23{
24 struct drm_device *dev = usb_get_intfdata(interface);
25 struct udl_device *udl = to_udl(dev);
26 int ret;
27
28 ret = drm_mode_config_helper_suspend(dev);
29 if (ret)
30 return ret;
31
32 udl_sync_pending_urbs(udl);
33 return 0;
34}
35
36static int udl_usb_resume(struct usb_interface *interface)
37{
38 struct drm_device *dev = usb_get_intfdata(interface);
39
40 return drm_mode_config_helper_resume(dev);
41}
42
43static int udl_usb_reset_resume(struct usb_interface *interface)
44{
45 struct drm_device *dev = usb_get_intfdata(interface);
46 struct udl_device *udl = to_udl(dev);
47
48 udl_select_std_channel(udl);
49
50 return drm_mode_config_helper_resume(dev);
51}
52
53DEFINE_DRM_GEM_FOPS(udl_driver_fops);
54
55static const struct drm_driver driver = {
56 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
57
58 /* GEM hooks */
59 .fops = &udl_driver_fops,
60 DRM_GEM_SHMEM_DRIVER_OPS,
61 DRM_FBDEV_SHMEM_DRIVER_OPS,
62
63 .name = DRIVER_NAME,
64 .desc = DRIVER_DESC,
65 .major = DRIVER_MAJOR,
66 .minor = DRIVER_MINOR,
67 .patchlevel = DRIVER_PATCHLEVEL,
68};
69
70static struct udl_device *udl_driver_create(struct usb_interface *interface)
71{
72 struct udl_device *udl;
73 int r;
74
75 udl = devm_drm_dev_alloc(&interface->dev, &driver,
76 struct udl_device, drm);
77 if (IS_ERR(udl))
78 return udl;
79
80 r = udl_init(udl);
81 if (r)
82 return ERR_PTR(r);
83
84 usb_set_intfdata(interface, udl);
85
86 return udl;
87}
88
89static int udl_usb_probe(struct usb_interface *interface,
90 const struct usb_device_id *id)
91{
92 int r;
93 struct udl_device *udl;
94
95 udl = udl_driver_create(interface);
96 if (IS_ERR(udl))
97 return PTR_ERR(udl);
98
99 r = drm_dev_register(&udl->drm, 0);
100 if (r)
101 return r;
102
103 DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
104
105 drm_client_setup(&udl->drm, NULL);
106
107 return 0;
108}
109
110static void udl_usb_disconnect(struct usb_interface *interface)
111{
112 struct drm_device *dev = usb_get_intfdata(interface);
113 struct udl_device *udl = to_udl(dev);
114
115 drm_dev_unplug(dev);
116 udl_drop_usb(udl);
117}
118
119/*
120 * There are many DisplayLink-based graphics products, all with unique PIDs.
121 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
122 * We also require a match on SubClass (0x00) and Protocol (0x00),
123 * which is compatible with all known USB 2.0 era graphics chips and firmware,
124 * but allows DisplayLink to increment those for any future incompatible chips
125 */
126static const struct usb_device_id id_table[] = {
127 {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
128 .bInterfaceSubClass = 0x00,
129 .bInterfaceProtocol = 0x00,
130 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
131 USB_DEVICE_ID_MATCH_INT_CLASS |
132 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
133 USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
134 {},
135};
136MODULE_DEVICE_TABLE(usb, id_table);
137
138static struct usb_driver udl_driver = {
139 .name = "udl",
140 .probe = udl_usb_probe,
141 .disconnect = udl_usb_disconnect,
142 .suspend = udl_usb_suspend,
143 .resume = udl_usb_resume,
144 .reset_resume = udl_usb_reset_resume,
145 .id_table = id_table,
146};
147module_usb_driver(udl_driver);
148MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters");
149MODULE_LICENSE("GPL");