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 int ret;
26
27 ret = drm_mode_config_helper_suspend(dev);
28 if (ret)
29 return ret;
30
31 udl_sync_pending_urbs(dev);
32 return 0;
33}
34
35static int udl_usb_resume(struct usb_interface *interface)
36{
37 struct drm_device *dev = usb_get_intfdata(interface);
38
39 return drm_mode_config_helper_resume(dev);
40}
41
42static int udl_usb_reset_resume(struct usb_interface *interface)
43{
44 struct drm_device *dev = usb_get_intfdata(interface);
45 struct udl_device *udl = to_udl(dev);
46
47 udl_select_std_channel(udl);
48
49 return drm_mode_config_helper_resume(dev);
50}
51
52/*
53 * FIXME: Dma-buf sharing requires DMA support by the importing device.
54 * This function is a workaround to make USB devices work as well.
55 * See todo.rst for how to fix the issue in the dma-buf framework.
56 */
57static struct drm_gem_object *udl_driver_gem_prime_import(struct drm_device *dev,
58 struct dma_buf *dma_buf)
59{
60 struct udl_device *udl = to_udl(dev);
61
62 if (!udl->dmadev)
63 return ERR_PTR(-ENODEV);
64
65 return drm_gem_prime_import_dev(dev, dma_buf, udl->dmadev);
66}
67
68DEFINE_DRM_GEM_FOPS(udl_driver_fops);
69
70static const struct drm_driver driver = {
71 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
72
73 /* GEM hooks */
74 .fops = &udl_driver_fops,
75 DRM_GEM_SHMEM_DRIVER_OPS,
76 .gem_prime_import = udl_driver_gem_prime_import,
77 DRM_FBDEV_SHMEM_DRIVER_OPS,
78
79 .name = DRIVER_NAME,
80 .desc = DRIVER_DESC,
81 .major = DRIVER_MAJOR,
82 .minor = DRIVER_MINOR,
83 .patchlevel = DRIVER_PATCHLEVEL,
84};
85
86static struct udl_device *udl_driver_create(struct usb_interface *interface)
87{
88 struct udl_device *udl;
89 int r;
90
91 udl = devm_drm_dev_alloc(&interface->dev, &driver,
92 struct udl_device, drm);
93 if (IS_ERR(udl))
94 return udl;
95
96 r = udl_init(udl);
97 if (r)
98 return ERR_PTR(r);
99
100 usb_set_intfdata(interface, udl);
101
102 return udl;
103}
104
105static int udl_usb_probe(struct usb_interface *interface,
106 const struct usb_device_id *id)
107{
108 int r;
109 struct udl_device *udl;
110
111 udl = udl_driver_create(interface);
112 if (IS_ERR(udl))
113 return PTR_ERR(udl);
114
115 r = drm_dev_register(&udl->drm, 0);
116 if (r)
117 return r;
118
119 DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
120
121 drm_client_setup(&udl->drm, NULL);
122
123 return 0;
124}
125
126static void udl_usb_disconnect(struct usb_interface *interface)
127{
128 struct drm_device *dev = usb_get_intfdata(interface);
129
130 drm_kms_helper_poll_fini(dev);
131 udl_drop_usb(dev);
132 drm_dev_unplug(dev);
133}
134
135/*
136 * There are many DisplayLink-based graphics products, all with unique PIDs.
137 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
138 * We also require a match on SubClass (0x00) and Protocol (0x00),
139 * which is compatible with all known USB 2.0 era graphics chips and firmware,
140 * but allows DisplayLink to increment those for any future incompatible chips
141 */
142static const struct usb_device_id id_table[] = {
143 {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
144 .bInterfaceSubClass = 0x00,
145 .bInterfaceProtocol = 0x00,
146 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
147 USB_DEVICE_ID_MATCH_INT_CLASS |
148 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
149 USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
150 {},
151};
152MODULE_DEVICE_TABLE(usb, id_table);
153
154static struct usb_driver udl_driver = {
155 .name = "udl",
156 .probe = udl_usb_probe,
157 .disconnect = udl_usb_disconnect,
158 .suspend = udl_usb_suspend,
159 .resume = udl_usb_resume,
160 .reset_resume = udl_usb_reset_resume,
161 .id_table = id_table,
162};
163module_usb_driver(udl_driver);
164MODULE_DESCRIPTION("KMS driver for the USB displaylink video adapters");
165MODULE_LICENSE("GPL");