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
udl_usb_suspend(struct usb_interface * interface,pm_message_t message)20 static 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
udl_usb_resume(struct usb_interface * interface)28 static 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 */
udl_driver_gem_prime_import(struct drm_device * dev,struct dma_buf * dma_buf)40 static 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
51 DEFINE_DRM_GEM_FOPS(udl_driver_fops);
52
53 static 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
udl_driver_create(struct usb_interface * interface)69 static 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
udl_usb_probe(struct usb_interface * interface,const struct usb_device_id * id)88 static 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
udl_usb_disconnect(struct usb_interface * interface)109 static 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 */
125 static 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 };
135 MODULE_DEVICE_TABLE(usb, id_table);
136
137 static 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 };
145 module_usb_driver(udl_driver);
146 MODULE_LICENSE("GPL");
147