xref: /openbmc/linux/drivers/gpu/drm/udl/udl_drv.c (revision 14474950)
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 
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 
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 DEFINE_DRM_GEM_FOPS(udl_driver_fops);
36 
37 static struct drm_driver driver = {
38 	.driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
39 
40 	/* gem hooks */
41 	.gem_create_object = udl_driver_gem_create_object,
42 
43 	.fops = &udl_driver_fops,
44 	DRM_GEM_SHMEM_DRIVER_OPS,
45 
46 	.name = DRIVER_NAME,
47 	.desc = DRIVER_DESC,
48 	.date = DRIVER_DATE,
49 	.major = DRIVER_MAJOR,
50 	.minor = DRIVER_MINOR,
51 	.patchlevel = DRIVER_PATCHLEVEL,
52 };
53 
54 static struct udl_device *udl_driver_create(struct usb_interface *interface)
55 {
56 	struct usb_device *udev = interface_to_usbdev(interface);
57 	struct udl_device *udl;
58 	int r;
59 
60 	udl = devm_drm_dev_alloc(&interface->dev, &driver,
61 				 struct udl_device, drm);
62 	if (IS_ERR(udl))
63 		return udl;
64 
65 	udl->udev = udev;
66 
67 	r = udl_init(udl);
68 	if (r)
69 		return ERR_PTR(r);
70 
71 	usb_set_intfdata(interface, udl);
72 
73 	return udl;
74 }
75 
76 static int udl_usb_probe(struct usb_interface *interface,
77 			 const struct usb_device_id *id)
78 {
79 	int r;
80 	struct udl_device *udl;
81 
82 	udl = udl_driver_create(interface);
83 	if (IS_ERR(udl))
84 		return PTR_ERR(udl);
85 
86 	r = drm_dev_register(&udl->drm, 0);
87 	if (r)
88 		return r;
89 
90 	DRM_INFO("Initialized udl on minor %d\n", udl->drm.primary->index);
91 
92 	drm_fbdev_generic_setup(&udl->drm, 0);
93 
94 	return 0;
95 }
96 
97 static void udl_usb_disconnect(struct usb_interface *interface)
98 {
99 	struct drm_device *dev = usb_get_intfdata(interface);
100 
101 	drm_kms_helper_poll_fini(dev);
102 	udl_drop_usb(dev);
103 	drm_dev_unplug(dev);
104 }
105 
106 /*
107  * There are many DisplayLink-based graphics products, all with unique PIDs.
108  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
109  * We also require a match on SubClass (0x00) and Protocol (0x00),
110  * which is compatible with all known USB 2.0 era graphics chips and firmware,
111  * but allows DisplayLink to increment those for any future incompatible chips
112  */
113 static const struct usb_device_id id_table[] = {
114 	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
115 	 .bInterfaceSubClass = 0x00,
116 	 .bInterfaceProtocol = 0x00,
117 	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
118 			USB_DEVICE_ID_MATCH_INT_CLASS |
119 			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
120 			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
121 	{},
122 };
123 MODULE_DEVICE_TABLE(usb, id_table);
124 
125 static struct usb_driver udl_driver = {
126 	.name = "udl",
127 	.probe = udl_usb_probe,
128 	.disconnect = udl_usb_disconnect,
129 	.suspend = udl_usb_suspend,
130 	.resume = udl_usb_resume,
131 	.id_table = id_table,
132 };
133 module_usb_driver(udl_driver);
134 MODULE_LICENSE("GPL");
135