xref: /openbmc/linux/drivers/gpu/drm/udl/udl_drv.c (revision 5bd8e16d)
1 /*
2  * Copyright (C) 2012 Red Hat
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License v2. See the file COPYING in the main directory of this archive for
6  * more details.
7  */
8 
9 #include <linux/module.h>
10 #include <drm/drm_usb.h>
11 #include <drm/drm_crtc_helper.h>
12 #include "udl_drv.h"
13 
14 static struct drm_driver driver;
15 
16 /*
17  * There are many DisplayLink-based graphics products, all with unique PIDs.
18  * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
19  * We also require a match on SubClass (0x00) and Protocol (0x00),
20  * which is compatible with all known USB 2.0 era graphics chips and firmware,
21  * but allows DisplayLink to increment those for any future incompatible chips
22  */
23 static struct usb_device_id id_table[] = {
24 	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
25 	 .bInterfaceSubClass = 0x00,
26 	 .bInterfaceProtocol = 0x00,
27 	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
28 			USB_DEVICE_ID_MATCH_INT_CLASS |
29 			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
30 			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
31 	{},
32 };
33 MODULE_DEVICE_TABLE(usb, id_table);
34 
35 MODULE_LICENSE("GPL");
36 
37 static int udl_usb_probe(struct usb_interface *interface,
38 			 const struct usb_device_id *id)
39 {
40 	return drm_get_usb_dev(interface, id, &driver);
41 }
42 
43 static void udl_usb_disconnect(struct usb_interface *interface)
44 {
45 	struct drm_device *dev = usb_get_intfdata(interface);
46 
47 	drm_kms_helper_poll_disable(dev);
48 	drm_connector_unplug_all(dev);
49 	udl_fbdev_unplug(dev);
50 	udl_drop_usb(dev);
51 	drm_unplug_dev(dev);
52 }
53 
54 static const struct vm_operations_struct udl_gem_vm_ops = {
55 	.fault = udl_gem_fault,
56 	.open = drm_gem_vm_open,
57 	.close = drm_gem_vm_close,
58 };
59 
60 static const struct file_operations udl_driver_fops = {
61 	.owner = THIS_MODULE,
62 	.open = drm_open,
63 	.mmap = udl_drm_gem_mmap,
64 	.poll = drm_poll,
65 	.read = drm_read,
66 	.unlocked_ioctl	= drm_ioctl,
67 	.release = drm_release,
68 #ifdef CONFIG_COMPAT
69 	.compat_ioctl = drm_compat_ioctl,
70 #endif
71 	.llseek = noop_llseek,
72 };
73 
74 static struct drm_driver driver = {
75 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
76 	.load = udl_driver_load,
77 	.unload = udl_driver_unload,
78 
79 	/* gem hooks */
80 	.gem_init_object = udl_gem_init_object,
81 	.gem_free_object = udl_gem_free_object,
82 	.gem_vm_ops = &udl_gem_vm_ops,
83 
84 	.dumb_create = udl_dumb_create,
85 	.dumb_map_offset = udl_gem_mmap,
86 	.dumb_destroy = drm_gem_dumb_destroy,
87 	.fops = &udl_driver_fops,
88 
89 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
90 	.gem_prime_import = udl_gem_prime_import,
91 
92 	.name = DRIVER_NAME,
93 	.desc = DRIVER_DESC,
94 	.date = DRIVER_DATE,
95 	.major = DRIVER_MAJOR,
96 	.minor = DRIVER_MINOR,
97 	.patchlevel = DRIVER_PATCHLEVEL,
98 };
99 
100 static struct usb_driver udl_driver = {
101 	.name = "udl",
102 	.probe = udl_usb_probe,
103 	.disconnect = udl_usb_disconnect,
104 	.id_table = id_table,
105 };
106 
107 static int __init udl_init(void)
108 {
109 	return drm_usb_init(&driver, &udl_driver);
110 }
111 
112 static void __exit udl_exit(void)
113 {
114 	drm_usb_exit(&driver, &udl_driver);
115 }
116 
117 module_init(udl_init);
118 module_exit(udl_exit);
119