udl_drv.c revision d4f68a7506e924e28a9153933076628002ba8bbc 
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/drmP.h>
11#include <drm/drm_crtc_helper.h>
12#include "udl_drv.h"
13
14static int udl_driver_set_busid(struct drm_device *d, struct drm_master *m)
15{
16	return 0;
17}
18
19static const struct vm_operations_struct udl_gem_vm_ops = {
20	.fault = udl_gem_fault,
21	.open = drm_gem_vm_open,
22	.close = drm_gem_vm_close,
23};
24
25static const struct file_operations udl_driver_fops = {
26	.owner = THIS_MODULE,
27	.open = drm_open,
28	.mmap = udl_drm_gem_mmap,
29	.poll = drm_poll,
30	.read = drm_read,
31	.unlocked_ioctl	= drm_ioctl,
32	.release = drm_release,
33#ifdef CONFIG_COMPAT
34	.compat_ioctl = drm_compat_ioctl,
35#endif
36	.llseek = noop_llseek,
37};
38
39static struct drm_driver driver = {
40	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
41	.load = udl_driver_load,
42	.unload = udl_driver_unload,
43	.set_busid = udl_driver_set_busid,
44
45	/* gem hooks */
46	.gem_free_object = udl_gem_free_object,
47	.gem_vm_ops = &udl_gem_vm_ops,
48
49	.dumb_create = udl_dumb_create,
50	.dumb_map_offset = udl_gem_mmap,
51	.dumb_destroy = drm_gem_dumb_destroy,
52	.fops = &udl_driver_fops,
53
54	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
55	.gem_prime_import = udl_gem_prime_import,
56
57	.name = DRIVER_NAME,
58	.desc = DRIVER_DESC,
59	.date = DRIVER_DATE,
60	.major = DRIVER_MAJOR,
61	.minor = DRIVER_MINOR,
62	.patchlevel = DRIVER_PATCHLEVEL,
63};
64
65static int udl_usb_probe(struct usb_interface *interface,
66			 const struct usb_device_id *id)
67{
68	struct usb_device *udev = interface_to_usbdev(interface);
69	struct drm_device *dev;
70	int r;
71
72	dev = drm_dev_alloc(&driver, &interface->dev);
73	if (!dev)
74		return -ENOMEM;
75
76	r = drm_dev_register(dev, (unsigned long)udev);
77	if (r)
78		goto err_free;
79
80	usb_set_intfdata(interface, dev);
81	DRM_INFO("Initialized udl on minor %d\n", dev->primary->index);
82
83	return 0;
84
85err_free:
86	drm_dev_unref(dev);
87	return r;
88}
89
90static void udl_usb_disconnect(struct usb_interface *interface)
91{
92	struct drm_device *dev = usb_get_intfdata(interface);
93
94	drm_kms_helper_poll_disable(dev);
95	drm_connector_unplug_all(dev);
96	udl_fbdev_unplug(dev);
97	udl_drop_usb(dev);
98	drm_unplug_dev(dev);
99}
100
101/*
102 * There are many DisplayLink-based graphics products, all with unique PIDs.
103 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
104 * We also require a match on SubClass (0x00) and Protocol (0x00),
105 * which is compatible with all known USB 2.0 era graphics chips and firmware,
106 * but allows DisplayLink to increment those for any future incompatible chips
107 */
108static struct usb_device_id id_table[] = {
109	{.idVendor = 0x17e9, .bInterfaceClass = 0xff,
110	 .bInterfaceSubClass = 0x00,
111	 .bInterfaceProtocol = 0x00,
112	 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
113			USB_DEVICE_ID_MATCH_INT_CLASS |
114			USB_DEVICE_ID_MATCH_INT_SUBCLASS |
115			USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
116	{},
117};
118MODULE_DEVICE_TABLE(usb, id_table);
119
120static struct usb_driver udl_driver = {
121	.name = "udl",
122	.probe = udl_usb_probe,
123	.disconnect = udl_usb_disconnect,
124	.id_table = id_table,
125};
126
127static int __init udl_init(void)
128{
129	return usb_register(&udl_driver);
130}
131
132static void __exit udl_exit(void)
133{
134	usb_deregister(&udl_driver);
135}
136
137module_init(udl_init);
138module_exit(udl_exit);
139MODULE_LICENSE("GPL");
140