Linux Kernel  3.7.1
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udl_drv.c
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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 |
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 
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  .fasync = drm_fasync,
69 #ifdef CONFIG_COMPAT
70  .compat_ioctl = drm_compat_ioctl,
71 #endif
72  .llseek = noop_llseek,
73 };
74 
75 static struct drm_driver driver = {
76  .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
77  .load = udl_driver_load,
78  .unload = udl_driver_unload,
79 
80  /* gem hooks */
81  .gem_init_object = udl_gem_init_object,
82  .gem_free_object = udl_gem_free_object,
83  .gem_vm_ops = &udl_gem_vm_ops,
84 
85  .dumb_create = udl_dumb_create,
86  .dumb_map_offset = udl_gem_mmap,
87  .dumb_destroy = udl_dumb_destroy,
88  .fops = &udl_driver_fops,
89 
90  .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
91  .gem_prime_import = udl_gem_prime_import,
92 
93  .name = DRIVER_NAME,
94  .desc = DRIVER_DESC,
95  .date = DRIVER_DATE,
96  .major = DRIVER_MAJOR,
97  .minor = DRIVER_MINOR,
98  .patchlevel = DRIVER_PATCHLEVEL,
99 };
100 
101 static struct usb_driver udl_driver = {
102  .name = "udl",
103  .probe = udl_usb_probe,
104  .disconnect = udl_usb_disconnect,
105  .id_table = id_table,
106 };
107 
108 static int __init udl_init(void)
109 {
110  return drm_usb_init(&driver, &udl_driver);
111 }
112 
113 static void __exit udl_exit(void)
114 {
115  drm_usb_exit(&driver, &udl_driver);
116 }
117 
118 module_init(udl_init);
119 module_exit(udl_exit);