LXR linux/drivers/gpu/drm/udl/udl

   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_handle_to_fd = drm_gem_prime_handle_to_fd,
  55        .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  56        .gem_prime_export = udl_gem_prime_export,
  57        .gem_prime_import = udl_gem_prime_import,
  58
  59        .name = DRIVER_NAME,
  60        .desc = DRIVER_DESC,
  61        .date = DRIVER_DATE,
  62        .major = DRIVER_MAJOR,
  63        .minor = DRIVER_MINOR,
  64        .patchlevel = DRIVER_PATCHLEVEL,
  65};
  66
  67static int udl_usb_probe(struct usb_interface *interface,
  68                         const struct usb_device_id *id)
  69{
  70        struct usb_device *udev = interface_to_usbdev(interface);
  71        struct drm_device *dev;
  72        int r;
  73
  74        dev = drm_dev_alloc(&driver, &interface->dev);
  75        if (!dev)
  76                return -ENOMEM;
  77
  78        r = drm_dev_register(dev, (unsigned long)udev);
  79        if (r)
  80                goto err_free;
  81
  82        usb_set_intfdata(interface, dev);
  83        DRM_INFO("Initialized udl on minor %d\n", dev->primary->index);
  84
  85        return 0;
  86
  87err_free:
  88        drm_dev_unref(dev);
  89        return r;
  90}
  91
  92static void udl_usb_disconnect(struct usb_interface *interface)
  93{
  94        struct drm_device *dev = usb_get_intfdata(interface);
  95
  96        drm_kms_helper_poll_disable(dev);
  97        udl_fbdev_unplug(dev);
  98        udl_drop_usb(dev);
  99        drm_unplug_dev(dev);
 100}
 101
 102/*
 103 * There are many DisplayLink-based graphics products, all with unique PIDs.
 104 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)
 105 * We also require a match on SubClass (0x00) and Protocol (0x00),
 106 * which is compatible with all known USB 2.0 era graphics chips and firmware,
 107 * but allows DisplayLink to increment those for any future incompatible chips
 108 */
 109static struct usb_device_id id_table[] = {
 110        {.idVendor = 0x17e9, .bInterfaceClass = 0xff,
 111         .bInterfaceSubClass = 0x00,
 112         .bInterfaceProtocol = 0x00,
 113         .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
 114                        USB_DEVICE_ID_MATCH_INT_CLASS |
 115                        USB_DEVICE_ID_MATCH_INT_SUBCLASS |
 116                        USB_DEVICE_ID_MATCH_INT_PROTOCOL,},
 117        {},
 118};
 119MODULE_DEVICE_TABLE(usb, id_table);
 120
 121static struct usb_driver udl_driver = {
 122        .name = "udl",
 123        .probe = udl_usb_probe,
 124        .disconnect = udl_usb_disconnect,
 125        .id_table = id_table,
 126};
 127module_usb_driver(udl_driver);
 128MODULE_LICENSE("GPL");
 129