drivers/gpu/drm/udl/udl_drv.c

   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
  14 static int udl_driver_set_busid(struct drm_device *d, struct drm_master *m)
  15 {
  16         return 0;
  17 }
  18
  19 static 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
  25 static 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
  39 static 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
  67 static 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
  87 err_free:
  88         drm_dev_unref(dev);
  89         return r;
  90 }
  91
  92 static 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  */
 109 static 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 };
 119 MODULE_DEVICE_TABLE(usb, id_table);
 120
 121 static struct usb_driver udl_driver = {
 122         .name = "udl",
 123         .probe = udl_usb_probe,
 124         .disconnect = udl_usb_disconnect,
 125         .id_table = id_table,
 126 };
 127 module_usb_driver(udl_driver);
 128 MODULE_LICENSE("GPL");