drivers/gpu/drm/drm_usb.c

   1 #include "drmP.h"
   2 #include <linux/usb.h>
   3 #include <linux/module.h>
   4
   5 int drm_get_usb_dev(struct usb_interface *interface,
   6                     const struct usb_device_id *id,
   7                     struct drm_driver *driver)
   8 {
   9         struct drm_device *dev;
  10         struct usb_device *usbdev;
  11         int ret;
  12
  13         DRM_DEBUG("\n");
  14
  15         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
  16         if (!dev)
  17                 return -ENOMEM;
  18
  19         usbdev = interface_to_usbdev(interface);
  20         dev->usbdev = usbdev;
  21         dev->dev = &usbdev->dev;
  22
  23         mutex_lock(&drm_global_mutex);
  24
  25         ret = drm_fill_in_dev(dev, NULL, driver);
  26         if (ret) {
  27                 printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
  28                 goto err_g1;
  29         }
  30
  31         usb_set_intfdata(interface, dev);
  32         ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
  33         if (ret)
  34                 goto err_g1;
  35
  36         ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY);
  37         if (ret)
  38                 goto err_g2;
  39
  40         if (dev->driver->load) {
  41                 ret = dev->driver->load(dev, 0);
  42                 if (ret)
  43                         goto err_g3;
  44         }
  45
  46         /* setup the grouping for the legacy output */
  47         ret = drm_mode_group_init_legacy_group(dev,
  48                                                &dev->primary->mode_group);
  49         if (ret)
  50                 goto err_g3;
  51
  52         list_add_tail(&dev->driver_item, &driver->device_list);
  53
  54         mutex_unlock(&drm_global_mutex);
  55
  56         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
  57                  driver->name, driver->major, driver->minor, driver->patchlevel,
  58                  driver->date, dev->primary->index);
  59
  60         return 0;
  61
  62 err_g3:
  63         drm_put_minor(&dev->primary);
  64 err_g2:
  65         drm_put_minor(&dev->control);
  66 err_g1:
  67         kfree(dev);
  68         mutex_unlock(&drm_global_mutex);
  69         return ret;
  70
  71 }
  72 EXPORT_SYMBOL(drm_get_usb_dev);
  73
  74 static int drm_usb_get_irq(struct drm_device *dev)
  75 {
  76         return 0;
  77 }
  78
  79 static const char *drm_usb_get_name(struct drm_device *dev)
  80 {
  81         return "USB";
  82 }
  83
  84 static int drm_usb_set_busid(struct drm_device *dev,
  85                                struct drm_master *master)
  86 {
  87         return 0;
  88 }
  89
  90 static struct drm_bus drm_usb_bus = {
  91         .bus_type = DRIVER_BUS_USB,
  92         .get_irq = drm_usb_get_irq,
  93         .get_name = drm_usb_get_name,
  94         .set_busid = drm_usb_set_busid,
  95 };
  96
  97 int drm_usb_init(struct drm_driver *driver, struct usb_driver *udriver)
  98 {
  99         int res;
 100         DRM_DEBUG("\n");
 101
 102         INIT_LIST_HEAD(&driver->device_list);
 103         driver->kdriver.usb = udriver;
 104         driver->bus = &drm_usb_bus;
 105
 106         res = usb_register(udriver);
 107         return res;
 108 }
 109 EXPORT_SYMBOL(drm_usb_init);
 110
 111 void drm_usb_exit(struct drm_driver *driver,
 112                   struct usb_driver *udriver)
 113 {
 114         usb_deregister(udriver);
 115 }
 116 EXPORT_SYMBOL(drm_usb_exit);
 117
 118 MODULE_AUTHOR("David Airlie");
 119 MODULE_DESCRIPTION("USB DRM support");
 120 MODULE_LICENSE("GPL and additional rights");